Railway vehicle weighing test bench online calibration device and method

Abstract

The application discloses a kind of rail vehicle weighing test bench online calibration device and method, it is related to weighing test bench calibration technical field, including connecting frame, the first pull rod is connected in connecting frame one side, and one second pull rod is connected in connecting frame both ends;The first pull rod bottom end is connected with pre-positioning mechanism, and the second pull rod is installed adjusting mechanism in one end connected with connecting frame;The adjusting mechanism is used to make the other end of second pull rod cooperate with weighing test bench, to cooperate with pre-positioning mechanism and straighten connecting frame;Force value sensor and hydraulic cylinder are sequentially installed in the bottom of connecting frame, and the hydraulic cylinder is used to abut on the upper side of weighing test bench, and can extrude force value sensor upwards.The application can improve the calibration accuracy and efficiency of weighing test bench.

Description

Technical Field

[0001] This invention relates to the field of weighing test bench calibration technology, and in particular to an online calibration device and method for a weighing test bench for rail vehicles. Background Technology

[0002] A rail vehicle weighing test bench is a device used to measure the mass of rail vehicles, typically used in rail transit systems such as trains or subways. To improve the accuracy of the weighing test bench, calibration is necessary. The traditional calibration process for rail vehicle weighing benches primarily involves manually operating hydraulic jacks to apply force simultaneously to a standard force gauge and the weighing units. A typical weighing bench has eight weighing units, requiring individual calibration sequentially. This process is not only time-consuming but also physically demanding for workers. Furthermore, manual pressure control is difficult and results in poor stability.

[0003] To address the issue of vehicle weighing test benches relying on manual operation, some automatic calibration devices have emerged in the prior art. For example, CN218211612U discloses a reaction force device for calibrating a dynamic weighing bench for high-speed trains, including a fixed bracket, a jack, a force gauge, and an upper pressure plate, which can perform regular and rapid verification and maintenance of the dynamic weighing bench for high-speed trains. Although the above solution can save calibration time to some extent, it is prone to problems such as jack misalignment and misalignment with the weighing test bench, affecting calibration accuracy. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an online calibration device and method for a rail vehicle weighing test bench, which can improve the calibration accuracy and efficiency of the weighing test bench.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides an online calibration device for a rail vehicle weighing test bench, comprising a connecting frame, wherein a first tie rod is connected to one side of the connecting frame, and a second tie rod is connected to each end of the connecting frame; the bottom end of the first tie rod is connected to a pre-positioning mechanism, and an adjustment mechanism is installed at the end of the second tie rod connected to the connecting frame; the adjustment mechanism is used to make the other end of the second tie rod cooperate with the weighing test bench to coordinate with the pre-positioning mechanism to align the connecting frame. A force sensor and a hydraulic cylinder are installed sequentially at the bottom of the connecting frame. The hydraulic cylinder is used to abut against the upper side of the weighing test bench and can press the force sensor upward.

[0006] As a further implementation, the adjustment mechanism includes an adjustment frame and a fixed shell, with one end of the adjustment frame fixed to the connecting frame and the other end connected to the fixed shell; The second pull rod is slidably connected to the adjusting frame, and the second pull rod is connected to the piston inside the fixed housing through the connecting rod. A first elastic element is connected between the piston and the fixed housing, and an oil control assembly is connected to the outside of the fixed housing.

[0007] As a further implementation, the oil control component includes an oil reservoir, which is connected to the fixed shell via a first connecting pipe and a second connecting pipe. A one-way valve is installed at the connection end between the first connecting pipe and the fixed shell, and a valve is installed at the connection end between the second connecting pipe and the fixed shell.

[0008] As a further implementation, a limiting mechanism is also included, which includes a connecting block and a limiting rod. The limiting rod is slidably connected to one end of the adjusting frame near the fixed shell, and the connecting block is connected to the second pull rod. The limiting rod can engage with the connecting block to limit the position of the second pull rod.

