CN219197880U - Rotating shaft structure - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, and discloses a rotating shaft structure, which comprises: the rotary shaft outer sleeve is provided with a through cavity, the fixing assembly is movably arranged in the through cavity, the side wall of the rotary shaft outer sleeve is provided with a through hole, the plunger is arranged in the through hole, the outer side wall of the fixing assembly is provided with a concave structure and a smooth portion, and when the rotary shaft outer sleeve rotates relative to the fixing assembly, the plunger is alternately elastically abutted with the concave structure and the smooth portion. The rotating shaft structure reduces the rotation starting resistance of the nuclear magnetic resonance host machine head and simultaneously enables the nuclear magnetic resonance host machine head to hover in time after rotating.

Description

Rotating shaft structure

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a rotating shaft structure.

Background

In modern medicine, nuclear magnetic resonance techniques are widely used for various treatment phases. The nuclear magnetic resonance host can be rotated to check all directions of the body of a patient, thereby being more beneficial to diagnosis. After the nuclear magnetic resonance host is used, the nuclear magnetic resonance host needs to be hovered in time so as to be convenient for the next use.

In the related art, most nuclear magnetic resonance hosts hover through a base meter screw screwed into a rotating shaft outer sleeve of a host machine head, the base meter screw is abutted with a pressing plate, and the pressing plate is abutted against a sealing ring on the outer wall of the rotating shaft sleeve by screwing in the base meter screw, so that friction force between the pressing plate and the sealing ring is increased, rotating resistance of the rotating shaft outer sleeve is increased, and the nuclear magnetic resonance hosts fixedly connected with the rotating outer sleeve hover.

However, the hovering mode of the rotating shaft is inconvenient to use, the adjusting position of the base meter screw of the rotating shaft jacket is greatly influenced by the machining and assembling precision of other parts, and the adjusting position is not explicitly standard; the base meter screw is screwed too tightly, the rotation resistance of the nuclear magnetic resonance host machine head is too large, and a user rotates the machine head too hard, so that the use is influenced; the base meter screw is too loose to be screwed in, and the nuclear magnetic resonance host machine head cannot hover in time under the action of gravity.

Disclosure of Invention

The main purpose of the utility model is to provide a rotating shaft structure, which aims at reducing the rotation starting resistance of a nuclear magnetic resonance host machine head and enabling the nuclear magnetic resonance host machine head to hover in time after rotating.

In order to achieve the above object, the present utility model provides a rotating shaft structure, including:

the rotating shaft jacket is provided with a through cavity and a through hole connected with the through cavity;

the fixing component is movably arranged in the through cavity and is provided with a concave structure and a smooth part which are connected with each other;

the plunger penetrates through the through hole and is in butt joint with the outer wall of the fixing assembly;

when the rotating shaft outer sleeve rotates relative to the fixing assembly, the plunger is elastically abutted with the concave structure and the smooth part alternately.

In an embodiment, the plunger comprises a screw portion and a threaded portion arranged on the outer side of the screw portion, the threaded portion is made of weak magnetic stainless steel, and the screw portion is made of plastic.

In one embodiment, the concave structures are equally disposed around the outer side wall of the fixing component;

and/or the concave structure is a groove concavely arranged on the outer side wall of the fixing component; the bottom wall of the groove is an arc surface; the side wall of the groove and the joint of the smooth part are in smooth transition.

In one embodiment, the plungers comprise a plurality of plungers, and the spindle jacket is provided with the through holes corresponding to each plunger;

each concave structure is arranged corresponding to one plunger; or, each concave structure is arranged corresponding to a plurality of plungers.

In an embodiment, the plungers are arranged at intervals along the axial direction of the through cavity, and the concave structures are grooves extending along the axial direction of the fixing component, so that each concave structure is arranged corresponding to the plungers;

and/or, a plurality of plungers are arranged at intervals along the peripheral direction of the through cavity, the concave structures comprise a plurality of concave structures, a plurality of concave structures are arranged at intervals along the peripheral direction of the through cavity, and the concave structures are arranged in one-to-one correspondence with the plungers.

