Multi-stage folding ladder stand device suitable for semitrailer

Abstract

The utility model relates to the technical field of semitrailers, in particular to a multi-stage folding type crawling ladder device suitable for a semitrailer, a second crawling ladder is further connected with a suspension tightening device, the suspension tightening device comprises a connecting plate arranged on the second crawling ladder, an inhaul cable is arranged between the connecting plate and the semitrailer, the inhaul cable is provided with a tightening structure, and the tightening structure is connected with the second crawling ladder. The inhaul cable is tightened through the tightening structure, so that the first crawling ladder and the second crawling ladder are close to each other and fixed, safety in the transportation process is guaranteed, and operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of semi-trailer technology, and in particular to a multi-stage folding ladder device suitable for semi-trailers. Background Technology

[0002] Semi-trailers are important transport equipment in road transportation, used for transporting large machinery, containers, and other items.

[0003] To facilitate the transport of vehicles, those skilled in the art have installed ladders at the rear of semi-trailers. These ladders include telescopic ladders and folding ladders, which can be stored away to reduce space occupation and improve safety performance.

[0004] Existing folding ladders include a ladder one connected to a semi-trailer, a ladder two hinged to the end of the ladder one, and a flipping drive device one connected to the ladder one. In the retracted state, the ladder one and the ladder two are fixed by a structure such as pins, which is inconvenient to operate. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-stage folding ladder device suitable for semi-trailers, which controls the ladder by the extension and retraction of a cable.

[0006] This utility model is achieved through the following technical solution: a multi-stage folding ladder device suitable for semi-trailers, including a ladder one connected to the semi-trailer, a ladder two provided at the end of the ladder one, a flipping drive device one connected to the ladder one, and a suspension tightening device connected to the ladder two. The suspension tightening device includes a connecting plate provided on the ladder two, a cable provided between the connecting plate and the semi-trailer, and a tightening structure provided on the cable.

[0007] Furthermore, the connecting plate is located at the end of the second ladder, the second ladder is hinged to the first ladder, and a hanging lug is connected to the second ladder near the middle position. The cable passes around the hanging lug and is connected to the semi-trailer.

[0008] Furthermore, the tightening structure includes a first pull rod and a second pull rod disposed on the cable, and a spacing adjustment structure is provided between the first pull rod and the second pull rod. When the spacing adjustment structure drives the first pull rod and the second pull rod to move closer together, the cable is tightened.

[0009] Furthermore, the tilting drive device includes a hydraulic cylinder 1 mounted on the semi-trailer. The hydraulic cylinder 1 is connected to the ladder 1 via a tilting seat. The tilting seat includes a hinge seat 1 connected to the hydraulic cylinder 1, a hinge seat 2 connected to the semi-trailer, and a hinge seat 3 connected to the ladder 1.

[0010] Furthermore, a self-locking structure is provided between the first ladder and the flipping seat. The self-locking structure includes a hinged seat four provided on the flipping seat. The hinged seat four is hinged to a telescopic arm. The first ladder is provided with a swing arm that is hinged to the telescopic arm. The swing arm is hinged to the first ladder. Under normal conditions, the telescopic arm pushes the swing arm closer to the first ladder.

[0011] Furthermore, the swing arm is connected to a support leg.

[0012] The beneficial effects of this utility model are as follows: the second ladder is also connected to a suspension tightening device, the suspension tightening device includes a connecting plate set on the second ladder, a cable is set between the connecting plate and the semi-trailer, the cable is provided with a tightening structure, the cable is tightened by the tightening structure, thereby bringing the first ladder and the second ladder closer together and fixed, ensuring safety during transportation and facilitating operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure under the transportation state of Example 1;

[0014] Figure 2 This is a schematic diagram of the structure in the flat state of Example 1;

[0015] Figure 3 This is a schematic diagram of the structure in the vertical state of Example 1;

[0016] Figure 4 This is a structural diagram of ladder one and ladder two in their unfolded state;

[0017] Figure 5 This is a schematic diagram of the flip-up seat structure.

[0018] The components include: 1. Semi-trailer; 2. Multi-stage folding ladder; 201. Ladder 1; 202. Ladder 2; 203. Hydraulic cylinder 1; 204. Tilting seat; 205. Telescopic boom; 206. Swing arm; 207. Connecting plate; 208. Hanging lug; 209. Cable; 210. Warning light; 211. Pull rod 1; 212. Pull rod 2; 213. Two-way threaded sleeve; 214. Operating handle; 215. Control section; 216. Slide groove; 217. Support leg; 218. Hinge seat 1; 219. Hinge seat 2; 220. Hinge seat 3; 221. Hinge seat 4. Detailed Implementation

[0019] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] Example 1

[0022] like Figure 1-5 As shown, a multi-stage folding ladder device suitable for semi-trailers is disclosed. The multi-stage folding ladder 2 specifically consists of two stages, including a ladder 1 201 connected to the semi-trailer 1, a ladder 202 hinged to the end of the ladder 1 201, and a tilting drive device 1 connected to the ladder 1 201. The tilting drive device 1 includes a hydraulic cylinder 203 mounted on the semi-trailer 1, the base of the hydraulic cylinder 203 hinged to the semi-trailer 1, and the hydraulic cylinder 203 connected to the ladder 1 201 via a tilting seat 204. The tilting seat 204 includes a hinge seat 218 connected to the hydraulic cylinder 203, a hinge seat 219 connected to the semi-trailer 1, and a hinge seat 220 connected to the ladder 1 201. Thus, the hydraulic cylinder 203 can drive the tilting seat 204 to tilt, thereby causing the ladder 1 201 to tilt.

