Weight structure for load test

Abstract

The utility model discloses a weight structure for load test, which relates to the technical field of load test, and comprises a weight car capable of moving along the horizontal direction, and the weight car comprises a car body and a push-pull part. According to the technical scheme provided by the utility model, the vehicle body and the push-and-pull part are combined for use, and the sum of the weight of the push-and-pull part and the weight of the vehicle body is equal to integral multiples of the weight of the standard weight block, so that multi-stage requirements on the weight of the weight during load test are met; the purposes of performing combined utilization in existing resources and reducing the test cost of a load test are achieved, the weights can be carried without a complex structure, the existing resources are reasonably utilized, the number of the standard weights can be replaced due to the fact that the weight is integral multiples, the number of the weights is reduced, follow-up material counting is facilitated, and the test efficiency is improved. The carrying activity of traditional weights is improved, and the combined push-pull activity of the weight car is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of load test, and particularly relates to a weight structure for load test. Background Art

[0002] With the development of society, the number of elevators in use is increasing. During the use of elevators, it is necessary to continuously inspect and test the load operation of elevators to meet the requirements of safe use. According to the balance coefficient test requirements in item A1.3.2 of TSG T7001-2023 "Rules for Elevator Supervision and Periodic Inspection", the balance coefficient of traction elevators should be between 0.40 and 0.50, or meet the design value of the manufacturing unit. The test method is to load the car with 30%, 40%, 45%, 50%, and 60% of the rated load respectively and run up and down the whole journey. When the car and the counterweight run to the same horizontal position, record the current value of the motor, draw the current-load curve, and determine the balance coefficient based on the intersection point of the up and down running curves. At the same time, according to the braking test requirements in item A1.3.12.2 of TSG T7001-2023 "Rules for Elevator Supervision and Periodic Inspection", when the car is loaded with 125% of the rated load weight and runs downward at the normal operating speed, cut off the power supply of the motor and the brake, and the brake should be able to stop the drive host from rotating. After the test, the car should have no obvious deformation or damage.

[0003] In elevator load tests, the currently commonly used weights are 25 kg per piece. When testing the elevator load, it takes a great deal of physical strength to carry these weights individually. Due to the limitation of handling, it is very difficult to increase the weight of the weights. Moreover, the rated load of elevators is generally an integer, such as 1000 kg, 1350 kg, 1500 kg, 1800 kg, etc. To cooperate with the test, the elevator load should also be an integer multiple of the weight of the weights. At the same time, there are also some non-standard elevators. To meet the design requirements, although their rated load is an integer, the values are irregular, such as 630 kg. When conducting a weight test on this elevator, the weights required are 30%, 40%, 45%, 50%, 60%, and 125% of the rated load. When the values are scattered, using only standard 25 kg weights, the difference between the actual value and the required test value is relatively large, and it is very difficult to meet the test requirements.

[0004] At present, in the elevator load test, 25 kg weights per piece are commonly used. The traditional load detection method is to manually carry and transport these traditional weight blocks to the car using an ordinary trailer for detection. However, the above detection method has certain defects. For example, when there are many weight pieces during the test, when pulling the weights with an ordinary trailer, after the trailer or forklift enters the car, in order not to affect the weight of the weights, the trailer or forklift needs to be pushed out of the car again. The round-trip process is cumbersome and time-consuming. During the test process and at the end of the test, it is also necessary to count the number of weights to ensure that the number of weights meets the test requirements and there is no shortage. A large number is likely to cause difficulties in counting.

[0005] In view of this, we propose a weight structure for load testing to solve the above problems. Utility Model Content

[0006] The main purpose of the present utility model is to provide a weight structure for load testing, aiming to provide a structure that can improve the handling of traditional weights and simplify the combined pushing and pulling activities of the weight cart.

[0007] To achieve the above object, the weight structure for load testing proposed by the present utility model includes a weight cart that can move horizontally. The weight cart includes:

[0008] A vehicle body for accommodating at least one standard weight block; and,

[0009] A pushing and pulling part connected to the vehicle body, and the sum of the weights of the pushing and pulling part and the vehicle body is an integer multiple of the weight of the standard weight block.

