Agitating truck and its ladder device

Abstract

The present invention provides a mixer truck and its ladder device. The ladder device includes a main ladder and a sub-ladder. The main ladder includes two support beams arranged in parallel at intervals and a connecting beam connected between the bottoms of the two support beams; vertical tracks are provided on the two support beams; the sub-ladder includes a sub-ladder body, sliding components symmetrically arranged on both sides of the sub-ladder body, and flipping brackets symmetrically arranged on both sides of the main ladder; the two sliding components are slidably matched with the two tracks, so that the sub-ladder can slide upward to be received in the main ladder or extend downward out of the main ladder; one end of each flipping bracket is hingedly connected to one side of the middle area of the sub-ladder body, and the other end is hingedly connected to the corresponding sliding component; when the sliding component slides upward, the flipping bracket flips from the horizontal position to the vertical position, so that the sub-ladder slides upward to be received in the main ladder; when the sliding component slides downward, the flipping bracket rotates from the vertical position to the horizontal position, so that the sub-ladder extends downward out of the main ladder, and the flipping bracket abuts against the connecting beam.

Description

Technical Field

[0001] The present invention relates to the field of transport vehicles, and particularly to a mixer truck and its ladder device. Background Art

[0002] A mixer truck is a special vehicle widely used in the engineering and construction industry for transporting mixed concrete. A ladder is usually provided on the mixer truck for workers to get on and off, so as to carry out work such as flushing, inspection, and maintenance on the top parts of the mixer truck, such as the feeding port and the feeding hopper.

[0003] Currently, the ladder is fixed to the frame of the mixer truck, and its bottom end is usually located at the frame, resulting in a relatively high distance between the bottom of the ladder and the ground, making it time-consuming and laborious for workers to get on and off. Summary of the Invention

[0004] The purpose of the present invention is to provide a mixer truck and its ladder device that are convenient for climbing up and down to solve the problems in the prior art.

[0005] To solve the above technical problems, the present invention provides a ladder device for a mixer truck, including: a main ladder fixed to the rear side of the mixer truck; the main ladder includes two parallel and spaced support beams and a connecting beam connected between the bottoms of the two support beams; vertical tracks are provided on the two support beams; a secondary ladder includes a secondary ladder body, sliding components symmetrically arranged on both sides of the secondary ladder body, and turning brackets symmetrically arranged on both sides of the main ladder; the two sliding components are slidably matched with the two tracks respectively, so that the secondary ladder can slide upward to be received in the main ladder or extend downward out of the main ladder; one end of each turning bracket is hinged to one side of the middle area of the secondary ladder body, and the other end is hinged to the corresponding sliding component; when the sliding component slides upward, the turning bracket turns from a horizontal position to a vertical position, so that the secondary ladder slides upward to be received in the main ladder; when the sliding component slides downward, the turning bracket rotates from a vertical position to a horizontal position, so that the secondary ladder extends downward out of the main ladder, and the turning bracket abuts against the connecting beam.

[0006] In one embodiment, the turning bracket includes an integrally formed turning plate and a bending plate; both ends of the turning plate are respectively hinged to the secondary ladder body and the sliding component, the bending plate is vertically connected to the middle of the turning plate, when the turning bracket slides to a horizontal position, the bending plate is located at the top of the turning plate, and the bending plate abuts against the secondary ladder body, and the bottom of the turning plate abuts against the connecting beam.

[0007] In one embodiment, each of the support beams includes two wing plates arranged in parallel and spaced apart from each other and a web plate connecting the two wing plates. The two wing plates and the web plate enclose a groove, and the groove constitutes the track. The connecting beam includes a bottom plate and a side plate perpendicular to the bottom plate. The side plate is fixedly connected to the opening side of the groove of the support beam, and the bottom plate is located at the bottom of the support beam to support the support beam.

[0008] In one embodiment, the auxiliary ladder body includes two side beams arranged in parallel and spaced apart from each other and tread bars connected between the two side beams. A plurality of tread bars are arranged at intervals along the length direction of the side beams. The main ladder further includes two limiting brackets arranged on the connecting beam. The two limiting brackets are arranged corresponding to the two support beams, and the limiting brackets are located inside the corresponding support beams. Each limiting bracket has a limiting groove. When the auxiliary ladder is received in the main ladder, the bottom ends of the two side beams are respectively located in the limiting grooves, and the auxiliary ladder is restricted by a limiting pin passing through the limiting bracket and the side beam at the same time.

