Device for transversely scribing inner wall of circular steel pipe

Abstract

The utility model discloses a device for transversely scribing the inner wall of a round steel pipe, and belongs to the technical field of auxiliary scribing equipment for steel pipe machining. The device for transversely scribing the inner wall of the round steel pipe comprises a first support, a second support, two third supports, two fourth supports, two fifth supports, a sixth support, a cushion block, a rotating shaft, two refills, eight first screws, eight second screws and four first rolling bearings. The device can achieve the purpose of conducting transverse scribing in the circumferential direction of the inner wall of the round 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 device for transversely marking the inner wall of a circular steel pipe. BACKGROUND

[0002] At present, compared with other section profiles, the circular steel pipe has relatively high resistance to bending and resistance to torsion, and therefore, the circular steel pipe has been widely used in the field of mechanical manufacturing and the field of structural engineering; sometimes, the inner wall of the circular steel pipe needs to be transversely marked as a reference mark so as to process a groove, calibrate an installation position or measure an internal dimension on the inner wall, but there are relatively few professional devices for transversely marking the inner wall of the circular steel pipe, and usually, enterprises adopt a right-angle caliper to transversely mark the inner wall of the circular steel pipe, but the marking precision and marking efficiency of this way are relatively limited.

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

[0004] The patent document CN202020692698.9 discloses a marking device for cutting a steel pipe, which mainly comprises a marking ring, a stand, a connecting plate, a screw rod, a positioning block, a bottom plate, a lifting plate, a conical block, a sliding block, a marking box, a connecting rod, a placing frame, a limiting block, a bearing, a moving block, a fixing block, a roller, a spring, an extension rod, a push block, a rotating shaft and a rotating handle, the device has a clever design, the adjustable marking function realizes marking operation by a single person, mechanical marking can improve marking precision and marking efficiency, but the device is only suitable for marking the outer wall of the steel pipe and is not suitable for marking the inner wall of the steel pipe.

[0005] The patent document CN202022153824.6 discloses a longitudinal median line marking device for a steel pipe, which mainly comprises a fixing frame, a sliding block, an adjusting screw rod, a shaft sleeve, a rotating arm, a marking pen, a guide rod, a rotating roller and a fixing stake, the device has a clever design, the adjusting screw rod can adjust the distance between the rotating rollers to adapt to steel pipes with different diameters and can lock the position of the sliding block, the two rotating arms can always form an isosceles triangle, thereby the longitudinal median line of the steel pipe can be marked, and the marking precision and marking efficiency can be improved, but the device is only suitable for marking the outer wall of the steel pipe and is not suitable for marking the inner wall of the steel pipe.

[0006] The patent document CN202322620015.5 discloses a marking device for assisting steel pipe processing, which mainly comprises a mounting base frame, a mounting frame, a supporting plate, a supporting roller, a rotating drum, a screw rod, a mounting sleeve, a spring, a marking pen, a clamping platform and an auxiliary handle. The device has a clever design, the screw rod can adjust the height of the marking pen in the rotating drum to adapt to steel pipes with different diameters, the mounting sleeve can fine-tune the position of the marking pen, and rotating the rotating drum can drive the marking pen to rotate around the steel pipe for one circle to complete marking, and the marking quality is relatively good. However, the device is only suitable for marking the outer wall of the steel pipe and is not suitable for marking the inner wall of the 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 device for marking the inner wall of a circular steel pipe in a transverse direction, which is designed based on a symmetrical structure. The combined use of the cushion block and the second screw rod can realize the relative arrangement of the first support and the second support. The combined use of the first support, the second support and the second rolling bearing can realize the positioning and rotation of the rotating shaft. The combined use of the sixth support and the first screw rod can realize the relative arrangement of the two fourth supports and the linkage of the fourth support and the rotating shaft. The combined use of the fourth support and the first rolling bearing can realize the positioning and swinging of the fifth support. The combined use of the third support and the fifth support can realize the positioning of the pen core. The use of the spring can realize the transverse marking of the pen core in the circumferential direction of the inner wall of the circular steel pipe. Therefore, the use effect of the device is relatively good.

