Cargo loading and lifting device

Abstract

The invention relates to the technical field of cargo lifting, in particular to a cargo loading and lifting device which comprises a bottom plate, a mounting frame is arranged on the bottom plate, a lead screw is arranged on the mounting frame, a lifting assembly is arranged on the lead screw, a box body is arranged on the bottom plate, a cavity is formed in the box body, a lifting assembly is arranged in the cavity, and a supporting column is arranged on the lower end face of the bottom plate. Supporting cavities are formed in the supporting columns, universal wheels are arranged in the supporting cavities, a cavity is formed in the bottom plate, a first belt wheel is arranged in the cavity, a rotating rod is arranged on the first belt wheel, a lifting assembly is arranged on the rotating rod, a telescopic rod is arranged on the lead screw located in the cavity, and a rotating assembly is further arranged in the cavity. By means of the structure, the lifting assemblies on the rotating rods drive the universal wheels to support the bottom plate, at the moment, the bottom plate can be transferred through the universal wheels, the bottom plate does not need to be manually carried, the bottom plate can be transferred to a proper position, and therefore actual use is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of cargo lifting, in particular to a cargo loading and lifting device. Background Art

[0002] In the daily production process, the goods need to be moved to the transport vehicle after production is completed. If they are moved by manpower, the efficiency is obviously low and the labor intensity is high. Some factories now use lifts to lift the goods for loading to improve loading efficiency.

[0003] For example, a cargo transport loading and lifting device disclosed in the patent with announcement number CN220502546U, although the cargo transport loading and lifting device, when in use, drives the lifting platform to rise and fall through the lifting mechanism to complete the lifting of the cargo, and when the cargo needs to be unloaded, the motor 1 is started to rotate the storage platform to the cargo unloading direction, and then the cylinder is started to tilt the storage platform, and the cargo slides from the required direction. The device is convenient for lifting the cargo and improves the loading and unloading efficiency; however, when the cargo transport loading and lifting device is actually used, when the position of the cargo transport loading and lifting device needs to be transferred, the staff needs to manually carry it to transfer the cargo transport loading and lifting device, which makes the transfer of the cargo transport loading and lifting device inconvenient, so it needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a cargo loading and lifting device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: The lifting device for loading and unloading cargoes comprises a base plate, a mounting frame is provided on the base plate, a rotatable screw rod is provided on the mounting frame, a lifting assembly for lifting cargoes is provided on the screw rod, a box body is provided on the base plate, a cavity with an opening on one side is provided in the box body, a lifting assembly for lifting the base plate is provided in the cavity, a supporting column is provided on the lower end surface of the base plate and at four corners, a supporting cavity is provided in the supporting column, a universal wheel is provided in the supporting cavity, a cavity is provided in the base plate for inserting the lower end of the screw rod, a rotatable first pulley is provided in the cavity, a rotating rod with one end extending out of the base plate is provided on the first pulley, a lifting assembly is provided on the rotating rod, the first pulley drives the rotating rod to rotate, so that the lifting assembly drives the universal wheel to slide out of the supporting cavity, a retractable telescopic rod is provided on the screw rod in the cavity, a rotating assembly is also provided in the cavity, and the lower end of the telescopic rod is inserted into the rotating assembly for driving the first pulley to rotate.

[0006] Preferably, a through groove which is opposite to and penetrates the bottom plate is provided on the bottom wall of the cavity along its width direction; The lifting assembly includes round rods that are relative and rotatable in a cavity, and gears that mesh with each other are sleeved on both ends of the two round rods. Swing rods are provided on the side walls of the gears. The rotation of the round rods is used to drive the swing rods on the gears to extend out of the corresponding through grooves, thereby realizing the lifting of the base plate by the swing rods.

[0007] Preferably, a slide groove is provided on the side wall of the support cavity along its height direction; The lifting assembly includes a threaded ring arranged on a rotating rod, the threaded ring and the rotating rod are threadedly matched, a plurality of connecting rods are arranged on the side wall of the threaded ring along its circumference, one end of the connecting rod passes through a slide groove and is connected to a corresponding universal wheel, and the rotation of the rotating rod is used to drive the connecting rod on the threaded ring to lift and lower, thereby realizing the sliding of the universal wheel out of the supporting cavity.

