Supporting and transporting device for vehicle body steel structure assembly

Abstract

The utility model discloses a vehicle body steel structure assembly supporting and transporting device, which belongs to the field of rail transit vehicle body assembly, and comprises a chassis with rail wheels and supporting columns arranged at two ends of the chassis, and the supporting columns are connected with a lifting seat through a transmission mechanism; the transmission mechanism comprises a transmission rod and a driven gear, the transmission rod is arranged on one side of the supporting column and can rotate around the vertical axis for transmission, the driven gear is rotationally connected with the supporting column, the transmission rod is meshed with the driven gear through a driving gear, the driven gear is in spiral transmission with the lifting seat, and the driving gear is meshed with the driven gear. According to the utility model, the balance can be quickly adjusted in a labor-saving manner, so that the vehicle body is stable, the positioning is accurate, and the beneficial effects of moving the vehicle and keeping people immobile, forming assembly line work, high production efficiency and good management traceability are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of the car body assembly of rail transit vehicles, in particular to an assembly support and transportation device for the car body steel structure. Background Art

[0002] At present, when the steel structures of subways and high-speed rails are transported to the assembly line after being completed in production, they were originally transported to the assembly line by using false carriages (freight car bogies). When arriving at the assembly line, the car body steel structure was lifted onto the supporting stools for the car body by a crane, and then the general assembly production was carried out. During the on-vehicle and off-vehicle on-site construction process, since the supporting stools for the car body are fixed positions, the car body cannot be transferred for production on the supporting stools for the car body, that is, the car does not move and the people move. The personnel of each process come to this process and are grouped for operation according to their skill categories. The operation management is chaotic, the production efficiency is low, and various managements cannot be implemented and the traceability is poor.

[0003] On the assembly line, for the car body steel structure transported by the false carriage, we have been following the past method of using a crane to lift the car body steel structure from the false carriage onto the supporting stools for the car body for the construction of the assembly station. There are the following problems in the production on the assembly line;

[0004] 1) If the steel structure of the subway car body is directly transported to the assembly line process for production by using a false carriage (transport vehicle), due to the limited space of the false carriage, it is impossible to carry out the assembly and assembly on the vehicle and under the vehicle (installing the under-vehicle box body, routing the cable, and the under-vehicle braking system).

[0005] 2) If the car body is frequently lifted to the supporting stools of the next process by a crane, there are major safety hazards in such an operation process. The crane lifting and landing of the car body is inaccurate, and the adjustment workload is very large, resulting in the inclination of the car body, prominent quality problems, and low work efficiency.

[0006] 3) The supporting stools for the car body are fixed positions, and the car body cannot be transferred for production on the supporting stools for the car body, that is, the car does not move and the people move. The personnel of each process come to this process and are grouped for operation according to their skill categories. The operation management is chaotic, the production efficiency is low, and various managements cannot be implemented and the traceability is poor. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the defects existing in the prior art, and provide an assembly support and transportation device for the car body steel structure, which can solve the problems of difficult lifting, transfer, and on-vehicle and off-vehicle operation when the steel structures of subways and high-speed rails are transported to the assembly line after being completed in production, as well as the problems of the car not moving and the people moving, low production efficiency, and poor traceability of various managements.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] The assembly support and transportation device for the car body steel structure disclosed by the utility model includes:

[0010] A chassis with track wheels and support columns installed at both ends of the chassis, and the support columns are connected with a lifting seat through a transmission mechanism;

[0011] The transmission mechanism includes a transmission rod arranged on one side of the support column and capable of rotating and driving around a vertical axis, and a passive gear rotatably connected to the support column. The transmission rod is meshed with the passive gear through an active gear. Wherein, the passive gear is in screw transmission with the lifting seat.

[0012] Further, a positioning plate with an L-shaped structure is fixedly connected to the top end of the lifting seat.

[0013] Further, the chassis includes a cross beam. Two spaced track wheel connecting plates are fixedly connected to both ends of the cross beam. The track wheels are rotatably connected to both ends of the track wheel connecting plates. The support columns are fixedly connected to the upper parts of both ends of the cross beam. The passive gear is rotatably connected to the top end of the support column.

[0014] Further, a bottom plate is fixedly connected to the bottom end of the support column and is connected to the cross beam through the bottom plate. The length of the cross beam is greater than the width of the vehicle body. Long circular holes are opened on the bottom plate and / or the cross beam.

[0015] Further, a towing ring is fixedly connected to the side of the cross beam.

