Scribing device for quartering circumferential direction of inner wall of steel pipe

Abstract

The utility model discloses a scribing device for quartering the circumferential direction of the inner wall of a steel pipe, and belongs to the technical field of auxiliary scribing equipment for steel pipe machining. The scribing device for quartering the inner wall of the steel pipe in the circumferential direction comprises a first support, four second supports, two third supports, four fourth supports, four fifth supports, a linear bearing, four refills, twenty-four screws, eight rolling bearings and four springs. The device can achieve the purpose of quartering longitudinal scribing in the circumferential direction of the inner wall of the steel pipe, and has the advantages of being low in manufacturing cost, easy to operate and good in using effect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of auxiliary marking device for steel pipe processing, and particularly relates to a marking device for four equal division of the circumferential direction of the inner wall of a steel pipe. BACKGROUND

[0002] At present, compared with other section profiles, steel pipes have relatively high resistance to bending and resistance to torsion, and therefore, steel pipes are widely used in the field of mechanical manufacturing and the field of structural engineering; sometimes, it is necessary to perform four equal division marking in the circumferential direction on the inner wall of a steel pipe so as to process grooves on the inner wall of the steel pipe, calibrate installation positions, or measure internal dimensions, but there are relatively few professional devices for performing four equal division marking in the circumferential direction on the inner wall of a steel pipe, and usually, enterprises perform four equal division marking in the circumferential direction on the inner wall of a steel pipe by using a right-angle caliper, but the marking precision and marking efficiency of this method are relatively limited.

[0003] After searching, it is found that there are three patent documents and the utility model technology is most relevant, and the specific content is described as follows:

[0004] Patent document CN 202023257980.3 discloses a four-equal-division punching device, which mainly comprises a punching knife, a pressing block, a fixing seat, an air cylinder, a placing table, and a fixing die, and has the characteristics of exquisite design, ingenious design, simultaneous punching of a three-dimensional part fixed at the middle part in four directions, simple component structure, accurate four-equal-division punching, and high production efficiency, but the device is only suitable for four-equal-division punching of a three-dimensional part and is not suitable for four-equal-division marking in the circumferential direction of the inner wall of a steel pipe.

[0005] Patent document CN 201220256041.3 discloses a four-equal-division drilling device for a generator shaft, which mainly comprises a bottom plate, a fixing plate, a drilling template, a mandrel, a rotating disc, a positioning pin, a spring, a pressing plate, a milling head, and a nut, and has the characteristics of ingenious design, 90° rotation of the rotating disc and the positioning pin for four-equal-division drilling, simple operation, accurate four-equal-division drilling, and high production efficiency, but the device is only suitable for four-equal-division drilling of a generator shaft and is not suitable for four-equal-division marking in the circumferential direction of the inner wall of a steel pipe.

[0006] Patent document CN 201720225447.8 discloses a four-equal-division cutting device for round tablets, which mainly comprises a box cover, a box body, a cross-shaped blade, a concave table, a hinge shaft, and a handle, and has the characteristics of ingenious design, accurate positioning of the tablets, four-equal-division cutting of the tablets, simple component structure, accurate four-equal-division cutting, and high production efficiency, but the device is only suitable for four-equal-division cutting of round tablets and is not suitable for four-equal-division marking in the circumferential direction of the inner wall of a steel pipe. UTILITY MODEL CONTENT

[0007] In order to overcome one or more problems existing in the prior art, the utility model provides a kind of marking device that four equal division is carried out to the circumference of steel pipe inner wall, the utility model is based on the design of symmetrical structure, the use of screw can realize the linkage of third support and linear bearing, the combined use of linear bearing and first support can realize the vertical lifting of third support;The combined use of third support and screw can realize the relative arrangement of four second supports, to further realize the relative arrangement of four fourth supports;The combined use of second support and rolling bearing can realize the positioning swing of fourth support, the combined use of fourth support and fifth support can realize the positioning of lead core, the use of spring can realize that lead core is four equal division in four directions of front, back, left and right in steel pipe inner wall, therefore, the use effect of the utility model device is relatively better.

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

[0009] The marking device that four equal division is carried out to the circumference of steel pipe inner wall provided by the utility model includes a first support, four second supports, two third supports, four fourth supports, four fifth supports, a linear bearing, four lead cores, twenty-four screws, eight rolling bearings and four springs.

