CN111251468A

CN111251468A - Agitating lorry and ladder stand device thereof

Info

Publication number: CN111251468A
Application number: CN202010174684.2A
Authority: CN
Inventors: 蔡加加; 房坤; 瞿绘军; 刘晨
Original assignee: Yangzhou CIMC Tonghua Special Vehicles Co Ltd
Current assignee: Yangzhou CIMC Tonghua Special Vehicles Co Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-06-09

Abstract

The invention provides a stirring vehicle and a ladder climbing device thereof. The ladder climbing device comprises a main ladder and an auxiliary ladder. The main ladder comprises two supporting beams arranged in parallel at intervals and a connecting beam connected between the bottoms of the two supporting beams; the two supporting beams are provided with vertically extending rails; the auxiliary ladder comprises an auxiliary ladder main body, sliding assemblies symmetrically arranged on two sides of the auxiliary ladder main body and overturning supports symmetrically arranged on two sides of the main ladder; the two sliding assemblies are correspondingly matched with the two rails in a sliding manner, so that the auxiliary ladder can slide upwards to be accommodated in the main ladder or extend downwards out of the main ladder; one end of each overturning bracket is hinged with one side of the middle area of the auxiliary ladder main body, and the other end of each overturning bracket is hinged with the corresponding sliding component; when the sliding component slides upwards, the overturning bracket is overturned from the horizontal position to the vertical position, so that the auxiliary ladder slides upwards to be accommodated in the main ladder; when the sliding assembly slides downwards, the overturning support rotates to a horizontal position from a vertical position, so that the auxiliary ladder extends downwards out of the main ladder, and the overturning support is abutted to the connecting beam.

Description

Agitating lorry and ladder stand device thereof

Technical Field

The invention relates to the field of transport vehicles, in particular to a stirring vehicle and a ladder climbing device thereof.

Background

The mixer truck is a special vehicle widely applied to engineering and building industries and used for carrying mixed concrete. The mixer truck is usually provided with a ladder stand for workers to go up and down so as to wash, inspect, maintain and the like the top parts of the feed inlet, the feed hopper and the like of the mixer truck.

At present, the cat ladder is fixed in on the frame of trucd mixer, and its bottom is located frame department usually, and leads to the bottom of cat ladder to be higher apart from ground, and makes the staff waste time and energy from top to bottom.

Disclosure of Invention

The invention aims to provide a stirring vehicle convenient to crawl up and down and a ladder climbing device thereof, and aims to solve the problems in the prior art.

In order to solve the technical problem, the invention provides a ladder climbing device of a mixer truck, which comprises: the main ladder is fixed at the rear side of the mixer truck; the main ladder comprises two supporting beams arranged in parallel at intervals and a connecting beam connected between the bottoms of the two supporting beams; the two supporting beams are provided with vertically extending rails; the auxiliary ladder comprises an auxiliary ladder main body, sliding assemblies symmetrically arranged on two sides of the auxiliary ladder main body and overturning supports symmetrically arranged on two sides of the main ladder; the two sliding assemblies are correspondingly matched with the two rails in a sliding manner, so that the auxiliary ladder can slide upwards to be accommodated in the main ladder or extend downwards out of the main ladder; one end of each overturning bracket is hinged with one side of the middle area of the auxiliary ladder main body, and the other end of each overturning bracket is hinged with the corresponding sliding component; when the sliding component slides upwards, the overturning bracket overturns from a horizontal position to a vertical position, so that the auxiliary ladder slides upwards to be accommodated in the main ladder; when the sliding assembly slides downwards, the overturning support rotates to a horizontal position from a vertical position, so that the auxiliary ladder extends downwards out of the main ladder, and the overturning support is abutted to the connecting beam.

In one embodiment, the turnover support comprises a turnover plate and a bending plate which are integrally formed; the two ends of the turnover plate are respectively hinged with the auxiliary ladder main body and the sliding assembly, the bending plate is vertically connected to the middle of the turnover plate, the turnover support slides to be in a horizontal position, the bending plate is located at the top of the turnover plate, the bending plate is abutted to the auxiliary ladder main body, and the bottom of the turnover plate is abutted to the connecting beam.

