Utility model content
The purpose of this utility model is to be provided for scanning bed automatically controlled horizontal feed device, has solved the problems such as the frictional force existing in existing apparatus is large, sensitivity is low, poor reliability.Consider the specific (special) requirements such as the scanning bed material of MRI, deadweight and bearing capacity, automatically controlled horizontal feed apparatus structure is clear, and processing technique is simple, saves cost, can accomplish accurately, stably complete the action that seesaws of scanning bed level.In addition, the servo drive system of automatically controlled horizontal feed has Stroke Control double protection functions, can realize respectively the duplicate protection to front and back extreme position in stroke, has improved the reliability of the scanning bed lengthwise movement of MRI.
In order to reach above-mentioned purpose, this utility model has adopted following technical scheme, for scanning bed automatically controlled horizontal feed device, comprise bed board, underframe, front and back guide slide mechanism, guide slide mechanism before and after being provided with between described underframe and the bed board of top, and underframe produces the relative action that moves forward and backward with bed board by front and back guide slide mechanism.
Described underframe is by front-axle beam, the back rest, left longeron, right vertical beam encloses fixedly and forms, at left longeron, connecting plate is also set between right vertical beam, described front and back guide slide mechanism comprises track and the ceramic bearing being used in conjunction with each other, described track is divided into bed board track and longeron track, bed board track is arranged on bed board lower surface both sides, and bed board support roller is set below bed board, longeron track is arranged on the inner side of left-right longeron, described ceramic bearing is inlaid into left-right longeron upper surface and medial surface, described bed board support roller coordinates with longeron track, described bed board track coordinates with the ceramic bearing of left-right longeron upper surface, bed board support roller is left with vertical embedding, the moving scanning bed length feed that completes of ceramic shaft support of right vertical beam upper surface moves, be embedded in a left side, the ceramic bearing sub-scanning bed of right vertical beam inner side completes bed board guide-localization.
Described underframe bottom is also provided with the front and back range controlling mechanism that drives bed board to move forward and backward.
Described front and back range controlling mechanism comprises driving mechanism, electronic control system, described driving mechanism comprises direct current generator, driving wheel, driven pulley, described driven pulley is connected by Timing Belt with driving wheel, driven pulley mounts the front end at underframe by support, described driving wheel docks and is arranged on underframe rear end with direct current generator outfan, described direct current generator is arranged on electric machine support, between described driving wheel and motor output end, be provided with electromagnetic clutch, on described electromagnetic clutch, be provided with electromagnetic clutch armature, described electromagnetic clutch is fixed on electric machine support, described electromagnetic clutch is connected with electronic control system, described bed board bottom is provided with Timing Belt clamp device, described Timing Belt clamp device is engaged on the Timing Belt fastening teeth piece of self on Timing Belt by screw, near described underframe front end driven pulley, be provided with the belt tensioning device being connected with Timing Belt.
Described front and back range controlling mechanism also comprises signal output mechanism, described signal output mechanism is mainly encoder, described encoder is arranged on electric machine support by encoder support, is provided with encoder belt wheel on described encoder, subsidiary synchronous pulley on described driving wheel; Described encoder belt wheel is connected by encoder hold-in range with the synchronous pulley on driving wheel, and described encoder is all connected with electronic control system with direct current generator.
Described underframe front and back end is respectively arranged with stroke double protecting device, is respectively front end stroke double protecting device, rear end stroke double protecting device.
Described bed board bottom is provided with Timing Belt clamp device, and described stroke double protecting device comprises contact and the switch that corresponding matching is used mutually up and down, and described switch is arranged on underframe, and described contact is arranged on Timing Belt clamp device.
The quantity of described switch setting is at least two covers, and described switch comprises folded limit switch and utmost point guarantor switch by arranging mutually.
Described left longeron also arranges working position switch on bottom surface, and working position switch is fixed on left longeron bottom surface by switch bracket.
Compared to prior art, the utlity model has following beneficial effect:
The scanning bed feed system of MRI that this utility model is perfect.Improved the servo-actuating device of feed system, material and the structure of transmission tissue, guider etc.; Increased Stroke Control duplicate protection mechanism.Make the structural design of the scanning bed automatically controlled horizontal feed device of MRI more reasonable, processing technique is simpler, saves cost, and can accomplish accurately, stably to complete the action that seesaws of scanning bed level, has improved the reliability that the scanning bed level of MRI seesaws.Applied widely, travel control device can be realized various modes (electric model, manual mode, power-down mode) level of control and move forward and backward operation.