In an embodiment, the concave structure is a groove concavely arranged on the outer wall of the fixing component;

or, the concave structure is a through groove arranged on the outer wall of the fixing component;

or, the concave structure is a through hole arranged on the fixing component.

In an embodiment, the rotating shaft jacket is provided with a first port and a second port which are communicated with the through cavity, at least part of the structure of the fixing assembly is movably arranged on the second port in a penetrating manner, the inner wall of the rotating shaft jacket is provided with a first step, and the first step is arranged close to the first port;

the rotating shaft structure further comprises a pressing block, the pressing block is connected to the first step, the pressing block is provided with a protrusion, and the fixing assembly is provided with a limiting protrusion;

when the rotating shaft outer sleeve rotates for one circle relative to the fixing assembly, the limiting protrusion is abutted with the protrusion, so that the rotating shaft outer sleeve stops rotating towards the original rotating direction.

In an embodiment, the fixed subassembly includes pivot cover and fixed aluminum pipe, the pivot cover is located the outer wall of fixed aluminum pipe, and with the inner wall activity butt in logical chamber, the concave structure with smooth portion is located pivot cover lateral wall.

In an embodiment, the inner wall of the rotating shaft outer sleeve is further provided with a second step, the second step is arranged between the first step and the second port, the rotating shaft sleeve is positioned between the pressing block and the second step, and two ends of the rotating shaft sleeve are respectively in movable butt joint with the second step and the pressing block.

In an embodiment, the rotating shaft structure further comprises a sealing ring, and the sealing ring is clamped between the inner wall of the rotating shaft jacket and the outer wall of the fixing assembly.

According to the rotating shaft structure, the through cavity and the through hole for connecting the through cavity are formed in the rotating shaft outer sleeve, the fixing component is movably arranged in the through cavity and is provided with the concave structure and the smooth part which are connected, so that when the rotating shaft outer sleeve rotates relative to the fixing component, the plunger penetrating through the through hole is elastically abutted with the concave structure and the smooth part alternately; when the plunger is screwed in a proper position from the through hole, the rotating shaft outer sleeve rotates, the end head of the plunger is in a state of aggravated compression in a smooth part of the fixing assembly, friction force between the plunger and the outer side wall of the rotating shaft outer sleeve is larger at the moment, rotating resistance of the rotating shaft outer sleeve is larger, the plunger can hover and be clamped in the concave structure, when the plunger is clamped in the concave structure, compression degree of the inner spring of the plunger is reduced, friction force between the end head of the plunger and the outer side wall of the rotating shaft outer sleeve is reduced, rotating resistance of the rotating shaft outer sleeve is reduced, and a user can rotate the nuclear magnetic resonance host machine head fixedly connected with the rotating shaft outer sleeve again conveniently.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a structure of a rotor in an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an exploded structure of a rotor structure according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a structure of a rotating shaft according to another embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of the spindle structure of FIG. 3 along line A-A';

FIG. 5 is an enlarged view of the portion B of FIG. 4;

fig. 6 is a schematic structural view of a rotating shaft sleeve according to an embodiment of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a rotating shaft structure. Referring to fig. 1 to 6, the rotary shaft structure includes a rotary shaft housing 100, a fixing assembly 200, and a plunger 300, the rotary shaft housing 100 being provided with a through cavity 110 and a through hole 140 connecting the through cavity 110; at least part of the structure of the fixing component 200 is movably arranged in the through cavity 110, and the fixing component 200 is provided with a concave structure 211 and a smooth part 212 which are connected; the plunger 300 is inserted into the through hole 140 and is abutted against the outer wall of the fixing assembly 200; when the shaft housing 100 rotates relative to the fixing assembly 200, the plunger 300 elastically abuts against the concave structure 211 and the smooth portion 212 alternately.

