Lifting device, clothes airing machine and clothes airing machine control method

Abstract

The invention relates to the technical field of clothes airing, and discloses a lifting device, a clothes airing machine and a clothes airing machine control method.The lifting device comprises a plurality of scissor assemblies, cross beams, elastic pieces, a detection assembly and a control module, each scissor assembly comprises two scissor blades which are hinged in a crossed mode, and the cross beams are hinged to the two ends, in the first direction, of each scissor assembly; every two adjacent scissor assemblies are jointly hinged to one cross beam, and at least one side, in the second direction, of each scissor assembly is slidably hinged to the corresponding cross beam. One end of each elastic piece is connected to the cross beam, and the other end abuts against the sliding end of the corresponding shear blade; the detection assemblies are used for detecting elastic force values and / or length values of the elastic pieces on the corresponding cross beams, and the control module can control the lifting device to stop lifting when the elastic force change values of the elastic pieces exceed a first preset range and / or the length change values exceed a second preset range, so that the scissor assemblies are prevented from pinching a user, and the lifting device is prevented from being clamped and damaged. And the use safety of the clothes airing machine is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of clothes drying technology, and in particular to a lifting device, a clothes drying machine, and a clothes drying machine control method. Background Technology

[0002] A clothes drying rack mainly consists of a main unit and a drying assembly that can be raised and lowered below the main unit. The main unit is usually fixed to the ceiling of the balcony. The drying assembly is connected to the main unit through a telescopic scissor frame, steel wire rope, and other traction components. When the steel wire rope is wound up or released, the telescopic scissor frame retracts or extends to adjust the height of the drying assembly to meet the user's clothes drying needs.

[0003] Existing clothes drying racks typically use telescopic scissor arms composed of multiple sets of hinged scissor blades. When the steel wire rope is released or wound, adjacent scissor blades rotate relative to each other, allowing the multiple sets of scissor blades to extend or fold and retract, thus raising and lowering the drying assembly. If clothing gets stuck between adjacent scissor blades, or if a person places their hand between the scissor blades and fails to remove it in time, the telescopic scissor arm may accidentally raise or lower, causing injury to the person's hand and resulting in a safety accident. Alternatively, clothing or other obstacles stuck between the scissor blades can easily overload and damage the clothes drying rack.

[0004] Therefore, there is an urgent need for a lifting device, a clothes drying rack, and a clothes drying rack control method to solve the above problems. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to provide a lifting device, a clothes drying rack, and a clothes drying rack control method, which can improve the lifting safety of the clothes drying rack and avoid overload failure of the clothes drying rack.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, a lifting device is provided, comprising:

[0008] Multiple sets of scissor assemblies are arranged sequentially along a first direction, and each set of scissor assemblies includes two scissor blades that are cross-hinged.

[0009] The crossbeam is hinged to both ends of each set of scissor assemblies along the first direction. Two adjacent sets of scissor assemblies are hinged together to one crossbeam. Multiple sets of scissor assemblies are slidably hinged to the corresponding crossbeam on at least one side along the second direction. The sliding ends of the scissor blades of two adjacent sets of scissor assemblies are not connected to each other. The first direction is the lifting direction of the lifting device, and the second direction is perpendicular to the first direction.

[0010] An elastic element extends along a second direction, with one end connected to the crossbeam and the other end abutting against the sliding end corresponding to the scissor blade.

[0011] The detection component is used to detect the elastic force value of the elastic element on the crossbeam and / or the length value of the elastic element along the second direction. The control module can control the lifting device to stop lifting when the elastic force change value of the elastic element exceeds a first preset range and / or the length change value of the elastic element exceeds a second preset range.

[0012] As a preferred embodiment of the lifting device of the present invention, a sliding groove is provided on the crossbeam, the end of the scissor blade is slidably hinged to the sliding groove, the elastic element is located in the sliding groove and is connected to the groove wall of the sliding groove.

[0013] As a preferred embodiment of the lifting device of the present invention, the two adjacent sets of scissor assemblies are scissor assembly one and scissor assembly two, scissor assembly one is located below scissor assembly two, the two scissor blades of scissor assembly one are scissor blade one and scissor blade two, and the two scissor blades of scissor assembly two are scissor blade three and scissor blade four.

[0014] The first scissor blade and the fourth scissor blade are slidably hinged to the same groove, and the elastic element abuts against the sliding end of the fourth scissor blade; the sliding end of the fourth scissor blade is provided with a limiting structure, which is used to restrict the first scissor blade from passing over the fourth scissor blade in the second direction.

[0015] As a preferred embodiment of the lifting device of the present invention, the groove wall of the slide is provided with a friction element, the scissor blade is provided with a sliding shaft, and the sliding shaft passes through the slide and slides in contact with the friction element.

[0016] In a preferred embodiment of the lifting device of the present invention, both the friction element and the sliding shaft are made of self-lubricating material.

[0017] As a preferred embodiment of the lifting device of the present invention, a sliding groove is provided on the crossbeam, and one end of the two scissor blades of the scissor assembly along the second direction is slidably hinged to the sliding groove;

[0018] Alternatively, two sliding grooves are provided at intervals along the second direction on the crossbeam, and the two scissor blades of the scissor assembly are slidably hinged to the two sliding grooves one-to-one along the second direction.

[0019] As a preferred embodiment of the lifting device of the present invention, the detection component includes an elastic force detection element and / or a first displacement detection element that are communicatively connected to the control module. The elastic force detection element is used to detect the elastic force value of the elastic element, and the first displacement detection element is used to detect the length value of the elastic element.

[0020] As a preferred embodiment of the lifting device of the present invention, the lifting device further includes a second displacement detection element that is communicatively connected to the control module. The second displacement detection element is used to detect the distance between two adjacent crossbeams. The control module can control the lifting device to stop lifting when the change value of the distance between any two adjacent crossbeams exceeds a third preset range.

[0021] As a preferred embodiment of the lifting device of the present invention, the lifting device further includes an alarm module that is communicatively connected to the control module. When the elastic force change value of any elastic element exceeds a first preset range and / or the length change value of any elastic element exceeds a second preset range, the control module controls the alarm module to issue an alarm signal.

[0022] Secondly, a clothes drying rack is provided, including a main unit, a drying assembly, and a lifting device as described above, wherein one end of the lifting device is connected to the main unit and the other end is connected to the drying assembly.

