Annular caterpillar track structure and linear acceleration loading test equipment

Abstract

The utility model provides an annular caterpillar track structure and linear acceleration loading test equipment. The annular caterpillar track structure comprises an annular track and an annular chain, the annular rail comprises two side rails which are arranged in parallel at an interval, and the two side rails are provided with annular raceways which correspond to each other; the loop chain is used for connecting a plurality of loading vehicles in series at intervals along the annular direction of the loop chain, the loop chain comprises two chains and a plurality of connecting frames, the connecting frames are connected between corresponding chain links of the two chains, each chain link of the two chains is connected with a roller, and the rollers on the two chains are respectively and correspondingly rolled on the annular roller paths; wherein the roller comprises a first half wheel and a second half wheel which are coaxially connected; and the first half wheel and the second half wheel are respectively used for rolling rail surfaces on two sides of the annular raceway. According to the annular caterpillar track structure and the linear acceleration loading test equipment provided by the utility model, the annular raceways of the two side tracks of the annular track are utilized to guide and restrain the rollers on each chain link, so that the stability of the annular chain for driving the loading vehicle to circularly run along the annular track in the annular direction can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of road performance testing technology, specifically relating to a ring-shaped track structure and linear acceleration loading test equipment. Background Technology

[0002] Linear accelerated loading test equipment is used to comprehensively simulate the actual service conditions of road materials and structures in special geographical environments, simulate different vehicle axle load compositions, and conduct scientific research on accelerated loading tests of new structures, new materials, and new processes using full-scale tests. Most existing linear accelerated loading test equipment involves laying ground tracks along the test site, with the loading vehicle running linearly back and forth along these tracks. This operating method has significant limitations in terms of continuity and vehicle speed. Therefore, the industry is focusing on developing a method for linear accelerated loading tests where the loading vehicle runs unidirectionally along a circular track. The structure using a circular track and traction chain is crucial because its structural performance directly affects the stability and reliability of the loading vehicle's circumferential operation and the accuracy of the test data. Therefore, there is an urgent need to develop solutions specifically addressing the stability of the loading vehicle's circumferential operation. Utility Model Content

[0003] This utility model provides a ring-shaped track structure and a linear acceleration loading test equipment, which aims to improve the stability of the loading vehicle's circumferential operation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a ring-shaped track structure is provided, including a ring track and a ring chain; the ring track includes two parallel side rails spaced apart, the two side rails having corresponding annular raceways; the ring chain is used to connect several loading vehicles in series along its circumferential direction, the ring chain includes two chains and several connecting frames, connecting frames are connected between corresponding links of the two chains, and rollers are connected to each link of the two chains, each roller on the two chains respectively rolling on the annular raceways; wherein, the rollers include a first half-wheel and a second half-wheel coaxially connected; the first half-wheel and the second half-wheel are respectively used to roll on the two side rail surfaces of the annular raceways.

[0005] In conjunction with the first aspect, in one possible implementation, the side rail includes two straight sections, one above the other, and two arc sections respectively connected to the two ends of the straight sections; wherein, the upper and lower sides of the straight sections are provided with longitudinal beams for connecting the frame; the inner side of the arc section is provided with a first curved beam, and the outer side of the arc section is provided with a second curved beam.

[0006] In some embodiments, the longitudinal beam includes a straight I-beam and a plurality of first supporting ribs spaced apart in the beam slots on both sides of the straight I-beam; the first curved beam includes a curved I-beam extending into a semicircle along a circular arc trajectory and a plurality of second supporting ribs spaced apart in the beam slots on both sides of the curved I-beam; the second curved beam includes a semi-circular beam plate and a plurality of reinforcing ribs spaced apart on the side of the semi-circular beam plate.

[0007] For example, the straight section includes a straight inner rail and a straight outer rail fixedly connected to its upper and lower longitudinal beams, respectively, forming a straight raceway between the straight inner rail and the straight outer rail; the arc section includes an arc inner rail fixedly connected to a first arc beam and an arc outer rail fixedly connected to a second arc beam, forming an arc raceway between the arc inner rail and the arc outer rail; wherein, the arc raceway and the straight raceway connect to form an annular raceway; the first half-wheel rolls on the straight inner rail and the arc inner rail, and the second half-wheel rolls on the straight outer rail and the arc outer rail.