[0009] As a further implementation, one end of the limiting rod is connected to the adjusting frame via a second elastic element, and the other end is fixed with a limiting plate; the setting direction of the limiting rod is perpendicular to the movement direction of the second pull rod.

[0010] As a further implementation, the connecting block has a hook-shaped structure, and the end of the limiting rod has an inclined surface adapted to the connecting block.

[0011] As a further implementation, the pre-positioning mechanism includes a positioning frame and a support base. The positioning frame is connected to the first tie rod, and the support base is fixed to the lower side of the positioning frame. The support base is used to cooperate with the weighing test bench.

[0012] As a further implementation, the hydraulic cylinder is connected to a hydraulic control mechanism, which is electrically connected to a force sensor to regulate the working state of the hydraulic cylinder based on the value of the force sensor.

[0013] Secondly, the present invention also provides an online calibration method for a rail vehicle weighing test bench, employing the aforementioned online calibration device, comprising: The lower end of the first pull rod is engaged with the base of the weighing test bench through a pre-positioning mechanism to pre-position the connecting frame; The position of the second tie rod is changed by adjusting the mechanism so that the lower end of the second tie rod mates with the base of the weighing test bench, thus aligning the connecting frame. Start the hydraulic cylinder to press upwards against the force sensor to perform the weighing test bench calibration process.

[0014] As a further implementation, in the initial state, the valve of the hydraulic control component is in the closed state, the first elastic element is in the compressed state, the first connecting pipe, the second connecting pipe, the oil reservoir and the fixed shell are all filled with hydraulic oil, and the limit rod limits the initial position of the second pull rod. By pulling the limiting rod, it contacts the limiting position of the second pull rod, and the second pull rod moves under the action of the second elastic element and the oil control assembly to cooperate with the base of the weighing test bench.

[0015] As a further implementation, the force sensor moves upward with the extension and retraction end of the hydraulic cylinder, causing the connecting frame to drive the first and second tie rods to move upward until the mounting blocks at the lower ends of the first and second tie rods contact the base of the weighing test bench, thus fixing the first and second tie rods to the weighing test bench.

[0016] As a further implementation, the support seat in the pre-positioning mechanism is attached to the base of the weighing test bench so that the first pull rod corresponds to the limiting groove of the weighing test bench.

[0017] The beneficial effects of the present invention are as follows: (1) The present invention adopts a modular structure. Through the cooperation of the pre-positioning mechanism and the adjustment mechanism, the connecting frame can be aligned so that the hydraulic cylinder remains vertical, thereby improving the calibration accuracy of the weighing test bench. Furthermore, the position of the second tie rod is automatically positioned by a combination of hydraulic and elastic power, saving the time required for calibration of the weighing test bench. By setting up hydraulic cylinders and force sensors to calibrate the weighing test bench, the calibration accuracy and efficiency can be guaranteed under the premise that the connecting frame remains horizontal.

[0018] (2) The first tie rod and the two second tie rods of the present invention form a triangular distribution, so that the connecting frame is in a stable state; the bottom of the first tie rod is connected to the prepositioning mechanism, and the top of the second tie rod is connected to the adjustment mechanism, so that the connecting frame is straightened under the cooperative action of the prepositioning mechanism and the adjustment mechanism.