[0009] In one embodiment, each of the limiting brackets includes two limiting plates arranged in parallel and spaced apart from each other and a connecting plate connecting the two limiting plates. The two limiting plates and the connecting plate stand on the connecting beam to enclose a limiting groove.

[0010] In one embodiment, the limiting pin includes a rotating head, a limiting rod connected to the rotating head, a limiting block and a fixing block connected between the rotating head and the limiting rod. The fixing block is provided with a communicating positioning groove and a through hole. The limiting rod can pass through the through hole and insert into the limiting bracket and the side beam. The shape of the limiting block matches that of the positioning groove, so that the limiting block can be completely received in the positioning groove or located outside the positioning groove and abutted against the outer wall of the opening of the positioning groove.

[0011] In one embodiment, a positioning hole is provided on the side of the side beam; a locking hole corresponding to the positioning hole is provided on the side of the support beam; when the auxiliary ladder is received in the main ladder, the auxiliary ladder is positioned by inserting a positioning pin into the positioning hole and the locking hole at the same time.

[0012] In one embodiment, the sliding assembly includes top rollers arranged at the top of the auxiliary ladder body and middle rollers arranged in the middle of the auxiliary ladder body. The turning bracket is hinged to the middle rollers.

[0013] In one embodiment, the two protective frames of the main ladder are fixed on both sides of the top of the support beam, and the platform of the main ladder is fixed in the middle of the support beam. The protective frame is located above the platform, and there is a height difference between the two.

[0014] In one embodiment, the platform includes a plurality of cross beams arranged in parallel at intervals, a flat plate disposed on the cross beams, and baffle plates erected at both ends of the flat plate. The flat plate is connected to the two support beams, and the two baffle plates respectively correspond to the two support beams.

[0015] In one embodiment, the two protective frames are respectively arranged corresponding to the two support beams. Each protective frame includes two side protective rods arranged in parallel at intervals and a connecting rod connecting the two side protective rods. The protective rod is vertically connected to the corresponding support beam. The protective rod extends along the width direction of the mixer truck, and the connecting rod extends vertically.

[0016] The present invention also provides a mixer truck, which includes a vehicle frame and the ladder device as described above. The ladder device is located at the rear side of the mixer truck and is fixed to the vehicle frame.

[0017] As can be seen from the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0018] The ladder device of the present invention includes a main ladder and a sub-ladder. The main ladder is installed at the rear side of the mixer truck, and a vertically extending track is provided on the main ladder. The sub-ladder can slide relative to the track of the main ladder, so that the sub-ladder can slide downward to extend out of the main ladder or slide upward to be received in the main ladder. One end of the flipping bracket of the sub-ladder is hingedly connected to one side of the middle area of the sub-ladder body, and the other end is hingedly connected to the corresponding sliding component. When the sub-ladder slides downward to extend out of the main ladder, the flipping bracket rotates from the vertical position to the horizontal position, and the flipping bracket abuts against the connecting beam of the main ladder. By the downward sliding of the sub-ladder, the sub-ladder extends downward out of the main ladder, reducing the height of the sub-ladder from the ground, which is convenient for the staff to climb the ladder device to work. And when the sub-ladder extends downward out of the main ladder, the flipping bracket is in the horizontal position, so that there is an included angle between the sub-ladder and the main ladder, that is, the sub-ladder is inclined, making the ladder device ergonomic, and the staff is safer and more comfortable when climbing up and down the ladder device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the first direction view of one embodiment of the mixer truck of the present invention;

[0020] Figure 2 is the second direction view of one embodiment of the mixer truck of the present invention;

[0021] Figure 3 is the first direction view of the sub-ladder extending out of the main ladder in the ladder device of the present invention;

[0022] Figure 4 is the second direction view of the sub-ladder extending out of the main ladder in the ladder device of the present invention;

[0023] Figure 5 is the first direction view of the sub-ladder being received in the main ladder in the ladder device of the present invention;

[0024] Figure 6 It is the second direction view of the auxiliary ladder being received in the main ladder in the ladder climbing device of the present invention;

[0025] Figure 7 It is a schematic structural view of one embodiment of the flipping bracket of the present invention;

[0026] Figure 8 It is the first direction view of one embodiment of the flipping bracket of the present invention;

[0027] Figure 9 It is a schematic structural view of the limit pin of the present invention.