In energising situation, armature friction on electromagnetic clutch is attached on direct current generator, direct current generator drives driving wheel to rotate by electromagnetic clutch, thereby the synchronous pulley of drive installation on moving component, make the rotation of motor can drive the magnet of electromagnetic clutch to be synchronized with the movement, realize the straight line of drive disk assembly or rotatablely move (what this utility model realized is the rectilinear motion of Timing Belt, and then realize scanning bed level seesaw), and travel displacement data can show.Under manual mode, armature and the motor of clutch are separated, and driving pulley can freely rotate, and realizes armstrong's patent Move Mode, and travel displacement data can accurately show.If entire system power-off, armature and the motor of clutch are separated, and driving wheel can freely rotate, and realize scanning bed feed motion and the in the situation that of the artificial application of force, complete level front and back feed motion.Avoid because of drive motors fault, during entire system power-off, be scanned object and be stranded the sight generation in scanning area.
The specific embodiment
Relevant detailed description of the present utility model and technology contents, coordinate accompanying drawing to be described as follows, yet accompanying drawing only provides the use of reference with explanation, is not used for this utility model to be limited.
Shown in Fig. 1-2, for scanning bed automatically controlled horizontal feed device, comprise bed board 1, underframe, front and back guide slide mechanism, guide slide mechanism before and after being provided with between described underframe and the bed board of top, and underframe produces the relative action that moves forward and backward with bed board by front and back guide slide mechanism.Described underframe is by front-axle beam 8, the back rest 6, left longeron 4, right vertical beam 7 encloses fixedly and forms, at left longeron, connecting plate 5 is also set between right vertical beam, described front and back guide slide mechanism comprises track and the ceramic bearing 3 being used in conjunction with each other, described track is divided into bed board track and longeron track, bed board track is arranged on bed board lower surface both sides, and bed board support roller 2 is set below bed board, longeron track is arranged on the inner side of left-right longeron, described ceramic bearing is inlaid into left-right longeron upper surface and medial surface, described bed board support roller coordinates with longeron track, described bed board track coordinates with the ceramic bearing of left-right longeron upper surface, bed board support roller is left with vertical embedding, the moving scanning bed length feed that completes of ceramic shaft support of right vertical beam upper surface moves, be embedded in a left side, the ceramic bearing sub-scanning bed of right vertical beam inner side completes bed board guide-localization.Its object is capable of reducing friction resistance, reduces noise, improves precision and feed speed.
Described underframe bottom is also provided with the front and back range controlling mechanism 16 that drives bed board to move forward and backward.Described front and back range controlling mechanism comprises driving mechanism, electronic control system, described driving mechanism comprises direct current generator, driving wheel, driven pulley, described driven pulley is connected by Timing Belt 13 with driving wheel, driven pulley is put the front end at underframe by bracing frame 9, described driving wheel docks and is arranged on underframe rear end with direct current generator outfan, described direct current generator is arranged on electric machine support, between described driving wheel and motor output end, be provided with electromagnetic clutch, on described electromagnetic clutch, be provided with electromagnetic clutch armature, described electromagnetic clutch is fixed on electric machine support, described electromagnetic clutch is connected with electronic control system, described bed board bottom is provided with Timing Belt clamp device 12, described Timing Belt clamp device is engaged on the Timing Belt fastening teeth piece of self on Timing Belt by screw, near described underframe front end driven pulley, be provided with the belt tensioning device 10 being connected with Timing Belt.In energising situation, armature friction on electromagnetic clutch is attached on direct current generator, direct current generator drives driven wheel to rotate by electromagnetic clutch, thereby the synchronous pulley of drive installation on moving component, make the rotation of motor can drive the magnet of electromagnetic clutch to be synchronized with the movement, realize the straight line of drive disk assembly or rotatablely move (what this utility model realized is the rectilinear motion of Timing Belt, and then realize scanning bed level seesaw), and travel displacement data can show.Under manual mode, armature and the motor of clutch are separated, and driving pulley can freely rotate, and realizes armstrong's patent Move Mode, and travel displacement data can accurately show.If entire system power-off, armature and the motor of clutch are separated, and driven wheel can freely rotate, and realize scanning bed feed motion and the in the situation that of the artificial application of force, complete level front and back feed motion.Avoid because of drive motors fault, during entire system power-off, be scanned object and be stranded the sight generation in scanning area.
