CN111006268B - Decoration cover mounting device and range hood applying same - Google Patents

Abstract

The invention discloses a decorative cover mounting device, which is characterized in that: including first support arm, second support arm, be used for driving first support arm and second support arm be close to each other and keep away from the drive arrangement who removes on the ground on horizontal, first support arm and second support arm are transversely extended, the tip that first support arm and second support arm kept away from each other is used for supporting respectively and decorates cover relevant position. A range hood applying the mounting device is also disclosed. Compared with the prior art, the invention has the advantages that: through breaking away from the installation device that decorates the cover and set up alone, adopt mobilizable support arm to support and the lift decorates the installation that the cover accomplished the decoration cover, can adapt to the decoration cover of split type and integral type, the commonality is wider, and the cover convenient and fast is decorated in the dismouting, and the installation is simple reliable, can realize decorating cover and furred ceiling seamless connection.

Description

Decoration cover mounting device and range hood applying same

Technical Field

The invention relates to an oil fume purification device, in particular to a decoration cover installation device and a range hood applying the installation device.

Background

The decoration cover of range hood is used for sheltering from the air-out cover and the air-out pipe at range hood top, plays pleasing to the eye, decorative effect, and the decoration cover can be taken out from range hood's top usually, carries out height control according to the height in user's house. The decoration cover is generally divided into a lower decoration cover fixed to the case and an upper decoration cover capable of being drawn out and drawn up and down, and the upper decoration cover is generally disposed inside the lower decoration cover for aesthetic and safety reasons. The lower decorative cover is divided into two different forms: 1. the split type lower decorative cover can be fixed on the box body after the range hood is installed, usually, screws are exposed, and the range hood has the characteristics of poor attractiveness, integrity and installation firmness, but is simple and convenient to install; 2. the integrated lower decorative cover is integrally connected or formed with the range hood box body, not only has a decorative function, but also generally has a use function, for example, a switch or a lamp is arranged on the lower decorative cover; the integrated lower decorative cover is generally used for a high-end range hood and is characterized in that the lower decorative cover cannot be mounted later and is integrally connected with the whole range hood, so that the upper decorative cover can only be pulled from bottom to top.

The existing drawable decorative cover has the following problems: 1. the gap between the decorative cover and the suspended ceiling is too large, and the appearance is influenced. 2. Before the decorative cover is installed, the shell of the range hood needs to be dismantled firstly, and the installation is inconvenient. 3. The decoration cover is connected with the hook or the wall from the outer surface of the decoration cover in a screw driving mode, and the appearance of the whole machine is damaged. 4. When the smoke tube shielded by the decorative cover needs to be cleaned or the electric part shielded by the decorative cover needs to be repaired, the shell of the range hood needs to be detached firstly, and the disassembly is inconvenient.

The applicant's chinese patent application No. 201610444600.6 discloses a mounting structure of a decorative cover of a range hood, and provides a mounting structure of a decorative cover of a range hood, which is convenient to mount and can realize seamless connection between the decorative cover and a ceiling. In the actual product application process, the mounting structure has the following problems: 1. the requirement on the installation precision of the hook is high: in vertical direction, the distance between couple and the furred ceiling needs to be measured and fix according to the designing requirement through installer, then decorates the unable installation of cover if the couple installation is on the high side, then decorates cover and furred ceiling and have the clearance if on the low side, influences beautifully. 2. Easy falling: because the structure is that the spring bolt is connected with the surface of the hook, if the hook is installed to the left or the right, the size of the contact surface between the spring bolt and the hook support is directly influenced. The motor of the range hood has self-excited vibration phenomenon in the high-speed operation process, and the impeller of the range hood has certain dynamic balance deviation under the influence of the manufacturing process and the use condition of a user, so that the range hood has small vibration in the use process. The long-term vibration accumulation causes the latch bolt and the hook to shift left or right or forward until the two are separated, resulting in the decorative cover falling off. 3. The front end of the lock tongue is exposed, which affects the beauty.

In order to realize seamless installation, chinese patent with application number 201610608530.3 discloses a range hood decorative cover lifting mechanism applied to the technical field of range hood parts, a fixing plate of the range hood decorative cover lifting mechanism is installed on a wall surface, a V-shaped left crank arm is installed on a left mounting plate, a V-shaped right crank arm is installed on a right mounting plate, one end of the left crank arm is connected with a left bracket of a decorative cover, one end of the right crank arm is connected with a right bracket of the decorative cover, a left crank arm tension spring is installed between the left crank arm and the left mounting plate, and a right crank arm tension spring is installed between the right crank arm and the right mounting plate.

