CN115300852B - Arm support supporting device and engineering vehicle with arm support - Google Patents
Arm support supporting device and engineering vehicle with arm support Download PDFInfo
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- CN115300852B CN115300852B CN202210843369.3A CN202210843369A CN115300852B CN 115300852 B CN115300852 B CN 115300852B CN 202210843369 A CN202210843369 A CN 202210843369A CN 115300852 B CN115300852 B CN 115300852B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C27/00—Fire-fighting land vehicles
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Jib Cranes (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention relates to the technical field of arm support, and discloses an arm support supporting device and an engineering vehicle with an arm support. The invention can reduce the centering requirement and reduce the complex operation of repeated rotary centering for the angle coincidence of the arm support and the vehicle body.
Description
Technical Field
The invention relates to an arm support supporting technology, in particular to an arm support supporting device. In addition, still relate to an engineering vehicle who has the cantilever crane.
Background
The arm support is a device for supporting a vehicle arm support system when the elevating fire truck is in a vehicle-collecting and driving state. When the cantilever crane is used, the cantilever crane falls on the supporting device to form stable and reliable support, so that the situation that the weight of the cantilever crane directly falls on a cab and the cantilever crane possibly swings left and right when a vehicle turns during running is avoided.
At present, arm support supports of a low-meter-section and high-meter-section lifting vehicle are not obviously different, all the supports are fully fixed, the arm support is a steel welding part, the lower end of the arm support is fixed with a vehicle frame, the upper end of the arm support is provided with a nylon block, the arm support is placed in the middle of the arm support and can limit the arm support to move upwards and downwards, and vertical protrusions on two sides of the arm support can limit the arm support to move towards the left and right.
However, for an engineering vehicle with a long boom, when the boom is placed on the boom support, the boom rotation angle needs to be controlled within ± 0.5 ° of the centering position of the boom support, so that the implementation difficulty is high, and the requirement on centering accuracy is high.
In order to ensure that the rotation angle of the arm support is within the range, the movement speed of the arm support on the arm support within a certain range must be very low, and due to the existence of inertia, the arm support often rushes over a centering position, needs to be adjusted by an operator continuously and repeatedly, and has very low efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the arm support supporting device, which can reduce the centering requirement and reduce the complex operation of repeated rotary centering for enabling the arm support and the vehicle body to be overlapped in angle.
The technical problem to be further solved by the invention is to provide an engineering vehicle with an arm support, wherein the arm support supporting device of the engineering vehicle with the arm support can reduce the centering requirement and reduce the complex operation of repeated rotary centering for coinciding the angle of the arm support and the angle of a vehicle body.
In order to solve the technical problem, in one aspect, the invention provides an arm support supporting device, which includes a supporting seat, a supporting main body mounted on the top of the supporting seat, and a supporting frame, wherein the supporting frame is movably mounted on the supporting main body, and a reset mechanism and a limiting assembly for limiting the movement of the supporting frame when the arm support is placed on the supporting frame are arranged between the supporting frame and the supporting main body.
Optionally, a guide portion for guiding the arm support to fall is arranged on the support frame, the support frame is of a U-shaped structure, and the guide portion is an inward inclined plane arranged at the top of two inner side walls of the support frame.
Optionally, the limiting assembly includes a first limiting member disposed on the supporting body and a second limiting member disposed on the supporting frame and capable of forming a locking state with the first limiting member.
Furthermore, the limiting assembly further comprises a supporting element installed on the bottom surface in the supporting frame, a supporting reset assembly is arranged between the supporting element and the bottom surface in the supporting frame, the second limiting part is installed at the bottom of the supporting element, and a through hole capable of enabling the second limiting part to penetrate through and form a locking state with the first limiting part is formed in the bottom surface in the supporting frame.
In particular, the support return assembly is a spring.
In particular, a buffer layer is provided on the support element.
Optionally, each of the first limiting member and the second limiting member is provided with a tooth structure capable of engaging with each other.