[0008] Preferably, the rotating assembly includes a rotatable mounting rod disposed in the cavity, a second pulley is sleeved on the mounting rod, a transmission belt is sleeved between the second pulley and the first pulley, and the rotation of the second pulley is used to drive the first pulley to rotate.

[0009] Preferably, a mounting groove is provided on the mounting rod, a downwardly opening sliding cavity is provided in the screw rod, and a blocking plate is provided at the opening of the sliding cavity; The telescopic rod includes a sliding plate which is arranged in the sliding cavity and can slide. The sliding plate is provided with an insertion rod whose one end passes through the blocking plate. A spring is provided in the sliding cavity. The spring is used to drive the insertion rod on the sliding plate to insert into the installation groove, so that the screw rod drives the second pulley to rotate. The screw rod is also provided with a driving member for driving the insertion rod to slide out of the installation groove.

[0010] Preferably, a relative card slot is provided on the side wall of the sliding cavity, the card slot is arranged along the height direction of the screw rod, and a card block is provided on the side wall of the sliding plate, which is opposite and has one end extending out of the card slot; The driving member includes a driving ring on the screw rod, the driving ring and the screw rod are threaded together, and the lifting and lowering of the driving ring thread is used to push the clamping block to slide along the clamping groove, so that the insertion rod can slide out of the installation groove.

[0011] Preferably, an interception ring for intercepting the threaded ring is provided at the lower end of the rotating rod.

[0012] Preferably, a push handle is provided on the mounting frame for pushing the base plate to move.

[0013] Preferably, a first motor for driving the screw rod to rotate is provided on the mounting frame.

[0014] Preferably, a second motor for driving the round rod to rotate is provided on one side wall of the box body.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention drives the universal wheel to slide out of the support cavity through the lifting assembly on the rotating rod, so that the universal wheel supports the bottom plate. At this time, the bottom plate can be transferred through the universal wheel. Compared with the existing ones, this kind of cargo loading and lifting device does not need to be manually moved to the bottom plate during actual use, and the bottom plate can be transferred to a suitable position, which is convenient for actual use.

[0016] 2. In the present invention, a push handle for pushing the bottom plate to move is fixed on the mounting frame. When the universal wheel supports the bottom plate, the staff can push the bottom plate to move by the push handle, thereby facilitating practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a cargo loading and lifting device in the present invention.

[0018] Figure 2 It is a schematic cross-sectional structural diagram of the lifting assembly in the present invention.

[0019] Figure 3 It is a schematic cross-sectional structural diagram of the telescopic rod in the screw rod of the present invention.

[0020] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0021] Figure 5 It is a schematic cross-sectional structural diagram of rotating the first pulley and the second pulley in the present invention.

[0022] Figure 6 It is a structural schematic diagram of the lifting assembly in the present invention.

[0023] The meaning of the symbols in the figure is: 100, bottom plate; 101, support column; 110, mounting frame; 111, groove; 120, screw rod; 121, lifting plate; 130, box body; 140, push handle; 150, first motor; 160, second motor; 201, cavity; 202, through slot; 210, rotating rod; 211, intercepting ring; 220, round rod; 221, gear; 222, swing rod; 301, support cavity; 310, universal wheel; 321, cavity; 330, protrusion; 340, fixing ring.

[0024] 400, mounting rod; 410, second pulley; 420, transmission belt; 431, sliding cavity; 432, card slot; 440, blocking plate; 450, sliding plate; 451, card block; 460, insertion rod; 470, spring; 480, driving ring; 500, first pulley; 510, threaded ring; 601. slideway; 610. connecting rod. DETAILED DESCRIPTION

[0025] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0026] The following is combined with Figure 1-Figure 6 This embodiment is described in further detail.