[0010] The first support is connected and composed of a first body, four first bosses and four second bosses, the first body is the symmetrical structure of cuboid, four first bosses are oppositely arranged in pair and are simultaneously located on the upper end surface of the first body, four second bosses are oppositely arranged in pair and are simultaneously located on the upper end surface of the first body;The first boss is the symmetrical structure of cylinder, is used to pass through the first through-hole of linear bearing;The second boss is the symmetrical structure of cylinder, is used to position steel pipe from outside;

[0011] The second support is connected and composed of two third bodies and a fourth boss, the third body and the fourth boss are the symmetrical structure of cuboid, two third bodies are oppositely arranged, and the fourth boss is located between two third bodies;The middle part of the rear end surface of the third body is provided with a first recess in the form of cylinder, and the rolling bearing is arranged in the first recess;The axis part of the first recess is provided with a second through-hole in the form of cylinder, and the bearing section of the fourth support is arranged in the second through-hole;The fourth boss is symmetrically provided with four third through-holes in the form of cylinder, and the screw is arranged in the third through-hole;

[0012] The third support is connected by a fourth body, a fifth boss and two sixth bosses, the fourth body, the fifth boss and the sixth boss are all cuboid symmetrical structures, the fifth boss is located on the upper end face of the fourth body, and the two sixth bosses are oppositely arranged and respectively located on the front and rear end faces of the fifth boss; the middle part of the fourth body is symmetrically provided with four fourth through holes in the shape of a cylinder, and the third boss of the linear bearing is arranged in the fourth through hole; the fourth body is symmetrically provided with four fifth through holes in the shape of a cylinder, and the screw is arranged in the fifth through hole; the sixth boss is symmetrically provided with four second screw holes, and the screw is screwed in the second screw hole;

[0013] The fourth support is connected by a fifth body, a seventh boss and two bearing segments, the fifth body is a cuboid symmetrical structure, the seventh boss is located on the upper end face of the fifth body, and the two bearing segments are oppositely arranged and respectively located on the front and rear end faces of the fifth body; the seventh boss is a cylindrical symmetrical structure, an sixth through hole in the shape of a cylinder is arranged at the axis part of the seventh boss, and the pen core is arranged in the sixth through hole; the end part of the seventh boss is provided with external threads for screwing the internal threads of the fifth support; a second groove in the shape of a cylinder is arranged at the center part of the upper end face of the fifth body, the spring and the pen core are arranged in the second groove, and the second groove and the sixth through hole are coaxially connected; the bearing segment is a cylindrical symmetrical structure for arranging the rolling bearing;

[0014] The fifth support is connected by a coaxial sixth body and an eighth boss, the sixth body and the eighth boss are both cylindrical symmetrical structures, and the eighth boss is located on the upper end face of the sixth body; a third groove in the shape of a cylinder is arranged at the axis part of the lower end face of the sixth body, the pen core is arranged in the third groove, and the end part of the sixth body is provided with internal threads for screwing the external threads of the fourth support; an seventh through hole in the shape of a cylinder is arranged at the axis part of the eighth boss, the pen core is arranged in the seventh through hole, and the seventh through hole and the third groove are coaxially connected.

[0015] In some embodiments, the linear bearing is composed of a second body and eight third bosses, the second body is a symmetric structure of regular octagonal prism, and eight third bosses are oppositely arranged in pairs and located on the upper and lower end faces of the second body; the second body is symmetrically provided with eight first screw holes, and the screws are screwed in the first screw holes; the third boss is a symmetric structure of cylinder, a first through hole in the shape of cylinder is formed in the axial part of the third boss, the first boss of the first support is arranged in the first through hole, and the first through hole also penetrates the second body; the third boss is further provided with a retainer, balls and a check ring.

[0016] In some embodiments, the pen core, the screw, the rolling bearing and the spring are all standard parts.

[0017] The utility model discloses the beneficial effects are as follows:

[0018] 1) the utility model provides a lineation device that is divided into four equal parts to the circumference of the inner wall of steel pipe includes a first support, four second supports, two third supports, four fourth supports, four fifth supports, a linear bearing, four pen cores, twenty -four screws, eight rolling bearings and four springs, because the material is ordinary, and convenient processing into shape, therefore, the manufacturing cost of the utility model device is relatively lower.