Optionally, the first limiting part is a limiting hole, and the second limiting part is a limiting post capable of being matched with the limiting hole.
Optionally, the reset mechanism includes a plurality of springs disposed between the support frame and the support body, and the springs are symmetrically disposed on two sides of the support frame.
The invention further provides an engineering vehicle with the arm support, which is provided with the arm support supporting device in any one of the technical schemes.
Through the technical scheme, the invention has the following beneficial effects:
the reset mechanism is arranged between the support frame and the support main body, when the arm support falls, the extension and retraction of the reset mechanism can allow the arm support to deviate a certain range beyond the existing range of the support frame when the arm support is placed down, the centering difficulty of the arm support is reduced, and the high-difficulty operation that the arm support can be placed down only within the range of +/-0.5 degrees by an operator is avoided. And after the arm support is placed downwards, the limiting assembly can limit the support frame to move along the left and right directions, and the arm support is prevented from swinging left and right when a vehicle runs and turns.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a boom support apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a process of dropping the boom onto the boom support device according to the embodiment of the present invention;
fig. 3 is a schematic view of a use state of a limiting assembly according to an embodiment of the present invention, wherein the arm support is in contact with the limiting assembly;
fig. 4 is a schematic view of a use state of the limiting assembly in the embodiment of the present invention, wherein the arm support is separated from the limiting assembly.
Description of the reference numerals
1 support seat 2 support body
21 first limiting part 3 support frame
31 guide part 4 reset mechanism
51 second stop 52 support element
53 support reset assembly
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined "first", "second" may explicitly or implicitly include one or more of said features.
In the description of the present invention, it should be understood that, unless otherwise specified, the use of directional terms such as "top, bottom, left, and right" generally correspond to the orientation of the boom support means, "top and bottom" refers to the up-down direction of the boom support means, and "left and right" refers to the left-right direction of the boom support means. The orientations and positional relationships shown in the drawings are for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The arm support supporting device is mainly applied to the low-meter-section lifting type vehicles, the low-meter-section lifting type vehicles refer to the lifting type fire fighting vehicles with the maximum working height of about 30 meters or less, and the arm support supporting device is further improved in structure aiming at the problem that the centering precision requirement of the existing arm support is too high.
Referring to fig. 1, the invention provides an arm support supporting device, which comprises a supporting seat 1, a supporting main body 2 and a supporting frame 3, wherein the supporting main body 2 is installed at the top of the supporting seat 1, the supporting frame 3 is movably installed on the supporting main body 2, a reset mechanism 4 is arranged between the supporting frame 3 and the supporting main body 2, after the arm support is placed down, the supporting frame 3 can move towards the side face for a certain distance, a limiting component is arranged between the supporting frame 3 and the supporting main body 2, and under the condition that the arm support is tightly pressed on the supporting frame, the limiting component plays a role in limiting the movement of the supporting frame 3, so that the supporting frame 3 is matched to limit the possible left-right swinging of the arm support when a vehicle runs and turns. After the arm support is lifted, the support frame 3 can be reset under the action of the reset mechanism 4. On the whole, the difficulty of arm support centering can be reduced, the operation of quick support can be realized, the cost is effectively reduced, and the maintenance is convenient.
As a specific structural form of the support frame 3, referring to fig. 1, the support frame 3 may be a U-shaped structure, and two sides of the support frame 3 are vertical protrusions, when the arm support is placed in the support frame 3, the vertical protrusions on the two sides can limit the movement of the arm support along the left-right direction, so that the arm support and the support frame 3 can move synchronously, and the movement of the arm support can be limited under the condition that the limit component limits the movement of the support frame 3. Referring to fig. 2, the supporting frame 3 is provided with guiding portions 31, the guiding portions 31 are located above the edges of the two sides, and when the arm support is lowered, the guiding portions 31 can be used for guiding the arm support to fall, so that the angle range of free lowering of the arm support is enlarged, the guiding portions 31 are arranged in the top areas of the inner side walls of the vertical protrusions on the two sides of the supporting frame 3, and can be inclined planes inclined towards the inner side, and the inclined planes can be flat planes or concave curved surfaces; the guide portion 31 may be configured to guide the boom to be lowered. When the edge of the arm support is positioned on the inclined surface, the downward arm support forms a force at the supporting position, and the component force of the force along the horizontal direction pushes the support frame to move for a certain distance along the horizontal direction, so that the arm support returns to the support frame 3 after passing through the inclined surface.
