CN110685332B

CN110685332B - Toilet wash basin cleaning device

Info

Publication number: CN110685332B
Application number: CN201911043960.5A
Authority: CN
Inventors: 陈萧歌
Original assignee: Foshan Shunde Jiegao Daily Necessities Co Ltd
Current assignee: Foshan Shunde Jiegao daily necessities Co., Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-12-18
Anticipated expiration: 2039-10-30
Also published as: JP2021069920A; CN110685332A; JP6807515B1

Abstract

The invention discloses a toilet wash basin cleaning device, which comprises a wash basin, wherein a wash basin with an upward opening is fixed in the wash basin, a work box is arranged on the upper side of the wash basin, two support blocks for supporting the work box are fixed at the lower end of the work box, an annular cavity with the lower end wall communicated with the external space is arranged in the work box, a rotatable annular block is arranged in the annular cavity, two moving cavities with upward openings and the lower end wall communicated with the annular cavity are arranged in the annular block, a washing mechanism with the lower end positioned in the external space and capable of cleaning the inner wall of the wash basin is arranged in the moving cavity, the device has a simple structure and convenient operation, can automatically clean the wash basin, does not need manual operation for cleaning, improves the working efficiency of wash basin cleaning, and can clean stains in the wash basin vigorously through mechanical cleaning, saving the strength of people.

Description

Toilet wash basin cleaning device

Technical Field

The invention relates to the field of kitchens and bathrooms, in particular to a cleaning device for a toilet basin.

Background

The washbasin is an indispensable work in each toilet, and when the washbasin is used every time, part of stains are left on the wall of the washbasin, so that the stains are accumulated for a long time, and the use of the washbasin is influenced;

at present, when cleaning the washstand, rely on artifical manual clean mostly, inefficiency and consuming time power, in order to clean stubborn spot in the washstand, mostly need the cleanup crew to exert energetically just can better clean the washstand to the messenger consumes a large amount of strength cleanness, is particularly not favorable to cleaning a large amount of washstands in the mansion.

Disclosure of Invention

The invention aims to solve the technical problem of providing a cleaning device for a washroom wash basin, which solves the problems of low cleaning efficiency and the like, thereby improving the cleaning efficiency.

The invention is realized by the following technical scheme.

The invention discloses a toilet wash basin cleaning device, which comprises a wash basin, wherein a wash basin with an upward opening is fixed in the wash basin, a work box is arranged on the upper side of the wash basin, two supporting blocks for supporting the work box are fixed at the lower end of the work box, an annular cavity with the lower end wall communicated with the external space is arranged in the work box, a rotatable annular block is arranged in the annular cavity, two moving cavities with upward openings and the lower end wall communicated with the annular cavity are arranged in the annular block, and a washing mechanism with the lower end positioned in the external space and capable of cleaning the inner wall of the wash basin is arranged in the moving cavity;

a moving mechanism capable of driving the washing mechanism to move left and right is arranged in the moving cavity, the moving mechanism comprises an electric guide rail arranged on the rear end wall of the moving cavity, a moving block capable of being driven by the electric guide rail to move is fixed at the front end of the electric guide rail, a rotating cavity with an upward opening is arranged in the moving block, a rotating shaft is rotatably connected between the left end wall and the right end wall of the rotating cavity, a rotating gear and a rope winding wheel are fixedly connected on the rotating shaft, the rotating shaft is fixedly connected with the end wall of the rotating cavity through a torsion spring, a spring cavity with a lower end wall communicated with the annular cavity is arranged in the upper end wall of the annular cavity, a spring block and a telescopic spring connected with the rear end of the spring block and the rear end wall of the spring cavity are slidably connected in the spring cavity, a string is fixedly connected at the front end of the spring block, and a rack block with the, a pull rope is wound on the rope winding wheel, a water spraying mechanism capable of spraying water into the washbasin is further arranged in the working box, and a driving mechanism capable of driving the annular block to rotate and outputting power for the device to operate is arranged in the working box;

when the washbasin is cleaned, the work box is placed on the washbasin, the driving mechanism works to output power so as to control the annular block to rotate, then the moving mechanism works to control the washing mechanism to move, the water spraying mechanism works to spray water into the washbasin, and meanwhile the washing mechanism cleans the inner wall of the washbasin along with the rotation of the annular block.

