Buffer brake mechanism, driving structure and cleaning device

Abstract

The application relates to a buffer brake mechanism, a driving structure and cleaning equipment, and the buffer brake mechanism is applied to a rack driving wheel mechanism, the rack driving wheel mechanism comprises a rack, a driving wheel which reciprocates along the rack and a driving piece, and the buffer brake mechanism comprises a sliding block and an elastic element; the sliding block is arranged at the end of the rack in the extension direction of the rack and is matched with the driving wheel; the elastic element acts on the sliding block; when the driving wheel runs to the end position of the rack, the sliding block is translated in the extension direction of the rack in response to the action of the driving wheel, so that the energy generated by the driving piece due to inertia after stopping working is released through the sliding block, and the sliding block is reset in response to the action of the elastic element after the driving wheel retreats to the rack. Through the above mode, the release of the inertia energy is completed while the motion limiting is realized, and the buffer brake mechanism has the advantages of simple structure and convenient use.

Description

Technical Field

[0001] This invention relates to the field of cleaning equipment technology, and in particular to a buffer braking mechanism, a drive structure, and a cleaning device. Background Technology

[0002] As people's living standards improve, their requirements for household hygiene also increase, leading to the widespread adoption of vacuum cleaners. Vacuum cleaners can be categorized by structure into upright, canister, and portable types. Existing upright vacuum cleaners, designed for easy cleaning of non-open spaces such as under beds and tables, utilize a drive mechanism on the main shaft that allows for vertical movement. This drive mechanism typically includes a rack fixed to the main shaft, a drive wheel meshing with the rack, and a DC motor that drives the drive wheel. During use, when the drive wheel moves near the end of the rack, the DC motor's inertia causes it to continue driving the drive wheel along the rack, preventing it from braking.

[0003] To address this technical problem, existing technologies typically employ two types of buffer braking mechanisms. One type involves setting a stop structure at each end of the rack. When the drive wheel continues to rotate under inertia, it impacts the stop structure and brakes, which can easily damage the stop structure and the drive wheel. The other type uses a sensor to detect the position of the drive wheel and cut off the power. However, the distance the drive wheel moves on the rack under inertia each time is uncertain, making it difficult to control the trigger position for power-off and resulting in poor braking performance. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the buffer brake mechanism on the existing drive mechanism in which the drive wheel meshes with the rack is easily damaged or has poor braking effect.

[0005] Therefore, the present invention provides a buffer braking mechanism for braking a drive mechanism. The drive mechanism includes a rack, a drive wheel meshing with the rack, and a drive assembly for driving the drive wheel to rotate and reciprocate linearly on the rack. The drive assembly includes at least a DC motor. The buffer braking mechanism includes a slider slidably disposed outside one end of the rack along its length direction. The slider has at least one first tooth. The tooth thickness of the first tooth is equal to the tooth thickness of a second tooth of the rack. The slider has an initial position away from the end of the rack and an end close to the rack. The critical position; in the initial position, the distance between the first tooth and the second tooth at the upper end of the rack is an integer multiple of the tooth thickness; at least one biasing element applies a biasing force to the slider, forcing the slider to tend to remain in the initial position; in the initial position, the first tooth of the slider can engage with the third tooth of the drive wheel in either the forward or reverse direction; between the initial position and the critical position, the first tooth of the slider disengages from the third tooth, causing the drive wheel to slip on the slider, and the slider reciprocates between the critical position and the initial position under the action of the drive wheel and the biasing element.

[0006] Preferably, the aforementioned buffer braking mechanism further includes a limiting member fixedly disposed outside the end of the rack; the sliding member is slidably disposed between the limiting member and the end of the rack; wherein, the two ends of the biasing member are respectively connected to the limiting member and the sliding member.

[0007] Preferably, the aforementioned buffer brake mechanism further includes: a main body component for the rack to be fixedly mounted; the limiting member is fixed on the main body component; and the sliding member is slidably mounted on the main body component.

[0008] Preferably, in the aforementioned buffer braking mechanism, the main body component is provided with a groove extending along the sliding direction of the sliding member; both the sliding member and the biasing member are disposed within the groove.

