JP2009030614A - Cooling device of work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device of a work machine having a sound insulating straightening plate adaptable to a difference in the type and operating conditions of the work machine. <P>SOLUTION: An upper cover 3a is provided above a cooling package 21 provided with a heat exchanger 11 and a cooling fan 12. A side door 3b is provided on one side part of the upper cover 3a oppositely to the cooling package 21. An upper air suction hole 6 is opened in the upper cover 3a between the side door 3b and the cooling package 21, and a side air suction hole 7 is opened in the side door 3b at the upper part adjacent to the upper cover. The sound insulating straightening plate 27 is rotatable through a hinge 26 arranged between the upper air suction hole 6 and the side air suction hole 7. A control panel 44 controls an actuator 41 according to temperature information from a temperature sensor 42 for detecting the temperature information of the cooling package 21 for controlling the angle of the sound insulating straightening plate 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling device for a work machine having a cooling package including at least a radiator heat exchanger for cooling an engine and a cooling fan.

  As shown in FIG. 8, the hydraulic excavator as a work machine is provided with a lower swinging body 1 so that an upper swinging body 2 can swing via a swing bearing portion, and the upper swinging body 2 is covered with a cover 3. The cab 4 and the front working device 5 are further mounted.

  An upper intake hole 6 is opened in the upper cover 3a fixed to one side of the cover 3, and a side intake hole 7 is opened in the upper part of the side door 3b attached to the upper cover 3a so as to be freely opened and closed. Has been.

  As shown in FIG. 9, the power chamber in the cover 3 includes a cooling package in which a heat exchanger 11 such as a radiator and an oil cooler and a cooling fan 12 are integrated, an engine 13, a hydraulic pump 14, a muffler 15, and the like. Equipment related equipment is provided.

  Then, in order to cool the engine 13 and the like, the cooling air (outside air) flowing in from the upper intake hole 6 and the side intake hole 7 is passed through the heat exchanger 11 of the cooling package by the cooling fan 12, and the engine 13 and It passes through the side of the hydraulic pump 14 and is discharged to the outside through an exhaust hole 16 formed on the muffler 15 side of the cover 3.

  As shown in FIG. 10, there is no shielding between the upper intake hole 6 of the upper cover 3a and the side intake hole 7 of the side door 3b and the engine 13 and its auxiliary equipment. Therefore, these internally generated sounds (engine sounds and fan sounds) indicated by dotted arrows are directly emitted from the intake holes 6 and 7 to the outside, which may increase ambient noise.

  In addition, the inflow of the cooling air indicated by the solid arrows flowing in from the upper intake hole 6 and the side intake holes 7 collides with the area A on the front surface of the heat exchanger 11 of the cooling package and mixes to generate turbulent flow. In addition, the cooling air suction efficiency may be reduced.

  Therefore, the upper and lower intake holes that allow the cooling air to flow into the engine cover are provided on the upper and lower surfaces of the engine cover without providing the intake holes on the sides, and heat is exchanged for the cooling air that flows from the upper and lower intake holes. There is a cooling device having a configuration in which upper and lower air ducts are respectively guided to the front surface of the vessel 11 (see, for example, Patent Document 1).

  The configuration described in Patent Document 1 does not have air intake holes on the sides, so the air flow intake efficiency of the cooling fan is reduced, and therefore upper and lower air guide ducts communicating with the upper and lower air intake holes are provided. It is necessary to make the upper and lower air ducts have a rectifying function so that the cooling air flowing in from them does not mix, and the structure is complicated. Moreover, since the lower intake hole is opened above the crawler belt of the lower traveling body, there is a possibility that earth and sand or dust carried to the upper portion of the crawler belt may be sucked.

