A distance measuring device and distance measuring method for a lifting range hood

Abstract

The present invention discloses a distance measuring device for a lifting range hood, comprising: a housing; a fan, arranged in the housing; a smoke collecting chamber, arranged in the housing; a detection mechanism, used to horizontally detect whether there is an obstruction; a horizontal telescopic rod, provided with the detection mechanism, which can be telescoped in the horizontal direction and used to adjust the position of the detection mechanism in the horizontal direction; a vertical telescopic rod, connecting the smoke collecting chamber and the horizontal telescopic rod, which can be telescoped in the vertical direction and used to extend vertically downward until the detection mechanism detects the obstruction; a driving mechanism, arranged in the housing and connected to the smoke collecting chamber, used to limit the distance by which the smoke collecting chamber is driven to descend according to the vertical distance between the smoke collecting chamber and the obstruction detected by the detection mechanism. The present invention also discloses a distance measuring method. The beneficial effect of the present invention is that the accuracy of distance measurement is improved, and the efficiency of distance measurement is also improved.

Description

Technical Field

[0001] The present invention relates to a distance measuring device and a distance measuring method for a lifting range hood, and is applied in the technical field of kitchen appliances. Background Art

[0002] A lift range hood is one with a smoke collection chamber that can be raised and lowered. By adjusting the position of the smoke collection chamber, the distance between the smoke collection chamber and the pot can be reduced during oil fume extraction, improving the extraction effect. The smoke collection chamber can also be retracted when not in use, reducing the size of the range hood for easier operation. Due to user cooking needs, the types of pots used in existing stoves are becoming increasingly complex. When using a range hood with a liftable smoke collection chamber, the smoke collection chamber can easily collide with the pot during its descent. However, the irregular shape of the pot can lead to inaccurate measurements when measuring the pot's height.

[0003] In a prior art application for a lift range hood, the device comprises a housing; a smoke collection chamber that can extend out of the housing to a set distance and fully retract into the housing; and a distance detection assembly mounted on the housing. The distance detection assembly can move horizontally, vertically, and / or diagonally to detect the height of an object below the housing, and the smoke collection chamber is configured to adjust its extension distance based on the height of the object below. In this prior art, the detection mechanism (detection assembly) employs a top-down detection method, which not only requires a large coverage area and complex distance measurement logic, resulting in low distance measurement efficiency, but also makes it difficult to detect the pot wall, resulting in insufficient distance measurement accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a distance measuring device and a distance measuring method for a lifting range hood, which improve the accuracy of distance measurement and also improve the efficiency of distance measurement.

[0005] The present invention is achieved through the following technical solutions.

[0006] A distance measuring device for a lifting range hood, comprising:

[0007] chassis;

[0008] A fan is arranged in the casing;

[0009] A smoke collecting chamber is arranged in the casing;

[0010] A detection mechanism, used for horizontally detecting whether there is an obstruction;

[0011] A vertical telescopic rod, carrying the detection mechanism and connecting the smoke collecting chamber and the horizontal telescopic rod, can be telescoped in the vertical direction and is used to extend vertically downward until the detection mechanism detects an obstruction;

[0012] The driving mechanism is disposed in the housing and connected to the smoke collecting chamber, and is used to limit a distance by which the smoke collecting chamber is driven to descend according to a vertical distance between the smoke collecting chamber and the obstruction detected by the detecting mechanism.

[0013] As a further improvement of the present invention, the detection mechanism includes at least one sensor arranged on the horizontal telescopic rod, and the sensor can emit a horizontal linear detection light beam to detect whether there is an obstruction.

[0014] As a further improvement of the present invention, the sensor is configured as an infrared sensor.

[0015] As a further improvement of the present invention, it further comprises a horizontal telescopic rod, on which the detection mechanism is provided and which can be extended and retracted in the horizontal direction for adjusting the position of the detection mechanism in the horizontal direction.