[0019] (3) The second tie rod connection adjustment mechanism of the present invention includes an elastic element and an oil control component. Under the action of the one-way valve, the hydraulic oil in the fixed shell cannot flow back to the oil storage shell along the connected first connecting pipe. Therefore, the hydraulic oil in the fixed shell is always full, thereby limiting the position of the two second tie rods and avoiding the position of the second tie rods from shifting during the calibration of the weighing test bench, which would cause the weighing test bench to calibrate incorrectly. At the same time, the limiting mechanism limits the initial position of the second tie rods to ensure the rapid coordination between the second tie rods and the weighing test bench. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a three-dimensional representation of the present invention according to one or more embodiments. Figure 1 ; Figure 2 This is a three-dimensional representation of the present invention according to one or more embodiments. Figure 2 ; Figure 3 This is a three-dimensional representation of the present invention according to one or more embodiments. Figure 3 ; Figure 4 This is a schematic diagram of the hydraulic control mechanism structure according to one or more embodiments of the present invention; Figure 5 This is a schematic diagram of the adjustment mechanism structure according to one or more embodiments of the present invention; Figure 6 This is a schematic diagram of the internal structure of the adjustment mechanism according to one or more embodiments of the present invention; Figure 7 This is a schematic diagram of the limiting mechanism structure according to one or more embodiments of the present invention; The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0022] The components include: 1. Weighing test bench; 2. First tie rod; 3. Second tie rod; 4. Connecting frame; 5. Force sensor; 6. Hydraulic cylinder; 7. Hydraulic control mechanism; 701. Housing; 702. Protective cover; 703. Controller; 704. Signal interface; 705. Hydraulic oil tank; 706. Valve block; 707. Servo motor; 708. Servo valve; 709. Pressure relief valve; 710. Oil pipe interface; 8. Adjusting frame; 9. Sliding part; 10. Fixed shell; 11. Piston; 12. Connecting rod; 13. First elastic element; 14. Oil reservoir; 15. Check valve; 16. First connecting pipe; 17. Valve; 18. Second connecting pipe; 19. Sealing ring; 20. Connecting block; 21. Fixed plate; 22. Limiting rod; 23. Limiting plate; 24. Second elastic element; 251. Positioning frame; 252. Support base. Detailed Implementation

[0023] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Example 1: This embodiment provides an online calibration device for a rail vehicle weighing test bench, such as... Figures 1-3 As shown, the weighing test bench 1 includes a first pull rod 2, a second pull rod 3, a connecting frame 4, and a hydraulic cylinder 6. Limiting grooves are provided on both the left and right sides of the base of the weighing test bench 1. These limiting grooves are respectively engaged with the bottom end of one of the second pull rods 3. A first pull rod 2 is located on the rear side of the base of the weighing test bench 1, and a pre-positioning mechanism connects the first pull rod 2 to the base of the weighing test bench 1. The first pull rod 2 and the two second pull rods 3 form a triangular positioning, and the top ends of the first pull rod 2 and the two second pull rods 3 are connected to the connecting frame 4.

[0025] In this embodiment, a limiting block and an installation block are sequentially installed at the bottom ends of the first pull rod 2 and the second pull rod 3, and a locking space with a limiting groove is formed between the limiting block and the installation block, thereby realizing the cooperation between the first pull rod 2, the second pull rod 3 and the base of the weighing test bench 1; the first pull rod 2 and the second pull rod 3 are moved up a certain distance so that the installation block contacts the base of the weighing test bench 1.

[0026] To accommodate the distribution of the first pull rod 2 and the second pull rod 3, the connecting frame 4 in this embodiment has a T-shaped structure. The first pull rod 2 is connected to the extended section in the middle of the connecting frame 4, and a second pull rod 3 is connected to each end of the connecting frame 4. The second pull rod 3 is connected to the connecting frame 4 through an adjustment mechanism, and the position of the second pull rod 3 is adjusted by the adjustment mechanism.

[0027] like Figure 2 As shown, a pre-positioning mechanism is connected to the lower end of the first pull rod 2 for aligning the connecting frame 4. The pre-positioning mechanism includes a positioning frame 251 and a support base 252. The positioning frame 251 is slidably connected to the lower part of the first pull rod 2. A limiting groove is provided at the lower part of the first pull rod 2. The positioning frame 251 slides in cooperation with the limiting groove of the first pull rod 2 to prevent relative rotation between the positioning frame 251 and the first pull rod 2. The positioning frame 251 is located below the limiting block of the first pull rod 2. The end of the first pull rod 2 passes through the positioning frame 251, and the mounting block at the end of the first pull rod 2 is located below the positioning frame 251. At this time, the mounting block at the lower end of the first pull rod 2 does not contact the base of the weighing test bench 1.

