Hanging rack and range hood

Abstract

The utility model relates to the technical field of range hoods, in particular to a hanger and a range hood, which comprises a lifting plate, and a hook is arranged at the lower end of the lifting plate; the lifting plate is vertically and slidably connected with the fixed plate, and a force application point is formed at the joint; acting force opposite to the pulling force in direction is applied to the lifting plate at the force application point; the driving mechanism is connected with the fixing plate and the lifting plate and used for driving the lifting plate to ascend and descend in the vertical direction. When the lifting plate ascends and descends in the vertical direction, the force application point and the lifting plate move synchronously. A cross section perpendicular to the vertical direction is formed by a force bearing point of the hook subjected to the pulling force of the hung object, an area with the radius r is formed on the cross section by taking the force bearing point as the circle center, the projection of a force application point on the cross section falls in the area, and when the hook is subjected to the pulling force of the hung object, the lifting plate is subjected to an acting force opposite to the pulling force in direction at the force application point, so that the lifting plate is prevented from being bent and deformed; the lifting smoothness of the lifting plate is kept, and the actual height of the range hood can be prevented from being affected by bending deformation of the lifting plate.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and particularly relates to a hanging rack and a range hood. Background Art

[0002] A range hood is one of the commonly used household appliances, which sucks cooking fumes into the exhaust duct through a high-speed rotating impeller inside. When installing a range hood, it is necessary to first measure the installation height of the range hood, use expansion bolts, etc. to fix the hanging rack on the wall, and then install the range hood on the hanging rack. However, due to factors such as installation accuracy or the self-weight of the range hood, there is an error between the actual installation height and the predetermined installation height of the range hood. In addition, since some users need to adjust the height of the range hood during the use process, it is necessary to make the hanging rack have the function of adjusting the height of the range hood.

[0003] For example, the Chinese utility model patent with the publication number CN221444317U discloses a hanging bracket and a range hood. The hanging bracket includes a fixing component, a connecting component and an adjusting component. The fixing component includes a fixing plate and a first top plate. An installation groove is provided on the fixing plate, and the first top plate is connected to the fixing plate; the connecting component includes a connecting plate, a second top plate and a connecting piece. The connecting plate is arranged in the installation groove and can move up and down relative to the fixing plate. The second top plate is connected to the connecting plate, and the connecting piece is arranged on the connecting plate for connecting the range hood; the adjusting component includes a driving piece and a fixing piece. The driving piece is rotatably connected to one of the first top plate and the second top plate, and the fixing piece is fixedly connected to the other, and the driving piece is in threaded connection with the fixing piece, so as to drive the connecting component to move up and down relative to the fixing component by rotating the driving piece, and achieve the purpose of adjusting the height of the range hood after hanging.

[0004] Existing hanging racks usually hang the range hood through hooks. When the hook bears a vertical load, the connecting plate that moves up and down relative to the fixing plate will not deform in the direction towards or away from the wall. However, the range hood often has a large size, that is, the pulling force exerted by the hook on the range hood is not vertically downward, but has an obliquely downward pulling force with an acute angle to the wall. This will cause the lifting plate to also receive an oblique force, resulting in the lifting plate in the prior art being prone to bending deformation, thus making the lifting less smooth, and more seriously, causing the hanging rack to fail, resulting in a large change in the actual height of the range hood. Summary of the Utility Model

[0005] To solve the problem that the lifting plate in the hanging rack will deform when it is subjected to an obliquely downward pulling force of the range hood, the purpose of the present utility model is to provide a hanging rack and a range hood.

[0006] The technical solution provided by the present utility model is as follows:

[0007] In a first aspect, a hanging rack includes a fixing plate, and further includes:

[0008] A lifting plate, with a hook provided at the lower end of the lifting plate; the lifting plate is vertically slidably connected to the fixing plate, and a force application point is formed at the connection; wherein, when the hook is subjected to the pulling force of the hanging object, the lifting plate receives a force in the direction opposite to the pulling force at the force application point;

[0009] A driving mechanism, which is connected to the fixing plate and the lifting plate, and the driving mechanism is used to drive the lifting plate to lift vertically; wherein, when the lifting plate lifts vertically, the force application point moves synchronously with the lifting plate;

[0010] Make a cross-section perpendicular to the vertical direction through the force application point of the hook under the pulling force of the hanging object, and make a region with a radius of r centered on the force application point on the cross-section, where 0 cm ≤ r ≤ 10 cm;

[0011] The projection of the force application point on this cross-section falls within the region.