As is known from the mounting process disclosed in the above patent document, the left/right support frame is mounted from front to back through the upper decorative cover, and the left/right crank arm head is rotated by pulling the left/right crank arm head, thereby mounting the decorative cover. That is, this mounting structure is applicable only to the above-described trim cover of the form 1, but is not applicable to the trim cover of the form 2; the decorative cover is only suitable for one size type of decorative cover, if the decorative cover is widened or narrowed, the decorative cover cannot be installed, and the decorative cover needs to be adjusted again according to the specific size of the decorative cover; although automatic installation can be realized through the extension spring in the installation, when decorating the cover and needing to dismantle, the extension spring has nevertheless become the resistance source of dismantling, leads to dismantling the difficulty.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a decoration cover installation device aiming at the defects of the prior art, so that the installation universality is improved, and the seamless connection between the decoration cover and the suspended ceiling is realized.

The second technical problem to be solved by the invention is to provide a range hood applying the mounting device.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a decorate cover installation device which characterized in that: including first support arm, second support arm, be used for driving first support arm and second support arm be close to each other and keep away from the drive arrangement who removes on the ground on horizontal, first support arm and second support arm are transversely extended, the tip that first support arm and second support arm kept away from each other is used for supporting respectively and decorates cover relevant position.

The height of cover is decorated in order to further realize seamless installation for automatic lifting in the removal in-process of support arm, the one end that the second support arm was kept away from to first support arm is provided with first regulating block, the one end that first support arm was kept away from to the second support arm is provided with the second regulating block, the top surface of first regulating block is by being close to first support arm department to the direction of keeping away from first support arm downward sloping gradually, and the top surface of second regulating block is by being close to second support arm department to the direction of keeping away from the second support arm downward sloping gradually.

For further improving the commonality, be applicable to the decoration cover of different wall thicknesses, first regulating block rotates with first support arm to be connected, the second regulating block rotates with the second support arm to be connected, first regulating block and second regulating block homoenergetic are at vertical in-plane rotation.

In order to effectively prevent the problem that the gap between the front surface of the decorative cover and the suspended ceiling is too large due to the gravity center shift of the decorative cover, the first supporting arm and the second supporting arm are respectively provided with two supporting arms, the two supporting arms are parallel to each other, and the two supporting arms are connected with each other through a first connecting rod; the two second supporting arms are parallel to each other and connected with each other through a second connecting rod.

In order to reduce the friction force between the support arm and the suspended ceiling when the support arm moves, the suspended ceiling support device further comprises a first ball and a second ball, wherein the first ball is partially arranged in the first support arm and at least partially exposed out of the top of the first support arm, and the second ball is partially arranged in the second support arm and at least partially exposed out of the top of the second support arm.

In order to facilitate the movement of the supporting arm driven by the driving device, the supporting device further comprises a transmission device, a first supporting rod and a second supporting rod which are connected with the driving device, the first supporting rod and the second supporting rod are arranged side by side at intervals and extend longitudinally, the first supporting rod is arranged on the first supporting rod, the second supporting rod is arranged on the second supporting rod, and the first supporting rod and the second supporting rod are respectively connected with the transmission device and can move transversely close to each other and far away from each other.

Preferably, the transmission device comprises a first gear driven by the driving device to rotate, a second gear meshed with the first gear, and a screw rod penetrating through the second gear and fixedly connected with the second gear, the first support rod is in threaded connection with the screw rod, and the second support rod is in threaded connection with the screw rod.

For the convenience of fixing and installing the device, the device further comprises a shell, the driving device is arranged in the shell, two ends of the screw rod are rotatably connected with the inside of the shell, and a support used for being connected and fixed with an external installation base is arranged on the shell.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides an be applied to there is above range hood, including decorating the cover, decorate the cover including the cover body, the cover body includes left side wall and right side wall, its characterized in that: and flanges matched with the end parts of the corresponding supporting arms are respectively formed on the inner sides of the tops of the left side wall and the right side wall.

To ensure seamless connection of the trim cover to the ceiling, when the mounting device has a first ball and a second ball, the height of each ball exposed to the respective support arm is less than the thickness of the flange of the trim cover.