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

[0009] The device for marking the inner wall of a circular steel pipe in a transverse direction comprises a first support, a second support, two third supports, two fourth supports, two fifth supports, a sixth support, a cushion block, a rotating shaft, two pen cores, eight first screw rods, eight second screw rods, four first rolling bearings, two second rolling bearings and two springs.

[0010] The first support is connected by a first body, a first boss, a second boss and four third bosses, the first body is a cuboid symmetric structure, the first boss, the second boss and the third boss are all cylindrical symmetric structure, the first boss is located on the upper end surface of the first body, the second boss is located on the upper end surface of the first boss, and the four third bosses are arranged oppositely and located on the upper end surface of the first body; the axis part of the second boss is provided with a cylindrical first through hole, and the second rolling bearing is arranged in the first through hole; the second boss is uniformly provided with four cylindrical second through holes in the circumferential direction, and the second screw is arranged in the second through hole; the axis part of the upper end surface of the first boss is provided with a cylindrical first recess, and the first bearing segment of the rotating shaft is arranged in the first recess; the first recess and the first through hole are coaxially connected, the inner diameter of the first recess should be smaller than the inner diameter of the first through hole, but should be larger than the diameter of the first bearing segment of the rotating shaft;

[0011] The second support is connected by a second body and a fourth boss, the second body and the fourth boss are both cylindrical symmetric structure, the fourth boss is located on the upper end surface of the second body; the axis part of the second body is provided with a cylindrical fourth through hole, and the second rolling bearing is arranged in the fourth through hole; the second body is uniformly provided with four cylindrical fifth through holes in the circumferential direction, and the second screw is arranged in the fifth through hole; the axis part of the fourth boss is provided with a cylindrical sixth through hole, and the second bearing segment of the rotating shaft is arranged in the sixth through hole; the sixth through hole and the fourth through hole are coaxially connected, the inner diameter of the sixth through hole should be smaller than the inner diameter of the fourth through hole, but should be larger than the diameter of the second bearing segment of the rotating shaft;

[0012] The third support is connected by a coaxial third body and a fifth boss, the third body and the fifth boss are both cylindrical symmetric structure, the fifth boss is located on the upper end surface of the third body; the axis part of the lower end surface of the third body is provided with a cylindrical second recess, and the pen core is arranged in the second recess, and the end part of the third body is provided with internal threads for screwing the external threads of the fifth support; the axis part of the fifth boss is provided with a cylindrical seventh through hole, and the pen core is arranged in the seventh through hole, and the seventh through hole and the second recess are coaxially connected;

[0013] The fourth support is connected by two fourth bodies and a sixth boss, the fourth body and the sixth boss are both cuboid symmetric structures, the two fourth bodies are oppositely arranged, and the sixth boss is located between the two fourth bodies; a cylindrical third groove is arranged at the middle part of the rear end face of the fourth body, and the first rolling bearing is arranged in the third groove; an eighth through hole in the shape of a cylinder is arranged at the axis part of the third groove, and the third bearing segment of the fifth support is arranged in the eighth through hole; four ninth through holes in the shape of a cylinder are symmetrically arranged in the sixth boss, and the first screw is arranged in the ninth through hole;

[0014] The fifth support is connected by a fifth body, a seventh boss and two third bearing segments, the fifth body is a cuboid symmetric structure, the seventh boss is located at the upper end face of the fifth body, and the two third bearing segments are oppositely arranged and respectively located at the front and rear end faces of the fifth body; the seventh boss is a cylindrical symmetric structure, a tenth 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 tenth through hole; the end part of the seventh boss is provided with external threads for screwing the internal threads of the third support; a fourth 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 fourth groove, and the fourth groove and the tenth through hole are coaxially connected; the third bearing segment is a cylindrical symmetric structure for arranging the first rolling bearing;

[0015] The sixth support is connected by two sixth bodies and an eighth boss, the sixth body and the eighth boss are both cuboid symmetric structures, the two sixth bodies are oppositely arranged, and the eighth boss is located between the two sixth bodies; four second screw holes are symmetrically arranged in the sixth body, and the first screw is screwed in the second screw hole; a eleventh through hole in the shape of a regular octagon is arranged at the middle part of the eighth boss, and the clamping segment of the rotating shaft is arranged in the eleventh through hole.