[0012] As an optional technical solution of the first aspect, the fixing plate is provided with a first vertical through groove corresponding to the lifting plate, and a slider is inserted into the first vertical through groove;

[0013] One end of the slider is fixedly connected to the lifting plate, and a limiting block is provided at the other end;

[0014] The limiting block abuts against the end face of the first vertical through groove away from the lifting plate to form the force application point.

[0015] As an optional technical solution of the first aspect, the fixing plate is provided with a first extension plate, and a vertical rod is fixedly connected to the first extension plate, and the vertical rod corresponds to the lifting plate;

[0016] The lifting plate is provided with a second extension plate, and the second extension plate is provided with a first vertical through hole for the vertical rod to pass through;

[0017] The contact between the vertical rod and the hole wall of the first vertical through hole forms the force application point.

[0018] As an optional technical solution of the first aspect, the fixing plate is provided with a third extension plate; the lifting plate is connected with a fourth extension plate, and the fourth extension plate corresponds to the third extension plate;

[0019] The driving mechanism includes a screw rod, which is vertically installed on the third extension plate and can rotate relative to the third extension plate;

[0020] The fourth extension plate is fixedly connected with a fixed nut, and the screw rod is threadedly connected with the fixed nut;

[0021] The driving mechanism further includes a locking component, which is used to limit the vertical movement of the screw rod.

[0022] Optionally, the fixed plate is provided with a second vertical through groove, a third extension plate is arranged at the upper end of the second vertical through groove, and a blocking portion is arranged at the lower end of the second vertical through groove;

[0023] The fourth extension plate passes through the second vertical through groove and can vertically lift along the second vertical through groove;

[0024] The force application point is located at the threaded connection between the screw rod and the fixed nut.

[0025] Optionally, the third extension plate is provided with a second vertical through hole for the screw rod to pass through;

[0026] The top end of the screw rod is fixedly connected with a bolt head, and the outer diameter of the circumcircle of this bolt head is larger than the aperture of the second vertical through hole; the locking assembly includes a locking nut located on the lower side of the second vertical through hole, this locking nut is threadedly connected with the screw rod, and the outer diameter of the circumcircle of the locking nut is larger than the aperture of the second vertical through hole;

[0027] Or,

[0028] The top end of the screw rod is fixedly connected with a bolt head; the locking assembly includes locking nuts located on the upper and lower sides of the second vertical through hole, these locking nuts are threadedly connected with the screw rod, and the outer diameter of the circumcircle of the locking nut is larger than the aperture of the second vertical through hole.

[0029] Optionally, the driving mechanism further includes a motor, and the output shaft of the motor is in transmission connection with the screw rod;

[0030] The locking assembly includes a motor fixing seat for fixedly connecting the motor and the wall surface.

[0031] Optionally, there are multiple lifting plates, and the multiple lifting plates are connected by a connecting plate; the fourth extension plate is arranged on the connecting plate.

[0032] Optionally, the third extension plate and the fourth extension plate are parallel and are located on the same side of the fixed plate as the hook.

[0033] In a second aspect, an oil fume extractor includes a fume machine body; it further includes the hanging rack in the first aspect or any one of the technical solutions in the first aspect, and the fume machine body is connected to the hook.

[0034] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0035] The lifting plate of the present utility model is vertically slidably connected to the fixed plate, and a force application point is formed at the connection, and at the same time, the projection of the force application point downward is 0-10 cm away from the force receiving point of the hook, that is, the horizontal distance between the two is not too large. In this way, when the hook is subjected to the pulling force of the hanging object, the lifting plate is subjected to a force in the opposite direction of the pulling force at the force application point, and this force can restrict the lifting plate, thereby avoiding the bending deformation of the lifting plate due to the force obliquely downward from the range hood, thereby maintaining the smoothness of the lifting of the lifting plate, and also avoiding affecting the actual height of the range hood due to the bending deformation of the lifting plate.

