Heavy truck dumper tarpaulin mechanism

Abstract

The heavy truck dumper tarpaulin mechanism comprises a main guide rail fixed to the outer side of a container assembly, and the main guide rail comprises a horizontal part, a bent part and a vertical part which are sequentially connected; the two main guide rails are slidably connected with a driving tackle, a plurality of driven tackles and an upper tackle which transversely penetrate through the top end of the container assembly and are sequentially arranged. The driving tackle is connected with a chain transmission assembly, and the chain transmission assembly is used for driving the driving tackle to slide on the main guide rail; the driving tackle is connected with the driven tackle closest to the driving tackle through a connecting rod; tarpaulin is mounted on the surfaces of the driving tackle, the plurality of driven tackles and the upper tackle; according to the heavy truck dumper tarpaulin mechanism, when the tarpaulin mechanism is folded, the upper space of a front breast board of a container in the vertical direction is fully utilized, the occupation of a conventional horizontal pushing tarpaulin mechanism on the front-back longitudinal space of the whole truck is reduced, and the influence on loading of the front portion of the container is reduced to the maximum extent.

Description

Technical Field

[0001] The invention relates to the technical field of heavy-duty dump trucks, in particular to a tarpaulin mechanism for a heavy-duty dump truck. Background Art

[0002] Heavy-duty dump truck tarpaulin is a kind of tarpaulin used to cover heavy-duty dump trucks. It can effectively protect vehicles and goods from bad weather, prevent rain, sunlight, dust, etc. from entering the interior of the vehicle, and keep the goods clean and safe. Heavy-duty dump truck tarpaulin is also detachable, foldable, easy to install and maintain, and convenient for users to use and manage. Heavy-duty dump truck tarpaulin is gradually entering the market with the increasing requirements of urban sanitary environment. Some local regulations also stipulate that heavy-duty dump trucks must be covered with tarpaulins when transporting goods. For example, Guangzhou local standard DB4401 / T11-2022 "Signs and monitoring terminals for construction waste transportation vehicles, specifications and sealing of carriages" has detailed and clear provisions on heavy-duty dump truck tarpaulins. At present, the flexible tarpaulin mechanisms of heavy-duty dump trucks on the market are mostly flat push type and overall flip type. The flat push type tarpaulin mechanism will be folded at the front of the cargo box, and the overall flip type realizes the stacking of tarpaulins by arranging spring reels at the front of the cargo box.

[0003] The push-type tarpaulins for heavy-duty dump trucks currently on the market will be folded horizontally in front of the gantry, occupying a large amount of longitudinal space in the cargo box. In addition, the existing tarpaulin mechanism has no rigid support in the middle of the overall flip-type tarpaulin. The middle part will sink downward due to gravity, encroaching on the cargo box space, and water accumulation and sinking in the middle part will be more serious on rainy days. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a tarpaulin mechanism for a heavy-duty dump truck, which can solve the existing problems.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] The present invention is realized by the following technical scheme: a tarpaulin mechanism for a heavy-duty dump truck, comprising a main rail fixed on the outside of a cargo box assembly, the main rail comprising a horizontal portion, a curved portion and a vertical portion connected in sequence; two of the main rails are slidably connected to an active pulley, a plurality of driven pulleys and an upper pulley that are arranged in sequence and cross the top of the cargo box assembly; the active pulley is connected to a chain transmission assembly, and the chain transmission assembly is used to drive the active pulley to slide on the main rail; the active pulley is connected to the closest driven pulley via a connecting rod; the surfaces of the active pulley, the plurality of driven pulleys and the upper pulley are installed with tarpaulins;

[0007] When the tarpaulin is folded, the plurality of driven pulleys and the upper pulley are in the vertical portion, and the active pulley is in the connection between the horizontal portion and the curved portion;

[0008] When the tarpaulin is unfolded, the active pulley and the plurality of driven pulleys are in the horizontal portion, and the upper pulley is at the bottom end of the vertical portion.

[0009] Furthermore, the active pulley is rotatably connected to the rear flip frame, and a tarpaulin is installed on the surface of the rear flip frame; a spring is provided between the active pulley and the rear flip frame; the cargo box assembly includes a front railing, a rear railing and side panels; two side panels are connected between the front railing and the rear railing to form a carriage; the side surfaces of the side panels are fixed with rear limit blocks of the active pulley, and flip uphill panels are provided on both sides of the inner wall of the rear railing; the flip uphill panel and the rear limit block of the active pulley are cooperatively connected to the rear flip frame.

