CN215640179U - Auxiliary device for adjusting height of tie spring of bogie - Google Patents
Auxiliary device for adjusting height of tie spring of bogie Download PDFInfo
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- CN215640179U CN215640179U CN202122203971.4U CN202122203971U CN215640179U CN 215640179 U CN215640179 U CN 215640179U CN 202122203971 U CN202122203971 U CN 202122203971U CN 215640179 U CN215640179 U CN 215640179U
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- bogie
- cushion block
- tie
- height adjustment
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Abstract
The utility model relates to a height adjustment auxiliary device for a tie spring of a bogie, which comprises a suspension rod and a jacking device sleeved on the suspension rod, wherein the suspension rod is at least provided with external threads at the upper end and the lower end, the lower end of the suspension rod is in screwed connection with a lower clamping plate of a tie axle box spring, a locking nut is arranged at the upper end of the suspension rod, the jacking device is in contact with the locking nut during operation, and the jacking device drives the suspension rod and the lower clamping plate to lift through the locking nut. The utility model has simpler integral structure and more convenient and safer operation, and can complete the increase and decrease adjustment operation of the adjusting cushion block by 2 persons, thereby being beneficial to improving the operation efficiency and reducing the personnel cost and the material cost.
Description
Technical Field
The utility model relates to a railway vehicle performance test device, in particular to a primary spring height adjusting auxiliary device for adjusting the height of a primary axle box spring of a bogie after a railway vehicle turns.
Background
A spring of the motor train unit is an important component of the bogie, and determines the stability and safety of the motor train unit during operation. According to the design requirements of the railway vehicle, the whole railway vehicle needs to be weighed after final assembly, and the national standard provides that the wheel weight difference of the same wheel pair of the railway vehicle does not exceed 4 percent so as to ensure the stability of the operation of the motor train unit. When the wheel weight difference exceeds a standard range, the height of a first series spring and a second series air spring of the bogie needs to be adjusted to meet the balance requirement of the vehicle, wherein the height of the first series spring is adjusted by increasing or decreasing the adjusting cushion block below the axle box spring so as to ensure that four axle box springs of the same bogie are on the same plane.
The existing method for adjusting the height of a spring is only carried out by lifting a vehicle, and the method has the following defects: firstly, 6 persons are needed to complete the vehicle lifting, which causes waste of the persons and is unsafe; secondly, the frame and the axle box spring need to be lifted repeatedly to complete the operation of adding and subtracting the adjusting pad, and the operation time is long; thirdly, the vehicle lifting process is repeatedly disassembled and assembled, so that part of fasteners are scrapped, and the traditional process is time-consuming and labor-consuming for adjusting a series of springs.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the technical problem of providing the auxiliary device for adjusting the height of the tie spring of the bogie, which has simple structure, convenient and safe operation, can greatly improve the operation efficiency and is beneficial to reducing the operation cost.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides a bogie is axle box spring height adjustment auxiliary device, includes jib and the jacking device of suit on the jib, the jib has the external screw thread section at upper end and lower extreme at least, the lower extreme of jib is screwed with the lower plate of a series of spring and is connected lock nut is installed to the upper end of jib, the jacking device contacts with lock nut when the operation, the jacking device passes through lock nut and drives jib and lower plate lift.
Further, the middle section of jib is smooth rod, jacking device has central through-hole, be clearance fit between jib and the central through-hole of jacking device.
Furthermore, an auxiliary supporting cushion block is arranged on the upper clamping plate of the series spring, and the bottom of the jacking device is arranged on the auxiliary supporting cushion block.
Furthermore, the auxiliary supporting cushion block is provided with a center through hole for penetrating through the suspension rod, a downward convex positioning bulge is arranged on the center through hole on the upper surface of the auxiliary supporting cushion block, and the positioning bulge is matched with the guide cylinder at the center of the upper clamping plate to realize the radial positioning of the auxiliary supporting cushion block.
Further, the positioning bulges are multiple and are arranged on a concentric circle in an interrupted mode; or the positioning bulge is of a continuous annular structure and is embedded into the technical hole of the guide cylinder or is clamped and sleeved on the periphery of the guide cylinder.
