Lifting table driven by single motor

Abstract

The utility model discloses a lifting table driven by a single motor, which comprises a support frame for fixing a table plate, the support frame is connected with the top ends of at least two table legs, and the lifting table further comprises the single motor for driving a screw rod to rotate so as to drive lifting pipes of inner and outer pipes of the table legs to ascend or descend through screw rod nuts; a worm is coaxially fixed to a shaft of a single motor fixed to the top end of a first lifting pipe of the first table leg, a worm gear meshed with the worm and the top end of a first lead screw of the first table leg are limited in the circumferential direction, and a driving chain wheel is coaxially limited to the top end of the first lead screw in the circumferential direction. An annular chain meshed with the driving chain wheel is meshed with a driven chain wheel which is circumferentially limited at the top end of a second screw rod of the second table leg; the worm, the worm gear, the driving chain wheel, the driven chain wheel and part of the annular chain meshed with the chain wheels are all contained in the containing space of the shell; the shell is detachably connected with the top end of the first lifting pipe. The driving structure is relatively simple and compact, relatively saves cost and is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of electric lifting tables, in particular to a lifting table driven by a single motor. Background Art

[0002] The single motor driven lifting table in the prior art generally has two table legs, and the support frame for fixing the table top is fixed to the top of the lifting tubes of the inner and outer tubes of the two table legs. The single motor installed in the middle of the support frame drives the respective screws to rotate through the transmission rod and the gear box at the top of the two columns, and drives the lifting tube to rise or fall through the screw nut.

[0003] However, the gear transmission structure of the above prior art has high requirements on gear manufacturing accuracy and installation accuracy, and its material cost and labor cost are relatively high.

[0004] Later, some technicians replaced the gear transmission with a sprocket chain transmission. A single motor drives the active sprocket, which is then transmitted to the first passive sprocket via the first chain and drives the screw of one table leg to rotate. The passive sprocket is then transmitted to the second passive sprocket via the second chain, and the second passive sprocket drives another screw of another table leg to rotate. Compared with the above-mentioned gear transmission structure, the requirements for its manufacturing accuracy and installation accuracy are relatively lower. However, the sprocket chain transmission structure still has the following shortcomings: the structure is relatively complex, the connection between the parts is relatively loose, the space occupied is relatively large, the material cost and labor cost are still relatively high, and the installation is still inconvenient. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a lifting table driven by a single motor which has a relatively simple and compact structure and is relatively cost-effective.

[0006] The technical solution of the utility model is to provide a lifting table driven by a single motor, including a support frame for fixing a table top, the support frame is connected to the top ends of at least two table legs, and also includes a single motor for driving a screw rod to rotate to drive the lifting tubes of the inner and outer tubes of each table leg to rise or fall through a screw rod nut; a worm is coaxially fixed to the shaft of the single motor fixed to the top end of the first lifting tube of the first table leg, a worm wheel meshing with the worm is circumferentially limited with the top end of the first screw rod of the first table leg, a driving sprocket is coaxially limited with the top end of the first screw rod, and an annular chain meshing with the driving sprocket is meshed with a passive sprocket circumferentially limited at the top end of the second screw rod of the second table leg.

[0007] After adopting the above structure, the lifting table driven by a single motor of the utility model has the following advantages: the manufacturing accuracy and installation accuracy are relatively lower than those of the gear transmission structure of the prior art. In particular, the worm wheel of the single motor output worm gear structure is coaxially connected with the driving sprocket and directly drives a lead screw, and synchronously drives another lead screw through the ring chain and the driven sprocket. Its structure is relatively simple, the connection between the parts is compact, the space occupied is relatively small, and the material cost and labor cost are relatively reduced, that is, relatively cost-saving.

[0008] Furthermore, the front end of the single motor is connected to a housing, and the worm, worm wheel, driving sprocket and part of the annular chain meshing with the driving sprocket are all accommodated in the housing space of the housing; the housing is detachably connected to the top of the first lifting tube. After adopting the above structure, the structure of the motor, i.e. the single motor, worm, worm wheel, driving sprocket chain is more compact and very convenient to install. In addition, due to the protection of the housing, the operating environment is cleaner, the driving part can run more smoothly and reliably, and its service life can be extended.

