Shoe washing machine with upright post on impeller

Abstract

The shoe washing machine solves the problem that the connection stability of an existing stand column on the impeller is prone to being affected by objects to be washed and structurally comprises the impeller arranged at the bottom end of an inner cylinder, the stand column is connected to the axis position of the impeller, and a plurality of stirring ribs are arranged on the end face, facing the stand column, of the impeller. And the stirring ribs are radially arranged on the impeller. A mounting cavity is formed in the axis position of the impeller, and the lower end of the stand column is inserted into the mounting cavity. A connecting device is arranged between the lower end of the stand column and the installation cavity and comprises a connecting structure arranged on the lower end side of the stand column, and a clamping structure used for being connected with the connecting structure in a clamped mode is arranged at the position of the installation cavity. A limiting structure is movably arranged at the position of the mounting cavity and used for limiting circumferential rotation of the stand column relative to the impeller. The limiting structure is switched between the mode of preventing the connection structure from being separated from the clamping structure and the mode of releasing the connection structure from the clamping structure in the mode of moving in the axial direction of the installation cavity.

Description

Technical Field

[0001] This invention relates to a shoe washing machine, and more particularly to a shoe washing machine with a column on the impeller. Background Technology

[0002] Shoe washing machines are used to clean shoes. Inside the machine's inner drum is a cleaning assembly, including an impeller at the bottom of the drum. Sometimes, a vertical column is also installed at the impeller's axis. Protruding bristles are typically found on the outer circumference of the column and on the front of the impeller. When the impeller rotates, these bristles, along with those on the inner wall of the drum, clean the surface of the shoes inside. The column and impeller are generally connected in a detachable manner. The column can be fixed to the impeller with bolts or a snap-fit ​​connection. During operation, the impeller and column often reciprocate in both directions. Bolt connections are not well-suited to the rotation of the impeller and column, and the connection is prone to loosening. Snap-fit ​​connections often require a limiting structure to prevent relative circumferential loosening between the column and the impeller. Therefore, when the column and impeller are connected by a snap-fit ​​method, a limiting structure is generally required to limit the relative circumferential looseness between the column and the impeller, so as to achieve a tight connection between the column and the impeller.

[0003] Chinese patent document (publication number: CN 220675957U) discloses a cleaning component and a shoe washing machine, which includes a pulsator, a column, and a limiting device. The column is detachably mounted on the pulsator and has a plug-in part. The pulsator has a plug-in groove for the plug-in part to be inserted after rotation. When the plug-in part is inserted into the plug-in groove, the limiting device can restrict the circumferential rotation of the column. This application can improve the efficiency of replacing the column.

[0004] In this cleaning assembly, a cover-shaped connecting cover is formed at the lower end of the column. An insertion groove is provided on the protruding stirring ribs of the impeller. A limiting device is also provided on the impeller outside the connecting cover, used to limit the relative circumferential rotation between the column and the impeller. Because the limiting device is protruding on the impeller, on the one hand, this structure is relatively complex and installation is relatively troublesome; on the other hand, the limiting device is also easily affected by the shoes to be cleaned inside the inner cylinder, which may cause it to move, thus affecting the stability of the relative circumferential position between the column and the impeller. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a shoe washing machine with a column on the impeller, wherein the connection between the column and the impeller is convenient and the connection between the column and the impeller is stable.

[0006] To solve the aforementioned technical problem, the present invention provides the following technical solution: a shoe washing machine with a column on the impeller, comprising an impeller located at the bottom of the inner cylinder, a column connected to the axis of the impeller, and a plurality of stirring ribs arranged radially on the end face of the impeller facing the column. The invention is characterized in that... A mounting cavity is provided at the axis position of the impeller, and the lower end of the column is inserted into the mounting cavity. It also includes: A connecting device is provided between the lower end of the column and the mounting cavity, including a connecting structure provided on the lower end side of the column, and a snap-fit ​​structure for engaging with the connecting structure at the location of the mounting cavity. A limiting structure is movably disposed at the position of the mounting cavity to limit the circumferential rotation of the column relative to the impeller; the limiting structure switches between preventing the connecting structure from disengaging from the snap-fit ​​structure and releasing the prevention by moving in the axial direction of the mounting cavity.

