CN112894413A

CN112894413A - Valve self-centering tool clamp and operation method

Info

Publication number: CN112894413A
Application number: CN202110340093.2A
Authority: CN
Inventors: 邵宣忠; 林深
Original assignee: Suzhou Mingjiang Valve Equipment Co ltd
Current assignee: Suzhou Mingjiang Valve Equipment Co ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-06-04

Abstract

The invention discloses a valve self-centering tool clamp and an operation method, wherein a valve is provided with a through hole, the tool clamp comprises a mounting seat, at least one self-centering mechanism, a first driving mechanism and a second driving mechanism, the mounting seat comprises a main body part and a transmission mechanism with a transmission shaft, and the self-centering mechanism is connected with the transmission shaft; the self-centering mechanism comprises two torsion limiters, two end face thread discs and a plurality of jacking mechanisms, and the mounting seat enters the through hole of the valve to be machined to do linear motion under the driving of the first driving mechanism until the mounting seat reaches a preset position; under the drive of the second driving mechanism, the transmission shaft rotates to drive the torque limiter to rotate, the torque limiter rotates to drive the two end face thread discs to rotate in the same direction, and then the plurality of jacking mechanisms are driven to move towards the direction close to the inner wall of the valve through hole until the jacking mechanisms abut against the inner wall of the valve through hole, and the axial lead of the transmission shaft coincides with the reference of the valve through hole. The valve self-centering tool clamp provided by the invention realizes a larger clamping stroke, reliable clamping torque and self-locking capability.

Description

Valve self-centering tool clamp and operation method

Technical Field

The invention relates to the field of machine manufacturing, in particular to a valve self-centering tool clamp and an operation method.

Background

When cast and forged symmetrical parts are machined, production machining is basically carried out in a mode of manual surface printing, correction and clamping; generally, such parts are mostly small-quantity multi-batch parts or large-quantity multi-batch parts; therefore, the clamping device can clamp such parts quickly and efficiently, and has great significance for improving the production quality, improving the production efficiency, reducing the production cost and reducing the labor intensity of workers.

The clamping correction of a symmetrical special blank part is carried out, and a single-action adjustable four-jaw chuck is mostly adopted for clamping correction of a workpiece, because the chuck has large adjustable freedom degree and simple and reliable structure; but the correction is cumbersome; and four claws move singly, a screw rod is arranged in each claw, and when one screw rod is screwed, only one claw can move, and self-centering cannot be realized.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a valve self-centering tool clamp and an operation method, wherein the technical scheme is as follows:

on one hand, the invention provides a valve self-centering tool clamp, wherein the valve is provided with a through hole, the tool clamp is used for positioning the reference of the through hole of the valve, the tool clamp comprises a mounting seat, at least one self-centering mechanism, a first driving mechanism and a second driving mechanism, the mounting seat comprises a main body part and a transmission mechanism arranged in the main body part, the transmission mechanism comprises a transmission shaft, and the self-centering mechanism is connected with the transmission shaft;

each self-centering mechanism comprises two torsion limiters sleeved outside the transmission shaft, two oppositely-arranged end face threaded discs arranged between the two torsion limiters, and a plurality of tightening mechanisms arranged between the two end face threaded discs, each tightening mechanism moves relative to the center of each end face threaded disc, the end face threaded discs correspond to the torsion limiters one by one and are fixedly connected with the torsion limiters, and the transmission shaft, the torsion limiters and the end face threaded discs are coaxially arranged;

the mounting seat is provided with an opening at the side wall corresponding to each jacking mechanism, and the outer end part of each jacking mechanism always extends out of the opening;

under the drive of the first driving mechanism, the mounting seat enters the through hole of the valve to be processed to do linear motion until reaching a preset position;

under second actuating mechanism's the drive, be located preset position the transmission shaft of mount pad rotates in order to drive the torque limiter rotates, the torque limiter rotates and drives two the terminal surface screw thread dish syntropy rotates, and then drives a plurality ofly push up tight mechanism and remove until its equal conflict inner wall to the inner wall direction that is close to the valve through-hole, and make the axial lead and the valve through-hole benchmark of transmission shaft coincide.

