A back massager host up-and-down electric moving device and a back massager with the same

Abstract

The utility model discloses a kind of back rubbing machine host upper and lower electric moving device and the back rubbing machine with it, the moving device includes base, host bottom shell, lifting drive mechanism, lifting drive gear and rack, base is equipped with T-shaped slide, the T-shaped foot of host bottom shell bottom and T-shaped slide clearance fit, lifting drive mechanism is driven lifting drive gear and rack engagement through second transmission shaft, realize host bottom shell electric lifting.T-shaped slide and T-shaped foot are oriented stable, trapezoidal groove and compact point ensure that rack is fixed reliably, second shaft sealing ring protection prevents damp, limit structure guarantees operation safety.Back rubbing machine formed on this basis, integrated electric movement, circumferential rotation back rubbing and vacuum adsorption function, can accurately adjust height, adapt to different user needs, realize stable, efficient back cleaning.The utility model solves the problem that traditional back rubbing machine is inconvenient to adjust, poor stability etc., with the advantages of convenient operation, reliable structure, good use experience etc.

Description

Technical Field

[0001] This utility model belongs to the technical field of back rubbing equipment, specifically relating to a back rubbing machine main unit with an electric up-and-down moving device and a back rubbing machine having the same. Background Technology

[0002] In the field of personal hygiene and care equipment, back scrubbers, as tools to assist in back cleaning, are receiving increasing attention for their ease of use and adjustability, while the up-and-down movement function of the main unit is key to achieving personalized use.

[0003] Existing back scrubbers have several shortcomings in height adjustment. Some products use a fixed installation method, preventing users from adjusting the scrubber's position according to their height and the areas to be cleaned, leading to blind spots or inconvenience during cleaning. Other scrubbers, while having vertical movement capabilities, rely heavily on manual adjustment, such as screw fixing or clip-on limiting. Each adjustment requires manually tightening screws or repeatedly inserting and removing clips, making operation cumbersome and time-consuming, failing to meet users' needs for quick and convenient adjustment. Furthermore, some electrically adjustable scrubbers use chain or belt drive mechanisms, resulting in poor stability during operation, prone to vibration and excessive noise. Over time, chains and belts are susceptible to wear and breakage, leading to low reliability and increased maintenance costs and usage risks. Therefore, developing a conveniently adjustable and stable electrically movable vertical movement mechanism for the main unit of a scrubber is of significant practical importance. Utility Model Content

[0004] Therefore, this utility model provides an electric moving device for the main body of a back-rubbing machine and a back-rubbing machine having the same, which solves the problems of inconvenient height adjustment, cumbersome operation and poor stability of traditional back-rubbing machines.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a back-rubbing machine main unit up and down electric moving device, including a base, a main unit bottom shell, a lifting drive mechanism, a lifting drive gear and a rack;

[0006] The base is provided with a T-shaped slide rail, and the bottom of the main unit's bottom shell is provided with a T-shaped foot that fits with the T-shaped slide rail with a clearance.

[0007] The lifting drive mechanism is connected to the lifting drive gear via a second transmission shaft, and the lifting drive gear meshes with the rack fixed on the base.

[0008] As a preferred embodiment of the electric moving device for the back-rubbing machine main unit, the end of the T-shaped foot extends into the mounting groove at the bottom of the main unit's bottom shell.

[0009] As a preferred embodiment of the electric moving device for the back-rubbing machine main unit, a second shaft sealing ring is provided on the periphery of the second drive shaft.

[0010] As a preferred embodiment of the electric moving device for the back scrubbing machine main unit, the base has a trapezoidal groove on the inner side of its front, and the trapezoidal groove is fitted with the trapezoidal part of the rack with zero clearance.

[0011] As a preferred embodiment of the electric moving device for the back-rubbing machine main unit, a clamping point is provided on one side of the trapezoidal groove to fix the rack.

[0012] As a preferred embodiment of the electric moving device for the back-rubbing machine main unit, the lifting drive mechanism is a variable speed motor, which can adjust the lifting speed of the main unit's bottom shell.

[0013] As a preferred embodiment of the electric moving device for the back-rubbing machine main unit, the two ends of the T-shaped slide are provided with limiting structures to restrict the lifting stroke of the main unit's bottom shell.

[0014] This utility model also provides a back-rubbing machine, including the up-and-down electric moving device of the back-rubbing machine main unit of any of the above-mentioned components, and further including a rotary back-rubbing device and an electric automatic vacuum device.

[0015] As a preferred embodiment of the back-rubbing machine, the rotary back-rubbing device includes a back-rubbing disc, a main unit panel, a crankshaft bracket, a back-rubbing drive gear, a crankshaft gear, and a back-rubbing drive mechanism.

[0016] The crankshaft bracket includes an eccentric crankshaft shaft and a central crankshaft shaft. The central crankshaft shaft passes through the main unit panel and is fixedly connected to the crankshaft gear. The crankshaft gear meshes with the back-rubbing drive gear, and the back-rubbing drive gear is connected to the drive end of the back-rubbing drive mechanism.

