Locking device for mixer truck, locking device design method and mixer truck

Abstract

The invention discloses a locking device for a mixer truck, a locking device design method and the mixer truck, the locking device comprises a limiting piece and a locking assembly, the limiting piece is arranged on a mixing drum of the mixer truck, the locking assembly comprises a mounting seat and a locking buckle, the mounting seat is arranged on a rear platform of the mixer truck, and the locking buckle is arranged on the mounting seat. The locking buckle is rotatably arranged on the mounting seat and can be switched between the locking position and the unlocking position, the locking buckle is used for being matched with the limiting piece to limit rotation of the mixing drum under the condition that the locking buckle is switched to the locking position and releasing limitation on the mixing drum under the condition that the locking buckle is switched to the unlocking position, the rotation stopping reliability of the mixing drum is high, and the service life of the mixing drum is prolonged. The locking buckle is matched with the limiting piece to lock the mixing drum, and the locking buckle cannot shield the limiting piece, so that an operator can conveniently observe the position of the limiting piece, the locking difficulty is reduced, and the locking convenience is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mixer trucks, and in particular relates to a locking device for a mixer truck, a locking device design method, and a mixer truck. Background Art

[0002] After a concrete mixer truck completes a mixing operation, concrete often accumulates in the mixing drum, requiring an operator to enter the stalled drum to manually inspect and clean the accumulated concrete. The drum is typically stalled by stalling the reducer when the truck is turned off, allowing the drum to continue rotating without getting stuck, posing a safety hazard. To address this issue, Chinese invention patent publication number CN103302746A proposes a locking device that uses a pin to engage a locking hole to lock the drum. However, the locking hole is easily obstructed by the pin or other components during use, placing the locking hole in the operator's blind spot. This makes alignment and locking difficult, and the locking operation inconvenient. Summary of the Invention

[0003] In response to the above-mentioned defects or shortcomings, the present invention provides a locking device for a mixer truck, a locking device design method and a mixer truck, aiming to solve the technical problems of difficulty in aligning and locking the mixer drum and inconvenient locking operation.

[0004] In order to achieve the above-mentioned object, the present invention provides a locking device for a mixer truck, the locking device for a mixer truck comprising:

[0005] A limiter is provided on the mixing drum of the mixer truck;

[0006] The locking assembly includes a mounting base and a locking buckle. The mounting base is arranged on the rear end of the mixer truck. The locking buckle is swingably arranged on the mounting base and can be switched between an unlocked position and a locked position. The locking buckle is used to cooperate with the limit piece to limit the rotation of the mixer drum when switched to the locked position, and to release the restriction on the mixer drum when switched to the unlocked position.

[0007] In an embodiment of the present invention, a limit member is arranged on the end face of the track body of the mixing drum, and the limit member extends from the track body toward the locking buckle. The limit member includes two limit blocks, the two limit blocks are arranged at intervals, and a stop groove is formed between the two limit blocks. When the locking buckle is switched to the locking position, it swings to be located in the stop groove.

[0008] In an embodiment of the present invention, the locking buckle includes a support plate and two limiting arms. The two limiting arms are respectively rotatably arranged on the mounting seat, and the two limiting arms are respectively arranged in one-to-one correspondence with the two limiting blocks, and the support plate is connected between the two limiting arms.

[0009] In an embodiment of the present invention, the limiting arm includes a swinging section and a limiting section, one end of the swinging section is swingably arranged on the mounting seat, the other end of the swinging section is connected to the limiting section, and the limiting section is bent from the swinging section toward the limiting block.

[0010] In an embodiment of the present invention, the mounting seat includes a base plate, a mounting plate and a rotating shaft. The base plate is arranged on the rear stage, the mounting plate is arranged on the base plate, and the rotating shaft passes through the mounting plate and the swing section.

[0011] In an embodiment of the present invention, the locking assembly further includes a first positioning identification structure and a second positioning identification structure, the first positioning identification structure being provided on the locking buckle, and the second positioning identification structure being provided in the anti-rotation groove;

[0012] And / or, the locking assembly further comprises an auxiliary alignment block, which is rotatably arranged on the mounting seat and is used to swing to the side of the limit block facing away from the anti-rotation groove.

[0013] In an embodiment of the present invention, there are multiple limiting members, and the multiple limiting members are circumferentially spaced apart and arranged on the mixing drum.

[0014] In an embodiment of the present invention, the locking assembly also includes a limiting elastic member, one end of the limiting elastic member is connected to the mounting seat, and the other end of the limiting elastic member is connected to the locking buckle. The limiting elastic member is used to limit the swinging of the locking buckle when the locking buckle is switched to a locked position or an unlocked position.