[0028] Among them, the reference numerals are explained as follows: 100, concrete mixer truck; 1, vehicle frame; 2, mixing drum; 3, ladder climbing device; 31, main ladder; 311, support beam; 3111, locking hole; 312, connecting beam; 3121, bottom plate; 3122, side plate; 313, limit bracket; 3131, limit plate; 3132, connecting plate; 314, platform; 3141, flat plate; 3142, cross beam; 3143, baffle; 315, protective frame; 3151, side protective rod; 3152, connecting rod; 316, bottom bracket; 32, auxiliary ladder; 321, auxiliary ladder main body; 3211, side beam; 3212, tread bar; 322, top roller; 323, middle roller; 324, flipping bracket; 3241, flipping plate; 3242, bending plate; 3246, flipping hole; 331, limit pin; 3311, rotating head; 3312, limit block; 3313, limit rod; 3314, fixing block; 332, positioning pin. Detailed Embodiments

[0029] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and not for limiting the present invention.

[0030] To further illustrate the principle and structure of the present invention, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] The present invention provides a concrete mixer truck 100, which can be used for mixing and transporting concrete. Refer to Figure 1 and Figure 2 , the concrete mixer truck 100 generally includes a vehicle frame 1, a mixing drum 2 rotatably mounted on the vehicle frame 1, and a ladder climbing device 3 mounted on the vehicle frame 1. Among them, the vehicle frame 1 includes a chassis and a bracket fixed to the chassis and supporting the rear end of the mixing drum 2.

[0032] The embodiments of the present invention mainly optimize the ladder and its related connection methods, and the related structures of the vehicle frame 1 and the mixing drum 2 can refer to the related technologies.

[0033] The ladder device 3 is installed on the side of the rear end of the mixer truck 100 for the staff to get on and off, and to perform operations such as cleaning, inspection, and maintenance on the top of the mixer truck 100.

[0034] Combined with Figure 3 、 Figure 4 、 Figure 5 and Figure 6 the ladder device 3 includes a main ladder 31 and a sub-ladder 32.

[0035] The main ladder 31 includes two support beams 311, a connecting beam 312 connected to the bottoms of the two support beams 311, a limit bracket 313, a platform 314, and a protective frame 315.

[0036] The two support beams 311 are arranged in parallel at intervals. Specifically, the two support beams 311 are arranged at intervals along the length direction of the vehicle frame 1. The upper parts of the respective support beams 311 are fixedly connected to the top of the bracket, and the bottoms are fixedly connected to the chassis, so that the respective support beams 311 extend substantially vertically. And the tops of the respective support beams 311 extend upward beyond the top of the bracket.

[0037] Specifically, the support beam 311 includes two wing plates arranged in parallel at intervals and a web connecting the two wing plates. The two wing plates are on the same side of the web, and the three enclose to form a groove, and this groove constitutes a track. In this embodiment, the opening of this groove faces the mixing drum 2.

[0038] Along the length direction of the support beam 311, a locking hole 3111 is provided in the middle area of each support beam 311. In this application, the middle area of the support beam 311 does not specifically refer to the exact center position along the length direction of the support beam 311, but refers to an area within a certain length range including the exact center position along the length direction of the support beam 311, excluding the two ends of the support beam 311 along the length direction.

[0039] The connecting beam 312 includes a bottom plate 3121 and a side plate 3122 connected perpendicularly to each other. The side plate 3122 extends along the length direction of the vehicle frame 1 and is connected between the two support beams 311 and is located on the side 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 in close contact with the two support beams 311. The bottom plate 3121 is located below the two support beams 311 to support the two support beams 311. Specifically, in this embodiment, the connecting beam 312 is in an L shape.

