Sound insulation gate of reverberation room

Abstract

The invention discloses a reverberation room sound insulation gate, and relates to the technical field of acoustic environment tests for spacecrafts, the reverberation room sound insulation gate comprises a gate body and a ground rail, a guide mechanism is installed at the top end of the gate body, a walking mechanism is installed at the bottom end of the gate body, the walking mechanism comprises a driving wheel and a driven wheel, and the driving wheel and the driven wheel are installed at the two ends of the bottom of the gate body respectively; a guide protrusion is arranged in the ground rail, the driving wheel and the driven wheel make contact with the top end of the guide protrusion, a support is installed at the bottom end of the gate body, a driving wheel box is installed on the support, an installation base is installed at the top end of the driving wheel box, and the top end of the installation base is connected with the bottom end of the gate body. Steel plate supports are installed at the front end and the rear end of the driving wheel box and connected with the driving wheel box through fastening screws, and a plurality of guide wheels are installed at the bottom ends of the steel plate supports, located at the front end and the rear end of the guide protrusion and make contact with the front end face and the rear end face of the guide protrusion.

Description

Technical Field

[0001] The present invention belongs to the technical field of acoustic environment testing technology for spacecraft, and particularly relates to a reverberation chamber sound insulation door. Background Art

[0002] The term reverberation chamber is used in both the acoustic field and the electromagnetic field. In fact, the term reverberation chamber in the electromagnetic field is derived from the acoustic field. Here, to distinguish between the two, the reverberation chamber in the acoustic field is called an acoustic reverberation chamber, and the reverberation chamber in the electromagnetic field is called a radio wave reverberation chamber. An acoustic reverberation chamber is a laboratory that can fully reflect sound energy on all boundaries and diffuse it therein to form a diffusion field with uniform energy density everywhere and random distribution in all propagation directions. The main functions of an acoustic reverberation chamber are: measuring the sound absorption coefficient of materials, sound absorption in the air, sound power and spectrum of sound sources, machines, equipment, etc., measuring the acoustic performance such as the efficiency of certain electroacoustic devices and equipment, and conducting noise fatigue tests on sensitive parts.

[0003] For example, a Chinese invention patent document with an application publication number of CN102747938B discloses an acoustic reverberation chamber sound insulation door, which includes a door skeleton welded by channel steel and I-beam inside and door inner surface steel plates and door outer surface steel plates arranged on both side surfaces of the door skeleton. The total thickness of the door skeleton and the inner and outer surface steel plates is 490 mm, and bumps are protrudingly arranged around the inner and outer surfaces of the door to cooperate with a sealing airbag for sealing. Sound absorption and damping materials are also filled in the gaps of the door skeleton. The reverberation chamber sound insulation door of the present invention greatly reduces the overall weight of the door on the basis of ensuring the sound insulation amount and the acoustic effect of the reverberation chamber. At the same time, since the steel structure door adopts mechanical processing means, its dimensional accuracy can be guaranteed, ensuring the operation reliability of the door.

[0004] Another example is a Chinese invention patent document with an application publication number of CN110029902A, which discloses a large-scale sound insulation door walking guiding mechanism for a reverberation chamber, including: a door operation base, a door driving mechanism, a bottom side guiding support, a door bottom guiding device, and a door top guiding device. Among them, the door driving mechanism operates on the bottom door operation base to drive the door to open and close. The bottom side guiding support, the door bottom guiding device, and the door top guiding device jointly ensure the straight-line operation of the door and bear the dynamic load perpendicular to the door during the test to ensure that the door does not slide. The present invention solves the problem of the dynamic load perpendicular to the door during the door noise test, avoids the side slip and deviation problems during the door test and opening and closing, and at the same time, the long cylindrical rollers of the door driving improve the bearing capacity and avoid the deformation problem of local point contact, so that the door can operate reliably and smoothly.

[0005] Due to improper design, the load-bearing walking wheels of the sound-insulating door in the prior art center are worn by the ground rail for a long time. After a long time, the walking wheels are severely worn, resulting in inflexible movement of the sound-insulating door. Summary of the Invention

[0006] In view of the above problems in the prior art, the purpose of the present invention is to provide a reverberation chamber sound-insulating door.

[0007] The present invention provides the following technical solutions:

[0008] A reverberation chamber sound-insulating door includes a door body and a ground rail. The bottom of the door body is connected to the ground rail. A walking mechanism is installed at the bottom end of the door body. The walking mechanism includes a driving wheel and a driven wheel. The driving wheel and the driven wheel are respectively installed at both ends of the bottom of the door body. A guiding protrusion is provided in the ground rail. The driving wheel and the driven wheel are in contact with the top end of the guiding protrusion. A bracket is installed at the bottom end of the door body, and a driving wheel box is installed on the bracket. An installation base is installed at the top end of the driving wheel box. The installation base and the driving wheel box are connected by hexagon bolts. The top end of the installation base is connected to the bottom end of the door body. The driving wheel and the driven wheel are rotatably installed in the driving wheel box. Steel plate brackets are installed at the front and rear ends of the driving wheel box. The steel plate brackets and the driving wheel box are connected by set screws. A plurality of guide wheels are installed at the bottom end of the steel plate brackets. The guide wheels are located at the front and rear ends of the guiding protrusion, and the guide wheels are in contact with the front and rear end faces of the guiding protrusion.

[0009] As a further technical solution, a reduction motor is installed on the bracket, and a reinforcement is installed between the bracket and the door body. The bottom end of the reduction motor is connected to a gear box. A worm and gear transmission is installed in the gear box. A transmission sprocket is installed in the gear box. The transmission sprocket is connected to the worm and gear transmission. A driven sprocket is sleeved on the driving wheel. A chain is installed between the transmission sprocket and the driving wheel.