[0009] Preferably, in the aforementioned buffer braking mechanism, the biasing element is a compression spring; and / or the sliding element is a plate.

[0010] The present invention also provides a drive structure, including a drive mechanism and at least one buffer brake mechanism as described above; the drive mechanism includes a rack, a drive wheel meshing with the rack, and a drive assembly for driving the drive wheel to rotate to make reciprocating linear movement on the rack, the drive assembly including at least a DC motor.

[0011] Preferably, in the aforementioned drive structure, there are two buffer brake mechanisms, each located at the ends of the rack.

[0012] Preferably, in the above-described drive structure, the extension direction of the rotation axis of the drive wheel is parallel to the extension direction of the rack; or, the extension direction of the rotation axis of the drive wheel is perpendicular to the extension direction of the rack.

[0013] Preferably, the aforementioned drive structure further includes: a detector connected to the DC motor for detecting the current of the DC motor; a power supply unit for supplying power to the DC motor; and a controller connected to the detector and the power supply unit.

[0014] The present invention also provides a cleaning device, comprising: a body having a main component having a suction channel; a drive structure as described above, wherein the rack in the drive structure is fixed to the outer wall of the main component; a sliding frame connected to the drive wheel and reciprocating linearly on the rack under the drive wheel's influence; and a main unit assembly disposed on the sliding frame, the main unit assembly including a first motor; the first motor being used to generate suction force so that dust enters the main unit assembly through the suction channel.

[0015] The present invention has the following beneficial effects:

[0016] Driven by a DC motor, the drive wheel rotates in the forward direction and meshes with the rack in the forward direction, moving from right to left. During this process, the slider remains in the initial position. Since the distance between the first tooth and the second tooth at the end of the rack is an integer multiple of the tooth thickness, when the drive wheel runs to one end of the rack, as the drive wheel continues to rotate, the drive wheel gradually disengages from the rack and meshes with the first tooth on the slider in the forward direction.

[0017] After the drive wheel engages with the slider, as the drive wheel continues to rotate, the third tooth of the drive wheel gradually disengages from the first tooth of the slider. During this process, the slider remains in its initial position. When the third tooth of the drive wheel disengages from the first tooth of the slider, the drive wheel continues to rotate forward. Because the tooth on the drive wheel is no longer engaged with the first tooth, the drive wheel slips on the slider. At this time, the current of the DC motor decreases. After the detector detects the current decrease, it sends a signal to the controller. Based on the current decrease signal, the controller controls the power supply unit to stop providing forward current to the DC motor.

[0018] However, due to inertia, the DC motor does not stop rotating immediately, and the drive wheel continues to rotate under the action of the DC motor. At this time, the drive wheel is still spinning freely on the sliding part until the inertial energy of the DC motor is exhausted, at which point the drive wheel stops rotating. Thus, the buffer brake mechanism releases the inertial energy of the DC motor while achieving motion limit, effectively avoiding damage to the DC motor and the drive wheel.

[0019] Therefore, the buffer brake mechanism releases the inertial energy of the DC motor while achieving motion limit, which can effectively avoid damage to the buffer brake mechanism, DC motor and drive wheel by the aforementioned inertial energy during braking. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cleaning equipment proposed in this invention;

[0021] Figure 2 This is a schematic diagram of the first opening on the main component of the present invention;

[0022] Figure 3 This is a schematic diagram of the second opening on the main component in this invention;

[0023] Figure 4 This is a schematic diagram showing the positional relationship between the main component and the driving structure in this invention;

[0024] Figure 5 yes Figure 4 Enlarged structural diagram of region A in the middle;

[0025] Figure 6 This is a schematic diagram of the drive structure when the rotation axis of the drive wheel is parallel to the rack in this invention;

[0026] Figure 7 This is a schematic diagram of the drive structure when the rotation axis of the drive wheel is perpendicular to the rack in this invention;

[0027] Figure 8 This is a cross-sectional structural diagram of the buffer braking mechanism in this invention;

[0028] Figure 9 This is a schematic diagram of the sliding component in this invention;

[0029] Figure 10 This is a schematic diagram of the present invention when the slide, the limiting member, and the rack are integrally arranged;

[0030] Figure 11 This is a schematic diagram showing the drive wheel disengaging from the rack and engaging with the sliding component when the drive wheel is in forward engagement.

