CN217243133U - Linear transmission assembly and electric lifting table leg - Google Patents

Abstract

The utility model discloses a linear transmission assembly and an electric lifting table leg, which comprises a transmission pipe, a first wire pipe, a second wire pipe and a lead screw, wherein the transmission pipe is connected with a driving mechanism in a transmission way, the first wire pipe can synchronously rotate with the transmission pipe, the first wire pipe and the transmission pipe can relatively slide along the axial direction to generate displacement, the first transmission nut with limited circumferential rotation is connected on the first wire pipe in a threaded way, and the first transmission nut is axially limited at the lower end of the transmission pipe relative to the transmission pipe; the second wire tube can synchronously rotate with the first wire tube, the second wire tube and the first wire tube can relatively slide along the axial direction to generate displacement, a second transmission nut with limited circumferential rotation is connected to the second wire tube in a threaded manner, and the second transmission nut is axially limited at the lower end of the first wire tube relative to the first wire tube; the lead screw is in threaded connection with the third transmission nut, and the lower end of the lead screw is fixedly connected to the bottom plate. The linear transmission assembly and the electric lifting table leg are simple in structure, convenient to assemble, high in safety and high in transmission stability.

Description

Linear transmission assembly and electric lifting table leg

Technical Field

The utility model relates to a mechanical transmission technical field, what specifically say is a linear transmission assembly and electric lift table leg.

Background

The lifting table legs in the prior art generally comprise a driving mechanism, an inner pipe, a middle pipe and an outer pipe which are nested with each other and can relatively move and stretch, the upper end of the inner pipe is connected with an outer shell of the driving mechanism, and the lower end of the outer pipe is contacted with the ground; the inner tube is internally provided with a linear transmission assembly, and the linear transmission assembly generally consists of a lead screw, a wire tube and a transmission nut. For example, the prior application of the present applicant, which is published under the name of CN211203490U, discloses a transmission assembly and a lifting column applied thereto, and discloses a structure including a transmission tube in transmission connection with a driving mechanism; the outer side wall of the first wire tube is provided with external threads and is positioned in the transmission tube, the first wire tube can synchronously rotate with the transmission tube, the first wire tube and the transmission tube can relatively slide along the axial direction to generate displacement, and a first transmission nut is connected to the first wire tube in a threaded manner; the outer side wall of the second wire tube is provided with external threads and is positioned in the first wire tube, the second wire tube can synchronously rotate with the first wire tube, the second wire tube and the first wire tube can relatively slide along the axial direction to generate displacement, a second transmission nut is connected to the second wire tube in a threaded manner, and a first connecting seat capable of limiting the second transmission nut to rotate is connected to the second transmission nut; the lead screw is positioned in the second wire tube, the lead screw can synchronously rotate with the second wire tube, the lead screw and the second wire tube can relatively slide along the axial direction to generate displacement, the lead screw is in threaded connection with a third transmission nut, and the third transmission nut is connected with a second connecting seat capable of limiting the third transmission nut to rotate. The linear transmission assembly in the prior art has a complex structure, high production cost and troublesome assembly; when the first wire tube slides to the lower end of the transmission tube relative to the transmission tube, the risk of separation of the first wire tube and the transmission tube is possibly caused due to no axial limit, and the safety is poor; in addition, when the lifting table leg using the linear transmission assembly is lifted actually, and the worm at the driving end of the driving motor drives the worm wheel to rotate, the shaking generated by the worm wheel is often transmitted to the driving shaft of the linear transmission assembly, so that the transmission of the linear transmission assembly is not stable or noise is generated.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is, overcome the defect of above prior art, provide a simple structure, equipment convenience, low in production cost and security height, the high linear transmission assembly of transmission stationarity.

