CN111299414A - Deflection controllable and cracked tip passivation expansion radius compensation mechanism - Google Patents
Deflection controllable and cracked tip passivation expansion radius compensation mechanism Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
- B21D31/043—Making use of slitting discs or punch cutters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
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Abstract
The application provides a deflection controllable and cracked tip passivation radius expansion compensation mechanism, which relates to the technical field of precision forming, and comprises a rod unit and a ball head unit, wherein the rod unit is formed by connecting a first rod and a second rod; the ball head unit comprises a universal rotatable ball head, a ball head push rod and a spring; the compensating mechanism includes the bulge, the tip of bulge forms for hemisphere and circular barrel are integrative, and hemisphere and circular barrel junction are equipped with universal rotatable ball fulcrum, solve the tubular metal resonator material and often appear in the material dynamic separation overall process the problem that the loading capacity that exerts can not effectively regulate and control tubular product unloading end amount of deflection, and the microcosmic expression form is that the change of crack tip passivation radius is uncontrollable, before the crack expands to the tubular metal resonator inner wall, because of reacing the critical passivation radius of crack tip in advance and the problem of unstability snap.
Description
Technical Field
The invention relates to the technical field of precision forming, in particular to a deflection-controllable and crack tip passivation expansion radius compensation mechanism.
Background
The low stress blanking is to apply the crack technology to the blanking of the pipe (or the bar), firstly, an annular crack is artificially prefabricated on the surface of the pipe (or the bar), and then certain external force is applied to the pipe (or the bar) with the annular surface crack, so that the pipe (or the bar) is dynamically separated in a low stress brittle fracture mode. The low-stress bending fracture blanking is known as a precision blanking method with the most development potential in the future, the notch effect and the bending effect of the annular V-shaped groove are fully utilized, the brittle fracture of the material at a low stress level is realized, and a blank without geometric distortion, vertical and flat fracture and chamfering is obtained. Currently, researchers have conducted some researches on low-stress bending blanking technology from the aspects of stress concentration, mechanism design, fracture morphology and the like. However, key core technologies such as a material separation mechanism, an efficient precision implementation method, a quality evaluation standard and the like of low-stress bending blanking are not broken through, so that the comprehensive goals of improving the product precision and the production efficiency, reducing the energy consumption, reducing the pollution and the like cannot be really realized. In order to accelerate the development of the equipment manufacturing industry in China, the research of a novel technology for high-efficiency, high-quality, energy-saving and environment-friendly metal material near-net-shape forming blanking and a material separation mechanism is imperative.
According to the theory of linear elastic fracture mechanics, the ideal crack tip radius rho is 0, but the crack tip of the actual material can be passivated under the action of load (the crack tip of the ceramic material which is very brittle can also be deflected or turned along grain boundaries and producedA certain degree of passivation) and is no longer an ideal sharp crack, and the radius of the passivation of the crack tip before the crack propagates has a critical value pmin. As the load increases, the passivation radius also increases as the passivation radius just exceeds the critical value ρminWhen the stress at the material element at the tip of the crack reaches the fracture stress sigma of the materialffThe material element breaks and the crack steadily propagates forward a small distance Δ a. While the crack is steadily progressing forward, the radius of the tip passivation must be correspondingly increased, which is necessary to ensure that the crack can propagate steadily without developing a destabilization. When the radius of passivation reaches another critical value ρcIn the process, the passivation rate cannot counteract the change of load and the increase of the stress at the top end of the crack caused by crack propagation, the crack is unstably propagated, and the crack is broken. Critical passivation radius rho of crack tipcIs an important criterion for representing the instable instantaneous interruption of the material.
