Belt tension adjustment unit of a cargo loading / unloading device installed on a top car

Abstract

The present invention relates to a belt tension adjustment unit for a cargo loading and unloading device installed on a box truck. It enables convenient loading and unloading of goods without a worker having to climb onto or off the vehicle. By cutting the conveyor belt used for loading and unloading to a length corresponding to half to 60% of the length of the infinitely rotating, expensive conveyor belt on which the cargo is loaded and horizontally transported, it is possible to reduce the cost of the expensive conveyor belt. Furthermore, by adjusting the tension of the conveyor belt cut to the length used for loading and unloading through the belt tension adjustment unit and a wire member, smooth operation of the cargo loading and unloading is ensured, and malfunctions of the cargo loading and unloading device or damage to the cargo loaded on the conveyor belt caused by tension reduction can be prevented. Additionally, by using a conveyor belt cut to the length used for loading and unloading, components such as the transfer roller and drive roller of the loading and unloading transport means are exposed to the outside through the forward and backward movement of the conveyor belt, making it easy to detect damage, defects, or breakage of the components. The present invention relates to a belt tension adjustment unit for a cargo loading and unloading device installed in a truck, which can solve odor generation or hygiene problems by making maintenance easy through a roller frame that is easy to find and replace, and making it easy to remove contaminants such as dust, foreign matter, and dirt.

Description

Technology Field

[0001] The present invention relates to a belt tension adjustment unit for a cargo loading and unloading device installed in a truck, and more specifically, to a belt tension adjustment unit for a cargo loading and unloading device installed in a truck that allows for convenient loading and unloading without a worker having to get on or off the vehicle to load and unload goods loaded in the truck, wherein a conveyor belt on which cargo is loaded and horizontally transported is cut to the length used for loading and unloading cargo, and the tension of the cut conveyor belt is adjusted through a belt tension adjustment unit and a tension member to ensure smooth operation of cargo loading and unloading, prevent damage or breakage of the cargo loading and unloading device and cargo due to a decrease in tension of the loading and unloading transport means, and furthermore, allows for easy maintenance of the tension adjustment. Background Technology

[0003] Generally, cargo trucks are vehicles used to transport goods, and recently, with the development of e-commerce and special circumstances such as the COVID-19 pandemic, the delivery of goods via courier services is increasing.

[0005] Cargo delivered via such courier is typically loaded onto a cargo truck for transport and delivery. This involves a series of processes, including loading the cargo onto the truck, transporting it to the delivery location, unloading it upon arrival, and delivering it to the consumer.

[0007] These trucks are typically divided into a driver's compartment with a driver's seat and a cargo compartment for loading cargo. Here, trucks are classified into those with an open cargo compartment and those with a closed, box-shaped cargo compartment. In the case of the former, trucks with an open cargo compartment, the cargo is exposed within the compartment, allowing for easy unloading without having to specifically designate a location for the cargo, as the location of the cargo loaded within the compartment can be accurately identified.

[0009] Next, there are cargo trucks with enclosed cargo compartments. These enclosed cargo trucks feature a box-shaped cargo compartment and are referred to as "top trucks" in Korea and "box trucks" in the United States and elsewhere. These enclosed cargo trucks (hereinafter referred to as "top trucks") are equipped with a rectangular, sealed cargo compartment featuring doors that open on the sides or rear, allowing for the safe transport and unloading of cargo regardless of changes in external weather conditions.

[0011] However, in order to load and unload cargo from such trucks, workers had to repeatedly enter and exit the enclosed cargo compartment one by one; furthermore, when transporting the cargo to a delivery area, the worker had to get out of the driver's seat, open the door of the enclosed cargo compartment, enter the sealed cargo area to retrieve the goods to be delivered, unload them from the compartment, and then hand them over to the consumer.

[0013] As such, to make it easier for workers to retrieve cargo loaded in the closed cargo compartment, a method is adopted to efficiently load and unload goods by placing cargo for the last delivery area inside the compartment and cargo for the first delivery area towards the rear door; however, even with this loading method, the inconvenience of workers having to repeatedly enter and exit the compartment and the increased time required for unloading cargo are not significantly different.

[0015] In addition, delivery drivers who transport and deliver cargo also face the problem of frequent safety accidents caused by strenuous physical labor.

[0017] Therefore, while it is desirable for cargo delivery using trucks to be carried out by a team of two for loading and unloading, this is not economically viable as it leads to increased transportation costs resulting from rising labor and incidental expenses. Consequently, a single worker (delivery driver) typically performs multiple roles such as loading, unloading, delivery, and transportation, which leads to issues such as misdelivery or damage to cargo during delivery. Furthermore, this problem can result in the passing on of unnecessary costs to consumers.

[0019] Accordingly, a cargo loading and unloading device for a cargo truck is being introduced that can minimize the physical burden on workers (delivery drivers) caused by loading and unloading cargo onto and off the truck, and prevent damage or breakage of the cargo.

[0021] Technologies disclosed as cargo loading and unloading devices for cargo trucks include Korean Registered Patent No. 10-2435564, registered date August 18, 2022, cargo loading and unloading device for cargo trucks, and Korean Registered Patent No. 10-1166206, registered date July 10, 2012, cargo loading and unloading device for cargo trucks.

[0023] The conventional cargo loading and unloading device for a truck disclosed above is configured with a conveyor belt driven by a drive unit, and is configured to facilitate the loading and unloading of cargo according to the drive of the conveyor belt.

[0025] However, if we look at the configuration of this conveyor belt, it is configured to rotate infinitely due to its characteristics, and the conveyor belt is driven to move horizontally by operating through forward and reverse rotation in the drive unit during loading and unloading.

[0027] Here, the conveyor belt is typically composed of flexible materials such as synthetic rubber or synthetic resin, configured to receive driving force suitable for an endless rotational trajectory.

[0029] Such conveyor belts are typically configured to rotate infinitely by being coupled with idle rollers and drive rollers, and are maintained taut by adjusting the tension to facilitate the transmission of driving force.

[0031] However, even if the conveyor belt is configured to rotate infinitely by adjusting its tension, if used for a long time, the conveyor belt stretches due to various factors, and the tension of the conveyor belt connected to the roller decreases, causing a problem where the conveyor belt does not properly receive the driving force.

[0033] When a load-bearing item, such as the cargo loading / unloading device mentioned above, is placed on an extended conveyor belt, the conveyor may not be level and may become deformed by overlapping and crushing each other, causing problems with the transmission of driving force. Consequently, the conveyor may not operate at a constant speed for a certain distance but instead receive driving force at intervals, which may result in impact to the cargo.

[0035] Furthermore, when a load is applied to an extended conveyor belt, problems such as the cargo getting tangled between the rollers cause the cargo to sway up and down and move horizontally, resulting in external impacts that damage the cargo or make the proper transport of the loaded cargo impossible.

[0037] Meanwhile, when examining the driving distance of the conveyor belt of the conventional cargo loading and unloading device described above, the entire conveyor belt is not involved in the horizontal movement of the cargo, and only half of the conveyor belt is involved in the direct horizontal movement of the cargo. In fact, the lower part of the conveyor belt, other than the upper part of the conveyor belt which rotates infinitely, only transmits the driving force for the horizontal transport of the cargo and is not used for horizontal movement through direct contact.

[0039] In other words, unnecessary costs are increasing due to the problem that the entire expensive conveyor belt must be assembled even though it is not being used. In fact, as previously mentioned, if the tension of conveying means such as conveyor belts or chains increases, maintenance is difficult unless the entire unit is dismantled due to the nature of being installed inside a truck. Furthermore, even if the tension is adjusted, the installation work required to reinstall it is practically difficult for personnel without specialized technical skills.