[0019] 2) the utility model uses, four fourth supports are all in the folded setting initially, and the steel pipe is set up on the first body of first support in vertical, and four second bosses are all arranged outside the steel pipe, and ①, ②, ③ and ④ are simultaneously forward swing 90 degrees, then four fourth supports on the left and right sides and on the front and back sides become horizontal setting, the linear bearing is moved at uniform speed upwards along the first boss of first support, so that four fourth supports can move vertically upwards at uniform speed, and four pen cores can draw lines longitudinally in four directions of the inner wall of steel pipe during the swing of four fourth supports, therefore, the operation of the utility model device is relatively simple.

[0020] 3) the utility model is designed based on symmetric structure, the use of screw can realize the linkage of third support and linear bearing, the combined use of linear bearing and first support can realize the vertical lifting of third support, the combined use of third support and screw can realize the relative arrangement of four second supports, and then realize the relative arrangement of four fourth supports, the combined use of second support and rolling bearing can realize the positioning swing of fourth support, the combined use of fourth support and fifth support can realize the positioning of pen core, and the use of spring can realize the four equal part lineation of pen core in four directions of the inner wall of steel pipe, therefore, the use effect of the utility model device is relatively good.

[0021] The line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe can achieve the purpose of four equal division of the circumferential direction of the inner wall of the steel pipe, and has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a front view structural schematic diagram of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe when the fourth support is in the folded state;

[0023] Figure 2 It is a front view structural schematic diagram of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe when the fourth support is in the folded state;

[0024] Figure 3 It is a left view structural schematic diagram of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe when the fourth support is in the stretched state;

[0025] Figure 4 It is a top view structural schematic diagram of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe when marking the set steel pipe;

[0026] Figure 5 It is a front view structural schematic diagram of the mutual position relationship among the fifth support, the pen core, the spring and the fourth support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0027] Figure 6 It is a front view structural schematic diagram of the first support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0028] Figure 7 It is a top view structural schematic diagram of the first support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0029] Figure 8 It is a front view structural schematic diagram of the linear bearing of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0030] Figure 9 It is a top view structural schematic diagram of the linear bearing of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0031] Figure 10 It is a front view structural schematic diagram of the second support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0032] Figure 11 It is a top view structural schematic diagram of the second support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0033] Figure 12 It is a front view structural schematic diagram of the third support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0034] Figure 13 It is a left view structural schematic diagram of the third support of the line marking device for four equal division of the circumferential direction of the inner wall of a steel pipe;

[0035] Figure 14 It is the overhead structure schematic view of the third support of the utility model;

[0036] Figure 15 It is the left view structure schematic view of the fourth support of the utility model;

[0037] Figure 16 It is the overhead structure schematic view of the fourth support of the utility model;

[0038] Figure 17 It is the section structure schematic view of the fourth support along M-M of the utility model;

[0039] Figure 18 It is the front view structure schematic view of the fifth support of the utility model;

[0040] Figure 19 It is the overhead structure schematic view of the fifth support of the utility model;

[0041] Figure 20 It is the bottom view structure schematic view of the fifth support of the utility model;

[0042] Figure 21 It is the section structure schematic view of the fifth support along N-N of the utility model;

[0043] Figure 22 It is the schematic diagram of the fourth support of the utility model in position is above positive rotation;

[0044] Figure 23 It is the schematic diagram of the fourth support of the utility model in position is above reverse rotation;

[0045] Figure 24 It is the schematic diagram of the fourth support of the utility model in position is below positive rotation;

[0046] Figure 25 It is the schematic diagram of the fourth support of the utility model in position is below reverse rotation;

[0047] Figure 26 It is the working principle schematic diagram of the marking device of the utility model to the circumference of steel pipe inner wall four equal division.

[0048] Explanation of reference numerals: 1 - first bracket; 101 - first body; 102 - first boss; 103 - second boss; 2 - linear bearing; 201 - second body; 202 - third boss; 203 - first screw hole; 204 - first through hole; 3 - second bracket; 301 - third body; 302 - fourth boss; 303 - first recess; 304 - second through hole; 305 - third through hole; 4 - third bracket; 401 - fourth body; 402 - fifth boss; 403 - sixth boss; 404 - fourth through hole; 405 - fifth through hole; 406 - second screw hole; 5 - fourth bracket; 501 - fifth body; 502 - seventh boss; 503 - bearing section; 504 - second recess; 505 - sixth through hole; 6 - fifth bracket; 601 - sixth body; 602 - eighth boss; 603 - third recess; 604 - seventh through hole; 7 - refill; 8 - screw; 9 - rolling bearing; 10 - spring; 11 - steel pipe. DETAILED DESCRIPTION

[0049] The content of the present application is explained in detail below through examples and drawings, and the examples are only for understanding the present application and do not limit the content of the present application.

