WO2023123727A1

WO2023123727A1 - Electric lifting mobile cart

Info

Publication number: WO2023123727A1
Application number: PCT/CN2022/085297
Authority: WO
Inventors: 常晓杰
Original assignee: 昆山泓杰电子股份有限公司
Priority date: 2021-12-27
Filing date: 2022-04-06
Publication date: 2023-07-06
Also published as: CN217003925U

Abstract

An electric lifting mobile cart, comprising a display device connecting assembly (1), an upper column (2), a lower column (3), and a mobile base assembly (4), wherein the lower column is fixedly mounted on the mobile base assembly, the upper column is mounted on the lower column in a longitudinally sliding manner, the display device connecting assembly is fixedly mounted on the upper column, and the display device connecting assembly is fixedly connected to the display device; and an electric drive device is further provided and comprises an electric motor assembly (5), a screw rod (6), a nut sleeve (7), and a lifting fixing member (8), the electric motor assembly being fixedly mounted on the mobile base assembly, a lower end of the screw rod being coaxially connected to a power output end of the electric motor assembly, the nut sleeve being movably screwed on the outside of the circumference of the screw rod, the lifting fixing member being fixedly mounted on an inner side wall of the upper column, and the nut sleeve being fixedly connected to the lifting fixing member. The electric lifting mobile cart is simple in overall structure, has a low production cost, is convenient to operate, is less prone to failure, can prevent an electric motor from becoming burnt out, and facilitates storage, transport, and rapid switching during use.

Description

Electric Lift Movable Cart

technical field

The utility model relates to a bracket, in particular to an electric lifting movable trolley.

Background technique

At present, in some public places such as conference rooms, classrooms and other environments, display devices are often installed on mobile cart-type brackets. Most of the current mobile carts are composed of a base and a column assembly that can be lifted. The column assembly changes the height of the display device through lifting operations, adapting to Due to different viewing requirements, the lifting operation of the column components is mostly done manually at present, which is inconvenient and cannot be completed by one person. At present, there are also some electric lifting mechanisms to realize the lifting of the display device, but the overall structure of the existing electric lifting mechanisms is complex and difficult to assemble. Inconvenient and prone to failure.

Utility model content

In order to make up for the above deficiencies, the utility model provides an electric lifting movable cart, which can realize the electric lifting of the display device, has a simple structure, is convenient to operate, and is not prone to failure.

The technical solution adopted by the utility model in order to solve its technical problems is: an electric lifting movable trolley, including a display device connection assembly, an upper column, a lower column and a movable base assembly, and the lower column is fixedly mounted on a movable On the base assembly, the upper column can be longitudinally slidably installed on the lower column, the display device connection assembly can be fixedly installed on the upper column, the display device connection assembly can be fixedly connected with the display device, and an electric drive device is also provided. The driving device includes a motor assembly, a screw, a nut sleeve and a lifting fixture. The motor assembly is fixedly installed on the movable base assembly. The lower end of the screw rod is coaxially connected with the power output end of the motor assembly. Outside the circumference of the screw mandrel, the lifting fixture is fixedly installed on the inner wall of the upper column, and the nut sleeve is fixedly connected with the lifting fixture.

As a further improvement of the utility model, the electric drive device further includes a bearing seat and at least one bearing, the bearing seat is fixedly mounted on the movable base assembly, and a stepped perforation with a lower inner diameter larger than an upper inner diameter is formed in the bearing seat, each The bearings are sequentially inserted on the inner side of the end with the larger diameter of the step of the bearing seat, the upper end of the stacked bearing stops on the step surface of the step perforation of the bearing seat, and the lower end of the stacked bearing stops on the upper surface of the movable base. A light column section is formed at the lower end of the screw rod, and the lower side of the thread at the bottom end of the screw rod forms a horizontal plane. The bearing is sleeved outside the circumference of the light column section at the lower end of the screw rod. In addition, a radially outwardly convex stop ring is formed on the outer wall of the outer circumference of the lower end of the light column section of the screw rod, and the radially outwardly convex stop ring stops on the lower end surface of the bearing at the lower end.

