A protective device for reducing particle size test noise

Abstract

The present invention provides a protective device for reducing particle size test noise, comprising a soundproof cover covering the outside of a particle size test device; a silencer arranged inside the soundproof cover for eliminating noise, the silencer comprising a plurality of detection resonators and an adjustable resonator; and an adjustment mechanism for adjusting the silencer frequency of the adjustable resonator; the detection resonator is used to detect the noise frequency in the soundproof cover; the adjustable resonator is provided with an adjustable bottleneck for adjusting its resonant frequency; the soundproof cover is used to soundproof the noise generated by the test, the detection resonator and the adjustable resonator are used to absorb the noise, the detection resonator is used to detect the frequency of the noise, and the adjustment block is used to drive a connecting plate to move, so as to adjust the silencer frequency of the adjustable resonator accordingly, so that all the adjustable resonators can play a silencer function and automatically adjust the silencer frequency without manual operation.

Description

Technical Field

[0001] The invention relates to noise protection, in particular to a protection device for reducing particle size test noise. Background Art

[0002] Currently, laser particle size testing involves activating an ultrasonic device directly on the laser particle size analyzer to homogenize the sample solution for testing. This generates considerable noise, which can harm the health of test personnel if they are exposed to this high-noise environment for extended periods. This necessitates interrupting the tester's operation or requiring a break or a replacement. This not only hinders long-term testing but also reduces test efficiency.

[0003] Chinese patent CN211872691U discloses a noise protection device, comprising a frame, a mounting slot formed in the middle of the frame surface, a plate disposed within the mounting slot, a reinforcement layer disposed on the plate surface, a sound insulation layer disposed on the reinforcement layer surface, a sound-absorbing panel fixedly connected to the surface of the sound insulation layer, sound-absorbing holes formed on the surface of the sound-absorbing panel, a dust screen fixedly connected to the surface of the sound-absorbing holes, a first mounting plate fixedly connected to the left and right ends of the frame via first fixing screws, and a first connecting plate fixedly connected to the upper and lower sides of the other end of the first mounting plate. This noise protection device facilitates installation of the plate through the mounting slot, improves the stability of the plate through the slot and the plate, provides sound insulation through the sound insulation panel, improves the sound absorption effect through the sound-absorbing panel and the sound absorption holes, and facilitates adjustment of the angles of the first and second mounting plates through a first rotating shaft, a second rotating shaft, and a rotating rod.

[0004] However, there are still some problems in this technical solution. In order to be able to operate the test equipment, an openable and closable lid structure needs to be set in the sound insulation device, which leads to limited sealing of the noise protection device. Some noise will be emitted from the gaps in the active parts, reducing the sound insulation effect. In addition, the sound-absorbing panels generally use materials such as sound-absorbing cotton that can absorb sound. This material converts sound energy into heat energy and other energy to achieve the effect of noise reduction. However, after working for a long time, the total amount of noise generated is large and the sound energy is large. If all of it is absorbed by the sound-absorbing material, it is easy for the sound-absorbing material to be overloaded and the sound reduction effect to be reduced. The above technical solution has not effectively solved these problems. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of the existing technology and provide a protective device for reducing particle size test noise. The noise generated by the test is soundproofed by setting a soundproof cover, and the noise is absorbed by a detection resonator and an adjustable resonator. The frequency of the noise is detected by setting a detection resonator, and the connecting plate is driven to move by an adjustment block to adjust the mute frequency of the adjustable resonator accordingly, so that all adjustable resonators can play a mute function and automatically adjust the mute frequency without manual operation.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A protective device for reducing particle size test noise, comprising:

[0008] A soundproof cover covering the outside of the particle size testing device, wherein the soundproof cover is provided with an openable and closable cover;

[0009] a muffler disposed inside the soundproof enclosure for eliminating noise, the muffler comprising a plurality of detection resonators and an adjustable resonator; and

[0010] an adjusting mechanism for adjusting the muffling frequency of the adjustable resonator;

[0011] The detection resonator is used to detect the noise frequency in the soundproof enclosure and eliminate the noise of a specific frequency, the noise elimination frequencies of the detection resonators are different from each other, and the detection resonator is movably installed inside the soundproof enclosure; and

[0012] The adjustable resonator is provided with an adjustable bottleneck for adjusting its resonance frequency, and the adjustment mechanism is used to adjust the adjustable bottleneck.

[0013] Specifically, the particle size testing device can be a laser particle size tester, which is provided with an ultrasonic device for mixing the solution evenly. The main material of the sound insulation cover and the cover is sound insulation cotton;

[0014] By setting up a soundproof cover with sound insulation effect, the noise generated by the test is greatly reduced, the test can be carried out for a long time, the test efficiency is improved, and the damage caused by noise to the experimenter is reduced. By setting an openable and closable cover on the soundproof cover, it is convenient to place the sample.

[0015] Both the detection resonator and the adjustable resonator adopt Helmholtz resonators. In the Helmholtz resonator, the longer the bottleneck length is, the lower the resonant frequency of the resonator is, and correspondingly, the lower the sound absorption frequency of the resonator is.

[0016] In addition, since the sound waves passing through the resonance chamber in the bottleneck will be reflected and reversed, thereby canceling out the original sound waves, the noise can be further reduced, reducing the workload of the sound insulation cotton and the noise escaping from the sound insulation cover.