[0027] like Figure 1 As shown, a cargo loading and lifting device in this embodiment includes a bottom plate 100, a mounting frame 110 is provided on the bottom plate 100, a rotatable screw rod 120 is provided on the mounting frame 110, a lifting assembly for lifting cargo is provided on the screw rod 120, a box body 130 is provided on the bottom plate 100, a cavity 201 with an opening on one side is provided in the box body 130, a lifting assembly for lifting the bottom plate 100 is provided in the cavity 201, support columns 101 are provided on the lower end surface of the bottom plate 100 and at four corners, support cavities 301 are provided in the support columns 101, and universal wheels 310 are provided in the support cavities 301. A cavity 321 is provided in the base plate 100 for inserting the lower end of the screw rod 120, a rotatable first pulley 500 is provided in the cavity 321, a rotating rod 210 with one end extending out of the base plate 100 is provided on the first pulley 500, a lifting assembly is provided on the rotating rod 210, the first pulley 500 drives the rotating rod 210 to rotate, so that the lifting assembly drives the universal wheel 310 to slide out of the supporting cavity 301, a retractable telescopic rod is provided on the screw rod 120 located in the cavity 321, and a rotating assembly is also provided in the cavity 321, and the lower end of the telescopic rod is inserted into the rotating assembly to drive the first pulley 500 to rotate.

[0028] In this embodiment, the mounting frame 110 is fixedly mounted on the base plate 100, and a relative groove 111 is opened on the side wall of the mounting frame 110 along its height direction. The lifting assembly includes a lifting plate 121 threadedly sleeved on the screw rod 120, and a protrusion 330 is fixedly mounted on the lifting plate 121 and inserted into the corresponding groove 111. When the screw rod 120 rotates, the groove 111 limits the protrusion 330, so that the lifting plate 121 can be lifted and lowered along the screw rod 120. When the lifting plate 121 is located at the lower end of the screw rod 120, the staff puts the goods on the lifting plate 121. By lifting and lowering the lifting plate 121, the goods can be lifted and lowered to a suitable height. Then, the staff can load the goods onto the transport vehicle, thereby reducing the manpower in handling goods. Among them, the rotating rod 210 is fixedly installed on the first pulley 500, and the rotating rod 210 is rotatably installed on the bottom wall of the cavity 321 through a bearing. When the bottom plate 100 needs to be transferred to other places to lift the goods, the bottom plate 100 is lifted by the lifting assembly, so that the support column 101 on the bottom plate 100 is also lifted. Then, the telescopic rod on the screw rod 120 is inserted into the rotating assembly. When the screw rod 120 drives the telescopic rod to rotate, the telescopic rod can drive the first pulley 500 to rotate through the rotating assembly. The rotation of the first pulley 500 drives the rotating rod 210 to rotate. When the rotating rod 21 0 is rotated, the universal wheel 310 can be extended from the support cavity 301 through the lifting assembly. At this time, the lifting of the bottom plate 100 by the lifting assembly is released, so that the universal wheel 310 supports the bottom plate 100. Then, the staff can move the bottom plate 100 to other places for use through the universal wheel 310. After the bottom plate 100 is moved to other places, the universal wheel 310 is retracted into the support cavity 301 through the lifting assembly, so that the support column 101 supports the bottom plate 100, thereby preventing the bottom plate 100 from moving through the universal wheel 310 when the lifting plate 121 lifts the goods, thereby affecting the actual use; Among them, the lifting assembly on the rotating rod 210 can drive the universal wheel 310 to slide out of the supporting cavity 301, so that the universal wheel 310 supports the bottom plate 100. At this time, the bottom plate 100 can be transferred through the universal wheel 310. Compared with the existing ones, this type of cargo loading and lifting device does not require manual transportation of the bottom plate 100 during actual use, and the bottom plate 100 can be transferred to a suitable position, thereby facilitating actual use.