Compared with the prior art, the invention has the advantages that: the installation device is separated from the decoration cover and is independently arranged, the decoration cover is supported and lifted by the movable supporting arm to complete the installation of the decoration cover, the decoration cover can adapt to split type and integrated type decoration covers, the universality is wider, the decoration cover can be conveniently and quickly disassembled and assembled, the installation is simple and reliable, and the seamless connection between the decoration cover and a suspended ceiling can be realized; the adjusting block is matched with the decorative cover, so that the decorative cover can be lifted in the moving process of the supporting arm, and seamless connection is further ensured; the adjusting block can rotate, so that the decorative cover can adapt to decorative covers with different wall thicknesses, and the universality is improved; the friction resistance between the support arm and the suspended ceiling in the moving process can be reduced by arranging the balls, and the friction resistance is small, so that the power requirement on the driving device is small, and unnecessary energy consumption is reduced; in addition, the mounting device has no part exposed outside the range hood body or the decoration cover, so that the appearance of the whole range hood is attractive.

Drawings

Fig. 1 is a schematic view of an initial state of installation of a decorative cover (hidden air outlet cover) of a range hood according to a first embodiment of the invention;

fig. 2 is a schematic view of a decorative cover mounting device of a range hood according to a first embodiment of the present invention;

fig. 3 is an exploded view of the decoration cover installation device of the range hood according to the first embodiment of the present invention;

fig. 4 is a schematic view of a retracted state of the decorative cover mounting device of the range hood according to the first embodiment of the present invention;

fig. 5 is a schematic view of the extended state of the decorative cover mounting device of the range hood according to the first embodiment of the present invention;

FIG. 6 is a front view of the range hood according to the first embodiment of the present invention;

FIG. 7 is a sectional view of the range hood according to the first embodiment of the present invention showing the state before the decoration cover and the installation base are installed;

FIG. 8 is a front view of the range hood according to the first embodiment of the present invention showing the initial state of the installation of the decoration cover and the installation base;

fig. 9 is a schematic view of the installation completion state of the decoration cover and the installation base of the range hood according to the first embodiment of the present invention (hidden air outlet cover);

fig. 10 is a front view of the range hood according to the first embodiment of the present invention showing the state of the decorative cover and the installation base being installed;

FIG. 11 is a partial schematic view showing the adjustment status of the installation process of the decoration cover and the installation base of the range hood according to the first embodiment of the present invention;

FIG. 12 is an enlarged schematic view of section I of FIG. 11 (before adjustment);

FIG. 13 is an enlarged schematic view of section II of FIG. 11 (adjusted);

fig. 14 is a schematic view (hiding the air outlet cover) of a decorative cover mounting device of a second embodiment of the range hood of the present invention;

fig. 15 is a schematic view of a state of finishing the installation of the decoration cover and the installation base of the range hood according to the third embodiment of the present invention;

fig. 16 is a schematic view of a decorative cover mounting device of a range hood according to a third embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Example one

Referring to fig. 1, a range hood comprises a range hood body 1, a decorative cover 2 and a mounting device 3 for the decorative cover, wherein the decorative cover 2 is arranged on the upper portion of the range hood body 1 and can be longitudinally drawn relative to the range hood body 1. The decorative cover 2 includes a cover body 21 with an open rear side, the cover body 21 includes a front side wall 211, a left side wall 212 and a right side wall 213, so that the cross section of the cover body 21 is substantially U-shaped, the tops of the left and right side walls of the cover body 21 are respectively provided with a flange 22, and the flange 22 is formed by extending a certain distance from the left side wall 212 or the right side wall 213 of the cover body 21 to the inside of the cover body 21.

Referring to fig. 6 and 7, the mounting device 3 is used to mount the trim cover 2 to an external mounting base (wall surface 100) and enables seamless mounting with the ceiling 200.

Referring to fig. 2 and 3, the mounting device 3 includes a housing 31, a driving device 32 disposed in the housing 31, a transmission 33, a first support rod 341, a second support rod 342, a first support arm 351, a second support arm 352, a first adjustment block 361, a second adjustment block 362, a first ball 371, and a second ball 372. A bracket 38 is provided on the back surface (the surface facing the wall surface 100) of the housing 31 to fix the mounting device 3 to the wall surface 100.

