Awning cover lifting transmission device

Abstract

The utility model relates to a canopy lifting transmission device, which belongs to the technical field of compartment covering devices of stake cars, and comprises a front lifting group, a rear lifting group, two transmission groups and a connecting group, the two transmission groups are respectively arranged at the top of the front lifting group and the top of the rear lifting group in a mirror symmetry manner, and the two transmission groups are linked through the connecting group. According to the tent cover lifting transmission device, the transmission device is moved to the top of a carriage and is parallel to a carriage tent cover opening and closing track, linkage lifting of tent cloth on the four stand columns of the carriage is achieved at the same time, transformation work of installation equipment at the bottom of the carriage is avoided, the installation technical requirement is lowered, and the installation time is saved; due to pure mechanical linkage, the cost is reduced, and the maintenance is convenient; through rotary connection of the transmission shaft, the situation that the compartment deforms and the fence door cannot be opened due to pulling of equipment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of a compartment cover device for a shed truck, in particular to a canopy lifting transmission device. Background Art

[0002] During the transportation of the cargo box truck, the cargo needs to be covered with a tarpaulin on the top of the truck box to prevent the cargo from falling during transportation and to protect the cargo from wind and rain and loss. In this process, a tarpaulin lifting transmission device is required. The lifting and rotating devices currently available on the market mainly include electric lifting, hydraulic lifting and mechanical lifting, among which mechanical lifting is more common.

[0003] The utility model patent with patent number 202322248961.1 discloses a manual lifting mechanism for a high-rail truck tarpaulin. A force-applying device for applying and transmitting rotational power is installed at the bottom of the frame. Two supporting devices are symmetrically installed in the frame device. The rotation and lifting of the high-rail truck tarpaulin are completed through the cooperation of the force-applying device and the supporting device. However, this scheme is a transmission at the bottom of the car box. Due to the complex environment at the bottom of the car box, the installation cost is high and it is not easy to maintain. In addition, this scheme cannot achieve the linkage and synchronous lifting of the tarpaulin on the four columns of the car box. Utility Model Content

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a awning lifting transmission device, which transfers the bottom transmission from the bottom of the vehicle box to the top of the vehicle box, and realizes the linkage lifting of the awning on the four pillars of the vehicle box.

[0005] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a canopy lifting transmission device, which includes a front lifting group, a rear lifting group, a transmission group and a connecting group. The transmission group is provided with two groups, and the two transmission groups are respectively arranged on the top of the front lifting group and the rear lifting group, and the two transmission groups are linked through the connecting group.

[0006] Furthermore, the transmission group includes a first transmission shaft, a second transmission shaft, a top sprocket, a first umbrella wheel and a second umbrella wheel meshing with the first umbrella wheel, the top sprocket is coaxially connected to the first umbrella wheel through the first transmission shaft, and the second umbrella wheel is coaxially connected to the second transmission shaft.

[0007] Furthermore, the front lifting group includes a first outer sleeve, a first lifting tube, a bottom sprocket and a chain, the first lifting tube is inserted into the first outer sleeve, the bottom sprocket moves synchronously with the first lifting tube, one end of the chain is fixed to the top of one side of the first outer sleeve, the other end of the chain is fixed to the top of the other side of the first outer sleeve, the chain is hung downward on the bottom sprocket, and is hung upward on the top sprocket.

[0008] Furthermore, the rear lifting group includes a second outer sleeve, a second lifting tube, a linkage sprocket, an annular chain, a gear and a rack meshing with the gear; the second lifting tube is inserted into the second outer sleeve, the linkage sprocket and the gear are coaxially connected, the linkage sprocket and the gear are arranged at the bottom of the second lifting tube and are rotatably connected to the second lifting tube, the rack is arranged on the inner wall of the second outer sleeve, one end of the annular chain is hung on the top sprocket, and the other end of the annular chain is hung on the linkage sprocket.

[0009] Furthermore, the front lifting group also includes a right-angle steering gear and a screw rod, the right-angle steering gear is connected to the screw rod, the first lifting tube is fixed to the top of the thread sleeve of the screw rod, and the bottom sprocket is connected to the thread sleeve through a fixing plate.

[0010] Furthermore, the front lifting group also includes a base, which is fixedly connected to the bottom of the first outer sleeve, and a screw limit platform is provided on the screw near the right-angle steering gear. The screw limit platform is clamped in the base, and a locking block is provided on the top of the screw.