[0017] The eccentric crankshaft is dynamically connected to the back-rubbing disc, and the eccentric crankshaft is parallel to the central crankshaft axis. The back-rubbing drive mechanism causes the back-rubbing disc to rotate around the central crankshaft axis through the back-rubbing drive gear and the crankshaft gear.

[0018] As a preferred embodiment of the back-rubbing machine, the electric automatic vacuum device includes a vacuum disc; the bottom of the vacuum disc forms a cavity with the wall through a vacuum sealing ring, and the cavity is connected to the first port of the first vacuum tube through a first filter screen;

[0019] The second, third, and fourth ports of the first vacuum tube are respectively connected to a vacuum sensor, a vent valve, and a check valve; the check valve is connected to the vacuum pump through the second vacuum tube; the vacuum sensor controls the start and stop of the vacuum pump according to the vacuum value of the cavity; the vent valve is connected to the external atmospheric environment through a vent pipe and a second filter.

[0020] The vacuum pump is connected to the vent pipe; the first filter screen filters impurities drawn into the cavity, and the filter screen filters outside air entering the cavity when the vent valve is opened;

[0021] The vent valve is in manual control mode. When the vent valve is opened, the power supply to the vacuum sensor and the vacuum pump is cut off, allowing outside air to enter the cavity through the vent valve to balance the pressure.

[0022] The beneficial effects of this utility model are as follows:

[0023] First, the lifting drive mechanism uses a rack and pinion drive to electrically move the bottom shell of the main unit up and down without manual operation. The height of the back scrubber can be quickly and accurately adjusted to suit users of different heights and the needs of the back cleaning area.

[0024] Secondly, the clearance fit between the T-shaped slide and the T-shaped foot forms a reliable guide, preventing the main unit's bottom shell from shifting or shaking during lifting and lowering; the zero-clearance assembly and clamping point design of the trapezoidal groove and rack enhance the rack's fixing stability, prevent loosening during transmission, and ensure smooth and reliable lifting and lowering movement.

[0025] Third, the second shaft seal ring around the second drive shaft can effectively prevent moisture from entering the motor, improving the durability of the device in humid environments and extending its service life.

[0026] Fourth, as one of the core components of the back scrubber, it works in conjunction with the rotary back scrubbing device and the electric automatic vacuum device to form a complete back scrubbing solution, achieving multiple functions such as flexible adjustment of cleaning position, stable adsorption and efficient cleaning, thereby enhancing the user experience. Attached Figure Description

[0027] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0028] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0029] Figure 1 A schematic diagram of the structure of the electric moving device for the back scrubbing machine main unit provided in this embodiment of the utility model;

[0030] Figure 2A schematic diagram of the overall structure of the back-rubbing machine with a main unit electric up-and-down moving device provided in this embodiment of the utility model;

[0031] Figure 3 A schematic diagram of the structure of the rotary back-rubbing device of the back-rubbing machine provided in the embodiment of this utility model;

[0032] Figure 4 This is a schematic diagram of the lifting design of the back scrubbing machine provided in an embodiment of the present utility model;

[0033] Figure 5 A schematic diagram of a first possible design of the crankshaft bracket assembly provided in an embodiment of this utility model;

[0034] Figure 6 A schematic diagram illustrating a second possible design of the crankshaft bracket assembly provided in this embodiment of the present utility model;

[0035] Figure 7 This is a schematic diagram of a third possible design for the crankshaft bracket assembly provided in an embodiment of the present utility model.

[0036] In the picture:

[0037] A1. Back-rubbing disc; A2. Main unit front panel; A3. Main unit middle layer; A4. Main unit bottom shell; A5. Base;

[0038] B. Crankshaft bracket; B1. Crankshaft eccentric shaft; B2. Crankshaft central shaft; B3. Snap ring; B4. Second bearing;

[0039] C1, back-rubbing drive gear; C2, crankshaft gear; C3, back-rubbing drive mechanism;

[0040] D1, First filter screen; D2, Vacuum sensor; D3, Vent valve; D4, Check valve; D5, Vacuum pump; D6, Second filter screen; D7, First vacuum tube; D8, Second vacuum tube; D9, Vent pipe;

[0041] E1, First bearing; E2, Crankshaft seal ring;

[0042] F1, Vacuum disk; F2, Vacuum sealing ring; F3, Cavity; F4, Wall;

[0043] H1, Lifting drive mechanism; H21, First drive shaft; H22, Second drive shaft; H3, Lifting drive gear; H4, Rack; H51, First shaft seal ring; H52, Second shaft seal ring; H6, Mounting groove;

[0044] T1, T-shaped foot; T2, T-shaped slide; T3, trapezoidal groove;

