CN109704228B - Double-lead-screw lifting mechanism - Google Patents
Double-lead-screw lifting mechanism Download PDFInfo
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- CN109704228B CN109704228B CN201811527963.1A CN201811527963A CN109704228B CN 109704228 B CN109704228 B CN 109704228B CN 201811527963 A CN201811527963 A CN 201811527963A CN 109704228 B CN109704228 B CN 109704228B
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Abstract
The application discloses two lead screw elevating system, this two lead screw elevating system can steadily go up and down in the vertical direction, and the elevating platform has higher repeated positioning accuracy simultaneously, and the levelness of two lead screw elevating platforms keeps unchangeable when receiving pretightning force or bearing change. The double-screw lifting mechanism is used for stably lifting the long crystal furnace in the vertical direction after the lower cover bears the furnace burden, and simultaneously ensures that the borne furnace burden and the furnace body have high repeated positioning accuracy such as concentricity and the like; the levelness of the lower cover of the crystal growth furnace body placed on the lifting platform of the double-lead-screw lifting mechanism is kept unchanged when the lower cover is subjected to pretightening force or bearing change.
Description
Technical Field
The application relates to a double lead screw elevating system, concretely relates to double lead screw elevating system for growing brilliant stove belongs to mechanical electrical technology field.
Background
The existing crystal growth furnace uses a single-side screw rod to ascend along the vertical direction after a lower cover bears furnace burden. The single-side screw rod provides power for price lifting, the lower cover bearing only can use a cantilever supporting mode, and when the stress changes, the deformation is large, and the repeated positioning precision is poor; the lower cover supported by the cantilever at one side can be greatly inclined in the processes of gravity change and pretightening force change, so that the material filling precision is influenced.
Disclosure of Invention
In order to solve the problem, the application provides a double-screw lifting mechanism, and this lifting mechanism can make lifting platform of lifting mechanism can steadily go up and down in the vertical direction, guarantees the repeated positioning accuracy such as higher concentricity, and the levelness of lifting platform keeps unchangeable when receiving pretightning force or bearing change.
According to an aspect of the present application, there is provided a double screw lifting mechanism, comprising:
positioning a plate;
the positioning frame is positioned above the positioning plate;
the lifting platform is arranged between the positioning frame and the positioning plate;
at least one pair of lead screws, including a first lead screw and a second lead screw; the first lead screw and the second lead screw are movably connected with the positioning frame and the positioning plate, and are in screw transmission fit with the lifting platform;
a rotary driving assembly is arranged on the positioning plate or the positioning frame and comprises at least one driving shaft, a first synchronous transmission mechanism is arranged between the driving shaft and the first lead screw, and a second synchronous transmission mechanism is arranged between the first lead screw and the second lead screw;
at least one tensioning assembly for tensioning the second synchronous drive.
Optionally, the end of the lead screw is respectively connected with the positioning frame and the positioning plate in a rotating manner, and the lead screw at least comprises a first lead screw and a second lead screw which are arranged in parallel.
Optionally, the rotation driving assembly is arranged at the bottom of the positioning plate, and the tensioning assembly is fixed at the bottom of the positioning plate.
Optionally, the first synchronous drive comprises a chain, belt or gear drive; the second synchronous transmission mechanism comprises a chain type synchronous transmission mechanism or a belt type transmission mechanism.
Optionally, the second synchronous transmission mechanism includes a first synchronous pulley disposed on the first screw rod, a second synchronous pulley disposed on the second screw rod, and a second synchronous belt connecting the first synchronous pulley and the second synchronous pulley; the tensioning assembly is used for tensioning the second synchronous belt.
Optionally, the conveying direction of the second synchronous belt passing through the tensioning assembly is unchanged.
Optionally, the tensioning assembly comprises: the tensioning synchronous belt pulley and the tensioning belt pulley mounting plate are tensioned, and a strip-shaped mounting hole for fixing the tensioning belt pulley on the positioning plate is formed in the tensioning belt pulley mounting plate;
the included angle between the long axis of the strip-shaped mounting hole and the connecting line of the first lead screw and the second lead screw is α, and the included angle is more than 0 degree and less than α degrees and less than or equal to 90 degrees;
the second synchronous belt is connected with the first synchronous belt wheel, the tensioning synchronous belt wheel and the second synchronous belt wheel.