In one embodiment, each support beam comprises two wing plates arranged in parallel at intervals and a web plate for connecting the two wing plates, the two wing plates and the web plate enclose to form a groove, and the groove forms the track; the connecting beam comprises a bottom plate and a side plate perpendicular to the bottom plate, the side plate is fixedly connected with one side of an opening of the groove of the supporting beam, and the bottom plate is located at the bottom of the supporting beam and supports the supporting beam.

In one embodiment, the auxiliary ladder main body comprises two side beams arranged in parallel at intervals and pedal rods connected between the two side beams, and the pedal rods are arranged at intervals along the length direction of the side beams; the main ladder also comprises two limiting brackets arranged on the connecting beam, the two limiting brackets are arranged corresponding to the two supporting beams, and the limiting brackets are positioned on the inner sides of the corresponding supporting beams; each limiting support is provided with a limiting groove, when the auxiliary ladder is accommodated in the main ladder, the bottom ends of the two side beams are respectively and correspondingly positioned in the limiting grooves, and the auxiliary ladder is limited by simultaneously penetrating through the limiting supports and the side beams through limiting pins.

In one embodiment, each of the limiting brackets includes two limiting plates arranged in parallel at intervals and a connecting plate connecting the two limiting plates, and the two limiting plates and the connecting plate are erected on the connecting beam to form a limiting groove in an enclosing manner.

In one embodiment, the limit pin comprises a rotating head, a limit rod connected with the rotating head, a limit block and a fixed block, wherein the limit block and the fixed block are connected between the rotating head and the limit rod, the fixed block is provided with a positioning groove and a through hole which are communicated with each other, the limit rod can penetrate through the through hole and be inserted into the limit bracket and the side beam, and the limit block is matched with the positioning groove in shape, so that the limit block can be completely contained in the positioning groove or positioned outside the positioning groove and abutted against the outer wall of the opening of the positioning groove.

In one embodiment, the side part of the side beam is provided with a positioning hole; the side part of the supporting beam is provided with a locking hole corresponding to the positioning hole; when the auxiliary ladder is accommodated in the main ladder, the positioning pin is inserted into the positioning hole and the locking hole at the same time to position the auxiliary ladder.

In one embodiment, the sliding assembly comprises a top roller arranged at the top of the auxiliary ladder main body and a middle roller arranged in the middle of the auxiliary ladder main body, and the overturning bracket is hinged to the middle roller.

In one embodiment, the two protection frames of the main ladder are fixed on two sides of the top of the support beam, the platform of the main ladder is fixed in the middle of the support beam, and the protection frames are located above the platform and have a height difference therebetween.

In one embodiment, the platform includes a plurality of parallel beams spaced apart from each other, a flat plate disposed on the beams, and baffles standing on two ends of the flat plate, wherein the flat plate is connected to the two support beams, and the two baffles respectively correspond to the two support beams.

In one embodiment, the two protection frames are respectively arranged corresponding to the two support beams, each protection frame comprises two side protection rods arranged in parallel at intervals and a connecting rod for connecting the two side protection rods, the protection rods are vertically connected with the corresponding support beams, the protection rods extend along the width direction of the mixer truck, and the connecting rods extend along the vertical direction.

The invention also provides a mixer truck, which comprises a truck frame and the ladder climbing device, wherein the ladder climbing device is positioned at the rear side of the mixer truck and is fixed on the truck frame.