[0010] Furthermore, the rear flip frame includes a limit rod, a connecting plate, a side longitudinal beam, an inner longitudinal beam, a long arc plate, a tail cross beam and a sliding seat; the two ends of the tail cross beam are respectively welded with side longitudinal beams, and the other ends of the two side longitudinal beams are welded through long arc plates; a plurality of inner longitudinal beams are welded between the long arc plate and the tail cross beam for reinforcement; a sliding seat is fixed to the side of the side longitudinal beam, and the sliding seat is connected to the flip uphill plate; and a connecting plate is fixed to the outer side of the side longitudinal beam, and the connecting plate is connected to the limit rod; the limit rod is connected to the rear limit block of the active pulley; the limit rod and the active pulley are connected by a spring.

[0011] Furthermore, the cross section of the limit rod adopts a chamfered "V"-shaped structure, and through holes are provided on the surfaces of the limit rod and the side longitudinal beam; the cross section of the long arc plate adopts a quarter arc structure, and the side longitudinal beam adopts a trapezoidal structure.

[0012] Furthermore, the active pulley includes an active pulley bracket, a first pulley, an outer card, a chain connecting plate, an inner card and a central axis; the central axis passes through the through holes on the surfaces of the limit rod and the side longitudinal beam; the outer card and the inner card are respectively provided on both sides of the central axis, and the outer card and the inner card limit the limit rod and the side longitudinal beam to rotate between the two; the outer surface of the central axis between the outer card and the inner card is provided with a chain connecting plate, and the chain connecting plate is connected to the chain transmission assembly; an active pulley bracket is fixed to the outer side of the outer card, and a plurality of first pulleys are provided on the side of the active pulley bracket; the first pulleys are connected to the main guide rail in coordination.

[0013] Furthermore, the cross-section of the chain connecting plate adopts a "U"-shaped structure, and the chain connecting plate and the central axis are fixed by bolts; the chain connecting plate and the chain transmission assembly are fixed by bolts; threaded holes are provided at both ends of the central axis, and the central axis and the outer card and the inner card are fixed by matching bolts.

[0014] Furthermore, the driven pulley includes a driven pulley bracket, a second pulley and a tarpaulin middle support rod; the driven pulley brackets are respectively fixed to both ends of the tarpaulin middle support rod, and a plurality of second pulleys are provided on the side of the driven pulley bracket; the second pulley is cooperatively connected to the main rail.

[0015] Furthermore, the upper pulley includes an upper pulley bracket, an intermediate bracket, a tarpaulin front support rod, a third pulley and a reinforcing rib, the intermediate brackets are fixed at both ends of the tarpaulin front support rod, and the side of the intermediate bracket is provided with an upper pulley bracket; the inner wall of the upper pulley bracket is fixed with a reinforcing rib, and the inner wall of the upper pulley bracket is provided with a plurality of third pulleys; the third pulley is cooperatively connected to the main rail; the side of the front railing is provided with an upper pulley lower limit block, and the upper pulley lower limit block is cooperatively connected to the reinforcing rib.

[0016] Furthermore, the first pulleys are provided with four symmetrical ones in pairs, the second pulleys are provided with three symmetrical ones, the third pulleys are provided with four symmetrical ones in pairs, and the first pulley, the second pulley and the third pulley are all U-shaped bearing pulleys.

[0017] Furthermore, the chain transmission assembly includes a chain, a sprocket and a drive motor; the two ends of the chain are engaged with sprockets, and one of the sprockets is connected to the drive motor; the chain passes through and is connected to the chain connecting plate by bolts.

[0018] Compared with the prior art, the beneficial effects of the present invention include:

[0019] The heavy-duty truck dump truck tarpaulin mechanism of the present invention fully utilizes the upper vertical space of the front railing of the cargo box when folding, reduces the occupation of the front and rear longitudinal space of the whole vehicle by the conventional flat-push tarpaulin mechanism, and minimizes the impact on the loading of the front part of the cargo box; in addition, the tarpaulin of the present invention is supported and fixed by an active pulley and a plurality of driven pulleys, avoiding the problem of depression in the middle part of the tarpaulin due to insufficient support;

[0020] In addition, the tarpaulin mechanism of the present invention can drive the rear flip frame to rotate when it is pushed horizontally, so as to solve the problem that even if the side panels of the cargo box assembly and the rear tailgate are not level, the cargo box can still be fully covered, thereby achieving complete coverage of the entire cargo box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0022] Figure 1 It is a schematic diagram of the overall unfolding structure of a tarpaulin mechanism for a heavy-duty dump truck of the present invention;