[0007] The connecting and snap-fit ​​structures are generally convex and concave structures, or they can be two specific solid blocks. The convex and concave structures are simply respectively set on the column and the mounting cavity, and their positions can be interchanged. When the column is assembled onto the impeller, the limiting component is in the released blocking state; after assembly, the limiting component is in the blocking state.

[0008] Furthermore, the snap-fit ​​structure is a limiting port provided on the wall of the mounting cavity, and the connecting structure is a snap-fit ​​body protruding from the outer circumferential surface of the column. The limiting port is used to accommodate the snap-fit ​​body. The limiting port has an insertion part and a snap-fit ​​part. The snap-fit ​​part has a certain dimension in the circumferential direction of the mounting cavity, and the insertion part has a certain dimension in the axial direction of the mounting cavity. The snap-fit ​​part and the insertion part communicate with each other. The insertion part is generally arranged along the axial direction of the mounting cavity, and the snap-fit ​​part is generally arranged along the circumferential direction of the mounting cavity, but it is not excluded that they are inclined on the wall of the mounting cavity. Through the setting of the insertion part and the snap-fit ​​part, it can be well adapted to the assembly between the column and the mounting cavity. After the column is inserted into the mounting cavity, the snap-fit ​​is achieved by rotation.

[0009] Furthermore, the limiting structure includes a limiting block with an installation port on the outside of the mounting cavity, which communicates with a limiting port. The limiting block is elastically disposed within the installation port. The elasticity of the limiting block is typically provided by a spring, but can also be achieved using an elastic material. The combination of the claw and the locking mechanism ensures good positional stability of the limiting block on the impeller, facilitating the switching between the limiting component's blocking and releasing states.

[0010] Furthermore, the limiting block has a button protruding upwards, slightly protruding to the upper side of the upper opening of the mounting cavity. A pressure plate protrudes from the outer circumferential surface of the lower end of the column, and the button extends into the radial range of the mounting cavity. A notch for engaging with the button is provided at the outer edge of the pressure plate. The button, as part of the limiting block, is typically formed by a design change in size. The engagement of the button and the notch achieves circumferential control of the column's rotation on the impeller. The structure is simple, facilitates operation of the limiting structure, and provides good circumferential stability of the column on the impeller.

[0011] Furthermore, the outer wall of the mounting opening extends to the upper side of the upper opening of the mounting cavity. The top heights of this outer wall and the button correspond, and the outer wall partially encloses the outer side of the button. The upper surface of the pressure plate corresponds to the top position of the outer wall. By partially enclosing the button with the outer wall, and with the height of the outer wall essentially matching the top height of the button, the button is effectively protected from being pressed during shoe washing, thus preventing the column from being deprived of its circumferential rotation on the impeller, resulting in good working stability of the column on the impeller.

[0012] Furthermore, a shoulder is formed on the lower end side of the mounting cavity, and the limiting port is set downward from the shoulder; a limiting body is provided protruding on the outer circumferential surface of the lower end side of the column, the lower end of the limiting body is used to abut against the shoulder, and the limiting body is offset from the limiting structure; the locking body is set on the lower side of the limiting body, and the interval between the locking body and the lower end of the limiting body corresponds to the interval between the locking part and the shoulder. The limiting body can be an annular body or an annular piece set in the radial direction of the column. The limiting body is offset from the limiting structure, so that the column can be rotated and locked in the mounting cavity. With the limiting body, when the column is installed, the limiting body abuts against the shoulder in the mounting cavity, thereby realizing the axial positioning of the column and the mounting cavity. Then, simply rotating the column can realize the column being installed in place on the impeller, which facilitates the installation of the column.

[0013] Furthermore, the dimension of the card body protruding beyond the outer circumference of the column is larger than the gap between the outer circumference of the column and the shoulder. A limiting member protrudes from the limiting block and extends into the limiting opening, reaching the position of the locking portion. During column assembly, the card body slides from the insertion portion into the locking portion by pressing the button with a pressure plate. The limiting member allows for side-positioning of the card body, further ensuring the circumferential stability of the column on the impeller. Moreover, the limiting member, in cooperation with the limiting opening, provides good guidance, contributing to the stability of the limiting block during movement.