As a further improvement of the utility model, the motor assembly is fixedly installed on the lower side of the movable base assembly, and the movable base assembly is provided with a perforation for the lower end of the screw rod to pass through, and a non-circular connecting column is formed at the lower end of the screw rod. The power output end of the component is formed with a non-circular connection hole, and the non-circular connection column at the lower end of the screw rod is inserted in the non-circular connection hole of the motor power output end to stop in the circumferential direction.

As a further improvement of the utility model, the lifting fixture includes a fixed body, a column connecting piece, a sliding piece, a connecting screw and a nut connecting sleeve, the fixed body is formed with an avoidance perforation for the screw to pass through, and the column connecting piece Fixed on the two opposite side walls of the fixed body, the column connecting piece is closely attached to the inner side wall of the upper column, a horizontal threaded hole is formed on the column connecting piece, and a horizontally extending connection perforation is provided on the side wall of the upper column, and the sliding piece is sandwiched between In the gap between the upper column and the lower column, a countersunk hole is provided on the sliding piece, and the connecting screw passes through the countersunk hole of the sliding piece and the connecting hole of the upper column in sequence, and finally is screwed with the transverse threaded hole on the column connecting piece, The head of the connecting screw is fully accommodated in the countersunk head of the sliding piece, the nut connecting sleeve is fixedly arranged on the fixed body, the nut connecting sleeve is coaxially arranged with the avoidance perforation, and the nut sleeve is fixedly inserted in the nut connecting sleeve.

As a further improvement of the utility model, the lifting and fixing parts are integrally formed (such as metal bending parts, plastic parts or die-casting parts), the inner side of the nut connecting sleeve forms a square inner hole, and the outer wall of the nut sleeve circle is from top to bottom. Connect the square column section and the radially outwardly expanding stop section in turn, the connecting square column section is inserted into the square inner hole of the nut connecting sleeve with an interference fit, and the radially outwardly expanding stop section is stopped by the nut connecting sleeve On the surface of the lower end, there is also a circle of lack of meat avoiding ring on the connecting square column section, and there is a gap between the lack of meat avoiding ring and the side wall of the square inner hole of the nut connecting sleeve.

As a further improvement of the utility model, the upper end of the screw rod is also provided with a stop assembly, the stop assembly includes a blocking positioning sleeve, a step sleeve and a blocking connecting screw, a through hole is formed on the blocking positioning sleeve, and the step sleeve Form a T-shaped sleeve-like structure with the outer diameter of the upper end larger than the outer diameter of the lower end. The lower end of the step sleeve is inserted into the through hole of the blocking positioning sleeve, and the blocking connecting screw passes through the inner side of the step sleeve and is finally screwed with the screw hole at the upper end of the screw rod. The step The upper end of the sleeve is tightly clamped between the upper end surface of the blocking positioning sleeve and the head of the blocking connecting screw.

As a further improvement of the utility model, glue is used to fix the screw and the screw hole of the screw rod.

As a further improvement of the utility model, a control circuit board is also provided. The control circuit board is provided with a current detection device and a motor controller. The current detection device can detect the current of the circuit where the motor is located. The current detection device and the motor control The appliance is electrically connected and communicated, and the motor controller controls the start and stop of the motor.

As a further improvement of the utility model, a box structure is also provided, the box structure is fixed on the upper side of the movable base assembly, the lower column and the control circuit board are covered in the box structure, and the surface of the box structure is also provided There is a touch operation panel, the touch operation panel is electrically connected and communicated with the control circuit board, and the touch operation panel can send control instructions to the control circuit board.