[0011] Furthermore, the transmission group further comprises an L-shaped bracket and a U-shaped bracket, the L-shaped bracket and the U-shaped bracket are fixedly connected, the two L-shaped brackets are respectively fixedly arranged on the top of the first lifting tube and the top of the second lifting tube, the first transmission shaft is rotatably connected to the L-shaped bracket and the U-shaped bracket, and the second transmission shaft is rotatably connected to the bearing fixing plate arranged in the U-shaped bracket. A slide rail is arranged between the two U-shaped brackets at the top of the front lifting group and the rear lifting group.

[0012] Furthermore, the connection group includes a transmission slide tube and a linkage slider, the transmission slide tube is fixedly connected to one group of the second transmission shafts, the linkage slider is fixedly connected to another group of the second transmission shafts, and the transmission slide tube is slidably connected to the linkage slider and rotates synchronously.

[0013] Furthermore, the right-angle steering gear includes a first output shaft, a second output shaft and an umbrella wheel assembly. The first output shaft is linked to the second output shaft through the umbrella wheel assembly. The first output shaft is fixedly connected to the screw rod. One end of the second output shaft is externally connected to a driving device. The two groups of right-angle steering gears are linked through the second output shaft.

[0014] Furthermore, the umbrella wheel assembly includes a third umbrella wheel, a fourth umbrella wheel meshing with the third umbrella wheel, a fifth umbrella wheel, a sixth umbrella wheel meshing with the fifth umbrella wheel and a third transmission shaft, the third umbrella wheel is coaxially fixedly connected to the first output shaft, the sixth umbrella wheel is coaxially fixedly connected to the second output shaft, and the fourth umbrella wheel and the fifth umbrella wheel rotate synchronously through the third transmission shaft.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects:

[0016] The bottom transmission in the prior art is transferred to the top of the carriage, parallel to the opening and closing track of the carriage awning, and the tarpaulins on the four pillars of the carriage are lifted and lowered in a linked manner, avoiding the modification work of installing the equipment at the bottom of the carriage, reducing the technical requirements for installation, saving installation time, and being easy to use; the purely mechanical linkage reduces costs and facilitates maintenance; the rotation connection through the transmission shaft avoids the deformation of the carriage caused by the pulling of the equipment and the inability to open the gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the linkage structure of the front lifting group and the rear lifting group;

[0018] Figure 2 It is the main view of the transmission group structure;

[0019] Figure 3 It is a side view of the transmission group structure;

[0020] Figure 4 It is a schematic diagram of the front lifting group structure;

[0021] Figure 5 It is a schematic diagram of the rear lifting group structure;

[0022] Figure 6 This is a bottom view of the rear lifting group;

[0023] Figure 7 It is a schematic diagram of the linkage structure of two sets of right-angle steering gears;

[0024] Figure 8 It is a schematic diagram of the structure of a right-angle steering machine;

[0025] Fig. 9 It is a schematic diagram of the structure of the umbrella wheel assembly.

[0026] In the figure, 100, front lifting group; 110, first outer sleeve; 120, first lifting tube; 130, bottom sprocket; 140, chain; 150, right angle steering gear; 151, first output shaft; 152, second output shaft; 153, umbrella wheel assembly; 154, third umbrella wheel; 155, fourth umbrella wheel; 156, third transmission shaft; 157, fifth umbrella wheel; 158, sixth umbrella wheel; 159, connecting sleeve; 160, screw rod; 161, wire sleeve; 162, screw rod limiter; 163, locking block; 1 70. Base; 200. Rear lifting group; 210. Second outer sleeve; 220. Second lifting tube; 230. Linkage sprocket; 240. Ring chain; 250. Gear; 260. Rack; 300. Transmission group; 310. First transmission shaft; 320. Second transmission shaft; 330. Top sprocket; 340. First umbrella wheel; 350. Second umbrella wheel; 360. L-shaped bracket; 370. U-shaped bracket; 371. Slide; 400. Connection group; 410. Transmission slide tube; 420. Linkage slider; 500. Slide rail. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 To Attachment Fig. 9 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0028] like Figure 1 As shown, a canopy lifting transmission device includes a front lifting group 100, a rear lifting group 200, a transmission group 300 and a connection group 400. The two groups of front lifting groups 100 are detachably mounted on the front pillars on both sides of the vehicle box in a mirror-symmetrical manner. Similarly, the two groups of rear lifting groups 200 are detachably mounted on the rear pillars on both sides of the vehicle box in a mirror-symmetrical manner. The tops of the front lifting group 100 and the rear lifting group 200 on the same side of the vehicle box are respectively provided with transmission groups 300. The two transmission groups 300 are connected by a connection group 400 to achieve linkage, thereby achieving synchronous lifting of the front lifting group 100 and the rear lifting group 200. The two groups of front lifting groups 100 located on the two front pillars of the vehicle box are connected to each other, and can also achieve synchronous lifting, thereby achieving synchronous lifting of the tarpaulin on the four pillars of the vehicle box.