[0023] Figure 2This is a schematic diagram of the overall structure of the embodiment of the present invention after the tarpaulin is removed;

[0024] Figure 3 This is an implementation case of the present invention Figure 2 A in the middle is a diagram of the transformation structure of the enlarged part and the enlarged part;

[0025] Figure 4 A schematic diagram of a connecting rod structure of an implementation example of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the lower limit block of the upper pulley when the upper pulley moves in the implementation case of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the rear overturning frame according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the active pulley structure of an implementation case of the present invention;

[0029] Figure 8 This is a schematic diagram of the main rail structure of an implementation case of the present invention;

[0030] Fig. 9 This is a schematic diagram of the structure of a driven pulley in an embodiment of the present invention;

[0031] Fig.10 This is a schematic diagram of the upper pulley structure of an implementation case of the present invention;

[0032] Fig.11 This is a schematic diagram of the structure of the tarpaulin mechanism when folding according to an embodiment of the present invention.

[0033] Explanation of the markings in the figure: 1. Rear tilt frame; 101. Limit rod; 102. Connecting plate; 103. Side longitudinal beam; 104. Inner longitudinal beam; 105. Long arc plate; 106. Tail cross beam; 107. Sliding seat; 2. Active pulley; 201. Active pulley bracket; 202. First pulley; 203. External card; 204. Chain connecting plate; 205. Internal card; 206. Middle shaft; 3. Spring; 4. Connecting rod; 5. Driven pulley; 501. Driven pulley bracket; 502. Second pulley; 503. Tarpaulin middle support rod; 6. Main guide rail; 601, horizontal part; 602, curved part; 603, vertical part; 7, upper pulley; 701, upper pulley bracket; 702, intermediate bracket; 703, tarpaulin front support rod; 704, third pulley; 705, reinforcing rib; 8, chain drive assembly; 801, chain; 802, sprocket; 9, cargo box assembly; 901, upper pulley lower limit block; 902, flip uphill plate; 903, active pulley rear limit block; 904, front railing; 905, rear railing; 906, side panel; 10, tarpaulin. DETAILED DESCRIPTION

[0034] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0035] A tarpaulin mechanism for a heavy-duty dump truck, such as Figure 1 As shown, the tarpaulin mechanism is installed at the top of the cargo box assembly 9 for covering; the cargo box assembly 9 includes a front fence 904, a rear fence 905 and a side panel 906; two side panels 906 are connected between the front fence 904 and the rear fence 905 to form a carriage; Figure 2 As shown;

[0036] The tarpaulin mechanism includes a main rail 6 fixed to the outside of the cargo box assembly 9, and the main rail 6 includes a horizontal portion 601, a curved portion 602 and a vertical portion 603 connected in sequence. Figure 8 As shown; wherein the horizontal portion 601 is welded and fixed to the side surface of the side panel 906, and the vertical portion 603 is welded and fixed to the side of the front rail 904, the horizontal portion 601 is perpendicular to the vertical portion 603, and the two are connected by a curved portion 602; compared with the traditional main rail with a simple horizontal structure, the main rail of the present invention adds a curved portion 602 and a vertical portion 603 to collect the tarpaulin to the vertical portion 603 area to reduce the area when the tarpaulin is folded.

[0037] The two main guide rails 6 are slidably connected to the active pulley 2, multiple driven pulleys 5 and upper pulley 7 which are arranged in sequence and cross the top of the cargo box assembly 9; illustratively, the active pulley 2 is at the tail of the cargo box assembly 9, and the upper pulley 7 is at the head of the cargo box assembly 9. Specifically, the upper pulley 7 is slidably connected to the vertical portion 603; the present invention is illustrated by taking the number of driven pulleys 5 as eight, but is not limited thereto; the active pulley 2 is connected to the chain transmission assembly 8, and the chain transmission assembly 8 is used to bring The active pulley 2 is driven to slide on the main guide rail 6; the chain transmission assembly 8 includes a chain 801, a sprocket 802 and a driving motor; the two ends of the chain 801 are engaged with the sprockets 802, and one of the sprockets 802 is connected to the driving motor; the chain 801 passes through and is connected to the active pulley 2 by bolts, and when the driving motor drives the sprocket 802 to rotate, the chain 801 can be driven to move, and the movement of the chain 801 can pull the active pulley 2 to move on the main guide rail 6, so as to realize the folding and unfolding of the tarpaulin mechanism;