[0036] The range hood of the present utility model is mounted on a liftable lifting plate, and the installation height of the range hood can be adjusted, so as to eliminate the error between the predetermined installation height and the actual installation height of the range hood. At the same time, during the use of the range hood by the user, the height of the range hood can also be adjusted by means of this hanging bracket, so as to facilitate the use. Brief Description of the Drawings

[0037] Figure 1 Schematic diagram of a hanging bracket in an embodiment of the present application;

[0038] Figure 2 Schematic diagram of the fixed plate provided with a first vertical through groove in an embodiment of the present application;

[0039] Figure 3 Schematic diagram of a slider in an embodiment of the present application;

[0040] Figure 4 Schematic diagram of the force application directions of the hook and the lifting plate in an embodiment of the present application;

[0041] Figure 5 Schematic diagram of the force application point when the lifting plate is connected to the slider in an embodiment of the present application;

[0042] Figure 6 Schematic diagram of the screw connected to the motor in an embodiment of the present application;

[0043] Figure 7 Schematic diagram of the connection between the lifting plate and the vertical rod in an embodiment of the present application;

[0044] Figure 8 Schematic diagram of the force application point when the vertical rod is set up in an embodiment of the present application;

[0045] Figure 9 Schematic diagram of the fixed plate provided with a second vertical through groove in an embodiment of the present application;

[0046] Figure 10 Schematic diagram of the force application point located at the threaded connection between the screw and the fixed nut in an embodiment of the present application.

[0047] Explanation of the reference numerals in the schematic diagram:

[0048] Fixed plate 101, third extension plate 102, screw 103, screw rod 104, locking nut 105, fixing nut 106, motor 107, motor fixing seat 108, bolt head 109;

[0049] Lifting plate 201, hook 202, fourth extension plate 203, connecting plate 204;

[0050] Slider 301, first vertical through groove 302, limit block 303;

[0051] First extension plate 401, second extension plate 402, vertical rod 403;

[0052] Second vertical through groove 501, blocking portion 502. Detailed implementation mode

[0053] To further understand the content of the present utility model, the present utility model will be described in detail in combination with the drawings and embodiments.

[0054] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope that the present invention can implement.

[0055] In one embodiment, the present utility model proposes a hanging rack, and the hanging rack includes a fixed plate 101. The fixed plate 101 is used to connect with the installation surface. Here, the installation surface can be a wall, or after installing a board on the wall and then installing the fixed plate 101 on the board, which is not limited here.

[0056] The fixed plate 101 can be installed on the installation surface through screws 103, or through expansion bolts. It should be noted that other structures in the prior art for installing the fixed plate 101 on the installation surface can also be adopted, which is not limited here.

[0057] The hanger in this embodiment includes a lifting plate 201. A hook 202 is provided at the lower end of the lifting plate 201, and hanging objects such as range hoods can be hung on the hook. The lifting plate 201 is vertically slidably connected to the fixing plate 101, that is, the lifting plate 201 can move vertically relative to the fixing plate 101, that is, lift and lower. When the lifting plate 201 lifts and lowers, the height of the hanging object hung on the hook 202 also changes accordingly.

[0058] Since range hoods often have relatively large sizes, that is, the pulling force exerted on the hook by the range hood is not vertically downward, but has an obliquely downward pulling force that forms an acute angle with the wall. This will cause the lifting plate to also receive an oblique force, resulting in the lifting plate in the prior art being prone to bending deformation, thus causing the lifting to be less smooth. More seriously, it will cause the hanger to fail, resulting in a large change in the actual height of the range hood.

[0059] The utility model forms a force application point at the vertical sliding connection between the lifting plate 201 and the fixing plate 101. In this way, when the hook 202 receives an obliquely downward pulling force from the hanging object, the lifting plate 201 receives a force in the opposite direction of the pulling force at the force application point, as Figure 4 shown, thereby preventing the lifting plate 201 from being bent and deformed due to the obliquely downward force from the range hood, thus maintaining the smoothness of the lifting of the lifting plate 201, and also avoiding affecting the actual height of the range hood due to the bending deformation of the lifting plate 201.