On the other hand, as shown in FIG. 11, the sound insulation rectifying plate 17 is attached to the front surface of the heat exchanger 11 of the cooling package at a predetermined fixed angle of 45 ° or more with respect to the horizontal plane, and the upper intake hole of the upper cover 3a. 6 and the side air inlet 7 of the side door 3b have a structure in which the front surface of the heat exchanger 11 cannot be directly viewed from the openings, thereby suppressing an increase in ambient noise due to leakage of engine sound and cooling fan sound, and upper air intake hole. Proposals have been made to prevent the cooling air flowing in from the respective 6 and side intake holes 7 from colliding with the front surface of the heat exchanger 11 and becoming turbulent, thereby reducing the cooling air intake efficiency.
JP 2000-16094 A (page 4-5, FIG. 2)

  In FIG. 11, the ratio of the intake amount of the intake air 18 taken in from the upper intake hole 6 of the upper cover 3a and the intake air 19 taken in from the side intake hole 7 of the side door 3b, the intake speed, Since the suction angle and the like are remarkably different depending on the body shape, performance, operating conditions, and the like of the hydraulic excavator model, the mounting angle of the sound insulation rectifying plate 17 is various.

  In other words, the optimum mounting angle of the sound insulation rectifying plate 17 according to the shape and performance of each model is diverse, and furthermore, even the equivalent aircraft has different intake suction amount and suction angle depending on the operating conditions, The conventional fixed sound insulation rectifying plate 17 cannot be used.

  If the mounting angle of the fixed sound insulation rectifying plate 17 is not suitable, the sound insulation rectifying plate 17 serves as a suction resistance for cooling air, the intake-side pressure loss increases, and the intake efficiency deteriorates. On the other hand, the calculation of the mounting angle of the sound insulation rectifying plate 17 which would be suitable also has a problem that enormous analysis time occurs.

  This invention is made in view of such a point, and it aims at providing the cooling device of the working machine which has a sound-insulation rectifying plate which can respond to the difference in the model and working condition of a working machine.

  The invention described in claim 1 is a cooling package including a heat exchanger and a cooling fan, an upper cover provided above the cooling package, and a side provided on one side of the upper cover so as to face the cooling package. A side cover, an upper intake hole opened between the side cover and the cooling package in the upper cover, a side intake hole opened in the upper part adjacent to the upper cover in the side cover, and an upper intake hole A sound-insulating rectifying plate that is movably provided between the air-intake and the side air-intake holes and insulates internally generated sound and rectifies the intake air sucked from the upper air-intake holes and the side air-intake holes; The temperature sensor for detecting the temperature information of the cooling package, and the angle of the sound insulation rectifying plate by controlling the actuator based on the temperature information from the temperature sensor. A working machine cooling device and a control means for controlling.

  According to a second aspect of the present invention, there is provided the work machine cooling apparatus according to the first aspect, further comprising a rotating shaft portion disposed between the upper intake hole and the side intake hole, and the sound insulating rectifying plate is rotated. The shaft is pivotally supported by the shaft.

  According to a third aspect of the present invention, a plurality of sound insulation rectifying plates are provided in the work machine cooling device according to the first or second aspect.

  The invention according to claim 4 is a side door in which the side cover in the cooling device for the work machine according to claim 1 or 2 is provided so as to be openable and closable, and the sound insulation rectifying plate is attached to the side door. It is what was done.

  According to the first aspect of the present invention, the balance of the wind pressure acting on the sound insulation rectifying plate from the air flow sucked from the upper intake hole of the upper cover and the air flow sucked from the side intake hole of the side cover. Therefore, the sound insulation rectifying plate is automatically determined in a state most suitable for rectifying each air flow, that is, the air pressure acting on the sound insulation rectifying plate is equalized by the air sucked from each intake hole. Therefore, the sound insulation rectifying plate prevents the flow of cooling air from being obstructed and does not increase the pressure loss, so that smooth and efficient intake can be performed. The rectifying effect is obtained by preventing the intake air from the upper intake hole of the upper cover and the intake air from the side intake hole of the side cover from directly colliding with each other to form a turbulent flow. In addition, the sound insulation rectifying plate can automatically cope with the difference in the type and operating conditions of the work machine, and further, the wind pressure acting from the air flow sucked from the upper intake hole and the air sucked from the side intake hole The sound generation rectifying plate located in a good balance with the wind pressure acting from the air flow blocks the internally generated sound that leaks from the front surface of the cooling package, so that the noise leaking to the surroundings can be reduced, and Based on the temperature of the cooling package detected by the temperature sensor, the control means operates the sound insulation rectifying plate by the actuator, and the intake air flow rate or the intake air sucked from the upper intake hole of the upper cover or the side intake hole of the side cover. By adjusting the route, it is possible to cope with changes in the operating conditions of the work machine.