[0016] As a further improvement of the present invention, the detection mechanism is located outside the outermost stove head.

[0017] As a further improvement of the present invention, the horizontal telescopic direction of the horizontal telescopic rod and the length direction of the stove are staggered with each other.

[0018] As a further improvement of the present invention, the horizontal straight line detection light beam emitted by one of the sensors passes through the center lines of all the stove heads.

[0019] As a further improvement of the present invention, a rotation structure is provided at the connection between the horizontal telescopic rod and the vertical telescopic rod, so that the horizontal telescopic rod can rotate relative to the vertical telescopic rod for expanding or retracting the horizontal telescopic rod.

[0020] As a further improvement of the present invention, the vertical telescopic rod and the detection mechanism are provided in plurality, each of the vertical telescopic rods is provided with the detection mechanism, and the detection range of each detection mechanism is different.

[0021] As a further improvement of the present invention, the detection range of each detection mechanism corresponds to a different cooktop.

[0022] A distance measurement method, comprising the steps of:

[0023] Step S1: the vertical telescopic rod is extended vertically downward, and the detection mechanism continuously detects whether there is an obstruction in the horizontal direction;

[0024] Step S2: the detection mechanism detects the obstruction in the horizontal direction and obtains the vertical distance d2 between the smoke collecting chamber and the obstruction;

[0025] Step S3: the vertical telescopic rod is retracted vertically upward, and the driving mechanism drives the smoke collecting chamber to descend by a distance d3, d3 = d2 - d4, and d4 is a preset safety distance.

[0026] As a further improvement of the present invention, step S2: if the detection mechanism detects an obstruction in the horizontal direction before the vertical telescopic rod is vertically extended downward to the maximum stroke s1, then the vertical telescopic rod vertically extended downward distance d5 = d2.

[0027] As a further improvement of the present invention, if the detection mechanism does not detect an obstruction in the horizontal direction when the vertical telescopic rod is vertically extended downward to the maximum stroke distance s1, the driving mechanism drives the smoke collection chamber to continue to descend until the detection mechanism detects an obstruction, at which time d2 = s1.

[0028] A distance measurement method, comprising the steps of:

[0029] Step S1: The vertical telescopic rod is vertically extended downward by a distance d4, where d4 is a preset safety distance;

[0030] Step S2: the driving mechanism drives the smoke collecting chamber to continuously descend, and the detecting mechanism continuously detects whether there is an obstruction in the horizontal direction;

[0031] Step S3: the detection mechanism detects an obstruction in the horizontal direction, the driving mechanism stops driving the smoke collecting chamber, and the vertical telescopic rod retracts vertically upward.

[0032] Beneficial effects of the present invention:

[0033] 1. Based on the horizontal detection mechanism of the detection mechanism, the detection mechanism can detect and identify the pot regardless of whether the pot is covered or not, which improves the accuracy of distance measurement;

[0034] 2. Based on the horizontal testing mechanism of the testing agency, it can narrow the scope of testing required and expand the actual scope of testing;

[0035] 3. The detection mechanism is driven by a vertical telescopic rod and moves vertically downward to continuously detect. When a pot or other obstruction is detected, the distance measurement is completed. The distance measurement logic is simple and easy to execute, which improves the efficiency of distance measurement.

[0036] 4. Based on the horizontal detection mechanism and the positioning of the detection mechanism, the detection direction is sideways to the oil smoke wind direction. This not only reduces the interference of oil smoke on the detection, but also avoids direct contact between the detection mechanism and the oil smoke, thus preventing the formation of dirt on the detection mechanism;

[0037] 5. The horizontal telescopic rod is only responsible for periodically adjusting the position of the detection mechanism, while the mechanical movement during the detection process is limited to the vertical downward movement of the vertical telescopic rod, which further improves the efficiency of distance measurement and is suitable for rapid distance measurement in relatively simple stove application environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the objects and advantages of the present invention, wherein:

[0039] Figure 1 This is a front view of the range hood distance measuring device for implementing Case 1;

[0040] Figure 2 This is a side view of the range hood distance measuring device for implementing Case 1;

[0041] Figure 3 This is a front view of the range hood distance measuring device for implementation case 2. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0043] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0044] Implementation Case 1

[0045] Reference Figure 1 、 Figure 2 A range hood distance measuring device includes a housing 1, a fan 2, a smoke collecting chamber 3, a detection mechanism 4, a horizontal telescopic rod 5, a vertical telescopic rod 6, and a driving mechanism 7. The housing 1 is arranged directly above a stove S1, on which is mounted at least one burner S2. If the stove S1 is mounted with multiple burners S2, these burners S2 are spaced apart along the length of the stove S1. The fan 2 and the smoke collecting chamber 3 are arranged inside the housing 1. The smoke collecting chamber 3 is provided with an air inlet and faces the area where the smoke is generated by the stove S1 below. When the fan 2 is started, the smoke generated by the pot S3 being cooked on the stove S2 can be sucked into the smoke collecting chamber 3 through the air inlet.

[0046] The vertical telescopic rod 6 is connected to the smoke collecting chamber 3, the horizontal telescopic rod 5 is connected to the vertical telescopic rod 6, and the detection mechanism 4 is arranged on the horizontal telescopic rod 5. More specifically, the top end of the vertical telescopic rod 6 is connected to the bottom of the smoke collecting chamber 3, and the bottom end of the vertical telescopic rod 6 is connected to one end of the horizontal telescopic rod 5.

[0047] The detection mechanism 4, the vertical telescopic rod 6 and the horizontal telescopic rod 5 are the main components used for measuring the distance of the range hood. Among them, the detection mechanism 4 is used to horizontally detect whether there are obstructions. Obstructions include not only the pots S3 located on the stove S2, but also other cooking aids or kitchen utensils placed on the stove S1. The horizontal telescopic rod 5 can be extended and retracted in the horizontal direction, and its horizontal extension can adjust the horizontal position of the detection mechanism 4. The vertical telescopic rod 6 can be extended and retracted vertically. When measuring the distance, the vertical telescopic rod 6 extends vertically downward, which can drive the horizontal telescopic rod 5 and the detection mechanism 4 to move vertically downward. During this process, the detection mechanism 4 continuously detects whether there are obstructions until the detection mechanism 4 detects the obstruction, at which time the vertical telescopic rod 6 stops extending downward and obtains the vertical distance between the smoke collection chamber 3 and the obstruction. After completing the distance measurement, the vertical telescopic rod 6 retracts vertically upward.

[0048] The driving mechanism 7 is disposed in the housing 1 and connected to the smoke collecting chamber 3 , and is used to limit the distance by which the smoke collecting chamber 3 is driven to descend according to the vertical distance between the smoke collecting chamber 3 and the obstruction detected by the detecting mechanism 4 .

[0049] First of all, the main obstruction that the lifting range hood needs to detect is the pot S3 located on the stove S2. If the pot S3 is covered with a lid, both the horizontal detection and the vertical detection can detect the pot S3. If the pot S3 is not covered with a lid, it is limited by the thin pot wall. The vertical detection method from top to bottom is likely to fail to detect the pot wall, thereby incorrectly judging the true height of the pot wall, resulting in a large detection error, which will eventually cause the smoke collecting chamber 3 to collide with the pot S3 when it descends.

[0050] In this embodiment, the detection mechanism is to detect whether there is an obstruction (cooker S3) in the horizontal direction through the detection mechanism 4. The top edge of the cooker S3 and the top of the lid are easy to identify in the horizontal field of view. Therefore, regardless of whether the cooker S3 is covered with a lid or not, its true height can be accurately detected under the detection mechanism of this embodiment, thereby improving the accuracy of the distance measurement.