[0031] Figure 12 yes Figure 11 A magnified structural diagram of region C in the middle;

[0032] Figure 13 This is a schematic diagram of the drive wheel spinning and slipping on the sliding component when the drive wheel is engaged in the forward direction;

[0033] Figure 14 yes Figure 13 A magnified structural diagram of region D in the middle;

[0034] Figure 15 This is a schematic diagram showing the movement of the drive wheel from the sliding member to the rack under the action of the sliding member when the drive wheels are engaged in the opposite direction;

[0035] Figure 16 yes Figure 15 A magnified structural diagram of region E in the middle;

[0036] Figure 17 This is a schematic diagram of the buffer brake mechanism in this invention without a limiting component;

[0037] Figure 18 yes Figure 17 A magnified structural diagram of region B in the middle.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100-Body; 110-Main body component; 111-First opening; 112-Second opening; 120-Floor brush unit; 130-Handle; 200-Sliding frame; 300-Main unit assembly; 400-Drive structure; 410-Rack; 411-Second tooth; 412-Slide groove; 413-Base; 420-Drive wheel; 421-Third tooth; 430-DC motor; 440-Transmission mechanism; 441-Transmission belt; 442-Driven wheel; 443-Drive wheel; 450-Buffer brake mechanism; 451-Limiting component; 452-Sliding component; 4521-First tooth; 4522-Snap-fit ​​part; 4523-Side groove; 453-Biasing component. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the terms "upper," "lower," "left," and "right," etc., used below to indicate orientation or positional relationships are based solely on the orientation or positional relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a movable connection, or an integral part; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] It should also be noted that, for ease of description, the accompanying drawings only show the parts relevant to the present invention, not the entire structure. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] Please see Figures 4 to 6 As shown, the present invention provides a drive structure 400, including a drive mechanism and a buffer brake mechanism 450. The drive mechanism is a mechanism with linear reciprocating motion function, used to drive a target object to perform linear reciprocating motion. The buffer brake mechanism is distributed at both ends of the target object's motion path, used to brake the drive mechanism, thereby achieving braking and limiting.

[0045] In this invention, the drive mechanism includes a rack 410, a drive wheel 420 meshing with the rack 410, and a drive assembly for driving the drive wheel 420 to rotate and reciprocate linearly on the rack 410. The rack 410 is fixedly installed, meaning its position does not change. Two buffer brake mechanisms are provided, respectively located at the ends of the rack 410 along its length; alternatively, only one buffer mechanism may be provided at one end of the rack.

[0046] In this invention, the drive assembly includes at least a DC motor 430. The DC motor 430 provides rotational driving force to the drive wheel 420, causing the drive wheel 420 to rotate. The DC motor 430 is also connected to a detector (not shown) and a power supply unit (not shown). The power supply unit can be a wireless power source, such as a battery pack, or a wired power source, such as a power supply connected via a wire. The power supply unit supplies power to the DC motor, and can also supply power to other electrical components. Both the detector and the power supply unit are connected to a controller (not shown), which can be a wired electrical connection or a wireless communication connection.

[0047] The detector is used to detect the current of the DC motor 430, and the controller receives the signal from the detector to control the power supply unit to supply power to or disconnect the power supply to the DC motor 430.

[0048] In this invention, please refer to Figure 6 As shown, the rack 410 has a second tooth 411, and the drive wheel 420 has a third tooth 421. The second tooth 411 and the third tooth 421 mesh with each other. During rotation, the drive wheel 420 achieves linear reciprocating motion on the rack 410 by utilizing the meshing relationship between the third tooth 421 and the second tooth 411.

[0049] Further, please refer to Figure 6 and Figure 7As shown, the drive wheel 420 has a rotation axis L. The rotation axis L of the drive wheel 420 and the extending direction (length direction) of the rack 410 have the following two positional relationships. For the first positional relationship, please refer to... Figure 6 As shown, the extension direction of the rotation axis L of the drive wheel 420 is parallel to the extension direction of the rack 410, wherein the third tooth 421 of the drive wheel 420 is helical; for the second positional relationship, please refer to Figure 7 As shown, the extension direction of the rotation axis L of the drive wheel 420 is perpendicular to the extension direction of the rack 410. The drive wheel 420 is a spur gear or a helical gear. The parallel and perpendicular relationships mentioned above refer to parallel and perpendicular relationships in three-dimensional space.

