An inner rounding device for open collar blank

Abstract

The utility model discloses an inner rounding device of open type coupling blank belongs to the technical field of coupling production rounding equipment. The inner rounding device of open type coupling blank provided includes one first support, four second supports, one third support, two fourth supports, four fifth supports, four linear bearings, thirty -six bolts and eight rolling bearings, and the device can realize the purpose of internal rounding of the coupling blank with the eccentricity, 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 an open 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 an open coupling blank. The combined use of the first bracket and bolts can achieve both the pairwise relative arrangement of the four second brackets and the positioning of the third bracket; the combined use of the fourth bracket and bolts can achieve the pairwise relative arrangement of the four linear bearings, and the use of the third bracket can enable the linear bearings to move back and forth in the horizontal direction; the combined use of the second bracket and rolling bearings can enable the positioning and swinging of the fifth bracket, thereby enabling the two fourth brackets to move back and forth in the horizontal direction; the combined use of the two fourth brackets can achieve the purpose of rounding the inner surface of the coupling blank from the front and rear 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 internal rounding device for open coupling blanks provided by this utility model includes a first support, four second supports, a third support, two fourth supports, four fifth supports, four linear bearings, thirty-six bolts, and eight rolling bearings.

[0010] The first bracket is composed of a first body, four first protrusions, and four second protrusions connected together. The first body, the first protrusions, and the second protrusions are all symmetrical rectangular parallelepiped structures. The four first protrusions are arranged opposite each other in pairs and are located on the upper end face of the first body. The four second protrusions are also arranged opposite each other in pairs and are located on the upper end face of the first body. The left end face of the first protrusion has two sets of four cylindrical first through holes symmetrically opened, and the bolts are inserted into the first through holes. The upper end face of the second protrusion has a first screw hole in the middle part, and the bolts are screwed into the first screw hole.

[0011] The second bracket consists of a second body and two third protrusions connected together. Both the second body and the third protrusions are symmetrical rectangular parallelepiped structures. The two third protrusions are arranged opposite each other and are located on the right end face of the second body. A second screw hole is opened at each of the four corners of the right end face of the second body, and the bolt is screwed into the second screw hole. A cylindrical groove is opened in the middle of the upper surface of the third protrusion, and the rolling bearing passes through the groove. A cylindrical second through hole is opened at the axis of the groove, and the bearing section of the fifth bracket passes through the second through hole.

[0012] The third bracket is composed of a fourth body, a fifth protrusion, and sixteen sixth protrusions connected together. The fourth body and the fifth protrusion are both symmetrical cuboid structures. The fifth protrusion is located on the upper end face of the fourth body. The sixteen sixth protrusions are divided into four groups, with the four sixth protrusions in each group arranged opposite each other and simultaneously located on the front or rear end face of the fifth protrusion. The upper end face of the fourth body has four symmetrical cylindrical fifth through holes, and the bolts are inserted into the fifth through holes. The sixth protrusions are symmetrical cylindrical structures and are inserted into the fourth through holes of the linear bearing.

[0013] The fourth bracket consists of a fifth body and four seventh protrusions connected together. The four seventh protrusions are arranged opposite each other in pairs and are simultaneously located on the rear end face of the fifth body. The horizontal cross-section of the fifth body is a symmetrical structure in the shape of an arc, with a central angle of 90 degrees. The front end face of the fifth body is a curved surface, the curvature of which should be equal to the curvature of the standard inner circle of the coupling blank, used for internal rounding of the coupling blank. The rear end face of the fifth body is a plane, with two symmetrically arranged cuboid-shaped sixth through holes. The four fourth protrusions of the linear bearing are inserted into the sixth through holes. Four third screw holes are evenly arranged around the sixth through holes, and the bolts are screwed into the third screw holes. The horizontal cross-section of the seventh protrusion is a symmetrical structure in the shape of a semicircle, and the rear end face of the seventh protrusion can be moved by the ninth protrusion of the fifth bracket.