[0029] like Figure 2As shown, the front lifting group 100 includes a first outer sleeve 110, a first lifting tube 120, a bottom sprocket 130, a chain 140, a right angle steering machine 150, a screw rod 160 and a base 170. The first outer sleeve 110 and the right angle steering machine 150 are detachably fixed on the front column of the vehicle box. The first lifting tube 120 is inserted into the first outer sleeve 110, one end of the chain 140 is fixed to the top of one side of the first outer sleeve 110, and then hung downward on the bottom sprocket 130, and then hung upward on the top sprocket 330 of the transmission group 300, and the other end of the chain 140 is fixed to the top of the other end of the first outer sleeve 110. The right angle steering machine 150 is fixedly connected to the screw rod 160. In some embodiments, the right angle steering machine 150 and the screw rod 160 can be connected by a universal joint for installation. The screw rod 160 includes a threaded sleeve 161, a threaded sleeve limiting platform 162 and a locking block 163. The threaded sleeve limiting platform 162 is arranged on the screw rod 160 near the position of the right-angle steering machine 150, and the locking block 163 is arranged on the top of the screw rod 160 for limiting the threaded sleeve 161. The first lifting tube 120 is fixed on the top of the threaded sleeve 161, and a fixing plate is arranged on one side of the threaded sleeve 161 for installing the bottom sprocket 130, so that the bottom sprocket 130 is rotatably connected with the threaded sleeve 161. When the threaded sleeve 161 rises or falls, the bottom sprocket 130 and the first lifting tube 120 move synchronously with the threaded sleeve 161. The base 170 is fixedly connected to the bottom of the first outer sleeve 110, and the threaded sleeve limiting platform 162 is clamped in the base 170 by a bearing and a pressure bearing.

[0030] In some embodiments, one side of the first outer sleeve 110 is provided with an opening along its radial direction, and the bottom sprocket 130 protrudes from the opening of the first outer sleeve 110. In order to protect the bottom sprocket 130, it can also be arranged inside the first outer sleeve 110.

[0031] like Figures 7 to 9As shown, the right-angle steering machine 150 includes a first output shaft 151, a second output shaft 152 and an umbrella wheel assembly 153, and the first output shaft 151 is linked with the second output shaft 152 through the umbrella wheel assembly 153. A group of front lifting groups 100 are installed on each of the two front pillars of the car body, and the first output shafts 151 of the two right-angle steering machines 150 are respectively fixedly connected with the screw rods 160 in the two groups of front lifting groups 100. In some embodiments, at least one universal joint is arranged on the first output shaft 151 or between the first output shaft 151 and the screw rod 160, which plays a role in facilitating installation, disassembly and maintenance, and also plays a role in preventing shaft deflection. The two right-angle steering machines 150 are connected through the second output shaft 152 to achieve linkage. The second output shaft 152 runs through the right-angle steering machine 150, and the other end of the second output shaft 152 is externally connected to a common driving mechanism such as a crank or an electric motor. In some embodiments, a connecting sleeve 159 is provided on the other end of the second output shaft 152 for inserting a crank to realize manual shaking drive through the crank.

[0032] In some embodiments, for the convenience of installation, disassembly and maintenance, the second output shaft 152 includes an outer sleeve shaft and an inner sleeve shaft, which are detachably connected and can rotate synchronously, and the outer sleeve shaft is sleeved on the outside of one end of the inner sleeve shaft or the outer sleeve shaft is sleeved on the outside of both ends of the inner sleeve shaft. In some embodiments, a universal joint can also be provided on the outer sleeve shaft to prevent the second output shaft 152 from deflecting.

[0033] The umbrella wheel assembly 153 includes a third umbrella wheel 154, a fourth umbrella wheel 155 meshed with the third umbrella wheel 154, a fifth umbrella wheel 157, a sixth umbrella wheel 158 meshed with the fifth umbrella wheel 157, and a third transmission shaft 156. The third umbrella wheel 154 is coaxially fixedly connected to the first output shaft 151, the sixth umbrella wheel 158 is coaxially fixedly connected to the second output shaft 152, and the fourth umbrella wheel 155 and the fifth umbrella wheel 157 rotate synchronously through the third transmission shaft 156.