[0014] Furthermore, an opening is formed at the top of the stirring rib, and a cover plate is detachably connected to the opening. The inner end of the cover plate extends into the mounting cavity, and the cover plate mainly forms the top surface of the stirring rib. Different bristles can be embedded in the cover plate, allowing for replacement of the cover plate with different bristles as needed to meet the cleaning requirements of shoes made of different fabrics. Because the cover plate is positioned at the top of the stirring rib, the force exerted on the cover plate when the impeller rotates is relatively small, thus contributing to the stability of the cover plate's position on the stirring rib. Additionally, the inner end of the cover plate extending into the mounting cavity can be pressed against the support column by a corresponding structure, further ensuring the positional stability of the cover plate on the stirring rib.

[0015] Furthermore, a support plate corresponding to the opening area is provided on the inner side of the opening. The support plate is integrally connected to the opposite side walls of the opening, and a latch is provided on the opposite side walls of the support plate. A locking device is provided on the back of the cover plate for engaging with the latch. The support plate enables the opposite side walls of the stirring ribs to be connected as a whole, resulting in high strength of the stirring ribs themselves. Moreover, the support plate can effectively support the cover plate, so that the cover plate does not need to be made too thick.

[0016] Furthermore, a support frame is provided at the top of the column. The support frame includes a connecting cover located in the middle and several extending rods arranged radially on the outer periphery of the connecting cover. The connecting cover is fitted and fixed at the top of the column. The support frame is used to provide upright support for the shoes inside the inner tube. This allows the shoes inside the inner tube to be in an upright position, and the surface of the shoes can be fully brushed by the bristles, thereby effectively ensuring the cleaning effect of the shoes.

[0017] Compared with existing technologies, the present invention has the following advantages: In this shoe washing machine, the limiting structure is located at the mounting cavity, which effectively improves the compactness of the structure. The limiting structure prevents or releases resistance by moving along the axial direction of the mounting cavity, which is well adapted to the working mode of the shoe washing machine, and the engagement between the connecting structure and the snap-fit ​​structure is not easy to disengage. Furthermore, by setting the relative position between the top of the limiting structure and the upper opening of the mounting cavity, the shoes inside the inner cylinder are less likely to affect the limiting structure during the operation of the shoe washing machine, thus ensuring the stability of the column during the operation of the shoe washing machine. Attached Figure Description

[0018] Figure 1 This is a 3D view of the cleaning components assembled in this shoe washing machine.

[0019] Figure 2 This is an exploded view of the cleaning components in this shoe washing machine in one direction.

[0020] Figure 3 This is an exploded view of the cleaning components in this shoe washing machine from another direction.

[0021] Figure 4 This is a top view of the impeller and column assembled together.

[0022] Figure 5 yes Figure 4 The enlarged longitudinal sectional view shows the column cut off.

[0023] Figure 6 This is a 3D diagram of a pulsator.

[0024] In the diagram, 1. Column; 2. Pressure plate; 21. Notch; 3. Limiting port; 4. Impeller; 41. Stirring rib; 42. Cover plate; 43. Support plate; 44. Bayonet; 5. Limiting block; 51. Button; 52. Limiting component; 53. Claw; 6. Mounting cavity; 61. Shoulder; 7. Mounting port; 71. Outer wall; 72. Bayonet; 8. Guide column; 9. Limiting piece; 10. Locking body; 11. Compression spring; 12. Support frame; 121. Connecting cover; 122. Extending rod. Detailed Implementation

[0025] Referring to the accompanying drawings, the structure of this shoe washing machine includes an inner cylinder with a circular impeller 4 at its bottom. A column 1 is connected to the center of the impeller 4, and the column 1 is vertically mounted on the impeller. A connecting device is provided between the column 1 and the impeller 4. The connecting device includes a mounting cavity 6 located at the axis of the impeller 4 and a connecting structure located on the lower end of the column 1. When connecting, the lower end of the column 1 is inserted into the mounting cavity 6. A snap-fit ​​structure is provided at the mounting cavity 6 for engaging with the connecting structure. The connecting structure is generally a snap-fit ​​body 10 protruding from the outer circumference of the column 1, and the snap-fit ​​structure is generally a recessed groove on the wall of the mounting cavity 6. A limiting structure is movably provided at the mounting cavity 6 to prevent the connecting structure from detaching from the snap-fit ​​structure. The limiting structure switches between two states: preventing and releasing the connection by moving along the axial direction of the mounting cavity 6. The limiting structure can be manually pressed or pressed by a corresponding structure on the column 1 to release the limiting component 52. The state of the limiting structure being released only occurs when the column 1 and the impeller 4 are assembled; after assembly, the limiting structure is in a state of preventing the connecting structure from disengaging from the locking structure.

