CN217324770U

CN217324770U - Track beam

Info

Publication number: CN217324770U
Application number: CN202220937985.0U
Authority: CN
Inventors: 郑兴伟; 宋允晓; 韩志远; 韩雪峰; 吴亮; 刘红军; 刘滕
Original assignee: Youluoka Shandong Mining Industry Technology Co ltd
Current assignee: Youluoka Shandong Mining Industry Technology Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-08-30
Anticipated expiration: 2032-04-21

Abstract

The application discloses track roof beam, be used for single track system of hanging technical field, including the straight rail of first straight rail and second, be equipped with the straight rail in middle section between the two, the distance between the straight rail of first straight rail and second is greater than the width of the straight rail in middle section, between the straight rail in first straight rail and middle section and/or between the straight rail in second and the straight rail in middle section form the reservation gap that is used for absorbing track roof beam deformation, first straight rail, the upside and the downside of the straight rail in middle section and second all carry out movably connection through coupling mechanism, coupling mechanism include respectively with first straight rail, the straight rail in middle section and the straight rail fixed connection's in second connecting block and carry out movably connection's guide part with the connecting block. The track beam usually generates compression or tension deformation, a reserved gap is formed in the track beam, and the width of the reserved gap is reduced when the track beam generates compression deformation; when tensile deformation occurs, the width of the reserved gap is increased, so that the deformation is absorbed, the normal operation of the monorail crane is ensured, and the safety of the track beam is improved.

Description

Track beam

Technical Field

The application relates to the technical field of monorail crane track systems, in particular to a track beam.

Background

The track line of the mining monorail crane is formed by sequentially connecting a large number of I-shaped steel track beams with standard lengths. The two adjacent track beams are firmly connected by fasteners, and the fasteners are suspended and fixed on a roadway top plate through chains. When the mine pressure of the roadway changes and the roof deforms and displaces, the track line correspondingly deforms and displaces and changes in length, and adjacent track beams can be squeezed or stretched mutually. When the track beam can not adapt to the deformation displacement of the top plate through the length change of the beam body or the angle change of the connecting part of the fastener, the bending deformation or the tensile damage can be generated. The deformation and the damage of the track beam can form serious potential safety hazards, and the maintenance and the replacement of the track beam are time-consuming and labor-consuming.

Therefore, how to provide a technical solution capable of solving the above problems is a technical problem which needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a track roof beam, it passes through coupling mechanism with the movably connection of first straight rail, the straight rail of second and the straight rail in middle section, and the straight rail of first straight rail, second moves the absorbable and distortion with the straight rail in middle section to guarantee track roof beam's normal use, improved track roof beam's security.

In order to realize the above-mentioned purpose, the application provides a track roof beam, including first straight rail, the straight rail of second straight rail and the straight rail of middle section that is located between the two, the distance between first straight rail and the straight rail of second is greater than the width of the straight rail of middle section, form between first straight rail and the straight rail of middle section and/or between the straight rail of second and the straight rail of middle section and be used for absorbing the reservation gap of track roof beam deformation, first straight rail, the upside and the downside of the straight rail of middle section and second all carry out movably through coupling mechanism and be connected, coupling mechanism include with first straight rail, the straight rail of middle section and the straight rail fixed connection's of second connecting block and carry out movably connected's guide part with the connecting block.

In some embodiments, the connecting mechanism includes an upper connecting mechanism and a lower connecting mechanism, which are respectively disposed at upper and lower sides of the first straight rail, the middle straight rail and the second straight rail, the upper connecting mechanism includes an upper guide portion, and the upper connecting mechanism further includes an elastic member cooperating with the upper guide portion and the connecting block to elastically support the middle straight rail in the length direction.

In some embodiments, the guide portion in the upper connecting mechanism is an upper through shaft, the first upper connecting block has a first upper connecting hole therein, the second upper connecting block has a second upper connecting hole therein, the upper middle connecting block has an upper middle connecting hole therein, one end of the upper through shaft is provided with a shaft cap, the other end is provided with an external thread, the upper through shaft is inserted into the first upper connecting hole, the upper middle connecting hole and the second upper connecting hole, and is connected with the upper connecting nut to connect the first upper connecting block, the second upper connecting block and the upper middle connecting block.