The driving device 32 is preferably a motor in the present embodiment, and may be another driving device capable of outputting rotation. After the power is supplied to the driving device 32, the driving device can interact with the control device through wired/wireless transmission, and the control device issues a motor forward/reverse rotation command, so that the lifting of the decorative cover 2 is realized. The control device can be a controller of the range hood or an independent controller.

The transmission 33 includes a first gear 331 disposed on the output shaft of the driving device 32, a second gear 332 engaged with the first gear 332, and a screw rod 333, wherein the screw rod 333 passes through the second gear 332 and is fixedly connected with the second gear 332 so as to be capable of synchronously rotating.

In the present embodiment, the screw 333 extends laterally in the left-right direction, preferably horizontally, and is capable of rotating around its axis by the driving device 32. The two ends of the screw rod 333 are rotatably connected with the shell 31 respectively. The first support rod 341 extends longitudinally, and has one end screwed to the left portion of the screw 333 and the other end connected to one end of the first support arm 351; the second support bar 342 extends longitudinally, and has one end screw-coupled to a right portion of the screw 333 and the other end coupled to one end of the second support arm 352. The top surface of the housing 31 is formed with a first guide groove 311 extending in the left-right direction at a position corresponding to the first support bar 341, and the top surface of the housing 31 is formed with a second guide groove 312 extending in the left-right direction at a position corresponding to the second support bar 342, whereby the first support bar 341 and the second support bar 342 are linearly movable in the left-right direction in the respective guide grooves along the extending direction of the screw 333. That is, the driving unit 32 and the transmission unit 33 constitute a linear driving module for driving the first supporting rod 341 and the second supporting rod 342 to move linearly right and left. The first support arm 351 moves left and right with the first support bar 341 and the second support arm 352 moves left and right with the second support bar 342.

The first support arm 351 and the second support arm 352 extend laterally and away from each other, i.e., the first support arm 351 extends leftward from the connection with the first support rod 341, and the second support arm 352 extends rightward from the connection with the second support rod 342. The first adjusting block 361 is rotatably disposed at an end of the first supporting arm 351 away from the first supporting rod 341, the second adjusting block 362 is rotatably disposed at an end of the second supporting arm 352 away from the second supporting rod 342, a rotating shaft of the first adjusting block 361 extends transversely and is perpendicular to the first supporting arm 351, a rotating shaft of the second adjusting block 362 extends transversely and is perpendicular to the second supporting arm 352, in this embodiment, the rotating shafts extend horizontally in a front-back direction, so that each adjusting block rotates in a vertical plane. The top surface of the first adjusting block 361 is gradually inclined downward from the position close to the first support arm 351 to the direction away from the first support arm 351, and the top surface of the second adjusting block 362 is gradually inclined downward from the position close to the second support arm 352 to the direction away from the second support arm 352. Thus, the combination of the first supporting rod 341, the first supporting arm 351, and the first adjusting block 361, and the combination of the second supporting rod 342, the second supporting arm 352, and the second adjusting block 362 constitute a symmetrical structure.

The first ball 371 is partially disposed within the first support arm 351 and at least partially exposed at the top of the first support arm 351, and the second ball 372 is partially disposed within the second support arm 352 and at least partially exposed at the top of the second support arm 352. The height of each ball exposed to the corresponding support arm is less than the thickness of the flange 22 of the trim cover 2.

In the initial state, the first supporting rod 341 and the second supporting rod 342 are in a contracted state with respect to the screw 333, and are in the closest positions to each other, see fig. 4. When it is desired to mount the trim cover 2, the driving device 32 is activated to drive the screw rod 333 to rotate, so that the first supporting rod 341 and the second supporting rod 342 move (translate) in a direction away from each other, see fig. 5, where the moving direction is indicated by an arrow in fig. 5. When the decorative cover 2 needs to be detached, the driving device 32 is started to reversely rotate, the screw 333 is driven to reversely rotate, and thus the supporting rod 341 and the second supporting rod 342 move (translate) in a direction approaching each other, see fig. 4, which is indicated by an arrow in fig. 4.