[0040] Furthermore, the connecting beam 312 is connected to the chassis through 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.

[0041] Both limiting brackets 313 are arranged on the connecting beam 312, and the two limiting brackets 313 respectively correspond to the two support beams 311. Each limiting bracket 313 stands upright on the bottom plate 3121 of the connecting beam 312. And there is a gap between the limiting bracket 313 and the support beam 311 to accommodate the flipping bracket 324.

[0042] Specifically, each limiting bracket 313 includes two limiting plates 3131 and a connecting plate 3132 connecting the two limiting plates 3131. The two limiting plates 3131 are arranged in parallel at intervals and are fixedly connected to the bottom plate 3121, and the limiting plates 3131 extend along the length direction of the vehicle frame 1. The connecting plate 3132 extends along the width direction of the vehicle frame 1, and a limiting hole is provided on the connecting plate 3132.

[0043] The connecting plate 3132 and the two limiting plates 3131 enclose a limiting groove, which is used to accommodate the bottom end of the auxiliary ladder 32 and restrict the movement of the auxiliary ladder 32.

[0044] The platform 314 is fixed to the upper part of the support beam 311, providing a platform for the staff to stand on. The platform 314 is arranged on the side of the support beam 311 facing the mixing drum 2, making the staff closer to the mixing drum 2 and facilitating the staff to work.

[0045] Specifically, the platform 314 includes a plurality of cross beams 3142 arranged in parallel at intervals, a flat plate 3141 arranged on the cross beams 3142, and baffles 3143 erected at both ends of the flat plate 3141.

[0046] The plurality of cross beams 3142 are arranged at intervals along the length direction of the vehicle frame 1. Each cross beam 3142 extends along the width direction of the vehicle frame 1.

[0047] The two baffles 3143 are arranged at intervals along the length direction of the vehicle frame 1. Each baffle 3143 extends along the height direction of the vehicle frame 1, that is, extends vertically.

[0048] One end of the flat plate 3141 is fixedly connected to the two support beams 311, and the other end is fixedly connected to the bracket; one end of each baffle 3143 is fixedly connected to the two support beams 311, and the other end is fixedly connected to the bracket, thereby realizing the fixed connection between the upper part of the support frame and the bracket.

[0049] The protective frame 315 is arranged on the top of the support frame, and the protective frame 315 is located above the platform 314. When the staff stands on the platform 314, the protective frame 315 is located on both sides of the staff to protect the staff.

[0050] The two protection frames 315 are respectively arranged corresponding to the two support beams 311, that is, when the staff stands on the platform 314, the two protection frames 315 are respectively located on both sides of the staff. Specifically, each protection frame 315 includes two parallel and spaced side protection rods 3151 and a connecting rod 3152 connecting the two side protection rods 3151, the protection rod is vertically connected to the corresponding support beam 311, the protection rod extends along the width direction of the frame 1, and the connecting rod 3152 extends vertically. That is, the protection rod is located between the support frame and the mixing drum 2.

[0051] The auxiliary ladder 32 includes an auxiliary ladder body 321 , sliding components symmetrically arranged on both sides of the auxiliary ladder body 321 , and flip brackets 324 symmetrically arranged on both sides of the main ladder 31 .

[0052] The auxiliary ladder body 321 includes two side beams 3211 arranged in parallel and spaced apart from each other and a plurality of pedals 3212 arranged between the two side beams 3211 .

[0053] The two side beams 3211 are respectively arranged corresponding to the two limiting brackets 313 , and the bottom ends of the side beams 3211 can be inserted into the limiting grooves of the limiting brackets 313 .

[0054] A positioning hole is provided in the middle of each side beam 3211, and a limiting hole is provided at the bottom of each side beam 3211. Similarly, in the present application, the middle of the side beam 3211 does not specifically refer to the exact center position of the side beam 3211 along the length direction, but refers to an area within a certain length range including the exact center position of the side beam 3211 along the length direction, excluding the ends of the side beam 3211 along the length direction.