[0015] In an embodiment of the present invention, the locking assembly further includes a handle, which is arranged on a side of the locking buckle facing away from the limiting member.

[0016] In an embodiment of the present invention, the locking assembly further comprises a fastener, which is disposed on the mounting seat and is configured to connect with the locking buckle when the locking buckle is switched to the unlocked position;

[0017] And / or, the locking assembly further includes a limit plate, which is provided on the mounting seat, and the locking buckle abuts against the limit plate when switched to the unlocked position.

[0018] In order to achieve the above-mentioned object, the present invention further provides a locking device design method. The locking device design method is used for the locking device for a mixer truck described above. The locking buckle has an abutment area, which is used to abut with the limiter. The allowable stress of the locking buckle and the area of the abutment area satisfy the first strength design formula. The first strength design formula is set as: Where σ is the allowable stress of the locking buckle, S is the area of the abutment zone, ρ is the density of the accumulated material in the mixing drum, V is the preset accumulated material volume in the mixing drum, g is the gravity coefficient, D is the diameter of the mixing drum, and d is the distance between the stopper and the center axis of the mixing drum.

[0019] In an embodiment of the present invention, the self-locking limiting force generated by the locking assembly when the locking buckle is switched to the unlocked position satisfies the second strength design formula, which is set to:

[0020] Where, F1 is the self-locking limit force; τ m1 Δτ is the moment when the locking buckle is switched to the unlocked position and the weight of the locking buckle acts on the hinge point, where the hinge point is the connection point between the locking buckle and the mounting seat; s1 is the torque of the self-locking elastic force of the limiting elastic member acting on the hinge point, and the two ends of the limiting elastic member are respectively connected to the mounting seat and the locking buckle; l is the distance between the handle provided on the locking buckle and the hinge point;

[0021] And / or, the locking limiting force generated by the locking assembly when the locking buckle is switched to the locked position satisfies a third strength design formula, which is set to:

[0022] Where, F2 is the locking limit force; τ m2 Δτ is the moment when the locking buckle is switched to the locked position and the weight of the locking buckle acts on the hinge point, where the hinge point is the connection point between the locking buckle and the mounting seat; s2 The torque of the locking elastic force of the limiting elastic member acting on the hinge point, the two ends of the limiting elastic member are respectively connected to the mounting seat and the locking buckle; l is the distance between the handle provided on the locking buckle and the hinge point.

[0023] In order to achieve the above-mentioned object, the present invention further provides a mixer truck, which includes the locking device for the mixer truck described above.

[0024] Through the above technical solution, the locking device for a mixer truck, the locking device design method, and the mixer truck provided by the embodiments of the present invention have the following beneficial effects:

[0025] In the technical solution of the present invention, the limit member is provided on the mixing drum and can rotate with the mixing drum, the mounting seat is provided on the rear stage, the locking buckle is provided on the mounting seat and can swing from an unlocking position away from the limit member to a locking position toward a direction close to the limit member, and the locking buckle is located on one side of the limit member when it swings to the locking position, so that the locking buckle can be abutted against the limit member when the mixing drum drives the limit member to rotate, thereby limiting the self-rotation of the mixing drum. The mixing drum has high rotation reliability and improves operation safety. The locking buckle cooperates with the limit member to lock the mixing drum. The locking buckle will not block the limit member, which is convenient for the operator to observe the position of the limit member, reduces the difficulty of locking, and improves the convenience of locking.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the accompanying drawings:

[0028] Figure 1 is a schematic diagram of a partial structure of a mixer truck according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A magnified schematic diagram of area A in the middle;

[0030] Figure 3 is a schematic structural diagram of a locking device according to an embodiment of the present invention at one viewing angle;

[0031] Figure 4 is a schematic structural diagram of a locking device according to an embodiment of the present invention from another perspective;

[0032] Figure 5 is a structural schematic diagram of a locking device according to an embodiment of the present invention, in which a locking buckle is switched to an unlocked position;

[0033] Figure 6 is a structural schematic diagram of a locking buckle in a locking device according to an embodiment of the present invention being switched to a locking position;

[0034] Figure 7 2 is a schematic plan view of the structure of a locking device according to an embodiment of the present invention.

[0035] Description of Reference Numerals

[0036] 10 Limiting member 223 contact area

[0037] 11 limit block 23 limit elastic part

[0038] 12 Anti-rotation groove 24 Auxiliary alignment block

[0039] 20 Locking assembly 25 Handle

[0040] 21 Mounting seat 26 Fastener

[0041] 211 bottom plate 27 limit plate

[0042] 212 Mounting plate 200 Mixing drum

[0043] 213 shaft 201 cylinder

[0044] 22 Locking buckle 202 Track body

[0045] 221 support plate 2021 end face

[0046] 222 Limiting Arm 300 Backstage

[0047] 2221 Swing Section 301 Support Wheel

[0048] 2222 limit section DETAILED DESCRIPTION

[0049] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0050] The locking device for a mixer truck of the present invention will be described below with reference to the accompanying drawings.

