TWM500045U - Lifting/lowering releasing/securing mechanism for opening/closing covering of truck bed - Google Patents

Description

Lifting mechanism for opening and closing of truck body cover

This creation is applied to the technical field of truck equipment, especially a lifting and lowering mechanism for the truck body cover that can effectively and stably open and close the truck body cover.

In order to improve the safety of the truck and the positioning effect of the cargo, such as sand or cargo, it is necessary to cover the bucket with a layer of cover on the truck to avoid flying sand or cargo, but generally Most of the conventional truck body cover opening and closing is rotated by a 摆-shaped swing arm pivoted on the periphery of the truck, and is coupled with a lifting and lowering mechanism and a lifting mechanism to open or cover the cover. The lifting mechanism mainly pulls the arm by a spring and cooperates with the lifting and lowering mechanism to rotate and pull the arm. However, the lifting mechanism of the conventional truck body cover opening and closing is limited by the spring design of the lifting mechanism. The mask covers the body during the process of covering the body, that is, the arms on both sides of the swing arm exceed the vertical position, that is, the gravity of the swing arm is used to rotate the swing arm naturally toward the rear of the vehicle to complete the action of the mask.

The above-mentioned lifting mechanism is limited by the spring design, that is, if the length of the spring is insufficient and the tension is too long, the elastic fatigue is easily caused, and if the spring is too short, the problem of insufficient stretching distance and insufficient elastic pulling force is easily caused, so that it is convenient to cover. The cover is opened or shielded from the body of the vehicle. However, when the truck is subjected to strong wind blowing behind the vehicle during the masking operation, especially in the general working environment of the truck, it is usually a relatively empty area, such as a river bed or an open space. Strong, At this time, since the swing arm is in the rear section shielding process, when the arms on both sides of the swing arm are more than the vertical position, the tension springs are not pulled, and each turn is close to the original state, and there is no tension in the spring. Under the sway, the swing arm hangs down by its own gravity, and the wind receiving area of the mask is large, which easily causes the hood to generate a sail condition and cannot stably and continuously shield the hopper. At this time, the lifting and retracting mechanism continues to move, resulting in lifting and lowering. The plurality of steel cables of the receiving mechanism are continuously released, which makes it easy for a plurality of steel cables to be in a relaxed state, which not only makes the steel cable of the lifting and retracting mechanism reaming disorder, but also makes the swing arm unevenly distributed, causing problems such as tilting and jumping. The problem of the lifting and lowering mechanism loss and the mask cannot effectively and stably cover the body.

In view of the fact that the above-mentioned lifting mechanism of the conventional truck body bucket opening and closing is used in practice, there is still a problem that the mask cannot effectively and stably shield the vehicle body and the service life of the lifting and winding mechanism is not good, and then developed. This is a lifting and lowering mechanism for the opening and closing of the truck body.

The main purpose of the present invention is to provide a squatting mechanism for lifting and closing of a truck body cover, which can stably and effectively open or shield the hood under strong wind, and overcome the occurrence of the hood. The situation can also reduce the loss of the truck lifting and lowering mechanism.

In order to achieve the above-mentioned creative purposes, the technical means used in the present invention is to provide a lifting and lowering mechanism for the opening and closing of a truck body cover, which is applied to a truck, and the truck is provided with a body and a figure. The swing arm and the swing arm are respectively at least one arm on both sides, and a closed end is formed between the arms on both sides, and at least the ends of the two arm ends are respectively formed as a free end, and the two free ends are fixedly arranged under the vehicle body There is a pivot shaft, and the lifting and lowering mechanism is disposed at the two bottom sides of the symmetry of the vehicle body, and the lifting and lowering mechanism comprises a net lifting device and a cover pressing device. cover The net lifting device is disposed on a side of the pivot away from the front end of the vehicle, and comprises a first elastic element, one end of the first elastic element is coupled to the bottom side of the vehicle body, the other end is coupled to the arm rod, and the arm rod is connected to the net The lifting device is disposed at a first distance from the pivot, and the shutter pressing and closing device is disposed on the vehicle body, and includes a second elastic component and a swinging member, and one end of the second elastic component is coupled to the bottom of the vehicle On the side, the oscillating member is coupled to the second elastic member, and the oscillating member and the second elastic member are coupled to each other at a second distance with respect to the pivot center.