[0010] In one embodiment, the vehicle body and the pushing and pulling part are detachably connected.

[0011] In one embodiment, multiple vehicle bodies and multiple pushing and pulling parts are selected and combined to form a first load unit;

[0012] In the first load units with different loads, at least one of the number of vehicle bodies and the number of pushing and pulling parts is set differently.

[0013] In one embodiment, the weight structure for load testing further includes standard weight blocks provided on the vehicle body;

[0014] Multiple vehicle bodies, multiple pushing and pulling parts, and multiple standard weight blocks are selected and combined to form a second load unit;

[0015] In the second load units with different loads, at least one of the number of vehicle bodies, the number of pushing and pulling parts, and the number of standard weight blocks is set differently.

[0016] In one embodiment, the pushing and pulling part includes a push rod;

[0017] The push rod is integrally formed;

[0018] Both ends of the push rod penetrate into the interior of the vehicle body and are inserted into the vehicle body respectively.

[0019] In an embodiment, the vehicle body further includes a traveling part, and the traveling part is fixed along the thickness direction of the vehicle body so that the vehicle body travels.

[0020] In an embodiment, the traveling part includes a mounting frame, a roller and a pin;

[0021] The mounting frame is fixed at the four corners of one end of the vehicle body away from the pushing and pulling part. Both ends of the pin rotate between the opposite sides of the inner wall of the mounting frame, and the inner peripheral wall of the roller is fixed to the circumferential side of the pin.

[0022] In an embodiment, the vehicle body further includes at least one fixing part;

[0023] The fixing parts are arranged in parallel on both sides along the width direction of the vehicle body for placing the pushing and pulling part.

[0024] In an embodiment, the fixing part is a fixing base;

[0025] Opposite sides of the two fixing bases are respectively fixed to the middle positions on both sides of the vehicle body along its length direction.

[0026] In an embodiment, a clamping groove is formed at one end of the fixing base along its thickness direction, and the pushing and pulling part is adapted to the clamping groove.

[0027] By adopting the combination of the vehicle body and the pushing and pulling part in the technical solution of the present utility model, setting the sum of the weights of the pushing and pulling part and the vehicle body to be an integer multiple of the weight of the standard weight block can not only meet the multi-level requirements for the weight of the weights during the load test, but also achieve the combined utilization of the existing resources, reduce the test cost of the load test, realize the handling of the weights without a complex structure, rationally utilize the existing resources, and the setting of the weight as an integer multiple can replace the number of the standard weight pieces, reduce the number of weight blocks, which is beneficial to the subsequent material inventory, realize the improvement of the handling of the traditional weights, and simplify the combined pushing and pulling activities of the weight cart. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0029] Figure 1 A split three-dimensional view of an embodiment of the weight structure for load testing provided by the present invention;

[0030] Figure 2 A schematic plan view of the weight structure for load testing provided by the present invention without placing the standard weight block;

[0031] Figure 3 An assembled three-dimensional view of the weight structure for load testing provided by the present invention.

[0032] Explanation of the reference numerals in the drawings:

[0033] 1000, weight structure for load testing; 100, weight cart; 1, vehicle body; 2, pushing and pulling part; 21, push rod; 3, standard weight block; 4, first load unit; 5, second load unit; 6, traveling part; 61, roller; 62, pin; 63, mounting bracket; 7, fixing part; 71, fixing base; 711, card slot.