[0041] In addition, most of these cargo loading and unloading devices make it difficult to carry out a series of processes to maintain hygiene or cleanliness, such as cleaning. Only the exposed conveyor belts can be cleaned, but in reality, due to the characteristics of various cargoes, large amounts of dirt, food scraps, dust attached during the delivery process, foreign substances, and grime penetrate between the conveyor belts. This leads to odor generation and hygiene problems, as well as contamination of the conveyor belts themselves, malfunctions, and breakdowns. Prior art literature

[0043] 1. Republic of Korea Registered Patent No. 10-2435564, Registration Date August 18, 2022. 2. Republic of Korea Registered Patent No. 10-1166206, Registration Date July 10, 2012. The problem to be solved

[0044] Accordingly, the present invention was created to solve the problems described above, and aims to provide a belt tension adjustment unit for a cargo loading and unloading device that enables convenient loading and unloading of goods loaded on a truck without a worker having to get on or off the vehicle, and enables cost reduction of the expensive conveyor belt used for loading and unloading by cutting the conveyor belt to a length corresponding to half or 60% of the length used for loading and unloading goods on an infinitely rotating, expensive conveyor belt that is loaded and horizontally transported, and allows for smooth operation of cargo loading and unloading by adjusting the tension of the conveyor belt cut to the length used for loading and unloading goods, while also preventing malfunction of the cargo loading and unloading device or damage or breakage of goods loaded on the conveyor belt due to tension reduction.

[0046] In addition, the present invention has another objective of providing a belt tension adjustment unit for a cargo loading and unloading device, which uses a conveyor belt cut to the length used for cargo loading and unloading, thereby allowing parts such as the conveyor roller and the drive roller of the loading and unloading conveying means to be exposed to the outside through the forward and backward movement of the conveyor belt, making it easy to find damage, breakage, or defects in the parts, thus facilitating easy replacement and repair, and facilitating easy maintenance, and also facilitating easy removal of contaminants such as dust, foreign matter, and dirt, thereby solving problems related to odor generation or hygiene. means of solving the problem

[0048] To achieve the above purpose, the belt tension adjustment unit of the cargo loading and unloading device installed in a box truck according to the present invention comprises: a base frame (100) formed in a rectangular shape inside the closed cargo compartment of the box truck by combining a plurality of frames so as to correspond to the front, rear, left, and right inner floors in the longitudinal direction of the rear side where the rear door is provided from the front of the driver's seat side of the closed cargo compartment of the box truck; a roller frame (110) installed on the upper surface of the frame in the longitudinal direction of the left and right sides of the base frame, having a plurality of "U" shaped roller fitting grooves (112) formed open upwards on the same line facing each other on the left and right sides; and a plurality of transfer rollers (200) that rotate freely while rolling motion, with both ends of the roller shafts bearing-coupled to the roller fitting grooves (112) formed as a pair facing each other on the same line being detachably attached and detachable, and coupled perpendicularly to the longitudinal direction of the roller frame (110). A drive roller (210) having bearings attached to both ends of a roller shaft that is detachably connected between mutually facing roller fitting grooves (112) for connecting the next transfer roller of the transfer roller closest to the front inner side of the driver's seat of the closed cargo compartment among the plurality of transfer rollers (200) to prevent interference with the driver's seat side of the closed cargo compartment, and a drive sprocket (212) perpendicular to the axis line fixedly connected to one side of the outer circumference of the roller shaft; and a disc-shaped guide rotating plate (220) fixedly connected to the roller shaft so as to rotate together when the transfer roller and the drive roller rotate, between the respective ends of the transfer roller (200) and the drive roller (210) and the roller frame (110) to prevent interference by contacting the roller frame (110) at each end of the transfer roller (200) and the drive roller (210); A drive transmission member (300) having a rear side transfer roller formed with a door for loading and unloading cargo in a closed cargo compartment of a truck, a drive roller and a drive roller, and a drive chain (320) formed to transmit power of the drive roller according to the rotation of the drive sprocket (212), wherein a drive sprocket (310) is axially coupled between the guide rotating plate (220) and each roller at both left and right ends of the drive roller between the rear side transfer roller and the drive roller;A main sprocket (410) that is chain-coupled to the drive sprocket (212) of the drive roller (210) and generates power to rotate the drive sprocket in forward and reverse directions is coupled to the motor shaft, and a drive motor (400) coupled to one side of the outer lower surface of the box truck; a conveyor belt (500) formed by wrapping the entire front and rear of the transfer roller coupled to the roller frame (110) and rotating infinitely, extending the continuous circumference length into a straight length and cutting it to a length corresponding to half to 60% of the total length, and covering only the upper portions of each transfer roller and drive roller arranged to the rear side while wrapping the transfer roller coupled to the front end; and a belt tension adjustment unit (600) coupled to the front end of the conveyor belt (500) wrapping the transfer roller on the rear door side of the box truck and provided to adjust the tension of the conveyor belt; A drag panel (700) is provided to move horizontally together with the conveyor belt to support and brace the load of the cargo and to adjust the space according to the amount of cargo loaded, and is formed with a horizontal piece (710) having one end connected to the leading end of the conveyor belt formed above the driver's side transfer roller of the truck, and a vertical piece (720) formed by bending the horizontal piece at a right angle toward the driver's side to stand upright; A tension member (800) is formed on one side of the conveyor belt from the belt tension adjustment unit to the left and right of the conveyor belt, extending from the conveyor roller where the rear door of the truck covered by the conveyor belt is located to the drive roller side, so that the conveyor belt (500) can rotate smoothly on the conveyor roller and the drive roller, and the other side is formed symmetrically from the belt tension adjustment unit to the left and right of the conveyor belt and the lower side of the conveyor roller and the drive roller not covered by the conveyor belt, so that the conveyor belt (500) can rotate smoothly on the conveyor roller and the drive roller, and the conveyor belt tension adjustment unit performs the role of a conveyor belt and the conveyor belt tension adjustment by the belt tension adjustment unit; and a control controller (900) is wired or wirelessly connected to the drive motor (400) on one side of the rear door of the closed cargo compartment of the truck to control the ON / OFF and forward / reverse rotation of the drive motor (400).It is characterized by being formed as.;

[0050] Here, the "U" shaped roller fitting groove (112) of the roller frame (110) is characterized by being formed with a "U" shaped bearing seating portion (114) in which a bearing coupled to both ends of the roller shaft of the transfer roller (200) or the drive roller (210) is seated, and a "U" shaped stopper (116) smaller than the diameter of the bearing seating portion to prevent the bearing from being dislodged outward from the bearing seating portion.

[0052] Meanwhile, the belt tension adjustment unit (600) is formed with a width corresponding to the width of the conveyor belt (500) and has a fixed horizontal piece (612) formed to be fixedly coupled to the leading end of the conveyor belt that surrounds the transfer roller on the rear door side of the truck, and a fixed vertical piece (614) formed vertically on one side of the fixed horizontal piece (612) at a height that moves back and forth without interference with the transfer roller, and a fixing bar (610) having a fixing hole (616) symmetrically provided on the left and right of the fixed vertical piece (614) and a plurality of hanging holes (618) formed between the fixing holes (616); A tension-adjusting movable bar (620) is formed as a rectangular housing with open top and bottom, having a length corresponding to the width of a conveyor belt (500) and facing the fixing bar (610), with front-to-back symmetrical tension member coupling holes (622) formed so that tension members (800) are coupled to the left and right sides, and adjustment fixing holes (626) aligned with the fixing holes (616) are formed on the left and right sides of one side facing the fixing bar (610), and left and right tension adjustment parts (624) are symmetrically formed to protrude, having a tension adjustment space part (627) having a tension adjustment distance from the center of the adjustment fixing holes (626) to the side touching the fixing bar (610), and a fastening hole (628) is formed on one side facing the fixing bar (610) of the rectangular housing between the left and right tension adjustment parts (624); A left-right adjustment bolt (630) that is connected through the fixing hole (616) of the above-mentioned fixing bar (610) and is nut-fastened within the tension adjustment space (627) by passing through the adjustment connection hole (626) of the tension adjustment movable bar (620); a tension adjustment bar (640) that is formed long with a width corresponding to the distance between the left-right symmetrical left-right tension adjustment parts (624), is positioned between the tension adjustment movable bar (620) and the fixing bar (610), has an adjustment connection hole (642) formed in line with the connection hole (628), and a hanging connection hole (644) formed in line with the hanging hole (618); and a central adjustment bolt (650) that is connected through the connection hole (628) of the above-mentioned tension adjustment movable bar (620) and is nut-fastened by passing through the adjustment connection hole (644) of the above-mentioned tension adjustment bar (640).It is characterized by being formed by a plurality of tension coil springs (660) arranged such that both ends are hooked and connected to the hook hole (618) of the fixing bar (610) and the hook connection hole (644) of the tension adjustment bar (640) to pull the fixing bar (610) and the tension adjustment movable bar (620).