  According to the second aspect of the present invention, since the sound insulating rectifying plate is pivotally supported by the rotating shaft portion, the mounting structure of the sound insulating rectifying plate can be simplified.

  According to the third aspect of the present invention, the rectifying effect can be improved by the plurality of sound insulating rectifying plates.

  According to the fourth aspect of the present invention, since the sound insulation rectifying plate attached to the side door is moved away from the cooling package by opening the side door that opens outward, the cooling package is not affected by the sound insulation rectifying plate. Maintenance work can be facilitated.

  The present invention will be described below with reference to various embodiments shown in FIGS. 5 to FIG. 7 are prerequisite technologies which are the premise of the cooling device shown in FIG. 1, and the hydraulic excavator as the work machine shown in FIG. 8 is also referred to in the description of the present invention. Therefore, the same reference numerals are assigned to portions corresponding to the respective portions in FIG.

  Based on FIG. 5 thru | or FIG. 7, the premise technique of the cooling device of a hydraulic shovel is demonstrated.

  As shown in FIG. 5, a cooling package 21 including a heat exchanger 11 such as a radiator for cooling the engine and a cooling fan 12 is installed in the cooling device chamber 20 of the excavator, and is covered with the cover 3 together with the engine 13. It has been broken. The cover 3 includes an upper cover 3a provided above the cooling package 21 and a side door 3b as a side cover provided on one side of the upper cover 3a so as to face the cooling package 21. .

  As shown in FIG. 6, with respect to the fixed upper cover 3a, the side door 3b is attached to a support member 22 provided on the back side of the cab 4 by a plurality of hinges 23 arranged in the vertical direction. It is provided so that it can be opened and closed freely. An engine intake filter 24 is disposed in the vicinity of the cooling package 21. In FIG. 6, 25 is a counterweight.

  The cooling package 21 has an oil cooler heat exchanger 11oi that cools hydraulic oil in the hydraulic circuit on a relatively lower side in front of FIG. 6 with respect to the radiator heat exchanger 11ra that cools the cooling water of the engine 13. Furthermore, a condenser 11co of an air conditioning circuit is disposed on the front side of FIG. 6 with respect to the heat exchanger 11oi of the oil cooler, and a relatively upper side of FIG. 6 is disposed on the relatively upper side with respect to the radiator heat exchanger 11ra. An aftercooler heat exchanger 11af for cooling engine intake air compressed by the turbocharger is disposed on the side, and a cooling fan 12 is disposed on the engine 13 side of the radiator heat exchanger 11ra.

  As shown in FIGS. 5 to 7, the upper cover 3a is provided with a plurality of upper intake holes 6 between the side door 3b and the cooling package 21, while the side cover 3b has an upper cover 3a. A plurality of side air intake holes 7 are opened in a portion adjacent to.

  On the lower surface of the upper cover 3a, a base end of the sound-insulating rectifying plate 27 is pivoted by a pair of hinges 26 serving as pivot shafts disposed between the upper suction holes 6 and the side suction holes 7. It is supported.

  This sound insulation rectifying plate 27 is inclined by a balance between the wind pressure of the intake air from the upper intake hole 6 which is the opening above the fuselage and the wind pressure of the intake air from the side intake hole 7 which is the opening of the side door 3b. The angle is movable, and the internally generated sound (engine sound, fan sound) that leaks out from the upper intake hole 6 and the side intake hole 7 is sound-insulated, and the suction from the upper intake hole 6 and the side intake hole 7 It works to rectify rare inhaled air.

  In FIG. 7, on the side opposite to the hinge 23 of the side door 3b, a door opening / closing handle 28 and a door closing portion 29 such as a magnet and a locking portion are provided.

  In FIG. 5, the air sucked from the suction hole 30 a provided on the side surface of the cover 3 is also sucked into the cooling package 21.

  Next, the function and effect of the base technology shown in FIGS. 5 to 7 will be described.

  By providing the sound insulation rectifying plate 27 movably around the hinge 26 disposed between the upper intake hole 6 and the side intake hole 7, the air flow sucked from the upper intake hole 6 of the upper cover 3a can be reduced. The angle of the sound insulation rectifying plate 27 is most suitable for rectifying each air flow due to the balance of wind pressure acting on the sound insulation rectifying plate 27 from the air flow sucked from the side air intake holes 7 of the side door 3b. The tilt is automatically determined.