In the prior art, in the low-stress blanking process of the metal pipe material, a grooving link and a blanking link of the pipe material have no supporting structures, so that the situation of position deviation is easy to occur due to vibration; and the deflection of the blanking end of the pipe material can not be regulated and controlled in real time according to production needs, the bending deformation of the blanking end is large, and the change of the passivation radius of the crack tip of the V-shaped groove of the pipe material is microscopically uncontrollable. Particularly, in the later half of the blanking of the pipe, the force acted on the pipe by external loading is not the actual stress of the pipe, at the moment, the deflection of the blanking end of the pipe is very easy to rapidly increase under the combined action of the external loading force, the non-negligible inertia force, the gravity of the separated material and other forces, and the microscopic expression of the deflection is that the passivation radius of the tip of the crack rapidly reaches and exceeds the critical passivation radius rhocAnd the crack propagation is difficult to control to form an uneven instantaneous fracture area, so that the quality of the blanking section is influenced.
At present, as shown in fig. 1, a low-stress blanking machine for pipe materials is used, and a grooving and blanking part mainly comprises a loading transmission shaft 1a, a rotary table 2a, a blanking slide block 3a, a blanking hammer head 4a, a double-slide rail 5a, a cutter slide block 6a, a grooving cutter 7a and the like.
Because the existing pipe low-stress blanking machine is adopted for blanking, the slotting and blanking process of the pipe does not have a supporting structure, and the slotting process is easy to be caused by vibrationShifting the position; and the deflection of the blanking end can not be regulated and controlled at any time according to production needs, the bending deformation of the blanking end is large, and the change of the passivation radius of the tip of the crack is microscopically uncontrollable. Before the crack is expanded to the inner wall of the pipe material, the critical passivation radius rho of the crack tip is reached in advancecAnd unstable instantaneous interruption forms an uneven instantaneous interruption area, thereby affecting the quality of the section.
Disclosure of Invention
The invention aims to provide a deflection-controllable and crack tip passivation expansion radius compensation mechanism, which can be used for simultaneously supporting a pipe material and effectively controlling the deflection of a blanking end so as to realize controllable change of a crack tip passivation radius. Under the common coupling action of the loading force and the compensation feedback force, the passivation radius of the crack tip can be controllably changed between the passivation minimum radius and the critical passivation radius along with the blanking force in the whole crack propagation process, the problem that the deflection of the blanking end of a pipe cannot be effectively regulated and controlled by the applied loading force frequently occurring in the whole process of dynamic separation of metal pipes is solved, the change of the passivation radius of the crack tip is uncontrollable in a microscopic expression form, and the crack can be instable and instable to be broken instantly due to the fact that the crack tip reaches the critical passivation radius in advance before the crack propagates to the inner wall of the pipe.
In order to achieve the purpose, the invention provides the following technical scheme:
a deflection controllable and cracked tip passivation expansion radius compensation mechanism comprises
The rod unit is formed by connecting a first rod and a second rod;
the ball head unit comprises a universal rotatable ball head, a ball head push rod and a spring,
one elastic end part of the spring is arranged at the connecting part of the first rod body and the second rod body, the other elastic end part of the spring is connected with the ball head push rod, and the ball head push rod is connected with the universal rotatable ball head;
the end part of the convex part is hemispherical and is integrated with the round barrel, and the convex part is arranged on one side of the rod unit and is formed by connecting the first convex section and the second convex section;
the radial line of the rod unit is perpendicular to the axial line of the convex part.
Furthermore, the joint of the first rod body and the second rod body is matched with a die through a double dovetail groove, and the joint of the first protruding section and the second protruding section is matched with a die through a double dovetail groove.
Furthermore, a channel is arranged in the inner cavity of the protruding portion, a universal rotatable ball fulcrum is arranged at the joint of the first protruding section and the second protruding section, the channel is located in the middle of the inner cavity of the protruding portion, one end of the channel is communicated with the first accommodating cavity, and the other end of the channel is communicated with the second accommodating cavity arranged in the inner cavity of the rod unit.
Furthermore, the universal rotatable ball fulcrum part protrudes out of the surface of the circular cylinder body of the protruding part, the bottom of the universal rotatable ball fulcrum is positioned in the first accommodating cavity, a telescopic fulcrum is arranged on each of two sides of the telescopic fulcrum, and one end of each fulcrum spring is elastically connected to the end of the telescopic fulcrum while the other end of each fulcrum spring is elastically connected to the top surface of the first accommodating cavity.