Further, the jacking mechanism comprises a jacking claw in threaded connection with the end face threaded disc.

Further, the jacking mechanism further comprises a jacking head in threaded connection with the jacking claw, and the jacking head is used for abutting against the inner wall of the valve through hole.

Furthermore, an end face thread is formed on the end face thread disc, thread teeth matched with the end face thread are arranged outside the top claw, and the end face thread disc is in threaded connection with the top claw.

Furthermore, the number of the jacking mechanisms is four, the axial leads of two oppositely arranged jacking mechanisms are overlapped, the axial leads of the other two oppositely arranged jacking mechanisms are overlapped, and when the transmission shaft rotates, the two oppositely arranged jacking mechanisms move reversely.

Furthermore, the outer circumferential wall of one end of the ejector head is provided with an external thread matched with the internal thread of the ejector claw, and the other end of the ejector head is of a cylindrical structure.

Further, the top claw is of a square structure.

Further, the tightening mechanism is detachably arranged between the two end face threaded discs.

On the other hand, the invention also provides a method for positioning the valve through hole reference by using the valve self-centering tool clamp, which comprises the following steps:

s1, driving the mounting seat to enter the through hole of the valve to be processed to do linear motion by using the first driving mechanism until the mounting seat reaches a preset position;

s2, driving a transmission shaft of the mounting seat located at a preset position to rotate by using a second driving mechanism so as to drive two torque limiters to rotate, wherein the torque limiters rotate to drive two end face thread discs to rotate in the same direction, and further drive a plurality of tightening mechanisms to move towards the direction close to the inner wall of the valve through hole until the tightening mechanisms are all abutted against the inner wall, and the axis of the transmission shaft is enabled to be coincident with the reference of the valve through hole;

and S3, after the machining is finished, driving the transmission shaft to rotate by using the second driving mechanism to enable the jacking mechanism to return, and then providing backward driving force to enable the mounting seat to integrally move backward until the mounting seat is withdrawn from the through hole of the valve, wherein the rotating direction of the transmission shaft in the step S3 is opposite to the rotating direction of the transmission shaft in the step S2.

Further, in step S2, after the two tightening mechanisms disposed opposite to each other abut against the inner walls corresponding to the valve through holes, the torsion forces on the torsion limiters corresponding to the two tightening mechanisms continue to rise until the torsion forces are greater than the torsion limit values, and the torsion limiters operate to protect and separate.

The technical scheme provided by the invention has the following beneficial effects:

a. the invention provides a valve self-centering tool clamp which can self-center, and realize larger clamping stroke, reliable clamping torque and self-locking capability;

b. the valve self-centering tool clamp provided by the invention can be used in a single group or in two or more groups simultaneously (can be adjusted and manufactured according to products); the workpiece is simple and convenient to clamp and reliable in action; the production cost is low, and the production is easy;

c. the valve self-centering tool clamp provided by the invention can be used for self-positioning valves with different inner diameters, and has universality;

d. the operation method of the valve self-centering tool clamp provided by the invention is simple to operate, short in processing time and high in production efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a cut-away perspective view of a valve self-centering tooling fixture provided by an embodiment of the present invention;

FIG. 2 is an enlarged view of FIG. 1;

FIG. 3 is a cross-sectional view of a valve self-centering tool fixture provided by an embodiment of the present invention;

FIG. 4 is a perspective view of an end face threaded disk of a valve self-centering tooling fixture provided in an embodiment of the present invention;

FIG. 5 is a perspective view of a top jaw of a valve self-centering tooling fixture provided in an embodiment of the present invention;

FIG. 6 is a perspective view of a plug of a valve self-centering tool fixture provided by an embodiment of the present invention;

FIG. 7 is a perspective view of a valve provided by an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a through-hole reference line of a valve provided by an embodiment of the present invention;

FIG. 9 is a cross-sectional view of the B and C datum planes of a valve provided by an embodiment of the present invention;

FIG. 10 is a first schematic diagram of a valve self-centering tool fixture positioning valve provided in accordance with an embodiment of the present invention;

fig. 11 is a second schematic diagram of a valve self-centering tool fixture positioning valve according to an embodiment of the present invention.