The technical solution of the utility model is to provide a have following structure linear transmission assembly: it comprises

The transmission pipe is in transmission connection with the driving mechanism;

the outer side wall of the first wire pipe is provided with external threads and is positioned in the transmission pipe, the first wire pipe can synchronously rotate with the transmission pipe, the first wire pipe and the transmission pipe can relatively slide along the axial direction to generate displacement, the first wire pipe is in threaded connection with a first transmission nut with limited circumferential rotation, and the first transmission nut is axially limited at the lower end of the transmission pipe relative to the transmission pipe;

the outer side wall of the second wire pipe is provided with an external thread and is positioned in the first wire pipe, the second wire pipe can synchronously rotate with the first wire pipe, the second wire pipe and the first wire pipe can relatively slide along the axial direction to generate displacement, the second wire pipe is in threaded connection with a second transmission nut with limited circumferential rotation, and the second transmission nut is axially limited at the lower end of the first wire pipe relative to the first wire pipe;

the lead screw is positioned in the second lead screw pipe, a third transmission nut is connected to the inner wall of the lower end of the second lead screw pipe, the lead screw is in threaded connection with the third transmission nut, and the lower end of the lead screw is fixedly connected to the bottom plate.

Preferably, a plurality of first sliding grooves which extend along the axial direction of the transmission pipe and are distributed along the circumferential direction of the transmission pipe are formed in the inner circumferential wall of the transmission pipe, a first sliding block is connected to the upper end of the first wire pipe, and a first radial protruding block which is correspondingly clamped with the first sliding grooves is arranged on the outer side wall of the first sliding block; the top of first transmission nut is equipped with the annular convex wall that upwards extends, annular convex wall be located between transmission pipe and the first silk pipe and can supply first slider to offset when first silk pipe is to keeping away from the transmission pipe direction removal.

Preferably, the inner circumferential wall of the first wire tube is provided with a plurality of second sliding grooves which extend along the axial direction of the first wire tube and are distributed along the circumferential direction of the first wire tube, the upper end of the second wire tube is connected with a second sliding block, and the outer side wall of the second sliding block is provided with a second radial protruding block which is correspondingly clamped with the second sliding grooves.

Preferably, the second transmission nut is connected with a bearing, and an inner ring of the bearing is connected to an outer side wall of the lower end of the first wire tube, so that the first wire tube is rotatably connected with the second transmission nut through the bearing and the first wire tube and the second transmission nut can move synchronously along the axial direction.

Preferably, the third transmission nut is sleeved with the connecting seat, and the third transmission nut can rotate circumferentially and is limited axially relative to the connecting seat.

Preferably, the lower end of the third transmission nut is provided with an annular boss extending radially outwards; the connecting seat is internally connected with a limiting seat, an annular cavity is formed between the limiting seat and the connecting seat, and the annular boss is in clearance fit in the annular cavity.

After the structure above adopting, the utility model relates to a linear transmission assembly compares with prior art, has following advantage: the linear transmission assembly is composed of a transmission tube, a first wire tube, a second wire tube and a lead screw which are sequentially sleeved from outside to inside, wherein the transmission tube, the first wire tube, the second wire tube and the lead screw can synchronously rotate; the first wire tube is relative to the transmission tube, the second wire tube is relative to the first wire tube, and the lead screw is relative to the second wire tube and can slide relatively to generate displacement; therefore, the linear transmission assembly has larger stroke and can meet the requirement of maximizing the stroke of the lifting table legs. Compared with the prior art that the first transmission nut can axially move and the third transmission nut needs to be connected to the lower end of the second wire tube through a support, the first transmission nut is simpler to assemble, and has better structural stability and coaxiality of the third transmission nut and the second wire tube; in addition, the top of the first transmission nut is provided with an annular convex wall which is positioned between the transmission pipe and the first wire pipe and can be abutted by the first sliding block when the first wire pipe moves towards the direction far away from the transmission pipe; therefore, the annular convex wall not only ensures the coaxiality between the transmission tube and the first wire tube and prevents the transmission tube and the first wire tube from shaking, but also can prevent the first wire tube from being separated from the transmission tube when moving axially downwards; moreover, the annular convex wall is arranged to be abutted against the lower end of the transmission pipe and is used for limiting the vibration or swing of the lower end of the transmission pipe, so that the transmission pipe is prevented from being in friction collision with the first wire pipe, and the structural stability and the safety of the linear transmission assembly are better.