[0050] When the extension direction of the rotation axis L of the drive wheel 420 is parallel to the extension direction of the rack 410, the first facet (outer wall of the drive wheel 420) where the tooth tip of the third tooth 421 on the drive wheel 420 is located is an arc surface, and the second facet where the tooth tip of the second tooth 411 on the rack 410 is located is also an arc surface. Furthermore, the first facet and the second facet are coaxially distributed.

[0051] When the extension direction of the rotation axis L of the drive wheel 420 is perpendicular to the extension direction of the rack 410, the engagement between the drive wheel 420 and the rack 410 is either a spur gear or a helical gear and rack engagement.

[0052] The two types of drive wheels 420 described above have the same motion mode and working principle. The following description will mainly focus on the scenario where the extension direction of the rotation axis of the drive wheel 420 is parallel to the extension direction of the rack 410.

[0053] When the rotation axis of the drive wheel 420 is parallel to the extension direction of the rack 410, the output shaft of the DC motor 430 can be directly fixedly connected to the shaft of the drive wheel 420, or the DC motor 430 can be connected to the drive wheel 420 through the transmission mechanism 440.

[0054] For example, in Figure 6 In one embodiment shown, the extension direction of the DC motor 430 is parallel to the extension direction of the rotation axis of the drive wheel 420. The transmission mechanism 440 includes a driven wheel 442 mounted on the shaft of the drive wheel 420, a driving wheel 443 mounted on the output shaft of the DC motor 430, and a transmission belt 441 tensioned between the driven wheel 442 and the driving wheel 443. The transmission process of the DC motor 430 is as follows: when the output shaft of the DC motor 430 rotates, it drives the driving wheel 443 to rotate. The driving wheel 443 transmits power to the driven wheel 442 via the transmission belt 441, and the driven wheel 442 drives the drive wheel 420 to rotate. The driving wheel 443 and the driven wheel 442 can be gears or synchronous pulleys.

[0055] As an alternative embodiment of the transmission mechanism 440, the transmission mechanism 440 may also be other structures. For example, the transmission mechanism 440 includes a first transmission gear fixed on the output shaft of the DC motor, and a second transmission gear fixed on the shaft of the drive wheel, with the first transmission gear meshing with the second gear.

[0056] Please see Figure 5 , Figure 8 and Figure 9 As shown, the aforementioned buffer brake mechanism 450 includes: a sliding member 452, at least one biasing member 453, and a limiting member 451. The limiting member 451 is fixedly disposed outside the end of the rack 410. The sliding member 452 is slidably disposed between the limiting member 451 and the end of the rack 410. The two ends of the biasing member 453 are respectively connected to the limiting member 451 and the sliding member 452.

[0057] The slider 452, the limiting member 451, and the rack 410 are approximately located on the extension of the same straight line. It should be noted that in this specification, "approximately" or "basically" can be understood as close to, approximately, or within a predetermined range from the target value.

[0058] The slider 452 has an initial position at the end away from the rack 410 and a critical position at the end near the rack 410. See also... Figure 11 and Figure 12 As shown, the initial position is the position where the slider 452 abuts against the limiting member 451 under the action of the biasing member 453, and a gap is reserved between the slider 452 and the end of the rack. Wherein, as Figure 13 and Figure 14 As shown, the critical position is the position when the ends of the slider 452 and the rack 410 abut against each other, or the critical position is the position when there is a preset gap between the ends of the slider 452 and the rack 410.

[0059] In this invention, the rack 410 and the limiting member 451 are fixedly mounted on the main body 110 (mentioned below). The main body 110 can be a base, or on the housing using the buffer mechanism, or on other components, as long as there is a structure for mounting the rack and the limiting member.