Wherein the reference numerals include: the device comprises a valve 1, a through hole 11, a through hole datum line 12-B, a datum line 13-C, a flange 14, an end flange 15, a main body 2, a transmission shaft 3, a torque limiter 4, an end face threaded disc 5, a jacking claw 6, a jacking head 7 and a fixed flange 8.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.

The invention provides an irregular symmetrical part of a processing object of a valve self-centering tool clamp, in particular to a valve with a through hole, which is shown in a figure 7, a figure 8 and a figure 9, wherein the valve is provided with two communicated flanges 14 and one end 15, the two flanges 14 are provided with the through hole, the end is provided with an opening, and the vertical section of the opening is similar to an ellipse. The valve through hole is deformed after casting, the deformed valve through hole is not a regular round hole, and the shape of the valve through hole is similar to an ellipse. Because the through hole is formed by casting, the roundness and the surface of the through hole cannot be directly defined as the A standard; the positioning efficiency cannot be improved by the traditional mode.

In an embodiment of the present invention, a valve self-centering tooling fixture is provided, as shown in fig. 1 to 3, the tooling fixture is used for positioning a valve through hole datum 11, referred to as an a datum for short, and after the a datum is determined, a B datum 12 and a C datum 13 are corrected, or rough and finish machining of two flanges are used as auxiliary fine datum.

The specific structure of the tool clamp is as follows: it includes mount pad, at least one from centering mechanism, first actuating mechanism and second actuating mechanism, the mount pad includes main part 2 and sets up drive mechanism in the main part 2, drive mechanism includes transmission shaft 3, from centering mechanism and transmission shaft 3 connection, transmission shaft 3 arranges the mount pad center in and can carry out free rotary motion, main part 2 is outer shell seat.

The specific structure of each self-centering mechanism is as follows: the two-end-face torque limiter mechanism comprises two torque limiters 4 arranged outside a transmission shaft 3, two end-face thread discs 5 arranged between the two torque limiters 4, and a plurality of jacking mechanisms arranged between the two end-face thread discs 5, wherein the two torque limiters 4 are arranged at intervals, the end-face thread discs 5 correspond to the torque limiters 4 one by one and are fixedly connected, namely, the end-face thread discs 5 are fixedly connected with the adjacent torque limiters 4.

The central motion of the relative terminal surface screw thread dish 5 of each tight mechanism in top, the tight mechanism in top with 5 looks sliding connection of terminal surface screw thread dish, a plurality of tight mechanisms in top round the preferred evenly distributed of hoop of terminal surface screw thread dish 5, the tight mechanism in top is preferred to be set up to four, and the axial lead coincidence of two tight mechanisms in top that set up relatively, the axial lead coincidence of two other tight mechanisms in top that set up relatively, every two adjacent tight mechanisms in top promptly sets up perpendicularly, and when the transmission shaft rotated, two tight mechanism reverse movement in top that set up relatively (this two tight mechanisms in top removed simultaneously). The transmission shaft 3, the torque limiter 4 and the end face threaded disc 5 are coaxially arranged.

The mounting seat is provided with an opening at the side wall corresponding to the jacking mechanism, and the outer end part of the jacking mechanism always extends out of the opening.

Under the drive of the first driving mechanism, the mounting seat enters the through hole of the valve 1 to be processed to do linear motion until reaching a preset position; under second actuating mechanism's the drive, be located preset position the transmission shaft 3 of mount pad rotates in order to drive torque limiter 4 rotates, torque limiter 4 rotates and drives two 5 syntropies of terminal surface screw dish rotate, and then drive a plurality of tight mechanism in top removes to the inner wall direction that is close to 1 through-hole of valve (promptly to keeping away from terminal surface screw dish central direction motion) until a plurality of tight mechanism in top all conflicts the inner wall, and makes the axial lead of transmission shaft 3 and the 11 coincidences of valve through-hole benchmark define out the through-hole benchmark promptly when pressing from both sides tight valve.

