Double-car fixed marshalling railway tank car group and marshalling method thereof

Abstract

The invention relates to a railway tank car group and a marshalling method thereof, in particular to a railway tank car group formed by double car fixed marshalling and a marshalling method thereof, and solves the problem that a part of manholes in a tank body and a crane pipe cannot be aligned to the upper position due to a lengthened car. The railway tank car set comprises a front railway tank car and a rear railway tank car which are connected through a traction rod and arranged in a front-back mirror symmetry mode. The front railway tank car comprises a tank body, a first-position traction bolster device, a second-position traction bolster device, a coupler buffer device and two groups of bogies; a manhole is formed in the top center of the tank; the first-position traction and bolster device and the second-position traction and bolster device are located below the front end and the rear end of the tank body respectively and fixedly connected with the tank body. The rear end of the coupler buffer device is fixedly connected with the one-position traction bolster device; the two groups of bogies are respectively positioned below the first-position traction bolster device and the second-position traction bolster device; the center distance between the manholes in the two tank bodies is equal to the distance between the two crane pipes; and the distance between the outer sides of the front and rear ends of the two coupler buffer devices is equal to the total length of two coupled conventional standard railway tank cars.

Description

Technical Field

[0001] The present invention relates to a railway tank car group and a marshalling method thereof, and particularly to a railway tank car group with double - car fixed marshalling and a marshalling method thereof. Background Art

[0002] With the continuous progress of railway freight technology, the load capacity of railway freight cars, including railway tank cars, has been increasing. To increase the load capacity of each railway tank car, the most direct method is to lengthen the vehicle to achieve the lengthening of the tank body. However, when loading and unloading railway tank cars, the manholes on the tank body need to be aligned with the loading and unloading arms of the existing ground loading and unloading facilities. After the vehicle is lengthened, some of the manholes on the tank bodies of the entire train may not be aligned with the loading and unloading arms of the existing ground loading and unloading facilities, resulting in the need to uncouple the entire train during unloading. On the one hand, this significantly reduces the unloading efficiency, and on the other hand, it also leads to a decrease in unloading safety.

[0003] There are two solutions for existing heavy - haul railway tank cars to solve the problem that some of the manholes on the tank bodies of the entire train are not aligned with the loading and unloading arms of the existing ground loading and unloading facilities after the vehicle is lengthened, which are as follows:

[0004] The first solution is to add manholes to each vehicle. Generally, 2 to 3 or even more manholes are set on one vehicle. However, for a multi - manhole tank car, first, it is inconvenient to operate; second, the cost increases; third, it makes the shape of the tank body more complex; fourth, it cannot well solve the unloading problem, and there will be more residual liquid remaining in the tank body after unloading, causing waste.

[0005] The second solution is to design the length of each railway tank car to be a length value that has a certain multiple relationship (a value greater than 1 and less than 2) with the spacing of the loading and unloading arms of the existing ground loading and unloading facilities. When adopting the second solution, since the spacing of the loading and unloading arms of the existing ground loading and unloading facilities is basically the same, the vehicle lengths calculated by this solution must also be basically fixed. Therefore, when adopting the second solution, first, it is difficult to meet the actual length requirements of current railway tank cars; second, it cannot completely solve the problem of loading and unloading alignment, and it can only be said that the number of uncoupling times is reduced. Summary of the Invention

[0006] The object of the present invention is to provide a railway tank car group with a fixed double - car formation and its formation method, so as to solve the problem that when the vehicle length is increased to improve the load capacity of each railway tank car, some manholes on the tank body of the whole train are not aligned with the loading and unloading arms of the existing ground loading and unloading facilities. When the prior art solves this problem by increasing the number of manholes, there are inconveniences in operation, increased costs, the shape of the tank body becomes more complex, and the unloading problem cannot be well solved. After unloading the tank body, there will be a lot of residual liquid left, resulting in waste. Or when solving this problem by designing the length of each railway tank car to be a length value that has a certain multiple relationship with the spacing of the loading and unloading arms of the existing ground loading and unloading facilities, the vehicle length is basically fixed, it is difficult to meet the actual length requirements of current railway tank cars, and the technical problem of loading and unloading alignment cannot be completely solved.