[0060] Preferably, the slider 452 is plate-shaped, i.e., a slider, but it can also be other shapes. The slider 452 is slidably disposed on the main body component 110. For example, Figure 10 As shown, the main body component 110 is provided with a groove 412 extending along the sliding direction of the slider 452, and both the slider 452 and the biasing member 453 are disposed in the groove. The biasing member 453 is a compression spring, which is used to apply a biasing force to the slider 452, forcing the slider 452 to tend to remain in the initial position.

[0061] Preferably, such as Figure 9 As shown, the slider 452 is provided with a locking portion 4522, through which the slider 452 is slidably connected to the slide groove. The locking portion 4522 also serves to prevent the slider 452 from falling off the slide groove. The slider 452 is located outside the opening of the slide groove 412 and is used to support the drive wheel 420. A side groove 4523 is formed on the locking portion 4522, extending along the sliding direction of the slider 452. The side groove 4523 serves to allow space for the locking portion 4522 to engage with the slide groove 412.

[0062] The aforementioned groove 412 can be directly provided on the main body component 110 or indirectly provided on the main body component 110. When the groove 412 is directly provided on the main body component 110, it means that the groove 412 is directly recessed into the outer wall of the main body component 110; when the groove 412 is indirectly provided on the main body component 110, it means that the groove 412 is provided on other components, and these other components are provided on the main body component 110.

[0063] Appendix Figure 10 This refers to the case where the slide groove 412 is indirectly provided on the main body component 110. In this case, the rack 410, slide groove 412, and limiting member 451 are provided on the same part. The outer wall of the main body component 110 has a long, narrow mounting opening that mates with the aforementioned parts. Thus, during installation, only this part containing the rack 410, slide groove 412, and limiting member 451 needs to be installed at the mounting opening of the main body component 110, effectively reducing the number of parts, simplifying the installation process, and providing the advantage of convenient installation.

[0064] Please continue reading. Figure 10 As shown, specifically, the rack 410 is fixedly mounted on the base 413, the base 413 has a recessed groove 412, and the end of the base 413 has a limiting member 451. The rack 410 is located between the two grooves 412, and the limiting member 451 is located on the side of the groove 412 away from the end of the rack 410.

[0065] To ensure that the first tooth 4521 of the slider 452 can mesh with the third tooth 421 of the drive wheel 420 when in the initial position, in this invention, the tooth thickness of the first tooth 4521 of the slider 452 is equal to the tooth thickness of the second tooth 411 of the rack 410, and in the initial position, the distance between the first tooth 4521 on the slider 452 and the second tooth 411 at the upper end of the rack 410 is an integer multiple of the aforementioned tooth thickness. For example, one, two, three, or more times are all acceptable, and the specific multiple is not limited.

[0066] Specifically, the slider 452 is provided with at least one first tooth 4521, and the slider 452 is slidably disposed outside one end of the rack 410 along the length direction of the rack 410.

[0067] In the initial position, the first tooth 4521 of the slider 452 can mesh with the third tooth of the drive wheel 420 in either a forward or reverse direction. To facilitate understanding of the direction of movement of the drive wheel 420, only the buffer brake mechanism 450 located at one end of the rack 410 will be described here. Specifically, forward meshing is defined as the drive wheel 420 moving from the rack 410 towards the slider 452 (i.e., in...). Figure 11 (From right to left); the above reverse meshing is defined as the movement of the drive wheel 420 from the slider 452 toward the rack 410 (i.e., in... Figure 11 (From left to right in the middle).

[0068] The power supply unit supplies positive power to the DC motor. Driven by the DC motor, the drive wheel 420 rotates in the forward direction and meshes with the rack in the forward direction, moving from right to left. During this process, the slider remains in the initial position. Since the distance between the first tooth 4521 and the second tooth 411 at the upper end of the rack 410 is an integer multiple of the tooth thickness, when the drive wheel 420 runs to one end of the rack 410, as the drive wheel continues to rotate, the drive wheel 420 gradually disengages from the rack 410 and meshes with the first tooth on the slider 452 in the forward direction.

