CN111631646A

CN111631646A - Electric floor-scrubbing machine

Info

Publication number: CN111631646A
Application number: CN201910156078.5A
Authority: CN
Inventors: 陈博
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-01
Filing date: 2019-03-01
Publication date: 2020-09-08

Abstract

The invention relates to a ground cleaning device, in particular to an electric floor wiping machine, wherein a main support is arranged on a fixed plate assembly, both sides of the main support are provided with roller assemblies, and a motor is arranged in the main support; the roller components comprise an inner roller, an outer roller, a main shaft, a supporting component and a transmission component, the supporting component is arranged on the fixed plate component, one end of the main shaft is rotatably arranged on the supporting component, the other end of the main shaft is connected with the transmission component, and the motor is connected with the main shafts in the roller components at two sides through a transmission mechanism arranged in the fixed plate component and drives the main shafts at two sides to synchronously rotate in the reverse direction; the inner roller is rotationally sleeved on the supporting component, the outer roller is sleeved outside the inner roller, the driving part is linked with the main shaft and is driven with the outer roller through the inner roller or directly connected with the outer roller, and the outer roller is externally wrapped with a mop for mopping. The middle of the floor mopping machine does not generate a gap, so that the covering width is close to the width of the floor mopping machine when the floor mopping machine is used for mopping the floor, and the floor mopping efficiency is higher and cleaner due to the front-back contra-rotating arrangement.

Description

Electric floor-scrubbing machine

Technical Field

The invention relates to a floor cleaning device, in particular to an electric floor wiping machine.

Background

A mopping robot navigated by a navigation box is characterized in that a mopping plate with a water storage box is arranged at the front part of the robot, and cleaning cloth is arranged below the mopping plate. When the water storage box starts to work, water in the water storage box continuously permeates into the cleaning cloth to play a role in humidifying. The water in the water storage box is limited and can be used up quickly; meanwhile, the cleaning cloth is also dirtied quickly, so that the cleaning area is limited once, and if the water storage box is cleaned continuously, water needs to be added again manually and the cleaning cloth needs to be replaced; if the cleaning area is large, the operation needs to be repeated for many times, and in addition, more navigation boxes need to be arranged, so that the operation is still complicated in the using process.

A novel utility model 'forward and backward movement type mop' with the publication number CN203195624U on 18.9.2013 realizes the forward and backward reciprocating high-frequency movement of the front and back wiping boards by a cam mechanism, thereby realizing the floor wiping function. However, the "forward and backward movement type mop" still requires manual removal and cleaning of the mop, and the non-constant torque generated when the cam mechanism operates makes the machine generate large vibration noise, and affects the reliability and durability. In addition, some left and right double-wheel counter-rotating electric floor mopping machines are also available in the market, the mop cloth under the wheel discs is driven by the rotation of the left and right wheel discs to realize the floor mopping function, but gaps are inevitably formed between the wheel discs, so that the wiping effect at the gaps is poor, the width equivalent to the width of a machine body cannot be really covered, and if the mopping machine needs to be covered, an operating handle needs to be dragged for many times; in addition, the mop also needs to be manually disassembled and replaced and washed for many times, the two electric floor mopping machines only can play a limited role in reducing the labor intensity, and the operation performance is poor.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide an electric floor cleaning machine.

The purpose of the invention is realized by the following technical scheme:

the invention comprises a roller component, a fixed plate component, a main support, a motor and a transmission mechanism, wherein the main support is arranged on the fixed plate component, the roller component is arranged on each of two sides of the main support, and the motor is arranged in the main support; the motor is connected with the main shafts in the roller assemblies at two sides through a transmission mechanism arranged in the fixed plate assembly and drives the main shafts at two sides to synchronously rotate reversely; the inner roller is rotatably sleeved on the supporting component, the outer roller is sleeved outside the inner roller, the transmission part is linked with the main shaft and is in transmission with the outer roller through the inner roller or in direct transmission with the outer roller, so that the outer rollers on two sides of the main support are driven to rotate reversely, and mops for mopping are wrapped outside the outer rollers;