[0051] Secondly, in vertical detection, the detection range of detection mechanism 4 generally needs to cover the entire stovetop S1. Therefore, detection mechanism 4 requires a mobile mechanism to support its movement within the detection range. However, the mobile mechanism can only be located on the housing 1 or the smoke collection chamber 3. Therefore, the location of the mobile mechanism and the supported coverage range are subject to certain constraints. Alternatively, the detection coverage range can be increased by increasing the number of detection mechanisms 4, which undoubtedly increases costs. There are also some special cases, such as cooking utensils or kitchen utensils placed at the edge of stovetop S1. In this case, they will exceed the detection range of detection mechanism 4 and cannot be detected and identified by detection mechanism 4. In vertical detection, detection mechanism 4 needs to detect all pots S3 on stovetop S1 one by one, and then compare the detected pots S3 to determine the highest height of the pots S3 on stovetop S1, and ultimately determine the range hood's descent distance. Not only is the detection mechanism relatively cumbersome, but it also takes a relatively long time, reducing the efficiency of distance measurement.

[0052] It should be noted that, under the mechanism of horizontal detection, the detection coverage range of the detection mechanism 4 of this embodiment can be reduced from "surface" to "line". For example, if the detection mechanism 4 is set on the side of the stove S1, its detection range only needs to cover the width range of the stove S1. For example, if the detection mechanism 4 is set behind the stove S1, its detection range only needs to cover the length range of the stove S1. The range required for detection can be greatly reduced. Moreover, by detecting in the horizontal direction, the edge of the stove S1 can also be included in the detection range. Therefore, the detection method of this embodiment can expand the actual detection range while reducing the range required for detection coverage.

[0053] In this embodiment, the detection mechanism 4, driven by the vertical telescopic rod 6, continuously detects horizontally whether there is a pot S3. When the detection mechanism 4 detects the presence of the pot S3, it can be determined that the height detected at this time is the highest height of the pot S3 on the stove S1. No comparison is required. The descent distance of the range hood can be determined by the distance that the vertical telescopic rod 6 extends downward relative to the smoke collecting chamber 3 at this time. The distance measurement logic is relatively simple, easier to execute and less prone to errors, thereby improving the accuracy and efficiency of the distance measurement.

[0054] Furthermore, cooking fumes are directed upwards. For vertical detection, the detection mechanism 4 must be located directly above the stovetop S1, facing the direction of the fumes. If detection is performed under heavy fumes, this could interfere with the detection mechanism 4's ability to properly identify the pot S3, affecting the accuracy of the distance measurement. Furthermore, after prolonged use, the fumes from the range hood will form dirt on the detection mechanism 4, affecting its proper detection function.

[0055] In this embodiment, the detection mechanism 4 is generally set on the side of the cookware S3 in a horizontal detection mode. On the one hand, the detection direction is lateral to the oil smoke wind direction, which can reduce the interference of oil smoke on the detection and identification of the cookware S3. On the other hand, the detection mechanism 4 will not be in direct contact with the oil smoke, making it difficult for the oil smoke to form dirt on the detection mechanism 4. Therefore, based on the horizontal detection mechanism of this embodiment and the setting position of the detection mechanism 4, not only can the accuracy of the ranging be improved, but also its normal working time can be maintained for a long time, reducing the frequency of cleaning and maintenance.

[0056] In this embodiment, the detection mechanism 4 is located on the outer side of the outermost stove head S2. On the one hand, the detection range of the detection mechanism 4 only needs to cover the width of the stove S1. On the other hand, the two sides of the stove S1 have a larger space than other positions (such as the front and back of the stove S1), which is conducive to the spatial layout of the detection mechanism 4, the vertical telescopic rod 6 and the horizontal telescopic rod 5.

[0057] In this embodiment, the horizontal extension direction of the horizontal extension rod 5 and the length direction of the stove S1 are intertwined, which is beneficial to the construction of the detection range of the detection mechanism 4. Generally, the horizontal extension direction and the length direction of the stove S1 are perpendicular to each other.