[0038] The active pulley 2 and the nearest driven pulley 5 are connected via a connecting rod 4; wherein the connecting rod 4 has a structure as follows Figure 4As shown; the surfaces of the active pulley 2, the multiple driven pulleys 5 and the upper pulley 7 are installed with a tarpaulin 10; specifically, the tarpaulin 10 is fixed to the top of the active pulley 2, the eight driven pulleys 5 and the upper pulley 7 by bolts and pressure strips;

[0039] When the tarpaulin 10 is folded, Fig.11 As shown, the plurality of driven pulleys 5 and the upper pulley 7 are located in the vertical portion 603, and the active pulley 2 is located at the connection between the horizontal portion 601 and the curved portion 602;

[0040] When the tarpaulin 10 is unfolded, Figure 1 As shown, the active pulley 2 and the plurality of driven pulleys 5 are located in the horizontal portion 601 , and the upper pulley 7 is located at the bottom end of the vertical portion 603 .

[0041] In order to cover the rear of the cargo box assembly 9 by rotating it, the problem of covering the entire cargo box even if the rear tailgate 905 and the side panel 906 are at different heights can be solved; the active pulley 2 is rotatably connected to the rear flip frame 1, and a tarpaulin 10 is installed on the surface of the rear flip frame 1; the tarpaulin 10 is fixed by pressure strips and bolts; a spring 3 is provided between the active pulley 2 and the rear flip frame 1; the side of the side panel 906 is fixed with an active pulley rear limit block 903, and the inner wall of the rear tailgate 905 is provided with a flip uphill plate 902 on both sides, and the flip uphill plate 902 adopts an inclined plate structure; the flip uphill plate 902 and the active pulley rear limit block 903 are cooperatively connected to the rear flip frame 1.

[0042] Specifically, Figure 3 and Figure 6As shown, the rear flip frame 1 includes a limit rod 101, a connecting plate 102, a side longitudinal beam 103, an inner longitudinal beam 104, a long arc plate 105, a tail cross beam 106 and a slide 107; the two ends of the tail cross beam 106 are respectively welded with side longitudinal beams 103, and the other ends of the two side longitudinal beams 103 are welded through long arc plates 105; a plurality of inner longitudinal beams 104 are welded between the long arc plates 105 and the tail cross beam 106 for reinforcement; a slide 107 is fixed to the side of the side longitudinal beam 103, and the slide 107 is connected to the flip uphill plate 902; and a connecting plate 102 is welded and fixed to the outer side of the side longitudinal beam 103, and the connecting plate 102 is welded and connected to the limit rod 101; the limit rod 101 is connected to the rear limit block 903 of the active pulley; the limit rod 101 is connected to the active pulley 2 through a spring 3. The cross section of the limit rod 101 adopts a chamfered "V"-shaped structure, and through holes are provided on the surfaces of the limit rod 101 and the side longitudinal beam 103; the cross section of the long arc plate 105 adopts a quarter arc structure, and the side longitudinal beam 103 adopts a trapezoidal structure. The tarpaulin 10 is fixed to the lower side of the rear flip frame 1 by bolts and pressure strips. The quarter arc surface of the long arc plate 105 can ensure that the tarpaulin 10 is in contact with the outer surface of the arc surface of the long arc plate 105 when the rear flip frame 1 completes a 90° flip. The large radius transition can ensure that the tarpaulin is not easily damaged when the rear flip frame 1 is flipped. The slide 107 is fixed to the lower part of the side longitudinal beam 103 by bolts (the top is the top and the bottom is the bottom when the rear flip frame 1 is covered). When the rear flip frame 1 is translated toward the front railing 904, the slide 107 will contact the flip uphill plate 902, and the flip uphill plate 902 will resist the slide 107, so that when the active pulley 2 drives the rear flip frame 1 to move toward the front end of the cargo box assembly 9, it can drive the rear flip frame 1 to apply force upward to force the rear flip frame 1 to start flipping when it is forced to move forward.

