A kind of crystal lifting device
Technical field
The present invention relates to a kind of crystal lifting device, relate in particular to the crystal lifting device that a kind of single crystal growing furnace is used.
Background technology
When making silicon single crystal, crystal lifting device is used for being lifted at the seed crystal of single crystal growing furnace, to realize the growth of silicon single crystal.In this process, seed crystal must rotate while promoting, and the speed of its lifting and speed of rotation must strictly be controlled, and just can reach the production purpose of expection.Simultaneously in actual applications, crystal lifting device must satisfy the stable requirement good to neutrality that reaches wireline of pulling speed.Existing crystal lifting device all is to adopt curled hair wheel rotation lay winding wire ropes to realize moving up and down of seed crystal, in the process of curled hair wheel rotation lay winding wire ropes, wireline easily skew and heap is pressed, influence the stability of lifting process medium velocity and wireline to neutrality.Chinese patent application 00805352.9 discloses a kind of " method and apparatus of control crystal diameter in the growth process ", in the device of this application, and the axle of electric motor and the mechanical joint between the drum, the cable solderless wrapped connection connects seed crystal on drum and through pulley.This application does not disclose the mechanism of detailed crystal lifting device, and those of ordinary skill in the field are difficult to realize without creative work; Simultaneously the device of this application in use, the clue on the drum is piled pressure easily, thereby influences the rotating speed of pulley, the pulling speed that has influenced seed crystal is stablized.European Patent Publication No GB2183212A discloses a kind of " stowage unit (Apparatus for handling loads) ", in this application, when rotating under the drive of drum at motor, towing mechanism by its bottom makes the base around the drum place produce displacement, thereby makes the position, the left and right sides of the cable that hangs with weight keep stable.But this device is because the towing mechanism that reaches in the base lower end around drum, base is that the up-down structure relation causes volume bigger; Be connected by chain pitch wheel with axis of traction around drum simultaneously, often gapped in the linkage process of chain and gear, thus influenced precision when controlling pull rate; On the other hand, this installs in use, is subjected to the traction of towing mechanism could produce displacement simultaneously around drum, base and motor, so towing mechanism is stressed very big, causes towing mechanism to wear and tear easily, has influenced work-ing life.
Summary of the invention
The object of the invention is to provide a kind of simple in structure, long service life,, speed stability good and control accuracy high crystal lifting device good to neutrality.
The technical scheme that realizes the object of the invention is: crystal lifting device of the present invention, comprise that one is taken turns by curled hair, be wound on the haulage cable on the described curled hair wheel, take turns with described curled hair and coaxially to be connected and to be rotatably supported in a transmission shaft on the supporter, and drive the lifting assemblies that actuating unit that described transmission shaft and described curled hair wheel rotate is formed; It is characterized in that a traction wheel and described curled hair wheel is fixed together, and be socketed in together on the described transmission shaft; Described transmission shaft at least can being connected along described transmission shaft by spline with one of described traction wheel and described curled hair wheel axially slidably; A traction casing is fixed on the described supporter; Described traction wheel is threaded with described traction casing; The pitch of the screw thread between described traction wheel and the described traction casing determines that described traction wheel rotates the axial displacement that is produced in a week and equates in the opposite direction with respect to the axial displacement that the curled hair wheel produces with described rope traction end.Also has the wireline stabilizing mechanism, described wireline stabilizing mechanism is included in the spring support with an end closed cavity that is provided with on the position corresponding with the traction end of described wireline on the described supporter, and the opening end of described cavity is facing to the traction end of described wireline; A slide unit that can slide along described cavity is set in the described closed cavity of described spring support and described slide unit is applied bias piece towards the reactive force of described closed cavity opening end; Described slide unit abuts against on the described curled hair wheel the described wireline of correspondence position.
In the technique scheme, also have the traction position-limit mechanism, described traction position-limit mechanism comprises that one of the described traction wheel that is fixed together at least and described curled hair wheel are provided with forked plectrum wheel; A dial that is connected with described forked plectrum wheel; A guide rod that is equipped with described dial; The magnetic block that on described guide rod, keeps at a certain distance away and be provided with described dial; And on described supporter corresponding to first limit switch and second limit switch of the alternate setting of displacement region of described magnetic block.
In the technique scheme, described magnetic block on guide rod the position and the phase spacing of described first limit switch and second limit switch can adjust.
In the technique scheme, described magnetic block reciprocatingly slides under the drive of described guide rod in the slideway that a synthetic glass cover constitutes.
In the technique scheme, described slide unit forms the groove of a vertical near an end of described curled hair wheel, a contact roller is set in the groove of described vertical, and the rotating shaft of described contact roller is arranged in the chute on the two side of groove that along continuous straight runs is molded over described vertical.
In the technique scheme, between described contact roller and its rotating shaft, be provided with bearing.
In the technique scheme, described curled hair wheel cylindrical is provided with the thread groove that the described wireline of guiding is arranged, and the pitch of the screw thread between the pitch of described thread groove and described traction wheel and the described traction casing equates.
