RU160800U1 - TROLLEY AND FREIGHT TRAIN IN WHICH IT IS USED - Google Patents

Abstract

1. A trolley containing two wheelsets, two side frames located on the transverse outer sides of the two wheelsets, and a cradle connected between the two side frames, the trolley also comprising a first connecting rod and a second connecting rod that are intersected and pass through preformed holes located in the lower part of the cradle, the first end section of the first connecting rod and the first end section of the second connecting rod ugo connected to one of the two side frames, the second end portion of the first connecting rod and the second end portion of the second connecting rod are elastically connected to another frame of these two side frames, characterized in that the first connecting rod and the second connecting rod are in the same horizontal planes. 2. The trolley according to claim 1, in which one rod from the first connecting rod and the second connecting rod is made with a through hole in the middle part, and the other rod passes through this through hole. The trolley according to claim 1, in which one rod of the first connecting rod and the second connecting rod in the middle part is made with a first curved section protruding upward, and another rod in the middle part is made with a second curved section protruding downward and interacts with the first curved a section, wherein the first connecting rod and the second connecting rod are intersected with each other in the first curved section and the second curved section. The trolley according to claim 1, in which one rod from the first connection

Description

[0001] This application claims the priority advantage of Chinese Patent Application No. 201210404118.1 titled “TROLLEY AND CAR WITH A TROLLEY” filed with the Chinese State Intellectual Property Office on October 22, 2012, the full disclosure of which is incorporated herein by reference.

FIELD OF TECHNOLOGY

[0002] This application relates to transport equipment and, in particular, to a trolley and a wagon with such a trolley.

BACKGROUND

[0003] The trolley is one of the most important parts in the design of a railway vehicle and is used primarily to increase the load-bearing capacity, length and volume of the vehicle, as well as to increase the speed of the vehicle so that it is without load or heavy load can have good working qualities when working at low speed or high speed on a given section of the railway track, ensuring the safety of the vehicle and cargo and, accordingly, Via the requirements of developing rail links. In accordance with the method of transferring the load between the vehicle body and the bogie, the bogies can be divided into frame-type bogies, quasi-frame-type bogies and three-piece bogies.

[0004] FIG. 1 shows a top view of a known three-piece trolley. The design of the trolley and its drawbacks during operation will be briefly presented below.

[0005] A known trolley, as shown in FIG. 1, contains two wheelsets 2, two side frames 1, located on the transverse outer side of the two wheelsets 2, and the cradle 5, rigidly attached to the Central positions of the two side frames 1. The truck also contains a first connecting rod 71 and a second connecting rod 72, which are crossed in the form of the letter X and pass through preformed holes located on two sides of the lower part of the cradle 5. The first end section 711 of the first connecting rod 71 and the first end section 721 of the second the connecting rod 72 are elastically connected to one of the two side frames 1 and are symmetrical with respect to the center line of the cradle beam 5. The second end portion 712 of the first connecting rod 71 and the second end section 722 of the second connecting rod 72 are elastically connected to the other frame from these two side frames 1 and symmetrical relative to the center line of the cradle beam 5. When using this design, the displacement and deformation of the two side frames 1 in the transverse direction and in the longitudinal direction are limited to four a mechanism formed by the first connecting rod 71 and the second connecting rod 72, which increases the rigidity of the carriage trolley with resistance to distortion of the diamond shape and provides the operating speed of a three-element trolley cast from steel.

[0006] FIG. 2 is a schematic view of the structure of two connecting rods of FIG. 1. The first connecting rod 71 and the second connecting rod 72 are vertically overlapped and intersected, and the intersecting parts of the two connecting rods are separated from each other. Since the first connecting rod 71 and the second connecting rod 72 are not in the same horizontal plane, an additional moment will form on the side frames 1, which can lead to an uneven load on the two side frames 1 and affect the working speed of the trolley. In addition, the first connecting rod 71 and the second connecting rod 72 having the above construction occupy a relatively large space and necessitate a large pre-made hole located on the lower part of the cradle 5, which can affect the stability of the cradle 5.