Furthermore, the tensioning synchronous belt wheel is fixedly arranged on the tensioning belt wheel mounting plate, and the tensioning belt wheel mounting plate and the rotary driving assembly are fixed on the same positioning frame or the same positioning plate.
Optionally, the strip mounting holes comprise at least a first strip mounting hole and a second strip mounting hole of non-connected common-axis. Further, the tensioning synchronous pulley mounting plate is fixedly connected with the tensioning synchronous pulley through four fixed positions.
Optionally, the tensioning assembly further comprises a guide wheel;
the second synchronous belt is connected with the first synchronous belt wheel, the guide wheel, the tensioning synchronous belt wheel and the second synchronous belt wheel, and the guide wheel is used for adjusting the conveying direction of the second synchronous belt leading-in and/or leading-out of the tensioning synchronous belt wheel.
Further, the guide wheel is fixed at the bottom of the positioning plate;
the guide wheel limits a second synchronous belt connected with the tensioning synchronous belt wheel in a downward projection area of the positioning plate.
Optionally, the guide wheels include a first guide wheel and a second guide wheel, and the second synchronous belt is sequentially connected with the first guide wheel, the tensioning synchronous pulley and the second guide wheel;
the conveying directions of the second synchronous belt passing through the first guide wheel, the tensioning synchronous belt wheel and the second guide wheel are approximately the same.
Further, the connecting line of the first guide wheel and the second guide wheel is approximately parallel to the connecting line of the first lead screw and the second lead screw.
Optionally, the parallel lead screw elevating system still includes the tight subassembly in top, the tight subassembly in top acts on the tensioning subassembly provides the tensioning for the second synchrodrive mechanism.
Optionally, the rotary drive assembly includes a servo motor and a speed reducer, an output shaft of the servo motor is connected to the speed reducer, and an output shaft of the speed reducer is the driving shaft.
Optionally, the rotation driving assembly is fixed on the positioning plate or the positioning frame through a driving mounting adjustment seat, the driving mounting adjustment seat is of a cavity structure, and the driving shaft and the first synchronous transmission mechanism are arranged in a cavity of the driving mounting adjustment seat.
Optionally, the lifting platform comprises a lifting platform main body and a lifting platform auxiliary support frame, the first end of the lifting platform main body is fixedly connected with the first lead screw, the first end of the lifting platform auxiliary support frame is fixedly connected with the second lead screw, and the second end of the lifting platform main body is close to the first end of the lifting platform auxiliary support frame and is supported by the lifting platform auxiliary support frame. The split structure of the lifting platform is convenient to disassemble and assemble and high in accuracy.
Optionally, the double-screw lifting mechanism further comprises at least two pairs of guide rods which penetrate through the lifting platform and are parallel to the first screw rod and the second screw rod and are symmetrically arranged with respect to the center of the lifting platform, and two ends of each guide rod are respectively arranged on the positioning plate and the positioning frame;
the guide rod is connected with the lifting platform through a box-type sliding block;
the locating rack is of a clip structure, and the lead screw is a ball screw or is provided with trapezoidal threads.
Optionally, the tensioning synchronous pulley is fixed to the tensioning pulley mounting plate by a tensioning synchronous pulley mounting shaft. The guide wheel comprises a rotary sleeve and a deep groove ball bearing.
Optionally, the second synchronous transmission comprises a conveyor belt or a conveyor chain.
When the double-screw lifting mechanism is used for a crystal growth furnace, the double-screw lifting mechanism is used for lifting and placing a crystal growth furnace body lower cover on the lifting platform to bear furnace burden, so that the crystal growth furnace body lower cover can stably lift in the vertical direction after bearing the furnace burden, the higher repeated positioning precision of the concentricity of the crystal growth furnace body lower cover bearing the furnace burden and the furnace body is ensured, and the levelness of the crystal growth furnace body lower cover is kept unchanged when the crystal growth furnace body lower cover is subjected to pretightening force or bearing change.
