CN211589670U - Polishing clamp - Google Patents

Abstract

The utility model relates to a polishing clamp, include: holding the body; the clamping mechanism comprises a limiting sleeve and a chuck; the limiting sleeve comprises a clamping end and a connecting end, the chuck is placed into the limiting sleeve from the clamping end and is pressed by the limiting sleeve, and the connecting end is connected with the holding body. The utility model utilizes the limit sleeve to press the chuck to fix the components in the chuck so as to clamp the femoral stem conical head around the circumferential direction, so that the femoral stem conical head keeps uniform stress and stable clamping in the circumferential direction, the error of polishing the surface of the femoral stem body can be reduced, and the parts are prevented from flying out of the hand; because the clamping mechanism can firmly clamp the femoral stem conical head and the femoral stem conical head is arranged in the chuck, the femoral stem conical head cannot be in contact with the polishing abrasive belt to be scratched.

Description

Polishing clamp

Technical Field

The utility model relates to a medical supplies processing field especially relates to polishing anchor clamps.

Background

The femoral stem is a commonly used prosthesis for recovering the normal function of the hip joint of a patient, and when the artificial joint replacement is carried out, the femoral stem is combined with a femoral head product and an acetabulum product to form a total hip or partial hip joint prosthesis, so the femoral stem product is an important component of the hip joint prosthesis.

In the manufacturing of the femoral stem product, the femoral stem needs to be polished to ensure the surface smoothness, no clamp specially used for polishing the femoral stem product exists at present, and most of the femoral stem products are polished manually, namely, the products are held by two hands to be polished.

In the actual polishing process, the abrasive belt is high in rotating speed and high in heat productivity, the difficulty degree of holding the femoral stem by two hands is increased, the processing surface error and even scrapping are easily caused by the fact that the two hands are not firmly held and uneven force is exerted, and once the part flies out of the hands, the risk of hurting people is caused. Meanwhile, as shown in fig. 1, the femoral stem product 1 is divided into a conical head 1-1 and a stem body 1-2, the stem body 1-2 needs to be polished, the conical head 1-1 needs to maintain machining dimensional accuracy, and the conical head is easy to contact with an abrasive belt to cause scratches due to difficult positioning during polishing.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a polishing jig for solving the problems that the femoral stem is not firmly held and the taper head is easily scratched when polishing.

A polishing jig comprising:

holding the body;

the clamping mechanism comprises a limiting sleeve and a chuck; the limiting sleeve comprises a clamping end and a connecting end, the chuck is placed into the limiting sleeve from the clamping end and is pressed by the limiting sleeve, and the connecting end is connected with the holding body.

The polishing clamp has the following beneficial technical effects:

the structure is simple, the limiting sleeve is utilized to press the chuck to fix the components in the chuck, so that the femoral stem conical head can be clamped around the circumferential direction, the stress of the femoral stem conical head is kept uniform in the circumferential direction, the clamping is stable, the clamp cannot shake in the polishing process, the error of polishing and processing the surface of the femoral stem body can be reduced, and the situation that the components fly out of the hand is avoided;

because the clamping mechanism can firmly clamp the femoral stem conical head all the time and the femoral stem conical head is arranged in the chuck, the femoral stem conical head cannot be in contact with the polishing abrasive belt to be scratched.

In one embodiment, the inner wall of the position limiting sleeve decreases in circumferential size in the direction from the clamping end to the connecting end so as to press the clamping head.

In one embodiment, the inner wall of the limiting sleeve is provided with a protrusion along the circumferential direction, and the protrusion abuts against the outer circumferential surface of the chuck.

In one embodiment, the clamping mechanism further comprises a screw rod for driving the chuck to be placed in the stop collar, the screw rod is rotatably arranged in the stop collar, and the screw rod is screwed into the chuck in a direction opposite to the placing direction of the chuck.

