CN217278875U - Magnetic field measuring device for cyclotron - Google Patents

Abstract

The utility model relates to a magnetic field measuring device for cyclotron, include: the device comprises an outer shaft, an inner shaft sleeved in the outer shaft, a measuring arm, a radial measuring mechanism and a circumferential measuring mechanism which are arranged on the measuring arm, a first driving mechanism and a second driving mechanism; the top end of the outer shaft is fixedly connected with the radial measuring arm, the inner shaft is sleeved in the outer shaft, the top end of the inner shaft extends out of the top end of the outer shaft, and the top end of the inner shaft is connected with the radial measuring mechanism on the measuring arm; the output end of the first driving mechanism is connected with the bottom end of the outer shaft and is used for driving the outer shaft to rotate, and the outer shaft rotates to drive the circumferential measuring mechanism to rotate; the output end of the second driving mechanism is connected with the bottom end of the inner shaft, and the measuring mechanism is used for measuring the magnetic field intensity. The cyclotron magnetic field measuring device is compact in structure, and can more accurately measure the magnetic field intensity of a magnetic field at each position along the radial direction and the circumferential direction.

Description

Magnetic field measuring device for cyclotron

Technical Field

The utility model relates to a cyclotron field especially relates to a magnetic field measuring device for cyclotron.

Background

A cyclotron is a device that uses a magnetic field and an electric field to cause charged particles to make a cyclotron motion, and repeatedly accelerates the charged particles in the motion by a high-frequency electric field. The gap between the upper pole head and the lower pole head of the magnetic field formed by the cyclotron is small, the gap is a relatively closed space, and only a central hole and a side hole can lead to the air gap of the pole heads. The cyclotron is designed for an isochronous magnetic field, the magnetic field intensity is high, the magnetic field in the whole polar surface range needs to be measured, and the requirements on the magnetic field measurement and the positioning accuracy are high.

The angular and radial power transmission of the existing magnetic field measuring platform respectively adopts two paths of transmission, namely, the transmission passes through a central hole and a side hole of a magnet, so that the installation difficulty and precision are increased. And the angular transmission adopts synchronous belt transmission, and the synchronous belt can have a slipping phenomenon in the use process, so that the measurement process is discontinuous, and the measurement precision is influenced.

In addition, the current magnetic field measuring platform's angular rotation adopts step motor to reduce slew velocity through the gearbox, and encoder cooperation step motor closed loop operation is limited to and uses encoder location circumferential position, and its radial positioning need be adjusted through manual work cooperation tracker, and positioning accuracy is relatively poor. Meanwhile, the Hall probe is small in position adjusting range and is difficult to adjust to the middle plane of the cyclotron. And the central transmission shaft of the device needs manual shimming to adjust the concentricity of the central transmission shaft and the cyclotron, thereby wasting time and labor. The device is heavy in structure and cannot continuously and accurately measure the magnetic field.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model aims at providing a magnetic field measurement device for cyclotron, this magnetic field measurement device is compacter lighter, can guarantee the installation accuracy on the cyclotron through magnetic field measurement device self precision, reduces the thought precision adjustment in the installation.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a magnetic field measurement device for a cyclotron, comprising:

the outer shaft and the inner shaft are coaxially sleeved, and two ends of the inner shaft extend out of the outer shaft;

the measuring arm is connected to the top end of the outer shaft;

a measuring mechanism mounted on the measuring arm and connected to the top end of the inner shaft, the measuring mechanism being configured to measure the magnetic field strength at various positions within the range of the magnetic field pole faces of the cyclotron;

the output end of the first driving mechanism is connected with the bottom end of the outer shaft, and the first driving mechanism is configured to drive the outer shaft to rotate so as to drive the measuring mechanism to rotate in the circumferential direction;

and the output end of the second driving mechanism is connected with the bottom end of the inner shaft, and the second driving mechanism is configured to drive the inner shaft to rotate so as to drive the measuring mechanism to move along the radial direction.

Preferably, still include supporting disk and rolling disc, the top surface of supporting disk is equipped with a plurality of ball along circumference interval, the supporting disk with pass through between the rolling disc ball roll connection, measuring arm fixed mounting be in on the rolling disc, the outer axle pass the supporting disk with rolling disc fixed connection.