[0007] CN 2910705 Y discloses a railcar carriage comprising a pair of wheels, two side frames, a sprung beam, a damping device, an adapter and a spring, with two connecting rods crossing each other through a pre-installed hole in the bottom of the sprung beam; the two ends of the connecting rods are elastically connected to the two side frames as a whole, forming a four-rod connecting mechanism, the two ends of the side frames are supported on the wheelset using an adapter through an elastic rubber cushion. With respect to FIG. 3 and 4, FIG. 3 is a schematic view of the structure of the connecting portion of the bearing adapter 12 of FIG. 1, and FIG. 4 is a schematic view of the structure of the elastic mounting device 3 of FIG. 3. An adapter assembly is located between the side frame 1 and the rotating shaft of the wheelset 2 to transfer load and form a transverse and longitudinal gap between the bearing and the support of the side frame 1. The adapter assembly includes an adapter 12 and a saddle-shaped elastic mounting device 3, and the mounting pin 34 is placed in the middle part of the elastic adjusting device 3 to ensure positioning of the side frame 1, the adapter 12 and the elastic adjusting device 3. However, the alignment pin 34 is welded into the holes on the upper cushioning plate and the lower cushioning plate 33 of the elastic mounting device 3, and such a welded structure has low strength and reliability.

[0008] In this regard, to solve the above technical problems, there is an urgent need to further optimize the design of the known carriage in order to equalize the load on the two side frames of the carriage during operation, to prevent the occurrence of additional torque and increase the reliability of the connection of the adapter assembly.

DISCLOSURE OF TECHNICAL SOLUTION

[0009] The objective of the present application is to create a trolley in which the load is able to equalize when working on two side frames of the trolley, to prevent the development of an additional moment and to increase the reliability of the connection of the adapter assembly. Based on this, another objective of this application is the creation of a wagon having such a trolley.

[0010] To solve the above technical problems, the trolley disclosed according to the present application comprises two wheelsets, two side frames located on the transverse outer sides of the two wheelsets, and a cradle connected between two side frames; the trolley further comprises a first connecting rod and a second connecting rod, which are intersected with each other and pass through preformed holes located in the lower part of the cradle, and the first end portion of the first connecting rod and the first end section of the second connecting rod are elastically connected to one of two side frames, a second end portion of the first connecting rod and a second end portion of the second connecting rod are elastically connected to another frame and h of the two side frames, the first connecting rod and the second connecting rod are in the same horizontal plane.

[0011] In a preferred embodiment, one rod of the first connecting rod and the second connecting rod is made with a through hole in the middle part, and the other rod passes through this through hole.

[0012] In a preferred embodiment, one rod of the first connecting rod and the second connecting rod in the middle part is made with a first curved section protruding upward, and another rod in the middle part is made with a second curved section protruding downward and interacts with the first curved section and wherein the first connecting rod and the second connecting rod are intersected with each other in the first curved section and the second curved section.

[0013] In a preferred embodiment, one rod of the first connecting rod and the second connecting rod in the middle part is made with a first curved section protruding upward or a second curved section protruding downward, and the other rod is made horizontally as a whole, the first connecting rod and the second connecting rod are intersected with each other in the first curved section or the second curved section.

[0014] In a preferred embodiment, each rod of the first connecting rod and the second connecting rod is made in one piece.

[0015] In a preferred embodiment, the trolley further comprises an adapter located on the outside of the wheelset and below the side frame, and a saddle-shaped elastic mounting device is made between the adapter and the side frame and includes an upper cushioning plate, a lower cushioning plate and an elastomeric cushion located between upper cushioning plate and lower cushioning plate; the first stopper protruding upward and the second stopper protruding downward respectively are formed on the upper cushioning plate and the lower cushioning plate, and the first locking recess and the second locking recess are respectively made in corresponding places facing the elastic mounting device, the side frame and the adapter, with this first stopper and the second stopper are respectively inserted into the first stopper recess and the second stopper recess for locking with engagement; moreover, the first stopper and the upper gasket plate are made in one piece, and the second stopper and the lower gasket plate are made in one piece.

[0016] In a preferred embodiment, the cross section of the first stopper and the second stopper has a triangular shape, the first stopper and the second stopper each having a thickness gradually decreasing from the base end to the tail end.

[0017] In a preferred embodiment, two first stoppers and two second stoppers are provided, the two first stoppers respectively being formed at two transverse ends of the middle portion of the upper gasket plate, and the two second stoppers respectively formed at two transverse ends of the middle portion of the lower gasket plate.

[0018] In a preferred embodiment, the two sides of the side frame are respectively arranged on supporting bases that are symmetrical with respect to the center line of the cradle, the shaft is fixed on the supporting base, and each connecting rod is provided with a mounting hole in an end portion and is worn outside the shaft through a mounting hole, and the upper end of the shaft is threadedly connected to the nut.