[0016] In the above technical solution, for the vehicle body steel structure assembly support and transportation device provided by the present utility model, the beneficial effects are as follows:

[0017] 1) For this support and transportation device, gear transmission is adopted. The vehicle body steel structure can be directly placed on this device by a car lifter, enabling the vehicle body steel structure to flow into each process of the assembly line for production, avoiding repeated workstations, separating operation from transfer, effectively shortening the production of each process. Moreover, the operation of the bottleneck process is improved from six aspects of personnel, machine, material, method, environment, and measurement to shorten the operation time of the bottleneck process, realizing the situation of the vehicle moving while the people remain stationary, solidifying management, dividing into workstations, forming a single-piece flow according to the beat, standardizing the operation area, operation content, operation time, and operation actions, and quickly exposing and handling abnormal problems;

[0018] 2) For the support and transportation device, the transmission mechanism first utilizes the screw transmission mechanism between the passive gear and the lifting seat to achieve the first-level labor-saving principle, that is, the passive gear rotates as a nut to achieve the linear lifting movement of the lead screw, thereby completing the leveling and height position change of the support. Secondly, the rotation of the nut is driven by the active gear transmission. The transmission rod is manually driven to drive the active gear to rotate. The active gear is in transmission with the passive gear on the support column. As the central hole of the passive gear is an internal thread, it acts as a nut and cooperates with the stud of the lifting seat, and the second-level labor-saving principle is achieved by using the gear transmission mechanism, which can quickly adjust the balance labor-savingly to make the vehicle body stable and the positioning accurate. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments described in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is an axonometric view of the vehicle body steel structure assembly support and transportation device disclosed by the present utility model;

[0021] Figure 2 is an axonometric view of another perspective of the vehicle body steel structure assembly support and transportation device disclosed by the present utility model;

[0022] Figure 3 is the front view of the vehicle body steel structure assembly support and transportation device disclosed by the present utility model;

[0023] Figure 4 is the top view of the vehicle body steel structure assembly support and transportation device disclosed by the present utility model.

[0024] Explanation of reference numerals:

[0025] 1, chassis; 2, track wheel; 3, support column; 4, lifting seat; 5, transmission rod; 6, passive gear, 7, active gear; 8, positioning plate; 9, cross beam; 10, wheel connecting plate; 11, bottom plate; 12, towing ring. Specific embodiments

[0026] To enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail in conjunction with the drawings.

[0027] See Figure 1 、 2 as shown;

[0028] The vehicle body steel structure assembly process, this process method includes the following steps;

[0029] Step 1: Prepare the vehicle body steel structure;

[0030] Step 2: Lower the vehicle body. After the vehicle body steel structure is produced, lower the vehicle body steel structure onto the support and transportation device, and the support and transportation device transports the vehicle body through the factory track;

[0031] Step 3: Transport and level the vehicle body. After completing Step 2, directly transport the vehicle body steel structure to the assembly line using the support and transportation device, and adjust the support and transportation device at the assembly line site to level the vehicle body. Support the vehicle body at the assembly line site through the support and transportation device, so that the operator can work under the vehicle;

[0032] Step 4: After completing Step 3, transfer to the next process for production through the support and transportation device. Specifically, the support and transportation device is equipped with four track wheels, whose main function is to rotate on the track and send the car body to the next process for construction.

[0033] Step 5: Completion and off-line. After the car body is completed in the assembly line process, use the car lifting machine to lift the car body and push out the support and transportation device, and then replace it with a bogie.

[0034] Furthermore, in Step 1, the pre-process of the car body steel structure can be transferred to the support and transportation device by a dummy trolley, and then the dummy trolley exits. The support and transportation device is used to transport the car body to the assembly process.

[0035] This process method uses the support and transportation device and adopts a process method that combines car body lowering, transportation, car body leveling, and underbody operations, realizing a process plan of car moving while people staying still and forming an assembly line, enabling the vehicle to flow into each process of the assembly line, avoiding duplicate workstations, separating operations from transfers, shortening the production time of each process, improving production efficiency, and effectively solving the operation technical problems in the environments such as car body lowering, car body leveling, underbody operations, transportation transfer, and frequent use of overhead cranes for lifting on the assembly line;

[0036] The support and transportation device adopts a general design, realizing in-station rhythm production. A station refers to the area position where the product, that is, the car body, stays relatively when flowing on the production line and the employees complete the specified operation content within one beat. A station is the smallest unit of operation management. A production line (process) is composed of several connected stations. By running the support and transportation device on the track, guided by pull-type production and aiming to ensure the production rhythm, using this method can not only improve production efficiency and product quality but also stabilize the management method of production operations. An assembly line is to avoid duplicate workstations and separate operations from transfers. In-station system means that each person does a fixed number of things, with standard operations. Rhythm production means working together and finishing at the same time, emphasizing operation just-in-time;

