An internal rounding device for a restrained coupling blank

Abstract

The utility model discloses a restraint type internal rounding device of coupling blank belongs to the technical field of coupling production rounding equipment. The restraint type internal rounding device of coupling blank provided includes a first support, two second supports, four third supports, four fourth supports, four fifth supports, two modules, two linear bearings, eight connecting rods, forty bolts and sixteen rolling bearings, and the device can realize the internal rounding of the coupling blank with the non-roundness, and has the characteristics of low manufacturing cost, simple operation and good use effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of coupling production and rounding equipment, specifically relating to an internal rounding device for a constraint-type coupling blank. Background Technology

[0002] Currently, large seamless steel pipe manufacturers are producing oil casing, which consists of a pipe body and couplings connected by threads. Due to the combined effects of rolling pressure, structural stress, and its own weight, the steel pipe may develop a certain degree of out-of-roundness. This can result in black threads on the pipe body during external threading or on the coupling blank during internal threading, both of which reduce the connection strength and sealing performance of the oil casing. Some manufacturers use turning to round the ends of the steel pipe both internally and externally. The advantage of this method is that it can round the ends of the steel pipe simultaneously with relatively high precision. The disadvantage is that it requires an increase in the wall thickness of the steel pipe, increasing metal consumption to achieve the rounding effect. Other manufacturers use external rounding to round the ends of the steel pipe. The advantage of this method is that it does not increase metal consumption and has relatively high precision. The disadvantage is that it can only guarantee the external rounding precision of the pipe body and is only suitable for external threading of the pipe body. If the coupling blank has uneven wall thickness, it is difficult to guarantee the precision of the internal threading of the coupling blank. Since the coupling blank is cut into short sections of pipe of a fixed length, this creates certain conditions for the internal rounding of the coupling blank. Therefore, it is necessary to develop a device that can perform internal rounding of the coupling blank.

[0003] After searching, three patent documents were found to be most relevant to this utility model technology. The specific contents are described below:

[0004] Patent document CN 201010575473.6 discloses a pipe outer diameter trimming device. The device includes a tool holder, a tool setting bar, a small base plate, a large base plate, a small support plate, a base, a power mechanism, a clamp, a mandrel, and a protective cover. The device has a novel design and ingenious concept. It uses a piston-type mandrel to realize the static processing of the pipe and uses a multi-tool combination to realize the automatic processing of the inner and outer diameters and end faces of the pipe end. It has the characteristics of high production efficiency, good dimensional accuracy, wide processing range, and low tool wear, providing a reliable technical guarantee for pipe-to-pipe butt welding. Since the device is based on turning to trim the outer diameter of the pipe, the device needs to increase the wall thickness of the pipe, which increases the metal consumption.

[0005] Patent document CN 202123369453.6 discloses a steel pipe rounding device, which includes a base plate, a worm gear, a worm, a mounting frame, a handwheel, a connecting plate, a skeleton plate, a roller pressing die, a movable plate, an adjusting mechanism, and a slider. The device has a novel design and ingenious concept. The two roller pressing dies together form a rounding channel, and the center line of the rounding channel coincides with the rotation axis of the mounting frame. The mounting frame can be rotatably connected to the base plate. When the protrusion of the steel pipe is exactly outside the contact range of the two roller pressing dies, by rotating the mounting frame, the two roller pressing dies can contact the protrusion of the steel pipe to achieve rounding of the steel pipe. This device rounds the steel pipe based on the external rounding method, which is equivalent to a steel pipe sizing machine.

[0006] Patent document CN 202420950753.8 discloses a steel ring rounding mechanism. This device includes a worktable, hydraulic cylinder, lifting platform, slider, bidirectional lead screw, motor, worm gear, worm wheel, rotating roller, threaded rod, and limiting plate. The device features a novel and ingenious design. The motor drives the bidirectional lead screw to rotate, which in turn drives the worm gear. The worm wheel meshes with the slider, which in turn moves synchronously, thus achieving synchronous movement of the rotating roller, thereby clamping the steel ring. The rotating threaded rod drives the limiting plate to move synchronously downwards, limiting the top of the steel ring. The rotating roller drives the steel ring to rotate, thus rounding the steel ring. This device features good repair effect and strong practicality, and it is also based on an external rounding method. Utility Model Content