[0019] The trolley according to the present application comprises a first connecting rod and a second connecting rod that are intersected with each other and pass through preformed holes located in the lower part of the cradle, the first end portion of the first connecting rod and the first end section of the second connecting rod are elastically connected with one of the two side frames, the second end portion of the first connecting rod and the second end section of the second connecting rod are elastically connected s on the other frame of the two side frames, and wherein the first connecting rod and second connecting rod are in the same horizontal plane.

[0020] When using this design, the first connecting rod and the second connecting rod are in the same horizontal plane and are separated from each other in the intersection region, while the forces transmitted from the first connecting rod and the second connecting rod to the two side frames are relatively uniform during operation of the trolley, which provides the possibility of balancing the loads on two side frames, preventing the development of additional moment developed by the side frame, and is provided I stability in the truck. In addition, the first connecting rod and the second connecting rod are in the same horizontal plane, so that the first connecting rod and the second connecting rod occupy only a relatively small space, and accordingly, pre-formed holes located on the lower part of the cradle can be reduced. beams, which leads to an additional increase in the structural strength of the trolley.

[0021] Furthermore, a wagon is provided herein that includes a vehicle body and a trolley attached to a lower portion of the vehicle body, the trolley being one of the trolleys described above.

[0022] Since the trolley has the above technical effects, a car having such a trolley also has corresponding technical effects that will not be described here.

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a top view of a known three-piece trolley;

[0024] FIG. 2 is a schematic view of the structure of two connecting rods of FIG. one;

[0025] FIG. 3 is a schematic view of the structure of the connecting portion of the bearing adapter of FIG. one;

[0026] FIG. 4 is a schematic view of the structure of the resilient mounting device of FIG. 3;

[0027] Figure 5 is a schematic view of the structure of a first embodiment of two connecting rods of a cart according to the present application;

[0028] Figure 6 is a schematic structural view of a second embodiment of two connecting rods of a trolley according to the present application;

[0029] Figure 7 is a schematic view of a design of intersecting parts of a third embodiment of two connecting rods of a cart according to the present application;

[0030] Figure 8 is a perspective view of a first embodiment of an elastic trolley mounting fixture according to the present application;

[0031] Figure 9 is a schematic view of the structure of the connecting part between the support base and the connecting rod of the trolley according to the present application and

[0032] Figure 10 is a schematic view of a structure of a car according to an embodiment of the present application.

[0033] The reference numbers in FIG. 1-10 and the components are related as follows.

100 trolley;

1 side frame;

12 bearing adapter;

13 supporting base;

131 rubber conical sleeve;

134 nut;

137 shaft;

138 seal;

139 gasket;

200 vehicle body;

2 wheelset;

3 axial elastic mounting device;

31 elastomeric pillow,

32 upper cushioning plate,

321 first stopper;

33 lower gasket plate;

331 second stopper;

34 installation pin;

5 cradle;

71 first connecting rod;

711 a first end portion of a first connecting rod;

712 a second end portion of the first connecting rod;

713 first curved section;

714 through hole;

72 second connecting rod;

721 a first end portion of a second connecting rod;

722 second end portion of the second connecting rod;

723 second curved section.

DETAILED DESCRIPTION

[0034] The object of the present application is to provide a trolley in which it is possible to equalize the load on the two side frames of the trolley during operation, to prevent the development of an additional moment and to increase the reliability of the connection of the adapter assembly. Based on this, another objective of this application is the creation of a wagon having such a trolley.

[0035] In order for those skilled in the art to better understand the technical solutions in this application, it will hereinafter be described in detail in conjunction with the drawings and embodiments. It should be noted that the noun “longitudinality” in this application refers to the direction of the trolley along the length of the track when the trolley is on the railway track, that is, the direction passing from right to left in FIG. one; and the noun "transverse" refers to the direction of the trolley along the width of the track when the trolley is on the railway track, that is, the direction extending from top to bottom in FIG. 1. It should be borne in mind that nouns are determined on the basis of the attached drawings to the description, which should not be construed as limiting the scope of protection for this application.