[0050] In combination Figures 1 to 5The utility model provides a kind of steel pipe inner wall circumferential four equal division marking device, it includes a first support 1, four second supports 3, two third supports 4, four fourth supports 5, four fifth supports 6, a linear bearing 2, four pen cores 7, twenty-four screws 8, eight rolling bearings 9 and four springs 10;Wherein, the upper end surface of the second body 201 of the linear bearing 2 is provided with one fourth body 401 of the third support 4, and is connected by four the screw 8, four third bosses 202 of the linear bearing 9 position on are passed in four fourth through holes 404 of the third support 4;The lower end surface of the second body 201 of the linear bearing 2 is provided with another fourth body 401 of the third support 4, and is connected by four the screw 8, four third bosses 202 of the linear bearing 2 position on are passed in four fourth through holes 404 of the third support 4;The front and rear two end faces of the two sixth bosses 403 of the third support 4 on position are provided with the two fourth bosses 302 of the two second supports 3 opposite, and are connected by eight the screw 8;The left and right two end faces of the two sixth bosses 403 of the third support 4 on position are provided with the two fourth bosses 302 of the other two second supports 3 opposite, and are connected by eight the screw 8;Eight first recesses 303 of four the second supports 3 are passed in eight the rolling bearings 9, and four the fourth supports 5 of two two opposite eight bearing sections 503 are passed in eight the rolling bearings 9;Four second recesses 504 and four sixth through holes 505 of four the fourth supports 5 are passed in four the spring 10 and a part of four the pen core 7, another part of four the pen core 7 is passed in four third recesses 603 and four seventh through holes 604 of four the fifth support 6, and four the fifth support 6 and four the fourth support 5 are connected by internal thread and external thread;The fifth boss 402 of the third support 4 on position is set on the first body 101 of the first support 1, and four first bosses 102 of the first support 1 are respectively passed in four first through holes 204 of the linear bearing 2.

[0051] The utility model provides a kind of steel pipe inner wall circumferential four equal division marking device's assembly process

[0052] Combined Figures 1 to 21As shown, first, one of the linear bearings 2 is horizontally arranged, then the fourth body 401 of one of the third supports 4 is arranged on the upper end face of the second body 201 of the linear bearing 2, at the same time, the four third bosses 202 of the linear bearing 2 are simultaneously arranged in the four fourth through holes 404 of the third support 4, at this time, the four fifth through holes 405 of the third support 4 and the four first screw holes 203 at the front and rear ends of the linear bearing 2 are in the centered state, then the four screws 8 are arranged through the four fifth through holes 405 and screwed into the four first screw holes 203, in this way, the third support 4 and the linear bearing 2 can be assembled;

[0053] Then, the four rolling bearings 9 are arranged in the four first recesses 303 of the two second supports 3, then the two second supports 3 are arranged oppositely, then the four bearing segments 503 of the two fourth supports 5 are arranged in the four rolling bearings 9, in this way, the two second supports 3, the four rolling bearings 9 and the two fourth supports 5 can be assembled;

[0054] Then, the two fourth bosses 302 of the two second supports 3 are arranged outside the front and rear end faces of the two sixth bosses 403 of the third support 4, at the same time, the eight third through holes 305 of the two second supports 3 and the eight second screw holes 406 of the third support 4 are centered, then the eight screws 8 are arranged through the eight third through holes 305 and screwed into the eight second screw holes 406, in this way, the two second supports 3 and the third support 4 can be assembled;

[0055] Then, the fourth body 401 of another third support 4 is arranged on the lower end face of the second body 201 of the linear bearing 2, at the same time, the four third bosses 202 of the linear bearing 2 are simultaneously arranged in the four fourth through holes 404 of the third support 4, at this time, the four fifth through holes 405 of the third support 4 and the four first screw holes 203 at the left and right ends of the linear bearing 2 are in the centered state, then the four screws 8 are arranged through the four fifth through holes 405 and screwed into the four first screw holes 203, in this way, the third support 4 and the linear bearing 2 can be assembled;