As a further improvement of the utility model, the movable base assembly includes a base body, a supporting leg, a universal wheel and a positioning pin, and one end of the supporting leg is installed on a On the base body, the universal wheel is installed on the other end of the supporting leg. The universal wheel can be supported on the ground and rotate along the ground. The positioning pin can be axially slid along the rotating shaft and installed on the supporting leg or the base body. The base A pin hole eccentric to the rotating shaft is provided on the body or the supporting leg, and the positioning pin can be inserted into the pin hole.

The beneficial technical effects of the utility model are: the utility model realizes the axial stop positioning of the screw rod by installing the motor assembly and the screw rod on the base assembly, the bearing seat and the bearing mechanism, and the lifting and fixing parts are installed in the side wall of the upper column. , a nut sleeve is set on the lifting fixture, and then the lifting movement of the upper column is realized through the movable screw connection of the screw rod and the nut sleeve, and then the display device is driven up and down. It is separated from the screw rod, and at the same time, it detects the current of the circuit where the motor is located, realizes the learning of the lifting stroke of the display device, controls the number of turns of the motor running the screw rod, and controls the range of the upper column's lifting operation to prevent the motor from being burned out. To ensure the safe lifting of the display device, the utility model has the advantages of simple overall structure, low production cost, convenient operation, not easy to break down, convenient for storage and transportation, and quick conversion for use.

Description of drawings

Fig. 1 is the three-dimensional exploded view of the utility model;

Fig. 2 is the front view of the utility model;

Fig. 3 is a sectional view along A-A in Fig. 2;

Fig. 4 is the right view of the utility model;

Fig. 5 is a B-B sectional view when the upper column in Fig. 4 is in a descending state;

Fig. 6 is a B-B sectional view when the upper column in Fig. 4 is raised;

Fig. 7 is a front view of the electric driving device of the present invention;

Fig. 8 is a C-C sectional view in Fig. 7;

Fig. 9 is an exploded view of the electric drive device of the present invention;

Fig. 10 is an enlarged view of part D in Fig. 9;

Fig. 11 is a perspective view of the display device of the present invention in a high position in use;

Fig. 12 is a perspective view of the display device of the present invention in a low position in use;

Fig. 13 is a perspective view of the utility model in the storage state of the supporting legs.

Detailed ways

Embodiment: An electric lifting movable trolley, including a display device connection assembly 1, an upper column 2, a lower column 3 and a movable base assembly 4, the lower column 3 is fixedly mounted on the movable base assembly 4, and the upper column 2 is installed on the lower column 3 that can slide longitudinally, the display device connection assembly 1 can be fixedly installed on the upper column 2, the display device connection assembly 1 can be fixedly connected with the display device, and an electric drive device is also provided, and the electric drive The device includes a motor assembly 5, a screw rod 6, a nut sleeve 7 and a lifting fixture 8, the motor assembly 5 is fixedly mounted on the movable base assembly 4, and the lower end of the screw rod 6 is coaxially fixed with the power output end of the motor assembly 5 , nut cover 7 movable screw connection and screw mandrel 6 circumference outsides, lifting fixture 8 is fixedly installed on the inner wall of upper column 2, and nut cover 7 is fixedly connected with lifting fixture 8.

When in use, the movable base assembly 4 is placed on the ground, and the movable base assembly 4 is used to support the entire cart and realize the movement of the cart. The upper column 2 slides longitudinally relative to the lower column 3 to change the position of the display device connection assembly 1. Height adjustment, the utility model drives the screw rod 6 to rotate through the motor assembly 5, and then drives the upper column 2 to move up and down through the nut sleeve 7 and the lifting fixture 8, realizing the electric lifting of the display device on the cart, without manual adjustment, and easy to adjust. Labor saving, and the lifting movement device is hidden in the upper column 2 and the lower column 3, so that the cart has a beautiful appearance.

