Flatbed truck for rescue and repair vehicles

Abstract

The present invention relates to a flatbed truck for transporting a rescue and repair vehicle, comprising a frame, a driving device, a braking system and a ladder, wherein the frame is mounted on the driving device, the braking system is mounted at the bottom of the frame and connected to the driving device, the start and stop of the flatbed truck are controlled by the braking system, the ladder is mounted at the rear of the frame and can be deployed or retracted, a supporting device for supporting or retracting is respectively mounted on the left and right sides of the front of the frame, a rear support leg is mounted at the bottom of the rear end of the frame, a suspension device is mounted between the frame and the driving device, a towing device for connecting with the rescue and repair vehicle is mounted at the front end of the frame, and the towing device is connected to the towing arm assembly of the rescue and repair vehicle through a latch. The present invention has a simple structure, can be docked with a main vehicle through a connecting device, has fast and convenient operation, and has reliable and stable connection, and can safely and reliably drag the damaged vehicle onto the flatbed truck for transport through the pulley block and the winch on the main vehicle.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment, and in particular to a transport flatbed truck for rescuing and repairing a vehicle. Background Art

[0002] At present, vehicle failures are usually rescued by rescue and repair vehicles. The main vehicle is equipped with cantilever lifting equipment, on-site rescue tools, winches and towing devices. Under normal circumstances, the main vehicle can independently complete the rescue and repair tasks. However, when the faulty vehicle cannot be operated and needs to be towed away for repair, a follow-up flatbed truck is also required to complete the rescue mission. Conventional follow-up flatbed trucks can be docked with the main vehicle through a towing pin device. However, due to various restrictions, the rescue and repair vehicle does not have extra space to install a towing device, and cannot meet the docking of the rescue and repair vehicle with the follow-up flatbed truck and the towing mission of the damaged vehicle. Summary of the invention

[0003] In view of the above problems, the technical problem to be solved by the present invention is to provide a flatbed truck for transporting a rescue and repair vehicle, which can reliably and conveniently dock with the main vehicle and can safely and stably tow and transport the damaged vehicle.

[0004] The technical solution of the present invention is as follows: A flatbed transport vehicle for a rescue and repair vehicle comprises a frame, a driving device, a braking system and a ladder, wherein the frame is mounted on the driving device, the braking system is mounted at the bottom of the frame and connected to the driving device, the starting and stopping of the flatbed transport vehicle is controlled by the braking system, and the ladder is mounted at the rear of the frame and can be unfolded or folded.

[0005] The frame comprises a frame, a frame panel, and a towing device, wherein the frame panel is mounted on the upper part of the frame, the towing device is mounted on the front end of the frame, and a pulley device is mounted on the upper part of the frame panel;

[0006] The frame adopts a small gooseneck structure, which is welded by a longitudinal beam, a front cross beam, a through beam, a gasket, a side beam, and a taillight beam. The longitudinal beam is welded by an upper wing plate, a lower wing plate, and a web plate of high-strength structural steel, and its cross section is an I-shaped beam. A reinforcing web plate is welded on one side of the web plate at the front end of the longitudinal beam. There are two longitudinal beams, one on the left and one on the right. The through beam is a groove-shaped structure formed by integral stamping. The through beam transversely penetrates the reinforcing web plates at the front ends of the two longitudinal beams and is welded, leaving a gap at the welding point. The front cross beam is welded to the front ends of the two longitudinal beams, and the taillight beam is welded to the rear ends of the two longitudinal beams. Side beams are welded on the left and right sides before the front cross beam and the taillight beam, respectively, and the gasket is welded between the side beam and the longitudinal beam.

[0007] A supporting or retractable supporting device is respectively installed on the left and right sides of the front part of the frame, and a rear support leg is installed at the bottom of the rear end of the frame;

[0008] A suspension device is installed between the frame and the traveling device;

[0009] A towing device for connecting with a rescue and repair vehicle is installed at the front end of the vehicle frame, and the towing device is connected with a towing arm assembly of the rescue and repair vehicle through a latch.