[0036] A trolley according to an embodiment of the present application comprises two wheelsets 2, two side frames 1 located on the transverse outer sides of the two wheelsets 2, and a cradle 5 connected in the central positions of the two side frames 1. The trolley further comprises a first connecting the rod 71 and the second connecting rod 72, which are intersected in the form of the letter X and pass through preformed holes located on two sides of the lower part of the cradle beam 5, and the intersecting parts of the first the flax rod 71 and the second connecting rod 72 are separated from each other. The first end portion 711 of the first connecting rod 71 and the first end portion 721 of the second connecting rod 72 are resiliently connected to one of the two side frames 1 and are symmetrical with respect to the center line of the beam beam 5. The second end portion 712 of the first connecting rod 71 and the second end portion 722 of the second connecting the rod 72 is elastically connected to another frame of the two side frames 1 and are symmetrical about the center line of the cradle beam 5. In addition, the first connecting rod 71 and the second joint itelny rod 72 are in the same horizontal plane.

[0037] Using this design, the first connecting rod 71 and the second connecting rod 72 are in the same horizontal plane and are separated from each other in the intersection region, while the forces transmitted from the first connecting rod 71 and the second connecting rod 72 to two lateral frames 1, are relatively uniform when the cart, in which it is possible to equalize the loads on the two side frames 1, prevent the development of additional moment developed by the side frame 1, and ensure stability during operation of the trolley. In addition, the first connecting rod 71 and the second connecting rod 72 are in the same horizontal plane, so that the first connecting rod 71 and the second connecting rod 72 occupy only a relatively small space, and accordingly, pre-formed openings located on the lower part of the cradle beam 5, which leads to an additional increase in the structural strength of the trolley.

[0038] It should be noted that the description "the first connecting rod 71 and the second connecting rod 72 are in the same horizontal plane" in this application means that the four end sections of the two connecting rods are in the same horizontal plane, and the axis in the longitudinal direction of the first connecting rod 71 and the axis in the longitudinal direction of the second connecting rod 72 are approximately in the same horizontal plane, but does not mean that all parts of the first connect the flax rod 71 and the second connecting rod 72 are in the same horizontal plane. Some parts of the first connecting rod 71 and the second connecting rod 72 may not be in the same horizontal plane.

[0039] The construction of the first connecting rod 71 and the second connecting rod 72 in the same horizontal plane will be described in detail by the following embodiments.

[0040] FIG. 5 is a schematic structural view of a first embodiment of two connecting rods of a trolley according to the present application.

[0041] In an embodiment, as shown in FIG. 5, one rod from the first connecting rod 71 and the second connecting rod 72 is formed with a through hole 714 in the middle part, and another rod passes through this through hole 714.

[0042] When using such a design, one connecting rod is provided with a through hole 714 to create an intersection space for another connecting rod, which in a simple and convenient manner avoids touching the two connecting rods in the intersection area and provides placement of the first connecting rod 71 and the second connecting rod 72 in the same horizontal plane.

[0043] FIG. 6 is a schematic structural view of a second embodiment of two connecting rods of a cart according to the present application.

[0044] In yet another embodiment, as shown in FIG. 6, one rod from the first connecting rod 71 and the second connecting rod 72 in the middle part is made with a first curved section 713 protruding upward, and another rod in the middle part is made with a second curved section 723 protruding downward and interacting with the first curved section 713, wherein the first connecting rod 71 and the second connecting rod 72 are intersected at the first curved portion 713 and the second curved portion 723.

[0045] Using this design, protrusions are made that protrude in opposite directions on the first curved portion 713 and the second curved portion 723 to create more space in the middle parts of the two connecting rods so that the first connecting rod 71 and the second connecting rod 72 are crossed with each other, can be separated from each other and be in the same horizontal plane. In addition, the first connecting rod 71 and the second connecting rod 72 with this design complement each other and are consistent with each other and can maintain a symmetrical design that can equalize the voltage on the two connecting rods during operation of the trolley and additionally provide structural strength of the connection between the two connecting rods and side frames 1.

[0046] FIG. 7 is a schematic structural view of a third embodiment of two connecting rods of a cart according to the present application.

[0047] In yet another embodiment, as shown in FIG. 7, one rod from the first connecting rod 71 and the second connecting rod 72 in the middle part is made with a first curved section 713 protruding upward or a second curved section 723 protruding downward, and the other rod is made horizontally as a whole, the first connecting rod 71 and the second connecting rod 72 are intersected at a first curved portion 713 or a second curved portion 723.

[0048] When using this design, one connecting rod is made with a curved portion to create an intersection space for another connecting rod, which can also realize the task of placing said two connecting rods in the same horizontal plane. Such a design simply requires refinement of one connecting rod in order to accomplish the task of placing said two connecting rods in the same horizontal plane and, as a result, has the features of a simple design and is simple to manufacture and process.