[0051] like Figures 1 to 4 As shown, the present invention provides a locking device for a mixer truck, which includes a limit member 10 and a locking assembly 20. The limit member 10 is arranged on the mixing drum 200 of the mixer truck, and the locking assembly 20 includes a mounting seat 21 and a locking buckle 22. The mounting seat 21 is arranged on the back end 300 of the mixer truck, and the locking buckle 22 is swingably arranged on the mounting seat 21 and can be switched between a locked position and an unlocked position. The locking buckle 22 is used to cooperate with the limit member 10 to limit the rotation of the mixing drum 200 when switching to the locked position, and to release the restriction on the mixing drum 200 when switching to the unlocked position.

[0052] It should be noted that the locking device of the present invention can be applied to concrete mixer trucks, mixing material pump trucks or other mixer trucks with a mixing drum 200. The present invention does not limit the type of mixer truck. The embodiment of the present invention only takes the mixer truck as a concrete mixer truck as an example for explanation, wherein the concrete mixer truck includes a mixing drum 200 and a backstage 300. The mixing drum 200 is rotatably arranged on the backstage 300 with its own central axis as the rotation center. The mixing drum 200 is used to hold the mixing material, and the mixing material is set to concrete. The locking device is used to limit the rotation of the mixing drum 200.

[0053] Specifically, the limit member 10 is provided on the mixing drum 200 and can rotate with the mixing drum 200. The mounting seat 21 is provided on the back stage 300. The locking buckle 22 is provided on the mounting seat 21 and can swing from an unlocked position away from the limit member 10 to a locked position toward a direction close to the limit member 10. When the locking buckle 22 swings to the locked position, it is located on one side of the limit member 10, so that the locking buckle 22 can be against the limit member 10 when the mixing drum 200 drives the limit member 10 to rotate, thereby limiting the rotation of the mixing drum 200. The mixing drum 200 has high reliability in stopping rotation, which improves operational safety. The locking buckle 22 cooperates with the limit member 10 to lock the mixing drum 200. The locking buckle 22 will not block the limit member 10, which is convenient for the operator to observe the position of the limit member 10, reduces the difficulty of locking, and improves the convenience of locking.

[0054] In an embodiment of the present invention, the limit member 10 is arranged on the end face 2021 of the track body 202 of the mixing drum 200, and the limit member 10 extends from the track body 202 toward the locking buckle 22. The limit member 10 includes two limit blocks 11, the two limit blocks 11 are arranged at intervals, and a stop groove 12 is formed between the two limit blocks 11. When the locking buckle 22 is switched to the locking position, it swings to be located in the stop groove 12.

[0055] like Figure 1 、 Figure 2 and Figure 7 As shown, the mixing drum 200 includes a drum body 201 and a track body 202 arranged on the drum body 201, a supporting wheel 301 is provided on the backstage 300, the track body 202 and the supporting wheel 301 are in rolling contact, the mounting seat 21 is arranged on the side of the supporting wheel 301 facing away from the drum body 201, and the limiting member 10 is arranged on the side of the track body 202 facing the mounting seat 21, which increases the visual range and effectively prevents the locking assembly 20 from blocking the limiting member 10, making it convenient for the operator to observe the position of the limiting member 10 relative to the locking buckle 22, thereby greatly improving the convenience of locking.

[0056] It should be noted that when the operator locks the mixing drum 200, the locking operation is usually performed facing the end face 2021 of the track body 202. When the operator faces the end face 2021 of the track body 202, the locking method of the prior art in which the pin shaft and the locking hole are plugged in together will cause the locking hole to be blocked by the pin shaft. The operator cannot accurately judge the position of the locking hole, resulting in great difficulty in alignment and locking. Even if the operator performs the locking operation from the side of the mixing drum 200, since other components that will block the locking hole are also provided on the back end 300 of the mixer truck, the operator cannot see the position of the locking hole from the side of the mixing drum 200, and it is more difficult to perform the plug-in locking operation from the side of the mixing drum 200, further reducing the convenience of operation.

[0057] In the locking device of the embodiment of the present invention, by setting a limit piece 10 extending from the track body 202 toward the mounting seat 21 on the end face 2021 of the track body 202, the locking buckle 22 is effectively prevented from blocking the limit piece 10. The visual range is wide, so that the operator can perform the locking operation of the mixing drum 200 at a position facing the end face 2021 of the track body 202, which greatly reduces the difficulty of alignment and locking and improves the convenience of the locking operation.