Preferably, the top of outer axle still overlaps and is equipped with graphite cover, graphite cover the top with supporting disk fixed connection, outer axle passes graphite cover with the supporting disk, and the top with rolling disc fixed connection.

Preferably, the measuring arm is a rectangular square frame-shaped support, the square frame-shaped support comprises two parallel longitudinal beams which are arranged at intervals and two cross beams which are respectively connected with two ends of the longitudinal beams, and guide rails are arranged on the inner side walls of the two longitudinal beams along the length direction.

Preferably, the measuring mechanism comprises a probe trolley, a pinion, a rack, a probe bracket, a probe and a slide block, the probe trolley is connected with the guide rail of the measuring arm in a sliding mode through the slide block, the rack is installed on the probe trolley, the rack is arranged in parallel with the longitudinal beam of the measuring arm, the top end of the inner shaft is fixedly connected with the pinion, the pinion is meshed with the rack, the probe bracket is fixedly installed on the probe trolley, and the probe is fixedly installed on the probe bracket.

Preferably, the measuring mechanism further comprises a radial glass grating fixedly mounted on one side of the rack for measuring the radial position of the probe.

Preferably, first actuating mechanism includes first motor support, flange, first driving motor, first shaft coupling and first drive mechanism, first driving motor fixed mounting be in on the first motor support, the top of first motor support is passed through flange fixed mounting be in the bottom surface of the lower iron yoke of cyclotron, first driving motor's output with pass through between the outer axle first drive mechanism with first shaft coupling transmission is connected.

Preferably, the measuring mechanism further comprises an angular encoder, the angular encoder is fixedly mounted on the first motor support and used for measuring the circumferential position of the measuring arm, the outer shaft penetrates through the angular encoder, and the top end of the outer shaft is fixedly connected with the rotating disc.

Preferably, the second driving mechanism includes a second motor bracket, a second driving motor, a second coupling and a second transmission mechanism, the second driving motor is fixedly installed, the output end of the second driving motor is in transmission connection with the bottom end of the inner shaft through the second transmission mechanism and the second coupling, the inner shaft passes through the outer shaft, and the top end of the inner shaft is connected with the measuring mechanism.

Preferably, the inner shaft is a hollow shaft, and the probe and the signal wire of the radial glass grating penetrate through the inner shaft to be connected with a computer.

The utility model discloses owing to take above technical scheme, it has following advantage:

1. the utility model provides an angular and radial transmission adopt the sleeve shaft transmission, make measuring device compacter more light, can guarantee the installation accuracy on cyclotron through measuring device self precision, reduce the thought precision adjustment in the installation.

2. The utility model provides an angle and radial servo motor and high accuracy grating chi and the closed loop operation of encoder are adopted and are guaranteed the accurate location in the measurement process.

3. The utility model provides a transmission sleeve shaft installs high accuracy graphite cover additional and guarantees the concentricity of sleeve shaft and magnet and reduces the vibrations that produce because of the friction in transmission process. And a ceramic ball supported structure is used below the measuring arm to reduce the vibration of the angular movement of the measuring arm caused by friction. All materials are non-magnetic materials such as ceramics, graphite, stainless steel and the like, so that the measurement precision can be further improved;

the radial motion adopts rack transmission, so that the phenomenon of slipping of a synchronous belt is avoided; in order to ensure that the Hall probe can be accurately positioned on the middle plane of the cyclotron, the probe support is designed into a structure capable of being adjusted up and down.

Drawings

Fig. 1 is a diagram illustrating a usage state of a magnetic field measuring device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an angular direction of the magnetic field measuring device according to the embodiment of the present invention;

fig. 3 is a schematic structural view of the magnetic field measuring device according to another angular direction in the embodiment of the present invention;

fig. 4 is a schematic structural diagram of the magnetic field measuring device in the embodiment of the present invention after the measuring part and the driving part are removed;

fig. 5 is a schematic structural view of the measuring arm and the measuring mechanism of the present invention;

description of reference numerals:

1-lower iron yoke, 2-lower pole head, 3-measuring device, 31-outer shaft, 32-inner shaft, 33-measuring arm, 34-measuring mechanism, 35-first driving mechanism, 36-second driving mechanism, 37-rotating disc, 38-graphite sleeve, 39-supporting disc, 331-longitudinal beam, 332-cross beam, 333-guide rail, 341-probe trolley, 342-probe bracket, 343-Hall probe, 344-sliding block, 345-rack, 346-pinion, 347-radial glass grating, 351-first motor bracket, 352-connecting flange, 353-first driving motor, 354-first connecting flange, 355-first transmission mechanism, 3551-first driving gear, 3552-first transmission gear, 361-second motor bracket, 362-second driving motor, 3631-second driving gear, 3632-second transmission gear, 364-second coupling.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, in order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment of the invention provides a magnetic field measuring device for a cyclotron, wherein a beam injection hole is formed in a lower iron yoke 1 of the cyclotron along a central axis, a magnetic field measuring device 3 penetrates through the beam injection hole, a measuring part of the measuring device 3 is positioned on a central plane between an upper pole head (not shown in the figure) and a lower pole head 2 of the cyclotron and is used for measuring the magnetic field intensity of each position in the range of a magnetic field pole surface, and a driving part of the measuring device 3 is positioned at the bottom of the lower iron yoke 1 and is used for driving the measuring part to move along the angular direction and the radial direction.

As shown in fig. 2, 3 and 4, the magnetic field measuring apparatus 3 includes: the measuring device comprises an outer shaft 31, an inner shaft 32 sleeved in the outer shaft 31, a measuring arm 33, a measuring mechanism 34 installed on the measuring arm 33, a first driving mechanism 35 and a second driving mechanism 36. The top end of the outer shaft 31 is connected with the measuring arm 33, the inner shaft 32 is sleeved in the outer shaft 31, two ends of the inner shaft 32 extend out of the outer shaft 31, and the top end of the inner shaft 32 is connected with the measuring mechanism 33 on the measuring arm 33. The output of first actuating mechanism 35 with the bottom of outer axle 31 is connected, is used for the drive outer axle 31 rotates, outer axle 31 rotates the drive measure arm 33 and install on the measure arm 33 measure mechanism 34 is along the rotation in circumference. The output end of the second driving mechanism 36 is connected to the bottom end of the inner shaft 32, and is used for driving the inner shaft 32 to rotate, the inner shaft 32 rotates to drive the measuring mechanism 34 to move in the radial direction, and the measuring mechanism 34 is used for measuring the magnetic field strength.

The utility model provides a measuring arm 33 and install measuring mechanism 34 on measuring arm 33 is located the central plane in the clearance between utmost point head and the lower utmost point head 2, measuring mechanism 34 is used for measuring the magnetic field intensity between utmost point head and the lower utmost point head 2. A beam injection hole is formed in the lower iron yoke 1 along the central axis, and the outer shaft 31 and the inner shaft 32 are connected with the measuring arm 33 after penetrating through the beam injection hole. The first driving mechanism 35 and the second driving mechanism 36 are installed at the bottom of the lower iron yoke 1, and are used for respectively driving the outer shaft 31 and the inner shaft 32 to rotate, the outer shaft 31 rotates to directly drive the measuring arm 33 and the measuring mechanism 34 installed on the measuring arm 33 to rotate along the circumferential direction, and the inner shaft 32 rotates to drive the measuring mechanism 33 to move along the proceeding direction of the measuring arm 33, so that the measuring mechanism 34 can detect along the circumferential direction and the radial direction in the central plane of the magnetic field, and further omnibearing magnetic field detection is realized.

The utility model provides a magnetic field measuring device establishes the mode that forms the sleeve spindle through the angular and radial transmission adoption interior axle 32 and outer axle 31 cover of each other, and the sleeve spindle passes the line filling hole, compares the mode that angular and radial transmission shaft pass through line filling hole and high frequency chamber preformed hole respectively among the prior art, and the measuring platform that can make is compacter and more light, guarantees the installation accuracy on the cyclotron through measuring platform self precision, has reduced the precision regulation in the installation.

As shown in fig. 5, the measuring arm 33 is preferably a rectangular square frame, the square frame includes two parallel longitudinal beams 331 spaced apart from each other and two cross beams 332 respectively connecting two ends of the longitudinal beams 331, guide rails 333 are formed on inner sidewalls of the two longitudinal beams 331 along a longitudinal direction, and the measuring mechanism 34 is mounted on the measuring arm 33 and slides along the guide rails 333 on the measuring arm 33 to move in a radial direction. The measuring arm 33 is located in a central plane between the upper pole head and the lower pole head 2. In order to further improve the connection strength between the two opposite longitudinal beams 331, a plurality of cross beams 332 for connection reinforcement are further arranged between the cross beams 332 at the two ends.