[0069] Please continue reading. Figure 11 and Figure 13 As shown, after the drive wheel 420 engages with the slider 452, since the drive wheel 420 is constantly rotating, the third tooth of the drive wheel 420 gradually disengages from the first tooth of the slider 452. During this process, the slider remains in its initial position. When the third tooth of the drive wheel 420 disengages from the first tooth of the slider 452, the initial position is reached. Figure 13 When the indicated position is reached, the power supply unit continues to supply positive current to the DC motor, and the drive wheel 420 continues to rotate in the forward direction. Since the teeth on the drive wheel disengage from the first tooth, the drive wheel slips on the sliding member 452. At this time, the current of the DC motor 430 decreases. After the detector detects the signal of the reduced current, it sends a signal to the controller. Based on the signal of the reduced current, the controller controls the power supply unit to stop supplying positive current to the DC motor 430, that is, to cut off the power.

[0070] However, due to inertia, the DC motor 430 will not stop rotating immediately, and the drive wheel 420 will continue to rotate under the action of the DC motor 430. At this time, the drive wheel 420 is still spinning on the sliding member 452 until the inertial energy of the DC motor 430 is exhausted, at which point the drive wheel 420 stops rotating. Thus, the buffer brake mechanism 450 releases the inertial energy of the DC motor 430 while achieving motion limit, effectively avoiding damage to the DC motor 430 and the drive wheel 420.

[0071] In the above process, when the slider 452 has only one first tooth 4521, the time required for the drive wheel 420 to disengage from the slider 452 after it engages with the drive wheel 420 is S1; when the slider 452 has two first teeth 4521, the time required for the drive wheel 420 to disengage from the slider 452 after it engages with the drive wheel 420 is S2, where S2 is greater than S1; when the slider 452 has three first teeth 4521, the time required for the drive wheel 420 to disengage from the slider 452 after it engages with the drive wheel 420 is S3, where S3 is greater than S2.

[0072] It can be seen that the more teeth 4521 there are on the slider 452, the longer it takes for the drive wheel 420 to disengage from the slider 452, and the longer it takes for the drive wheel 420 to achieve free-spinning and slippage, which is not conducive to the braking limit of the buffer brake mechanism 450.

[0073] In this embodiment, the number of first teeth 4521 is 1 to 3; preferably, the number of first teeth 4521 is 1.

[0074] It is worth noting that before the drive wheel 420 disengages from the slider 452, the position of the slider 452 remains unchanged. However, when the drive wheel 420 disengages and slips, the slider 452, under the combined action of the drive wheel 420 and the biasing member 453, reciprocates between its initial and critical positions. That is, the slider, under the influence of the biasing member, tends to move towards its initial position, while the drive wheel, spinning freely on the slider, generates friction that drives the slider towards its critical position.

[0075] Specifically, the biasing member 453 is used to provide a biasing force that keeps the sliding member 452 in its initial position. This biasing force causes the sliding member 452 to have a motion tendency toward the limiting member 451. During the slippage process of the drive wheel, the sliding member 452 is subjected to the biasing force of the biasing member 453, so that the first tooth 4521 of the sliding member 452 always abuts against the third tooth 421 at the end of the drive wheel 420. Since the third tooth 421 is spiral, during the rotation of the drive wheel 420, the third tooth 421 abuts against the first tooth 4521. The sliding member 452 moves back and forth continuously to form a dynamic abutment with the third tooth 421 of the drive wheel 420 until the drive wheel stops rotating.

[0076] In other words, between the initial position and the critical position, the first tooth 4521 of the slider 452 disengages from the third tooth, causing the drive wheel 420 to slip on the slider 452, and the slider 452 moves back and forth between the critical position and the initial position under the action of the drive wheel 420 and the biasing member 453.

[0077] After the DC motor 430 is powered off and the drive wheel has released its inertial energy, the sliding member 452 can stop at the initial position, the critical position, or any position between the initial position and the critical position.

[0078] When it is necessary to move the drive wheel 420 from the slider 452 to the rack 410, the controller controls the power supply unit to supply reverse current to the DC motor, driving the DC motor 430 to rotate in the opposite direction, so that the teeth on the drive wheel 420 disengage from the first tooth on the slider 452 and switch to reverse engagement.