According to the technical scheme, the invention has the advantages and positive effects that:

the ladder climbing device comprises a main ladder and an auxiliary ladder. The main ladder is arranged at the rear side of the mixer truck, and a vertically extending track is arranged on the main ladder. The auxiliary ladder can slide relatively along the track of the main ladder, so that the auxiliary ladder can slide downwards to extend out of the main ladder or slide upwards to be accommodated in the main ladder. The one end of the upset support of vice ladder is connected with the regional one side of vice ladder main part middle part is articulated, and the other end is connected with the subassembly that slides that corresponds is articulated, and when vice ladder glided downwards to stretching out the main ladder outside, the upset support rotated to horizontal position by vertical position, and the tie-beam butt of upset support and main ladder. The auxiliary ladder can extend downwards out of the main ladder through downward sliding of the auxiliary ladder, so that the ground clearance of the auxiliary ladder is reduced, and workers can conveniently climb up the ladder climbing device to work. When the auxiliary ladder extends downwards out of the main ladder, the overturning support is in a horizontal position, so that an included angle is formed between the auxiliary ladder and the main ladder, namely the auxiliary ladder inclines, the ladder climbing device accords with ergonomics, and workers can climb up and down the ladder climbing device more safely and comfortably.

Drawings

FIG. 1 is a first directional view of one embodiment of the truck mixer of the present invention;

FIG. 2 is a second directional view of one embodiment of the truck mixer of the present invention;

fig. 3 is a first directional view of the auxiliary ladder extending from the main ladder in the ladder climbing device of the present invention;

fig. 4 is a second directional view of the extension of the auxiliary ladder from the main ladder in the ladder climbing device of the present invention;

fig. 5 is a first direction view of the auxiliary ladder accommodated in the main ladder in the ladder climbing device of the present invention;

fig. 6 is a second direction view of the auxiliary ladder accommodated in the main ladder in the ladder climbing device of the present invention;

FIG. 7 is a schematic structural view of one embodiment of the roll-over stand of the present invention;

FIG. 8 is a first directional view of one embodiment of the roll-over stand of the present invention;

fig. 9 is a schematic structural view of the spacing pin of the present invention.

Wherein the reference numerals are as follows: 100. a mixer truck; 1. a frame; 2. a mixing drum; 3. a ladder climbing device; 31. a main ladder; 311. a support beam; 3111. a locking hole; 312. a connecting beam; 3121. a base plate; 3122. a side plate; 313. a limiting bracket; 3131. a limiting plate; 3132. a connecting plate; 314. a station; 3141. a flat plate; 3142. a cross beam; 3143. a baffle plate; 315. a protective frame; 3151. a lateral guard bar; 3152. a connecting rod; 316. a bottom bracket; 32. an auxiliary ladder; 321. an auxiliary ladder main body; 3211. a boundary beam; 3212. a foot bar; 322. a top roller; 323. a middle roller; 324. turning over the bracket; 3241. a turnover plate; 3242. bending the plate; 3246. turning over the hole; 331. a spacing pin; 3311. rotating the head; 3312. a limiting block; 3313. a limiting rod; 3314. a fixed block; 332. and (6) positioning the bolt.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

The present invention provides a mixer truck 100 that may be used for mixing and transporting concrete. Referring to fig. 1 and 2, the mixer truck 100 generally includes a truck frame 1, a mixing drum 2 rotatably mounted on the truck frame 1, and a ladder climbing device 3 mounted on the truck frame 1. The frame 1 comprises a chassis and a bracket which is fixed on the chassis and supports the rear end of the mixing drum 2.

The embodiment of the invention is mainly optimized for the ladder stand and the connection mode related to the ladder stand, and the related structure of the frame 1 and the mixing drum 2 can refer to the related technology.

The ladder climbing device 3 is installed at a side portion of the rear end of the mixer truck 100 so that a worker can go up and down and perform works such as cleaning, inspection, and maintenance on the top of the mixer truck 100.

With reference to figures 3, 4, 5 and 6, the ladder climbing device 3 comprises a main ladder 31 and an auxiliary ladder 32.

The main ladder 31 includes two support beams 311, a connection beam 312 connected to the bottoms of the two support beams 311, a limit bracket 313, a platform 314, and a protection frame 315.

The two support beams 311 are arranged in parallel at intervals. Specifically, the two support beams 311 are disposed at intervals in the longitudinal direction of the vehicle body frame 1. The upper portion of each support beam 311 is fixedly connected to the top of the bracket and the bottom portion is fixedly connected to the chassis, so that each support beam 311 extends substantially vertically. And the top of each support beam 311 extends upwardly beyond the top of the bracket.