Furthermore, the universal rotatable ball fulcrums and the telescopic fulcrums are four groups, the end parts of the four groups of telescopic fulcrums form a cross shape and are vertically arranged in the first accommodating cavity, and the number of the fulcrum springs is the same as that of the telescopic fulcrums.
Furthermore, four groups of cross-shaped intersections of the telescopic fulcrums are provided with round head push rods, the round head push rods penetrate through the channel and are connected with bottom end portions of connecting rods in the second accommodating cavities through second rivets, and top end portions of the connecting rods are connected with the ball head push rods through first rivets.
Compared with the prior art, the invention has the beneficial effects that:
1. through regard as the main part with the elastic rubber stick, its material self elasticity can provide compensation feedback power, and can satisfy the unloading in-process to the needs of flexible deformation, the during operation with scalable universal rotatory elastic rubber fulcrum direct contact pipe material inner wall, plays the supporting role to be used for balancing inertia force, gravity etc..
2. The deflection of the pipe material is effectively regulated and controlled under the common coupling action of the loading force and the compensation feedback force, and controllable change of the passivation radius of the crack tip is realized.
3. The compensation mechanism is designed to be connected with a die assembly structure of a double dovetail groove, is superior to a bolt connection mode, and is suitable for the limitation of a narrow internal supporting space.
4. The four telescopic elastic fulcrums are adopted, the four telescopic elastic fulcrums can extend out under the action of push rod thrust and spring force, and after the pipe materials are cut off, the four telescopic elastic fulcrums can automatically contract under the combined action of the spring force of the fulcrums and the elastic force of the spring at the ball head push rod.
5. The ball head push rod and the end part of the telescopic fulcrum all adopt universal rotatable balls, so that rotation in different directions can be realized, and friction between the telescopic fulcrum and the inner wall of a pipe material is reduced.
6. The bulb push rods with different sizes can be conveniently replaced, and compensation of pipe materials with different single-section lengths is achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic view of a slotted blanking portion of a prior art tube blanking machine;
FIG. 2 is a schematic structural diagram of a compensating mechanism according to an embodiment of the present invention;
FIG. 3 is a front view of a disclosed compensation mechanism according to an embodiment of the present invention;
FIG. 4 is a left side view of the disclosed compensation mechanism;
FIG. 5 is a top view of a disclosed compensation mechanism according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 4 in accordance with an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 3 in accordance with an embodiment of the present invention;
fig. 8 is a cross-sectional view taken along line C-C of fig. 3 in accordance with an embodiment of the present invention.
Reference numerals:
1 a-a loading drive shaft; 2 a-a turntable; 3 a-a blanking slide block; 4 a-a blanking hammer head; 5 a-double slide rail; 6 a-a tool slide; 7 a-grooving tool;
1-a spring; 2-a ball head push rod; 3-a universal rotatable ball head; 4-a first rod; 5-a second rod; 6-connecting rod; 7-a round head push rod; 8-a universally rotatable ball pivot; 9-telescopic fulcrum; 10-fulcrum spring; 11-a first rivet; 12-a second rivet; 13-a bolt; 14-double dovetail grooves; 15-a first protruding section; 16-a second protruding section; 17-a first accommodating cavity; 18-a second accommodating cavity; 19-a circular cylinder; 20-projection.
Detailed Description
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.