[0023] Thirdly, a clothes drying rack control method is provided, applied to the clothes drying rack described above, the clothes drying rack control method comprising the following steps:

[0024] The detection component detects the elastic force value F and / or the length value L of the elastic element in real time.

[0025] If the change in elastic force ΔF of any of the elastic elements exceeds a first preset range and / or the change in length ΔL of the elastic element exceeds a second preset range, the control module controls the lifting device to stop lifting.

[0026] As a preferred embodiment of the clothes drying rack control method of the present invention, when the elastic force change value ΔF of the elastic element exceeds a first preset range, the method further includes the following steps:

[0027] The duration T1 during which the elastic force change value ΔF of the elastic element exceeds the first preset range is obtained;

[0028] The control module determines whether the duration T1 exceeds the first preset duration T1max. If so, the control module controls the lifting device to stop lifting.

[0029] As a preferred embodiment of the clothes drying rack control method of the present invention, when the length change value ΔL of the elastic element exceeds the second preset range, the method further includes the following steps:

[0030] The duration T2 during which the length change value ΔL of the elastic element exceeds the second preset range is obtained;

[0031] The control module determines whether the duration T2 exceeds the second set duration T2max. If so, the control module controls the lifting device to stop lifting.

[0032] As a preferred embodiment of the clothes drying rack control method of the present invention, the clothes drying rack control method further includes the following steps:

[0033] While detecting the elastic force value and / or length value of the elastic element, the spacing between each pair of adjacent crossbeams is detected in real time;

[0034] The control module determines whether the change in spacing between any two adjacent beams exceeds a third preset range. If so, the control module controls the lifting device to stop lifting.

[0035] The beneficial effects of this invention are as follows:

[0036] The lifting device, clothes drying rack, and clothes drying rack control method provided by this invention, since multiple sets of scissor assemblies are slidably hinged to corresponding crossbeams on at least one side along the second direction, when the multiple sets of scissor assemblies extend and retract along the first direction, the sliding end of the scissor blades slides along the second direction, causing the elastic element to undergo elastic deformation in the second direction. When the multiple sets of scissor assemblies extend and retract normally, the extension and retraction amounts of the multiple elastic elements are consistent, and the elastic force changes are consistent. If the scissor blades of a certain set of scissor assemblies get stuck on an obstacle (such as a part of clothing or a part of the human body), then that set of scissor assemblies cannot extend and retract normally. Since the sliding ends of the scissor blades of two adjacent sets of scissor assemblies are not connected to each other, the scissor blade stuck on the obstacle will be obstructed, causing the sliding end to stop sliding, resulting in the corresponding elastic element no longer extending and retracting. Therefore, the elastic force change of the elastic element is very small or even no longer changes, and the length of the elastic element also changes very little or even no longer changes, while the remaining scissor assemblies can extend and retract normally, that is, the remaining elastic elements extend and retract normally. Therefore, by detecting the elastic force value and / or length value of the elastic element, it can be determined whether the scissor assembly is stuck on an obstacle. This allows the control module to stop the lifting device in time, preventing the scissor assembly from pinching the user and preventing the lifting device from being stuck and damaged, thus avoiding clothes dryer malfunctions and effectively improving the safety of using the clothes dryer.

[0037] Specifically, each crossbeam is equipped with a detection component corresponding to each elastic element. The detection component continuously monitors the elastic force value F and / or the length value L of the corresponding elastic element. When the elastic force change value ΔF of any elastic element exceeds a first preset range and / or the length change value ΔL of any elastic element exceeds a second preset range, it indicates that the scissor assembly corresponding to that elastic element is not extending or retracting normally, and there is a situation where an obstacle is being clamped. At this time, the control module controls the lifting device to stop lifting. Determining whether there is an obstacle to the lifting of the scissor assembly by detecting the elastic force value and / or the length value of the elastic element is intuitive, accurate, and the control logic is simple and easy to implement. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0039] Figure 1 This is a first structural schematic diagram of the lifting device provided in a specific embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the lifting device provided in a specific embodiment of the present invention when it is stuck by an obstacle;

[0041] Figure 3 This is a schematic diagram of the second structure of the lifting device provided in a specific embodiment of the present invention;

[0042] Figure 4 This is a first flowchart of the clothes drying rack control method provided in a specific embodiment of the present invention;

[0043] Figure 5 This is a second flowchart of the clothes drying rack control method provided in a specific embodiment of the present invention;

[0044] Figure 6 This is the third flowchart of the clothes drying rack control method provided in a specific embodiment of the present invention;

[0045] Figure 7 This is the fourth flowchart of the clothes drying rack control method provided in a specific embodiment of the present invention;

[0046] Figure 8 This is the fifth flowchart of the clothes drying rack control method provided in a specific embodiment of the present invention.

[0047] In the picture:

[0048] 2-Crossbeam; 3-Elastic element;

[0049] 11-Scissors component one; 12-Scissors component two;

[0050] 111 - Scissors blade one; 112 - Scissors blade two;

[0051] 1111 - Sliding shaft;

[0052] 121 - Scissor blade three; 122 - Scissor blade four;

[0053] 21-Slide groove;

[0054] 100 - Obstacles. Detailed Implementation

[0055] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0058] Example 1

[0059] like Figure 1 and Figure 2 As shown, this embodiment provides a lifting device that improves the safety of using a clothes drying rack. The lifting device includes a scissor assembly, a crossbeam 2, an elastic element 3, a detection assembly, and a control module.

[0060] The device comprises multiple sets of scissor assemblies arranged sequentially along a first direction. Each set includes two cross-hinged scissor blades. Each set of scissor assemblies is hinged to a crossbeam 2 at both ends along the first direction. Adjacent sets of scissor assemblies are hinged together to a single crossbeam 2. Multiple sets of scissor assemblies are slidably hinged to a corresponding crossbeam 2 on at least one side along a second direction, and the sliding ends of the scissor blades in adjacent sets are not connected. The first direction is the lifting direction of the lifting device, and the second direction is perpendicular to the first direction. (Refer to...) Figure 1 The directions are: first direction is up and down, second direction is left and right.

[0061] In this embodiment, see Figure 1 Each crossbeam 2 is equipped with an elastic element 3, which extends along a second direction. One end of the elastic element 3 is connected to the crossbeam 2, and the other end abuts against the sliding end of the corresponding scissor blade. The detection component is used to detect the elastic force value of the elastic element 3 on the corresponding crossbeam 2. The control module can control the lifting device to stop lifting when the elastic force change value of the elastic element 3 exceeds a first preset range.