[0029] The support column 101 is fixedly mounted on the bottom plate 100. When the lifting plate 121 lifts the goods, the lower end surface of the support column 101 abuts against the ground to support the bottom plate 100. When the screw rod 120 rotates to drive the lifting plate 121 to lift the goods, the telescopic rod on the screw rod 120 will not be inserted into the rotating assembly. At this time, the rotation of the screw rod 120 will not drive the rotating assembly to rotate, that is, the first pulley 500 will not rotate; The upper end of the screw rod 120 is mounted on the mounting frame 110 through a bearing, and the lower end of the screw rod 120 is mounted on the bottom plate 100 through a bearing to realize the rotation rod 210 of the screw rod 120. A first motor 150 for driving the screw rod 120 to rotate is fixed on the mounting frame 110. The output shaft of the first motor 150 is connected to the screw rod 120, and the screw rod 120 can be driven to rotate by the first motor 150. The box body 130 is fixedly mounted on the base plate 100 to realize the installation of the lifting assembly on the base plate 100; Among them, a push handle 140 for pushing the bottom plate 100 to move is fixed on the mounting frame 110. When the universal wheel 310 supports the bottom plate 100, the staff can push the bottom plate 100 to move through the push handle 140, so as to facilitate actual use; In actual use, when the universal wheel 310 extends out from the supporting cavity 301 , no goods will be placed on the lifting plate 121 .

[0030] like Figure 1-5 As shown, in this embodiment, a through groove 202 which is opposite to and penetrates the bottom plate 100 is opened on the bottom wall of the cavity 201 along its width direction; The lifting assembly includes round rods 220 that are relative and rotatable in a cavity 201, and gears 221 that mesh with each other are sleeved on both ends of the two round rods 220. Swing rods 222 are provided on the side walls of the gears 221. The rotation of the round rods 220 is used to drive the swing rods 222 on the gears 221 to extend out of the corresponding through grooves 202, thereby realizing the lifting of the base plate 100 by the swing rods 222.

[0031] In this embodiment, by setting the through groove 202, round rod 220, gear 221 and swing rod 222, the two ends of the round rod 220 are rotatably installed in the cavity 201 through bearings, the gear 221 is fixedly installed on the round rod 220, and the swing rod 222 is fixedly installed on the side wall of the gear 221. When one of the two round rods 220 rotates, the round rod 220 rotates to drive the gear 221 to rotate, and the gear 221 rotates to drive the meshing gear 221 to rotate. At this time, the swing rod 222 on the gear 221 rotates along the circumference of the gear 221, so that one end of the swing rod 222 passes through the through groove 202 and abuts on the ground. When one end of the swing rod 222 abuts on the ground, the round rod 220 continues to drive the gear 221 to rotate. At this time, one end of the swing rod 222 can lift the bottom plate 100. A second motor 160 for driving the round rod 220 to rotate is fixedly mounted on one side wall of the box body 130, and the output shaft of the second motor 160 is fixedly connected to one of the two round rods 220, so that the swing rod 222 can be driven by the second motor 160 to lift the bottom plate 100; In actual use, the second motor 160 is an existing self-locking motor. When the base plate 100 moves through the universal wheel 310, the output shaft of the second motor 160 locks the rotation of the round rod 220, thereby preventing the round rod 220 from rotating to drive one end of the swing rod 222 to slide out of the through groove 202 when the base plate 100 moves, thereby affecting the movement of the base plate 100.

[0032] like Figure 1-6As shown, in this embodiment, a slide groove 601 is provided on the side wall of the support cavity 301 along its height direction; The lifting assembly includes a threaded ring 510 arranged on the rotating rod 210, and the threaded ring 510 and the rotating rod 210 are threadedly matched. A plurality of connecting rods 610 are arranged on the side wall of the threaded ring 510 along its circumference. One end of the connecting rod 610 passes through the slide groove 601 and is connected to the corresponding universal wheel 310. The rotation of the rotating rod 210 is used to drive the connecting rod 610 on the threaded ring 510 to lift and lower, so as to slide the universal wheel 310 out of the support cavity 301.