[0014] The fifth bracket is composed of a sixth body, two eighth protrusions, two ninth protrusions, and two bearing sections connected together. The sixth body and the eighth protrusions are both symmetrical cuboid structures. The two eighth protrusions are arranged opposite each other and are located on the right end face of the sixth body. The two ninth protrusions are arranged opposite each other and are located on the right end face of the two eighth protrusions respectively. The two bearing sections are arranged opposite each other and are located on the upper and lower end faces of the sixth body respectively. The horizontal cross-section of the ninth protrusion is a symmetrical semi-circular structure, used to move the seventh protrusion of the fourth bracket. The bearing section is a symmetrical cylindrical structure, used to pass through the rolling bearing.

[0015] In some embodiments, the linear bearing consists of a third body and four fourth bosses connected together. The third body has a symmetrical rectangular parallelepiped structure, and the four fourth bosses are arranged opposite each other in pairs and are located on the rear end face of the third body. A cylindrical third through hole is opened at each of the four corners of the rear end face of the third body, and the bolt passes through the third through hole. The fourth boss has a symmetrical cylindrical structure, and a cylindrical fourth through hole is opened at the axial part of the fourth boss. A sixth boss of the third bracket passes through the fourth through hole, and the fourth through hole also penetrates the third body. A cage, balls and retaining rings are also provided inside the fourth boss.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1) The internal rounding device for open coupling blanks provided by this utility model includes a first bracket, four second brackets, a third bracket, two fourth brackets, four fifth brackets, four linear bearings, thirty-six bolts and eight rolling bearings. Since the materials are common and easy to process and form, the manufacturing cost of this utility model device is relatively low.

[0018] 2) When using this utility model device, initially all four fifth supports are in a relaxed position, and both fourth supports are in their initial positions. The heated coupling blank is passed through the four first protrusions and erected on the first body. With Q as the swing axis, four servo motors are driven in the forward direction simultaneously. ①, ②, ③, and ④ can simultaneously swing forward at a uniform speed of 90 degrees, allowing the two curved surfaces to perform internal rounding of the coupling blank from the front and back directions. With Q as the swing axis, four servo motors are driven in the reverse direction simultaneously. ①, ②, ③, and ④ can simultaneously swing in the reverse direction at a uniform speed of 90 degrees. Along the sixth protrusion, the four linear bearings are brought closer together, and the two fourth supports return to their initial positions. The coupling blank is rotated 90 degrees horizontally. With Q as the swing axis, four servo motors are driven in the forward direction simultaneously. ①, ②, ③, and ④ can simultaneously swing forward at a uniform speed of 90 degrees, allowing the two curved surfaces to perform internal rounding of the coupling blank from the front and back directions. Therefore, the operation of this utility model device is relatively simple.

[0019] 3) This utility model device adopts a symmetrical structure design. The combined use of the first bracket and bolts can realize the pairwise relative setting of the four second brackets and the positioning setting of the third bracket; the combined use of the fourth bracket and bolts can realize the pairwise relative setting of the four linear bearings, and the use of the third bracket can realize the forward and backward movement of the linear bearings along the horizontal direction; the combined use of the second bracket and rolling bearings can realize the positioning and swinging of the fifth bracket, which can then move the two fourth brackets forward and backward along the horizontal direction; the combined use of the two fourth brackets can realize the purpose of rounding the inner surface of the hoop blank from the front and back directions. Therefore, the effect of this utility model device is relatively good.

[0020] The open-type coupling blank internal rounding device provided by this utility model can achieve the purpose of internal rounding of coupling blanks with non-roundness. This utility model device has the characteristics of low manufacturing cost, simple operation and good use effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the internal rounding device for the open coupling blank of this utility model.

[0022] Figure 2 This is a left-side structural diagram of the internal rounding device for the open coupling blank of this utility model when the fifth bracket is arranged in a front-to-back configuration.

[0023] Figure 3 This is a top view of the internal rounding device for the open coupling blank of this utility model before rounding the coupling blank.

[0024] Figure 4 This is a top view of the internal rounding device for the open coupling blank of this utility model after rounding the coupling blank.

[0025] Figure 5 This is a schematic diagram of the left-side structure of the first support of this utility model;

[0026] Figure 6 This is a top view of the first support structure of this utility model;

[0027] Figure 7 This is a right-side view of the structure of the second support of this utility model;

[0028] Figure 8 This is a top view of the structure of the second bracket and a rolling bearing assembled according to the present invention.