[0010] As a further technical solution, a driven axle is installed in the driving wheel box. Clamping axle plates are installed on both sides of the driven axle. The clamping axle plates are connected to the driving wheel box. The driving wheel and the driven sprocket are both installed on the driven axle. The driven sprocket is connected to the driving wheel by a precision bolt. A shaft sleeve is installed on the other side of the driving wheel. A through cover is sleeved on the shaft sleeve. The through cover and the driving wheel are installed with hexagon bolts. A felt seal is installed between the through cover and the shaft sleeve.

[0011] As a further technical solution, a spherical roller bearing is sleeved between the driven axle and the driving wheel. A lubrication channel is provided in the driven axle. One end of the lubrication channel is installed with a straight-through grease cup. The straight-through grease cup is installed on the clamping axle plate. A spacer ring is installed in the spherical roller bearing. A guide wheel member is also installed on the driving wheel box. The guide wheel member meshes with the chain.

[0012] As a further technical solution, sealing mechanisms are installed at both ends of the top of the gate body.

[0013] As a further technical solution, the sealing mechanism includes a sealing airbag. The gate body is movably installed in the reverberation chamber cavity. An airbag seat is installed in the reverberation chamber cavity. Adjusting flat irons are installed on both sides of the airbag seat. The sealing airbag is installed on the airbag seat, and steel plate pressing plates are installed on both sides of the airbag seat.

[0014] As a further technical solution, a guiding mechanism is installed at the top end of the gate body.

[0015] As a further technical solution, the guiding mechanism includes a base. The base is connected to the gate body. A shaft is installed on the base. A bearing seat is installed on the shaft. A deep groove ball bearing is sleeved on the bearing seat. A spacer sleeve is sleeved between the bearing seat and the deep groove ball bearing. A shaft baffle is installed on one side of the deep groove ball bearing, and a guiding wheel bracket is installed above the shaft.

[0016] As a further technical solution, a maintenance ladder is installed on one side of the gate body, and a ladder handrail is installed on the maintenance ladder.

[0017] As a further technical solution, the gate body includes a door body component. Side column components are installed on both sides of the door body component. A door bottom component is installed at the bottom of the door body component. A door top component is installed at the top of the door body component. The door body component includes a plurality of module ones.

[0018] The beneficial effects of the present invention are:

[0019] The sound insulation gate is divided into multiple modules and is convenient to install by means of assembly. Moreover, the sound insulation gate is designed with a three-layer structure to improve the sound insulation performance. The four sides of the sound insulation gate adopt thick steel plate bending components to adjust the overall error and can reduce the friction between the sound insulation gate and the sealing airbag when it is opened. The guiding mechanism plays a role in guiding and positioning and bears a certain lateral pressure. It cooperates with the walking mechanism to realize the opening and closing of the sound insulation gate, reducing the frictional resistance. The walking mechanism is used to carry the sound insulation gate to realize the opening and closing of the door. The sealing device reduces the gap between the door and the wall to prevent the sound in the laboratory from spreading outwards, thereby improving the overall sound insulation amount of the door. Secondly, the sealing device can also prevent the flow of internal and external gases and prevent the leakage of internal toxic gases to achieve the purpose of safety. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1 is the front view structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of the gate body, floor track, and reverberation chamber wall of the present invention;

[0023] Figure 3 It is a schematic structure diagram of the gate body of the present invention;

[0024] Figure 4 It is of the present invention Figure 3 Schematic cross-sectional structure diagram of the A-A plane;

[0025] Figure 5 It is a schematic structure diagram of the traveling mechanism of the present invention;

[0026] Figure 6 It is a schematic left-view cross-sectional structure diagram of the drive wheel box of the present invention;

[0027] Figure 7 It is a schematic top-view structure diagram of the traveling mechanism of the present invention;

[0028] Figure 8 It is a schematic structure diagram of the installation position of the sealing mechanism of the present invention;

[0029] Figure 9 It is a schematic structure diagram of the sealing mechanism of the present invention;

[0030] Figure 10 It is a schematic structure diagram of the guiding mechanism of the present invention;

[0031] Figure 11 It is a schematic A-direction structure diagram of the present invention;

[0032] Figure 12 It is a schematic diagram of sound wave propagation of the present invention;

[0033] Figure 13 It is a diagram of the gas transmission process of the sealing airbag of the present invention.

[0034] The labels in the figure are: 1. Gate body; 2. Module 1; 3. Maintenance ladder; 4. Driving wheel; 5. Driven wheel; 6. Guide mechanism; 7. Sealing mechanism; 8. Floor rail; 9. Ladder handrail; 10. Side column component; 11. Door top component; 12. Door body component; 13. Door bottom component; 14. Reducing motor; 15. Reinforcement; 16. Hexagon bolt; 17. Chain; 18. Set screw; 19. Installation base; 20. Driving wheel box; 21. Driven sprocket; 22. Precision reaming bolt; 23. Driving sprocket; 24. Through cover; 25. Felt seal; 26. Bush; 27. Driven axle; 28. Straight-through grease cup; 29. Shaft clamping plate; 31. Spherical roller bearing; 32. Spacer ring; 33. Guide wheel component; 34. Sealing airbag; 35. Reverberation chamber wall; 36. Airbag seat; 37. Steel plate pressing plate; 38. Adjusting flat iron; 39. Guide wheel bracket; 40. Shaft baffle; 41. Bearing housing; 42. Deep groove ball bearing; 43. Shaft; 44. Sleeve; 45. Base; 46. Guide wheel; 47. Steel plate bracket; 48. Guide protrusion; 49. Bracket. Detailed implementation mode

