CN220560601U

CN220560601U - Floating type clamping tool for shaft parts

Info

Publication number: CN220560601U
Application number: CN202322235582.9U
Authority: CN
Inventors: 檀立杰; 郄鹏云; 余敢; 郭领洋; 虞俊
Original assignee: Nanjing Nanchuan Intelligent Technology Co ltd
Current assignee: Nanjing Nanchuan Intelligent Technology Co ltd
Priority date: 2023-08-18
Filing date: 2023-08-18
Publication date: 2024-03-08
Anticipated expiration: 2033-08-18

Abstract

The application provides a floating clamping tool for shaft parts, and relates to the technical field of clamping. The floating clamping tool for the shaft parts comprises a base, a force transmission mechanism, a center, a compression cover and a jacket; the force transmission mechanism is slidably arranged on the base and is used for being connected with a power source; the center is arranged on the base and is used for abutting against the end face of the workpiece; the compression cover is connected with the force transmission mechanism; the clamping sleeve is provided with a clamping space with adjustable size, and is slidably arranged on the base; the pressing cover is connected with the clamping sleeve and is used for pressing the clamping sleeve under the drive of the force transmission mechanism so as to reduce the clamping space and clamp the workpiece by the clamping sleeve. The tool can reduce the influence of radial force on a workpiece machining center when clamping a workpiece, ensure that a central hole of the workpiece is used as a reference, and improve the machining precision of the workpiece.

Description

Floating type clamping tool for shaft parts

Technical Field

The utility model relates to the technical field of clamping, in particular to a floating clamping tool for shaft parts.

Background

In the prior art, when a shaft part taking a central hole as a machining reference is subjected to hobbing, in order to ensure the machining precision and reduce the influence of concentricity of the central hole and the outer circle of a workpiece, two machining schemes are generally adopted, wherein one scheme is that the central hole needs to be polished and then is machined in an end face driving mode; the other scheme is that the excircle of the workpiece needs to be refined, and the excircle is processed in a clamping mode. Both schemes add working procedures, which is not beneficial to control of the manufacturing cost of the workpiece. In addition, when the hobbing of the small-sized shaft parts is carried out, the external dimension of the workpiece is smaller and limited by a space structure, the hobbing of the workpiece in an end face driving mode cannot be realized generally, the workpiece is generally processed by selecting a mode of clamping the outer circle of the workpiece, certain processing errors exist in the concentricity of the outer circle and the central hole of the workpiece due to the influences of processing precision and heat treatment deformation, and when the workpiece is clamped, clamping forces received by different positions of a clamping sleeve are different, so that the outer circle of the workpiece receives directional radial force, and centering precision of the central hole is influenced.

Disclosure of Invention

The utility model aims to provide a floating clamping tool for shaft parts, which can reduce the influence of radial force on a workpiece machining center when a workpiece is clamped, ensure that a central hole of the workpiece is taken as a reference, and improve the machining precision of the workpiece.

Embodiments of the present utility model are implemented as follows:

the utility model provides a floating clamping tool for shaft parts, which comprises the following components:

the device comprises a base, a force transmission mechanism, a center, a compression cover and a jacket;

the force transmission mechanism is slidably arranged on the base and is used for being connected with a power source; the center is arranged on the base and is used for abutting against the end face of the workpiece; the compression cover is connected with the force transmission mechanism; the clamping sleeve is provided with a clamping space with adjustable size, and the clamping sleeve is slidably arranged on the base; the pressing cover is connected with the clamping sleeve and is used for pressing the clamping sleeve under the drive of the force transmission mechanism so as to reduce the clamping space, and therefore the clamping sleeve clamps a workpiece.

In an alternative embodiment, the force transmission mechanism comprises a connecting rod, a floating connecting plate and a pull pin, wherein the connecting rod is provided with a first spherical part, the floating connecting plate is provided with a second spherical part, and the first spherical part is connected with the second spherical part to form a spherical hinge; the connecting rod is used for being connected with a power source; the floating connecting plate is slidably connected with the base, and the pull pin is simultaneously connected with the pressing cover and the floating connecting plate.