In this embodiment, as shown in fig. 1 to 2, the rotating shaft jacket 100 may be a straight cylindrical structure, a curved cylindrical structure, a polygonal cylindrical structure or other shaped structures, and the rotating shaft structure is connected to a rotating member through one end of the rotating shaft jacket 100, and the rotating member may be a standing type nmr host machine head, a lying type nmr host machine head or other medical devices; the end of the fixing component 200 of the rotating shaft structure, which is far away from the rotating shaft sleeve 100, is connected with a fixing piece, and the fixing piece can be a fixing bracket, a wall surface or other fixing objects.

It can be appreciated that the outer wall of one end of the rotating shaft outer sleeve 100 far away from the fixing component 200 is convexly provided with a convex edge, the convex edge can be conveniently connected with the rotating member, the convex edge can be set into a triangle, a circle or other polygonal shapes, and a connecting groove with the same shape as the convex edge is arranged at the connecting position of the rotating member and the rotating shaft outer sleeve 100, so that the positioning or limiting function can be better realized.

In this embodiment, as shown in fig. 2 and 6, the concave structure 211 and the smooth portion 212 are alternately arranged in sequence, the concave structure 211 is concave relative to the smooth portion 212, and the contact surface between the smooth portion 212 and the plunger 300 is always kept in elastic abutment with the end of the plunger 300 to the same extent. When the rotating shaft sleeve 100 rotates relative to the fixing assembly 200, the plunger 300 is elastically abutted against the concave structure 211 and the smooth part 212 alternately; when the plunger 300 is screwed into the proper position from the through hole 140, the rotating shaft sleeve 100 is rotated, the end of the plunger 300 slides on the smooth part 212 of the fixing assembly 200, the internal spring of the plunger 300 is in a state of increasing compression compared with the normal state, at the moment, friction force between the plunger 300 and the outer side wall of the rotating shaft sleeve 210 is large, rotating resistance of the rotating shaft sleeve 100 is large, the nuclear magnetic resonance host machine head fixedly connected with the rotating shaft sleeve 100 can hover, the plunger 300 is clamped into the concave structure 211, when the plunger 300 is clamped into the concave structure 211, the compression degree of the internal spring of the plunger 300 is reduced, friction force between the end of the plunger 300 and the fixing assembly 200 is reduced, rotating resistance of the rotating shaft sleeve 100 is reduced, and a user can conveniently rotate the nuclear magnetic resonance host machine head fixed on the rotating shaft sleeve 100 again.

In practical implementation, the number and the size of the concave structure 211, the through hole 140 and the plunger 300 arranged in the through hole 140 are uniform and correspond to each other; the plunger 300 is adjustably screwed into the through hole 140, the inner wall of the through hole 140 is in a threaded shape, one or more concave structures 211, the through hole 140 and the plunger 300 can be arranged, the concave structures 211 can be grooves, pits with the same size as the end of the plunger 300 can be formed, the concave structures 211, the through hole 140 and the plunger 300 can be arranged along the circumferential direction, the arrangement of the concave structures 211, the through hole 140 and the plunger 300 can be also only arranged along the axial direction, or the arrangement along the circumferential direction and the axial direction can be simultaneously carried out, and the arrangement is not limited herein.

In an embodiment of the present utility model, the plunger 300 includes a screw portion 320 and a threaded portion 310 disposed outside the screw portion 320, wherein the threaded portion 310 is made of a weak magnetic stainless steel material, and the screw portion 320 is made of a plastic material.

In this embodiment, as shown in fig. 2 and 5, the threaded portion 310 of the plunger 300 disposed outside the screw portion 320 is made of weak magnetic stainless steel, so that the fastening effect of the plunger 300 is ensured by using a material with higher hardness while avoiding the influence of the strong magnetic material on the nuclear magnetic resonance effect; the screw portion 320 of the plunger 300 is made of plastic, when the nmr host machine head rotates, the end of the screw portion 320 of the plunger 300 rubs against the fixing component 200, the screw portion 320 is easy to damage, the plunger 300 uses the screw portion 320 made of plastic, the screw portion 320 made of plastic is easier to replace than the screw portion 320 made of metal, and the replacement cost of the screw portion 320 made of plastic is lower, so that the plunger 300 is convenient to maintain.