In some embodiments, the lower connection mechanism includes a first lower connection block fixed to a lower side of the first straight rail, a second lower connection block fixed to a lower side of the second straight rail, and a lower middle connection block fixed to a lower side of the middle straight rail, a guide portion in the lower connection mechanism is a lower through shaft, the first lower connection block, the second lower connection block and the lower middle connection block are both provided with lower connection holes, the lower through shaft is inserted into the first lower connection block, the lower middle connection block and the lower connection hole of the second lower connection block, and is connected with the lower connection nut, and a distance between the lower connection nut and a shaft cap of the lower through shaft is greater than a sum of lengths of the first lower connection block, the lower middle connection block and the second lower connection block.

In some embodiments, the diameters of the first upper connecting hole, the upper middle connecting hole and the second upper connecting hole are all larger than the diameter of the upper through shaft, the middle part of the middle connecting hole is provided with a limit ring platform, the upper through shaft penetrates through an inner hole of the limit ring platform, the upper connecting mechanism further comprises a guide sleeve, the guide sleeve is arranged on the periphery of the upper through shaft, guide sleeves are arranged on two sides of the limit ring platform, and the first upper connecting hole, the upper middle connecting hole and the second upper connecting hole are in clearance fit with the guide sleeves.

In some embodiments, the limiting ring platform is connected with the middle part of the upper through shaft, the first upper connecting hole is internally provided with a limiting groove, the bottom of the limiting groove is a limiting surface facing away from the direction of the middle-section straight rail, the limiting groove is internally provided with a limiting ring attached to the limiting surface, the elastic part comprises a first spring part and a second spring part, the first spring part is positioned between the limiting ring and the shaft cap of the upper through shaft and used for pushing the middle-section straight rail to be attached to the first straight rail, the reserved gap is positioned between the middle-section straight rail and the second straight rail, and the second spring part is positioned between the upper connecting nut and the guide sleeve in the second upper connecting hole.

In some embodiments, the limit ring platform is in clearance fit with the upper through shaft, the elastic element comprises a first spring element and a second spring element, the first spring element is located between a shaft cap of the upper through shaft and a guide sleeve in the first connecting hole, the second spring element is located between an upper connecting nut and a guide sleeve in the second upper connecting hole, and reserved gaps are reserved between the first straight rail and the middle straight rail and between the middle straight rail and the second straight rail.

In some embodiments, the reserved gap and the lower side of the middle straight rail have a first preset included angle therebetween.

In some embodiments, the reserved gap and a vertical plane parallel to the length direction of the middle section straight rail form a second preset included angle.

In some embodiments, the middle straight rail and the second straight rail are both two, and both the middle straight rail and the two second straight rails are symmetrically distributed about a center line of the first straight rail.

The utility model provides a track roof beam, including the straight rail of first straight rail and second, be equipped with the straight rail in middle section between the two, distance between the straight rail of first straight rail and second is greater than the width of the straight rail in middle section, form between the straight rail in first straight rail and the straight rail in middle section and/or between the straight rail in second and the straight rail in middle section and be used for absorbing the reservation gap of track roof beam deformation, first straight rail, the upside and the downside of the straight rail in middle section and second all carry out movably connection through coupling mechanism, one set of coupling mechanism include 3 respectively with first straight rail, the straight rail in middle section and the straight rail fixed connection's in second connecting block and carry out movably connection's guide part with 3 connecting blocks.

The first straight rail, the middle straight rail and the second straight rail can move along the guide part. The track beam usually generates compression or tension deformation, a reserved gap is formed in the track beam, and the width of the reserved gap is reduced when the track beam generates compression deformation; when tensile deformation occurs, the width of the reserved gap is increased, so that the deformation is absorbed, partial load is eliminated, the normal operation of the monorail crane is ensured, and the safety of the track beam is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural view of one embodiment of a track beam provided herein;

FIG. 2 is a schematic structural view of a connection manner of the first fixed straight rail, the middle straight rail and the second fixed straight rail in FIG. 1;

fig. 3 is a schematic structural view of another connection mode of the first fixed straight rail, the middle straight rail and the second fixed straight rail in fig. 1.

Wherein the reference numerals in fig. 1 to 3 are:

the first straight rail 1, the straight rail 2 of middle section, the straight rail 3 of second, go up logical axle 4, lead to axle 5, uide bushing 6, first spring part 7, second spring part 8, go up coupling nut 9, coupling nut 10, protection end cover 11 down.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to enable those skilled in the art to better understand the scheme of the present application, the present application will be described in further detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an embodiment of a track beam provided in the present application; FIG. 2 is a schematic structural view of a connection manner of the first fixed straight rail, the middle straight rail and the second fixed straight rail in FIG. 1; fig. 3 is a schematic structural view of another connection mode of the first fixed straight rail, the middle straight rail and the second fixed straight rail in fig. 1.