The jacking mechanism has the following specific structure: it include with 5 threaded connection's of terminal surface screw thread dish top claw 6 and with 6 threaded connection's top 7 is pushed up to claw, top 7 be used for with the inner wall of 1 through-hole of valve is contradicted. When the inner diameter of the valve through hole is larger, only the ejector head 7 with longer length needs to be replaced, and the whole self-centering mechanism does not need to be replaced.

The end face thread disc 5 is provided with end face threads (see fig. 4) on the surface close to the adjacent end face thread disc 5, one outer side wall of the top claw 6 is provided with thread teeth matched with the end face threads, the end face thread disc 5 is in threaded connection with the top claw 6, and the end face thread disc 5 and the top claw 6 are matched with each other to form spiral transmission.

The top claw 6 has the following specific structure: referring to fig. 5, it is preferably a cube structure, the center is provided with an opening with internal thread, and one outer side wall of the top jaw 6 is provided with screw teeth.

The outer circumferential wall of the one end of the top head 7 is provided with an external thread matched with the internal thread of the top claw 6, the other end of the top head is of a cylindrical structure, and the top head 7 is in threaded connection with the top claw 6. The top jaw 6 is in clearance fit with the mounting seat, see fig. 6.

Preferably, the tightening mechanism can be detachably arranged between the two end face threaded discs 5, so that the tightening mechanism is convenient to detach and replace.

The working principle of the valve self-centering tool clamp provided by the invention is as follows: the transmission shaft is provided with directional power, so that the transmission shaft rotates, the transmission shaft rotates to drive the torque limiter connected with the transmission shaft and the end face threaded disc assembled on the torque limiter to rotate, the rotating force is converted into linear motion of the top claw by the top claw matched with the end face threaded disc, specifically, the end face thread on the end face threaded disc is a single-thread uniform-pitch thread, the top claw is provided with a corresponding thread line, when the end face threaded disc rotates, the top claw matched with the end face threaded disc is driven to perform displacement change (the top claw matched with the end face threaded disc performs centripetal or centrifugal motion with certain displacement), and the top claw only can change spiral rotation into linear motion due to relative matching constraint of the mounting seat. Referring to fig. 1, when the transmission shaft rotates, two oppositely arranged top claws move in opposite directions (one top claw moves upwards (forward movement) and the other top claw moves downwards (backward movement)), the two top claws can move equidistantly relative to the center of the end-face threaded plate, namely the two top claws have the same stroke, and similarly, the other two oppositely arranged top claws move equidistantly relative to the center of the end-face threaded plate, and the two top claws have the same stroke. Because the valve through hole is oval, in order to fix a standard, four points need to be fixed, and the jacking mechanism is preferably set to be four.

The existing self-centering chuck needs an independent power structure for each chuck, and the simultaneous movement of a plurality of chucks driven by one power structure cannot be realized. According to the valve self-centering tool clamp, the number of self-centering mechanisms can be multiple, the multiple self-centering mechanisms are connected to one transmission mechanism, and the transmission mechanism can drive the multiple self-centering mechanisms to move, so that energy is greatly saved, and the overall structure volume is reduced.

The length of the screw teeth on the top claw and the length of the screw thread on the end face thread disc in the screw thread matching mode determines the stroke amount of the top claw. The existing self-centering four-jaw chuck has no self-locking function, the structure of the joint of the top jaw and the piston of the oil cylinder can only be a conical surface (inclined surface), the length and the inclination angle of the inclined surface determine the stroke size, the designed stroke is small, and under the same size of the chuck and an end face threaded disc, the stroke amount of the top jaw of the valve self-centering tool fixture provided by the invention is far larger than that of the top jaw of the existing self-centering four-jaw chuck, for example, the large outer diameter of the existing self-centering four-jaw chuck is 200mm, the stroke amount of the top jaw is 3.7mm, the large outer diameter of the end face threaded disc of the valve self-centering tool fixture provided by the invention is 200mm, and the stroke amount of.