[0028] The shape of the positioning frame 251 can be set according to the actual situation. In this embodiment, the positioning frame 251 has an n-shaped structure, which facilitates the installation of the first pull rod 2. The bottom of the positioning frame 251 is fixed to the support base 252. The pre-positioning mechanism is installed by the support base 252 cooperating with the base of the weighing test bench 1. In order to adapt to the base structure of the weighing test bench 1, the support base 252 is provided with a stepped surface. The stepped surface cooperates with the base of the weighing test bench 1 to straighten the angle of the support base 252, so that the connecting frame 4 is straightened by adjusting the support base 252. Furthermore, the support base 252 and the base of the weighing test bench 1 are magnetically coupled to improve the stability of the first pull rod 2 and the connecting frame 4 on it.

[0029] like Figure 5 and Figure 6 As shown, the adjustment mechanism includes an adjustment frame 8 and a fixed housing 10. One end of the adjustment frame 8 is fixed to the connecting frame 4, and the other end is fixed to the fixed housing 10. The top end of the second pull rod 3 is slidably connected to the adjustment frame 8, so as to move along the adjustment frame 8 towards or away from the connecting frame 4. The second pull rod 3 and the adjustment frame 8 are connected by a slider. In this embodiment, the slider includes a sliding body sleeved on the outside of the second pull rod 3, and sliding members 9 provided on both sides of the sliding body. The adjustment frame 8 has a groove that cooperates with the sliding member 9, and the sliding member 9 can move left and right in the groove.

[0030] A piston 11 is housed within the fixed housing 10. One side of the piston 11 is connected to a connecting rod 12, which extends from the fixed housing 10 and passes through the adjusting bracket 8 to connect to the end of the second pull rod 3 furthest from the connecting bracket 4. A first elastic element 13 connects the other side of the piston 11 to the fixed housing 10. An oil control assembly is connected to the outside of the fixed housing 10, providing the oil required for the piston 11 to move. The first elastic element 13 cooperates with the oil control assembly to change the position of the piston 11. In this embodiment, the first elastic element 13 is configured as a spring.

[0031] In this embodiment, a sealing ring 19 is also installed on the outer periphery of the piston 11. The sealing ring 19 is made of elastic rubber material. The sealing ring 19 fits against the inner wall of the fixed shell 10 to increase the sealing between the piston 11 and the fixed shell 10, improve the stability of the piston 11, and prevent the piston 11 from shifting position after the second pull rod 3 is subjected to external force.

[0032] like Figure 6 As shown, the oil control assembly includes an oil reservoir 14, which is fixed to the adjusting frame 8 or the fixed housing 10 via a mounting base. The oil reservoir 14 is connected to a first connecting pipe 16 and a second connecting pipe 18. The first connecting pipe 16 is connected to the end of the fixed housing 10 away from the adjusting frame 8, and a one-way valve 15 is installed at the connection end between the first connecting pipe 16 and the fixed housing 10. The second connecting pipe 18 is connected to the side of the fixed housing 10, and a valve 17 is installed between the second connecting pipe 18 and the fixed housing 10.

[0033] The one-way valve 15 is used to control the flow direction of hydraulic oil in the first connecting pipe 16. Under the action of the one-way valve 15, the hydraulic oil in the oil reservoir 14 enters the fixed shell 10. Only when the valve 17 is opened can the hydraulic oil in the fixed shell 10 flow back to the oil reservoir 14. Therefore, the first connecting pipe 16 forms the oil inlet pipe and the second connecting pipe 18 forms the oil return pipe.