[0037] The car body is located on the support and transportation device. After being completed at the station (site), it can be quickly moved to the next station for production by using the factory track. It not only realizes in-station rhythm production but also is applicable to the production of multiple types of vehicle models entering the assembly line, achieving the most optimized process layout, and saving the time for car body fixing, leveling, and transportation transfer. When the car body is lowered onto the support and transportation device, it can quickly adjust the balance to make the car body stable, with accurate positioning, large operation space above and below the car, avoiding damage to the car body, and safely transferring to the next process. Adopting a new process that combines car body lowering, transportation, car body leveling, and underbody operations to replace overhead crane lifting not only saves the auxiliary time such as car body lowering, adjustment, and transportation in the past but also achieves considerable economic benefits.

[0038] The advantages of the station-based rhythmization are as follows: it realizes the situation where the vehicle moves while the workers stay still, the management is solidified, the production process is divided into stations, and a single-piece flow is formed according to the rhythm. The operation area, operation content, operation time, and operation actions are standardized, and abnormal problems are quickly exposed and processed.

[0039] The working time of the process has been effectively shortened. The bottleneck process is improved in terms of six aspects: man, machine, material, method, environment, and measurement, so as to shorten the operation time of the bottleneck process. For example, the rhythm-based material part distribution, the overall assembly of the vehicle body at the assembly line station, the adjustment of the equipment layout, etc. These improvements in the operation method have greatly improved the operation speed of the bottleneck process and shortened the beat time.

[0040] Furthermore, in step three, four sets of the said support and transportation devices are arranged at the lower part of the vehicle body.

[0041] The calculation method of the support top force of the support and transportation device is as follows;

[0042] Using the formula: F a = T / ((d 2 / 2 + tg(ψ + ρ)) to obtain the calculation of the spiral lifting force F a ;

[0043] Using the formula: K = d 1 / d 2 to obtain the gear meshing transmission ratio;

[0044] Using the formula: F = F a * K = 34500 * 4.65 = 160425 N·M to obtain the top force F of the support device.

[0045] See Figures 1-4 as shown:

[0046] The utility model relates to a support and transportation device for the assembly of a vehicle body steel structure, which includes a chassis 1 with track wheels 2 and support columns 3 installed at both ends of the chassis 1. The support columns 3 are connected with a lifting seat 4 through a transmission mechanism. The transmission mechanism includes a transmission rod 5 arranged on one side of the support column 3 and capable of rotating and transmitting around a vertical axis, and a passive gear 6 rotatably connected with the support column 3. A primary transmission is formed between the transmission rod 5 and the passive gear 6, and the passive gear 6 is in a spiral transmission with the lifting seat 4. The vehicle body is supported and the lifting of the vehicle body is adjusted through a secondary transmission formed by the passive gear 6 and the lifting seat 4.

[0047] Specifically, see Figure 1As shown in the figure, the support and transportation device includes a chassis 1. Track wheels 2 are installed at the lower part of the chassis 1. One support and transportation device is equipped with four track wheels 2. By cooperating with the two running rails on which the ground track train runs through the track wheels 2, the vehicle body is placed on this device and sent to the next process. At both ends of the upper part of the chassis 1, support columns 3 are fixedly connected. A lifting seat 4 is installed at the top of the support column 3. On one side of the support column 3, a rotatable transmission rod 5 is vertically connected through a connecting plate. A driving gear 7 is fixedly connected to the top of the transmission rod 5. The driving gear 7 meshes with a driven gear 6 rotatably connected to the top of the support column 3 to form a first-stage transmission. The central hole opened in the driven gear 6 has internal threads. A stud is fixedly connected to the lower part of the lifting seat 4. The driven gear 6 is in screw transmission with the stud of the lifting seat 4 through the internal threads to support the vehicle body in a second-stage transmission;

[0048] Preferably, the module of the driven gear 6 on the support column 3 is greater than N times that of the driving gear 7, where N is a natural number greater than 1. That is to say, the module of the driven gear 6 is greater than N times that of the driving gear 7, so as to achieve N-fold amplification of the transmission of the driven gear 6.