[0062] Since multiple scissor assemblies are slidably hinged to the corresponding crossbeam 2 on at least one side along the second direction, when the multiple scissor assemblies extend and retract along the first direction, the sliding end of the scissor blade slides along the second direction, causing the elastic element 3 to undergo elastic deformation in the second direction. When the multiple scissor assemblies extend and retract normally, the extension and retraction amounts of the multiple elastic elements 3 are consistent, and the elastic force changes are consistent. If the scissor blade of a certain scissor assembly gets stuck on an obstacle 100 (such as a part of clothing or a part of the human body), then that scissor assembly cannot extend and retract normally. Since the sliding ends of the scissor blades of two adjacent scissor assemblies are not connected to each other, the scissor blade stuck on the obstacle 100 will be obstructed, causing the sliding end to stop sliding, resulting in the corresponding elastic element 3 no longer extending and retracting. Therefore, the elastic force change of this elastic element 3 is very small or even no longer changes, while the other scissor assemblies can extend and retract normally, that is, the other elastic elements 3 extend and retract normally. Therefore, by detecting the elastic force value of the elastic element 3, it can be determined whether the scissor assembly is stuck on the obstacle 100. This allows the control module to stop the lifting device in time, preventing the scissor assembly from pinching the user and preventing the lifting device from being stuck and damaged, thus avoiding clothes dryer malfunctions and effectively improving the safety of using the clothes dryer.

[0063] Specifically, each crossbeam 2 is equipped with a detection component corresponding to each elastic element 3. The detection component detects the elastic force value F of the corresponding elastic element 3 in real time. When the elastic force change value ΔF of any elastic element 3 exceeds the first preset range, it indicates that the set of scissor assemblies corresponding to that elastic element 3 is not extending or retracting normally, and there is a situation where an obstacle 100 is clamped. At this time, the control module controls the lifting device to stop lifting. Determining whether there is a lifting obstacle in the scissor assembly by detecting the elastic force value of the elastic element 3 is intuitive and accurate, and the control logic is simple and easy to implement.

[0064] The elastic force value F mentioned above is the value detected by the detection component, and the elastic force change value ΔF is the change in elastic force of the elastic element 3 per unit time. It can be obtained by calculating the difference between the two elastic force values ​​detected by the detection component at two adjacent moments. The unit time can be a value such as 0.1 seconds, 0.2 seconds, 0.5 seconds, etc., that is, the elastic force value F of the elastic element 3 is detected once every 0.1 seconds, 0.2 seconds, and 0.5 seconds. The specific value of the unit time can be obtained from experiments during the design of the clothes drying machine, and is not limited to the values ​​listed in this embodiment.

[0065] When there is no obstruction 100 clamping the scissor assembly, the two scissor blades extend or retract normally. The elastic force of the elastic element 3 will adapt proportionally to the lifting height of the multiple scissor assemblies. When the lifting device rises, the elastic force value detected by the detection component will gradually increase; when the lifting device descends, the elastic force value detected by the detection component will gradually decrease. That is to say, when the multiple scissor assemblies extend, retract, and lift normally, the maximum elastic force change value ΔFmax and the minimum elastic force change value ΔFmin of the elastic element during the extension and retraction of the multiple scissor assemblies are obtained through experiments. The range between the maximum elastic force change value ΔFmax and the minimum elastic force change value ΔFmin is the first preset range. The specific values ​​of ΔFmax and ΔFmin can be measured through actual experiments. If the elastic force change value ΔF of a certain elastic element 3 is not within the first preset range, for example, ΔF is very small or 0, it indicates that the elastic element 3 has not extended or retracted normally, and the scissor assembly is clamped by the obstruction 100.

[0066] In this embodiment, the control module is the control computer board of the clothes drying rack main unit. The control computer board controls the lifting device to rise and fall according to a preset control program. The lifting device also includes a cord reel installed in the clothes drying rack main unit and a steel wire rope installed on the cord reel. The steel wire rope is connected to the drying assembly of the clothes drying rack. When the cord reel winds up the steel wire rope, multiple sets of scissor assemblies retract, causing the drying assembly to rise. When the cord reel releases the steel wire rope, multiple sets of scissor assemblies extend, causing the drying assembly to fall.

[0067] Optionally, see Figure 1 and Figure 2 A groove 21 is provided on the crossbeam 2. The end of the scissor blade is slidably hinged to the groove 21. The elastic element 3 is located within the groove 21 and connected to the groove wall. The groove 21 provides guidance for the sliding of the scissor blade, ensuring that the sliding end of the scissor blade always moves in the second direction, thus improving the telescopic stability of the multiple scissor assemblies. Furthermore, the groove 21 restricts the telescopic direction of the elastic element 3, ensuring that the elastic element 3 always extends and retracts in the second direction, guaranteeing the accuracy of the elastic force detection. For example, the elastic element 3 is a spring.

[0068] In this embodiment, a groove 21 is provided on the crossbeam 2, and one end of each of the two scissor blades of the scissor assembly is slidably hinged to the groove 21 along the second direction. (Refer to...) Figure 1 In the orientation of the crossbeam 2, the slide 21 is opened at the left end of the crossbeam 2, and the multiple scissor assemblies are all slidably hinged to the corresponding crossbeam 2 at their left ends.

[0069] Optionally, two adjacent sets of scissor assemblies are scissor assembly one 11 and scissor assembly two 12, with scissor assembly one 11 located below scissor assembly two 12. In this embodiment, see... Figure 2The bottom set of scissor components is defined as scissor component one 11, and the middle set of scissor components is defined as scissor component two 12. The two scissor blades of scissor component one 111 and scissor blade two 112 are scissor blade one 111 and scissor blade two 112, respectively. The two scissor blades of scissor component two 122 are scissor blade three 121 and scissor blade four 122. Scissor blade one 111 and scissor blade four 122 extend in roughly the same direction and are slidably hinged to the same groove 21. The elastic element 3 abuts against the sliding end of scissor blade four 122. The sliding end of scissor blade four 122 is provided with a limiting structure, which is used to restrict scissor blade one 111 from passing over scissor blade four 122 in the second direction.