[0017] As another preferred embodiment, the detection resonator may include:

[0018] A movable resonance chamber movably mounted on the inner top wall of the soundproof enclosure; and

[0019] A fixed bottleneck communicated with the movable resonance chamber.

[0020] Specifically, a mounting base is provided on the inner top wall of the soundproof cover, and the movable resonance chamber is movably installed in the mounting base. When the noise frequency generated by the instrument is consistent with the resonance frequency of the movable resonance chamber, the air in the movable resonance chamber vibrates violently, thereby driving the movable resonance chamber to vibrate continuously.

[0021] As another preferred embodiment, the adjustable resonator includes:

[0022] A fixed resonance chamber fixedly mounted on the top wall of the soundproof enclosure; and

[0023] An adjustable bottleneck is connected to the fixed resonance chamber, and the adjustable bottleneck is a telescopic structure with adjustable length.

[0024] Specifically, the fixed resonance chamber is fixedly installed in the mounting base. By adjusting the length of the adjustable bottleneck, the resonant frequency of the adjustable resonator can be adjusted. After the frequency of the noise generated by the instrument changes, the resonant frequency of the adjustable resonator changes accordingly, thereby realizing the function of full silencing of the noise with changing frequency.

[0025] As another preferred embodiment, the adjustment mechanism includes:

[0026] A connecting plate connecting the adjustable bottlenecks together; and

[0027] An adjustment block for adjusting the height of the connecting plate is movably installed inside the sound insulation cover, the position of the adjustment block matches the position of the detection resonator, and the detection resonator is used to control the movement of the adjustment block.

[0028] Specifically, the adjustment block can only move in the X-axis direction; by setting multiple detection resonators with different resonant frequencies to detect the noise frequency generated by the instrument, during the operation of the instrument, the detection resonator consistent with the noise frequency will vibrate on the XY plane and drive the adjustment block to move in the X-axis direction. After the adjustment block moves, it drives the connecting plate to move in the Y-axis direction, and the connecting plate drives all the adjustable bottlenecks to move, so that the resonant frequency of the adjustable resonator changes to be consistent with the current noise frequency, so that all the adjustable resonators can play a silencing function, thereby improving the silencing effect.

[0029] As another preferred embodiment, the adjustment blocks are distributed on the outside of the connecting plate, and the adjustment blocks are provided with a slope for pushing the connecting plate to move up and down. The bottom of the slope is provided with a groove for clamping the connecting plate. The adjustment blocks correspond one-to-one to each of the detection resonators, and the adjustment blocks are staggered in the upper and lower directions.

[0030] Specifically, a return spring is installed on the adjustment block. At the same time, only one adjustment block will clamp the connecting plate in the groove inside it. At this time, the resonant frequency of the adjustable resonator is consistent with the resonant frequency of the detection resonator corresponding to the adjustment block.

[0031] The instrument noise drives one of the detection resonators to vibrate, and the detection resonator drives the adjustment block to move in the X-axis direction toward the connecting plate. Regardless of whether the connecting plate is above or below the groove in the adjustment block at this time, the adjustment block can clamp the connecting plate into the groove through the slope, thereby adjusting the resonant frequency of all adjustable resonators to be consistent with the current noise frequency.

[0032] As another preferred embodiment, the detection resonator and the adjustment block are transmitted via a transmission mechanism, and the transmission mechanism includes:

[0033] a slide plate slidably mounted inside the soundproof cover, the slide plate being fixedly connected to the adjustment block;

[0034] A push plate provided on the detection resonator for pushing the slide plate;

[0035] a clutch plate for controlling the cooperation between the slide plate and the push plate, the clutch plate comprising a vertical plate movably inserted into the push plate and a lifting plate slidably mounted on the top of the vertical plate, the vertical plate extending to the outside of the slide plate and blocking the push plate; and

[0036] A balancing assembly is mounted between the detection resonator and the sound enclosure.

[0037] Specifically, the push plate is concave in shape. In its initial static state, the vertical plate is inserted between the grooves of the push plate. The lifting plate can only move in the Y-axis direction, while the vertical plate can move in the Y-axis direction and can also move in the X-axis direction along with the slide plate. A damping member is provided on the slide plate to prevent the slide plate from sliding easily. A slide plate is provided above each detection resonator, and the slide plate is slidably mounted in a mounting seat. The balancing assembly includes spring devices symmetrically distributed about the active resonance cavity. When the resonant frequency of the detection resonator is inconsistent with the noise frequency, the detection resonator remains fixed under the action of the balancing assembly, and the adjustment block corresponding to the detection resonator does not contact the connecting plate.

[0038] When the resonant frequency of the detection resonator is consistent with the noise frequency, the detection resonator rotates due to vibration, causing the push plate to push the clutch plate to move, and the clutch plate then drives the slide plate and the adjustment block to move, causing the adjustment block to move toward the connecting plate, and drive the connecting plate and the adjustable bottleneck to move, adjusting the resonant frequency of the adjustable resonator to be consistent with the noise frequency.