[0045] X, pressing point. Detailed Implementation

[0046] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] See Figure 1 This utility model embodiment provides an electric up-and-down movement device for a back-rubbing machine main unit. The electric up-and-down movement device includes a base A5, a main unit bottom shell A4, a lifting drive mechanism H1, a lifting drive gear H3, and a rack H4. The base A5 is provided with a T-shaped slide T2, and the bottom of the main unit bottom shell A4 is provided with a T-shaped foot T1 that is clearance-fitted with the T-shaped slide T2. The end of the T-shaped foot T1 extends into the mounting groove H6 at the bottom of the main unit bottom shell A4. The lifting drive mechanism H1 is connected to the lifting drive gear H3 through a second transmission shaft H22, and the lifting drive gear H3 meshes with the rack H4 fixed on the base A5. A second shaft sealing ring H52 is provided around the second transmission shaft H22.

[0048] Specifically, after the lifting drive mechanism H1 is activated, it drives the lifting drive gear H3 to rotate via the second transmission shaft H22. The lifting drive gear H3 meshes with the rack H4 fixed on the base A5, converting the rotational motion of the lifting drive mechanism H1 into linear motion, thereby driving the main body base A4 to move up and down along the T-shaped slide rail T2 of the base A5. The clearance fit between the T-shaped foot T1 and the T-shaped slide rail T2 forms a mechanical guide, ensuring that the main body base A4 moves smoothly and without deviation during lifting. The mounting groove H6 enhances structural stability by fixing the end of the T-shaped foot T1. The second shaft sealing ring H52 prevents moisture from entering the motor, improving the durability of the back scrubber in humid environments.

[0049] In this embodiment, a trapezoidal groove T3 is provided on the inner side of the front of the base A5. The trapezoidal groove T3 is assembled with the trapezoidal part of the rack H4 with zero clearance. A clamping point X is provided on one side of the trapezoidal groove T3 to fix the rack H4.

[0050] Specifically, the trapezoidal groove T3 and the trapezoidal portion of the rack H4 are fitted with zero clearance. Utilizing the inclined structure of the trapezoidal surface, the horizontal force generated during gear meshing is converted into a normal force perpendicular to the inclined surface, increasing friction to prevent lateral movement of the rack H4. The clamping point X further locks the position of the rack H4 with mechanical pressure (such as screw tightening) to prevent loosening due to vibration during long-term use, ensuring the stability and accuracy of the lifting movement.

[0051] See Figure 2 , Figure 3 and Figure 4 This utility model embodiment provides a back-rubbing machine including the above-mentioned back-rubbing machine main unit up and down electric moving device, the back-rubbing machine also includes a rotary back-rubbing device; the rotary back-rubbing device includes a back-rubbing disc A1, a main unit panel A2, a crankshaft bracket B, a back-rubbing drive gear C1, a crankshaft gear C2 and a back-rubbing drive mechanism C3;

[0052] The crankshaft bracket B includes an eccentric crankshaft shaft B1 and a central crankshaft shaft B2. The central crankshaft shaft B2 passes through the main unit panel A2 and is fixedly connected to the crankshaft gear C2. The crankshaft gear C2 meshes with the back-rubbing drive gear C1, and the back-rubbing drive gear C1 is connected to the drive end of the back-rubbing drive mechanism C3. The eccentric crankshaft shaft B1 is dynamically connected to the back-rubbing disc A1. The eccentric crankshaft shaft B1 is parallel to the central crankshaft shaft B2. The back-rubbing drive mechanism C3 causes the back-rubbing disc A1 to rotate around the central crankshaft shaft B2 through the back-rubbing drive gear C1 and the crankshaft gear C2.

[0053] Specifically, the back-rubbing drive mechanism C3 drives the crankshaft gear C2 to rotate via the back-rubbing drive gear C1. The crankshaft gear C2 is fixed to the main unit panel A2 via the crankshaft central shaft B2, forming a fixed rotation center. Because the crankshaft eccentric shaft B1 is parallel to and eccentrically offset from the crankshaft central shaft B2, when the crankshaft gear C2 rotates, the crankshaft eccentric shaft B1 drives the back-rubbing disc A1 to perform circular motion around the crankshaft central shaft B2, rather than the traditional rotational motion. This motion ensures that all points on the back-rubbing disc A1 are at the same distance from the rotation center, resulting in the same trajectory length for each point. This avoids the problem of uneven cleaning force between the center and edges of the traditional back-rubbing disc A1, simulating a uniform kneading effect similar to massage.