[0007] To solve the above - mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A railway tank car group with a fixed double - car formation, which is characterized in that:

[0009] It includes a front railway tank car, a rear railway tank car, a drawbar, and a braking device;

[0010] The front railway tank car and the rear railway tank car are arranged in sequence from front to back; the rear railway tank car is a mirror - symmetric tank car of the front railway tank car in the front - back direction, and the two are arranged in a front - back mirror - symmetric manner;

[0011] The front railway tank car includes a tank body, a first bolster device, a second bolster device, a coupler buffer device, and two sets of bogies;

[0012] A manhole that cooperates with the loading and unloading arm in the existing ground loading and unloading facilities is arranged at the center position of the top of the tank body;

[0013] The first bolster device and the second bolster device are respectively located below the front - end side and the rear - end side of the tank body close to the tank body, and are both fixedly connected to the tank body;

[0014] The coupler buffer device is located below the tank body, and its rear end is fixedly connected to the first bolster device, and its foremost end is the foremost end of the entire front railway tank car;

[0015] The two sets of bogies are respectively located below the first bolster device and the second bolster device, and the tank body is placed on the two sets of bogies through the first bolster device and the second bolster device;

[0016] The front and rear ends of the drawbar are respectively connected to the second bolster devices in the front railway tank car and the rear railway tank car, and the front railway tank car and the rear railway tank car are connected together through the drawbar;

[0017] The center distance between the manholes on the two tank bodies of the front railway tank car and the rear railway tank car is equal to the distance between the two loading arms in the existing ground loading and unloading facilities; the distance between the foremost end of the coupler buffer device in the front railway tank car and the rearmost end of the coupler buffer device in the rear railway tank car is equal to the total length of two conventionally standard railway tank cars after being coupled together.

[0018] The braking device is arranged below the tank bodies of the front railway tank car and the rear railway tank car and is used for vehicle braking.

[0019] Furthermore, the two-position bolster and drawbar device includes a bolster assembly, a drawbar beam assembly, an impact seat connecting seat, and an impact seat;

[0020] The bolster assembly and the drawbar beam assembly are arranged in a cross shape and are fixedly connected to each other; an arc surface adapted to the arc surface of the tank body bottom is arranged above the bolster assembly and the drawbar beam assembly, and they are fixedly connected to the tank body;

[0021] The impact seat connecting seat is fixedly connected to the rear end face of the drawbar beam assembly;

[0022] The impact seat is fixedly connected to the rear end of the impact seat connecting seat;

[0023] The front and rear ends of the drawbar are respectively connected to the drawbar beam assemblies on the two-position bolster and drawbar devices in the front railway tank car and the rear railway tank car, and the front railway tank car and the rear railway tank car are connected together through the drawbar.

[0024] In this way, the side beams and end beams in the existing structure are cancelled in the two-position bolster and drawbar device, which not only reduces the vehicle self-weight, but also can avoid the interference problem of the end beams in the existing structure when the two vehicles turn.

[0025] Furthermore, for the convenience of maintenance, the front and rear ends of the drawbar are respectively detachably connected to the drawbar beam assemblies on the two-position bolster and drawbar devices in the front railway tank car and the rear railway tank car.

[0026] Furthermore, in order to improve the unloading rate when the vehicle unloads, the tank body is of an inclined bottom structure, and a liquid collecting pit is arranged at the bottom of the inner cavity of the tank body at a position opposite to the manhole.

[0027] Furthermore, in order to not only meet the braking requirements during train operation, but also reduce the vehicle self-weight, the braking device is a set;

[0028] The front railway tank car and the rear railway tank car share a set of braking devices.

[0029] Furthermore, in order to make it more convenient for the operator to climb to the top of the tank body, the front railway tank car further includes an end ladder, and the end ladder is arranged at the front end and above the tank body and is fixedly connected to the tank body;

[0030] The one - end bolster device, coupler buffer device, bogie, end ladder and drawbar all adopt the existing structures in conventional standard railway tank cars.

[0031] Furthermore, for the safety of vehicle transportation, a safety valve and a safety monitoring system are also provided on the top of the tank body;

[0032] The safety monitoring system is used to monitor the pressure, temperature and liquid level of the tank body, and position the vehicle.

[0033] Furthermore, for high standardization, convenient design and processing, the structures of the front railway tank car and the rear railway tank car are the same.