Specifically, the supporting beam 311 includes two wing plates disposed in parallel at an interval and a web plate connecting the two wing plates, the two wing plates are located on the same side of the web plate, and the three are enclosed to form a groove, and the groove forms a track. In this embodiment, the opening of the groove faces the mixing drum 2.

A locking hole 3111 is provided in a middle region of each support beam 311 in the longitudinal direction of the support beam 311. In the present application, the middle region of the support beam 311 does not refer to the center of the support beam 311 in the longitudinal direction, but refers to a region of a certain length range including the center of the support beam 311 in the longitudinal direction, and does not include the end portions of the support beam 311 in the longitudinal direction.

The connection beam 312 includes a bottom plate 3121 and a side plate 3122 connected perpendicularly to each other. The side panel 3122 extends in the longitudinal direction of the vehicle frame 1, is connected between the two support beams 311, and is located on the side surfaces of the two support beams 311. Specifically, the side plate 3122 is located on the side of the support beam 311 close to the mixing drum 2, and is closely attached to both support beams 311. The base plate 3121 is located below the two support beams 311 to support the two support beams 311. In the present embodiment, the connecting beam 312 is L-shaped.

Further, the connecting beam 312 is connected to the chassis by a bottom bracket 316. Specifically, one end of the bottom bracket 316 is fixedly connected to the side plate 3122 of the connecting beam 312, and the other end is fixedly connected to the chassis.

The two position-limiting brackets 313 are disposed on the connecting beam 312, and the two position-limiting brackets 313 correspond to the two supporting beams 311 respectively. Each limit bracket 313 is erected on the bottom plate 3121 of the connection beam 312. And a space is provided between the position limiting bracket 313 and the support beam 311 to accommodate the turning bracket 324.

Specifically, each stopper bracket 313 includes two stopper plates 3131 and a coupling plate 3132 coupling the two stopper plates 3131. The two limit plates 3131 are arranged in parallel at intervals and are fixedly connected to the bottom plate 3121, and the limit plates 3131 extend along the length direction of the frame 1. The connection plate 3132 extends in the width direction of the frame 1, and a limit hole is formed on the connection plate 3132.

The connection plate 3132 and the two limit plates 3131 enclose to form a limit groove for receiving the bottom end of the auxiliary ladder 32 and limiting the movement of the auxiliary ladder 32.

The platform 314 is fixed to the upper portion of the support beam 311, and provides a platform on which workers stand. The platform 314 is disposed on one side of the supporting beam 311 facing the mixing drum 2, so that the worker can move closer to the mixing drum 2, and the worker can work conveniently.

Specifically, the docking station 314 includes a plurality of beams 3142 disposed in parallel and spaced apart, a flat plate 3141 disposed on the beams 3142, and baffles 3143 erected at two ends of the flat plate 3141.

The plurality of cross members 3142 are provided at intervals along the longitudinal direction of the vehicle frame 1. Each cross member 3142 extends in the width direction of the vehicle frame 1.

The two baffles 3143 are spaced apart along the length of the frame 1. Each baffle 3143 extends in the height direction of the vehicle frame 1, i.e., in the vertical direction.

One end of the flat plate 3141 is fixedly connected with the two support beams 311, and the other end is fixedly connected with the bracket; one end of each baffle 3143 is fixedly connected with the two support beams 311, and the other end is fixedly connected with the bracket, thereby realizing the fixed connection of the upper part of the support frame and the bracket.

The protection frame 315 is disposed on the top of the supporting frame, and the protection frame 315 is located above the platform 314, when the worker stands on the platform 314, the protection frame 315 is located on two sides of the worker, so as to protect the worker.

The two protection frames 315 are respectively disposed corresponding to the two support beams 311, that is, when a worker stands on the platform 314, the two protection frames 315 are respectively located at two sides of the worker. Specifically, each protection frame 315 includes two side protection rods 3151 arranged in parallel at intervals and a connecting rod 3152 connecting the two side protection rods 3151, the protection rods are vertically connected with the corresponding support beam 311, the protection rods extend along the width direction of the frame 1, and the connecting rod 3152 extends along the vertical direction. Namely, the guard bar is positioned between the support frame and the mixing drum 2.