[0058] Furthermore, the two limit blocks 11 of the limit member 10 are arranged at intervals on the track body 202. When the mixing drum 200 needs to be locked, the mixing drum 200 drives the two limit blocks 11 to rotate to the position of the corresponding mounting seat 21, and the locking buckle 22 swings from the unlocking position to the locking position, and extends into the anti-rotation groove 12 between the two limit blocks 11, so that the two sides of the locking buckle 22 can respectively abut against the two limit blocks 11 when the mixing drum 200 rotates forward or reverse, thereby limiting the forward and reverse rotation of the mixing drum 200, realizing the locking of the mixing drum 200, and improving the operation safety.

[0059] In one embodiment of the present invention, the limit member 10 also includes a connecting block, which is arranged between the two limit blocks 11, and the two ends of the connecting block are respectively connected to the two limit blocks 11 one by one, thereby increasing the connection strength between the two limit blocks 11, and thereby improving the structural strength and anti-rotation reliability of the limit member 10.

[0060] In an embodiment of the present invention, the locking assembly 20 also includes a limiting elastic member 23, one end of the limiting elastic member 23 is connected to the mounting seat 21, and the other end of the limiting elastic member 23 is connected to the locking buckle 22. The limiting elastic member 23 is used to limit the swinging of the locking buckle 22 when the locking buckle 22 is switched to a locked position or an unlocked position.

[0061] like Figures 1 to 6 As shown, the two ends of the limiting elastic member 23 are connected to the mounting seat 21 and the locking buckle 22 respectively. The limiting elastic member 23 is in an elastic limit state when the locking buckle 22 is switched to the unlocked position or the locked position to limit the swinging of the locking buckle 22, thereby limiting the locking buckle 22 in the unlocked position or the locked position, and the locking buckle 22 is used to abut against one side of the limiting block 11 when it is in the locked position to limit the rotation of the limiting block 11, thereby limiting the rotation of the mixing drum 200, and the rotation reliability is high, which improves the operation safety, and the limiting elastic member 23 limits the locking buckle 22 to the locked position to prevent the locking buckle 22 from failing to limit the mixing drum 200, further improving the rotation stability and reliability.

[0062] It can be understood that when the locking buckle 22 of the locking assembly 20 is switched to the locked position, a locking limiting force is generated to limit the swinging of the locking buckle 22. When it is necessary to unlock the mixing drum 200, an external force is applied to the locking buckle 22 to overcome the locking limiting force, so that the locking buckle 22 can be swung in a direction away from the limit block 11, thereby releasing the restriction on the mixing drum 200, and the limiting elastic member 23 limits the locking buckle 22 to the unlocked position when the locking buckle 22 is switched to the unlocked position, effectively preventing the locking buckle 200 from being unlocked. 2. The mixing drum 200 is locked by mistake due to shaking. The structure is stable and reliable. In addition, when the locking buckle 22 of the locking assembly 20 is in the unlocked position, a self-locking limiting force is generated to limit the swinging of the locking buckle 22. When the mixing drum 200 needs to be locked, an external force is applied to the locking buckle 22 to overcome the self-locking limiting force, so that the locking buckle 22 can be swung to the locked position and abut against the limit block 11 to limit the rotation of the mixing drum 200. The operation is convenient and simple, and the locking is stable and reliable, which improves the safety of the cleaning operation of the mixing drum 200.

[0063] In an embodiment of the present invention, the locking buckle 22 includes a support plate 221 and two limiting arms 222. The two limiting arms 222 are respectively rotatably arranged on the mounting seat 21, and the two limiting arms 222 are respectively arranged in a one-to-one correspondence with the two limiting blocks 11, and the support plate 221 is connected between the two limiting arms 222.

[0064] like Figure 3 and Figure 4 As shown, the two limit arms 222 are arranged at intervals on the mounting seat 21 and can swing relative to the mounting seat 21. When the two limit arms 222 are swung to the locking position, they both extend into the anti-rotation groove 12, and the two limit arms 222 are respectively used to abut against the two limit blocks 11 one by one to limit the forward or reverse rotation of the mixing drum 200. In addition, one end of the limit elastic member 23 is connected to the mounting seat 21, and the other end of the limit elastic member 23 is connected to one of the limit arms 222. The support plate 221 is connected between the two limit arms 222 to connect and support the two limit arms 222, so that the two limit arms 222 can swing synchronously, and the limit elastic member 23 can limit the two limit arms 222 synchronously in the unlocking position or the locking position, the limitation is stable and reliable, and the support plate 221 is supported between the two limit arms 222, which increases the structural strength and further improves the anti-rotation reliability.