  That is, since the air pressure sucked from the intake holes 6 and 7 can equalize the wind pressure acting on the sound insulation rectifying plate 27, the sound insulation rectifying plate 27 inhibits the intake flow of the cooling air. There is no increase in pressure loss, and smooth and efficient intake can be performed.

  Further, at this time, the sound insulation rectifying plate 27 causes the intake air from the upper intake hole 6 of the upper cover 3a and the intake air from the side intake hole 7 of the side door 3b to directly collide with each other to generate a turbulent flow. By preventing this, a rectifying effect can be obtained, and the sound insulating rectifying plate 27 can automatically cope with differences in hydraulic excavator models and operating conditions.

  Furthermore, the sound insulation rectifying plate 27 inclined in a well-balanced manner by the wind pressure acting from the air flow sucked from the upper intake hole 6 and the wind pressure acting from the air flow sucked from the side intake hole 7 provides a cooling package. Since the engine sound and fan sound leaking from the front surface of the 21 heat exchangers 11 are blocked, it is possible to reduce the noise leaking to the surroundings.

  Next, FIG. 1 shows a first embodiment of a cooling device. The same parts as those in FIGS. 5 to 7 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 1, a cooling package 21 is covered with an upper cover 3a and a side door 3b, an upper intake hole 6 is opened in the upper cover 3a, and a side intake hole 7 is opened in the side door 3b. On the lower surface of the upper cover 3a, a sound insulation rectifying plate 27 is rotatably provided by a hinge 26 serving as a rotation shaft portion disposed between the upper intake hole 6 and the side intake hole 7.

  An actuator 41 such as a solenoid that rotates the sound insulation rectifying plate 27 about the hinge 26 is pivotally supported between the upper cover 3a and the sound insulation rectifying plate 27.

  The cooling package 21 is provided with a temperature sensor 42 for detecting temperature information such as the engine coolant temperature of the radiator and the hydraulic circuit hydraulic oil temperature of the oil cooler, and the engine 13 detects the temperature in the engine 13. A temperature sensor 43 is provided. The temperature sensor 42 may be installed in a pipe through which engine coolant or hydraulic oil flows.

  These temperature sensors 42 and 43 are connected to a control panel 44 serving as a control means. The control panel 44 controls the actuator 41 based on the temperature information from the temperature sensors 42 and 43 to adjust the angle of the sound insulation rectifying plate 27. Control.

  The control panel 44 is connected to an accelerator dial for setting the no-load rotation speed of the engine 13, an engine rotation speed sensor (not shown), etc., and obtains the rotation speed information of the cooling fan 12 from these, and The angle of the sound insulation rectifying plate 27 may be controlled by controlling the actuator 41 based on the cooling fan rotation speed information.

  Next, the function and effect of the first embodiment shown in FIG. 1 will be described.

  When the engine coolant temperature detected by the temperature sensors 42 and 43, the hydraulic circuit hydraulic oil temperature, the temperature in the engine 13 and the like are low, the control panel 44 uses the actuator 41 to connect the sound insulation rectifying plate 27 and the two-dot chain line in FIG. As shown in Fig. 2, the side door 3b is turned in the direction of closing the side air intake hole 7 to provide resistance by causing turbulence in the air flow sucked in a large amount from the side air intake hole 7. Thus, the cooling capacity of the cooling package 21 is limited so as not to overcool, and an efficient warm-up operation is performed.

  On the other hand, when the engine cooling water temperature, the hydraulic circuit hydraulic oil temperature, the temperature in the engine 13 and the like detected by the temperature sensors 42 and 43 rise, the control panel 44 stops the warm-up operation as described above and performs sound insulation. The rectifying plate 27 is controlled to the inclined state shown by the solid line in FIG.

  At this time, the inclination angle of the sound insulation rectifying plate 27 is controlled by an actuator 41 such as a solenoid in accordance with a change in operating conditions of the hydraulic excavator, and the air flow sucked from the upper intake hole 6 of the upper cover 3a and the side door The sound insulation rectifying plate 27 is automatically controlled so that the air flow sucked from the side intake holes 7 of 3b is smoothly supplied to the high temperature portion of the cooling package 21.