The auxiliary ladder 32 comprises an auxiliary ladder main body 321, sliding assemblies symmetrically arranged at two sides of the auxiliary ladder main body 321, and overturning brackets 324 symmetrically arranged at two sides of the main ladder 31.

The auxiliary ladder main body 321 includes two side beams 3211 arranged in parallel at an interval and a plurality of step bars 3212 arranged between the two side beams 3211.

The two side beams 3211 are respectively arranged corresponding to the two limit brackets 313, and the bottom ends of the side beams 3211 can be inserted into the limit grooves of the limit brackets 313.

The middle part of each boundary beam 3211 all is equipped with the locating hole, and the bottom of each boundary beam 3211 all is equipped with spacing hole. Similarly, in the present application, the middle portion of the side member 3211 does not refer to the center of the side member 3211 in the longitudinal direction, but refers to a region of a certain length range including the center of the side member 3211 in the longitudinal direction, and does not include the end portions of the side member 3211 in the longitudinal direction.

Specifically, the side beams 3211 include four side walls that enclose a square tube shape. In this embodiment, two opposite side walls of each side beam 3211 are provided with a positioning hole and a limiting hole. A plurality of stepping rods 3212 are spaced along the length of the side member 3211, so that the worker can climb up and down and can go up to the platform 314 from the ground or go down to the ground from the platform 314.

In this embodiment, the length of the side beams 3211 is less than the length of the support beams 311, so as to prevent the side beams 3211 from separating from the rail when sliding upward.

The glide assembly includes a top roller 322 disposed at the top of the auxiliary ladder main body 321 and a middle roller 323 disposed at the middle of the auxiliary ladder main body 321.

The two top rollers 322 correspond to the tops of the two side beams 3211 of the auxiliary ladder main body 321, respectively. Specifically, each top roller 322 is hingedly connected to the side member 3211 via a latch. The top roller 322 is slidably engaged with the track of the support beam 311, and the two side beams 3211 are located inside the support beam 311. The side facing the area defined by the two support beams 311 is the inner side, and the opposite side is the outer side.

The two middle rollers 323 respectively correspond to the middle regions of the two side beams 3211 of the auxiliary ladder main body 321. Specifically, each middle roller 323 is hinged to the roll-over stand by a pin. And the middle roller 323 is slidably engaged with the rail of the support beam 311.

In this embodiment, the turning bracket 324 is an integral structure, and for the convenience of understanding, the turning bracket 324 is divided into a turning plate 3241 and a bending plate 3242 according to the functional division of the turning bracket 324. Referring to fig. 7 and 8, in the length direction of the turnover plate 3241, two ends of the turnover plate 3241 are respectively provided with turnover holes 3246, and the two turnover holes 3246 are located on the same horizontal line. One of the turning holes 3246 is hinged to the middle roller 323 by a bolt, and the other turning hole 3246 is hinged to the corresponding side beam 3211 by a bolt, so that the turning bracket 324 can be rotated to be horizontally supported between the side beam 3211 and the support beam 311, or rotated to be vertically accommodated between the side beam 3211 and the support beam 311.

In this embodiment, along the length direction of the edge beam 3211, a height difference exists between the connection portion of the turning bracket 324 and the edge beam 3211 and the positioning hole.

The bent plate 3242 is perpendicular to the flap plate 3241, and the bent plate 3242 is formed by bending the flap plate 3241. Specifically, the bent plate 3242 is connected to the middle of the bent plate 3241, and when the turning bracket 324 slides to a horizontal position, the bent plate 3242 is located at the top of the bent plate 3241, the bent plate 3242 abuts against the side beam 3211 of the auxiliary ladder main body 321, and the bent plate 3241 abuts against the bottom plate 3121 of the connecting beam 312.

Further, the turning bracket 324 further includes a transition plate connecting the turning plate 3241 and the bending plate 3242. When the turning bracket 324 is in the horizontal state, the transition plate is located at one end of the turning plate 3241 close to the agitating drum 2. The transition plate is parallel to the flipping plate 3241.