Furthermore, the auxiliary supporting cushion block is disc-shaped, and the positioning protrusions are arranged along the peripheral edge of the auxiliary supporting cushion block.
Further, the height of the positioning protrusion is at least 5 mm.
Furthermore, the diameter of the central through hole of the auxiliary supporting cushion block is matched with that of the suspender, and the suspender is in clearance fit with the central through hole.
Furthermore, a handle is detachably mounted at the top end of the hanging rod.
Further, the jacking device is a hydraulic pump and a hydraulic device, the hydraulic pump is sleeved on the suspender, and the hydraulic pump is connected with the hydraulic device through a pipeline.
In summary, compared with the prior art, the auxiliary device for adjusting the height of the tie spring of the bogie has the following advantages:
(1) the device can be after the vehicle falls off, under the condition that need not lift the car, promote the lower plate that the jib can drive a series of spring through operation jacking device and rise, make middle spring compression, with a series of spring and the temporary separation of adjustment cushion, reserve the operating space of adjustment cushion to accomplish the increase and decrease operation of adjustment cushion, can promote the operating efficiency by a wide margin.
(2) The device is with the direct suit of jacking device on the jib, when utilizing lock nut to adjust jib mounted position, still utilizes lock nut as jacking device's bearing structure, makes the device's overall structure simpler, and the operation is also convenient safety more, and 2 individual cooperations can accomplish the increase and decrease adjustment operation of adjustment cushion, not only are favorable to promoting the operating efficiency, still are favorable to reducing personnel's cost and material cost.
(3) The device installs supplementary bolster between the punch-out equipment and the punch holder of a series of spring, and supplementary bolster not only can play support and fixed action to the lift of punch-out equipment, also is used for covering and protecting a series of spring punch holder simultaneously, avoids the punch holder atress damage when the operation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model, are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model without limiting the utility model to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of the assembled structure of the auxiliary device of the present invention;
FIG. 2 is a schematic view of a boom construction of the present invention;
FIG. 3 is a schematic view of the cage nut of FIG. 2;
FIG. 4 is a schematic view of the positioning block of the present invention;
fig. 5 is a top view of fig. 4.
As shown in fig. 1 to 5, the axle box 1, a tie spring 2, an upper clamp plate 21, a lower clamp plate 22, a spring 23, a guide cylinder 24, a fabrication hole 25, an adjusting cushion block 3, a suspension rod 4, a jacking device 5, a hydraulic pump 51, an upper end thread section 6, a lower end thread section 7, a locking nut 8, a nut 81, a gasket 82, an auxiliary supporting cushion block 9, a center through hole 10, a positioning protrusion 11, a groove 12, a handle 13 and an internal thread hole 14.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the present invention provides an auxiliary device for adjusting the height of a tie spring of a bogie, wherein the tie spring 2 is an axle box spring installed between a wheel set and a frame, and has the functions of transmitting the acting force of a vehicle in the vertical direction, the longitudinal direction and the transverse direction, damping vibration, reducing noise, uniformly distributing vertical load, etc. A tie spring 2 is mounted above the axle housing 1, and in some models is mounted on a spring mount (not shown). An adjusting cushion block 3 is arranged between the bottom of a series of springs 2 and the top of the axle box body 1, and the height of the adjusting cushion block 3 is determined according to the wheel weight difference, so that the wheel weight difference is ensured to meet the requirements of national standard regulations.
The spring system 2 comprises an upper clamping plate 21, a lower clamping plate 22 and a spring 23 arranged between the upper clamping plate 21 and the lower clamping plate 22, wherein the spring 23 is a single steel round spring or a double steel round spring. The center of the upper clamping plate 21 is provided with a guide cylinder 24, the guide cylinder 24 protrudes upwards from the upper surface of the upper clamping plate 21, the guide cylinder 24 extends downwards into the spring 23, and the guide cylinder 24 and the upper clamping plate 21 are integrally formed. The lower clamping plate 22 is of an inverted T-shaped structure, the center of the inverted T-shaped lower clamping plate 22 extends upwards into the spring 23, and the adjusting cushion block 3 is installed below the lower clamping plate 22. The guide cylinder 24 of the upper clamping plate 21 and the center of the lower clamping plate 22 are both provided with a through fabrication hole 25, wherein the fabrication hole 25 on the lower clamping plate 22 is an internal thread hole.