[0010] Furthermore, the frame panel is welded from 3mm thick patterned plates, and creeping ribs are provided on the upper surface of the frame panel to prevent slipping.

[0011] Furthermore, a connecting beam is welded at the rear of the frame. The connecting beam is welded by stamping a V-shaped plate and a cover plate. The connecting beam is evenly welded at the rear of both sides of the left and right longitudinal beams, and a grid-like reinforcing rib is welded between every two adjacent connecting beams.

[0012] Furthermore, the towing device is composed of a connecting frame and a towing groove. The connecting frame is installed on the outer side of the front end of the left and right longitudinal beams, and the towing grooves are installed on the inner side of the left and right longitudinal beams respectively.

[0013] Furthermore, a pulley device is installed at the front and rear ends of the upper part of the frame panel respectively, and the pulley device includes a bracket and a pulley, the bracket is installed on the frame panel through bolts, and the pulley is installed on the bracket through a rotating shaft.

[0014] Furthermore, the supporting device is installed on the left and right sides of the front part of the frame through a swivel pin. The supporting device includes an outer tube, an inner tube, a lifting mechanism and a crank. The lifting mechanism is installed in the outer tube through a fixing pin. A crank is installed on the outer tube, and the crank is connected to the lifting mechanism. The inner tube is sleeved in the outer tube and connected to the lifting mechanism. The inner tube is driven to move up and down in the outer tube through the lifting mechanism. A base is fixedly installed on the bottom of the inner tube, and a support is installed on the side wall of the outer tube. The support is connected to an iron chain. When the vehicle is in driving state, the other end of the iron chain is hung on the frame.

[0015] Furthermore, the driving device is installed at the rear bottom of the frame, including three parallel axles, and two wheel hubs and tires are installed on the left and right ends of each axle respectively. Among them, the first and third axles are installed with ABS end interfaces, and the middle axle does not have an ABS end interface.

[0016] Furthermore, there are two suspension devices, which are respectively installed between the axle of the driving device and the bottom of the frame. Each suspension device includes four mounting frames and three groups of leaf springs. The four mounting frames are evenly installed at the bottom of the frame. The three groups of leaf springs are installed on three axles through three U-shaped bolts. The two ends of each group of leaf springs are installed on two adjacent mounting frames, and each U-shaped bolt is connected to the adjacent mounting frame through a pull rod.

[0017] Based on the above technical solution, the present invention has at least the following beneficial effects compared with the prior art:

[0018] The invention has a simple structure, can be docked with a main vehicle through a connecting device, has quick and convenient operation, and has a reliable and stable connection. By cooperating with a winch on the main vehicle through a pulley block, the damaged vehicle can be safely and reliably dragged onto a rear transport flatbed vehicle for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the frame of the present invention;

[0021] Figure 3 is a top view of the frame panel of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the skeleton in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the longitudinal beam in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the through beam in the present invention;

[0025] Figure 7 It is a schematic diagram of the connection between the longitudinal beam and the through beam in the present invention;

[0026] Figure 8 It is a structural schematic diagram of the connecting beam in the present invention;

[0027] Fig. 9 It is a schematic diagram of the connection between the connecting frame, the towing groove and the longitudinal beam in the present invention;

[0028] Fig.10 It is a structural schematic diagram of the connecting frame in the present invention;

[0029] Fig.11 It is a structural schematic diagram of the pulley device in the present invention;

[0030] Fig.12 yes Fig.11 A cross-sectional view along the longitudinal centerline;

[0031] Fig.13 It is a structural schematic diagram of the suspension device in the present invention;

[0032] Fig.14 It is a structural schematic diagram of the driving device in the present invention;

[0033] Fig.15 is a front view of the support device of the present invention;

[0034] Fig.16 It is a left side view of the supporting device of the present invention;

[0035] Fig.17 It is a schematic structural diagram of the rear outriggers in the present invention;

[0036] Fig.18 It is a schematic diagram of the structure of the pin shaft in the present invention;

[0037] Fig.19 It is a schematic diagram of the connection between the rear delivery flatbed vehicle and the front vehicle towing assembly in the present invention;