Described front and back range controlling mechanism also comprises signal output mechanism, described signal output mechanism is mainly encoder, described encoder is arranged on electric machine support by encoder support, is provided with encoder belt wheel on described encoder, subsidiary synchronous pulley on described driving wheel; Described encoder belt wheel is connected by encoder hold-in range with the synchronous pulley on driving wheel, and described encoder is all connected with electronic control system with direct current generator.Guarantee any one small action of driven wheel, by Timing Belt, pass to encoder, encoder is immediately passed to electronic control system by rotation data, thereby realizes the advantage of accurately controlling stroke distances.
Described underframe front and back end is respectively arranged with stroke double protecting device, is respectively front end stroke double protecting device 11, rear end stroke double protecting device 15.Described bed board bottom is provided with Timing Belt clamp device, and described stroke double protecting device comprises contact and the switch that corresponding matching is used mutually up and down, and described switch is arranged on underframe, and described contact is arranged on Timing Belt clamp device.The quantity of described switch setting is at least two covers, and described switch comprises folded limit switch and utmost point guarantor switch by arranging mutually.After limit switch is touched, to electronic control system, send signal out of service, level seesaws out of service, completes defencive function for the first time.As emergency situations such as maloperations, it is touched that the utmost point is protected switch, to control system, sends power-off signal, and equipment is realized power operation, completes defencive function for the second time.Contact adopts Bilateral Symmetry design, and the contact on contact is designed to the domatic of one-sided two (or a plurality of) stepped folded different angles of leaning on and different contacts area, the domatic contact that is according to horizontal throw distance.When the domatic and limit switch corresponding to limit switch touches, complete defencive function for the first time.Domatic while touching with it when what protect switch corresponding to the utmost point, complete defencive function for the second time.
Described left longeron also arranges working position switch on bottom surface, and working position switch is fixed on left longeron bottom surface by switch bracket.Stroke Control duplicate protection organizes the single contact of many trigger points to be fixed on described Timing Belt fastening assembly.When the fastening assembly on Timing Belt moves to back rest range controlling mechanism, if the domatic working position switch that touches in a contact of contact illustrates that MRI scanning longitudinally retracts working position initial point.
Shown in Fig. 1-2, scanning bed feed system that the scanning bed automatically controlled horizontal feed device of MRI is perfect, make the structural design of the scanning bed automatically controlled horizontal feed device of MRI more reasonable, processing technique is simpler, save cost, and can accomplish accurately, stably to complete the action that seesaws of scanning bed level, improved the reliability that the scanning bed level of MRI seesaws.Applied widely, travel control device can be realized various modes (electric model, manual mode, power-down mode) level of control and move forward and backward operation.
1) some ceramic bearings are embedded respectively and be arranged on left and right longeron top, inner side, bed board support roller is arranged on to the front side of left and right longeron.Then with front-axle beam and the back rest, left and right longeron is tied, forms transmission tissue.
2) by soket head cap screw, direct current generator is fixed on electric machine support, electromagnetic clutch is connected with direct current generator by motor output shaft, then with screw, the armature on clutch is connected with driving pulley, then be arranged on motor output shaft, now, the driving mechanism unit of range controlling mechanism completes.
3) encoder is fixed on to one end of encoder support by three sunk screws, the encoder support other end is directly fixed on driver element support by two inner bolts, and encoder belt wheel is installed on the output shaft of encoder by holding screw.Then, encoder belt wheel is connected with the synchronous pulley of driving mechanism by Timing Belt, the installation of settling signal output unit.Then driver element support is fixed on to back rest left end.And then, range controlling mechanism installation.
4) by Timing Belt engaging sleeve on the driving pulley of left longeron rear side, and on the tensioning pulley of left longeron front side.Then, utilize tensioning screw to adjust belt stretcher, the encoder belt wheel of Timing Belt and range controlling mechanism is meshed together.
5) after scanning bed bed board grooves on two sides position is corresponding with back rest groove location, promote bed board forward, bed board can be installed on left and right longeron.
6) Timing Belt clamp device is fixed on the left back portion of scanning bed board below by Change-over frame, by screw, Timing Belt fastening teeth piece is engaged on Timing Belt.Now, under manual case, the artificial scanning bed board that promotes, drives drive motors clutch belt wheel to rotate by Timing Belt, completes scanning bed level front and back feed motion.
7) working position switch is fixed on left longeron bottom by switch bracket, and Stroke Control duplicate protection organizes the single contact of many trigger points to be fixed on described Timing Belt clamp device.