[0034] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] With the development of society, the number of elevators in use is increasing. During the use of elevators, it is necessary to continuously inspect and test the load operation of elevators to meet the requirements of safe use. According to the balance coefficient test requirements in item A1.3.2 of TSG T7001-2023 "Rules for Elevator Supervision Inspection and Periodic Inspection", the balance coefficient of traction elevators should be between 0.40 and 0.50, or meet the design value of the manufacturing unit. The inspection method is to load the car with 30%, 40%, 45%, 50%, and 60% of the rated load respectively and perform up and down full travel. When the car and the counterweight run to the same horizontal position, record the current value of the motor, draw the current-load curve, and determine the balance coefficient based on the intersection point of the up and down operation curves. At the same time, according to the braking test requirements in item A1.3.12.2 of TSG T7001-2023 "Rules for Elevator Supervision Inspection and Periodic Inspection", when the car is loaded with 125% of the rated load weight and runs downward at the normal operating speed, cut off the power supply of the motor and the brake, and the brake should be able to stop the drive host from running. After the test, the car should have no obvious deformation or damage.

[0039] Currently, in elevator load tests, 25 kg / unit weights are commonly used. The traditional load detection method is to manually carry and transport these traditional weight blocks to the car using an ordinary trailer. However, the above detection method still has certain defects. For example, when there are many weight pieces during the test, when pulling the weights with an ordinary trailer, after the trailer or forklift enters the car, in order not to affect the weight of the weights, the trailer or forklift needs to be pushed out of the car again. The round-trip process is cumbersome and time-consuming and laborious. During the test process and at the end of the test, it is also necessary to count the number of weights to ensure that the number of weights meets the test requirements and there is no shortage. A large number of weights is likely to cause difficulties in counting.

[0040] To solve the above problems, the present utility model proposes a weight structure for load testing, aiming to provide a structure that can improve the handling of traditional weights and simplify the combined push-pull activities of the weight trolley.

[0041] Please refer to Figures 1-3, in an embodiment of the present utility model, the load test weight structure is used for the load test of an elevator car. The load test weight structure 1000 includes a weight cart 100 that can move horizontally; the weight cart 100 includes a body 1 and a pushing and pulling part 2; the body 1 is used for placing at least one standard weight block 3, the pushing and pulling part 2 is connected to the body 1, and the sum of the weights of the pushing and pulling part 2 and the body 1 is an integer multiple of the weight of the standard weight block 3.

[0042] In the technical solution of the present utility model, the load test weight structure 1000 includes a weight cart 100 that can move horizontally; the weight cart 100 includes a body 1 and a pushing and pulling part 2; the body 1 is used for placing at least one standard weight block 3, the pushing and pulling part 2 is connected to the body 1, and the sum of the weights of the pushing and pulling part 2 and the body 1 is an integer multiple of the weight of the standard weight block 3; with this setting, the weights of the body 1 and the pushing and pulling part 2 can be combined and used as the standard weight block 3, meeting the multi-level requirements for the weight of the weights during the load test, and at the same time solving the problems of manual back-and-forth handling of traditional trailers and a large number of weights.

[0043] In some embodiments, the weight cart 100 can be an electric trolley, and the use cost of the electric trolley is relatively high. It is controlled by a controller to control the movement of the electric trolley, etc. In order to protect the normal use of the electric trolley, the random increase or decrease of weight is restricted. Although the electric trolley can reduce the manual back-and-forth handling to a certain extent, the subsequent use and maintenance costs are relatively high and the use method is also restricted, resulting in an increase in the overall test cost. Therefore, in this embodiment, by using the combination of the body 1 and the pushing and pulling part 2, setting the sum of the weights of the pushing and pulling part 2 and the body 1 to be an integer multiple of the weight of the standard weight block 3 can not only meet the multi-level requirements for the weight of the weights during the load test, but also achieve the combined utilization of existing resources, reduce the test cost of the load test, realize the handling of weights without a complex structure, reasonably utilize existing resources, and the setting of the integer multiple of the weight can replace the number of the standard weight pieces 3, reduce the number of weight blocks, which is beneficial to subsequent material inventory, realize the improvement of the handling of traditional weights, and simplify the combined pushing and pulling activities of the weight cart 100.

[0044] It should be expanded that, in this embodiment, the body 1 can be designed to be 15 kg, and the pushing and pulling part 2 is designed to be 10 kg, that is, the sum of the weights of the body 1 and the pushing and pulling part 2 is 25 kg, which is equivalent to the weight of one standard weight piece. The body 1 can accommodate 3 standard weight pieces of 25 kg each, and be combined into the required weights, such as 25 kg, 50 kg, 75 kg, 100 kg, etc., which can be quickly combined for handling.