[0034] This embodiment also includes a limiting mechanism, which is used to limit the slider, such as... Figure 7As shown, the limiting mechanism includes a connecting block 20, a fixing plate 21, a limiting plate 23, and a second elastic element 24. The connecting block 20 is fixed to the slider or the second pull rod 3 on the side away from the connecting frame 4, and the connecting block 20 is hook-shaped. The fixing plate 21 is installed on one side of the adjusting frame 8 and is located at the end close to the fixed shell 10. The limiting rod 22 passes through the fixing plate 21 and can slide relative to the fixing plate 21. The axial direction of the limiting rod 22 is perpendicular to the extension and retraction direction of the piston 11.

[0035] One end of the limiting rod 22 has an inclined surface that matches the shape of the hook of the connecting block 20, facilitating the engagement between the connecting block 20 and the limiting rod 22. A limiting plate 23 is fixedly connected to one end of the limiting rod 22 facing the connecting block 20, and a second elastic element 24 is connected between the other end and the fixing plate 21. The second elastic element 24 is a tension spring used to reset the limiting rod 22. The limiting plate 23 engages with the limiting rod 22 to prevent it from detaching from the fixing plate 21. When the connecting block 20 moves outward, the inclined surface of the connecting block 20 presses against the limiting rod 22, causing the limiting rod 22 to slide along the fixing plate 21. The limiting rod 22 engages with the connecting block 20, thereby fixing the position of the slider and keeping the first elastic element 13 in a compressed state.

[0036] like Figures 1-3 As shown, a force sensor 5 is installed at the bottom center of the connecting frame 4. Positioning the force sensor 5 at the center of the connecting frame 4 prevents calibration errors in the weighing test bench 1 caused by positional deviation. A hydraulic cylinder 6 is installed below the force sensor 5, located on the upper side of the weighing test bench 1 and in compressive contact with it. During use, the hydraulic cylinder 6 is positioned on the upper side of the weighing test bench 1, and its extension end presses upwards, applying compressive force to the force sensor 5. The force sensor 5 detects the force between the hydraulic cylinder 6 and the connecting frame 4 in real time.

[0037] The hydraulic cylinder 6 is connected to the hydraulic control mechanism 7 via an oil guide pipe. The hydraulic control mechanism 7 is used to control the working state of the hydraulic cylinder 6. The hydraulic control mechanism 7 is connected to the control terminal via the Internet of Things and is electrically connected to the force sensor 5. The hydraulic control mechanism 7 can transmit the measured force value to the control terminal via the Internet of Things and adjust the working state of the hydraulic cylinder 6 by the feedback value from the force sensor 5.

[0038] like Figure 4As shown, the hydraulic control mechanism 7 includes a housing 701 and a protective cover 702. A protective cavity is formed between the protective cover 702 and the housing 701. The protective cavity is used to protect the electrical components inside, thereby improving the service life of the electrical components in the housing 701 and the protective cover 702. A controller 703 is installed on the protective cover 702, and a signal interface 704 is installed on the housing 701. The signal interface 704 is electrically connected to the controller 703 and also electrically connected to the force sensor 5. By inputting commands into the controller 703, the working state of the electrical components in the protective cavity is controlled.

[0039] A hydraulic oil tank 705 is installed inside the housing 701. The hydraulic oil tank 705 is used to store hydraulic oil. A valve block 706 is provided on the upper side of the hydraulic oil tank 705. A servo motor 707 is installed on the upper side of the valve block 706. The servo motor 707 is electrically connected to the controller 703. The output shaft of the servo motor 707 is connected to the valve block 706. When the output shaft of the servo motor 707 rotates, the valve block 706 drains the hydraulic oil in the hydraulic oil tank 705.

[0040] A servo valve 708 is installed on one side of the valve block 706, and a pressure relief valve 709 is installed on the other end. The servo valve 708 is used to adjust the output of the valve block 706. The servo valve 708 is electrically connected to the controller 703. Both the servo motor 707 and the servo valve 708 work according to the instructions input to the controller 703, thereby calibrating the weighing test bench 1. The housing 701 is equipped with an oil pipe interface 710, which is connected to the oil guide pipe of the hydraulic cylinder 6. The pressure relief valve 709 is connected to the oil pipe interface 710. The pressure relief valve 709 is used to relieve pressure on the valve block 706. After the pressure relief valve 709 is opened, the hydraulic oil in the hydraulic cylinder 6 returns to the hydraulic oil tank 705, so that the hydraulic cylinder 6 returns to its initial state.