[0009] Furthermore, the housing includes a first housing detachably connected by a first upper half shell and a first lower half shell, and the driving sprocket and a portion of the annular chain meshing with the driving sprocket are accommodated in a first accommodation space formed by the first upper half shell and the first lower half shell; the first housing is detachably connected to the top of the first lifting tube. After adopting the above structure, the housing accommodating the driving sprocket and the meshed chain and the housing accommodating the worm and worm wheel are independently and detachably connected, making installation more convenient, and further ensuring a cleaner operating environment, making the driving part run more smoothly and reliably, and extending its service life.

[0010] Furthermore, the housing also includes a worm housing fixed to the front end of the single motor and detachably connected to the first housing and used to accommodate the worm, a worm housing barrel for accommodating the worm wheel, and a worm housing cover detachably connected to the top of the worm housing barrel. After adopting the above structure, the housing for accommodating the worm and worm wheel and the housing for accommodating the driving sprocket and the meshed chain are independently and detachably connected, making installation more convenient, and further ensuring a cleaner operating environment, making the driving part run more smoothly and reliably, and extending its service life.

[0011] Furthermore, a second outer shell is detachably fixed to the top of the second lifting tube of the second table leg, and the passive sprocket and a portion of the ring chain meshing with the passive sprocket are accommodated in a second accommodation space formed by the second upper half shell and the second lower half shell. With the above structure, installation is more convenient, and the operating environment is cleaner due to the protection of the second outer shell, so that the meshing operation of the passive sprocket and the ring chain is more stable and reliable, and its service life can be extended.

[0012] Furthermore, the two straight segments of the ring chain are provided with hard protective covers for the ring chains of the straight segments to slide inside, one end of the two hard protective covers is fixed in the first shell, and the other end of the two hard protective covers is fixed in the second shell. With the above structure, the operation environment is cleaner, the operation of the ring chain is more stable and reliable, and its service life can be extended. It also ensures that the ring chain will not hurt people or objects during operation. The structure also has a tensioning function, which can ensure that the ring chain is always in a tensioned state.

[0013] Furthermore, the ring chain is composed of a plurality of rigid hollow cylinders fixed at equal intervals on the ring rope, and the sprockets of the active sprocket and the passive sprocket are rectangular teeth, and a groove for engaging the rigid hollow cylinder is formed between two adjacent rectangular teeth. After adopting the above structure, the ring chain structure is simple and easy to manufacture, such as using a steel wire rope to penetrate a plurality of rigid plastic hollow cylinders such as dozens, hundreds or hundreds, and then welding the two ends of the steel wire rope, and then hot pressing and fixing the steel wire rope to the plurality of rigid plastic hollow cylinders arranged at equal intervals. The material and manufacturing costs are low, the operation is safe and reliable, maintenance-free and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model lifting table with the table top and the left supporting plate in the supporting frame omitted.

[0015] Figure 2 yes Figure 1 The three-dimensional structural diagram of the support frame is omitted.

[0016] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of A.

[0017] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of B.

[0018] Figure 5 yes Figure 2 Schematic diagram of the exploded structure of some parts of the sprocket chain transmission structure (the screws and other fasteners are not exploded; the following Figure 6 , Figure 7 , Figure 8 Same).

[0019] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of C in the figure.

[0020] Figure 7 yes Figure 5 Schematic diagram of the enlarged structure of D in the figure.

[0021] Figure 8 yes Figure 5 Schematic diagram of the enlarged structure of E.

[0022] As shown in the figure:

[0023] 1. Support and lifting structure, 11. Support frame, 12. Table legs, 121. First table legs, 122. Second table legs, 13. Base plate, 14. Lifting tube, 141. First lifting tube, 142. Second lifting tube, 15. Fixed tube, 16. Screw rod, 161. First screw rod, 162. Second screw rod;

[0024] 2. Motor and sprocket chain drive structure, 21. Single motor, 22. Worm, 23. Worm wheel, 24. Driving sprocket, 25. Ring chain, 251. Ring rope, 252. Rigid hollow cylinder, 26. First shell, 261. First upper shell, 262. First lower shell, 263. First accommodating space, 27. Worm shell; 28. Worm wheel shell, 281. Worm wheel shell cylinder, 282. Worm wheel shell cover, 29. Second shell, 291. Second upper shell, 292. Second lower shell, 293. Second accommodating space, 210. Passive sprocket, 211. Hard protective cover;

[0025] 3. Connect the blocks. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these specific implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each specific implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 shown.