[0060] In order to enable the lifting plate 201 to lift and lower, this hanger further includes a driving mechanism. This driving mechanism is connected to the fixing plate 101 and the lifting plate 201. For example, a part of the driving mechanism is connected to the fixing plate 101, and another part is connected to the lifting plate 201. The driving mechanism drives the lifting plate 201 to lift and lower vertically relative to the fixing plate 101.

[0061] In order to ensure that when the lifting plate 201 drives hanging objects such as range hoods to lift and lower to different heights, the lifting plate 201 can always receive a force in the opposite direction of the pulling force at the force application point. In this embodiment, when the lifting plate 201 lifts and lowers vertically, the force application point moves synchronously with the lifting plate 201.

[0062] The position of the force application point relative to the hook 202 should satisfy the following relationship: Make a cross-section perpendicular to the vertical direction through the force application point of the pulling force of the hook 202 by the hanging object. On this cross-section, make a region with a radius of r centered on the force application point, where 0 cm ≤ r ≤ 10 cm, and the projection of the force application point on this cross-section falls within the above region.

[0063] If the horizontal distance between the force application point and the force receiving point of the pulling force of the hook 202 is too large, that is, the projection of the force application point on the cross-section does not fall within the above-mentioned area, then at this time, the restraining effect of the acting force opposite to the pulling force direction on the deformation of the lifting plate 201 at the force application point is poor, and the lifting plate 201 is still prone to bending deformation. When the horizontal distance between the force application point and the force receiving point of the hook 201 is r, and the value range of r satisfies the condition of 0 cm ≤ r ≤ 10 cm, the acting force received by the lifting plate at the force application point can play a role in restraining the deformation of the lifting plate 201.

[0064] When r is 0 cm, that is, the projection of the force application point exactly falls on the force receiving point of the hook, and at this time, the effect of restraining the deformation of the lifting plate 201 is the best. In addition, the value of r can also be 3 cm, or 3.8 cm, or 6.4 cm, or 8 cm, or 10 cm, etc.

[0065] For the driving mechanism, in one embodiment, the fixing plate 101 is provided with a third extension plate 102, and the lifting plate 201 is connected with a fourth extension plate 203. The fourth extension plate 203 corresponds to the third extension plate 102. Here, the correspondence means that a part of the vertical downward projection of the fourth extension plate 203 coincides with the vertical downward projection of the third extension plate 102.

[0066] The driving mechanism includes a screw 104, and the screw 104 is provided with an external thread. This screw 104 is vertically installed on the third extension plate 102 and can rotate relative to the third extension plate 102.

[0067] The driving mechanism further includes a fixing nut 106 fixedly connected to the fourth extension plate 203, and the screw 104 is threadedly connected to the fixing nut 106. The driving mechanism further includes a locking component, and this locking component is used to limit the vertical movement of the screw 104. In this way, when the screw 104 rotates, it can drive the fourth extension plate 203 together with the lifting plate 201 to move up and down.

[0068] The fixing nut 106 can be arranged on the top surface of the fourth extension plate 203, or on the bottom surface of the fourth extension plate 203. It can also be provided with a groove or hole on the fourth extension plate 203 to embed the fixing nut 106 on the fourth extension plate 203. And the fixing nut 106 can be connected to the fourth extension plate 203 by welding or other means, or can be integrally formed on the fourth extension plate 203. For example, the fixing nut 106 is press riveted on the bottom surface of the fourth extension plate 203.