[0033] In this embodiment, by setting the slide groove 601, the threaded ring 510 and the connecting rod 610, one end of the connecting rod 610 is fixedly connected to the corresponding universal wheel 310, and the other end of the connecting rod 610 is fixedly connected to the threaded ring 510. The slide groove 601 limits the connecting rod 610. When the base plate 100 is lifted and the rotating rod 210 is rotated, the threaded ring 510 is lifted and lowered along the rotating rod 210. At this time, the lifting of the threaded ring 510 can drive the universal wheel 310 to slide out of the supporting cavity 301 through the connecting rod 610, so that the universal wheel 310 supports the base plate 100. In actual use, an interception ring 211 for intercepting the threaded ring 510 is fixedly installed at the lower end of the rotating rod 210. The threaded ring 510 is limited by the interception ring 211 to prevent the threaded ring 510 from rotating out of the rotating rod 210 and affecting actual use.

[0034] like Figure 1-5 As shown, in this embodiment, the rotating assembly includes a rotatable mounting rod 400 disposed in the cavity 321, a second pulley 410 is sleeved on the mounting rod 400, a transmission belt 420 is sleeved between the second pulley 410 and the first pulley 500, and the rotation of the second pulley 410 is used to drive the first pulley 500 to rotate.

[0035] In this embodiment, by setting the mounting rod 400, the second pulley 410 and the transmission belt 420, the second pulley 410 is fixedly mounted on the mounting rod 400, and the mounting rod 400 is rotatably mounted in the cavity 321 through a bearing. When the second pulley 410 rotates, the transmission belt 420 can drive the first pulley 500 to rotate, and the rotation of the first pulley 500 can realize the rotation of the rotating rod 210.

[0036] like Figure 1-5 As shown, in this embodiment, a mounting groove is provided on the mounting rod 400, a downwardly opening sliding cavity 431 is provided in the screw rod 120, and a blocking plate 440 is provided at the opening of the sliding cavity 431; The telescopic rod includes a slide plate 450 which is arranged in the slide cavity 431 and can slide. The slide plate 450 is provided with an insertion rod 460 whose one end passes through the blocking plate 440. A spring 470 is provided in the slide cavity 431. The spring 470 is used to drive the insertion rod 460 on the slide plate 450 to be inserted into the installation groove, so that the screw rod 120 drives the second pulley 410 to rotate. The screw rod 120 is also provided with a driving member for driving the insertion rod 460 to slide out of the installation groove.

[0037] In this embodiment, by setting the mounting groove, the sliding cavity 431, the blocking plate 440, the slide plate 450, the insertion rod 460, the spring 470 and the driving member, the insertion rod 460 is fixedly installed on the slide plate 450, the blocking plate 440 is fixedly installed at the opening in the sliding cavity 431, and the blocking plate 440 intercepts the slide plate 450 and the spring 470 in the sliding cavity 431, so that the slide plate 450 and the spring 470 are installed in the sliding cavity 431. When the spring 470 pushes the slide plate 450 to move toward the blocking plate 440, the insertion rod 460 on the slide plate 450 is stuck in the mounting groove. At this time, the rotation of the screw rod 120 can drive the slide plate 450 to rotate, and the rotation of the slide plate 450 can drive the installation rod 400 to rotate through the insertion rod 460, thereby realizing the rotation of the second pulley 410; The sliding cavity 431, the slide plate 450, the insertion rod 460 and the installation groove are all square, so that the rotation of the screw rod 120 can drive the slide plate 450 to rotate, and when the insertion rod 460 is inserted into the installation groove, the rotation of the insertion rod 460 can drive the installation rod 400 to rotate; When the spring 470 pushes the slide plate 450 to move toward the blocking plate 440, the insertion rod 460 on the slide plate 450 does not correspond to the installation slot, and the insertion rod 460 cannot be inserted into the installation slot. At this time, the screw rod 120 continues to drive the slide plate 450 to rotate. When the insertion rod 460 on the slide plate 450 corresponds to the installation slot, the insertion rod 460 will automatically snap into the installation slot under the elastic force of the spring 470, so that the insertion rod 460 can be accurately snapped into the installation slot. In actual use, when the lifting plate 121 lifts the goods, the driving member needs to drive the insertion rod 460 to slide out of the installation groove. At this time, when the screw rod 120 drives the insertion rod 460 to rotate, the installation rod 400 will not rotate.