[0007] To overcome one or more problems existing in the prior art, this utility model provides an internal rounding device for a constraint-type coupling blank. The combined use of the first bracket and bolts enables the relative arrangement of two second brackets, and the use of the second brackets enables the relative arrangement of eight connecting rods in pairs. The use of the connecting rods enables the linear bearing to move left and right along the horizontal direction, and the combined use of the linear bearing and bolts enables the relative arrangement of four fifth brackets in pairs. The combined use of the module and bolts enables the relative arrangement of four third brackets in pairs. The combined use of the third bracket, fifth brackets and rolling bearings enables the positioning and swinging of the fourth bracket, thereby enabling the two modules to move back and forth along the horizontal direction. The combined use of the two modules enables the rounding of the inner surface of the coupling blank from the front and back directions. Therefore, the device of this utility model has a relatively good effect.

[0008] The technical solution adopted by this utility model to solve its technical problem is as follows.

[0009] The inner rounding device for the constraint-type coupling blank provided by this utility model includes a first bracket, two second brackets, four third brackets, four fourth brackets, four fifth brackets, two modules, two linear bearings, eight connecting rods, forty bolts, and sixteen rolling bearings.

[0010] The first bracket is composed of a first body and eight first protrusions connected together. The first body and the first protrusions are both rectangular symmetrical structures. The eight first protrusions are divided into two groups. The four first protrusions in each group are arranged opposite each other and are located on the upper end face of the first body at the same time. A first screw hole is opened in the middle part of the upper end face of the first protrusion, and the bolt is screwed into the first screw hole.

[0011] The second bracket is composed of a second body, a second boss, and eight third bosses connected together. The second body and the second boss are both symmetrical cuboid structures. The second boss is located on the upper end face of the second body. The eight third bosses are divided into two groups, with the four third bosses in each group arranged opposite each other and simultaneously located on the right end face of the second boss. The upper end face of the second body has four cylindrical first through holes symmetrically opened, and the bolts are inserted into the first through holes. The third boss is a cylindrical symmetrical structure, and a cylindrical first groove is opened at the axial part of the right end face of the third boss, and the end of the connecting rod is inserted into the first groove.

[0012] The third bracket is composed of a third body and two fourth protrusions connected together. Both the third body and the fourth protrusions are symmetrical rectangular parallelepiped structures. The two fourth protrusions are arranged opposite each other and are located on the rear end face of the third body. The rear end face of the third body has four cylindrical second through holes symmetrically opened, and the bolts are inserted into the second through holes. A cylindrical second groove is opened in the middle part of the lower end face of the fourth protrusion, and the rolling bearing is inserted into the second groove. A cylindrical third through hole is opened in the axial part of the second groove, and the bearing section of the fourth bracket is inserted into the third through hole.

[0013] The fourth support is composed of two fourth bodies, two fifth protrusions, and four bearing segments connected together. The fourth bodies and the fifth protrusions are both symmetrical cuboid structures. The two fourth bodies are arranged opposite each other, and the two fifth protrusions are arranged opposite each other and located between the two fourth bodies. The four bearing segments are arranged opposite each other in pairs and are located on the upper and lower four end faces of the two fourth bodies respectively. The bearing segments are symmetrical cylindrical structures used to carry the rolling bearings.

[0014] The fifth bracket is composed of a fifth body and two sixth protrusions connected together. Both the fifth body and the sixth protrusions are symmetrical rectangular parallelepiped structures. The two sixth protrusions are arranged opposite each other and are located on the right end face of the fifth body. The right end face of the fifth body has four cylindrical fourth through holes symmetrically opened, and the bolts are inserted into the fourth through holes. A cylindrical third groove is opened in the middle part of the upper surface of the sixth protrusion, and the rolling bearing is inserted into the third groove. A cylindrical fifth through hole is opened in the axial part of the third groove, and the bearing section of the fourth bracket is inserted into the fifth through hole.