[0049] It is obvious that the design of the first connecting rod 71 and the second connecting rod 72 is not limited to the above embodiments, other designs can also be used.

[0050] Furthermore, both rods from the first connecting rod and the second connecting rod can be integrally formed. For example, the curved portion of the connecting rod and the housing of the connecting rod shown in FIG. 6 and 7 are made in one piece. Compared to a structure in which a curved portion is welded or riveted to the body of the connecting rod, the above structure can further increase the structural strength and provide stability during operation of the trolley. Of course, both rods of the first connecting rod 71 and the second connecting rod 72 can also be performed separately. For example, in the structure shown in FIG. 5, the top cover and the bottom cover are welded respectively above the two main bodies of one connecting rod and below the two main bodies of the other connecting rod so that the through hole 714 for the through passage of the other connecting rod is surrounded by a top cover, a lower cover and two main bodies of the connecting rod. Users can choose the design according to their requirements.

[0051] Other cart designs may also be used.

[0052] FIG. 8 is a perspective view of a first embodiment of an elastic trolley mounting device 3 according to the present application.

[0053] In yet another embodiment, as shown in FIG. 3 and 8, the trolley further comprises an adapter 12 located on the outer side of the wheelset 2 and lower than the side frame 1, and a saddle-shaped elastic mounting device 3, located between the adapter 12 and the side frame 1. The saddle-shaped elastic mounting device 3 contains an upper spacer plate 32 the lower cushioning plate 33 and the elastomeric cushion 31 located between the upper cushioning plate 32 and the lower cushioning plate 33. The first stop 321 protruding upward and the second stopper 331 protruding downward, respectively They are made on the upper gasket plate 32 and the lower gasket plate 33, and the first locking recess and the second locking recess, respectively, are made in the corresponding places facing the elastic mounting device 3, the side frame 1 and the adapter 12, while the first stop 321 and the second stop 331 respectively inserted into the first locking recess and the second locking recess for locking with engagement. The first stopper 321 and the upper gasket plate 32 are made in one piece, and the second stopper 331 and the lower gasket plate 33 are made in one piece.

[0054] When using this design, the interaction between the stoppers and the locking recesses can ensure the accuracy of the lateral frame 1, the elastic mounting device 3 and the adapter 12 during the operation of the trolley and prevent lateral displacement and longitudinal displacement of the side frame 1, the elastic mounting device 3 and the adapter 12 , resulting in increased stability of the trolley during operation and its reliability. In addition, since the first stopper 321 and the upper gasket plate 32 are integrally formed, and the second stopper 331 and the lower gasket plate 33 are integrally formed, the structural strength and reliability of the elastic adjusting device 3 are further enhanced compared to the known welded construction of the locating pin 34 .

[0055] In yet another solution, as shown in FIG. 8, the cross section of the first stopper 321 and the second stopper 331 may be triangular in shape, and the first stopper 321 and the second stopper 331 each have a thickness gradually decreasing from the base end to the tail end. Compared to the tail section, the base portion of the first stop 321 and the second stop 331 can withstand a large load, which can help prevent the first stop 321 and the second stop 331 from falling off from the upper gasket plate 32 and the lower gasket plate 33 due to too much shear and to further provide stability when working stoppers. Of course, the above two stoppers are not limited to the above-described forms, but may have other forms.

[0056] In yet another solution, two first stoppers 321 and two second stoppers 331 are provided, wherein the first two stoppers 321 are respectively formed at two transverse ends of the middle portion of the upper gasket plate 32, and the two second stoppers 331 respectively are formed at two transverse ends of the middle portion of the lower the spacer plate 33, thereby providing uniform stress on the elastic adjusting device 3 during operation. Of course, a different number of stoppers can be performed.

[0057] Other cart designs may also be used.

[0058] FIG. 9 is a schematic view of the structure of the connecting part between the support base and the connecting rod of the cart according to the present application.

[0059] In yet another embodiment, as shown in FIG. 9, the two sides of the side frame 1 are respectively placed on the supporting bases 13, which are symmetrical with respect to the center line of the cradle beam 5, and the shaft 137 is fixed on the supporting base 13. Each connecting rod is made with a mounting hole at the end portion and is worn outside the shaft 137 through a mounting hole . A seal 138 and a gasket 139 are installed at the upper end of the shaft 137, and then the shaft 137 is threadedly connected to the nut 134. In addition, a rubber conical sleeve 131 can be placed between the shaft 137 and the connecting rod. Using this design, the elastic connection between the support base 13 and a connecting rod can be implemented simply and conveniently. Of course, the support base 13 and the connecting rod can be connected in other ways.