[0026] The snap-fit ​​structure is a limiting port 3 located on the wall of the mounting cavity 6. The connecting structure is a snap-fit ​​body 10 protruding from the outer circumference of the column 1. The snap-fit ​​body 10 is relatively small, and the lateral dimension of the limiting port 3 is slightly larger than that of the snap-fit ​​body 10, allowing the limiting port 3 to accommodate the snap-fit ​​body 10. The limiting port 3 is curved and has an insertion part and a snap-fit ​​part, which communicate with each other. The snap-fit ​​part has a certain dimension in the circumferential direction of the mounting cavity 6, and the insertion part has a certain dimension in the axial direction of the mounting cavity 6. These dimensions can be set according to actual assembly needs. As shown in the figure, the insertion part is located along the axial direction of the mounting cavity 6, and the snap-fit ​​part is located in the circumferential direction of the wall of the mounting cavity 6. Figure 1 , 5 As shown, there are four limiting ports 3, which are arranged in a cross shape within the mounting cavity 6. Correspondingly, Figure 2 The image shows four card bodies 10 on the column 1, each inserted into a limiting port 3. A single limiting structure is typically used, positioned at one limiting port 3. For more complex configurations, four limiting structures can be used, each corresponding to one limiting port 3.

[0027] Figure 2 , 3 The limiting structure includes a block-shaped limiting block 5. An installation opening 7 is provided on the outside of the mounting cavity 6, communicating with one of the limiting openings 3. The limiting block 5 is elastically disposed within the mounting opening 7. A limiting member 52 protrudes from one end of the limiting block 5 facing the limiting opening 3, extending into the limiting opening 3. The limiting member 52 is positioned at the intersection of the engaging portion and the insertion portion, acting to abut against the card body 10 at this intersection, preventing the card body 10 from sliding from the engaging portion into the insertion portion under normal conditions. The limiting block 5 has two downwardly extending claws 53, and two corresponding latches 72 are provided on the bottom wall of the mounting opening 7, with the claws 53 movably inserted into the latches 72. A guide post 8 is provided within the mounting opening 7, integrally formed vertically on the bottom wall of the mounting opening 7. A through guide opening is provided inside the limiting block 5, and the guide post 8 is intermittently inserted into the guide opening. A compression spring 11 is provided between the limiting block 5 and the bottom wall of the mounting port 7. When assembling the limiting structure, the limiting block 5 is pressed into the mounting port 7, the claw 53 is engaged in the slot 72, and the compression spring 11 is under pressure.

[0028] A button 51 protrudes upward from the limiting block 5. The button 51 is integrally formed with the limiting block 5. The top of the button 51 slightly protrudes to the upper side of the upper opening of the mounting cavity 6, and the gap between the top of the button 51 and the upper opening of the mounting cavity 6 is generally only a few millimeters. The outer wall 71 of the mounting opening 7 extends to the upper side of the upper opening of the mounting cavity 6, and the outer wall 71 partially wraps around the outside of the button 51. After the column 1 is assembled, the top heights of the outer wall 71 and the button 51 correspond to each other. This correspondence mainly means that they are flush or have a height difference of millimeters. The outer wall 71 can limit the contact of the shoe inside the inner tube with the button 51, so that the limiting member 52 is stably positioned at the intersection of the insertion part and the snap-fit ​​part.

[0029] A pressure plate 2 is provided protruding on the outer circumferential surface of the lower end side of the column 1. The outer diameter of the pressure plate 2 corresponds to the outer diameter of the mounting cavity 6, and the outer diameters of the two are basically equal. Figure 1 , 2 As shown, four stirring ribs 41 are prominently displayed on the front of the impeller 4. The top of the stirring ribs 41 is mainly formed by a removable cover plate 42. The inner end of the cover plate 42 extends into the mounting cavity 6. After the column 1 is installed in place, the pressure plate 2 presses against the top of the inner end of the cover plate 42, thus ensuring the positional stability of the cover plate 42 on the impeller 4. An opening is formed at the top of the stirring rib 41, the length of which is slightly less than the length of the stirring rib 41. The opening is covered by the cover plate 42, the shape of which is adapted to the orientation of the top of the opening. A support plate 43 is provided inside the opening. The opposite sides of the support plate 43 are integrated with the opposite side walls of the opening. The area of ​​the support plate 43 corresponds to the area of ​​the opening. The support plate 43 has several through holes, which are strip-shaped. The tray 43 has Z-shaped locking holes 44 on its opposite side walls; the cover plate 42 has corresponding locking elements on its opposite side edges, one locking element being used to engage with one locking hole 44.