[0056] Then four rolling bearings 9 are installed in four first grooves 303 of the other two second supports 3, and then the two second supports 3 are oppositely arranged, and then four bearing segments 503 of the other two fourth supports 5 are respectively penetrated into the four rolling bearings 9, so that the other two second supports 3, the four rolling bearings 9 and the other two fourth supports 5 are assembled;

[0057] Then two fourth bosses 302 of the other two second supports 3 are sleeved outside left and right two end faces of two sixth bosses 403 of the third support 4 located below, eight third through holes 305 of the two second supports 3 and eight second screw holes 406 of the third support 4 are centered, and then eight screws 8 are penetrated through the eight third through holes 305 and screwed into the eight second screw holes 406, so that the other two second supports 3 and the third support 4 located below are assembled;

[0058] Then four springs 10 and a part of four pen cores 7 are sequentially penetrated into four second grooves 504 and four sixth through holes 505 of the four fourth supports 5, and then another part of the four pen cores 7 is penetrated into four third grooves 603 and four seventh through holes 604 of the four fifth supports 6, and then the four fifth supports 6 and the four fourth supports 5 are screwed through internal threads and external threads, so that the four fourth supports 5, the four springs 10, the four pen cores 7 and the four fifth supports 6 are assembled;

[0059] Then one first support 1 is horizontally arranged, and four second bosses 103 are simultaneously arranged upwards, and finally four first bosses 102 of the first support 1 are respectively penetrated into four first through holes 204 of the linear bearing 2, so that the whole device is assembled and can be put into use.

[0060] The fourth support of the marking device for four equal division of the circumferential direction of the inner wall of the steel pipe is arranged above

[0061] Combined Figure 1 And Figure 2 As shown in the front view structural schematic diagram of the device, in order to facilitate description, the two fourth supports 5 located above are defined as ① and ②, wherein the four bearing segments 503 of the two fourth supports 5 are all swing shafts;

[0062] Suppose that at the beginning, the two fourth supports 5 are both in a folded arrangement, that is, the two fourth supports 5 located on the left and right sides are both arranged upwards, at this time, the two pen cores 7 cannot mark, and after simplificationFigure 22 As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction.

[0063] As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction. Figure 23 As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction.

[0064] The definition rule of the rotating direction of the lower fourth support of the line marking device for four equal division of the circumferential direction of the inner wall of the steel pipe

[0065] Combined with Figure 3 As shown in the figure, based on the left view structural schematic diagram of the device, for the convenience of description, the two fourth supports 5 in the lower position are defined as ③ and ④, respectively, wherein the four bearing sections 503 of the two fourth supports 5 are all rotating shafts.

[0066] As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction. Figure 24 As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction.

[0067] As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction. Figure 25 As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction.

[0068] The working principle of the line marking device for four equal division of the circumferential direction of the inner wall of the steel pipe

[0069] As shown in the figure, the ① rotates 90 degrees in the clockwise direction, and the ② rotates 90 degrees in the counterclockwise direction, so that the two fourth supports 5 are both in a horizontal arrangement, and the rotating direction of the two fourth supports 5 in the upper position is defined as a forward direction. Figure 4As shown, based on the overhead structure schematic diagram of the device, in order to facilitate the description, the two pen cores 7 in the upper position are defined as A and C, the A and the C can be vertical in the left and right two directions of the steel pipe 11 Line, the corresponding two lines are defined as point A and point C; The two pen cores 7 in the lower position are defined as B and D, the B and the D can be vertical in the front and rear two directions of the steel pipe 11, and the corresponding two lines are defined as point B and point D; The eight side edges of the second body 201 of the linear bearing 2 are defined as point E, point F, point G, point H, point I, point J, point K and point L; The axis of the steel pipe 11 is defined as point O, the point O and the point A are connected, the intersection line segment EF is at point P, the point O and the point B are connected, the intersection line segment GH is at point Q, the point O and the point C are connected, the intersection line segment IJ is at point R, the point O and the point D are connected, and the intersection line segment KL is at point S.