The present invention has positive effect: (1) traction wheel of the present invention and described curled hair wheel are fixed together, and be socketed in together on the described transmission shaft, in the horizontal servo-actuated that has realized the curled hair wheel, guaranteed the stable of position, the wireline left and right sides, improved the stability of lifting process medium velocity and wireline to neutral simultaneously, simplified the structure of described crystal lifting device.When the interlock of transmission shaft, traction casing and traction wheel, stressed less simultaneously, guaranteed work-ing life.(2) the present invention limits the move left and right position that curled hair is taken turns by the relative position of adjusting magnetic block and switch, makes crystal lifting device of the present invention be applicable to not allomeric condition of molding.(3) press wireline and curled hair wheel by bias piece, further guaranteed the stability of rope hoisting speed and neutrality.
Description of drawings
Fig. 1 is the structural representation of crystal lifting device of the present invention.
Fig. 2 is the A-A cross section view among Fig. 1.
Embodiment
Referring to Fig. 1 and Fig. 2, realize that crystal lifting device of the present invention has lifting assemblies, left end cap 1, transmission shaft 2, traction casing 3, traction wheel 4, supporter 5, spacing pulley 6, wireline 7, curled hair wheel 8, right end cap 10, weight 15, dial 16, forked plectrum wheel 17, guide rod 18, magnetic block 20, synthetic glass cover 21, first limit switch 22, second limit switch 23, contact roller 24, bearing 25, sliding shoe 26, spring 27 and spring support 28.
Lifting assemblies comprises shaft joint 12, step-down gear 13 and electric motor 14, and electric motor 14 is connected with step-down gear 13, with described curled hair take turns 8 coaxial be connected and be rotatably supported in a transmission shaft 2 on the supporter 5 be connected by axial organ 12 with step-down gear 13.
Supporter 5 upsides have bezel 9, and the bottom of supporter 5 is a base plate 19.
One end of wireline 7 is wound on the described curled hair wheel 8, and the other end is connected with weight 15.
Traction wheel 4 is shaped to one (in other embodiments, such as be the needs of processing or assembling, traction wheel 4 and curled hair wheel 8 can be two independently parts that are fixed together) with curled hair wheel 8, and is socketed in together on the transmission shaft 2; Transmission shaft 2 and traction wheel 4 can be along being connected axially slidably of described transmission shaft 2 (obviously also can adopt transmission shaft 2 and curled hair wheel 8 can be along the ways of connecting axially slidably of described transmission shaft 2 by spline) in other embodiments, by spline.
Curled hair is taken turns 8 cylindricals and is provided with the thread groove that guide wire rope 7 is arranged, and the pitch of the screw thread between the pitch of thread groove and traction wheel 4 and the traction casing 3 equates.
Traction casing 3 is fixed on the supporter 5; Traction wheel 4 is threaded with traction casing 3; The pitch of the screw thread between traction wheel 4 and the traction casing 3 determines that traction wheel 4 rotates the axial displacement that is produced in a week and equates in the opposite direction with the axial displacements of wireline 7 traction ends with respect to 8 generations of curled hair wheel.
Described traction position-limit mechanism comprises: traction wheel 4 is provided with forked plectrum wheel 17 (among other embodiment, also can be on the curled hair wheel 8 forked plectrum wheel 17 to be set); A dial 16 that is connected with forked plectrum wheel 17; A guide rod 18 that is equipped with dial 16; The magnetic block 20 that on guide rod 18, keeps at a certain distance away and be provided with dial 16; And on supporter 5 corresponding to first limit switch 22 and second limit switch 23 of the alternate setting of displacement region of magnetic block 20.
Spacing pulley 6 is arranged on the left end of curled hair wheel 8.
Magnetic block 20 on guide rod 18 the position and the phase spacing of first limit switch 22 and second limit switch 23 can adjust.
Magnetic block 20 reciprocatingly slides under the drive of guide rod 18 in the slideway that a synthetic glass cover 21 constitutes.
The wireline stabilizing mechanism comprises, the spring support with an end closed cavity 28 that on position corresponding on the supporter 5, is provided with the traction end of wireline 7, and the opening end of cavity is facing to the traction end of wireline 7; Sliding shoe 26 and spring 27 are arranged in the spring support 28, between contact roller 24 and its rotating shaft, be provided with bearing 25, the axis hole of contact roller 24 passes bearing 25, and spring 27 presses sliding shoe 26, and while sliding shoe 26 compresses contact roller 24 makes contact roller 24 press wireline 7 and curled hair wheel 8.
Left end cap 1 is fixedly installed on the left end of supporter 5, and right end cap 10 is fixedly installed on the right-hand member of supporter 5, and sealing cover 11 is fixedly installed on the right-hand member of right end cap 10, and synthetic glass cover 21 is fixedly installed on the left end of left end cap 1.