[0034] Meanwhile, the present invention also provides a method for forming a formation of the above - mentioned railway tank car group with double - car fixed formation, which is characterized in that it includes the following steps:

[0035] Step 1: Calculate the maximum value of the length to which the tank body can be lengthened according to the distance between two loading and unloading pipes in the existing ground loading and unloading facilities, the preset safety distance between the front railway tank car and the rear railway tank car, and the total length of two connected conventional standard railway tank cars.

[0036] Step 2: Within the maximum value of the length to which the tank body can be lengthened calculated in Step 1, design and calculate the actual required length of the tank body according to the load requirement.

[0037] Step 3: On the condition that the center distance between two manholes in the front railway tank car and the rear railway tank car is equal to the distance between two loading and unloading pipes in the existing ground loading and unloading facilities, and the distance between the foremost end of the coupler buffer device in the front railway tank car and the rearmost end of the coupler buffer device in the rear railway tank car is equal to the total length of two connected conventional standard railway tank cars, according to the actual required length of the tank body calculated in Step 2, and the structural dimensions of the drawbar, two - end bolster device, one - end bolster device and coupler buffer device in the front - rear direction, calculate the relative position dimensions of the one - end bolster device and the two - end bolster device with respect to the tank body in the front - rear direction.

[0038] Step 4: Fix the one - end bolster device and the two - end bolster device to the tank body respectively according to the relative position dimensions of the one - end bolster device and the two - end bolster device with respect to the tank body in the front - rear direction calculated in Step 3, and assemble the rest of all structures according to the connection relationship, thus completing the formation.

[0039] Furthermore, the specific content of Step 1 is as follows:

[0040] Step 1.1: Calculate the maximum value of the length to which half of the tank body can be lengthened at one end in the middle direction between the front railway tank car and the rear railway tank car, and the maximum value of the length to which half of the tank body in the front railway tank car can be lengthened at the front - end direction, specifically:

[0041] Subtract the preset safety distance between the front railway tank car and the rear railway tank car from the distance between two loading and unloading arms in the existing ground loading and unloading facilities, and then divide the difference by 2, that is, the maximum value of the length to which half of the tank body at one end in the middle direction between the front railway tank car and the rear railway tank car can be extended;

[0042] Subtract the distance between two loading and unloading arms in the existing ground loading and unloading facilities from the total length after two conventional standard railway tank cars are coupled, and then divide the difference by 2, that is, the maximum value of the length to which half of the tank body at one end in the front end direction in the front railway tank car can be extended;

[0043] Step 1.2: Calculate the maximum value of the length to which the tank body can be extended;

[0044] Take the smaller value of the two maximum values of the length to which the half tank body can be extended calculated in Step 1.1, and multiply it by 2, that is, the maximum value of the length to which the tank body can be extended.

[0045] The beneficial effects of the present invention are:

[0046] (1) The railway tank car group with double - car fixed formation of the present invention connects the front railway tank car and the rear railway tank car together through a drawbar, saving the space of the car coupler structure required when two railway tank cars are separate compartments. And during the train operation, the drawbar cannot be disassembled. Therefore, when the buffer stroke under the longitudinal impact during train operation is satisfied and a certain margin is left, both tanks can extend and lengthen towards the middle direction between the two railway tank cars, thereby achieving the purpose of increasing the tank volume and the load capacity of the tank car. At the same time, by adjusting the relative positions of the first bolster device and the second bolster device with respect to the tank body respectively, the tank body on the front railway tank car can extend and lengthen towards the front end direction, and the tank body on the rear railway tank car can extend and lengthen towards the rear end direction. In this way, on the premise that the distance between the foremost end of the coupler buffer device in the front railway tank car and the rearmost end of the coupler buffer device in the rear railway tank car is kept equal to the total length after two conventional standard railway tank cars are coupled, the center - to - center distance between the manholes provided at the center positions of the tops of the two tanks in the front railway tank car and the rear railway tank car can always be equal to the distance between the two loading arms in the existing ground loading and unloading facilities. Furthermore, the distance from the manhole provided at the center position of the top of the tank body on the front railway tank car to the foremost end of the front railway tank car and the distance from the manhole provided at the center position of the top of the tank body on the rear railway tank car to the rearmost end of the rear railway tank car always remain equal to the distance from the manhole provided at the center of the top of the tank body of a single - section conventional standard railway tank car to the end of the car body. In this way, when multiple groups of the railway tank car groups with double - car fixed formation of the present invention are coupled, all manholes can be aligned with the loading arms in the existing ground loading and unloading facilities. Therefore, the present invention solves the problem that when the vehicle length is lengthened to increase the load capacity of each railway tank car, some manholes on the tanks of the whole train cannot be aligned with the loading arms in the existing ground loading and unloading facilities.