[0043] The active pulley 2 of the present invention comprises an active pulley bracket 201, a first pulley 202, an outer card 203, a chain connecting plate 204, an inner card 205 and a central shaft 206; Figure 7As shown, the central axis 206 passes through the φ50 through hole on the surface of the limit rod 101 and the side longitudinal beam 103; the two sides of the central axis 206 are respectively provided with an outer card 203 and an inner card 205, and the outer card 203 and the inner card 205 limit the rotation of the limit rod 101 and the side longitudinal beam 103 therebetween; the outer surface of the central axis 206 between the outer card 203 and the inner card 205 is provided with a chain connecting plate 204, and the chain connecting plate 204 is connected to the chain transmission assembly 8; an active pulley bracket 201 is fixed to the outer side of the outer card 203, and a plurality of first pulleys 202 are provided on the side of the active pulley bracket 201; the first pulley 202 is cooperatively connected to the main guide rail 6. That is, the active pulley bracket 201 is welded together with the outer card 203, and the central axis 206 at the corresponding installation position is drilled with a threaded hole. The outer card 203 and the inner card 205 can be installed and fixed with the threaded hole of the central axis 206. The first pulley 202 is installed at four corresponding hole positions on the active pulley bracket 201, and the upper end of the chain connecting plate 204 is fixed to the central axis 206 by bolts, and the lower end of the chain connecting plate 204 is fixed to the chain transmission assembly 8 by bolts. The chain 801 in the chain transmission assembly 8 can drive the active pulley to slide forward and backward along the main guide rail 6 during forward and reverse rotation; when the active pulley 2 moves forward to the curved portion 602 of the main guide rail 6, the connecting rod 4 can also push the driven pulley 5 to turn and move upward; the cross-section of the chain connecting plate 204 adopts a "U"-shaped structure.

[0044] The driven pulley 5 includes a driven pulley bracket 501, a second pulley 502 and a tarpaulin middle support rod 503; Fig. 9 As shown, driven pulley brackets 501 are fixed to both ends of the tarpaulin middle support rod 503, and a plurality of second pulleys 502 are provided on the side of the driven pulley bracket 501; the second pulleys 502 are connected to the main guide rail 6 in cooperation. The tarpaulin 10 is fixed on the top of the middle support rod 503 of the tarpaulin by using self-tapping screws and pressure strips. There are three second pulleys 502 on the driven pulley bracket 501 on each side. The main guide rail 6 passes through the middle of the pulley group to ensure that the driven pulley 5 can slide smoothly on the main guide rail 6. There is a second pulley 502 on the upper part of the main guide rail 6 and two second pulleys 502 on the lower part of the main guide rail 6. This is to ensure that when the driven pulley 5 passes through the curved part 602 of the main guide rail 6, the front lower second pulley 502 will be suspended briefly, and only the two rear second pulleys 502 can slide smoothly on the curved part 602 of the main guide rail 6 and complete the arc turn. After the turn is completed, the driven pulley 5 will be stacked on the vertical part of the main guide rail 6. At this time, there are still three second pulleys 502 on each side that are in contact with the main guide rail 6.

[0045] The upper pulley 7 includes an upper pulley bracket 701, an intermediate bracket 702, a tarpaulin front support rod 703, a third pulley 704 and a reinforcing rib 705. Fig.10As shown, intermediate brackets 702 are fixed at both ends of the tarpaulin front support rod 703, and the side of the intermediate bracket 702 is provided with an upper pulley bracket 701; the inner wall of the upper pulley bracket 701 is fixed with a reinforcing rib 705, and the inner wall of the upper pulley bracket 701 is provided with a plurality of third pulleys 704; the third pulley 704 is connected to the main rail 6; the side of the front rail 904 is provided with an upper pulley lower limit block 901, as shown in FIG. Figure 5 As shown, the upper pulley lower limit block 901 cooperates with the connecting reinforcing rib 705. That is, the tarpaulin 10 is fixed to the bottom and front side holes of the tarpaulin front support rod 703 by bolts and pressure strips, and there are four third pulleys 704 on each side of the upper pulley bracket 701, and the third pulley 704 passes through the main rail 6 and can slide smoothly on the vertical part 603 of the main rail 6. The upper pulley lower limit block 901 will not hinder the driven pulley 5. Due to the existence of the reinforcing rib 705, the upper pulley 7 will be prevented from sliding to the curved part 602 and the horizontal part 601, so that the upper pulley only moves on the vertical part 603 of the main rail 6, ensuring that the tarpaulin 10 at the front end of the cargo box assembly 9 can always cover the cargo box completely.

[0046] The first pulley 202 is provided with four symmetrical ones, the second pulley 502 is provided with three; the third pulley 704 is provided with four symmetrical ones; the first pulley 202, the second pulley 502 and the third pulley 704 are all U-shaped bearing pulleys. The first pulley 202, the second pulley 502 and the third pulley 704 are connected with the circular main guide rail 6, and can ensure that each pulley slides smoothly on the main guide rail 6, and the tarpaulin 10 is fixed on each pulley assembly.