[0079] The specific process is as follows, please refer to [link / reference]. Figure 15 and Figure 16 As shown, when the drive wheel 420 engages in the opposite direction, under the action of the biasing member 453, the first tooth 4521 on the sliding member 452 can slide into the tooth groove on the drive wheel 420. Driven by the drive wheel 420, the sliding member 452 slides back to its initial position from the stop position. At this time, the sliding member 452 is abutting against the limiting member 451 and cannot continue to move, while the drive wheel 420 is still rotating. The first tooth 4521 on the sliding member 452 exerts a force on the drive wheel 420 towards the right. Under the action of this force, the drive wheel 420 rotates towards the rack 410 (right side). Finally, the drive wheel 420 disengages from the sliding member 452 and moves onto the rack 410. It can be seen that during the entire braking process, the drive wheel will not collide with the limiting member or other components adjacent to the sliding member, thus protecting the drive wheel.

[0080] In summary, the buffer brake mechanism 450 solves the inertia problem of the DC motor 430 in a way that does not damage the mechanical structure, and can effectively control the braking position of the drive wheel 420, thus having the advantage of good braking effect.

[0081] In this invention, please refer to Figure 17 and Figure 18 As shown, the aforementioned buffer brake mechanism 450 may not include the aforementioned limiting member 451. That is, the buffer brake mechanism 450 includes a sliding member 452 and at least one biasing member 453. In this case, the sliding member 452 is limited by the groove end Z of the slide groove 412 away from the rack 410. When the sliding member 452 slides to the groove end Z, the engaging portion 4522 located within the slide groove 412 abuts against the groove end Z, thereby limiting the movement limit position of the sliding member 452. The two ends of the biasing member 453 are respectively connected between the sliding member 452 and the other groove end of the slide groove 412. The initial position of the sliding member 452 is the position where the engaging portion 4522 abuts against the groove end Z.

[0082] Example 2

[0083] The present invention also provides a cleaning device, which, in an illustrative scenario, is an upright vacuum cleaner used for floor cleaning.

[0084] Please see Figures 1 to 3 As shown, the cleaning device includes: a main body 100, a drive structure disposed on the main body 100, a sliding frame 200 connected to the drive structure, and a main unit assembly 300 disposed on the sliding frame 200. The drive structure described above is the drive structure described in Embodiment 1.

[0085] The main body 100 includes a main body component 110, a handle 130 located near the proximal end of the main body component 110, and a floor brush unit 120 located at the distal end of the main body component 110. The main body component 110 has a suction channel communicating with the floor brush unit 120. The rack 410 in the aforementioned drive structure is fixed to the outer wall of the main body component 110. The sliding frame 200 is connected to the drive wheel 420 and reciprocates linearly on the rack 410 under the drive of the drive wheel 420.

[0086] The main unit 300 is mounted on the sliding frame 200 and moves linearly back and forth with the sliding frame 200. The main unit 300 includes a first motor that generates suction force to allow dust and air to enter the main unit 300 through the aforementioned suction channel. Thus, the user can adjust the position of the main unit 300 on the main body 100 according to changes in the usage environment.

[0087] Further, please refer to Figure 2 and Figure 3 As shown, the main body component 110 is also provided with a first opening 111 and a second opening 112 that are spaced apart along its length direction. The first opening 111 and the second opening 112 are respectively connected to the dust suction channel.

[0088] The sliding frame 200 has a first position where it operates to a first opening 111 and a second position where it operates to a second opening 112. When the sliding frame 200 is located at the first opening 111, the main unit 300 is connected to the dust collection channel through the first opening 111; when the sliding frame 200 is located at the second opening 112, the main unit 300 is connected to the dust collection channel through the second opening 112.

[0089] Specifically, the main unit 300 is also provided with an air inlet (not shown in the figure). When the sliding frame 200 and the main unit 300 are in the first position, the air inlet is connected to the dust suction channel through the first opening 111, and at this time, the second opening 112 is closed. When the sliding frame 200 and the main unit 300 are in the second position, the air inlet is connected to the dust suction channel through the second opening 112, and at this time, the first opening 111 is closed.