[0054] In this embodiment, the back-rubbing machine also includes an electric automatic vacuum device; the electric automatic vacuum device includes a vacuum disc F1; the bottom of the vacuum disc F1 forms a cavity F3 with the wall F4 through a vacuum sealing ring F2, and the cavity F3 is connected to the first port of the first vacuum tube D7 through a first filter D1; the second port, third port, and fourth port of the first vacuum tube D7 are respectively connected to a vacuum sensor D2, a vent valve D3, and a one-way valve D4; the one-way valve D4 is connected to the vacuum pump D5 through a second vacuum tube D8; the vacuum sensor D2 measures the vacuum value of the cavity F3. The vacuum pump D5 is controlled to start and stop; the vent valve D3 is connected to the outside atmosphere through the vent pipe D9 and the second filter D6; the vacuum pump D5 is connected to the vent pipe D9; the first filter D1 filters impurities sucked into the cavity F3, and the second filter D6 is used to filter the outside air entering the cavity F3 when the vent valve D3 is open; the vent valve D3 is in manual control mode, and when the vent valve D3 is open, the power supply to the vacuum sensor D2 and the vacuum pump D5 is cut off, allowing outside air to enter the cavity F3 through the vent valve D3 to balance the pressure.

[0055] Specifically, after vacuum pump D5 starts, it draws air from cavity F3, creating negative pressure within F3. Atmospheric pressure then secures the back-rubbing machine to the wall F4. Vacuum sensor D2 monitors the vacuum level of cavity F3 in real time. When the vacuum level falls below a set value, vacuum pump D5 automatically starts to replenish air; when it rises above the set value, it stops, maintaining stable suction. One-way valve D4 prevents gas backflow during replenishment, ensuring vacuum stability. Manually opening the vent valve D3 allows outside air to enter cavity F3 to balance the pressure, simultaneously cutting off the power for tool-free, quick disassembly. First filter D1 and second filter D6 filter the gas passing through their respective filters, preventing impurities from clogging the pipes and polluting the environment.

[0056] In this embodiment, a crankshaft sealing ring E2 and a first bearing E1 are provided at the connection between the crankshaft bracket B and the main unit panel A2.

[0057] Specifically, the crankshaft seal E2 is made of elastic material and fits tightly against the connection between the crankshaft center shaft B2 and the main unit panel A2 to prevent water vapor from seeping into the main unit during showering, thus avoiding short circuits or mechanical corrosion. The first bearing E1 (such as a deep groove ball bearing) is installed between the crankshaft center shaft B2 and the main unit panel A2, using rolling friction instead of sliding friction to reduce transmission losses, making the crankshaft center shaft B2 rotate more smoothly, and reducing noise.

[0058] In this embodiment, a second bearing B4 is provided at the bottom of the back-rubbing disc A1, and a connecting hole is formed between the inner hole of the back-rubbing disc A1 and the second bearing B4. The inner diameter of the connecting hole is larger than the outer diameter, and a transition slope is provided between the inner and outer diameters of the connecting hole. The outer diameter of the connecting hole is slightly larger than the outer diameter of the crankshaft eccentric shaft B1.

[0059] Specifically, the outer diameter of the connecting hole is slightly larger than the outer diameter of the crankshaft eccentric shaft B1, facilitating quick alignment and insertion; the inner diameter is larger and has a transition ramp. When the crankshaft eccentric shaft B1 is inserted, the retaining ring B3 is compressed along the ramp. After insertion, the inner diameter expands, causing the retaining ring B3 to spring back and lock into the inner step of the connecting hole, achieving "insertion and locking". The second bearing B4 allows the back-rubbing disc A1 to rotate slightly on the crankshaft eccentric shaft B1, compensating for crankshaft machining errors or installation deviations, and avoiding jamming or wear caused by rigid connection.

[0060] In this embodiment, the crankshaft eccentric shaft B1 is provided with a retaining ring B3 groove, and a retaining ring B3 is installed in the retaining ring B3 groove; the outer diameter of the retaining ring B3 is normally larger than the outer diameter of the crankshaft eccentric shaft B1, and is equal to or larger than the inner diameter of the connecting hole.

[0061] Specifically, the retaining ring B3 is an elastic element, and its outer diameter is larger than the inner diameter of the connecting hole under normal conditions. When the back-rubbing disc A1 is inserted, the retaining ring B3 is compressed due to the smaller outer diameter. After entering the inner hole, because the inner diameter matches the outer diameter of the retaining ring B3, the retaining ring B3 springs back and locks into the step of the connecting hole, forming a mechanical lock to prevent the back-rubbing disc A1 from falling off. During disassembly, the back-rubbing disc A1 is pulled outward, and the retaining ring B3 is compressed again to disengage. No tools are required, making it easy to replace or clean.

[0062] In one possible embodiment, the back-rubbing drive mechanism C3 is connected to the back-rubbing drive gear C1 via a first drive shaft H21. The back-rubbing drive gear C1 meshes with at least two crankshaft gears C2, and the crankshaft gears C2 independently drive the corresponding crankshaft brackets B. A first shaft seal ring H51 is provided around the first drive shaft H21.

