Truck tarpaulin installation structure and truck tarpaulin

Abstract

This utility model provides a truck tarpaulin installation structure and a truck tarpaulin that facilitates tarpaulin coverage of the truck bed, prevents the tarpaulin from getting caught when retracted, and also avoids friction between the tarpaulin and the rails when retracted and unfolded. It relates to the field of truck tarpaulin installation technology. The truck tarpaulin installation structure includes support rods spaced along its length on the tarpaulin. The installation structure includes a tarpaulin slide rail installed above the middle of the truck bed. A support bracket is provided in the middle of each support rod, slidingly engaging with the tarpaulin slide rail and located below the tarpaulin. The tarpaulin is supported and slidably installed above the tarpaulin slide rail by the support bracket. Between adjacent support brackets, there is a tarpaulin arching mechanism that, when adjacent support brackets approach each other, causes the tarpaulin above the adjacent support brackets to arch upwards and fold, thereby preventing the tarpaulin from contacting and rubbing against the tarpaulin slide rail below. This utility model can better ensure the service life of the tarpaulin.

Description

Technical Field

[0001] This utility model relates to the field of truck tarpaulin installation technology, specifically a truck tarpaulin installation structure and a truck tarpaulin. Background Technology

[0002] In road freight transport using bulk cargo trucks, tarpaulins are needed to cover the goods to prevent them from getting wet, blown by wind, or falling off due to bumps. To facilitate the tarpaulin's folding and unfolding, one common installation method involves installing horizontal (along the width of the tarpaulin) elastic support rods at intervals along its length. These rods have downward-bending ends and support the tarpaulin. Hanging rings are attached to these support rods, and the tarpaulin is suspended from the truck bed by these rings onto a tarpaulin slide rail above the truck bed. The rings slide against the slide rail, which runs along the length of the truck bed. The front end of the tarpaulin is fixedly connected to the truck bed. Pulling the rear end of the tarpaulin using a motor or manually moves it along the slide rail, causing it to fold up at the front of the truck bed or unfold to cover the truck bed. This tarpaulin installation structure is the simplest, but to prevent the tarpaulin from collapsing under stress in the middle and to maintain its arched shape, the tarpaulin slide rail is usually positioned above the middle of the truck bed.

[0003] Because the tarpaulin is suspended on a tarpaulin rail, it lies below the rail. This means the rear end of the tarpaulin cannot extend beyond the rear support frame of the rail and cover the rear side of the support frame, resulting in the tarpaulin not adequately covering the vehicle compartment. Therefore, as follows... Figure 1 and Figure 2 As shown, to better cover the cargo compartment with the tarpaulin, the applicant has installed a crossbar 5 on the tarpaulin slide rail rear support frame 3 in front of the tarpaulin slide rail rear support frame 3, which is set along the width direction of the cargo compartment 1. The crossbar 5 is positioned between the cargo compartment 1 and the tarpaulin slide rail 4. The height of the crossbar 5 is generally roughly the same as the height of the tarpaulin support rod 91. A gap is provided between the crossbar 5 and the tarpaulin slide rail rear support frame 3 to form a tarpaulin receiving cavity 31. After the tarpaulin 9 is unfolded, its rear end can be draped behind the crossbar 5, which helps the tarpaulin to better cover the cargo compartment. In order not to affect the length of the cargo compartment and the internal space dimensions, the width of the tarpaulin receiving cavity 31 is limited.