[0054] Here, the tension member (800) is formed such that the front left and right tension member coupling holes (622) among the tension member coupling holes (622) formed symmetrically on the left and right sides of the tension adjustment movable bar (620) are connected through the front left and right tension member coupling holes, so that the front ends of the tension member coupling holes (622) are connected through the guide rotating plate (220) formed on the left and right sides of the transfer roller (200) where the rear door of the truck covered by the conveyor belt is located and the upper side of the transfer roller, and the left and right ends of the guide rotating plate (220) formed on the left and right sides of the drive roller (210) and the upper side of the drive roller, and is connected to the drag panel; It is characterized by being formed with a second tension member (820) that is connected to a drag panel located above the driving roller and the transfer roller, with the left and right ends passing through the rear side left and right tension member connecting holes (622) of the tension member connecting holes (622) so that the ends of both ends are divided left and right with a width corresponding to the width of the conveyor belt (500). The second tension member (820) is connected to the drag panel located above the driving roller and the transfer roller, with the left and right ends passing through the guide rotating plate (220) formed on the left and right sides of the transfer roller (220) formed on the front side driver's seat side of the truck and the lower side of the transfer roller, from between the guide rotating plate (220) formed on the left and right sides of the transfer roller (220) formed on the front side driver's seat side of the truck.

[0056] Meanwhile, a pulley (360) is further formed between the guide rotating plate (220) coupled to both left and right ends of the transfer roller (200) and the drive roller (210) and between each roller, or between the guide rotating plate (220) and the driven sprocket (310), or a dirt catcher (102) in the shape of a "┗┛" is formed so that dust or foreign matter generated from cargo loaded on the bottom side of the base frame (100) falls to the bottom of the transfer roller and is received, and the rear door is opened to allow the dust or foreign matter received to be removed by being pulled out and pulled in like a drawer to the outside of the rear door.

[0058] Meanwhile, a roller frame (110) is coupled to the base frame (100), a plurality of transfer rollers (200) are coupled to the roller frame, guide rotating plates (220) are coupled to both ends of each transfer roller, and two or more conveyor belts (500) with a length of half to 60% between the transfer rollers are coupled by a belt tension adjustment unit (600) and a tension member (800) to correspond to the width of the space where the loading / unloading transfer means configuration of the truck is installed, wherein the transfer rollers (200) of the loading / unloading transfer means adjacent to the transfer rollers of the loading / unloading transfer means are axially connected so as to be driven as one, and the drag panel (700) is formed as a single unit with a width corresponding to the total width of two or more loading / unloading transfer means, and the tension member (800) of each loading / unloading transfer means is a single unit connected to the belt tension adjustment unit (600) coupled to each conveyor belt (500). It is preferable that a conveyor roller (200) installed in a position that does not interfere with installation inside the closed cargo compartment on the driver's side of the truck is connected to a drag panel (700) and, in one of the loading and unloading conveyor means connected to a plurality of continuously connected conveyor means, be replaced with a drive roller (210) and connected to a drive motor (400) and a drive transmission member (300) is connected to both ends of the conveyor roller and the drive roller so that the drive force of the drive motor (400) is transmitted from the drive roller (210) to the drive transmission member (300), and the conveyor belt (500) and the drag panel (700) connected by a tension member (800) are configured to operate forward and backward during loading and unloading of cargo while maintaining tension through tension adjustment of the belt tension adjustment unit (600). Effects of the invention

[0060] The present invention enables convenient loading and unloading of goods loaded on a truck without a worker having to get on or off the vehicle, and allows for cost reduction of the expensive conveyor belt used for loading and unloading by cutting the conveyor belt to a length corresponding to half to 60% of the length used for loading and unloading goods on an infinitely rotating, expensive conveyor belt that is loaded and horizontally transported. Additionally, by adjusting the tension of the conveyor belt cut to the length used for loading and unloading goods through a belt tension adjustment unit and a tension member, it is possible to ensure smooth operation of loading and unloading goods and prevent malfunction of the loading and unloading device or damage or breakage of goods loaded on the conveyor belt caused by tension reduction.

[0062] In addition, the present invention has the advantage of being able to easily maintain and easily remove contaminants such as dust, foreign matter, and dirt through a roller frame in which parts such as the conveyor roller and the drive roller of the loading / unloading means are exposed to the outside through the forward and backward movement of the conveyor belt, making it easy to find damage, defects, or breakage of the parts and easy to replace them, thereby solving problems of odor generation or hygiene. Brief explanation of the drawing

[0064] FIG. 1 is a perspective view of a belt tension adjustment unit of a cargo loading and unloading device installed in a truck according to the present invention. FIG. 2 is an overall exploded perspective view of a belt tension adjustment unit of a cargo loading and unloading device installed in a truck according to the present invention. FIG. 3 is an enlarged perspective view of the roller frame and drive roller of the belt tension adjustment unit of the cargo loading / unloading device installed in a truck according to the present invention. FIG. 4 is a perspective view of the roller frame of the belt tension adjustment unit of the cargo loading and unloading device installed in a truck according to the present invention and the main part of the belt tension adjustment unit. FIG. 5 is a perspective view of a key part of a conveyor belt of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention. FIG. 6 is a side view illustrating the usage form of a conveyor belt of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention. FIG. 7 is a perspective view of a key part of a belt tension adjustment unit of a cargo loading and unloading device installed in a truck according to the present invention. FIG. 8 is an exploded perspective view of the main part of the belt tension adjustment unit of a cargo loading and unloading device installed in a truck according to the present invention. FIG. 9 is a perspective view of a key part of a tension member of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention. FIGS. 10 to 12 are plan views of the conveyor belt tension adjustment operation state of the belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention. FIG. 13 is a perspective view illustrating another embodiment of a belt tension adjustment unit of a cargo loading and unloading device installed in a truck according to the present invention. FIG. 14 is a side view illustrating an embodiment in which a waste catcher of a cargo loading and unloading device installed on a truck according to the present invention is applied. Specific details for implementing the invention

[0065] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in a number of different forms.

[0066] In this specification, the embodiments are provided to ensure that the disclosure of the invention is complete and to fully inform those skilled in the art of the scope of the invention. The invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques are not specifically described to avoid the invention being interpreted ambiguously.

[0067] Throughout the specification, the same reference numerals refer to the same components. Furthermore, the terms used (mentioned) in this specification are for describing the embodiments and are by no means intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. Additionally, components and operations referred to as "comprising (or comprising)" do not exclude the presence or addition of one or more other components and operations.

[0068] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless otherwise defined.

[0070] Hereinafter, technical features according to an embodiment of a belt tension adjustment unit of a cargo loading and unloading device installed in a truck according to the present invention will be specifically described with reference to the attached drawings.

[0072] FIG. 1 is a perspective view of a belt tension adjustment unit of a cargo loading / unloading device installed on a truck according to the present invention, FIG. 2 is an overall exploded perspective view of a belt tension adjustment unit of a cargo loading / unloading device installed on a truck according to the present invention, FIG. 3 is an enlarged perspective view of a key part of a roller frame and a drive roller of a belt tension adjustment unit of a cargo loading / unloading device installed on a truck according to the present invention, FIG. 4 is a perspective view of a key part of a roller frame and a belt tension adjustment unit of a cargo loading / unloading device installed on a truck according to the present invention, FIG. 5 is a perspective view of a key part of a conveyor belt of a belt tension adjustment unit of a cargo loading / unloading device installed on a truck according to the present invention, FIG. 6 is a side view illustrating the usage form of a conveyor belt of a belt tension adjustment unit of a cargo loading / unloading device installed on a truck according to the present invention, FIG. 7 is a cargo loading / unloading device installed on a truck according to the present invention FIG. 8 is an exploded perspective view of a key part of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention, FIG. 9 is a perspective view of a key part of a tension member of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention, FIG. 10 to FIG. 12 are plan views of the conveyor belt tension adjustment operation state of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention, FIG. 13 is a perspective view illustrating another embodiment of a belt tension adjustment unit of a cargo loading / unloading device installed in a truck according to the present invention, and FIG. 14 is a side view illustrating an embodiment in which a waste catcher of a cargo loading / unloading device installed in a truck according to the present invention is applied.