[0063] Specifically, a single back-rubbing drive mechanism C3 simultaneously drives multiple crankshaft gears C2 through a back-rubbing drive gear C1. Each crankshaft gear C2 independently drives its corresponding crankshaft bracket B, achieving synchronous movement of multiple back-rubbing discs A1. This design simplifies the transmission structure and reduces costs. The first shaft seal ring H51 seals the gap between the drive shaft and the main unit panel A2, preventing moisture from entering and protecting internal components.

[0064] See Figure 5 In one possible embodiment, the crankshaft bracket assembly is at least one set, and the eccentricity direction and the direction of movement of each set of crankshaft eccentric shafts B1 are consistent.

[0065] Specifically, the crankshaft eccentric shafts B1 in the same group are offset in the same direction (e.g., all to the left or all to the right) and rotate in the same direction (all clockwise or all counterclockwise), so that the circular motion trajectory of the back-rubbing discs A1 in the group is synchronized, producing consistent back-rubbing force and direction, which is suitable for large-area uniform cleaning of the back, such as unidirectional rubbing from bottom to top or from left to right.

[0066] See Figure 6 In one possible embodiment, at least one set of the back-rubbing discs A1 is provided, and each set of the back-rubbing discs A1 and at least two crankshaft brackets B form a crankshaft bracket group. The eccentric direction of the crankshaft eccentric shaft B1 of the same set of crankshaft brackets B is consistent, and the eccentric direction and movement direction of the crankshaft brackets B of different sets are set independently.

[0067] Specifically, the crankshaft brackets B in different groups can be independently set with eccentric direction and movement direction. For example, one group of eccentric shafts can rotate clockwise to the left, while another group can rotate counterclockwise to the right. This design allows the movement trajectories of different groups of back-rubbing discs A1 to form interlaced or opposing movements, simulating the "kneading" action of manual massage, enhancing the cleaning effect on complex areas such as the shoulders, neck, and both sides of the spine, and adapting to different body types and cleaning needs.

[0068] See Figure 7 In one possible embodiment, each crankshaft bracket group is equipped with an independent back-rubbing drive mechanism C3 to achieve independent control of the rotational speed and steering of different back-rubbing discs A1. Alternatively, multiple crankshaft bracket groups may be equipped with one back-rubbing drive mechanism C3.

[0069] Specifically, each independent back-rubbing drive mechanism C3 can have its speed and direction adjusted individually. For example, the high-speed mode is used for powerful cleaning of stubborn dirt, while the low-speed mode is used for gentle massage of sensitive skin. Clockwise or counterclockwise rotation can simulate different massage techniques. Users can switch modes according to their own needs to enhance the personalized experience and applicability of the product.

[0070] Among them, the back-rubbing drive mechanism C3 can be a drive motor or a geared motor. Each crankshaft bracket B can be equipped with a single drive motor or geared motor to drive multiple back-rubbing discs A1, or the back-rubbing discs A1 can be independently controlled by the corresponding drive motor or geared motor.

[0071] In actual massage, the techniques are relatively uniform and stable. When the length of the motion thread of all points on the back-rubbing disc A1 is consistent, it means that during the rotation of the back-rubbing disc A1, the distance of motion between each position on its surface and the human back is the same. There will be no situation where some areas are excessively rubbed and others are insufficiently rubbed. It can clean or massage the back more evenly, simulating the uniform and stable characteristics of massage movements in terms of motion effect, thus improving the user experience.

[0072] The working principle of this back-rubbing machine is as follows:

[0073] When the back-rubbing drive mechanism C3 is powered on, it begins to rotate, and its rotational power is transmitted to the back-rubbing drive gear C1 through the first transmission shaft H21. The back-rubbing drive gear C1 meshes with the crankshaft gear C2. Due to the principle of gear transmission, the rotation of the back-rubbing drive gear C1 drives the crankshaft gear C2 to rotate synchronously. The crankshaft central shaft B2 passes through the main unit panel A2 and is fixedly connected to the crankshaft gear C2, so the rotation of the crankshaft gear C2 drives the crankshaft central shaft B2 to rotate together. The crankshaft eccentric shaft B1 is parallel to the crankshaft central shaft B2, and the crankshaft eccentric shaft B1 is dynamically connected to the back-rubbing disc A1 (e.g., connected via a quick-connect interface). When the crankshaft central shaft B2 rotates, due to the relative positional relationship between the crankshaft eccentric shaft B1 and the crankshaft central shaft B2, the crankshaft eccentric shaft B1 will perform a circular motion around the crankshaft central shaft B2, thereby driving the back-rubbing disc A1 to perform a circular rotation around the crankshaft central shaft B2.

[0074] Let P be any point on the surface of the back-rubbing disc A1, and let L be the path length of P. Let R be the distance from the crankshaft central axis B2 to the crankshaft eccentric axis B1. During the rotation of the back-rubbing disc A1 around the crankshaft central axis B2, the path length of any point P on the surface of the back-rubbing disc A1 is L = 2Rπ, ensuring that the path length L of all points on the disc is consistent. In this way, when the back-rubbing disc A1 rotates, the distance of movement between each position and the human back is the same, simulating a uniform and stable effect similar to a massage, avoiding the problem of uneven cleaning force in traditional back-rubbing tools.