[0045] Among them, the loaded weight car 100 has a full load of 100 kg.

[0046] Furthermore, the vehicle body 1 and the pushing and pulling part 2 are detachably connected. It can be understood that for some non-standard elevators, in order to meet the design requirements, although their rated load capacities are integers, the values are irregular, such as 630 kg. When this elevator conducts a weight test, the required weights of the weights are 30%, 40%, 45%, 50%, 60%, and 125% of the rated load capacity. When the values are scattered, using a single standard 25-kg weight results in a relatively large difference between the actual value and the required value for the test, making it difficult to meet the test requirements. In some embodiments, the vehicle body 1 and the pushing and pulling part 2 are fixedly installed, and the vehicle body 1 and the pushing and pulling part 2 are integrated, which cannot meet the requirement of hierarchical weight adjustment, increasing the difficulty of the test requirements. Therefore, in the technical solution of this embodiment, by separating the use of the vehicle body 1 and the pushing and pulling part 2 and setting the vehicle body 1 and the pushing and pulling part 2 to different weights for combination, the weight of the weight car 100 can be hierarchically adjusted to cope with the situation where the elevator load is non-standard and meet the test requirements.

[0047] Furthermore, multiple vehicle bodies 1 and multiple pushing and pulling parts 2 are selected and combined to form a first load unit 4; in the first load units 4 with different loads, at least one of the number of vehicle bodies 1 and the number of pushing and pulling parts 2 is set differently. It can be understood that in some embodiments, the vehicle body 1 and the pushing and pulling part 2 are set to the same number, and setting them to the same number easily results in a regular change in the combined weight and cannot cope with the irregular change in the load of non-standard elevators. Therefore, in the technical solution of this embodiment, by setting the number of vehicle bodies 1 and the number of pushing and pulling parts 2 to be different, the purpose of combined replacement use can be achieved during use, promptly coping with the actual load value of the elevator and improving the flexibility in increasing or decreasing the weight requirements during the test.

[0048] It should be added that in the test of non-standard elevators, weights with values such as 10 kg, 20 kg, 30 kg, 35 kg, 40 kg, 45 kg, etc. can be formed by combining the pushing and pulling parts 2 and the vehicle bodies 1 in multiple weight cars 100 to meet the test requirements.

[0049] Furthermore, the load test weight structure 1000 further includes a standard weight block 3 provided on the vehicle body 1; a plurality of the vehicle bodies 1, a plurality of the pushing and pulling parts 2, and a plurality of the standard weight blocks 3 are selected and combined to form a second load unit 5; in the second load units 5 with different loads, at least one of the number of the vehicle bodies 1, the number of the pushing and pulling parts 2, and the number of the standard weight blocks 3 is set differently. It can be understood that, in some embodiments, the composed load units are fixed, and the weight can only be increased or decreased by increasing or decreasing the number of load units. When the fixed load unit is too large or too small, for those irregular numerical requirements, numerical differences are formed, and it is rather troublesome to exchange, and even a situation where exchange is impossible may occur. Therefore, in this embodiment, by setting the number of the vehicle body 1, the pushing and pulling part 2, and the standard weight block 3 differently, the weight vehicle 100 can obtain combinations of various combined weights, not limited to the self-calibrated weight of the load unit, thus realizing various weight combinations, meeting the multi-level requirements for the weight of the weights, and improving the test efficiency.