[0074] The belt tension adjustment unit of the cargo loading and unloading device installed in a box truck according to the present invention does not use a conventional, expensive, infinitely rotating conveyor belt that is horizontally transported within the cargo compartment for loading and unloading cargo. Instead, it allows the entire infinitely rotating conveyor belt to be cut to a length corresponding to half to 60% of the length used for cargo loading and unloading, and adjusts the tension of the cut conveyor belt through the belt tension adjustment unit and a wire member. This ensures smooth operation of cargo loading and unloading while preventing malfunction of the cargo loading and unloading device or damage to cargo loaded on the conveyor belt caused by tension reduction, while also being economical in installation costs. Furthermore, since the conveyor belt operates by covering only a portion of components such as transfer rollers or drive rollers rather than covering the entire assembly, the components are exposed to the outside, allowing for easy detection of defects or damage. Consequently, replacement or repair is easy, making maintenance simple. Additionally, the device is configured to facilitate the easy replacement of components directly involved in the movement of cargo, such as transfer rollers or drive rollers, thereby simplifying overall maintenance. It is formed to be convenient and to facilitate the removal of foreign substances accumulated on the floor of the cargo compartment, and as shown in FIGS. 1 and 2, it is composed of a base frame (100), a roller frame (110), a transfer roller (200), a driving roller (210), a guide rotating plate (220), a driving transmission member (300), a driving motor (400), a conveyor belt (500), a belt tension adjustment unit (600), a drag panel (700), a tension member (800), and a control controller (900).

[0076] The base frame (100) is formed in a rectangular shape inside the closed cargo compartment of a truck by combining a plurality of frames so as to correspond to the front, rear, left, and right inner floors along the longitudinal direction from the front of the driver's seat side of the closed cargo compartment of the truck to the rear door. Here, the base frame (100) may be formed as a single rectangular frame, but it is also preferable to form it so as to divide the internal space of the base frame by combining frames corresponding to the length from the front of the driver's seat side of the truck to the rear door within the rectangular frame, or it is also preferable to form it by arranging a plurality of rectangular base frames.

[0078] That is, the spatial arrangement of the base frame is intended to prevent the central part from being eccentric from the rotation axis by increasing the overall length of the transfer roller or drive roller coupled to the roller frame (110) described later, and also to ensure strength against the weight of the loaded cargo.

[0080] As shown in FIGS. 3 and 4, the roller frame (110) is configured to allow rolling motion by combining both ends of the transfer roller and the drive roller described later. It is installed on the upper surface of the frame along the left and right longitudinal direction of the base frame, and is configured to easily attach and detach the transfer roller and the drive roller by forming a plurality of "U" shaped roller fitting grooves (112) that are open upward on the same line facing each other on the left and right.

[0082] Here, the roller fitting groove (112) of the roller frame (110) is formed in a "U" shape, making it easy to insert the roller shaft of a roller, such as a transfer roller and a driving roller, from the upper side. When replacing a roller due to breakage or damage, the roller can be easily lifted upward, and the roller shaft or the roller shaft with a bearing attached can be easily removed from the roller fitting groove (112) to facilitate replacement.

[0084] The roller fitting groove (112) described above is formed with a "U"-shaped bearing seating portion (114) in which a bearing coupled to both ends of the roller shaft of the transfer roller (200) or drive roller (210), which will be described later, is seated, and a "U"-shaped stopper (116) smaller than the diameter of the bearing seating portion to prevent the bearing from coming out of the bearing seating portion. That is, the bearing seating portion (114) is formed with a diameter corresponding to the bearing diameter so that the bearing is seated and the rolling motion of the roller can be performed smoothly, and the stopper (116) is intended to prevent the bearing from coming out due to vibrations generated during the rolling motion of the roller or impacts caused by loads applied to the upper part of the roller.

[0086] The above transfer roller (200) is configured such that, when a cargo is placed on the conveyor belt while the conveyor belt described later covers the upper part of the transfer roller (200), the transfer roller receives rotational force as the drive roller described later rotates by the driving force of the drive motor, and at this time, the conveyor belt is also formed to move forward and backward along with the rotation of the transfer roller due to the frictional force in contact with the transfer roller. In addition, by configuring a plurality of transfer rollers (200), the cargo moves forward and backward stably on the conveyor belt without vertical oscillation. Furthermore, the plurality of transfer rollers (200) serve to support the conveyor belt while maintaining its flatness.

[0088] Accordingly, the above-mentioned transfer rollers (200) are formed in a number and arranged according to the distance of the space where cargo can be moved back and forth and loaded, and are provided in correspondence with the number of the aforementioned roller fitting grooves (112). The above-mentioned transfer rollers (200) are provided to rotate freely while rolling, with the ends of the roller shafts bearing-coupled to the roller fitting grooves (112) formed as a pair facing each other on the same line being detachably coupled perpendicular to the longitudinal direction of the roller frame (110).

[0090] The above-mentioned drive roller (210) receives power from the drive motor described later and drives the transfer roller, conveyor belt, and drag panel unit to move back and forth. In order to prevent interference with the front inner side of the driver's seat of the enclosed cargo compartment of the truck, the ends of the roller shaft, each having a bearing, are detachably connected between mutually facing roller fitting grooves (112) for connecting the next transfer roller of the transfer roller closest to the front inner side of the driver's seat of the enclosed cargo compartment among the plurality of transfer rollers (200), and a drive sprocket (212) perpendicular to the axis is fixedly connected to one side of the outer circumference of the roller shaft.

[0092] That is, regarding the drive roller (210) above, since the truck has a closed cargo compartment due to its characteristics, and the closed cargo compartment is closest to the front inner side of the driver's seat side of the truck, if the drive roller is coupled instead of the transfer roller, the drive transmission configuration by chain must first prevent interference with the cargo compartment wall, so a certain distance must be maintained from the inner wall of the cargo compartment, thereby imposing restrictions on the utilization of the cargo compartment space. In addition, in the case of the drive motor described later, in order to be coupled to the outside of the truck, it must be installed in a space that does not interfere with the vehicle beam or vehicle power transmission part on the lower side of the truck, so it is usually installed on the left and right sides where the cargo compartment and the driver's seat side meet. The reason the drive motor cannot be installed in the center of the lower part of the vehicle is that the vehicle beam is formed, making it impossible to install the drive motor.

[0094] Therefore, as mentioned above, by configuring the drive roller to be coupled to the position where the transfer roller following the transfer roller closest to the front inner surface of the driver's seat side of the enclosed cargo compartment of the box truck is coupled among the transfer rollers coupled to the roller fitting groove of the roller frame, it is possible to prevent interference between the operation of the chain transmitting the driving force of the drive motor and the cargo compartment wall, and to optimize the use of the cargo compartment space.

[0096] Furthermore, the drive sprocket (212) of the drive roller is fixedly coupled to one side of the outer circumference of the drive roller at a position perpendicular to the axis so as to be positioned on the same vertical line as the main sprocket coupled to the drive shaft of the drive motor described later, thereby configuring the drive roller to rotate according to power transmission.