The track beam provided by the present application has a structure as shown in fig. 1, and includes a first straight rail 1, a middle straight rail 2, and a second straight rail 3. The middle straight rail 2 is positioned between the first straight rail 1 and the second straight rail 3, and the three are movably connected through an upper connecting mechanism and a lower connecting mechanism. The distance between the first straight rail 1 and the second straight rail 3 is greater than the width of the middle straight rail 2, so that a reserved gap can be formed between the first straight rail 1 and the second straight rail 3 after the middle straight rail 2 is installed. The reserved gap can be located between the first straight rail 1 and the middle straight rail 2 and/or between the second straight rail 3 and the middle straight rail 2.

The first straight rail 1, the middle straight rail 2 and the second straight rail 3 are connected through a connecting mechanism. The connecting mechanism comprises an upper connecting mechanism and a lower connecting mechanism which are respectively arranged on the upper side and the lower side of the upper sides of the first straight rail 1, the middle straight rail 2 and the second straight rail 3. The upper connecting mechanism comprises a first upper connecting block, an upper middle section connecting block, a second upper connecting block and an upper guide part. The first connecting block of going up is fixed at the upside of first straight rail 1, goes up the upside at straight rail 2 of middle section at the middle section connecting block, and the connecting block is fixed at the upside of straight rail 3 of second on the second. The upper guide part is arranged parallel to the length direction of the middle section straight rail 2, and the first upper connecting block, the upper middle section connecting block and the second upper connecting block are connected with the upper guide part in a movable connection mode. The movable connection mode can refer to a connection mode of sliding block and sliding rail matching or a connection mode of hole and shaft matching in the prior art.

Lower coupling mechanism includes coupling mechanism down and includes connecting block, lower middle section connecting block, connecting block and lower guide part under the second. The first lower connecting block is fixed on the lower side of the first straight rail 1, the lower middle connecting block is fixed on the lower side of the middle straight rail 2, and the second lower connecting block is fixed on the lower side of the second straight rail 3. The lower guide part is arranged parallel to the length direction of the middle section straight rail 2, and the first lower connecting block, the lower middle section connecting block and the second lower connecting block are connected with the lower guide part in a movable connection mode.

In addition, the upper guide part and the lower guide part are both provided with limiting structures. When the track roof beam takes place tensile deformation, the distance between first straight rail 1 and the second straight rail 3 increases, and limit structure can avoid breaking away from last direction subassembly or lower direction subassembly between first straight rail 1 and the second straight rail 3.

In some embodiments, the upper connecting mechanism further comprises an elastic member, and the elastic member is matched with the upper guide part and the connecting block to elastically support the middle straight rail 2 in the length direction, so that the movement of the middle straight rail 2 when the monorail crane runs is reduced, and the effects of reducing noise and improving the rigidity of the track beam are achieved.

In some embodiments, the upper guide part is an upper through shaft 4, and the upper connecting mechanism is movably connected in a hole-shaft matching mode. As shown in fig. 2 or 3, the first upper connecting block has a first upper connecting hole therein, the second upper connecting block has a second upper connecting hole therein, and the upper middle connecting block has an upper middle connecting hole therein. The upper connecting hole is coaxially formed by the first upper connecting hole, the upper middle section connecting hole and the second upper connecting hole, the upper through shaft 4 is inserted into the upper connecting hole and is in clearance fit with the upper through hole, and therefore the movable connection of the first lower connecting block, the lower middle section connecting block and the second lower connecting block is achieved. One end of the upper through shaft 4 is provided with a shaft cap, and the other end is provided with an external thread. Go up logical axle 4 and last coupling nut 9 and link to each other, the axle cap can regard as stop gear with last coupling nut 9, and it is spacing to go up connecting block and last middle section connecting block in first last connecting block, the second through gasket etc. avoids track roof beam tensile length process to lead to taking off.