In order to achieve the above-mentioned creative purpose, the technical means additionally used in the present invention is to provide a lifting and lowering mechanism for the truck body cover opening and closing, which is applied to a truck, and the truck is provided with a body and a figure. The swing arm has at least one arm on each side, and a closed end is formed between the arms on both sides, and at least the ends of the two arms are respectively formed as a free end, and the two free ends are fixed between the lower sides of the body The utility model is provided with a pivot shaft, and the lifting and lowering mechanism is disposed at two bottom side positions of the symmetry of the vehicle body, and the lifting and lowering mechanism comprises a net lifting device and a cover pressing device. The cover lifting device is disposed on a side of the pivot away from the front end of the vehicle, and includes a first elastic element, one end of the first elastic element is coupled to the bottom side of the body, the other end is coupled to the arm, and the arm is connected to the cover The lifting device is disposed at a first distance from the pivot, and the shutter pressing and closing device is disposed on the vehicle body and includes a second elastic member, and one end of the second elastic member is coupled to the bottom side of the vehicle body, and One end is coupled to the free end of the pivot or the opposite arm, and the second elastic element and the pivotal joint position are formed with a second distance relative to the pivot center.

10‧‧‧ truck

11‧‧‧ head

12‧‧‧Cars

13, 130‧‧‧ mask

14‧‧‧ swing arm

140, 147, 148, 149‧‧‧ arm

141‧‧‧closed end

142‧‧‧Free end

143‧‧‧ linkages

144‧‧‧ linkage group

145‧‧‧Fixed parts

146‧‧‧First scroll

15, 150, 151, 152‧‧ ‧ pivot

20‧‧‧ Lifting and Retracting Agency

21, 210‧‧‧ Power source

22, 220‧‧‧ hinge group

23‧‧‧Steel cable

24‧‧‧ reel

30‧‧‧shading lifting device

31‧‧‧First mount

32‧‧‧ First fine-tuning

33, 330‧‧‧ first elastic element

340‧‧‧First flexible body connector

341‧‧‧ joint

342‧‧‧ Third flexible body connector

40, 400, 401, 402‧‧‧ Covering and lowering cover device

41‧‧‧Second mount

42‧‧‧Second fine-tuning

43,430‧‧‧Second elastic element

44, 440, 441‧‧‧Second flexible body connectors

45, 452‧‧‧ oscillating parts

450‧‧‧Fixed parts

451‧‧‧Extension

Fig. 1 is a perspective view of a truck applied to a steel cable reel type receiving and retracting mechanism.

Fig. 2 is a perspective view of a truck applied to another type of roll-type retracting mechanism.

Fig. 3 is a schematic view showing a first embodiment of the lifting and lowering mechanism of the present invention.

Fig. 4 is a schematic view showing the operation of the first embodiment of the present creation when the mask is to be retracted in Fig. 3.

Fig. 5 is a schematic view showing the operation of the first embodiment when the mask of Fig. 3 is to be shielded.

Figure 6: A schematic diagram of the action below Figure 5.

Fig. 7 is a schematic view showing a second embodiment of the present invention.

Fig. 8 is a schematic view showing a third embodiment of the present invention.

Fig. 9 is a schematic view showing a fourth embodiment of the present invention.

Fig. 10 is a schematic view showing a fifth embodiment of the present invention.

Figure 11 is a schematic view showing a sixth embodiment of the present invention.