[0015] The horizontal cross-section of the module is a symmetrical structure in the shape of an arc, with a central angle of 90 degrees. The front end face of the module is a curved surface, the curvature of which should be equal to the curvature of the standard inner circle of the coupling blank, for internal rounding of the coupling blank. The rear end face of the module is a plane, with two sets of eight second screw holes symmetrically provided on the plane, and the bolts are screwed into the second screw holes.

[0016] In some embodiments, the linear bearing consists of a sixth body and eight seventh bosses connected together. The sixth body has a symmetrical rectangular parallelepiped structure. The eight seventh bosses are divided into two groups, with four seventh bosses in each group arranged opposite each other and simultaneously located on the right end face of the sixth body. The right end face of the sixth body has two sets of eight third screw holes symmetrically opened, and the bolts are screwed into the third screw holes. The seventh boss has a symmetrical cylindrical structure. A cylindrical sixth through hole is opened at the axial part of the seventh boss. The middle part of the connecting rod passes through the sixth through hole, which also passes through the sixth body. The seventh boss also has a cage, balls, and retaining rings.

[0017] In some embodiments, the connecting rod is a cylindrical symmetrical structure, with the middle part of the connecting rod passing through the sixth through hole of the linear bearing, and the two ends of the connecting rod passing through the first groove of the second bracket.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1) The inner rounding device for the constraint-type coupling blank provided by this utility model includes a first bracket, two second brackets, four third brackets, four fourth brackets, four fifth brackets, two modules, two linear bearings, eight connecting rods, forty bolts and sixteen rolling bearings. Since the materials are common and easy to process and form, the manufacturing cost of this utility model device is relatively low.

[0020] 2) When using this utility model device, initially, all four fourth supports are in a relaxed configuration. The heated coupling blank is passed through two second supports and erected on the first body of the first support, with a relatively short inner diameter set along the front-back direction. With Q as the swing axis, four servo motors are simultaneously driven in the forward direction. ①, ②, ③, and ④ can simultaneously swing in the forward direction at a uniform speed of 90 degrees, and the two curved surfaces of the two modules can perform internal rounding of the coupling blank from the front-back direction. With Q as the swing axis, four servo motors are simultaneously driven in the reverse direction. ①, ②, ③, and ④ can simultaneously swing in the reverse direction at a uniform speed of 90 degrees, rotating the coupling blank 90 degrees along the horizontal direction. With Q as the swing axis, four servo motors are simultaneously driven in the forward direction. ①, ②, ③, and ④ can simultaneously swing in the forward direction at a uniform speed of 90 degrees, and the two curved surfaces of the two modules can perform internal rounding of the coupling blank from the front-back direction. Therefore, the operation of this utility model device is relatively simple.

[0021] 3) This utility model device adopts a symmetrical structure design. The combined use of the first bracket and bolts enables the relative setting of two second brackets. The use of the second brackets enables the relative setting of eight connecting rods in pairs. The use of the connecting rods enables the linear bearing to move left and right along the horizontal direction. The combined use of the linear bearing and bolts enables the relative setting of four fifth brackets in pairs. The combined use of the module and bolts enables the relative setting of four third brackets in pairs. The combined use of the third bracket, fifth brackets and rolling bearings enables the positioning and swinging of the fourth bracket, thereby enabling the two modules to move back and forth along the horizontal direction. The combined use of the two modules enables the purpose of rounding the inner surface of the hoop blank from the front and rear directions. Therefore, the effect of this utility model device is relatively good.

[0022] The internal rounding device for the constraint-type coupling blank provided by this utility model can achieve the purpose of internal rounding of coupling blanks with out-of-roundness. This utility model device has the characteristics of low manufacturing cost, simple operation and good use effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the inner rounding device for the constraint-type coupling blank of this utility model.

[0024] Figure 2 This is a left-side structural schematic diagram of the inner rounding device for the constraint-type coupling blank of this utility model when the fourth bracket is arranged in a front-to-back configuration.

[0025] Figure 3 This is a top view of the internal rounding device for the constraint-type coupling blank of this utility model before rounding the coupling blank.

[0026] Figure 4This is a top view of the inner rounding device for the constraint-type coupling blank of this utility model after rounding the coupling blank.