[0034] When the driving mechanism drives the second output shaft 152 of the right-angle steering machine 150 on one of the front columns of the vehicle box to rotate, the second output shaft 152 of the right-angle steering machine 150 on the other front column rotates synchronously. The rotation of the second output shaft 152 drives the sixth umbrella wheel 158 and the fifth umbrella wheel 157 meshing therewith to rotate, and the rotation of the fifth umbrella wheel 157 drives the fourth umbrella wheel 155 coaxial therewith and the third umbrella wheel 154 meshing with the fourth umbrella wheel 155 to rotate, and then drives the first output shaft 151 and the screw rod 160 fixedly connected thereto to rotate, so as to realize the synchronous lifting of the two front lifting groups 100 on the two front columns of the vehicle box.

[0035] like Figure 5 and Figure 6As shown, the rear lifting group 200 includes a second outer sleeve 210, a second lifting tube 220, a linkage sprocket 230, an annular chain 240, a gear 250 and a rack 260 meshed therewith. The second lifting tube 220 is inserted into the second outer sleeve 210, and the bottom of the second lifting tube 220 is rotatably connected with the linkage sprocket 230 and the gear 250 through a rotating shaft. The linkage sprocket 230 and the gear 250 are coaxially connected, and the rack 260 is arranged on the inner wall of the second outer sleeve 210. The annular chain 240 is an annular closed chain. In order to facilitate the adjustment of the annular chain, a tensioning device can be arranged on the annular chain 240. The tensioning device is a well-known technology in the art and is not described here. One end of the annular chain 240 is engaged with the top sprocket 330 of the transmission group 300, and the other end is engaged with the linkage sprocket 230.

[0036] like Figure 2 and Figure 3 As shown, the transmission group 300 includes a first transmission shaft 310, a second transmission shaft 320, a top sprocket 330, a first umbrella wheel 340, a second umbrella wheel 350 meshing with the first umbrella wheel 340, an L-shaped bracket 360 and a U-shaped bracket 370. Among them, the top sprocket 330 is coaxially connected with the first umbrella wheel 340 through the first transmission shaft 310, and the second umbrella wheel 350 is coaxially connected with the second transmission shaft 320. The L-shaped bracket 360 and the U-shaped bracket 370 are fixedly connected, and the two L-shaped brackets 360 are respectively fixedly arranged on the top of the first lifting tube 120 and the top of the second lifting tube 220. The first transmission shaft 310 is rotatably connected with the L-shaped bracket 360 and the U-shaped bracket 370, and the second transmission shaft 320 is rotatably connected with the bearing fixing plate arranged in the U-shaped bracket 370. A slide rail 500 is arranged between the two U-shaped brackets 370 at the top of the front lifting group 100 and the rear lifting group 200.

[0037] In some embodiments, the U-shaped bracket 370 located at the top of the front lifting group 100 is fixedly connected to the slide rail 500, and the U-shaped bracket 370 located at the top of the rear lifting group 200 is provided with a slide groove 371. The U-shaped bracket 370 located at the top of the rear lifting group 200 is connected to the slide rail 500 by bolts through the slide groove 371. When the car body pillar tilts inward, the bolt slides in the slide groove 371, which can release the deformation of the car body and cause the slide rail to be squeezed. There are multiple pulleys that can slide back and forth on the slide rail 500, and the tops of the pulleys on both sides are fixed with awning rods in turn. The awning rods can be covered with tarpaulins, and the pulleys can slide back and forth to pull the tarpaulins to open and close. This solution is highly adaptable to the slide rail 500. The slide rail 500 can select various common styles, such as round steel track type, closed track type, etc., and the pulley can also select a variety of styles that are suitable in the prior art.

[0038] In some embodiments, the top sprocket 330 and the linkage sprocket 230 have the same specifications to ensure transmission consistency.

[0039] In some embodiments, after the linkage sprocket 230 is engaged with the ring chain 240 and the gear 250 is engaged with the rack 260, the circumference of one rotation of the linkage sprocket 230 and the gear 250 is the same, so that the lifting distances of the front and rear lifting groups are the same.