Another technical solution of the present invention is to provide an electric table leg with the following structure, which comprises a first vertical pipe, a second vertical pipe, a third vertical pipe and a fourth vertical pipe, which are sequentially sleeved from inside to outside and can slide relatively, a housing fixedly connected to the upper end of the first vertical pipe, a driving motor disposed in the housing, and a linear transmission assembly in transmission connection with the driving motor, wherein the linear transmission assembly adopts the linear transmission assembly according to any one of the above technical solutions; the outer side wall of a first transmission nut on the inner wall of the first vertical pipe is connected, the outer side wall of a second transmission nut on the inner wall of the second vertical pipe is connected, the outer side wall of a third transmission nut on the inner wall of the third vertical pipe is connected, and the lower end of a fourth vertical pipe is connected with the bottom plate. The upper end of the transmission pipe is coaxially connected with a driving shaft, the driving shaft is connected with a worm wheel which is in transmission connection with a driving motor, and the driving shaft is provided with an annular groove and a gap is reserved between the annular groove and the inner wall of a central hole of the worm wheel.

After the structure above the adoption, the utility model discloses electric lift table leg compares with prior art, has following advantage: this electric lift table leg adopts above-mentioned any technical scheme linear transmission assembly to make the stroke increase of this electric lift table leg, satisfy people to lift table leg stroke maximize demand, and annular groove's setting on the drive shaft, thereby it is little to have the clearance to make area of contact between the two between worm wheel and the drive shaft, thereby avoid rocking of worm wheel production to transmit to the drive shaft on, or weaken the drive shaft and receive the worm wheel to produce the influence of rocking, thereby make the lift stationarity of lift table leg good.

Drawings

Fig. 1 is a schematic structural diagram of the linear transmission assembly of the present invention.

Fig. 2 is a schematic cross-sectional structural view of the linear transmission assembly of the present invention.

Fig. 3 is a schematic cross-sectional view of another angle of the linear transmission assembly of the present invention.

Fig. 4 is an enlarged schematic view of a portion a of the linear transmission assembly in fig. 3.

Fig. 5 is an enlarged schematic view of a portion B of the linear transmission assembly of the present invention in fig. 3.

Fig. 6 is an enlarged schematic view of a portion C of the linear transmission assembly of the present invention in fig. 3.

Fig. 7 is a schematic structural view of the electric lifting table leg of the present invention.

Fig. 8 is a schematic view of the sectional structure of the electric lifting table leg of the present invention.

Fig. 9 is a partially enlarged structural schematic view of the electric lifting table leg of the present invention.

As shown in the figure:

1. the transmission device comprises a transmission pipe, 100, a first wire pipe, 101, a second wire pipe, 102, a lead screw, 103, a first sliding groove, 104, a first sliding block, 105, a first radial projection, 106, a second sliding groove, 107, a second sliding block, 108, a second radial projection, 2, a first transmission nut, 200, a second transmission nut, 201, a third transmission nut, 202, an annular convex wall, 203, a bearing, 204, a connecting seat, 205, a limiting seat, 206, an annular cavity, 207, an annular boss, 3, a driving shaft, 300, an annular groove, 301, a worm gear, 4, a first stand pipe, 400, a second stand pipe, 401, a third stand pipe, 402, a fourth stand pipe, 403, a bottom plate, 5 and a driving mechanism.

Detailed Description

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

As shown in fig. 1 to 6;

the utility model relates to a linear transmission assembly, also called linear driving mechanism, is used for installing in the lift table leg, is used for driving the relative flexible of inner, outer tube of lift table leg, and its structure includes drive tube 1 of being connected with drive mechanism 5 transmission, and the drive mechanism 5 of this embodiment is driving motor, and the top coaxial coupling of drive tube 1 has drive shaft 3, installs worm wheel 301 on drive shaft 3, the pivot of driving motor connect one with worm wheel 301 transmission connection worm; the linear transmission assembly further comprises a first wire tube 100, a second wire tube 101 and a lead screw 102, wherein the outer side wall of the first wire tube 100 is provided with external threads and is positioned in the transmission tube 1, the first wire tube 100 can synchronously rotate with the transmission tube 1, the first wire tube 100 and the transmission tube 1 can relatively slide along the axial direction to generate displacement, the first wire tube 100 is in threaded connection with a first transmission nut 2 with limited circumferential rotation, and the first transmission nut 2 is axially limited at the lower end of the transmission tube 1 relative to the transmission tube 1; the first wire tube 100 is driven to rotate synchronously when the transmission tube 1 rotates, and the first wire tube 100 can slide axially relative to the transmission tube 1 to realize stretching and retracting due to the fixed position and the limited circumferential rotation of the first transmission nut 2. When the linear transmission assembly is installed in the lifting table leg, the first transmission nut 2 is fixedly connected to the lower end of the inner tube of the lifting table leg, wherein the upper end of the inner tube of the lifting table leg is fixedly connected with the bottom of the driving mechanism 5, so that the circumferential rotation of the first transmission nut 2 is limited and no movement displacement is generated in the axial direction relative to the transmission tube 1; when the driving mechanism 5 drives the transmission tube 1 to rotate, the first transmission nut 2 is always kept in a static state relative to the lifting table legs.