[0028] The lifting table driven by a single motor of the utility model comprises a support frame 11 for fixing a table top, the support frame 11 is connected to the top of at least two table legs 12, and the bottom of each table leg 12 is connected to a foot plate 13. The lifting table driven by a single motor of the utility model also comprises a single motor 21 for driving a screw rod 16 to rotate so as to drive the lifting tubes 14 of the inner and outer tubes of the respective table legs 12 to rise or fall through the screw rod nut. The inner and outer tubes are also called inner and outer outer tubes, such as Figure 1 The upper part shown in FIG. 1 is a lifting pipe 14, and the lower part is a fixing pipe 15. The above can be collectively referred to as a support and lifting structure 1.

[0029] The single motor 21 is a motor or a set of motors or an electric motor. The table top is fixed to the support frame 11, such as by passing through multiple screw holes on the top plate of the support frame 11 and tightening them into the threaded holes on the bottom surface of the table top. The support frame 11 is connected to the top of the table leg 12 by passing through multiple screw holes on the bottom plate of the support frame 11 and tightening them into the threaded holes on the top of the lifting tube 14 of the table leg 12.

[0030] The screw rod 16 rotates to drive the lifting tubes 14 of the inner and outer tubes of the respective table legs 12 to rise or fall through the screw rod nut, which is a prior art and will not be described in detail here.

[0031] The inventive point of the utility model is to adopt the following sprocket chain transmission structure or motor and sprocket chain driving structure 2.

[0032] A worm 22 is coaxially fixed to the axis of the single motor 21 fixed to the top of the first lifting tube 141 of the first table leg 121, and a worm wheel 23 meshing with the worm 22 is circumferentially limited to the top of the first screw rod 161 of the first table leg 121. A driving sprocket 24 is coaxially circumferentially limited to the top of the first screw rod 161, and an annular chain 25 meshing with the driving sprocket 24 is meshed with a passive sprocket 210 circumferentially limited to the top of the second screw rod 162 of the second table leg 122.

[0033] The front end of the single motor 21 is connected to a housing, and the worm 22, the worm wheel 23, the driving sprocket 24 and a portion of the ring chain 25 meshing with the driving sprocket 24 are all accommodated in the housing space of the housing. The housing is detachably connected to the top end of the first lifting tube 141.

[0034] The housing includes a first housing 26 detachably connected by a first upper half shell 261 and a first lower half shell 262. The driving sprocket 24 and a portion of the annular chain 25 meshing with the driving sprocket 24 are accommodated in a first accommodation space 263 formed by the first upper half shell 261 and the first lower half shell 262. The first housing 26 is detachably connected to the top end of the first lifting tube 141.

[0035] The housing also includes a worm housing 27 fixed to the single motor 21 or the front end of the motor and detachably connected or detachably fixed to the first housing 26 and used to accommodate the worm 22, a worm housing barrel 281 for accommodating the worm 23, and a worm housing cover 282 detachably connected to the top of the worm housing barrel 281. The worm housing barrel 281 and the worm housing cover 282 are collectively referred to as a worm housing 28.

[0036] A second outer shell 29 is detachably fixed to the top end of the second lifting tube 142 of the second table leg 122 , and the driven sprocket 210 and a portion of the annular chain 25 meshing with the driven sprocket 210 are accommodated in a second accommodation space 293 formed by a second upper half shell 291 and a second lower half shell 292 .

[0037] The two straight segments of the ring chain 25 are provided with hard protective covers 211 for the straight segments of the ring chain 25 to slide inside. One end of the two hard protective covers 211 is fixed in the first outer shell 26, and the other end of the two hard protective covers 211 is fixed in the second outer shell 29. The fixing described here is such as one end of the two hard protective covers 211 is pressed by the first upper half shell 261 and the first lower half shell 262; another example is such as the other end of the two hard protective covers 211 is pressed by the second upper half shell 291 and the second lower half shell 292. The hard protective cover 211 can also be called a rigid protective cover or a rigid protective tube or a rigid protective tube such as a steel tube.