It can be appreciated that the thread portion 310 may be continuously arranged on the outer wall of the stud portion in a spiral manner, or may be arranged at intervals on the outer wall of the stud portion in a segmented manner; of course, in other embodiments, the screw portion 310 of the plunger 300 may be made of other weak magnetic or non-magnetic materials, and the screw portion 320 of the plunger 300 may be made of other materials such as rubber and plastic, which are not limited herein.

In one embodiment of the present utility model, the recess structure 211 is equally disposed around the outer sidewall of the fixing assembly 200.

In this embodiment, as shown in fig. 1 to 2 and fig. 6, the concave structures 211 are equally arranged around the outer side wall of the fixing component 200, so that the width of the smooth portion 212 is consistent, when the nmr host machine head hovers, the plunger 300 is clamped into any concave structure 211, and the rotation shaft outer sleeve 100 hovers in equal gear, so as to realize equal gear hovering of the nmr host machine head fixedly connected with the rotation shaft outer sleeve 100; the equal gear hovering of the nuclear magnetic resonance host machine head is beneficial to nuclear magnetic resonance specific angle examination, and the nuclear magnetic resonance specific angle examination is convenient for carrying out targeted diagnosis and treatment on an examination object. In practical implementations, the concave structure 211 may be divided into four halves, twelve halves, or other halves around the fixing assembly 200, so as to achieve hovering of the nmr at a plurality of specific angles, which is not limited herein.

In an embodiment of the present utility model, the recess structure 211 is a groove concavely formed on the outer sidewall of the fixing component 200; the bottom wall of the groove is an arc surface; the junction of the side wall of the groove and the smooth portion 212 is in smooth transition.

In this embodiment, as shown in fig. 2 and 6, the concave structure 211 may be a groove concavely arranged on the spindle sleeve 100, the bottom wall of the groove is an arc surface, and the side wall of the groove and the smooth portion 212 are in smooth transition, so that the resistance is smaller when the end of the plunger 300 slides into or slides out of the groove; when the plunger 300 slides on the smooth part, the smooth transition between the side wall of the groove and the smooth part is more beneficial to the end of the plunger 300 to slide into the groove, so that the head of the nuclear magnetic resonance host fixedly connected with the rotating shaft jacket 100 is hovered; when the head of the nuclear magnetic resonance host fixedly connected with the rotating shaft jacket 100 hovers, the plunger 300 is sunk in the groove, the bottom wall of the groove is an arc surface, the side wall of the groove and the smooth part 212 are in smooth transition, so that the resistance of the end of the plunger 300 sliding out of the groove can be reduced, and the resistance of re-rotating the head of the nuclear magnetic resonance host is reduced; when the user needs to rotate the head of the nuclear magnetic resonance host machine, the rotating shaft sleeve 100 is easier to rotate and is more convenient for the user to use.

In practical implementation, the radian of the circular arc of the bottom surface of the groove is matched with or is more gentle than the radian of the end of the plunger 300, and the smooth transition direction of the side wall of the groove and the smooth part 212 is opposite to the direction of the radian of the end of the plunger 300, so that the nose can be ensured to hover, and the plunger 300 is clamped in the groove, and meanwhile, the rotation resistance of the nose of the nuclear magnetic resonance host is reduced.

In one embodiment of the present utility model, the plungers 300 include a plurality of plungers, and the shaft housing 100 is provided with the through holes 140 corresponding to each plunger 300.

In this embodiment, as shown in fig. 2 and 5, the through hole 140 may be vertically penetrating the outer wall of the shaft casing 100, or may be penetrating the outer wall of the shaft casing 100 at any angle; when the through hole is vertically penetrated with the shaft housing 100, the required length of the plunger 300 is shortest, and the pressing against the shaft housing 100 is more sufficient.

Optionally, each recess 211 is disposed corresponding to a plunger 300. The recess structures 211 are disposed at intervals in the axial direction or in the circumferential direction on the outer wall of the fixing assembly 200, and correspondingly, the plungers 300 are also disposed at the same intervals in the axial direction or in the circumferential direction at corresponding positions of the shaft housing 100.