  For example, when the hydraulic circuit hydraulic oil temperature rises significantly due to heavy load work of the hydraulic excavator, the sound insulation rectifying plate 27 is set to an inclination angle upward from the standard inclination angle in order to increase the cooling efficiency of the oil cooler located below. Automatic adjustment is performed to guide the air flow sucked from the side intake holes 7 to the lower side of the cooling package 21.

  Further, the sound insulation rectifying plate 27 prevents the intake air from the upper intake hole 6 of the upper cover 3a and the intake air from the side intake hole 7 of the side door 3b from directly colliding with each other to generate a turbulent flow. Thus, a rectifying effect can be obtained. Thereby, the suction flow of the cooling air is not hindered and the pressure loss does not increase, and smooth and efficient intake can be performed.

  Further, the engine sound leaks to the outside from the front surface of the heat exchanger 11 of the cooling package 21 through the upper intake holes 6 and the side intake holes 7 by the sound insulation rectifying plate 27 controlled to the inclined state shown by the solid line in FIG. Since the fan sound is cut off, it is possible to reduce noise leaking to the surroundings.

  The sound insulation rectifying plate 27 may be pivotally supported so that two sheets can be stacked, and these sound insulation rectifying plates 27 may be installed so that they can be rotated separately by the respective actuators 41. In that case, by controlling the one sound insulating rectifying plate 27 to block the upper intake hole 6 and the other sound insulating rectifying plate 27 to block the side intake hole 7, a more efficient warm-up operation can be performed.

  Next, FIG. 2 shows a second embodiment. In addition, the same code | symbol is attached | subjected to the part similar to FIG. 1, and the description is abbreviate | omitted.

  Temperature that detects temperature information of the cooling package 21 and the engine 13, and an actuator 41 such as a solenoid that rotates a plurality of sound-insulating rectifying plates 27 via an interlocking link 36 with a plurality of hinges 26 and 26a serving as pivot shafts as fulcrums Sensors 42 and 43 and a control panel 44 as control means for controlling the actuator 41 based on temperature information from the temperature sensors 42 and 43 and controlling the angles of the plurality of sound insulation rectifying plates 27 are provided.

  Then, the control panel 44 detects a change in the operating condition of the hydraulic excavator based on the temperature information from the temperature sensors 42 and 43, controls the inclination angle of the sound insulation rectifying plate 27 by the actuator 41, and controls the upper intake of the upper cover 3a. A plurality of sound insulation rectifying plates 27 are automatically controlled so that the airflow sucked from the holes 6 and the airflow sucked from the side air intake holes 7 of the side door 3b are smoothly supplied to the high temperature portion of the cooling package 21. To do. At that time, the plurality of sound insulation rectifying plates 27 can improve the rectifying effect on the intake air from the upper intake hole 6.

  Next, FIG. 3 shows a third embodiment. Parts similar to those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  In the embodiment shown in FIG. 3, as shown in FIG. 6, the sound insulation rectifying plate 27 is rotated via a hinge 26 in the side air intake hole 7 of the side door 3b that is open and can be opened and closed. An actuator 41 such as a solenoid is pivotally supported between the sound insulation rectifying plate 27 and the upper end of the side door 3b.

  Further, the temperature sensors 42 and 43 for detecting the temperature information of the cooling package 21 and the engine 13 and the angle of the plurality of sound insulation rectifying plates 27 are controlled by controlling the actuator 41 based on the temperature information from the temperature sensors 42 and 43. And a control panel 44 as control means.

  Then, since the sound insulation rectifying plate 27 is attached to the side door 3b which is opened outwardly, the sound insulation rectifying plate 27 attached to the side door 3b is opened by opening the side door 3b as shown in FIG. It can be kept away from the cooling package 21. Therefore, the maintenance work of the cooling package 21 in the cooling device chamber 20, for example, the cleaning of the radiator heat exchanger 11ra, can be facilitated without being disturbed by the sound insulation rectifying plate 27.

  FIG. 4 shows an example of the control in the embodiment shown in FIG. 3. At the start, the sound insulation rectifying plate 27 provided in the side intake hole 7 of the side door 3b is kept closed. (Step 1).