[0016] In some embodiments, the cushion block is a cylindrical symmetric structure, a third through hole in the shape of a cylinder is arranged at the axis part of the cushion block, and the isolation segment of the rotating shaft is arranged in the third through hole; four first screw holes are uniformly arranged in the circumferential direction of the cushion block, and the second screw is screwed in the first screw hole.

[0017] In some embodiments, the rotating shaft is connected by coaxial first bearing segment, isolation segment, second bearing segment and clamping segment, the first bearing segment, the isolation segment and the second bearing segment are all cylindrical symmetric structure, the second bearing segment and the first bearing segment are oppositely arranged and respectively located at the upper and lower end faces of the isolation segment, and the clamping segment is located at the upper end face of the second bearing segment; the clamping segment is a regular octahedron symmetric structure for penetrating the eleventh through hole of the sixth support; the first bearing segment and the second bearing segment are both used for penetrating the second rolling bearing, the diameters of the first bearing segment and the second bearing segment are equal and should be smaller than the diameter of the isolation segment but larger than the diameter of the circumscribed circle of the clamping segment.

[0018] In some embodiments, the pen core, the first screw, the second screw, the first rolling bearing, the second rolling bearing and the spring are all standard parts.

[0019] The utility model discloses the beneficial effects are as follows:

[0020] 1) the device that the utility model provides to the inner wall of circular steel pipe carries out transverse scribe includes a first support, a second support, two third supports, two fourth supports, two fifth supports, a sixth support, a cushion block, a rotating shaft, two pen cores, eight first screws, eight second screws, four first rolling bearings, two second rolling bearings and two springs, because ordinary material, and convenient processing into shape, therefore, the manufacturing cost of the device of the utility model is relatively lower.

[0021] 2) the utility model uses, two fifth supports are all in the folded setting at the beginning, and the circular steel pipe is set up on the first body of the first support, and four third bosses are all penetrated outside the circular steel pipe, and the third support, the fourth support and the fifth support are all penetrated in the circular steel pipe;With ① and ② are simultaneously positive rotation swing 90 degrees, then the two fifth supports on the left and right sides all become horizontal setting, to facilitate two pen cores to scribe; Along the horizontal direction, the sixth support is rotated at a constant speed 180 degrees, and the two fifth supports can not be rotated along the third bearing segment, and two pen cores can be transversely scribed on the circumferential direction of the inner wall of the circular steel pipe, therefore, the operation of the device of the utility model is relatively simple.

[0022] 3)The utility model discloses based on symmetrical structure designs, and the joint use of cushion block and second screw can realize the relative setting of first support and second support, and the joint use of first support, second support and second rolling bearing can realize the positioning rotation of pivot, and the joint use of sixth support and first screw can realize the relative setting of two fourth supports and linkage of fourth support and pivot, and the joint use of fourth support and first rolling bearing can realize the positioning swing of fifth support, and the joint use of third support and fifth support can realize the positioning of refill, and the use of spring can realize the transverse marking of refill in the circumferential direction of the inner wall of circular steel pipe, and therefore, the use effect of the utility model device is relatively better.

[0023] The device for marking the inner wall of the circular steel pipe in the transverse direction can realize the purpose of marking in the transverse direction in the circumferential direction of the inner wall of the circular steel pipe, and the device has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the front view structural schematic drawing of the device for marking the inner wall of the circular steel pipe in the transverse direction of the utility model when fifth support is in the folded state.