[0039] As another preferred embodiment, a control mechanism for controlling the movement of the adjustment block is provided inside the soundproof cover, and the control mechanism includes:

[0040] a wedge block for pushing the clutch plate to move, the wedge block being slidably mounted on the slide plate;

[0041] A chute is provided inside the soundproof cover, the chute is P-shaped, the top, bottom and side ends of the chute are all inclined grooves, and the clutch plate is inserted into the bottom end of the chute;

[0042] A rolling ball placed inside the chute for one-way rolling;

[0043] a driven plate inserted into one side of the top of the chute and fixedly connected to the wedge block; and

[0044] A pressure plate is rotatably installed inside the sliding groove and is used to press the driven plate, and the rolling ball presses the driven plate to move through the pressure plate.

[0045] Specifically, a slide groove is provided above each detection resonator, and the wedge block is provided with an inclined surface for pushing the clutch plate, and the driven plate is movably inserted into the interior of the sound insulation cover; an inclined surface is provided on the top of the lifting plate to facilitate the rolling ball to squeeze the clutch plate to move upward in the Y-axis; in the initial state, the wedge block does not contact the clutch plate, and the top end of the lifting plate is not inserted into the bottom end of the slide groove.

[0046] As another preferred embodiment, the control mechanism further includes:

[0047] a push-back rod inserted into one side of a lower top end of the chute;

[0048] a first paddle provided on the detection resonator for pushing the push-back rod; and

[0049] A speed reduction belt is provided inside the top end of the chute to reduce the speed of the rolling ball.

[0050] Specifically, the push-back rod is movably inserted into the interior of the mounting seat, and the push-back rod is provided with a round rod inserted into the interior of the first shift plate. A long groove corresponding to the round rod is opened inside the first shift plate. When the first shift plate rotates with the detection resonator, it will drive the push-back rod to slide upward in the X-axis direction; in the initial state, the push-back rod is not inserted into the slide groove.

[0051] As another preferred embodiment, the detection resonator drives the rolling ball through a driving mechanism, and the driving mechanism includes:

[0052] a driving plate inserted from the bottom of the chute and used to push the rolling ball;

[0053] A second shift plate rotatably mounted inside the soundproof cover for pushing the drive plate; and

[0054] The one-way plate installed on the second shift plate is rotated, the one-way plate is a one-way rotating structure, the push plate pushes the slide plate to move in one direction through the one-way plate, and the clutch plate is located between the one-way plate and the push plate.

[0055] Specifically, the driving plate is provided with a cylinder inserted into the interior of the second shift plate, and a long groove corresponding to the cylinder is opened inside the second shift plate. After the second shift plate rotates, it will drive the driving plate to move in the Y-axis direction; the one-way plate is provided with a spring that can automatically reset it, and the driving plate is movably inserted into the interior of the mounting seat.

[0056] When the resonant frequency of the detection resonator is consistent with the noise frequency, the detection resonator rotates. After the detection resonator rotates clockwise, the push plate first contacts the vertical plate, and drives the vertical plate, slide plate, wedge block, driven plate and adjustment block to move right. After the adjustment block moves right, it drives the connecting plate to move upward along the Y axis, thereby adjusting the resonant frequency of the adjustable resonator. At the same time, the driven plate moves to the upper right of the pressure plate.

[0057] Then the push plate contacts the one-way plate and drives the second shift plate to rotate counterclockwise. The rotated second shift plate drives the driving plate to move up, and the driving plate pushes the ball from the lower right side of the chute to the upper right side, and the ball rolls counterclockwise in the chute. In this process, when the ball moves to the upper right side, the pressing plate rotates. The rotating pressing plate squeezes the driven plate, driving the driven plate and the wedge block to move right. The right-moving wedge block drives the vertical plate to move up, so that the bottom end of the vertical plate does not contact the push plate, and the top end of the lifting plate is inserted into the bottom end of the chute. By designing the clutch plate to be made of lightweight material, the weight of the clutch plate does not squeeze the wedge block to move.

[0058] Then, the detection resonator rotates counterclockwise. Since the vertical plate has moved upward, the push plate moving to the left will not affect the adjustment block. The adjustment block and the adjustable bottleneck both maintain a stable position, and the adjustable resonator can stably perform the silencing work.

[0059] By setting a speed bump, the ball rolls slowly inside the top end of the chute. When the noise matches the frequency of the detection resonator, the detection resonator swings back and forth on the XY plane, and drives the push-back rod to reciprocate through the first shift plate. The push-back rod is continuously inserted into the top end of the chute, pushing the ball back to the right, so that the ball cannot roll to the bottom end of the chute.

[0060] When the frequency of the noise changes to be inconsistent with the resonant frequency of the detection resonator, the detection resonator gradually becomes stationary, the push rod is no longer inserted into the slide slot, the ball rolls to the bottom end of the slide slot, and squeezes the lifting plate, causing the clutch plate to move downward. After the clutch plate moves downward, it pushes the wedge block to move left, and the vertical plate moves downward again. During the swinging process of the detection resonator before it stops, the push plate contacts the vertical plate and pushes the vertical plate and the adjustment block to move left, so that the adjustment block is separated from the connecting plate, so that another detection resonator that is consistent with the noise frequency can adjust the position of the connecting plate.

[0061] Furthermore, in order to improve the coordination effect between the push plate and the vertical plate, the left side plate of the push plate can be set as a plate that can rotate unidirectionally to the right.

[0062] In this way, the detection resonator that is consistent with the noise frequency automatically adjusts the mute frequency of all adjustable resonators, and automatically resets after it is inconsistent with the noise frequency, thereby improving the noise elimination effect. There is no need for manual operation, and there is no need to set up power monitoring and power drive devices. The structure is simple and the cost of use is reduced.

