CN106404365A - Tension machine tail vehicle test device - Google Patents

Abstract

The invention provides a test device for a tensioner tailcar, which comprises: a support device for supporting both ends of a bearing shaft in a tensioner tailcar; a loading device detachably connected to the bearing shaft for The bearing shaft exerts pressure; the pressure testing device is arranged on the loading device to detect the pressure on the bearing shaft. The invention applies pressure to the bearing shaft through the loading device, and detects the deformation of the bearing shaft when the allowable load of the bearing shaft is reached, and then judges whether the strength of the bearing shaft meets the requirements according to the deformation of the bearing shaft, thereby ensuring that the bearing shaft is accurately Optional matching, so that the selected bearing shaft can meet the performance requirements of the tension machine tail car, with a high safety factor, which improves the accuracy of the selection of the bearing shaft, avoids the excessive strength of the selected bearing shaft, and reduces the tension The weight and cost of the tail truck.

Description

Test device for tensioned tailcar

technical field

The invention relates to the technical field of power transmission line construction tools, in particular to a test device for a tension locomotive.

Background technique

With the rapid development of my country's economy and the rapid growth of electricity load, the erection of transmission line projects has also increased. Tension stringing construction is an important link in transmission line engineering, and the tension tail car for overhead transmission lines is one of the main equipment necessary for tension stringing construction. Construction is closely related, so ensuring the carrying capacity of the tension machine tail car is the basis for the smooth progress of tension pay-off.

In order to ensure a stable supply of electric power, the requirements for construction equipment for tension stringing are gradually increasing. Among them, the bearing shaft of the tensioner tail car is an important construction part of the tensioner tail car. The strength and bearing capacity of the bearing shaft are an important index affecting the performance of the tensioner tail car, and it is also the key to selecting a suitable bearing shaft. factor. Under normal circumstances, the selection of the bearing shaft of the tensioner tail car is generally based on engineering experience. In this way, the strength and bearing capacity of the selected bearing shaft are high, the safety factor is high, and the size of the bearing shaft is too large, which greatly increases Reduced the weight and cost of the tensioned tailcar. It is theoretically reasonable to use static calculations to select the bearing shaft based on the principles of material mechanics, but it ignores the influence of fatigue stress caused by the long-term operation of the bearing shaft, so that the fatigue strength and bearing capacity of the bearing shaft cannot meet the requirements. , which in turn leads to inaccurate selection of the bearing shaft.

Contents of the invention

In view of this, the present invention proposes a test device for a tensioner tailcar, aiming at solving the problem of inaccurate selection of the bearing shaft of the tensioner tailcar in the prior art.

The present invention proposes a test device for a tensioner tailcar, which comprises: a supporting device for supporting both ends of a bearing shaft in a tensioner tailcar; a loading device detachably connected to the bearing shaft for The bearing shaft exerts pressure; the pressure testing device is arranged on the loading device to detect the pressure on the bearing shaft.

Further, in the test device for the above-mentioned tension engine tailcar, the supporting device includes: a base and two supporting bodies; wherein, the first ends of the two supporting bodies are connected to the base, and there is a preset gap between the two supporting bodies. Distance; the two ends of the bearing shaft are respectively rotatably and detachably connected to the second ends of the two supporting bodies.

Further, in the test device of the above-mentioned tension tailcar, the loading device includes: a force applying device, a first connecting rod and a second connecting rod; wherein, the first connecting rod and the force applying device are respectively placed on both sides of the bearing shaft, The second connecting rod is placed above the bearing shaft, and the second connecting rod is provided with a connecting portion, and the bearing shaft is slidably passed through the connecting portion; the first end of the first connecting rod is connected with the base, and the first connecting rod The second end of the second connecting rod is hinged to the first end of the second connecting rod, the second end of the second connecting rod is hinged to the loading end of the force applying device, and the supporting seat of the force applying device is connected to the base; the pressure testing device is arranged on first connecting rod.