As shown in FIG. 1, the first embodiment of the lifting and lowering mechanism for opening and closing the truck body cover is applied to a truck 10 having a front end 11, a body 12, and a cover. a cover 13 and a swing arm 14 , the bucket 12 is provided with a lifting and retracting mechanism 20 on one side of the front end 11 , and the lifting and retracting mechanism 20 includes a power source 21 , a set of hinges 22 , a plurality of cables 23 , and the like The swing arm 14 is formed with two long sides connected to one short side and shaped like a Chinese phonetic shape. The swing arm 14 is formed with an arm 140 on both sides, and the two ends of the two arms 140 are respectively formed with a closed end 141 and a The free end 142, the plurality of cables 23 and the cover 13 are fixed between the two closed ends 141, and the two free ends 142 are respectively pivoted on the bottom sides of the body 12 by a pivot shaft (not labeled). The power source 21 rotates the plurality of hinge plates of the hinge group 22 to rotate or release the cable 23, and the above structure is similar to the conventional truck equipment, and therefore will not be described again.

In addition, as shown in FIG. 2, it is another structure of a lifting and lowering mechanism, and its structure is substantially the same as that of the lifting and unwinding machine of FIG. 1 except that a power source 210 is sequentially driven. The reel set 220 and a reel 24 are rotated, and one end of the mating cover 130 is fixed to the reel 24, without the need to provide the cable 23 as shown in FIG. 1 and rotated by the drive reel 24 of the power source 210 for winding or The mask 130 is released, and the structure is similar to the conventional truck equipment, and will not be described again.

Please refer to FIG. 1 and FIG. 3, which are the first embodiment of the lifting and lowering mechanism of the truck body cover opening and closing of the present invention, and the lifting and lowering mechanism is respectively provided with two groups to be respectively disposed in On both sides of the body 12, the lifting and lowering mechanism respectively comprises a net lifting device 30 and a cover pressing device 40.

The shade lifting device 30 is disposed on a side of the pivot 15 away from the front end 11 and includes a first fixing seat 31, a first fine adjustment member 32, and a first elastic member 33.

The first fixing seat 31 is fixed to the body 12 and faces away from the side of the head 11 toward the pivot shaft 15.

The first fine adjustment member 32 can be telescopically adjusted to the first fixing base 31, and the first fine adjustment member 32 can be a first screw for the first screw to be screwed to the first fixing base 31.

One end of the first elastic member 33 is coupled to one end of the first fine adjustment member 32, and the first elastic member 33 may be a spring or other elastic body.

As shown in the figure, the arm member 140 is provided with a linking member 143, and the linking member 143 is a double connecting rod. One end of the linking member 143 is fixed to the arm member 140, and the linking member 143 is coupled to the first elastic member 33 at the other end. The rod 140 forms a first distance from the pivot 15 at the position of the connecting linkage 143. The first fixing seat 31, the first fine adjustment member 32 and the linking member 143 of the embodiment may be omitted, and one end of the first elastic member 33 is directly coupled to the bottom side of the body 12, and the other end is coupled to the arm 140. This part is only a change of the net lifting device 30 of the embodiment, but is not limited thereto.

The cover lower pressing and closing device 40 is disposed on the side of the pivot 15 toward the front end 11 and includes a second fixing seat 41, a second fine adjustment member 42, a second elastic member 43, and a second flexible body. The connector 44 and a swinging member 45.

The second fixing base 41 is fixed to the body 12 and faces one side of the front end 11 .

The second fine adjustment member 42 can be telescopically adjusted to the second fixing base 41, and the second fine adjustment member 42 can be a second screw for the second screw to be screwed to the second fixing base 41.

One end of the second elastic member 43 is coupled to one end of the second trimming member 42, and the second elastic member 43 may be a spring or other elastic body.

The second flexible body connector 44 can be a chain or a belt or a cable, and one end of the second flexible body connector 44 is coupled to the second elastic member 43 and away from the second fine adjustment member 42. One end. In this embodiment, the second fixing base 41, the second fine adjustment member 42 and the second flexible body connector 44 may be omitted, and one end of the second elastic member 43 is coupled to the bottom side of the body 12, and the swinging member 45 is The second elastic member 43 is coupled to the second elastic member 43, and the swinging member 45 and the second elastic member 43 are coupled away from the arm 140, and a second distance is formed with respect to the center of the pivot 15. This portion is only under the cover of the embodiment. The change of the capping device 40 is not limited thereto.