Based on the scheme, the power source is connected with the connecting rod, and can transmit pulling force to the floating connecting plate through the connecting rod, and then the pulling pin is transmitted to the pulling pin through the floating connecting plate, and the pulling pin drives the pressing cover to move, and the pressing cover applies force on the clamping sleeve, so that the clamping sleeve deforms, the clamping space is reduced, and the clamping sleeve is used for clamping the excircle of the workpiece. In the clamping process, the radial direction generated by the workpiece acts on the clamping sleeve and then is sequentially transmitted to the compression cover, the pull pin and the floating connecting plate through the clamping sleeve, so that the floating connecting plate is driven to rotate relative to the connecting rod, and the radial force of the tensioning force on the pull pin is reduced.

In an alternative embodiment, the first spherical portion is provided as a spherical joint, the second spherical portion is provided as a spherical connecting groove, and the spherical joint is embedded in the spherical connecting groove and is matched with the spherical joint in a rotatable manner.

Based on the scheme, the first spherical part and the second spherical part are simple in structure, convenient to process and manufacture, convenient to assemble and convenient for the floating connecting plate and the connecting rod to rotate in different directions in an adaptive mode.

In an alternative embodiment, the compression cover is provided with a fixing through hole, and the pull pin is inserted into the fixing through hole and fixedly connected with the compression cover.

Based on the scheme, the contact area of the pull pin and the compression cover is large, the assembly firmness is high, the pull pin is not easy to loosen, the operation is stable and reliable, and the force transmission is convenient.

In an alternative embodiment, the base comprises a clamping fixture body and a tip seat which are connected, a guide hole is formed in the tip seat, and the pull pin is slidably arranged in the guide hole in a penetrating manner; the center is fixed on the center seat.

Based on the scheme, the pull pin slides relative to the guide hole, the guide hole plays a role in guiding the pull pin, and the stability of the pull pin during sliding is high.

In an alternative embodiment, the pressing cover is provided with a first inclined plane, the clamping sleeve is provided with a second inclined plane, the first inclined plane is abutted with the second inclined plane, and the first inclined plane can apply force to the second inclined plane so as to enable the clamping sleeve to elastically deform inwards, so that the size of the clamping space is reduced.

Based on the scheme, after the force transmission mechanism applies the pulling force to the pressing cover, the first inclined surface of the pressing cover abuts against the second inclined surface of the clamping sleeve, the pulling force applied to the pressing cover along the extending direction of the axis of the center can be converted into radial force for driving the clamping sleeve to radially deform, the reduction of the clamping space of the clamping sleeve is facilitated, and therefore the clamping sleeve is facilitated to clamp a workpiece positioned in the clamping space.

In an alternative embodiment, a bearing is arranged between the jacket and the base, a retainer of the bearing is fixedly connected with the base, and the jacket is slidably connected with balls of the bearing.

Based on the scheme, through setting up the bearing, reduce the frictional force that receives when pressing from both sides the cover and slide for the base, press from both sides the cover slip more nimble.

In an alternative embodiment, a gasket is arranged between the jacket and the ball, the gasket is fixedly connected with the jacket, and the gasket is slidably connected with the ball.

Based on the scheme, the gasket is in direct contact with the ball, so that abrasion of the jacket is slowed down, and stability and reliability of clamping of the jacket are not easily affected.

In an alternative embodiment, an elastic element is arranged between the compression cover and the gasket, and the elastic element is used for enabling the compression cover to have a movement trend away from the jacket.

Based on the scheme, after the clamping force applied to the jacket is withdrawn, the pressing cover can return to the initial position under the action of the elastic piece, so that the next use is facilitated.

In an alternative embodiment, the pressing cover is provided with a mounting groove, the elastic piece is inserted in the mounting groove, one end of the elastic piece is abutted to the bottom wall of the mounting groove, and the other end of the elastic piece is abutted to the gasket.

Based on the scheme, locate the elastic component in the mounting groove, the elastic component is restricted by the cell wall of mounting groove, and the compression and the tensile of elastic component are all in the groove depth direction of mounting groove, and the elastic component can provide stable elasticity.

The embodiment of the utility model has the beneficial effects that:

in summary, in the floating clamping tool for shaft parts provided in this embodiment, a workpiece is inserted into a clamping space, a center hole on an end portion of the workpiece is matched with a center, then, a force transmission mechanism is connected with a power source such as a hydraulic press, the power source inputs power to the force transmission mechanism, the force transmission mechanism drives a compression cover to move, the compression cover drives a jacket to move, the clamping space is reduced until the jacket is clamped on an outer circular surface of the workpiece, and clamping of the workpiece is completed. In the process of clamping the workpiece, when the outer circle and the central hole of the workpiece are not concentric, different positions of the jacket start to receive the reaction force of the workpiece at different times, and the jacket is slidably connected with the base, so that the jacket can generate small-amplitude displacement in the radial direction taking the center as the center; the radial force of the jacket on the outer circle of the workpiece is reduced, so that the influence on the centering precision of the workpiece is reduced, the positioning precision of the workpiece is improved, and the workpiece processing is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a floating clamping tool for shaft parts according to an embodiment of the present utility model.