It should be understood that the measuring arm 33 is not limited to be provided in a square frame shape, the measuring arm 33 may also be provided to include only one longitudinal beam 331, the longitudinal beam 331 is mounted on the rotating disc 37, a guide rail 333 is provided on the longitudinal beam 331 along the length direction, and the measuring mechanism 34 moves along the length direction of the guide rail 333 under the transmission action of the second driving mechanism 36 and the inner shaft 32. Or, the measuring arm 33 can also be set up to include two longerons 331 that are parallel and set up at a certain distance apart and connect two at least a crossbeam 332 between the longeron 331, install on the longeron 331 along guide rail 333 carries out gliding slider 334, above-mentioned mode and as long as can realize that measuring mechanism 34 carries out horizontal slip along guide rail 333 should the utility model discloses in the scope of protection.

For convenience of installation, the measuring device further comprises a rotating disc 37, the measuring arm 33 is fixedly installed on the rotating disc 37, and the top of the outer shaft 31 is fixedly connected with the rotating disc 37 and used for driving the rotating disc 37 and the measuring arm 33 to rotate.

In order to ensure the parallelism between the measuring arm 33 and the polar head surface of the accelerator and reduce the vibration of the measuring arm caused by friction during angular motion, thereby further improving the measuring accuracy, the measuring device 3 further comprises a supporting plate 39, the supporting plate 39 is in contact with the polar surface of the cyclotron, the outer shaft 31 passes through the beam injection hole and then is fixedly connected with the bottom of the rotating disc 37, a plurality of balls 391 are arranged on the top surface of the supporting plate 39 at intervals along the axial direction, and the supporting plate 39 and the rotating disc 37 are in rolling connection through the balls 391. Preferably, the balls 391 are made of ceramic material.

In order to further improve the concentricity of the outer shaft 31 and the inner shaft 32 with the rotary accelerator 1 in the rotating process and reduce the vibration of the sleeve shaft caused by friction in the angular motion, thereby further improving the measurement accuracy, the contact part of the outer shaft 31 and the beam injection hole of the accelerator is also sleeved with a graphite sleeve 38 with high processing accuracy, and the top end of the graphite sleeve 38 is fixedly connected with the supporting plate 39, so that the sleeve shaft can be prevented from directly contacting with the beam injection hole in the rotating process, the friction force and the vibration generated by rotation can be further reduced, and the graphite sleeve 38 can play a role of lubrication, thereby further improving the measurement accuracy.

The measuring mechanism 34 includes a probe carriage 341, a pinion 346, a rack 345, a probe bracket 342, a probe 343 and a slider 344, the slider 344 is mounted on one side of the probe carriage 341, the probe carriage 341 is slidably connected with the guide rail 333 of the measuring arm 33 through the slider 344, the rack 345 is mounted on the probe carriage 341, the rack 345 is arranged in parallel with the longitudinal beam of the measuring arm 33, the top end of the inner shaft 32 is fixedly connected with the pinion 346, the pinion 346 is engaged with the rack 345, the probe bracket 342 is fixedly mounted on the probe carriage 341, preferably one end of the probe carriage 341, and the probe 343 is fixedly mounted on the probe bracket 342. The second driving mechanism 36 drives the inner shaft to rotate, the inner shaft 32 rotates to drive the pinion 346 to rotate, the pinion 346 is meshed with the rack 345, the rack 345 moves along the horizontal direction, so as to drive the probe trolley 341 to slide along the guide rail 333, and the probe trolley 341 slides to drive the probe 343 mounted on the probe trolley 341 to move along the radial direction.

The probe 343 is preferably a hall probe. The probe holder 342 is fixedly installed at one end of the probe car 341, so that the probe 343 can be driven to move in a radial direction when the probe car 341 moves along the guide rail 333. Wherein, preferably, the probe trolley 341 can move in the radial direction to enable the probe bracket 342 to move in the range of-20 mm to +820 mm.