[0004] While the aforementioned structure allows the tarpaulin to better cover the carriage, the applicant discovered during actual use that the rear end of the tarpaulin had difficulty entering and exiting the tarpaulin receiving cavity 31. Therefore, as... Figure 3As shown, the applicant mounts the tarpaulin above the tarpaulin slide rail via a bracket that mates with the tarpaulin slide rail. This allows the rear end of the tarpaulin to easily pass over the rear support frame 3 of the tarpaulin slide rail and cover its rear side. Furthermore, the large space behind the rear support frame 3 facilitates the tarpaulin's backward deformation when it is folded up, preventing it from getting caught on the support frame 3 and making folding up easier and less strenuous. The tarpaulin is also less prone to tearing. However, this tarpaulin mounting structure also presents a problem when the tarpaulin folds down, causing friction with the tarpaulin slide rail. This not only increases the pulling force required to fold and unfold the tarpaulin but also easily damages it. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a truck tarpaulin installation structure and truck tarpaulin that can facilitate the tarpaulin covering the truck bed, prevent the tarpaulin from being caught when it is retracted, and also prevent the tarpaulin from rubbing against the track when it is retracted and unfolded.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a truck tarpaulin installation structure, wherein the tarpaulin is provided with flexible elastic support rods spaced apart along its length, the installation structure includes a tarpaulin slide rail installed above the middle of the truck bed, and a support bracket located below the tarpaulin in the middle of the support rods, which slides with the tarpaulin slide rail. The tarpaulin is supported by the support bracket and slidably installed above the tarpaulin slide rail. Between two adjacent support brackets, there is a tarpaulin arching mechanism that causes the tarpaulin above the adjacent support brackets to arch upward and fold when the two adjacent support brackets are close together, thereby avoiding contact and friction between the tarpaulin and the tarpaulin slide rail below.

[0007] Furthermore, the tarpaulin arching mechanism includes a first support and a second support, both of which are elastic elements;

[0008] One end of the first support is fixedly connected to one of the adjacent support slides, and one end of the second support is fixedly connected to the other of the adjacent support slides. The other end of the first support and the other end of the second support are hinged by a horizontal hinge axis perpendicular to the extension direction of the tarpaulin slide rail, so that the first support and the second support can rotate around the horizontal hinge axis to fold the tarpaulin arching mechanism when the two adjacent support slides are close together, and can rotate around the horizontal hinge axis to unfold the tarpaulin arching mechanism when the two adjacent support slides are far apart. When the two adjacent support slides of the tarpaulin arching mechanism are at their maximum distance, the unfolding angle of the tarpaulin arching mechanism is less than 180°.

[0009] Furthermore, when the two adjacent support carriages of the tarpaulin arching mechanism are at their maximum distance, the hinged ends of the first support and the second support of the tarpaulin arching mechanism abut against each other.

[0010] Furthermore, the front end of the truck bed is equipped with a tarpaulin slide rail front support frame that is vertically slidably connected to it, and the rear end of the truck bed is equipped with a tarpaulin slide rail rear support frame that is vertically slidably connected to it. The front end of the tarpaulin slide rail is connected to the tarpaulin slide rail front support frame, and the rear end is connected to the tarpaulin slide rail rear support frame. The truck bed is equipped with a lifting control mechanism that is connected to the tarpaulin slide rail front support frame and the tarpaulin slide rail rear support frame to control their synchronous lifting and lowering.

[0011] Furthermore, it also includes a tarpaulin retractor rope with one end connected to the support rod at the rear end of the tarpaulin and a covering rope with one end connected to the support rod at the rear end of the tarpaulin.

[0012] The other end of the canopy rope extends toward the rear end of the truck bed, and then extends downwards via a fixed pulley located at the rear end of the truck bed.

[0013] The other end of the canopy rope extends towards the front of the truck bed, then reverses direction and extends backward via a fixed pulley located at the front of the truck bed, and then reverses direction and extends downward via a fixed pulley located at the rear of the truck bed.

[0014] This utility model also provides a truck tarpaulin, which is provided with flexible elastic support rods spaced apart along its length. The middle part of the support rod is provided with a support slide located below the tarpaulin. Between two adjacent support slides, there is a tarpaulin arching mechanism that causes the tarpaulin above the adjacent support slides to arch upward and fold when the two adjacent support slides are close together.