[0070] According to the knowledge point that the internal angle sum of the plane pentagon is 540°, in the pentagon POQGF, ∠POQ+∠OQG+∠QGF+∠GFP+∠FPO=540°; Since the utility model adopts a symmetrical structure, therefore, the line segment OA is perpendicular to and bisects the line segment EF, the line segment OB is perpendicular to and bisects the line segment GH, the line segment OC is perpendicular to and bisects the line segment IJ, and the line segment OD is perpendicular to and bisects the line segment KL, that is, ∠OQG=∠FPO=90°; Since the second body 201 of the linear bearing 2 is a regular octahedron, according to the knowledge point that the internal angle sum of the plane octagon is 1080°, in the regular octagon EFGHIJKL, eight internal angles are equal, therefore, ∠QGF=∠GFP=135°, from which it can be deduced that ∠POQ=90°;

[0071] The same method can be used to deduce that ∠QOR=∠ROS=∠SOP=90°, since ∠AOB=∠POQ=90°, ∠BOC=∠QOR=90°, ∠COD=∠ROS=90°, and ∠DOA=∠SOP=90°, therefore, it can be deduced that ∠AOB=∠BOC=∠COD=∠DOA; According to the knowledge point that the arc length corresponding to the equal central angle in the same circle is also equal, arc AB=arc BC=arc CD=arc DA, that is, point A, point B, point C and point D divide the entire circumference into four equal parts; Since the spring 10 has a self-balancing function, therefore, the four pen cores 7 can perform four-equal-division line marking in the circumferential direction of the inner wall of the steel pipe 11.

[0072] The use method of the line marking device for four-equal-division of the circumferential direction of the steel pipe inner wall

[0073] Step one: combination Figure 1As shown, initially, the four fourth supports 5 are in a folded arrangement, the steel pipe 11 is first arranged vertically on the first body 101 of the first support 1, and the four second bosses 103 are arranged outside the steel pipe 11, at this time, the linear bearing 2, the second support 3 and the third support 4 are arranged inside the steel pipe 11;

[0074] Step two: combination Figure 22 and Figure 24 As shown, then the ① and the ② are simultaneously forwardly swung by 90 degrees, the two fourth supports 5 located on the left and right sides are changed into horizontal arrangement, then the ③ and the ④ are simultaneously forwardly swung by 90 degrees, the two fourth supports 5 located on the front and back sides are changed into horizontal arrangement, so as to facilitate the four pen cores 7 to draw lines;

[0075] Step three: then the linear bearing 2 is uniformly moved upward along the four first bosses 102 of the first support 1, so that the four fourth supports 5 can be uniformly vertically moved upward, during which the four fourth supports 5 cannot be swung, the four pen cores 7 can draw longitudinal lines in the front, back, left and right four directions on the inner wall of the steel pipe 11, as shown in Figure 4 .

[0076] Supplementary explanation: the line drawing device for four equal division of the circumferential direction of the inner wall of the steel pipe provided by the utility model adopts a symmetrical structure for design, firstly, a plurality of specifications of the utility model device should be designed and manufactured to match the outer diameter specification of the steel pipe, the wall thickness specification of the steel pipe and the fixed length of the steel pipe; the spring should be slightly compressed in advance, that is, a compression force is applied to the spring in advance, so as to ensure that the pen core can contact the inner wall of the steel pipe in the front, back, left and right four directions by the elastic force and draw longitudinal lines.

[0077] As can be seen from the embodiments, the line drawing device for four equal division of the circumferential direction of the inner wall of the steel pipe provided by the utility model can achieve the purpose of four equal division of the circumferential direction of the inner wall of the steel pipe, and the utility model device has the characteristics of low manufacturing cost, simple operation and good use effect.

[0078] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and not for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features.