The electric driving device also includes a bearing seat 9 and at least one bearing 10, the bearing seat 9 is fixedly mounted on the movable base assembly 4, and a stepped perforation with a lower inner diameter greater than an upper inner diameter is formed in the bearing seat 9, and each bearing 10 is sequentially The upper end of the stacked bearing 10 stops on the step surface of the stepped perforation of the bearing seat 9, and the lower end of the stacked bearing 10 stops on the upper surface of the movable base. The lower end of the screw mandrel 6 is formed with a light column section, and the lower side of the thread at the lowermost end of the screw mandrel 6 forms a horizontal plane. The bearing 10 is sleeved on the outside of the circumference of the light column section at the lower end of the screw mandrel 6 , and the upper end of the bearing 10 at the upper end stops on the screw mandrel 6 On the horizontal surface of the lower side of the thread at the lowest end, a radially outwardly convex stop ring is formed on the outer wall of the circumference of the lower end of the light column section of the screw mandrel 6, and the radially outwardly convex stop ring stops on the lower end surface of the bearing 10 at the lower end. superior. The rotation positioning of the screw rod 6 on the movable base assembly 4 is realized through the bearing seat 9 and the bearing 10, and the axial limit of the screw rod 6 is realized through the bearing seat 9 and the bearing 10, and the screw rod 6 is in the bearing 10 The rotation is smooth, and the bearing 10 is preferably two or more, so that the stability of the upper column 2 is better when it is lifted. Arranged at intervals at the bottom to improve the load-carrying capacity, a circle of radially indented grooves is arranged on the outer wall of the circumference of the lower end of the light column section of the screw mandrel 6, and a circlip 11 is clamped in the radially indented grooves. The spring forms a radially outwardly convex stop ring.

The motor assembly 5 is fixedly mounted on the lower side of the movable base assembly 4, the movable base assembly 4 is provided with a perforation for the lower end of the screw mandrel 6 to pass through, the lower end of the screw mandrel 6 is formed with a non-circular connecting column, and the motor assembly 5 is powered A non-circular connection hole 12 is formed at the output end, and the non-circular connection column at the lower end of the screw rod 6 is inserted in the non-circular connection hole 12 at the output end of the motor so as to stop in the circumferential direction. The non-circular shape can be hexagonal, splined, etc. These structures are easily conceivable by those skilled in the art according to this patent, and all belong to the protection scope of this patent.

The lifting fixture 8 includes a fixed body 13, a column connecting piece 14, a sliding piece 15, a connecting screw 16 and a nut connecting sleeve 17, and the fixed body 13 is formed with an avoidance perforation for the screw mandrel 6 to pass through, and the column connecting piece 14 is fixed on the two opposite side walls of the fixed body 13, the column connecting piece 14 is closely attached to the inner side wall of the upper column 2, the column connecting piece 14 is formed with a transverse threaded hole, and the side wall of the upper column 2 is provided with a horizontally extending connection Perforation, the sliding sheet 15 is clamped in the gap between the upper column 2 and the lower column 3, the sliding sheet 15 is provided with countersunk holes, and the connecting screws 16 pass through the countersunk holes of the sliding sheet 15 and the holes of the upper column 2 in sequence. The connection perforation is finally screwed with the transverse threaded hole on the column connecting piece 14. The head of the connecting screw 16 is completely accommodated in the countersunk head of the sliding piece 15, and the nut connecting sleeve 17 is fixedly arranged on the fixed body 13, and the nut connecting The sleeve 17 is arranged coaxially with the avoidance perforation, and the nut sleeve 7 is fixedly inserted in the nut connecting sleeve 17 .

The column connecting piece 14, the sliding piece 15 and the connecting screw 16 together fix the fixed body 13 and the upper column 2 to form an integrated structure. The sliding piece 15 is clamped in the upper column 2 and the lower column 3 sidewall gaps, and the sliding piece 15 can be used for The outer surface of the upper column 2 is used for frictional sliding inside the inner surface of the lower column 3, which can effectively balance the upper column 2, so that the upper column 2 will not shake when sliding up and down. It is best to set a dynamic seal at the upper end of the lower column 3. The gap between the upper column 2 and the lower column 3 is dynamically sealed, and together with the connecting gasket, it forms a guiding support for the upper column 2 to prevent the upper column 2 from lifting and shaking. At the same time, the gap between the upper column 2 and the lower column 3 Carry out sealing, prevent dust from entering, protect the transmission mechanism in the upper column 2, and prevent its damage and failure.