[0041] This embodiment achieves the alignment of the connecting frame 4 through the cooperation of the pre-positioning mechanism and the adjustment mechanism, keeping the hydraulic cylinder 6 in a vertical state and improving the calibration accuracy of the weighing test bench; and the position of the second pull rod 3 is automatically positioned by a combination of hydraulic and elastic power, saving the time required for the calibration of the weighing test bench; by setting up hydraulic cylinders and force sensors to calibrate the weighing test bench, the calibration accuracy and efficiency can be guaranteed while keeping the connecting frame horizontal.

[0042] Example 2; This embodiment provides an online calibration method for a rail vehicle weighing test bench, using the device described in Embodiment 1, and includes the following steps: The support base 252 is attached to the base of the weighing test bench 1, and the stepped surface of the support base 252 mates with the base of the weighing test bench 1. The direction of the support base 252 is adjusted by the process of the stepped surface of the support base 252 mates with the base of the weighing test bench 1. Then, the first pull rod 2 is moved to the rear side of the weighing test bench 1, and the lower end of the first pull rod 2 mates with the positioning frame 251. The height of the first pull rod 2 is adjusted. Under the action of the positioning frame 251 and the support base 252, the connecting frame 4 is initially positioned. At this time, the force sensor 5 and the hydraulic cylinder 6 on the lower side of the connecting frame 4 are pressed against the upper side of the weighing test bench 1.

[0043] Initially, valve 17 is closed, connecting block 20 and limit rod 22 are in a limited engagement state, first elastic element 13 is compressed, and hydraulic oil is filled in first connecting pipe 16, second connecting pipe 18, oil tank 14, and fixed shell 10. Pulling limit rod 22 until limit plate 23 contacts fixed plate 21 stretches second elastic element 24, causing limit rod 22 and connecting block 20 to lose their limiting position. Under the elastic force of first elastic element 13, piston 11 moves; piston 11 drives connecting rod 12 to move, causing sliding element 9 to slide along adjusting frame 8. Sliding element 9 drives second pull rod 3 fixed to it to move closer to connecting frame 4. At this point, limit rod 22 is released, and under the elastic force of second elastic element 24, limit rod 22 returns to its original position.

[0044] As the pistons 11 on the left and right sides move closer together, the hydraulic oil in the oil tank 14 flows along the first connecting pipe 16 to the connected fixed shell 10. As the second pull rods 3 on both sides move closer together, the two second pull rods 3 move to the limiting grooves on the left and right sides of the base of the weighing test bench 1, respectively. The mounting block on the second pull rod 3 is located on the lower side of the limiting groove of the base of the weighing test bench 1, so that the connecting frame 4 remains horizontal as a whole.

[0045] During the calibration of the weighing test bench 1, the second pull rod 3 is subjected to an upward pulling force. At this time, under the action of the one-way valve 15, the hydraulic oil in the fixed shell 10 cannot flow back to the oil tank 14 along the connected first connecting pipe 16. Therefore, the hydraulic oil in the fixed shell 10 is always full, which limits the position of the two second pull rods 3 and prevents the position of the second pull rods 3 from shifting during the calibration of the weighing test bench 1, thus avoiding errors in the calibration of the weighing test bench 1. At the same time, during the calibration of the weighing test bench 1, the weight of the positioning frame 251 and the support seat 252 does not act on the first pull rod 2. Therefore, the positioning frame 251 and the support seat 252 cooperate with the base of the weighing test bench 1 to improve the accuracy of the cooperation between the pull rod and the limiting groove of the base of the weighing test bench 1.