Benefits that can be produced by the present application include, but are not limited to:
1) the application provides a parallel feed screw elevating system can steadily go up and down in the vertical direction, and the elevating platform has higher repeated positioning accuracy simultaneously, and the levelness of parallel feed screw elevating platform keeps unchangeable when receiving pretightning force or bearing change.
2) The double-screw lifting mechanism can stably run, the lifting platform can be always kept in a horizontal state, and the position of a bearing object on the lifting platform is ensured not to deviate; the lifting platform is still kept in a horizontal state under the action of gravity or pre-tightening force between the lifting platform and the upper flange.
3) The utility model provides a double-screw lifting mechanism can steadily go up and down in the vertical direction after being used for long brilliant stove to bear the weight of the furnace burden under bearing, guarantees simultaneously that the lid bears the weight of the furnace burden and the furnace body has higher repeated positioning accuracy such as concentricity, places the levelness of the brilliant stove lower cover of length at the elevating platform and keeps unchangeable when receiving pretightning force or bearing change.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic perspective view of a double screw lifting mechanism according to an embodiment of the present application;
fig. 2 is a schematic bottom perspective view of a double screw lifting mechanism according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a drive mount adjustment block according to an embodiment of the present application;
FIG. 4 is a bottom perspective view of the dual screw lift mechanism of FIG. 2 with the cover removed;
FIG. 5 is a schematic top view of a portion of the positioning plate according to an embodiment of the present disclosure without a lead screw and a guide rod;
fig. 6 is a schematic view of a tensioning pulley mounting plate according to an embodiment of the present application;
FIG. 7 is a schematic view of a positioning plate according to an embodiment of the present disclosure;
FIG. 8 is a schematic view of a main body of an elevator according to an embodiment of the present disclosure;
fig. 9 is a schematic view of an auxiliary support of an elevator platform according to an embodiment of the present application.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those specifically described and thus the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, references to the description of "one embodiment," "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The double-screw lifting mechanism can be used in any application needing lifting, can be used independently or used as auxiliary equipment of other equipment, and can be arranged below a crystal growth furnace for lifting crystal growth raw materials (furnace materials) to a crystal growth fixing position in the crystal growth furnace. The charging process of the crystal growth furnace comprises the steps of placing a lower cover of the crystal growth furnace on a lifting platform, accurately charging and placing furnace burden on the lower cover, and lifting the lower cover and the furnace burden to a crystal growth fixing position of the crystal growth furnace by a double-screw lifting mechanism to stop. The concentricity of the furnace burden and the crystal growth furnace, the repeated positioning precision of the furnace burden, the stable filling precision of the furnace burden and the like have great influence on the quality of the prepared crystal. In order to ensure the quality of the prepared crystals, the accurate concentricity and the like of the furnace burden and the crystal growth furnace are required to be ensured not to change in the lifting process, and a double-screw lifting mechanism is required to lift stably.
This application can steadily go up and down in the vertical direction for improving parallel feed screw elevating system, guarantees the repeated positioning accuracy of higher elevating platform simultaneously, and the levelness of parallel feed screw elevating platform keeps unchangeable when receiving pretightning force or bearing change.
Referring to fig. 1 to 9, fig. 1 is a schematic perspective view of a double-screw lifting mechanism according to an embodiment of the present disclosure; fig. 2 is a schematic bottom perspective view of a double screw lifting mechanism according to an embodiment of the present disclosure; FIG. 3 is a schematic view of a drive mount adjustment block according to an embodiment of the present application; FIG. 4 is a bottom perspective view of the dual screw lift mechanism of FIG. 2 with the cover removed; FIG. 5 is a schematic top view of a portion of the positioning plate according to an embodiment of the present disclosure without a lead screw and a guide rod; fig. 6 is a schematic view of a tensioning pulley mounting plate according to an embodiment of the present application; FIG. 7 is a schematic view of a positioning plate according to an embodiment of the present disclosure; FIG. 8 is a schematic view of a main body of an elevator according to an embodiment of the present disclosure; fig. 9 is a schematic view of an auxiliary support of an elevator platform according to an embodiment of the present application.