Icon:

100-base; 110-a mould body; 111-a receiving groove; 112-avoiding the through hole; 120-center seat; 121-a guide hole; 200-a force transmission mechanism; 210-connecting rods; 211-a first spherical portion; 220-floating connection plates; 221-a second spherical portion; 230-pulling a pin; 300-center; 400-pressing the cover; 410-a central hole; 420-fixing through holes; 430-a first ramp; 440-mounting slots; 450-elastic member; 500-jacket; 510—a clamping space; 520-a second ramp; 600-spacers; 700-bearing; 710-a cage; 720-balls.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected 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: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "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; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, in this embodiment, a floating clamping tool for shaft parts includes a base 100, a force transmission mechanism 200, a center 300, a pressing cover 400, and a jacket 500; force transfer mechanism 200 is slidably mounted to base 100 for connection to a power source; the center 300 is mounted on the base 100 and is used for abutting against the end face of the workpiece; the compression cover 400 is connected with the force transmission mechanism 200; the clamping sleeve 500 is provided with a clamping space 510 with adjustable size, and the clamping sleeve 500 is slidably arranged on the base 100; the pressing cover 400 is connected to the collet 500, and the pressing cover 400 is used for pressing the collet 500 under the driving of the force transmission mechanism 200, so that the clamping space 510 is reduced, and the collet 500 clamps the workpiece.

Based on the above technical scheme, the working principle of the floating clamping tool for shaft parts provided by the embodiment is as follows:

in use, the force transfer mechanism 200 is first adjusted to be in a state of not pressing the jacket 500, and at this time, the holding space 510 maintains a larger area, so that workpieces with different outer diameter sizes can be placed. After the clamping space 510 is adjusted, one end of the workpiece is inserted into the clamping space 510, the center hole 410 on the end of the workpiece is inserted into the center 300, and then the force transmission mechanism 200 is connected with a power source such as a hydraulic machine. The power source is started, the power source inputs power to the force transmission mechanism 200, the force transmission mechanism 200 drives the compression cover 400 to move, the compression cover 400 drives the clamping sleeve 500 to move, the clamping space 510 is reduced until the clamping sleeve 500 is clamped on the outer circular surface of the workpiece, and the clamping of the workpiece is completed. When the outer circle of the workpiece and the central hole 410 are not concentric in the process of clamping the workpiece, different positions of the jacket 500 start to receive the reaction force of the workpiece at different times, and by arranging the jacket 500 in slidable connection with the base 100, small-amplitude displacement of the jacket 500 in the radial direction with the center 300 as the center can be realized; radial force of the jacket 500 on the outer circle of the workpiece is reduced, so that influence on centering accuracy of the workpiece is reduced, positioning accuracy of the workpiece is improved, and workpiece machining is facilitated.

The following embodiment is used for expanding and describing the detailed structure of the floating clamping tool for the shaft parts.

In this embodiment, the base 100 may optionally include a mold body 110 and a tip seat 120 connected to each other. An accommodating groove 111 is formed in one side surface of the mold body 110, an avoidance through hole 112 is formed in the bottom wall of the accommodating groove 111, and the accommodating groove 111 and the avoidance through hole 112 can be coaxially arranged. The tip seat 120 is abutted at the notch of the accommodating groove 111, and the tip seat 120 and the mold body 110 can be fixedly connected by adopting fasteners such as screws. The tip seat 120 is provided with a guide hole 121, the guide hole 121 is communicated with the accommodating groove 111, the guide hole 121 can be a circular through hole, the number of the guide holes 121 is set according to needs, and the embodiment is not limited specifically. When the number of the guide holes 121 is plural, the plural guide holes 121 are uniformly arranged at intervals in the circumferential direction of the avoidance through hole 112. And, the center seat 120 is provided with a slot at a side middle part facing away from the mould body 110, and the center 300 is inserted and fixed in the slot. The axis of the tip 300, the axis of the receiving groove 111, and the axis of the escape through hole 112 are collinear. And the axis of the guide hole 121 is arranged in parallel with the axis of the tip 300.