[0058] As for the detection mechanism 4, in this embodiment, the detection mechanism 4 includes at least one sensor arranged on the horizontal telescopic rod 5, and the sensor can emit a horizontal straight detection light beam to detect whether there is an obstruction.

[0059] In general use of the stove S1, the pot S3 is placed directly on the stove S2, so only one sensor is needed to meet basic distance measurement requirements. The horizontal straight line detection beam emitted by the sensor passes through the center line of all stoves S2 (the perpendicular line passing through the center of the stove S2), so that all pots S3 are within the detection coverage range. Of course, if the position of the pot S3 placed on the stove S2 deviates from the center of the stove S2, or the pot S3 is not placed on the stove S2, or the pot S3 is placed at the edge of the stove S1, it is necessary to expand the detection coverage range of the detection mechanism 4. Multiple sensors can be set and spaced along the length of the horizontal telescopic rod 5. In addition, in this multi-sensor embodiment, the detection beams emitted by multiple sensors can also pass through the center line of a stove S2 respectively. Such an arrangement can further expand the actual detection range.

[0060] In this embodiment, the sensor is set to an infrared sensor, which has the advantages of high sensitivity, quick response, low price and stable performance. Of course, the sensor can also be set to other detection devices with similar effects.

[0061] In this embodiment, a rotating mechanism 8 is provided at the connection between the horizontal telescopic rod 5 and the vertical telescopic rod 6, allowing the horizontal telescopic rod 5 to rotate relative to the vertical telescopic rod 6, thereby extending or retracting the horizontal telescopic rod 5. When the range hood does not need to measure distance, the horizontal telescopic rod 5 can be retracted and folded together with the vertical telescopic rod 6 by the rotating mechanism 8, and then retracted into the smoke collection chamber 3. This not only makes the range hood more concise, but also protects the vertical telescopic rod 6, the horizontal telescopic rod 5, and the detection mechanism 4.

[0062] Implementation Case 2:

[0063] Reference Figure 3 A lifting range hood distance measuring device, compared with implementation case 1, the difference is that this implementation case does not have a horizontal telescopic rod, and there are multiple vertical telescopic rods 6 and detection mechanisms 4, and the number of the two is equal. Each vertical telescopic rod 6 is provided with a detection mechanism 4, and the detection range of each detection mechanism 4 is different.

[0064] In this embodiment, the detection range of each detection mechanism 4 corresponds to a different stove S2. Therefore, the range hood distance measuring device of this embodiment can simultaneously measure the distance of each stove S2 when measuring the distance. This embodiment is particularly suitable for application environments with a large number of stoves S2, such as commercial kitchens.

[0065] Implementation Case 3:

[0066] A distance measurement method is implemented based on the range hood distance measurement device of implementation case 1 or implementation case 2.

[0067] The steps include:

[0068] Step S1: The vertical telescopic rod 6 is extended vertically downward, and the detection mechanism 4 continuously detects whether there is an obstruction in the horizontal direction.

[0069] Step S2: If the detection mechanism 4 detects an obstruction in the horizontal direction before the vertical telescopic rod 6 extends vertically downward to the maximum stroke s1, the vertical telescopic rod 6 extends vertically downward by a distance d5, and the vertical distance d2 = d5 between the smoke collecting chamber 3 and the obstruction is obtained.

[0070] Step S3: The vertical telescopic rod 6 retracts vertically upward, and the driving mechanism 7 drives the smoke collecting chamber 3 to descend a distance d3, d3 = d2 - d4, d4 is a safety distance. This safety distance can usually be a distance that is convenient for a user to perform cooking operations such as stir-frying, while ensuring that the smoke collecting chamber 3 can fully absorb oil smoke. It is preset before leaving the factory and can be obtained through multiple actual simulation tests.