Referring to fig. 1 and 2, an embodiment of the present application discloses a double screw lifting mechanism including: locating plate 2, locating rack 4, elevating platform 6 and lead screw 8. The locating rack 4 is positioned above the locating plate 2, and the lifting platform 6 is arranged between the locating rack 4 and the locating plate 2. The upper end of the screw rod 8 is rotationally connected with the positioning frame 4, and the lower end of the screw rod 8 is rotationally connected with the positioning plate 2. The lead screw 8 includes a first lead screw 82 and a second lead screw 84 arranged in parallel. The first lead screw 82 and the second lead screw 84 are screw-drive-fitted to the elevating table 6.
Referring to fig. 1 and 2, the rotational drive assembly 10 may be disposed on the top of the spacer 4 or the bottom of the spacer 2. In fig. 2, the rotation driving assembly 10 disposed at the bottom of the positioning plate 2 is rotatably provided with a driving shaft, a first synchronous transmission mechanism 12 is disposed between the driving shaft and the first lead screw 82, and a second synchronous transmission mechanism 14 is disposed between the first lead screw 82 and the second lead screw 84. A tensioning assembly 16 is provided, the tensioning assembly 16 being used to tension the second synchronous drive 14, the tensioning assembly 16 being fixed to the bottom of the positioning plate 2. The tensioning assembly 16 and the second synchronous drive 14 are at least partially disposed within the cavity formed by the cover 22 and the positioning plate 2.
The number of the screw rods 8 can be two or more, the screw rods 8 are arranged in parallel, and the lifting table 6 can be lifted stably. The screw rod 8 is respectively connected with the positioning plate 2 and the positioning frame 4 through a bearing seat. In one embodiment, the screw 8 is a ball screw having a thread groove and a nut screw drive with a corresponding protruding ball; the screw 8 can also be in screw transmission fit with the nut through a trapezoidal thread structure, and the thread structure can also achieve the same transmission effect.
In one embodiment, the positioning frame 4 is a clip structure, which can reduce the weight of the double-screw lifting mechanism and maintain the stability and deformation resistance of the lifting mechanism.
In one embodiment, a nut, which mates with lead screw 8, is fixedly connected to lift table 6 via connection plate 62. Preferably, the nut is connected with the connecting plate 62 through a thread, the threaded hole on the connecting plate 62 is a long strip shape extending along the axial direction of the screw rod, and the shape of the threaded hole is set to finely adjust the levelness of the lifting table 6, so that the lifting table 6 is ensured to be kept horizontal. The output shaft of the rotary driving assembly 10 can rotate forwards and backwards to realize the lifting motion of the lifting platform 6 driven by the rotation of the lead screw. Because the driving shaft of the rotation driving assembly 10 drives the first lead screw 82 to rotate through the first synchronous transmission mechanism 12, the rotation of the first lead screw 82 is transmitted to the second lead screw 84 through the second synchronous transmission mechanism 14 to rotate, the second synchronous transmission mechanism 14 enables the first lead screw 82 and the second lead screw 84 to rotate simultaneously, and the tensioning component 16 acting on the second synchronous transmission mechanism 14 enables the first lead screw 82 and the second lead screw 84 to rotate more accurately and synchronously, so that the double-lead-screw lifting mechanism can lift stably in the vertical direction, meanwhile, the high repeated positioning precision of the lifting table 6 is ensured, and the levelness of the lifting table 6 is kept unchanged when being subjected to pretightening force or bearing change.
It will be appreciated by those skilled in the art that the rotary drive assembly 10 may be any device that provides rotary drive, such as a rotary hydraulic cylinder, a hydraulically powered progressive cavity pump, and the like. A preferred embodiment is that the rotary driving assembly 10 includes a servo motor and a speed reducer, an output shaft of the servo motor is connected to the speed reducer, an output shaft of the speed reducer is a driving shaft, the driving shaft drives the first lead screw 82 to rotate through the first transmission mechanism 12, and the first transmission mechanism 12 may be a coupling, preferably a quincunx coupling. Further, the servo motor is a band-type brake servo motor.