[0069] For the setting method of the force application point, several embodiments shown below can be referred to:

[0070] In one embodiment, as Figure 1 、 2As shown in FIGS. 3 and 5, the fixed plate 101 is provided with a first vertical through slot 302 corresponding to the lifting plate 201, and a slider 301 is inserted into the first vertical through slot 302, and the slider 301 can slide vertically along the first vertical through slot 302. One end of the slider 301 is fixedly connected to the lifting plate 201, for example, by welding, bonding, screw connection, etc. A limit block 303 is provided at the other end of the slider 301, and the width of the limit block 303 is greater than the width of the first vertical through slot 302, so that the limit block 303 and the end face of the first vertical through slot 302 on the side away from the lifting plate 201 are abutted, and a force application point is formed at the abutment between the two. When the slider 301 slides vertically, the limit block 303 also slides vertically. When the limit block 303 slides to any place, the limit block 303 and the end face of the first vertical through slot 302 on the side away from the lifting plate 201 can form a force application point.

[0071] In another embodiment, Figure 7 , 8 As shown, the fixed plate 101 is provided with a first extension plate 401, and a vertical rod 403 is fixedly connected to the first extension plate 401, for example, it can be welded, bonded, fixed with screws and nuts, etc. The vertical rod 403 corresponds to the lifting plate 201. The lifting plate 201 is provided with a second extension plate 402, and the second extension plate 402 is provided with a first vertical through hole for accommodating the vertical rod 403 to pass through, and the contact point between the vertical rod 403 and the wall of the first vertical through hole forms a force application point. When the lifting plate 201 is driven to lift vertically by the driving mechanism, the first vertical through hole can move vertically along the vertical rod 403 relative to the vertical rod 403, and the vertical rod 403 always has a contact point with the wall of the first vertical through hole, and this contact point is the force application point.

[0072] In another embodiment, if Figure 9 , 10 As shown, the fixed plate 101 is provided with a second vertical through slot 501, the third extension plate 102 is provided at the upper end of the second vertical through slot 501, and a blocking portion 502 is provided at the lower end of the second vertical through slot 501. The fourth extension plate 203 passes through the second vertical through slot 501 and can be vertically lifted and lowered along the second vertical through slot 501. The blocking portion 502 can play a limiting role to prevent the fourth extension plate 203 from moving further downward together with the lifting plate 201, that is, to prevent the lifting plate 201 from falling off the fixed plate 101. In this embodiment, the driving mechanism can adopt the structure shown in the above embodiment, and in this structure, the force application point is located at the threaded connection between the screw rod 104 and the fixing nut 106. When the screw rod 104 is rotated, the screw rod 104 drives the fixing nut 106 to be lifted and lowered vertically together with the lifting plate 201, and the threaded connection between the fixing nut 106 and the screw rod 104 also moves vertically together with the vertical lifting and lowering of the lifting plate 201, and the force application point will always exist.

[0073] For the implementation of driving the screw 104 to rotate, the following several implementation schemes can be referred to:

[0074] In one scheme, the third extension plate 102 is provided with a second vertical through hole for the screw 104 to pass through. A bolt head 109 is fixedly connected to the top end of the screw 104. This bolt head 109 can be an external hexagon bolt head or an internal hexagon bolt head. The outer diameter of the circumcircle of this bolt head 109 is larger than the aperture of the second vertical through hole, so as to prevent the screw 104 from falling off the third extension plate 102. The locking assembly includes a locking nut 105 located below the second vertical through hole. This locking nut 105 is threadedly connected to the screw 104, and the outer diameter of the circumcircle of the locking nut 105 is larger than the aperture of the second vertical through hole. When installing the range hood, first rotate the locking nut 105 to a position away from the third extension plate 102, and then rotate the screw 104 to adjust the height of the lifting plate 201. At this time, the locking nut 105 can rotate synchronously with the screw 104. After adjusting the height of the lifting plate 201, rotate the locking nut 105 again to make it move to a position where it abuts against the bottom of the third extension plate 102. At this time, the screw 104 is under the action of the locking nut 105 and the bolt head 109, and the screw 104 is relatively fixed to the third extension plate 102. The screw 104 and the lifting plate 201 cannot move upward relative to the fixed plate 101, thereby improving the stability of the range hood after installation and avoiding the shaking of the range hood during operation.