[0015] Furthermore, the tarpaulin arching mechanism includes a first support and a second support, both of which are elastic elements;

[0016] One end of the first support is fixedly connected to one of the adjacent support slides, and one end of the second support is fixedly connected to the other of the adjacent support slides. The other end of the first support and the other end of the second support are hinged by a horizontal hinge axis perpendicular to the extension direction of the tarpaulin slide rail, so that the first support and the second support can rotate around the horizontal hinge axis to fold the tarpaulin arching mechanism when the two adjacent support slides are close together, and can rotate around the horizontal hinge axis to unfold the tarpaulin arching mechanism when the two adjacent support slides are far apart. When the two adjacent support slides of the tarpaulin arching mechanism are at their maximum distance, the unfolding angle of the tarpaulin arching mechanism is less than 180°.

[0017] Furthermore, when the two adjacent support carriages of the tarpaulin arching mechanism are at their maximum distance, the hinged ends of the first support and the second support of the tarpaulin arching mechanism abut against each other.

[0018] The beneficial effects of this utility model are as follows: The truck tarpaulin installation structure and tarpaulin of this utility model allow the tarpaulin to be installed above the tarpaulin slide rail. After the tarpaulin is unfolded, its rear end can easily pass over the rear support frame of the tarpaulin slide rail and cover the rear side of the rear support frame. Furthermore, when the tarpaulin is folded up, the large space behind the rear support frame facilitates tarpaulin deformation, making it less likely to be caught on the rear support frame. Folding up the tarpaulin is also easier and less strenuous. The tarpaulin arching mechanism allows the tarpaulin above the two adjacent support frames to arch upwards and fold, thereby avoiding contact and friction between the tarpaulin and the lower tarpaulin slide rail. This makes folding up and unfolding the tarpaulin less strenuous and better ensures the service life of the tarpaulin. Attached Figure Description

[0019] Figure 1 This is a structural diagram of existing technology;

[0020] Figure 2 yes Figure 1 Enlarged view of point B;

[0021] Figure 3 This is a schematic diagram of the structure of this utility model;

[0022] Figure 4 yes Figure 3 Enlarged view of point A;

[0023] Figure 5 This is a schematic diagram of a tarpaulin arch mechanism;

[0024] Figure 6 It is the installation structure of the tarpaulin slide rail;

[0025] The diagram shows: 1. Truck body; 2. Front support frame of tarpaulin slide rail; 3. Rear support frame of tarpaulin slide rail; 4. Tarpaulin slide rail; 5. Crossbar; 6. Tarpaulin upper arch mechanism; 61. Spring piece; 62. First support; 63. Second support; 64. Horizontal hinge shaft; 7. Manual winch; 8. Pull rope; 9. Tarpaulin; 10. Tarpaulin retraction rope; 11. Tarpaulin covering rope; 91. Support rod; 92. Tarpaulin clamp; 93. Support slide. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 3 , Figure 4As shown, the truck tarpaulin installation structure of this utility model includes a tarpaulin 9 with bendable elastic support rods 91 spaced along its length. The support rods 91 can be positioned above or below the tarpaulin 9. When the support rods 91 are positioned above the tarpaulin 9, they can be bonded to the tarpaulin to support it. In this embodiment, the support rods 91 are positioned below the tarpaulin 9, and are clamped and fixed to the tarpaulin by tarpaulin clips 92 spaced along their length to support it. The installation structure includes a tarpaulin slide rail 4 installed above the middle of the truck bed 1. Specifically, the tarpaulin slide rail 4 is installed above the truck bed 1 via a front support frame 2 at the front end and a rear support frame 3 at the rear end. The front and rear support frames 2 and 3 can be fixedly connected to the truck bed 1. The tarpaulin slide rail 4 can be made of rods or ropes. The support rod 91 is provided with a support slide 93 at the middle position between its two ends. This support slide 93 is slidably engaged with the tarpaulin slide rail 4 and located below the tarpaulin 9. The support slide 93 can be connected to the corresponding support rod by bolts, clamps, welding, or other methods, depending on the material of the support rod. The tarpaulin 9 is supported by the support slide 93 and slidably mounted above the tarpaulin slide rail 4, allowing the tarpaulin to slide along the tarpaulin slide rail 4 to unfold or fold. Between two adjacent support slides 93, there is a tarpaulin arching mechanism 6. When two adjacent support slides 93 are close together, the tarpaulin above the two adjacent support slides 93 arches upward and folds, thereby preventing the tarpaulin 9 from contacting and rubbing against the tarpaulin slide rail 4 below.