[0008] In conjunction with the first aspect, in one possible implementation, the connecting frame includes a horizontal shaft and a tripod; the two ends of the horizontal shaft pass through one end of the corresponding links of the two chains and are connected to rollers, and the horizontal shaft and the chain links are rotatably engaged; the tripod is fixedly connected to the corresponding links of the two chains and is connected to the horizontal shaft.

[0009] In some embodiments, adjacent links are connected by lugs; wherein one end of the lug is fixedly connected to the end of the link away from the transverse axis, and the other end of the lug is connected to the transverse axis passing through its adjacent link.

[0010] For example, the tripod includes a horizontal tie rod and two diagonal tie rods of equal length; wherein, the two ends of the horizontal tie rod are fixedly connected to corresponding links of two chains, and one end of the diagonal tie rod is connected to the middle of the horizontal axis, and the other end is fixedly connected to one end of the horizontal tie rod.

[0011] For example, the side wall of the chain link is provided with a connecting plate, and both the horizontal tie rod and the diagonal tie rod are connected to the connecting plate; the middle part of the horizontal shaft is provided with a clamp, and both diagonal tie rods are connected to the clamp.

[0012] In some embodiments, the frame of the loading vehicle is connected to two rollers rolled in an annular raceway on both sides by connecting shafts. Both ends of one connecting shaft are connected to the horizontal axis adjacent to the front of the loading vehicle by rigid arms, and both ends of the other connecting shaft are connected to the chain link adjacent to the rear of the loading vehicle by elastic arms.

[0013] The beneficial effects of the ring-type chain track structure provided by this utility model are as follows: Compared with the prior art, the ring-type chain track structure of this utility model uses the annular raceways of the two side rails of the ring track to provide guidance and constraint for the rollers on each chain link. The rollers can be bidirectionally supported by the first half-wheel rolling one side of the annular raceway and the second half-wheel rolling the other side of the annular raceway, thereby improving the stability of the loading vehicle running in a circular rotation along the ring track driven by the chain. On this basis, the two chains of the chain are connected into one body through the connecting frame, which not only improves the stability of the chain structure, but also ensures the synchronization of the circumferential rotation of the two chains, further improving the stability of the loading vehicle's circumferential cyclic operation.

[0014] Secondly, this utility model embodiment also provides a linear acceleration loading test equipment, including the above-mentioned ring-shaped track structure.

[0015] The beneficial effects of the linear acceleration loading test equipment provided by this utility model are as follows: Compared with the prior art, the linear acceleration loading test equipment of this utility model adopts the above-mentioned ring-type chain track structure. The annular raceways of the two side rails of the ring track provide guidance and constraint for the rollers on each chain link. The rollers can be bidirectionally supported by the first half-wheel rolling one side of the annular raceway and the second half-wheel rolling the other side of the annular raceway, thereby improving the stability of the loading vehicle running cyclically along the ring track driven by the ring chain. On this basis, the two chains of the ring chain are connected into one body through the connecting frame, which not only improves the stability of the ring chain structure, but also ensures the synchronization of the circumferential rotation of the two chains, further improving the stability of the circumferential cyclic operation of the loading vehicle. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of the ring-shaped track structure provided in the embodiment of this utility model;

[0017] Figure 2 This is a partial structural diagram of the side rail used in an embodiment of the present utility model;

[0018] Figure 3 This is a partial structural diagram of the ring chain used in an embodiment of the present utility model;

[0019] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 10. Ring rail; 100. Side rail; 101. Straight section; 1011. Straight inner rail; 1012. Straight outer rail; 102. Arc section; 1021. Curved inner rail; 1022. Curved outer rail; 103. Longitudinal beam; 1031. Straight I-beam; 1032. First supporting reinforcement; 104. First curved beam; 1041. Curved I-beam; 1042. Second supporting reinforcement; 105. Second curved beam; 1051. Semi-circular beam plate; 1052. Reinforcement. Rib plate; 1000, Circular raceway; 1001, Straight raceway; 1002, Curved raceway; 20, Ring chain; 200, Chain link; 201, Ear plate; 202, Connecting plate; 21, Chain; 22, Connecting frame; 221, Horizontal shaft; 2211, Clamp; 222, Triangular frame; 2221, Horizontal tie rod; 2222, Diagonal tie rod; 30, Loading cart; 31, Rigid arm; 32, Elastic arm; 40, Roller; 41, First half-wheel; 42, Second half-wheel. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0023] Please refer to the following: Figures 1 to 4The ring-shaped track structure provided by this utility model will now be described. The ring-shaped track structure includes a ring rail 10 and a ring chain 20; the ring rail 10 includes two parallel side rails 100, each side rail 100 having a corresponding annular raceway 1000; the ring chain 20 is used to connect several loading vehicles 30 in series along its circumferential direction, the ring chain 20 includes two chains 21 and several connecting frames 22, the connecting frames 22 are connected between corresponding links 200 of the two chains 21, and each link 200 of the two chains 21 is connected to a roller 40, each roller 40 on the two chains 21 respectively rolling on the annular raceway 1000; wherein, the roller 40 includes a first half-wheel 41 and a second half-wheel 42 coaxially connected; the first half-wheel 41 and the second half-wheel 42 are respectively used to roll on the two side rails 100 surfaces of the annular raceway 1000.