  When the engine 13 is started (step 2), the control panel 44 determines whether or not the engine coolant temperature detected by the temperature sensor 42 is higher than the set temperature (step 3), and while the detected temperature is lower than the set temperature. (Step 3 NO), it is determined that the engine 13 has not been warmed up, the sound insulation rectifying plate 27 is kept closed, and the cooling capacity of the cooling package 21 is reduced by reducing the amount of air sucked into the cooling device chamber 20. Continue warm-up operation by limiting

  On the other hand, when the engine coolant temperature detected by the temperature sensor 42 becomes higher than the set temperature (YES in step 3), the control panel 44 determines that the engine 13 has been warmed up and displays the sound insulation rectifying plate 27 by the actuator 41. 3 is driven to a control state indicated by a solid line (step 4).

  In this way, based on the temperature of the cooling package 21 detected by the temperature sensor 42, the control panel 44 rotates the sound insulation rectifying plate 27 by the actuator 41 and is sucked from the side intake holes 7 of the side door 3b. By variably adjusting the intake flow rate or the intake path, it becomes possible to cope with changes in the operating conditions of the hydraulic excavator.

  Similarly, the control panel 44 rotates the sound insulation rectifying plate 27 by the actuator 41 to variably adjust the intake flow rate or the intake path sucked from the upper intake hole 6 of the upper cover 3a. It is also possible to respond to changes in

  In each of the illustrated embodiments, the sound insulation rectifying plate 27 is pivotally supported by a hinge 26 as a pivot shaft portion disposed between the upper intake hole 6 and the side intake hole 7. Therefore, the mounting structure of the sound insulation rectifying plate 27 is simplified, but in some cases, the sound insulation rectifying plate 27 is guided and slidably moved between the upper intake hole 6 and the side intake hole 7 to be movable. It may be provided.

  The present invention can be applied not only to a hydraulic excavator but also to a cooling device for other work machines such as a bulldozer and a loader.

It is sectional drawing which shows 1st Embodiment of the cooling device of the working machine which concerns on this invention. It is sectional drawing which shows 2nd Embodiment of a cooling device same as the above. It is sectional drawing which shows 3rd Embodiment of a cooling device same as the above. It is a flowchart which shows the control procedure of a cooling device same as the above. It is sectional drawing which shows the premise technique of a cooling device same as the above. It is a perspective view of the power plant which concerns on a premise technique same as the above. It is a perspective view of the side cover which concerns on a base technology same as the above. It is a perspective view which shows the hydraulic shovel as a working machine. It is sectional drawing of the power unit of a hydraulic excavator same as the above. It is sectional drawing which shows the prior art example of the intake part structure with respect to the cooling package of a power unit same as the above. It is sectional drawing which shows the example of improvement of an intake part structure same as the above.

Explanation of symbols

3a Upper cover
3b Side door as side cover 6 Upper intake hole 7 Side intake hole
11 Heat exchanger
12 Cooling fan
21 Cooling package
26 Hinge as rotating shaft
27 Sound insulation rectifying plate
41 Actuator
42 Temperature sensor
44 Control panel as control means

Claims (4)

A cooling package with a heat exchanger and a cooling fan;
An upper cover provided above the cooling package;
A side cover provided on one side of the upper cover facing the cooling package;
An upper intake hole opened between the side cover and the cooling package at the upper cover;
A side intake hole that is open at the top adjacent to the upper cover at the side cover;
A sound-insulating rectifying plate that is movably provided between the upper intake hole and the side intake hole and that shuts off internally generated sound and rectifies the intake air sucked from the upper intake hole and the side intake hole;
An actuator that operates the sound insulation rectifying plate;
A temperature sensor for detecting temperature information of the cooling package;
And a control means for controlling the angle of the sound insulation rectifying plate by controlling the actuator based on temperature information from the temperature sensor. A rotating shaft portion disposed between the upper intake hole and the side intake hole,
The cooling device for a work machine according to claim 1, wherein the sound insulating rectifying plate is pivotally supported by the pivot shaft portion. The cooling device for a work machine according to claim 1, wherein a plurality of sound insulation rectifying plates are provided. The side cover is a side door that is open and can be opened and closed.
The cooling device for a work machine according to claim 1 or 2, wherein the sound insulation rectifying plate is attached to the side door.

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