The auxiliary device is used for lifting a lower clamping plate 22 in a series of springs 2 and compressing a middle spring 23 during operation, so that the bottom of the series of springs 2 is temporarily separated from the top of a shaft box body 1, an operation space for increasing and decreasing adjustment cushion blocks 3 is reserved between the bottom of the series of springs 2 and the top of the shaft box body 1, an operator adjusts and replaces corresponding adjustment cushion blocks 3 according to the requirements of design standards, and after adjustment is completed, the series of springs 2 are restored to the original state, namely the state during normal operation of a vehicle.
As shown in fig. 1, 2 and 3, the auxiliary device includes a boom 4 and a lifting device 5, the lifting device 5 is used to lift the boom 4 during operation, and simultaneously drives the lower clamp plate 22 to rise, thereby compressing the middle spring 23. The jacking device 5 comprises a hydraulic pump 51 and a hydraulic device (not shown in the figure), wherein the hydraulic pump 51 is sleeved on the boom 4, the hydraulic pump 51 is connected with the hydraulic device through a pipeline, and an operator can drive the output end of the hydraulic pump 51 to lift by operating a handle of the hydraulic device.
In this embodiment, the jacking device 5 is directly sleeved on the suspension rod 4 to simplify the overall structure of the device. Wherein, the jib 4 is provided with the screw thread section at least at upper end and lower extreme, and upper end screw thread section 6 and lower extreme screw thread section 7 are the external screw thread, through the threaded connection of screwing of screw thread between the lower extreme screw thread section 7 of jib 4 and the fabrication hole 25 of lower plate 22, installs lock nut 8 on the upper end screw thread section 6 of jib 4, and lock nut 8 can adjust its mounting height at will according to the demand. The locking nut 8 is composed of a nut 81 and a gasket 82, the output end of the jacking device 5 is in contact with the gasket 82 of the locking nut 8 during operation, the gasket 82 of the locking nut 8 is used as a bearing structure of the jacking device 5, the gasket 82 can increase the contact area between the output end of the jacking device 5 and the locking nut 8, and the locking nut 8 is guaranteed to be stressed uniformly. When the output end of the jacking device 5 extends upwards, the locking nut 8 is jacked together, the locking nut 8 drives the suspender 4 to move upwards synchronously, the suspender 4 drives the lower clamping plate 22 to move upwards synchronously, and then the middle spring 23 is compressed. After the adjustment of the adjusting cushion block 3 is completed, the output end of the jacking device 5 retracts downwards, so that the suspension rod 4 and the lower clamping plate 22 fall down, the spring 23 restores to the original state, and the compression of the spring 23 in the series of springs 2 before the adjustment and the restoration after the adjustment are further realized.
The diameters of the upper section, the middle section and the lower section of the suspender 4 can be the same or different, and are determined according to the diameters of central through holes of parts to be connected with different sections. In this embodiment, the middle section of jib 4 is smooth pole, jacking device 5's hydraulic pump 51 has central through-hole (not marking in the figure), the diameter of jib 4 and the diameter phase-match of hydraulic pump 51's central through-hole, be clearance fit between jib 4 and hydraulic pump 51's central through-hole, be used for guaranteeing jib 4 and the coincidence of hydraulic pump 51 the central axis, it is more even to make lock nut 8 atress, ensure that jib 4 and lower plate 22 steadily rise and descend, it is even to also ensure that the space that a series of spring 2 below is used for installing adjustment cushion 3, and then guarantee operating quality and efficiency.
As shown in fig. 1, 4 and 5, in the present embodiment, it is further preferable that an auxiliary shoe 9 is installed between the bottom of the jacking device 5 and the top of the upper clamp plate 21 of the spring system 2, the hydraulic pump 51 in the jacking device 5 is placed on the auxiliary shoe 9, and the auxiliary shoe 9 is used for covering and protecting the guide cylinder 24 of the upper clamp plate 21, and also plays a role of supporting and fixing the hydraulic pump 51 above.
