Comprehensive support for measuring sound power of household electrical appliance

Abstract

The invention relates to a comprehensive support for sound power measurement of household appliances. The comprehensive support comprises a main body frame, two first adjustable measurement array supports, two second adjustable measurement array supports, a mobile center support, a laser indicator, a laser ranging sensor and a multi-directional laser indicator group. According to the invention, through a double-lead screw group and a single-motor synchronous driving design with a lead ratio of 2: 1, nine measuring points are synchronously controlled to ascend and descend by starting and stopping a single motor, and point-by-point adjustment is not needed; a long waist-shaped groove and an electric push rod are adopted to prevent the measuring rod from drooping and ensure that the end face of the pickup is horizontal; the laser distance measuring sensor is offset by 50mm to compensate the mechanical interference of the mounting seat and ensure the central positioning of the sound measuring sensor; based on a laser collaborative calibration system, a vertical laser beam is used as a unified height reference, and a laser indicator of an adjustable bracket is linked; the horizontal laser beams calibrate the projection positions of the ABCD points, avoiding points are automatically generated through coordinate mapping, and the space consistency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of household appliance sound power measuring equipment, and more particularly to a comprehensive bracket for measuring the sound power of household appliances. Background Art

[0002] According to the national standard "GB / T 4214.1-2017," the sound power level of household appliances must be measured in a semi-anechoic chamber using a rectangular hexahedron measurement array (9 or 6 points) or a hemispherical envelope measurement array. The standard requires that the measurement points must be located 1 meter from the surface of the device under test, precisely distributed around the perimeter and top of the device (9 points, including the four corners, the centers of the four sides, and the center of the top). The height of the measurement points must dynamically adapt to the different sizes of household appliances (such as washing machines and air conditioner outdoor units), typically ranging from 700 to 1300 mm.

[0003] The current sound power measurement bracket has the following problems:

[0004] 1. Low efficiency of manual adjustment: Traditional brackets rely on manual adjustment of the measuring rod position, which requires repeated positioning of each measuring point. A single experiment takes up to 1-2 hours and is prone to human error.

[0005] 2. Difficulty in synchronous positioning of multiple measuring points: The 9-point matrix of the rectangular hexahedron requires synchronous adjustment of the measuring points on the four sides and the top surface. The lack of mechanical linkage design leads to poor spatial consistency of the measuring points.

[0006] 3. Interference between the measuring rod and the pickup: When measuring a hemispherical array, the installation position of the pickup at the end of the measuring rod must strictly meet the standard spherical center distance requirements. The existing bracket lacks a radial offset design, which can easily lead to acoustic measurement deviations.

[0007] Therefore, how to provide a comprehensive bracket that can achieve rapid and automatic positioning of multiple measuring points, reduce manual intervention; accurately compensate for the installation position of the pickup to meet the standard spherical center distance requirements; and be compatible with the switching needs of rectangular arrays and hemispherical arrays is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0008] To this end, the purpose of the present invention is to provide a comprehensive bracket for measuring the sound power of household appliances, which solves the problems existing in the existing sound power measurement brackets one by one.

[0009] The technical solution of the present invention is a comprehensive bracket for measuring the sound power of household appliances, comprising:

[0010] The main frame is a rectangular parallelepiped frame structure;

[0011] Two first adjustable measurement array brackets are embedded in the longitudinal side surfaces of the main frame, and at least some of their components are capable of relative movement relative to the corresponding top beam or bottom beam of the main frame; each first adjustable measurement array bracket includes two sets of vertically arranged X-guide lead screws, and the lead ratio of the first X-guide lead screw to the second X-guide lead screw is 2:1; the first X-guide lead screw and the second X-guide lead screw are both equipped with laser pointers and are synchronously driven by a first motor; and are used to measure measurement points within the array plane along the length of the array body;

[0012] Two second adjustable measurement array brackets are embedded in the two side surfaces of the main frame in the width direction, and at least some of their components are able to move relative to the corresponding top beam or bottom beam of the main frame; each second adjustable measurement array bracket includes two sets of vertically arranged Y-guide lead screws, and the lead ratio of the first Y-guide lead screw to the second Y-guide lead screw is 2:1; the first Y-guide lead screw and the second Y-lead lead screw are both equipped with laser pointers and are synchronously driven by a second motor; they are used to measure measuring points within the array plane along the width direction of the array body;

[0013] The movable center bracket is embedded in the top of the main frame, and at least part of its components can move relative to the top crossbeam corresponding to the main frame. A laser ranging sensor and a multi-directional laser pointer group are integrated on it, which are used to measure the measuring point in the middle of the array; the laser pointer, laser ranging sensor and multi-directional laser pointer group, together with the measuring point positioning crossbar of the X-guide lead screw group and the measuring point positioning crossbar of the Y-guide lead screw group, constitute a spatial coordinate collaborative calibration system.

[0014] According to the integrated bracket of the present invention, the top of each of the first adjustable measuring array brackets and each of the second adjustable measuring array brackets is connected to the top of the main frame through a slider guide rail group, and the bottoms thereof are in rolling contact with the slide on the bottom cross beam of the main frame through a roller group. The first adjustable measuring array bracket and the second adjustable measuring array bracket are both pushed and pulled by corresponding electric push rods and maintained within their respective planar motion ranges.