wherein: the supporting assembly is a bearing seat, the bearing seat is arranged on the fixed plate assembly, and the main shaft is rotatably arranged in the bearing seat; the inner roller is sleeved outside the bearing seat and is rotationally connected with the bearing seat;

the supporting assembly comprises a bearing seat and a supporting piece, the bearing seat is arranged on the fixed plate assembly, and the main shaft penetrates through the bearing seat and is rotationally connected with the bearing seat; the support piece is arranged on the main shaft and is linked with the main shaft; the inner roller is sleeved outside the supporting piece, is supported by the supporting piece and synchronously rotates with the supporting piece;

the main shaft is rotatably connected with the bearing seat through a bearing, a locking piece is sleeved on the main shaft, and the locking piece is in threaded connection with one end, far away from the fixed plate assembly, of the bearing seat to axially limit the bearing;

the supporting component is a fixing plate and a supporting component, the fixing plate is the fixing plate component, the fixing plate is of a hollow structure, and one end of the main shaft is rotatably installed in the fixing plate; the support piece is arranged on the main shaft and is linked with the main shaft; the inner roller is sleeved outside the supporting piece, is supported by the supporting piece and synchronously rotates with the supporting piece;

one end of the inner roller, which is far away from the fixed plate component, is circumferentially and uniformly provided with meshing teeth, and the inner surface of the end, which is close to the end part, is circumferentially and uniformly provided with tooth sockets; the transmission part is positioned inside one end of the inner roller, and outer teeth which are meshed with the tooth sockets for transmission are uniformly distributed on the outer surface of the transmission part along the circumferential direction; an occlusion cylinder is arranged in one end, far away from the fixed plate component, of the outer roller, occlusion teeth are uniformly distributed on the occlusion cylinder along the circumferential direction, and the occlusion teeth on the occlusion cylinder are in meshing transmission with the occlusion teeth on the inner roller;

the transmission part is positioned outside the inner roller and inside the outer roller when in direct connection transmission with the outer roller, and one end of the transmission part, which is far away from the fixed plate component, is uniformly provided with meshing teeth along the circumferential direction; an engagement cylinder is arranged in one end of the outer roller, which is far away from the fixed plate component, engagement teeth are uniformly distributed on the engagement cylinder along the circumferential direction, and the engagement teeth on the engagement cylinder are in engagement transmission with the engagement teeth on the transmission component;

the fixing plate assembly comprises a fixing plate and an outer cover, the outer cover is of a hollow structure, the fixing plate is arranged in the outer cover, the main support and the supporting assembly are both arranged on the fixing plate, and the transmission mechanism is accommodated in the outer cover;

the end part of the other end of the main shaft is connected with a limiting cap of a limiting transmission part, and a spigot is arranged on the limiting cap; the end part of one end of the outer roller, which is far away from the fixed plate component, is provided with a locking component, the locking component comprises a button, a mounting disc, a spring and hook-shaped parts, the mounting disc is fixed on the occlusion cylinder, the button which can move along the axial direction is arranged on the mounting disc, the hook-shaped parts are symmetrically arranged on two sides of the button, the hook-shaped parts are positioned in the outer roller, the hook-shaped parts on each side are hinged to the mounting disc, one end of each hook-shaped part is abutted to the button, the other end of each hook-shaped part is in a hook;

the transmission mechanism is a gear set which comprises two gears larger than two, the output shaft of the motor is connected with a gear, the number of the gears on one side of the gear is one more than that of the gears on the other side of the gear, and therefore synchronous reverse rotation of the main shafts on two sides of the main support is achieved.

