Scribing device for quartering outer surface of steel pipe in circumferential direction

Abstract

The utility model discloses a circumferential quartering scribing device for the outer surface of a steel pipe, and belongs to the technical field of auxiliary scribing equipment for steel pipe machining. The scribing device for quartering the outer surface of the steel pipe in the circumferential direction comprises a first support, eight second supports, a third support, four fourth supports, four fifth supports, eight linear bearings, four refills, sixty-four screws, eight rolling bearings and four springs. The device can achieve the purpose of quartering longitudinal scribing in the circumferential direction of the outer surface 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 lineation equipment for steel pipe machining, and particularly relates to a lineation device for four equal divisions of the outer surface of a steel pipe. BACKGROUND

[0002] At present, compared with other section profiles, steel pipes have relatively high bending resistance and torsional resistance; 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 lineation on the outer surface of a steel pipe in order to process grooves on the outer surface of the steel pipe, calibrate installation positions, or measure external dimensions; however, there are relatively few professional devices for performing four equal division lineation on the outer surface of a steel pipe, and enterprises usually use a right-angle caliper to perform four equal division lineation on the outer surface of a steel pipe; however, the lineation precision and lineation efficiency of this method are relatively limited.

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

[0004] Patent document CN202023257980.3 discloses a four-equal-division punching device, which mainly includes a punching knife, a pressing block, a fixing seat, a gas cylinder, a placing table, and a fixing die; the device is designed with exquisite and ingenious structure, can simultaneously punch the four equal divisions of a three-dimensional part fixed in the middle part from the front, rear, left, and right directions, and has the characteristics of simple component structure, accurate four-equal-division punching, and high production efficiency; however, the device is only suitable for four-equal-division punching of a three-dimensional part, and is not suitable for four-equal-division lineation on the outer surface of a steel pipe.

[0005] Patent document CN201220256041.3 discloses a four-equal-division drilling device for a generator shaft, which mainly includes 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; the device is designed with ingenious structure, the combined use of the rotating disc and the positioning pin can conveniently rotate the generator shaft by 90°, and then perform four-equal-division drilling; the device has the characteristics of simple operation, accurate four-equal-division drilling, and high production efficiency; however, the device is only suitable for four-equal-division drilling of a generator shaft, and is not suitable for four-equal-division lineation on the outer surface of a steel pipe.

[0006] Patent document CN201720225447.8 discloses a four-equal-division cutting device for circular tablets, which mainly includes a box cover, a box body, a cross-shaped blade, a concave table, a hinge shaft, and a handle; the device is designed with ingenious structure, the combined use of the box cover, the box body, the concave table, and the cross-shaped blade can realize accurate positioning of the tablets and four-equal-division cutting of the tablets; the device has the characteristics of simple component structure, accurate four-equal-division cutting, and high production efficiency; however, the device is only suitable for four-equal-division cutting of circular tablets, and is not suitable for four-equal-division lineation on the outer surface of a steel pipe. Utility model content

[0007] In order to overcome one or more of the problems existing in the prior art, the utility model provides a kind of steel pipe outer surface circumferential four equal division's marking device, 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 eight 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 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 divided equally in four directions of front, back, left and right on the outer surface of steel pipe, 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 steel pipe outer surface circumferential four equal division's marking device provided by the utility model includes a first support, eight second supports, a third support, four fourth supports, four fifth supports, eight linear bearings, four lead cores, sixty-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 a symmetrical structure in the shape of cuboid, the four first bosses are oppositely arranged in pairs and simultaneously located on the upper end face of the first body, and the four second bosses are oppositely arranged in pairs and simultaneously located on the upper end face of the first body;The first boss is a symmetrical structure in the shape of cylinder, used for penetrating the second through hole of the linear bearing;The second boss is a symmetrical structure in the shape of cylinder, used for positioning the steel pipe from the outside;

[0011] The second support is connected and composed of a third body and a fourth boss, the third body and the fourth boss are both symmetrical structures in the shape of cuboid, and the fourth boss is located on the left end face of the third body;A first recess in the shape of cylinder is formed in the middle part of the rear end face of the third body, and the rolling bearing is penetrated into the first recess;A third through hole in the shape of cylinder is formed in the axial part of the first recess, and the bearing segment of the fourth support is penetrated into the third through hole;The fourth boss is symmetrically provided with four fourth through holes in the shape of cylinder, and the screws are penetrated into the fourth through holes;