The oscillating member 45 of the embodiment is a rolling member, and the oscillating member 45 is fixed to the free end of the arm 140 and adjacent to the pivot 15. The oscillating member 45 is a semi-circular sprocket as shown in the figure. It is not limited to a semi-circular toothed disc. In other embodiments, it may be a circular toothed disc or other geometric toothed disc. The swinging member 45 is fixed to the second flexible body connector 44 at one of the peripheral edges, and the swinging member 45 is The pivot 15 is fixed to the free end of the arm 140, so that when the arm 140 of the swing arm 14 rotates, the swinging member 45 can be synchronously rotated about the pivot 15. Technically, when the oscillating member is a sprocket, the second flexible body connector is preferably a chain, and when the oscillating member is provided as a sheave, the second flexible body connector is preferably a belt or a cable. Additionally, in other embodiments, the second flexible body connector 44 can be omitted to secure the swing member 45 to the second resilient member 43 at one of the peripheral edges. or, The second flexible connector 44 and the swinging member 45 may be omitted, so that the second elastic member 43 is coupled to the pivot end 15 or the free end 142 of the opposite arm 14 away from the one end of the bottom side of the vehicle body, and the second elastic member 43 A coupling position with the pivot 15 forms a second distance with respect to the center of the pivot 15.

When the mask 13 is taken up, as shown in FIGS. 1 and 4, the initial state is that the mask 13 has completely covered the body 12, and the power source 21 of the lifting and lowering mechanism 20 starts the hinge. The disk group 22 is rotated to synchronously retract the plurality of cables 23, and between the two closed ends 141 of the swing arm 14, the interlocking arm 140 rotates in the direction of the hinge group 22 about the pivot 15 and rotates on the swing arm 14. At the same time, the net lifting device 30 is connected in sequence, that is, the first elastic member 33 is stretched via the linking member 143, and when the arm 140 continues to rotate, the cover lower pressing device 40 is also driven. The swinging member 45 rotates to pull the second flexible body connector 44 in a direction different from the second elastic member 43 to elastically stretch the second elastic member 43 to shorten the second elastic member 43 and the pivot 15 The distance between the first elastic member 33 and the second elastic member 43 is in a stretched state. In addition, the first elastic member 33 and the second elastic member 43 of the present embodiment are in a stretched state. The first fine adjustment member 32 and the second fine adjustment member 42 can be respectively rotated according to the required elastic force to make the first fine adjustment 32 and the second trim member 42 can be respectively disposed in the horizontal direction, so as to adjust the elastic force of the first elastic member 33 and the second elastic member 43.

When the mask 13 needs to be shielded from the body 12, please refer to FIG. 1 and FIG. 5. At this time, the hinge group 22 gradually rotates and pulls out the plurality of cables 23, and receives the net lifting device 30. The tension arm of the first elastic member 33 affects the swing arm 14 on the one hand by the tensile force of the plurality of cables 23, and on the other hand by the tensile elastic force of the first elastic member 33, causing the swing arm 14 to rotate toward the rear of the truck 10. Referring to FIG. 6 again, when the first elastic member 33 is returned to the original unstretched state, the shutter lifting device 30 has no force for pressing the swing arm 14 at this time, and the second elastic member is at this time. 43 is capable of moving the second flexible body connector 44 toward the second elastic member 43 by pulling the swinging member 45 to rotate by the elastic force of the tension by stretching, so that the second elastic member 43 is subjected to the pulling force of the plurality of cables 23 And the gravity of the swing arm 14 is slowly returned to the unstretched state, and the swing arm 14 is stably rotated while providing the shielding effect of the shield 13 to shield the body 12.

At this time, if the strong air is blown from the rear of the vehicle body 12 during the process of covering the body 12, the present embodiment can not only rely on the gravity of the swing arm 14 itself, but also includes the second elastic member 43. The elastic pulling force can shield the cover 13 to the body 12 stably and safely.