[0049] In this structure, the transmission mechanism first utilizes the screw transmission mechanism between the driven gear 6 and the lifting seat 4 to achieve the first-stage labor-saving principle, that is, the driven gear 6 rotates as a nut to achieve the linear lifting movement of the lead screw, so as to complete the leveling and height position change of the support. Secondly, the driving gear 7 is driven to rotate, and the transmission rod 5 is driven manually to drive the driving gear 7 to rotate. Of course, the transmission rod 5 can also be driven to rotate by a motor in the prior art. Then, the driving gear 7 is transmitted with the driven gear 6 on the support column 3. Since the central hole of the driven gear 6 is an internal thread, it acts as a nut and cooperates with the stud of the lifting seat 4, and the gear transmission mechanism is used to achieve the second-stage labor-saving principle, that is, the module of the driven gear 6 is greater than N times that of the driving gear 7, so as to achieve N-fold amplification of the transmission of the driven gear 6;

[0050] This vehicle body steel structure assembly support and transportation device utilizes the above first-stage labor-saving and second-stage labor-saving principles to support the weight of the vehicle body steel structure of 20 tons - 30 tons, that is, each support device supports about 16 tons of gravity. 4 groups of vehicle body steel structure assembly support and transportation devices are used at each station, and the total support is about 16 * 4 = 64 tons.

[0051] Specific calculation of the jacking force of the support device:

[0052] 1. Calculation of the screw lifting force F a , using the formula:

[0053] F a = T / ((d 2 / 2 + tg(ψ + ρ))

[0054] T is the torque;

[0055] d 2is the pitch diameter of the thread, d 2 = 46.051;

[0056] Ψ is the lead angle of the thread, tgψ = np / πd 2

[0057] n is the number of thread starts, take n = 1

[0058] p is the pitch, ρ is the equivalent friction angle, tgρ = f / cosβ

[0059] For a symmetric tooth profile, β = ɑ / 2 (ɑ is the thread profile angle)

[0060] f is the friction coefficient, take f = 0.1. When the pitch p = 3, the calculated lead angle of the thread is 2.481°;

[0061] The lifting screw is made of 45 steel, M48×3, and the torque on the surface T = 6900 N·M;

[0062] When [(d 2 / 2 + tg(ψ + ρ)] is less than 0.2, substitute 0.2 into the formula to calculate F a = 6900 / 0.2 = 34500 N·M

[0063] 2. Calculation of the transmission ratio of gear meshing, using the formula:

[0064] K = d 1 / d 2

[0065] Among them, d 1 is the pitch diameter of the driven gear 6, d 1 = 279;

[0066] d 2 is the pitch diameter of the driven gear 6, d 2 = 60;

[0067] K = 279 / 60 = 4.65;

[0068] 3. Calculation of the jacking force F of the support device, using the formula:

[0069] Formula: F = F a *K = 34500*4.65 = 160425 N·M

[0070] Converted to kg, 1 N·M = 0.102 kg

[0071] So F = 160425*0.102 = 16363.35 kg

[0072] Note: The calculation in the formula is about 16 tons for each support jacking force.

[0073] SeeFigure 3 As shown in:

[0074] In a preferred embodiment, a positioning plate 8 is fixedly connected to the top end of the lifting seat 4. Specifically, the positioning plate 8 is an L-shaped positioning plate 8, and its material is nylon. The seat plate of the positioning plate 8 is fixed on the lifting seat 4 through a positioning pin. The L-shaped positioning plate 8 is stuck inside the side beam of the vehicle body underframe, that is, for lateral positioning and longitudinal support to position the vehicle body. In this structure, through the contact between the positioning plate 8 and the vehicle body, the nylon positioning plate 8 can relieve the vibration and impact during transportation, protect the stability and safety of the vehicle body and the device. In addition, the nylon positioning plate 8 is used as a sound insulation cushion block, which can effectively reduce the sound and noise when the vehicle body falls on the device and during transportation, providing a quiet working and production environment. In addition, the nylon positioning plate 8 has good wear resistance, reducing the friction and damage between the vehicle body and the device (preventing the vehicle body from being scratched).

[0075] The vehicle body steel structure assembly support and transportation device adopts general chemical engineering tooling designs such as gear transmission, lifting support, nylon backing plate, and leveling transportation. It not only adapts to various subways, ensures firm support of the vehicle body, safe relocation transportation, and has obvious noise reduction and shock absorption effects, but also facilitates the operator to work on and off the vehicle during the process, shortening the process production time.