[0070] The limiting structure ensures that the sliding stroke of the lower scissor blade 111 within the groove 21 never exceeds the sliding stroke of the upper scissor blade 122 within the groove 21. That is, the sliding end of scissor blade 111 will slide at most until it coincides with the sliding end of scissor blade 122, and will not extend beyond the sliding end of scissor blade 122 to the left (see reference). Figure 2 (in the middle position) ensures that when the lower scissor assembly 11 is stuck by the obstacle 100, only the scissor assembly 11 cannot extend or retract normally, while the other scissor assemblies can still extend or retract normally. Only the elastic element 3 corresponding to the sliding end of the scissor blade 112 does not deform. At this time, the detection component can detect that the elastic force value of the elastic element 3 does not change, that is, the elastic force change value of the elastic element 3 is 0, thereby determining that the lowermost scissor assembly is stuck with the obstacle 100, so that the control module controls the lifting device to stop lifting and lowering in time.

[0071] Similarly, if obstacle 100 is stuck between scissor blade 4 122 and crossbeam 2, the sliding ends of scissor blade 3 121 and scissor blade 4 122 will no longer slide. At the same time, the sliding end of scissor blade 111 will also stop sliding due to the limiting structure on scissor blade 4 122. Scissor blade 2 112 can rotate around the hinge point with scissor blade 111, and its sliding end can continue to slide to drive the elastic element 3 to deform. At this time, only the elastic element 3 corresponding to the sliding end of scissor blade 4 122 does not deform. It is determined that there is a situation where obstacle 100 is stuck in the middle set of scissor components, and the control module controls the lifting device to stop lifting.

[0072] For example, the limiting structure includes a limiting post, which is fixed to the sliding end of the scissor blade 122, and the sliding end of the scissor blade 111 can stop at the limiting post.

[0073] In this embodiment, see Figure 1The system comprises three sets of scissor assemblies and four crossbeams 2. The uppermost crossbeam 2 connects to the main unit of the clothes drying machine, and the lowermost crossbeam 2 connects to the drying assembly. The lowermost set of scissor assemblies and the middle set of scissor assemblies are hinged together on the second crossbeam 2 from the bottom, and the uppermost set of scissor assemblies and the middle set of scissor assemblies are hinged together on the third crossbeam 2 from the bottom. The left end of each of the two scissor blades in each of the three sets of scissor assemblies is slidably hinged to a groove 21 on the corresponding crossbeam 2. The sliding ends of the scissor blades in adjacent sets of scissor assemblies are not connected to each other and can slide independently within the groove 21.

[0074] In other embodiments, the number of scissor assemblies and crossbeams 2 can be increased or decreased according to the lifting height requirements of the clothes drying rack, and is not limited to the number listed in this embodiment.

[0075] Optionally, the detection component includes an elastic force detection element that is communicatively connected to the control module. The elastic force detection element is used to detect the elastic force value of the elastic element 3. For example, the elastic force detection element is a pressure sensor, which is wirelessly connected to the control module, or the pressure sensor is connected to the control module via a signal line. The pressure value detected by the pressure sensor varies depending on whether the elastic element 3 expands or contracts.

[0076] Optionally, the lifting device also includes an alarm module that is communicatively connected to the control module. When the change in elasticity of any elastic element 3 exceeds a first preset range, the control module controls the alarm module to issue an alarm signal to prompt the user to take appropriate measures to troubleshoot the fault and ensure the clothes dryer can be used normally. For example, the alarm module can be a buzzer or a voice broadcast module, which alerts the user by emitting a warning sound.

[0077] Example 2

[0078] This embodiment provides a lifting device, which differs from Embodiment 1 in that:

[0079] In this embodiment, each crossbeam 2 is provided with an elastic element 3, which extends along the second direction. One end of the elastic element 3 is connected to the crossbeam 2, and the other end abuts against the sliding end of the corresponding scissor blade. The detection component is used to detect the length value of the elastic element 3 on the corresponding crossbeam 2 along the second direction. The control module can control the lifting device to stop lifting when the length change value of the elastic element 3 (the deformation amount of the elastic element 3) exceeds the second preset range, thereby preventing the scissor assembly from pinching the user and preventing the lifting device from being jammed and damaged, avoiding clothes dryer malfunctions, and effectively improving the safety of using the clothes dryer.

[0080] Specifically, each crossbeam 2 is equipped with a detection component corresponding to each elastic element 3. The detection component detects the length value L of the corresponding elastic element 3 in real time. When the length change value ΔL of any elastic element 3 exceeds the second preset range, it indicates that the set of scissor assemblies corresponding to that elastic element 3 is not extending or retracting normally, and there is a situation where an obstacle 100 is clamped. At this time, the control module controls the lifting device to stop lifting. Determining whether there is a lifting obstacle in the scissor assembly by detecting the length value of the elastic element 3 is intuitive and accurate, and the control logic is simple and easy to implement.

[0081] The length value L mentioned above is the detection value of the detection component, and the length change value ΔL is the expansion and contraction of the elastic element 3 per unit time. It can be obtained by calculating the difference between the two length values ​​detected by the detection component at two adjacent moments. The unit time can be a value such as 0.1 seconds, 0.2 seconds, 0.5 seconds, etc., that is, the length value L of the elastic element 3 is detected once every 0.1 seconds, 0.2 seconds, and 0.5 seconds. The specific value of the unit time can be obtained from experiments during the design of the clothes drying machine and is not limited to the values ​​listed in this embodiment.

[0082] When there is no obstruction 100 clamping the scissor assembly, the two scissor blades extend or retract normally. The length of the elastic element 3 will adapt proportionally to the lifting height of the multiple scissor assemblies. When the lifting device rises, the length value detected by the detection component will gradually decrease; when the lifting device descends, the length value detected by the detection component will gradually increase. That is to say, when the multiple scissor assemblies extend, retract, and lift normally, the maximum length change value ΔLmax and the minimum length change value ΔLmin of the elastic element during the extension and retraction process of the multiple scissor assemblies are obtained through experiments. The range between ΔLmax and ΔLmin is the second preset range. The specific values ​​of ΔLmax and ΔLmin can be measured through actual experiments. If the length change value ΔL of a certain elastic element 3 is not within the second preset range, for example, ΔL is very small or 0, it indicates that the elastic element 3 has not extended or retracted normally, and the scissor assembly is clamped by the obstruction 100.

[0083] Optionally, the detection component includes a first displacement detection element communicatively connected to the control module. The first displacement detection element is used to detect the length value of the elastic member 3. Exemplarily, the first displacement detection element is a displacement sensor, which is wirelessly connected to the control module, or the displacement sensor is connected to the control module via a signal line. When the elastic member 3 expands or contracts, the displacement value detected by the displacement sensor will differ.