The lifting and fixing part 8 is an integrated structure (such as a metal bending part, a plastic part or a die-casting part), a square inner hole is formed on the inner side of the nut connecting sleeve 17, and the outer wall of the nut sleeve 7 is sequentially connected to the square column from top to bottom. section and the radially outwardly expanding stop section, the connecting square column section is inserted into the square inner hole of the nut connecting sleeve 17 with an interference fit, and the radially outwardly expanding stop section is stopped on the surface of the lower end of the nut connecting sleeve 17 , The connecting square column section is also provided with a circle of lack of meat avoiding ring, and there is a gap between the lack of meat avoiding ring and the side wall of the square inner hole of the nut connecting sleeve 17.

The lifting fixture 8 of this structure is simple in structure and is convenient for production and manufacture. The nut sleeve 7 is connected to the nut sleeve 17 by welding and fixing by connecting the square column section. and axial stop positioning, and at the same time, a circle of lack of flesh avoidance ring is formed on the connecting square column section of nut sleeve 7. This lack of flesh avoidance ring can be a cylindrical section inscribed and connected to the square column, and this structure can reduce the size of the nut. The resistance of the interference connection between the sleeve 7 and the nut connecting sleeve 17 facilitates the fast assembly of the nut sleeve 7 and the nut connecting sleeve 17 .

The upper end of the screw mandrel 6 is also provided with a stop assembly 18, the stop assembly 18 includes a blocking positioning sleeve 19, a step sleeve 20 and a blocking connecting screw 21, the blocking positioning sleeve 19 is formed with a through hole, and the step sleeve 20 Form a T-shaped sleeve-like structure with an outer diameter of the upper end greater than that of the lower end. The lower end of the step sleeve 20 is inserted into the through hole of the blocking positioning sleeve 19, and the blocking connecting screw 21 passes through the inner side of the step sleeve 20 and finally connects with the screw on the upper end of the screw rod 6. The holes are screwed, and the upper end of the step sleeve 20 is tightly sandwiched between the upper end surface of the blocking positioning sleeve 19 and the head of the blocking connecting screw 21 . The stop assembly 18 prevents the lifting fixture 8 from moving to the upper end of the screw rod 6 and then falls. When the lifting fixture 8 rises to the top, it is blocked by the stop assembly 18 and cannot continue to go up, which plays a role of safety height limit. 20 is preferably iron material. When the lifting initialization stroke range is set, the stopper assembly is lifted by the lifting fixture 8, and the control board can detect the instantaneous increase of the current when it encounters resistance, and determines the stroke position when it encounters resistance.

Glue is used to bond and fix the screw and the screw hole of the screw rod. Prevent from blocking the connecting screw 21 from loosening and falling off with the screw mandrel 6 when the nut cover 7 moves up and down along the screw mandrel 6 .

Also provided with a control circuit board, the control circuit board is provided with a current detection device and a motor controller, the current detection device can detect the current of the circuit where the motor is located, the current detection device is electrically connected to the motor controller for communication, and the motor control The controller controls the start and stop of the motor.

When the lifting fixture 8 moves to the top or lower end of the screw rod 6, it is blocked by the stopper assembly 18 and the bearing seat 9 and cannot continue to rise or fall. At this time, the screw rod 6 cannot continue to rotate, and the motor assembly 5 is subjected to rotation resistance. The circuit current increases instantly, exceeding the initial memory current range, and it will return to the 5mm stroke to prevent the motor from running too hard when it is running, and complete the stroke range setting.