[0035] As Figures 1-4 shown, the present invention provides a reverberation chamber sound insulation gate, including a gate body 1 and a floor rail 8. The floor rail 8 should be a concrete foundation below, with a flat surface and steel plate embedded parts reserved for fixing the floor rail 8. The gate body 1 is an electric push-pull steel structure gate. The bottom of the gate body 1 is connected to the floor rail 8, and the gate body 1 runs on the floor rail 8. A traveling mechanism is installed at the bottom end of the gate body 1, and a maintenance ladder 3 is installed on one side of the gate body 1. A ladder handrail 9 is installed on the maintenance ladder 3. As Figure 2 shown, the traveling mechanism is lower than the bottom surface, and a maintenance trench is provided at the floor rail 8. The traveling mechanism includes a driving wheel 4 and a driven wheel 5. The driving wheel 4 and the driven wheel 5 are respectively installed at both ends of the bottom of the gate body 1. A guide protrusion 48 is provided in the floor rail 8. The driving wheel 4 and the driven wheel 5 are in contact with the top of the guide protrusion 48. The driving wheel 4 and the driven wheel 5 meet the requirements of load-bearing and walking. Specifically, during installation, the traveling mechanism is first debugged. After the debugging is completed, the sound insulation gate is placed on the traveling mechanism and the relative position of the sound insulation gate is adjusted by adjusting bolts. Finally, it is fixed by electric welding. The opening and closing of the sound insulation gate are realized through the traveling mechanism.

[0036] Embodiment 1

[0037] The gate body 1 includes a door body component 12. Side column components 10 are installed on both sides of the door body component 12. A door bottom component 13 is installed at the bottom of the door body component 12. A door top component 11 is installed at the top of the door body component 12. The door body component 12 includes a plurality of modules 1 2. The door top component 11, the door bottom component 13 and the side column component 10 have the same structure. The door top component 11 is a bent steel plate, and the bent steel plate wraps the side of the door body component 12 to adjust the overall error.

[0038] To ensure the sound insulation effect of the sound insulation door, the sound insulation door is filled with a combination of glass wool and concrete. Specifically, the structure of the sound insulation door is: inner panel - steel plate 1 - steel plate 2 - outer panel. Concrete is filled between the inner panel and steel plate 1, glass wool is filled between steel plate 1 and steel plate 2, and concrete is filled between steel plate 2 and the outer panel. The two sides are overlapped with steel plates of different thicknesses, and the coincidence valleys are staggered from each other, and each coincidence valley is relatively shallow, improving the sound insulation effect. As an optimal solution, the structure of the sound insulation door is: inner panel 10mm + 100mm C30 concrete + 4mm steel plate + 218mm 32K glass wool + 4mm steel plate + 100mm C30 concrete + outer panel 14mm steel plate. Threaded steel bars are used as tension bars inside both the inner panel and the outer panel, specifically φ12mm threaded steel bars with a spacing of 100mm as tension bars.

[0039] The sound insulation effect that can be achieved by designing the above dimensions is (assuming the density of the steel plate is 7850 kg / m 3 , the density of the concrete is 2500 kg / m 3 , the density of the air is 1.29 kg / m 3 , and assuming rigid point connection is used between the two steel plates):

[0040] Calculated according to the empirical formula

[0041]

[0042] (M1 + M2 > 200 kg / m 2 )

[0043] In the formula: M1, M2 - the surface density of the plate (kg / m 2 );

[0044] ΔR is the additional sound insulation amount generated by the intermediate air layer, which is 12 dB;

[0045] The average sound insulation amount of the sound insulation door is obtained

[0046] And the overall resonance frequency of the sound insulation door is:

[0047] For a 160 dB(A) sound source in a high-intensity reverberation chamber, the sound pressure levels of each octave band correspond to the center frequencies as shown in the following table,

[0048] The sound pressure levels of each octave band

[0049] Frequency (Hz) 31.5 63 125 250 500 1000 2000 4000 8000 Sound Pressure Level (dB(A)) 131 136 146 149 152 149 143 136 133

[0050] The overall door leaf is equivalent to a double-layer sound insulation structure, and its resonance frequency calculation formula is:

[0051]

[0052] where: M1, M2—the surface density of the two layers of plates (kg / m 2 );

[0053] ρ—the air density, which is 1.29 kg / m at room temperature 3 ;

[0054] c—the speed of sound, which is 344 m / s at room temperature;

[0055] d—the thickness of the air layer between the two plates (m).

[0056] Substituting the above values into the formula gives: f0 = 10.6 Hz < 20 Hz.

[0057] Example 2

[0058] As Figures 5-7 shown, on the basis of the above Example 1, the traveling mechanism is electrically conductive by a cable and is provided with electric and manual modes, and its rated load-bearing capacity reaches 400 KN. A ground control cabinet is additionally provided for the traveling mechanism, and the opening and closing of the door are controlled by three buttons of forward, reverse, and stop. A bracket 49 is installed at the bottom end of the door body 1 of the large door, a driving wheel box 20 is installed on the bracket 49, an installation base 19 is installed at the top end of the driving wheel box 20, and the installation base 19 and the driving wheel box 20 are connected by hexagon bolts 16. The top end of the installation base 19 is connected to the bottom end of the door body 1 of the large door. The driving wheel 4 and the driven wheel 5 are rotatably installed in the driving wheel box 20. The driving wheel 4 and the driven wheel 5 not only support the door body of the large door but also serve as the driving structure of the door body of the large door, making it labor-saving when the door body of the large door moves linearly by the rotation of the driving wheel 4 and the driven wheel 5.

[0059] In order to further reduce the supporting force of the driving wheel 4 and the driven wheel 5, steel plate brackets 47 are installed at the front and rear ends of the driving wheel box 20. The steel plate brackets 47 and the driving wheel box 20 are connected by set screws 18. A plurality of guide wheels 46 are installed at the bottom end of the steel plate brackets 47. The guide wheels 46 are located at the front and rear ends of the guiding protrusion 48, and the guide wheels 46 are in contact with the front and rear end faces of the guiding protrusion 48. When the door body of the large door moves, the guide wheels 46 are in contact with the guiding protrusion 48, making the movement of the sound-insulating large door more flexible.

[0060] Among them, the total weight of the sound-insulating large door and the traveling mechanism is 65 t, and it is approximately considered to be evenly borne by 2 pairs of wheel sets.