[0038] It is easy to understand that the endless chain 25 and the driving sprocket 24 and the driven sprocket 210 at both ends are located on the same horizontal plane.

[0039] The above-mentioned detachable fixing can adopt a structure in which screws pass through the respective screw holes one by one and are then tightened in the respective threaded holes.

[0040] The circumferential limit described above can all adopt the structure of a regular hexagonal column and a regular hexagonal hole fitting together. For example, if the upper end of the first screw rod 161 is a regular hexagonal column, the center hole of the worm wheel and the center hole of the active sprocket are both regular hexagonal holes fitting together with the regular hexagonal column. If the upper end of the second screw rod 162 is a regular hexagonal column, the center hole of the passive sprocket is a regular hexagonal hole fitting together with the regular hexagonal column. After adopting the above structure, the firmness of the connection between the worm wheel 23, the active sprocket 24 and the first screw rod 161, and the passive sprocket 210 and the second screw rod 162, as well as the stability, reliability and synchronization of the transmission are further guaranteed.

[0041] The shaft of the above single motor 21 or motor and the worm 22 can be formed into a coaxial whole at one time. The first lower half shell 262 can be screwed to the top of the first lifting tube 141 of the first table leg 121 through screws, screw holes and threaded holes. The second lower half shell 292 can be screwed to the top of the second lifting tube 142 of the second table leg 122 through screws, screw holes and threaded holes. The detachable connection between the top of the first lifting tube 141 and the first shell 26 as described above can be detachably connected by a connecting block 3 and screws. The detachable connection between the top of the second lifting tube 142 and the second shell 29 as described above can also be detachably connected by a connecting block 3 and screws. The first lower half shell 262 of the first shell 26 and the second lower half shell 292 of the second shell 29 can be screwed to the connecting block 3 through multiple screws and multiple screw holes corresponding to each other and multiple threaded holes respectively, and the connecting block 3 can be screwed to the top of the first lifting tube 141 and the top of the second lifting tube 142 respectively through multiple screws and multiple screw holes corresponding to each other and multiple threaded holes. Then, the regular hexagonal center hole of the driving sprocket 24 is fitted on the regular hexagonal column at the upper end of the first screw rod 161, and after the ring chain 25 is meshed with the driving sprocket 24 and the passive sprocket 210, the regular hexagonal center hole of the passive sprocket 210 is fitted on the regular hexagonal column at the upper end of the second screw rod 162, and then the first upper half shell 261 and the first lower half shell 262 are screwed one by one using screws, screw holes and threaded holes. Then, the second upper half shell 291 and the second lower half shell 292 are screwed one by one using screws, screw holes and threaded holes. Then, the worm gear shell tube 281 of the worm gear shell 28 connected to the front end of the motor or single motor 21 is screwed to the first outer shell 26 through a one-to-one correspondence of multiple screws, screw holes and threaded holes, and then the regular hexagonal center hole of the worm gear located above the first outer shell 26 is fitted on the regular hexagonal column at the upper end of the first screw rod 161, and then the worm gear shell cover 282 is screwed to the worm gear shell tube 281 through a one-to-one correspondence of multiple screws, screw holes and threaded holes.

[0042] The plurality of screws and the corresponding plurality of screw through holes and the plurality of threaded holes mentioned above may be 2, 3, 4 or the like in number.

[0043] The annular chain 25 may be composed of a plurality of rigid hollow cylinders 252 fixed at equal intervals on an annular rope 251 such as an annular steel wire rope. The sprocket teeth of the active sprocket 24 and the passive sprocket 210 may be rectangular teeth, and a groove for engaging the rigid hollow cylinder 252 is formed between two adjacent rectangular teeth.