[0076] See Figure 2 、 4 As shown in:

[0077] In a preferred embodiment, the chassis 1 includes a cross beam 9. The cross beam 9 is the main body of the support and transportation device. Two spaced track wheel connecting plates 10 are fixedly connected to both ends of the cross beam 9. Track wheels 2 are rotatably connected to both ends of the track wheel connecting plates 10 to ensure the overall stability of the device. Support columns 3 are fixedly connected to the upper parts of both ends of the cross beam 9. A passive gear 6 is rotatably connected to the top end of the support column 3, and the support column 3 is a hollow structure so that the stud of the lifting seat 4 can penetrate into its interior when lifting and lowering;

[0078] A bottom plate 11 is fixedly connected to the bottom end of the support column 3 and is connected to the support plate on the cross beam 9. The length of the cross beam 9 is greater than the width of the vehicle body. Long round holes are opened on the bottom plate 11 and the support plate of the cross beam 9. The bottom plate 11 and the support plate are fixedly connected through bolt assemblies, facilitating the movement and adjustment of the support column 3 on the cross beam 9 to fix the positioning point, ensuring accurate positioning of the width of the lifting seat 4 and the vehicle body, so as to adapt to different vehicle models. Of course, long round holes can also be opened on the bottom plate 11 or the support plate according to actual needs;

[0079] In a preferred embodiment, a towing ring 12 is fixedly connected to the side of the cross beam 9. When the vehicle body is completed at the work station, the steel wire rope on the relocation vehicle is connected to the towing ring 12 of this device for convenient transportation transfer.

[0080] When the vehicle body steel structure assembly support and transportation device is in use, the vehicle body steel structure is transported to the assembly line. The vehicle body is lifted by a car lifting machine and this device is installed. During the process construction, after completion, the vehicle body is pushed into the next process for construction. After completion, the vehicle body is lifted by the car lifting machine and this device is removed, and then the bogie is replaced.

[0081] The specific usage steps are as follows:

[0082] First, longitudinal adjustment: When the vehicle body steel structure is transported to the assembly line and the vehicle body steel structure is lifted by a car lifting machine and this device is installed, the false bogie (transport vehicle) is withdrawn. Then, the two vehicle body steel structure assembly support and transportation devices are aligned with the fixed positions of the bolster and side beams of the vehicle body steel structure, and then the vehicle body is lowered (the vehicle body steel structure is placed on the L-shaped positioning plate 8 of this device).

[0083] Second, lateral adjustment: Since the vehicle body steel structures of each project have different vehicle widths, when one vehicle model is completed and other vehicle models are produced, the positioning width of the two support columns 3 is determined in advance according to the vehicle body width. The width adjustment base plate 11 is provided with oblong holes, which facilitate the movement and adjustment of the support columns 3 on the cross beam 9 to fix the positioning points, ensuring accurate positioning of the vehicle body steel structure assembly support and transportation device with the vehicle body width.

[0084] Height leveling: After the vehicle body steel structure is placed on this device, the vehicle body is leveled. By using the transmission mechanism, manually rotating the transmission rod 5 drives the driving gear 7 to rotate, and the driving gear 7 drives the driven gear 6 to rotate, realizing the linear lifting movement of the lifting seat 4, so as to complete the leveling of the supported vehicle body and the change of the height position.

[0085] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A vehicle body steel structure assembly support transportation device, characterized in that: include: A chassis (1) having track wheels (2) and support columns (3) mounted at both ends of the chassis (1), wherein the support columns (3) are connected to a lifting seat (4) via a transmission mechanism; The transmission mechanism comprises a transmission rod (5) arranged on one side of the support column (3) and capable of rotating around a vertical axis, and a passive gear (6) rotatably connected to the support column (3); the transmission rod (5) meshes with the passive gear (6) via a driving gear (7), wherein the passive gear (6) and the lifting seat (4) are spirally driven.

2. The supporting and transporting device according to claim 1, characterized in that; A positioning plate (8) having an L-shaped structure is fixedly connected to the top end of the lifting seat (4).

3. The vehicle body steel structure assembly support transportation device according to claim 1 is characterized in that ； The chassis (1) comprises a crossbeam (9), two ends of the crossbeam (9) are fixedly connected to two spaced rail wheel connecting plates (10), the two ends of the rail wheel connecting plates (10) are rotatably connected to the rail wheels (2), the upper parts of the two ends of the crossbeam (9) are fixedly connected to the support columns (3), and the top of the support columns (3) is rotatably connected to the passive gear (6).

4. The vehicle body steel structure assembly support transportation device according to claim 3, characterized in that; The bottom end of the support column (3) is fixedly connected to a bottom plate (11), and is connected to the cross beam (9) via the bottom plate (11). The cross beam (9) is longer than the width of the vehicle body, and oblong holes are provided on the bottom plate (11) and / or the cross beam (9).

5. The vehicle body steel structure assembly support transportation device according to claim 4, characterized in that ； A traction ring (12) is fixedly connected to the side of the cross beam (9).

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