Referring to fig. 6 and 7, before the decorative cover 2 is installed, the installation device 3 is first fixed on the wall surface 100, and at this time, the first balls 371 and the second balls 372 contact with the bottom surface of the ceiling 200, that is, the support structure (balls and support arms) is in seamless contact with the ceiling 200, which creates conditions for seamless installation of the decorative cover 2, and the first support arms 351 and the second support arms 352 are adjusted to be in a contracted state, so that the decorative cover 2 is ensured not to interfere with the installation device 3 during lifting. As long as ensure the ball and the contact of furred ceiling 200, can realize decorating the seamless installation of cover 2, avoid the measuring error that manual measurement leads to.

Referring to fig. 1 and 8, the decoration cover 2 is installed by first pulling and lifting the decoration cover 2 upward relative to the extractor hood body 1 until contacting with the ceiling 200.

Referring to fig. 9 and 10, the driving device 32 is started to drive the screw rod 333 to rotate, so as to drive the first supporting arm 351 and the second supporting arm 352 to move in the directions away from each other, as shown in the moving direction indicated by the arrow in fig. 10, until the first supporting arm 351 and the second supporting arm 352 respectively slide into the lower side of the flange 22 of the trim cover 2 to be tightly locked with the flange 22, the driving device 32 is locked at this time, the current is increased, and when the controller in the driving device 32 detects that the current is increased to a preset threshold value (it is determined that the current is in the locked state at this time), the current is cut off to stop running, and the mounting of the trim cover 2 is completed. Alternatively, a pressure sensor may be provided on the adjustment block, and the pressure sensor may receive a signal and compare the signal with a preset threshold value when the adjustment block is in contact with the flange 22 of the trim cover 2, and cut off the current to stop the operation when the received pressure signal is greater than the threshold value. The control method for driving the driving device 32 (motor) to stop when being blocked is the prior art, and is not described herein again.

Referring to fig. 11 and 12, the wall thickness (thickness of the flange 22, i.e., the dimension in the up-down direction of the flange 22) of the trim cover 2 is S, and the interval between the top surface of the end of the first regulating block 361 and the second regulating block 362 away from the respective support arms and the bottom surface of the suspended ceiling 200 is h. In the process that the first support arm 351 and the second support arm 352 move towards the corresponding side wall of the decorative cover 2, when the first support arm 351 and the second support arm 352 respectively abut against the turned-over edge 22 of the decorative cover 2, if S > h, the first adjusting block 361 and the second adjusting block 362 can be rotated to a proper angle according to the direction shown by the arrow in fig. 12, so that the first adjusting block 361 and the second adjusting block 362 can be inserted below the turned-over edge 22 and abut against the turned-over edge 22, see fig. 13. The rotation process can be adjusted manually or electrically by additionally arranging a driving mechanism.

The structure that adopts the ball contacts with furred ceiling 200, and two support arms reduce the frictional resistance with furred ceiling 200 under the effect of ball at the translation in-process, reduce the unnecessary energy consumption, can prevent that furred ceiling 200 from scraping the flower simultaneously. The installation of the decorative cover 2 with different width sizes can be realized through the translation of the two supporting arms, and the universality is better; through rotating the regulating block of support arm tip, can realize the installation of the decoration cover 2 of different thickness, further improve the commonality.

Example two

Referring to fig. 14, in the present embodiment, the difference from the first embodiment is that the first adjusting block 361 and the first support arm 351 of the mounting device 3 are fixedly connected, and the second adjusting block 362 and the second support arm 362 are fixedly connected. Is suitable for the installation of the decoration cover 2 with S less than h.

EXAMPLE III

Referring to fig. 15 and 16, in the present embodiment, the difference from the first embodiment is that the first support arm 351 and the second support arm 352 have two, respectively. One of the first support arms 351 is connected to the first support 341, the two first support arms 351 are parallel to each other and spaced apart from each other, and the two first support arms 351 are connected to each other through a first connecting rod 391. One of the second supporting arms 352 is connected to the second supporting rod 342, the two second supporting arms 352 are parallel to each other and spaced apart from each other, and the two second supporting arms 352 are connected to each other through a second connecting rod 392, and preferably, the second supporting arm 352 located at the rear side is connected to the second supporting rod 342. The angle of the adjusting block corresponding to each first supporting arm 351 and each second supporting arm 352 is adjusted independently.

When decorating cover 2 length dimension (fore-and-aft direction's size) and weight are great, the scheme that adopts two support arms can effectively prevent to decorate cover 2 because focus skew and the decoration cover 2 that leads to openly and the too big problem in furred ceiling 200 clearance. When furred ceiling 200 has the inclination, rotate to suitable angle through each regulating block of independent pivoted, realize decorating the seamless installation of cover 2.