[0044] The ring chain 25 can be made by inserting a steel wire rope into a plurality of rigid hollow cylinders 252, such as tens, hundreds or hundreds of rigid plastic hollow cylinders, welding the two ends of the steel wire rope, and then hot pressing and fixing the steel wire rope to a plurality of rigid plastic hollow cylinders arranged at equal intervals. Each rigid hollow cylinder 252 or rigid hollow cylinder can also be called a chain bead. The ring chain 25 can also be called a ring transmission chain. The number of rigid hollow cylinders 252 or chain beads on the annular chain 25 or annular transmission chain can be in a multiple relationship with the number of teeth of the driving sprocket 24. The number of rigid hollow cylinders 252 or chain beads on the annular chain 25 or annular transmission chain can be in a multiple relationship with the number of teeth of the passive sprocket 210. For example, the number of chain beads is 2 times, 3 times, 4 times, etc., of the number of teeth of the driving sprocket 24, and the number of chain beads is also 2 times, 3 times, 4 times, etc., of the number of teeth of the passive sprocket 210, so as to make the transmission more flexible, stable and reliable.

[0045] The at least two table legs 12 mentioned above are generally two table legs 12. However, it is not difficult to understand that if there are three table legs, the sprocket chain transmission structure or the motor and sprocket chain driving structure mentioned above can also be adopted, such as a first transmission sprocket is coaxially arranged at the top of the second screw rod, and then the second driven sprocket on the third screw rod of the third leg is transmitted through another ring chain. If there are four table legs, the sprocket chain transmission structure or the motor and sprocket chain driving structure mentioned above can also be adopted, such as on the basis of the first transmission sprocket, the second driven sprocket and the third driven wheel are coaxially arranged on the first screw rod, and then the fourth screw rod is transmitted through another ring chain.

[0046] The above unmarked parts, structures or quantities are not shown in the drawings. The drawings are for illustration only. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.

[0047] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lifting table driven by a single motor, comprising a support frame for fixing a table top, the support frame being connected to the top ends of at least two table legs, and a single motor for driving a screw rod to rotate so as to drive the lifting tubes of the inner and outer tubes of the respective table legs to rise or fall through the screw rod nut; characterized in that: A worm is coaxially fixed to the shaft of a single motor fixed to the top end of the first lifting tube of the first table leg, a worm wheel meshing with the worm is circumferentially limited to the top end of the first screw rod of the first table leg, a driving sprocket is coaxially circumferentially limited to the top end of the first screw rod, and an annular chain meshing with the driving sprocket is meshed with a passive sprocket circumferentially limited to the top end of the second screw rod of the second table leg.

2. The single-motor driven lifting table according to claim 1, characterized in that: The front end of the single motor is connected with a housing, and the worm, worm wheel, driving sprocket and part of the annular chain meshing with the driving sprocket are all accommodated in the housing space of the housing; the housing is detachably connected to the top end of the first lifting tube.

3. The single-motor driven lifting table according to claim 2, characterized in that: The shell includes a first shell detachably connected by a first upper half shell and a first lower half shell, and the driving sprocket and a part of the annular chain meshing with the driving sprocket are accommodated in a first accommodating space formed by the first upper half shell and the first lower half shell; the first shell is detachably connected to the top end of the first lifting tube.

4. The single-motor driven lifting table according to claim 3, characterized in that: The housing also includes a worm housing fixed to the front end of the single motor and detachably connected to the first housing and used to accommodate the worm, a worm housing barrel used to accommodate the worm wheel, and a worm housing cover detachably connected to the top of the worm housing barrel.

5. The single-motor driven lifting table according to claim 2, characterized in that: A second outer shell is detachably fixed to the top end of the second lifting tube of the second table leg, and the passive sprocket and a portion of the annular chain meshing with the passive sprocket are accommodated in a second accommodation space formed by the second upper half shell and the second lower half shell.

6. The single-motor driven lifting table according to claim 5, characterized in that: The two straight segments of the ring chain are provided with hard protective covers for the ring chains of the straight segments to slide inside. One end of the two hard protective covers is fixed in the first shell, and the other end of the two hard protective covers is fixed in the second shell.

7. The single motor driven lifting table according to any one of claims 1, 2, 5 or 6, characterized in that: The ring chain is composed of a plurality of rigid hollow cylinders fixed at equal intervals on the ring rope. The sprockets of the driving sprocket and the driven sprocket are rectangular teeth, and grooves for engaging the rigid hollow cylinders are formed between two adjacent rectangular teeth.

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