According to the valve self-centering tool clamp provided by the invention, the torsion limiter is arranged to reduce the torsion, the jacking mechanism cannot excessively jack the inner wall of the valve through hole, and reliable clamping torque is provided.

The existing self-centering four-jaw chuck has no self-locking function, if the pushing jaw is applied with force, the pushing jaw can generate displacement change, and the valve self-centering tool clamp provided by the invention is matched with the end face threaded disc, when a transmission shaft stops rotating, if the pushing mechanism is applied with force, the pushing mechanism cannot move, the self-locking function can be realized, and only when the end face threaded disc rotates, the pushing mechanism generates displacement change.

The valve self-centering tool fixture further comprises a fixing flange 8 fixedly connected with the mounting seat, the fixing flange 8 is used for being connected with a machine tool, and the mounting seat and the fixing flange are fixedly connected in an accurate matching mode.

The driving modes of the first driving mechanism and the second driving mechanism can be hydraulic pressure, pneumatic pressure or electric.

The invention also provides a method for positioning the valve through hole reference by using the valve self-centering tool clamp, which comprises the following steps:

s1, driving the mounting seat to enter the through hole of the valve to be processed to do linear motion by using the first driving mechanism until the mounting seat reaches a preset position, wherein all the jacking mechanisms are arranged in the through hole;

s2, driving a transmission shaft 3 of the mounting seat located at a preset position to rotate by a second driving mechanism so as to drive two torque limiters 4 to rotate in the same direction, driving two end-face threaded discs 5 to rotate in the same direction by the rotation of the torque limiters 4, further driving a plurality of tightening mechanisms to move towards the direction close to the inner wall of the valve through hole until the tightening mechanisms all abut against the inner wall, and enabling the axis line of the transmission shaft 3 to coincide with the valve through hole reference 11;

and S3, after the machining is finished, driving the transmission shaft 3 to rotate by using the second driving mechanism, so that the jacking mechanism returns, and then providing backward driving force to enable the mounting seat to integrally move backward until the mounting seat is withdrawn from the through hole of the valve, wherein the rotating direction of the transmission shaft 3 in the step S3 is opposite to the rotating direction of the transmission shaft 3 in the step S2.

In step S2, after the two tightening mechanisms oppositely disposed each first abut against the inner wall corresponding to the valve through hole, the torsion force on the torsion force limiter 4 corresponding to the two tightening mechanisms continues to rise until the torsion force is greater than the torsion force limit value, and the torsion force limiter 4 acts to protect and separate without affecting the continuous action of the other tightening mechanisms.

Because the valve through holes are not regular circles, the moving strokes of the top claws are different. When some top claws are firstly pushed to the inner wall of the through hole and then the transmission shaft still outputs power, the torque force on the torque limiter at the side of the top claw which is firstly pushed is continuously increased until the torque force exceeds the torque force limit value, and at the moment, the torque limiter acts and protects the separation (namely, when the transmission torque exceeds the set value of the torque limiter, the torque limiter automatically disengages), without influencing the continuous action of other top claws.

In step S3, when all the torque limiters (a set of self-centering mechanism includes two torque limiters, and if there are multiple sets of self-centering mechanisms, there are multiple torque limiters) are moved and protected and separated, the drive shaft stops moving, the valve is positioned and clamped completely, the a reference line of the valve automatically coincides with the central axis of the drive shaft (see two line diagrams in fig. 10 and 11, where a is the a reference line), which is the process is completed. The workpiece can be subjected to the next step (correction of the B reference surface and the C reference surface) or rough finishing of the two flanges can be used as an auxiliary fine reference.