Further, in the above-mentioned test device for the tensioner tailcar, the connection part is an arc-shaped connection part.

Further, in the above-mentioned test device for the tension tailcar, the loading device further includes: a bearing; wherein, the bearing shaft is passed through the bearing, and the bearing is passed through the connecting portion of the second connecting rod.

Further, the above-mentioned test device for the tensioner tailcar also includes: a driving motor connected to the bearing shaft and used to drive the bearing shaft to rotate.

Further, in the above-mentioned test device for a tension tailcar, the first end of the first connecting rod is slidably connected to the base, and the support seat of the force applying device is slidably connected to the base.

Further, in the above-mentioned test device for the tension tailcar, the base is provided with two slide rails parallel to the bearing shaft, and the two slide rails are slidably connected to the first end of the first connecting rod and the support seat of the force applying device respectively. connected; the slide rail connected with the first end of the first connecting rod is provided with an anti-off mechanism, and the anti-off mechanism is used to prevent the first end of the first connecting rod from detaching from the slide rail when the first connecting rod moves upward.

Further, in the above-mentioned test device for the tension tailcar, there are two loading devices, and the two loading devices are arranged side by side along the axial direction of the bearing shaft.

In the present invention, the loading device applies pressure to the bearing shaft, and detects the deformation of the bearing shaft when the allowable load of the bearing shaft is reached, and then judges whether the strength of the bearing shaft meets the requirements according to the deformation of the bearing shaft, thereby ensuring that the bearing shaft Accurate matching makes the selected load-bearing shaft meet the performance requirements of the tension tail car, with a high safety factor, which improves the accuracy of the load-bearing shaft type selection, and solves the problem of the load-bearing shaft selection of the tension tail car in the prior art. The problem of inaccurate type avoids the excessive strength of the selected bearing shaft, and effectively reduces the weight and cost of the tension machine tail car.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is the structural representation of the test device of the tension machine tail car that the embodiment of the present invention provides;

Fig. 2 is the schematic diagram of the front view of the test device of the tensioner tail car provided by the embodiment of the present invention;

FIG. 3 is a schematic cross-sectional structure diagram of A-A in FIG. 2 .

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to Fig. 1 to Fig. 3, the preferred structure of the test device for the tension tailcar provided by the embodiment of the present invention is shown in the figures. As shown in the figure, the test device for the tension tailcar includes: a supporting device 1 , a loading device 2 and a pressure testing device 3 . Wherein, the supporting device 1 is used to support both ends of the bearing shaft 4 in the tensioner tail car, and the supporting device 1 is connected to the bearing shaft 4 in a rotatable and detachable manner. The loading device 2 is detachably connected to the bearing shaft 4 , and the loading device 2 is used for applying pressure to the bearing shaft 4 . The pressure testing device 3 is arranged on the loading device 2 , and the pressure testing device 3 is used to detect the pressure on the bearing shaft 4 . Specifically, the loading device 2 and the bearing shaft 4 may be rotatably connected, that is, although the loading device 2 exerts pressure on the bearing shaft 4 , the loading device 2 does not restrict the rotation of the bearing shaft 4 . During actual construction, the bearing shaft 4 is passed through the wire reel in the tail car of the tension machine, and the wire reel exerts pressure on the bearing shaft 4 . The loading device 2 simulates the actual working condition that the wire coil exerts pressure on the bearing shaft 4 .

During specific implementation, the test device can test the bearing shaft 4 when it is in a static state, and test whether the static strength of the bearing shaft 4 meets the preset requirements; the test device can also test the bearing shaft 4 when it is in a rotating state, and test the load bearing shaft. 4 Whether the fatigue strength meets the preset requirements. During specific implementation, the preset requirements for static strength and fatigue strength of each bearing shaft 4 can be found out according to relevant regulations.