Referring to fig. 2, the rotation driving assembly 10 is fixed at the bottom of the positioning plate 2 by a driving mounting adjustment seat 106, the driving mounting adjustment seat 106 is a cavity structure, and the driving shaft and the first synchronous transmission mechanism 12 are disposed in a cavity of the driving mounting adjustment seat 106. The drive adjustment base 106 is rotatably mounted to the positioning plate 2 by a drive assembly 10, such as a servo reducer. Referring to fig. 3, the driving adjustment seat 106 is fixedly connected to the rotary driving assembly 10 and the positioning plate 2 through a first elongated fixing hole 1062 and a second elongated fixing hole 1064, respectively, and can adjust the coaxiality between the driving shaft and the screw shaft through the first elongated fixing hole 1062 and the second elongated fixing hole 1064 along two directions of the horizontal plane X, Y.
Referring to fig. 1 and 2, in order to ensure the smooth operation of the dual-screw lifting mechanism, the dual-screw lifting mechanism further includes a guide rod 18, the guide rod 18 passes through the lifting platform 6 and is parallel to the first screw 82 and the second screw 84, one end of the guide rod 18 is connected to the positioning plate 2, and the other end of the guide rod 18 is connected to the positioning frame 4. The guide rods 18 are in sliding fit with the lifting platform 6, further, the lifting platform 6 slides up and down along the guide rods 18 through box-type sliding blocks, and the lifting platform 6 slides more stably under the action of the 4 guide rods.
Referring to fig. 1 and 2, as an embodiment, the guide bars 18 include a first pair of guide bars disposed in parallel with a first lead screw 82 as a symmetrical center and a second pair of guide bars disposed in parallel with a second lead screw 84 as a symmetrical center. Each pair of guide rods is fixedly installed with the positioning frame 4 through the upper guide rod installation seat 182 and is fixedly connected with the positioning plate 2 through the lower guide rod installation seat 184. The guide bar upper mounting seat 182 comprises a guide bar upper mounting plate, guide bar upper positioning grooves symmetrically arranged and a middle screw rod upper fixing part, wherein the guide bar upper positioning grooves are hollow cylinders protruding out of the upper mounting plate plane. The guide rod lower mounting base 184 comprises a guide rod lower mounting plate, guide rod lower positioning holes which are symmetrically arranged, and a screw rod lower fixing part which is positioned in the middle, wherein the lower positioning holes are round holes in the lower mounting plate. The guide bar 18 is rotatable within the upper and lower positioning slots. The cooperation of the upper guide bar mounting seat 182 and the lower guide bar mounting seat 184 makes the guide bar 18 more robust and able to withstand greater weight forces without deformation.
Referring to fig. 2, as an embodiment, the screw 8 has a thread groove and is in screw transmission with a nut having a corresponding protruding ball, the nut and the slider on the same side of the dual screw lifting structure are fixed on a connecting plate 62 connected to the end of the lifting platform 6, so as to connect the screw 8, the guide rod 18 and the lifting platform 6, and the connecting plate 62 is arranged to make the dual screw lifting structure not easy to deform. The screw 8 can also be in screw transmission fit with the nut through a trapezoidal thread structure, and the thread structure can also achieve the same transmission effect.