As shown in fig. 4 and 5, the auxiliary lip block 9 has a center through hole 10 for passing through the suspension lever 4, and the auxiliary lip block 9 preferably has a disk-shaped structure with a flat upper surface, but may have other shapes such as a square shape. More preferably, the diameter of the central through hole 10 of the auxiliary supporting cushion block 9 is matched with the diameter of the corresponding section of the suspender 4, and the suspender 4 is in clearance fit with the central through hole 10, so that the central axes of the suspender and the series spring 2 are coincident, the operation quality is ensured, and the upper clamping plate 21 is prevented from being damaged by stress during operation.
In this embodiment, preferably, the center of the contour through hole 10 on the lower surface of the auxiliary supporting cushion block 9 has a positioning protrusion 11 protruding downward, more preferably, the positioning protrusion 11 is a continuous annular structure, and the annular positioning protrusion 11 is disposed along the peripheral edge of the auxiliary supporting cushion block 9, so that the auxiliary supporting cushion block 9 integrally forms an integral structure with a circular groove 12 on the lower surface, the diameter of the groove 12 matches with the outer diameter of the guide cylinder 24, so that the positioning protrusion 11 is mounted on the periphery of the guide cylinder 24 in a clamping manner, i.e., the top of the guide cylinder 24 is just clamped in the groove 12, and the radial positioning of the auxiliary supporting cushion block 9 is realized by utilizing the cooperation between the positioning protrusion 11 and the guide cylinder 24, which is beneficial to avoiding the upper clamp plate 21 from being damaged by stress during operation, and is also beneficial to stably supporting and fixing the lifting of the hydraulic pump 51. Of course, the outer diameter of the annular positioning protrusion 11 may also be smaller than the inner diameter of the fabrication hole 25 of the guide cylinder 24, the positioning protrusion 11 is disposed at the middle position of the auxiliary lip block 9, and the positioning protrusion 11 is inserted into the fabrication hole 25 of the guide cylinder 24 for installation, so that radial positioning can also be achieved.
The utility model also provides another embodiment, a plurality of positioning protrusions 11 are annularly arranged on a concentric circle in a discontinuous mode, and the plurality of positioning protrusions 11 can be installed on the periphery of the guide cylinder 24 in a clamping mode or installed in the process hole 25 of the guide cylinder 24 in a clamping mode, so that radial positioning can be achieved.
According to the height of the guide cylinder 24 protruding from the upper surface of the upper clamp plate 21, the height of the positioning protrusion 11 is at least 5mm, and more preferably 7mm or more, so as to ensure that the auxiliary shoe 9 and the hydraulic pump 51 do not deflect during adjustment operation, which affects operation quality and efficiency, and further helps to prevent the upper clamp plate 21 from being damaged by stress during operation.
A positioning protrusion (not shown) may also be provided on the upper surface of the auxiliary support pad 9 in an upward protruding manner, and when the diameter of the central through hole of the hydraulic pump 51 is larger than that of the boom 4, the upward positioning protrusion may be engaged into the central through hole of the hydraulic pump 51 to radially position the hydraulic pump 51, so as to ensure the central axes of the hydraulic pump 51, the boom 4 and the spring 2 to coincide with each other, and this structure is also beneficial to improving the versatility of the device.
As shown in fig. 1 and 2, a handle 13 is mounted at the top end of the boom 4, and the handle 13 is detachably mounted at the top of the boom 4, so that not only is it convenient for an operator to screw the boom 4, but also it is convenient for the operator to sequentially mount the auxiliary bolster 9, the hydraulic pump 51, the lock nut 8 and other components from the top of the boom 4 during operation. The top of the suspender 4 is provided with an internal threaded hole 14, the handle 13 extends downwards out of a threaded column (not shown in the figure), and the handle 13 is screwed on the top of the suspender 4, so that the suspender 4 can be rotated by an operator conveniently. The handle 13 may have a linear bar structure as shown in fig. 1 and 2, a circular ring structure, or a cross-shaped structure.