[0015] According to the integrated bracket of the present invention, each of the first adjustable measurement array brackets further comprises:

[0016] A first measuring frame body, the first motor being fixed to the top thereof and synchronously driving the first X-guide lead screw and the second X-guide lead screw to rotate via a synchronous pulley; the first X-guide lead screw and the second X-guide lead screw being symmetrically and parallelly arranged on both sides of the first measuring frame body;

[0017] The X-axis length measurement point positioning crossbar is vertically mounted on the first X-axis guide screw through the first X-axis screw nut and is located outside the first measurement frame body. Both ends of the crossbar are movably connected to laser pointers, which move along the Z direction outward of the array body following the first X-axis screw nut and are used for measuring two measuring points above the array surface along the length direction of the hexahedron array;

[0018] The X-direction short measurement point positioning crossbar is vertically installed on the second X-direction guide screw through the second X-direction screw nut and is located inside the first measuring frame body. A laser pointer is installed in the middle of it, which moves inward along the Z direction of the array body following the second X-direction screw nut, and is used to measure a measuring point at the center of the array surface along the length direction of the array body.

[0019] According to the integrated bracket of the present invention, both ends of the X-axis long measurement point positioning cross bar have long waist-shaped grooves, and corresponding laser indicators are installed with clamps. The end of each clamp slides along the corresponding long waist-shaped groove through an electric push rod to change the position of the measuring point in the length direction of the array; the length of the X-axis short measurement point positioning cross bar is less than the length of the first measurement frame body, and also less than the length of the X-axis long measurement point positioning cross bar.

[0020] According to the integrated bracket of the present invention, each of the second adjustable measurement array brackets further comprises:

[0021] A second measuring frame body, the second motor is fixed to the top of the second measuring frame body, and synchronously drives the first Y-guide lead screw and the second Y-guide lead screw to rotate through a synchronous pulley; the first Y-guide lead screw and the second Y-guide lead screw are symmetrical and parallel to each other on both sides of the second measuring frame body;

[0022] The two Y-axis measuring point positioning cross bars are connected by Y-axis lead screw nuts. One of them is vertically installed on the first Y-axis guide screw and is located on the outside of the second measuring frame body. There is a laser indicator in the middle, which moves along the Z direction outward of the array body following the corresponding Y-axis lead screw nut; the other one is vertically installed on the second Y-axis guide screw and is located on the inside of the second measuring frame body. A clamp and a laser indicator are installed in the middle, which moves along the Z direction inward of the array body following the corresponding Y-axis lead screw nut.

[0023] According to the integrated bracket of the present invention, when the second motor simultaneously drives the first Y-guide lead screw and the second Y-guide lead screw to rotate the same number of turns, the axial displacements of the Y-direction lead screw nuts installed on the first Y-guide lead screw and the second Y-guide lead screw are exactly in a multiple relationship. When the Y-direction measuring point positioning crossbar connected to the Y-direction lead screw nut of the first Y-direction lead screw is raised to the same height as the X-direction long measurement point positioning crossbar, the Y-direction measuring point positioning crossbar connected to the Y-direction lead screw nut of the second Y-direction lead screw is consistent in height with the X-direction short measurement point positioning crossbar, thereby realizing one measuring point within the array surface of the 9-point matrix and the 6-point matrix of the rectangular hexahedron measurement array along the width direction of the array body; the Y-direction measuring point positioning crossbar corresponding to the first Y-direction lead screw is only used for indication and convenient adjustment of the position of one measuring point within the array surface in the width direction of the array body.

[0024] According to the integrated bracket of the present invention, the mobile center bracket further comprises:

[0025] Mobile frame body;

[0026] Two rack guide rails are arranged perpendicular to the mobile frame body to form an I-shaped structure, and are respectively installed on the four corresponding square tube longitudinal beams on the left and right sides along the length direction of the main frame, and are supported and fixed by the connecting plates on each square tube longitudinal beam;

[0027] Y-direction drive mechanism realizes Y-direction movement along two rack guide rails;

[0028] The X-direction driving mechanism realizes X-direction movement along the movable frame body and drives the laser ranging sensor and the multi-directional laser indicator group to perform precise displacement.

[0029] According to the integrated bracket of the present invention, the Y-direction driving mechanism uses a Y-direction stepping motor, which is decelerated by a precision reducer and a synchronous pulley, to drive a driving shaft that runs across the X-direction to rotate. A driving wheel is fixed at each end of the driving shaft. Under the drive of the Y-direction stepping motor, the movable bracket body moves in the Y direction along two rack guide rails.

[0030] The X-direction drive mechanism is suspended below the mobile frame body and adopts an X-direction stepper motor, a linear rolling guide and a ball screw nut pair mechanism; the X-direction stepper motor drives the linear rolling guide and the ball screw nut pair mechanism to make the slide perform precise displacement along the X-direction. The laser ranging sensor and the multi-directional laser indicator group are connected to the bottom of the slide via three-section electric push rods; the Y-direction stepper motor and the X-direction stepper motor are controlled to move simultaneously, so that the three-section electric push rods carry the laser ranging sensor and the multi-directional laser indicator group to perform precise displacement.

[0031] According to the integrated bracket of the present invention, travel switches are installed at both ends of each rack guide rail.

[0032] According to the integrated bracket of the present invention, a mounting seat is installed at the end of the three-section electric push rod, and a laser ranging sensor is installed offset below the mounting seat; there are two horizontal position indicating lasers in each of the four directions flush with the laser outlet of the laser ranging sensor; a vertical center position vertical indicating laser is installed at the center of each of the four sides of the mounting seat; the center position of the mounting seat is a sound measuring mounting seat for installing a sound measuring sensor with a rectangular hexahedron measurement array located at the center position of the top surface.