[0029] Figure 9 This is a schematic diagram of the main structure of the linear bearing of this utility model;

[0030] Figure 10 This is a schematic diagram of the left side of the linear bearing of this utility model;

[0031] Figure 11 This is a schematic diagram of the left-side structure of the third support of this utility model;

[0032] Figure 12 This is a top view of the third support structure of this utility model;

[0033] Figure 13 This is a schematic diagram of the main structure of the fourth bracket of this utility model;

[0034] Figure 14 This is a top view of the fourth support structure of this utility model;

[0035] Figure 15 This is a schematic diagram of the main structure of the fifth bracket of this utility model;

[0036] Figure 16 This is a top view of the fifth support structure of this utility model;

[0037] Figure 17 This is a top view of the forward swing structure of the fifth support of this utility model when it is changed from a left-right arrangement to a front-back arrangement;

[0038] Figure 18 This is a top view of the reverse swing structure of the fifth support of this utility model when it is changed from a front-to-back arrangement to a left-to-right arrangement.

[0039] Figure 19 This is a schematic diagram illustrating the working principle of the open-type coupling blank inner rounding device of this utility model.

[0040] Explanation of reference numerals in the attached drawings: 1-First bracket; 101-First body; 102-First boss; 103-Second boss; 104-First through hole; 105-First screw hole; 2-Second bracket; 201-Second body; 202-Third boss; 203-Second screw hole; 204-Groove; 205-Second through hole; 3-Linear bearing; 301-Third body; 302-Fourth boss; 303-Third through hole; 304-Fourth... 4-Third bracket; 401-Fourth body; 402-Fifth boss; 403-Sixth boss; 404-Fifth through hole; 5-Fourth bracket; 501-Fifth body; 502-Seventh boss; 503-Sixth through hole; 504-Third screw hole; 6-Fifth bracket; 601-Sixth body; 602-Eighth boss; 603-Ninth boss; 604-Bearing section; 7-Bolt; 8-Rolling bearing; 9-Coupling blank. Detailed Implementation

[0041] 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.

[0042] Combination Figures 1 to 4 As shown, this utility model provides an internal rounding device for an open-type coupling blank, which includes a first support 1, four second supports 2, a third support 4, two fourth supports 5, four fifth supports 6, four linear bearings 3, thirty-six bolts 7, and eight rolling bearings 8; wherein, four second bodies 201 of the four second supports 2 are arranged in pairs between the four first bosses 102 of the first support 1, and are connected by the sixteen bolts 7; eight rolling bearings 8 are inserted into the eight grooves 204 of the four second supports 2, and eight bearing segments 604 of the four fifth supports 6 are inserted into the eight rolling bearings 8. The upper end face of the four second protrusions 103 of the first bracket 1 is provided with a fourth body 401 of the third bracket 4, and is connected by four bolts 7; the sixteen middle parts of the sixteen sixth protrusions 403 of the third bracket 4 are respectively inserted into the sixteen fourth through holes 304 of the four opposing linear bearings 3, and the sixteen ends of the sixteen sixth protrusions 403 are respectively inserted into the four sixth through holes 503 of the two opposing fourth brackets 5; the sixteen fourth protrusions 302 of the four linear bearings 3 are respectively inserted into the four sixth through holes 503 of the two fourth brackets 5, and are connected by sixteen bolts 7.

[0043] The present invention provides an assembly method for an internal rounding device for an open coupling blank.

[0044] Combination Figures 1 to 16As shown, firstly, the first bracket 1 is horizontally set, then the fourth body 401 of the third bracket 4 is set on the four upper surfaces of the four second protrusions 103 of the first bracket 1, and the four fifth through holes 404 of the third bracket 4 and the four first screw holes 105 of the first bracket 1 are aligned. Then, four bolts 7 are passed through the four fifth through holes 404 and screwed into the four first screw holes 105. In this way, the third bracket 4 and the first bracket 1 can be assembled.

[0045] Then, eight rolling bearings 8 are installed in the eight grooves 204 of the four second brackets 2. The four second brackets 2 are then arranged in pairs opposite each other. The eight bearing segments 604 of the four fifth brackets 6 are then respectively inserted into the eight rolling bearings 8. In this way, the four second brackets 2, the eight rolling bearings 8 and the four fifth brackets 6 can be assembled.