[0098] The guide rotating plate (220) is formed on a roller shaft that is connected to a roller frame and is bearing-coupled for the rolling motion of the transfer roller or drive roller to prevent friction, noise, and interference caused by contact with the roller frame when one side is tilted to one side due to external forces such as rotational vibration while the transfer roller and drive roller are rolling and rotating. It is formed at both ends of the roller to prevent tilting to one side itself. It is formed in the shape of a disc that is fixedly coupled to the roller shaft so that it rotates together with the transfer roller and drive roller when they rotate, between the ends of the transfer roller (200) and the drive roller (210) and the roller frame, so that interference is prevented when the transfer roller and drive roller come into contact with the roller frame (110).

[0100] Here, it is preferable that the guide rotating plate (220) has a diameter equal to or smaller than the diameter of the conveyor roller or the drive roller. This is because, in order to transmit power and cause the conveyor belt described later to move back and forth, the conveyor roller and the drive roller that come into contact with the conveyor belt must have the same diameter to ensure smooth contact with the conveyor belt. However, if the diameter is larger than that of the conveyor roller or the drive roller, the surface area of ​​the conveyor belt in contact with the conveyor roller and the drive roller is reduced, which hinders the smooth back-and-forth operation of the conveyor belt.

[0102] The above-described drive transmission member (300) is configured to transmit the driving force of a drive roller, which receives power from the drive motor, to a plurality of transfer rollers. A driven sprocket (310) is axially coupled between a guide rotating plate (220) and each roller at the left and right ends of the rear transfer roller, which has a door formed for loading and unloading cargo in the closed cargo compartment of a box truck, and the drive roller and the transfer roller between the rear transfer roller and the drive roller. A driven chain (320) is formed to transmit the power of the drive roller according to the rotation of the drive sprocket (212). That is, the driving force is transmitted through chain coupling to rotate a plurality of transfer rollers simultaneously while minimizing the loss of the driving force of the drive roller.

[0104] Here, the driven sprocket (310) and the driven chain (320) of the drive transmission member (300) are formed to be smaller than the diameter of the transfer roller and the drive roller so that the drive force can be transmitted without interference to the forward and backward movement between the transfer roller, which receives the drive force, and the conveyor belt described later, by being coupled between the guide rotating plate and each end of the respective roller. In addition, since high-speed rotation is not required, the drive sprocket (212) described above is not positioned in the center, so it does not become eccentric when the transfer roller or the drive roller rotates; and even if it does become eccentric, the center is automatically positioned by the guide rotating plate, so there is no interference with the drive force transmission.

[0106] The above-described drive motor (400) is connected to the drive sprocket (212) of the drive roller (210) described above, and a main sprocket (410) that generates power to rotate the drive sprocket in forward and reverse directions is connected to the motor shaft and connected to one side of the outer lower surface of the box truck. That is, as described above, due to the characteristics of the box truck, the vehicle's beam or a configuration for vehicle power transmission is provided on the outer floor side of the cargo compartment, so it is virtually impossible to install the drive motor; therefore, the drive motor is installed biased to one side of the left or right side of the cargo compartment. Accordingly, the drive roller, which receives the rotational force of the biased drive motor, may become eccentric while rotating and may interfere with the roller frame, but primary eccentricity can be prevented by the guide rotating plate, and since high-speed rotation is not required due to the characteristics of loading and unloading cargo, and high-speed movement is not required, eccentricity can be prevented during the rotation of the drive roller.

[0108] The above conveyor belt (500) is generally configured to rotate infinitely by wrapping around the entire circumference of the transfer roller and the drive roller, but in reality, such a conveyor belt is made of a material with high wear resistance and durability, so it is quite expensive. Therefore, considering the loading and unloading characteristics of the cargo, the conveyor belt in the present invention is configured to make the conveyor belt only on the upper side of the transfer roller and the drive roller where the cargo is loaded, as shown in FIGS. 5 and 6, thereby enabling more economical production. However, since there is a problem with operating the infinite rotation of the conveyor belt, it is configured as a conveyor belt combined with a tension member described later.

[0110] The conveyor belt (500) according to the present invention is formed by extending a continuous circumference length that wraps around the entire front and rear of the conveyor roller coupled to the roller frame (110) and rotates infinitely, and then cutting it into a length corresponding to half to 60% of the total length, and is formed to wrap around the conveyor roller coupled to the front end and cover only the upper portions of each conveyor roller and drive roller arranged to the rear side. The operation of the conveyor belt (500) formed in this way is configured to move back and forth during loading and unloading at the upper side of the conveyor roller and drive roller where cargo is substantially loaded through the combination of a tension member and a belt tension adjustment unit described later, thereby reducing the cost of the expensive conveyor belt.

[0112] The belt tension adjustment unit (600) described above is intended to adjust the tension of the conveyor belt. As previously mentioned, in the case of a conventional infinitely rotating conveyor belt, the tension is adjusted by adjusting the spacing of a separate roller to compensate for the loss of tension caused by the length increase during use of the conveyor belt. However, in the present invention, since the conveyor belt (500) itself is used only half to 60%, a tension adjustment roller cannot be separately configured when the conveyor belt (500) increases. This is because the space of the truck is limited, and if a tension adjustment roller is to be configured within the limited space, the internal space of the truck must be allocated. In this case, there is a problem in that the cargo loading capacity is reduced due to the loss in space utilization of the truck.

[0114] Accordingly, the belt tension adjustment unit (600) is configured to adjust the tension of the belt by adjusting the tension member described later, and is configured to adjust the tension of the conveyor belt (500) which surrounds the conveyor roller on the rear door side of the truck, as shown in FIGS. 7 and 8, and is composed of a fixing bar (610), a tension adjustment movable bar (620), a left / right adjustment bolt (630), a tension adjustment bar (640), a center adjustment bolt (650), and a tension coil spring (660).

[0116] As illustrated, the fixing bar (610) is coupled to the leading edge of the conveyor belt (500) that surrounds the conveyor roller on the rear door side of the truck, and a fixed horizontal piece (612) is formed with a width corresponding to the width of the conveyor belt (500) and fixedly coupled to the leading edge of the conveyor belt that surrounds the conveyor roller on the rear door side of the truck. Then, a fixed vertical piece (614) is formed on one side of the fixed horizontal piece (612) (inward direction of the driver's seat side of the closed cargo compartment of the truck) to a height that moves back and forth without interfering with the conveyor roller.

[0118] Here, the fixed vertical piece (614) is provided with a fixing hole (616) symmetrically on the left and right sides, into which a left-right adjustment bolt (630), described later, is fitted and fixed, and a plurality of hanging holes (618) are formed between the fixing holes (616) so that one end of a tension coil spring (660), described later, is hung and connected.

[0120] The above tension adjustment movable bar (620) is provided to be coupled with a tension member to be described later, and the tension member is formed to be symmetrically branched toward both ends of the transfer roller and the drive roller so as to balance the left and right sides of the conveyor belt. It is formed as a rectangular housing with open top and bottom, with a length corresponding to the width of the conveyor belt (500), and faces the fixing bar (610) in the inner direction of the driver's seat of the closed cargo compartment of the truck, and has symmetrical tension member coupling holes (622) formed on the left and right sides so that the tension member (800) can be coupled.

[0122] Here, in a rectangular enclosure that is open at the top and bottom, an adjustment fixing hole (626) is formed in alignment with the fixing hole (616), through which the head portion of the left and right adjustment bolt is caught and connected on the left and right sides facing the fixing bar (610). The adjustment fixing hole is configured so that the tip of the left and right adjustment bolt connected through the fixing hole is connected through it. Accordingly, a left and right tension adjustment section (624) is symmetrically formed to protrude to the left and right sides facing the fixing bar of the rectangular enclosure that is open at the top and bottom, each having a tension adjustment space section (627) having a tension adjustment distance from the center of the adjustment fixing hole (626) to the side touching the fixing bar (610).

[0124] In addition, a fastening hole (628) is formed on one side facing the fixing bar (610) of the rectangular housing between the left and right tension adjustment parts (624), to which the head side is caught by fastening the central adjustment bolt described later.