In this embodiment, force transfer mechanism 200 optionally includes a connecting rod 210, a floating connecting plate 220, and a pull pin 230. One end of the connection rod 210 is provided with a first spherical portion 211, and the first spherical portion 211 may be a spherical joint. The second spherical portion 221 is disposed at a middle position of the floating connection plate 220, the second spherical portion 221 may be a spherical connection groove, the first spherical portion 211 and the second spherical portion 221 are rotatably matched, and the first spherical portion 211 and the second spherical portion 221 form a spherical hinge, so that the connection rod 210 can rotate in multiple directions relative to the floating connection plate 220, and the rotation is flexible. It should be appreciated that in other embodiments, the first spherical portion 211 may be a spherical groove, and the second spherical portion 221 may be a spherical head that mates with the spherical groove, capable of forming a spherical hinge. The number of the pull pins 230 can be multiple, the number of the pull pins 230 is equal to the number of the guide holes 121 and corresponds to one, each pull pin 230 is slidably arranged in the corresponding guide hole 121 in a penetrating manner, the guide holes 121 guide the pull pins 230 to slide, and the pull pins 230 slide stably and reliably. And, the inside of each pull pin 230 is provided with a clamping groove, the outer Zhou Tongshi of the floating connecting plate 220 is clamped in the clamping grooves of the plurality of pull pins 230, and the floating connecting plate 220 and the pull pins 230 are firmly fixed. During assembly, the mold body 110 and the center seat 120 can be separated, the floating connecting plate 220 is placed in the accommodating groove 111, the connecting rod 210 extends out of the avoidance through hole 112, the guide hole 121 of the center seat 120 is aligned with the pull pin 230, the center seat 120 is slidably connected with the pull pin 230, and after the center seat 120 is in butt joint with the mold body 110, the center seat 120 is fixed on the mold body 110, so that the assembly is convenient.

It should be appreciated that the connector rod 210 may be removably coupled to the power source via a flange or the like.

In this embodiment, optionally, a central hole 410 is provided in the middle of the pressing cover 400, and the hole wall of the central hole 410 is a first inclined plane 430, and the first inclined plane 430 may be a conical surface. Meanwhile, the compression cover 400 is further provided with fixing through holes 420, the number of the fixing through holes 420 is equal to that of the guide holes 121 and opposite to each other, and the pull pins 230 are arranged in the corresponding fixing through holes 420 in a penetrating manner and fixedly connected with the compression cover 400. The pull pin 230 is tightly attached to the hole wall of the fixing through hole 420, the contact area is large, and the pull pin 230 is firmly and reliably matched with the compression cover 400. And, the pressing cover 400 is provided with a plurality of mounting grooves 440 at a side surface near the center base 120, the groove depth of each mounting groove 440 is the same as the axial direction of the center hole 410, the plurality of mounting grooves 440 are uniformly spaced around the center hole 410, and the plurality of mounting grooves 440 are located between the center hole 410 and the fixing through hole 420. An elastic member 450 is inserted into each mounting groove 440, and the elastic member 450 may be, but is not limited to, a spring.

In this embodiment, alternatively, the outer circumferential surface of the jacket 500 has a second inclined surface 520, and the second inclined surface 520 may be a partial conical surface. The jacket 500 may include an integral annular body and a plurality of clamping arms, where the clamping arms are located on an annular end surface of the annular body, and the clamping arms are uniformly spaced apart in a circumferential direction of the annular body and cooperate to form a clamping space 510. The outer side of each clamping arm is provided as a second bevel 520. The pressing cover 400 can simultaneously abut against the plurality of clamping arms to drive the plurality of clamping arms to deform inwards to reduce the size of the clamping space 510. Meanwhile, an annular gasket 600 is mounted on an end surface of the annular body, which is far away from the clamping arm, a bearing 700 is mounted between the gasket 600 and the tip seat 120, a retainer 710 of the bearing 700 is fixed on the tip seat 120, and balls 720 of the bearing 700 are in contact with the gasket 600. And, the thimble passes through the bearing 700 and the gasket 600, and a part of the thimble stretches into the clamping space 510, so that the thimble is convenient to be matched with a workpiece. So designed, when clamping the workpiece, the collet 500 and the gasket 600 can slide relative to the balls 720 with little friction and flexible sliding. And the gasket 600 contacts the balls 720 to reduce wear of the collet 500.