[0027] Figure 5 This is a schematic diagram of the front view of the first support structure of this utility model;

[0028] Figure 6 This is a top view of the first support structure of this utility model;

[0029] Figure 7 This is a schematic diagram of the main structure of the module of this utility model;

[0030] Figure 8 This is a top view of the module of this utility model;

[0031] Figure 9 This is a right-side view of the structure of the second support of this utility model;

[0032] Figure 10 This is a top view of the second support structure of this utility model;

[0033] Figure 11 This is a schematic diagram of the front view of the third support structure of this utility model;

[0034] Figure 12 This is a bottom view of the structure of the third bracket and a rolling bearing assembled according to this utility model.

[0035] Figure 13 This is a schematic diagram of the main structure of the fourth bracket of this utility model;

[0036] Figure 14 This is a top view of the fourth support structure of this utility model;

[0037] Figure 15 This is a schematic diagram of the right side of the fifth support structure of this utility model;

[0038] Figure 16 This is a top view of the fifth bracket and a rolling bearing assembled according to this utility model.

[0039] Figure 17 This is a schematic diagram of the main structure of the linear bearing of this utility model;

[0040] Figure 18 This is a right-side structural schematic diagram of the linear bearing of this utility model;

[0041] Figure 19 This is a top view of the connecting rod of this utility model.

[0042] Figure 20This is a top view of the forward swing structure of the fourth support of this utility model when it is changed from a left-right arrangement to a front-back arrangement;

[0043] Figure 21 This is a top view of the reverse swing structure of the fourth support of this utility model when it is changed from a front-to-back arrangement to a left-to-right arrangement;

[0044] Figure 22 This is a schematic diagram illustrating the working principle of the inner rounding device for the constraint-type coupling blank of this utility model.

[0045] Explanation of reference numerals in the attached drawings: 1-First bracket; 101-First body; 102-First boss; 103-First screw hole; 2-Module; 201-Second screw hole; 3-Second bracket; 301-Second body; 302-Second boss; 303-Third boss; 304-First through hole; 305-First groove; 4-Third bracket; 401-Third body; 402-Fourth boss; 403-Second through hole; 404-Second groove; 405-Third through hole 5-Hole; 5-Fourth bracket; 501-Fourth body; 502-Fifth boss; 503-Bearing section; 6-Fifth bracket; 601-Fifth body; 602-Sixth boss; 603-Fourth through hole; 604-Third groove; 605-Fifth through hole; 7-Linear bearing; 701-Sixth body; 702-Seventh boss; 703-Third screw hole; 704-Sixth through hole; 8-Connecting rod; 9-Bolt; 10-Rolling bearing; 11-Coupling blank. Detailed Implementation

[0046] The present invention will be described in detail below with reference to the embodiments and accompanying drawings. The embodiments are only for understanding the present invention and are not intended to limit the content of the present invention.

[0047] Combination Figures 1 to 4As shown, this utility model provides an internal rounding device for a constraint-type coupling blank, which includes a first support 1, two second supports 3, four third supports 4, four fourth supports 5, four fifth supports 6, two modules 2, two linear bearings 7, eight connecting rods 8, forty bolts 9, and sixteen rolling bearings 10; wherein, the eight upper end faces of the eight first bosses 102 of the first support 1 are respectively provided with two second bodies 301 of the two opposing second supports 3, and are connected by the eight bolts 9; the sixteen ends of the eight opposing connecting rods 8 are respectively inserted into the sixteen first grooves 305 of the two second supports 3, and the eight middle parts of the eight connecting rods 8 are respectively inserted into the sixteen sixth through holes 704 of the two opposing linear bearings 7; the two linear bearings 10... Between the two sixth bodies 701 of the support 7, four fifth bodies 601 of the fourth bracket 6 are respectively arranged in pairs and connected by sixteen bolts 9; eight rolling bearings 10 are respectively inserted into the eight third grooves 604 of the four fifth brackets 6, and eight bearing segments 503 of the four fourth brackets 5 are respectively inserted into the eight rolling bearings 10; the other eight bearing segments 503 of the four fourth brackets 5 are respectively inserted into the eight rolling bearings 10, and the eight rolling bearings 10 are respectively inserted into the eight second grooves 404 of the four third brackets 4; two opposing modules 2 are respectively arranged outside the four end faces of the four third bodies 401 of the four third brackets 4, and connected by sixteen bolts 9.