[0071] If the distance measurement method implemented by the lifting range hood distance measuring device is based on implementation case 1, a pre-step is still required, namely step S0: the lifting range hood is turned on, the horizontal telescopic rod 5 is extended and retracted in the horizontal direction, and the position of the detection mechanism 4 is adjusted. The adjustment criterion is that the center line of each stove S1 needs to be included in the detection range of the detection mechanism 4.

[0072] If the distance measurement method is implemented based on the distance measurement device for the lifting range hood of Implementation Case 2, multiple vertical telescopic rods 6 are telescopically moved synchronously.

[0073] Implementation Case 4:

[0074] A distance measurement method is implemented based on the range hood distance measurement device of implementation case 1 or implementation case 2.

[0075] The steps include:

[0076] Step S1: The vertical telescopic rod 6 is extended vertically downward, and the detection mechanism 4 continuously detects whether there is an obstruction in the horizontal direction.

[0077] Step S2: If the detection mechanism 4 does not detect an obstruction in the horizontal direction when the vertical telescopic rod 6 is extended vertically downward to the maximum travel distance s1, the driving mechanism 7 drives the smoke collecting chamber 3 to continue to descend until the detection mechanism 4 detects the obstruction. At this time, the vertical distance d2 = s1 between the smoke collecting chamber 3 and the obstruction is obtained.

[0078] Step S3: the vertical telescopic rod 6 is retracted vertically upward, and the driving mechanism 7 drives the smoke collecting chamber 3 to descend by a distance d3, where d3 = d2 - d4.

[0079] If the distance measurement method implemented by the lifting range hood distance measuring device is based on implementation case 1, a pre-step is still required, namely step S0: the lifting range hood is turned on, the horizontal telescopic rod 5 is extended and retracted in the horizontal direction, and the position of the detection mechanism 4 is adjusted. The adjustment criterion is that the center line of each stove S1 needs to be included in the detection range of the detection mechanism 4.

[0080] If the distance measurement method is implemented based on the distance measurement device for the lifting range hood of Implementation Case 2, multiple vertical telescopic rods 6 are telescopically moved synchronously.

[0081] Implementation Case 5:

[0082] A distance measurement method is implemented based on the range hood distance measurement device of implementation case 1 or implementation case 2.

[0083] The steps include:

[0084] Step S1: The vertical telescopic rod 6 is extended vertically downward by a distance d4;

[0085] Step S2: the driving mechanism 7 drives the smoke collecting chamber 3 to continuously descend, and the detecting mechanism 4 continuously detects whether there is an obstruction in the horizontal direction;

[0086] Step S3: the detection mechanism 4 detects an obstruction in the horizontal direction, the driving mechanism 7 stops driving the smoke collecting chamber 3, and the vertical telescopic rod 6 retracts vertically upward.

[0087] If the distance measurement method implemented by the lifting range hood distance measuring device is based on implementation case 1, a pre-step is still required, namely step S0: the lifting range hood is turned on, the horizontal telescopic rod 5 is extended and retracted in the horizontal direction, and the position of the detection mechanism 4 is adjusted. The adjustment criterion is that the center line of each stove S1 needs to be included in the detection range of the detection mechanism 4.

[0088] If the distance measurement method is implemented based on the distance measurement device for the lifting range hood of Implementation Case 2, multiple vertical telescopic rods 6 are telescopically moved synchronously.

[0089] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A range hood distance measuring device, characterized in that: include: chassis; A fan is arranged in the casing; A smoke collecting chamber is arranged in the casing; A detection mechanism, used for horizontally detecting whether there is an obstruction; a vertical telescopic rod, carrying the detection mechanism and connecting the smoke collection chamber and the horizontal telescopic rod, capable of vertical extension and contraction, for extending vertically downward until the detection mechanism detects an obstruction while the smoke collection chamber is stationary, or for extending vertically downward to a safe distance before the smoke collection chamber continues to descend; A driving mechanism is disposed in the housing and connected to the smoke collecting chamber, and is used to limit the distance by which the smoke collecting chamber is driven to descend according to the vertical distance between the smoke collecting chamber and the obstruction detected by the detection mechanism, or to drive the smoke collecting chamber to continue descending after the vertical telescopic rod is vertically extended downward a safe distance until the detection mechanism detects the obstruction.