[0028] When the tarpaulin is unfolded, the middle of the elastic support rod 91 is supported by the support carriage 93, and its two ends bend downwards under the weight of the tarpaulin to form an arch to support the tarpaulin. The support rod 91 is an elastic element, and its bending arc can adapt to change. For example, when the height of the cargo in the truck bed is high, the two ends of the support rod 91 are supported by the cargo, and its arc can adapt to change and decrease, thus facilitating the loading of more cargo. The elastic support rod 91 is preferably made of resin material, which is lightweight and low in cost.

[0029] like Figure 5 As shown, the tarpaulin arching mechanism can be a spring piece 61 with one end fixed to one of the adjacent support slides 93 and the other end fixed to one of the adjacent support slides 93. When the tarpaulin is retracted and the two adjacent support slides 93 are brought closer, the spring piece is subjected to force and its middle part arches and deforms, thereby causing the tarpaulin above it to fold.

[0030] like Figure 3As shown, in this invention, the tarpaulin 9 is supported by the support bracket 93 and slidably mounted above the tarpaulin slide rail 4. This allows the tarpaulin, when unfolded, to easily pass its rear end over the tarpaulin slide rail support bracket 3 and cover its rear side. Furthermore, the large space behind the tarpaulin slide rail support bracket 3 facilitates tarpaulin deformation when the tarpaulin is folded down, making it less likely to get caught on the support bracket 3 and easier to fold. However, because the tarpaulin is mounted above the tarpaulin slide rail 4, it folds downwards under gravity when folded, causing friction between the tarpaulin and the slide rail 4. This increases the pulling force required to fold and unfold the tarpaulin and can easily damage it. Figure 5 As shown, with the tarpaulin arching mechanism 6, when the tarpaulin is retracted and the two adjacent support slides 93 are brought closer together, the tarpaulin arching mechanism 6 can cause the tarpaulin above the two adjacent support slides 93 to arch upwards and fold, thereby avoiding contact and friction between the tarpaulin and the tarpaulin slide rail 4 below. This makes it easier to retract and unfold the tarpaulin, and better ensures the service life of the tarpaulin. In addition, the truck tarpaulin installation structure of this utility model uses the tarpaulin arching mechanism 6 to cause the portion of the tarpaulin above the two support rods, which is higher than the support slides 93 (higher than the tarpaulin slide rail), to arch upwards and fold, without needing to arch and fold the entire tarpaulin between the two support rods, making it easier to retract the tarpaulin.

[0031] like Figure 4 As shown in the embodiment of this utility model, the tarpaulin arching mechanism 6 includes a first support 62 and a second support 63. Both the first support 62 and the second support 63 are elastic elements. One end of the first support 62 is fixedly connected to one of the adjacent support slides 93, and one end of the second support 63 is fixedly connected to the other of the adjacent support slides 93. The other ends of the first support 62 and the second support 63 are hinged to a horizontal hinge axis 64 perpendicular to the extending direction of the tarpaulin slide rail 4, so that the first support 62 and the second support 63 can rotate around the horizontal hinge axis 64 to fold the tarpaulin arching mechanism 6 when the two adjacent support slides 93 are close together, and can rotate around the horizontal hinge axis 64 to unfold the tarpaulin arching mechanism 6 when the two adjacent support slides 93 are far apart. Furthermore, when the two adjacent support slides 93 of the tarpaulin arching mechanism 6 are at their maximum distance, the unfolding angle α of the tarpaulin arching mechanism 6 is less than 180°. The first support 62 and the second support 63 can be connected to the corresponding support slide 93 by means of bolts, riveting, etc.