The deflection controllable and cracked tip passivation radius expansion compensation mechanism provided by the embodiment of the application comprises a rod body unit, a first rod body 4 and a second rod body 5, wherein the first rod body and the second rod body are connected; the ball head unit comprises a universal rotatable ball head 3, a ball head push rod 2 and a spring 1, wherein one elastic end part of the spring 1 is arranged at the connecting part of the first rod body 4 and the second rod body 5, the other elastic end part of the spring 1 is connected with the ball head push rod 2, and the ball head push rod 2 is connected with the universal rotatable ball head 3; the end part of the convex part is hemispherical and is integrated with the round barrel, and the convex part is arranged on one side of the rod unit and is formed by connecting the first convex section 15 with the second convex section 16; the radial line of the rod body unit is vertical to the axial line of the bulge, the problem that the deflection of the blanking end of the pipe cannot be effectively regulated and controlled by the applied load force in the whole process of dynamic separation of the metal pipe is solved, the microcosmic expression is that the change of the passivation radius of a crack tip is uncontrollable, and before the crack is expanded to the inner wall of the pipe, the crack is advancedReach the critical passivation radius rho of the crack tipcAnd the instability is broken instantaneously, the mechanism can be used for supporting the pipe material and effectively controlling the deflection of the blanking end at the same time, and further controllable change of the passivation radius of the cracking tip is realized. Under the common coupling action of the loading force and the compensation feedback force, the passivation radius of the crack tip controllably changes between the passivation minimum radius and the critical passivation radius along with the blanking force in the whole crack propagation process.
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
Fig. 1 is a schematic diagram of slotting blanking of a pipe blanking machine in the prior art, as shown in fig. 1. One end of the pipe material is fixed in the left end clamping mechanism, the other end of the pipe material is suspended under the slotting and blanking mechanism, the variable frequency motor drives the loading transmission shaft 1a to rotate, and at the moment, the rotary table 2a matched with the loading transmission shaft 1a also synchronously rotates along with the loading transmission shaft, so that the pipe material slotting and blanking integrated linkage device fixed on the rotary table 2a synchronously rotates. During slotting, the thrust loading cylinder pushes the loading sliding table to drive the rotary table 2a to move backwards, the cutter slide block 6a drives the slotting cutter 7a to approach the pipe material gradually along the double slide rails 5a, and at the moment, the blanking slide block 3a drives the blanking hammer head 4a to move away from the pipe material gradually, so that slotting operation on the pipe material is realized. During the unloading, the thrust loading jar promotes the loading slip table and drives 2a antedisplacement of carousel, and unloading slider 3 drives the pipe material of unloading tup 4a asymptotically, and cutter slider 6a drives slotting tool 7a along the pipe material of gradually keeping away from of double slide rail 5a this moment to at the most advanced crackle of pipe material V type groove, through control loading power, can be rapidly along its radial expansion after V type groove most advanced crackle sprouts, final complete fracture realizes the unloading.
However, the existing pipe low-stress blanking machine is adopted for blanking, no supporting structure is used in the slotting and blanking process of the pipe, and the slotting process is easy to generate position deviation due to vibration; and the deflection of the blanking end can not be regulated and controlled in real time according to production requirements, the bending deformation of the blanking end is large, and the change of the passivation radius of the tip of the crack is microscopically uncontrollable. Before the crack is expanded to the inner wall of the pipe material, the crack reaches the critical passivation radius rho c of the crack tip in advance to form an uneven transient fracture area, and the quality of the fracture surface is further influenced.
The utility model provides a controllable and splitting point passivation extension radius compensation mechanism of degree of disturbance installs the centre of a circle position at present pipe material low stress blanking machine loading transmission shaft 1a tip, specifically indicates the department in figure 1, through four bolts 13 with the barred body unit with loading slip table is connected fixedly.
As shown in fig. 2, 3 and 4, the compensation mechanism comprises a rod unit formed by connecting a first rod 4 and a second rod 5; the ball head unit comprises a universal rotatable ball head 3, a ball head push rod 2 and a spring 1, wherein one elastic end part of the spring 1 is arranged at the connecting part of the first rod body 4 and the second rod body 5, the other elastic end part of the spring 1 is connected with the ball head push rod 2, and the ball head push rod 2 is connected with the universal rotatable ball head 3; the end part of the convex part is hemispherical and is integrated with the round barrel, and the convex part is arranged on one side of the rod unit and is formed by connecting the first convex section 15 with the second convex section 16; the radial line of the rod unit is perpendicular to the axial line of the convex part.