In some embodiments, the lower guide part is a lower through shaft 5, and the lower connecting mechanism is movably connected by adopting a hole-shaft matching mode. As shown in fig. 2 or 3, the first lower connecting block has a first lower connecting hole therein, the second lower connecting block has a second lower connecting hole therein, and the lower middle connecting block has a lower middle connecting hole therein. The first lower connecting hole, the lower middle section connecting hole and the second lower connecting hole are coaxially arranged to form a lower communicating hole, and the lower communicating shaft 5 is inserted into the lower communicating hole to connect the first lower connecting block, the lower middle section connecting block and the second lower connecting block. One end of the lower through shaft 5 is provided with a shaft cap, and the other end of the lower through shaft is provided with an external thread. Lower through shaft 5 links to each other with coupling nut 10 down, and the axle cap can regard as stop gear with coupling nut 10 down, carries on spacingly to connecting block under first connecting block, the second and lower middle section connecting block through gasket etc.. The distance between the lower connecting nut 10 and the shaft cap of the lower through shaft 5 is greater than the sum of the lengths of the first lower connecting block, the lower middle connecting block and the second lower connecting block. The lower connecting nut 10 and the shaft cap can play a limiting role, and loosening caused by the process of stretching the length of the track beam is avoided.

In some embodiments, the diameters of the upper communication holes formed by the first upper connection hole, the upper middle section connection hole and the second upper connection hole are all larger than the diameter of the upper through shaft 4. A guide sleeve 6 is arranged between the upper through shaft 4 and the upper communicating hole, the upper through shaft 4 is in clearance fit with the guide sleeve 6, and the guide sleeve 6 is in clearance fit with the upper communicating hole. The middle part of the middle section connecting hole is provided with a limit ring platform arranged along the circumferential direction, the diameter of an inner hole of the limit ring platform is smaller than that of the upper communicating hole, and the upper communicating shaft 4 penetrates through the inner hole of the limit ring platform. Go up coupling mechanism and still include uide bushing 6, uide bushing 6 sets up in last logical axle 4's periphery to with last logical axle 4 clearance fit. Two sides of the limit ring platform are respectively provided with a guide sleeve 6. The first upper connecting hole and the second upper connecting hole are in clearance fit with the two guide sleeves 6 respectively. The elastic component includes first spring part 7 and second spring part 8, and first spring part 7 sets up between the uide bushing 6 in connecting hole on axle cap and the first, and second spring part 8 sets up between the uide bushing 6 in connecting hole on last coupling nut 9 and the second to realize the elastic support of middle section straight rail 2.

In a specific embodiment of the present application, the inner hole of the stop collar platform has an internal thread, and the middle part of the upper through shaft 4 has an external thread. As shown in figure 2, the limit ring platform is connected with the upper through shaft 4 through threads, and the limit ring platform and the upper through shaft 4 move synchronously, so that abrasion between the upper through shaft 4 and the middle straight rail 2 is reduced. The one end that middle section straight rail 2 was kept away from to first last connecting hole has along the spacing groove of circumference setting, and the bottom of spacing groove forms towards keeping away from the straight rail 2 direction of middle section, and perpendicular first spacing face of going up the connecting hole axis, is equipped with the spacing ring with spacing face laminating in the spacing groove. The length of the guide sleeve 6 is smaller than the distance between the limiting ring and the limiting ring table. First spring part 7 is located the spacing inslot to the cover is established at last logical axle 4 periphery, and in the axial, first spring part 7 is located between spacing ring and the axle cap of last logical axle 4. The first spring member 7 is normally in compression and applies a pushing force to the nut in a direction away from the mid-section straight rail 2. Under the effect of thrust, the middle section straight rail 2 is attached to the first straight rail 1, and the reserved gap is located between the middle section straight rail 2 and the second straight rail 3. The elastic force of the first spring part 7 can reduce the movement of the middle section straight rail 2, thereby reducing the abrasion of the connecting mechanism. In order to increase the stress area, the periphery of the upper through shaft 4 is also provided with a gasket matched with the shaft cap, and the first spring part 7 exerts the thrust action on the shaft cap through the gasket. In some embodiments, one end of the first upper connecting hole, which is far away from the middle straight rail 2, is provided with a protective end cover 11, the protective end cover 11 is fixedly connected with a notch of the limiting groove, and the shaft cap of the upper through shaft 4 and the first spring part 7 are located between the protective end cover 11 and the limiting surface, so as to protect the upper through shaft 4 and the first spring part 7.

The second spring part 8 is arranged between the upper connecting nut 9 and the guide sleeve 6 in the second upper connecting hole, and the second spring part 8 is arranged between the upper connecting nut and the guide sleeve 6 in the second upper connecting hole. The length of the guide sleeve 6 in the second upper connecting hole is smaller than the distance between the end face of the second upper connecting block, which is far away from the middle section straight rail 2, and the position in front of the limiting ring platform. Note that the distance includes the width of the predetermined gap. Go up coupling nut 9 and go up the terminal surface cooperation that the straight rail 2 of middle section was kept away from to the connecting block through gasket and second, second spring part 8 is arranged in the second connecting hole. The second spring element 8 exerts an elastic force on the upper coupling nut 9 and the guide bush 6, thereby reducing the requirements of the upper coupling mechanism for the fitting accuracy.