[0061] Regarding the wheel pressure of the driving wheel 4 and the driven sprocket 21

[0062] Driving wheel:

[0063]

[0064] where: P1—the wheel pressure of the driving wheel set;

[0065] P1 = 32.5t

[0066] Similarly, the wheel pressure of the driven sprocket can be obtained as follows:

[0067]

[0068] In the formula: P2—the wheel pressure of the driven sprocket group;

[0069] P2 = 32.5t

[0070] In addition, regarding the selection of the motor,

[0071] 1) The resistance to motion is,

[0072] The maximum frictional resistance during operation,

[0073]

[0074] In the formula, G—the dead weight, G = 65t;

[0075] K—the rolling friction arm, obtained from the table as K = 0.05 cm;

[0076] μ—the bearing friction coefficient, obtained from the table as μ = 0.015;

[0077] K 附 —the additional friction resistance coefficient, K 附 = 1.5;

[0078] D 轮 —the wheel diameter, D 轮 = 45.7 cm;

[0079] d—the bearing inner diameter, d = 9 cm;

[0080]

[0081] 2) Select the motor and determine the reducer:

[0082] The static power of the motor during operation:

[0083]

[0084] In the formula, P 静满 —the static resistance during the operation of the sound-insulating door, P 静满 = 0.501t;

[0085] V—the speed during the operation of the sound-insulating door, V = 5 m / min;

[0086] η—the transmission efficiency of the sound-insulating door operating mechanism, η = 0.6;

[0087] m—the number of motors, m = 1;

[0088]

[0089] Select the motor:

[0090] N = K 电 *N 静

[0091] Wherein

[0092] K 电 ——Power increase coefficient to overcome inertia during motor startup, take K 电 = 1.2;

[0093] N = 1.2 x 0.682 = 0.818 kW.

[0094] 3) Determine the transmission ratio:

[0095] The motor itself is equipped with a reducer, the reduction ratio is 81.5, the number of teeth of the motor output shaft is 16, and the number of teeth of the driving sprocket on the sound-insulating door is 41, then the transmission ratio is:

[0096]

[0097] According to the transmission ratio, calculate the actual operating speed:

[0098]

[0099] The electric operating speed is not higher than 5 m / min.

[0100] Specifically, a reduction motor 14 is installed on the bracket 49. The reduction motor 14 is preferably a three-phase asynchronous low-noise motor, with a rated power of 3KW, a three-phase AC voltage of 380V, a frequency of 50HZ, and a protection level of IP55. A reinforcement member 15 is installed between the bracket 49 and the door body 1 of the gate. The bottom end of the reduction motor 14 is connected to a gearbox, and a worm and gear transmission is installed inside the gearbox. During operation, the reduction motor 14 drives the worm and gear transmission to work, and the power is transmitted to the driving sprocket 23 through the worm and gear transmission. A driving sprocket 23 is installed inside the gearbox, and the driving sprocket 23 is connected to the worm and gear transmission. A driven sprocket 21 is sleeved on the driving wheel 4, and a chain 17 is installed between the driving sprocket 23 and the driving wheel 4. The power of the driving sprocket 23 is transmitted to the driven sprocket 21 through the chain 17, thereby driving the driving wheel 4 to rotate.

[0101] Inside the drive wheel box 20, a trailer axle 27 is installed. On both sides of the trailer axle 27, axle clamping plates 29 are installed. The axle clamping plates 29 are connected to the drive wheel box 20. Both the drive wheel 4 and the driven sprocket 21 are installed on the trailer axle 27. The driven sprocket 21 is connected to the drive wheel 4 by a precision bolt 22. On the other side of the drive wheel 4, a bushing 26 is installed. A through cover 24 is sleeved on the bushing 26. The through cover 24 and the drive wheel 4 are installed with hexagon bolts 16. A felt seal ring 25 is installed between the through cover 24 and the bushing 26.

[0102] A spherical roller bearing 31 is sleeved between the trailer axle 27 and the drive wheel 4. A lubrication channel is provided inside the trailer axle 27. At one end of the lubrication channel, a straight-through grease cup 28 is installed. The straight-through grease cup 28 is installed on the axle clamping plate 29. A spacer ring 32 is installed inside the spherical roller bearing 31. A guide wheel component 33 is also installed on the drive wheel box 20. The guide wheel component 33 meshes with the chain 17. The rapid movement of the sound insulation door is achieved through the cooperation of the drive wheel 4 and the driven wheel 5.

[0103] Regarding the drive wheel 4,

[0104] Drive wheel: The tread diameter D = 457mm,

[0105] Calculated wheel load of the drive wheel:

[0106] The maximum wheel load of the drive wheel is used as the calculated wheel load during fatigue calculation.

[0107] P 计 = K1 * γ * P

[0108] In the formula

[0109] P - The maximum wheel load is used as the calculated wheel load during fatigue calculation.

[0110] K1 - Equivalent impact coefficient, K1 = 1;

[0111] γ - Load change coefficient, γ = 1

[0112] P 计 = 1 * 1 * 32.5 * 10 3 * 10 = 325000N

[0113] Calculation of the fatigue strength of the drive wheel tread:

[0114] P 计 ≤ K1DlC1C2

[0115] P 计 : Calculated load of the drive wheel tread

[0116] K1: Allowable linear stress coefficient related to the material, here it is taken as 3.8

[0117] D: Wheel diameter, D = 457 mm

[0118] l: Effective contact length between the wheel and the track, l = 190 mm

[0119] C1: Rotation speed coefficient, here it is taken as 1.17

[0120] C2: Working level coefficient, here it is taken as 1.25

[0121] Calculated P 计 <K1DlC1C2 = 3.8 * 457 * 190 * 1.17 * 1.25 = 482557.725 N.