Wherein, the first rod body 4, the second rod body 5, the first convex section 15 and the second convex section 16 are integrally formed.
Specifically, the first rod body 4 and the second rod body 5 are fixed at the center of a circle at the end of the loading transmission shaft 1a through four bolts 13, the first rod body 4 and the second rod body 5 are matched in a double-dovetail groove mode, at the moment, the ball head push rod 2 and the universal rotatable ball head 3 are in an extending state, the four universal rotatable ball fulcrums 8 and the telescopic fulcrum 9 are in a contracting state in the rod unit, one elastic end of the spring 1 is arranged at the connecting part of the first rod body 4 and the second rod body 5, the other elastic end of the spring 1 is connected with the ball head push rod 2, the ball head push rod 2 and the end of the telescopic fulcrum 9 both adopt the universal rotatable ball fulcrum 8, rotation in different directions can be achieved, and friction between the telescopic fulcrum 9 and the inner wall of a pipe material is reduced.
Referring to fig. 2, 5 and 8, the joint of the first bar 4 and the second bar 5 is a double dovetail groove matched die, and the joint of the first protruding section 15 and the second protruding section 16 is a double dovetail groove matched die.
Specifically, the compensation mechanism is designed to be connected with a clamping structure of a double dovetail groove, is superior to a bolt connection mode, and is suitable for the limitation of a narrow internal supporting space.
Referring to fig. 6 and 7, a channel is arranged in an inner cavity of a protruding portion formed by connecting a first protruding section 15 and a second protruding section 16, a universal rotatable ball pivot 8 is arranged at the joint of the first protruding section 15 and the second protruding section 16, the channel is located in the middle of the inner cavity of the protruding portion, one end of the channel is communicated with a first accommodating cavity 17, and the other end of the channel is communicated with a second accommodating cavity 18 arranged in an inner cavity of the rod unit. The universal rotatable ball fulcrum 8 partially protrudes out of the surface of the circular cylinder 19 of the protruding portion 20, the bottom of the universal rotatable ball fulcrum 8 is located in the first accommodating cavity 17, a telescopic fulcrum 9 is arranged in the first accommodating cavity 17, fulcrum springs 10 are arranged on two sides of the telescopic fulcrum 9 respectively, one end of each fulcrum spring 10 is elastically connected to the end portion of the telescopic fulcrum 9, and the other end of each fulcrum spring is elastically connected to the top surface of the first accommodating cavity 17.
Specifically, the pipe material of figure 1 is fed by left end fixture, feeds to the grooving position and fixes through anchor clamps, and pipe material unloading tip is just withstand universal bulb 1 and bulb push rod 2 this moment, and at this moment, bulb push rod 2 moves to the right, drives connecting rod 6 and removes, and connecting rod 6 moves to the left with button head push rod 7 link end portion, drives button head push rod 7 and moves to the left, promotes four scalable fulcrums 9 and compresses fulcrum spring 10 and make universal rotatable ball fulcrum 8 stretch out, makes four universal rotatable ball fulcrums 8 direct and the contact of pipe material inner wall.
Referring to fig. 7, the number of the universal rotatable ball fulcrums 8 and the telescopic fulcrums 9 is four, and the ends of the four telescopic fulcrums 9 are arranged in the first accommodating cavity 17 in a crossed manner, and the number of the fulcrum springs 10 is the same as that of the telescopic fulcrums 9.
Specifically, the number of universal rotatable ball fulcrums 8 and the number of telescopic fulcrums 9 are four groups, four telescopic fulcrums 9 which are telescopic and have elasticity are adopted, the four telescopic fulcrums can extend out under the action of the thrust of the round-head push rod 7 and the elasticity of the fulcrum spring 10, and after the materials are cut off, the four telescopic fulcrums can automatically contract under the combined action of the elasticity of the fulcrum spring 10 and the elasticity of the spring 1 at the position of the ball-head push rod 2.