[0033] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The traditional manual adjustment of the measuring rod takes 1-2 hours and has a high error rate.

[0035] The solution of the present invention is to use a single motor synchronous drive design with a dual-lead screw assembly (lead ratio of 2:1). The 10mm lead screw drives the measuring points at both ends of the long crossbar, and the 5mm lead screw drives the center measuring point. The corresponding motor starts and stops synchronously to control the raising and lowering of nine measuring points in a single start and stop, eliminating the need for point-by-point adjustment. The single measurement time is shortened from 1-2 hours to ≤10 minutes, reducing manual intervention by 90%.

[0036] 2. The spatial consistency of traditional defect measurement points is poor, making it difficult to meet the GB / T 4214.1-2017 standard.

[0037] The present invention realizes precise positioning of measuring points through a laser collaborative calibration system, which is described in conjunction with the steps of the specific embodiment:

[0038] (1) Using the vertical laser beam as a unified height reference (steps 8 / 10), the electric push rods on the four-sided adjustable bracket are linked to make the laser point of the four-sided adjustable bracket coincide with the center laser line (step 10);

[0039] (2) Use a horizontal laser beam to calibrate points ABCD (1 m from the corner of the instrument, step 11), and automatically generate avoidance points (EFGH) through coordinate mapping;

[0040] (3) Based on the dual laser alignment mechanism (steps 10 / 16), the spatial positions of the nine measuring points are adjusted, and the short arm laser point is vertically aligned with the center laser line (step 10); the long / short arm measuring points are raised horizontally to the height of the transverse laser line (step 16);

[0041] (4) The final result is that the position deviation of the 9-point matrix is ​​≤±2mm (standard tolerance ±5mm), and the spatial consistency is greatly improved.

[0042] 3. Traditional defects: Deviation of the pickup installation position leads to failure of acoustic measurement.

[0043] The solution of the present invention adopts the dual insurance of mechanical anti-interference and laser precise positioning. It adopts long waist-shaped groove and electric push rod to prevent the measuring rod from sagging and ensure the level of the pickup end face; the laser ranging sensor is offset by 50mm relative to the axis of the three-section electric push rod to compensate for the mechanical interference of the mounting base and ensure the center positioning of the sound sensor; the radial offset design of the hemispherical array meets the standard sphere center distance requirements, and the sphere center distance error is ≤±1.5mm (the standard requirement is ≤±2mm). BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0045] Figure 1 A schematic structural diagram of the integrated support for measuring sound power of household appliances provided by the present invention;

[0046] Figure 2 The structural diagram of the main frame is shown;

[0047] Figure 3 The schematic diagram of the structure of the first adjustable measurement array bracket is shown;

[0048] Figure 4 The diagram shows the long waist-shaped groove on one side of the crossbar for positioning the X-axis long measurement point.

[0049] Figure 5 The diagram shows the electric push rod on the other side of the X-axis length measurement point positioning crossbar;

[0050] Figure 6 The schematic diagram of the structure of the second adjustable measurement array bracket is shown;

[0051] Figure 7 The schematic diagram of the structure of the mobile center support is shown;

[0052] Figure 8 A schematic diagram showing the support of the rack guide rail through the connecting plate on the square tube longitudinal beam is shown;

[0053] Figure 9 The schematic diagram of the structure of the Y-direction driving mechanism of the mobile center support is shown;

[0054] Figure 10 The schematic diagram of the X-direction driving mechanism of the mobile center support is shown;

[0055] Figure 11 The figure shows the installation diagram of the mounting base, laser rangefinder sensor and multi-directional laser pointer group;

[0056] Figure 12 The standard nine-point cube diagram is shown. DETAILED DESCRIPTION

[0057] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0058] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0059] The current sound power measurement bracket has low manual adjustment efficiency, difficulty in synchronous positioning of multiple measuring points, and the installation position of the pickup at the end of the measuring rod must strictly meet the standard spherical center distance requirements when measuring hemispherical arrays. The existing bracket lacks a radial offset design, which can easily lead to acoustic measurement deviations.

[0060] In view of this, the technical solution of the present invention provides a comprehensive bracket for measuring the sound power of household appliances, see the attached Figure 1-11 It includes a main frame 1, two first adjustable measuring array brackets 2, two second adjustable measuring array brackets 3, a mobile center bracket 5, a laser pointer 4, a laser ranging sensor and a multi-directional laser pointer group 6, etc.

[0061] The main frame 1 is a rectangular frame structure; the main frames of the present invention are all welded with 304 stainless steel square tubes, angle steels and other profiles and plates. The outer surfaces of the remaining fixed parts except the moving parts are wrapped with a sponge layer to prevent sound reflections from the frame surface from interfering with the test.

[0062] Two first adjustable measurement array brackets 2 are located in the semi-anechoic chamber in the north-south (X-direction) direction, embedded in the longitudinal side surfaces of the main frame 1. At least some of their components are movable relative to the corresponding top crossbeam 11 or bottom crossbeam 12 of the main frame 1. Each first adjustable measurement array bracket 2 includes two vertically arranged X-guide screws, with the lead ratio of the first X-guide screw 22 to the second X-guide screw 23 being 2:1. Both the first X-guide screw 22 and the second X-guide screw 23 are equipped with a laser pointer 4 and are synchronously driven by a first motor 21. The leads of the two screws are multiples of each other, 10 mm and 5 mm, respectively. Therefore, when the first motor 21 simultaneously drives the two screws for the same number of revolutions, the axial displacement of the nuts mounted on the two screws is exactly multiples. The first adjustable measurement array bracket 2 is designed to achieve three measurement points within the array plane along the length of the rectangular hexahedron measurement array (9-point array, 6-point array).