The probe trolley 341 is located in the measuring arm, the probe trolley 341 includes two longitudinal bars parallel to each other and arranged at intervals and two cross bars connecting two ends of the two longitudinal bars, the two longitudinal bars are parallel to the two longitudinal beams, the two cross bars are parallel to the two cross beams, at least one sliding block 344 is arranged on the outer side of each of the two longitudinal bars, and the sliding block 344 is matched with the guide rail 333 and slides along the guide rail 333. The probe holder 341 is fixedly mounted on the cross bar at one end, and the probe 343 is fixedly mounted on the probe holder 342. The rack 345 is fixedly installed on the probe trolley 341, and the rack 345 is parallel to the two longitudinal rods, when the pinion 346 rotates, the rack 345 is driven to move, and the rack 345 moves to drive the probe trolley 342 and the probe 343 to move along the radial direction.

It is understood that the probe carriage 341 is not limited to the above-mentioned square frame structure, and the probe carriage 34 may be configured to include only one longitudinal bar, the rack is fixedly mounted on the longitudinal bar and is parallel to the rack and the longitudinal bar, one side of the longitudinal bar is slidably connected to the guide rail 333 through a sliding block 344, and when the rack 345 slides in the radial direction, the probe carriage 342 and the probe 343 are driven to move. The utility model discloses a probe dolly 341 is not limited to above-mentioned mode, as long as can realize following rack 345 slides along radial direction, drives simultaneously and installs probe support 342 and probe 343 above that and follow along radial direction removal, all is in the utility model discloses in the protection scope.

In order to adjust the position of the probe 343 in the direction perpendicular to the middle plane, the probe holder 342 is fixedly mounted on the end of the probe car 341, and the probe holder 341 can be adjusted up and down. The height of the probe holder 342 can be fixed to the probe carriage 341 by screws, for example, and the height of the probe can be adjusted by screwing the screws, so that the accuracy of magnetic field measurement can be further improved. Or the probe support 342 may be configured in a telescopic manner, such as a telescopic rod, and the probe 343 is fixedly mounted on the telescopic rod, so as to adjust the height of the probe.

Further, in order to accurately position the radial position of the probe 343 and more accurately move the probe 343 to a desired radial position, the measuring mechanism 34 further includes a radial glass grating 347, the radial glass grating 347 is fixedly mounted on one side of the rack 345, the radial glass grating 347 accurately positions the radial position of the probe 343 and transmits a positioning signal to a computer or a controller, and the controller compares the actual positioning signal of the probe 343 with a target positioning signal, so as to control the second driving mechanism 36, thereby forming a closed-loop control.

In order to facilitate signal transmission and installation, the structure of the measuring device 3 is more compact, the inner shaft is a hollow shaft, a hall probe 343 signal line and a radial glass grating 347 signal line which are installed on the hall probe support 342 are led out from the inner shaft to a computer, and the hall probe 343 signal and the radial and angular positions are accurately acquired during angular movement and radial movement of the measuring arm 33, so that accurate magnetic field distribution data is obtained.

As a preferred embodiment of the present invention, as shown in fig. 2 and 3, the first driving mechanism 35 includes: the first motor support 351, the connecting flange 352, the first driving motor 353, the first coupling 354 and the first transmission mechanism 355, wherein the first driving motor 353 is fixedly installed on the first motor support 351, the top end of the first motor support 351 is fixedly installed on the bottom surface of the lower iron yoke 1 of the cyclotron through the connecting flange 352, and the output end of the first driving motor 353 is in transmission connection with the outer shaft 31 through the first transmission mechanism 355 and the first coupling 354. The outer shaft 31 can be driven to rotate by the first driving motor 353, so as to drive the measuring arm 33 to rotate, thereby adjusting the angular position of the probe 343.

It will be appreciated that the first drive mechanism 35 may be replaced by a rotary cylinder or a drive mechanism such as a rotary cylinder, as long as it is capable of driving the outer shaft 31 to rotate.

In a preferred embodiment, the first transmission mechanism 355 includes a first driving gear 3551, a first driven gear 3552 and a timing belt connecting the first driving gear 3551 and the first driven gear 3552, an output end of the first driving motor 353 is fixedly connected to the first driving gear 3551, the first driving gear 3551 is in transmission connection with the first driven gear 3552 through the first timing belt, a gear shaft of the first driven gear 3552 is connected to the outer shaft 31 through a first coupling 351, a gear shaft of the first driven gear 3552 is hollow like the outer shaft 31, the inner shaft 32 passes through the gear shaft of the first driven gear 3552, the first coupling 354 and the outer shaft 311, and a top portion of the inner shaft extends out from a top end of the outer shaft 31.