The operation principle of the turning bracket 324 is as follows:

one end of the turning bracket 324 is hinged with the side beam 3211 of the auxiliary ladder 32, the other end is hinged with the middle roller 323, and the middle roller 323 is in sliding fit with the track of the main ladder 31, so that the turning bracket 324 can move along with the sliding of the middle roller 323, and the state of the turning bracket 324 is switched between a horizontal state and a vertical state during moving.

The turning bracket 324 has a certain length, so that when the turning bracket 324 is in a horizontal state, the turning bracket 324 between the main ladder 31 and the auxiliary ladder 32 makes an included angle between the auxiliary ladder 32 and the main ladder 31. In practice, the length of the flip bracket 324 is set according to the desired angle.

The limiting member comprises a limiting pin 331 and a positioning pin 332.

The two positioning pins 332 are respectively disposed corresponding to the two support beams 311. Each positioning pin 332 is inserted into a locking hole 3111 of a support beam 311 and a positioning hole of the side beam 3211 corresponding to the support beam 311 at the same time, so as to position the main ladder 31 and the auxiliary ladder 32.

The number of the stopper pins 331 is one or two. When there is one position-limiting pin 331, it is disposed corresponding to one of the position-limiting brackets 313, and at this time, the connecting plate 3132 and the supporting beam 311 of the position-limiting bracket 313 are respectively located at two ends of the position-limiting plate 3131. The connection plate 3132 and the support beam 311 of the other position-limiting bracket 313 can be respectively located at two ends of the position-limiting plate 3131, and can also be located at the same end of the position-limiting plate 3131.

When there are two limit pins 331, they are respectively disposed corresponding to the two limit brackets 313. At this time, the connection plate 3132 and the support beam 311 of each stopper bracket 313 are located at both ends of the stopper plate 3131.

Referring to fig. 9, in the present embodiment, the stopper pin 331 includes a rotating head 3311, a stopper rod 3313 connected to the rotating head 3311, a stopper 3312 connected between the rotating head 3311 and the stopper rod 3313, and a fixing block 3314.

The cross-section of the rotating head 3311 is circular for convenient rotation.

The stopper 3312 is rectangular and is connected to the rotating head 3311. Specifically, the stopper 3312 has an elongated shape, i.e., a length in a first direction is greater than a length in a second direction in a plane perpendicular to the axial direction of the stopper pin 331.

Specifically, one end of the fixing block 3314 is provided with a positioning groove, which matches with the shape of the position-limiting block 3312, so that the position-limiting block 3312 can be completely accommodated in the positioning groove or located outside the positioning groove and abut against the outer wall of the opening of the positioning groove.

The fixing block 3314 has two nuts at the other end thereof opposite to the stopper groove, and the fixing block 3314 is mounted on the connection plate 3132 of the stopper bracket 313 by the two nuts, that is, the two nuts are respectively located at both sides of the connection plate 3132.

The fixing block 3314 is formed with a through hole extending along the axial direction of the stopper pin 331, and the through hole is communicated with the stopper groove.

The end of the position-limiting rod 3313 is located at one end of the two nuts on the fixing block 3314 and passes through the through-hole to connect with the position-limiting block 3312.

The use method of the limit pin 331 is as follows:

the limit block 3312 is pushed into the limit groove by the rotating head 3311, so that the limit rod 3313 extends out and is inserted into the limit hole at the bottom of the side beam 3211, thereby realizing the limit between the auxiliary ladder 32 and the main ladder 31; the pulling swivel head 3311 makes stopper 3312 withdraw from the spacing groove, then rotates swivel head 331190 degrees, makes stopper 3312 butt spacing groove open-ended outer wall, and at this moment, gag lever post 3313 withdraws from the spacing hole of boundary beam 3211 bottom, and makes vice ladder 32 can upwards slide.

That is, the positioning hole of the auxiliary ladder 32 is connected to the locking hole 3111 of the support beam 311 by the positioning pin 332, and the bottom of the auxiliary ladder 32 is connected to the main ladder 31 by the stopper bracket 313 and the stopper pin 331, thereby connecting and fixing the auxiliary ladder 32 to the main ladder 31.