The invention has the advantages and positive effects that:

the front side and the rear side of the main support are symmetrically provided with the roller assemblies, the rollers in the two roller assemblies rotate reversely, and no gap is generated between the two roller assemblies relative to a left-right contra-rotating floor-scrubbing machine, so that the coverage width is close to the width of the machine when the floor-scrubbing machine rubs the floor, and the front-rear contra-rotating floor-scrubbing efficiency is higher and cleaner.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of the present invention with the roller assembly removed;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a cross-sectional view of a first embodiment of the present invention;

FIG. 5 is a structural sectional view of a second embodiment of the present invention;

FIG. 6 is a sectional view of the drum assembly of FIG. 5 with the outer drum removed;

FIG. 7 is a structural sectional view of a third embodiment of the present invention;

FIG. 8 is a sectional view of the drum assembly of FIG. 7 with the outer drum removed;

FIG. 9 is a structural sectional view of a fourth embodiment of the present invention;

FIG. 10 is a front view of the inner drum of the present invention;

FIG. 11 is a perspective view of the inner drum of the present invention;

FIG. 12 is a schematic perspective view of a bite block of the present invention;

FIG. 13 is a schematic view of a driving member according to the present invention;

FIG. 14 is a structural cross-sectional view of the locking assembly of the present invention;

FIG. 15 is a schematic view of another construction of the transmission member of the present invention;

wherein: 1 is a roller component, 101 is an inner roller, 102 is an outer roller, 103 is an engagement cylinder, 104 is a main shaft, 105 is a bearing seat, 106 is a bearing A, 107 is a bearing B, 108 is a bearing C, 109 is a locking part, 110 is a transmission part, 111 is a limiting cap, 112 is a supporting part, 113 is an engagement tooth, 114 is a tooth socket, and 115 is an outer tooth;

2, a fixed plate component, 201, an outer cover plate, 202, an inner cover plate, 203 and 204 are respectively a hole and a fixed plate;

3 is a main bracket, 4 is a motor, 5 is a gear set, and 6 is a connecting piece;

7 is a locking component, 701 is a button, 702 is a mounting disc, 703 is a rotating shaft, 704 is a hook-shaped element, and 705 is a spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The invention comprises a roller component 1, a fixing plate component 2, a main support 3, a motor 4 and a transmission mechanism, wherein the main support 3 is arranged on the fixing plate component 2, the roller component 1 is arranged on both sides of the main support 3, and the motor 4 is arranged in the main support 3; the roller component 1 comprises an inner roller 101, an outer roller 102, a main shaft 104, a supporting component and a transmission part 110, the supporting component is arranged on the fixed plate component 2, one end of the main shaft 104 is rotatably arranged on the supporting component, the other end of the main shaft is connected with the transmission part 110, and the motor 4 is connected with the main shafts 104 in the roller components 1 on two sides through a transmission mechanism arranged inside the fixed plate component 2 and drives the main shafts 104 on two sides to synchronously rotate reversely. The inner roller 101 is rotatably sleeved on the supporting component, the outer roller 102 is sleeved outside the inner roller 101 and supported by the inner roller 101, the transmission piece 110 is linked with the main shaft 104 and is in transmission with the outer roller 102 through the inner roller 101, or the transmission piece 110 is in direct connection with the outer roller 102, so that the outer rollers 102 on two sides of the main bracket 3 are driven to rotate reversely, and mopping mops are wrapped outside the outer rollers 102.

Example one

As shown in fig. 1 to 4 and fig. 10 to 14, the fixing plate assembly 2 of the present embodiment includes a fixing plate 204 and an outer cover, the outer cover is divided into an outer cover plate 201 and an inner cover plate 202, the inner and

outer cover plates

202 and 201 are connected to form a hollow outer cover, and the fixing plate 204 is fixed in the outer cover; the inner cover plate 202 is provided with three holes 203, the main support 3 is penetrated through the middle hole 203, and the other two holes 203 are used for penetrating the support components on the two sides. The main support 3 and the support components on both sides are mounted on the fixing plate 204, and the transmission mechanism is accommodated in the outer cover. A connecting piece 6 is arranged on the main bracket 3, and an operating handle of the floor-scrubbing machine is connected with the connecting piece 6 through a universal joint.