[0065] In an embodiment of the present invention, the limiting arm 222 includes a swinging section 2221 and a limiting section 2222. One end of the swinging section 2221 is swingably arranged on the mounting seat 21, and the other end of the swinging section 2221 is connected to the limiting section 2222, and the limiting section 2222 is bent from the swinging section 2221 toward the limiting block 11.

[0066] like Figures 3 to 6As shown, the swinging section 2221 is swingably arranged on the mounting seat 21 to drive the limiting section 2222 to swing, and the limiting section 2222 is bent in the direction close to the limiting block 11, so that the limiting section 2222 can extend into the anti-rotation groove 12 and extend in the same direction as the limiting block 11 when it is swung to the locking position, thereby increasing the contact area between the limiting section 2222 and the limiting block 11, and further improving the anti-rotation stability and reliability.

[0067] In the embodiment of the present invention, the mounting base 21 includes a bottom plate 211, a mounting plate 212 and a rotating shaft 213. The bottom plate 211 is arranged on the backstage 300, the mounting plate 212 is arranged on the bottom plate 211, and the rotating shaft 213 is arranged through the mounting plate 212 and the swing section 2221. Figures 3 to 6 As shown, the bottom plate 211 is arranged on the backstage 300, the number of the mounting plates 212 is set to two and they are arranged at intervals on the bottom plate 211, the two limiting arms 222 are respectively arranged in a one-to-one correspondence with the two mounting plates 212, and the rotating shaft 213 is arranged through the swing sections 2221 of the two limiting arms 222 and the two mounting plates 212, so that the two limiting arms 222 can swing between the unlocking position and the locking position relative to the two mounting plates 212, and the mixing drum 200 is locked conveniently and quickly.

[0068] In an embodiment of the present invention, the locking assembly 20 further includes a first positioning identification structure and a second positioning identification structure, wherein the first positioning identification structure is provided on the locking buckle 22, and the second positioning identification structure is provided in the anti-rotation groove 12. Specifically, the first identification structure and the second identification structure can be provided as reflective stickers, colored papers, reminder labels, etc. The first identification structure is provided on the locking buckle 22, and the second identification structure is provided in the anti-rotation groove 12, so that the operator can observe the positions of the two limit blocks 11 and then rotate the two limit blocks 11 to the positions corresponding to the locking buckle 22, thereby reducing the difficulty of alignment and locking and improving the convenience of locking.

[0069] In the embodiment of the present invention, the locking assembly 20 further includes an auxiliary alignment block 24, which is rotatably disposed on the mounting seat 21 and is used to swing to the side of the limit block 11 facing away from the anti-rotation groove 12. Figure 7 As shown, the auxiliary alignment block 24 is provided on the rotating shaft 213 so as to be able to swing relative to the mounting plate 212. When the mixing drum 200 needs to be locked, the auxiliary alignment block 24 is swung to the side facing the mixing drum 200, so that the auxiliary alignment block 24 can abut against the side of the limit block 11 facing away from the rotation stop groove 12, thereby facilitating the operator to confirm that the limit block 11 has been swung to the position corresponding to the locking buckle 22, further reducing the difficulty of alignment and locking, and improving the convenience of locking. Moreover, when the mixing drum 200 needs to be unlocked, the auxiliary alignment block 24 is swung to the side facing away from the mixing drum 200 to prevent the auxiliary alignment block 24 from causing rotation interference with the mixing drum 200, and the structural design is reasonable.

[0070] In the embodiment of the present invention, there are multiple limit members 10, and the multiple limit members 10 are circumferentially spaced apart on the mixing drum 200. Specifically, the multiple limit members 10 are circumferentially spaced apart along the outer circumference of the mixing drum 200, and each limit member 10 includes two limit blocks 11. A rotation-stop groove 12 for a locking buckle 22 to extend into is formed between the two limit blocks 11 of each limit member 10, so that the locking buckle 22 can cooperate with any limit member 10 to lock the mixing drum 200, further improving the locking convenience.

[0071] In addition, the present invention also provides a locking device design method, which is used for the locking device for the mixer truck described above. The locking buckle 22 has an abutment area 223, and the abutment area 223 is used to abut with the limiter 10. The allowable stress of the locking buckle 22 and the area of the abutment area 223 satisfy the first strength design formula. The first strength design formula is set as: Wherein, σ is the allowable stress of the locking buckle 22, S is the area of the abutment zone 223, ρ is the density of the accumulated material in the mixing drum 200, V is the preset accumulated material volume in the mixing drum 200, g is the gravity coefficient, D is the diameter of the mixing drum 200, and d is the distance between the limit member 10 and the central axis of the mixing drum 200.