[0122] Regarding the driven axle

[0123] Select the material as 40Cr and perform quenching and tempering treatment. Check the mechanical design manual to obtain the mechanical properties of the material as follows:

[0124] Tensile strength: σ b = 750 Mpa

[0125] Yield point: σ s = 550 Mpa

[0126] Bending fatigue limit: σ -1 = 350 Mpa

[0127] Torsional fatigue limit: τ -1 = 200 Mpa

[0128] Preliminarily calculate the shaft diameter according to the formula. Since the material is 40Cr, select C = 97 from the table, then we get

[0129]

[0130] P: Power transmitted by the shaft (kW)

[0131] n: Rotation speed of the shaft (rpm)

[0132] Generally, when there is a keyway on the shaft, the shaft diameter is increased by 5%;

[0133] d1 = 53.38 * 105% = 56.05 mm

[0134] The shaft diameter is taken as 90 mm, and the verification of the spherical roller bearing

[0135] Basic rated dynamic load

[0136]

[0137] C: Calculated value of the basic rated dynamic load

[0138] P: Equivalent dynamic load, which is 37.5 kN

[0139] f k : Life factor, take 1.23

[0140] f n : Speed factor, 1.75 r / min

[0141] f m : Moment load factor, take 2

[0142] f d : Impact load factor, take 1.2

[0143] f t : Temperature factor

[0144] The calculated basic rated dynamic load is

[0145]

[0146] Rated static load: C0 = S0P0

[0147] C0: Calculated value of the basic rated static load

[0148] P0: Equivalent static load, which is 37.5 kN

[0149] S0: Safety factor, take 2 here

[0150] Calculated C0 = 37.5 * 2 = 75 KN

[0151] Look up the table to get: The basic rated dynamic load of the spherical roller bearing is 372 kN, and the basic rated static load is 440 kN.

[0152] Example 3

[0153] On the basis of the above Example 2, in order to further improve the sound insulation effect of the sound insulation door, sealing mechanisms 7 are installed at both ends of the top of the door body 1 of the door. The sealing mechanism adopts the traditional sealing form of a sealing airbag. The sealing mechanism is installed on the wall of the overlapping part of the sound insulation door and the wall. The sound insulation door is sealed with two layers of seals inside and outside. The sealing ring needs to fit the sound insulation door without leaking sound, and each sealing ring is independently supplied with air. As Figure 8 and Figure 9As shown in the figure, the sealing mechanism 7 includes a sealing airbag 34. The large door body 1 is movably installed in the reverberation chamber cavity 35. An airbag seat 36 is installed in the reverberation chamber cavity 35. The airbag seat 36 is fixed by three pressing plates, which ensures that the airbag does not fall off and is convenient for maintenance, and can ensure convenient installation, beautiful appearance and strong sealing firmness. In order to prevent the airbag from being cut by sharp angles, all corners are designed to be processed into chamfers with a diameter of Ф0.5mm. Adjusting flat irons 38 are installed on both sides of the airbag seat 36. Considering the possible errors in civil construction, in this design, the airbag seat and the embedded steel plates around the wall are connected by movable double-layer galvanized flat irons. The outer flat iron is welded discontinuously to the existing embedded parts. According to the size of the sound insulation door, the ejection port of the sealing airbag is 18mm away from the top of the sound insulation door, so as to minimize the rubbing between the sound insulation door and the airbag seat during the walking process due to the civil construction size error. The sealing airbag 34 is installed on the airbag seat 36. Steel plate pressing plates 37 are installed on both sides of the airbag seat 36. The airbag seat 36 is spot-welded to the adjusting flat iron 38 and is directly welded discontinuously to the adjusting flat iron 38 after debugging. The gaps between the airbag seat 36 and the wall are sealed with concrete pouring.

[0154] The structure of the sealing mechanism is a sealing airbag type inflatable sealing form. It is preferably a sealing airbag with a size of 50×28mm and a wall thickness of 2.5mm. The raw material is butyl rubber, with a tensile strength ≥8.4MPa, an elongation at break ≥450%, and a hot tensile deformation ≤35%. When the sound insulation door is closed, the air source control valve is opened to start inflating the sealing airbag, and the sealing mechanism comes into play. When the inflation pressure of the sealing airbag reaches 0.4Mpa, the control valve will automatically close and stop working. When the sound insulation door needs to be opened, first open the air release control valve of the sealing airbag conduit to release the air. When the air in the sealing airbag is completely released, the sealing airbag shrinks into the groove and then the sound insulation door is opened.

[0155] At the same time, the sealing airbag needs to be subjected to a pressure holding test:

[0156] 1) Make the air inlet opening number, and lay the sealing airbag flat and smooth on a clean floor as a whole.

[0157] 2) Select clean and dry compressed air for the ventilation test.

[0158] 3) First inflate and press the sealing airbag until it bulges, and then extend the convex circle, and stop inflating and pressing.

[0159] 4) Since the sealing airbag is not installed in the sealing airbag seat, a whole leakage test is carried out. It is necessary to spray the interface part with soapy water and observe the surface bubbles.

[0160] 5) A pressure gauge needs to be prepared in advance. The pressure holding test time is 15 minutes and the pressure is 0.2Mpa.

[0161] Furthermore, a top door component 11, a bottom door component 13, and side column components 10 are provided on the door body 1 of the large door, which can reduce the friction between the door leaf and the sealing airbag when the door leaf is opened.

[0162] The main purpose of the sealing mechanism is to reduce the gap between the sound insulation door and the wall, prevent the sound in the laboratory from spreading outwards, and thus improve the overall sound insulation of the sound insulation door. Secondly, the sealing mechanism can also prevent the flow of internal and external gases and prevent the leakage of internal toxic gases to achieve safety purposes. When the reverberation chamber is in operation, the propagation of internal sound waves is as Figure 12 shown.

[0163] Equivalent each sealing airbag to a double-layer homogeneous partition wall, and its average sound insulation calculation empirical formula is:

[0164]

[0165] Known conditions: The density of the rubber of the sealing airbag is: ρ = 1.14 * 103 kg / m3;

[0166] The thickness of the rubber wall of the sealing airbag is: t = 2.5 mm;

[0167] ΔR is the additional sound insulation amount generated by the intermediate air layer, and it can be taken as 9 dB;

[0168] After calculating the surface density with ρ and t, substitute the above values into the formula to obtain the sound insulation amount of one sealing airbag. The sound insulation amount of two sealing airbags plus the additional sound insulation amount of the air layer between the two sealing airbags reaches 40.2 dB. The four sealing airbags on both sides of the door plus the additional sound insulation amount of the intermediate air layer, the overall sound insulation amount is 58.2 dB. Therefore, using pneumatic tire sealing will not affect the overall sound insulation of the door.