[0063] The 6-point array omits the four corner measurement points and only retains the four side centers and the top surface center.

[0064] The two second adjustable measurement array brackets 3 are located in the east-west direction (Y direction) in the semi-anechoic chamber, embedded in the two side surfaces in the width direction of the main frame 1, and at least some parts can move relative to the corresponding top beam 11 or bottom beam 12 of the main frame 1; each of the second adjustable measurement array brackets 3 includes two groups of vertically arranged Y-guide lead screw groups, and the lead ratio of the first Y-guide lead screw 32 (10mm lead) and the second Y-lead lead screw 33 (5mm lead) is 2:1; the first Y-guide lead screw 32 and the second Y-lead lead screw 33 are both equipped with a laser pointer 4, and are synchronously driven by a second motor 31; they are used to realize one measuring point within the array surface of the hexahedral measurement array (9-point array, 6-point array) along the width direction of the array body.

[0065] The mobile center bracket 5 is embedded in the top of the main frame 1, and at least part of its parts can move relative to the top crossbeam 11 corresponding to the main frame 1. A laser ranging sensor and a multi-directional laser indicator group 6 are integrated thereon for measuring the measuring point in the middle of the array; the laser indicator 4, the laser ranging sensor and the multi-directional laser indicator group 6, together with the measuring point positioning crossbar of the X-guide lead screw group and the measuring point positioning crossbar of the Y-guide lead screw group constitute a spatial coordinate collaborative calibration system, and the acoustic sensor 61 is installed below the laser ranging sensor and the multi-directional laser indicator group 6.

[0066] See attached Figure 3 and 6The top of each first adjustable measuring array bracket 2 and each second adjustable measuring array bracket 3 is connected to the top of the main frame 1 through a slider guide rail group, and the bottom thereof is in rolling contact with the slide on the bottom cross beam 12 of the main frame 1 through a roller group. The first adjustable measuring array bracket 2 and the second adjustable measuring array bracket 3 are pushed and pulled by the corresponding electric push rod 7 and maintained within their respective planar motion ranges.

[0067] Both first adjustable measurement array supports 2 are equipped with rollers at their bases, and a guide groove is located beneath the upper frame square tube. An electric push rod is installed on the side of the first adjustable measurement array support 2 near the ground. This push rod can push the first adjustable measurement array support 2 along the guide groove within a certain range to align the center position of the measured household appliance along the length of the array. The top and bottom structures of the second adjustable measurement array support 3 are basically the same as those of the first adjustable measurement array support 2.

[0068] See attached Figure 3-5 , each of the first adjustable measurement array brackets 2 further includes:

[0069] The first measuring frame body has a first motor 21 fixed on its top, which drives the first X-guide lead screw 22 (10 mm) and the second X-guide lead screw 23 (5 mm) to rotate synchronously through a synchronous pulley; the first X-guide lead screw 22 and the second X-guide lead screw 23 are symmetrical and parallel to each other on both sides of the first measuring frame body;

[0070] The X-axis length measurement point positioning crossbar 24 is vertically mounted on the first X-axis guide screw 22 through the first X-axis screw nut and is located outside the first measurement frame body. Both ends of the crossbar are movably connected to the laser pointer 4, which moves along the Z direction outward of the array body with the first X-axis screw nut and is used for measuring two measuring points above the array surface along the length direction of the array body of the hexahedron measurement array;

[0071] The X-direction short measurement point positioning crossbar 25 is vertically mounted on the second X-direction guide screw 23 through the second X-direction screw nut and is located inside the first measuring frame body. A laser indicator 4 is installed in the middle of it, which moves inward along the Z direction of the array body following the second X-direction screw nut, and is used to measure a measuring point at the center of the array surface along the length direction of the array body.

[0072] See attached Figure 4 and 5 Both ends of the X-direction long measurement point positioning crossbar 24 have long waist-shaped grooves 241, and the corresponding laser pointers 4 are equipped with clamps 41. The end of each clamp 41 slides along the corresponding long waist-shaped groove 241 through an electric push rod 242 to change the measuring point position in the length direction of the array; the length of the X-direction short measurement point positioning crossbar 25 is less than the length of the first measurement frame body, and also less than the length of the X-direction long measurement point positioning crossbar 24.

[0073] The clamp and laser pointer assembly is retracted and extended by an electric push rod mounted on the back of the angle steel, enabling measurement of two points along the length of the hexahedron measurement array (9-point array, 6-point array). A guide mechanism on the quick clamp and laser pointer assembly fits into a long, waist-shaped slot in the angle steel to prevent the assembly from sagging or tilting.