[0126] A tension member formed in an elongated longitudinal direction through the tension member coupling hole (622) described above of the tension control movable bar (620) is coupled to either the left or right side of the tension member coupling hole, with the tip passing through to the right or left side, and the left and right tips are divided into equal lengths outside the tension member coupling hole, and the center of the tension member is coupled to the left and right sides of the tension member coupling hole and is coupled to the tension control movable bar. As shown in FIGS. 7 and 9, the left and right tips of the tension member are each branched to the left and right of the tension control movable bar and fixed while maintaining left-right balance with a width corresponding to the left and right width of the conveyor belt.

[0128] At this time, when the configuration is not combined with the drag panel described later, it is combined to the left and right sides of the conveyor belt, and when the drag panel is configured, as shown in FIGS. 6 and 9, the leading edge of the tension member branched to the left and right is combined with the drag panel. Here, the drag panel is a configuration installed to support the weight of the cargo during loading and unloading, to prevent the transfer roller or drive roller from moving into an exposed space without being covered by the conveyor belt formed inside the cargo compartment during the forward and backward movement of the conveyor belt configured to half to 60% of its length, and to efficiently utilize the space according to the amount of loaded cargo.

[0130] The above left and right adjustment bolt (630) serves to adjust the tension to balance the left and right sides of the conveyor belt. It is connected through the fixing hole (616) of the fixing bar (610) and passes through the adjustment coupling hole (626) of the tension adjustment movable bar (620) to be fastened with a nut within the tension adjustment space (627). That is, by adjusting the nut within the tension adjustment space (627), the fixing bar (610) and the tension adjustment movable bar (620) are pulled when they are close to each other, and the tension is loosened when they are far apart. By adjusting the left and right sides respectively, it is provided to balance the left and right sides of the conveyor belt (500) with the tension member described later.

[0132] The tension adjustment bar (640) is configured to adjust the tension in the central part of the width of the conveyor belt, while ensuring the fluidity of the tension through a tension coil spring described later. The problem of restricting forward and backward movement is that if the conveyor belt is pulled too tightly, it may become lifted from the outer periphery of the transfer roller and the drive roller, and if it is too loose, there may be a problem of damage or breakage of the cargo due to impact caused by bending between the rollers of the cargo due to the weight of the loaded cargo. Therefore, the fluidity of the tension can be ensured by the elastic force of the tension coil spring to provide an appropriate tension (a tension that facilitates the transmission of driving force to the transfer roller and the drive roller while minimizing impact on the loaded cargo).

[0134] Accordingly, the tension adjustment bar (640) is formed with a left-right length corresponding to the distance between the left-right symmetrical tension adjustment parts (624), and is positioned between the tension adjustment movable bar (620) and the fixing bar (610). An adjustment fastening hole (642) is formed in the same line as the fastening hole (628), through which the head side of the central adjustment bolt is caught and the tip side passes, so that the tip of the central adjustment bolt passes through. Additionally, a hook fastening hole (644) is formed in the same line as the hook hole (618), through which one end of the tension coil spring is hook-coupled, so that the other end of the tension coil spring is hook-coupled.

[0136] As previously described, the central adjustment bolt (650) is provided to adjust the tension on the central side of the width of the conveyor belt, and is configured to ensure fluidity of tension by interacting with the elastic force of the tension coil spring described later.

[0138] Accordingly, the central adjustment bolt (650) is connected through the fastening hole (628) of the tension adjustment movable bar (620) and is fastened with a nut by passing through the adjustment fastening hole (644) of the tension adjustment bar (640). Here, as shown in FIGS. 10 and 11, when the nut is tightened and the tension adjustment bar (640) and the tension adjustment movable bar (620) are brought close together, the tension is greatly increased, and when they are moved apart, the tension decreases.

[0140] As previously described, the above tension coil spring (660) is intended to ensure fluidity of the central tension of the conveyor belt, and both ends are hooked and connected to the hook hole (618) of the fixing bar (610) and the hook connection hole (644) of the tension adjustment bar (640), and are arranged to pull the fixing bar (610) and the tension adjustment fluid bar (620) as shown in FIG. 12.

[0142] Here, regarding the width of the conveyor belt, the central tension is adjusted by tightening the nut coupled to the central adjustment bolt as previously mentioned, but it is preferable to adjust the tension by taking into account the elastic force of the tension coil spring (660). This is because, even if the nut of the central adjustment bolt is tightened small, assuming the ideal tension is 100, if the tension range due to the elastic force of the tension coil spring is 30 to 60, tension compensation due to the elastic force of the tension coil spring is achieved without raising the central tension of the conveyor belt by the central adjustment bolt to 100, thereby allowing the tension to be continuously maintained, and in particular, there is an advantage of maintaining tension between the upper and lower parts of the cargo. That is, even if the tension of the central adjustment bolt is not adjusted to a total of 100 but is adjusted only to 40 to 70, the ideal tension due to the tension coil spring can be maintained, thus ensuring flexibility in tension adjustment.

[0144] As briefly mentioned earlier, the above drag panel (700) is configured to support and brace the cargo load during loading and unloading, prevent the cargo from deviating toward the exposed conveyor roller and drive roller side not covered by the conveyor belt, and enable efficient use of the cargo compartment space according to the amount of cargo loaded. As shown in FIGS. 1 and 2, a horizontal piece (710) is formed with one end connected to the leading edge of the conveyor belt formed above the conveyor roller on the driver's side of the truck, and a vertical piece (720) is formed by being bent at a right angle toward the driver's side of the horizontal piece and standing upright, so as to be arranged to move horizontally together with the conveyor belt to support and brace the cargo load and to adjust the space according to the amount of cargo loaded.

[0146] As shown in FIG. 9, the above tension member (800) is configured to perform the role of the remaining part of the conveyor belt used for half to 60% of the conveyor belt and to perform the role of adjusting the tension of the conveyor belt. In order for the conveyor belt (500) to rotate smoothly on the conveyor roller and the drive roller, one tension member is formed from the belt tension adjustment unit to the left and right sides of the conveyor belt from the conveyor roller where the rear door of the truck covered by the conveyor belt is located to the drive roller side and is coupled to the drag panel. The other tension member is formed symmetrically from the belt tension adjustment unit to the left and right sides of the lower side of the conveyor roller and drive roller not covered by the conveyor belt and is coupled to the drag panel (700).

[0148] Here, the tension member (800) is preferably formed of a wire, and if a drag panel is not formed, it is coupled to a conveyor belt, and the tension member (800) is configured as a first tension member (810) and a second tension member (820) as shown in FIG. 9.

[0150] The first tension member (810) is formed symmetrically on the left and right sides of the tension member coupling hole (622) on the left and right sides of the tension control movable bar (620) so that the ends of both ends are divided into left and right sides with a width corresponding to the width of the conveyor belt (500), and is coupled to the drag panel by passing through the left and right ends of the guide rotating plate (220) formed on the left and right sides of the conveyor roller (200) where the rear door of the truck covered by the conveyor belt is located and the upper side of the conveyor roller, and then passing through the guide rotating plate (220) formed on the left and right sides of the drive roller (210) and the upper side of the drive roller.

[0152] The first tension member (810) described above receives some of the driving force as it passes between the guide rotating plate formed at both ends of the conveyor roller and the end of the conveyor roller for the forward and backward movement of the conveyor belt, and acts as a guide for horizontal formation to correspond to the driving and extended conveyor belt according to the forward and backward movement of the conveyor belt, as well as to perform the role of tension adjustment and maintenance with the second tension member by the belt tension adjustment unit.

[0154] The second tension member (820) is connected to the rear left and right tension member coupling holes (622) by passing through them so that the front ends of both ends are divided into left and right sides with a width corresponding to the width of the conveyor belt (500). The left and right ends pass between the guide rotating plate (220) formed on the left and right sides of the conveyor roller (200) that is not covered by the conveyor belt and the lower side of the conveyor roller, and the guide rotating plate (220) formed on the left and right sides of the conveyor roller (220) on the front side of the driver's seat of the truck and the lower side of the conveyor roller, and are connected to the drag panel located above the driving roller and the conveyor roller.