In another embodiment of the present application, the stop collar is in clearance fit with the upper through shaft 4. As shown in fig. 3, one end of the first upper connecting hole, which is far away from the middle-section straight rail 2, is provided with a limiting groove arranged along the circumferential direction, and the bottom of the limiting groove forms a first limiting surface which faces the direction far away from the middle-section straight rail 2 and is perpendicular to the axis of the first upper connecting hole. The length of the guide sleeve 6 is smaller than the distance between the first limiting surface and the limiting ring table. The first spring piece 7 is positioned in the limiting groove and sleeved on the periphery of the upper through shaft 4. Go up coaxial periphery and still be equipped with the packing ring, packing ring and spacing groove interference fit. In the axial direction, the first spring part 7 is located between the gasket and the first limiting surface, and the first spring part 7 applies thrust towards the second straight rail 3 to the middle-section straight rail 2 through the guide sleeve 6.

The aperture of one end of the second upper connecting hole, which is far away from the middle section straight rail 2, is reduced, so that a second limiting surface facing the middle section straight rail 2 is formed. The second spring part 8 is arranged between the second limiting surface and the guide sleeve 6 in the second upper connecting hole, and the second spring part 8 exerts the thrust action of the first straight rail 1 direction of the grass fragrance to the middle section straight rail 2 through the guide sleeve 6. The thrust of the first spring element 7 and the second spring element 8 maintains the middle straight rail 2 between the first straight rail 1 and the second straight rail 3, so that a reserved gap is formed between the first straight rail 1 and the middle straight rail 2 and between the middle straight rail 2 and the second straight rail 3.

In some embodiments, as shown in fig. 1, the first straight rail 1, the middle straight rail 2 and the second straight rail 3 may be formed by a standard track beam segment, and the segment surface may be stretched to form a reserved gap. The first straight rail 1, the middle section straight rail 2 and the second straight rail 3 are collinear, the included angle between the sectioning surface and the lower side of the first straight rail 1 in the length direction is a first preset included angle, and the first preset included angle is an acute angle. When the monorail crane passes through the reserved gap, the acting force of the middle section straight rail 2 along the length direction of the track beam can enable the middle section straight rail 2 to collide with the first straight rail 1 or the second straight rail 3. The first preset included angle can reduce noise generated during collision.

In some embodiments, the reserved gap and a vertical plane parallel to the length direction of the middle straight rail 2 have a second preset included angle in the length direction of the middle straight rail 2, and the second preset included angle is also an acute angle. When the monorail crane vehicle passes through the reserved gap, time difference exists between the time when the wheels on the two sides of the track beam pass through the reserved gap, so that the impact of the wheels on the middle-section straight rail 2 can be reduced, and the noise is further reduced.

In some embodiments, the middle straight rail 2 and the second straight rail 3 are two, and as shown in fig. 1, the two middle straight rails 2 and the two second straight rails 3 are symmetrically distributed about a straight line passing through a midpoint of the first straight rail 1 and perpendicular to a lower side of the first straight rail 1. Therefore, the two sections of middle section straight rails 2 can be interchanged, and the two sections of second straight rails 3 can also be interchanged, thereby reducing the manufacturing and maintenance cost of the track beam.

In this embodiment, the track beams are arranged in segments and movably connected. When the mine pressure of the roadway changes and the top plate deforms and displaces, the track beam can generate tensile or compressive deformation, partial load is eliminated, bending deformation or tensile damage of the beam body is avoided, and normal operation of the track beam is guaranteed. In addition, the reserved gap in the track beam is arranged in an inclined mode, so that the impact of the monorail crane on the middle straight rail 2 when the monorail crane runs can be reduced, and the running noise of the monorail crane is further reduced.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The track beam provided by the present application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A track beam is characterized in that the track beam comprises a first straight track (1), a second straight track (3) and a middle straight track (2) positioned between the first straight track and the second straight track, the distance between the first straight rail (1) and the second straight rail (3) is larger than the width of the middle straight rail (2), reserved gaps for absorbing the deformation of the track beam are formed between the first straight rail (1) and the middle straight rail (2) and/or between the second straight rail (3) and the middle straight rail (2), the upper sides and the lower sides of the first straight rail (1), the middle straight rail (2) and the second straight rail (3) are movably connected through a connecting mechanism, the connecting mechanism comprises a connecting block fixedly connected with the first straight rail (1), the middle straight rail (2) and the second straight rail (3) and a guide part for movably connecting the connecting block.