[0046] Then, the four second bodies 201 of the four second brackets 2 are simultaneously inserted between the four first protrusions 102 of the first bracket 1, and the sixteen second screw holes 203 of the four second brackets 2 are aligned with the sixteen first through holes 104 of the first bracket 1. Then, the sixteen bolts 7 are passed through the sixteen first through holes 104 and screwed into the sixteen second screw holes 203. In this way, the four second brackets 2 and the first bracket 1 can be assembled.

[0047] Then, the four linear bearings 3 are arranged in pairs facing each other, and the sixteen fourth bosses 302 are respectively inserted into the four sixth through holes 503 of the two fourth brackets 5. At this time, the sixteen third through holes 303 of the four linear bearings 3 and the sixteen third screw holes 504 of the two fourth brackets 5 are aligned. Then, the sixteen bolts 7 are passed through the sixteen third through holes 303 and screwed into the sixteen third screw holes 504. In this way, the four linear bearings 3 and the two fourth brackets 5 can be assembled.

[0048] Then, the two fourth brackets 5 are positioned opposite each other. Finally, the sixteen sixth protrusions 403 of the third bracket 4 are successively inserted into the sixteen fourth through holes 304 of the four linear bearings 3 and the four sixth through holes 503 of the two fourth brackets 5. In this way, the entire device is assembled and can be put into use.

[0049] The principle for setting the swing direction of the fifth support in the inner rounding device for the open coupling blank provided by this utility model.

[0050] Combination Figure 3 and Figure 4As shown in the top view of the present invention, for ease of description, the four fifth supports 6 arranged in pairs opposite each other can be numbered as follows: the fifth support 6 located at the front left is defined as ①, the fifth support 6 located at the front right is defined as ②, the fifth support 6 located at the rear right is defined as ③, and the fifth support 6 located at the rear left is defined as ④. The eight bearing segments 604 of the four fifth supports 6 can all serve as swing axes, and can all be designated as Q.

[0051] Combination Figure 3 As shown, assuming that initially all four fifth supports 6 are in a relaxed arrangement, that is, all eight eighth protrusions 602 are arranged horizontally, the simplified arrangement is as follows: Figure 17 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 fifth supports 6 are in working position, that is, all eight eighth protrusions 602 are arranged in a front-to-back manner. It is reasonable to define the swing directions of ①, ②, ③ and ④ as positive.

[0052] Combination Figure 4 As shown, assuming that initially all four fifth supports 6 are in working position, that is, all eight eighth protrusions 602 are arranged in a front-to-back configuration, the simplified configuration is as follows: Figure 18 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 fifth supports 6 are all in a relaxed arrangement, that is, the eight eighth protrusions 602 are all arranged left and right. We can define the swing directions of ①, ②, ③ and ④ as reverse.

[0053] The working principle of the internal rounding device for open coupling blanks provided by this utility model

[0054] Based on the fundamental knowledge of metallurgy, most oil casing uses high-quality carbon manganese steel as the raw material, and the production process includes 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 the internal 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 9 to 900°C in order to achieve austenitization of the microstructure.

[0055] 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 9, the inner rounding process cannot change the circumferential length of the coupling blank 9. The coupling blank 9 that needs to be rounded at the beginning has a certain degree of non-roundness. It is advisable to regard the coupling blank 9 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 9.

[0056] Combination Figure 19 As shown, to simplify operation, the curvature of the curved surface of the fifth body 501 should be equal to the curvature of the standard inner circle of the coupling blank 9, and the distance between the farthest points of the two curved surfaces of the two fifth bodies 501 that are arranged opposite each other should be equal to the standard inner diameter of the coupling blank 9. In this way, when all four fifth supports 6 are in working position, that is, when all eight eighth protrusions 602 are arranged in front and behind, the part in contact between the coupling blank 9 and the two curved surfaces of the two fifth bodies 501 is rounded inward.

[0057] Combination Figure 19 As shown, the inner radius of the coupling blank 9 can be defined as r, and the axis of the coupling blank 9 can be defined as O. When the eight eighth protrusions 602 are arranged in a front-to-back manner, the left and right edges of the fifth body 501 in the front position can be defined as A and B, and the left and right edges of the fifth body 501 in the back position can be defined as D and C, respectively. In order to improve the rounding effect, the first inner rounding should be performed with the relatively shorter inner diameter of the coupling blank 9 set along the front-to-back direction and the relatively longer inner diameter set along the left-to-right direction.