The transmission mechanism of this embodiment is a gear set 5, the gear set 5 includes two or more gears, a gear is connected to the output shaft of the motor 4, the number of gears on one side of the gear is one more than that on the other side of the gear, and therefore the main shafts 104 on two sides of the main support 3 rotate synchronously and reversely.

The supporting component of this embodiment is a bearing seat 105, one end of the bearing seat 105 is penetrated through a hole 203 on an inner cover plate 202 and is fixedly connected to the fixing plate component 2, the main shaft 104 is rotatably installed inside the bearing seat 105 through a bearing a106 and a bearing B107, the bearing a106 and the bearing B107 are respectively located at positions close to two ends of the bearing seat 105 to support and limit the main shaft 104; one end of the main shaft 104 is connected with the motor 4 through the gear set 5 and is driven by the motor 4 to rotate, the other end of the main shaft 104 penetrates out of the bearing seat 105, the end part of the main shaft is connected with a limiting cap 111 used for axially limiting the transmission piece 110, and a spigot is arranged on the limiting cap 111. The other end of the bearing seat 105 is connected with a locking piece 109 in a threaded manner, the locking piece 109 is positioned in the inner roller 101, a through hole is formed in the middle of the locking piece 109 and is used for the main shaft 104 to pass through, a spigot is arranged on one side, facing the bearing seat 105, of the locking piece 109 and is used for axially limiting the outer ring of the bearing B107, and the inner ring of the bearing B107 is axially limited through a shaft shoulder on the main shaft 104. The outer race of bearing a106 is axially restrained by a spigot on the inner surface of the bearing seat 105 and the inner race is axially restrained by a shoulder on the main shaft 104. The inner roller 101 is sleeved outside the bearing seat 105 and is rotationally connected with the bearing seat 105 through a bearing C108, the inner ring of the bearing C108 is axially limited through a seam allowance on the outer surface of the bearing seat 105, and the outer ring is axially limited through a seam allowance on the inner surface of the inner roller 101.

The transmission member 110 of the present embodiment is transmitted with the outer roller 102 through the inner roller 101. The transmission member 110 is located between the locking member 109 and the stopper cap 111 and located inside the end of the inner roller 101 away from the fixing plate assembly 2. The driving member 110 of this embodiment is disc-shaped and is keyed to the main shaft 104, and a plurality of external teeth 115 are uniformly distributed on the outer surface along the circumferential direction.

The inner drum 101 and the outer drum 102 of this embodiment are both hollow cylinders with both ends open. One end of the inner roller 101, which is far away from the fixed plate component 2, is uniformly distributed with engaging teeth 113 along the circumferential direction, and the inner surface of the end, which is close to the end, is uniformly distributed with tooth sockets 114 which are the same in number with the outer teeth 115 along the circumferential direction, and the outer teeth 115 on the transmission component 110 are meshed with the tooth sockets 114 for transmission. An engagement cylinder 103 is arranged in one end of the outer roller 102 far away from the fixed plate component 2, engagement teeth 113 are uniformly distributed on the engagement cylinder 103 along the circumferential direction, and the engagement teeth 113 on the engagement cylinder 103 are in engagement transmission with the engagement teeth 113 on the inner roller 101.

The end part of one end of the outer roller 102 far away from the fixing plate component 2 is provided with a locking component 7, the locking component 7 comprises a button 701, a mounting disc 702, a spring 705 and hook-shaped pieces 704, the mounting disc 702 is fixed on the meshing cylinder 103, the middle of the mounting disc 702 is provided with the button 701 capable of moving along the axial direction, the two sides of the button 701 are symmetrically provided with the hook-shaped pieces 704, the hook-shaped pieces 704 are positioned in the outer roller 102, the hook-shaped pieces 704 on each side are hinged to the mounting disc 702 through a rotating shaft 703, one end of each hook-shaped piece is abutted to the button 701, the other end of each hook-shaped. The outer roller 102 is inserted into and pushed into the root from one end of the inner roller 101 far away from the fixing plate assembly 2, the meshing teeth 113 on the inner roller 101 are meshed with the meshing teeth 113 on the meshing barrel 103, and the two hook-shaped members 704 in the locking assembly 7 are hooked at the seam allowance on the limiting cap 111, so that the inner roller 101 is driven to rotate when the main shaft 104 rotates, and the outer roller 102 is driven to rotate by the inner roller 101.