[0050] In addition, the pushing and pulling part 2 includes a push rod 21; the push rod 21 is integrally formed; both ends of the push rod 21 penetrate into the interior of the vehicle body 1 and are inserted into the vehicle body 1. Among them, the push rod 21 is perpendicular to the vehicle body 1. It can be understood that, in some embodiments, the push rod 21 and the vehicle body 1 may be threadedly connected. Although the threaded connection can be disassembled, it is not applicable to the connection between the vehicle body 1 and the push rod 21 in this embodiment, and the threaded connection also requires tapping the vehicle body, increasing the process. Therefore, in this embodiment, by integrally forming the push rod 21, the push rod 21 can be directly inserted into the vehicle body 1 for use when pushing and pulling the weight vehicle 100, with convenient and fast operation and no additional processing process.

[0051] It should be explained that the materials selected for the vehicle body 1 and the push rod 21 are Q235A, whose yield strength is 235 Mpa and tensile strength is 375 Mpa, meeting the single compressive stress and tensile stress.

[0052] In addition, the vehicle body 1 further includes a traveling part 6, and the traveling part 6 is fixed along the thickness direction of the vehicle body 1 to enable the vehicle body 1 to travel. In the technical solution of this embodiment, through the arrangement of the traveling part 6, when pushing and pulling the weight vehicle 100, the force in the vertical direction can be shared by the traveling part 6.

[0053] Further, the walking part 6 includes a mounting frame 63, rollers 61 and pins 62; the mounting frame 63 is fixed at the four corners of the end of the vehicle body 1 away from the pushing and pulling part 2, both ends of the pin 62 are rotatable between the opposite sides of the inner wall of the mounting frame 63, and the inner peripheral wall of the roller 61 is fixed to the circumferential side surface of the pin 62. It can be understood that in some embodiments, the roller 61 is a plastic roller, but plastic rollers are generally suitable for light-load applications and cannot be used in the tests of this embodiment. Therefore, the technical solution of this embodiment adopts the cooperation of the roller 61 and the pin 62. Among them, the material of the roller 61 is selected from the commonly used material aluminum alloy 6063 on the market, and the material of the pin 62 is selected as 20 steel. When pushing and pulling the trolley, the force in the vertical direction is concentrated in the roller 61 and the pin 62 that cooperates with it. The pin 62 mainly bears shear stress, and the roller 61 bears compressive stress. It can well meet the strength requirements, and at the same time has the characteristics of wear resistance and compression resistance, is not easily damaged, and the materials are easy to obtain.

[0054] It should be explained that when the allowable extrusion stress 「б」 of the roller 61 = 130 Mpa, the width of the roller 61 is set to 40 mm, and the large and small diameters of the roller 61 are set to 80 mm. Considering extreme conditions, when a weight of 100 kg acts entirely on the same roller 61, the maximum extrusion stress acting on the cross-section of the roller 61 is б = F / S = 100×9.8 N / (20×40×) = 4.9 Mpa. This result is much smaller than the allowable extrusion stress 「б」, so the roller 61 meets the strength requirements; the allowable shear stress 「τ」 of the pin 62 = 30 MPa, and the diameter is selected as 20 mm. Considering extreme conditions, when a weight of 100 kg acts entirely on one side of the pin 62, the maximum shear stress acting on the cross-section of the pin 62 is τ = 100×9.8 N / 2×(20×m) = 3.12×Pa. This result is much smaller than the allowable shear stress 「τ」, so the pin 62 meets the strength requirements.

[0055] Among them, the material of the roller 61 is selected as aluminum alloy 6063. In the T5 processing state, its tensile strength can reach 175 Mpa, and the Brinell hardness is 64 Hba, which can make the roller 61 roll and rub on the ground, and ensure no deformation and damage under long-term use, and has the characteristics of wear resistance and compression resistance.

[0056] In addition, the vehicle body 1 further includes at least one fixing part 7; the fixing parts 7 are arranged in parallel on both sides of the vehicle body 1 in the width direction for placing the pushing and pulling part 2. In the technical solution of this embodiment, the setting of the fixing part 7 not only facilitates the installation of the push rod 21, but also is beneficial for the user to lift the vehicle body of the weight car 100 and provides a force-bearing position for the user.

