A transport vehicle with a carriage lifting material handling function

Abstract

The present application belongs to the field of vehicle transportation technology, and particularly relates to a transport vehicle with a carriage lifting and material handling function. The present application comprises a vehicle head and a carriage, the carriage is provided with rear wheels, the vehicle head and the carriage are connected to each other through upper and lower connecting rods, the upper connecting rod, the rear part of the vehicle head, the lower connecting rod and the front part of the carriage jointly form a parallel four-bar linkage mechanism; one end of the lower connecting rod which is horizontally hinged to the carriage is arranged with an extension arm, the extension arm is parallel to the action direction of the parallel four-bar linkage mechanism in the length direction; the two ends of the middle connecting rod are respectively horizontally hinged to the extension end of the extension arm and the power end of the tail connecting rod, and the hinged axes are parallel to the hinged axes of the parallel four-bar linkage mechanism; the tail connecting rod is horizontally hinged to one side of the bottom of the carriage, and the working end of the tail connecting rod is installed with the rear wheels. The present application can realize the controllable lifting effect of the carriage height, so that the loading and unloading height can be conveniently lowered according to the requirements during loading and unloading, and the operation is flexible and convenient.

Description

[0001] This application claims priority to application number 202323207954.3 filed on November 24, 2023, entitled "A transport vehicle with a lifting and material handling function in a carriage", the original receiving agency of which was the China National Intellectual Property Administration. Technical Field

[0002] This invention belongs to the field of vehicle transportation technology, and specifically relates to a transport vehicle with a cargo box lifting and material handling function. Background Technology

[0003] Currently, the cargo compartments of transport vehicles are fixed to the chassis to meet the transportation needs of goods. However, during loading and unloading, the chassis's height above the ground is obviously unfavorable for operations. Current solutions include: for small-scale manual handling, inclined ramps are often used; for bulk handling by enterprises, dedicated elevated platforms are pre-cast, with the platform's height equal to the chassis's height, thus achieving mechanized transport. Regardless of the method used, additional costs are unavoidable; more importantly, inclined ramps are inconvenient and dangerous; and elevated platforms require a single, fixed location for transport, lacking portability. In this regard, existing technologies do indeed include designs that allow for adjustable cargo box height to facilitate cargo transport, such as patent number "CN202465184U" entitled "A Liftable Vehicle-Mounted Cargo Box," patent number "CN219134394U" entitled "An Agricultural Unloading Liftable Electric Vehicle Cargo Box," and patent number "CN109572515A" entitled "A Height-Adjustable Unloading Cargo Box." However, these designs still do not solve the problem of "excessive loading and unloading height." That is, the current design concept still maintains the height of the chassis frame, achieving the goal of "further increasing the loading and unloading height," which obviously contradicts the idea of ​​"reducing the loading and unloading height" that those skilled in the art would expect. Therefore, this issue urgently needs to be addressed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a transport vehicle with a lifting and material handling function, which can achieve a controllable lifting effect of the cargo compartment height, so that the loading and unloading height can be conveniently lowered as needed during loading and unloading, and the operation is flexible and convenient.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A transport vehicle with a lifting and material handling function includes a cab and a cargo box located behind the cab. Rear wheels are installed in the cargo box. The vehicle is characterized in that: the cab and cargo box are independent of each other but connected by an upper and lower linkage. The upper linkage, the rear of the cab, the lower linkage, and the front of the cargo box together form a parallel four-bar linkage mechanism. This parallel four-bar linkage mechanism is driven by a power source to cause the cargo box to lift. An extension arm is arranged at one end of the lower linkage that is horizontally hinged to the cargo box, and the length direction of the extension arm is parallel to the direction of movement of the parallel four-bar linkage mechanism. The two ends of the middle linkage are horizontally hinged to the extension ends of the extension arm and the power end of the tail linkage, respectively, and the hinge axis is parallel to the hinge axis of the parallel four-bar linkage mechanism. The tail linkage is horizontally hinged to one side of the bottom of the cargo box, and the working end of the tail linkage is equipped with the rear wheels.

[0007] Preferably, the extension arm has a downward-facing angle with the lower connecting rod.

[0008] Preferably, the tail link is divided into an upper link and a lower link, with the hinge point between the tail link and the car body as the boundary. The upper link and the lower link intersect each other and form an angle with the opening facing backward.

[0009] Preferably, the extension arm and the lower connecting rod, as well as the upper rod and the lower rod, are connected to each other by bolt fastening.

[0010] Preferably, the intermediate connecting rod is a threaded sleeve type telescopic structure formed by combining a threaded sleeve at the beginning, an intermediate screw, and a threaded sleeve at the end.

[0011] Preferably, the front of the vehicle includes a front frame, which is L-shaped, and the vertical section of the front frame forms one of the links of the parallel four-bar linkage; the power source is a piston cylinder, the cylinder wall of the power source is horizontally hinged to the front frame, and the piston rod of the power source is horizontally hinged to a horizontal plate extending horizontally from the top of the vehicle body; the axes of each hinged part of the power source are parallel to the hinge axis of the parallel four-bar linkage.