As shown in FIG. 7, it is a second embodiment of the present invention, wherein the difference from the first embodiment is that the linkage 143 of the first embodiment is changed to a linkage group 144, and the linkage group 144 includes a fixing member 145 and a first rolling member 146, the fixing member 145 is fixed to the arm 140, and the first rolling member 146 is fixed to the fixing member 145, and the first rolling member 146 is half round as shown in the figure. The toothed disc is not limited to a semi-circular toothed disc. In other embodiments, it may be a circular toothed disc or other geometric toothed disc, and the first scrolling member 146 is at a portion of the circumference and the first flexible body. The connector 340 is fixed for the first flexible body connector 340 to be retracted or unfolded on the first scroll member 146, and can also have the effect of the first embodiment of the present invention, the first flexibility of the above embodiment The body connector 340 and the first roller 146 are merely illustrative. The present invention is not limited thereto, and only the same linkage effect as the embodiment is generated, which is within the protection scope of the present invention.

Please refer to FIG. 8 , which is a third embodiment of the present invention, wherein most of the drawings are identical to the second embodiment. The difference is that the swinging member of the cover lower pressing and closing device 400 is fixed. The member 450 is formed with an angle between the fixing member 450 and the arm 147, and one end of the fixing member 450 is fixed to the free end of the pivot 150 or the arm 147, and the other end of the fixing member 450 and the second flexible body connector 440 link. In addition, in other embodiments, the second flexible body connector may be omitted to The other end of the fixing member is fixed to the second elastic member.

Please refer to FIG. 9 , which is a fourth embodiment of the present invention, wherein most of the drawings are identical to the third embodiment, with the difference that the swinging member of the cover lower pressing and closing device 401 is more arm. The free end of the rod 148 extends from an extension 451, and the extension 451 is coupled to the second flexible body connector 441 at one end of the pivot 151. Additionally, in other embodiments, the second flexible body connector may be omitted to couple the extension away from the pivot end to the second resilient member.

Please refer to FIG. 10, which is a fifth embodiment of the present invention, wherein most of the drawings are identical to the first embodiment, with the difference that the linkage of the net lifting device 300 of the first embodiment is different. 143 is changed to a coupling seat 341 of the fifth embodiment, the coupling seat 341 is fixed to the arm 149, and is coupled to one end of the first elastic member 330, and the other end of the first elastic member 330 is coupled to a third flexibility. The body connector 342 and the third flexible body connector 342 are coupled to the body 12 away from one end of the first elastic member 330.

As shown in Fig. 11, it is a sixth embodiment of the present invention, wherein the difference between the first embodiment and the first embodiment is that the screen lifting device 301 and the shutter pressing and closing device 402 are each provided with a relative pivot. 152 is away from one side of the direction of the 11 head, and the shade lifting device 301 is located above the cover lower pressing device 402, and the swinging member 452 is a rolling member, and is set according to the direction of the lower pressing device 402. The arrangement is opposite to the direction of the first embodiment, that is, the semicircular outer contour of the oscillating member 452 is disposed toward the second elastic member 430, and the above structure can also produce a stable retraction or closure as in the first embodiment of the present invention. The effect of the mask also has the effect of positioning the mask to prevent the truck from accidentally bounced by the cover 13 (as shown in Fig. 1) caused by the traveling vibration or crosswind, causing the contents of the body 12 to fall. And other issues.

The embodiments of the above-described lifting raft mechanism of the present invention are not limited to single poles. The swing arm can be applied according to the swing arm design of different trucks, and the elastic tension design of the net lifting device and the cover pressing device of the present invention can also be applied to the torsion spring. As a source of elasticity, this part is not limited. Furthermore, the first flexible body connector or the second flexible body connector of the embodiments of the present invention is not limited to the use of a chain, and when the flexible body connector is a chain, the rolling member is selected as a toothed disk. When the flexible body connector is a belt or a steel cable, it is preferable to use a rope wheel having a ring groove; in detail, the flexible body connector can adopt a belt or a steel cable, and when a belt or a steel cable is used, In the case of a flexible body connector, the swinging member (including the rolling member) is preferably a sheave, and the sheave can be fixed to the pivot or the swing arm, so that one end of the belt or the cable is fixed to the sheave. The other end is connected to the second elastic element, and the swinging member and the second elastic element are coupled away from the arm, forming a second distance with respect to the pivot center, and the swinging member can be driven when the second elastic member generates the elastic force. The arm generates a rotary lower pressing action (this part is only described in the text as a technical description and is not illustrated by the legend).