Example two

As shown in fig. 1 to 3, 5 to 6, 12 and 14 to 15, the present embodiment is different from the first embodiment in that: the transmission member 110 of this embodiment directly transmits with the outer roller 102, one end of the inner roller 101 of this embodiment is conical, the other end is cylindrical, the inside of the cylindrical portion is rotatably connected with the bearing seat 105 through the bearing C108, and the conical portion facilitates the insertion of the outer roller 102. The locker 109 of the present embodiment is different from the first embodiment in that the locker 109 is located outside the inner drum 101. The transmission element 110 of the present embodiment is located outside the inner roller 101 and inside the outer roller 102, and engaging teeth 113 are uniformly distributed on one end of the transmission element 110 away from the fixing plate assembly 2 along the circumferential direction. An engagement cylinder 103 is arranged inside one end of the outer roller 102 far away from the fixed plate component 2, engagement teeth 113 are uniformly distributed on the engagement cylinder 103 along the circumferential direction, and the engagement teeth 113 on the engagement cylinder 103 are in meshing transmission with the engagement teeth 113 on the transmission element 110. The rest is the same as the first embodiment.

EXAMPLE III

As shown in fig. 1 to 3, fig. 7 to 8, and fig. 10 to 14, the present embodiment is different from the first embodiment in that: the supporting assembly of this embodiment includes a bearing seat 105 and a supporting member 112, the other end of the bearing seat 105 and a locking member 109 screwed to the end are located inside the inner drum 101 near one end of the fixing plate assembly 2; a support member 112 is fitted over the main shaft 104 and keyed to the main shaft 104, the support member 112 being located on the side of the retaining member 109 remote from the fixed plate assembly 2. The inner drum 101 is fitted over the support 112 and supported by the support 112. In the embodiment, the transmission member 110, the inner roller 101, the outer roller 102, the transmission between the transmission member 110 and the inner roller 101, and the transmission between the inner roller 101 and the outer roller 102 are the same as those in the embodiment, the main shaft 104 drives the transmission member 110 to rotate, the transmission member 110 drives the inner roller 101 to rotate, and the main shaft 104 also drives the supporting member 112 to rotate, so that the inner roller 101 and the supporting member 112 rotate synchronously. This embodiment also allows to eliminate the transmission element 110 and to synchronize the rotation with the inner drum 101 by means of a keyed connection by the support element 112. The rest is the same as the first embodiment.

Example four

As shown in fig. 1 to 3 and fig. 9 to 14, the first embodiment is different from the first embodiment in that: the supporting components of the embodiment are the fixing plate 204 and the supporting member 112, and the fixing plate 204 is the fixing plate component 2, that is, the bearing seat 105 in the first embodiment is integrated with the housing and the fixing plate 204. The fixing plate 204 of the present embodiment has a hollow structure, one end of the main shaft 104 is rotatably mounted in the fixing plate 204 through a bearing a106 and a bearing B107, the outer rings of the bearing a106 and the bearing B107 are limited by the spigot in the fixing plate 204, and the inner ring is limited by the shoulder on the main shaft 104. A support member 112 is fitted over the main shaft 104 and is keyed to the main shaft 104, the support member 112 being located inside an end of the inner drum 101 adjacent to the fixed plate assembly 2. In the embodiment, the transmission member 110, the inner roller 101, the outer roller 102, the transmission between the transmission member 110 and the inner roller 101, and the transmission between the inner roller 101 and the outer roller 102 are the same as those in the embodiment, the main shaft 104 drives the transmission member 110 to rotate, the transmission member 110 drives the inner roller 101 to rotate, and the main shaft 104 also drives the supporting member 112 to rotate, so that the inner roller 101 and the supporting member 112 rotate synchronously. This embodiment also allows to eliminate the transmission element 110 and to synchronize the rotation with the inner drum 101 by means of a keyed connection by the support element 112. The rest is the same as the first embodiment.