As a specific structural form of the reset mechanism 4, referring to fig. 1 and 2, the reset mechanism 4 may be a spring, the spring is disposed on the left and right sides of the support frame 3, and one end of the spring abuts against the outer side surface of the support frame 3, and the other end of the spring abuts against the inner side wall of the support body 2, so that the support frame 3 can be reset under the action of the spring on the left and right sides of the support frame 3, and the support frame 3 and the support body 2 are ensured to be centered. Wherein, the quantity of spring is selected as required, generally is the even number, and symmetrical arrangement is in the left and right sides of support frame 3. Alternatively, the return mechanism 4 may be an elastic structure, such as a rubber column.
As another specific structural form of the reset mechanism 4, a slide rod may be disposed on the outer side wall of the support frame 3, and a through hole may be disposed on the side wall of the corresponding support main body 2, so that the slide rod passes through the through hole, and a spring may be sleeved on the slide rod, and the diameter of the spring is greater than that of the through hole on the side wall of the support main body 2, thereby better limiting the moving direction of the support frame 3 and avoiding the deviation under the action of the arm support. Or, the bottom of the support frame 3 is provided with a slide block, the inner bottom of the corresponding support main body 2 is provided with a slide way, and a spring is arranged between the outer side wall of the support frame 3 and the inner side wall of the corresponding support main body 2, so that the slide block can move along the slide way, thereby better limiting the moving direction of the support frame 3 and avoiding the deviation under the action of the arm support.
As for the specific structural form of the limiting assembly, fig. 3 and 4 provide a specific structural form of the limiting assembly, wherein the limiting assembly includes a first limiting member 21 and a second limiting member 51, the first limiting member 21 is disposed on the bottom surface in the supporting main body 2, the second limiting member 51 is disposed on the supporting frame 3, after the boom is lowered to contact with the limiting assembly, the second limiting member 51 moves downward under the action of the gravity of the boom, and forms a locking state with the first limiting member 21, so as to limit the left-right sliding between the supporting frame 3 and the supporting main body 2, that is, to limit the left-right swinging of the boom.
Further, referring to fig. 3 and 4, the limiting component further includes a supporting element 52, the supporting element 52 may be a block structure, a groove is disposed on an inner bottom surface of the supporting frame 3, a lower half portion of the supporting element 52 is located in the groove, a supporting reset component 53 is disposed between the supporting element 52 and the inner bottom surface of the groove on the supporting frame 3, furthermore, a through hole is disposed on the inner bottom surface of the groove, the second limiting component 51 is mounted at the bottom of the supporting element 52, and the second limiting component 51 can pass through the through hole, so that, after the boom is lowered and contacts with the limiting component, the second limiting component 51 passes through the through hole downwards under the action of the gravity of the boom, and then forms a locking state with the first limiting component 21. When the arm support is lifted and separated from the limiting assembly, the supporting element 52 is moved upwards under the action of the supporting and resetting assembly 53, so as to drive the second limiting member 51 to move upwards and separate from the first limiting member 21, and the locking state is released. Wherein the support return member 53 may be an elastic element, such as a rubber column, preferably a spring.
Alternatively, a spring may be sleeved on the outer surface of the second limiting member 51 to replace the supporting and restoring member 53, so as to achieve the restoring function.