It should be appreciated that when the pressing cover 400 is matched with the collet 500 and the first inclined surface 430 abuts against the second inclined surface 520, the collet 500 cannot approach the tip seat 120 due to the abutment of the collet 500 with the tip seat 120, but the collet 500 is retracted inwards, so as to clamp the workpiece when the pressing cover 400 drives the collet 500 to move near the tip seat 120. In this process, the elastic member 450 is compressed to have an elastic force to move the pressing cover 400 away from the collet 500, thereby facilitating the returning of the pressing cover 400 to the initial position after the external force applied to the pressing cover 400 is removed, and facilitating the next clamping of the workpiece. Because the elastic member 450 is limited by the mounting groove 440, the elastic force generated when the elastic member 450 is deformed is basically in the groove depth direction of the mounting groove 440, that is, the elastic force generated by the elastic member 450 is basically in the axis extending direction of the center 300, the deformation of the elastic member 450 is stable, and the elastic member 450 can provide stable elastic force, so that the elastic member 450 can jack up the compression cover 400.

According to the floating clamping tool for the shaft parts, provided by the embodiment, through the spherical hinge matching of the floating connecting plate 220 and the connecting rod 210 and the sliding matching of the jacket 500 and the center seat 120, the influence of radial force on a workpiece machining center when a workpiece is clamped can be reduced, the center hole 410 of the workpiece is ensured to serve as a reference, the machining precision of the workpiece is improved, the high-precision machining of the shaft parts is realized in a mode of not trimming the center hole 410 and carrying out cylindrical grinding, the machining procedure is reduced, and the machining efficiency is improved.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A floating centre gripping frock of axle type part, its characterized in that includes:

2. The floating clamping tool for shaft parts according to claim 1, wherein:

the force transmission mechanism comprises a connecting rod, a floating connecting plate and a pull pin, wherein the connecting rod is provided with a first spherical part, the floating connecting plate is provided with a second spherical part, and the first spherical part is connected with the second spherical part to form a spherical hinge; the connecting rod is used for being connected with a power source; the floating connecting plate is slidably connected with the base, and the pull pin is simultaneously connected with the pressing cover and the floating connecting plate.

3. The floating clamping tool for shaft parts according to claim 2, wherein:

the first spherical part is arranged as a spherical connector, the second spherical part is arranged as a spherical connecting groove, and the spherical connector is embedded into the spherical connecting groove and is matched with the spherical connecting groove in a rotatable manner.

4. The floating clamping tool for shaft parts according to claim 2, wherein:

the pressing cover is provided with a fixing through hole, and the pull pin is arranged in the fixing through hole in a penetrating mode and fixedly connected with the pressing cover.

5. The floating clamping tool for shaft parts according to claim 2, wherein:

the base comprises a clamping fixture body and a center seat which are connected, a guide hole is formed in the center seat, and the pull pin is slidably arranged in the guide hole in a penetrating mode; the center is fixed on the center seat.

6. The floating clamping tool for shaft parts according to claim 1, wherein:

the clamping cover is provided with a first inclined plane, the clamping sleeve is provided with a second inclined plane, the first inclined plane is in butt joint with the second inclined plane, and the first inclined plane can apply force to the second inclined plane so that the clamping sleeve can elastically deform inwards, and therefore the size of the clamping space is reduced.

7. The floating clamping tool for shaft parts according to claim 1, wherein:

the bearing is arranged between the jacket and the base, the retainer of the bearing is fixedly connected with the base, and the jacket is slidably connected with the balls of the bearing.

8. The floating clamping tool for shaft parts according to claim 7, wherein:

and a gasket is arranged between the jacket and the ball, the gasket is fixedly connected with the jacket, and the gasket is slidably connected with the ball.

9. The floating clamping tool for shaft parts according to claim 8, wherein:

an elastic piece is arranged between the pressing cover and the gasket and used for enabling the pressing cover to have a movement trend away from the jacket.

10. The floating clamping tool for shaft parts according to claim 9, wherein:

the compression cover is provided with a mounting groove, the elastic piece is inserted into the mounting groove, one end of the elastic piece is abutted to the groove bottom wall of the mounting groove, and the other end of the elastic piece is abutted to the gasket.