[0023] A self-locking structure is also installed between the ladder 201 and the flip base 204. The self-locking structure includes a hinged seat 221 fixed on the flip base 204. The hinged seat 221 is hinged to a telescopic arm 205. A swing arm 206 is hinged to the ladder 201 and is hinged to the telescopic arm 205. The swing arm 206 is hinged to the ladder 201. Under normal conditions, the telescopic arm 205 pushes the swing arm 206 closer to the ladder 201. Specifically, the telescopic wall includes an outer arm and an inner arm inserted into the outer arm. The outer arm has a groove 216 machined along its length. The arm is equipped with positioning bolts that cooperate with the slide groove 216. After the telescopic arm 205 is adjusted to the target length, the length of the telescopic arm 205 is fixed by the clamping cooperation between the positioning bolts and the slide groove 216. When the ladder 201 is retracted, the telescopic arm 205 swings to the end close to the ladder 201 and is in a retracted state. Then the length of the telescopic arm 205 is fixed by the positioning bolts. Under the action of the telescopic arm 205 and the swing arm 206, the ladder 201 cannot rotate around the hinge seat 220, and thus forms a fixed connection with the flip seat 204, forming a self-locking mechanism.

[0024] The swing arm 206 is connected to the support leg 217. When the ladder 201 is open, the telescopic arm 205 is in an extended state and its length is fixed by the positioning bolt. The swing arm 206 swings downward and the support leg 217 is installed at the end of the swing arm 206, thus supporting the ground and forming support for the ladder 201.

[0025] Ladder 202 is also connected to a suspension tightening device, which includes a connecting plate 207 fixed to ladder 202. The connecting plate 207 extends away from the length direction of ladder 202, and its end is located outside ladder 1 201. A cable 209 is connected between the connecting plate 207 and the semi-trailer 1. The cable 209 is a round link chain, which is strong and easy to connect. The cable 209 is connected to a tightening structure, which includes a first pull rod 211 and a second pull rod 212 connected to the cable 209. The cable 209 between the first pull rod 211 and the second pull rod 212 forms a control section 215. The system is equipped with a spacing adjustment structure. Specifically, both pull rod 1 211 and pull rod 212 are threaded rods with different thread directions. The spacing adjustment structure includes a bidirectional threaded sleeve 213 fitted between pull rod 1 211 and pull rod 212. The bidirectional threaded sleeve 213 is connected to an operating handle 214. When pull rod 1 211 and pull rod 212 are driven closer by the operating handle 214, the cable 209 is tightened. Near the middle position of ladder 202, there is also a hanging lug 208. After the cable 209 passes around the hanging lug 208, it is connected to the semi-trailer 1, thereby pressing the middle position of ladder 202 towards ladder 1 201.

[0026] The multi-stage folding ladder device for semi-trailer 1 provided in this embodiment has three states.

[0027] In state 1, unloaded state, the hydraulic cylinder 203 drives the ladder 201 to fit against the semi-trailer frame 1 through the tilting seat 204, thereby reducing the height and improving safety performance.

[0028] State 2, transportation state: the hydraulic cylinder 203 drives the ladder 201 to be vertical through the tilting seat 204, thereby avoiding the loading space of the semi-trailer 1. In this state, the suspension tightening device presses the ladder 201 and the ladder 202 together to ensure transportation safety. A warning light 210 is also installed on the ladder 201 to improve safety performance.

[0029] State 3, loading and unloading state: Release the suspension tightening device, and the cable 209 leaves the hanging lug 208. The cable 209 is only connected to the connecting plate 207. During the lowering process, the cable 209 pulls the connecting plate 207, thereby causing the second ladder 202 to extend automatically for easy operation. After swinging the telescopic wall, the telescopic arm 205 is extended, causing the swing arm 206 to swing downward to cooperate with the ground, fixing the length of the telescopic arm 205, and then carrying out the loading and unloading operation.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage folding ladder device suitable for semi-trailers, comprising a ladder one connected to the semi-trailer, a ladder two being provided at one end of the ladder one, and a tilting drive device one being connected to the ladder one, characterized in that, The second ladder is also connected to a suspension tightening device, which includes a connecting plate on the second ladder, a cable between the connecting plate and the semi-trailer, and a tightening structure on the cable.

2. The multi-stage folding ladder device for semi-trailers according to claim 1, characterized in that, The connecting plate is located at the second end of the ladder, and the second ladder is hinged to the first ladder. A hook is also connected to the second ladder near its center, and the cable passes over the hook and connects to the semi-trailer. 。 3. The multi-stage folding ladder device for semi-trailers according to claim 2, characterized in that, The tightening structure includes a first pull rod and a second pull rod disposed on the cable. A spacing adjustment structure is provided between the first pull rod and the second pull rod. When the spacing adjustment structure drives the first pull rod and the second pull rod to move closer together, the cable is tightened.

4. The multi-stage folding ladder device for semi-trailers according to claim 1, characterized in that, The tilting drive device includes a hydraulic cylinder 1 mounted on the semi-trailer. The hydraulic cylinder 1 is connected to a ladder 1 via a tilting seat. The tilting seat includes a hinge seat 1 connected to the hydraulic cylinder 1, a hinge seat 2 connected to the semi-trailer, and a hinge seat 3 connected to the ladder 1.

5. The multi-stage folding ladder device for semi-trailers according to claim 4, characterized in that, A self-locking structure is also provided between the first ladder and the flipping seat. The self-locking structure includes a hinged seat four provided on the flipping seat. The hinged seat four is hinged to a telescopic arm. The first ladder is provided with a swing arm that is hinged to the telescopic arm. The swing arm is hinged to the first ladder. Under normal conditions, the telescopic arm pushes the swing arm closer to the first ladder.

6. The multi-stage folding ladder device for semi-trailers according to claim 5, characterized in that, The swing arm is connected to a supporting leg.

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