It is understood that the first transmission mechanism 355 may also be provided with the first driving gear 3551 directly connected with the first driven gear 3552 through a toothed engagement transmission, or the first driving gear 3551 is connected with the first driven gear 3552 through a chain transmission, but in order to ensure the accuracy of the measurement, a synchronous belt transmission or a toothed engagement transmission mode is preferably adopted.

In order to right the angular position of probe carries out accurate location, the utility model provides a measuring device still includes angular encoder 357, angular encoder 357 is fixed in on first motor support 351, the angular encoder 357 that passes of the gear shaft of first driven gear 3552 can form the closed loop operation with first driving motor 353 when first driving motor 353 drives outer axle 31 and rotates to reach the angular position of accurate location measurement arm. The angular encoder 357 obtains the angular velocity of the rotation of the outer shaft 31 by measuring the number of turns of the outer shaft 31, and sends the detected signal to the computer, and the computer obtains the actual circumferential position of the probe according to the detected signal and controls the first driving motor 353, thereby finally obtaining the accurate circumferential position.

The second driving mechanism 36 includes a second motor holder 361, a second driving motor 362, a second coupling 364, and a second transmission mechanism 363, the second driving motor 362 is fixedly mounted on the second motor holder 361, and an output end of the second driving motor 362 is in transmission connection with the inner shaft 32 through the second transmission mechanism 363 and the second coupling 364.

The top of the second motor support 361 is fixedly connected with the bottom of the first motor support 351 or the lower iron yoke 1, a gear shaft of the first driven gear 3552 passes through the angular encoder 357 and is connected with the outer shaft 31 through the first coupling 354, the second driving motor 353 is fixedly mounted on the second motor support 361, and the second transmission mechanism 363 comprises a second driving gear 3631, a second driven gear 3632 and a second synchronous belt connecting the second driving gear 3631 with the second driven gear 3632; the output end of the second driving motor 362 is fixedly connected to the second driving gear 3631, the bottom of the inner shaft 32 penetrates through the bottom of the outer shaft 31 and is in transmission connection with the gear shaft of the second driven gear 3632 through the second coupling 364, the second driving motor 363 drives the inner shaft 32 to rotate, and the inner shaft 32 rotates to drive the probe holder 342 and the probe 343 to move along the radial direction of the force measuring arm.

The working principle of the magnetic field measuring device is as follows:

the outer shaft 32 is driven to rotate by the first driving mechanism 35, the outer shaft 32 is driven to rotate to drive the measuring arm 33 to rotate, and the measuring arm 33 rotates to drive the probe support 342 and the probe 343 mounted on the probe support 342 to rotate, so that the angular position of the probe 343 in the polar surface range is adjusted. When the probe 343 is moved to a desired angular position, the second driving mechanism 36 drives the inner shaft 32 to rotate, the inner shaft 32 rotates to drive the pinion 346 to rotate, the pinion 346 rotates to drive the rack 345 and the probe trolley 341 to slide along the guide rail 33, the probe trolley 341 slides to drive the probe support 342 and the probe 343 mounted on the probe support 342 to move along the proceeding direction, so as to adjust the angular and radial positions of the probe 343 in the polar orientation. Meanwhile, in order to more accurately position the radial and angular positions of the probe 343 and form a closed-loop control to further improve the positioning accuracy, the radial glass grating 347 accurately detects the radial position of the probe 343 and transmits a positioning signal to a computer or a controller, and the controller compares the actual positioning signal of the probe with a target positioning signal to control the second driving mechanism 36 and form a closed-loop control. The same angular encoder 357 detects the angular position of the probe and sends a detection signal to the computer, which controls the first drive mechanism 35 in a closed-loop control, based on a comparison of the detected actual angular position with the angular position of the target.

The utility model provides an angular and radial transmission adopt the sleeve shaft transmission, and all materials adopt no magnetism materials such as pottery and graphite and stainless steel, make measuring device 3 compacter more light, can guarantee the installation accuracy on cyclotron 1 through measuring device 3 self precision, reduce the thought precision in the installation and adjust.

The utility model provides an angular and radial servo motor that adopts and high accuracy grating chi 347 and encoder 357 closed loop operation guarantee the accurate location in the measurement process.