In this embodiment, as shown in fig. 2 and 5, each concave structure 211 corresponds to a plurality of plungers 300. The plungers 300 located at the same periphery as the recess 211 can be clamped into the recess 211 along with the rotation of the spindle sleeve 100, and at this time, the recess 211 can correspond to a plurality of plungers 300 at the same periphery; or, the recess structure 211 is an axially disposed groove, and the plurality of plungers 300 in the same axial direction can be clamped into the recess structure 211 when rotating along with the rotating shaft sleeve 100, and at this time, the recess structure 211 can correspond to the plurality of plungers 300 in the same axial direction. When the concave structures 211 are arranged, each plunger 300 is ensured to correspond to at least one concave structure 211; in practical implementation, the plungers 300 may be disposed corresponding to the number of the recess structures 211, and one plunger 300 may be disposed with one corresponding recess structure 211 as much as possible.

In an embodiment of the present utility model, the plurality of plungers 300 are arranged at intervals along the axial direction of the through cavity 110, and the concave structures 211 are grooves axially arranged along the outer side wall of the fixing structure 200, so that each concave structure 211 is arranged corresponding to the plurality of plungers 300.

In this embodiment, as shown in fig. 2, the plungers 300 may be arranged at intervals along the axial direction, and the concave structures 211 are grooves arranged along the axial direction of the outer side wall of the fixing structure 200, where one concave structure 211 may correspond to a plurality of grooves; the axially disposed grooves are at right angles to the rotational direction of the spindle housing 100, so that the hover resistance of the plunger 300 can be provided to the maximum extent, and the hover position of the spindle housing 100 is relatively fixed; the concave structure 211 is provided as a groove, so that a plurality of plungers 300 are conveniently arranged along the axial direction of the rotating shaft sleeve 100, and the friction force between the plungers 300 and the fixing assembly 200 is increased, so that the rotation resistance of the rotating shaft sleeve 100 is increased, and the nuclear magnetic resonance host machine head hovers in time.

In an embodiment of the present utility model, the plurality of plungers 300 are arranged at intervals along the circumferential direction of the through cavity 110, the recess structure 211 includes a plurality of recesses, and the plurality of recess structures 211 are disposed in one-to-one correspondence with the plurality of plungers 300.

In practical implementation, as shown in fig. 2 and 6, the grooves may be provided in one or more channels, and the depth and width of the grooves are equivalent to the dimensions of the end of the plunger 300. The concave structure 211 is provided with a groove, so that when the plunger 300 axially displaces, the plunger 300 can be clamped into the concave structure 211, and when the fastening of the plunger 300 is problematic, the rotating shaft structure can be used continuously in a short time; the plungers 300 may also be arranged at intervals along the circumferential direction of the through cavity 110, and the concave structures 211 are arranged in one-to-one correspondence with the plungers 300, so that more hovering angles of the rotating shaft jacket 100 can be realized under the condition that fewer plungers 300 are arranged. In practical implementation, the plungers 300 may be arranged at intervals along the outer side wall of the fixing structure 200, or may be arranged along the circumferential direction of the through cavity 110, or may be arranged along the outer side wall of the rotating shaft sleeve 210 at the same time in the axial direction and the circumferential direction; the plungers 300 are simultaneously arranged along the axial interval of the outer side wall of the fixing structure 200 and the circumferential direction of the through cavity 110, so that larger friction resistance can be provided when the rotating shaft outer sleeve 100 rotates, the rotating shaft outer sleeve 100 can hover in time, and the rotating shaft outer sleeve 100 can have more hover angles.

In an embodiment of the utility model, the recess structure 211 is a groove concavely formed on the outer wall of the fixing component 200.

In this embodiment, as shown in fig. 2 and 6, the grooves may be stripe grooves, hole grooves or grooves of other shapes. The recess structure 211 may also be a through groove formed on the outer wall of the fixing component 200, where the through groove is a groove with two ends penetrating through two end surfaces of the fixing component 200. The recess structure 211 may also be a through hole 140 formed in the fixing component 200, and the through hole 140 may be a groove-like structure, a hole-like structure or other morphological structures penetrating through the outer wall of the fixing component 200.