During the test, both ends of the bearing shaft 4 are connected with the supporting device 1 . Each bearing shaft 4 has a design allowable load and a design allowable fatigue load. When the bearing shaft 4 is in a static state, the loading device 2 continuously applies pressure to the bearing shaft 4 according to the design allowable load until the pressure value detected by the pressure testing device 3 reaches the design allowable load, and detects the deformation of the bearing shaft 4 . If the bearing shaft 4 is not deformed, it means that the static strength of the bearing shaft 4 meets the preset requirements. If the bearing shaft 4 is deformed, the static strength of the bearing shaft 4 does not meet the preset requirements. When the bearing shaft 4 is in a rotating state, the loading device 2 continuously applies pressure to the bearing shaft 4 according to the design allowable fatigue load until the design allowable fatigue load is reached. At this time, keep the bearing shaft 4 rotating for a preset time and detect the bearing shaft 4 deformation. If the bearing shaft 4 is not deformed, it means that the fatigue strength of the bearing shaft meets the preset requirements. If the bearing shaft 4 is deformed, the fatigue strength of the bearing shaft 4 does not meet the preset requirements. During specific implementation, the preset time may be determined according to actual conditions, which is not limited in this embodiment.

During specific implementation, the selection process of the bearing shaft 4 is as follows: first, a bearing shaft 4 of a size is selected by static calculation, and then the selected bearing shaft 4 is tested by a test device to judge the static strength of the bearing shaft 4 and fatigue strength can meet the preset requirements, when the preset requirements are met, the selection of the bearing shaft 4 is successful; For a bearing shaft 4 of one size, repeat the above process until the selection of the bearing shaft 4 is successful. It should be noted that the bearing shaft 4 can be used only if the static strength and fatigue strength of the bearing shaft 4 meet the preset requirements, that is, the selection of the bearing shaft 4 is successful. As long as one of the static strength and fatigue strength of the bearing shaft 4 does not meet the preset requirements, the bearing shaft 4 cannot be used, that is, the selection of the bearing shaft 4 fails.

It can be seen that in this embodiment, the loading device 2 applies pressure to the bearing shaft 4, and detects the deformation of the bearing shaft 4 when the allowable load of the bearing shaft 4 is reached, and then judges the deformation of the bearing shaft according to the deformation of the bearing shaft. Whether the strength meets the requirements, and then ensure that the bearing shaft 4 is accurately selected, so that the selected bearing shaft 4 can meet the performance requirements of the tension machine tail car, the safety factor is high, and the accuracy of the selection of the bearing shaft 4 is improved. In the prior art, the problem of inaccurate selection of the bearing shaft of the tensioner tail car avoids the excessive strength of the selected bearing shaft, and effectively reduces the weight and cost of the tensioner tail car.

Referring to FIG. 1 to FIG. 3 , in the above embodiments, the supporting device 1 may include: a base 11 and two supporting bodies 12 . Wherein, the first ends (lower ends shown in FIG. 1 ) of the two supporting bodies 12 are both connected to the base 11 , and there is a preset distance between the two supporting bodies 12 . Both ends of the bearing shaft 4 are respectively rotatably and detachably connected to the second ends (upper ends shown in FIG. 1 ) of the two supporting bodies 12 . Specifically, the two support bodies 12 are perpendicular to the base 11 , the two support bodies 12 are placed above the base 11 (relative to FIG. 1 ), and the two support bodies 12 have a preset height. The second end of each support body 12 is provided with a bearing seat, and a bearing is arranged in the bearing seat. One end of the bearing shaft 4 is connected with the bearing at the second end of one of the support bodies 12, and the other end of the bearing shaft 4 is connected with the other end of the bearing shaft 4. The bearings at the second ends of the supporting bodies 12 are connected so that both ends of the bearing shaft 4 are rotatably and detachably connected to the second ends of the two supporting bodies 12 .

It should be noted that, during specific implementation, the preset distance between the two support bodies 12 can be set according to the actual situation, which is not limited in this embodiment. The preset height can be set according to the actual situation, which is not limited in this embodiment.