[0058] The horizontal cross-section of the fifth body 501 is arc-shaped, and the central angle of the arc is 90 degrees, that is, the fifth body 501 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 9. One internal rounding can complete the internal rounding of the front and rear right-angle sector areas of the coupling blank 9. Rotate the coupling blank 9 9 90 degrees along the horizontal direction and perform internal rounding again to complete the overall internal rounding of the coupling blank 9.

[0059] In order to achieve precise swinging of the four fifth supports 6, four couplings, four reducers and four servo motors can be installed on the four bearing sections 604 below the four fifth supports 6. Since the encoder can detect the rotor's position, speed and acceleration in time and feed this information back to the servo driver in time, the servo motor can be precisely controlled. 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 fifth supports 6 can be achieved.

[0060] 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.

[0061] The method of using the internal rounding device for open coupling blanks provided by this utility model

[0062] Step 1: Assume that initially, all four fifth supports 6 are in a relaxed configuration, that is, all eight eighth protrusions 602 are arranged horizontally, and both fourth supports 5 are in their initial positions. Then, the heated coupling blank 9 is passed through the four first protrusions 102 of the first support 1 and erected on the first body 101, 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 simultaneously, so that ①, ②, ③ and ④ can swing in the forward direction at a uniform speed of 90 degrees at the same time. During this period, the two curved surfaces of the two fourth supports 5 can perform internal rounding on the coupling blank 9 from the front-back direction.

[0063] Step 2: Then, using Q as the gyratory axis, drive four servo motors in the opposite direction simultaneously so that ①, ②, ③, and ④ can simultaneously gyrate in the opposite direction at a uniform speed of 90 degrees. Then, along the sixth protrusion 403 of the third bracket 4, bring the four linear bearings 3 closer together so that the two fourth brackets 5 return to their initial positions. Then, rotate the coupling blank 9 90 degrees horizontally. Then, using Q as the gyratory axis, drive four servo motors in the forward direction simultaneously so that ①, ②, ③, and ④ can simultaneously gyrate in the forward direction at a uniform speed of 90 degrees. During this period, the two curved surfaces of the two fourth brackets 5 can perform internal rounding on the coupling blank 9 from the front and rear directions. In this way, the overall internal rounding of the coupling blank 9 can be completed.

[0064] Supplementary Explanation: The open-type coupling blank internal rounding device 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 ensure 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 fifth supports, the two curved surfaces of the two fifth bodies can always perfectly fit with the inner surface of the coupling blank, thus achieving effective rounding. To ensure the roundness of the roundness and fully utilize the potential of the device, the height of the fifth body should be equal to the fixed length of the coupling blank. To simplify the operation process and improve the working efficiency of the device, when the eight eighth protrusions of the four fifth supports are arranged in a front-to-back manner, the two curved surfaces of the two fifth bodies are just above the standard inner surface of the coupling blank. The initial position of the two fourth supports refers to the position where the two curved surfaces can maintain an appropriate distance from the inner surface of the coupling blank when the two fourth supports are in the initial position. This appropriate distance can facilitate the coupling blank to pass smoothly through the two fifth bodies and facilitate the eight ninth protrusions to smoothly move the eight seventh protrusions.

[0065] As can be seen from the embodiments, the internal rounding device for open coupling blanks provided by this utility model can achieve the purpose of internal rounding of coupling blanks with non-roundness. This utility model device has the characteristics of low manufacturing cost, simple operation and good use effect.