The working principle of the invention is as follows:

when the device is installed, the outer roller 102 is inserted into and pushed into the root from one end of the inner roller 101 far away from the fixed plate assembly 2, the force of the limiting cap 111 applied to the other ends of the two hook-shaped elements 704 causes the two hook-shaped elements 704 to rotate outwards and expand around the respective rotating shafts 703 respectively until the limiting cap 111 enters between the two hook-shaped elements 704, and the two hook-shaped elements 704 are reset under the action of the springs 705 and locked at the seam allowance on the limiting cap 111. And then the outer drum 102 is wrapped with a cylindrical mop.

When the floor-scrubbing machine is used for scrubbing the floor, the handle is operated, so that the floor-scrubbing machine can realize universal operation, and the operation is extremely flexible. The motor 4 works, the main shaft 104 on the two sides is driven to rotate reversely through the gear set 5, the main shaft 104 drives the inner roller 101 and the outer roller 102 to rotate synchronously, the mop is driven to rotate through the outer roller 102 to wipe the floor, no gap is generated in the middle of the floor wiping machine in a left-right contra-rotating mode, the covering width is close to the width of the floor wiping machine when the floor wiping machine wipes the floor, and the floor wiping efficiency is higher and cleaner due to the front-back contra-rotating arrangement.

When detaching, the outer roller 102 can be drawn out by pressing the button 701 of the locking assembly 7 with the hand to open the hook-shaped members 704 on both sides against the elastic surface of the spring 705.

Claims

1. An electric floor-scrubbing machine, characterized in that: the automatic roller fixing device comprises a roller component (1), a fixing plate component (2), a main support (3), a motor (4) and a transmission mechanism, wherein the main support (3) is installed on the fixing plate component (2), the roller component (1) is arranged on each of two sides of the main support (3), and the motor (4) is installed in the main support (3); the roller component (1) comprises an inner roller (101), an outer roller (102), a main shaft (104), a supporting component and a transmission part (110), the supporting component is arranged on the fixed plate component (2), one end of the main shaft (104) is rotatably arranged on the supporting component, the other end of the main shaft (104) is connected with the transmission part (110), and the motor (4) is connected with the main shaft (104) in the roller components (1) at two sides through a transmission mechanism arranged in the fixed plate component (2) and drives the main shafts (104) at two sides to synchronously rotate in the reverse direction; the inner roller (101) is rotatably sleeved on the supporting component, the outer roller (102) is sleeved outside the inner roller (101), the transmission part (110) is linked with the main shaft (104) and is in transmission with the outer roller (102) through the inner roller (101), or the transmission part (110) is in direct connection with the outer roller (102) for transmission, so that the outer rollers (102) on two sides of the main support (3) are driven to rotate reversely, and mopping mops wrap the outer roller (102).

2. The electric floor scrubbing machine of claim 1, wherein: the supporting assembly is a bearing seat (105), the bearing seat (105) is installed on the fixing plate assembly (2), and the main shaft (104) is rotatably installed inside the bearing seat (105); the inner roller (101) is sleeved outside the bearing seat (105) and is rotatably connected with the bearing seat (105).

3. The electric floor scrubbing machine of claim 1, wherein: the supporting assembly comprises a bearing seat (105) and a supporting piece (112), the bearing seat (105) is installed on the fixing plate assembly (2), and the main shaft (104) penetrates through the inside of the bearing seat (105) and is rotatably connected with the bearing seat (105); the supporting piece (112) is arranged on the main shaft (104) and is linked with the main shaft (104); the inner drum (101) is sleeved outside the supporting member (112), supported by the supporting member (112), and rotates synchronously with the supporting member (112).