[0060] FIG. 10 is a schematic view of a structure of a car according to an embodiment of the present application.

[0061] Based on the trolley described above, a wagon according to the present application is also provided. As shown in FIG. 10, the wagon comprises a vehicle body 200 and a trolley 100 attached to a lower portion of the vehicle body 200, the trolley 100 being the trolley described above.

[0062] Since the trolley has the above technical effects, a car having such a trolley also has corresponding technical effects that will not be described here.

[0063] The trolley and wagon having such a trolley according to the present application are described in detail above. The principle and embodiments of this application are illustrated herein by way of specific examples. The above description of the examples is intended only to facilitate understanding of the methodology and nature of this application. It should be noted that many modifications and improvements to this application are apparent to those skilled in the art without departing from the essence of this application, and these modifications and improvements are also considered to be within the scope of protection of this application, determined by the attached formula.

Claims (10)

1. A trolley containing two wheelsets, two side frames located on the transverse outer sides of the two wheelsets, and a cradle connected between the two side frames, the trolley also comprising the first connecting rod and the second connecting rod, which are intersected with each other and pass through preformed holes located in the lower part of the cradle, while the first end portion of the first connecting rod and the first end portion of the second connecting rod are elastically connected to one of the two side frames, the second end section of the first connecting rod and the second end section of the second connecting rod are elastically connected to another frame of these two side frames, characterized in that the first connecting rod and the second connecting rod are in the same horizontal plane. 2. The trolley according to claim 1, in which one rod of the first connecting rod and the second connecting rod is made with a through hole in the middle part, and the other rod passes through this through hole. 3. The trolley according to claim 1, in which one rod of the first connecting rod and the second connecting rod in the middle part is made with a first curved section protruding upward, and another rod in the middle part is made with a second curved section protruding downward, and interacts with the first curved section, the first connecting rod and the second connecting rod intersected with each other in the first curved section and the second curved section. 4. The trolley according to claim 1, in which one rod of the first connecting rod and the second connecting rod in the middle part is made with a first curved section protruding upward or a second curved section protruding downward, and the other rod is made horizontally as a whole, the first connecting rod and the second connecting rod are intersected with each other in the first curved section or the second curved section. 5. The trolley according to any one of claims 1 to 4, in which each rod from the first connecting rod and the second connecting rod is made in one piece. 6. The trolley according to any one of claims 1 to 4, in which the cart also contains an adapter located on the outside of the wheelset and below the side frame, and a saddle-shaped elastic mounting device is made between the adapter and the side frame and contains an upper gasket plate, a lower gasket plate and an elastomeric pillow located between the upper gasket plate and the lower gasket plate; the first stopper protruding upward and the second stopper protruding downward respectively are formed on the upper cushioning plate and the lower cushioning plate, and the first locking recess and the second locking recess are respectively made in corresponding places facing the elastic mounting device, the side frame and the adapter, with this first stopper and the second stopper are respectively inserted into the first stopper recess and the second stopper recess for locking with engagement; moreover, the first stopper and the upper gasket plate are made in one piece, and the second stopper and the lower gasket plate are made in one piece. 7. The trolley according to claim 6, in which the cross section of the first stopper and the second stopper has a triangular shape, and the first stopper and the second stopper each have a thickness gradually decreasing from the base end to the tail end. 8. The trolley according to claim 7, in which two first stops and two second stops are made, wherein the first two stops are respectively made at two transverse ends of the middle part of the upper gasket plate, and the two second stops are respectively made at two transverse ends of the middle part of the lower gasket . 9. A trolley according to any one of claims 1 to 4, in which two sides of the side frame are respectively placed on supporting bases that are symmetrical with respect to the center line of the cradle, the shaft is mounted on the supporting base, and each connecting rod is made with a mounting hole at the end portion and worn on the outside of the shaft through the mounting hole, and the upper end of the shaft is threadedly connected to the nut. 10. A wagon, characterized in that it comprises a vehicle body and a trolley attached to the lower portion of the vehicle body, the trolley being a trolley according to any one of claims 1 to 9.

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