[0024] It should be noted that the installation foundation of the ring track 10 in this embodiment can be a concrete foundation structure or a steel frame. Considering the relocation of the test site, a steel frame is preferred. Specifically, the two side rails 100 are installed and fixed on the frame. The rollers 40 connected to the chain 21 on both sides of the ring chain 20, corresponding to each link 200, roll inside the annular raceway 1000 formed by the two side rails 100. Since the rollers 40 are composed of a first half-wheel 41 and a second half-wheel 42 that are coaxially connected and can rotate independently, the first half-wheel 41 can roll on one side rail 100 of the annular raceway 1000, while the second half-wheel 42 rolls on the other side rail 100 of the annular raceway 1000. Thus, the annular raceway can be used to roll the rollers. The 1000 pairs of rollers 40 form a bidirectional support, enabling the rollers 40 to travel stably without gaps within the annular raceway 1000. Furthermore, since each link 200 is equipped with a roller 40, the connection stability between the chain 21 and the annular raceway 1000 is ensured, thereby improving the stability of the chain 21's cyclic rotation within the annular raceway 1000. Further, each corresponding link 200 of the two chains 21 is laterally connected via a connecting frame 22, thus linking the two chains 21 together and ensuring the synchronization of their movements. These combined factors ensure the stability of the ring chain 20's cyclic operation along the ring track 10, thereby improving the circumferential cyclic rotation stability of the various loading vehicles 30 connected to the ring chain 20.

[0025] Compared with the prior art, the ring-type chain track structure provided in this embodiment utilizes the annular raceways 1000 of the two side rails 100 of the ring track 10 to guide and constrain the rollers 40 on each link 200. The rollers 40 can be bidirectionally supported by the first half-wheel 41 rolling one side of the annular raceway 1000 and the second half-wheel 42 rolling the other side of the annular raceway 1000. This improves the stability of the ring chain 20 driving the loading vehicle 30 to rotate cyclically along the ring track 10. On this basis, the two chains 21 of the ring chain 20 are connected into one unit through the connecting frame 22, which not only improves the stability of the ring chain 20 structure, but also ensures the synchronicity of the circumferential rotation of the two chains 21, further enhancing the stability of the circumferential cyclic operation of the loading vehicle 30.

[0026] In some embodiments, see Figure 1 and Figure 2 The side rail 100 includes two straight sections 101 and two arc sections 102 respectively connected to the two ends of the straight sections 101; wherein, the upper and lower sides of the straight sections 101 are provided with longitudinal beams 103 for connecting the frame; the inner side of the arc section 102 is provided with a first curved beam 104, and the outer side of the arc section 102 is provided with a second curved beam 105. The length of the straight section 101 matches the road surface length required for the accelerated loading test. When the loading vehicle 30 travels to the straight section 101 below, it can contact the test road surface. With the circumferential movement of the chain 20, each loading vehicle 30 passes through the test road surface in sequence, thereby satisfying the continuous loading of the test road surface. By setting longitudinal beams 103 on both sides of the straight section 101, setting a first curved beam 104 on the inner side of the curved section, and setting a second curved beam 105 on the outer side of the curved section, the straight section 101 and the curved section can be supported on both sides, thereby improving the overall structural strength and support stiffness of the side rail 100. This prevents the side rail 100 from bearing the reaction force transmitted by the loading vehicle 30, which would cause the annular raceway 1000 to deform, thereby improving the travel stability of the loading vehicle 30 along the annular raceway 1000.