[0047] The active rear flip frame 1 of the present invention is connected to both sides of the active pulley 2 by springs 3. In the free state, that is, when the tarpaulin mechanism is folded, the spring 3 flips and pulls the rear flip frame 1 to a vertical position. At this time, the spring 3 is in its original state, and the connecting plate 102 just contacts the chain connecting plate 204, ensuring that the rear flip frame 1 remains in a vertical position without external force. Figure 3 In the second state, when the tarpaulin is unfolded, the active pulley 2 slides to the tail of the cargo box assembly 9. Due to the restriction of the rear limit block 903 of the active pulley, the limit rod 101 drives the entire rear flip frame 1 to flip 90° and lay flat on the tail of the cargo box assembly 9. Figure 3 The first state in .

[0048] The use process of the present invention includes:

[0049] The unfolding process of the tarpaulin mechanism: (In this embodiment, the moving direction of the front tailgate 904 of the cargo box is referred to as forward, and the moving direction of the rear tailgate 905 of the cargo box is referred to as backward)

[0050] See also Fig.11At this time, the tarpaulin mechanism is in a folded state, and the driving motor drives the chains 801 on both sides of the cargo box assembly 9 to rotate through the sprocket 802, and the chain 801 drives the active pulley 2 to slide backward on the main rail 6. The active pulley 2 pulls the lowest driven pulley 5 (i.e., the driven pulley 5 closest to the active pulley 2) on the main rail 6 through the connecting rod 4. It first slides downward from the vertical portion 603, then passes through the curved portion 602, and then passes through the horizontal portion 601. The remaining seven driven pulleys 5 and one upper pulley 7 also slide downward and backward under the force of gravity and the pull of the tarpaulin. All the driven pulleys 5 will slide to the horizontal part of the main rail 6, and the upper pulley 7 will stop at the curved portion 602 of the main rail 6 under the limiting action of the upper pulley lower limit block 901; Figure 3 and Figure 6 As shown, after the active pulley 2 slides backward until the limit rod 101 hits the rear limit block 903 of the active pulley, the active pulley 2 will continue to move backward, and the limit rod 101 will overcome the tension of the spring 3 to drive the rear flip frame 1 to flip backward until the middle axis 206 contacts the front railing 904, and the rear flip frame 1 just flips to a horizontal position. At this time, the tarpaulin mechanism is fully unfolded and completely covers the upper part of the cargo box assembly 9, and the tarpaulin mechanism completes the unfolding process.

[0051] Tarpaulin folding process:

[0052] like Figure 3 and Figure 6 As shown, the driving motor drives the chains 801 on both sides of the cargo box assembly 9 to rotate in the opposite direction through the sprocket 802, and the chain 801 drives the active pulley 2 to slide forward on the main guide rail 6, and the limit rod 101 will be separated from the rear limit block 903 of the active pulley. At this time, the slide seat 107 will contact the rear limit block 903 of the active pulley. The rear limit block 903 of the active pulley is a forward and upward slope, and the rear flip frame 1 will be forced to start rotating. The spring 3 pulls the rear flip frame 1 to flip to a vertical position, and at the same time, the connecting plate 102 just hits the chain connecting plate 204 to ensure that the rear flip frame 1 remains in a vertical position in the absence of other external forces. The whole process is to Figure 3 The first state in changes to the second state.

[0053] like Figure 1 and Figure 2 As shown, the driving motor drives the active pulley 2 to slide forward on the main rail 6 through the chain 801, and the active pulley 2 pushes the rearmost driven pulley 5 to move forward through the connecting rod 4 until it reaches the curved portion 602 of the main rail 6, and starts to move upward along the curved portion 602, and finally all the driven pulleys 5 and the upper pulley 7 will be pushed to the upper portion by the connecting rod 4. Fig.11 In the position shown, the active pulley 2 stops and is locked. At this time, the tarpaulin mechanism is in a folded state from bottom to top between the rear flip frame 1 and the front railing 904 of the cargo box, and the tarpaulin mechanism completes the folding action.