Furthermore, the washing mechanism comprises a moving rod which is fixed at the lower end of the moving block and the lower end of which is positioned in the external space, a lifting cavity with a downward opening is arranged in the movable rod, a lifting rod with the lower end positioned in the external space and a lifting spring for connecting the upper end wall of the lifting cavity and the upper end of the lifting rod are arranged in the lifting cavity, a connecting plate is arranged at the lower side of the lifting rod, sponge is fixed at the lower end of the connecting plate, two rotating plates are fixed on the upper end surface of the connecting plate, a rotating shaft penetrating through the lower end of the lifting rod is fixedly connected between the two rotating plates, the lower end of the pull rope penetrates through the lower end wall of the rotating cavity and the upper end wall of the lifting cavity and is fixedly connected with the lifting rod, and a rope with the upper end penetrating through the upper end wall of the lifting cavity and the moving block and fixedly connected with the end wall of the moving cavity close to the water spraying mechanism is further fixed at the upper end of the lifting rod.

Further, the water spraying mechanism comprises a piston cavity, a piston and two lifting springs for supporting the piston are arranged in the piston cavity, a lower end wall is arranged in the piston and is communicated with a ring groove of the piston cavity, a ring disc is connected in the ring groove in a sliding manner, a chain with a lower end positioned in the piston cavity is fixed at the lower end of the ring disc, a water receiving hose with an upper end positioned in an external space and communicated with the external space and the piston cavity is arranged on the upper end wall of the piston cavity, a lifting rod with an upper end penetrating through the piston and a lower end positioned in the external space is arranged in the piston cavity, a rotating rod is fixed at the lower end of the lifting rod, a water pipeline with an upper end communicated with the upper side of the piston is arranged in the piston cavity and a lower end positioned in the rotating rod is arranged in the lifting rod, and the left end, go back two lower extremes of fixedly connected with and be located the driving plate in the external space on the lifter, two lower extreme of terminal surface fixedly connected with are located the transfer line in the external space under the annular piece, two through backup pad fixed connection between the transfer line lower extreme, the driving plate lower extreme with the lifter lower extreme all runs through the backup pad, the backup pad up end still is fixed with and promotes driving plate pivoted stopper.

Further, the driving mechanism comprises driving cavities respectively positioned in the left end wall and the right end wall of the annular cavity, the lower end wall of the driving cavity is rotationally connected with a driving shaft, the upper end wall of the driving cavity on the right side is fixedly provided with a driving motor which is in power connection with the upper end of the driving shaft, a rope winding wheel is fixed at the upper end of the driving shaft, the lower end of the chain penetrates through the lower end wall of the piston cavity and the right end wall of the driving cavity at the right side and is wound on the rope winding wheel, the lower end of the driving shaft is also fixedly connected with a driving wheel, one end of the driving wheel is positioned in the annular cavity and is meshed and connected with the annular block, a sliding cavity communicated with the driving cavity is arranged in the end wall at one side of the driving cavity, a sliding block with one end in frictional connection with the driving wheel is connected in the sliding cavity in a sliding way, the front end of the string penetrates through the front end wall of the spring cavity, the front end wall of the sliding cavity and the sliding block to be fixedly connected.

Further, in an initial state, the torsion spring is in a twisted state, the lifting spring is in a compressed state, the telescopic spring is in a stretched state, the rope is in a loose state, and the rest springs are in a normal stretched state.

Further, the friction force between the driving wheel and the sliding block is far greater than the sum of the elastic force of the lifting spring, the elastic force of the torsion spring and the elastic force of the extension spring.