[0055] Specifically, the side beam 3211 includes four side walls, which are enclosed to form a square tube. In this embodiment, the two opposite side walls of each side beam 3211 are provided with positioning holes and limit holes. A plurality of pedals 3212 are arranged at intervals along the length direction of the side beam 3211, so that the staff can crawl up and down, and can go from the ground to the platform 314 or from the platform 314 to the ground.

[0056] In this embodiment, the length of the side beam 3211 is smaller than the length of the support beam 311, so as to prevent the side beam 3211 from falling off the track when sliding upward.

[0057] The sliding assembly includes a top roller 322 disposed at the top of the auxiliary ladder body 321 and a middle roller 323 disposed at the middle of the auxiliary ladder body 321 .

[0058] The two top rollers 322 respectively correspond to the tops of the two side beams 3211 of the auxiliary ladder main body 321. Specifically, each top roller 322 is hingedly connected to the side beam 3211 through a pin. The top roller 322 is in sliding fit with the track of the support beam 311, and the two side beams 3211 are located inside the support beam 311. Among them, the side facing the area defined by the two support beams 311 is the inner side, and the opposite side is the outer side.

[0059] 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 hingedly connected to the turnover frame through a pin. And the middle roller 323 is in sliding fit with the track of the support beam 311.

[0060] In this embodiment, the turnover bracket 324 is an integral structure. For the convenience of understanding, the turnover bracket 324 is divided into a turnover plate 3241 and a bending plate 3242 according to the functional partition of the turnover bracket 324. Refer to Figure 7 and Figure 8 , along the length direction of the turnover plate 3241, turnover holes 3246 are respectively formed at both ends of the turnover plate 3241, and the two turnover holes 3246 are located on the same horizontal line. One of the turnover holes 3246 is hingedly connected to the middle roller 323 through a pin, and the other turnover hole 3246 is hingedly connected to the corresponding side beam 3211 through a pin, so that the turnover bracket 324 can be rotated to a horizontal state and supported between the side beam 3211 and the support beam 311, or rotated to a vertical state and received between the side beam 3211 and the support beam 311.

[0061] In this embodiment, along the length direction of the side beam 3211, there is a height difference between the connection part of the turnover bracket 324 and the side beam 3211 and the positioning hole.

[0062] The bending plate 3242 is perpendicular to the turnover plate 3241, and the bending plate 3242 is bent from the turnover plate 3241. Specifically, the bending plate 3242 is connected to the middle of the turnover plate 3241. When the turnover bracket 324 slides to the horizontal position, the bending plate 3242 is located at the top of the turnover plate 3241, and the bending plate 3242 abuts against the side beam 3211 of the auxiliary ladder main body 321, and the turnover plate 3241 abuts against the bottom plate 3121 of the connecting beam 312.

[0063] Furthermore, the turnover bracket 324 further includes a transition plate connecting the turnover plate 3241 and the bending plate 3242. When the turnover bracket 324 is in the horizontal state, the transition plate is located at one end of the turnover plate 3241 close to the mixing drum 2. The transition plate is parallel to the turnover plate 3241.

[0064] The working principle of the turnover bracket 324:

[0065] One end of the flipping bracket 324 is hingedly connected to the side beam 3211 of the auxiliary ladder 32, and the other end is hingedly connected to the middle roller 323. The middle roller 323 is in sliding fit with the track of the main ladder 31. Therefore, the flipping bracket 324 can move along with the sliding of the middle roller 323, and the state of the flipping bracket 324 switches between the horizontal state and the vertical state during the movement.

[0066] The flipping bracket 324 has a certain length. Therefore, when the flipping bracket 324 is in the horizontal state, the flipping bracket 324 located between the main ladder 31 and the auxiliary ladder 32 forms a certain angle between the auxiliary ladder 32 and the main ladder 31. In practice, the length of the flipping bracket 324 is set according to the required angle.

[0067] The limiting member includes a limiting pin 331 and a positioning pin 332.

[0068] The two positioning pins 332 are respectively arranged corresponding to the two support beams 311. Each positioning pin 332 is inserted into the locking hole 3111 on a support beam 311 and the positioning hole on the side beam 3211 corresponding to the support beam 311 at the same time, so as to realize the positioning between the main ladder 31 and the auxiliary ladder 32.