Or, the through hole on the inner bottom surface of the groove may be a stepped hole, a spring is sleeved on the outer surface of the second limiting member 51, the spring is located in the stepped hole, and an annular protrusion or a protrusion with another shape abutting against the top of the spring or another part is arranged on the outer surface of the second limiting member 51, after the arm support is lowered and contacts with the limiting component, the second limiting member 51 passes through the through hole downwards under the gravity action of the arm support, and then forms a locking state with the first limiting member 21, at this time, the spring is under the protrusion action of the outer surface of the second limiting member 51 and is in a compression state, and after the arm support is lifted and separated from the limiting component, the second limiting member 51 moves upwards under the action of the spring, and is separated from the first limiting member 21, the locking state is released, and the spring returns to an extension state.
Further, a guiding mechanism may be disposed between the supporting element 52 and the groove on the supporting frame 3, for example, a guiding post is disposed on an inner bottom surface of the groove on the supporting frame 3, correspondingly, a guiding hole is disposed at a position corresponding to the bottom on the supporting element 52, and under cooperation of the guiding post and the guiding hole, the supporting element 52 can move relatively accurately in the groove on the supporting frame 3 along the up-and-down direction. Or, a sliding block may be disposed on the side surface of the support frame 3, and a sliding way is correspondingly disposed on the side wall of the groove on the support frame 3, so that the support element 52 can move along the up-and-down direction in the groove on the support frame 3 more accurately.
In an embodiment, referring to fig. 3, the bottom of the second limiting member 51 is formed with a tooth-shaped structure, and accordingly, the first limiting member 21 is a series of tooth-shaped structures disposed on the inner bottom surface of the supporting body 2, and when the first limiting member 21 contacts with the second limiting member 51, tooth-shaped engagement can occur, so as to limit the left-right sliding between the supporting frame 3 and the supporting body 2.
Or, the first limiting member 21 may also be one or more rows of limiting holes arranged on the inner bottom surface of the supporting main body 2, and correspondingly, the second limiting member 51 may be a limiting post, and the second limiting member 51 may be inserted into the limiting holes to lock the two, so as to limit the left and right sliding between the supporting frame 3 and the supporting main body 2. Further, the second limiting member 51 may be a tapered pin.
In order to reduce the degree of collision with the limiting component when the arm support is lowered, a buffer layer may be disposed on the upper surface of the supporting element 52, for example, the upper portion of the supporting element 52 may be a nylon layer, or may be a material layer with a vibration damping function, such as a rubber layer. Further, a buffer layer may be provided on the inner surface of the support body 2.
In addition, except that the technical scheme is adopted to limit the support frame 3 to move left and right, structural patterns such as baffles, rails and the like can be arranged between the support frame 3 and the support main body 2 and used for limiting in the front-back direction and the up-down direction.
In a specific embodiment, the supporting seat 1 is a mounting seat for connecting the boom support device and the lifting vehicle, and referring to fig. 1, the supporting seat is composed of vertical supporting columns which are symmetrically arranged and reinforcing columns which are obliquely arranged, and the bottom of the supporting seat 1 is a connecting surface with a frame of the lifting vehicle. The support base 1 is not limited to the structure shown in fig. 1, but may be other structures that can be used to mount the arm support device on a vehicle of an elevated type.
In order to better understand the technical solution of the present invention, the following description of the preferred embodiments of the present invention will be given with reference to the relatively full technical features.