[0038] like Figure 1-4 As shown, in this embodiment, a relative slot 432 is provided on the side wall of the sliding cavity 431, and the slot 432 is arranged along the height direction of the screw rod 120, and a relative block 451 is provided on the side wall of the slide plate 450, and one end of the block 451 extends out of the slot 432; The driving member includes a driving ring 480 on the screw rod 120, and the driving ring 480 is threadedly matched with the screw rod 120. The threaded lifting of the driving ring 480 is used to push the block 451 to slide along the slot 432, so that the insertion rod 460 can slide out of the installation slot.

[0039] In this embodiment, by setting the card slot 432, the card block 451 and the driving ring 480, the card block 451 is fixedly installed on the slide plate 450. When the driving ring 480 is threadedly rotated on the screw rod 120, the lifting and lowering of the driving ring 480 thread will push the card block 451 to move up along the card slot 432. At this time, the slide plate 450 drives the insertion rod 460 to slide out of the installation slot, so that the rotation of the screw rod 120 will not drive the installation rod 400 to rotate. The staff can rotate the drive ring 480 through the opening of the cavity 201; In actual use, a fixing ring 340 is fixedly installed on the screw rod 120, and the fixing ring 340 is located above the card slot 432, so as to prevent the lifting plate 121 from moving down too much along the screw rod 120, causing the lifting plate 121 to squeeze the card block 451, thereby affecting actual use.

[0040] Working principle: First, place the goods on the lifting plate 121, and then, drive the screw rod 120 to rotate through the first motor 150, so that the lifting plate 121 can lift the goods to a suitable height, and then the staff can load it onto the transport vehicle. When the base plate 100 needs to be transferred to other places for use, the round rod 220 is driven to rotate by the second motor 160, and the round rod 220 drives the swing rod 222 to lift the base plate 100. At this time, by rotating the drive ring 480, the block 451 moves down along the slot 432, so that the insertion rod 460 is inserted into the installation slot, and then, the screw rod 120 is driven to rotate by the first motor 150, and the screw rod 120 rotates to drive the installation rod 400 to rotate through the insertion rod 460, and the installation rod 40 0 rotation can drive the rotating rod 210 to rotate, and the rotating rod 210 rotates to drive the threaded ring 510 to rise and fall. The lifting of the threaded ring 510 can slide the universal wheel 310 out of the support cavity 301 through the connecting rod 610. At this time, the universal wheel 310 supports the bottom plate 100, and then, the second motor 160 is driven to release the swing rod 222 to lift the bottom plate 100. Finally, the staff can push the bottom plate 100 to transfer through the push handle 140. When the bottom plate 100 is transferred to a suitable position, it is necessary to drive the rod lead screw 120 to rotate again through the first motor 150. The lead screw 120 rotates and drives the rotating rod 210 to rotate through the insertion rod 460, so that the threaded ring 510 on the rotating rod 210 drives the universal wheel 310 to be retracted into the support cavity 301.

[0041] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A cargo loading and lifting device, comprising a bottom plate (100), characterized in that: A mounting frame (110) is provided on the bottom plate (100), a rotatable screw rod (120) is provided on the mounting frame (110), a lifting assembly for lifting goods is provided on the screw rod (120), a box body (130) is provided on the bottom plate (100), a cavity (201) with an opening on one side is provided in the box body (130), a lifting assembly for lifting the bottom plate (100) is provided in the cavity (201), support columns (101) are provided on the lower end surface of the bottom plate (100) and at four corners, support cavities (301) are provided in the support columns (101), universal wheels (310) are provided in the support cavities (301), and a screw rod is provided in the bottom plate (100). The lower end of the support member (120) is inserted into a cavity (321), a rotatable first pulley (500) is provided in the cavity (321), a rotating rod (210) with one end extending out of the bottom plate (100) is provided on the first pulley (500), a lifting assembly is provided on the rotating rod (210), the first pulley (500) drives the rotating rod (210) to rotate, so that the lifting assembly drives the universal wheel (310) to slide out of the support cavity (301), a retractable telescopic rod is provided on the screw rod (120) located in the cavity (321), and a rotating assembly is also provided in the cavity (321), and the lower end of the telescopic rod is inserted into the rotating assembly to drive the first pulley (500) to rotate.