[0012] Preferably, the power source is a motor, and the drive shaft of the power source forms a power engagement with one of the hinge ends of the upper or lower connecting rod, thereby driving the corresponding connecting rod to produce a swinging motion around the axis of the corresponding hinge end.

[0013] The beneficial effects of this invention are as follows:

[0014] 1) The above solution eliminates the need for a chassis frame, or integrates the chassis frame with the cargo box, directly combining the upper linkage, rear of the front, lower linkage, and front of the cargo box to form a parallel four-bar linkage mechanism. This enables controllable lifting of the cargo box relative to the front of the vehicle, until the cargo box reaches the desired height. Furthermore, the extension arm at the lower linkage, the middle linkage, the rear linkage, and the cargo box together form another four-bar linkage mechanism, ensuring the linkage function of the rear wheels. During operation, once the cargo box descends, the first parallel four-bar linkage mechanism activates, which, through the extension arm, drives the second four-bar linkage mechanism to follow suit, causing the rear wheels to rise while the cargo box descends, and vice versa. This ensures controllable lifting of the cargo box, with the lowest point slightly above or even flush with the ground, while also guaranteeing the uniqueness of the rear wheel height, avoiding excessive or unequal height differences between the front and rear wheels – a multi-benefit approach.

[0015] Thus, this invention enables controllable raising and lowering of the cargo compartment height, allowing for convenient and flexible lowering of the loading and unloading height as needed during loading and unloading.

[0016] 2) Considering the height correspondence between the rear wheels and the front wheels at the front of the vehicle, it is recommended that the extension arm be an angled structure, that is, at an angle to the lower linkage. This ensures high efficiency of rear wheel linkage while preventing the middle linkage from being too high. Similarly, the tail linkage can also be arranged at a certain angle, which also facilitates the rapid raising and lowering of the rear wheels. During the design process, the specific angle can be adjusted to meet the requirements.

[0017] If necessary, it can even be specially adjusted so that when the cargo compartment is in a low position, the height of the rear wheels is slightly higher or slightly lower than the height of the front wheels, so that the bottom of the cargo compartment can be slightly inclined forward or backward depending on the type of cargo, in order to improve loading efficiency and even loading safety.

[0018] 3) The intermediate connecting rod is a telescopic component, which aims to improve the efficiency of debugging and ultimately ensure the reliability of the whole machine.

[0019] 4) Regarding the selection of the power source, there are various options, such as a motor, a piston cylinder, or even other known power structures, as long as they can achieve the coordinated action of the vehicle body lifting and the parallel four-bar linkage. This invention preferably uses a piston cylinder because of its enormous kinetic energy, and the fact that its hydraulic system is compatible with the vehicle's hydraulic system, offering better cost-effectiveness. Of course, if a motor is used, it is only necessary to ensure that the motor can drive one set of links in the parallel four-bar linkage, which is suitable for use in electric vehicle onboard systems. Attached Figure Description

[0020] Figure 1A schematic diagram of the structure of the present invention when the carriage is in a high position;

[0021] Figure 2 A schematic diagram illustrating the working state of the present invention when the carriage is in an intermediate changing state;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention when the carriage is in a low position.

[0023] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0024] 10-Locomotive head; 11-Front frame; 20-Carriage box; 21-Leveling plate; 30-Rear wheel;

[0025] 41 - Upper link; 42 - Lower link;

[0026] 51-Extending arm; 52-Intermediate link; 53-Tail link; 53a-Upper rod; 53b-Lower rod;

[0027] 60 - Power source. Detailed Implementation

[0028] For ease of understanding, this section combines... Figure 1-3 The specific structure and operation of the present invention are further described below:

[0029] like Figure 1 As shown, the specific embodiment of the present invention includes a front end 10 with a front frame 11 and an "L"-shaped cargo box 20 located at the rear of the front end 10; the front wheels are arranged at the front frame 11, and the rear wheels 30 are arranged at the cargo box 20, or the rear frame. The vehicle chassis can be directly integrated with the cargo box 20 to realize the dual functions of cargo carrying and load-bearing of the cargo box 20. Wherein:

[0030] The upper link 41 and the lower link 42 are parallel to each other, and as shown in the figure. Figure 1 The horizontal hinge shown is connected to the front of the carriage 20 and the vertical section of the front frame 11, thereby assembling the front of the carriage 20, the upper link 41, the vertical section, and the lower link 42 to form a structure as shown. Figure 1-3 The parallel four-bar linkage structure is shown. At this point, once the piston cylinder located on the front frame 11 produces... Figure 2 When the return motion is shown, the carriage 20 will descend due to the presence of the parallel four-bar linkage; conversely, the carriage 20 will rise.