In one embodiment, the chuck comprises a spring jacket, a plurality of slits are arranged on the surface of the spring jacket, the slits are distributed on the surface of the spring jacket along the circumferential direction, and the extending direction of the slits is consistent with the axial direction of the spring jacket.

In one embodiment, the inner wall of the spring jacket is provided with a protective layer along the circumferential direction.

In one embodiment, the clamping mechanism is connected with the holding body through a connecting mechanism.

In one embodiment, the connection mechanism comprises:

the accommodating cavity is formed in the holding body and used for accommodating the connecting end;

the movable buckle is movably connected with the holding body, protrudes out of the inner wall of the accommodating cavity and props against the outer wall of the connecting end arranged in the accommodating cavity to fix the limiting sleeve.

In one embodiment, the connecting mechanism further comprises a clamping groove formed in the outer wall of the connecting end, and the movable buckle can be clamped into the clamping groove to fix the limiting sleeve.

In one embodiment, the connecting mechanism further includes an operating rod and a spring sleeved on the operating rod, the operating rod is inserted into the holding body from the outside and is connected with the movable buckle, one end of the spring abuts against the surface of the holding body, and the other end of the spring is fixed on the operating rod.

In one embodiment, the holding body comprises a detachable connector at an end, and the accommodating cavity is formed in the connector.

In one embodiment, the holding body is a holding handle, and the holding handle is a hollow structure.

Drawings

FIG. 1 is a schematic view of a femoral stem product;

fig. 2 is a front view of a polishing jig according to an embodiment of the present invention;

3 FIG. 3 3 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 A 3- 3 A 3 of 3 the 3 polishing 3 jig 3 shown 3 in 3 FIG. 32 3; 3

FIG. 4 is a cross-sectional view taken along line B-B of the polishing jig shown in FIG. 2;

FIG. 5 is an exploded view of the femoral stem clamped to the polishing jig of FIG. 2;

fig. 6 is a schematic view of the coupling mechanism of fig. 5 after half-cutting.

In the figure, 1, a femoral stem product, 1-1, a cone head, 1-2, a stem body,

100-a holding body, 110-a connector, 101-a threaded hole,

200-clamping mechanism, 210-limit sleeve, 211-clamping end, 212-connecting end, 220-clamping head, 221-spring jacket, 2211-gap, 230-screw rod,

300-femoral stem, 310-femoral stem conical head, 320-femoral stem handle body,

410-accommodating cavity, 420-movable buckle, 421-pin, 430-operating rod, 431-spring and 440-clamping groove.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Those of ordinary skill in the art will recognize that variations and modifications of the various embodiments described herein can be made without departing from the scope of the invention, which is defined by the appended claims. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 2-5, in one embodiment of the present invention, a polishing jig for holding a femoral stem 300 to perform polishing is provided. The polishing jig comprises a holding body 100 and a clamping mechanism 200 (please refer to fig. 5) connected with each other, wherein the clamping mechanism 200 is used for fixing a femoral stem awl head 310 of a femoral stem 300, and the holding body 100 can be conveniently held by an operator to polish a femoral stem body 320 for fixing the femoral stem 300.

The clamping mechanism 200 specifically comprises a limiting sleeve 210 and a clamping head 220, the limiting sleeve 210 comprises a clamping end 211 and a connecting end 212, the clamping head 220 is placed into the limiting sleeve 210 from the clamping end 211, the limiting sleeve 210 can clamp the components in the clamping head 220 by pressing the clamping head 220, and the connecting end 212 of the limiting sleeve 210 is connected with the holding body 100.