[0027] In some possible implementations, please refer to 2. The longitudinal beam 103 includes a straight I-beam 1031 and a number of first supporting ribs 1032 spaced apart in the beam slots on both sides of the straight I-beam 1031; the first curved beam 104 includes a curved I-beam 1041 extending into a semicircle along a circular arc trajectory and a number of second supporting ribs 1042 spaced apart in the beam slots on both sides of the curved I-beam 1041; the second curved beam 105 includes a semi-circular beam plate 1051 and a number of reinforcing ribs 1052 spaced apart on the sides of the semi-circular beam plate 1051. Both the longitudinal beam 103 and the first curved beam 104 are I-beams. The structural strength of the longitudinal beam 103 and the first curved beam 104 is improved by inserting the first supporting rib 1032 into the beam groove of the straight I-beam 1031 and the second supporting rib 1042 into the beam grooves on both sides of the curved I-beam 1041. The structural strength of the second curved beam 105 is improved by circumferentially arranging reinforcing ribs 1052 on one side of the semi-circular beam plate 1051. This not only ensures the compactness of the overall structure of the side rail 100, but also greatly improves the structural strength and support stiffness of the side rail 100, thereby improving the operational stability.

[0028] Specifically, such as Figure 2 As shown, the straight section 101 includes a straight inner rail 1011 and a straight outer rail 1012 fixedly connected to its upper and lower longitudinal beams 103, respectively, forming a straight raceway 1001 between the straight inner rail 1011 and the straight outer rail 1012; the arc section 102 includes an arc inner rail 1021 fixedly connected to the first arc beam 104 and an arc outer rail 1022 fixedly connected to the second arc beam 105, forming an arc raceway 1002 between the arc inner rail 1021 and the arc outer rail 1022; wherein, the arc raceway 1002 and the straight raceway 1001 are connected to form an annular raceway 1000; the first half-wheel 41 rolls on the straight inner rail 1011 and the arc inner rail 1021, and the second half-wheel 42 rolls on the straight outer rail 1012 and the arc outer rail 1022.

[0029] The two ends of the straight inner rail 1011 are respectively connected and fixed to the two curved inner rails 1021, and the two ends of the straight outer rail 1012 are respectively connected and fixed to the two curved outer rails 1022, thus forming an integral closed-loop inner rail and a closed-loop outer rail. This allows the straight raceway 1001 between the straight inner rail 1011 and the straight outer rail 1012, and the curved raceway 1002 between the curved inner rail 1021 and the curved outer rail 1022 to jointly form an annular raceway 1000. The closed-loop inner rail provides support for the first half-wheel 41, and the closed-loop outer rail provides support for the second half-wheel 42, thereby achieving bidirectional support for each roller 40 along the width direction of the annular raceway 1000, eliminating running gaps, and improving overall running stability.

[0030] As one specific embodiment of the connecting bracket 22 described above, please refer to Figure 3The connecting frame 22 includes a horizontal shaft 221 and a triangular frame 222. The two ends of the horizontal shaft 221 pass through one end of the corresponding links 200 of the two chains 21 and are connected to rollers 40, with the horizontal shaft 221 rotatably engaging with the links 200. The triangular frame 222 is fixedly connected to the corresponding links 200 of the two chains 21 and is also connected to the horizontal shaft 221. By setting the horizontal shaft 221, it can provide connection and support for the two chains 21 and also serve as the mounting shaft for the rollers 40, thereby improving structural compactness. Furthermore, by using the triangular frame 222 to connect the opposing links 200 of the two chains 21 and the horizontal shaft 221 into a single unit, the structural stability of the triangular frame 222 can further improve the overall integrity between the two chains 21. Moreover, since the horizontal shaft 221 and the connecting frame are rotatably engaged, the relative swing flexibility between adjacent links 200 can be improved, thereby enhancing the smoothness and stability of each link 200 through curved sections.