[0063] The beneficial effects of the present invention are:

[0064] (1) The present invention provides a soundproof cover on the outside of the particle size testing device. After the cover is closed, a closed soundproof space is formed, which greatly reduces the noise generated by the test, allows the test to be carried out for a long time, improves the test efficiency, and reduces the damage caused by noise to the experimenter.

[0065] (2) The present invention absorbs noise by detecting resonators and adjustable resonators, and the sound waves passing through the resonance cavity in the bottleneck will be reflected and reversed, thereby offsetting the original sound waves, which can further reduce noise, reduce the workload of the sound insulation cover and the noise escaping from the sound insulation cover, thereby improving the noise protection effect and allowing for longer-term and effective noise protection.

[0066] (3) The present invention detects the frequency of noise by setting a detection resonator, and drives the connecting plate to move through the adjustment block, thereby adjusting the mute frequency of the adjustable resonator accordingly, so that all adjustable resonators can play a mute function, thereby improving the mute effect.

[0067] (4) The present invention provides a movable detection resonator. The detection resonator with the same frequency as the noise will vibrate due to resonance, and this is used as a power source to automatically adjust the mute frequency of the adjustable resonator. Noises of different frequencies can be automatically muted throughout the entire process without manual operation, and without the need to set up power monitoring and power drive devices. The structure is simple and the cost of use is reduced.

[0068] (5) The present invention sets a control mechanism and a driving mechanism. When the detection resonator vibrates due to resonance and drives the adjustment block to move, the push plate separates from the adjustment block and no longer affects the adjustment block. When the noise frequency changes and the detection resonator becomes stationary, the push plate pushes the adjustment block to separate from the connecting plate again, so that another detection resonator with the same frequency as the noise can adjust the position of the connecting plate. In this way, it can be automatically recycled, with a simple structure and easy use.

[0069] In summary, the present invention has the advantages of simultaneously silencing and soundproofing the noise generated by the particle size testing device, greatly reducing the noise generated by the test, automatically adjusting the silencing frequency according to the frequency of the noise, requiring no manual operation, having a simple structure, and low cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0071] Figure 2 This is a partial schematic diagram of the installation status of the silencer;

[0072] Figure 3 Schematic diagram of the muffler unit;

[0073] Figure 4 It is a half-section diagram of the muffler part;

[0074] Figure 5 A half-section comparison of the test resonator and the adjustable resonator;

[0075] Figure 6 A half-section diagram of the structure for testing the coordination between the resonator and the slideway;

[0076] Figure 7 This is an exploded diagram of the structure of the push plate and the rolling ball;

[0077] Figure 8 for Figure 7 Enlarged view of part A;

[0078] Figure 9 The exploded diagram shows the coordination structure between the adjustment block and the driven plate. DETAILED DESCRIPTION

[0079] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0081] Example 1

[0082] like Figure 1-4 As shown, this embodiment provides a protective device for reducing particle size test noise, comprising:

[0083] A soundproof cover 1 covering the outside of the particle size testing device, wherein the soundproof cover 1 is provided with an openable and closable cover plate 11;

[0084] A muffler 2 provided inside the soundproof enclosure 1 for eliminating noise, the muffler 2 including a plurality of detection resonators 21 and an adjustable resonator 22; and

[0085] An adjusting mechanism 3 for adjusting the muffling frequency of the adjustable resonator 22;

[0086] The detection resonator 21 is used to detect the noise frequency in the soundproof enclosure 1 and eliminate the noise of a specific frequency. The noise elimination frequencies of the detection resonators 21 are different from each other. The detection resonators 21 are movably installed inside the soundproof enclosure 1; and

[0087] The adjustable resonator 22 is provided with an adjustable bottleneck 222 for adjusting the resonance frequency thereof, and the adjustment mechanism 3 is used to adjust the adjustable bottleneck 222 .

[0088] Specifically, the particle size testing device can be a laser particle size tester, which is provided with an ultrasonic device for mixing the solution evenly. The main material of the sound insulation cover 1 and the cover plate 11 is sound insulation cotton;

[0089] By providing a soundproof cover 1 with a soundproofing effect, the noise generated by the test is greatly reduced, the test can be carried out for a long time, the test efficiency is improved, and the damage to the experimenter caused by the noise is reduced. By providing an openable and closable cover 11 on the soundproof cover 1, it is convenient to place the sample.

[0090] Both the detection resonator 21 and the adjustable resonator 22 utilize Helmholtz resonators. A Helmholtz resonator is an acoustic structure consisting of an open resonance chamber with a bottleneck inserted at the opening. The sound absorption mechanism of a Helmholtz resonator is as follows: when the frequency of the incident sound wave matches the natural frequency of the cavity, the air inside the resonance chamber vibrates violently, generating heat energy through friction with the cavity walls. This achieves the conversion of acoustic energy into mechanical energy and then to internal energy, thereby eliminating sounds of specific frequencies.

[0091] The resonant frequency formula of the Helmholtz resonator is as follows:

[0092]

[0093] Where f0 is the resonant frequency of the Helmholtz resonator, c is the speed of sound, S is the cross-sectional area of ​​the bottleneck, d is the diameter of the bottleneck, l is the length of the bottleneck, d is the correction factor for the bottleneck length, and V is the volume of the resonance chamber.