The invention provides a valve self-centering tool clamp which can self-center, and realize larger clamping stroke, reliable clamping torque and self-locking capability; the valve self-centering tool clamp provided by the invention can be used in a single group or in two or more groups simultaneously (can be adjusted and manufactured according to products); the workpiece is simple and convenient to clamp and reliable in action; the production cost is low, and the production is easy; the valve self-centering tool clamp provided by the invention can be used for self-positioning valves with different inner diameters, and has universality; the operation method of the valve self-centering tool clamp provided by the invention is simple to operate, short in processing time and high in production efficiency.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A valve self-centering tool clamp is characterized by comprising a mounting seat, at least one self-centering mechanism, a first driving mechanism and a second driving mechanism, wherein the mounting seat comprises a main body part (2) and a transmission mechanism arranged in the main body part (2), the transmission mechanism comprises a transmission shaft (3), and the self-centering mechanism is connected with the transmission shaft (3);

each self-centering mechanism comprises two torque limiters (4) sleeved outside the transmission shaft (3), two oppositely-arranged end face threaded discs (5) arranged between the two torque limiters (4), and a plurality of tightening mechanisms arranged between the two end face threaded discs (5), each tightening mechanism moves relative to the center of each end face threaded disc (5), the end face threaded discs (5) correspond to the torque limiters (4) one by one and are fixedly connected with the torque limiters (4), and the transmission shaft (3), the torque limiters (4) and the end face threaded discs (5) are coaxially arranged;

under the drive of the first driving mechanism, the mounting seat enters the through hole of the valve (1) to be processed to do linear motion until reaching a preset position;

under second actuating mechanism's the drive, be located preset the position transmission shaft (3) of mount pad rotate in order to drive torque limiter (4) rotate, torque limiter (4) rotate and drive two terminal surface screw thread dish (5) syntropy rotates, and then drives a plurality ofly the tight mechanism in top removes until its equal conflict inner wall to the inner wall direction that is close to valve (1) through-hole, and makes the axial lead and the coincidence of valve through-hole benchmark (11) of transmission shaft (3).

2. The valve self-centering tooling fixture of claim 1, wherein the jacking mechanism comprises a jacking claw (6) in threaded connection with the end face threaded disk (5).

3. The valve self-centering tooling fixture of claim 2, wherein the jacking mechanism further comprises a plug (7) in threaded connection with the plug claw (6), the plug (7) being used for abutting against the inner wall of the through hole of the valve (1).

4. The valve self-centering tooling clamp according to claim 3, wherein the end face thread disc (5) is provided with end face threads, the top jaw (6) is externally provided with thread teeth matched with the end face threads, and the end face thread disc (5) is in threaded connection with the top jaw (6).

5. The valve self-centering tooling fixture of claim 1, wherein the number of the abutting mechanisms is four, the axial lines of two abutting mechanisms which are oppositely arranged coincide, the axial lines of the other two abutting mechanisms which are oppositely arranged coincide, and when the transmission shaft rotates, the two abutting mechanisms which are oppositely arranged move in opposite directions.

6. The valve self-centering tooling clamp according to claim 3, wherein the outer circumferential wall of one end of the plug (7) is provided with an external thread matched with the internal thread of the top jaw (6), and the other end is of a cylindrical structure.

7. Valve self-centering tooling clamp according to claim 2, wherein the top jaw (6) is of a cuboid structure.

8. Valve self-centering tool clamp according to claim 1, characterized in that the tightening mechanism is detachably arranged between two end-face threaded discs (5).

9. A method of locating a valve through-hole datum using the valve self-centering tooling fixture of any one of claims 1 to 8, comprising the steps of:

10. The method of positioning a valve through-hole datum in a valve self-centering tool fixture of claim 9,

in step S2, after the two oppositely disposed tightening mechanisms both abut against the inner walls corresponding to the valve through holes, the torsion forces on the torsion force limiters corresponding to the two tightening mechanisms continue to rise until the torsion force limiters are greater than the torsion force limit values, and the torsion force limiters are separated for protection.