In addition, the mounting device 3 has no part exposed outside the range hood body 1 or the decoration cover 2, so that the appearance of the whole range hood is kept attractive.

Claims (10)

1. The utility model provides a mounting device of range hood decorative cover which characterized in that: the decorative cover comprises a first supporting arm (351), a second supporting arm (352) and a driving device (32) for driving the first supporting arm (351) and the second supporting arm (352) to move close to and away from each other in the transverse direction, wherein the first supporting arm (351) and the second supporting arm (352) both extend in the transverse direction, and the ends, away from each other, of the first supporting arm (351) and the second supporting arm (352) are respectively used for supporting the corresponding positions of the decorative cover (2).

2. The mounting device of the range hood trim according to claim 1, wherein: one end of the first supporting arm (351) far away from the second supporting arm (352) is provided with a first adjusting block (361), one end of the second supporting arm (352) far away from the first supporting arm (351) is provided with a second adjusting block (362), the top surface of the first adjusting block (361) is gradually inclined downwards in the direction far away from the first supporting arm (351) from the position close to the first supporting arm (351), and the top surface of the second adjusting block (362) is gradually inclined downwards in the direction far away from the second supporting arm (352) from the position close to the second supporting arm (352).

3. The mounting device of the range hood trim according to claim 2, wherein: the first adjusting block (361) is rotatably connected with the first supporting arm (351), the second adjusting block (362) is rotatably connected with the second supporting arm (352), and the first adjusting block (361) and the second adjusting block (362) can rotate in a vertical plane.

4. The mounting device of the range hood trim according to claim 3, wherein: the first supporting arm (351) and the second supporting arm (352) are respectively provided with two, the two first supporting arms (351) are parallel to each other, and the two first supporting arms (351) are connected with each other through a first connecting rod (391); the two second supporting arms (352) are parallel to each other, and the two second supporting arms (352) are connected with each other through a second connecting rod (392).

5. The mounting device of the range hood trim cover according to any one of claims 1 to 4, wherein: the support arm further comprises a first ball (371) and a second ball (372), wherein the first ball (371) is partially arranged in the first support arm (351) and at least partially exposed out of the top of the first support arm (351), and the second ball (372) is partially arranged in the second support arm (352) and at least partially exposed out of the top of the second support arm (352).

6. The mounting device of the range hood trim cover according to any one of claims 1 to 4, wherein: the supporting device further comprises a transmission device (33) connected with the driving device (32), a first supporting rod (341) and a second supporting rod (342), the first supporting rod (341) and the second supporting rod (342) are arranged in parallel at intervals and extend longitudinally, the first supporting arm (351) is arranged on the first supporting rod (341), the second supporting arm (352) is arranged on the second supporting rod (342), and the first supporting rod (341) and the second supporting rod (342) are respectively connected with the transmission device (33) and can move close to and away from each other in the transverse direction.

7. The mounting device of the range hood trim according to claim 6, wherein: the transmission device (33) comprises a first gear (331) driven by the driving device (32) to rotate, a second gear (332) meshed with the first gear (331), and a screw rod (333) penetrating through the second gear (332) and fixedly connected with the screw rod (333), wherein the first supporting rod (341) is in threaded connection with the screw rod (333), and the second supporting rod (342) is in threaded connection with the screw rod (333).

8. The mounting device of the range hood trim cover according to claim 7, wherein: the novel screw rod driving device is characterized by further comprising a shell (31), the driving device (32) is arranged in the shell (31), two ends of the screw rod (333) are rotationally connected with the shell (31), and a support (38) used for being connected and fixed with an external installation base is arranged on the shell (31).

9. A range hood applying the mounting device of range hood trim cover according to any one of claims 1-8, comprising a trim cover (2), the trim cover (2) comprising a cover body (21), the cover body (21) comprising a left side wall (212) and a right side wall (213), characterized in that: the top inner sides of the left side wall (212) and the right side wall (213) are respectively provided with a flanging (22) used for being matched with the end part of the corresponding supporting arm.

10. The range hood of claim 9, wherein: when the mounting device is provided with a first ball (371) and a second ball (372), the height of each ball exposed to the corresponding supporting arm is less than the thickness of the flanging (22) of the decorative cover (2).

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