The working process of the device is described in detail as follows:
1. the wheel weight distribution of the railway vehicle bogie is checked, whether the height of a first spring 2 of a railway vehicle axle box meets the requirement of a design standard is detected, and if the height of the first spring 2 of the railway vehicle axle box does not meet the requirement of the design standard, an adjusting cushion block 3 below the first spring 2 is adjusted in an increasing and decreasing mode.
2. The lower end of the suspension rod 4 is inserted into the spring 23 through a hole 25 formed in the upper plate 21 of the spring assembly 2.
3. The auxiliary supporting cushion block 9 is sleeved on the suspension rod 4 and is arranged on the guide cylinder 24 of the upper clamping plate 21, so that the top of the guide cylinder 24 is just clamped in the groove 12 of the auxiliary supporting cushion block 9, and the radial positioning is realized.
4. The hydraulic pump 51 is sleeved on the boom 4, the bottom of the hydraulic pump 51 is placed on the auxiliary support cushion block 9, and the hydraulic pump 51 is connected with a hydraulic device through a pipeline.
5. The lock nut 8 is screwed and mounted on the upper end thread section 6 of the suspension rod 4, and the lock nut 8 is screwed to a predetermined height position according to the mounting requirement of the suspension rod 4.
6. A handle 13 is mounted on the top end of the boom 4.
7. The handle 13 is rotated to fixedly connect the lower end thread section 7 of the suspension rod 4 with the fabrication hole 25 of the lower clamping plate 21, so as to form a complete fastening system. At this time, the lock nut 8 may just contact the top end of the output end of the hydraulic pump 51, or may leave a certain gap.
8. The handle of the hydraulic device is operated to drive the output end of the hydraulic pump 51 to extend upwards until the output end contacts with the locking nut 8, the output end continues to extend upwards, the locking nut 8 can be jacked upwards, the locking nut 8 drives the suspender 4 to move upwards, the suspender 4 drives the lower clamping plate 22 to move upwards together, the middle spring 23 is compressed under the stress, and the whole bottom of the first series of springs 2 is lifted.
9. The hydraulic device is operated, the lower clamping plate 22 is continuously lifted, the spring 23 is compressed until the bottom of the series spring 2 is completely separated from the adjusting cushion block 3, an operating space required by an operator to increase or decrease the adjusting cushion block 3 is reserved between the bottom of the series spring 2 and the top of the shaft box body 1, and after the operating space meets the requirement, the operator stops operating the hydraulic device, so that the hydraulic pump 51 is kept at the extending position.
10. The operator increases and decreases the number of the adjusting cushion blocks 3 according to the requirement of a design standard so as to meet the height requirement of a first series spring 2 of the motor train unit.
11. After the adjusting cushion block 3 is adjusted, the hydraulic device is operated, so that the hydraulic pump 51 returns to the initial state, at this time, the top of the output end of the hydraulic pump 51 is separated from the locking nut 8, no interaction force exists, and the boom 4 and the lower clamp plate 22 also move downwards until a series spring 2 returns to the initial state.
12. The boom 4, the auxiliary shoe 9, the hydraulic pump 51 and the like are sequentially removed, the wheel weight distribution of the rail vehicle is redetected, and the height of the train spring 2 is checked.
13. If the requirement is met, the whole adjustment operation is finished; if not, repeating the steps until meeting the standard.
The device can be after rail vehicle falls, under the condition that need not lift the car, promote jib 4 through operation jacking device 5 and can drive the lower plate 22 of a series of spring 2 and rise, make spring 23 compress, with a series of spring 2 and adjustment cushion 3 temporary separation to accomplish the increase and decrease operation of adjustment cushion 3, be favorable to promoting the operating efficiency by a wide margin, when having solved the unsatisfied requirement of EMUs first height, can only lift the difficult problem of adjusting first height through the method of increase and decrease axle box spring adjustment cushion after the car.