It can be seen that in this embodiment, by detachably connecting the two ends of the bearing shaft 4 with the second ends of the two supporting bodies 12 and being rotatable, the support of the supporting device 1 on the bearing shaft 4 is realized, which is convenient for the bearing shaft 4 Easy disassembly and installation, simple structure.

Referring to FIGS. 1 to 3 , in the above embodiments, the loading device 2 may include: a force applying device 21 , a first connecting rod 22 and a second connecting rod 23 . Wherein, the first connecting rod 22 and the force applying device 21 are respectively placed on both sides of the bearing shaft 4 (the left and right sides shown in FIG. 1 ), and the second connecting rod 23 is placed above the bearing shaft 4 (with respect to FIG. 1 ). Word). The second connecting rod 23 is provided with a connecting portion, and the carrying shaft 4 is slidably passed through the connecting portion.

Specifically, the connecting portion may be a sleeve, the inner wall of which is smooth, and the bearing shaft 4 is passed through the sleeve so that the bearing shaft 4 and the sleeve can slide relative to each other. The connecting portion can also be an arc-shaped connecting portion 231, that is, the arc-shaped connecting portion 231 is an arc-shaped protrusion provided on the second connecting rod 23, and the arc-shaped protrusion arches upward (relative to FIG. 1 ), Moreover, the inner wall surface of the arc-shaped connecting portion 231 is smooth, so that the bearing shaft 4 and the arc-shaped connecting portion 231 can slide relative to each other. Preferably, the connecting portion is an arc-shaped connecting portion 231 . More preferably, the arc of the arc-shaped connecting portion 231 matches the outer diameter of the bearing shaft 4 .

The first end (the lower end shown in FIG. 1 ) of the first connecting rod 22 is connected with the base 11, and the second end (the upper end shown in FIG. 1 ) of the first connecting rod 22 is connected with the first end of the second connecting rod 23 (left end shown in Figure 1) are hinged. The second end (the right end shown in Figure 1 ) of the second connecting rod 23 is hinged with the loading end (upper end shown in Figure 1 ) of the force applying device 21, and the supporting seat (the lower end shown in Figure 1 ) of the force applying device 21 ) is connected to the base 11. The pressure testing device 3 is disposed on the first connecting rod 22 . Specifically, the second end of the first connecting rod 22 is hingedly connected to the first end of the second connecting rod 23 and is detachably connected, and the second end of the second connecting rod 23 is hingedly connected to the loading end of the force applying device 21 And detachable connection. Preferably, the force applying device 21 may be a hydraulic cylinder.

During specific implementation, the first end of the second connecting rod 23 is provided with a through hole, and the through hole is arranged along the thickness direction of the second connecting rod 23 (up and down direction shown in FIG. The end passes through the through hole and is connected with the second connecting rod 23 by bolts. The second end of the second connecting rod 23 is provided with a through hole, which is arranged along the thickness direction of the second connecting rod 23 (the up-down direction shown in FIG. 1 ), and the loading end of the force applying device 21 is passed through the through hole hole and is connected with the second connecting rod 23 by bolts.

During the test, the force applying device 21 applies force gradually, and then the second end of the second connecting rod 23 is subjected to a downward pulling force, and then the first end of the second connecting rod 23 has a tendency to move upwards, but due to the second connecting rod The first end of 23 is connected with the base 11 by the first connecting rod 22, so the first end of the second connecting rod 23 is restricted, so that the first end of the second connecting rod 23 is also subjected to downward force, the second connecting rod 23 The first end of the rod 23 transmits the received force to the first connecting rod 22 , so that the bearing shaft 4 is subjected to the pressure exerted by the second connecting rod 23 . The pressure testing device 3 detects the force of the first connecting rod 22, that is, what the pressure testing device 3 detects is the force that the first end of the second connecting rod 23 is subjected to, and this force is equal to the second force applied by the force applying device 21 to the second connecting rod 23. The force applied by the end is also equal to 1/2 of the pressure on the bearing shaft 4, and the pressure on the bearing shaft 4 is equal to twice the force of the first connecting rod 22 detected by the pressure testing device 3.