[0047] In addition, no manhole is added to the tank body in the present invention. Therefore, it also avoids the problems that occur when the prior art solves the problem of misalignment between the manhole and the loading arm by adding a manhole.

[0048] Moreover, for the railway tank car group with double - car fixed formation of the present invention, the length of the tank body can be designed and selected according to actual needs within a certain range. Therefore, it also avoids the problem of the basically fixed vehicle length that occurs when the prior art solves the problem of misalignment between the manhole and the loading arm by designing the length of each railway tank car as a length value with a certain multiple relationship with the distance between the loading arms in the existing ground loading and unloading facilities.

[0049] In summary, the present invention solves the problem that when the length of the vehicle is increased to improve the load capacity of each railway tank car, some manholes on the tank body of the whole train are not aligned with the loading and unloading arms of the existing ground loading and unloading facilities. When the prior art solves this problem by adding manholes, there are inconveniences in operation, increased costs, the shape of the tank body becomes more complex, and the unloading problem cannot be well solved. After unloading the tank car, there will be more residual liquid left in the tank body, resulting in waste. Or when solving this problem by designing the length of each railway tank car to be a length value that has a certain multiple relationship with the spacing of the loading and unloading arms of the existing ground loading and unloading facilities, the vehicle length is basically fixed, it is difficult to meet the actual length requirements of the current railway tank cars, and the technical problem of loading and unloading alignment cannot be completely solved.

[0050] (2) In the railway tank car group with double-car fixed formation of the present invention, the secondary bolster and drawbar device preferably includes a bolster assembly, a drawbar assembly, an impact seat connecting seat, and an impact seat. The side beams and end beams in the existing structure are cancelled. With this setting, not only the vehicle self-weight is reduced, but also the problem of interference between the end beams in the existing structure when the two vehicles turn can be avoided.

[0051] (3) When multiple groups of the railway tank car groups with double-car fixed formation of the present invention are coupled, not only can all manholes be aligned with the loading and unloading arms in the existing ground loading and unloading facilities to meet the unloading requirements of each tank car, but also the load capacity of each tank car can be increased, and the volume of the tank body can be selected according to actual needs within a certain range.

[0052] (4) In the railway tank car group with double-car fixed formation of the present invention, the existing coupler buffer device is still used at both ends during formation. Therefore, it meets the requirement of being coupled with other vehicles.

[0053] (5) In the railway tank car group with double-car fixed formation of the present invention, the manhole is arranged at the center position on the top of the tank body, and preferably the tank body is of an inclined bottom structure, and a liquid collecting pit is arranged at the bottom of the inner cavity of the tank body at a position directly opposite to the manhole. With this setting, compared with the scheme of arranging multiple manholes on the tank body, the unloading rate can be greatly improved.

[0054] (6) In the railway tank car group with double-car fixed formation of the present invention, it is preferred that the front railway tank car and the rear railway tank car share a set of braking devices. With this setting, it can not only meet the braking requirements during train operation, but also reduce the vehicle self-weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a schematic diagram of the overall structure of an embodiment of the railway tank car group with double-car fixed formation of the present invention;

[0056] Figure 2 is a schematic diagram of the structure of the tank body in an embodiment of the railway tank car group with double-car fixed formation of the present invention;

[0057] Figure 3 This is a schematic structural view of the second-place bolster and pillow device in an embodiment of the railway tank car group with double-car fixed formation of the present invention.

[0058] The descriptions of the reference numerals in the figure are as follows:

[0059] 01 - Front railway tank car, 1 - Tank body, 11 - Manhole, 12 - Liquid accumulation pit, 13 - Safety valve, 14 - Safety monitoring system, 2 - First-place bolster and pillow device, 3 - Second-place bolster and pillow device, 31 - Bolster beam assembly, 32 - Draft gear beam assembly, 321 - Draft rod connection hole, 33 - Impact seat connection seat, 34 - Impact seat, 4 - Coupler buffer device, 5 - Bogie, 6 - End ladder, 02 - Rear railway tank car, 03 - Draft rod, 04 - Braking device. Specific embodiments

[0060] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] See Figure 1 , a railway tank car group with double-car fixed formation of the present invention includes a front railway tank car 01, a rear railway tank car 02, a draft rod 03, and a braking device 04.