[0031] Furthermore, by Figure 1It can be seen that the lower link 42 itself has an extension arm 51, the purpose of which is to form the power arm of the second set of four-bar linkage. At this time, the extension arm 51, the middle link 52, the upper rod body 53a of the tail link 53, and the carriage 20 work together to form a four-bar linkage. Once the extension arm 51 swings due to the lifting and lowering of the carriage 20, it acts as a power arm, driving the four-bar linkage to produce a follow-up action. Since the rear wheel 30 is installed at the lower rod body 53b of the tail link 53, the rear wheel 30 can generate... Figure 1-3 The upward movement shown can be reversed to produce a downward movement of the rear wheels 30.

[0032] Considering adjustability, the intermediate connecting rod 52 can be a threaded sleeve-type telescopic structure formed by combining a threaded sleeve at the front end, a threaded rod in the middle, and a threaded sleeve at the rear end. The extension arm 51 and the lower connecting rod 42, as well as the upper rod body 53a and the lower rod body 53b, can be connected to each other by bolt fastening. The purpose is to allow for online adjustment of the included angles at any time by tightening or loosening the bolts, ultimately ensuring that the rear wheel 30 is always at the required working height.

[0033] In actual driving, the kinetic energy source can be a hydraulic cylinder or an electric motor, etc.; Figure 1-3 The power source 60 uses a piston cylinder, specifically a hydraulic cylinder, to match a conventional vehicle-mounted hydraulic system, ultimately achieving the best cost-effectiveness. The piston cylinder's two ends need to be hinged to the front frame 11 and the cargo box 20 respectively; if necessary, it can be... Figure 1 As shown, a horizontal plate 21 extends from the carriage 20 to ensure convenient assembly and reliable driving performance. Of course, if the object is an electric vehicle, the power source 60 can be a motor, etc., which will not be elaborated here.

[0034] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar methods that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0036] All technical parts not described in detail in this invention are publicly known technologies.

Claims

1. A transport vehicle with a lifting and material handling function, comprising a cab (10) and a cargo box (20) located behind the cab (10), wherein rear wheels (30) are provided at the cargo box (20), characterized in that: The front (10) and the carriage (20) are independent of each other and connected by an upper link (41) and a lower link (42). The upper link (41), the rear of the front (10), the lower link (42), and the front of the carriage (20) together form a parallel four-bar linkage. This parallel four-bar linkage is driven by a power source (60) to drive the carriage (20) to move up and down. An extension arm (51) is arranged at one end of the lower link (42) that is horizontally hinged to the carriage (20). The length of the extension arm (51) is parallel to the direction of movement of the parallel four-bar linkage. The two ends of the middle link (52) are horizontally hinged to the extension arms (51). The extension end and the power end of the tail link (53) are connected, and the hinge axis is parallel to the hinge axis of the parallel four-bar linkage. The tail link (53) is horizontally hinged to one side of the bottom of the carriage (20), and the working end of the tail link (53) is equipped with the rear wheel (30). Taking the hinge point formed between the tail link (53) and the carriage (20) as the boundary, the tail link (53) is divided into an upper rod body (53a) and a lower rod body (53b). The upper rod body (53a) and the lower rod body (53b) intersect each other and form an angle with the opening facing backward. The rear wheel (30) is installed at the lower rod body (53b) to ensure the uniqueness of the height of the rear wheel (30).

2. A transport vehicle with a cargo box lifting and material handling function according to claim 1, characterized in that: The extension arm (51) has a downward-facing angle with the lower connecting rod (42).

3. A transport vehicle with a cargo box lifting and material handling function according to claim 1, characterized in that: The extension arm (51) and the lower connecting rod (42) are connected to each other by bolt fastening, as are the upper rod body (53a) and the lower rod body (53b).

4. A transport vehicle with a cargo box lifting and material handling function according to claim 1, 2, or 3, characterized in that: The intermediate connecting rod (52) is a threaded sleeve type telescopic structure formed by the combination of the first end threaded sleeve, the intermediate screw and the tail end threaded sleeve.

5. A transport vehicle with a cargo box lifting and material handling function according to claim 1, 2, or 3, characterized in that: The front of the vehicle (10) includes a front frame (11), which is L-shaped. The vertical section of the front frame (11) forms one of the links of the parallel four-bar linkage. The power source (60) is a piston cylinder. The cylinder wall of the power source (60) is horizontally hinged to the front frame (11), and the piston rod of the power source (60) is horizontally hinged to the horizontal plate (21) extending horizontally from the top of the carriage (20). The axes of each hinged part of the power source (60) are parallel to the hinge axis of the parallel four-bar linkage.

6. A transport vehicle with a cargo box lifting and material handling function according to claim 1, 2, or 3, characterized in that: The power source (60) is a power motor. The drive shaft of the power source forms a power engagement with one of the hinge ends of the upper connecting rod (41) or the lower connecting rod (42), thereby driving the corresponding connecting rod to generate a swinging motion around the axis of the corresponding hinge end.

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