When the mixer truck 100 needs to be cleaned and repaired, the ladder climbing device 3 in the embodiment is used as follows:

the limit between the bottom of the main ladder 31 and the bottom of the auxiliary ladder 32 is released by the limit releasing pin 331, and the limit between the middle of the main ladder 31 and the middle of the auxiliary ladder 32 is released by the positioning pin 332. The auxiliary ladder 32 is slid upwards, so that the beams 3211 on the two sides of the auxiliary ladder 32 are separated from the limit of the limit bracket 313.

The sub-ladder 32 is pulled outward, i.e., in a direction away from the mixer drum 2, and at this time, the turning bracket 324 is turned from the vertical state to the horizontal state.

The sub-ladder 32 is slid downward until the turning bracket 324 is horizontal, and at this time, the turning plate 3241 abuts against the bottom plate 3121 of the connecting beam 312, and the bent plate 3242 abuts against the side beam 3211 of the sub-ladder 32.

The staff climbs to the platform 314 of the main ladder 31 through the auxiliary ladder 32 to work, and at the work, the protection frame 315 protects the staff, so that the safety of the staff is guaranteed.

After the worker finishes working, the auxiliary ladder 32 is slid upwards until the turning support 324 is in a vertical state, and at the moment, the turning plate 3241 extends vertically and is positioned between the support beam 311 and the side beam 3211.

After the auxiliary ladder 32 is upwards slid to be positioned above the limiting frame, the auxiliary ladder 32 is downwards slid to enable the side beam 3211 of the auxiliary ladder 32 to be positioned in the limiting groove of the limiting bracket 313, and then the main ladder 31 and the auxiliary ladder 32 are limited and locked through the limiting pin 331 and the positioning pin.

When the auxiliary ladder 32 is accommodated in the main ladder 31, the top of the main ladder 31 extends upwards beyond the top of the auxiliary ladder 32, so that the top rollers 322 can slide in the tracks.

The ladder device 3 in this embodiment can reduce the height of the auxiliary ladder 32 from the ground by pulling and sliding the auxiliary ladder 32, and thus it is convenient for the worker to go up the ladder device 3 and work. And the auxiliary ladder 32 is turned over by the turning support 324, so that an included angle is formed between the auxiliary ladder 32 and the main ladder 31, namely the auxiliary ladder 32 is inclined, the ladder climbing device 3 accords with ergonomics, and workers can climb up and down the ladder climbing device 3 more safely and comfortably.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, as follows: it is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of the claims and equivalents thereof.

Claims

1. A cat ladder device of trucd mixer, its characterized in that includes:

the main ladder is fixed at the rear side of the mixer truck; the main ladder comprises two supporting beams arranged in parallel at intervals and a connecting beam connected between the bottoms of the two supporting beams; the two supporting beams are provided with vertically extending rails;

the auxiliary ladder comprises an auxiliary ladder main body, sliding assemblies symmetrically arranged on two sides of the auxiliary ladder main body and overturning supports symmetrically arranged on two sides of the main ladder; the two sliding assemblies are correspondingly matched with the two rails in a sliding manner, so that the auxiliary ladder can slide upwards to be accommodated in the main ladder or extend downwards out of the main ladder; one end of each overturning bracket is hinged with one side of the middle area of the auxiliary ladder main body, and the other end of each overturning bracket is hinged with the corresponding sliding component;

when the sliding component slides upwards, the overturning bracket overturns from a horizontal position to a vertical position, so that the auxiliary ladder slides upwards to be accommodated in the main ladder; when the sliding assembly slides downwards, the overturning support rotates to a horizontal position from a vertical position, so that the auxiliary ladder extends downwards out of the main ladder, and the overturning support is abutted to the connecting beam.