[0072] like Figure 6 As shown, an abutment area 223 is formed at one end of the limiting section 2222 away from the swinging section 2221. The abutment area 223 contacts the limiting block 11 when the limiting section 2222 swings to the locking position, that is, the abutment area 223 plays a role in limiting the rotation of the limiting block 11. The area S of the abutment area 223 is the contact area between the limiting section 2222 and the limiting block 11, and the area S of the abutment area 223 is the effective limiting area; ρ is the density of the accumulated material in the mixing drum 200, that is, ρ is set to be when the mixing drum 200 stops rotating. The density of the mixing material accumulated in the mixing drum 200; V is the preset material accumulation volume, which is the maximum volume of the mixing material allowed to be accumulated in the mixing drum 200; D is the diameter of the mixing drum 200, which is equal to the diameter of the mixing drum 200 when the mixing drum 200 is set as a single-diameter mixing drum, and is equal to the maximum diameter of the mixing drum 200 when the mixing drum 200 is set as a variable-diameter (multi-diameter) mixing drum; d is the distance between the center of gravity of the limit block 11 and the central axis of the mixing drum 200.

[0073] Furthermore, the allowable stress σ of the locking buckle 22 and the area S of the abutment area 223 are set to satisfy the first strength design formula, so that the locking buckle 22 can still effectively limit the mixing drum 200 when a preset volume of mixing material is accumulated in the mixing drum 200, thereby preventing the torque generated by the accumulation of the mixing material from damaging the locking buckle 22 and ensuring the structural design strength. In addition, the minimum allowable stress of the material of the locking buckle 22 and the minimum allowable stress of the material of the limit block 11 are both set to be greater than σ or equal to σ. In order to ensure that the materials used for the locking buckle 22 and the limit block 11 can meet the anti-rotation strength requirements, the embodiment of the present invention calculates the allowable stress σ of the locking buckle 22 and the area S of the abutment area 223 according to the first strength design formula, and then selects the materials of the locking buckle 22 and the limit block 11 according to the allowable stress σ, and designs the dimensions of the limit section 2222 and the limit block 11 according to the area S of the abutment area 223, so that the locking buckle 22 and the limit block 11 can stably lock the mixing drum 200, further improving the anti-rotation stability. It can be understood that the two limit arms 222 of the locking buckle 22 are respectively formed with abutment areas 223, and the number of abutment areas 223 is consistent with the number of limit blocks 11 and is arranged in a one-to-one correspondence.

[0074] Furthermore, In the formula, k is the design safety factor, k is a constant and k=1.3~1.5, σ0 is the maximum stress generated by the abutment between the abutment area 223 and the limit block 11, so as to determine the stress on the locking buckle 22 in the locked position, thereby facilitating the selection of the materials of the locking buckle 22 and the limit block 11 and the design of the dimensions of the locking buckle 22 and the limit block 11, thereby ensuring the structural design strength.

[0075] In the embodiment of the present invention, the locking assembly 20 further includes a handle 25, which is provided on the side of the locking buckle 22 facing away from the limiting member 10. Figures 1 to 6 As shown, the handle 25 is used for the operator to hold and push and pull the handle 25 to drive the locking buckle 22 to swing between the unlocked position and the locked position. The setting of the handle 25 makes it convenient for the operator to apply external force to the locking buckle 22 to overcome the locking limit force or the self-locking limit force, thereby improving the convenience of use.

[0076] In the embodiment of the present invention, the self-locking limiting force generated by the locking assembly 20 when the locking buckle 22 is switched to the unlocked position satisfies the second strength design formula, which is set to:

[0077] Where, F1 is the self-locking limit force; τ m1 Δτ is the moment when the locking buckle 22 is switched to the unlocked position and the gravity of the locking buckle 22 acts on the hinge point, where the hinge point is the connection point between the locking buckle 22 and the mounting seat 21; s1The self-locking elastic force of the limiting elastic member 23 acts on the hinge point. The two ends of the limiting elastic member 23 are respectively connected to the mounting seat 21 and the locking buckle 22; l is the distance between the handle 25 and the hinge point.