[0032] In this embodiment of the invention, the first support 62 and the second support 63 are made of elastic plastic. In some embodiments, the first support 62 and the second support 63 are also made of metal.

[0033] Since both the first support 62 and the second support 63 of the tarpaulin arching mechanism 6 are elastic elements, when the tarpaulin is unfolded, increasing the distance between the two adjacent support slides 93, or when the tarpaulin is retracted, decreasing the distance between the two adjacent support slides 93, both the first support 62 and the second support 63 of the tarpaulin arching mechanism 6 can bend and deform, allowing their other ends to rotate around the horizontal hinge axis 64, thereby enabling the tarpaulin arching mechanism 6 to unfold or fold. Furthermore, when the two adjacent support slides 93 of the tarpaulin arching mechanism 6 are at their maximum distance, i.e., when the tarpaulin between the two adjacent support slides 93 is straightened, the unfolding angle α of the tarpaulin arching mechanism 6 is less than 180°. This better ensures that the hinge point of the tarpaulin arching mechanism 6 arches upward when the support slides 93 approach each other. Compared to... Figure 5 The tarpaulin arching mechanism adopts a spring sheet structure, and the deformation of the first support 62 and the second support 63 of the tarpaulin arching mechanism is smaller and the service life is longer.

[0034] In some embodiments, the first support 62 and the second support 63 are also non-elastic elements. It is understood that in this case, the first support 62 and the second support 63 should be hinged to the corresponding support carriage 93.

[0035] like Figure 4 As shown, when the two adjacent support carriages 93 of the tarpaulin arching mechanism 6 are at their maximum distance, the hinged ends of the first support 62 and the second support 63 of the tarpaulin arching mechanism 6 abut against each other. Compared to the method where the hinged ends of the first support 62 and the second support 63 do not abut against each other when the two adjacent support carriages 93 of the tarpaulin arching mechanism 6 are at their maximum distance, the above method can better prevent the tarpaulin arching mechanism 6 from deforming downwards.

[0036] like Figure 6 As shown, the front end of the truck bed 1 is equipped with a tarpaulin slide rail front support frame 2, which is vertically slidably connected to it. The rear end of the truck bed 1 is equipped with a tarpaulin slide rail rear support frame 3, which is vertically slidably connected to it. The front end of the tarpaulin slide rail 4 is connected to the tarpaulin slide rail front support frame 2, and the rear end is connected to the tarpaulin slide rail rear support frame 3. The truck bed 1 is equipped with a lifting control mechanism that is connected to the tarpaulin slide rail front support frame 2 and the tarpaulin slide rail rear support frame 3 to control their synchronous lifting and lowering. In this way, the lifting control mechanism can control the synchronous lifting and lowering of the tarpaulin slide rail front support frame 2 and the tarpaulin slide rail rear support frame 3, thereby adjusting the height of the tarpaulin slide rail 4, and thus adjusting the height of the tarpaulin, so that the height of the tarpaulin matches the height of the truck loaded with cargo, for better coverage of the goods.

[0037] The tarpaulin slide rail 4 can be connected to the tarpaulin slide rail support frame by welding or detachable connection.

[0038] Figure 6In this structure, the lifting control mechanism includes a manual winch 7, which is connected to the front support frame 2 and the rear support frame 3 of the tarpaulin slide rail via pull ropes 8 fixed to it, so as to simultaneously raise the front support frame 2 and the rear support frame 3 of the tarpaulin slide rail. During descent, the drum is rotated in the opposite direction, which lengthens the pull rope 8, allowing the front support frame 2 and the rear support frame 3 of the tarpaulin slide rail to descend under the action of gravity.