[0074] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0075] See attached Figure 6 Each of the second adjustable measurement array brackets 3 further includes:

[0076] The second measuring frame body has a second motor 31 fixed on its top, which drives the first Y-guide lead screw 32 and the second Y-guide lead screw 33 to rotate synchronously through a synchronous pulley; the first Y-guide lead screw 32 and the second Y-guide lead screw 33 are symmetrical and parallel to each other on both sides of the second measuring frame body;

[0077] The two Y-direction measuring point positioning cross bars 34 are both connected by Y-direction lead screw nuts. One of them is correspondingly installed vertically on the first Y-direction guide lead screw 32 and is located on the outside of the second measuring frame body. There is a laser indicator 4 in the middle, which moves along the Z direction outward of the array body following the corresponding Y-direction lead screw nut; the other one is correspondingly installed vertically on the second Y-direction guide lead screw 33 and is located on the inside of the second measuring frame body. There is a clamp and a laser indicator 4 in the middle, which moves along the Z direction inward of the array body following the corresponding Y-direction lead screw nut.

[0078] Advantageously, when the second motor 31 simultaneously drives the first Y-guide lead screw 32 and the second Y-guide lead screw 33 to rotate the same number of turns, the axial displacements of the Y-direction lead screw nuts installed on the first Y-direction lead screw 32 and the second Y-direction lead screw 33 are exactly in a multiple relationship. When the Y-direction measuring point positioning crossbar 34 connected to the Y-direction lead screw nut of the first Y-direction lead screw 32 is raised to the same height as the X-direction long measurement point positioning crossbar 24, the Y-direction measuring point positioning crossbar 34 connected to the Y-direction lead screw nut of the second Y-direction lead screw 33 is consistent in height with the X-direction short measurement point positioning crossbar 25, thereby realizing one measuring point within the array surface of the rectangular hexahedron 9-point array and the 6-point array along the width direction of the array body; the Y-direction measuring point positioning crossbar 34 corresponding to the first Y-direction lead screw 32 is only used for indication and convenient adjustment of the position of one measuring point within the array surface in the width direction of the array body.

[0079] See attached Figure 7 and 8 The mobile center support 5 is located on the upper part of the main frame and is an I-shaped structure. It is equivalent to a light XY bidirectional CNC crane. It also includes: a mobile frame body 50;

[0080] Two rack guide rails 51 are arranged perpendicular to the mobile frame body 50 to form an I-shaped structure, and are respectively installed on the four corresponding square tube longitudinal beams 13 on the left and right sides along the length direction of the main frame 1, and are supported and fixed by the connecting plates 14 on each square tube longitudinal beam 13;

[0081] The Y-direction driving mechanism 52 realizes Y-direction movement along the two rack guide rails 51;

[0082] The X-direction driving mechanism 53 realizes X-direction movement along the movable frame body 50 and drives the laser ranging sensor and the multi-directional laser pointer group 6 to make precise displacement;

[0083] When the hexahedron array is not used for measurement, the movable frame body 50 is completely retracted to one end of the main frame 1 to leave enough space for the hemispherical array six-claw bracket to take off and land.

[0084] See attached Figure 9 The Y-direction driving mechanism 52 uses a Y-direction stepping motor 521 to drive a driving shaft 523 that runs across the X-direction after being decelerated by a precision reducer and a synchronous pulley. A driving wheel 522 is fixed at each end of the driving shaft 523. Under the drive of the Y-direction stepping motor 521, the movable frame body moves in the Y-direction along the two rack guide rails 51.

[0085] See attached Figure 10The X-direction driving mechanism 53 is suspended below the movable frame body and adopts an X-direction stepping motor 531, a linear rolling guide and a ball screw nut pair mechanism 532; the X-direction stepping motor 531 drives the linear rolling guide and the ball screw nut pair mechanism 532 to make the slide 533 perform precise displacement along the X-direction, and the laser ranging sensor and the multi-directional laser indicator group 6 are connected to the slide 533 through a three-section electric push rod 534 below; the Y-direction stepping motor 521 and the X-direction stepping motor 531 are controlled to move simultaneously, so that the three-section electric push rod 534 carries the laser ranging sensor and the multi-directional laser indicator group 6 to perform precise displacement.

[0086] Advantageously, each of the rack guide rails 51 is provided with a travel switch 511 at both ends. When the maximum travel of the system's moving parts is exceeded, these four travel switches are triggered, thereby immediately stopping the movement of the moving center frame, achieving over-travel protection and preventing the moving parts from falling or the motor from being blocked and damaged.

[0087] See attached Figure 11 A 3D-printed mounting base 65 is installed at the end of the three-section electric push rod 534, and a laser ranging sensor 62 is installed offset below the mounting base 65; there are two horizontal position indicating lasers 63 in each of the four directions flush with the laser outlet of the laser ranging sensor 62; at the center of each of the four sides of the mounting base 65, a vertical center position indicating laser 64 is installed; the center position of the mounting base 65 is a sound measuring mounting base for installing the sound measuring sensor 61 of the rectangular hexahedron measurement array located at the center of the top surface.

[0088] Regarding the pickups used in the bracket of the present invention, taking into account the pickup's length and orientation relative to the center of the hemispherical array, each quick-release clamp 41 (using the existing structure, all of the aforementioned clamps are used to mount the pickups) is offset by its radius relative to the vertical axis of the hemispherical array's center. This ensures that the horizontal, vertical, and radial distances between the end face of the pickup mounted at the end of the measuring rod and the center of the hemispherical array meet the standard requirements. Furthermore, the pickup's mounting position can be moved forward and backward along its axis and rotated about the axis of the mounting base at the end of the measuring rod for fine adjustment.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0090] The above technical solution of the present invention is realized by the overall control of the control system. It can be formed into a control cabinet, control box, etc. The input operation can be performed on the display interface to control the operation of each actuator.