[0038] Fig. 20 It is a state diagram of the damaged vehicle towed by the rear transport flatbed truck in the present invention;

[0039] Fig.21 It is a driving state diagram of the present invention;

[0040] Fig. 22 It is a force analysis diagram of the rear delivery flatbed vehicle of the present invention under static operation;

[0041] Fig.23 is a load analysis diagram of the vehicle frame in the present invention;

[0042] Fig.24 is the bending moment diagram of the longitudinal beam in the present invention;

[0043] Fig.25 is a cross-sectional analysis diagram of the longitudinal beam in the present invention;

[0044] Fig.26 It is a force analysis diagram of the ladder in the present invention;

[0045] Fig. 27 It is a force analysis diagram of the connecting frame in the present invention.

[0046] In the figure: 1-frame, 2-driving device, 3-brake system, 4-suspension device, 5-ladder, 6-support device, 7-pulley device, 8-frame panel, 9-traction groove, 10-skeleton, 11-climbing rib, 12-longitudinal beam, 13-front cross beam, 14-through beam, 15-pad groove, 16-side beam, 17-tail light beam, 18-connecting beam, 19-reinforcement rib, 20-upper wing plate, 21-lower wing plate, 22-web plate, 23-reinforced web plate, 24-cover plate, 25-V-shaped plate, 26-connecting Frame, 27- towing groove, 28- bracket, 29- swivel shaft, 30- pulley, 31- rear support leg, 32- inner tube, 33- outer tube, 34- swivel pin, 35- fixing pin, 36- crank, 37- support, 38- chain, 39- lifting mechanism, 40- base, 41- axle, 42- wheel hub and tire, 43- mounting frame, 44- leaf spring, 45- pull rod, 46- U-shaped bolt, 47- latch, 48- towing arm assembly, 49- winch, 50- wire rope, 51- damaged vehicle. DETAILED DESCRIPTION

[0047] The technical solutions of the embodiments of the present invention are described clearly and completely below in conjunction with the drawings of the specification so that those skilled in the art can better understand the technical solutions of the present invention. The embodiments described here are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0048] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "left", "right", "long", "short", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or part referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the present invention, unless otherwise clearly specified or limited, the terms "installation", "fixation", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Figures 1 to 10 As shown, a schematic embodiment of the flatbed transport vehicle for rescue and repair vehicles provided by the present invention is shown. In this schematic embodiment, the flatbed transport vehicle for rescue and repair vehicles includes a frame 1, a driving device 2, a braking system 3 and a ladder 5. The frame 1 is installed on the driving device 2, the braking system 3 is installed at the bottom of the frame 1 and connected to the driving device 2, the towing main vehicle controls the start and stop of the flatbed transport vehicle 3 through the braking system, and the ladder 5 is installed at the rear of the frame and can be unfolded or folded.

[0051] The frame 1 includes a skeleton 10, a frame panel 8, and a towing device 9, which are mainly used to support the load and install the suspension device 4 and the support device 6. The frame panel 8 is installed on the upper part of the skeleton 10, and the towing device 9 is installed on the front end of the skeleton 1. A pulley device 7 is installed on the upper part of the frame panel 8. The towing device 9 is composed of a connecting frame 26 and a towing groove 27. The connecting frame 26 is installed on the outer side of the front end of the left and right longitudinal beams 12, and the towing grooves 27 are installed on the inner side of the left and right longitudinal beams 12 respectively. The frame panel 8 is welded from a 3mm thick patterned plate, and a creeping rib 11 is provided on the upper surface of the frame panel 8 to prevent slipping, so as to enhance the contact force of damaged or faulty equipment on the rear transport flatbed.