[0084] For example, the displacement sensor can be a laser displacement sensor or a resistance strain gauge, etc. The appropriate displacement sensor can be selected according to the actual design requirements.

[0085] Optionally, the lifting device also includes an alarm module that is communicatively connected to the control module. When the length change of any elastic element 3 exceeds a second preset range, the control module controls the alarm module to issue an alarm signal to prompt the user to take appropriate measures to troubleshoot the fault and ensure the clothes drying rack can be used normally. For example, the alarm module can be a buzzer or a voice broadcast module, which alerts the user by emitting a warning sound.

[0086] Example 3

[0087] This embodiment provides a lifting device, which differs from Embodiments 1 and 2 in that:

[0088] In this embodiment, the detection component detects both the elastic force value of the elastic element 3 on the corresponding crossbeam 2 and the length value of the elastic element 3 along the second direction. The control module can stop the lifting device from lifting when the elastic force change value of the elastic element 3 exceeds a first preset range and the length change value of the elastic element 3 exceeds a second preset range. This prevents the scissor assembly from pinching the user and prevents the lifting device from being jammed and damaged, avoiding clothes dryer malfunctions and effectively improving the safety of using the clothes dryer. Determining whether the scissor assembly is clamping an obstacle 100 based on both the elastic force and length values ​​of the elastic element 3 provides more accurate detection and better safety.

[0089] In this embodiment, the detection component includes an elastic force detection element and a first displacement detection element, which are communicatively connected to the control module. The elastic force detection element is used to detect the elastic force value of the elastic element 3, and the first displacement detection element is used to detect the length value of the elastic element 3. For example, the elastic force detection element is a pressure sensor, which is disposed on the elastic element 3 to detect the elastic force value of the elastic element 3 in real time. The first displacement detection element is a displacement sensor, which is disposed within the slide groove 21 or at the sliding end of the scissor blade that abuts against the elastic element 3, and obtains the length value of the elastic element 3 by detecting the distance between the two ends of the elastic element 3.

[0090] Example 4

[0091] This embodiment provides a lifting device, which differs from Embodiment 1 in that:

[0092] See Figure 3Two sliding grooves 21 are spaced apart along the second direction on the crossbeam 2. The two scissor blades of the scissor assembly are slidably hinged to the two sliding grooves 21 at their respective ends along the second direction. That is, multiple sets of scissor assemblies are slidably hinged to the crossbeam 2 on both sides in the second direction. Correspondingly, each sliding groove 21 is provided with an elastic element 3, and each elastic element 3 is provided with a detection component to detect the elastic force value and / or length value of the elastic element 3. When the elastic force change value of any elastic element 3 exceeds the first preset range and / or the length change value exceeds the second preset range, it is determined that the corresponding set of scissor assemblies is stuck by the obstacle 100, and the control module controls the lifting device to stop lifting.

[0093] Example 5

[0094] This embodiment provides a lifting device, which is a further improvement on the first embodiment. The main difference is:

[0095] Optionally, the groove wall of the slide 21 is provided with friction elements, see reference. Figure 1 The scissor blades are equipped with a sliding shaft 1111, which passes through the slide groove 21 and slides in contact with the friction element. In this embodiment, the friction element is annular, and its shape matches the shape of the slide groove 21. The friction element is circumferentially engaged within the slide groove 21. If the friction element wears out after prolonged use, only the friction element needs to be replaced, reducing the maintenance cost of the clothes drying rack. The friction element improves the smoothness of the sliding shaft 1111 within the slide groove 21, thus enhancing the lifting stability of the lifting device.

[0096] Furthermore, both the friction element and the sliding shaft 1111 are made of self-lubricating material. This self-lubricating material prevents the sliding shaft 1111 from generating abnormal noise during sliding within the groove 21, thus avoiding noise generation. For example, the self-lubricating material is a self-lubricating plastic, which is wear-resistant, reliable, and low-cost, such as polyamide, fluoroplastics, high-density polyethylene, and phenolic plastics.

[0097] Example 6

[0098] This embodiment provides a lifting device, which is a further improvement on the first embodiment. The main difference is:

[0099] Optionally, the lifting device also includes a second displacement detection element that is communicatively connected to the control module. The second displacement detection element is used to detect the distance between two adjacent crossbeams 2. The control module can control the lifting device to stop lifting when the change value of the distance between any two adjacent crossbeams 2 exceeds a third preset range, so as to prevent the scissor assembly from pinching the user and to prevent the lifting device from being jammed and damaged, thereby avoiding clothes drying machine malfunctions and further improving the safety of using the clothes drying machine.

[0100] Specifically, when there is no obstacle 100 clamping the blades, the two blades of the scissor assembly extend or retract normally. The distance between the two adjacent crossbeams 2 adapts proportionally to the extension and retraction of the scissor assembly. When the lifting device rises, the distance detected by the second displacement detector gradually decreases; when the lifting device descends, the distance detected by the second displacement detector gradually increases. If an obstacle 100 clamps the blades, the scissor assembly cannot extend or retract normally, and the distance between the two corresponding crossbeams 2 changes very little or even remains unchanged. The displacement value detected by the second displacement detector remains almost unchanged, indicating that an obstacle 100 is clamping the blades. The control module then stops the lifting device from rising or falling. Determining whether the scissor assembly is clamping an obstacle 100 based on two parameters—the elastic force value of the elastic element 3 and the distance between the two adjacent crossbeams 2—is more accurate and provides better safety.

[0101] For example, the second displacement detection element is a displacement sensor disposed on the crossbeam 2, such as a laser displacement sensor or an infrared displacement sensor.

[0102] The spacing change value ΔH is the displacement change between two adjacent crossbeams 2 per unit time. The maximum spacing change value ΔHmax and the minimum spacing change value ΔHmin between two adjacent crossbeams 2 during the normal expansion and contraction of multiple sets of shear components are obtained through experiments. The range between ΔHmax and ΔHmin is the third preset range mentioned above. The specific values ​​of ΔHmax and ΔHmin can be measured through actual experiments.

[0103] Example 7

[0104] This embodiment provides a clothes drying rack, including a main unit, a drying assembly, and a lifting device as described in any of the above embodiments. One end of the lifting device is connected to the main unit, and the other end is connected to the drying assembly, which is used for drying clothes. The main unit can be fixed to the ceiling of a balcony. The drying assembly may include a clothes rod and a quilt rod for drying clothes, sheets, duvet covers, etc. The lifting device also includes a reel and a steel wire rope. The steel wire rope is connected to the drying assembly. When the reel winds up the steel wire rope, multiple sets of scissor components retract, causing the drying assembly to rise. When the reel releases the steel wire rope, multiple sets of scissor components extend, causing the drying assembly to descend, thereby adjusting the drying height.