[0025] Figure 2 It is the left view structural schematic drawing of the device for marking the inner wall of the circular steel pipe in the transverse direction of the utility model when fifth support is in the folded state.

[0026] Figure 3 It is the front view structural schematic drawing of the device for marking the inner wall of the circular steel pipe in the transverse direction of the utility model when fifth support is in the stretched state.

[0027] Figure 4 It is the top view structural schematic drawing of the device for marking the inner wall of the circular steel pipe in the transverse direction of the utility model when the circular steel pipe is set up vertically.

[0028] Figure 5 It is the top view structural schematic drawing of the device for marking the inner wall of the circular steel pipe in the transverse direction of the utility model when marking the inner wall of the circular steel pipe.

[0029] Figure 6 It is the front view structural schematic drawing of the mutual position relation between third support, refill, spring and fifth support of the utility model.

[0030] Figure 7 It is the front view structural schematic drawing of first support of the utility model.

[0031] Figure 8 It is the top view structural schematic drawing of first support of the utility model.

[0032] Figure 9 It is the first support of the utility model along the section structure schematic view of M-M surface;

[0033] Figure 10 It is the overhead structure schematic view of the cushion block of the utility model;

[0034] Figure 11 It is the front view structure schematic view of the second support of the utility model;

[0035] Figure 12 It is the overhead structure schematic view of the second support of the utility model;

[0036] Figure 13 It is the bottom view structure schematic view of the second support of the utility model;

[0037] Figure 14 It is the section structure schematic view of the second support along N-N surface of the utility model;

[0038] Figure 15 It is the front view structure schematic view of the pivot of the utility model;

[0039] Figure 16 It is the front view structure schematic view of the third support of the utility model;

[0040] Figure 17 It is the overhead structure schematic view of the third support of the utility model;

[0041] Figure 18 It is the bottom view structure schematic view of the third support of the utility model;

[0042] Figure 19 It is the section structure schematic view of the third support along P-P surface of the utility model;

[0043] Figure 20 It is the front view structure schematic view of the fourth support and a first rolling bearing assembly of the utility model after;

[0044] Figure 21 It is the overhead structure schematic view of the fourth support of the utility model;

[0045] Figure 22 It is the left view structure schematic view of the fifth support of the utility model;

[0046] Figure 23 It is the overhead structure schematic view of the fifth support of the utility model;

[0047] Figure 24 It is the section structure schematic view of the fifth support along Q-Q surface of the utility model;

[0048] Figure 25The utility model discloses a sixth support's main view structure schematic diagram;

[0049] Figure 26 The utility model discloses a sixth support's plan view structure schematic diagram;

[0050] Figure 27 The utility model discloses a fifth support's positive rotation swing's schematic diagram;

[0051] Figure 28 The utility model discloses a fifth support's reverse rotation swing's schematic diagram.

[0052] Mark explanation: 1 - first support;101 - first body;102 - first boss;103 - second boss;104 - third boss;105 - first recess;106 - first through hole;107 - second through hole;2 - cushion block;201 - third through hole;202 - first screw hole;3 - second support;301 - second body;302 - fourth boss;303 - fourth through hole;304 - fifth through hole;305 - sixth through hole;4 - rotating shaft;401 - first bearing section;402 - second bearing section;403 - isolation section;404 - detent section;5 - third support;501 - third body;502 - fifth boss;503 - second recess;504 - seventh through hole;6 - fourth support;601 - fourth body;602 - sixth boss;603 - third recess;604 - eighth through hole;605 - ninth through hole;7 - fifth support;701 - fifth body;702 - seventh boss;703 - third bearing section;704 - fourth recess;705 - tenth through hole;8 - sixth support;801 - sixth body;802 - eighth boss;803 - second screw hole;804 - eleventh through hole;9 - refill;10 - first screw;11 - second screw;12 - first rolling bearing;13 - second rolling bearing;14 - spring;15 - round steel pipe. DETAILED DESCRIPTION

[0053] The following through the embodiment and the attached drawing detailed explanation the content of the utility model, and the embodiment is only for understanding the utility model, and not in the limitation of the content of the utility model.