Referring to fig. 6 and 8, a round head push rod 7 is arranged at the cross-shaped intersection of the four groups of telescopic supporting points 9, the round head push rod 7 passes through the channel and is connected with the bottom end part of a connecting rod 6 arranged in the second accommodating cavity 18 through a second rivet 12, and the top end part of the connecting rod 6 is connected with the ball head push rod 2 through a first rivet 11.
Particularly, as the pipe material is fed from the left end, the pipe material is fed to a grooving position and fixed by a clamp, the blanking end part of the pipe material just props against a universal ball head 1 and a ball head push rod 2 at the moment, the ball head push rod 2 moves to the right to drive a connecting rod 6 to move, the connecting end part of the connecting rod 6 and the ball head push rod 7 moves to the left to drive the ball head push rod 7 to move to the left, four telescopic supporting points 9 are pushed and a supporting point spring 10 is compressed to enable a universal rotatable ball point 8 to extend out, the four universal rotatable ball point 8 is directly contacted with the inner wall of the pipe material, the pipe material is supported in the grooving blanking process, required compensation feedback force is provided at the same time, the blanking end deflection and the tip passivation expansion radius are effectively regulated, the blanking end deflection of the pipe material is changed, and the blanking end part of the pipe.
In the initial state, under the combined action of the spring 1 and the four fulcrum springs 10, the ball head push rod 2 and the universal rotatable ball head 3 are in an extending state, and the four universal rotatable ball fulcrums 8 and the telescopic fulcrums 9 are in a contracting state in the rod body.
When the pipe slotting machine works, a pipe is fed from the left end, the pipe is fed to a slotting position and fixed by a clamp, the blanking end part of the pipe just props against a universal ball head 1 and a ball head push rod 2, at the moment, the ball head push rod 2 moves to the right to drive a connecting rod 6 to move, the connecting end part of the connecting rod 6 and a round head push rod 7 moves to the left to drive the round head push rod 7 to move to the left, four telescopic supporting points 9 are pushed and a supporting point spring 10 is compressed to enable the supporting points of the universal rotatable ball 8 to extend out, the four universal rotatable ball supporting points 8 are directly contacted with the inner wall of the pipe, the pipe slotting machine plays a role in supporting the pipe in the whole slotting and blanking process, simultaneously provides required compensation.
In the whole blanking process, the deflection of the blanking end of the pipe material is changed, and the blanking end of the pipe material is contacted with the universal rotatable ball head 3 to extrude the ball head push rod 2 at any time.
After the single-joint pipe material is broken, under the action of the gravity of the pipe material, the broken end is declined, the blanking end is upwards inclined, the blanking end of the pipe material is empty, the blanking end of the pipe material does not extrude the universal rotatable ball head 3 any more, at the moment, under the combined action of the reset spring force generated by the spring 1 and the four fulcrum springs 10, the four universal rotatable ball fulcrums 8 and the telescopic fulcrums 9 are contracted, the round head push rod 7 is rightwards moved to reset, the connecting rod 6 is reset, the ball head push rod 2 and the universal rotatable ball head 3 are leftwards moved to be in an extending state, and all components all reach the initial state again. The mechanism can be provided with and replace ball head push rods 2 of different series, so that compensation of pipe materials with different single lengths is realized.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: the controllable and sharp passivation extension radius compensation mechanism that splits of amount of deflection that this application embodiment provided, through regard as the main part with elastic rubber stick, its material self elasticity can provide compensation feedback power, and can satisfy the unloading in-process to the needs of flexible deformation, the during operation with the pipe material inner wall of universal rotatable ball fulcrum 8 direct contact, play the supporting role to be used for balancing inertia power, gravity etc.. The deflection of the pipe material is effectively regulated and controlled under the common coupling action of the loading force and the compensation feedback force, and controllable change of the passivation radius of the crack tip is realized. The compensation mechanism is designed to be connected with a die assembly structure of a double dovetail groove, is superior to a bolt connection mode, and is suitable for the