[0040] like Figure 1 As shown, the connection group 400 includes a transmission slide 410 and a linkage slider 420. The transmission slide 410 is fixedly connected to the second transmission shaft 320 in one transmission group 300, and the linkage slider 420 is fixedly connected to the second transmission shaft 320 in another transmission group 300. The transmission slide 410 and the linkage slider 420 are slidably connected and rotate synchronously. When the vehicle box is loaded with heavy goods, the tops of the four pillars of the vehicle tilt inward, resulting in inward displacement. Through the sliding connection between the transmission slide 410 and the linkage slider 420, the movable margin of the vehicle box pillar can be released to avoid damage to the connection group 400. In some embodiments, a transmission pipe can be added between the second transmission shaft 320 and the transmission slide 410. The strength of the transmission pipe is higher than that of the second transmission shaft 320 to further ensure the stability of the connection group 400. In some embodiments, the transmission slide 410 and the linkage slider 420 are square tubes and blocks to achieve synchronous rotation of the two. A universal joint may also be provided on the second transmission shaft 320 or an additional transmission tube to release the torsion caused by the different displacements of the front and rear pillars of the vehicle box.

[0041] Since the front lifting group 100 and the rear lifting group 200 on the front and rear pillars of the vehicle box are symmetrical, the working process is now described by taking one side as an example. When the canopy is to be raised: the right-angle steering machine 150 is driven to rotate the first output shaft 151, drive the screw rod 160 to rotate, the wire sleeve 161 and the first lifting tube 120 to rise, and then drive the transmission group 300 on the front lifting group 100 to rise. During the rising process, the transmission group 300 on the front lifting group 100 is separated from the first outer sleeve 110, and the chain 140 pulls the top sprocket 330 to rotate clockwise. At the same time, the bottom sprocket 130 rises with the wire sleeve 161. During the rising process, the distance between the bottom sprocket 130 and the top sprocket 330 remains unchanged. In this process, the length of the chain 140 between the top sprocket 330 and the first outer sleeve 110 is compensated by the length of the chain 140 between the bottom sprocket 130 and the first outer sleeve 110, so the chain 140 is always kept in a taut state. The top sprocket 330 rotates, driving the first umbrella wheel 340 coaxial therewith to rotate clockwise, and the first umbrella wheel 340 meshes with the second umbrella wheel 350, so that the second umbrella wheel 350 rotates counterclockwise, driving the second transmission shaft 320 to rotate synchronously, and then driving the transmission slide pipe 410 and the linkage slider 420 to rotate synchronously, thereby driving the second transmission shaft 320 in the transmission group 300 set on the rear lifting group 200 and the second umbrella wheel 350 coaxial therewith to rotate counterclockwise. The second umbrella wheel 350 drives the first umbrella wheel 340 meshing therewith to rotate clockwise, so that the top sprocket 330 coaxial with the first umbrella wheel 340 rotates clockwise synchronously, and the ring chain 240 engaged on the top sprocket 330 drives the linkage sprocket 230 at the bottom of the second lifting tube 220 to rotate clockwise, thereby driving the gear 250 to rotate clockwise, pressing the rack to climb, and completing the synchronous rise of the second lifting tube 220 and the transmission group 300 arranged on the top thereof, thereby completing the synchronous rise of the front lifting group 100 and the rear lifting group 200. Since the right-angle steering machine 150 on the two front pillars of the car body is synchronously driven, the front lifting group 100 and the rear lifting group 200 on the four pillars of the car body are synchronously risen.

[0042] On the contrary, when the canopy cover is to be lowered, the right-angle steering machine 150 is driven in the reverse direction, the screw rod 160 rotates in the reverse direction, the wire sleeve 161 descends along the screw rod 160, and the top sprocket wheel 330 is pulled counterclockwise by the chain 140, driving all components to rotate in the reverse direction, so that the canopy cover is synchronously lowered.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A canopy lifting transmission device, It is characterized in that The invention comprises a front lifting group (100), a rear lifting group (200), a transmission group (300) and a connection group (400), wherein the transmission group (300) is provided with two groups, and the two groups of the transmission groups (300) are respectively arranged on the top of the front lifting group (100) and the rear lifting group (200), and the two groups of the transmission groups (300) are linked via the connection group (400).

2. The canopy lifting transmission device according to claim 1, It is characterized in that The transmission group (300) comprises a first transmission shaft (310), a second transmission shaft (320), a top sprocket (330), a first umbrella wheel (340), and a second umbrella wheel (350) meshing with the first umbrella wheel (340); the top sprocket (330) and the first umbrella wheel (340) are coaxially connected via the first transmission shaft (310); and the second umbrella wheel (350) and the second transmission shaft (320) are coaxially connected.