[0052] The frame 10 adopts a small gooseneck structure, which is welded by a longitudinal beam 12, a front cross beam 13, a through beam 14, a gasket 15, a side beam 16, and a taillight beam 17. Among them, the longitudinal beam 12 is welded by an upper wing plate 20, a lower wing plate 21, and a web plate 22 of high-strength structural steel, and its cross section is an I-shaped. A reinforcing web plate 23 is welded on one side of the web plate 22 at the front end of the longitudinal beam 12, and there are two longitudinal beams 12 on the left and right. The through beam 14 is a groove-shaped structure formed by integral stamping. The through beam 14 transversely penetrates the reinforcing web plates 22 at the front ends of the two longitudinal beams 12 and is welded. It is not welded with the upper wing plate 20 and the lower wing plate 21, and a gap is left at the welding point. When the longitudinal beam 12 is bent and deformed, the longitudinal beam 12 is allowed to have a slight displacement relative to the through beam 14, thereby eliminating the stress concentration phenomenon. At the same time, due to the large bearing capacity of the reinforcing web plate, when the eccentric load is large, the stress generated in various parts of the frame 1 can be distributed more evenly. The front cross beam 13 is welded to the front end of the two longitudinal beams 12, the tail light beam 17 is welded to the rear end of the two longitudinal beams 12, the side beams 16 are welded to the left and right sides before the front cross beam 13 and the tail light beam 17, and the pad groove 15 is welded between the side beam 16 and the longitudinal beam 12. A connecting beam 18 is welded to the rear of the frame 10. The connecting beam 18 is welded by a stamped V-shaped plate 25 and a cover plate 24. The connecting beams 18 are welded to the rear of the left and right longitudinal beams 12 at even intervals. A grid-shaped reinforcing rib 19 is welded between each two adjacent connecting beams 18 to improve the rigidity between the connecting beams 18 and prevent the tires from being parked between the connecting beams 18 when the damaged vehicle is loaded.

[0053] A supporting or retractable supporting device 6 is installed on the left and right sides of the front of the frame 1, and a rear support leg 31 is installed at the bottom of the rear end of the frame. Fig.17 As shown, the rear legs 31 are hinged to the rear of the frame 1, and an iron chain is installed on the rear legs 31. When driving, the rear legs 31 are folded and hung on the frame 1 through the iron chain. When loading or unloading a damaged vehicle, the iron chain is loosened, and the rear legs 31 are supported on the ground to provide stable support for the rear transport flatbed, so as to reduce the load on the axle and prevent the flatbed truck from tilting.

[0054] A suspension device 4 is installed between the vehicle frame 1 and the driving device 2 .

[0055] A towing device 9 for connecting to a rescue and repair vehicle is installed at the front end of the vehicle frame 1 . The towing device 9 is connected to a towing arm assembly 48 of the rescue and repair vehicle via a latch 47 .

[0056] When the main vehicle is docked with the rear delivery flatbed vehicle, the support device 6 is lowered to place the rear delivery flatbed vehicle stably, the main vehicle is reversed, the towing arm assembly 48 is inserted into the appropriate position of the towing groove 27, and the latch 47 is inserted into the hole of the connecting frame 26 to complete the docking of the main vehicle and the rear delivery flatbed vehicle. Fig.18 , 19 shown.

[0057] like Fig. 20 As shown, when towing a damaged vehicle, a steel wire rope 50 extending from a winch 49 installed on the main vehicle passes through the front and rear pulley devices 7 and is connected to the damaged vehicle 51. Starting the winch 49 can achieve stable output pulling force, and the damaged vehicle 51 can be towed to the rear flatbed truck to complete the towing task.

[0058] The damaged vehicle 51 is towed onto the rear transport flatbed truck and then the main vehicle can pull the damaged vehicle to the designated location. The driving status diagram is as follows: Fig.21 shown.

[0059] like Fig.11 , 12 As shown, in the schematic embodiment of the transport flatbed truck for the rescue and repair vehicle provided by the present invention, a pulley device 7 is respectively installed at the front and rear ends of the upper part of the frame panel 8, and the pulley device 7 includes a bracket 28 and a pulley 30. The bracket 28 is installed on the frame panel 8 by bolts, and the pulley 30 is installed on the bracket 28 by a rotating shaft 29. When towing a damaged or faulty vehicle, the pulley device 7 serves as a transition device between the towing device and the towing point of the damaged vehicle.