[0156] The above-mentioned second tension member (820) is configured to maintain the adjusted tension after tension adjustment by reconnecting the front end of the second tension member (820) to the drag panel or conveyor belt to which it is connected, through length adjustment according to the tension adjustment according to the tension adjustment, in accordance with the tension adjusted by the belt tension adjustment unit mentioned earlier.

[0158] Therefore, the first tension member and the second tension member effectively serve as the rim of the conveyor belt.

[0160] Meanwhile, for the smooth operation of the above-mentioned tension member, it is preferable that a pulley (360) be further formed between the guide rotating plate (220) coupled to both left and right ends of the transfer roller (200) and the driving roller (210) and between each roller, or between the guide rotating plate (220) and the driven sprocket (310), as shown in FIG. 4. Here, the pulley (360) guides the wire, which is composed of a wire as shown in FIG. 4 and FIG. 7, and facilitates the smooth performance of the role formed by the tension member, such as regulating the tension of the conveyor belt by the wire and cutting the remaining part of the conveyor belt, and facilitates the transmission of some driving force.

[0162] As shown in FIG. 1, the above control controller (900) is wired or wirelessly connected to the drive motor (400) on one side of the rear door of the closed cargo compartment of the truck to control the ON / OFF and forward / reverse rotation of the drive motor (400). When the driver loads the cargo, the control controller (900) rotates the drive motor in the forward direction so that the conveyor belt moves forward and the drag panel also moves forward. When the drag panel is positioned toward the rear door of the truck, the drive motor is rotated in the reverse direction after the cargo is loaded so that the conveyor belt and the drag panel move to the inside of the cargo compartment, and controls the operation to be reversed when unloading.

[0164] Meanwhile, as shown in FIG. 14, a "┗┛" shaped debris catcher (102) is formed so that dust or foreign matter generated from cargo loaded on the bottom side of the base frame (100) falls to the bottom of the conveyor roller and is received. It is formed to be pulled out and pulled in like a drawer to the outside of the rear door by opening the rear door, thereby removing the received dust or foreign matter. This is practically impossible when configured with a general conveyor belt unless the entire conveyor belt is lifted.

[0166] However, since the conveyor belt of the present invention uses only half or 60% of its capacity, it is possible to reduce costs and also easily clean foreign matter that has fallen on the inner floor. First, if the aforementioned dirt catcher is not installed, the rear end of the conveyor belt combined with the drag panel is moved toward the rear door, and the space between the exposed transfer roller and the drive roller can be easily cleaned with a cleaning tool such as a broom or a vacuum cleaner. If such cleaning is cumbersome, as described above, the dirt catcher (102) is configured to be pull out in a drawer-like manner on the bottom side of the frame, making cleaning easy and maintenance simple.

[0168] Furthermore, as shown in FIG. 13, two or more loading / unloading transport means configurations for a truck are installed such that they correspond to the width of the space in which a roller frame (110) is coupled to the base frame (100), a plurality of transport rollers (200) are coupled to the roller frame, guide rotating plates (220) are coupled to both ends of each transport roller, and a conveyor belt (500) with a length of half to 60% is coupled between the transport rollers by a belt tension adjustment unit (600) and a tension member (800). The rollers are connected in a continuous manner, and the transport rollers of the loading / unloading transport means adjacent to the transport rollers (200) of the loading / unloading transport means are axially connected so as to be driven as one. The drag panel (700) is formed as a single unit with a width corresponding to the total width of two or more loading / unloading transport means, and the tension member (800) of each loading / unloading transport means is coupled to each conveyor belt (500). A belt tension adjustment unit (600) and a single drag panel (700) are connected, and in one of the loading and unloading transfer means in which a plurality of are connected in succession, a transfer roller (200) installed in a position that does not interfere with the inner side of the closed cargo compartment on the driver's side of the truck is replaced by a drive roller (210) and is chain-coupled with a drive motor (400). A drive transmission member (300) is connected to both ends of the transfer roller and the drive roller, so that the drive force of the drive motor (400) is transmitted from the drive roller (210) to the drive transmission member (300), and the conveyor belt (500) and the drag panel (700) connected by the tension member (800) are configured to operate forward and backward during loading and unloading of cargo while maintaining tension through the tension adjustment of the belt tension adjustment unit (600).

[0170] Although the present invention has been described in detail above as one embodiment, the scope of the present invention is not limited thereto, and it is evident that numerous variations and modifications are possible within the scope of the technical concept by those skilled in the art, and shall be considered to include the scope of substantial equivalents to the embodiment of the present invention. The technical features will be described in detail. Explanation of the symbols

[0172] 100 : Base frame 102 : Waste collector 110 : Roller frame 112 : Roller insertion groove 114: Bearing mounting portion 116: Locking step 200: Transfer roller 210: Drive roller 212: Drive sprocket 220: Guide plate 300: Drive transmission member 310: Driven sprocket 320 : Passive chain 360 : Pulley 400: Drive motor 410: Main sprocket 500 : Conveyor belt 600 : Belt tension adjustment unit 610 : Fixing bar 612 : Fixed horizontal piece 614 : Fixed vertical piece 616 : Fixing hole 618 : Hanger 620 : Tension adjustment movable bar 622 : Tension member connection hole 624 : Left / Right tension adjustment part 626 : Adjustment fixing hole 627 : Tension adjustment space 628 : Fastening hole 630 : Left / Right adjustment bolt 640 : Tension adjustment bar 642 : Adjustment fastening hole 644 : Hanger attachment hole 650 : Center adjustment bolt 660 : Tension coil spring 700 : Drag panel 800 : Tension member 810 : First tension member 820 : Second tension member 900 : Control controller