The outer side wall of the second wire tube 101 is provided with an external thread and is positioned in the first wire tube 100, the second wire tube 101 can synchronously rotate with the first wire tube 100, the second wire tube 101 and the first wire tube 100 can relatively slide along the axial direction to generate displacement, the second wire tube 101 is in threaded connection with a second transmission nut 200 with limited circumferential rotation, and the second transmission nut 200 is axially limited at the lower end of the first wire tube 100 relative to the first wire tube 100; similarly, the first wire tube 100 rotates and simultaneously drives the second wire tube 101 to rotate, and the circumferential rotation of the second transmission nut 200 is limited, the second transmission nut 200 is axially limited at the lower end of the first wire tube 100, the second transmission nut 200 synchronously moves along the axial direction along with the first wire tube 100, and the second wire tube 101 synchronously moves and stretches along the axial direction; the lead screw 102 is located in the second wire tube 101, the inner wall of the lower end of the second wire tube 101 is connected with a third transmission nut 201, the lead screw 102 is in threaded connection with the third transmission nut 201, and the lower end of the lead screw 102 is fixedly connected to the bottom plate 403. The second wire tube 101 rotates and simultaneously drives the third transmission nut 201 to rotate, and due to the threaded connection relationship between the third transmission nut 201 and the lead screw 102, the third transmission nut 201 rotates along with the second wire tube 101 and simultaneously enables the lead screw 102 to do axial telescopic motion.

The linear transmission assembly is composed of a transmission tube 1, a first wire tube 100, a second wire tube 101 and a lead screw 102 which are sequentially sleeved from outside to inside, wherein the transmission tube 1, the first wire tube 100, the second wire tube 101 and the lead screw 102 can synchronously rotate; the first wire tube 100 can slide relatively relative to the transmission tube 1, the second wire tube 101 can slide relatively relative to the first wire tube 100 and the lead screw 102 can slide relatively to the second wire tube 101 to generate displacement; the working principle of the linear transmission assembly is as follows: when the driving mechanism 5 drives the driving tube 1 to rotate, the driving tube 1 drives the first wire tube 100, the first wire tube 100 drives the second wire tube 101 to synchronously rotate along with the driving tube, and the first wire tube 100 is in threaded connection with the first driving nut 2, the second wire tube 101 is in threaded connection with the second driving nut 200, and the lead screw 102 is in threaded connection with the third driving nut 201, so that the first wire tube 100 can axially move relative to the driving tube 1, the second wire tube 101 can axially move relative to the first wire tube 100, and the lead screw 102 can axially move relative to the second wire tube 101; meanwhile, the second driving nut 200 moves synchronously along the axial direction along with the first wire tube 100, and the third driving nut 201 moves synchronously along the axial direction along with the second wire tube 101. Therefore, the linear transmission assembly has a large stroke and can meet the maximum stroke requirement of the lifting table legs. This 2 circumference of first drive nut is rotatory by restriction and axial position is fixed to and third drive nut 201 lug connection is on the lower extreme inner wall of second silk pipe 101, among the prior art, but first drive nut 2 axial displacement and third drive nut 201 need compare at the lower extreme of second silk pipe 101 through the support connection, and its assembly is simpler, and structural stability and third drive nut 201 are better with the axiality of second silk pipe 101.