3. The canopy lifting transmission device according to claim 2, It is characterized in that The front lifting group (100) comprises a first outer sleeve (110), a first lifting tube (120), a bottom sprocket (130) and a chain (140); the first lifting tube (120) is inserted into the first outer sleeve (110); the bottom sprocket (130) moves synchronously with the first lifting tube (120); one end of the chain (140) is fixed to the top of one side of the first outer sleeve (110); the other end of the chain (140) is fixed to the top of the other side of the first outer sleeve (110); the chain (140) is hung downward on the bottom sprocket (130) and hung upward on the top sprocket (330).

4. The canopy lifting transmission device according to claim 3, It is characterized in that The rear lifting group (200) comprises a second outer sleeve (210), a second lifting tube (220), a linkage sprocket (230), an endless chain (240), a gear (250), and a rack (260) meshed with the gear (250); the second lifting tube (220) is inserted into the second outer sleeve (210), the linkage sprocket (230) and the gear (250) are coaxially connected, the linkage sprocket (230) and the gear (250) are arranged at the bottom of the second lifting tube (220) and are rotatably connected to the second lifting tube (220), the rack (260) is arranged on the inner wall of the second outer sleeve (210), one end of the endless chain (240) is hung on the top sprocket (330), and the other end of the endless chain (240) is hung on the linkage sprocket (230).

5. The canopy lifting transmission device according to claim 3, It is characterized in that The front lifting group (100) further comprises a right-angle steering machine (150) and a screw rod (160), wherein the right-angle steering machine (150) is connected to the screw rod (160), the first lifting tube (120) is fixed to the top of a thread sleeve (161) of the screw rod (160), and the bottom sprocket (130) is connected to the thread sleeve (161) via a fixing plate.

6. The canopy lifting transmission device according to claim 5, It is characterized in that The front lifting group (100) further comprises a base (170), wherein the base (170) is fixedly connected to the bottom of the first outer sleeve (110), a screw rod limit platform (162) is arranged on the screw rod (160) at a position close to the right-angle steering gear (150), the screw rod limit platform (162) is clamped in the base (170), and a locking block (163) is arranged on the top of the screw rod (160).

7. The canopy lifting transmission device according to claim 4, It is characterized in that The transmission group (300) further comprises an L-shaped bracket (360) and a U-shaped bracket (370), wherein the L-shaped bracket (360) and the U-shaped bracket (370) are fixedly connected, and the two L-shaped brackets (360) are respectively fixedly arranged at the top of the first lifting tube (120) and the top of the second lifting tube (220), the first transmission shaft (310) is rotationally connected to the L-shaped bracket (360) and the U-shaped bracket (370), and the second transmission shaft (320) is rotationally connected to a bearing fixing plate arranged in the U-shaped bracket (370), and a slide rail (500) is arranged between the two U-shaped brackets (370) at the top of the front lifting group (100) and the rear lifting group (200).

8. The canopy lifting transmission device according to claim 2, It is characterized in that The connection group (400) comprises a transmission slide tube (410) and a linkage slider (420); the transmission slide tube (410) is fixedly connected to one group of the second transmission shafts (320); the linkage slider (420) is fixedly connected to another group of the second transmission shafts (320); the transmission slide tube (410) and the linkage slider (420) are slidably connected and rotate synchronously.

9. The canopy lifting transmission device according to claim 5, It is characterized in that The right-angle steering machine (150) comprises a first output shaft (151), a second output shaft (152) and an umbrella wheel assembly (153); the first output shaft (151) is linked to the second output shaft (152) via the umbrella wheel assembly (153); the first output shaft (151) is fixedly connected to the screw rod (160); one end of the second output shaft (152) is externally connected to a driving device; and two groups of the right-angle steering machines (150) are linked via the second output shaft (152).

10. The canopy lifting transmission device according to claim 9, It is characterized in that The umbrella wheel assembly (153) comprises a third umbrella wheel (154), a fourth umbrella wheel (155) meshed with the third umbrella wheel (154), a fifth umbrella wheel (157), a sixth umbrella wheel (158) meshed with the fifth umbrella wheel (157), and a third transmission shaft (156); the third umbrella wheel (154) is coaxially fixedly connected to the first output shaft (151); the sixth umbrella wheel (158) is coaxially fixedly connected to the second output shaft (152); the fourth umbrella wheel (155) and the fifth umbrella wheel (157) rotate synchronously via the third transmission shaft (156).

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