[0054] Combination Figures 1 to 6As shown in the device, the device for transversely marking the inner wall of the circular steel pipe comprises a first support 1, a second support 3, two third supports 5, two fourth supports 6, two fifth supports 7, a sixth support 8, a cushion block 2, a rotating shaft 4, two pen cores 9, eight first screws 10, eight second screws 11, four first rolling bearings 12, two second rolling bearings 13 and two springs 14; wherein one first through hole 106 of the first support 1 is provided with one second rolling bearing 13, and the first bearing segment 401 of the rotating shaft 4 is arranged in the second rolling bearing 13; the second bearing segment 402 of the rotating shaft 4 is arranged in another second rolling bearing 13, and the other second rolling bearing 13 is arranged in a fourth through hole 303 of the second support 3; the second boss 103 of the first support 1 and the second body 301 of the second support 3 are provided with the cushion block 2 and are connected by eight second screws 11; the isolation segment 403 of the rotating shaft 4 is arranged in the third through hole 201 of the cushion block 2, and the clamping segment 404 of the rotating shaft 4 is arranged in an eleventh through hole 804 of the sixth support 8; the front and rear end faces of the two sixth bodies 801 of the sixth support 8 are provided with the two sixth bosses 602 of the two fourth supports 6, and are connected by eight first screws 10; the four third recesses 603 of the two fourth supports 6 are provided with the four first rolling bearings 12, and the four third bearing segments 703 of the two fifth supports 7 are arranged in the four first rolling bearings 12; the two fourth recesses 704 and the two tenth through holes 705 of the two fifth supports 7 are provided with the two springs 14 and a part of the two pen cores 9, and the other part of the two pen cores 9 is arranged in the two second recesses 503 and the two seventh through holes 504 of the two third supports 5, and the two third supports 5 and the two fifth supports 7 are connected by internal threads and external threads.

[0055] The assembly process of the device for transversely marking the inner wall of the circular steel pipe is provided.

[0056] Combined Figures 1 to 26 As shown, first, the first support 1 is arranged horizontally, and the four third bosses 104 are arranged upwards, then a second rolling bearing 13 is arranged in a first through hole 106 of the first support 1, and then the first bearing segment 401 of the rotating shaft 4 is arranged in the second rolling bearing 13, so that the first support 1, the second rolling bearing 13 and the rotating shaft 4 are assembled.

[0057] Then a third through hole 201 of one of the pads 2 is sequentially threaded through the clamping section 404 and the second bearing section 402 of the rotating shaft 4 and is sleeved outside the isolation section 403, at this time, the pad 2 is arranged on the upper end surface of the second boss 103 of the first support 1, then the four first screw holes 202 of the pad 2 and the four second through holes 107 of the first support 1 are centered, then the four second screws 11 are threaded through the four second through holes 107 and are screwed into the four first screw holes 202, in this way, the pad 2 and the first support 1 can be assembled;

[0058] Then a fourth through hole 303 of one of the second supports 3 is arranged in one of the second rolling bearings 13, then the sixth through hole 305 of the second support 3 is sequentially threaded through the clamping section 404 and the second bearing section 402 of the rotating shaft 4 and the second bearing section 402 of the rotating shaft 4 is sleeved in the second rolling bearing 13, in this way, the second support 3, the second rolling bearing 13 and the rotating shaft 4 can be assembled;

[0059] At this time, the second body 301 of the second support 3 is arranged on the upper end surface of the pad 2, then the four fifth through holes 304 of the second support 3 and the four first screw holes 202 of the pad 2 are centered, then the four second screws 11 are threaded through the four fifth through holes 304 and are screwed into the four first screw holes 202, in this way, the second support 3 and the pad 2 can be assembled;