It can be seen that in this embodiment, force is applied to one side of the bearing shaft 4 through the force applying device 21, and then the force actually borne by the bearing shaft 4 is determined according to the force detected by the pressure testing device 3, so as to facilitate the control of the bearing shaft 4. force, so as to better detect the deformation of the bearing shaft 4, and, since the two ends of the bearing shaft 4 are detachably connected to the second ends of the two supports 12, it is convenient to replace the bearing shaft 4, and can be used for different diameters The bearing shaft is tested, thereby improving the accuracy of the bearing shaft 4 test, and because the two ends of the second connecting rod 23 are hingedly connected with the first connecting rod 22 and the force applying device 21 respectively, so it can be according to the diameter of the bearing shaft 4 Change and replace the second connecting rod 23 to ensure the stable operation of the test device, and the structure is simple.

Referring to FIG. 1 to FIG. 3 , in the above embodiment, the loading device 2 may further include: a bearing 24 . Wherein, the bearing shaft 4 passes through the bearing 24 , and the bearing 24 passes through the connecting portion of the second connecting rod 23 . Since the two ends of the bearing shaft 4 are rotatably and detachably connected to the supporting body 12 respectively, the bearing 24 passes through the connecting part, and the bearing shaft 4 passes through the bearing 24, so the bearing shaft 4 can rotate relative to the connecting part. When the connecting portion is an arc-shaped connecting portion 231 , the bearing shaft 4 passes through the bearing 24 , and the arc-shaped connecting portion 231 of the second connecting rod 23 is correspondingly placed above the bearing 24 and in contact with the bearing 24 . During specific implementation, the bearing 24 is provided with a bearing seat, and the bearing seat passes through the connecting portion of the second connecting rod 23 .

The loading device 2 may also include: a driving motor. Wherein, the driving motor is connected to the bearing shaft 4, and the driving motor is used to drive the bearing shaft 4 to rotate. Specifically, the driving motor can be connected to the bearing shaft 4 through a coupling, a belt or a gear. Because the bearing shaft 4 is passed through the bearing 24, and the bearing 24 is passed through the connecting portion of the second connecting rod 23, and because the two ends of the bearing shaft 4 are also connected to the second ends of the two supporting bodies 12 through the bearing, that is Both ends of the bearing shaft 4 are rotatably connected to the second ends of the two supporting bodies 12, so the drive motor can provide power for the bearing shaft 4, so that the bearing shaft 4 can rotate.

During the test, the drive motor provides power for the load bearing shaft 4. Since the two ends of the load bearing shaft 4 are connected to the second ends of the two support bodies 12 through bearings, the load bearing shaft 4 passes through the connection between the bearing 24 and the second connecting rod 23. connected, so even if the bearing shaft 4 is subjected to the force exerted by the force applying device 21, the bearing shaft 4 can also rotate under the drive of the drive motor. The loading device 2 continuously exerts pressure on the bearing shaft 4 according to the design allowable fatigue load until the pressure value detected by the pressure testing device 3 reaches the design allowable fatigue load. Deformation of axis 4. If the bearing shaft 4 is not deformed, the fatigue strength of the bearing shaft 4 meets the preset requirements, which means that the bearing capacity of the bearing shaft 4 meets the requirements. If the bearing shaft 4 is deformed, the fatigue strength of the bearing shaft 4 does not meet the preset requirements, which means that the bearing capacity of the bearing shaft 4 is small, and the bearing shaft 4 cannot be used.

It can be seen that in this embodiment, by setting the bearing 24, when the force applying device 21 applies force to the bearing shaft 4 so that the bearing shaft 4 is under pressure, the bearing shaft 4 can also rotate, thereby realizing the improvement of the fatigue strength of the bearing shaft 4 The test, and according to whether the fatigue strength of the bearing shaft 4 meets the preset requirements, ensure the successful selection of the bearing shaft 4, which improves the accuracy of the selection of the bearing shaft 4.