[0066] 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 an open-type coupling blank, characterized in that, The internal rounding device for the open coupling blank includes: one first bracket (1), four second brackets (2), one third bracket (4), two fourth brackets (5), four fifth brackets (6), four linear bearings (3), thirty-six bolts (7), and eight rolling bearings (8), wherein: The first bracket (1) is composed of a first body (101), four first protrusions (102) and four second protrusions (103). The first body (101), the first protrusions (102) and the second protrusions (103) are all symmetrical rectangular parallelepiped structures. The four first protrusions (102) are arranged opposite each other in pairs and are located on the upper end face of the first body (101). The four second protrusions (103) are arranged opposite each other in pairs and are located on the upper end face of the first body (101). The left end face of the first protrusion (102) is symmetrically provided with two sets of four cylindrical first through holes (104). The bolts (7) are inserted into the first through holes (104). The middle part of the upper end face of the second protrusion (103) is provided with a first screw hole (105). The bolts (7) are screwed into the first screw hole (105). The second bracket (2) is composed of a second body (201) and two third protrusions (202). The second body (201) and the third protrusions (202) are both symmetrical rectangular parallelepiped structures. The two third protrusions (202) are arranged opposite to each other and are located on the right end face of the second body (201). A second screw hole (203) is opened at each of the four corners of the right end face of the second body (201), and the bolt (7) is screwed into the second screw hole (203). A cylindrical groove (204) is opened in the middle part of the upper end face of the third protrusion (202), and the rolling bearing (8) passes through the groove (204). A cylindrical second through hole (205) is opened at the axis of the groove (204), and the bearing section (604) of the fifth bracket (6) passes through the second through hole (205). The third bracket (4) is composed of a fourth body (401), a fifth boss (402), and sixteen sixth bosses (403). The fourth body (401) and the fifth boss (402) are both rectangular parallelepiped symmetrical structures. The fifth boss (402) is located on the upper end face of the fourth body (401). The sixteen sixth bosses (403) are divided into four groups. The four sixth bosses (403) in each group are arranged opposite each other and are located on the front end face or rear end face of the fifth boss (402). The upper end face of the fourth body (401) is symmetrically provided with four cylindrical fifth through holes (404). The bolts (7) are inserted into the fifth through holes (404). The sixth bosses (403) are cylindrical symmetrical structures and are inserted into the fourth through holes (304) of the linear bearing (3). The fourth support (5) is composed of a fifth body (501) and four seventh protrusions (502). The four seventh protrusions (502) are arranged opposite each other and are located on the rear end face of the fifth body (501). The horizontal cross-section of the fifth body (501) is a symmetrical structure in the shape of an arc, with a central angle of 90 degrees. The front end face of the fifth body (501) is a curved surface, and the curvature of the curved surface should be equal to the curvature of the standard inner circle of the coupling blank, used for internal rounding of the coupling blank. The rear end face of the fifth body (501) The plane is a plane with two rectangular sixth through holes (503) symmetrically opened. The fourth bosses (302) of the linear bearing (3) are inserted through the sixth through holes (503). Four third screw holes (504) are evenly opened around the sixth through holes (503). The bolts (7) are screwed into the third screw holes (504). The horizontal cross section of the seventh boss (502) is a symmetrical structure in the shape of a semicircle. The rear end face of the seventh boss (502) can be moved by the ninth boss (603) of the fifth bracket (6). The fifth bracket (6) is composed of a sixth body (601), two eighth protrusions (602), two ninth protrusions (603), and two bearing sections (604). The sixth body (601) and the eighth protrusions (602) are both rectangular parallelepiped symmetrical structures. The two eighth protrusions (602) are arranged opposite each other and are located on the right end face of the sixth body (601). The two ninth protrusions (603) are arranged opposite each other and are located on the right end face of the two eighth protrusions (602). The two bearing sections (604) are arranged opposite each other and are located on the upper and lower end faces of the sixth body (601). The horizontal cross section of the ninth protrusion (603) is a semi-circular symmetrical structure, used to move the seventh protrusion (502) of the fourth bracket (5). The bearing section (604) is a cylindrical symmetrical structure, used to pass through the rolling bearing (8).

2. The internal rounding device for open-type coupling blanks according to claim 1, characterized in that, The linear bearing (3) is composed of a third body (301) and four fourth bosses (302). The third body (301) is a symmetrical rectangular parallelepiped structure. The four fourth bosses (302) are arranged opposite each other and are located on the rear end face of the third body (301). A cylindrical third through hole (303) is opened at each of the four corners of the rear end face of the third body (301). The bolt (7) is inserted through the third through hole (303). The fourth boss (302) is a symmetrical cylindrical structure. A cylindrical fourth through hole (304) is opened at the axial part of the fourth boss (302). The sixth boss (403) of the third bracket (4) is inserted through the fourth through hole (304). The fourth through hole (304) also penetrates the third body (301). A cage, ball and retainer are also provided inside the fourth boss (302).

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