[0039] In some embodiments, the lifting control mechanism also employs an electrically driven winch.

[0040] In some embodiments, the lifting control mechanism also includes a motor, which drives the front support frame 2 and the rear support frame 3 of the tarpaulin slide rail to lift synchronously via a gear and rack mechanism.

[0041] In some embodiments, the lifting control mechanism also employs a hydraulic cylinder or a pneumatic cylinder.

[0042] like Figure 3 As shown, it also includes a tarpaulin-retracting rope 10 with one end connected to the support rod 91 at the rear end of the tarpaulin 9, and a tarpaulin-covering rope 11 with one end connected to the support rod 91 at the rear end of the tarpaulin 9. The other end of the tarpaulin-covering rope 11 extends towards the rear end of the truck bed 1, and then extends downwards via a fixed pulley located at the rear end of the truck bed 1. The other end of the tarpaulin-retracting rope 10 extends towards the front end of the truck bed 1, and then extends backwards via a fixed pulley 12 located at the front end of the truck bed 1, and then extends downwards via a fixed pulley 12 located at the rear end of the truck bed 1. In this way, the tarpaulin can be retracted and covered by standing behind the truck bed.

[0043] This utility model also provides a truck tarpaulin for the above-mentioned installation structure. The tarpaulin 9 is provided with flexible elastic support rods 91 spaced apart along its length. A support slide 93 located below the tarpaulin 9 is provided in the middle of the support rods 91. The support slide 93 is used to slide with the tarpaulin slide rail 4. Between two adjacent support slides 93, there is a tarpaulin arching mechanism 6, which causes the tarpaulin above the two adjacent support slides 93 to arch upward and fold when the two adjacent support slides 93 are close together, thereby avoiding contact and friction between the tarpaulin 9 and the tarpaulin slide rail 4 below. The truck tarpaulin can be supported and slidably installed above the tarpaulin slide rail 4 by the support slide 93, so that when the tarpaulin is unfolded, its rear end passes over the tarpaulin slide rail rear support frame 3 and covers the rear side of the tarpaulin slide rail rear support frame 3. Moreover, when the tarpaulin is folded up, the large space behind the tarpaulin slide rail rear support frame 3 facilitates the deformation of the tarpaulin, and the tarpaulin is not easily caught by the tarpaulin slide rail rear support frame 3 when folded up, making the tarpaulin folding up easier and less strenuous. In addition, when the tarpaulin is retracted and the two adjacent support slides 93 are brought closer together, the tarpaulin arching mechanism 6 can cause the tarpaulin between the two adjacent support slides 93 to arch upward and fold, thereby avoiding contact and friction between the tarpaulin and the tarpaulin slide rail 4 below. The tarpaulin is easier to retract and unfold, and its service life can be better guaranteed.

Claims

1. A tarpaulin mounting structure for a truck, said tarpaulin (9) being provided with bendable elastic support rods (91) arranged at intervals along the length direction thereof, said mounting structure comprising a tarpaulin slide rail (4) mounted above the middle of the truck cabin (1), characterized in that: The middle part of the support rod (91) is provided with a support slide (93) that slides with the tarpaulin slide rail (4) and is located below the tarpaulin (9). The tarpaulin (9) is supported by the support slide (93) and slidably installed above the tarpaulin slide rail (4). Between two adjacent support slides (93), there is a tarpaulin arching mechanism (6) that causes the tarpaulin (9) above the two adjacent support slides (93) to arch upward and fold when the two adjacent support slides (93) are close together, thereby avoiding contact and friction between the tarpaulin (9) and the tarpaulin slide rail (4) below.