8) with screw two groups of folded switch combinations of leaning on mutually (being that limit switch and the utmost point are protected switch) in front-axle beam, the fixed installation of back rest left end.Jointly form Stroke Control duplicate protection mechanism with the single contact with many trigger points on fixing Timing Belt clamp device.
9) Stroke Control drive motors output lead, encoder output lead, working position switch output lead, Stroke Control double protection switches array output line are connected in electronic control system.
10) (electric model) switches on power, MRI scanning system is according to stroke distances before and after setting level, the armature friction that first electronic control system is controlled on electromagnetic clutch depends on direct current generator, then to the direct current generator on driving mechanism, sends turn signal.Then, the rotation of drive motors drives the magnet of electromagnetic clutch to be synchronized with the movement, magnet drives driving pulley to rotate by the armature rubbing mutually, according to the shift motion setting, apart from rotating photo, answer the number of turns (or angle), when approaching desired location, control system is sent slow progressive movable signal to the motor of driving mechanism, drive motors slowly rotates, drive encoder slow circumvolve on signal output mechanism angle accordingly simultaneously, motor is out of service, and moving displacement information is shown.Guarantee each small action message of Mechanical Moving equipment, by encoder, sent to electronic control system, completed Stroke Control.
11) similarly, MRI scanning work finishes.Electronic control system is sent before and after level and is exited scanning bed instruction, and the armature friction of first controlling on electromagnetic clutch depends on direct current generator, then to the direct current generator on driving mechanism, sends turn signal.Then, the rotation of drive motors drives the magnet of electromagnetic clutch to be reversed and is synchronized with the movement, magnet drives driving wheel to counter-rotate by the armature rubbing mutually, according to the shift motion setting, apart from rotating photo, answer the number of turns (or angle), and driven Timing Belt to start transmission distance to a declared goal round about.Approach while being fixed on the initial point working position switch on the back rest, control system is sent slow progressive movable signal to the motor of driving mechanism, drive motors slowly rotates, drive encoder slow circumvolve on signal output mechanism angle accordingly simultaneously, when contact is symmetrical, the first contact is domatic while touching initial point working position switch, the position signalling that electronic control system is sent by encoder obtains the exact position of stroke, it is fixed that electronic control system is sent accurate discontinuance to drive motors, motor is out of service, and moving displacement information is shown, the level of completing seesaws and exits scanning bed Stroke Control.
12) when needs bed board is when assigned address stops, the halt signal of the scanning bed electronic control system of MRI can pass to drive motors and complete action out of service, and displacement information is passed to electronic control system by encoder, and then shows.
13) after initial point working position switch is touched, if feed motion does not stop, Timing Belt continues transmission, after limit switch is touched, to electronic control system, sends signal out of service, and level seesaws out of service, completes defencive function for the first time.As emergency situations such as maloperations, it is touched that the utmost point is protected switch, to control system, sends power-off signal, and equipment is realized power operation, completes defencive function for the second time.Contact adopts Bilateral Symmetry design, and the contact on contact is designed to the domatic of one-sided two (or a plurality of) stepped folded different angles of leaning on and different contacts area, the domatic contact that is according to stroke distances before and after level.When the domatic and limit switch corresponding to limit switch touches, complete defencive function for the first time.Domatic while touching with it when what protect switch corresponding to the utmost point, complete defencive function for the second time.
14) electronic control system can preset initial point (or reduction point), terminal.For example, electronic control system is sent reset instruction, and travel control device repeats 11) until move to reduction point, complete Stroke Control.
15) under manual mode (being driving mechanism motor access failure power supply), on driving mechanism, the armature of clutch and drive motors are separated, now, driving wheel still can freely rotate, and then, scanning bed to assigned address by artificial promotion, and by the encoder of signal output mechanism, mobile data is passed to electronic control system, and be presented on screen.Guaranteed in the situation that motor breaks down, caused the system lock cannot the scanning bed drawback that cannot exit MRI scanning area.
16) similarly, under the situation of the whole power-off of MRI scanning system, armature and the drive motors of clutch are separated, and now, driving wheel still can freely rotate, and can manually promote the scanning bed assigned address that moves to.Guaranteed, when system cut-off, because mobile device is locked, to cause element damage.
The foregoing is only preferred embodiment of the present utility model, non-in order to limit the scope of the claims of the present utility model, other use the equivalence of patent spirit of the present utility model to change, and all should all belong to the scope of the claims of the present utility model.