[0094] From this we can see that in the Helmholtz resonator, the longer the bottleneck length is, the lower the resonant frequency of the resonator is, and correspondingly, the lower the sound absorption frequency of the resonator is.

[0095] In addition, since the sound waves passing through the resonance chamber in the bottleneck will be reflected and reversed, thereby canceling out the original sound waves, the noise can be further reduced, reducing the workload of the sound insulation cotton and the noise escaping from the sound insulation cover 1.

[0096] like Figure 5 As shown, further, the detection resonator 21 may include:

[0097] A movable resonance chamber 211 movably mounted on the inner top wall of the soundproof enclosure 1; and

[0098] A fixed bottleneck 212 is connected to the movable resonance chamber 211 .

[0099] Specifically, a mounting seat 12 is provided on the inner top wall of the sound insulation cover 1, and the movable resonance chamber 211 is movably installed in the mounting seat 12. When the noise frequency generated by the instrument is consistent with the resonance frequency of the movable resonance chamber 211, the air in the movable resonance chamber 211 vibrates violently, thereby driving the movable resonance chamber 211 to shake continuously.

[0100] like Figure 5 As shown, further, the adjustable resonator 22 includes:

[0101] A fixed resonance cavity 221 fixedly mounted on the inner top wall of the soundproof enclosure 1; and

[0102] The adjustable bottleneck 222 is connected to the fixed resonance chamber 221 and is a telescopic structure with adjustable length.

[0103] Specifically, the fixed resonance chamber 221 is fixedly installed in the mounting base 12. By adjusting the length of the adjustable bottleneck 222, the resonant frequency of the adjustable resonator 22 can be adjusted. After the frequency of the noise generated by the instrument changes, the resonant frequency of the adjustable resonator 22 changes accordingly, thereby achieving the function of fully silencing the noise with changing frequency.

[0104] like Figure 4-6 As shown, further, the adjustment mechanism 3 includes:

[0105] The connecting plate 31 connecting the adjustable bottlenecks 222 together: and

[0106] An adjustment block 32 for adjusting the height of the connecting plate 31 is movably installed inside the soundproof cover 1. The position of the adjustment block 32 matches the position of the detection resonator 21. The detection resonator 21 is used to control the movement of the adjustment block 32.

[0107] Specifically, the adjustment block 32 can only move in the X-axis direction; by setting a plurality of detection resonators 21 with different resonant frequencies to detect the noise frequency generated by the instrument, during the operation of the instrument, the detection resonator 21 consistent with the noise frequency will vibrate on the XY plane and drive the adjustment block 32 to move in the X-axis direction. After the adjustment block 32 moves, it drives the connecting plate 31 to move in the Y-axis direction. The connecting plate 31 drives all the adjustable bottlenecks 222 to move, so that the resonant frequency of the adjustable resonator 22 changes to be consistent with the current noise frequency, so that all the adjustable resonators 22 can play a silencing function, thereby improving the silencing effect.

[0108] like Figure 4 and Figure 6As shown, further, the adjustment block 32 is distributed on the outside of the connecting plate 31, and the adjustment block 32 is provided with a slope for pushing the connecting plate 31 to move up and down, and a groove for clamping the connecting plate 31 is provided at the bottom of the slope. The adjustment block 32 corresponds to each of the detection resonators 21 one by one, and the adjustment blocks 32 are staggered in the upper and lower directions.

[0109] Specifically, a return spring is installed on the adjustment block 32. At the same time, only one adjustment block 32 will clamp the connecting plate 31 in the groove inside it. At this time, the resonant frequency of the adjustable resonator 22 is consistent with the resonant frequency of the detection resonator 21 corresponding to the adjustment block 32.

[0110] The instrument noise drives one of the detection resonators 21 to vibrate, and the detection resonator 21 drives the adjustment block 32 to move in the X-axis direction toward the connecting plate 31. Regardless of whether the connecting plate 31 is located above or below the groove in the adjustment block 32 at this time, the adjustment block 32 can clamp the connecting plate 31 into the groove through the slope, thereby adjusting the resonant frequency of all adjustable resonators 22 to be consistent with the current noise frequency.

[0111] like Figure 6-7 As shown, further, the detection resonator 21 and the adjustment block 32 are transmitted through a transmission mechanism 4, and the transmission mechanism 4 includes:

[0112] A slide plate 41 slidably mounted inside the soundproof cover 1 , the slide plate 41 being fixedly connected to the adjustment block 32 ;

[0113] A push plate 42 provided on the detection resonator 21 for pushing the slide plate 41;

[0114] a clutch plate 43 for controlling the cooperation between the slide plate 41 and the push plate 42, the clutch plate 43 comprising a vertical plate 431 movably inserted into the push plate 42 and a lifting plate 432 slidably mounted on the top of the vertical plate 431, the vertical plate 431 extending to the outside of the slide plate 41 and blocking the push plate 42; and

[0115] A balancing component 44 is installed between the detection resonator 21 and the sound insulation cover 1 .