[0062] See Figure 1, the above-mentioned front railway tank car 01 and rear railway tank car 02 are arranged in sequence from front to back; the rear railway tank car 02 is a front-back mirror-symmetrical tank car of the front railway tank car 01, and the two are arranged in a front-back mirror-symmetrical manner; the above-mentioned front railway tank car 01 includes a tank body 1, a first end bolster device 2, a second end bolster device 3, a coupler buffer device 4, and two sets of bogies 5; a manhole 11 that cooperates with the loading and unloading arm in the existing ground loading and unloading facilities is arranged at the center position of the top of the above-mentioned tank body 1; the above-mentioned first end bolster device 2 and second end bolster device 3 are respectively located below one side of the tank body 1 close to the front end and one side close to the rear end, and are both fixedly connected to the tank body 1; the above-mentioned coupler buffer device 4 is located below the tank body 1, and its rear end is fixedly connected to the first end bolster device 2, and its foremost end is the foremost end of the entire front railway tank car 01; the above-mentioned two sets of bogies 5 are respectively located below the first end bolster device 2 and the second end bolster device 3, and the tank body 1 is placed on the two sets of bogies 5 through the first end bolster device 2 and the second end bolster device 3; the front and rear ends of the above-mentioned drawbar 03 are respectively connected to the second end bolster devices 3 in the front railway tank car 01 and the rear railway tank car 02, and the front railway tank car 01 and the rear railway tank car 02 are connected together through the drawbar 03; the center distance between the above-mentioned manholes 11 on the two tank bodies 1 in the front railway tank car 01 and the rear railway tank car 02 is equal to the distance between the two loading and unloading arms in the existing ground loading and unloading facilities; the distance between the foremost end of the coupler buffer device 4 in the front railway tank car 01 and the rearmost end of the coupler buffer device 4 in the rear railway tank car 02 is equal to the total length after two conventional standard railway tank cars are coupled; the above-mentioned braking device 04 is arranged below the tank bodies 1 of the front railway tank car 01 and the rear railway tank car 02 for vehicle braking.

[0063] See Figure 2 , in this embodiment, the above-mentioned tank body 1 is formed by welding a head and a cylinder. In order to improve the unloading rate when the vehicle unloads, it is preferred in this embodiment that the above-mentioned tank body 1 is of an inclined bottom structure, and a liquid collecting pit 12 is arranged at the bottom of the inner cavity of the tank body 1 at a position directly opposite to the above-mentioned manhole 11. And for the safety of vehicle transportation, a safety valve 13 and a safety monitoring system 14 are also arranged on the top of the tank body 1 in this embodiment; the safety monitoring system 14 is used to monitor the pressure, temperature and liquid level of the tank body 1 and position the vehicle.

[0064] In this embodiment, the first end bolster device 2 adopts an existing mature bolster structure in a conventional standard railway tank car.

[0065] See Figure 3, in this embodiment, the above-mentioned two-position bolster and drawbar device 3 includes a bolster assembly 31, a drawbar assembly 32, an impact seat connecting seat 33, and an impact seat 34. The bolster assembly 31 and the drawbar assembly 32 are arranged in a cross shape and are fixedly connected to each other. In this embodiment, they are fixedly connected by welding; an arc surface adapted to the bottom arc surface of the tank body 1 is provided above the bolster assembly 31 and the drawbar assembly 32, and they are fixedly connected to the tank body 1. In this embodiment, both the bolster assembly 31 and the drawbar assembly 32 are fixedly connected to the tank body 1 by welding; the above-mentioned impact seat connecting seat 33 is fixedly connected to the rear end face of the drawbar assembly 32. In this embodiment, the impact seat connecting seat 33 is fixedly connected to the rear end face of the drawbar assembly 32 by welding; the above-mentioned impact seat 34 is fixedly connected to the rear end of the impact seat connecting seat 33. In this embodiment, the impact seat 34 is riveted to the rear end of the impact seat connecting seat 33; the front and rear ends of the above-mentioned drawbar 03 are respectively connected to the drawbar assemblies 32 on the two-position bolster and drawbar devices 3 in the front railway tank car 01 and the rear railway tank car 02, and the front railway tank car 01 and the rear railway tank car 02 are connected together through the drawbar 03; for the convenience of maintenance, the front and rear ends of the above-mentioned drawbar 03 are respectively detachably connected to the drawbar assemblies 32 on the two-position bolster and drawbar devices 3 in the front railway tank car 01 and the rear railway tank car 02, see Figure 3 , the drawbar connection hole 321 provided on the drawbar assembly 32 is the installation hole for connecting with the drawbar 03. The drawbar 03 is not disassembled during the operation of the train and is only disassembled during maintenance. The drawbar 03 adopts the existing structure in the conventional standard railway tank car. As described above, the two-position bolster and drawbar device 3 in this embodiment cancels the side beams and end beams in the existing structure, which not only reduces the vehicle self-weight but also avoids the interference problem of the end beams in the existing structure when the two vehicles turn.