[0069] The number of the limiting pins 331 is one or two. When there is one limiting pin 331, it is arranged corresponding to one of the limiting brackets 313. At this time, the connecting plate 3132 of the limiting bracket 313 and the support beam 311 are respectively located at both ends of the limiting plate 3131. And the connecting plate 3132 of the other limiting bracket 313 and the support beam 311 can be respectively located at both ends of the limiting plate 3131, or can be located at the same end of the limiting plate 3131 at the same time.

[0070] When there are two limiting pins 331, they are respectively arranged corresponding to the two limiting brackets 313. At this time, the connecting plates 3132 of each limiting bracket 313 and the support beam 311 are respectively located at both ends of the limiting plate 3131.

[0071] Refer to Figure 9 , in this embodiment, the limiting pin 331 includes a rotating head 3311, a limiting rod 3313 connected to the rotating head 3311, a limiting block 3312 connected between the rotating head 3311 and the limiting rod 3313, and a fixing block 3314.

[0072] The cross section of the rotating head 3311 is circular, which is convenient for rotation.

[0073] The limiting block 3312 is rectangular and is perpendicularly connected to the rotating head 3311. Specifically, the limiting block 3312 is slender, that is, in the plane perpendicular to the axis of the limiting pin 331, the length in the first direction is greater than the length in the second direction.

[0074] Specifically, a positioning groove is formed at one end of the fixed block 3314, and the shape of the positioning groove matches that of the limiting block 3312, so that the limiting block 3312 can be completely received in the positioning groove or located outside the positioning groove and abutted against the outer wall of the opening of the positioning groove.

[0075] Two nuts are provided at the other end of the fixed block 3314 relative to the limiting groove, and the fixed block 3314 is mounted on the connecting plate 3132 of the limiting bracket 313 through the two nuts, that is, the two nuts are respectively located on both sides of the connecting plate 3132.

[0076] A through hole is formed in the fixed block 3314, and the through hole extends along the axial direction of the limiting pin 331 and communicates with the limiting groove.

[0077] The end of the limiting rod 3313 is located at one end of the two nuts on the fixed block 3314 and passes through the through hole to be connected to the limiting block 3312.

[0078] Usage method of the limiting pin 331:

[0079] Push the limiting block 3312 into the limiting groove through the rotating head 3311, so that the limiting rod 3313 extends out and is inserted into the limiting hole at the bottom of the side beam 3211, thereby realizing the limitation between the auxiliary ladder 32 and the main ladder 31; pull the rotating head 3311 to make the limiting block 3312 withdraw from the limiting groove, and then rotate the rotating head 3311 by 90 degrees to make the limiting block 3312 abut against the outer wall of the opening of the limiting groove. At this time, the limiting rod 3313 withdraws from the limiting hole at the bottom of the side beam 3211, so that the auxiliary ladder 32 can slide upward.

[0080] That is, the positioning hole of the auxiliary ladder 32 and the locking hole 3111 of the support beam 311 are connected by a positioning pin 332, and the bottom of the auxiliary ladder 32 and the main ladder 31 are connected through the limiting bracket 313 and the limiting pin 331, thereby realizing the connection and fixation between the auxiliary ladder 32 and the main ladder 31.

[0081] When cleaning, overhauling and other operations need to be carried out on the mixer truck 100, the usage method of the ladder device 3 in this embodiment is as follows:

[0082] Release the limitation between the bottom of the main ladder 31 and the bottom of the auxiliary ladder 32 by the limiting pin 331, and release the limitation between the middle of the main ladder 31 and the middle of the auxiliary ladder 32 by the positioning pin 332. Slide the auxiliary ladder 32 upward so that the two side beams 3211 of the auxiliary ladder 32 are disengaged from the limitation of the limiting bracket 313.

[0083] Pull the auxiliary ladder 32 outward, that is, pull it in the direction away from the mixing drum 2. At this time, the flipping bracket 324 flips from the vertical state to the horizontal state.

[0084] Slide the auxiliary ladder 32 downward until the flipping bracket 324 is in a horizontal state. At this time, the flipping plate 3241 abuts against the bottom plate 3121 of the connecting beam 312, and the bending plate 3242 abuts against the side beam 3211 of the auxiliary ladder 32.