When the polishing tool is used specifically, the femoral stem taper head 310 is placed into the chuck 220, then the chuck 220 is placed into the limiting sleeve 210, the limiting sleeve 210 presses the chuck 220 tightly so as to firmly clamp the femoral stem taper head 310, and an operator can polish the femoral stem body 320 only by holding the holding body 100 in a hand. The utility model has simple structure, the limiting sleeve 210 is utilized to press the chuck 220 to fix the femoral stem conical head 310 in the chuck 220, so that the femoral stem conical head 310 can keep even stress and stable clamping in the circumferential direction, the clamp can not shake in the polishing process, the error of the surface polishing processing of the femoral stem body 320 can be reduced, and the situation that parts fly out of hands can be avoided;

since the fixture 200 can always firmly hold the femoral stem taper head 310 while the femoral stem taper head 310 is placed in the collet 220, the femoral stem taper head 310 is unlikely to contact the polishing sanding belt and be scratched.

In some embodiments, the inner wall of the stop collar 210 decreases in circumferential dimension in a direction from the gripping end 211 to the connecting end 212 to compress the collet 220, as shown in fig. 3. Because the inner diameter of the stop collar 210 is gradually reduced, in the process that the clamping head 220 is placed into the stop collar 210 from the clamping end 211, the stop collar 210 with the gradually reduced circumferential dimension of the inner wall can gradually compress the outer surface of the clamping head 220 to enable the outer surface to contract and deform along the radial direction, and then the femoral stem taper head 310 inside the clamping head 220 is clamped. It is understood that in other embodiments, the collet 220 may not deform when the stop collar 210 presses on the outer surface of the collet 220, and the pressure is transmitted to the femoral stem awl head 310 through the collet 220 to fix the head directly.

Of course, in other embodiments, the inner wall of the stop collar 210 may be provided with a protrusion along the circumferential direction, and the protrusion may abut against the outer circumferential surface of the collet 220. When the collet 220 is inserted into the stop collar 210 from the gripping end 211, the protrusions may abut against the outer circumferential surface of the collet 220 and compress the collet 220, and the collet 220 may be compressed by a force to secure the femoral stem taper head 310 within the collet 220.

During normal use, the collet 220 can be manually placed into the stop collar 210. To increase ease and labor, in some embodiments, the clamping mechanism 200 further includes a screw 230 coupled to the collet 220 for driving the collet 220 into the stop collar 210. The screw 230 can drive the chuck 220 to move and be placed in the limit sleeve 210, so that the operation is more convenient, and the labor amount is saved.

Referring specifically to fig. 3 and 5, in some embodiments, the screw 230 is pivotally disposed on the stop collar 210, and the screw 230 is threaded into the collet 220 in a direction opposite to the insertion direction of the collet 220. Since the chuck 220 cannot rotate relative to the position-limiting sleeve 210 due to the large friction force between the chuck 220 and the position-limiting sleeve 210, when the screw 230 rotates in place, the end threads of the screw are continuously screwed into the chuck 220, the chuck 220 moves in the insertion direction and completely enters the position-limiting sleeve 210 as the screwing length of the screw 230 increases, and the chuck 220 is pressed by the position-limiting sleeve 210 after being inserted into the position-limiting sleeve 210.

Referring to fig. 5, in some embodiments, the collet 220 includes a spring collet 221, and a plurality of slits 2211 are distributed on the surface of the spring collet 221 along the circumferential direction, and the slits 2211 extend in the axial direction of the spring collet 221. When the stop collar 210 contacts the surface of the collet 221, the collet 221 is compressed, the gap 2211 in the compressed surface of the collet 221 narrows and the diameter of the collet 221 decreases, thereby clamping the femoral stem head 310 inside.

Further, the inner wall of the spring jacket 221 is provided with a protective layer (not shown) along the circumferential direction. Femoral stem conical head 310 is arranged in spring holder 221 after, femoral stem conical head 310 surface and spring holder 221 inner wall direct contact can be avoided to the protective layer, the risk of unexpected fish tail femoral stem conical head 310 in the installation has been reduced, also can avoid leading to femoral stem conical head 310 surface to take place to warp owing to receiving spring holder 221 extrusion, and is concrete, the protective layer can adopt macromolecular material (PE) preparation, PE material surface is smooth, can perfectly laminate the product, can not fish tail femoral stem conical head 310 surface, and be elastic contact between protective layer and the femoral stem conical head 310 surface, the risk that takes place rigid contact and lead to deformation has been reduced. More preferably, the material of the spring jacket 221 is spring steel, which has high strength and can ensure strong and stable clamping.