[0012] The third support is connected by a fourth body, eight fifth bosses and eight sixth bosses, the fourth body, the fifth boss and the sixth boss are all cuboid symmetrical structures, eight fifth bosses are oppositely arranged in pairs and are located on the upper and lower end faces of the fourth body, and eight sixth bosses are oppositely arranged in pairs and are located on the upper end face of the fourth body; a cuboid-shaped fifth through hole is formed in the middle part of the fourth body, and a steel pipe is arranged in the fifth through hole; a cylindrical sixth through hole is formed in the middle part of the fifth boss, a third boss of the linear bearing is arranged in the sixth through hole, and the sixth through hole penetrates the fourth body; four first screw holes are uniformly formed around the sixth through hole, and the screws are screwed in the first screw holes; four second screw holes are symmetrically formed in the sixth boss, and the screws are screwed in the second screw holes;

[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 located on the left and right end faces of the fifth body; the seventh boss is a cylindrical symmetrical structure, a cylindrical seventh through hole is formed in the axial part of the seventh boss, and the pen core is arranged in the seventh through hole; the end part of the seventh boss is provided with external threads for screwing the internal threads of the fifth support; a cylindrical second groove is formed in the central 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 seventh 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 cylindrical third groove is formed in the axial 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 eighth through hole is formed in the axial part of the eighth boss, the pen core is arranged in the eighth through hole, and the eighth through hole and the third groove are coaxially connected.

[0015] In some embodiments, the linear bearing is composed of a second body and a third boss, the second body is a cuboid symmetric structure, the third boss is located at the upper end surface of the second body; the second body is symmetrically provided with four cylindrical first through holes, the screws are arranged in the first through holes; the third boss is a cylindrical symmetric structure, an axis part of the third boss is provided with a cylindrical second through hole, the first boss of the first support is arranged in the second through hole, the second through hole also penetrates the second body, and 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 standard parts.

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

[0018] 1) The steel pipe outer surface circumferential four equal division line marking device provided by the utility model comprises a first support, eight second supports, a third support, four fourth supports, four fifth supports, eight linear bearings, four pen cores, sixty-four screws, eight rolling bearings and four springs, since the material is common and is convenient to process into a shape, therefore, the manufacturing cost of the utility model device is relatively low.

[0019] 2) When the utility model is used, the four fourth supports are all in a folded setting at the beginning, the steel pipe is vertically arranged on the first body of the first support, the four second bosses are all arranged outside the steel pipe, ①, ②, ③ and ④ are simultaneously positively rotated and swung by 90 degrees, then the four fourth supports in four directions all become horizontally arranged, the eight linear bearings are uniformly moved upwards along the four first bosses of the first support, so that the four fourth supports can be uniformly vertically moved upwards, the four fourth supports cannot be rotated and swung, and the four pen cores can simultaneously perform four equal division longitudinal line marking in the circumferential direction of the outer surface of the steel pipe, therefore, the operation of the utility model device is relatively simple.

[0020] 3) The utility model is designed based on a symmetric structure, the use of the screw can realize linkage of the third support and the linear bearing, the combined use of the linear bearing and the first support can realize vertical lifting of the third support, the combined use of the third support and the screw can realize relative arrangement of the eight second supports, and then realize relative arrangement of the four fourth supports, the combined use of the second support and the rolling bearing can realize positioning and swinging of the fourth support, the combined use of the fourth support and the fifth support can realize positioning of the pen core, and the use of the spring can realize equal division line marking of the pen core in the front, rear, left and right four directions of the outer surface of the steel pipe, therefore, the use effect of the utility model device is relatively good.