[0031] For some possible implementations, please refer to [link / reference]. Figure 3 and Figure 4 Adjacent links 200 are connected by lugs 201. One end of the lug 201 is fixedly connected to the end of the link 200 away from the horizontal axis 221, and the other end of the lug 201 is connected to the horizontal axis 221 that passes through its adjacent link 200. That is, the end of the first link 200 of two adjacent links 200 is fixed to the lug 201, and the horizontal axis 221 rotatably connected to the second link 200 is also fixedly connected to the lug 201. Thus, the connection between the two adjacent links 200 is achieved by means of the horizontal axis 221 and the lugs 201, and the rotational cooperation between the horizontal axis 221 and the second link 200 allows the two links 200 to swing relative to each other around the horizontal axis 221, thereby improving the smoothness of passing through curved sections.

[0032] Optionally, in this embodiment, the structure of the tripod 222 is as follows: Figure 3 As shown, the tripod 222 includes a horizontal tie rod 2221 and two diagonal tie rods 2222 of equal length; wherein, the two ends of the horizontal tie rod 2221 are fixedly connected to the corresponding links 200 of the two chains 21 respectively, one end of the diagonal tie rod 2222 is connected to the middle of the horizontal shaft 221, and the other end is fixedly connected to one end of the horizontal tie rod 2221.

[0033] The two diagonal tie rods 2222 and the horizontal tie rod 2221 form an isosceles triangle structure, which can ensure the stability of force transmission between the two chains 21, thereby improving the stability of the two chains 21 running synchronously along the two side rails 100. Since the two ends of the horizontal tie rod 2221 are fixed to the corresponding links 200 of the two chains 21 respectively, the width of the two chains 21 at the corresponding positions of each link 200 can be guaranteed to be consistent, thereby improving the rolling reliability of the rollers 40 connected to each link 200 in the annular raceway 1000, and thus improving the overall vehicle running stability.

[0034] It should be noted that you should refer to [link / reference]. Figure 4 In this embodiment, the side wall of the chain link 200 is provided with a connecting plate 202, and the horizontal tie rod 2221 and the diagonal tie rod 2222 are both connected to the connecting plate 202; the middle part of the horizontal shaft 221 is provided with a clamp 2211, and the two diagonal tie rods 2222 are both connected to the clamp 2211. The connecting plate 202 can be an angle plate, which is welded and fixed to the side wall of the chain link 200 on one side, and the other side is used to provide space for connecting the horizontal tie rod 2221 and the diagonal tie rod 2222. The clamp 2211 provided in the middle part of the horizontal shaft 221 can be fixed by two semi-arc plates interlocking. After the end of the diagonal tie rod 2222 is flattened, it is inserted between the two semi-arc plates and then fastened by fasteners passing through the edges of the two semi-arc plates and the end of the diagonal tie rod 2222. The structure is simple, reliable and easy to disassemble and assemble.

[0035] It should be noted that, in combination Figure 1 and Figure 3 It is understood that both sides of the frame of the loading vehicle 30 are connected by connecting shafts to two rollers 40 rolled within the annular raceway 1000. Both ends of one connecting shaft are connected to the adjacent transverse axle 221 at the front of the loading vehicle 30 via rigid arms 31, and both ends of the other connecting shaft are connected to the adjacent chain link 200 at the rear of the loading vehicle 30 via elastic arms 32. By configuring the rollers 40 rolled within the annular raceway 1000, the loading vehicle 30's operational stability is improved. This creates an operating state where the chain 20 provides traction to the loading vehicle 30, and the ring rail 10 provides guidance and support. This allows the reaction force on the loading vehicle 30 to be directly transmitted to the ring rail 10, thereby preventing the chain 20 from breaking under stress. One side of the loading vehicle 30 is connected to the adjacent horizontal shaft 221 via a rigid arm 31, and the other side is connected to the adjacent horizontal shaft 221 via an elastic arm 32. This improves the connection reliability of the loading vehicle 30 on the chain 20 and provides a buffering effect using the elastic arm 32, preventing the horizontal shaft 221 from being rigidly impacted by the loading vehicle 30 when it goes from unloaded to loaded, thus ensuring the stability and reliability of the test operation.

[0036] Based on the same inventive concept, please combine Figures 1 to 4It is understood that this application embodiment also provides a linear acceleration loading test equipment, including the above-mentioned ring track structure.