[0169] In the sealing mechanism, the sealing airbag needs gas to be inflated. Since there is a gas source near the reverberation chamber, there is no need to use an air compressor. The gas transmission process is as Figure 13 shown.

[0170] In the circuit control, when the soundproof door needs to be closed, the electric travel mechanism switch is started, and the switch is set to fast, fast to slow, and slow stop. After the soundproof door stops, the gas source control electromagnetic valve is given, the control valve is opened, and when the sealing airbag is inflated to a predetermined pressure, the pressure gauge gives a signal to the control electromagnetic valve to close the inflation control electromagnetic valve. When the soundproof door is closed and moved, the infrared sensing device set at the front end of the soundproof door is started to prevent the experimenter from mistakenly entering the closed position of the soundproof door when the soundproof door is moving and closing. After the experiment is over, the deflation electromagnetic valve is first started to deflate. After deflation to normal atmospheric pressure, the pressure gauge outputs a signal, and the electric travel system of the soundproof door starts to open until it is in a fully open state. At the same time, the oxygen concentration alarm device is started, and it is in an alarm state when the oxygen concentration is lower than that. At this time, the experimenter should not enter the experimental area, and can enter only after the alarm state is lifted.

[0171] During the experiment, the valve is first opened and the pneumatic tube begins to inflate. When the pressure inside the pneumatic tube reaches a predetermined value, the valve is automatically closed and the pneumatic tube takes effect.

[0172] Embodiment 4

[0173] On the basis of the above-mentioned embodiment 3, Figure 10 and Figure 11 As shown, a guide mechanism 6 is installed at the top of the gate body 1 to further ensure the movement of the soundproof gate. The guide mechanism has the functions of guiding and positioning, and bears a certain lateral pressure, and cooperates with the walking mechanism to realize the opening and closing of the soundproof gate. The guide mechanism 6 includes a base 45, the base 45 is connected to the gate body 1, a shaft 43 is installed on the base 45, a bearing seat 41 is installed on the shaft 43, and a deep groove ball bearing 42 is sleeved on the bearing seat 41. The deep groove ball bearing has a small friction coefficient and mainly bears radial loads. It can also bear a certain amount of axial loads to achieve the effect of reducing friction resistance. Specifically, the parameters of the deep groove ball bearing are preferably an inner diameter of 75mm, an outer diameter of 160mm, a thickness of 37mm, a radial dynamic load rating of 76.8KN, and a radial static load rating of 113KN. A spacer sleeve 44 is sleeved between the bearing seat 41 and the deep groove ball bearing 42, an axis baffle 40 is installed on one side of the deep groove ball bearing 42, and a guide wheel bracket 39 is installed above the shaft 43, as shown in FIG. Figure 11 As shown, there are 8 groups of guide wheels, each group is evenly spaced and fixed to the gate body by bolts. The guide rails are preferably 125 channel steel, with one on each side of the guide wheel.

[0174] The present invention also proposes a method for installing a sealing airbag, wherein the original sealing airbag is removed:

[0175] First, remove the original sealed airbag of the soundproof door, and then remove the airbag seat. The removal work is carried out in sections. The removed sealed airbags and old airbag seats are piled up on site and handled uniformly later. After removal, the welding parts between the embedded parts and the airbag seat need to be polished; measurement and laying out: according to the design drawings, use a level and a tape measure to determine the position of the airbag seat, and pop up the horizontal and vertical lines of the airbag seat on the embedded parts on the wall. They must be straight and the deviation must not exceed ±5mm, and they must be corrected and checked; airbag seat installation: The airbag base is composed of a 4mm thick flat iron and a 10mm thick base plate. The flat iron installation is divided into two sections. One section of flat iron is welded and fixed to the embedded parts on the wall as the supporting structure of the airbag seat. The second section of flat iron is fixed to the first section of flat iron through waist-shaped hole bolts, and the horizontality and verticality of the airbag seat can be adjusted. The two ends of the base plate are welded and fixed to the two sections of flat iron. During the installation of the base plate, set a checkpoint at a certain distance, and use a level to check the horizontality and verticality of the airbag seat to ensure the flatness of the entire airbag base system. The gap between the base and the wall is filled with grouting material; Sealed airbag installation: Before installing the sealed airbag, an appearance inspection is required. After it is correct, the sealed airbag is unfolded along the airbag seat and temporarily fixed with a fixing fixture or adhesive to ensure that the length of the sealed airbag is compatible with the airbag seat. After the airbag is in place, first fix the middle pressure plate and then fix the pressure blocks on both sides with screws. During the fixing process, ensure that the sealed airbag has no wrinkles or twists. After the sealed airbag is installed, connect one end of the air pipe to the air nozzle of the sealed airbag, and the other end to the air source; Debugging: After the sealed airbag is installed, perform a door opening and closing test to observe whether the inflation and deflation of the sealed airbag are normal, as well as the adaptability and sealing of the sealed airbag during the opening and closing of the soundproof door. Adjust the air pressure of the sealed airbag according to the test results to achieve the best use state.

[0176] Embodiment 5

[0177] On the basis of the above-mentioned embodiment 3, an infrared sensing device (not shown in the figure) is provided at the front end of the soundproof door. When the soundproof door is closed and moved, the infrared sensing device provided at the front end of the soundproof door is activated to prevent the experimenter from mistakenly entering the closed position of the soundproof door when the soundproof door is moved and closed. After the experiment is over, the deflation electromagnetic valve is first activated to start deflation. After deflation to normal atmospheric pressure, the pressure gauge outputs a signal, and the electric travel system of the soundproof door starts to open until it is in a fully open state. At the same time, the oxygen concentration alarm device is activated. When the oxygen concentration is lower than that, it is in an alarm state. At this time, the experimenter should not enter the experimental area, and can enter only after the alarm state is lifted.