[0021] The steel pipe outer surface circumferential four-equal-division marking device can realize four-equal-division longitudinal marking in the circumferential direction of the steel pipe outer surface, and has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a main view structural schematic diagram of the steel pipe outer surface circumferential four-equal-division marking device when the fourth support is in the folded state;

[0023] Figure 2 It is a plan view structural schematic diagram of the steel pipe outer surface circumferential four-equal-division marking device when the fourth support is in the folded state;

[0024] Figure 3 It is a main view structural schematic diagram of the steel pipe outer surface circumferential four-equal-division marking device when the fourth support is in the stretched state;

[0025] Figure 4 It is a plan view structural schematic diagram of the steel pipe outer surface circumferential four-equal-division marking device when the fourth support is in the stretched state;

[0026] Figure 5 It is a main view structural schematic diagram of the mutual position relation among the fifth support, the pen core, the spring and the fourth support of the steel pipe outer surface circumferential four-equal-division marking device;

[0027] Figure 6 It is a main view structural schematic diagram of the first support of the steel pipe outer surface circumferential four-equal-division marking device;

[0028] Figure 7 It is a plan view structural schematic diagram of the first support of the steel pipe outer surface circumferential four-equal-division marking device;

[0029] Figure 8 It is a main view structural schematic diagram of the linear bearing of the steel pipe outer surface circumferential four-equal-division marking device;

[0030] Figure 9 It is a plan view structural schematic diagram of the linear bearing of the steel pipe outer surface circumferential four-equal-division marking device;

[0031] Figure 10 It is a main view structural schematic diagram of the second support of the steel pipe outer surface circumferential four-equal-division marking device;

[0032] Figure 11 It is a plan view structural schematic diagram of the second support of the steel pipe outer surface circumferential four-equal-division marking device;

[0033] Figure 12 It is a main view structural schematic diagram of the third support of the steel pipe outer surface circumferential four-equal-division marking device;

[0034] Figure 13 It is a plan view structural schematic diagram of the third support of the steel pipe outer surface circumferential four-equal-division marking device;

[0035] Figure 14 It is a fourth support's main view structural schematic diagram of the utility model;

[0036] Figure 15 It is a fourth support's plan view structural schematic diagram of the utility model;

[0037] Figure 16 It is a fourth support's section view structural schematic diagram along M-M of the utility model;

[0038] Figure 17 It is a fifth support's main view structural schematic diagram of the utility model;

[0039] Figure 18 It is a fifth support's plan view structural schematic diagram of the utility model;

[0040] Figure 19 It is a fifth support's bottom view structural schematic diagram of the utility model;

[0041] Figure 20 It is a fifth support's section view structural schematic diagram along N-N of the utility model;

[0042] Figure 21 It is a fourth support's observation direction's schematic diagram of the utility model;

[0043] Figure 22 It is a fourth support's positive direction rotation swing's schematic diagram of the utility model;

[0044] Figure 23 It is a fourth support's reverse rotation swing's schematic diagram of the utility model;

[0045] Figure 24 It is a steel pipe outer surface circumference four equal division's marking device's working principle schematic diagram of the utility model.

[0046] Explanation of reference signs: 1-first support; 101-first body; 102-first boss; 103-second boss; 2-linear bearing; 201-second body; 202-third boss; 203-first through hole; 204-second through hole; 3-second support; 301-third body; 302-fourth boss; 303-first recess; 304-third through hole; 305-fourth through hole; 306-first screw hole; 307-second screw hole; 4-third support; 401-fourth body; 402-fifth boss; 403-sixth boss; 404-fifth through hole; 405-sixth through hole; 406-first screw hole; 407-second screw hole; 5-fourth support; 501-fifth body; 502-seventh boss; 503-bearing segment; 504-second recess; 505-seventh through hole; 6-fifth support; 601-sixth body; 602-eighth boss; 603-third recess; 604-eighth through hole; 7-lead; 8-screw; 9-rolling bearing; 10-spring; 11-steel pipe. DETAILED DESCRIPTION

[0047] The content of the utility model is explained in detail below through examples and drawings, and the examples are only used for understanding the utility model, and do not limit the content of the utility model.