Referring to fig. 2, 3 and 4 again, a plurality of first sliding grooves 103 extending axially along the inner circumferential wall of the transmission tube 1 and distributed circumferentially along the inner circumferential wall are provided on the inner circumferential wall of the transmission tube 1, a first sliding block 104 is connected to the upper end of the first wire tube 100, and a first radial protrusion 105 correspondingly clamped with the first sliding grooves 103 is provided on the outer side wall of the first sliding block 104; the top of the first transmission nut 2 is provided with an annular convex wall 202 extending upwards, and the annular convex wall 202 is located between the transmission tube 1 and the first wire tube 100 and can be abutted by the first sliding block 104 when the first wire tube 100 moves towards the direction far away from the transmission tube 1. The top of the first transmission nut 2 is provided with an annular convex wall 202 which is positioned between the transmission tube 1 and the first wire tube 100 and can be abutted against the first sliding block 104 when the first wire tube 100 moves towards the direction far away from the transmission tube 1; thus, the annular convex wall 202 not only ensures the coaxiality between the transmission tube 1 and the first wire tube 100 and prevents the transmission tube 1 and the first wire tube 100 from shaking, but also prevents the first wire tube 100 from being separated from the transmission tube 1 when moving axially downwards, so that the structural stability and the safety of the linear transmission assembly are better.

Referring to fig. 2, 3 and 5 again, the inner circumferential wall of the first wire tube 100 is provided with a plurality of second sliding grooves 106 extending along the axial direction and distributed along the circumferential direction, the upper end of the second wire tube 101 is connected with a second sliding block 107, and the outer side wall of the second sliding block 107 is provided with a second radial protrusion 108 correspondingly clamped with the second sliding grooves 106. The second driving nut 200 is connected with a bearing 203, and an inner ring of the bearing 203 is connected to an outer side wall of the lower end of the first wire tube 100, so that the first wire tube 100 is rotatably connected with the second driving nut 200 through the bearing 203 and the first wire tube 100 and the second driving nut 200 can move synchronously along the axial direction.

Referring to fig. 6 again, the third driving nut 201 is sleeved with the connecting seat 204, and the third driving nut 201 can rotate circumferentially and is limited axially relative to the connecting seat 204. The lower end of the third transmission nut 201 is provided with an annular boss 207 extending outwards in the radial direction; the connecting seat 204 is connected with a limiting seat 205, an annular cavity 206 is formed between the limiting seat 205 and the connecting seat 204, and the annular boss 207 is in clearance fit in the annular cavity 206. The third driving nut 201 is directly connected to the inner wall of the lower end of the second wire tube 101 and can rotate relatively in the limiting seat 205 and the connecting seat 204 forming an annular cavity 206, so that the installation of a bearing is omitted, the connecting seat 204 can be connected with a pipe fitting of the lifting table leg, and the lifting table leg is simple in structure and convenient to install.

Referring to fig. 7 to 9, the embodiment discloses an electric lifting table leg, which includes a first vertical pipe 4, a second vertical pipe 400, a third vertical pipe 401 and a fourth vertical pipe 402 that are sequentially sleeved from inside to outside and can relatively slide, a housing fixedly connected to the upper end of the first vertical pipe 4, a driving motor disposed in the housing, and a linear transmission assembly in transmission connection with the driving motor, wherein the linear transmission assembly adopts the linear transmission assembly according to any one of the embodiments; the outer side wall of the first transmission nut 2 on the inner wall of the first vertical pipe 4 is connected, the outer side wall of the second transmission nut 200 on the inner wall of the second vertical pipe 400 is connected, the outer side wall of the third transmission nut 201 on the inner wall of the third vertical pipe 401 is connected, and the lower end of the fourth vertical pipe 402 is connected with the bottom plate 403. The upper end coaxial coupling of transmission pipe 1 a drive shaft 3, drive shaft 3 on connect a worm wheel 301 of being connected with the driving motor transmission, drive shaft 3 on be equipped with annular groove 300 and have the clearance between the inner wall of annular groove 300 and worm wheel 301 centre bore. The electric lifting table leg is of a four-tube lifting structure, and the requirement for maximizing the stroke of the lifting table leg can be met. In addition, the setting of annular groove 300 on drive shaft 3 makes thereby have the clearance between worm wheel 301 and the drive shaft 3 and make area of contact between the two little to avoid rocking of worm wheel 301 production to transmit to drive shaft 3 on, or weaken drive shaft 3 and produce the influence of rocking by worm wheel 301, thereby make the lift stationarity of lift table leg good.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. A linear drive assembly, characterized by: it comprises