[0091] It is important to note the position of the three-section push rod at the center of the rectangular hexahedron measuring frame. If it is not at the center of the entire rectangular hexahedron measuring frame (when using a hemispherical measuring array, the three-section push rod at the center and the upper bidirectional movable crossbeam must be moved to the end of the guide rail to prevent collision), the center frame of the measuring frame must be moved back to the center position and reset to zero before performing subsequent measurement operations on the rectangular hexahedron measuring frame.

[0092] See attached Figure 12 The distance measurement and movement control interface (one of the display interfaces) serves as the overall control interface for the integrated bracket of the present invention. After placing the appliance under test on the floor of the semi-anechoic chamber, the center of the appliance under test (in both the east-west and north-south directions) is measured. The positions of the measuring points, each 1 meter from each side of the appliance under test, are then determined as required. The positions of the measuring points are then adjusted by the movement of the motors and electric push rods on each side of the rectangular hexahedron measurement array. This interface displays the names of the various directions of the rectangular hexahedron measurement array, the name and direction of the coordinate system, and the locations of the four corner points A, B, C, and D, each 1 meter from each side of the appliance under test, to prevent operational errors.

[0093] Method of using rectangular hexahedron measurement array:

[0094] 1) Turn on the central laser ranging sensor so that its light spot shines on the laboratory floor;

[0095] 2) Use the manual function in the display interface to move the mobile center frame above the rectangular hexahedron measurement array to the center of the laboratory floor. The laser ranging sensor light spot (hereinafter referred to as the light spot) is shone near the center of the floor, and then returned to zero.

[0096] 3) Place the appliance under test at the center of the laboratory floor. The position should be approximately the same as the center point, with all sides as parallel as possible to the east, south, west and north walls of the laboratory.

[0097] 4) Adjust the position of the center moving frame in the display interface so that the laser ranging sensor's light spot is on one side of the device being measured. For example, in the X direction (north-south direction), it is located south of the device being measured, and in the other direction (Y direction or east-west direction), it is within the size range of the device being measured. Similarly, if the light spot is not in the same direction, it will be located south of the device being measured.

[0098] 5) Search for the center in one direction according to the position of the light spot relative to the device under test. Note that the direction of the stepper motor should be adjusted according to the position of the light spot relative to the device under test. After the search is completed, the light spot will automatically stop at half the width of the device under test in this direction.

[0099] 6) Manually move the center frame in the other direction on the display interface so that the light spot moves out of the device under test and shines on the ground;

[0100] 7) Search for the center in this direction according to the position of the light spot relative to the device under test (note that the direction of the motor should be adjusted according to the position of the light spot relative to the device under test). After the search is completed, the light spot will automatically stop. At this time, the axis of the three-section electric push rod of the mobile center frame is at the center of the device under test in the X and Y directions.

[0101] 8) Adjust the extension and retraction of the three electric push rods of the mobile center frame so that the center laser distance sensor reading displayed is 1000mm. At this point, the height of the highest measuring point of the rectangular hexahedron measurement array has been determined;

[0102] 9) Keep the mobile center frame in place and turn on the laser on the rectangular measurement frame in the "Hemispherical Measurement Array" interface (one of the display interfaces) to emit light spots and rays;

[0103] 10) By adjusting the horizontal electric push rods close to the ground in the east, west, south, and north frames of the rectangular hexahedron measurement array, the light spot of the laser on the short arm measuring rod of the four-sided adjustable measurement array bracket coincides with the vertical laser line emitted by the mobile center bracket. At this time, the vertical symmetry center of each long side and short side mobile bracket coincides with the center of the measured instrument;

[0104] 11) In the "Center Measuring Frame" interface (one of the display interfaces), click "Point A" or any other point (B, C, D). The mobile center frame will automatically move to that point. The point is 1m away from the two sides parallel to the X and Y directions of a corner point of the measured instrument (this value can be changed in the final parameter settings, generally set to 1000mm consistent with the standard).

[0105] 12) Remove a telescopic measuring rod, attach a pickup to its end, and install it in the quick-release clamp at the end of the electric push rod of the long-arm measuring rod in the adjustable bracket on the south or north side (depending on which of the four points A, B, C, or D is selected). Adjust its length so that the end of the pickup just covers the vertical laser beam emitted by the center moving center frame. Adjust the extension length of the piston rod of the electric push rod of the long-arm measuring rod in the adjustable bracket so that it aligns with the vertical laser beam emitted by the moving center frame.

[0106] 13) Install the telescopic measuring rod in the quick clamp at the end of the long-arm measuring rod electric push rod on the other side according to the same process;

[0107] 14) Install the two measuring rods at the end of the long arm measuring rod on the other side using the same process;

[0108] 15) Install the two measuring rods in the short arm measuring rod quick clamps at the lower middle position of the short side brackets on the east and west sides according to the same process;

[0109] 16) Turn on the screw lift motors for the measuring frames on each side of the frame (the screw motors in the "Rectangular Measuring Frame" interface). Raise the long-arm measuring rods on the north and south long sides until they are aligned with the horizontal laser line emitted by the mobile center frame. Raise the high-wall measuring rods on the east and west short sides until they are aligned with the horizontal laser line emitted by the mobile center frame. At this point, the positions of all measuring points have been adjusted.