[0060] Then four first rolling bearings 12 are arranged in the four third recesses 603 of the two fourth supports 6, then the two fourth supports 6 are arranged oppositely, then the four third bearing sections 703 of the two fifth supports 7 are respectively sleeved in the four first rolling bearings 12, in this way, the two fourth supports 6, the four first rolling bearings 12 and the two fifth supports 7 can be assembled;

[0061] Then one of the sixth supports 8 is arranged horizontally, then the two sixth bosses 602 of the two fourth supports 6 are respectively sleeved on the front and rear end surfaces of the two sixth bodies 801 of the sixth support 8, and the eight ninth through holes 605 of the two fourth supports 6 and the eight second screw holes 803 of the sixth support 8 are centered, then the eight first screws 10 are threaded through the eight ninth through holes 605 and are screwed into the eight second screw holes 803, in this way, the two fourth supports 6 and the sixth support 8 can be assembled;

[0062] Then two said spring 14 and two said pen core 9 part are threaded in two fourth groove 704 and two tenth through hole 705 of two said fifth support 7, then two said pen core 9 other part is threaded in two second groove 503 and two seventh through hole 504 of two said third support 5, then two said third support 5 and two said fifth support 7 are screwed by internal thread and external thread, so that two said fifth support 7, two said spring 14, two said pen core 9 and two said third support 5 can be assembled;

[0063] Finally, the eleventh through hole 804 of the sixth support 8 is sleeved outside the clamping section 404 of the rotating shaft 4, so that the whole device is assembled and can be put into use.

[0064] The fifth support swing direction defining rule of the device for transversely marking the inner wall of the circular steel pipe

[0065] Combined with Figure 1 And Figure 3 As shown in the front view structural schematic diagram of the device, in order to facilitate description, two said fifth support 7 are defined as ① and ②, wherein the four third bearing sections 703 of two said fifth support 7 are all swing shafts;

[0066] Suppose that initially two said fifth support 7 are both in folded setting, that is, two said fifth support 7 are both in upward setting, at this time, two said pen core 9 cannot mark, and after simplification, as shown in Figure 27 The ① swings 90 degrees in the counterclockwise direction, and the ② swings 90 degrees in the clockwise direction, so that two said fifth support 7 are both in horizontal setting, and the swing direction of two said fifth support 7 is defined as forward direction;

[0067] Suppose that initially two said fifth support 7 are both in stretched setting, that is, two said fifth support 7 are both in horizontal setting, at this time, two said pen core 9 can mark, and after simplification, as shown in Figure 28 The ① swings 90 degrees in the clockwise direction, and the ② swings 90 degrees in the counterclockwise direction, so that two said fifth support 7 are both in upward setting, and the swing direction of two said fifth support 7 is defined as reverse direction.

[0068] The use method of the device for transversely marking the inner wall of the circular steel pipe

[0069] Step one: combined with Figure 1As shown, initially, the two fifth supports 7 are in the folded arrangement, the circular steel pipe 15 is first vertically arranged on the first body 101 of the first support 1, and the four third bosses 104 are all arranged outside the circular steel pipe 15, at this time, the third support 5, the fourth support 6 and the fifth support 7 are all arranged inside the circular steel pipe 15;

[0070] Step two: combination Figure 1 and Figure 27 As shown, then the ① and the ② are simultaneously forwardly rotated and swung by 90 degrees, the two fifth supports 7 located on the left and right sides are all changed into the horizontal arrangement, so as to facilitate the two pen cores 9 to draw lines;

[0071] Step three: then the sixth support 8 is uniformly rotated by 180 degrees along the horizontal direction, during which the two fifth supports 7 cannot be rotated and swung along the third bearing segment 703, the two pen cores 9 can draw lines in the circumferential direction of the inner wall of the circular steel pipe 15, as shown in Figure 5 .