[0046] When the weighing test bench 1 is calibrated, a command is input to the controller 703. The controller 703 then starts and controls the servo motor 707 and the servo valve 708, causing the servo motor 707 to run at a specified speed. At the same time, the servo valve 708 opens to a specified gap, causing the output shaft of the servo motor 707 to rotate. The valve block 706 drives the hydraulic oil in the hydraulic oil tank 705 to pass through the pressure relief valve 709 and the oil pipe interface 710 in sequence. Then, the hydraulic oil flows along the oil guide pipe into the hydraulic cylinder 6, causing the extension end of the hydraulic cylinder 6 to move upward. The extension end of the hydraulic cylinder 6 presses upward against the force sensor 5. The force sensor 5 moves upward with the extension end of the hydraulic cylinder 6, which in turn causes the connecting frame 4 to drive the first tie rod 2 and the second tie rod 3 to move upward until the mounting blocks at the lower ends of the first tie rod 2 and the second tie rod 3 contact the base of the weighing test bench 1.

[0047] As the extension end of the hydraulic cylinder 6 gradually moves upward, the compressive force on the force sensor 5 gradually increases. When the compressive force on the force sensor 5 reaches the preset value, the force value measured by the force sensor 5 is transmitted to the controller 703 through the signal interface 704. The controller 703 simultaneously transmits the data to the control terminal through the Internet of Things. The controller 703 controls the servo motor 707 to maintain its speed and supply oil, but keeps the force value measured by the force sensor 5 unchanged. The valve block 706 returns the excess hydraulic oil to the hydraulic oil tank 705, thereby keeping the hydraulic cylinder 6 in a pressure-holding state.

[0048] Subsequently, the data of the weighing test bench 1 is read, and then the controller 703 is input again. The controller 703 controls the servo motor 707 and the servo valve 708 according to the input instructions to repeat the above process, so that the hydraulic cylinder 6 enters the next stage of pressurization. The data measured by the load sensor on the weighing test bench 1 is read, and then the weighing test bench 1 is calibrated.

[0049] After the weighing test bench 1 is calibrated, the staff turns off the servo motor 707 and servo valve 708 through the controller 703. Then the staff opens the pressure relief valve 709, and the valve block 706 releases pressure, causing the oil in the hydraulic cylinder 6 to flow back into the hydraulic oil tank 705. The hydraulic cylinder 6 resets and releases the force applied to the force sensor 5, thus completing the calibration of the weighing test bench 1.

[0050] After the weighing test bench 1 is calibrated, the hydraulic cylinder 6 is reset. The valve 17 is opened, and the second pull rod 3 is pushed to both sides. The second pull rod 3 on both sides moves the sliding parts 9 connected to it away from the connecting frame 4. At this time, the connecting rod 12 moves the piston 11 connected to it. The piston 11 squeezes the hydraulic oil in the fixed shell 10, compressing the first elastic element 13. The hydraulic oil in the fixed shell 10, after being squeezed, flows through the valve 17 along the second connecting pipe 18 to the corresponding oil tank 14. The sliding part 9 moves the connecting block 20 towards the limiting rod 22. The inclined surface of the connecting block 20 presses against the inclined surface of the limiting rod 22, causing the limiting rod 22 to move forward along the fixed plate 21. Simultaneously, the second elastic element 24 is stretched again. When the piston 11 and the connecting rod 12 are reset, under the elastic force of the second elastic element 24, the limiting rod 22 resets and again engages with the connecting block 20. Then, the calibration device is removed from the base of the weighing test bench 1 for the next operation.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online calibration device for a rail vehicle weighing test bench, characterized in that, The system includes a connecting frame, with a first pull rod connected to one side and a second pull rod connected to each end. The bottom end of the first pull rod is connected to a pre-positioning mechanism, and an adjustment mechanism is installed at the end of the second pull rod connected to the connecting frame. The adjustment mechanism is used to make the other end of the second pull rod cooperate with the weighing test platform to coordinate with the pre-positioning mechanism to align the connecting frame. A force sensor and a hydraulic cylinder are installed sequentially at the bottom of the connecting frame. The hydraulic cylinder is used to abut against the upper side of the weighing test bench and can press the force sensor upward. The adjustment mechanism includes an adjustment frame and a fixed shell. One end of the adjustment frame is fixed to the connecting frame, and the other end is connected to the fixed shell. The second pull rod is slidably connected to the adjusting frame, and the second pull rod is connected to the piston inside the fixed housing through the connecting rod. A first elastic element is connected between the piston and the fixed housing, and an oil control assembly is connected to the outside of the fixed housing.