In some embodiments, the gripping mechanism 200 is connected to the gripping body 100 by a connection mechanism. Because the clamping mechanism 200 can be detachably connected with the holding body 100 through the connecting mechanism, the clamping mechanism 200 can be detached after one femoral stem 300 is polished, and the next femoral stem 300 can be polished by connecting the other clamping mechanism 200 with the holding body 100, so that only one holding body 100 needs to be arranged during production, and the production input cost is saved.

Referring to fig. 4-6, in some embodiments, the connection mechanism includes a receiving cavity 410 and a movable catch 420. The receiving cavity 410 is formed in the grip body 100 and is used for receiving the connecting end 212. The movable buckle 420 is movably connected with the holding body 100, and the movable buckle 420 protrudes out of the inner wall of the accommodating cavity 410 and abuts against the outer wall of the connecting end 212 placed in the accommodating cavity 410 to fix the position-limiting sleeve 210.

Specifically, the movable buckle 420 can be connected with the holding body 100 through the pin 421, the connecting end 212 of the position limiting sleeve 210 is inserted into the accommodating cavity 410, and the movable buckle 420 is driven to protrude out of the inner wall of the accommodating cavity 410 and abut against the outer wall of the connecting end 212, so that the quick connection between the position limiting sleeve 210 and the holding body 100 can be realized; when the connection needs to be disconnected, the movable buckle 420 is driven reversely, so that the stop collar 210 and the holding body 100 can be separated.

As shown in fig. 6, as a preferred solution, the connection mechanism further includes a locking groove 440 disposed on an outer wall of the connection end 212, and the movable buckle 420 can be locked into the locking groove 440 to fix the position-limiting sleeve 210. After the movable buckle 420 is pressed against the slot 440 of the connecting end 212, the connection between the stop collar 210 and the holding body 100 is stable, and the stop collar and the holding body are not easily loosened. Preferably, the slot 440 is disposed around the circumference of the connection end 212.

Further, the connecting mechanism further includes an operating rod 430 and a spring 431 sleeved on the operating rod 430, the operating rod 430 is inserted into the holding body 100 from the outside and is connected with the movable buckle 420, one end of the spring 431 is pressed against the surface of the holding body 100, and the other end of the spring 431 is fixed on the operating rod 430.

Specifically, the operating rod 430 is pressed down to prevent the movable buckle 420 from protruding out of the inner wall of the accommodating cavity 410, the connecting end 212 of the position limiting sleeve 210 is inserted into the accommodating cavity 410, and the spring 431 is in a compressed state; when the operating rod 430 is released, the energy in the spring 431 is released and returned to the initial length, and at this time, the movable buckle 420 protrudes from the inner wall of the accommodating cavity 410 and abuts against the outer wall of the connecting end 212, and the stop sleeve 210 is connected with the holding body 100. When the connection is required to be disconnected, the operating rod 430 is pressed down to prevent the movable buckle 420 from protruding out of the inner wall of the accommodating cavity 410, at this time, the connecting end 212 of the position-limiting sleeve 210 can be taken out of the accommodating cavity 410, so that the position-limiting sleeve 210 is separated from the holding body 100, and the operating rod 430 is released after the position-limiting sleeve 210 is separated from the holding body 100.

In this embodiment, the quick connection and detachment of the clamping mechanism 200 and the holding body 100 can be realized by using the operating rod, the installation and detachment are completed by one key, the design is simple and practical, and the production and processing efficiency can be effectively improved.