[0072] Supplementary explanation: the device for drawing lines in the circumferential direction of the inner wall of the circular steel pipe provided by the utility model adopts the symmetrical structure, firstly, a plurality of specifications of the device should be designed and manufactured according to the outer diameter specification of the circular steel pipe, the wall thickness specification of the circular steel pipe and the line drawing position of the circular steel pipe; since the spring has the self-balancing function, 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 circular steel pipe and draw lines in the circumferential direction by the elastic force.

[0073] As can be seen from the embodiments, the device for drawing lines in the circumferential direction of the inner wall of the circular steel pipe provided by the utility model can draw lines in the circumferential direction of the inner wall of the circular steel pipe, and the device has the characteristics of low manufacturing cost, simple operation and good use effect.

[0074] Finally, it should be pointed out that: the above-mentioned only for the preferred embodiments of the utility model, and does not limit 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 to part of the technical features.

Claims

1. An apparatus for transversely scribing the inner wall of a circular steel pipe, characterized by, The device that the inner wall of circular steel pipe is transversely ruled includes: a first support (1), a second support (3), two third supports (5), two fourth supports (6), two fifth supports (7), a sixth support (8), a cushion block (2), a pivot (4), two pen cores (9), eight first screws (10), eight second screws (11), four first rolling bearings (12), two second rolling bearings (13) and two springs (14), wherein: The first support (1) is connected by a first body (101), a first boss (102), a second boss (103) and four third bosses (104), the first body (101) is a cuboid symmetric structure, the first boss (102), the second boss (103) and the third boss (104) are all cylindrical symmetric structures, the first boss (102) is located at the upper end face of the first body (101), the second boss (103) is located at the upper end face of the first boss (102), and the four third bosses (104) are arranged opposite to each other and located at the upper end face of the first body (101); the axis part of the second boss (103) is provided with a cylindrical first through hole (106), the second rolling bearing (13) is arranged in the first through hole (106); the second boss (103) is uniformly provided with four cylindrical second through holes (107) in the circumferential direction, the second screw (11) is arranged in the second through hole (107); the axis part of the upper end face of the first boss (102) is provided with a cylindrical first recess (105), the first bearing section (401) of the pivot (4) is arranged in the first recess (105); the first recess (105) and the first through hole (106) are coaxially connected, the inner diameter of the first recess (105) should be smaller than the inner diameter of the first through hole (106), but should be greater than the diameter of the first bearing section (401) of the pivot (4); The second support (3) is composed of a second body (301) and a fourth boss (302), the second body (301) and the fourth boss (302) are both cylindrical symmetrical structures, the fourth boss (302) is located on the upper end surface of the second body (301); the axis part of the second body (301) is provided with a cylindrical fourth through hole (303), the second rolling bearing (13) is arranged in the fourth through hole (303); the second body (301) is uniformly provided with four cylindrical fifth through holes (304) in the circumferential direction, the second screw (11) is arranged in the fifth through hole (304); the axis part of the fourth boss (302) is provided with a cylindrical sixth through hole (305), the second bearing segment (402) of the rotating shaft (4) is arranged in the sixth through hole (305); the sixth through hole (305) and the fourth through hole (303) are coaxially connected, the inner diameter of the sixth through hole (305) should be smaller than the inner diameter of the fourth through hole (303) but should be larger than the diameter of the second bearing segment (402) of the rotating shaft (4); The third support (5) is composed of a coaxial third body (501) and a fifth boss (502), the third body (501) and the fifth boss (502) are both cylindrical symmetrical structures, the fifth boss (502) is located on the upper end surface of the third body (501); the axis part of the lower end surface of the third body (501) is provided with a cylindrical second groove (503), the pen core (9) is arranged in the second groove (503), the end part of the third body (501) is provided with internal threads, which are used for screwing the external threads of the fifth support (7); the axis part of the fifth boss (502) is provided with a cylindrical seventh through hole (504), the pen core (9) is arranged in the seventh through hole (504), the seventh through hole (504) and the second groove (503) are coaxially connected; The fourth support (6) is connected by two fourth bodies (601) and a sixth boss (602), the fourth body (601) and the sixth boss (602) are both cuboid symmetric structures, the two fourth bodies (601) are oppositely arranged, and the sixth boss (602) is located between the two fourth bodies (601); The middle part of the rear end face of the fourth body (601) is provided with a cylindrical third groove (603), and the first rolling bearing (12) is arranged in the third groove (603); The axis part of the third groove (603) is provided with a cylindrical eighth through hole (604), and the third bearing segment (703) of the fifth support (7) is arranged in the eighth through hole (604); The sixth boss (602) is symmetrically provided with four cylindrical ninth through holes (605), and the first screw (10) is arranged in the ninth through hole (605); The fifth support (7) is connected by a fifth body (701), a seventh boss (702) and two third bearing segments (703), the fifth body (701) is a cuboid symmetric structure, the seventh boss (702) is located at the upper end face of the fifth body (701), and the two third bearing segments (703) are oppositely arranged and respectively located at the front and rear end faces of the fifth body (701); The seventh boss (702) is a cylindrical symmetric structure, the axis part of the seventh boss (702) is provided with a cylindrical tenth through hole (705), and the pen core (9) is arranged in the tenth through hole (705); The end of the seventh boss (702) is provided with external threads for screwing the internal threads of the third support (5); The center part of the upper end face of the fifth body (701) is provided with a cylindrical fourth groove (704), and the spring (14) and the pen core (9) are arranged in the fourth groove (704), and the fourth groove (704) and the tenth through hole (705) are coaxially connected; The third bearing segment (703) is a cylindrical symmetric structure for arranging the first rolling bearing (12); The sixth support (8) is connected by two sixth bodies (801) and an eighth boss (802), the sixth body (801) and the eighth boss (802) are both cuboid symmetric structures, the two sixth bodies (801) are oppositely arranged, and the eighth boss (802) is located between the two sixth bodies (801); The sixth body (801) is symmetrically provided with four second screw holes (803), and the first screw (10) is screwed in the second screw hole (803); The middle part of the eighth boss (802) is provided with a regular octagonal eleventh through hole (804), and the clamping segment (404) of the rotating shaft (4) is arranged in the eleventh through hole (804).