The utility model provides a transmission sleeve axle installs high accuracy graphite cover 38 additional and guarantees the concentricity of sleeve axle and magnet and reduces because of the vibrations that the friction produced in transmission process. And a structure supported by ceramic balls 391 is used under the measuring arm to reduce the shock of angular movement of the measuring arm due to friction. The radial motion adopts rack drive to avoid the phenomenon of synchronous belt skidding to appear. In order to ensure that the Hall probe can be accurately positioned on the middle plane of the cyclotron, the probe support is designed into a structure capable of being adjusted up and down.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A magnetic field measuring device for a cyclotron, comprising:

the outer shaft and the inner shaft are coaxially sleeved, and two ends of the inner shaft extend out of the outer shaft;

the measuring arm is connected to the top end of the outer shaft;

a measuring mechanism mounted on the measuring arm and connected to the top end of the inner shaft, the measuring mechanism being configured to measure the magnetic field strength at various positions within the range of the magnetic field pole faces of the cyclotron;

the output end of the first driving mechanism is connected with the bottom end of the outer shaft, and the first driving mechanism is configured to drive the outer shaft to rotate so as to drive the measuring mechanism to rotate in the circumferential direction;

and the output end of the second driving mechanism is connected with the bottom end of the inner shaft, and the second driving mechanism is configured to drive the inner shaft to rotate so as to drive the measuring mechanism to move along the radial direction.

2. The magnetic field measuring device of claim 1, further comprising a support plate and a rotating disc, wherein a plurality of balls are circumferentially spaced on a top surface of the support plate, the support plate is in rolling connection with the rotating disc through the balls, the measuring arm is fixedly mounted on the rotating disc, and the outer shaft penetrates through the support plate and is fixedly connected with the rotating disc.

3. The magnetic field measuring device of claim 2, wherein a graphite sleeve is further sleeved on the top of the outer shaft, the top end of the graphite sleeve is fixedly connected with the supporting disk, the outer shaft penetrates through the graphite sleeve and the supporting disk, and the top end of the outer shaft is fixedly connected with the rotating disk.

4. The magnetic field measuring device of claim 1, wherein the measuring arm is a rectangular frame-shaped bracket, the frame-shaped bracket comprises two parallel longitudinal beams spaced apart from each other and two cross beams respectively connecting two ends of the two longitudinal beams, and guide rails are disposed on inner side walls of the two longitudinal beams along a length direction.

5. The magnetic field measuring device according to claim 4, wherein the measuring mechanism comprises a probe trolley, a gear, a rack, a probe bracket, a probe and a slider, the probe trolley is slidably connected with the guide rail of the measuring arm through the slider, the rack is mounted on the probe trolley, the rack is arranged in parallel with the longitudinal beam of the measuring arm, the top end of the inner shaft is fixedly connected with the gear, the gear is meshed with the rack, the probe bracket is fixedly mounted on the probe trolley, and the probe is fixedly mounted on the probe bracket.

6. The magnetic field measuring device of claim 5, wherein the measuring mechanism further comprises a radial glass grating fixedly mounted on one side of the rack for measuring the radial position of the probe.

7. The magnetic field measuring device according to claim 2, wherein the first driving mechanism includes a first motor bracket, a connecting flange, a first driving motor, a first coupling and a first transmission mechanism, the first driving motor is fixedly mounted on the first motor bracket, the top end of the first motor bracket is fixedly mounted on the bottom surface of the lower iron yoke of the cyclotron through the connecting flange, and the output end of the first driving motor is in transmission connection with the outer shaft through the first transmission mechanism and the first coupling.

8. The magnetic field measuring device of claim 7, wherein the measuring mechanism further comprises an angular encoder fixedly mounted on the first motor bracket for measuring the circumferential position of the measuring arm, the outer shaft passes through the angular encoder, and a top end of the outer shaft is fixedly connected with the rotating disc.

9. The magnetic field measuring device according to claim 8, wherein the second driving mechanism comprises a second motor bracket, a second driving motor, a second coupling and a second transmission mechanism, the second driving motor is fixedly installed, an output end of the second driving motor is in transmission connection with a bottom end of the inner shaft through the second transmission mechanism and the second coupling, the inner shaft penetrates through the outer shaft, and a top end of the inner shaft is connected with the measuring mechanism.

10. The magnetic field measuring device of claim 6, wherein the inner shaft is a hollow shaft, and the probe and the signal wires of the radial glass grating pass through the inner shaft to be connected with a computer.

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