In an embodiment of the present utility model, the rotating shaft outer sleeve 100 has a first port 111 and a second port 112 that are communicated with the communication cavity 110, at least part of the structure of the fixing assembly 200 movably penetrates through the second port 112, the inner wall of the rotating shaft outer sleeve 100 is provided with a first step 120, and the first step 120 is disposed close to the first port 111; the rotating shaft structure further comprises a pressing block 400, the pressing block 400 is connected to the first step 120, the pressing block 400 is provided with a protrusion 410, and the fixing assembly 200 is provided with a limiting protrusion 213; when the rotating shaft outer sleeve 100 rotates one turn relative to the fixing assembly 200, the limiting protrusion 213 abuts against the protrusion 410, so that the rotating shaft outer sleeve 100 stops rotating in the original rotating direction.

In this embodiment, as shown in fig. 3 to 5, the spindle cover 100 may be provided with a boss near the first port 111, and the boss may be continuously disposed around the outer wall of the spindle cover 100, or disposed around the outer wall at intervals. The boss can be provided with a connecting hole, and the rotating shaft jacket 100 can be connected with a rotating piece, namely a nuclear magnetic resonance host machine head, through the connecting hole; the rotating shaft outer sleeve 100 is fixedly connected with the nuclear magnetic resonance host machine head, so that the rotating outer sleeve and the nuclear magnetic resonance host machine head can rotate coaxially and at the same rotating speed, and the synchronous rotating precision of the rotating shaft outer sleeve 100 and the nuclear magnetic resonance host machine head is ensured.

In practical implementation, the boss is far away from the axle center, and the connecting holes can be uniformly distributed circumferentially or closely distributed in multiple directions. The second port 112 with pivot overcoat 100 is worn to establish to the activity of fixed subassembly 200's part structure, the inner wall of pivot overcoat 100 is equipped with the first step 120 that is close to first port 111, first step 120 is used for connecting spacing briquetting 400, briquetting 400 detachably sets up on the step face of first step 120, briquetting 400 detachably sets up the fixed subassembly 200 of being convenient for installation, briquetting 400 has with the protruding 410 of spacing protruding 213 complex on the fixed subassembly 200, protruding 410 cooperatees with spacing protruding 213 can prevent the rotation angle of pivot overcoat 100 to exceed three hundred sixty degrees, avoid pivot overcoat 100 and connect to be that nuclear magnetic resonance host computer aircraft nose is rotated always to the same direction on pivot overcoat 100, prevent pivot overcoat 100 and fixed knot construct and be in coaxial position, cause pivot overcoat 100 and fixed knot construct's wearing and tearing.

In an embodiment of the present utility model, the fixing assembly 200 includes a rotating shaft sleeve 210 and a fixing aluminum tube 220, wherein the fixing aluminum tube 220 is fixedly sleeved in the rotating shaft sleeve 210, and the concave structure 211 and the smooth portion 212 are disposed on the outer side wall of the rotating shaft sleeve 210.

In this embodiment, as shown in fig. 2 and 6, the fixing assembly 200 includes a rotating shaft sleeve 210 and a fixing aluminum tube 220, the fixing aluminum tube 220 is a connecting piece between the rotating shaft sleeve 210 and the fixing end, and the rotating shaft sleeve 210 is a fixing piece in direct contact with the plunger 300; a boss can be arranged near the port of the rotating shaft sleeve 210, the boss is provided with a connecting hole, and the rotating shaft sleeve 210 can be connected with a fixing piece, namely a fixed aluminum pipe 220, through the connecting hole; in actual implementation, the boss is far away from the axle center, and the connecting holes can be uniformly distributed circumferentially or closely distributed in multiple directions; when the rotary shaft sleeve 210 is fixedly connected with the fixed aluminum pipe 220 to enable the rotary shaft outer sleeve 100 to rotate, the rotary shaft sleeve 210 is in a static state; the fixed assembly 200 is divided into the rotating shaft sleeve 210 and the fixed aluminum tube 220, which is beneficial to the maintenance and replacement of the fixed assembly 200; the rotating shaft sleeve 210 is used as a component in direct contact friction with the plunger 300, is easy to wear, such as the rotating shaft sleeve 210 is damaged, the rotating shaft sleeve 210 can be directly replaced, the whole fixing assembly 200 is not required to be replaced, the rotating shaft structure is easier to maintain, and the maintenance cost is lower.