[0116] Specifically, the push plate 42 is concave in shape. In the initial static state, the vertical plate 431 is inserted between the grooves of the push plate 42. The lifting plate 432 can only move in the Y-axis direction, while the vertical plate 431 can move in the Y-axis direction and can also move in the X-axis direction along with the slide plate 41. The slide plate 41 is provided with a damping member to prevent the slide plate 41 from sliding easily. A slide plate 41 is provided above each detection resonator 21, and the slide plate 41 is slidably mounted in the mounting seat 12. The balancing assembly 44 includes a spring device symmetrically distributed about the active resonance cavity 211. When the resonant frequency of the detection resonator 21 is inconsistent with the noise frequency, the detection resonator 21 remains fixed under the action of the balancing assembly 44, and the adjustment block 32 corresponding to the detection resonator 21 does not contact the connecting plate 31.

[0117] When the resonant frequency of the detection resonator 21 is consistent with the noise frequency, the detection resonator 21 rotates due to vibration, causing the push plate 42 to push the clutch plate 43 to move, and the clutch plate 43 then drives the slide plate 41 and the adjustment block 32 to move, causing the adjustment block 32 to move toward the connecting plate 31, and drives the connecting plate 31 and the adjustable bottleneck 222 to move, thereby adjusting the resonant frequency of the adjustable resonator 22 to be consistent with the noise frequency.

[0118] like Figure 6-9 As shown, further, a control mechanism 5 for controlling the movement of the adjustment block 32 is provided inside the soundproof cover 1, and the control mechanism 5 includes:

[0119] a wedge block 51 for pushing the clutch plate 43 to move, the wedge block 51 being slidably mounted on the slide plate 41;

[0120] A chute 52 is provided inside the soundproof cover 1. The chute 52 is P-shaped. The top, bottom and side ends of the chute 52 are all inclined grooves. The clutch plate 43 is inserted into the bottom end of the chute 52.

[0121] A rolling ball 53 placed inside the chute 52 for unidirectional rolling;

[0122] A driven plate 54 inserted into one side of the top of the chute 52 and fixedly connected to the wedge block 51; and

[0123] A pressure plate 55 is rotatably installed inside the sliding groove 52 for pressing the driven plate 54 , and the rolling ball 53 is pressed by the pressure plate 55 to move the driven plate 54 .

[0124] Specifically, a slide groove 52 is provided above each detection resonator 21, and the wedge block 51 is provided with an inclined surface for pushing the clutch plate 43, and the driven plate 54 is movably inserted into the interior of the sound insulation cover 1; the top of the lifting plate 432 is provided with an inclined surface to facilitate the rolling ball 53 to squeeze the clutch plate 43 to move in the Y-axis direction; in the initial state, the wedge block 51 does not contact the clutch plate 43, and the top of the lifting plate 432 is not inserted into the bottom end of the slide groove 52.

[0125] like Figure 6-9 As shown, further, the control mechanism 5 also includes:

[0126] A push-back rod 56 inserted into the lower side of the top end of the chute 52;

[0127] a first shift plate 57 provided on the detection resonator 21 for pushing the push-back rod 56; and

[0128] A deceleration belt 521 is provided inside the top end of the chute 52 to decelerate the ball 53 .

[0129] Specifically, the push-back rod 56 is movably inserted into the interior of the mounting seat 12. The push-back rod 56 is provided with a round rod inserted into the interior of the first selector plate 57. The interior of the first selector plate 57 is provided with a long groove corresponding to the round rod. When the first selector plate 57 rotates with the detection resonator 21, it will drive the push-back rod 56 to slide in the X-axis direction; in the initial state, the push-back rod 56 is not inserted into the interior of the slide groove 52.

[0130] like Figure 6-9 As shown, further, the detection resonator 21 drives the rolling ball 53 through the driving mechanism 6, and the driving mechanism 6 includes:

[0131] A driving plate 61 inserted from the bottom of the chute 52 and used to push the ball 53;

[0132] A second shift plate 62 rotatably mounted inside the soundproof enclosure 1 for pushing the drive plate 61; and

[0133] The one-way plate 63 mounted on the second shift plate 62 is rotated. The one-way plate 63 is a one-way rotating structure. The push plate 42 pushes the slide plate 41 to move in one direction through the one-way plate 63. The clutch plate 43 is located between the one-way plate 63 and the push plate 42.

[0134] Specifically, the driving plate 61 is provided with a cylinder inserted into the interior of the second selector plate 62, and a long groove corresponding to the cylinder is opened inside the second selector plate 62. After the second selector plate 62 rotates, it will drive the driving plate 61 to move in the Y-axis direction; the one-way plate 63 is provided with a spring that can automatically reset it, and the driving plate 61 is movably inserted into the interior of the mounting seat 12.

[0135] by Figure 6 For example, when the resonant frequency of the detection resonator 21 is consistent with the noise frequency, the detection resonator 21 rotates. After the detection resonator 21 rotates clockwise, the push plate 42 first contacts the vertical plate 431, and drives the vertical plate 431, the slide plate 41, the wedge block 51, the driven plate 54 and the adjustment block 32 to move rightward. After the adjustment block 32 moves rightward, it drives the connecting plate 31 to move upward in the Y-axis, thereby adjusting the resonant frequency of the adjustable resonator 22. At the same time, the driven plate 54 moves to the upper right of the pressure plate 55.