[0048] Combination Figures 1 to 5 As shown in the drawings, the utility model provides a kind of steel pipe outer surface circumferential four equal division's marking device, it includes one first support 1, eight second supports 3, a third support 4, four fourth supports 5, four fifth supports 6, eight linear bearings 2, four leads 7, sixty-four screws 8, eight rolling bearings 9 and four springs 10;Wherein, the eight end faces of the eight sixth bosses 403 of the third support 4 are provided with the eight fourth bosses 302 of the eight second supports 3 opposite in pairs, and are connected by thirty-two screws 8;The eight first recesses 303 of the eight second supports 3 are provided with eight rolling bearings 9, and the eight rolling bearings 9 are provided with the eight bearing segments 503 of four fourth supports 5 opposite in pairs inside;The four second recesses 504 and four seventh through holes 505 of four fourth supports 5 are provided with a part of four leads 7 and four springs 10 inside, another part of four leads 7 is provided in four fifth supports 6 four third recesses 603 and four eighth through holes 604, and four fifth supports 6 and four fourth supports 5 are connected by internal thread and external thread;The eight third bosses 202 of eight linear bearings 2 opposite in pairs are provided in the four sixth through holes 405 of the third support 4, and are connected by thirty-two screws 8, and the four first bosses 102 of the first support 1 are provided in the eight second through holes 204 of the eight linear bearings 2.

[0049] The assembling process of the steel pipe outer surface circumferential four-equal-part line marking device is provided

[0050] Combining Figures 1 to 20 As shown in the figure, first, eight rolling bearings 9 are installed in eight first grooves 303 of eight second supports 3, then the eight second supports 3 are arranged opposite to each other, then eight bearing segments 503 of four fourth supports 5 are respectively threaded in the eight rolling bearings 9, so that the eight second supports 3, the eight rolling bearings 9 and the four fourth supports 5 can be assembled;

[0051] Then, one third support 4 is horizontally arranged, and eight sixth bosses 403 are arranged upwards at the same time, then eight fourth bosses 302 of the eight second supports 3 are respectively sleeved outside eight end faces of the eight sixth bosses 403 of the third support 4, thirty-two fourth through holes 305 of the eight second supports 3 and thirty-two second screw holes 407 of the third support 4 are centered, then thirty-two screws 8 are threaded through thirty-two fourth through holes 305 and screwed into thirty-two second screw holes 407, so that the eight second supports 3 and the third support 4 can be assembled;

[0052] Then, four springs 10 and a part of four pen cores 7 are threaded in four second grooves 504 and four seventh through holes 505 of the four fourth supports 5 in sequence, then another part of the four pen cores 7 is threaded in four third grooves 603 and four eighth through holes 604 of the four fifth supports 6, 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 can be assembled;

[0053] Then, eight third bosses 202 of the eight linear bearings 2 are threaded in four sixth through holes 405 of the third support 4 in pairs and respectively, thirty-two first through holes 203 of the eight linear bearings 2 and thirty-two first screw holes 406 of the third support 4 are centered, then thirty-two screws 8 are threaded through thirty-two first through holes 203 and screwed into thirty-two first screw holes 406, so that the eight linear bearings 2 and the third support 4 can be assembled;

[0054] Then, the first bracket 1 is set horizontally, ensuring that the four second protrusions 103 are simultaneously facing upwards. Finally, the four first protrusions 102 of the first bracket 1 are respectively inserted into the eight second through holes 204 of the eight linear bearings 2. In this way, the entire device is assembled and can be put into use.

[0055] The definition rules for the swing direction of the fourth support of the marking device for dividing the outer surface of a steel pipe into four equal parts circumferentially, provided by this utility model.

[0056] like Figure 4 As shown in the top view of the device of this utility model, for ease of description, the direction in which the fifth support 6 is located on the right side can be taken as the viewing direction, which is simplified as follows: Figure 21 As shown, there are four observation directions in total. Let's define the four observation directions as ①, ②, ③ and ④ respectively. Among them, the eight bearing segments 503 of the four fourth supports 5 are all swing shafts.

[0057] Assuming that initially all four fourth supports 5 are folded, i.e., all four fourth supports 5 are facing upwards, then the four pen refills 7 cannot draw lines. (Simplified version follows...) Figure 22 As shown, if ①, ②, ③ and ④ simultaneously rotate 90 degrees clockwise, then all four fourth supports 5 will be horizontally positioned. We can define this rotation direction of the four fourth supports 5 as positive.