In an embodiment of the present utility model, the inner wall of the spindle sleeve 100 is further provided with a second step 130, the second step 130 is disposed between the first step 120 and the second port 112, the spindle sleeve 210 is disposed between the press block 400 and the second step 130, and two ends of the spindle sleeve are respectively movably abutted to the step surface of the second step 130 and at least part of the bottom surface of the press block 400.

In this embodiment, as shown in fig. 2 to 5, the first step 120 and the second step 130 are sequentially arranged along the axial direction, and the arrangement of the first step 120 and the second step 130 on the inner wall of the rotating shaft outer sleeve 100 is beneficial to positioning and limiting components arranged in the rotating shaft outer sleeve 100. In practical implementation, the step sizes of the first step 120 and the second step 130 correspond to the components in the shaft housing 100, and the first step 120 and the second step 130 may be continuously disposed around the inner wall of the shaft housing 100, or may be intermittently disposed around the inner wall of the shaft housing 100.

The press block 400 is arranged on the step surface of the first step 120, the press block 400 can be provided with an extension part, the extension part of the press block 400 extends out of the step surface of the first step 120, a part of the press block 400 extending out of the step surface of the first step 120 is used for limiting, and a part of the press block 400 positioned on the step surface of the first step 120 is used for being detachably connected with the rotating shaft sleeve 100. In practical implementation, the pressing block 400 may be a circular solid block with a groove, or may be a circular solid block, and a part of the pressing block 400 extending out of the step surface of the first step 120 may be continuously arranged along the circumferential direction, or may be intermittently arranged along the circumferential direction.

The rotating shaft sleeve 210 is disposed between the second step 130 and the pressing block 400, and end surfaces at two ends of the rotating shaft sleeve 210 are respectively movably abutted against the step surface of the second step 130 and the bottom surface of the extension part. The rotating shaft sleeve 210 is limited between the second step 140 and the press block 400, and the end face of the rotating shaft sleeve 210 is abutted against the second step 130 and the press block 400, so that the rotating shaft sleeve 210 is more convenient to install, the rotating shaft sleeve 210 is relatively fixed at the through cavity 110 of the rotating shaft sleeve 100, the rotating shaft sleeve 100 and the rotating shaft sleeve 210 are coaxial as much as possible when the nuclear magnetic resonance host machine head rotates, and the situation that the nuclear magnetic resonance host machine head rotates with a virtual position is avoided. In practical implementation, the end surface of the rotating shaft sleeve 210 may continuously abut against the second step 130 and the extension portion, or may intermittently abut against the first step 140 and the extension portion; the shape of the abutment surface may be saw-tooth, wave-like, etc.

In an embodiment of the present utility model, the rotating shaft structure further includes a sealing ring 500, and the sealing ring 500 is sandwiched between the inner wall of the rotating shaft jacket 100 and the outer wall of the fixing assembly 200.

In this embodiment, as shown in fig. 2, a sealing ring 500 is disposed on the outer side wall of the rotating shaft sleeve 210, and the sealing ring 500 may be disposed by disposing a limiting groove in at least one of the inner wall of the rotating shaft sleeve 100 and the outer wall of the fixing assembly 200, where the sealing ring 500 is partially limited in the limiting groove and is in sealing abutment with the inner wall of the rotating shaft sleeve 100 and/or the outer wall of the fixing assembly 200. The seal ring 500 is used for blocking friction between the rotating shaft sleeve 100 and the rotating shaft sleeve 210 caused by the fact that the rotating shaft sleeve 100 and the rotating shaft sleeve 210 are not coaxial when the nuclear magnetic resonance host machine head rotates, so as to prevent the rotating shaft structure from being invalid. In practical implementation, two or more sealing rings 500 may be disposed on the outer side of the shaft sleeve 210, and the sealing rings 500 may be made of elastic rubber or plastic.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. A spindle structure, the spindle structure comprising:

the rotating shaft jacket is provided with a through cavity and a through hole connected with the through cavity;

the fixing component is movably arranged in the through cavity and is provided with a concave structure and a smooth part which are connected with each other;

the plunger penetrates through the through hole and is in butt joint with the outer wall of the fixing assembly;

when the rotating shaft outer sleeve rotates relative to the fixing assembly, the plunger is elastically abutted with the concave structure and the smooth part alternately.

2. The rotating shaft structure according to claim 1, wherein the plunger comprises a screw portion and a threaded portion arranged on the outer side of the screw portion, the threaded portion is made of weak magnetic stainless steel, and the screw portion is made of plastic.

3. The spindle construction as set forth in claim 1, wherein said recess is equally spaced about an outer sidewall of said stationary assembly;

and/or the concave structure is a groove concavely arranged on the outer side wall of the fixing component; the bottom wall of the groove is an arc surface; the side wall of the groove and the joint of the smooth part are in smooth transition.

4. The rotary shaft structure according to claim 1, wherein the plungers include a plurality of, and the rotary shaft housing is provided with the through hole corresponding to each of the plungers;

each concave structure is arranged corresponding to one plunger; or, each concave structure is arranged corresponding to a plurality of plungers.

5. The rotary shaft structure as claimed in claim 4, wherein the plurality of plungers are arranged at intervals along the axial direction of the through cavity, and the recess structure is a groove extending along the axial direction of the fixing assembly, so that each recess structure is arranged corresponding to the plurality of plungers;

and/or, a plurality of plungers are arranged at intervals along the peripheral direction of the through cavity, the concave structures comprise a plurality of concave structures, a plurality of concave structures are arranged at intervals along the peripheral direction of the through cavity, and the concave structures are arranged in one-to-one correspondence with the plungers.

6. The rotating shaft structure according to claim 1, wherein the concave structure is a groove concavely arranged on the outer wall of the fixed component;

or, the concave structure is a through groove arranged on the outer wall of the fixing component;

or, the concave structure is a through hole arranged on the fixing component.

7. The rotating shaft structure according to any one of claims 1 to 6, wherein the rotating shaft outer sleeve is provided with a first port and a second port which are communicated with the through cavity, at least part of the structure of the fixing assembly is movably arranged on the second port in a penetrating manner, the inner wall of the rotating shaft outer sleeve is provided with a first step, and the first step is arranged close to the first port;

the rotating shaft structure further comprises a pressing block, the pressing block is connected to the first step, the pressing block is provided with a protrusion, and the fixing assembly is provided with a limiting protrusion;

when the rotating shaft outer sleeve rotates for one circle relative to the fixing assembly, the limiting protrusion is abutted with the protrusion, so that the rotating shaft outer sleeve stops rotating towards the original rotating direction.

8. The rotary shaft structure according to claim 7, wherein the fixing assembly comprises a rotary shaft sleeve and a fixed aluminum pipe, the rotary shaft sleeve is sleeved on the outer wall of the fixed aluminum pipe and movably abuts against the inner wall of the through cavity, and the concave structure and the smooth portion are arranged on the outer side wall of the rotary shaft sleeve.

9. The rotary shaft structure according to claim 8, wherein a second step is further provided on an inner wall of the rotary shaft outer sleeve, the second step is disposed between the first step and the second port, the rotary shaft sleeve is disposed between the pressing block and the second step, and two ends of the rotary shaft sleeve are respectively movably abutted against the second step and the pressing block.

10. The rotary shaft structure according to any one of claims 1 to 6, further comprising a seal ring interposed between an inner wall of the rotary shaft housing and an outer wall of the fixing member.

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