[0136] Then the push plate 42 contacts the one-way plate 63 and drives the second dial plate 62 to rotate counterclockwise. The rotated second dial plate 62 drives the driving plate 61 to move upward. The driving plate 61 pushes the ball 53 from the lower right side of the slide groove 52 to the upper right side, and the ball 53 rolls counterclockwise in the slide groove 52. In this process, when the ball 53 moves to the upper right side, the pressing plate 55 is squeezed to rotate. The rotating pressing plate 55 squeezes the driven plate 54, driving the driven plate 54 and the wedge block 51 to move right. The right-moving wedge block 51 drives the vertical plate 431 to move upward, so that the bottom end of the vertical plate 431 does not contact the push plate 42, and the top end of the lifting plate 432 is inserted into the bottom end of the slide groove 52. By designing the clutch plate 43 to be made of lightweight material, the weight of the clutch plate 43 will not squeeze the wedge block 51 to move.

[0137] Then, the detection resonator 21 rotates counterclockwise. Since the vertical plate 431 has moved upward, the push plate 42 that moves leftward will not affect the adjustment block 32. The adjustment block 32 and the adjustable bottleneck 222 both maintain stable positions, and the adjustable resonator 22 can stably perform the silencing work.

[0138] By providing the speed reduction bump 521, the ball 53 rolls slowly inside the top end of the chute 52. When the noise matches the frequency of the detection resonator 21, the detection resonator 21 swings back and forth on the XY plane, and drives the push-back rod 56 to reciprocate through the first shift plate 57. The push-back rod 56 is continuously inserted into the top end of the chute 52, pushing the ball 53 back to the right, so that the ball 53 cannot roll to the bottom end of the chute 52.

[0139] When the frequency of the noise changes to be inconsistent with the resonant frequency of the detection resonator 21, the detection resonator 21 gradually becomes stationary, the push rod 56 is no longer inserted into the slide groove 52, and the ball 53 rolls to the bottom end of the slide groove 52 and squeezes the lifting plate 432, causing the clutch plate 43 to move downward. After the clutch plate 43 moves downward, it pushes the wedge block 51 to move left, and the vertical plate 431 moves downward again. Figure 6For example, during the swinging process of the detection resonator 21 before it comes to rest, the push plate 42 contacts the vertical plate 431 and pushes the vertical plate 431 and the adjustment block 32 to the left, so that the adjustment block 32 is separated from the connecting plate 31, so that another detection resonator 21 with the same frequency as the noise can adjust the position of the connecting plate 31;

[0140] Furthermore, in order to improve the cooperation effect between the push plate 42 and the vertical plate 431, Figure 7 For example, the left side plate of the push plate 42 can be set as a plate that can rotate unidirectionally to the right.

[0141] In this way, the detection resonator 21 that is consistent with the noise frequency automatically adjusts the mute frequency of all the adjustable resonators 22, and automatically resets after it is inconsistent with the noise frequency, thereby improving the noise elimination effect. There is no need for manual operation, and there is no need to set up power monitoring and power drive devices. The structure is simple and the cost of use is reduced.

[0142] Example 2

[0143] like Figure 8 As shown, the components identical or corresponding to those in the first embodiment are designated by the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0144] In this embodiment, a one-way baffle 522 is rotatably installed inside the sliding groove 52 to guide the movement trajectory of the rolling ball 53.

[0145] Specifically, by providing the one-way baffle 522 , the rolling ball 53 will not be deflected, so that the rolling ball 53 can stably roll in one direction in the chute 52 .

[0146] Working steps

[0147] Step 1: The soundproof cover 1 is installed on the outside of the particle size testing device. After the particle size testing device is started, the cover 11 is closed so that the soundproof cover 1 forms a closed soundproof space outside the particle size testing device, thereby significantly reducing the noise generated by the test;

[0148] Step 2: The noise generated by the ultrasound is absorbed by the detection resonator 21 which is consistent with the noise frequency, thereby reducing the noise amount and further improving the noise reduction and silencing effect;

[0149] Step 3: The detection resonator 21 that is consistent with the noise frequency vibrates, and drives the adjustment block 32 installed on the slide plate 41 to move through the push plate 42 and the clutch plate 43. The adjustment block 32 adjusts the length of all adjustable bottlenecks 222 through the connecting plate 31, and adjusts the resonant frequency of the adjustable resonator 22 to be consistent with the current noise frequency, so that all adjustable resonators 22 can play a silencing function on the noise of the current frequency, further improving the silencing effect;

[0150] Step 4: The push plate 42 on the vibrating detection resonator 21 drives the ball 53 to roll counterclockwise in the chute 52 through the second shift plate 62 and the drive plate 61. The ball 53 drives the wedge block 51 to move through the pressure plate 55 and the driven plate 54, so that the clutch plate 43 and the push plate 42 are staggered to prevent the vibrating detection resonator 21 from continuing to affect the adjustment block 32. The adjustment block 32 and the adjustable bottleneck 222 maintain a stable position, so that the adjustable resonator 22 can stably perform the silencing work;

[0151] Step 5: When the frequency of the ultrasonic noise changes, the previously vibrating detection resonator 21 becomes stationary.

[0152] Step 6: The detection resonator 21 becomes stationary, the push rod 56 is no longer inserted into the chute 52, and the ball 53 rolls to the bottom end of the chute 52 and squeezes the lifting plate 432, causing the clutch plate 43 to move downward. The push plate 42 contacts the clutch plate 43 again, and the clutch plate 43 drives the adjustment block 32 to separate from the connecting plate 31, so that another detection resonator 21 with the same frequency as the noise can adjust the position of the connecting plate 31.