[0075] When the lifting drive mechanism H1 is energized, it transmits rotational power to the lifting drive gear H3 via the second transmission shaft H22. The lifting drive gear H3 meshes with the rack H4 fixed on the base A5. The rack and pinion transmission has the characteristic of converting rotational motion into linear motion. When the lifting drive gear H3 rotates under the drive of the lifting drive mechanism H1, the rotation of the gear causes the meshing rack H4 to produce linear motion due to the meshing relationship between the gear and the rack H4. The rack H4 is fixed on the base A5, and the main body shell A4 is fitted with the T-shaped slide T2 of the base A5 through a T-shaped foot T1. The end of the T-shaped foot T1 extends into the mounting groove H6 at the bottom of the main body shell A4. As the rack H4 moves linearly, the main body shell A4 moves smoothly up and down along the T-shaped slide T2, realizing the adjustment of the height of the back scrubbing machine. During this process, the cooperation between the T-shaped slide T2 and the T-shaped foot T1 plays a guiding role, ensuring that the main unit's bottom shell A4 will not shift or shake during the up and down movement; the second shaft seal ring H52 prevents moisture from entering the motor and protects the motor to work normally.

[0076] The base A5 has a trapezoidal groove T3 on its inner front side, and the trapezoidal part of the rack H4 is fitted into the trapezoidal groove T3 with zero clearance. This trapezoidal structure utilizes the friction of the inclined plane to effectively counteract the horizontal component force generated during gear meshing, preventing the rack H4 from shifting in the horizontal direction. At the same time, the clamping point X on one side of the trapezoidal groove T3 (e.g., by tightening with screws) further applies pressure to the rack H4, firmly fixing it to the base A5. This ensures that the rack H4 will not loosen during long-term use and frequent lifting movements, guaranteeing the stability and reliability of the entire main unit's electric up-and-down movement device.

[0077] When vacuum pump D5 starts, air is drawn from the cavity F3 formed by the bottom of vacuum disc F1 and wall F4 through one-way valve D4. As air is continuously drawn out, the pressure inside cavity F3 gradually decreases, creating a negative pressure environment. Meanwhile, the external atmospheric pressure remains constant, creating a pressure difference between the inside and outside of cavity F3. According to the pressure formula F = P × S (where P is the pressure difference and S is the contact area between vacuum disc F1 and the wall), under the action of this pressure difference, atmospheric pressure presses vacuum disc F1 tightly against the wall, thus achieving stable adsorption and fixation of the back-rubbing machine. Vacuum sensor D2 monitors the vacuum value inside cavity F3 in real time. When the vacuum value inside cavity F3 drops below the lower limit set by vacuum sensor D2 due to various reasons (such as slight air leakage), vacuum sensor D2 sends a signal to automatically start vacuum pump D5. Vacuum pump D5 then draws air into cavity F3 through one-way valve D4, causing the vacuum value inside cavity F3 to rise again. When the vacuum level rises to the set upper limit, vacuum sensor D2 sends a signal to control vacuum pump D5 to stop working. In this way, through the coordinated work of vacuum sensor D2 and vacuum pump D5, the vacuum level in cavity F3 can be automatically maintained within a certain range, ensuring the stability of the back-rubbing machine's adsorption.

[0078] The vent valve D3 is in manual control mode. When the back scrubber needs to be disassembled, the vent valve D3 is manually opened, allowing outside air to enter the cavity F3 through the vent pipe D9 and the second filter D6. Simultaneously, the opening of the vent valve D3 triggers circuit control, cutting off the power to the vacuum sensor D2 and the vacuum pump D5. As outside air continuously enters the cavity F3, the pressure inside the cavity F3 gradually balances with the external atmospheric pressure. At this point, the atmospheric pressure's suction force on the vacuum disc F1 disappears, allowing the back scrubber to be easily removed from the wall. A first filter D1 is located at the connection between the vacuum tube and the cavity F3. Its function is to filter impurities drawn into the cavity F3, such as dander, hair, and particles from water vapor generated during bathing, preventing these impurities from entering the vacuum tube, avoiding blockage, ensuring smooth airflow, and thus ensuring the normal operation of the vacuum adsorption function. A second filter D6 is located on the vent pipe D9, which connects the vent valve D3 to the outside atmosphere. When the vent valve D3 is open, it filters the outside air entering the cavity F3 through the vent pipe D9.

[0079] The method of using this back-rubbing machine is as follows:

[0080] First, installation and fixing.

[0081] Choose a location in the bathroom with a smooth, dry, and easily accessible wall surface. Check that all parts of the scrubber are in good working order, and that the surface of the vacuum disc (F1) and the contact area with the wall are free of debris and dust.