[0110] 17) Press the emergency stop button on the control box or control cabinet to cut off the power to the entire control system, ensure that there is no additional electrical noise in the semi-anechoic room, and then start testing.

[0111] The present invention can measure the length, width and height range of products: according to the range of motion of the laser in the center of the rectangular hexahedron measuring frame, the maximum size of household appliances that can be measured by this measuring frame is: the east-west length can be 1600mm; the north-south length can be 800mm; the height can be 700-1300mm.

[0112] Regarding the avoidance point EFGH, the mounting base 65 of the mobile center bracket has a physical width in the X direction (approximately 90mm). If the measuring rod is positioned directly at the standard ABCD point (1m from the instrument corner), the mounting base will collide with the measuring rod. The EFGH point is generated by offsetting the ABCD point in the X direction by a fixed distance (90mm). This allows the measuring rod to be installed away from the mounting base's mechanical structure while maintaining the same Y coordinate. The 90mm offset is determined by the measured width of the mounting base and a safety margin. The pickup end face is calibrated using a vertical laser beam to ensure that its final spatial position coincides with the ABCD point (error ≤±2mm).

[0113] The following preparations are required for hemispherical envelope measurement array measurements:

[0114] Control the mobile center bracket 5 to retract to its X / Y limit position; remove the rectangular array measuring rod and install the hemispherical array six-claw bracket. Perform anti-interference calibration of the pickups, using the pickup mounting base to adjust the pickup position to meet the standard sphere center distance; verify the consistency of the horizontal distance between each measuring point and the sphere center using a horizontal laser beam. Disable the rectangular array laser indicator and enable the dedicated laser of the six-claw bracket; adjust the height of the three-section electric push rod 534 so that all pickup end faces are located on the same hemispherical surface. This invention is compatible with the switching requirements of rectangular and hemispherical arrays.

[0115] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0116] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. Comprehensive bracket for measuring sound power of household appliances, characterized by: include: The main frame (1) is a rectangular parallelepiped frame structure; Two first adjustable measurement array supports (2) are embedded in the two side surfaces of the main frame (1) in the longitudinal direction, and at least part of the components can be relatively moved on the corresponding top crossbeam (11) or bottom crossbeam (12) of the main frame (1); each of the first adjustable measurement array supports (2) includes two groups of vertically arranged X-guide lead screw groups, and the lead ratio of the first X-guide lead screw (22) to the second X-guide lead screw (23) is 2:1; the first X-guide lead screw (22) and the second X-guide lead screw (23) are both equipped with laser pointers (4) and are synchronously driven by a first motor (21); and are used for measuring measuring points within the array surface along the longitudinal direction of the array body; Two second adjustable measurement array brackets (3) are embedded in the two side surfaces of the main frame (1) in the width direction, and at least part of the components can be relatively moved with respect to the corresponding top crossbeam (11) or bottom crossbeam (12) of the main frame (1); each second adjustable measurement array bracket (3) includes two groups of vertically arranged Y-direction guide screw groups, and the lead ratio of the first Y-direction guide screw (32) to the second Y-direction guide screw (33) is 2:1; the first Y-direction guide screw (32) and the second Y-direction guide screw (33) are both equipped with laser pointers (4) and are synchronously driven by a second motor (31); and are used for measuring measuring points within the array surface along the width direction of the array body; A movable central support (5) is embedded in the top of the main frame (1), and at least part of the components can be relatively moved on the top crossbeam (11) corresponding to the main frame (1). A laser distance sensor and a multi-directional laser pointer group (6) are integrated on the movable central support for measuring the measuring point in the middle of the array. The laser pointer (4), the laser distance sensor and the multi-directional laser pointer group (6), together with the measuring point positioning crossbar of the X-guide lead screw group and the measuring point positioning crossbar of the Y-guide lead screw group, form a spatial coordinate collaborative calibration system.

2. The integrated bracket for measuring the sound power of household appliances according to claim 1, characterized in that: The top of each first adjustable measurement array bracket (2) and each second adjustable measurement array bracket (3) is connected to the top of the main frame (1) through a slider guide rail group, and the bottom thereof is in rolling contact with a slideway on a bottom crossbeam (12) of the main frame (1) through a roller group. The first adjustable measurement array bracket (2) and the second adjustable measurement array bracket (3) are pushed and pulled by corresponding electric push rods (7) to maintain them within their respective planar motion ranges.

3. The integrated bracket for measuring the sound power of household appliances according to claim 1, characterized in that: Each of the first adjustable measurement array supports (2) further comprises: A first measuring frame body, the first motor (21) is fixed to the top thereof, and synchronously drives the first X-guide lead screw (22) and the second X-guide lead screw (23) to rotate via a synchronous pulley; the first X-guide lead screw (22) and the second X-guide lead screw (23) are symmetrically and parallelly arranged on both sides of the first measuring frame body; An X-direction length measurement point positioning crossbar (24) is vertically mounted on the first X-direction guide screw (22) through a first X-direction screw nut and is located outside the first measurement frame body. Both ends of the crossbar are movably connected to laser indicators (4), which follow the first X-direction screw nut and move outward along the Z direction of the array body, and are used for measuring two measurement points above the array surface along the length direction of the array body of the hexahedron measurement array; An X-direction short measurement point positioning crossbar (25) is vertically mounted on a second X-direction guide screw (23) through a second X-direction screw nut and is located inside the first measurement frame body. A laser pointer (4) is mounted in the center thereof and moves along the Z direction inside the array body following the second X-direction screw nut for measuring a measurement point at the center of the array surface along the length direction of the array body.