Referring to fig. 1 to 4, the boom support apparatus according to the preferred embodiment of the present invention includes a support base 1, a support body 2 and a support frame 3, the support body 2 is mounted on the top of the support base 1, the support body 2 and the support frame 3 are both U-shaped structures, the top areas of the vertical protrusions on both sides of the support frame 3 are provided with guide portions 31, and the guide portions 31 are inclined planes inclined toward the inner side of the support frame 3; reset mechanisms 4 are symmetrically arranged between the outer side surfaces of the two sides of the support frame 3 and the corresponding inner side surface of the support main body 2, and the reset mechanisms 4 can be springs. Be provided with spacing subassembly between the bottom surface in supporting main part 2 bottom and support frame 3, specifically, spacing subassembly includes first locating part 21, second locating part 51, supporting element 52 and support reset assembly 53, set up flutedly on the bottom surface in the support frame 3, the latter half of supporting element 52 is located the recess, set up the through-hole of the medial surface that communicates supporting main part 2 downwards in the recess, the bottom at supporting element 52 is installed to second locating part 51, second locating part 51 passes this through-hole, and, supporting element 52 bottom is seted up and is held the installation cavity that supports reset assembly 53, support reset assembly 53 can be the spring, its one end and the inside upper surface butt of installation cavity, the other end and the interior bottom surface butt of recess. The end of the second limiting member 51 is formed with a tooth structure, the first limiting member 21 is a series of tooth structures formed on the inner bottom surface of the supporting main body 2, and the second limiting member 51 and the first limiting member 21 can be locked.
In the process of lowering the arm support, the arm support does not need to be strictly centered, and referring to fig. 2, even if the outer edge of the arm support presses on the guide part 31, at this time, a force is formed on the inclined surface by the arm support, and a component force of the force in the horizontal direction pushes the support frame 3 to move for a certain distance in the horizontal direction, so that the arm support returns to the inner width of the support frame 3 after passing through the inclined surface. At this time, the reset mechanism 4 on the side is under pressure, the reset mechanism 4 on the other side is under tension, and when the arm support leaves, the support frame 3 can automatically reset under the action of the reset mechanism 4. When the arm support is put on the limiting component, under the action of the arm support, the second limiting part 51 overcomes the resistance of the supporting and resetting component 53, passes through the through hole in the groove on the inner bottom surface of the supporting frame 3, is in contact with the first limiting part 21, and is in toothed meshing with the first limiting part 21, so that the left and right sliding between the supporting frame and the main body is limited, namely, the arm support is prevented from swinging left and right when a vehicle runs and turns. When the arm support leaves the supporting frame 3, the supporting element 52 moves up the supporting element 52 under the reset action of the supporting reset component 53, so as to drive the second limiting member 51 to move up, so that the tooth profile is disengaged, and the locking state is solved.
Aiming at the structural characteristics of the low-meter-section lifting vehicle, the invention optimizes the structural type of the arm support supporting device, can realize the free lowering of the arm support within a certain angle range above the supporting frame 3, reduces the difficulty of arm support centering, and avoids the high-difficulty operation that operators can lower the arm support within the range of +/-0.5 degrees.
Moreover, the arm support supporting device is simple in structure, can realize rapid supporting operation only by using a mechanical structure, can effectively reduce cost and is convenient to maintain.
In addition, the invention also provides an engineering vehicle which is provided with an arm support, such as a lifting type fire-fighting vehicle, a crane and the like.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. The arm support supporting device is characterized by comprising a supporting seat (1), a supporting main body (2) and a supporting frame (3), wherein the supporting main body (2) is mounted at the top of the supporting seat (1), the supporting frame (3) is movably mounted on the supporting main body (2), a resetting mechanism (4) and a limiting assembly for limiting the movement of the supporting frame (3) when the arm support is placed on the supporting frame (3) are arranged between the supporting frame (3) and the supporting main body (2);
the support frame (3) is provided with a guide part (31) for guiding the arm support to fall, and the support frame (3) is of a U-shaped structure; the limiting assembly comprises a first limiting piece (21) arranged on the supporting main body (2) and a second limiting piece (51) which can form a locking state with the first limiting piece (21) and is arranged on the supporting frame (3); under the condition that the arm support is tightly pressed on the support frame (3), the limiting assembly plays a role in limiting the support frame (3) to move.
2. The boom support device according to claim 1, characterized in that the guiding part (31) is an inward inclined slope provided at the top of two inner side walls of the support frame (3).