2. The track beam according to claim 1, wherein the connecting mechanism comprises an upper connecting mechanism and a lower connecting mechanism, which are respectively disposed at upper and lower sides of the first straight rail (1), the middle straight rail (2) and the second straight rail (3), the upper connecting mechanism comprises an upper guide portion, and the upper connecting mechanism further comprises an elastic member cooperating with the upper guide portion and the connecting block to elastically support the middle straight rail (2) in a length direction.

3. The track beam according to claim 2, wherein the guide portion of the upper connecting mechanism is an upper through shaft (4), a first upper connecting hole is formed in a first upper connecting block, a second upper connecting hole is formed in a second upper connecting block, an upper middle connecting hole is formed in an upper middle connecting block, a shaft cap is provided at one end of the upper through shaft (4), and external threads are provided at the other end of the upper through shaft, and the upper through shaft (4) is inserted into the first upper connecting hole, the upper middle connecting hole and the second upper connecting hole and connected with an upper connecting nut (9) to connect the first upper connecting block, the second upper connecting block and the upper middle connecting block.

4. Track beam according to claim 3, characterized in that the lower connection means comprise a first lower connection block fixed to the lower side of the first straight rail (1), a second lower connection block fixed to the lower side of the second straight rail (3) and a lower mid-section connection block fixed to the lower side of the mid-section straight rail (2), the guide part in the lower connecting mechanism is a lower through shaft (5), the first lower connecting block, the second lower connecting block and the lower middle connecting block are all provided with lower connecting holes, the lower through shaft (5) is inserted into the lower connecting holes of the first lower connecting block, the lower middle section connecting block and the second lower connecting block, and the distance between the lower connecting nut (10) and the shaft cap of the lower through shaft (5) is greater than the sum of the lengths of the first lower connecting block, the lower middle connecting block and the second lower connecting block.

5. The track beam according to claim 4, wherein the diameters of the first upper connecting hole, the upper middle section connecting hole and the second upper connecting hole are larger than the diameter of the upper through shaft (4), a limit ring table is arranged in the middle of the middle section connecting hole, the upper through shaft (4) penetrates through an inner hole of the limit ring table, the upper connecting mechanism further comprises a guide sleeve (6), the guide sleeve (6) is arranged on the periphery of the upper through shaft (4), the guide sleeve (6) is arranged on two sides of the limit ring table, and the first upper connecting hole and the second upper connecting hole are in clearance fit with the guide sleeve (6) on two sides of the limit ring table respectively.

6. Rail beam as claimed in claim 5, characterised in that the stop collar is connected to the middle of the upper through-shaft (4), a limiting groove is arranged in the first upper connecting hole, the bottom of the limiting groove is a limiting surface facing to the direction far away from the middle section straight rail (2), a limiting ring which is jointed with the limiting surface is arranged in the limiting groove, the elastic piece comprises a first spring piece (7) and a second spring piece (8), the first spring part (7) is positioned between the limiting ring and the shaft cap of the upper through shaft (4) and used for pushing the middle straight rail (2) to be attached to the first straight rail (1), the reserved gap is positioned between the middle straight rail (2) and the second straight rail (3), the second spring part (8) is located between the upper connecting nut (9) and the guide sleeve (6) in the second upper connecting hole.

7. The track beam according to claim 5, characterized in that the stop collar is clearance-fitted to the upper through shaft (4), the elastic member comprises a first spring member (7) and a second spring member (8), the first spring member (7) is located between a cap of the upper through shaft (4) and a guide sleeve (6) in the first connection hole, the second spring member (8) is located between the upper connection nut (9) and the guide sleeve (6) in the second upper connection hole, and the reserved gaps are provided between the first straight rail (1) and the middle straight rail (2) and between the middle straight rail (2) and the second straight rail (3).

8. The track beam according to any one of claims 1 to 7, characterized in that the pre-gap has a first pre-set angle with the underside of the mid-section straight rail (2).

9. The track beam according to claim 8, characterized in that the reserved gap has a second preset angle with a vertical plane parallel to the length direction of the middle section straight rail (2).

10. The track beam according to claim 9, characterized in that the middle straight rail (2) and the second straight rail (3) are both two, and that both the middle straight rail (2) and both the second straight rail (3) are symmetrically distributed about the middle line of the first straight rail (1).