[0048] The present invention provides an assembly method for an internal rounding device for a constraint-type coupling blank.

[0049] Combination Figures 1 to 19 As shown, firstly, eight rolling bearings 10 are installed in the eight second grooves 404 of the four third brackets 4. Then, two third brackets 4 are placed in front of each other, and then two other third brackets 4 are placed in the back. Then, the eight bearing segments 503 of the four fourth brackets 5 are respectively inserted into the eight rolling bearings 10. In this way, the four third brackets 4, the eight rolling bearings 10 and the four fourth brackets 5 can be assembled.

[0050] Then, two opposing modules 2 are respectively set outside the four front and rear end faces of the four third bodies 401 of the four third brackets 4, and the sixteen second through holes 403 of the four third brackets 4 and the sixteen second screw holes 201 of the two modules 2 are aligned. Then, sixteen bolts 9 are passed through the sixteen second through holes 403 and screwed into the sixteen second screw holes 201. In this way, the four third brackets 4 and the two modules 2 can be assembled.

[0051] Then, eight rolling bearings 10 are installed in the eight third grooves 604 of the four fifth brackets 6. Then, two fifth brackets 6 are placed to the left relative to each other, and two other fifth brackets 6 are placed to the right relative to each other. Then, the other eight bearing segments 503 of the four fourth brackets 5 are respectively inserted into the eight rolling bearings 10. In this way, the four fifth brackets 6, the eight rolling bearings 10 and the four fourth brackets 5 can be assembled.

[0052] Then, two sixth bodies 701 of two linear bearings 7 are respectively set outside the four end faces of the four fifth bodies 601 of the four fifth brackets 6, and the sixteen third screw holes 703 of the two linear bearings 7 and the sixteen fourth through holes 603 of the four fifth brackets 6 are aligned. Then, sixteen bolts 9 are passed through the sixteen fourth through holes 603 and screwed into the sixteen third screw holes 703. In this way, the two linear bearings 7 and the four fifth brackets 6 can be assembled.

[0053] Then, the eight middle parts of the eight connecting rods 8 are respectively inserted into the sixteen sixth through holes 704 of the two linear bearings 7. Then, the two second brackets 3 are arranged opposite each other. Then, the sixteen ends of the eight connecting rods 8 are respectively inserted into the sixteen first grooves 305 of the two second brackets 3. In this way, the two linear bearings 7, the eight connecting rods 8 and the two second brackets 3 can be assembled.

[0054] Then, the first bracket 1 is horizontally set, and the two second bodies 301 of the two second brackets 3 are simultaneously set on the eight upper surfaces of the eight first protrusions 102 of the first bracket 1. The eight first through holes 304 of the two second brackets 3 are aligned with the eight first screw holes 103 of the first bracket 1. Finally, the eight bolts 9 are passed through the eight first through holes 304 and screwed into the eight first screw holes 103. In this way, the entire device is assembled and can be put into use.

[0055] The principle for setting the swing direction of the fourth support in the inner rounding device of the constraint coupling blank provided by this utility model.

[0056] Combination Figure 3 and Figure 4As shown in the top view of the present invention, for ease of description, the four fourth supports 5 arranged in pairs opposite each other are numbered respectively. The fourth support 5 located at the front left is defined as ①, the fourth support 5 located at the front right is defined as ②, the fourth support 5 located at the rear right is defined as ③, and the fourth support 5 located at the rear left is defined as ④.

[0057] Since the four third supports 4 can only change position in the front-back direction and the four fifth supports 6 can only change position in the left-right direction, it is advisable to regard the eight bearing segments 503 located within the eight third through holes 405 of the four third supports 4 as driving shafts and to designate them as Q. Correspondingly, the other eight bearing segments 503 located within the eight fifth through holes 605 of the four fifth supports 6 are regarded as driven shafts.