The invention has the beneficial effects that: the device simple structure, the simple operation, the device can accomplish the cleanness to the lavatory basin automatically, does not need people's manual operation clearance, has improved the clear work efficiency of lavatory basin, and through the mechanical mode cleanness, just can energetically clean the spot in the lavatory basin, saves people's strength.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a left-view enlarged structural schematic diagram of the slider in FIG. 1;

FIG. 3 is a left enlarged structural view of the spring block of FIG. 1;

FIG. 4 is a left enlarged structural view of the embodiment of the present invention in FIG. 1, wherein the structure of the lifting rod is fully sectioned;

FIG. 5 is an enlarged schematic view of the structure at A in FIG. 1 according to an embodiment of the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 1 according to an embodiment of the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1-6, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The toilet washbasin cleaning device described in conjunction with fig. 1-6 comprises a wash basin 10, a washbasin 11 with an upward opening is fixed in the wash basin 10, a work box 24 is arranged on the upper side of the wash basin 10, two support blocks 14 for supporting the work box 24 are fixed at the lower end of the work box 24, an annular cavity 25 with a lower end wall communicated with an external space is arranged in the work box 24, a rotatable annular block 27 is arranged in the annular cavity 25, two moving cavities 22 with upward openings and lower end walls communicated with the annular cavity 25 are arranged in the annular block 27, a washing mechanism 73 with a lower end positioned in the external space and capable of cleaning the inner wall of the washbasin 11 is arranged in the moving cavity 22, a moving mechanism 71 capable of driving the washing mechanism 73 to move left and right is arranged in the moving cavity 22, the moving mechanism 71 comprises an electric guide rail 21 arranged on the rear end wall of the moving cavity 22, a moving block 63 which can be driven by the electric guide rail 21 to move is fixed at the front end of the electric guide rail 21, a rotating cavity 58 with an upward opening is arranged in the moving block 63, a rotating shaft 61 is rotatably connected between the left end wall and the right end wall of the rotating cavity 58, a rotating gear 60 and a rope winding wheel 56 are fixedly connected to the rotating shaft 61, the rotating shaft 61 is fixedly connected to the end wall of the rotating cavity 58 through a torsion spring 57, a spring cavity 48 with a lower end wall communicated with the annular cavity 25 is arranged in the upper end wall of the annular cavity 25, a spring block 46 and an expansion spring 45 which connects the rear end of the spring block 46 and the rear end wall of the spring cavity 48 are slidably connected to the spring cavity 48, a thin rope 47 is fixedly connected to the front end of the spring block 46, a rack block 49 with a lower end positioned in the annular cavity 25 and engaged with the rotating gear 60 is fixed to the lower end of the spring, a water spraying mechanism 72 capable of spraying water into the washbasin 11 is further arranged in the work box 24, a driving mechanism 70 capable of driving the annular block 27 to rotate and outputting power for device operation is arranged in the work box 24, during cleaning, the work box 24 is placed on the wash basin 10, the driving mechanism 70 outputs power during work, so that the annular block 27 is controlled to rotate, then the moving mechanism 71 controls the washing mechanism 73 to move during work, when the water spraying mechanism 72 sprays water into the washbasin 11, the washing mechanism 73 cleans the inner wall of the washbasin 11 along with the rotation of the annular block 27.

Beneficially, the washing mechanism 73 includes a moving rod 19 fixed at the lower end of the moving block 63 and having a lower end located in the external space, a lifting cavity 18 with a downward opening is arranged in the moving rod 19, a lifting rod 17 with a lower end located in the external space and a lifting spring 20 connecting the upper end wall of the lifting cavity 18 and the upper end of the lifting rod 17 are arranged in the lifting cavity 18, a connecting plate 13 is arranged at the lower side of the lifting rod 17, a sponge 12 is fixed at the lower end of the connecting plate 13, two rotating plates 15 are fixed on the upper end face of the connecting plate 13, a rotating shaft 16 penetrating through the lower end of the lifting rod 17 is fixedly connected between the two rotating plates 15, the lower end of the pull rope 59 penetrates through the lower end wall of the rotating cavity 58 and the upper end wall of the lifting cavity 18 and is fixedly connected with the lifting rod 17, and an upper end of the lifting rod 17 is further fixed with an end wall, having an upper end penetrating through the upper end wall of the lifting cavity 18 and the A cord 23.