A box structure 26 is also provided. The box structure 26 is fixed on the upper side of the movable base assembly 4. The lower column 3 and the control circuit board are covered in the box structure 26. The surface of the box structure 26 is also provided with a touch The touch operation panel 27 is electrically connected and communicated with the control circuit board, and the touch operation panel 27 can send control instructions to the control circuit board. The motor assembly 5 can be controlled through the touch panel, such as controlling the upper column 2 to rise, fall, lock the screen, reset, memorize the set height position, etc., and the box structure 26 can also form an accommodation space for placing a display device Peripheral products.

The movable base assembly 4 includes a base body 22, a supporting leg 23, a universal wheel 24 and a positioning pin 25, and one end of the supporting leg 23 is installed on the base body to rotate around a rotating shaft with an acute angle or a right angle with the vertical direction. 22, the universal wheel 24 is installed on the other end of the supporting leg 23, the universal wheel 24 can be supported on the ground and rotate along the ground, and the positioning pin 25 can be installed on the supporting leg 23 or the base body 22 so that it can slide axially along the rotating shaft Above, the base body 22 or the support leg 23 is provided with a pin hole eccentric to the rotating shaft, and the positioning pin 25 can be inserted into the pin hole. By rotating the support leg 23 around the rotating shaft that has an acute angle with the vertical direction, the horizontal support and vertical folding of the support leg 23 can be realized quickly. After plugged in, the fixed positioning of the support leg 23 and the base body 22 can be realized. The structure is simple, and the support leg 23 is convenient to expand, support and quickly fold, and the operation is convenient. The side wall of the body is also preferably provided with a space for accommodating the supporting legs 23. When the supporting legs 23 are folded, they can be accommodated in the space to keep the cart clean and beautiful. The positioning pins 25 are preferably installed on the on the supporting legs 23 to prevent loss and drop.