2. The apparatus for transversely scoring the inner wall of a circular steel pipe according to claim 1, wherein The cushion block (2) is a cylindrical symmetric structure, an axis part of the cushion block (2) is provided with a cylindrical third through hole (201), the third through hole (201) is provided with the isolation section (403) of the rotating shaft (4); the cushion block (2) is uniformly provided with four first screw holes (202) in the circumferential direction, the first screw hole (202) is screwed with the second screw (11).

3. The apparatus for transversely scoring the inner wall of a circular steel pipe according to claim 1, wherein The rotating shaft (4) is composed of coaxial first bearing section (401), isolation section (403), second bearing section (402) and clamping section (404), the first bearing section (401), the isolation section (403) and the second bearing section (402) are all cylindrical symmetric structures, the second bearing section (402) and the first bearing section (401) are oppositely arranged and respectively located at the upper and lower end faces of the isolation section (403), the clamping section (404) is located at the upper end face of the second bearing section (402); the clamping section (404) is a regular octagonal symmetric structure, used for penetrating the eleventh through hole (804) of the sixth support (8); the first bearing section (401) and the second bearing section (402) are both used for penetrating the second rolling bearing (13), the diameters of the first bearing section (401) and the second bearing section (402) are equal, and should be smaller than the diameter of the isolation section (403) but should be larger than the diameter of the circumscribed circle of the clamping section (404).

4. The apparatus for transversely scoring the inner wall of a circular steel pipe according to claim 1, wherein The pen core (9), the first screw (10), the second screw (11), the first rolling bearing (12), the second rolling bearing (13) and the spring (14) are all standard parts.

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