[0058] Combination Figure 3 As shown, assuming that initially all four fourth supports 5 are in a relaxed arrangement, that is, all eight fifth protrusions 502 are arranged horizontally, the simplified arrangement is as follows: Figure 20 As shown, along the four swing axes Q, ① and ③ simultaneously swing 90 degrees counterclockwise, and ② and ④ simultaneously swing 90 degrees clockwise. Then, all four fourth supports 5 are in working position, that is, all eight fifth protrusions 502 are arranged in a front-to-back manner. It is reasonable to define the swing directions of ①, ②, ③ and ④ as positive.

[0059] Combination Figure 4 As shown, assuming that initially all four fourth supports 5 are in a working configuration, that is, all eight fifth protrusions 502 are arranged in a front-to-back configuration, the simplified configuration is as follows: Figure 21 As shown, along the four swing axes Q, ① and ③ simultaneously swing 90 degrees clockwise, and ② and ④ simultaneously swing 90 degrees counterclockwise. Then, the four fourth supports 5 are all in a relaxed arrangement, that is, the eight fifth protrusions 502 are all in a left-right arrangement. We can define the swing directions of ①, ②, ③ and ④ as reverse.

[0060] The working principle of the internal rounding device for the constraint-type coupling blank provided by this utility model

[0061] Based on the fundamental knowledge of metallurgy, most oil casing uses high-quality carbon manganese steel as the raw material and adopts a production process of billet heating → fungal piercing → continuous rolling → tension reduction. Since the deformation resistance of high-quality carbon manganese steel in the austenitic region is about one-tenth of that at room temperature, and rounding in the austenitic region can also eliminate residual stress in the steel pipe to a certain extent, which is beneficial to improving the stability of the geometric dimensions and mechanical properties of the steel pipe, an induction coil is used to heat the coupling blank 11 to 900°C in order to achieve austenitization of the microstructure.

[0062] Since this utility model is based on the principle of equal volume deformation of steel materials, and the inner rounding process cannot change the wall thickness of the coupling blank 11, the inner rounding process cannot change the circumferential length of the coupling blank 11. The coupling blank 11 that needs to be rounded at the beginning has a certain degree of non-roundness. It is advisable to regard the coupling blank 11 at the beginning as an approximate ellipse. However, the difference between the minor axis and the major axis of the ellipse is not particularly obvious. It is advisable to define them as the relatively short inner diameter and the relatively long inner diameter of the coupling blank 11.

[0063] Combination Figure 22 As shown, in order to improve the rounding effect and simplify the operation, the curvature of the curved surface of the module 2 should be equal to the curvature of the standard inner circle of the coupling blank 11, and the distance between the far points of the two curved surfaces of the two modules 2 that are arranged opposite each other should be equal to the standard inner diameter of the coupling blank 11. In this way, when all four fourth supports 5 are in working position, that is, when all eight fifth protrusions 502 are arranged in front and behind, the part in contact between the coupling blank 11 and the two curved surfaces of the two modules 2 is rounded internally.

[0064] Combination Figure 22 As shown, the inner radius of the coupling blank 11 can be defined as r, and the axis of the coupling blank 11 can be defined as O. When the eight fifth protrusions 502 are arranged in a front-to-back manner, the left and right edges of the module 2 in front are defined as A and B, and the left and right edges of the module 2 in the back are defined as D and C, respectively. In order to improve the rounding effect, when rounding the inner circle for the first time, the relatively shorter inner diameter of the coupling blank 11 should be set along the front-to-back direction, and the relatively longer inner diameter should be set along the left-to-right direction.

[0065] The horizontal cross-section of module 2 is arc-shaped, and the central angle of the arc is 90 degrees, that is, module 2 is a quarter-circle arc. Since ∠AOB=90 degrees=∠COD, points A, O and C are collinear, and points B, O and D are collinear. That is, AC and BD are the two inner diameters of the coupling blank 11. One internal rounding can complete the internal rounding of the two right-angle sector areas of the coupling blank 11. Rotate the coupling blank 11 90 degrees along the horizontal direction and perform internal rounding again to complete the overall internal rounding of the coupling blank 11.

[0066] In order to achieve precise swinging of the four fourth supports 5, four couplings, four reducers and four servo motors can be installed on the four bearing sections 503 at the bottom of the four drive shafts. Since the encoder can detect the position, speed and acceleration of the rotor in time and feed this information back to the servo driver in time, the precise control of the servo motor can be achieved. The reducer can convert the relatively high speed of the servo motor into a relatively low speed. Therefore, by driving four servo motors, the precise swinging of the four fourth supports 5 can be achieved.