[0060] like Fig.15 , 16 As shown, in the schematic embodiment of the flatbed truck for rescue and repair vehicles provided by the present invention, the support device 6 is installed on the left and right sides of the front part of the frame 1 through the swivel pin 34, and the support device 6 includes an outer tube 33, an inner tube 32, a lifting mechanism 39 and a crank 36. The lifting mechanism 39 is installed in the outer tube 33 through the fixing pin 35. A crank 36 is installed on the outer tube 33, and the crank 36 is connected to the lifting mechanism 39. The inner tube 32 is sleeved in the outer tube 33 and connected to the lifting mechanism 39. The inner tube 32 is driven to move up and down in the outer tube 33 through the lifting mechanism 39. A base 40 is fixedly installed at the bottom of the inner tube 32, and a support 37 is installed on the side wall of the outer tube 33. The support 37 is connected to an iron chain 38. When the vehicle is in the driving state, the other end of the iron chain is hung on the frame 1. The support device 6 is used to support the flatbed truck in the non-traction state, and provide stable support for the flatbed truck in the loading and unloading process to reduce the load of the axle and prevent the flatbed truck from tilting. The lifting load of the supporting device 6 is 28t / support, the static load is 30t / support, the high gear is 8.5mm / r, and the low gear is 0.95mm / r.

[0061] like Fig.14As shown, in the schematic embodiment of the rear transport flatbed truck for the rescue and repair vehicle provided by the present invention, the driving device 2 is used to support the frame and the weight of the cargo, is installed at the rear bottom of the frame 1, and includes three parallel axles 41, and each axle 41 is respectively equipped with two wheel hubs and tires 42 at the left and right ends, with a total of 3 axles, 12 wheel hubs and tires, wherein the first and third axles are equipped with ABS end interfaces, and the middle axle does not have an ABS end interface.

[0062] like Fig.13 As shown, in the schematic embodiment of the rescue and repair vehicle rear transport flatbed provided by the present invention, there are two suspension devices 4, which are used to transmit the force between the wheels and the frame, buffer the impact of the road surface, attenuate vibration, and ensure the smooth travel of the rear transport flatbed. The suspension devices 4 are respectively installed between the axle 41 of the driving device 2 and the bottom of the frame 1. Each suspension device 4 includes four mounting frames 43 and three groups of leaf springs 44. The four mounting frames 43 are evenly installed at the bottom of the frame 1. The three groups of leaf springs 44 are respectively installed on the three axles 41 through three U-shaped bolts 46. The two ends of each group of leaf springs 44 are installed on two adjacent mounting frames 43. Each U-shaped bolt 46 is connected to the adjacent mounting frame through a pull rod 45.

[0063] Taking the rear delivery flatbed truck with a curb weight of 9500Kg and a load-bearing mass of 30000Kg as an example, the main components of the rear delivery flatbed truck of the present invention are analyzed and calculated:

[0064] like Fig. 22 As shown in the figure, (1) the analysis and calculation are carried out with the flatbed truck as the object:

[0065] According to the static balance analysis, we can know that:

[0066]

[0067]

[0068] Where:

[0069]

[0070]

[0071]

[0072] Knowable ,

[0073] It can be concluded that the static load of the two supporting devices 6 is 28t / support, which meets the requirements.

[0074] like Fig.23 As shown, (2) analyze the frame load:

[0075]

[0076]

[0077] From the static equilibrium equation we know that:

[0078] When no load:

[0079]

[0080] Right now

[0081] When fully loaded:

[0082]

[0083]

[0084] Right now

[0085]

[0086] Where:

[0087]

[0088]

[0089]

[0090] Shear force calculation

[0091] CA segment:

[0092] AE segment:

[0093] EB segment:

[0094] BD segment:

[0095] Bending moment calculation

[0096] CA segment:

[0097] AE segment:

[0098] EB segment:

[0099] BD segment:

[0100] It can be seen that the maximum bending moment at each point is:

[0101] Maximum bending moment at point A:

[0102] Maximum bending moment at point E:

[0103] Maximum bending moment at point B:

[0104] The bending moment diagram of the longitudinal beam is as follows Fig.24 shown.