The transmission pipe is in transmission connection with the driving mechanism;

the outer side wall of the first wire tube is provided with external threads and is positioned in the transmission tube, the first wire tube can synchronously rotate with the transmission tube, the first wire tube and the transmission tube can relatively slide along the axial direction to generate displacement, the first wire tube is in threaded connection with a first transmission nut with limited circumferential rotation, and the first transmission nut is axially limited at the lower end of the transmission tube relative to the transmission tube;

the outer side wall of the second wire pipe is provided with external threads and is positioned in the first wire pipe, the second wire pipe can synchronously rotate with the first wire pipe, the second wire pipe and the first wire pipe can relatively slide along the axial direction to generate displacement, the second wire pipe is in threaded connection with a second transmission nut with limited circumferential rotation, and the second transmission nut is axially limited at the lower end of the first wire pipe relative to the first wire pipe;

the lead screw is positioned in the second lead screw pipe, a third transmission nut is connected to the inner wall of the lower end of the second lead screw pipe, the lead screw is in threaded connection with the third transmission nut, and the lower end of the lead screw is fixedly connected to the bottom plate.

2. A linear drive assembly as set forth in claim 1, wherein: the inner circular wall of the transmission pipe is provided with a plurality of first sliding grooves which extend along the axial direction of the transmission pipe and are distributed along the circumferential direction of the transmission pipe, the upper end of the first wire pipe is connected with a first sliding block, and the outer side wall of the first sliding block is provided with a first radial convex block which is correspondingly clamped with the first sliding grooves; the top of first transmission nut is equipped with the annular convex wall that upwards extends, annular convex wall be located between transmission pipe and the first silk pipe and can supply first slider to offset when first silk pipe is to keeping away from the transmission pipe direction removal.

3. A linear drive assembly as defined in claim 1, wherein: the inner circumferential wall of the first wire pipe is provided with a plurality of second sliding grooves which extend along the axial direction of the first wire pipe and are distributed along the circumferential direction of the first wire pipe, the upper end of the second wire pipe is connected with a second sliding block, and the outer side wall of the second sliding block is provided with a second radial convex block which is correspondingly clamped with the second sliding grooves.

4. A linear drive assembly as set forth in claim 1, wherein: the second transmission nut is connected with a bearing, and an inner ring of the bearing is connected to the outer side wall of the lower end of the first wire tube and used for enabling the first wire tube to be rotatably connected with the second transmission nut through the bearing and enabling the first wire tube and the second transmission nut to move synchronously along the axial direction.

5. A linear drive assembly as set forth in claim 1, wherein: the third transmission nut is sleeved with the connecting seat, and the third transmission nut can rotate circumferentially and is axially limited relative to the connecting seat.

6. A linear drive assembly as set forth in claim 5, wherein: the lower end of the third transmission nut is provided with an annular boss extending outwards in the radial direction; the limiting seat is connected in the connecting seat, an annular cavity is formed between the limiting seat and the connecting seat, and the annular boss is in clearance fit in the annular cavity.

7. The utility model provides an electric lift table leg, it includes from inside to outside suit in proper order and relative slip's first riser, second riser, third riser and fourth riser, with first riser upper end fixed connection's shell, the drive motor that sets up in the shell and the linear transmission assembly who is connected with the drive motor transmission, its characterized in that: the linear transmission assembly adopts the linear transmission assembly as claimed in any one of the claims 1 to 6; the outer side wall of a first transmission nut on the inner wall of the first vertical pipe is connected, the outer side wall of a second transmission nut on the inner wall of the second vertical pipe is connected, the outer side wall of a third transmission nut on the inner wall of the third vertical pipe is connected, and the lower end of a fourth vertical pipe is connected with the bottom plate.

8. The electric lifting table leg as claimed in claim 7, wherein: the upper end coaxial coupling of transmission pipe a drive shaft, the drive shaft on connect a worm wheel of being connected with the driving motor transmission, the drive shaft on be equipped with annular groove and worm wheel centre bore between the inner wall have the clearance.

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