[0054] The main guide rail 6 of the present invention is divided into three sections: horizontal, curved and vertical. When the tarpaulin is folded, the driven pulley 5 and the upper pulley 7 all slide on the main guide rail 6 and are stacked upward on the front railing 904 of the cargo box assembly 9; a reinforcing rib 705 is welded on the inner side of the upper pulley bracket 701, and the reinforcing rib 705 contacts the upper pulley lower limit block 901 when sliding downward, thereby limiting the upper pulley 7 from continuing to slide toward the curved portion 602. The driven pulley bracket 501 of the driven pulley 5 has shortened or no reinforcing ribs at this point, so that it can just pass through the upper pulley lower limit block 901 when sliding upward, without It affects the passability of the driven pulley 5 in the curved portion 602 and the vertical portion of the main guide rail 6; the active pulley 2 is connected to the driven pulley 5 through the connecting rod 4, and the active pulley 2 can push the driven pulley 5 and the upper pulley 7 to move forward and upward to stack, and the tarpaulin can be used to pull other driven pulleys 5 and the upper pulley 7 downward and backward to unfold; the three second pulleys 502 that make up the driven pulley 5 are U-shaped pulleys, which are arranged with one on the top and two on the bottom. When the driven pulley passes through the curved portion 602 of the main guide rail 6, the front lower pulley will be out of contact, leaving only two pulleys in contact with the curved portion, thereby increasing the passability. The rear flip frame 1 can rotate on the middle axis 206 of the active pulley 2. After the active pulley 2 slides backward until the limit rod 101 hits the rear limit block 903 of the active pulley, the active pulley 2 will continue to move backward, and the limit rod 101 will overcome the tension of the spring 3 to drive the active rear flip frame 1 to flip backward until the middle axis 206 contacts the front part of the rear column, and the rear flip frame 1 just flips to the horizontal position; when the active pulley slides forward, the limit rod 101 will disengage from the rear limit block 903 of the active pulley, and the slide seat 107 will contact the rear limit block 903 of the active pulley. The rear limit block 903 of the active pulley is a forward and upward slope, and the rear flip frame 1 will be forced to start rotating. The spring 3 pulls the rear flip frame 1 to flip to a vertical position. At this time, the connecting plate 102 just contacts the chain connecting plate 204, ensuring that the rear flip frame 1 remains in a vertical position under the tension of the spring 3.

[0055] The tarpaulin mechanism of the present invention fully utilizes the vertical upper space of the front tailgate of the cargo box when folding, reducing the occupation of the front and rear longitudinal space of the entire vehicle by the conventional push-flat tarpaulin mechanism, and minimizing the impact on the loading of the front of the cargo box; at the same time, the tarpaulin mechanism of the present invention can drive the rear flip frame to rotate when it is pushed horizontally, solving the problem of being able to fully cover the cargo box even if the side panels of the cargo box assembly are not level with the rear tailgate.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0059] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A tarpaulin mechanism for a heavy-duty dump truck, characterized in that: The invention comprises a main guide rail (6) fixed on the outside of a cargo box assembly (9), wherein the main guide rail (6) comprises a horizontal portion (601), a curved portion (602) and a vertical portion (603) connected in sequence; two of the main guide rails (6) are slidably connected to an active pulley (2), a plurality of driven pulleys (5) and an upper pulley (7) which are arranged in sequence and cross the top of the cargo box assembly (9); the active pulley (2) is connected to a chain transmission assembly (8), and the chain transmission assembly (8) is used to drive the active pulley (2) to slide on the main guide rail (6); the active pulley (2) and the closest driven pulley (5) are connected via a connecting rod (4); a tarpaulin (10) is installed on the surface of the active pulley (2), the plurality of driven pulleys (5) and the upper pulley (7); When the tarpaulin (10) is folded, the plurality of driven pulleys (5) and the upper pulley (7) are located in the vertical portion (603), and the active pulley (2) is located at the connection between the horizontal portion (601) and the curved portion (602); When the tarpaulin (10) is unfolded, the active pulley (2) and the plurality of driven pulleys (5) are located in the horizontal portion (601), and the upper pulley (7) is located at the bottom end of the vertical portion (603).

2. A heavy-duty dump truck tarpaulin mechanism according to claim 1, characterized in that: The active pulley (2) is rotatably connected to the rear flip frame (1), and a tarpaulin (10) is installed on the surface of the rear flip frame (1); a spring (3) is provided between the active pulley (2) and the rear flip frame (1); the cargo box assembly (9) includes a front railing (904), a rear railing (905) and a side panel (906); two side panels (906) are connected between the front railing (904) and the rear railing (905) to form a carriage; the side of the side panel (906) is fixed with an active pulley rear limit block (903), and both sides of the inner wall of the rear railing (905) are provided with a flip uphill plate (902); the flip uphill plate (902) and the active pulley rear limit block (903) are cooperatively connected to the rear flip frame (1).