[0066] In this embodiment, the above-mentioned coupler buffer device 4 and the bogie 5 both adopt the existing mature structures in the conventional standard railway tank car.

[0067] In order to make it more convenient for the operator to climb to the top of the tank body 1, the above-mentioned front railway tank car 01 further includes an end ladder 6. The end ladder 6 is arranged at the front end and above the tank body 1 and is fixedly connected to the tank body 1. In this embodiment, the end ladder 6 adopts the existing mature structure in the conventional standard railway tank car.

[0068] In order to not only meet the braking requirements during the operation of the train but also reduce the vehicle self-weight, in this embodiment, it is preferred that the above-mentioned braking device 04 is a set; the front railway tank car 01 and the rear railway tank car 02 share a set of braking devices 04. The braking device 04 adopts the existing mature structure in the conventional standard railway tank car.

[0069] In order to have a high degree of standardization, facilitate design and processing, in this embodiment, it is preferred that the structures of the front railway tank car 01 and the rear railway tank car 02 are the same.

[0070] The present invention also provides a method for forming a railway tank car group with the above-described double-car fixed formation, including the following steps:

[0071] Step 1: Calculate the maximum length to which the tank body 1 can be extended according to the distance between two loading and unloading arms in the existing ground loading and unloading facilities, the preset safety distance between the front railway tank car 01 and the rear railway tank car 02, and the total length after two conventional standard railway tank cars are coupled. Specifically:

[0072] Step 1.1: Calculate the maximum length to which half of the tank body 1 at one end in the middle direction between the front railway tank car 01 and the rear railway tank car 02 can be extended, and the maximum length to which half of the tank body 1 at one end in the front end direction in the front railway tank car 01 can be extended. Specifically:

[0073] Subtract the preset safety distance between the front railway tank car 01 and the rear railway tank car 02 from the distance between two loading and unloading arms in the existing ground loading and unloading facilities, and then divide the difference by 2 to obtain the maximum length to which half of the tank body 1 at one end in the middle direction between the front railway tank car 01 and the rear railway tank car 02 can be extended;

[0074] Subtract the distance between two loading and unloading arms in the existing ground loading and unloading facilities from the total length after two conventional standard railway tank cars are coupled, and then divide the difference by 2 to obtain the maximum length to which half of the tank body 1 at one end in the front end direction in the front railway tank car 01 can be extended;

[0075] Step 1.2: Calculate the maximum length to which the tank body 1 can be extended;

[0076] Take the smaller value of the two maximum lengths to which the above-mentioned half of the tank body 1 can be extended calculated in Step 1.1, and multiply it by 2 to obtain the maximum length to which the tank body 1 can be extended;

[0077] Step 2: Design and calculate the actual required length of the tank body 1 according to the load requirement within the maximum length to which the tank body 1 can be extended calculated in Step 1;

[0078] Step 3: Under the condition that the center distance between two manholes 11 in the front railway tank car 01 and the rear railway tank car 02 is equal to the distance between two loading and unloading arms in the existing ground loading and unloading facilities, and the distance between the rearmost end of the coupler buffer device 4 in the front railway tank car 01 and the foremost end of the coupler buffer device 4 in the rear railway tank car 02 is equal to the total length after two conventional standard railway tank cars are coupled, calculate the relative position dimensions in the front-rear direction between the first bolster device 2, the second bolster device 3 and the tank body 1 according to the actual required length of the tank body 1 designed and calculated in Step 2, and the structural dimensions of the drawbar 03, the second bolster device 3, the first bolster device 2 and the coupler buffer device 4 in the front-rear direction;