[0105] (3) Calculate the bending moment diagram of the longitudinal beam and determine its dangerous section:

[0106] The dangerous sections of the longitudinal beam are the variable section and the maximum bending moment. Through the bending moment diagram and calculation, it can be known that the distance between the dangerous section and the front end of the longitudinal beam is: 2980mm and 8086mm.

[0107] The cross-sectional dimensions at each section are as follows Fig.25 As shown,

[0108] Section 1

[0109] Section 2

[0110] Bending section coefficient:

[0111]

[0112]

[0113]

[0114] Bending moment at each section:

[0115] M(1)=115107N·m

[0116] M(2)=529548N·m

[0117]

[0118]

[0119]

[0120] Shear stress:

[0121] Depend on

[0122]

[0123]

[0124]

[0125] Since the longitudinal beam is subjected to shear force and bending moment at the same time, its stress should be calculated according to the following formula:

[0126]

[0127] Allowable stress:

[0128] Where:

[0129]

[0130]

[0131] The rear delivery flatbed trucks of the present invention are all made of high-strength steel.

[0132] It can be seen that:

[0133] According to the fourth strength theory, the strength of each section is checked separately:

[0134] Section 1:

[0135] Section 2:

[0136] Therefore, it is concluded that the longitudinal beam strength meets the requirements.

[0137] (4) Check the force analysis and strength of the axle:

[0138] Without calculating the suspension spring load, it can be known from the above calculation that when statically loaded, the axle is subjected to a force of 291407N, and when fully loaded, the axle is subjected to a force of 311881N. When selecting the rear transport flatbed truck of the present invention, the rated load of the axle is 13t / axle, which meets the requirements.

[0139] (5) Ladder force analysis and strength verification:

[0140] like Fig.26 The figure shows the damaged vehicle passing through the ladder when being towed to the transport flatbed truck, and is located in the middle of the ladder. It is assumed that the gravity of the damaged vehicle is fully applied to the ladder.

[0141] From the mechanical balance we know that:

[0142]

[0143]

[0144]

[0145]

[0146] We can get:

[0147] The transport flatbed vehicle of the present invention comprises two ladders, so a single ladder can carry .

[0148] Through finite element analysis, the maximum deformation of the ladder is 0.4mm, the maximum stress is 630MPa, and the ladder is made of high-strength steel plates to meet the strength requirements.

[0149] (6) Stress analysis and strength verification of the connecting shaft between the ladder and the frame:

[0150] When the damaged vehicle is in the middle of the ladder, the vertical force on the single axis connecting the ladder and the frame is , the horizontal direction is .

[0151] The total force on the connecting shaft is: 27530N.

[0152] Through finite element analysis, the maximum deformation of the frame connecting shaft is 0.03mm, the maximum stress is 55MPa, and the connecting shaft is made of 45 steel with a yield strength of 355MPa, which meets the strength requirements.

[0153] (7) Stress analysis and strength calculation of the connecting frame

[0154] The connecting frame plays a vital role as the connecting device between the main vehicle and the rear transport flatbed vehicle. When in the marching state, the force analysis of the connecting frame is as follows: Fig. 27 As shown:

[0155] In the figure:

[0156]

[0157] It can be seen that: Take the friction coefficient μ as 2

[0158] It can be seen that: =79000N

[0159] The present invention adopts two connecting frames, so the force of a single connecting frame is 39500N.

[0160] Through finite element analysis, the maximum deformation of the connecting frame is 0.2mm, the maximum stress is 250MPa, and the connecting frame is made of 700L high-strength steel plate to meet the strength requirements.

[0161] The invention has a simple structure, can be docked with a main vehicle through a connecting device, has quick and convenient operation, and has a reliable and stable connection. By cooperating with a winch on the main vehicle through a pulley block, the damaged vehicle can be safely and reliably dragged onto a rear transport flatbed vehicle for transportation.