Beneficially, water spray mechanism 72 includes piston chamber 64, be equipped with piston 69 and two supports in the piston chamber 64 lift spring 65 of piston 69, be equipped with lower end wall intercommunication in the piston 69 the ring channel 67 of piston chamber 64, sliding connection has annular disc 68 in the ring channel 67, annular disc 68 lower extreme is fixed with the lower extreme and is located the chain 33 in the piston chamber 64, piston chamber 64 upper end wall is equipped with the upper end and is located external space and communicate external space with the water receiving hose 26 of piston chamber 64, be equipped with the upper end in the piston chamber 64 and run through the lifter 39 of piston 69 and lower extreme in external space, lifter 39 lower extreme is fixed with dwang 40, be equipped with the upper end intercommunication in the lifter 39 the piston 69 upside piston chamber 64 and lower extreme are located the water pipeline 51 in the dwang 40, the end wall runs through both ends and communicate external space around the dwang 40 respectively about the lower extreme of water pipeline 51, go back two lower extremes of fixedly connected with and be located the driving plate 50 of external space on the lifter 39, two lower extreme of end face fixedly connected with are located the transfer line 42 of external space under the annular piece 27, two pass through backup pad 41 fixed connection between the transfer line 42 lower extreme, driving plate 50 lower extreme with lifter 39 lower extreme all runs through backup pad 41, backup pad 41 up end still is fixed with and can promotes driving plate 50 pivoted stopper 38.

Advantageously, the drive mechanism 70 includes drive chambers 36 located in the left and right end walls of the annular chamber 25, the lower end wall of the driving cavity 36 is rotatably connected with a driving shaft 37, the upper end wall of the driving cavity 36 at the right side is fixed with a driving motor 28 which is in power connection with the upper end of the driving shaft 37, a rope winding wheel 32 is fixed at the upper end of the driving shaft 37, the lower end of the chain 33 penetrates through the lower end wall of the piston cavity 64 and the right end wall of the driving cavity 36 at the right side and is wound on the rope winding wheel 32, the lower end of the driving shaft 37 is also fixedly connected with a driving wheel 34 which is positioned at one end of the annular cavity 25 and is meshed and connected with the annular block 27, a sliding cavity 44 communicated with the driving cavity 36 is arranged in one side end wall of the driving cavity 36, a sliding block 35 with one end frictionally connected with the driving wheel 34 is slidably connected in the sliding cavity 44, the front end of the string 47 penetrates through the front end wall of the spring cavity 48 and the front end wall of the sliding cavity 44 and is fixedly connected with the sliding block 35.

Advantageously, in the initial state, the torsion spring 57 is in a twisted state, the lifting spring 20 is in a compressed state, the expansion spring 45 is in a stretched state, the cord 23 is in a relaxed state, and the remaining springs are in a normal stretched state.

Advantageously, the friction between the driving wheel 34 and the sliding block 35 is much greater than the sum of the elastic force of the lifting spring 20, the elastic force of the torsion spring 57 and the elastic force of the extension spring 45.

Sequence of mechanical actions of the whole device:

1: when cleaning is needed, the work box 24 is placed on the upper side of the hand washing table 10, the water hose 26 is sleeved on the water tap opening on the upper side of the hand washing table 10, at this time, the driving motor 28 works to drive the right driving shaft 37 to rotate, so as to drive the right driving wheel 34 to rotate, so as to drive the ring block 27 to rotate, so as to drive the left driving shaft 37 and the left driving wheel 34 to rotate, the rotation of the driving wheel 34 drives the sliding block 35 to move forward, so as to loosen the thin rope 47, so that the extension spring 45 is reset to drive the spring block 46 to move backward, so as to drive the rack block 49 to move backward, so as to drive the rotating gear 60 to rotate, so as to drive the rotating shaft 61 and the rope winding wheel 56 to rotate, so as to loosen the pulling rope 59, the torsion spring 57 is reset, because the pulling rope 59 is loosened, so as to reset the lifting spring, when the sponge 12 is contacted with the end wall of the washbasin 11, the sponge 12 rotates due to the inclination of the end wall of the washbasin 11, so that the lower end of the sponge 12 is attached to the end wall of the washbasin 11, when the sponge 12 stops descending, the lifting spring 20 is not completely reset, and the rope 23 is just tensioned;