The present invention has been described in terms of the above embodiments and variations, and all the embodiments and variations of the present invention are merely illustrative and limiting, based on the spirit and scope of the present invention, and the truck body cover including the above features. The various changes in the lifting and closing mechanism of the opening and closing are covered by this creation.

140‧‧‧Boom

143‧‧‧ linkages

15‧‧‧ pivot

30‧‧‧Net lifting device

31‧‧‧First mount

32‧‧‧ First fine-tuning

33‧‧‧First elastic element

40‧‧‧ Covering and pressing device

41‧‧‧Second mount

42‧‧‧Second fine-tuning

43‧‧‧Second elastic element

44‧‧‧Second flexible body connector

45‧‧‧Swinging parts

Claims (29)

A lifting and lowering mechanism for a truck body cover opening and closing, which is applied to a truck, and the truck is provided with a body and a U-shaped swing arm, the swing arm is at least one arm on each side, and A closed end is formed between the two arms, and at least two ends of the side arm are respectively formed as a free end, and the free ends are fixedly disposed with a pivot between the lower sides of the body, and the lifting mechanism is disposed on the The two sides of the body are symmetrical, and each of the lifting and lowering mechanisms includes: a net lifting device disposed on a side of the pivot away from the front of the vehicle head, and comprising: a first elasticity An end of the first elastic member is coupled to the bottom side of the vehicle body, and the other end is coupled to the arm, and the arm is formed with a first distance between the position of the lifting device and the pivoting device; a cover lower pressing and closing device, wherein the cover lower pressing and closing device is disposed in the vehicle body, and includes: a second elastic member, one end of the second elastic member is coupled to the bottom side of the body; a swinging member, The swinging member is coupled to the second elastic member, the swinging member and the second member Coupling element with respect to the position of the pivot is formed with a second center distance. The lift mechanism of the truck body cover as shown in claim 1 , wherein the net lift device further comprises a first fixing seat and a first fine adjustment member, wherein the first fixing seat is fixed on the And the first fine adjustment member is telescopically adjustable to the first fixed seat, and the one end of the first fine adjustment member and the first elastic member are away from the pivot Connected at one end. The lift mechanism of the truck body cover opening and closing according to claim 1, wherein the first elastic element is a spring. The lifting mechanism of the truck body cover opening and closing according to claim 2, wherein the net lifting device further comprises a first flexible body connector, and one end of the first flexible body connector is coupled to The first elastic element is away from one end of the first fine adjustment member, and the other end of the first flexible body connector is coupled to the arm. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 4, wherein the first flexible body connector is a chain, a belt or a steel cable. The lifting mechanism of the truck body cover opening and closing according to claim 1, wherein the arm rod protrudes from the linkage member, and one end of the linkage member is fixed to the arm rod, and the linkage member is coupled to the first end at the other end. And an elastic member, and the arm is formed with the first distance between the position of the connecting rod and the pivot. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 6, wherein the linking member is a double connecting rod. The lifting mechanism of the truck body cover opening and closing according to claim 4, wherein the arm rod is fixedly provided with a linkage group, the linkage group comprises a fixing member and a first rolling member, and the fixing member is fixed to The arm is fixed to the fixing member, and the first rolling member is fixed to the first flexible body connector at a portion of the circumference. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 8, wherein the first rolling member is a semicircular toothed disk, a circular toothed disk or other geometric toothed disk. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 2, wherein the first fine adjustment member is a screw. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 1, wherein the arm is provided with a coupling seat, and the coupling seat is coupled with the first elastic member. A lifting mechanism for opening and closing a truck body cover as claimed in claim 1 or 11, wherein A third flexible body connector is coupled to one end of the first elastic member, and the third flexible body connector is coupled to the bottom side of the vehicle body away from one end of the first elastic member. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 1, wherein the shutter pressing and closing device is disposed on a side of the pivot away from the shade lifting device. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 1, wherein the cover lower pressing and closing device further comprises a second fixing seat and a second fine adjusting piece, and the second fixing seat is fixed The second fine adjustment member is telescopically adjustable to the second fixing seat, and one end of the second fine adjustment member is coupled to the second elastic member. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 14, wherein the second fine adjustment member is a second screw, and the second screw is screwed to the second fixing base. The lift mechanism of the truck body cover opening and closing according to claim 14, wherein the cover lower pressing device further comprises a second flexible body connector, one end of the second flexible body connector Attached to the second elastic element and away from one end of the second fine adjustment member, the other end of the second flexible body connector is coupled to the swinging member. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 16, wherein the second flexible body connector is a chain, a belt or a steel cable. The lifting mechanism of the truck body cover opening and closing according to claim 16, wherein the swinging member is a rolling member, and the rolling member is fixed to the free end of the arm and adjacent to the pivot And the scroll member is fixed to the second flexible body connector at a portion of the circumference. The lifting mechanism of the truck body cover opening and closing according to claim 1, wherein the swinging member is a rolling member, and the rolling member is fixed to the free end of the arm and adjacent to the pivot And the scroll member is fixed to the second elastic member at a portion of the circumference. A lifting mechanism for opening and closing a truck body cover according to claim 18 or 19, wherein the rolling member is a semicircular chainring, a circular chainring or other geometric toothed disc. The lifting mechanism of the truck body cover opening and closing according to claim 16, wherein the swinging member is a fixing member, and the fixing member forms an angle with the arm, and one end of the fixing member is fixed to The pivot or the free end of the arm, the other end of the fixing member is coupled to the second flexible body connector. The lifting mechanism of the truck body cover opening and closing according to claim 1, wherein the swinging member is a fixing member, and the fixing member forms an angle with the arm, and one end of the fixing member is fixed to The pivot or the free end of the arm, the other end of the fixing member is coupled to the second elastic member. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 16, wherein the swinging member is an extension extending from a free end of the arm, and the extending portion is away from one end of the pivot shaft. The second flexible body connector is coupled. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 1, wherein the swinging member is an extension extending from a free end of the arm, and the extending portion is away from one end of the pivot shaft The second elastic elements are coupled. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 1, wherein the cover lower pressing device and the net lifting device are disposed on the same side of the pivot. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 25, wherein the net lifting device is located above the lower gland holding device. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 25, wherein the swinging member is a rolling member. The lifting and lowering mechanism of the truck body cover opening and closing according to claim 27, wherein the rolling member is semicircular, and the semicircular outer contour of the rolling member is disposed toward the second elastic member. . A lifting and lowering mechanism for a truck body cover opening and closing, which is applied to a truck. The truck is provided with a body and a squat arm, the swing arm is at least one arm on each side, and a closed end is formed between the two arms, and at least two ends of the side arm are respectively formed. a free end, the two free ends are fixedly disposed with a pivot between the lower sides of the body, the lifting mechanism is disposed at two bottom sides of the symmetry of the body, and each of the lifting mechanism comprises: a cover a lifting device, the net lifting device is disposed on a side of the pivot away from the front of the vehicle head, and includes: a first elastic element, one end of the first elastic element is coupled to the bottom side of the body, and the other end is coupled to The arm, and the arm is formed with a first distance between the position of the lifting device and the pivoting device; a cover pressing device, the cover pressing device is disposed in the body And comprising: a second elastic element, one end of the second elastic element is coupled to the bottom side of the body, the other end is coupled to the free end of the pivot or the opposite arm, and the second elastic element and the pivot The joint position forms a second distance relative to the center of the pivot.