[0058] Assuming that initially all four fourth supports 5 are in an extended position, i.e., all four fourth supports 5 are in a horizontal position, then the four pen refills 7 can draw lines. (Simplified version follows...) Figure 23 As shown, if ①, ②, ③ and ④ simultaneously rotate 90 degrees counterclockwise, then all four fourth supports 5 will be facing upwards. We can define this rotation direction of the four fourth supports 5 as reverse.

[0059] The working principle of the marking device for dividing the outer surface of a steel pipe into four equal parts circumferentially provided by this utility model

[0060] like Figure 4 As shown in the top view of the device of this utility model, for ease of description, the four longitudinal straight lines drawn by the four pen refills 7 are defined as points A, B, C and D, respectively; the four side edges of the fourth body 401 of the third bracket 4 are defined as points E, F, G and H, respectively; the axis of the steel pipe 11 is defined as point O; connect point O and point A and extend the line segment EF to intersect at point I; connect point O and point B and extend the line segment FG to intersect at point J; connect point O and point C and extend the line segment GH to intersect at point K; connect point O and point D and extend the line segment HE to intersect at point L;

[0061] According to the knowledge point that the internal angle sum of a plane quadrilateral is 360°, in the quadrilateral OIEL, ∠OIE+∠IEL+∠ELO+∠LOI=360°; Since the utility model adopts a symmetrical structure, therefore, the segment OI is perpendicular and bisects the segment EF, the segment OJ is perpendicular and bisects the segment FG, the segment OK is perpendicular and bisects the segment GH, and the segment OL is perpendicular and bisects the segment HE, that is, ∠OIE=∠ELO=90°; Since the fourth body 401 of the third support 4 is a cuboid, according to the knowledge point that the internal angle sum of a plane quadrilateral is 360°, in the square EFGH, the four internal angles are equal, therefore, ∠IEL=90°, and it can be deduced that ∠LOI=90°;

[0062] The same method can be used to deduce that ∠IOJ=∠JOK=∠KOL=90°, since ∠AOB=∠IOJ=90°, ∠BOC=∠JOK=90°, ∠COD=∠KOL=90°, and ∠DOA=∠LOI=90°, therefore, it can be deduced that ∠AOB=∠BOC=∠COD=∠DOA; According to the knowledge point that the arc length corresponding to an equal central angle in the same circle is also equal, arc AB=arc BC=arc CD=arc DA, that is, points A, B, C and D divide the entire outer 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 lines in the circumferential direction of the outer surface of the steel pipe 11.

[0063] The use method of the line marking device for the circumferential four-equal-division of the outer surface of the steel pipe

[0064] Step one: combination Figure 1 As shown in the figure, initially, the four fourth supports 5 are in a folded setting, first, the steel pipe 11 is vertically arranged 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 steel pipe 11 is arranged in the fifth through hole 404 of the third support 4;

[0065] Step two: combination Figure 22 As shown in the figure, then simultaneously rotate the ①, the ②, the ③ and the ④ by 90 degrees, then the four fourth supports 5 in the four directions are changed to horizontal setting, so as to facilitate the four pen cores 7 to perform line marking;

[0066] Step three: then move the eight linear bearings 2 at a uniform speed along the four first bosses 102 of the first support 1, so that the four fourth supports 5 can move vertically upward at a uniform speed, during which the four fourth supports 5 cannot be rotated, and the four pen cores 7 can simultaneously perform equal division longitudinal line marking in the front, rear, left and right four directions of the outer surface of the steel pipe 11, as shown in the figure Figure 4The steel pipe is shown.

[0067] Supplementary explanation: the steel pipe outer surface circumferential four equal division's marking device provided by the utility model adopts symmetrical structure to design, first should according to the outer diameter specification of steel pipe and the fixed length of steel pipe, design and manufacture multiple specifications of the utility model device matched with it;Should pre-compress slightly to the spring, that is, pre-apply a compression force to the spring, so as to ensure that the pen core can contact the outer surface of the steel pipe by elastic force and make four equal division longitudinal marking in the circumferential direction.