[0067] For ease of description, let's define the direction of rotation of the four servo motors when ①, ②, ③, and ④ can simultaneously perform forward swing as forward, and the direction of rotation of the four servo motors when ①, ②, ③, and ④ can simultaneously perform reverse swing as reverse.

[0068] The method of using the internal rounding device for the constraint-type coupling blank provided by this utility model

[0069] Step 1: Assuming that initially all four fourth supports 5 are in a relaxed configuration, that is, all eight fifth protrusions 502 are in a left-right configuration, firstly, the heated coupling blank 11 is passed through two second supports 3 and erected on the first body 101 of the first support 1, ensuring that the relatively short inner diameter is set along the front-back direction; then, with Q as the swing axis, four servo motors are driven in the forward direction at the same time, so that ①, ②, ③ and ④ can swing in the forward direction at a uniform speed of 90 degrees and are all in a working configuration. During this period, the two curved surfaces of the two modules 2 can perform internal rounding on the coupling blank 11 from the front-back direction;

[0070] Step 2: Then, using Q as the oscillation axis, four servo motors are simultaneously driven in the opposite direction so that ①, ②, ③, and ④ can simultaneously oscillate in the opposite direction at a uniform speed of 90 degrees and are all in a relaxed setting. Then, the coupling blank 11 is rotated 90 degrees in the horizontal direction. Then, using Q as the oscillation axis, four servo motors are simultaneously driven in the forward direction so that ①, ②, ③, and ④ can simultaneously oscillate in the forward direction at a uniform speed of 90 degrees and are all in a working setting. During this period, the two curved surfaces of the two modules 2 can perform internal rounding on the coupling blank 11 from the front and rear directions. In this way, the overall internal rounding of the coupling blank 11 can be completed.

[0071] Supplementary Explanation: The inner rounding device for the constraint-type coupling blank provided by this utility model adopts a symmetrical structure design. The device should be designed and manufactured to match the inner diameter, wall thickness, and fixed length of the coupling blank. It should be ensured that the coupling blank is not obliquely cut; that is, when the coupling blank is vertically mounted on the first body of the first support, the axis of the coupling blank should be perpendicular to the first body. This ensures that during the forward swinging of the four fourth supports, the two curved surfaces of the two modules can always perfectly fit with the inner surface of the coupling blank, thus achieving effective rounding. To ensure the rounding effect and fully utilize the potential of the device, the module's height should be equal to the fixed length of the coupling blank. To simplify the operation and improve the device's efficiency, when the eight fifth protrusions of the four fourth supports are arranged front and back, the two curved surfaces of the two modules are exactly located on the standard inner surface of the coupling blank.

[0072] As can be seen from the embodiments, the internal rounding device for the constraint-type coupling blank provided by this utility model can achieve the purpose of internal rounding of coupling blanks with out-of-roundness. The device of this utility model has the characteristics of low manufacturing cost, simple operation and good use effect.

[0073] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features.