[0030] A shoulder 61 is formed on the lower end side of the mounting cavity 6. After assembly, the lower end of the column 1 extends beyond the shoulder 61. The limiting port 3 is provided downward from the shoulder 61, and a limiting body is provided protruding on the outer circumferential surface of the lower end side of the column 1. The lower end of the limiting body is used to abut against the shoulder 61. However, the limiting body needs to be offset from the limiting structure to prevent the limiting structure from hindering the rotation of the column 1 during assembly. In the axial direction of the column 1, a locking body 10 is provided below the limiting body. The gap between the locking body 10 and the lower end of the limiting body corresponds to the gap between the locking part and the shoulder 61.

[0031] When assembling the column 1, the lower end of the column 1 is inserted into the shoulder 61. The locking body 10 is initially against the shoulder 61. Using the shoulder 61 as support, the column 1 is rotated at a certain angle, causing the locking body 10 to slide into the insertion part. After the lower end of the column 1 is inserted into place, the lower end of the limiting body abuts against the shoulder 61. The locking body 10 moves to the bottom position of the insertion part and is in the locking position. At this time, the lower end of the limiting body abuts against the shoulder 61. Again, using the shoulder 61 as support, the column 1 is rotated in a rotatable direction, and the locking body 10 will lock into the locking part, thereby achieving axial fixation of the column 1 in the mounting cavity 6. The button 51 extends into the radial range of the mounting cavity 6 in the lateral direction. A notch 21 for engaging with the inner side of the button 51 is provided at the outer edge of the pressure plate 2. As shown in the figure, the inner side of the button 51 is a convex arc surface, and the notch 21 is C-shaped. After the lower end of the column 1 is inserted into the shoulder 61, the pressure plate 2 on the column 1 presses down on the button 51. Simultaneously, the limiting member 52 on the limiting block 5 moves downward, creating space for the card body 10 to move to the bottom of the insertion part. After rotating the column 1, when the notch 21 moves to the position of the button 51, the button 51 springs into the notch 21 under the force of the compression spring 11, thus limiting the circumferential rotation of the column 1 and achieving circumferential fixation of the column 1 on the impeller 4. Based on this, the button 51 and the limiting member 52 have essentially the same function in limiting the circumferential rotation of the column 1 on the impeller 4, jointly preventing the relative circumferential rotation of the column 1 on the impeller 4, ensuring a consistent stopping effect. After the column 1 is assembled, the top of the button 51 is generally flush with the upper surface of the pressure plate 2. To facilitate the smooth passage of the card body 10 through the limiting member 52, the end of the limiting member 52 facing the insertion part is beveled. When it is necessary to remove the column 1, press the button 51 by hand so that the top of the button 51 is under the pressure plate 2. After rotating the column 1 in the opposite direction, pull the column 1 upward to remove it, thus achieving the disassembly of the column 1 and the impeller 4.

[0032] Figure 3 As shown, the limiting body consists of several limiting pieces 9, which are arranged along the axial direction of the column 1 and spaced apart around the circumference of the column 1. The limiting pieces 9 are integrally connected to the column 1 and the pressure plate 2. The outer edge of the limiting piece 9 can approach the inner wall of the mounting cavity 6, while the limiting element 52 on the limiting block 5 is set at the interval between two adjacent limiting pieces 9. This interval should be sufficient to ensure that the limiting piece 9 does not touch the limiting element 52 when the column 1 is rotated.

[0033] Figure 1 , 2The image shows a support frame 12 at the top of the column 1. The support frame 12 includes a connecting cover 121 located at the center, which is fitted onto the top of the column 1. Three extension rods 122 are integrally formed on the outer circumference of the connecting cover 121, arranged radially. After the shoe is placed inside the inner tube, it stands upright, with its lower end resting against the impeller 4 and its upper end fitting within the gap between adjacent extension rods 122. Alternatively, the heel of the shoe can be fitted onto the end of the extension rod 122. The extension rod 122 has a U-shaped cross-section, with reinforcing plates between its opposite side walls. The ends of the reinforcing plates are integrally connected to the opposite side walls of the extension rod 122.