2. A cargo loading and lifting device according to claim 1, characterized in that: A through groove (202) is provided on the bottom wall of the cavity (201) along its width direction and is opposite to and penetrates the bottom plate (100); The lifting assembly comprises round rods (220) which are arranged relative to and rotatable in a cavity (201), and gears (221) which mesh with each other are sleeved at both ends of the two round rods (220), and swing rods (222) are arranged on the side walls of the gears (221). The round rods (220) rotate to drive the swing rods (222) on the gears (221) to extend out of the corresponding through slots (202), so as to achieve lifting of the base plate (100) by the swing rods (222).

3. A cargo loading and lifting device according to claim 1, characterized in that: A slide groove (601) is provided on the side wall of the support cavity (301) along its height direction; The lifting assembly comprises a threaded ring (510) arranged on a rotating rod (210), the threaded ring (510) and the rotating rod (210) being threadedly matched, a plurality of connecting rods (610) are arranged on the side wall of the threaded ring (510) along its circumference, one end of the connecting rod (610) passes through a slide groove (601) and is connected to a corresponding universal wheel (310), and the rotating rod (210) is rotated to drive the connecting rod (610) on the threaded ring (510) to be lifted and lowered, thereby sliding the universal wheel (310) out of the supporting cavity (301).

4. A cargo loading and lifting device according to claim 1, characterized in that: The rotating assembly comprises a rotatable mounting rod (400) disposed in the cavity (321); a second belt pulley (410) is sleeved on the mounting rod (400); a transmission belt (420) is sleeved between the second belt pulley (410) and the first belt pulley (500); the second belt pulley (410) rotates to drive the first belt pulley (500) to rotate.

5. A cargo loading and lifting device according to claim 4, characterized in that: A mounting groove is formed on the mounting rod (400), a downwardly opening sliding cavity (431) is formed in the screw rod (120), and a blocking plate (440) is provided at the opening of the sliding cavity (431); The telescopic rod comprises a slide plate (450) which is arranged in the slide cavity (431) and can slide. The slide plate (450) is provided with an insertion rod (460) whose one end passes through the blocking plate (440). A spring (470) is provided in the slide cavity (431). The spring (470) is used to drive the insertion rod (460) on the slide plate (450) to be inserted into the installation groove, so that the screw rod (120) drives the second pulley (410) to rotate. The screw rod (120) is also provided with a driving member for driving the insertion rod (460) to slide out of the installation groove.

6. A cargo loading and lifting device according to claim 5, characterized in that: A corresponding clamping groove (432) is provided on the side wall of the sliding cavity (431), and the clamping groove (432) is arranged along the height direction of the screw rod (120). A clamping block (451) is provided on the side wall of the sliding plate (450) and one end of the clamping block extends out of the clamping groove (432). The driving member comprises a driving ring (480) provided on the screw rod (120), wherein the driving ring (480) and the screw rod (120) are threadedly matched, and the threaded lifting of the driving ring (480) is used to push the clamping block (451) to slide along the clamping groove (432), thereby enabling the insertion rod (460) to slide out of the installation groove.

7. A cargo loading and lifting device according to claim 3, characterized in that: An interception ring (211) for intercepting the threaded ring (510) is provided at the lower end of the rotating rod (210).

8. The cargo loading and lifting device according to claim 1, characterized in that: The mounting frame (110) is provided with a push handle (140) for pushing the bottom plate (100) to move.

9. The cargo loading and lifting device according to claim 5, characterized in that: The mounting frame (110) is provided with a first motor (150) for driving the screw rod (120) to rotate.

10. A cargo loading and lifting device according to claim 2, characterized in that: A second motor (160) for driving the round rod (220) to rotate is provided on one side wall of the box body (130).

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