[0082] Turn on the power to the back scrubber and turn on the vacuum pump D5 switch. Vacuum pump D5, through one-way valve D4, draws air from the cavity F3 formed by the bottom of the vacuum disc F1 and the wall F4, gradually reducing the pressure inside cavity F3. As the pressure inside cavity F3 falls below the external atmospheric pressure, the vacuum disc F1 adheres tightly to the wall under atmospheric pressure. During this process, vacuum sensor D2 monitors the vacuum value of cavity F3 in real time. When the vacuum value reaches the set stable adsorption range, vacuum pump D5 stops working (if the vacuum value subsequently decreases, vacuum pump D5 will automatically start to replenish the air).

[0083] Second, adjust the height.

[0084] The user stands in front of the back scrubber and roughly estimates the appropriate height for cleaning their back. Generally, for adults, the center height of the back scrubber is about 1.5-1.6 meters from the ground, but this can be slightly adjusted according to the user's actual height.

[0085] Locate the lifting control button on the main unit panel A2 and press it. At this time, the lifting drive mechanism H1 is powered on and starts. The motor's rotational power is transmitted to the lifting drive gear H3 via the second transmission shaft H22. The lifting drive gear H3 meshes with the rack H4 fixed on the base A5. Due to the transmission relationship between the gear and rack H4, the main unit's base A4 moves smoothly up and down along the T-shaped slide rail T2 of the base A5. When the desired height is reached, release the button, the lifting drive mechanism H1 stops operating, and the back-rubbing machine is fixed at the corresponding height position.

[0086] Third, select mode

[0087] Depending on your preference for the intensity and speed of the back scrubbing, operate the speed adjustment button on the main unit panel A2. The speed adjustment button typically has multiple settings, such as low, medium, and high. When the low setting is selected, the back scrubbing drive mechanism C3 operates at a lower speed. Through the transmission of the back scrubbing drive gear C1 and crankshaft gear C2, the circular rotation speed of the back scrubbing disc A1 is slower, suitable for users with sensitive skin or those who prefer a gentle cleanse. When the high setting is selected, the speed of the back scrubbing drive mechanism C3 increases, the rotation speed of the back scrubbing disc A1 increases, and the cleaning intensity is enhanced, suitable for situations requiring a strong cleanse.

[0088] If the back-rubbing machine has more than one set of back-rubbing discs A1, and each set of crankshaft brackets B is equipped with an independent back-rubbing drive mechanism C3, the rotation direction of different sets of back-rubbing discs A1 can be set separately through corresponding control buttons. For example, one set of back-rubbing discs A1 can be set to rotate clockwise, and another set can rotate counterclockwise to simulate different massage techniques and meet diverse back-rubbing needs.

[0089] Fourth, begin rubbing the back.

[0090] The user stands with their back to the back scrubber, feet shoulder-width apart, adjusting their body position so that their back is fully in contact with the scrubbing disc A1. Pressing the start button on the main unit panel A2 activates the scrubbing drive mechanism C3. Power from the scrubbing drive mechanism C3 is transmitted to the scrubbing drive gear C1 via the first transmission shaft H21. The scrubbing drive gear C1 meshes with the crankshaft gear C2, causing the crankshaft gear C2 to rotate. Since the crankshaft central shaft B2 is fixedly connected to the crankshaft gear C2, and the crankshaft eccentric shaft B1 is dynamically connected to the scrubbing disc A1, and the crankshaft eccentric shaft B1 is parallel to the crankshaft central shaft B2, the scrubbing disc A1 rotates in a circular motion around the crankshaft central shaft B2, beginning the cleaning and massage of the user's back. During the scrubbing process, if the user feels that a certain area is not cleaned thoroughly enough or needs focused cleaning, they can adjust their body posture to ensure that different areas of their back are fully in contact with the scrubbing disc A1.

[0091] If you need to replace the back scrubber A1 with a different type (such as a softer or more powerful one), you can use the quick-release interface between the back scrubber A1 and the crankshaft eccentric shaft B1. Since the outer diameter of the connecting hole is slightly larger than the outer diameter of the crankshaft eccentric shaft B1, and it has an internal transition ramp and a retaining spring B3 structure, simply pull the back scrubber A1 outwards. The retaining spring B3 will be compressed, allowing you to remove the back scrubber A1. Then, align and insert the new back scrubber A1. The retaining spring B3 will spring back and lock into place on the inner step of the connecting hole, completing the replacement. To clean the back scrubber, after removing the back scrubber A1, wipe the main unit panel A2 and the mounting area of ​​the back scrubber A1 with a damp cloth. For crevices or hard-to-reach areas, use a small brush and cleaning agent.