Claims

Claim 1 A base frame (100) formed in a rectangular shape inside the closed cargo compartment of a truck by combining a plurality of frames to correspond to the front, rear, left, and right inner floors along the rear longitudinal direction where a rear door is provided at the front of the driver's seat side of the closed cargo compartment of the truck; a roller frame (110) installed on the upper surface of the frame along the left and right longitudinal direction of the base frame, having a plurality of "U" shaped roller fitting grooves (112) formed open upwards on the same line facing each other on the left and right sides; a plurality of transfer rollers (200) that rotate freely while rolling motion, with both ends of the roller shafts bearing-coupled to the roller fitting grooves (112) formed in pairs facing each other on the same line being detachably attached and attached, and which are fitted perpendicularly to the longitudinal direction of the roller frame (110) so as to prevent interference with the front inner surface of the driver's seat side of the closed cargo compartment of the truck, such that the next transfer roller of the transfer roller closest to the front inner surface of the driver's seat side among the plurality of transfer rollers (200) is coupled to each other A drive roller (210) having both ends of a roller shaft with a bearing coupled between opposing roller fitting grooves (112) so as to be detachably coupled, and a drive sprocket (212) perpendicular to the axis line fixedly coupled to one side of the outer circumference of the roller shaft; and a disc-shaped guide rotating plate (220) fixedly coupled to the roller shaft so as to rotate together when the transfer roller and the drive roller rotate, between the ends of the transfer roller (200) and the drive roller (210) and the roller frame (110) so as to prevent interference by contacting the roller frame (110) at each end of the transfer roller (200) and the drive roller (210); A drive transmission member (300) having a rear side transfer roller formed with a door for loading and unloading cargo in a closed cargo compartment of a truck, a drive roller and a drive roller, and a drive chain (320) formed to transmit power of the drive roller according to the rotation of the drive sprocket (212), wherein a drive sprocket (310) is axially coupled between the guide rotating plate (220) and each roller at both left and right ends of the drive roller between the rear side transfer roller and the drive roller;A main sprocket (410) that generates power to rotate the drive sprocket in forward and reverse directions by being chain-coupled to the drive sprocket (212) of the drive roller (210) is coupled to the motor shaft, and a drive motor (400) coupled to one side of the outer lower surface of the truck; A conveyor belt (500) formed by wrapping the entire front and rear of a conveyor roller coupled to the roller frame (110) and rotating infinitely, extending the continuous perimeter length in a straight line to form a length corresponding to half to 60% of the total length, and covering only the upper portions of each conveyor roller and drive roller arranged to the rear while wrapping the conveyor roller coupled to the front end; a belt tension adjustment unit (600) coupled to the front end of the conveyor belt (500) wrapping the conveyor roller on the rear door side of the truck and arranged to adjust the tension of the conveyor belt; a horizontal piece (710) formed with one end coupled to the front end of the conveyor belt formed above the conveyor roller on the driver's seat side of the truck, and a vertical piece (720) formed by being bent at a right angle toward the driver's seat side of the horizontal piece and standing upright, arranged to move horizontally together with the conveyor belt to support and brace the load of the cargo and to adjust the space according to the amount of cargo loaded. A drag panel (700); and a tension member (800) formed from the belt tension adjustment unit to the left and right sides of the conveyor belt, extending from the conveyor roller where the rear door of the truck covered by the conveyor belt is located to the drive roller side, so as to perform the role of a conveyor belt according to the remaining length of the conveyor belt formed to half to 60% of its length so that the conveyor belt (500) rotates smoothly on the conveyor roller and the drive roller, and to perform conveyor belt tension adjustment by the belt tension adjustment unit, wherein one tension member is formed from the belt tension adjustment unit to the left and right sides of the conveyor belt and the drive roller side where the conveyor belt does not cover, and is coupled to the drag panel; and the other tension member is formed symmetrically from the belt tension adjustment unit to the left and right sides of the lower side of the conveyor roller and the drive roller not covered by the conveyor belt, and is coupled to the drag panel (700); and a drive motor (400) connected via wired or wireless connection to one side of the rear door of the closed cargo compartment of the truck to control the ON / OFF and forward / reverse rotation of the drive motor (400). Control controller (900);A belt tension adjustment unit of a cargo loading / unloading device installed in a box truck, characterized by being formed as follows. Claim 2 A belt tension adjustment unit for a cargo loading / unloading device installed in a truck, characterized in that, in claim 1, the “U” shaped roller fitting groove (112) of the roller frame (110) is formed with a “U” shaped bearing seating portion (114) in which a bearing coupled to both ends of the roller shaft of the transfer roller (200) or the driving roller (210) is seated, and a “U” shaped locking step (116) smaller than the diameter of the bearing seating portion to prevent the bearing from being dislodged outward from the bearing seating portion. Claim 3 In claim 1, the belt tension adjustment unit (600) is formed with a width corresponding to the width of the conveyor belt (500) and has a fixed horizontal piece (612) formed to be fixedly coupled to the leading end of the conveyor belt that surrounds the transfer roller on the rear door side of the truck, and a fixed vertical piece (614) formed vertically on one side of the fixed horizontal piece (612) at a height that moves back and forth without interference with the transfer roller, and a fixing bar (610) having a fixing hole (616) symmetrically provided on the fixed vertical piece (614) and a plurality of hook holes (618) formed between the fixing holes (616); and a tension member coupling hole (622) symmetrically provided on the left and right sides so that a tension member (800) is coupled thereto, which is formed as a rectangular housing with open top and bottom having a length corresponding to the width of the conveyor belt (500) and is opposite to the fixing bar (610). A tension-adjusting movable bar (620) is formed such that a tension-adjusting space (627) is formed, which has a tension adjustment distance from the center of the tension-adjusting space (626) to the surface facing the fixing bar (610), and a fastening hole (628) is formed on the surface facing the fixing bar (610) of a rectangular housing between the left and right tension-adjusting parts (624); a left and right adjustment bolt (630) is coupled through the fixing hole (616) of the fixing bar (610) and is fastened with a nut within the tension adjustment space (627) by penetrating the adjustment coupling hole (626) of the tension-adjusting movable bar (620); and a tension-adjusting movable bar (620) corresponding to the distance between the left and right tension-adjusting parts (624). A tension adjustment bar (640) formed long with a width and positioned between a tension adjustment movable bar (620) and a fixing bar (610), having an adjustment fastening hole (642) formed in line with the fastening hole (628) and a hanging fastening hole (644) formed in line with the hanging hole (618); and a central adjustment bolt (650) coupled through the fastening hole (628) of the tension adjustment movable bar (620) and fastened with a nut by penetrating the adjustment fastening hole (644) of the tension adjustment bar (640);A belt tension adjustment unit of a cargo loading / unloading device installed in a truck, characterized by being formed of a plurality of tension coil springs (660) arranged such that both ends are hooked and connected to the hook hole (618) of the fixing bar (610) and the hook fastening hole (644) of the tension adjustment bar (640) to pull the fixing bar (610) and the tension adjustment movable bar (620). Claim 4 In claim 3, the tension member (800) is formed symmetrically on the left and right sides of the tension adjustment movable bar (620) such that the front left and right tension member coupling holes are connected through the guide rotating plate (220) formed on the left and right sides of the transfer roller (200) where the rear door of the truck covered by the conveyor belt is located, with a width corresponding to the width of the conveyor belt (500), and the guide rotating plate (220) formed on the left and right sides of the drive roller (210) and the drive roller, and the first tension member (810) is connected to the drag panel as its left and right ends pass between the guide rotating plate (220) formed on the left and right sides of the drive roller and the drive roller, with a width corresponding to the width of the conveyor belt (500); and the rear left and right tension member coupling holes among the tension member coupling holes (622) are connected through the rear side so that the conveyor belt does not cover A belt tension adjustment unit for a cargo loading and unloading device installed in a truck, characterized by being formed by a second tension member (820) that is coupled to a drag panel located above the driving roller and the transfer roller, with the left and right ends passing between the guide rotating plate (220) formed on the left and right sides of the transfer roller (220) and the lower side of the transfer roller, and the guide rotating plate (220) formed on the left and right sides of the transfer roller (220) on the front side of the truck and the lower side of the transfer roller. Claim 5 A belt tension adjustment unit for a cargo loading / unloading device installed in a truck, characterized in that, in claim 1, a pulley (360) is further formed between the guide rotating plate (220) coupled to both left and right ends of the transfer roller (200) and the driving roller (210) and between each roller or between the guide rotating plate (220) and the driven sprocket (310). Claim 6 A belt tension adjustment unit for a cargo loading / unloading device installed in a truck, characterized in that, in claim 1, a “┗┛” shaped dirt catcher (102) is formed so that dust or foreign matter generated from cargo loaded on the bottom side of the base frame (100) falls to the lower part of the conveyor roller and is received, and the rear door is opened to allow the dust or foreign matter received to be removed by being pulled out and pulled in like a drawer to the outside of the rear door. Claim 7 In claim 1, a roller frame (110) is coupled to the base frame (100), a plurality of transfer rollers (200) are coupled to the roller frame, guide rotating plates (220) are coupled to both ends of each transfer roller, and two or more conveyor belts (500) with a length of half to 60% between the transfer rollers are coupled by a belt tension adjustment unit (600) and a tension member (800) to correspond to the width of the space where the loading / unloading transfer means configuration of the truck is installed, wherein the transfer rollers (200) of the loading / unloading transfer means adjacent to the transfer rollers of the loading / unloading transfer means are axially connected so as to be driven as one, and a drag panel (700) is formed as a single unit with a width corresponding to the total width of two or more loading / unloading transfer means, and the tension member (800) of each loading / unloading transfer means is a single unit with the belt tension adjustment unit (600) coupled to each conveyor belt (500). A belt tension adjustment unit for a cargo loading / unloading device installed in a truck, characterized in that a conveyor belt (200) located in a position that does not interfere with installation inside the closed cargo compartment on the driver's side of the truck is connected to a drag panel (700) and, in one of the loading / unloading conveyor means among a plurality of continuously connected loading / unloading conveyor means, is replaced by a drive roller (210) and is chain-coupled to a drive motor (400), and a drive transmission member (300) is coupled to both ends of the conveyor roller and the drive roller so that the drive force of the drive motor (400) is transmitted by the drive roller (210) to the drive transmission member (300), and the conveyor belt (500) and the drag panel (700), which are connected by a tension member (800), are configured to operate forward and backward during the loading / unloading of cargo while maintaining tension through tension adjustment by a belt tension adjustment unit (600).

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