Claims

1. A shoe washing machine with a column on a pulsator, comprising a pulsator disposed at the bottom end of an inner cylinder, a column connected to the axis of the pulsator, and a plurality of stirring ribs provided on the end face of the pulsator facing the column, the stirring ribs being arranged radially on the pulsator, characterized in that, A mounting cavity is provided at the axis position of the impeller, and the lower end of the column is inserted into the mounting cavity. It also includes: A connecting device is provided between the lower end of the column and the mounting cavity, including a connecting structure provided on the lower end side of the column, and a snap-fit ​​structure for engaging with the connecting structure at the location of the mounting cavity. A limiting structure is movably disposed at the position of the mounting cavity to limit the circumferential rotation of the column relative to the impeller; the limiting structure switches between preventing the connecting structure from disengaging from the snap-fit ​​structure and releasing the prevention by moving in the axial direction of the mounting cavity.

2. The shoe washing machine according to claim 1, characterized in that, The aforementioned snap-fit ​​structure is a limiting port set on the wall of the mounting cavity, and the aforementioned connection structure is a snap-fit ​​body protruding from the outer circumferential surface of the column. The limiting port is used to accommodate the snap-fit ​​body. The limiting port has an insertion part and a snap-fit ​​part. The snap-fit ​​part has a certain dimension in the circumferential direction of the mounting cavity, and the insertion part has a certain dimension in the axial direction of the mounting cavity. The snap-fit ​​part and the insertion part are connected.

3. The shoe washing machine according to claim 2, characterized in that, The limiting structure includes a limiting block, and an installation port is provided on the outside of the mounting cavity. The installation port communicates with a limiting port, and the limiting block is elastically disposed in the installation port.

4. The shoe washing machine according to claim 3, characterized in that, The limiting block has a button protruding upwards, which slightly protrudes to the upper side of the upper opening of the mounting cavity. A pressure plate protrudes from the outer circumferential surface of the lower end of the column. The button extends into the radial range of the mounting cavity. A notch for engaging with the button is provided at the outer edge of the pressure plate.

5. The shoe washing machine according to claim 4, characterized in that, The outer wall of the mounting port extends to the upper side of the upper opening of the mounting cavity. The top heights of the outer wall and the button correspond to each other. The outer wall partially wraps around the outside of the button, and the upper surface of the pressure plate corresponds to the top position of the outer wall.

6. The shoe washing machine according to claim 4, characterized in that, A shoulder is formed on the lower end side of the mounting cavity, and the limiting port is set downward from the shoulder; a limiting body is provided on the outer peripheral surface of the lower end side of the column, the lower end of the limiting body is used to abut against the shoulder, and the limiting body is offset from the limiting structure; the locking body is set on the lower side of the limiting body, and the interval between the locking body and the lower end of the limiting body corresponds to the interval between the locking part and the shoulder.

7. The shoe washing machine according to claim 6, characterized in that, The size of the card body protruding from the outer periphery of the column is larger than the gap between the outer periphery of the column and the shoulder. A limiting member is provided on the limiting block that extends into the limiting opening. The limiting member extends into the position of the locking part. When assembling the column, the card body slides from the insertion part into the position of the locking part by pressing the button with the pressure plate.

8. The shoe washing machine according to any one of claims 1 to 7, characterized in that, The top of the stirring rib has an opening, and a cover plate is detachably connected to the opening. The inner end of the cover plate extends into the mounting cavity, and the cover plate mainly forms the top surface of the stirring rib.

9. The shoe washing machine according to claim 8, characterized in that, A support plate corresponding to the opening area is provided on the inner side of the opening. The support plate is integrated with the opposite side walls of the opening. A latch is provided on the opposite side walls of the support plate. A clip is provided on the back of the cover plate for engaging with the latch.

10. The shoe washing machine according to any one of claims 1 to 7, characterized in that, A support frame is provided at the top of the column. The support frame includes a connecting cover located in the middle and several protruding rods arranged radially on the outer periphery of the connecting cover. The connecting cover is fitted and fixed at the top of the column. The support frame is used to provide vertical support for the shoes inside the inner tube.

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