Referring to fig. 4 and 5, the second synchronous transmission mechanism 14 includes a first synchronous pulley 142 disposed on the first lead screw 82, a second synchronous pulley 144 disposed on the second lead screw 84, and a second synchronous belt 146 connecting the first synchronous pulley 142 and the second synchronous pulley 144, the tension assembly 16 includes a tension synchronous pulley 162 and a tension pulley mounting plate 164, a bar-shaped mounting hole 1642 for fixing the tension pulley 162 on the positioning plate 2 is disposed on the tension pulley mounting plate 164, a long axis of the bar-shaped mounting hole 1642 forms an included angle α with a connecting line between the first lead screw 82 and the second lead screw 84, and 0 < α < 90 °, further 70 < α < 90 °, the second synchronous belt 146 connects the first synchronous pulley 142, the tension synchronous pulley 162 and the second synchronous pulley 144, the tension applied to the second synchronous belt 146 is adjusted by adjusting the position where the tension pulley 162 is mounted on the bar-shaped mounting hole 1642, so that the first lead screw 82 and the second lead screw 84 maintain accurate synchronous motion.
Referring to fig. 5, the strip mounting hole 1642 includes first and second strip mounting holes of non-connected common axis. Tensioning band pulley mounting panel 164 is fixed through four bar mounting holes with locating plate 2, more firm fixes tensioning band pulley mounting panel 164 on locating plate 2. Through the relative position between the screw hole of adjustment locating plate 2 and bar mounting hole 1642, just can adjust the extension length of tensioning band pulley mounting panel 164 on locating plate 2, and then drive synchronous pulley 162 and stretch out, realize the tensioning of second hold-in range 146. In order to prevent the tension pulley mounting plate 164 from sliding relative to the positioning plate 2, a tightening assembly is fixed on the positioning plate 2, and the tightening assembly comprises a tightening block 165, a tightening bolt 166 and a lock nut 167. The jacking block 165 is used for installing a jacking bolt 166, the jacking bolt 166 pushes the tensioning pulley mounting plate 164 to strengthen the tensioning force of the second synchronous belt 146, and the locking nut 167 is used for locking the jacking bolt 166 after adjustment to prevent reverse sliding.
Referring to fig. 6, the tension pulley mounting plate 164 is further provided with a stop plate 1644 perpendicular to the plane of the tension pulley mounting plate and a tension synchronous pulley mounting hole 1646 for fixing the tension synchronous pulley 162. The jacking bolts 166 may abut against the stop plate 1644 for tensioning the second timing belt 146. Referring to fig. 7, the positioning plate 2 is provided with an opening 24 at a position for fixing the tension pulley mounting plate 164, and the opening 24 not only enables the tension pulley 162 to act on the second timing belt 144 with a wide variation range, but also enables the structure of the whole double-screw lifting mechanism to be more compact.
Referring to fig. 4, the tension assembly 16 further includes a idler pulley 19, and a second timing belt 146 connects the first timing pulley 142, the idler pulley 19, the tension timing pulley 162, and the second timing pulley 144. The guide wheel 19 may be disposed at a position where the second timing belt 146 is guided into and/or out of the tension timing pulley 162, and the guide wheel 19 may not only adjust the conveying direction of the second timing belt 146, such as limiting the second timing belt 146 within a downward projection area of the positioning plate 2. The guide wheel 19 is arranged to increase the tension of the tensioning synchronous pulley 162 at the same position on the second synchronous belt 146, and the moving distance of the tensioning synchronous pulley 162 along the strip-shaped mounting hole 1642 is reduced, so that the whole double-screw lifting mechanism is more compact.
Referring to fig. 4, as a preferred embodiment, the guide wheel 19 includes a first guide wheel and a second guide wheel, and a connecting line of the first guide wheel and the second guide wheel is substantially parallel to a connecting line of the first lead screw 82 and the second lead screw 84; the second timing belt 146 is connected to the first timing pulley 142, the first guide pulley, the tension timing pulley 162, the second guide pulley, and the second timing pulley 144 in sequence.
As an embodiment, the tensioned synchronous pulley 162 is fixed to the tensioned pulley mounting plate 164 by a tensioned synchronous pulley mounting shaft, and the guide wheel 19 includes a rotating sleeve that is rotated using a deep groove ball bearing.