[0078] like Figure 5 As shown, when the locking buckle 22 is in the unlocked position, the locking assembly 20 generates a self-locking limiting force to limit the locking buckle 22 from swinging toward the locked position, thereby limiting the locking buckle 22 to the unlocked position. The self-locking limiting force is set to F1. The swinging section 2221 of the locking buckle 22 is hinged to the mounting plate 212 of the mounting seat 21 through the rotating shaft 213, that is, the rotating shaft 213 is set as the hinge point. When the locking buckle 22 is in the unlocked position, the torque of the locking buckle 22 acting on the rotating shaft 213 due to the gravity is set to τ m1 When the locking buckle 22 is in the unlocked position, the limiting elastic member 23 is in the elastic limit state and generates a self-locking elastic force. The self-locking elastic force is used to limit the locking buckle 22 from swinging toward the locked position, thereby limiting the locking buckle 22 to the unlocked position. When the locking buckle 22 is in the unlocked position, the torque of the self-locking elastic force acting on the rotating shaft 213 is set to Δτ. s1 , τ1=τ m1 +Δτ s1 , τ1 is the maximum pushing torque of the handle 25 in the unlocking position, according to The self-locking limiting force is calculated and designed, where l is the distance between the center of gravity of the handle 25 and the hinge point. This can not only ensure the limiting stability of the locking buckle 22 in the unlocked position, but also flexibly set the self-locking limiting force according to the operator's operating habits and actual conditions. The weight of the locking buckle 22 and the elastic deformation of the limiting elastic part 23 are designed according to the self-locking limiting force, thereby improving the structural stability and limiting reliability.

[0079] In the embodiment of the present invention, the locking limit force generated by the locking assembly 20 when the locking buckle 22 is switched to the locked position satisfies the third strength design formula, which is set to:

[0080] Where, F2 is the locking limit force; τ m2 Δτ is the moment when the locking buckle 22 is switched to the locked position and the gravity of the locking buckle 22 acts on the hinge point, where the hinge point is the connection point between the locking buckle 22 and the mounting seat 21; s2 The torque of the locking elastic force of the limiting elastic member 23 acting on the hinge point, the two ends of the limiting elastic member 23 are respectively connected to the mounting seat 21 and the locking buckle 22; l is the distance between the handle 25 and the hinge point.

[0081] like Figure 6As shown, when the locking buckle 22 is in the locked position, the locking assembly 20 generates a locking limiting force to limit the locking buckle 22 from swinging toward the unlocked position, thereby limiting the locking buckle 22 in the locked position. The locking limiting force is set to F2. When the locking buckle 22 is in the locked position, the moment of the gravity of the locking buckle 22 acting on the rotating shaft 213 is set to τ m2 When the locking buckle 22 is in the locked position, the limiting elastic member 23 is in the elastic limit state and generates a locking elastic force. The locking elastic force is used to limit the locking buckle 22 from swinging toward the unlocked position, thereby limiting the locking buckle 22 to the locked position. When the locking buckle 22 is in the locked position, the torque of the locking elastic force acting on the rotating shaft 213 is set to Δτ. s2 , τ2=τ m2 +Δτ s2 , τ2 is the maximum pushing torque of the handle 25 in the locking position, according to The locking limit force is calculated and designed, where l is the distance between the center of gravity of the handle 25 and the hinge point. This can not only ensure the limiting stability of the locking buckle 22 in the locking position, but also flexibly set the locking limit force according to the operator's operating habits and actual conditions. The weight of the locking buckle 22 and the elastic deformation of the limiting elastic part 23 are designed according to the locking limit force, thereby improving the structural stability and limiting reliability.

[0082] In the embodiment of the present invention, Figure 4 As shown, the locking assembly 20 also includes a fastener 26, which is provided on the mounting seat 21, and the fastener 26 is used to connect with the locking buckle 22 when the locking buckle 22 is switched to the unlocked position. The fastener 26 is connected to the locking buckle 22 to limit the locking buckle 22 in the unlocked position, thereby further improving the limiting reliability.

[0083] In the embodiment of the present invention, Figure 4 As shown, the locking assembly 20 also includes a limit plate 27, which is provided on the mounting seat 21, and the locking buckle 22 abuts against the limit plate 27 when switched to the unlocked position. The limit plate 27 abuts against the locking buckle 22 to limit the locking buckle 22 from further swinging away from the limit block 11, effectively preventing the handle 25 from swinging too much and pinching the operator, thereby improving operational safety and limit stability.

[0084] In addition, the present invention also provides a mixer truck, which includes a locking device for a mixer truck according to the above-mentioned embodiment, and the specific structure of the locking device refers to the above-mentioned embodiment. Since the mixer truck adopts all the technical solutions of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be repeated here one by one.

[0085] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0086] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0087] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0088] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A locking device for a mixer truck, characterized in that: The locking device for the mixer truck comprises: A limiting member (10) is provided on a mixing drum (200) of a mixer truck; A locking assembly (20) comprises a mounting seat (21) and a locking buckle (22), wherein the mounting seat (21) is provided on the rear end (300) of the mixer truck, and the locking buckle (22) is rotatably provided on the mounting seat (21) and can be switched between a locked position and an unlocked position, wherein the locking buckle (22) is used to cooperate with the limiting member (10) to limit the rotation of the mixer drum (200) when switched to the locked position, and to release the restriction on the mixer drum (200) when switched to the unlocked position.