2. The online calibration device for a rail vehicle weighing test bench according to claim 1, characterized in that, The oil control assembly includes an oil storage tank, which is connected to the fixed shell via a first connecting pipe and a second connecting pipe. A one-way valve is installed at the connection end between the first connecting pipe and the fixed shell, and a valve is installed at the connection end between the second connecting pipe and the fixed shell.

3. The online calibration device for a rail vehicle weighing test bench according to claim 1, characterized in that, It also includes a limiting mechanism, which includes a connecting block and a limiting rod. The limiting rod is slidably connected to one end of the adjusting frame near the fixed shell, and the connecting block is connected to the second pull rod. The limiting rod can engage with the connecting block to limit the position of the second pull rod.

4. The online calibration device for a rail vehicle weighing test bench according to claim 3, characterized in that, One end of the limiting rod is connected to the adjusting frame via a second elastic element, and the other end is fixed with a limiting plate; the setting direction of the limiting rod is perpendicular to the movement direction of the second pull rod.

5. The online calibration device for a rail vehicle weighing test bench according to claim 3, characterized in that, The connecting block has a hook-shaped structure, and the end of the limiting rod has an inclined surface that is adapted to the connecting block.

6. The online calibration device for a rail vehicle weighing test bench according to claim 1, characterized in that, The pre-positioning mechanism includes a positioning frame and a support base. The positioning frame is connected to the first pull rod, and the support base is fixed to the lower side of the positioning frame and is used to cooperate with the weighing test bench.

7. The online calibration device for a rail vehicle weighing test bench according to claim 1, characterized in that, The hydraulic cylinder is connected to a hydraulic control mechanism, which is electrically connected to a force sensor to regulate the working state of the hydraulic cylinder based on the force sensor readings.

8. An online calibration method for a rail vehicle weighing test bench, characterized in that, The online calibration device as described in any one of claims 1-7 includes: The lower end of the first pull rod is engaged with the base of the weighing test bench through a pre-positioning mechanism to pre-position the connecting frame; The position of the second tie rod is changed by adjusting the mechanism so that the lower end of the second tie rod mates with the base of the weighing test bench, thus aligning the connecting frame. Start the hydraulic cylinder to press upwards against the force sensor to perform the weighing test bench calibration process.

9. The online calibration method for a rail vehicle weighing test bench according to claim 8, characterized in that, In the initial state, the valve of the hydraulic control component is closed, the first elastic element is compressed, the first connecting pipe, the second connecting pipe, the oil reservoir and the fixed shell are all filled with hydraulic oil, and the limit rod limits the initial position of the second pull rod. By pulling the limiting rod, it contacts the limiting position of the second pull rod, and the second pull rod moves under the action of the second elastic element and the oil control assembly to cooperate with the base of the weighing test bench.

10. The online calibration method for a rail vehicle weighing test bench according to claim 8, characterized in that, The force sensor moves upward with the extension and retraction end of the hydraulic cylinder, causing the connecting frame to drive the first and second tie rods upward until the mounting blocks at the lower ends of the first and second tie rods contact the base of the weighing test bench, thus fixing the first and second tie rods to the weighing test bench.

11. The online calibration method for a rail vehicle weighing test bench according to claim 8, characterized in that, The support seat in the pre-positioning mechanism is attached to the base of the weighing test bench so that the first pull rod corresponds to the limiting groove of the weighing test bench.

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