Claims

1. A device for internal rounding of a constraint-type coupling blank, characterized in that, The inner rounding device for the constrained coupling blank includes: one first bracket (1), two second brackets (3), four third brackets (4), four fourth brackets (5), four fifth brackets (6), two modules (2), two linear bearings (7), eight connecting rods (8), forty bolts (9), and sixteen rolling bearings (10), wherein: The first bracket (1) is composed of a first body (101) and eight first protrusions (102). The first body (101) and the first protrusions (102) are both rectangular parallelepiped symmetrical structures. The eight first protrusions (102) are divided into two groups. The four first protrusions (102) in each group are arranged opposite each other and are located on the upper end face of the first body (101). A first screw hole (103) is opened in the middle part of the upper end face of the first protrusion (102), and the bolt (9) is screwed into the first screw hole (103). The second bracket (3) is composed of a second body (301), a second boss (302) and eight third bosses (303). The second body (301) and the second boss (302) are both rectangular parallelepiped symmetrical structures. The second boss (302) is located on the upper end face of the second body (301). The eight third bosses (303) are divided into two groups. The four third bosses (303) in each group are arranged opposite each other and are located on the right end face of the second boss (302). The upper end face of the second body (301) is symmetrically provided with four cylindrical first through holes (304). The bolts (9) are inserted into the first through holes (304). The third boss (303) is a cylindrical symmetrical structure. A cylindrical first groove (305) is provided on the axial part of the right end face of the third boss (303). The end of the connecting rod (8) is inserted into the first groove (305). The third bracket (4) is composed of a third body (401) and two fourth protrusions (402). The third body (401) and the fourth protrusions (402) are both rectangular parallelepiped symmetrical structures. The two fourth protrusions (402) are arranged opposite to each other and are located on the rear end face of the third body (401). The rear end face of the third body (401) is symmetrically provided with four cylindrical second through holes (403), and the bolts (9) are inserted into the second through holes (403). A cylindrical second groove (404) is provided in the middle part of the lower end face of the fourth protrusion (402), and the rolling bearing (10) is inserted into the second groove (404). A cylindrical third through hole (405) is provided in the axial part of the second groove (404), and the bearing section (503) of the fourth bracket (5) is inserted into the third through hole (405). The fourth bracket (5) is composed of two fourth bodies (501), two fifth protrusions (502), and four bearing segments (503). The fourth bodies (501) and the fifth protrusions (502) are both rectangular parallelepiped symmetrical structures. The two fourth bodies (501) are arranged opposite each other, and the two fifth protrusions (502) are arranged opposite each other and located between the two fourth bodies (501). The four bearing segments (503) are arranged opposite each other in pairs and are located on the upper and lower four end faces of the two fourth bodies (501). The bearing segments (503) are cylindrical symmetrical structures used to pass through the rolling bearings (10). The fifth bracket (6) is composed of a fifth body (601) and two sixth protrusions (602). The fifth body (601) and the sixth protrusions (602) are both symmetrical rectangular parallelepiped structures. The two sixth protrusions (602) are arranged opposite each other and are located on the right end face of the fifth body (601). The right end face of the fifth body (601) is symmetrically provided with four cylindrical fourth through holes (603), and the bolts (9) are inserted into the fourth through holes (603). A cylindrical third groove (604) is provided in the middle part of the upper end face of the sixth protrusion (602), and the rolling bearing (10) is inserted into the third groove (604). A cylindrical fifth through hole (605) is provided in the axial part of the third groove (604), and the bearing section (503) of the fourth bracket (5) is inserted into the fifth through hole (605). The horizontal cross section of the module (2) is a symmetrical structure in the shape of an arc, with the central angle of the arc being 90 degrees. The front end face of the module (2) is a curved surface, the curvature of which should be equal to the curvature of the standard inner circle of the coupling blank, for internal rounding of the coupling blank. The rear end face of the module (2) is a plane, with two sets of eight second screw holes (201) symmetrically opened on the plane, and the bolts (9) are screwed into the second screw holes (201).

2. The inner rounding device for the constraint-type coupling blank according to claim 1, characterized in that, The linear bearing (7) is composed of a sixth body (701) and eight seventh protrusions (702). The sixth body (701) is a symmetrical rectangular parallelepiped structure. The eight seventh protrusions (702) are divided into two groups, with the four seventh protrusions (702) in each group arranged opposite each other and simultaneously located on the right end face of the sixth body (701). The right end face of the sixth body (701) is symmetrically provided with two groups of eight third screw holes (703). The bolt (9) is screwed into the three-hole (703); the seventh boss (702) is a cylindrical symmetrical structure, and a cylindrical sixth through hole (704) is opened on the axial part of the seventh boss (702). The middle part of the connecting rod (8) is inserted into the sixth through hole (704), and the sixth through hole (704) also penetrates the sixth body (701). The seventh boss (702) is also provided with a retainer, ball bearings and retaining ring.

3. The inner rounding device for the constraint-type coupling blank according to claim 1, characterized in that, The connecting rod (8) has a cylindrical symmetrical structure. The middle part of the connecting rod (8) passes through the sixth through hole (704) of the linear bearing (7), and the two ends of the connecting rod (8) pass through the first groove (305) of the second bracket (3).

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