2: the driving rod 42 and the supporting plate 41 are driven to rotate during the rotation of the ring block 27, so that the limiting block 38 is driven to rotate, so that the driving plate 50 is driven to rotate, so that the lifting rod 39 and the rotating rod 40 are driven to rotate, and the rope winding wheel 32 is driven to rotate during the rotation of the right driving shaft 37, so that the chain 33 is wound tightly, so that the piston 69 is driven to descend, the lifting spring 65 is compressed, so that the lifting rod 39 moves downwards, so that the rotating rod 40 descends, so that the water spraying opening of the water pipeline 51 and the position of the sponge 12 are positioned at the same horizontal plane;

3: when a faucet connected with the water receiving hose 26 is opened, water is sprayed out and sprayed on the end wall of the washbasin 11 through the water pipeline 51, at the moment, the sponge 12 and the rotating rod 40 are driven to rotate by the rotation of the annular block 27, so that the end wall of the washbasin 11 is wetted, the sponge 12 starts to wash the end wall of the washbasin 11 and starts to clean, the electric guide rail 21 works to drive the moving block 63 to approach to the water spraying mechanism 72, so that the rope 23 is loosened, the rope 23 can continue to move downwards, the sponge 12 can be in contact with the end wall of the washbasin 11 all the time in the movement process of the moving block 63, and the inner wall of the washbasin 11 can be cleaned completely by the sponge 12;