In the above embodiments, the first end of the first connecting rod 22 is slidably connected to the base 11 , and the support seat of the force applying device 21 is slidably connected to the base 11 . In the actual operating conditions, the bearing shaft 4 is installed on the wire coil in the tension machine tail car. The size of the wire coil is also different with the different models of the wire coil. It is different, therefore, the first end of the first connecting rod 22 and the support seat of the force applying device 21 are all slidably connected with the base 11, so that the force applying device 21 can apply pressure to different positions of the bearing shaft 4, so that the test The device can test the strength at different positions of the bearing shaft, and can simulate the actual force applied to the bearing shaft 4 by different types of wire reels, so as to ensure that the type selection of the bearing shaft 4 is accurate.

Referring to FIG. 1 to FIG. 3 , in the above embodiment, the base 11 is provided with two slide rails 111 , and the two slide rails 111 are parallel to the bearing shaft 4 and placed on both sides of the bearing shaft 4 . The two slide rails 111 are slidably connected to the first end of the first connecting rod 22 and the support seat of the force applying device 21 respectively, that is to say, one of the slide rails 111 is slidably connected to the first end of the first connecting rod 22 The other slide rail 111 is slidably connected to the supporting seat of the force applying device 21 .

Specifically, the loading device 2 may further include: two sliders 25 . Wherein, the two sliding blocks 25 , the two sliding rails 111 , the first end of the first connecting rod 22 and the supporting seat of the force applying device 21 are all provided in one-to-one correspondence. That is to say, one of the sliders 25 is connected to the first end of the first connecting rod 22, and the slider 25 is placed in one of the slide rails 111; the other slider 25 is connected to the supporting base of the force applying device 21 , the slider 25 is placed in another slide rail 111 .

The slide rail 111 connected to the first end of the first connecting rod 22 is provided with an anti-off mechanism, which is used to prevent the first end of the first connecting rod 22 from detaching from the slide rail 111 when the first connecting rod 22 moves upward. To ensure that the first connecting rod 22 is connected with the base 11 through the slide rail 111, that is to say, when the force applying device 21 applies force, the second end of the second connecting rod 23 is subjected to a downward pulling force, and the second connecting rod 23 The first end of the second connecting rod 23 has a tendency to move upward. Since the first end of the second connecting rod 23 is connected to the first connecting rod 22, the first connecting rod 22 moves upward, and the anti-off mechanism prevents the first connecting rod 22 from moving upward to prevent The first connecting rod 22 breaks away from the slide rail. Specifically, the anti-off mechanism can set the slide rail 111 as a T-shaped slide rail 111, and correspondingly, the slide block 25 connected to the first end of the first connecting rod 22 is set as a T-shaped slide block. The anti-off mechanism can also set the slide rail 111 as a dovetail slide rail 111, and correspondingly, the slide block 25 connected to the first end of the first connecting rod 22 is set as a dovetail slide block.

During specific implementation, the slide rail 111 connected to the support seat of the force applying device 21 may also be provided with an anti-off mechanism. The anti-off mechanism can set the slide rail 111 as a T-shaped slide rail 111, and the slide block 25 connected to the support seat of the force applying device 21 is a T-shaped slide block.

It can be seen that in this embodiment, the base 11 is provided with two slide rails 111, which can make the loading device 2 slidable, thereby realizing the test of the strength of the bearing shaft 4 at different positions, thereby ensuring the selection of the bearing shaft 4 precise.

Referring to FIG. 1 to FIG. 3 , in the above-mentioned embodiments, there may be two loading devices 2 , and the two loading devices 2 are arranged side by side along the axial direction of the bearing shaft 4 . Specifically, the force applying device 21 in the two loading devices 2 can be arranged on one side of the bearing shaft 4 or on both sides of the bearing shaft 4 .

It can be seen that in this embodiment, by setting two loading devices 2, the actual working conditions of the tensioner tail car can be simulated, and the strength and fatigue strength of the bearing shaft 4 can be better tested, and the structure is simple and easy to implement.