[0092] Fifth, disassembly and storage

[0093] After use, locate the vent valve D3 and manually open it. Once D3 is open, outside air enters chamber F3 through vent pipe D9 and the second filter D6, simultaneously cutting off the power to vacuum sensor D2 and vacuum pump D5. As air enters, the pressure inside chamber F3 gradually equalizes with the outside atmospheric pressure. Once the pressure inside and outside chamber F3 is balanced, gently remove the back scrubber from the wall. Store the back scrubber in a dry, well-ventilated place. If it will not be used for a long time, consider placing it in a dedicated storage bag or box to prevent dust accumulation and damage to parts.

[0094] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A back-rubbing machine main unit with an electric up-and-down movement device, characterized in that, Includes base (A5), main unit bottom shell (A4), lifting drive mechanism (H1), lifting drive gear (H3) and rack (H4); The base (A5) is provided with a T-shaped slide (T2), and the bottom of the main unit shell (A4) is provided with a T-shaped foot (T1) that is in clearance fit with the T-shaped slide (T2). The lifting drive mechanism (H1) is connected to the lifting drive gear (H3) via the second transmission shaft (H22), and the lifting drive gear (H3) meshes with the rack (H4) fixed on the base (A5).

2. The back-rubbing machine main unit's up-and-down electric moving device according to claim 1, characterized in that, The end of the T-shaped foot (T1) extends into the mounting groove (H6) at the bottom of the main unit's bottom case (A4).

3. The back-rubbing machine main unit's up-and-down electric moving device according to claim 1, characterized in that, The second drive shaft (H22) is provided with a second shaft seal ring (H52) on its periphery.

4. The back-rubbing machine main unit's up-and-down electric moving device according to claim 1, characterized in that, The base (A5) has a trapezoidal groove (T3) on the inner side of its front, and the trapezoidal groove (T3) is assembled with the trapezoidal part of the rack (H4) with zero clearance.

5. The back-rubbing machine main unit's up-and-down electric moving device according to claim 4, characterized in that, The trapezoidal groove (T3) has a clamping point (X) on one side to fix the rack (H4).

6. The back-rubbing machine main unit's up-and-down electric moving device according to claim 1, characterized in that, The lifting drive mechanism (H1) is a variable speed motor, which can adjust the lifting speed of the main unit bottom shell (A4).

7. The back-rubbing machine main unit's up-and-down electric moving device according to claim 1, characterized in that, The two ends of the T-shaped slide (T2) are provided with limiting structures to restrict the lifting stroke of the main unit bottom shell (A4).

8. A back-rubbing machine, characterized in that, The back-rubbing machine includes the up-and-down electric moving device of the main body as described in any one of claims 1-7, and also includes a rotary back-rubbing device and an electric automatic vacuum device.

9. The back-rubbing machine according to claim 8, characterized in that, The rotary back-rubbing device includes a back-rubbing disc (A1), a main unit panel (A2), a crankshaft bracket (B), a back-rubbing drive gear (C1), a crankshaft gear (C2), and a back-rubbing drive mechanism (C3). The crankshaft bracket (B) includes a crankshaft eccentric shaft (B1) and a crankshaft central shaft (B2). The crankshaft central shaft (B2) passes through the main unit panel (A2) and is fixedly connected to the crankshaft gear (C2). The crankshaft gear (C2) meshes with the back-rubbing drive gear (C1), and the back-rubbing drive gear (C1) is connected to the drive end of the back-rubbing drive mechanism (C3). The crankshaft eccentric shaft (B1) is dynamically connected to the back-rubbing disc (A1), the crankshaft eccentric shaft (B1) is parallel to the crankshaft central shaft (B2), and the back-rubbing drive mechanism (C3) causes the back-rubbing disc (A1) to rotate around the crankshaft central shaft (B2) through the back-rubbing drive gear (C1) and the crankshaft gear (C2).

10. The back-rubbing machine according to claim 9, characterized in that, The electric automatic vacuum device includes a vacuum disk (F1); the bottom of the vacuum disk (F1) forms a cavity (F3) with the wall (F4) through a vacuum sealing ring (F2), and the cavity (F3) is connected to the first port of the first vacuum tube (D7) through a first filter (D1); The second, third, and fourth ports of the first vacuum tube (D7) are respectively connected to a vacuum sensor (D2), a vent valve (D3), and a one-way valve (D4); the one-way valve (D4) is connected to a vacuum pump (D5) through a second vacuum tube (D8); the vacuum sensor (D2) controls the vacuum pump (D5) to start and stop according to the vacuum value of the cavity (F3); the vent valve (D3) is connected to the external atmospheric environment through a vent pipe (D9) and a second filter (D6); The vacuum pump (D5) is connected to the vent pipe (D9); the first filter (D1) filters impurities drawn into the cavity (F3), and the second filter (D6) filters outside air entering the cavity (F3) when the vent valve (D3) is opened; The vent valve (D3) is in manual control mode. When the vent valve (D3) is opened, the power supply to the vacuum sensor (D2) and the vacuum pump (D5) is cut off, allowing outside air to enter the cavity (F3) through the vent valve (D3) to balance the pressure.

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