Referring to fig. 1, the lifting platform 6 includes a lifting platform main body 64 and a lifting platform auxiliary support frame 66, a first end of the lifting platform main body 64 is fixedly connected to a first lead screw 82, a first end of the lifting platform auxiliary support frame 66 is fixedly connected to a second lead screw 84, and a second end of the lifting platform main body 64 is supported by the lifting platform auxiliary support frame 66. The second end of the elevator table body 64 is adjacent the second lead screw 84. The split structure of the lifting platform 6 is convenient to disassemble and assemble and high in accuracy.
Referring to fig. 8 and 9, as an embodiment, a first end of the lifting platform main body 64 is vertically fixed to the connecting plate 62 connected to the first lead screw 82, and at least one supporting plate 68 is provided to be perpendicular to the lifting platform main body 64 and the connecting plate 62, respectively, and the supporting plate 68 is used for supporting the lifting platform main body 64 to be stable and not easy to deform. The second end of the lift table main body 64 is supported by a lift table auxiliary support bracket 66.
As an embodiment, the lifting process of the double-screw lifting mechanism is as follows:
firstly, a servo motor drives a speed reducer to be installed on a driving installation adjusting seat to provide ascending and descending power for the whole double-screw lifting mechanism;
the speed reducer drives the ball screws to rotate, and meanwhile, the first driven synchronous belt pulley and the second transmission belt transmit power to the ball screws with the same other side, so that the two ball screws rotate simultaneously, the ball screw nut converts the rotary motion of the screw screws into linear motion through the ball screw nut mounting seat and the sliding block ball screw nut connecting plate, and drives the lifting platform to complete ascending and descending actions;
thirdly, the box-type sliding block and the light bar provide auxiliary parallel action for the mechanism;
and fourthly, the tensioning belt wheel mounting plate, the tensioning synchronous belt wheel mounting shaft and the tensioning synchronous belt wheel provide tensioning pre-tightening force for the synchronous belt wheel, and two screw shafts are ensured to rotate simultaneously.
The double-screw lifting mechanism of the embodiment is used for stably lifting the long crystal furnace in the vertical direction after the long crystal furnace bears the furnace burden, simultaneously ensures that the furnace burden borne by the cover and the furnace body have high repeated positioning accuracy such as concentricity, and the levelness of the long crystal furnace lower cover placed on the lifting platform is kept unchanged when the lower cover bears the pretightening force or the bearing changes.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. The utility model provides a parallel feed screw elevating system which characterized in that includes:
positioning a plate;
the positioning frame is positioned above the positioning plate;
the lifting platform is arranged between the positioning frame and the positioning plate;
at least one pair of lead screws, including a first lead screw and a second lead screw; the first lead screw and the second lead screw are movably connected with the positioning frame and the positioning plate, and are in screw transmission fit with the lifting platform;
a rotary driving assembly is arranged on the positioning plate or the positioning frame and comprises at least one driving shaft, a first synchronous transmission mechanism is arranged between the driving shaft and the first lead screw, and a second synchronous transmission mechanism is arranged between the first lead screw and the second lead screw;
at least one tensioning assembly for tensioning the second synchronous drive mechanism;
the lifting platform comprises a lifting platform main body and a lifting platform auxiliary supporting frame, wherein the first end of the lifting platform main body is fixedly connected with a first lead screw, the first end of the lifting platform auxiliary supporting frame is fixedly connected with a second lead screw, and the second end of the lifting platform main body is close to the first end of the lifting platform auxiliary supporting frame and is supported by the lifting platform auxiliary supporting frame;
the double-screw lifting mechanism further comprises at least two pairs of guide rods which penetrate through the lifting platform and are parallel to the first screw and the second screw and are symmetrically arranged with the center of the lifting platform, two ends of each guide rod are respectively arranged on the positioning plate and the positioning frame, and the guide rods are connected with the lifting platform through box-type sliding blocks.
2. The double-screw lifting mechanism according to claim 1, wherein the second synchronous transmission mechanism comprises a first synchronous pulley arranged on the first screw, a second synchronous pulley arranged on the second screw and a second synchronous belt connecting the first synchronous pulley and the second synchronous pulley;
the tensioning assembly is used for tensioning the second synchronous belt.