Claims

1. A scribe device for circumferentially quartering the inner wall of a steel pipe, characterized by, The line marking device for four equal division of the circumference of the inner wall of the steel pipe comprises a first support (1), four second supports (3), two third supports (4), four fourth supports (5), four fifth supports (6), a linear bearing (2), four pen cores (7), twenty-four screws (8), eight rolling bearings (9) and four springs (10), wherein: The first support (1) is connected by a first body (101), four first bosses (102) and four second bosses (103), the first body (101) is a cuboid symmetric structure, the four first bosses (102) are oppositely arranged and located on the upper end face of the first body (101), and the four second bosses (103) are oppositely arranged and located on the upper end face of the first body (101); the first boss (102) is a cylindrical symmetric structure, used for penetrating the first through hole (204) of the linear bearing (2); the second boss (103) is a cylindrical symmetric structure, used for positioning the steel pipe from the outside; The second support (3) is connected by two third bodies (301) and a fourth boss (302), the third body (301) and the fourth boss (302) are both cuboid symmetric structures, the two third bodies (301) are oppositely arranged, and the fourth boss (302) is located between the two third bodies (301); a cylindrical first recess (303) is formed in the middle part of the rear end face of the third body (301), and the rolling bearing (9) is penetrated in the first recess (303); a cylindrical second through hole (304) is formed in the axis part of the first recess (303), and the bearing segment (503) of the fourth support (5) is penetrated in the second through hole (304); four cylindrical third through holes (305) are symmetrically formed in the fourth boss (302), and the screws (8) are penetrated in the third through holes (305); The third support (4) is connected by a fourth body (401), a fifth boss (402) and two sixth bosses (403), the fourth body (401), the fifth boss (402) and the sixth boss (403) are all cuboid symmetric structures, the fifth boss (402) is located at the upper end face of the fourth body (401), and the two sixth bosses (403) are oppositely arranged and located at the front and rear end faces of the fifth boss (402); the middle part of the fourth body (401) is symmetrically provided with four fourth through holes (404) in the form of cylinders, and the third boss (202) of the linear bearing (2) is arranged in the fourth through hole (404); the fourth body (401) is symmetrically provided with four fifth through holes (405) in the form of cylinders, and the screw (8) is arranged in the fifth through hole (405); the sixth boss (403) is symmetrically provided with four second screw holes (406), and the screw (8) is screwed in the second screw hole (406); The fourth support (5) is connected by a fifth body (501), a seventh boss (502) and two bearing segments (503), the fifth body (501) is a cuboid symmetric structure, the seventh boss (502) is located at the upper end face of the fifth body (501), and the two bearing segments (503) are oppositely arranged and located at the front and rear end faces of the fifth body (501); the seventh boss (502) is a cylindrical symmetric structure, an sixth through hole (505) in the form of a cylinder is formed at the axis part of the seventh boss (502), and the pen core (7) is arranged in the sixth through hole (505); the end part of the seventh boss (502) is provided with external threads for screwing the internal threads of the fifth support (6); a second groove (504) in the form of a cylinder is formed at the center part of the upper end face of the fifth body (501), and the spring (10) and the pen core (7) are arranged in the second groove (504), the second groove (504) and the sixth through hole (505) are coaxially connected; the bearing segment (503) is a cylindrical symmetric structure for arranging the rolling bearing (9); The fifth support (6) is composed of a coaxial sixth body (601) and an eighth boss (602), the sixth body (601) and the eighth boss (602) are both cylindrical symmetrical structures, the eighth boss (602) is located at the upper end surface of the sixth body (601); the axis part of the lower end surface of the sixth body (601) is provided with a cylindrical third groove (603), the third groove (603) is provided with the pen core (7) therein, the end of the sixth body (601) is provided with internal threads for screwing the external threads of the fourth support (5); the axis part of the eighth boss (602) is provided with a cylindrical seventh through hole (604), the seventh through hole (604) is provided with the pen core (7) therein, the seventh through hole (604) and the third groove (603) are coaxially connected.

2. The scribing device for four-dividing the circumference of the inner wall of a steel pipe according to claim 1, characterized by The linear bearing (2) is composed of a second body (201) and eight third bosses (202), the second body (201) is a regular octagonal symmetrical structure, the eight third bosses (202) are oppositely arranged in pairs and located at the upper and lower end surfaces of the second body (201); the second body (201) is symmetrically provided with eight first screw holes (203), the first screw holes (203) are screwed with the screws (8) therein; the third boss (202) is a cylindrical symmetrical structure, the axis part of the third boss (202) is provided with a cylindrical first through hole (204), the first through hole (204) is provided with the first boss (102) of the first support (1) therein, the first through hole (204) also penetrates the second body (201), the third boss (202) is further provided with a retainer, balls and a check ring.

3. The scribing device for four-dividing the circumference of the inner wall of a steel pipe according to claim 1, characterized by The pen core (7), the screw (8), the rolling bearing (9) and the spring (10) are all standard parts.

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