[0075] In another implementation scheme, the third extension plate 102 is provided with a second vertical through hole for the screw 104 to pass through. A bolt head 109 is fixedly connected to the top end of the screw 104. This bolt head 109 can be an external hexagon bolt head or an internal hexagon bolt head. The locking assembly includes locking nuts 105 located on both the upper and lower sides of the second vertical through hole. These locking nuts 105 are threadedly connected to the screw 104, and the outer diameter of the circumcircle of the locking nut 105 is larger than the aperture of the second vertical through hole. When installing the range hood, first rotate the two locking nuts 105 to positions away from the third extension plate 102, and then rotate the screw 104 to adjust the height of the lifting plate 201. At this time, the two locking nuts 105 can rotate synchronously with the screw 104. After adjusting the height of the lifting plate 201, rotate the two locking nuts 105 again to make them move to positions where they abut against the top and bottom of the third extension plate 102. At this time, the screw 104 is under the action of the two locking nuts 105, and the screw 104 is relatively fixed to the third extension plate 102. The screw 104 and the lifting plate 201 cannot move upward relative to the fixed plate 101, thereby improving the stability of the range hood after installation and avoiding the shaking of the range hood during operation.

[0076] In another scheme, such as Figure 6As shown, the driving mechanism further includes a motor 107, the output shaft of the motor 107 is in transmission connection with the screw 104, for example, it can be connected by a flange. The motor 107 can drive the output shaft to drive the screw 104 to rotate, thereby adjusting the height of the lifting plate 201. In this solution, the locking assembly includes a motor fixing base 108, the motor fixing base 108 is fixedly connected to the wall surface, for example, it can be fixed using expansion bolts. At the same time, the motor 107 is fixedly connected to the motor fixing base 108, for example, it can be fixed using screws. At this time, the height of the motor 107 is fixed relative to the wall surface, and the screw 104 is also fixed relative to the wall surface.

[0077] It should be noted that the number of the fixing plate 101, the lifting plate 201, and the driving mechanism can be in one-to-one correspondence, that is, only one driving mechanism can be installed on one fixing plate 101, and this driving mechanism only drives one lifting plate 201 to lift. It can also be that one driving mechanism is installed on one fixing plate 101, and this one driving mechanism simultaneously drives multiple lifting plates 201, that is, there are multiple lifting plates 201, for example, two. The multiple lifting plates 201 are connected by a connecting plate 204. At this time, the fourth extension plate 203 is arranged on the connecting plate 204, and the driving mechanism can drive the connecting plate 204 and the multiple lifting plates 201 to lift together.

[0078] In an alternative solution, the other solutions are the same as those in the above embodiment. The difference is that the third extension plate 102 and the fourth extension plate 203 are parallel, and the third extension plate 102, the fourth extension plate 203, and the hook 202 are all located on the same side of the fixing plate 101.

[0079] The present utility model also proposes a range hood, which includes a range hood body and also includes the hanging rack in any one of the above embodiments. The range hood body is connected to the hook 202. When adjusting the height of the lifting plate 201, the height of the range hood mounted on the hook 202 is adjusted together, thereby eliminating the error between the predetermined installation height and the actual installation height of the range hood. At the same time, during the use of the range hood by the user, the height of the range hood can also be adjusted by means of this hanging rack, thereby facilitating the use.

[0080] The above schematically describes the present utility model and its implementation manners. This description is not restrictive, and only one of the implementation manners of the present utility model is shown in the drawings. The actual structure is not limited to this. Therefore, if those of ordinary skill in the art are inspired by it and design a structural manner and an embodiment similar to this technical solution without creative work without departing from the creative purpose of the present utility model, they shall fall within the protection scope of the present utility model.

Claims

1. A hanger, comprising a fixing plate (101); characterized in that, Also includes: A lifting plate (201), wherein a hook (202) is provided at the lower end of the lifting plate (201); the lifting plate (201) is vertically slidably connected to the fixed plate (101), and a force application point is formed at the connection; wherein, when the hook (202) is subjected to a pulling force of a mounted object, the lifting plate (201) is subjected to a force in the opposite direction of the pulling force at the force application point; A driving mechanism, the driving mechanism being connected to the fixed plate (101) and the lifting plate (201), and being used for driving the lifting plate (201) to lift and lower in the vertical direction; wherein when the lifting plate (201) is lifted and lowered in the vertical direction, the force application point moves synchronously with the lifting plate (201); A cross section perpendicular to the vertical direction is made through the point where the hook (202) is subjected to the tension of the hanging object, and a region with a radius of r is made on the cross section with the point of force as the center, wherein 0 cm ≤ r ≤ 10 cm; The projection of the force application point on this cross section falls within the area.