[0037] Compared with the prior art, the linear acceleration loading test equipment provided in this embodiment adopts the above-mentioned ring-type chain track structure. The annular raceways 1000 of the two side rails 100 of the ring track 10 provide guidance and constraint for the rollers 40 on each chain link 200. The rollers 40 can be bidirectionally supported by the first half-wheel 41 rolling one side of the annular raceway 1000 and the second half-wheel 42 rolling the other side of the annular raceway 1000. This improves the stability of the ring chain 20 driving the loading vehicle 30 to rotate cyclically along the ring track 10. On this basis, the two chains 21 of the ring chain 20 are connected into one body through the connecting frame 22. This not only improves the stability of the ring chain 20 structure, but also ensures the synchronicity of the circumferential rotation of the two chains 21, further improving the stability of the circumferential cyclic operation of the loading vehicle 30.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A ring-type chain track structure, characterized by, The application relates to a ring rail and a ring chain; the ring rail comprises two parallel and spaced side rails, and the two side rails have corresponding annular tracks; the ring chain is used for connecting a plurality of loading vehicles in a ring direction, and the ring chain comprises two chains and a plurality of connecting frames; the connecting frames are connected between corresponding chain links of the two chains; each chain link of the two chains is connected with a roller; each roller on the two chains is correspondingly rolled on the annular track; the roller comprises coaxially connected first and second half rollers; the first and second half rollers are used for rolling on the two side rail surfaces of the annular track.

2. The ring chain track structure of claim 1, wherein, The side rail comprises upper and lower straight sections and two circular arc sections which are respectively connected to the two ends of the straight sections; the upper and lower sides of the straight sections are provided with longitudinal beams for connecting a rack; the inner side of the circular arc section is provided with a first curved beam, and the outer side of the circular arc section is provided with a second curved beam.

3. The ring chain track structure of claim 2, wherein, The longitudinal beam comprises a straight I-beam and a plurality of first supporting ribs which are arranged in two side beam grooves of the straight I-beam; the first curved beam comprises a curved I-beam which is semicircular along a circular arc track and a plurality of second supporting ribs which are arranged in two side beam grooves of the curved I-beam; the second curved beam comprises a semicircular beam plate and a plurality of reinforcing rib plates which are arranged in a circular arc on the side of the semicircular beam plate.

4. The ring chain track structure of claim 2, wherein, The straight section comprises a straight inner rail and a straight outer rail which are fixedly connected to the upper and lower longitudinal beams respectively, and a straight track is formed between the straight inner rail and the straight outer rail; the circular arc section comprises a curved inner rail which is fixedly connected to the first curved beam and a curved outer rail which is fixedly connected to the second curved beam, and a curved track is formed between the curved inner rail and the curved outer rail; the curved track and the straight track form the annular track; the first half roller is rolled on the straight inner rail and the curved inner rail, and the second half roller is rolled on the straight outer rail and the curved outer rail.

5. The ring chain track structure of claim 1, wherein, The connecting frame comprises a horizontal shaft and a triangular frame; the two ends of the horizontal shaft pass through one end of corresponding chain links of the two chains and are connected with the rollers, and the horizontal shaft is rotationally connected with the chain links; the triangular frame is fixedly connected with corresponding chain links of the two chains and is connected with the horizontal shaft.

6. The ring chain track structure of claim 5, wherein, The adjacent chain links are connected through an ear plate; one end of the ear plate is fixedly connected with the end of the chain link which is away from the horizontal shaft, and the other end of the ear plate is connected with the horizontal shaft which passes through the adjacent chain links.

7. The ring chain track structure of claim 5, wherein, The triangular frame comprises a horizontal pull rod and two inclined pull rods which have equal lengths; the two ends of the horizontal pull rod are fixedly connected with corresponding chain links of the two chains; one end of the inclined pull rod is connected with the middle part of the horizontal shaft, and the other end is fixedly connected with one end of the horizontal pull rod.

8. The ring chain track structure of claim 7, wherein, The side wall of the chain link is provided with a connecting plate, and the horizontal pull rod and the inclined pull rod are connected with the connecting plate; the middle part of the horizontal shaft is provided with a hoop, and the two inclined pull rods are connected with the hoop.

9. The ring chain track structure of claim 8, wherein, The frame of the loading vehicle is connected with two rollers rolling in the annular track through connecting shafts on both sides, wherein the two ends of one connecting shaft are connected with the transverse shaft adjacent to the front of the loading vehicle through rigid arms, and the two ends of the other connecting shaft are connected with the chain links adjacent to the rear of the loading vehicle through elastic arms.

10. Linear acceleration loading test equipment, characterized in that, The ring type chain track structure as claimed in any one of claims 1-9.

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