2. The locking device for a mixer truck according to claim 1, characterized in that: The limiting member (10) is arranged on the end surface (2021) of the track body (202) of the mixing drum (200), and the limiting member (10) extends from the track body (202) toward the locking buckle (22). The limiting member (10) includes two limiting blocks (11), the two limiting blocks (11) are arranged at intervals, and a rotation-stop groove (12) is formed between the two limiting blocks (11). When the locking buckle (22) is switched to the locking position, it swings to be located in the rotation-stop groove (12).

3. The locking device for a mixer truck according to claim 2, characterized in that: The locking buckle (22) comprises a support plate (221) and two limiting arms (222), the two limiting arms (222) are respectively rotatably arranged on the mounting seat (21), and the two limiting arms (222) are respectively arranged in a one-to-one correspondence with the two limiting blocks (11), and the support plate (221) is connected between the two limiting arms (222).

4. The locking device for a mixer truck according to claim 2, characterized in that: The locking assembly (20) further includes a first positioning identification structure and a second positioning identification structure, wherein the first positioning identification structure is provided on the locking buckle (22), and the second positioning identification structure is provided in the anti-rotation groove (12); And / or, the locking assembly (20) further includes an auxiliary alignment block (24), which is rotatably arranged on the mounting seat (21) and is used to swing to the side of the limit block (11) facing away from the anti-rotation groove (12).

5. The locking device for a mixer truck according to any one of claims 1 to 4, characterized in that: The locking assembly (20) further includes a limiting elastic member (23), one end of the limiting elastic member (23) is connected to the mounting seat (21), and the other end of the limiting elastic member (23) is connected to the locking buckle (22), and the limiting elastic member (23) is used to limit the swinging of the locking buckle (22) when the locking buckle (22) is switched to the locking position or the unlocking position.

6. The locking device for a mixer truck according to any one of claims 1 to 4, characterized in that: The locking assembly (20) further includes a handle (25), and the handle (25) is arranged on a side of the locking buckle (22) facing away from the limiting member (10).

7. The locking device for a mixer truck according to any one of claims 1 to 4, characterized in that: The locking assembly (20) further includes a fastener (26), the fastener (26) being provided on the mounting seat (21), and the fastener (26) being used to connect with the locking buckle (22) when the locking buckle (22) is switched to the unlocked position; And / or, the locking assembly (20) further includes a limit plate (27), the limit plate (27) is provided on the mounting seat (21), and the locking buckle (22) abuts against the limit plate (27) when switched to the unlocked position.

8. A locking device design method, characterized in that: The locking device design method is used for the locking device for a mixer truck according to any one of claims 1 to 7, wherein the locking buckle (22) has an abutment area (223), and the abutment area (223) is used to abut against the limiter (10), and the allowable stress of the locking buckle (22) and the area of the abutment area (223) satisfy a first strength design formula, and the first strength design formula is set as: Wherein, σ is the allowable stress of the locking buckle (22), S is the area of the abutment zone (223), ρ is the density of the accumulated material in the mixing drum (200), V is the preset accumulated material volume in the mixing drum (200), g is the gravity coefficient, D is the diameter of the mixing drum (200), and d is the distance between the limiting member (10) and the central axis of the mixing drum (200).

9. The locking device design method according to claim 8, characterized in that: The self-locking limiting force generated by the locking assembly (20) when the locking buckle (22) is switched to the unlocking position satisfies a second strength design formula, which is set to: Where, F1 is the self-locking limiting force; τ m1 is the moment when the locking buckle (22) is switched to the unlocked position and the gravity of the locking buckle (22) acts on the hinge point, the hinge point being the connection point between the locking buckle (22) and the mounting seat (21); Δτ s1 is the torque of the self-locking elastic force of the limiting elastic member (23) acting on the hinge point, and the two ends of the limiting elastic member (23) are respectively connected to the mounting seat (21) and the locking buckle (22); l is the distance between the handle (25) provided on the locking buckle (22) and the hinge point; And / or, the locking limiting force generated by the locking assembly (20) when the locking buckle (22) is switched to the locking position satisfies a third strength design formula, and the third strength design formula is set to: Where, F2 is the locking limit force; τ m2 is the moment when the locking buckle (22) is switched to the locking position and the weight of the locking buckle (22) acts on the hinge point, the hinge point being the connection point between the locking buckle (22) and the mounting seat (21); Δτ s2 The torque of the locking elastic force of the limiting elastic member (23) acting on the hinge point, the two ends of the limiting elastic member (23) are respectively connected to the mounting seat (21) and the locking buckle (22); l is the distance between the handle (25) provided on the locking buckle (22) and the hinge point.

10. A mixer truck, characterized in that: The mixer truck includes the locking device for a mixer truck according to any one of claims 1 to 7.

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