2. The truck tarpaulin installation structure as described in claim 1, characterized in that: The tarpaulin arching mechanism (6) includes a first support (62) and a second support (63), both of which are elastic elements; One end of the first support (62) is fixedly connected to one of the adjacent support slides (93), and one end of the second support (63) is fixedly connected to the other of the adjacent support slides (93). The other end of the first support (62) and the other end of the second support (63) are hinged by a horizontal hinge axis (64) perpendicular to the extension direction of the tarpaulin slide rail (4), so that the first support (62) and the second support (63) can rotate around the horizontal hinge axis (64) to fold the tarpaulin arch mechanism (6) when the two adjacent support slides (93) are close together, and can rotate around the horizontal hinge axis (64) to unfold the tarpaulin arch mechanism (6) when the two adjacent support slides (93) are far apart. When the two adjacent support slides (93) of the tarpaulin arch mechanism (6) are at their maximum distance, the unfolding angle of the tarpaulin arch mechanism (6) is less than 180°.

3. The truck tarpaulin installation structure as described in claim 2, characterized in that: When the two adjacent support carriages (93) of the tarpaulin arch mechanism (6) are at their maximum distance, the hinged ends of the first support (62) and the second support (63) of the tarpaulin arch mechanism (6) abut against each other.

4. The truck tarpaulin installation structure as described in claim 1, characterized in that: The front end of the truck body (1) is equipped with a tarpaulin slide rail front support frame (2) that is vertically slidably connected to it, and the rear end of the truck body (1) is equipped with a tarpaulin slide rail rear support frame (3) that is vertically slidably connected to it. The front end of the tarpaulin slide rail (4) is connected to the tarpaulin slide rail front support frame (2), and the rear end is connected to the tarpaulin slide rail rear support frame (3). The truck body (1) is equipped with a lifting control mechanism that is connected to the tarpaulin slide rail front support frame (2) and the tarpaulin slide rail rear support frame (3) to control their synchronous lifting.

5. The truck tarpaulin installation structure as described in claim 1, characterized in that: It also includes a tarpaulin rope (10) with one end connected to the support rod (91) at the rear end of the tarpaulin (9) and a covering rope (11) with one end connected to the support rod (91) at the rear end of the tarpaulin (9). The other end of the canopy rope (11) extends toward the rear end of the truck bed (1), and then extends downward through a fixed pulley located at the rear end of the truck bed (1). The other end of the canopy rope (10) extends toward the front end of the truck bed (1), then extends backward through a fixed pulley at the front end of the truck bed (1), and then extends downward through a fixed pulley at the rear end of the truck bed (1).

6. A truck tarpaulin, wherein the tarpaulin (9) is provided with flexible elastic support rods (91) spaced apart along its length, characterized in that: The middle part of the support rod (91) is provided with a support slide (93) located below the tarpaulin (9), and a tarpaulin arching mechanism (6) is provided between two adjacent support slides (93) to cause the tarpaulin above the two adjacent support slides (93) to arch upward and fold when the two adjacent support slides (93) are close together.

7. The truck tarpaulin as described in claim 6, characterized in that: The tarpaulin arching mechanism (6) includes a first support (62) and a second support (63), both of which are elastic elements; One end of the first support (62) is fixedly connected to one of the adjacent support slides (93), and one end of the second support (63) is fixedly connected to the other of the adjacent support slides (93). The other end of the first support (62) and the other end of the second support (63) are hinged by a horizontal hinge axis (64) so ​​that the first support (62) and the second support (63) can rotate around the horizontal hinge axis (64) to fold the tarpaulin arch mechanism (6) when the two adjacent support slides (93) are close together, and can rotate around the horizontal hinge axis (64) to unfold the tarpaulin arch mechanism (6) when the two adjacent support slides (93) are far apart. When the two adjacent support slides (93) of the tarpaulin arch mechanism (6) are at their maximum distance, the unfolding angle of the tarpaulin arch mechanism (6) is less than 180°.

8. The truck tarpaulin as described in claim 6, characterized in that: When the two adjacent support carriages (93) of the tarpaulin arch mechanism (6) are at their maximum distance, the hinged ends of the first support (62) and the second support (63) of the tarpaulin arch mechanism (6) abut against each other.

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