[0079] Step 4: According to the relative position dimensions in the front-back direction between the first drawbar and bolster device 2 and the second drawbar and bolster device 3 calculated in Step 3, fixedly connect the first drawbar and bolster device 2 and the second drawbar and bolster device 3 to the tank body 1 respectively, and group and assemble all the remaining structures according to the connection relationship, thus completing the marshalling.

[0080] When multiple groups of the railway tank car sets with double-car fixed marshalling of the present invention are coupled, not only can all manholes be aligned with the loading and unloading arms in the existing ground loading and unloading facilities to meet the unloading requirements of each tank car, but also the load capacity of each tank car can be increased, and the volume of the tank body can be selected according to actual needs within a certain range.

Claims

1. A railway tank car group with a fixed double - car formation, characterized in that: It includes a front railway tank car (01), a rear railway tank car (02), a drawbar (03) and a braking device (04); The front railway tank car (01) and the rear railway tank car (02) are arranged in sequence from front to back; the rear railway tank car (02) is a mirror - symmetric tank car of the front railway tank car (01) in the front - back direction, and the two are arranged in front - back mirror symmetry; The front railway tank car (01) includes a tank body (1), a first bolster device (2), a second bolster device (3), a coupler buffer device (4) and two sets of bogies (5); At the center position of the top of the tank body (1), there is a manhole (11) that cooperates with the loading and unloading arm in the existing ground loading and unloading facilities; The first bolster device (2) and the second bolster device (3) are respectively located below the front - end side and the rear - end side of the tank body (1), and are both fixedly connected to the tank body (1); The coupler buffer device (4) is located below the tank body (1), its rear end is fixedly connected to the first bolster device (2), and its foremost end is the foremost end of the entire front railway tank car (01); The two sets of bogies (5) are respectively located below the first bolster device (2) and the second bolster device (3), and the tank body (1) is placed on the two sets of bogies (5) through the first bolster device (2) and the second bolster device (3); The front and rear ends of the drawbar (03) are respectively connected to the second bolster devices (3) in the front railway tank car (01) and the rear railway tank car (02), and the front railway tank car (01) and the rear railway tank car (02) are connected together through the drawbar (03); The center distance between the manholes (11) on the two tank bodies (1) of the front railway tank car (01) and the rear railway tank car (02) is equal to the distance between the two loading and unloading arms in the existing ground loading and unloading facilities; the distance between the foremost end of the coupler buffer device (4) in the front railway tank car (01) and the rearmost end of the coupler buffer device (4) in the rear railway tank car (02) is equal to the total length after two conventional standard railway tank cars are coupled; The braking device (04) is arranged below the tank bodies (1) of the front railway tank car (01) and the rear railway tank car (02) for vehicle braking.

2. The railway tank car group with a fixed double - car formation according to claim 1, characterized in that: The second bolster device (3) includes a bolster assembly (31), a draft beam assembly (32), an impact seat connecting seat (33) and an impact seat (34); The bolster assembly (31) and the draft beam assembly (32) are arranged in a cross - shape and are fixedly connected to each other; above the bolster assembly (31) and the draft beam assembly (32), there is an arc surface adapted to the bottom arc surface of the tank body (1), and the two are fixedly connected to the tank body (1); The impact seat connecting seat (33) is fixedly connected to the rear - end face of the draft beam assembly (32); The impact seat (34) is fixedly connected to the rear end of the impact seat connecting seat (33); The front and rear ends of the drawbar (03) are respectively connected to the drawbar assembly (32) on the secondary bolster device (3) in the front railway tank car (01) and the rear railway tank car (02), and the front railway tank car (01) and the rear railway tank car (02) are connected together through the drawbar (03).

3. The railway tank car group with double-car fixed formation according to claim 2, characterized in that: The front and rear ends of the drawbar (03) are respectively detachably connected to the drawbar assembly (32) on the secondary bolster device (3) in the front railway tank car (01) and the rear railway tank car (02).