3. The heavy-duty dump truck tarpaulin mechanism according to claim 2, characterized in that: The rear tilt frame (1) comprises a limit rod (101), a connecting plate (102), a side longitudinal beam (103), an inner longitudinal beam (104), a long arc plate (105), a tail cross beam (106) and a sliding seat (107); the two ends of the tail cross beam (106) are respectively welded with the side longitudinal beams (103), and the other ends of the two side longitudinal beams (103) are welded through the long arc plate (105); a plurality of inner longitudinal beams (104) are welded between the long arc plate (105) and the tail cross beam (106). 4) for reinforcement; a sliding seat (107) is fixed to the side of the side longitudinal beam (103), and the sliding seat (107) is connected to the flip uphill plate (902); and a connecting plate (102) is fixed to the outer side of the side longitudinal beam (103), and the connecting plate (102) is connected to the limit rod (101); the limit rod (101) is connected to the rear limit block (903) of the active pulley; the limit rod (101) and the active pulley (2) are connected by a spring (3).

4. A heavy-duty dump truck tarpaulin mechanism according to claim 3, characterized in that: The cross section of the limit rod (101) adopts a chamfered "V"-shaped structure, and through holes are provided on the surfaces of the limit rod (101) and the side longitudinal beam (103); the cross section of the long arc plate (105) adopts a quarter arc structure, and the side longitudinal beam (103) adopts a trapezoidal structure.

5. The heavy-duty dump truck tarpaulin mechanism according to claim 4, characterized in that: The active pulley (2) comprises an active pulley bracket (201), a first pulley (202), an outer clamp (203), a chain connecting plate (204), an inner clamp (205) and a central axis (206); the central axis (206) penetrates through holes on the surfaces of the limiting rod (101) and the side longitudinal beam (103); an outer clamp (203) and an inner clamp (205) are respectively arranged on both sides of the central axis (206); the outer clamp (203) and the inner clamp (205) connect the limiting rod (101) and the side longitudinal beam (103) to each other. The side longitudinal beam (103) is restricted to rotate between the two; a chain connecting plate (204) is provided on the outer surface of the central axis (206) between the outer card (203) and the inner card (205), and the chain connecting plate (204) is connected to the chain transmission assembly (8); an active pulley bracket (201) is fixed to the outer side of the outer card (203), and a plurality of first pulleys (202) are provided on the side of the active pulley bracket (201); the first pulleys (202) are connected to the main guide rail (6).

6. A heavy-duty dump truck tarpaulin mechanism according to claim 5, characterized in that: The cross section of the chain connecting plate (204) adopts a "U"-shaped structure, and the chain connecting plate (204) and the middle shaft (206) are fixed by bolts; the chain connecting plate (204) and the chain transmission assembly (8) are fixed by bolts; threaded holes are provided at both ends of the middle shaft (206), and the middle shaft (206) and the outer clamp (203) and the inner clamp (205) are fixed by matching bolts.

7. The heavy-duty dump truck tarpaulin mechanism according to claim 6, characterized in that: The driven pulley (5) comprises a driven pulley bracket (501), a second pulley (502) and a tarpaulin middle support rod (503); the driven pulley bracket (501) is fixed to both ends of the tarpaulin middle support rod (503), and a plurality of second pulleys (502) are provided on the side of the driven pulley bracket (501); the second pulley (502) is connected to the main guide rail (6).

8. The heavy-duty dump truck tarpaulin mechanism according to claim 7, characterized in that: The upper pulley (7) comprises an upper pulley bracket (701), an intermediate bracket (702), a tarpaulin front support rod (703), a third pulley (704) and a reinforcing rib (705); the intermediate brackets (702) are fixed at both ends of the tarpaulin front support rod (703), and the upper pulley bracket (701) is provided on the side of the intermediate bracket (702); the inner wall of the upper pulley bracket (701) is fixed with a reinforcing rib (705), and the inner wall of the upper pulley bracket (701) is provided with a plurality of third pulleys (704); the third pulley (704) is connected to the main guide rail (6); the side of the front railing (904) is provided with an upper pulley lower limit block (901), and the upper pulley lower limit block (901) is connected to the reinforcing rib (705).

9. The heavy-duty dump truck tarpaulin mechanism according to claim 8, characterized in that: The first pulley (202) is provided with four symmetrical pulleys in pairs, and the second pulley (502) is provided with three pulleys; the third pulley (704) is provided with four symmetrical pulleys in pairs; the first pulley (202), the second pulley (502) and the third pulley (704) are all U-shaped bearing pulleys.

10. A heavy-duty dump truck tarpaulin mechanism according to any one of claims 1 to 9, characterized in that: The chain transmission assembly (8) comprises a chain (801), a sprocket (802) and a driving motor; the two ends of the chain (801) are engaged with the sprockets (802), and one of the sprockets (802) is connected to the driving motor; the chain (801) passes through and is connected to the chain connecting plate (204) by bolts.

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