3. The dual bar lift mechanism of claim 2, wherein the direction of travel of the second timing belt past the tensioning assembly is substantially constant.
4. The dual lead screw lift mechanism of claim 2, wherein the tension assembly comprises: the tensioning synchronous belt pulley and the tensioning belt pulley mounting plate are tensioned, and a strip-shaped mounting hole for fixing the tensioning belt pulley on the positioning plate is formed in the tensioning belt pulley mounting plate;
the included angle between the long axis of the strip-shaped mounting hole and the connecting line of the first lead screw and the second lead screw is α, and the included angle is more than 0 degree and less than α degrees and less than or equal to 90 degrees;
the second synchronous belt is connected with the first synchronous belt wheel, the tensioning synchronous belt wheel and the second synchronous belt wheel.
5. The dual lead screw lift mechanism of claim 4, wherein the tension assembly further comprises a guide wheel;
the second synchronous belt is connected with the first synchronous belt wheel, the guide wheel, the tensioning synchronous belt wheel and the second synchronous belt wheel, and the guide wheel is used for adjusting the conveying direction of the second synchronous belt to be brought into and/or led out of the tensioning synchronous belt wheel.
6. The double-lead-screw lifting mechanism of claim 5, wherein the guide wheels comprise a first guide wheel and a second guide wheel, and the second synchronous belt is connected with the first guide wheel, the tensioning synchronous pulley and the second guide wheel in sequence;
the conveying directions of the second synchronous belt passing through the first guide wheel, the tensioning synchronous belt wheel and the second guide wheel are approximately the same.
7. The dual lead screw lift mechanism of claim 1 further comprising a puller assembly acting on the tensioning assembly to provide tension to the second synchronous drive mechanism.
8. The double-screw lifting mechanism according to claim 1, wherein the rotary driving assembly comprises a servo motor and a speed reducer, an output shaft of the servo motor is connected with the speed reducer, and an output shaft of the speed reducer is the driving shaft;
the rotary driving assembly is fixed on the positioning plate or the positioning frame through a driving mounting adjusting seat, the driving mounting adjusting seat is of a cavity structure, and the driving shaft and the first synchronous transmission mechanism are arranged in a cavity of the driving mounting adjusting seat.
9. The dual lead screw lifting mechanism of claim 1, wherein the positioning frame is a clip structure, and the lead screw is a ball screw or has trapezoidal threads.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811527963.1A CN109704228B (en) | 2018-12-13 | 2018-12-13 | Double-lead-screw lifting mechanism |
| PCT/CN2018/123724 WO2020118773A1 (en) | 2018-12-13 | 2018-12-26 | Lifting mechanism having two leadscrews |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811527963.1A CN109704228B (en) | 2018-12-13 | 2018-12-13 | Double-lead-screw lifting mechanism |
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| CN109704228A CN109704228A (en) | 2019-05-03 |
| CN109704228B true CN109704228B (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811527963.1A Active CN109704228B (en) | 2018-12-13 | 2018-12-13 | Double-lead-screw lifting mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115367659A (en) * | 2022-09-14 | 2022-11-22 | 烟台艾睿光电科技有限公司 | Position adjusting device |
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| CN201458648U (en) * | 2009-07-03 | 2010-05-12 | 中国空空导弹研究院 | Lifting device |
| CN202928904U (en) * | 2012-11-13 | 2013-05-08 | 深圳职业技术学院 | Impact testing device for packaging buffering material |
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| CN104444942A (en) * | 2014-10-30 | 2015-03-25 | 绵阳市维博电子有限责任公司 | Double-screw synchronous lifting mechanism |
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| DE3514804A1 (en) * | 1985-04-24 | 1986-11-06 | Hartmut Dipl.-Ing. 8013 Haar Kosche | Lifting device |
| CN201458648U (en) * | 2009-07-03 | 2010-05-12 | 中国空空导弹研究院 | Lifting device |
| CN202928904U (en) * | 2012-11-13 | 2013-05-08 | 深圳职业技术学院 | Impact testing device for packaging buffering material |
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| CN109704228A (en) | 2019-05-03 |
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