[0153] Step 7: After the previous adjustment block 32 is separated from the connecting plate 31, the detection resonator 21 with the changed noise frequency begins to vibrate, and the corresponding adjustment block 32 continues to adjust the resonant frequency of the adjustable resonator 22, so that it continues to mute the noise after the frequency change.

[0154] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A protective device for reducing particle size test noise, characterized in that: include: A soundproof cover covering the outside of the particle size testing device, wherein the soundproof cover is provided with an openable and closable cover; A muffler portion provided inside the soundproof enclosure for eliminating noise, the muffler portion comprising a plurality of detection resonators and an adjustable resonator; as well as an adjusting mechanism for adjusting the muffling frequency of the adjustable resonator; The detection resonator is used to eliminate noise of a specific frequency, the noise elimination frequencies of the detection resonators are different from each other, and the detection resonator is movably installed inside the soundproof cover; as well as The adjustable resonator is provided with an adjustable bottleneck for adjusting its resonant frequency, and the adjustment mechanism is used to adjust the adjustable bottleneck; The regulating mechanism comprises: A connecting plate connecting the adjustable bottlenecks together; and an adjustment block for adjusting the height of the connecting plate, the adjustment block being movably mounted inside the soundproof enclosure, the position of the adjustment block matching the position of the detection resonator, and the detection resonator being used to control the movement of the adjustment block; The adjustment block can only move in the X-axis direction; by setting up multiple detection resonators with different resonant frequencies to detect the noise frequency generated by the instrument, during the operation of the instrument, the detection resonator consistent with the noise frequency will vibrate on the plane formed by the X-axis and the Y-axis, and drive the adjustment block to move in the X-axis direction. After the adjustment block moves, it drives the connecting plate to move in the Y-axis direction. The connecting plate drives all the adjustable bottlenecks to move, so that the resonant frequency of the adjustable resonator changes to be consistent with the current noise frequency, so that all adjustable resonators can play a noise reduction function.

2. A protective device for reducing particle size test noise according to claim 1, characterized in that: The detection resonator comprises: A movable resonance chamber movably mounted on the inner top wall of the soundproof enclosure; and A fixed bottleneck communicated with the movable resonance chamber.

3. The protective device for reducing particle size test noise according to claim 1, characterized in that: The tunable resonator comprises: A fixed resonance chamber fixedly mounted on the top wall of the soundproof enclosure; and An adjustable bottleneck is connected to the fixed resonance chamber, and the adjustable bottleneck is a telescopic structure with adjustable length.

4. The protective device for reducing particle size test noise according to claim 1, characterized in that: The adjustment blocks are distributed on the outside of the connecting plate. The adjustment blocks are provided with a slope for pushing the connecting plate to move up and down. A groove for clamping the connecting plate is provided at the bottom of the slope. The adjustment blocks correspond one-to-one to each of the detection resonators, and the adjustment blocks are staggered in the upper and lower directions.

5. The protective device for reducing particle size test noise according to claim 1, characterized in that: The detection resonator and the adjustment block are transmitted via a transmission mechanism, and the transmission mechanism includes: a slide plate slidably mounted inside the soundproof cover, the slide plate being fixedly connected to the adjustment block; A push plate provided on the detection resonator for pushing the slide plate; a clutch plate for controlling the cooperation between the slide plate and the push plate, the clutch plate comprising a vertical plate movably inserted into the push plate and a lifting plate slidably mounted on the top of the vertical plate, the vertical plate extending to the outside of the slide plate and blocking the push plate; and A balancing assembly is mounted between the detection resonator and the sound enclosure.

6. The protective device for reducing particle size test noise according to claim 5, characterized in that: A control mechanism for controlling the movement of the adjustment block is provided inside the soundproof cover, and the control mechanism includes: a wedge block for pushing the clutch plate to move, the wedge block being slidably mounted on the slide plate; A chute is provided inside the soundproof cover, the chute is P-shaped, the top, bottom and side ends of the chute are all inclined grooves, and the clutch plate is inserted into the bottom end of the chute; A rolling ball placed inside the chute for one-way rolling; a driven plate inserted into one side of the top of the chute and fixedly connected to the wedge block; and A pressure plate is rotatably installed inside the sliding groove and is used to press the driven plate, and the rolling ball presses the driven plate to move through the pressure plate.

7. The protective device for reducing particle size test noise according to claim 6, characterized in that: The control mechanism further comprises: a push-back rod inserted into one side of a lower top end of the chute; a first paddle provided on the detection resonator for pushing the push-back rod; and A speed reduction belt is provided inside the top end of the chute to reduce the speed of the rolling ball.

8. The protective device for reducing particle size test noise according to claim 6, characterized in that: The detection resonator drives the rolling ball through a driving mechanism, and the driving mechanism includes: a driving plate inserted from the bottom of the chute and used to push the rolling ball; A second shift plate rotatably mounted inside the soundproof cover for pushing the drive plate; and The one-way plate installed on the second shift plate is rotated, the one-way plate is a one-way rotating structure, the push plate pushes the slide plate to move in one direction through the one-way plate, and the clutch plate is located between the one-way plate and the push plate.

9. The protective device for reducing particle size test noise according to claim 6, characterized in that: A one-way baffle is rotatably installed inside the sliding groove to guide the movement trajectory of the rolling ball.

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