2. The ladder climbing device of the mixer truck as claimed in claim 1, wherein the turning bracket comprises a turning plate and a bending plate which are integrally formed; the two ends of the turnover plate are respectively hinged with the auxiliary ladder main body and the sliding assembly, the bending plate is connected to the middle of the turnover plate, the turnover support slides to be in a horizontal position, the bending plate is located at the top of the turnover plate, the bending plate is abutted to the auxiliary ladder main body, and the bottom of the turnover plate is abutted to the connecting beam.

3. The ladder climbing device of the mixer truck as claimed in claim 1, wherein each support beam comprises two wing plates arranged in parallel at intervals and a web plate connecting the two wing plates, the two wing plates and the web plate enclose to form a groove, and the groove forms the track;

the connecting beam comprises a bottom plate and a side plate perpendicular to the bottom plate, the side plate is fixedly connected with one side of an opening of the groove of the supporting beam, and the bottom plate is located at the bottom of the supporting beam and supports the supporting beam.

4. The ladder climbing device of a mixer truck as set forth in claim 1, wherein the auxiliary ladder body comprises two side beams arranged in parallel at intervals and a plurality of foot bars connected between the two side beams, the plurality of foot bars being arranged at intervals along a longitudinal direction of the side beams;

the main ladder also comprises two limiting brackets arranged on the connecting beam, the two limiting brackets are arranged corresponding to the two supporting beams, and the limiting brackets are positioned on the inner sides of the corresponding supporting beams;

each limiting support is provided with a limiting groove, when the auxiliary ladder is accommodated in the main ladder, the bottom ends of the two side beams are respectively and correspondingly positioned in the limiting grooves, and the auxiliary ladder is limited by simultaneously penetrating through the limiting supports and the side beams through limiting pins.

5. The ladder climbing device for the mixer truck as claimed in claim 4, wherein each of the limiting brackets comprises two limiting plates arranged in parallel at intervals and a connecting plate connecting the two limiting plates, and the two limiting plates and the connecting plate stand on the connecting beam to form a limiting groove in an enclosing manner.

6. The ladder climbing device of the mixer truck as set forth in claim 4, wherein the stopper pin includes a rotating head, a stopper rod connected to the rotating head, a stopper connected between the rotating head and the stopper rod, and a fixing block, the fixing block being provided with a positioning groove and a through hole, the stopper rod being capable of passing through the through hole and being inserted into the stopper bracket and the side beam, the stopper being adapted to the positioning groove so that the stopper can be completely received in the positioning groove or located outside the positioning groove and abutting against the outer wall of the opening of the positioning groove.

7. The ladder climbing device for the mixer truck as claimed in claim 4, wherein the side of the side beam is provided with positioning holes; the side part of the supporting beam is provided with a locking hole corresponding to the positioning hole; when the auxiliary ladder is accommodated in the main ladder, the positioning pin is inserted into the positioning hole and the locking hole at the same time to position the auxiliary ladder.

8. The ladder climbing device of the mixer truck as claimed in claim 1, wherein the sliding assembly includes a top roller disposed at the top of the auxiliary ladder body and a middle roller disposed at the middle of the auxiliary ladder body, and the turning bracket is hinged to the middle roller.

9. The ladder climbing device for mixer trucks as claimed in claim 1, wherein two protection frames of the main ladder are fixed on two sides of the top of the support beam, the platform of the main ladder is fixed in the middle of the support beam, and the protection frames are located above the platform with a height difference.

10. The ladder climbing device of a mixer truck as claimed in claim 9, wherein the platform comprises a plurality of parallel cross beams spaced apart from each other, a plate disposed on the cross beams, and baffles standing on both ends of the plate, the plate connects the two support beams, and the baffles correspond to the two support beams respectively.

11. The ladder climbing device for mixer trucks according to claim 9, wherein two of the protection frames are respectively disposed corresponding to two of the support beams, each of the protection frames includes two parallel side protection rods disposed at intervals and a connecting rod connecting the two side protection rods, the protection rods are perpendicularly connected to the corresponding support beams, the protection rods extend along the width direction of the mixer truck, and the connecting rod extends along the vertical direction.

12. A mixer vehicle, characterised in that it comprises a frame and ladder climbing means according to any of claims 1-11, which are located at the rear side of the mixer vehicle and are fixed to the frame.