[0085] The staff climbs onto the platform 314 of the main ladder 31 through the auxiliary ladder 32 to work. During the work, the protective frame 315 protects the staff, ensuring the safety of the staff.

[0086] After the staff finishes the work, slide the auxiliary ladder 32 upward until the flipping bracket 324 is in a vertical state. At this time, the flipping plate 3241 extends vertically and is located between the support beam 311 and the side beam 3211.

[0087] After sliding the auxiliary ladder 32 upward to be above the limit frame, then slide the auxiliary ladder 32 downward so that the side beam 3211 of the auxiliary ladder 32 is located in the limit groove of the limit bracket 313, and then limit and lock the main ladder 31 and the auxiliary ladder 32 through the limit pin 331 and the positioning pin.

[0088] When the auxiliary ladder 32 is housed in the main ladder 31, the top of the main ladder 31 extends upward beyond the top of the auxiliary ladder 32 to ensure that the top roller 322 slides in the track.

[0089] In the ladder climbing device 3 of this embodiment, by pulling and sliding the auxiliary ladder 32, the height of the auxiliary ladder 32 from the ground can be reduced, facilitating the staff to climb onto the ladder climbing device 3 for work. And through the flipping of the flipping bracket 324 of the auxiliary ladder 32, an angle is formed between the auxiliary ladder 32 and the main ladder 31, that is, the auxiliary ladder 32 is inclined, making the ladder climbing device 3 conform to ergonomics, and the staff is safer and more comfortable when climbing up and down the ladder climbing device.

[0090] As can be seen from the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0091] The ladder climbing device of the present invention includes a main ladder and an auxiliary ladder. The main ladder is installed at the rear side of the mixer truck, and a vertically extending track is provided on the main ladder. The auxiliary ladder can slide relative to the track of the main ladder, so that the auxiliary ladder can slide downward to extend out of the main ladder or slide upward to be housed in the main ladder. One end of the flipping bracket of the auxiliary ladder is hinged to one side of the middle area of the auxiliary ladder body, and the other end is hinged to the corresponding sliding component. When the auxiliary ladder slides downward to extend out of the main ladder, the flipping bracket rotates from the vertical position to the horizontal position, and the flipping bracket abuts against the connecting beam of the main ladder. By sliding the auxiliary ladder downward, the auxiliary ladder extends downward out of the main ladder, reducing the height of the auxiliary ladder from the ground, facilitating the staff to climb onto the ladder climbing device for work. And when the auxiliary ladder extends downward out of the main ladder, the flipping bracket is in a horizontal position, forming an angle between the auxiliary ladder and the main ladder, that is, the auxiliary ladder is inclined, making the ladder climbing device conform to ergonomics, and the staff is safer and more comfortable when climbing up and down the ladder climbing device.

[0092] While the invention has been described with reference to several exemplary embodiments, it is to be understood that the terms used are descriptive and exemplary rather than restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but rather should be broadly construed within the spirit and scope defined by the appended claims, such that all variations and modifications falling within the scope of the claims or their equivalents are to be covered by the appended claims.

Claims

1. A ladder device for a mixer truck, characterized in that, Comprising: A main ladder, fixed to the rear side of the mixer truck; the main ladder includes two support beams arranged in parallel at intervals and a connecting beam connected between the bottoms of the two support beams; vertical tracks are provided on the two support beams; A sub-ladder, including a sub-ladder main body, sliding components symmetrically arranged on both sides of the sub-ladder main body, and turning brackets symmetrically arranged on both sides of the main ladder; the two sliding components are in sliding fit with the two tracks correspondingly, so that the sub-ladder can slide upward to be received in the main ladder or extend downward out of the main ladder; one end of each turning bracket is hinged to one side of the middle area of the sub-ladder main body, and the other end is hinged to the corresponding sliding component; When the sliding component slides upward, the turning bracket turns from a horizontal position to a vertical position, so that the sub-ladder slides upward to be received in the main ladder; when the sliding component slides downward, the turning bracket rotates from a vertical position to a horizontal position, so that the sub-ladder extends downward out of the main ladder, and the turning bracket abuts against the connecting beam; The turning bracket includes an integrally formed turning plate and a bending plate; the bending plate is perpendicular to the turning plate, the two ends of the turning plate are respectively hinged to the sub-ladder main body and the sliding component, the bending plate is connected to the middle of the turning plate, when the turning bracket slides to a horizontal position, the bending plate is located at the top of the turning plate, and the bending plate abuts against the sub-ladder main body, and the bottom of the turning plate abuts against the connecting beam.