3. The boom support device according to claim 1, wherein the limiting component further comprises a supporting element (52) installed on the inner bottom surface of the supporting frame (3), a supporting and resetting component (53) is arranged between the supporting element (52) and the inner bottom surface of the supporting frame (3), the second limiting member (51) is installed at the bottom of the supporting element (52), and a through hole through which the second limiting member (51) can pass and the second limiting member (51) and the first limiting member (21) form a locking state is arranged on the inner bottom surface of the supporting frame (3).
4. The boom support apparatus of claim 3, wherein the support return assembly (53) is a spring.
5. The boom support apparatus of claim 3, wherein a buffer layer is provided on the support element (52).
6. The boom support apparatus according to claim 1, wherein the first limiting member (21) and the second limiting member (51) are provided with tooth-shaped structures for engaging with each other.
7. The boom support device according to claim 1, wherein the first limiting member (21) is a limiting hole, and the second limiting member (51) is a limiting post capable of being matched with the limiting hole.
8. The boom support apparatus according to any of the claims 1-7, characterized in that the return mechanism (4) comprises a plurality of springs arranged between the support frame (3) and the support body (2), and each of the springs is symmetrically arranged on both sides of the support frame (3).
9. An engineering vehicle with a boom, characterized in that a boom support device according to any of claims 1-8 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210843369.3A CN115300852B (en) | 2022-07-18 | 2022-07-18 | Arm support supporting device and engineering vehicle with arm support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210843369.3A CN115300852B (en) | 2022-07-18 | 2022-07-18 | Arm support supporting device and engineering vehicle with arm support |
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| Publication Number | Publication Date |
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| CN115300852A CN115300852A (en) | 2022-11-08 |
| CN115300852B true CN115300852B (en) | 2023-04-07 |
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| CN202210843369.3A Active CN115300852B (en) | 2022-07-18 | 2022-07-18 | Arm support supporting device and engineering vehicle with arm support |
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| JP2011073816A (en) * | 2009-09-30 | 2011-04-14 | Tadano Ltd | Boom support structure in boom storage of boom type working vehicle |
| CN202574162U (en) * | 2012-03-28 | 2012-12-05 | 三一重工股份有限公司 | Cantilever crane supporting device and engineering machine |
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| CN204081512U (en) * | 2014-05-14 | 2015-01-07 | 安徽星马专用汽车有限公司 | Concrete mixer and jib rear support thereof |
| CN204456898U (en) * | 2015-01-20 | 2015-07-08 | 三一汽车制造有限公司 | A kind of concrete mixer and arm rest supporting device |
| CN204689587U (en) * | 2015-06-04 | 2015-10-07 | 上海金盾特种车辆装备有限公司 | Cantilever support structure |
| CN114408753A (en) * | 2021-12-30 | 2022-04-29 | 湖南中联重科应急装备有限公司 | Arm support control method, system and device and engineering vehicle |
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2022
- 2022-07-18 CN CN202210843369.3A patent/CN115300852B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011073816A (en) * | 2009-09-30 | 2011-04-14 | Tadano Ltd | Boom support structure in boom storage of boom type working vehicle |
| CN202574162U (en) * | 2012-03-28 | 2012-12-05 | 三一重工股份有限公司 | Cantilever crane supporting device and engineering machine |
| CN203441115U (en) * | 2013-08-23 | 2014-02-19 | 北汽福田汽车股份有限公司 | Arm frame supporting structure and concrete pump truck |
| CN204081512U (en) * | 2014-05-14 | 2015-01-07 | 安徽星马专用汽车有限公司 | Concrete mixer and jib rear support thereof |
| CN204456898U (en) * | 2015-01-20 | 2015-07-08 | 三一汽车制造有限公司 | A kind of concrete mixer and arm rest supporting device |
| CN204689587U (en) * | 2015-06-04 | 2015-10-07 | 上海金盾特种车辆装备有限公司 | Cantilever support structure |
| CN114408753A (en) * | 2021-12-30 | 2022-04-29 | 湖南中联重科应急装备有限公司 | Arm support control method, system and device and engineering vehicle |
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| CN115300852A (en) | 2022-11-08 |
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