limitation of a narrow internal supporting space. The four telescopic supporting points 9 are adopted, the round-head push rod 7 can extend out under the action of thrust and elastic force of the supporting point spring 10, and after the pipe material is cut off, automatic contraction can be realized under the combined action of the elastic force of the supporting point spring 10 and the elastic force of the spring 1 at the ball head push rod 2. The end parts of the ball head push rod 2 and the telescopic fulcrum 9 are all universal rotatable ball heads 3, so that rotation in different directions can be realized, and friction between the telescopic fulcrum 9 and the inner wall of a pipe material is reduced. The bulb push rods 2 with different sizes can be conveniently replaced, and compensation of pipe materials with different single-section lengths is achieved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a flexibility is controllable and cracked point passivation extension radius compensation mechanism which characterized in that: comprises that
The rod unit is formed by connecting a first rod and a second rod;
the ball head unit comprises a universal rotatable ball head, a ball head push rod and a spring,
one elastic end part of the spring is arranged at the connecting part of the first rod body and the second rod body, the other elastic end part of the spring is connected with the ball head push rod, and the ball head push rod is connected with the universal rotatable ball head;
the end part of the convex part is hemispherical and is integrated with the round barrel, and the convex part is arranged on one side of the rod unit and is formed by connecting the first convex section and the second convex section;
the radial line of the rod unit is perpendicular to the axial line of the convex part.
2. The deflection controllable and cracked tip passivated extension radius compensation mechanism of claim 1 further comprising: the joint of the first rod body and the second rod body is matched with a die through a double-dovetail groove, and the joint of the first protruding section and the second protruding section is matched with a die through a double-dovetail groove.
3. The deflection controllable and cracked tip passivated extension radius compensation mechanism of claim 1 further comprising: a channel is arranged in the inner cavity of the protruding portion, a universal rotatable ball supporting point is arranged at the joint of the first protruding section and the second protruding section, the channel is located in the middle of the inner cavity of the protruding portion, one end of the channel is communicated with the first accommodating cavity, and the other end of the channel is communicated with the second accommodating cavity arranged in the inner cavity of the rod unit.
4. The mechanism of claim 3, wherein the deflection controllable and cracked tip passivated extension radius compensation mechanism comprises: the universal rotatable ball fulcrum part protrudes out of the surface of the circular cylinder body of the protruding part, the bottom of the universal rotatable ball fulcrum is located a telescopic fulcrum is arranged in the first containing cavity, fulcrum springs are arranged on two sides of the telescopic fulcrum respectively, one end of each fulcrum spring is elastically connected to the end part of the telescopic fulcrum, and the other end of each fulcrum spring is elastically connected to the top surface of the first containing cavity.
5. The mechanism of claim 4, wherein the deflection controllable and cracked tip passivated extension radius compensation mechanism comprises: the universal rotatable ball fulcrums and the telescopic fulcrums are four groups, the end parts of the four groups of telescopic fulcrums form a cross shape and are vertically arranged in the first accommodating cavity, and the number of the fulcrum springs is the same as that of the telescopic fulcrums.
6. A deflection controllable and crack tip passivation propagation radius compensation mechanism as claimed in any one of claims 4 and 5, wherein: the four groups of crossed parts of the telescopic supporting points are provided with round head push rods, the round head push rods penetrate through the channel and are connected with the bottom end parts of the connecting rods in the second accommodating cavities through second rivets, and the top end parts of the connecting rods are connected with the ball head push rods through first rivets.
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| CN202010114562.4A CN111299414B (en) | 2020-02-25 | 2020-02-25 | Deflection controllable and cracked tip passivation expansion radius compensation mechanism |
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| CN202010114562.4A CN111299414B (en) | 2020-02-25 | 2020-02-25 | Deflection controllable and cracked tip passivation expansion radius compensation mechanism |
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