4. The integrated bracket for measuring the sound power of household appliances according to claim 3, characterized in that: Both ends of the X-direction long measurement point positioning crossbar (24) are provided with long waist-shaped grooves (241), and corresponding laser indicators (4) are each installed with a clamp (41). The end of each clamp (41) slides along the corresponding long waist-shaped groove (241) through an electric push rod (242) to change the position of the measurement point in the length direction of the array body; the length of the X-direction short measurement point positioning crossbar (25) is less than the length of the first measurement frame body, and is also less than the length of the X-direction long measurement point positioning crossbar (24).

5. The integrated bracket for measuring the sound power of household appliances according to claim 3, characterized in that: Each of the second adjustable measurement array supports (3) further comprises: A second measuring frame body, the second motor (31) is fixed on the top thereof, and synchronously drives the first Y-guide lead screw (32) and the second Y-guide lead screw (33) to rotate through a synchronous pulley; the first Y-guide lead screw (32) and the second Y-guide lead screw (33) are symmetrically and parallelly arranged on both sides of the second measuring frame body; Two Y-direction measuring point positioning cross bars (34) are connected by Y-direction lead screw nuts, one of which is correspondingly mounted vertically on the first Y-direction guide lead screw (32) and located outside the second measuring frame body, and has a laser indicator (4) in the middle, which moves along the Z direction outside of the array body following the corresponding Y-direction lead screw nut; the other is correspondingly mounted vertically on the second Y-direction guide lead screw (33) and located inside the second measuring frame body, and has a clamp and a laser indicator (4) in the middle, which moves along the Z direction inside of the array body following the corresponding Y-direction lead screw nut.

6. The integrated bracket for measuring the sound power of household appliances according to claim 5, characterized in that: When the second motor (31) simultaneously drives the first Y-direction guide screw (32) and the second Y-direction guide screw (33) to rotate the same number of turns, the axial displacements of the Y-direction guide screw nuts installed on the first Y-direction guide screw (32) and the second Y-direction guide screw (33) are exactly in a multiple relationship. When the Y-direction measuring point positioning crossbar (34) connected to the Y-direction guide screw nut of the first Y-direction guide screw (32) rises to the same height as the X-direction long measuring point positioning crossbar (24), the Y-direction measuring point positioning crossbar (34) connected to the Y-direction guide screw nut of the second Y-direction guide screw (33) is consistent in height with the X-direction short measuring point positioning crossbar (25), realizing one measuring point in the array plane of the rectangular hexahedron measurement array of 9 points and 6 points along the array body width direction; the Y-direction measuring point positioning crossbar (34) corresponding to the first Y-direction guide screw (32) is only used to indicate and facilitate the adjustment of one measuring point position in the array plane in the array body width direction.

7. The integrated bracket for measuring the sound power of household appliances according to claim 6, characterized in that: The mobile center support (5) also includes: Mobile frame body (50); Two rack guide rails (51) are arranged perpendicularly to the mobile frame body (50) to form an I-shaped structure, and are respectively installed on four corresponding square tube longitudinal beams (13) on the left and right sides along the length direction of the main frame (1), and are supported and fixed by connecting plates (14) on each square tube longitudinal beam (13); A Y-direction driving mechanism (52) realizes Y-direction movement along two rack guide rails (51); The X-direction driving mechanism (53) realizes X-direction movement along the movable frame body (50) and drives the laser distance measuring sensor and the multi-directional laser indicator group (6) to perform precise displacement.

8. The integrated bracket for measuring the sound power of household appliances according to claim 7, characterized in that: The Y-direction driving mechanism (52) uses a Y-direction stepping motor (521) to drive a driving shaft (523) that runs across the X-direction to rotate after being decelerated by a precision reducer and a synchronous pulley. A driving wheel (522) is fixed at each end of the driving shaft (523). Under the drive of the Y-direction stepping motor (521), the movable frame body moves in the Y-direction along the two rack guide rails (51). The X-direction driving mechanism (53) is suspended below the movable frame body and adopts an X-direction stepping motor (531), a linear rolling guide rail and a ball screw nut pair mechanism (532); the X-direction stepping motor (531) drives the linear rolling guide rail and the ball screw nut pair mechanism (532) to make the slide (533) move precisely along the X-direction, and the laser distance sensor and the multi-directional laser indicator group (6) are connected to the slide (533) through three-section electric push rods (534); the Y-direction stepping motor (521) and the X-direction stepping motor (531) are controlled to move simultaneously, so that the three-section electric push rods (534) carry the laser distance sensor and the multi-directional laser indicator group (6) to move precisely.

9. The integrated bracket for measuring the sound power of household appliances according to claim 7, characterized in that: A travel switch (511) is installed at both ends of each rack guide rail (51).

10. The integrated bracket for measuring the sound power of household appliances according to claim 8, characterized in that: The three-section electric push rod (534) is provided with a mounting seat (65) at the end thereof, and a laser distance sensor (62) is offset and installed below the mounting seat (65); two horizontal position indicating lasers (63) are provided in each of four directions flush with the laser outlet of the laser distance sensor (62); a vertical center position indicating laser (64) is provided at the center of each of the four sides of the mounting seat (65); the center position of the mounting seat (65) is used to install a sound measuring mounting seat for a sound measuring sensor (61) of a rectangular hexahedron measurement array located at the center position of the top surface.

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