[0105] The clothes drying machine using this lifting device can determine whether the scissor assembly is stuck on an obstacle 100 by detecting the elastic force value and / or the length value of the elastic element 3. This allows the control module to stop the lifting device in time, preventing the scissor assembly from pinching the user and preventing the lifting device from being stuck and damaged, thus avoiding clothes drying machine malfunctions and improving the safety of using the clothes drying machine.

[0106] Example 8

[0107] See Figure 4This embodiment provides a clothes drying rack control method, applied to the clothes drying rack described in Embodiment Seven. The clothes drying rack control method includes the following steps:

[0108] S1. The detection component detects the elastic force value F of the corresponding elastic element 3 in real time;

[0109] S2. Determine whether the change value ΔF of the elastic force of any elastic element 3 exceeds the first preset range. If yes, proceed to step S3; otherwise, proceed to step S4.

[0110] S3. The control module controls the lifting device to stop lifting.

[0111] S4. The control module controls the lifting device to continue lifting according to the preset control program.

[0112] That is, when the elastic force change value ΔF of any elastic element 3 exceeds the first preset range, it indicates that the set of scissor assemblies corresponding to that elastic element 3 is not extending or retracting normally, and there is a situation where an obstacle 100 is clamped. At this time, the control module controls the lifting device to stop lifting and lowering to prevent the scissor assembly from pinching the user and to prevent the lifting device from being jammed and damaged, thus avoiding malfunctions of the clothes drying rack and effectively improving the safety of using the clothes drying rack. If the elastic force change value ΔF of each elastic element 3 is within the first preset range, it indicates that there is no obstacle 100, and the lifting device can lift and lower to the position according to the preset control program. Determining whether there is a lifting obstacle for the scissor assembly by detecting the elastic force value of the elastic element 3 is intuitive and accurate, and the control logic is simple and easy to implement.

[0113] In step S1, the detection component includes an elastic force detection element, which is exemplarily a pressure sensor.

[0114] See Figure 5 In step S2, when the change value ΔF of the elastic force of the elastic element 3 exceeds the first preset range, the following steps are also included:

[0115] S21. Obtain the duration T1 during which the elastic force change value ΔF of the elastic element 3 exceeds the first preset range;

[0116] S22. Determine whether the duration T1 exceeds the first set duration T1max. If yes, proceed to step S3; otherwise, proceed to step S4.

[0117] That is, when the elastic force change value ΔF of a certain elastic element 3 is detected to be outside the first preset range, and the duration T1 reaches the first set duration T1max, it indicates that the corresponding scissor assembly is indeed stuck by the obstacle 100. At this time, the control module controls the lifting device to stop lifting. This setting can further improve the detection accuracy and avoid misjudgment that causes the lifting device to stop lifting.

[0118] In this embodiment, the duration T1 can be obtained by measuring with a timer. When the detection component detects that the elastic force change value ΔF of the elastic element 3 exceeds the first preset range, the timer starts timing and compares the duration T1 measured by the timer with the first preset duration T1max. When T1 reaches T1max, the control module controls the lifting device to stop lifting.

[0119] For example, the first preset duration T1max can range from 1 second to 10 seconds, such as 2 seconds, 3 seconds, 4 seconds, 5 seconds, etc. The maximum elastic force change value ΔFmax and the minimum elastic force change value ΔFmin of the elastic element during the extension and retraction of multiple sets of scissor assemblies are obtained through experiments. The range between the maximum elastic force change value ΔFmax and the minimum elastic force change value ΔFmin is the aforementioned first preset range. The specific values ​​of ΔFmax and ΔFmin can be measured through actual experiments.

[0120] Further, see Figure 5 The following steps are included before step S1:

[0121] S01. Obtain control commands from the clothes drying rack, including up and down commands;

[0122] S02. The control module controls the lifting device to rise and fall according to the control command.

[0123] Specifically, if the command is to ascend, when the change in elastic force ΔF of any elastic element 3 exceeds the first preset range and the duration T1 reaches the first set duration T1max, the control module controls the lifting device to stop ascending, and the alarm module simultaneously issues an alarm signal. If the command is to descend, when the change in elastic force ΔF of any elastic element 3 exceeds the first preset range and the duration T1 reaches the first set duration T1max, the control module controls the lifting device to stop descending, and the alarm module simultaneously issues an alarm signal.

[0124] Example 9

[0125] This embodiment provides a clothes drying rack control method, which differs from Embodiment 8 in that:

[0126] See Figure 6 The control method for the clothes drying rack includes the following steps:

[0127] R1, the detection component detects the corresponding elastic length value L in real time;

[0128] R2. Determine whether the length change value ΔL of any elastic element 3 exceeds the second preset range. If yes, proceed to step R3; otherwise, proceed to step R4.

[0129] R3, the control module controls the lifting device to stop lifting;

[0130] R4. The control module controls the lifting device to continue lifting according to the preset control program.

[0131] That is, when the length change value ΔL of any elastic element 3 exceeds the second preset range, it indicates that the set of scissor assemblies corresponding to that elastic element 3 is not extending or retracting normally, and there is a situation where an obstacle 100 is clamped. At this time, the control module controls the lifting device to stop lifting and lowering to prevent the scissor assembly from pinching the user and to prevent the lifting device from being jammed and damaged, thus avoiding malfunctions of the clothes drying rack and improving the safety of using the clothes drying rack. If the length change value ΔL of each elastic element 3 is within the second preset range, it indicates that there is no obstacle 100, and the lifting device can lift and lower to the position according to the preset control program. Determining whether there is a lifting obstacle for the scissor assembly by detecting the length value of the elastic element 3 is intuitive and accurate, and the control logic is simple and easy to implement.

[0132] In step S1, the detection component includes a first displacement detection element, which is exemplarily a displacement sensor.

[0133] See Figure 7 In step R2, when the length change value ΔL of the elastic element 3 exceeds the second preset range, the following steps are also included:

[0134] R21. Obtain the duration T2 of the length change value ΔL of the elastic element 3 exceeding the second preset range;

[0135] R22. Determine whether the duration T2 exceeds the second set duration T2max. If yes, proceed to step R3; otherwise, proceed to step R4.