[0178] In the event of a power outage or other accidents in the electric walking mechanism, the system is equipped with a manual device to smoothly move the soundproof door away to ensure the normal operation of the soundproof door.

[0179] At the same time, bolt holes are reserved on the edge of the sound insulation door corresponding to the motor, which are used as the traction points of the hand winch during later maintenance.

[0180] The present invention also provides an installation method for the sound insulation door of a reverberation chamber, including on-site inspection and measurement → setting out lines → installing the lower track → leveling the guide rail → hoisting and positioning the bottom door frame → installing and positioning the side columns → hoisting and installing and positioning the sound insulation door modules in sequence → binding the transverse steel bars of the door panel → fixing the outer door panel → installing and positioning the top module of the door → pouring concrete → installing the upper guide wheel track of the sound insulation door → welding and fixing all joints of the sound insulation door → removing the positioning connecting parts between the sound insulation door and the airbag seat of the wall → performing an ultra-low speed trial operation on the sound insulation door → detecting the flatness → detecting the distance compliance between the sound insulation door and the wall → after passing the inspection, welding the transverse welds of the intermediate formwork of the sound insulation door → welding the vertical welds in the height direction → grinding the welds → welding the airbag seat → performing paint treatment → pasting the airbag → detecting the connection of the circuit and air circuit of the sound insulation door → performing a trial operation → operating.

[0181] Specifically, on-site inspection and measurement: Check and confirm the error of the completed surface of the civil engineering track. On-site inspection whether the transportation passage is blocked, whether the turnover site can meet the stacking needs, and whether the moving parts of the sound insulation door meet the needs of movement and debugging; Setting out: According to the horizontal control line, measure the ground elevation required by the design, and pop out the horizontal standard line on the surrounding walls. It should be straight, closed, and the deviation shall not exceed ±5 mm; Surveying and setting out: Since the allowable error in civil engineering construction is relatively large, and the installation construction of the sound insulation door requires high precision, it is not possible to completely rely on the horizontal baseline of civil engineering. It is necessary to re-measure from the reference axis and level point, and correct and compound. Determine the center line of the lower track of the sound insulation door and the center line of the top guide track according to the design drawings. Use a level, a standard tape measure, and a plumb line to draw out the final installation elevation line and vertical line; Install the lower track: Use a crane to hoist the ground track and place it in the trench of the reverberation room sound insulation door. Place it at the mid-span on both sides according to the measured center line of the ground track. Use a precision level to level the two tracks, and use the prepared adjustable galvanized sheet to level. The levelness is ±2 mm, and the two tracks are synchronously level ±1 mm. Fasten the embedded bolts of the track; Install the bottom door frame of the sound insulation door: Use a crane to lift the bottom door frame into the track trench, re-check the levelness of the bottom door frame, and connect the bottom door frame and the wall iron plate with channel steel, and weld firmly; Install the side columns of the sound insulation door: Use a crane to lift the left side column of the sound insulation door and place it on the bottom column. Use a level to control the verticality of the side column. The deviation within 6 meters is ±10 mm. Connect the side column and the embedded iron plate on the wall of the reverberation room with channel steel and weld firmly. Fix the right side column of the sound insulation door on the embedded iron plate on the wall of the reverberation room in the same way. The total width of the two side columns is ±10 mm; Hoist the sound insulation door module: Use a crane to lift the first door body plate of the sound insulation door into the side column of the sound insulation door. The divided span of the sound insulation door and the rabbet of the side column. Use bolts to adjust the concentricity of the bottom module of the sound insulation door in the side column. The gaps on both sides are uniform, and the module, side column, and bottom door frame are preliminarily fixed by electric welding. Lift in 2 more sound insulation door plates in the same way; Bind the horizontal steel bars of the sound insulation door: Horizontally bind the steel bars of the sound insulation door. Use binding wire to connect the structural steel bars on the inner liner and start binding from the bottom upwards. It is required that the entire circumference of the binding be fully tied, and the middle can be tied in a figure-eight skipping pattern; Fix the outer door panel: Fix the outer door panel. Use a crane to lift it into the edge groove of the door from above the door, and then closely fit it with the inner side wall of the edge binding and then fix it. Weld the middle outer plates to each other. After fixing, perform full welding; For the top door frame of the sound insulation door, use a crane to cover it on the side column of the sound insulation door, detect the misalignment variable ±5 mm, and weld the top door frame and the side column firmly; Concrete pouring: Use fine aggregate concrete for concrete pouring to meet the requirements of slump and fluidity. All concrete pouring openings are greater than or equal to 50 mm, and the maximum aggregate diameter of the concrete is less than or equal to 15 mm.The grade of the concrete shall be the strength grade required by the drawings; for the installation of the upper guiding track of the sound-insulating door, weld the track support on the embedded iron plate in the reverberation chamber. The distance between the lower plane of the channel steel and the guiding wheel at the top of the sound-insulating door is 20 mm. According to the center line of the upper track measured and marked in advance, weld the channel steel on the track support; weld the joints of the sound-insulating door, power on the motor of the sound-insulating door, run at a low speed, detect the change of the gap between the sound-insulating door and the reverberation chamber, and detect the flatness and perpendicularity of the sound-insulating door; welding between the door body and the door module: use a plug weld steel strip of 10*8 to fill the gap between the door frame and the door module. After all the gaps are filled, start welding the transverse weld; after the flatness of the sound-insulating door meets the requirements for installing the airbag, return the sound-insulating door to the mid-span position of the reverberation chamber opening, start welding, weld the transverse weld of the sound-insulating door, use a CO2 welding machine for welding. In order to reduce the deformation amount, two welders weld at the same position on both sides of the sound-insulating door at the same time. The welding direction is from the middle to both sides (first use intermittent welding and then full welding), from the center to the periphery, and from the bottom to the upper part; welding between the door body and the door module: use a plug weld steel strip to fill the gap between the door frame and the door module. After all the gaps are filled, start welding the transverse weld; use the process of welding both sides simultaneously to weld the vertical weld, grind the weld, remove the excess height of the door panel weld with a grinder on the sound-insulating door, and perform rust removal and grinding treatment before painting for the rest; install the airbag seat, weld the airbag seat on the embedded iron plates of the columns inside and outside the reverberation chamber. The gap between the airbag seat and the sound-insulating door is 15 mm ± 3 mm, weld the sealing plate of the airbag, open the air circuit interface, connect to the circuit control cabinet of the sound-insulating door for debugging and trial operation, and paint.