4: when the sponge 12 is cleaned to the bottom of the washbasin 11, the driving motor 28 is operated to rotate the right driving shaft 37 in reverse, so that the right driving wheel 34 is rotated in reverse, the ring block 27 is rotated in reverse with the left driving wheel 34, the sliding block 35 is reset, the string 47 is pulled, the spring block 46 is reset with the rack block 49, the rotating gear 60 is rotated in reverse, the rotating shaft 61 is rotated in reverse with the rope winding wheel 56, the pulling rope 59 is wound up, the lifting rod 17 is moved upward, so that the sponge 12 is separated from the end wall of the washbasin 11, the lifting spring 20 and the extension spring 45 are recompressed, the torsion spring 57 is recompressed, the rope 23 is released again, and the rope winding wheel 32 is reversed due to the reverse rotation of the right driving shaft 37, so that the chain 33 is released, so that the lifting spring 65 is reset to move the piston 69 upward, thereby drive lifter 39 and dwang 40 upward movement, because the rotation of annular piece 27, make lifter 39 and dwang 40 still at rotatory water spray at the in-process of upward movement to clean the wash-finished wash basin 11 end wall, electronic guide rail 21 also works and drives movable block 63 and move towards the direction of keeping away from water spray mechanism 72, thereby drive washing mechanism 73 and reset, when piston 69 resets, driving motor 28 stop motion, thereby make the device accomplish and reset and accomplish the cleanness to wash basin 11 end wall.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A toilet lavatory basin cleaning device, includes the wash platform, its characterized in that: a wash basin with an upward opening is fixed in the wash basin, a work box is arranged on the upper side of the wash basin, two supporting blocks for supporting the work box are fixed at the lower end of the work box, a ring cavity with a lower end wall communicated with the external space is arranged in the work box, a rotatable ring block is arranged in the ring cavity, two moving cavities with upward openings and lower end walls communicated with the ring cavity are arranged in the ring block, and a washing mechanism with a lower end positioned in the external space and capable of cleaning the inner wall of the wash basin is arranged in the moving cavity; a moving mechanism capable of driving the washing mechanism to move left and right is arranged in the moving cavity, the moving mechanism comprises an electric guide rail arranged on the rear end wall of the moving cavity, a moving block capable of being driven by the electric guide rail to move is fixed at the front end of the electric guide rail, a rotating cavity with an upward opening is arranged in the moving block, a rotating shaft is rotatably connected between the left end wall and the right end wall of the rotating cavity, a rotating gear and a rope winding wheel are fixedly connected on the rotating shaft, the rotating shaft is fixedly connected with the end wall of the rotating cavity through a torsion spring, a spring cavity with a lower end wall communicated with the annular cavity is arranged in the upper end wall of the annular cavity, a spring block and a telescopic spring connected with the rear end of the spring block and the rear end wall of the spring cavity are slidably connected in the spring cavity, a string is fixedly connected at the front end of the spring block, and a rack block with the, a pull rope is wound on the rope winding wheel, a water spraying mechanism capable of spraying water into the washbasin is further arranged in the working box, and a driving mechanism capable of driving the annular block to rotate and outputting power for the device to operate is arranged in the working box; when the washing basin is washed, the work box is placed on the wash basin, the driving mechanism works to output power so as to control the annular block to rotate, then the moving mechanism works to control the washing mechanism to move, the water spraying mechanism works to spray water into the wash basin, and meanwhile, the washing mechanism cleans the inner wall of the wash basin along with the rotation of the annular block; the washing mechanism comprises a moving rod fixed at the lower end of the moving block and the lower end of the moving rod is positioned in the external space, a lifting cavity with a downward opening is arranged in the movable rod, a lifting rod with the lower end positioned in the external space and a lifting spring for connecting the upper end wall of the lifting cavity and the upper end of the lifting rod are arranged in the lifting cavity, a connecting plate is arranged at the lower side of the lifting rod, sponge is fixed at the lower end of the connecting plate, two rotating plates are fixed on the upper end surface of the connecting plate, a rotating shaft penetrating through the lower end of the lifting rod is fixedly connected between the two rotating plates, the lower end of the pull rope penetrates through the lower end wall of the rotating cavity and the upper end wall of the lifting cavity and is fixedly connected with the lifting rod, a rope with the upper end penetrating through the upper end wall of the lifting cavity and the moving block and fixedly connected with the end wall of the moving cavity close to the water spraying mechanism is further fixed at the upper end of the lifting rod; the water spraying mechanism comprises a piston cavity, a piston and two lifting springs for supporting the piston are arranged in the piston cavity, a lower end wall is arranged in the piston and is communicated with a ring groove of the piston cavity, a ring disc is connected in the ring groove in a sliding manner, the lower end of the ring disc is fixed with a chain with the lower end positioned in the piston cavity, a water receiving hose with the upper end positioned in an external space and communicated with the external space and the piston cavity is arranged on the upper end wall of the piston cavity, a lifting rod with the upper end penetrating through the piston and the lower end positioned in the external space is arranged in the piston cavity, a rotating rod is fixed at the lower end of the lifting rod, a water pipeline with the upper end communicated with the upper end of the piston and the lower end positioned in the rotating rod is arranged in the lifting rod, the left end wall and the right end wall of the lower end of the water pipeline respectively penetrate through the front end and the rear, the lower end face of the annular block is fixedly connected with two transmission rods of which the lower ends are positioned in an external space, the lower ends of the two transmission rods are fixedly connected through a supporting plate, the lower ends of the transmission plates and the lower ends of the lifting rods penetrate through the supporting plate, and the upper end face of the supporting plate is also fixedly provided with a limiting block capable of pushing the transmission plates to rotate; the driving mechanism comprises driving cavities respectively positioned in the left end wall and the right end wall of the annular cavity, the lower end wall of the driving cavity is rotatably connected with a driving shaft, the upper end wall of the driving cavity on the right side is fixedly provided with a driving motor in power connection with the upper end of the driving shaft, the upper end of the driving shaft is fixedly provided with a rope winding wheel, the lower end of the chain penetrates through the lower end wall of the piston cavity and the right end wall of the driving cavity on the right side and is wound on the rope winding wheel, the lower end of the driving shaft is also fixedly connected with a driving wheel, one end of the driving wheel is positioned in the annular cavity and is in meshed connection with the annular block, a sliding cavity communicated with the driving cavity is arranged in the end wall of one side of the driving cavity, a sliding block with one end of the sliding cavity in friction connection with the driving; in an initial state, the torsion spring is in a twisted state, the lifting spring is in a compressed state, the telescopic spring is in a stretched state, the rope is in a loose state, and the rest springs are in normal stretched states; the friction force between the driving wheel and the sliding block is far larger than the sum of the elastic force of the lifting spring, the elastic force of the torsion spring and the elastic force of the extension spring.