2. The distance measuring device for a range hood lift according to claim 1, characterized in that: The detection mechanism includes at least one sensor arranged on the horizontal telescopic rod, and the sensor can emit a horizontal linear detection light beam to detect whether there is an obstruction.

3. The distance measuring device for a range hood lift according to claim 2, characterized in that: The sensor is configured as an infrared sensor.

4. The distance measuring device for a range hood lift according to claim 2, characterized in that: It also includes a horizontal telescopic rod, which is provided with the detection mechanism and can be extended and retracted in the horizontal direction to adjust the position of the detection mechanism in the horizontal direction.

5. The distance measuring device for a range hood lift according to claim 4, characterized in that: The detection mechanism is located outside the outermost stove head.

6. The distance measuring device for a lifting range hood according to claim 5, characterized in that: The horizontal telescopic direction of the horizontal telescopic rod and the length direction of the stove are intertwined.

7. The distance measuring device for a range hood lift according to claim 4, characterized in that: A horizontal straight line detection light beam emitted by one of the sensors passes through the center lines of all the stove heads.

8. The distance measuring device for a range hood lift according to claim 4, characterized in that: A rotating structure is provided at the connection point between the horizontal telescopic rod and the vertical telescopic rod, so that the horizontal telescopic rod can rotate relative to the vertical telescopic rod for expanding or retracting the horizontal telescopic rod.

9. The distance measuring device for a range hood lift according to claim 2, characterized in that: There are multiple vertical telescopic rods and detection mechanisms, each of which is provided with the detection mechanism, and the detection range of each detection mechanism is different.

10. The distance measuring device for a range hood lift according to claim 9, characterized in that: The detection range of each detection mechanism corresponds to a different stove head.

11. A distance measurement method, based on the range hood distance measurement device according to any one of claims 1 to 10, characterized in that the steps include: Step S1: the vertical telescopic rod is extended vertically downward, and the detection mechanism continuously detects whether there is an obstruction in the horizontal direction; Step S2: the detection mechanism detects the obstruction in the horizontal direction and obtains the vertical distance d2 between the smoke collecting chamber and the obstruction; Step S3: the vertical telescopic rod is retracted vertically upward, and the driving mechanism drives the smoke collecting chamber to descend a distance d3, d3 = d2 - d4, and d4 is a preset safety distance.

12. The distance measurement method according to claim 11, characterized in that: Step S2: If the detection mechanism detects an obstruction in the horizontal direction before the vertical telescopic rod is vertically extended downward to the maximum stroke s1, then the vertical telescopic rod vertically extended downward distance d5 = d2.

13. The distance measurement method according to claim 11, characterized in that: Step S2: If the detection mechanism does not detect an obstruction in the horizontal direction when the vertical telescopic rod is vertically extended downward to the maximum travel distance s1, the driving mechanism drives the smoke collecting chamber to continue to descend until the detection mechanism detects an obstruction, at which time d2 = s1.

14. A distance measurement method, based on the range hood distance measurement device according to any one of claims 1 to 10, characterized in that the steps include: Step S1: The vertical telescopic rod is vertically extended downward by a distance d4, where d4 is a preset safety distance; Step S2: the driving mechanism drives the smoke collecting chamber to continuously descend, and the detecting mechanism continuously detects whether there is an obstruction in the horizontal direction; Step S3: the detection mechanism detects an obstruction in the horizontal direction, the driving mechanism stops driving the smoke collecting chamber, and the vertical telescopic rod retracts vertically upward.

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