[0136] That is, when the length change value ΔL of a certain elastic element 3 is detected to be outside the second preset range, and the duration T2 reaches the second set duration T2max, it indicates that the corresponding scissor assembly is indeed stuck by the obstacle 100. At this time, the control module controls the lifting device to stop lifting. This setting can further improve the detection accuracy and avoid misjudgment that causes the lifting device to stop lifting.

[0137] In this embodiment, the duration T2 can be obtained by measuring with a timer. When the detection component detects that the length change value ΔL of the elastic element 3 exceeds the second preset range, the timer starts timing and compares the duration T2 measured by the timer with the second preset duration T2max. When T2 reaches T2max, the control module controls the lifting device to stop lifting.

[0138] For example, the second preset duration T2max can range from 1 second to 10 seconds, such as 2 seconds, 3 seconds, 4 seconds, 5 seconds, etc. The maximum length change value ΔLmax and the minimum length change value ΔLmin of the elastic element during the normal extension and contraction of multiple sets of scissor assemblies are obtained through experiments. The range between ΔLmax and ΔLmin is the aforementioned second preset range. The specific values ​​of ΔLmax and ΔLmin can be measured through actual experiments.

[0139] Example 10

[0140] This embodiment provides a clothes drying rack control method, which differs from Embodiments 8 and 9 in that:

[0141] See Figure 8 The control method for the clothes drying rack includes the following steps:

[0142] W1, the detection component detects the elastic force value F and length change value L of the corresponding elastic element 3 in real time;

[0143] W2. Determine whether the change value ΔF of the elastic force of any elastic element 3 exceeds the first preset range, and whether the change value ΔL of the length of the corresponding elastic element 3 exceeds the second preset range. If yes, proceed to step W3; otherwise, proceed to step W4.

[0144] W3, The control module controls the lifting device to stop lifting;

[0145] W4. The control module controls the lifting device to continue lifting according to the preset control program.

[0146] That is, when the elastic force change value ΔF of any elastic element 3 exceeds the first preset range, and the length change value ΔL of any elastic element 3 exceeds the second preset range, it indicates that the set of scissor assemblies corresponding to that elastic element 3 has not extended or retracted normally, and there is a situation where the obstacle 100 is clamped. At this time, the control module controls the lifting device to stop lifting and lowering to prevent the scissor assembly from pinching the user and to prevent the lifting device from being jammed and damaged, thus avoiding malfunction of the clothes drying rack and ensuring the safe use of the clothes drying rack. If the elastic force change value ΔF of each elastic element 3 is within the first preset range, and the length change value ΔL of each elastic element 3 is within the second preset range, it indicates that there is no obstacle 100, and the lifting device can lift and lower to the position according to the preset control program.

[0147] The scissor assembly is able to determine whether it is stuck on the obstacle 100 by using two parameters: the elastic force value and the length value of the elastic element 3. This method is more accurate and safer.

[0148] In step W1, the detection component includes an elastic force detection element and a first displacement detection element. The elastic force detection element is exemplarily a pressure sensor, and the first displacement detection element is exemplarily a displacement sensor.

[0149] In step W2, when the change in elastic force ΔF of elastic element 3 exceeds the first preset range and the change in length ΔL of elastic element 3 exceeds the second preset range, the following steps are also included:

[0150] W21. Obtain the duration T1 for which the elastic force change value ΔF of the elastic element 3 exceeds the first preset range, and obtain the duration T2 for which the length change value ΔL of the elastic element 3 exceeds the second preset range.

[0151] W22. Determine whether the duration T1 exceeds the first set duration T1max and whether the duration T2 exceeds the second set duration T2max. If yes, proceed to step W3; otherwise, proceed to step W4.

[0152] That is, when the elastic force change value ΔF of a certain elastic element 3 is detected to be outside the first preset range, and the duration T1 reaches the first preset duration T1max, and at the same time, the length change value ΔL of the elastic element 3 exceeds the second preset range, and the duration T2 reaches the second preset duration T2max, it indicates that the corresponding scissor assembly is indeed stuck by the obstacle 100. At this time, the control module controls the lifting device to stop lifting. This setting can further improve the detection accuracy and avoid misjudgment that causes the lifting device to stop lifting.

[0153] For example, the values ​​of the first set duration T1max and the second set duration T2max can both be in the range of 1 second to 10 seconds, such as 2 seconds, 3 seconds, 4 seconds, 5 seconds, etc. The maximum elastic force change value ΔFmax, the minimum elastic force change value ΔFmin, the maximum length change value ΔLmax, and the minimum length change value ΔLmin of the elastic element during the extension and contraction of multiple sets of scissor components are obtained through experiments. The range between ΔFmax and ΔFmin is the first preset range mentioned above, and the range between ΔLmax and ΔLmin is the second preset range. The specific values ​​of ΔFmax, ΔFmin, ΔLmax, and ΔLmin can be measured through actual experiments.

[0154] Example 11

[0155] This embodiment provides a clothes drying rack control method, which is a further improvement on embodiments eight, nine, and ten. The main difference is:

[0156] The control method for clothes drying racks also includes the following steps:

[0157] While detecting the elastic force and / or length of the elastic element 3, the distance H between each pair of adjacent crossbeams 2 is detected in real time.

[0158] Determine whether the change in spacing ΔH between any two adjacent crossbeams 2 exceeds the third preset range. If so, the control module controls the lifting device to stop lifting.

[0159] The distance between two adjacent crossbeams 2 is detected in real time by a second displacement detection device. For example, the second displacement detection device is a displacement sensor installed on the crossbeam 2, such as a laser displacement sensor or an infrared displacement sensor.

[0160] Specifically, when there is no obstacle 100 jamming the blades, the two blades of the scissor assembly extend or retract normally. The distance between two adjacent crossbeams 2 will adapt proportionally to the extension and retraction of the scissor assembly. When the lifting device rises, the distance H detected by the second displacement detector will decrease uniformly; when the lifting device descends, the distance H detected by the second displacement detector will increase uniformly, exhibiting a linear change. If an obstacle 100 jams the blades, the scissor assembly cannot extend or retract normally, and the distance between the corresponding two crossbeams 2 changes very little or even remains unchanged. The displacement value detected by the second displacement detector remains almost unchanged, indicating that an obstacle 100 is jamming the blades. The control module controls the lifting device to stop lifting. If the distance change value ΔH between any two adjacent crossbeams 2 is within the third preset range, it indicates that there is no obstacle 100, and the lifting device can lift and lower to the desired position according to the preset control program.