[0182] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reverberation chamber soundproof door, comprising a door body (1) and a ground rail (8), wherein the bottom of the door body (1) is connected to the ground rail (8), characterized in that: A walking mechanism is installed at the bottom end of the gate body (1), and the walking mechanism includes a driving wheel (4) and a driven wheel (5), the driving wheel (4) and the driven wheel (5) are installed at the two ends of the bottom of the gate body (1) respectively, a guide protrusion (48) is arranged in the ground rail (8), the driving wheel (4) and the driven wheel (5) are in contact with the top of the guide protrusion (48), a bracket (49) is installed at the bottom end of the gate body (1), a driving wheel box (20) is installed on the bracket (49), a mounting base (19) is installed at the top of the driving wheel box (20), and the mounting base (19) and the driving wheel box (20) are connected to each other. ) are connected by hexagonal bolts (16), the top of the mounting base (19) is connected to the bottom of the gate body (1), the driving wheel (4) and the driven wheel (5) are rotatably mounted in the driving wheel box (20), the front and rear ends of the driving wheel box (20) are equipped with steel plate brackets (47), the steel plate bracket (47) and the driving wheel box (20) are connected by set screws (18), a plurality of guide wheels (46) are installed at the bottom end of the steel plate bracket (47), the guide wheels (46) are located at the front and rear ends of the guide protrusion (48), and the front and rear end surfaces of the guide wheels (46) and the guide protrusion (48) are in contact.

2. The reverberation chamber soundproof door according to claim 1, characterized in that: A reduction motor (14) is installed on the bracket (49), a reinforcement member (15) is installed between the bracket (49) and the gate body (1), a gear box is connected to the bottom end of the reduction motor (14), a worm gear transmission is installed in the gear box, a transmission sprocket (23) is installed in the gear box, the transmission sprocket (23) is connected to the worm gear transmission, a driven sprocket (21) is sleeved on the driving wheel (4), and a chain (17) is installed between the transmission sprocket (23) and the driving wheel (4).

3. The reverberation chamber soundproof door according to claim 2, characterized in that: A driven axle (27) is installed in the driving wheel box (20), and axle clamping plates (29) are installed on both sides of the driven axle (27). The axle clamping plates (29) are connected to the driving wheel box (20). The driving wheel (4) and the driven sprocket (21) are both installed on the driven axle (27). The driven sprocket (21) is connected to the driving wheel (4) through a hinged bolt (22). A shaft sleeve (26) is installed on the other side of the driving wheel (4). A transparent cover (24) is sleeved on the shaft sleeve (26). The transparent cover (24) and the driving wheel (4) are installed with hexagonal bolts (16). A felt seal (25) is installed between the transparent cover (24) and the shaft sleeve (26).

4. The reverberation chamber soundproof door according to claim 3, characterized in that: A spherical roller bearing (31) is sleeved between the driven axle (27) and the driving wheel (4), a lubrication channel is provided in the driven axle (27), a straight-through pressure injection oil cup (28) is installed at one end of the lubrication channel, the straight-through pressure injection oil cup (28) is installed on the axle clamping plate (29), a distance ring (32) is installed in the spherical roller bearing (31), and a guide wheel component (33) is also installed on the driving wheel box (20), and the guide wheel component (33) is engaged with the chain (17).

5. The reverberation chamber soundproof door according to claim 1, characterized in that: Sealing mechanisms (7) are installed at both ends of the top of the gate body (1).

6. The reverberation chamber soundproof door according to claim 5, characterized in that: The sealing mechanism (7) comprises a sealing airbag (34), the gate body (1) is movably embedded in the reverberation chamber cavity (35), an airbag seat (36) is installed in the reverberation chamber cavity (35), adjusting flat irons (38) are installed on both sides of the airbag seat (36), the sealing airbag (34) is installed on the airbag seat (36), and steel plate pressure plates (37) are installed on both sides of the airbag seat (36).

7. The reverberation chamber soundproof door according to claim 1, characterized in that: A guide mechanism (6) is installed on the top of the gate body (1).

8. The reverberation chamber soundproof door according to claim 6, characterized in that: The guide mechanism (6) comprises a base (45), the base (45) is connected to the gate body (1), a shaft (43) is mounted on the base (45), a bearing seat (41) is mounted on the shaft (43), a deep groove ball bearing (42) is sleeved on the bearing seat (41), a spacer sleeve (44) is sleeved between the bearing seat (41) and the deep groove ball bearing (42), a shaft baffle (40) is mounted on one side of the deep groove ball bearing (42), and a guide wheel bracket (39) is mounted above the shaft (43).

9. The reverberation chamber soundproof door according to claim 1, 6 or 8, characterized in that: A maintenance ladder (3) is installed on one side of the gate body (1), and a ladder handrail (9) is installed on the maintenance ladder (3).

10. The reverberation chamber soundproof door according to claim 9, characterized in that: The gate body (1) comprises a door body component (12), side column components (10) are installed on both sides of the door body component (12), a door bottom component (13) is installed at the bottom of the door body component (12), and a door top component (11) is installed on the top of the door body component (12), and the door body component (12) comprises a plurality of modules (2).

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