2. The rack according to claim 1, characterized in that: The fixed plate (101) is provided with a first vertical through groove (302) corresponding to the lifting plate (201), and a sliding block (301) is inserted into the first vertical through groove (302); One end of the sliding block (301) is fixedly connected to the lifting plate (201), and the other end thereof is provided with a limit block (303); The limiting block (303) abuts against the end surface of the first vertical through slot (302) on one side facing away from the lifting plate (201), thereby forming the force application point.

3. The rack according to claim 1, characterized in that: The fixed plate (101) is provided with a first extension plate (401), and a vertical rod (403) is fixedly connected to the first extension plate (401), and the vertical rod (403) corresponds to the lifting plate (201); The lifting plate (201) is provided with a second extension plate (402), and the second extension plate (402) is provided with a first vertical through hole for allowing the vertical rod (403) to pass through; The point where the vertical rod (403) contacts the wall of the first vertical through hole forms the force application point.

4. The rack according to claim 1, characterized in that: The fixed plate (101) is provided with a third extension plate (102); the lifting plate (201) is connected with a fourth extension plate (203), and the fourth extension plate (203) corresponds to the third extension plate (102); The driving mechanism comprises a screw rod (104), which is vertically mounted on the third extension plate (102) and is rotatable relative to the third extension plate (102); The fourth extension plate (203) is fixedly connected with a fixing nut (106), and the screw rod (104) is threadedly connected to the fixing nut (106); The driving mechanism further comprises a locking assembly, which is used to limit the vertical movement of the screw rod (104).

5. The rack according to claim 4, characterized in that: The fixing plate (101) is provided with a second vertical through slot (501), the third extension plate (102) is provided at the upper end of the second vertical through slot (501), and a blocking portion (502) is provided at the lower end of the second vertical through slot (501); The fourth extension plate (203) passes through the second vertical through groove (501) and can vertically lift along the second vertical through groove (501); The force application point is located at the threaded connection between the screw rod (104) and the fixed nut (106).

6. The hanger according to claim 4, characterized in that: The third extension plate (102) is provided with a second vertical through hole for the screw rod (104) to pass through; The top end of the screw rod (104) is fixedly connected with a bolt head (109), and the outer diameter of the circumcircle of this bolt head (109) is larger than the aperture of the second vertical through hole; the locking assembly includes a locking nut (105) located below the second vertical through hole, and this locking nut (105) is threadedly connected with the screw rod (104), and the outer diameter of the circumcircle of the locking nut (105) is larger than the aperture of the second vertical through hole; Or, The top end of the screw rod (104) is fixedly connected with a bolt head (109); the locking assembly includes locking nuts (105) located on the upper and lower sides of the second vertical through hole, and these locking nuts (105) are threadedly connected with the screw rod (104), and the outer diameter of the circumcircle of the locking nut (105) is larger than the aperture of the second vertical through hole.

7. The hanger according to claim 4, characterized in that: The driving mechanism further includes a motor (107), and the output shaft of the motor (107) is in transmission connection with the screw rod (104); The locking assembly includes a motor fixing seat (108), and the motor fixing seat (108) is used for fixedly connecting with the motor (107) and the wall surface.

8. The hanger according to claim 4, characterized in that: There are multiple lifting plates (201), and the multiple lifting plates (201) are connected by a connecting plate (204); the fourth extension plate (203) is arranged on the connecting plate (204).

9. The hanger according to any one of claims 4-8, characterized in that: The third extension plate (102) and the fourth extension plate (203) are parallel and are both located on the same side of the fixing plate (101) as the hook (202).

10. An oil fume suction machine, characterized in that: It includes a range hood body; it further includes the hanger according to any one of claims 1-9, and the range hood body is connected with the hook (202).

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