Referring to fig. 5, in some embodiments, the receiving cavity 410 is formed on the connecting head 110 disposed at the end of the holding body 100, and the connecting head 110 is detachably disposed on the holding body 100. Specifically, after the connecting head 110 is inserted into the holding body 100, a fixing screw can be inserted through the threaded hole 101 of the holding body 100 from the outside and screwed into the connecting head 110, so as to fix the connecting head 110 on the holding body 100.

In this embodiment, since the connector 110 is detachably disposed on the holding body 100, when the connector 110 is damaged, the connector 110 is directly detached to replace the new connector 110, and the entire holding body 100 does not need to be replaced, thereby saving the cost.

Of course, in other embodiments, the connection mechanism may also adopt a common form of snap connection, thread butt joint, etc., as long as it can achieve quick connection and separation of the clamping mechanism and the holding body, which is not limited herein.

In some embodiments, the gripping body 100 is a gripping handle. During polishing, the femoral stem body 320 can be polished by the hand of the operator operating the holding handle.

It is understood that, in some other embodiments, the holding body 100 may be of other structures, such as a robot arm, and the holding mechanism 200 is disposed behind the robot arm, and the femoral stem awl head 310 is directly held by the robot for polishing without manual polishing, so as to further improve the working efficiency and save more time and labor.

In some embodiments, the gripping handle is a hollow structure. The gripping handle with the hollow structure reduces the whole weight, is light and flexible, and is convenient for an operator to hold.

It should be noted that, the polishing fixture described above can be used for clamping and polishing other products as required, besides being used for polishing the femoral stem, and the present invention is not limited thereto.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (11)

1. A polishing jig, comprising:

holding the body;

the clamping mechanism comprises a limiting sleeve and a chuck; the limiting sleeve comprises a clamping end and a connecting end, the chuck is placed into the limiting sleeve from the clamping end and is pressed by the limiting sleeve, and the connecting end is connected with the holding body.

2. A polishing chuck according to claim 1, wherein the inner wall of the retaining sleeve decreases in circumferential dimension in a direction from the holding end to the connecting end to compress the collet.

3. The polishing jig of claim 1, wherein the inner wall of the retainer sleeve is provided with a projection in a circumferential direction, the projection being abutted against the outer peripheral surface of the cartridge.

4. The polishing jig of claim 1, wherein the holding mechanism further comprises a screw for driving the cartridge into the retainer, the screw being rotatably provided in the retainer, and the screw being screwed into the cartridge in a direction opposite to a direction in which the cartridge is inserted.

5. The polishing fixture of claim 1, wherein the collet comprises a collet, and a plurality of slits are formed in the surface of the collet, and are circumferentially distributed on the surface of the collet, and extend in the same direction as the axial direction of the collet.

6. A polishing jig according to claim 5, wherein the inner wall of the spring jacket is provided with a protective layer in the circumferential direction.

7. The polishing chuck as set forth in claim 1, wherein the holding mechanism is connected to the holding body by a connecting mechanism, the connecting mechanism comprising:

the accommodating cavity is formed in the holding body and used for accommodating the connecting end;

the movable buckle is movably connected with the holding body, protrudes out of the inner wall of the accommodating cavity and props against the outer wall of the connecting end arranged in the accommodating cavity to fix the limiting sleeve.

8. A polishing jig according to claim 7, wherein the connecting mechanism further comprises a locking groove provided on an outer wall of the connecting end, and the movable buckle can be locked into the locking groove to fix the stop collar.

9. The polishing fixture as claimed in claim 7, wherein the connecting mechanism further comprises a lever and a spring sleeved on the lever, the lever is inserted into the holding body from the outside and connected with the movable buckle, one end of the spring is against the surface of the holding body, and the other end of the spring is fixed on the lever.

10. A polishing jig according to claim 7, wherein the gripping body comprises a detachable connector at an end, the receiving cavity being formed in the connector.

11. The buffing fixture of claim 1 wherein the gripping body is a gripping handle, the gripping handle being a hollow structure.

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