The device is with 5 direct suits of jacking device on the jib, when utilizing locking nut 8 to adjust 4 mounted positions of jib, still utilize locking nut 8 as jacking device 5's bearing structure, make the device's overall structure simpler, the operation is also convenient safety more, 2 individual cooperation can accomplish the increase and decrease adjustment operation of adjustment cushion, can save and cause spring washer to scrap and relapse the operation and cause personnel extravagant because of lifting the car, not only be favorable to promoting the operating efficiency, the security when must rising the operation, still be favorable to reducing personnel's cost and material cost.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A bogie spring height adjustment auxiliary device which characterized in that: including jib and suit the jacking device on the jib, the jib has the external screw thread section at upper end and lower extreme at least, the lower extreme of jib is screwed with the lower plate of a series of spring and is connected lock nut is installed to the upper end of jib, the jacking device contacts with lock nut when the operation, the jacking device passes through lock nut and drives jib and lower plate lift.
2. A bogie-tie-spring height adjustment auxiliary device according to claim 1, characterized in that: the middle section of the suspender is a smooth rod, the jacking device is provided with a central through hole, and the suspender is in clearance fit with the central through hole of the jacking device.
3. A bogie spring height adjustment auxiliary device according to claim 1 or 2, wherein: and an auxiliary supporting cushion block is arranged on the upper clamping plate of the series spring, and the bottom of the jacking device is arranged on the auxiliary supporting cushion block.
4. A bogie-tie-spring height adjustment auxiliary device according to claim 3, wherein: the auxiliary supporting cushion block is provided with a center through hole for penetrating through the suspension rod, the center through hole is provided with a positioning bulge protruding downwards on the upper surface of the auxiliary supporting cushion block, and the positioning bulge is matched with the guide cylinder at the center of the upper clamping plate to realize radial positioning of the auxiliary supporting cushion block.
5. A bogie-tie-spring height adjustment auxiliary device according to claim 4, wherein: the positioning bulges are multiple and are arranged on a concentric circle in a discontinuous mode; or the positioning bulge is of a continuous annular structure and is embedded into the technical hole of the guide cylinder or is clamped and sleeved on the periphery of the guide cylinder.
6. A bogie-tie-spring height adjustment auxiliary device according to claim 5, wherein: the auxiliary supporting cushion block is disc-shaped, and the positioning protrusions are arranged along the peripheral edge of the auxiliary supporting cushion block.
7. A bogie-tie-spring height adjustment auxiliary device according to claim 4, wherein: the height of the positioning protrusion is at least 5 mm.
8. A bogie-tie-spring height adjustment auxiliary device according to claim 4, wherein: the diameter of the central through hole of the auxiliary supporting cushion block is matched with that of the suspender, and the suspender is in clearance fit with the central through hole.
9. A bogie-tie-spring height adjustment auxiliary device according to claim 1, characterized in that: a handle is detachably arranged at the top end of the hanging rod.
10. A bogie-tie-spring height adjustment auxiliary device according to claim 1, characterized in that: the jacking device is a hydraulic pump and a hydraulic device, the hydraulic pump is sleeved on the suspension rod, and the hydraulic pump is connected with the hydraulic device through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122203971.4U CN215640179U (en) | 2021-09-13 | 2021-09-13 | Auxiliary device for adjusting height of tie spring of bogie |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122203971.4U CN215640179U (en) | 2021-09-13 | 2021-09-13 | Auxiliary device for adjusting height of tie spring of bogie |
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| CN215640179U true CN215640179U (en) | 2022-01-25 |
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| CN202122203971.4U Active CN215640179U (en) | 2021-09-13 | 2021-09-13 | Auxiliary device for adjusting height of tie spring of bogie |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115649217A (en) * | 2022-12-21 | 2023-01-31 | 济南工程职业技术学院 | Railway vehicle, bogie and primary spring suspension device thereof |
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2021
- 2021-09-13 CN CN202122203971.4U patent/CN215640179U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115649217A (en) * | 2022-12-21 | 2023-01-31 | 济南工程职业技术学院 | Railway vehicle, bogie and primary spring suspension device thereof |
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