[0068] Through the embodiment, it can be seen that the steel pipe outer surface circumferential four equal division's marking device provided by the utility model can achieve the purpose of four equal division longitudinal marking in the circumferential direction of the outer surface of the steel pipe, and the utility model device has the characteristics of low manufacturing cost, simple operation and good use effect.

[0069] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and is not used for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent replacement to part of the technical features.

Claims

1. A marking device for the outer surface of a steel pipe, which is divided into four equal parts in the circumferential direction, characterized in that, The steel pipe outer surface four equal division of the marking device includes: a first support (1), eight second support (3), a third support (4), four fourth support (5), four fifth support (6), eight linear bearings (2), four pen core (7), sixty-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 rectangular parallelepiped symmetric structure, four first bosses (102) are oppositely arranged, and are located on the upper end face of the first body (101), four second bosses (103) are oppositely arranged, and are located on the upper end face of the first body (101); the first boss (102) is a cylindrical symmetric structure, used for penetrating the second 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 a third body (301) and a fourth boss (302), the third body (301) and the fourth boss (302) are both rectangular parallelepiped symmetric structures, and the fourth boss (302) is located on the left end face of the third body (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 third 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 third through hole (304); four cylindrical fourth through holes (305) are symmetrically formed in the fourth boss (302), and the screws (8) are penetrated in the fourth through holes (305); The third support (4) is connected by a fourth body (401), eight fifth bosses (402) and eight sixth bosses (403), the fourth body (401), the fifth boss (402) and the sixth boss (403) are all cuboid symmetrical structures, eight fifth bosses (402) are oppositely arranged in pairs and are located on the upper and lower end faces of the fourth body (401), and eight sixth bosses (403) are oppositely arranged in pairs and are located on the upper end face of the fourth body (401); a cuboid-shaped fifth through hole (404) is formed in the middle part of the fourth body (401), and a steel pipe is arranged in the fifth through hole (404); a cylindrical sixth through hole (405) is formed in the middle part of the fifth boss (402), a third boss (202) of the linear bearing (2) is arranged in the sixth through hole (405), and the sixth through hole (405) penetrates the fourth body (401); four first screw holes (406) are uniformly formed around the sixth through hole (405), and the first screw hole (406) is screwed with the screw (8); the sixth boss (403) is symmetrically provided with four second screw holes (407), and the second screw hole (407) is screwed with the screw (8); 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 symmetrical structure, the seventh boss (502) is located on the upper end face of the fifth body (501), and the two bearing segments (503) are oppositely arranged and located on the left and right end faces of the fifth body (501); the seventh boss (502) is a cylindrical symmetrical structure, a cylindrical seventh through hole (505) is formed in the axial part of the seventh boss (502), and the pen core (7) is arranged in the seventh 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 cylindrical second groove (504) is formed in the central part of the upper end face of the fifth body (501), the spring (10) and the pen core (7) are arranged in the second groove (504), and the second groove (504) and the seventh through hole (505) are coaxially connected; the bearing segment (503) is a cylindrical symmetrical 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 on the upper end surface of the sixth body (601); a cylindrical third groove (603) is arranged on the axis of the lower end surface of the sixth body (601), the pen core (7) is arranged in the third groove (603), the end of the sixth body (601) is provided with internal threads for screwing the external threads of the fourth support (5); an eighth through hole (604) is arranged on the axis of the eighth boss (602), the pen core (7) is arranged in the eighth through hole (604), and the eighth through hole (604) is coaxially connected with the third groove (603).

2. The apparatus according to claim 1, wherein The linear bearing (2) is composed of a second body (201) and a third boss (202), the second body (201) is a rectangular parallelepiped symmetrical structure, and the third boss (202) is located on the upper end surface of the second body (201); the second body (201) is symmetrically provided with four cylindrical first through holes (203), and the first through holes (203) are arranged in the screws (8); the third boss (202) is a cylindrical symmetrical structure, an axis of the third boss (202) is provided with a cylindrical second through hole (204), the first boss (102) of the first support (1) is arranged in the second through hole (204), the second through hole (204) also penetrates the second body (201), and the third boss (202) is further provided with a retainer, balls and a retainer ring.

3. The apparatus according to claim 1, wherein The pen core (7), the screw (8), the rolling bearing (9) and the spring (10) are all standard parts.

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