Claims

An electric lifting movable trolley, comprising a display device connection assembly (1), an upper column (2), a lower column (3) and a movable base assembly (4), the lower column is fixedly mounted on the movable base assembly , the upper column can be longitudinally slidably installed on the lower column, the display device connection assembly can be fixedly installed on the upper column, the display device connection assembly can be fixedly connected with the display device, and it is characterized in that: an electric drive device is also provided, the The electric driving device includes a motor assembly (5), a screw rod (6), a nut sleeve (7) and a lifting fixture (8). The output end is coaxially fixedly connected, the nut sleeve is movable and screwed to the outside of the screw rod circumference, the lifting fixture is fixedly installed on the inner wall of the upper column, and the nut sleeve is fixedly connected with the lifting fixture.
The electric lifting mobile trolley according to claim 1, characterized in that: the electric drive device also includes a bearing seat (9) and at least one bearing (10), and the bearing seat is fixedly installed on the movable base assembly , There is a stepped perforation hole with a lower inner diameter larger than the upper inner diameter formed in the bearing seat, and each bearing is sequentially inserted inside the end with the larger diameter of the stepped hole of the bearing seat, and the upper end of the stacked bearing stops on the step surface of the stepped perforated hole of the bearing seat, stacked The lower end of the bearing is stopped on the upper surface of the movable base, the lower end of the screw rod forms a light column section, the lower side of the thread at the bottom end of the screw rod forms a horizontal plane, the bearing is sleeved on the outer side of the circumference of the light column section at the lower end of the screw rod, and the upper end The upper end of the bearing is stopped on the horizontal plane under the thread at the bottom end of the screw rod, and a radially outwardly convex stop ring is formed on the outer wall of the circumference of the lower end of the light column section of the screw rod, and the radially outwardly convex stop ring stops On the lower end surface of the bearing at the lower end.
The electric lifting movable trolley according to claim 2 is characterized in that: the motor assembly is fixedly installed on the lower side of the movable base assembly, and the movable base assembly is provided with a perforation for the lower end of the screw rod to pass through, and the screw rod The lower end is formed with a non-circular connecting column, and the power output end of the motor assembly is formed with a non-circular connecting hole (12). inside the connecting hole.
The electric lift movable trolley according to claim 3, characterized in that: the lifting fixture includes a fixed body (13), a column connecting piece (14), a sliding piece (15), connecting screws (16) and nuts Connecting sleeve (17), the fixed body is formed with an avoidance perforation for the screw to pass through, the column connecting piece is fixed on the two opposite side walls of the fixed body, the column connecting piece is closely attached to the inner side wall of the upper column, and the column is connected A horizontal threaded hole is formed on the sheet, and a horizontally extending connection perforation is provided on the side wall of the upper column. The sliding sheet is sandwiched in the gap between the upper column and the lower column, and the sliding sheet is provided with a countersunk hole. The countersunk hole of the sliding sheet and the connecting hole of the upper column are finally screwed with the transverse threaded hole on the column connecting sheet. The head of the connecting screw is completely accommodated in the countersunk head of the sliding sheet, and the nut connecting sleeve is fixed on the fixed body Above, the nut connecting sleeve is arranged coaxially with the avoidance perforation, and the nut sleeve is fixedly inserted in the nut connecting sleeve.
The electric lift movable trolley according to claim 1, characterized in that: said lifting and fixing member is integrally formed, a square inner hole is formed on the inner side of the nut connecting sleeve, and the circumferential outer wall of said nut sleeve is sequentially connected from top to bottom The square column section and the radially outwardly expanding stop section, the connecting square column section is inserted into the square inner hole of the nut connecting sleeve with an interference fit, and the radially outwardly expanding stop section stops on the lower surface of the nut connecting sleeve , The connecting square column section is also provided with a circle of lack of meat avoiding ring, and there is a gap between the lack of meat avoiding ring and the side wall of the square inner hole of the nut connecting sleeve.
The electric lifting mobile cart according to claim 5, characterized in that: the upper end of the screw rod is also provided with a stop assembly (18), and the stop assembly includes a blocking positioning sleeve (19), a step sleeve (20 ) and blocking connecting screws (21), the blocking positioning sleeve is formed with a through hole, the step sleeve forms a T-shaped sleeve structure with an outer diameter of the upper end greater than the outer diameter of the lower end, and the lower end of the step sleeve is inserted in the through hole of the blocking positioning sleeve The blocking connecting screw passes through the inner side of the step sleeve and is finally screwed with the screw hole at the upper end of the screw rod, and the upper end of the step sleeve is tightly sandwiched between the upper end surface of the blocking positioning sleeve and the head of the blocking connecting screw.
The electric lift movable cart according to claim 6, characterized in that: the screw and the screw hole of the screw rod are bonded and fixed by glue.
The electric lift movable cart according to claim 6 is characterized in that: a control circuit board is also provided, and the control circuit board is provided with a current detection device and a motor controller, and the current detection device can detect where the motor is located. The electric current of the circuit, the current detection device is electrically connected and communicated with the motor controller, and the motor controller controls the start-stop action of the motor.
The electric lift movable cart according to claim 8 is characterized in that: a box structure (26) is also provided, the box structure is fixed on the upper side of the movable base assembly, and the lower column and the control circuit board package Covered in the box structure, a touch operation panel (27) is provided on the surface of the box structure, the touch operation panel is electrically connected and communicated with the control circuit board, and the touch operation panel can send control instructions to the control circuit board.
The electric lifting movable trolley according to claim 1, characterized in that: the movable base assembly includes a base body (22), supporting legs (23), universal wheels (24) and positioning pins (25), One end of the supporting leg is installed on the base body to rotate around a rotating shaft that has an acute angle or a right angle with the vertical direction, and the universal wheel is installed on the other end of the supporting leg, and the universal wheel can be supported on the ground and rotate along the ground , the positioning pin can be installed on the supporting leg or the base body axially sliding along the rotating shaft, the base body or the supporting leg is provided with a pin hole eccentric to the rotating shaft, and the positioning pin can be inserted into the pin hole .