4. A motor-driven floor wiping machine according to claim 2 or 3, characterized in that: the main shaft (104) is rotatably connected with the bearing seat (105) through a bearing, a locking piece (109) is sleeved on the main shaft (104), and the locking piece (109) is in threaded connection with one end of the bearing seat (105) far away from the fixing plate assembly (2) and is limited in the axial direction of the bearing.

5. The electric floor scrubbing machine of claim 1, wherein: the supporting assembly comprises a fixing plate (204) and a supporting piece (112), the fixing plate (204) is the fixing plate assembly (2), the fixing plate (204) is of a hollow structure, and one end of the main shaft (104) is rotatably installed in the fixing plate (204); the supporting piece (112) is arranged on the main shaft (104) and is linked with the main shaft (104); the inner drum (101) is sleeved outside the supporting member (112), supported by the supporting member (112), and rotates synchronously with the supporting member (112).

6. The electric floor scrubbing machine of claim 1, wherein: one end of the inner roller (101) far away from the fixed plate component (2) is uniformly provided with meshing teeth (113) along the circumferential direction, and the inner surface of the end close to the end part is uniformly provided with tooth grooves (114) along the circumferential direction; the transmission piece (110) is positioned inside one end of the inner roller (101), and outer teeth (115) which are meshed with the tooth grooves (114) for transmission are uniformly distributed on the outer surface along the circumferential direction; an engagement cylinder (103) is arranged inside one end, far away from the fixed plate component (2), of the outer roller (102), engagement teeth (113) are uniformly distributed on the engagement cylinder (103) along the circumferential direction, and the engagement teeth (113) on the engagement cylinder (103) are in engagement transmission with the engagement teeth (113) on the inner roller (101).

7. The electric floor scrubbing machine of claim 1, wherein: when the transmission piece (110) is directly connected with the outer roller (102) for transmission, the transmission piece is positioned outside the inner roller (101) and inside the outer roller (102), and meshing teeth (113) are uniformly distributed at one end of the transmission piece (110) far away from the fixed plate component (2) along the circumferential direction; an engagement cylinder (103) is arranged inside one end, far away from the fixed plate component (2), of the outer roller (102), engagement teeth (113) are uniformly distributed on the engagement cylinder (103) along the circumferential direction, and the engagement teeth (113) on the engagement cylinder (103) are in meshing transmission with the engagement teeth (113) on the transmission piece (110).

8. The electric floor scrubbing machine of claim 1, wherein: the fixing plate assembly (2) comprises a fixing plate (204) and an outer cover, the outer cover is of a hollow structure, the fixing plate (204) is arranged in the outer cover, the main support (3) and the supporting assembly are both installed on the fixing plate (204), and the transmission mechanism is contained in the outer cover.

9. The electric floor scrubbing machine of claim 1, wherein: the end part of the other end of the main shaft (104) is connected with a limiting cap (111) of a limiting transmission part (110), and a spigot is arranged on the limiting cap (111); the end part, far away from the fixed plate component (2), of one end of the outer roller (102) is provided with a locking component (7), the locking component (7) comprises a button (701), a mounting disc (702), a spring (705) and hook-shaped pieces (704), the mounting disc (702) is fixed on the meshing cylinder (103), the mounting disc (702) is provided with the button (701) which can move along the axial direction, the hook-shaped pieces (704) are symmetrically arranged on two sides of the button (701), the hook-shaped pieces (704) are located in the outer roller (102), the hook-shaped pieces (704) on each side are hinged to the mounting disc (702), one end of each hook-shaped piece is abutted to the button (701), the other end of each hook-shaped piece is hooked, and the hook-shaped pieces (704) on two sides.

10. The electric floor scrubbing machine of claim 1, wherein: the transmission mechanism is a gear set (5), the gear set (5) comprises two gears which are larger than two, the output shaft of the motor (4) is connected with a gear, the number of the gears on one side of the gear is one more than that of the gears on the other side of the gear, and therefore the main shafts (104) on two sides of the main support (3) synchronously rotate reversely.