[0090] In this embodiment, the buffer brake mechanism 450 in the drive structure is disposed on the outer wall of the main body component 110 for braking the slide frame 200. The buffer brake mechanism 450 enables the slide frame 200 to stop precisely at the first or second position, providing the advantage of reliable movement.

[0091] The above is only one specific embodiment of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A buffer brake mechanism for braking a drive mechanism, the drive mechanism comprising a rack (410), a drive wheel (420) meshing with the rack (410), and a drive assembly for driving the drive wheel to rotate to perform reciprocating linear movement on the rack, the drive assembly comprising at least a DC motor (430); characterized in that, The buffer braking mechanism includes: A slider (452) is slidably disposed outside one end of the rack (410) along the length direction of the rack (410), and the slider (452) is provided with at least one first tooth (4521); the tooth thickness of the first tooth (4521) is equal to the tooth thickness of the second tooth (411) of the rack (410); The slider (452) has an initial position away from the end of the rack (410) and a critical position near the end of the rack (410); in the initial position, the distance between the first tooth (4521) and the second tooth (411) at the upper end of the rack (410) is an integer multiple of the tooth thickness; At least one biasing element (453) applies a biasing force to the slider (452), forcing the slider (452) to tend to remain in the initial position; In the initial position, the first tooth (4521) of the slider (452) can engage with the third tooth (421) of the drive wheel (420) in either the forward or reverse direction; between the initial position and the critical position, the first tooth (4521) of the slider (452) disengages from the third tooth (421), causing the drive wheel (420) to slip on the slider (452), and the slider (452) reciprocates between the critical position and the initial position under the action of the drive wheel (420) and the biasing member (453); The buffer brake mechanism further includes a limiting member (451), which is fixedly disposed outside the end of the rack (410), and the sliding member (452) is slidably disposed between the limiting member (451) and the end of the rack (410); or, The buffer brake mechanism also includes a main body component, which is fixedly mounted on the rack (410). The sliding member (452) is slidably mounted on the main body component. The main body component is provided with a groove (412) extending along the sliding direction of the sliding member (452). The sliding member (452) is limited by the groove end of the groove (412) away from the rack (410).

2. The buffer braking mechanism as described in claim 1, characterized in that, The two ends of the biasing member (453) are respectively connected to the limiting member (451) and the sliding member (452).

3. The buffer braking mechanism according to claim 1, characterized in that, Also includes: The limiting member (451) is fixed on the main body component.

4. The buffer braking mechanism according to claim 1, characterized in that, Both the sliding member (452) and the biasing member (453) are disposed within the sliding groove (412).

5. The buffer braking mechanism as described in claim 4, characterized in that, The biasing element (453) is a compression spring; and / or The sliding member (452) is in the form of a plate.

6. A driving structure, characterized in that, Includes a drive mechanism and at least one buffer brake mechanism as described in any one of claims 1-5; The drive mechanism includes a rack (410), a drive wheel (420) meshing with the rack (410), and a drive assembly for driving the drive wheel (420) to rotate so as to reciprocate linearly on the rack (410). The drive assembly includes at least a DC motor (430).

7. The driving structure according to claim 6, characterized in that, The buffer braking mechanism consists of two parts, which are respectively located at the ends of the rack (410).

8. The driving structure according to claim 6, characterized in that, The extension direction of the rotation axis of the drive wheel (420) is parallel to the extension direction of the rack (410); or, The direction of the rotation axis of the drive wheel (420) is perpendicular to the direction of the rack (410).

9. The driving structure according to any one of claims 6-8, characterized in that, Also includes: A detector, connected to the DC motor (430), is used to detect the current of the DC motor (430); A power supply unit is used to supply power to the DC motor (430); The controller is connected to the detector and the power supply unit.

10. A cleaning device, characterized in that, include: The body (100) has a main component, the main component having a dust suction channel; The drive structure according to any one of claims 6-9, wherein the rack (410) is fixed to the outer wall of the main body component; The sliding frame (200) is connected to the drive wheel (420) and is driven by the drive wheel (420) to reciprocate linearly on the rack (410); A main unit (300) is disposed on the sliding frame (200), the main unit (300) including a first motor; the first motor is used to generate suction force so that dust and air enter the main unit through the dust suction channel.

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