4. The railway tank car group with double-car fixed formation according to claim 1, characterized in that: The tank body (1) has an inclined bottom structure, and a liquid collecting pit (12) is provided at the bottom of the inner cavity of the tank body (1) at a position directly opposite to the manhole (11).

5. The railway tank car group with double-car fixed formation according to claim 1, characterized in that: There is one set of braking devices (04); The front railway tank car (01) and the rear railway tank car (02) share one set of braking devices (04).

6. The railway tank car group with double-car fixed formation according to claim 1, characterized in that: The front railway tank car (01) further includes an end ladder (6), and the end ladder (6) is arranged at the front end and above the tank body (1) and is fixedly connected to the tank body (1); The primary bolster device (2), coupler buffer device (4), bogie (5), end ladder (6) and drawbar (03) all adopt the existing structures in conventional standard railway tank cars.

7. The railway tank car group with double-car fixed formation according to claim 1, characterized in that: A safety valve (13) and a safety monitoring system (14) are further arranged on the top of the tank body (1); The safety monitoring system (14) is used to monitor the pressure, temperature and liquid level of the tank body (1) and position the vehicle.

8. The railway tank car group with double-car fixed formation according to any one of claims 1 to 7, characterized in that: The front railway tank car (01) and the rear railway tank car (02) have the same structure.

9. A method for forming a railway tank car group with a double-car fixed formation according to any one of claims 1 to 8, characterized in that, It includes the following steps: Step 1: Calculate the maximum value of the length to which the tank body (1) can be extended according to the distance between two loading arms in the existing ground loading and unloading facilities, the preset safety distance between the front railway tank car (01) and the rear railway tank car (02), and the total length after two conventional standard railway tank cars are coupled; Step 2: Design and calculate the actual required length of the tank body (1) within the maximum value of the length to which the tank body (1) can be extended calculated in Step 1 according to the load requirement. Step 3: Under the condition that the center distance between two manholes (11) in the front railway tank car (01) and the rear railway tank car (02) is equal to the distance between two loading and unloading arms in the existing ground loading and unloading facilities, and the distance between the foremost end of the coupler buffer device (4) in the front railway tank car (01) and the rearmost end of the coupler buffer device (4) in the rear railway tank car (02) is equal to the total length of two regularly standard railway tank cars after being coupled, according to the actually required length of the tank body (1) obtained from the design calculation in Step 2, as well as the structural dimensions of the drawbar (03), the second bolster device (3), the first bolster device (2), and the coupler buffer device (4) in the front-rear direction, calculate the relative position dimensions of the first bolster device (2) and the second bolster device (3) with respect to the tank body (1) in the front-rear direction respectively; Step 4: According to the relative position dimensions of the first bolster device (2) and the second bolster device (3) with respect to the tank body (1) in the front-rear direction calculated in Step 3, fixedly connect the first bolster device (2) and the second bolster device (3) with the tank body (1) respectively, and group and assemble all the remaining structures according to the connection relationship, thus completing the formation of the group.

10. The formation method of the railway tank car group with double-car fixed formation according to claim 9, wherein: The specific content of the said Step 1 is as follows: Step 1.1: Calculate the maximum length that half of the tank body (1) at one end in the middle direction between the front railway tank car (01) and the rear railway tank car (02) can be extended to, and the maximum length that half of the tank body (1) at one end in the front end direction in the front railway tank car (01) can be extended to. Specifically: Subtract the preset safety distance between the front railway tank car (01) and the rear railway tank car (02) from the distance between two loading and unloading arms in the existing ground loading and unloading facilities, and then divide the obtained difference by 2, thus obtaining the maximum length that half of the tank body (1) at one end in the middle direction between the front railway tank car (01) and the rear railway tank car (02) can be extended to; Subtract the distance between two loading and unloading arms in the existing ground loading and unloading facilities from the total length of two regularly standard railway tank cars after being coupled, and then divide the obtained difference by 2, thus obtaining the maximum length that half of the tank body (1) at one end in the front end direction in the front railway tank car (01) can be extended to; Step 1.2: Calculate the maximum length that the tank body (1) can be extended to; Take the smaller value of the two maximum lengths that the half tank bodies (1) can be extended to calculated in Step 1.1, and multiply it by 2, thus obtaining the maximum length that the tank body (1) can be extended to.

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