To sum up, in this embodiment, the loading device 2 applies pressure to the bearing shaft 4, and detects the deformation of the bearing shaft 4 when the allowable load of the bearing shaft 4 is reached, and then judges the bearing shaft 4 according to the deformation of the bearing shaft. Whether the strength of the bearing meets the requirements, and then ensure that the bearing shaft 4 is accurately selected, so that the selected bearing shaft 4 can meet the performance requirements of the tension machine tail car, the safety factor is high, and the accuracy of the selection of the bearing shaft 4 is improved. The problem of inaccurate selection of the bearing shaft of the tensioner tail car in the prior art is solved, the excessive strength of the selected bearing shaft is avoided, and the weight and cost of the tensioner tail car are effectively reduced.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (9)

1. The utility model provides a test device of tensioner tail car which characterized in that includes:

the supporting device (1) is used for supporting two ends of a bearing shaft (4) in the tail car of the tension machine;

a loading device (2) detachably connected to the bearing shaft (4) for applying pressure to the bearing shaft (4);

and the pressure testing device (3) is arranged on the loading device (2) and is used for detecting the pressure born by the bearing shaft (4).

2. The test device of a tensioner tail car according to claim 1, characterized in that the support device (1) comprises: a base (11) and two supporting bodies (12); wherein,

the first ends of the two supporting bodies (12) are connected to the base (11), and a preset distance is reserved between the two supporting bodies (12);

two ends of the bearing shaft (4) are respectively connected with the second ends of the two supporting bodies (12) in a rotatable and detachable mode.

3. The test rig of a tensioner tail car according to claim 1, characterized in that the loading device (2) comprises: a force applying device (21), a first connecting rod (22) and a second connecting rod (23); wherein,

the first connecting rod (22) and the force applying device (21) are respectively arranged at two sides of the bearing shaft (4), the second connecting rod (23) is arranged above the bearing shaft (4), the second connecting rod (23) is provided with a connecting part, and the bearing shaft (4) is slidably arranged through the connecting part;

the first end of the first connecting rod (22) is connected with the base (11), the second end of the first connecting rod (22) is hinged with the first end of the second connecting rod (23), the second end of the second connecting rod (23) is hinged with the loading end of the force applying device (21), and the supporting seat of the force applying device (21) is connected with the base (11);

the pressure testing device (3) is arranged on the first connecting rod (22).

4. The test rig of a tensioner tail car as claimed in claim 3, wherein the connection is an arcuate connection (231).

5. The test rig of a tensioner tail car according to claim 3, characterized in that the loading device (2) further comprises: a bearing (24); wherein,

the bearing shaft (4) is arranged in the bearing (24) in a penetrating way, and the bearing (24) is arranged in a penetrating way at the connecting part of the second connecting rod (23).

6. The tensioner tail car test device of claim 5, further comprising:

and the driving motor is connected to the bearing shaft (4) and used for driving the bearing shaft (4) to rotate.

7. The load bearing shaft testing device according to claim 3, wherein a first end of said first connecting rod (22) is slidably connected to said base (11) and wherein a support seat of said force applying means (21) is slidably connected to said base (11).

8. The test rig of a tensioner tail car as set forth in claim 7,

the base (11) is provided with two sliding rails (111) parallel to the bearing shaft (4), and the two sliding rails (111) are respectively connected with the first end of the first connecting rod (22) and the supporting seat of the force applying device (21) in a sliding manner;

the slide rail (111) connected with the first end of the first connecting rod (22) is provided with an anti-falling mechanism, and the anti-falling mechanism is used for preventing the first end of the first connecting rod (22) from being separated from the slide rail when the first connecting rod (22) moves upwards.

9. The test rig of a tensioner tail pulley according to any one of claims 1 to 8, characterized in that the loading devices (2) are two, the two loading devices (2) being arranged side by side in the axial direction of the carrier shaft (4).