[0057] Further, the fixing part 7 is a fixing base 71; opposite sides of the two fixing bases 71 are respectively fixed to the middle positions on both sides of the vehicle body 1 along its length direction. It can be understood that in some embodiments, the fixing base 71 is lacking, and instead, the push rod 21 is directly inserted into the vehicle body 1 for use. Although the installation effect can be achieved, when it is necessary to carry the weight carrier 100, it is not easy to grasp the force-bearing position, resulting in difficult handling. Therefore, in this embodiment, by adopting the fixing base 71, the fixing base 71 is fixed to the middle positions on both sides of the vehicle body 1 along its length direction, so that the forces received by the push rod 21 during pushing and pulling are balanced, ensuring the stable pushing of the weight carrier 100; when pushing and pulling the weight carrier 100, the push rod 21 can be inserted into the fixing base 71 to achieve pushing; at the same time, when it is necessary to lift the vehicle body 1 of the weight carrier 100, the hand can be placed at the bottom of the fixing base 71, and its position is convenient for bearing force, enabling good handling.

[0058] Further, a slot 711 is formed at one end of the fixing base 71 along its thickness direction, and the pushing and pulling part 2 is adapted to the slot 711. It can be understood that in some embodiments, the installation methods for fixing the pushing and pulling part 2 include snap structures, locking structures, etc. Most of these installation methods require additional structures to be used in cooperation, thus increasing the burden on the vehicle body 1, and the weights of these structures are usually not regular in value, further increasing the difficulty in selecting the weight of the vehicle body 1. Therefore, the technical solution in this embodiment directly forms the slot 711 for placing the pushing and pulling part 2, without the need to additionally pair corresponding installation structures for use, making it simple and easy to select the weight of the vehicle body 1.

[0059] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A weight structure for load testing, characterized in that, Comprising a weight carriage capable of moving horizontally, the weight carriage includes: A vehicle body for placing at least one standard weight block; A pushing and pulling part connected to the vehicle body, the sum of the weights of the pushing and pulling part and the vehicle body being an integer multiple of the weight of the standard weight block; The vehicle body and the pushing and pulling part are detachably connected; and, The weight structure for load testing further includes a standard weight block provided on the vehicle body; Selecting a combination of a plurality of the vehicle bodies, a plurality of the pushing and pulling parts, and a plurality of the standard weight blocks to form a second load unit; In the second load units with different loads, at least one of the number of the vehicle bodies, the number of the pushing and pulling parts, and the number of the standard weight blocks is set differently.

2. The weight structure for load testing according to claim 1, characterized in that, Selecting a combination of a plurality of the vehicle bodies and a plurality of the pushing and pulling parts to form a first load unit; In the first load units with different loads, at least one of the number of the vehicle bodies and the number of the pushing and pulling parts is set differently.

3. The load test weight structure according to claim 1, characterized in that, The pushing and pulling part includes a push rod; The push rod is integrally formed; Both ends of the push rod respectively penetrate into the interior of the vehicle body and are inserted into the vehicle body.

4. The weight structure for load testing according to claim 1, characterized in that, The vehicle body further includes a traveling part, and the traveling part is fixed along the thickness direction of the vehicle body so that the vehicle body can travel.

5. The load test weight structure according to claim 4, characterized in that, The traveling part includes a mounting bracket, a roller, and a pin; The mounting brackets are fixed at the four corners of one end of the vehicle body away from the pushing and pulling part, both ends of the pin rotate between the opposite sides of the inner wall of the mounting bracket, and the inner peripheral wall of the roller is fixed to the circumferential side of the pin.

6. The weight structure for load testing according to claim 1, characterized in that, The vehicle body further includes at least one fixing part; The fixing parts are arranged in parallel on both sides in the width direction of the vehicle body for placing the pushing and pulling part.

7. The load test weight structure according to claim 6, characterized in that, The fixing part is a fixing base; Opposite sides of the two fixing bases are respectively fixed to the middle positions on both sides of the vehicle body along its length direction.

8. The weight structure for load testing according to claim 7, wherein, A slot is formed at one end of the fixing base along its thickness direction, and the pushing and pulling part is adapted to the slot.

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