2. The ladder device of a mixer truck according to claim 1, characterized in that, Each support beam includes two wing plates arranged in parallel at intervals and a web plate connecting the two wing plates, and the two wing plates and the web plate enclose a groove, and the groove constitutes the track; The connecting beam includes a bottom plate and a side plate perpendicular to the bottom plate, the side plate is fixedly connected to the opening side of the groove of the support beam, and the bottom plate is located at the bottom of the support beam to support the support beam.

3. The ladder device of a mixer truck according to claim 1, characterized in that, The sub-ladder main body includes two side beams arranged in parallel at intervals and tread bars connected between the two side beams, and a plurality of tread bars are arranged at intervals along the length direction of the side beams; The main ladder further includes two limit brackets arranged on the connecting beam, the two limit brackets are arranged corresponding to the two support beams, and the limit brackets are located inside the corresponding support beams; Each limit bracket has a limit groove, when the sub-ladder is received in the main ladder, the bottom ends of the two side beams are respectively located in the limit grooves, and the sub-ladder is restricted by a limit pin passing through the limit bracket and the side beam at the same time.

4. The ladder device of a mixer truck according to claim 3, characterized in that, Each limit bracket includes two limit plates arranged in parallel at intervals and a connecting plate connecting the two limit plates, and the two limit plates and the connecting plate stand on the connecting beam to enclose a limit groove.

5. The ladder device of a mixer truck according to claim 3, characterized in that, The limit pin includes a rotating head, a limit rod connected to the rotating head, a limit block and a fixing block connected between the rotating head and the limit rod. The fixing block is provided with a communicating positioning groove and through hole. The limit rod can pass through the through hole and insert into the limit bracket and the side beam. The shape of the limit block matches that of the positioning groove, so that the limit block can be completely received in the positioning groove or located outside the positioning groove and abutted against the outer wall of the opening of the positioning groove.

6. The ladder device of a mixer truck according to claim 3, characterized in that, The side part of the side beam is provided with a positioning hole; the side part of the support beam is provided with a locking hole corresponding to the positioning hole; when the auxiliary ladder is received in the main ladder, the auxiliary ladder is positioned by inserting a positioning pin into the positioning hole and the locking hole at the same time.

7. The ladder device of a mixer truck according to claim 1, characterized in that, The sliding assembly includes a top roller provided at the top of the auxiliary ladder main body and a middle roller provided at the middle of the auxiliary ladder main body. The flipping bracket is hinged to the middle roller.

8. The ladder device of a mixer truck according to claim 1, characterized in that, The two protective frames of the main ladder are fixed on both sides of the top of the support beam, and the platform of the main ladder is fixed in the middle of the support beam. The protective frame is located above the platform, and there is a height difference between the two.

9. The ladder device of a mixer truck according to claim 8, characterized in that, The platform includes a plurality of cross beams arranged in parallel at intervals, a flat plate arranged on the cross beams, and baffles erected at both ends of the flat plate. The flat plate is connected to the two support beams, and the two baffles respectively correspond to the two support beams.

10. The ladder device of a mixer truck according to claim 8, characterized in that, The two protective frames are respectively arranged corresponding to the two support beams. Each protective frame includes two side protective rods arranged in parallel at intervals and a connecting rod connecting the two side protective rods. The protective rod is vertically connected to the corresponding support beam. The protective rod extends along the width direction of the mixer truck, and the connecting rod extends vertically.

11. A mixer truck, characterized in that, It includes a vehicle frame and a ladder device as described in any one of claims 1-10. The ladder device is located at the rear side of the mixer truck and is fixed on the vehicle frame.

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