[0162] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flatbed truck for rescue and repair vehicles, including a frame, driving device, brake system and ladder, The frame is mounted on a driving device, which is located at the rear bottom of the frame and includes three parallel axles, each of which has two wheels and tires mounted on the left and right ends. The first and third axles are equipped with ABS end interfaces, the middle axle is not equipped with ABS end interfaces, and a suspension device is installed between the frame and the driving device; The frame includes a frame, a frame panel, and a towing device. The frame panel is installed on the upper part of the frame. The towing device is installed at the front end of the frame for connecting with the rescue and repair vehicle. The towing device is connected to the towing arm assembly of the rescue and repair vehicle through a latch. A pulley device is installed on the upper part of the frame panel. A supporting or retractable supporting device is respectively installed on the left and right sides of the front part of the frame, and a rear support leg is installed at the bottom of the rear end of the frame; The braking system is installed at the bottom of the frame and connected to the driving device. The start and stop of the rear transport flatbed truck are controlled by the braking system. The ladder is installed at the rear of the frame and can be unfolded or folded. Features: The skeleton adopts a small gooseneck structure, which is welded by a longitudinal beam, a front cross beam, a through beam, a gasket, a side beam, and a taillight beam, wherein the longitudinal beam is welded by an upper wing plate, a lower wing plate, and a web plate of high-strength structural steel, and its cross-section is an I-shape, and a reinforcing web is welded on one side of the web plate at the front end of the longitudinal beam. There are two longitudinal beams, left and right; the through beam is a groove-shaped structure formed by integral stamping, and the through beam transversely penetrates the reinforcing webs at the front ends of the two longitudinal beams and is welded, leaving a gap at the welding point; the front cross beam is welded to the front ends of the two longitudinal beams, and the taillight beam is welded to the rear ends of the two longitudinal beams, and side beams are respectively welded on the left and right sides before the front cross beam and the taillight beam, and the gasket is welded between the side beam and the longitudinal beam, and a connecting beam is welded at the rear of the skeleton, and the connecting beam is welded by a stamped V-shaped plate and a cover plate, and the connecting beams are evenly welded at the rear ends of the left and right longitudinal beams, and a grid-shaped reinforcing rib is welded between every two adjacent connecting beams.

2. The flatbed truck for transporting a rescue and repair vehicle as claimed in claim 1, characterized in that: The frame panel is welded from 3mm thick patterned plates, and a creeping rib is provided on the upper surface of the frame panel to prevent slipping.

3. The flatbed truck for transporting a rescue and repair vehicle as claimed in claim 1, characterized in that: The towing device is composed of a connecting frame and a towing groove. The connecting frame is installed on the outer side of the front end of the left and right longitudinal beams, and the towing grooves are respectively installed on the inner side of the left and right longitudinal beams.

4. The flatbed truck for transporting a rescue and repair vehicle as claimed in claim 1, characterized in that: A pulley device is respectively installed at the front and rear ends of the upper part of the frame panel. The pulley device comprises a bracket and a pulley. The bracket is installed on the frame panel through bolts, and the pulley is installed on the bracket through a rotating shaft.

5. The flatbed truck for transporting a rescue and repair vehicle as claimed in claim 1, characterized in that: The supporting device is installed on the left and right sides of the front part of the frame through a swivel pin. The supporting device includes an outer tube, an inner tube, a lifting mechanism and a crank. The lifting mechanism is installed in the outer tube through a fixing pin. A crank is installed on the outer tube, and the crank is connected to the lifting mechanism. The inner tube is sleeved in the outer tube and connected to the lifting mechanism. The inner tube is driven to move up and down in the outer tube through the lifting mechanism. A base is fixedly installed at the bottom of the inner tube, and a support is installed on the side wall of the outer tube. The support is connected to an iron chain. When the vehicle is in driving state, the other end of the iron chain is hung on the frame.

6. The flatbed truck for transporting a rescue and repair vehicle as claimed in claim 1, characterized in that: There are two suspension devices, which are respectively installed between the axle of the driving device and the bottom of the frame. Each suspension device includes four mounting frames and three groups of leaf springs. The four mounting frames are evenly installed at the bottom of the frame. The three groups of leaf springs are installed on three axles through three U-shaped bolts. The two ends of each group of leaf springs are installed on two adjacent mounting frames, and each U-shaped bolt is connected to the adjacent mounting frame through a pull rod.

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