[0161] The presence of an obstacle 100 in the scissor assembly can be determined by one or any two or three parameters, such as the elastic force value and length value of the elastic element 3 and the distance between two adjacent crossbeams 2. The detection results are more accurate and ensure the safe use of the clothes drying rack.

[0162] The spacing change value ΔH is the displacement change between two adjacent crossbeams 2 per unit time. The maximum spacing change value ΔHmax and the minimum spacing change value ΔHmin between two adjacent crossbeams 2 during the normal expansion and contraction of multiple sets of shear components are obtained through experiments. The range between ΔHmax and ΔHmin is the third preset range mentioned above. The specific values ​​of ΔHmax and ΔHmin can be measured through actual experiments.

[0163] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A lifting device, characterized in that, include: Multiple sets of scissor assemblies are arranged sequentially along a first direction, and each set of scissor assemblies includes two scissor blades that are cross-hinged. A crossbeam (2) is formed, with each set of scissor assemblies hinged to both ends along the first direction. Two adjacent sets of scissor assemblies are hinged together to a crossbeam (2). Multiple sets of scissor assemblies are slidably hinged to the corresponding crossbeam (2) along at least one side along the second direction. The sliding ends of the scissor blades of two adjacent sets of scissor assemblies are not connected to each other. The first direction is the lifting direction of the lifting device, and the second direction is perpendicular to the first direction. Elastic element (3), which extends along the second direction, with one end connected to the crossbeam (2) and the other end abutting against the sliding end of the corresponding scissor blade; The detection component is used to detect the elastic force value of the elastic element (3) on the corresponding crossbeam (2) and / or the length value of the elastic element (3) along the second direction. The control module can control the lifting device to stop lifting when the elastic force change value of the elastic element (3) exceeds a first preset range and / or the length change value of the elastic element (3) exceeds a second preset range.

2. The lifting device according to claim 1, characterized in that, The crossbeam (2) is provided with a sliding groove (21), the end of the scissor blade is slidably hinged to the sliding groove (21), the elastic element (3) is located in the sliding groove (21) and is connected to the groove wall of the sliding groove (21).

3. The lifting device according to claim 2, characterized in that, The two adjacent sets of scissor assemblies are scissor assembly one (11) and scissor assembly two (12). Scissor assembly one (11) is located below scissor assembly two (12). The two scissor blades of scissor assembly one (111) are scissor blade one (111) and scissor blade two (112). The two scissor blades of scissor assembly two (12) are scissor blade three (121) and scissor blade four (122). The first scissor blade (111) and the fourth scissor blade (122) are slidably hinged to the same groove (21), and the elastic element (3) abuts against the sliding end of the fourth scissor blade (122); the sliding end of the fourth scissor blade (122) is provided with a limiting structure, which is used to restrict the first scissor blade (111) from passing over the fourth scissor blade (122) in the second direction.

4. The lifting device according to claim 2, characterized in that, The groove (21) is provided with a friction element on its groove wall, and the shear blade is provided with a sliding shaft (1111). The sliding shaft (1111) passes through the groove (21) and slides in contact with the friction element.

5. The lifting device according to claim 4, characterized in that, Both the friction element and the sliding shaft (1111) are made of self-lubricating material.

6. The lifting device according to claim 2, characterized in that, A groove (21) is provided on the crossbeam (2), and one end of the two scissor blades of the scissor assembly is slidably hinged to the groove (21) along the second direction; Alternatively, two grooves (21) are provided at intervals along the second direction on the crossbeam (2), and the two scissor blades of the scissor assembly are slidably hinged to the two grooves (21) one by one along the second direction.

7. The lifting device according to any one of claims 1-6, characterized in that, The detection component includes an elastic force detection element and / or a first displacement detection element that are communicatively connected to the control module. The elastic force detection element is used to detect the elastic force value of the elastic element (3), and the first displacement detection element is used to detect the length value of the elastic element (3).

8. The lifting device according to any one of claims 1-6, characterized in that, The lifting device also includes a second displacement detection element that is communicatively connected to the control module. The second displacement detection element is used to detect the distance between two adjacent crossbeams (2). The control module can control the lifting device to stop lifting when the change value of the distance between any two adjacent crossbeams (2) exceeds a third preset range.

9. The lifting device according to any one of claims 1-6, characterized in that, The lifting device also includes an alarm module that is communicatively connected to the control module. When the elastic force change value of any elastic element (3) exceeds the first preset range and / or the length change value of any elastic element (3) exceeds the second preset range, the control module controls the alarm module to issue an alarm signal.

10. A clothes drying rack, characterized in that, It includes a main unit, a drying assembly, and a lifting device as described in any one of claims 1-9, wherein one end of the lifting device is connected to the main unit, and the other end of the lifting device is connected to the drying assembly.

11. A clothes drying rack control method, characterized in that, The clothes drying rack described in claim 10, wherein the clothes drying rack control method comprises the following steps: The detection component detects the elastic force value F and / or the length value L of the elastic element (3) in real time. If the elastic force change value ΔF of any of the elastic elements (3) exceeds the first preset range and / or the length change value ΔL of the elastic element (3) exceeds the second preset range, the control module controls the lifting device to stop lifting.

12. The clothes drying rack control method according to claim 11, characterized in that, When the elastic force change value ΔF of the elastic element (3) exceeds the first preset range, the following steps are also included: The duration T1 during which the elastic force change value ΔF of the elastic element (3) exceeds the first preset range is obtained; The control module determines whether the duration T1 exceeds the first preset duration T1max. If so, the control module controls the lifting device to stop lifting.

13. The clothes drying rack control method according to claim 11, characterized in that, When the length change value ΔL of the elastic element (3) exceeds the second preset range, the following steps are also included: The duration T2 during which the length change value ΔL of the elastic element (3) exceeds the second preset range is obtained; The control module determines whether the duration T2 exceeds the second set duration T2max. If so, the control module controls the lifting device to stop lifting.

14. The clothes drying rack control method according to claim 11, characterized in that, The clothes drying rack control method also includes the following steps: While detecting the elastic force value and / or length value of the elastic element (3), the spacing between each two adjacent crossbeams (2) is detected in real time; Determine whether the change in spacing between any two adjacent beams (2) exceeds a third preset range. If so, the control module controls the lifting device to stop lifting.

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