Hook arm mechanism and hook arm vehicle
By designing a three-fold hook arm mechanism and using hydraulic drive to position the third fold arm assembly below the chassis, the problem of existing hook arm mechanisms loading below the chassis bucket is solved, achieving a greater range of motion and flexibility.
Patent Information
- Application Number
- CN202423243908.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing hook-arm mechanisms are difficult to load cargo buckets that are lower than the chassis, limiting their range of motion.
Design a three-fold hook arm mechanism, including a first folding arm assembly, a second folding arm assembly and a third folding arm assembly hinged in sequence. When the arm is raised to its limit position by hydraulic drive, the third folding arm assembly is located below the chassis, achieving a greater range of motion.
The increased range of motion of the hook arm mechanism allows it to load cargo buckets lower than the chassis, improving practicality and flexibility.
Smart Images
Figure CN223658952U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of hook arm vehicles, in particular to a hook arm mechanism and a hook arm vehicle. BACKGROUND
[0002] In recent years, with the improvement of living conditions and the improvement of living environment, the detachable hook arm vehicle has emerged as the times require, and is widely used in environmental sanitation, municipal administration, factories and mines, property communities and garbage-concentrated residential areas. A vehicle can be equipped with multiple hoppers, and the hook arm vehicle has a self-unloading function, hydraulic operation, and fast and convenient loading and unloading of hoppers.
[0003] The existing hook arm mechanism has certain limitations and is difficult to load hoppers below the chassis. CONTENT OF THE UTILITY MODEL
[0004] Therefore, the present application provides a hook arm mechanism and a hook arm vehicle, aiming to solve one of the technical problems in the prior art.
[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:
[0006] In a first aspect, the present application provides a hook arm mechanism, comprising:
[0007] The chassis comprises a receiving portion and a fixed portion;
[0008] The three-fold hook arm comprises a first folding arm assembly, a second folding arm assembly and a third folding arm assembly which are sequentially hinged, and the first folding arm assembly is further hinged with the fixed portion, wherein:
[0009] When the three-fold hook arm is not raised, the first folding arm assembly and the second folding arm assembly are located in the receiving portion, and the third folding arm assembly is arranged at the end of the chassis away from the fixed portion and above the chassis;
[0010] When the three-fold hook arm is raised to the limit position, the first folding arm assembly, the second folding arm assembly and the third folding arm assembly rotate towards the fixed portion respectively, and the third folding arm assembly is arranged at the end of the chassis away from the receiving portion and at least partially below the chassis.
[0011] In one embodiment of the first aspect, the chassis comprises two support rods and a fixed seat, the two support rods are arranged at intervals, the fixed seat is arranged between the two support rods and divides the space between the two support rods into the receiving portion and the fixed portion, the fixed seat is arranged in the fixed portion, and the three-fold hook arm is arranged in the receiving portion.
[0012] In one embodiment of the first aspect, the first folding arm assembly comprises a first folding arm, an end of the first folding arm is hingedly connected to the fixed base;
[0013] An active clamping member is provided between the first folding arm and the fixed base, when the active clamping member is in a clamped state, the first folding arm is accommodated in the accommodating portion and cannot rotate relative to the fixed base, when the active clamping member is in an unclamped state, the first folding arm can rotate relative to the fixed base.
[0014] In one embodiment of the first aspect, the first folding arm assembly further comprises a first driving member, the first driving member comprises a first hydraulic cylinder and a first piston rod, an end of the first piston rod is hingedly connected to the first folding arm, the first hydraulic cylinder is hingedly connected to the support rod.
[0015] In one embodiment of the first aspect, the second folding arm assembly comprises a second folding arm and a second driving member, an end of the second folding arm is hingedly connected to an end of the first folding arm;
[0016] The second driving member comprises a second hydraulic cylinder and a second piston rod, the second hydraulic cylinder is hingedly connected to a side of the second folding arm away from the first folding arm, an end of the second piston rod is hingedly connected to the first folding arm.
[0017] In one embodiment of the first aspect, the third folding arm assembly comprises a third folding arm and a third driving member, an end of the third folding arm is hingedly connected to an end of the second folding arm, the third driving member comprises a third hydraulic cylinder and a third piston rod, the third hydraulic cylinder is hingedly connected to a side of the third folding arm close to the second folding arm, an end of the third piston rod is hingedly connected to the third folding arm.
[0018] In one embodiment of the first aspect, the third folding arm assembly further comprises a lifting lug, the lifting lug is connected to an end of the third folding arm away from the second folding arm, when the third folding hook arm is raised to a limit position, the lifting lug is located below the chassis.
[0019] In one embodiment of the first aspect, the chassis further comprises a roller assembly, the roller assembly is provided on a side of the chassis away from the accommodating portion.
[0020] In one embodiment of the first aspect, the chassis further comprises a clamping assembly, the clamping assembly comprises a first clamping jaw, a second clamping jaw and a fourth driving member, the second clamping jaw and the first clamping jaw are spaced apart along a direction perpendicular to a length direction of the support rod, the fourth driving member drives the first clamping jaw and the second clamping jaw to open and close along a length direction of the chassis;
[0021] and / or;
[0022] The chassis further comprises a locking assembly arranged on the fixing seat, the locking assembly comprising at least one locking block formed with a clamping groove, the opening of the clamping groove facing the roller assembly.
[0023] In a second aspect, the embodiments of the present application further provide a hook arm vehicle comprising the hook arm mechanism in any of the above embodiments.
[0024] Compared with the prior art, the present application has the beneficial effects that: the present application provides a hook arm mechanism, comprising a chassis and a three-fold hook arm, the chassis comprising a receiving part and a fixing part; the three-fold hook arm comprising a first folding arm assembly, a second folding arm assembly and a third folding arm assembly which are sequentially hinged, and the first folding arm assembly is further hinged with the fixing part, wherein: when the three-fold hook arm is raised to the limit position, the first folding arm assembly, the second folding arm assembly and the third folding arm assembly respectively rotate towards the direction close to the fixing part, the third folding arm assembly is arranged at the end of the chassis away from the receiving part and at least partially below the chassis, so that the activity range of the hook arm mechanism is larger, the hook arm mechanism can load the hopper lower than the chassis, and the practicality is strong. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.
[0026] Figure 1 Fig. 1 shows one of the structural schematic diagrams of the hook arm mechanism in some embodiments of the present application;
[0027] Figure 2 Fig. 2 shows another of the structural schematic diagrams of the hook arm mechanism in some embodiments of the present application;
[0028] Figure 3 Fig. 3 shows a third of the structural schematic diagrams of the hook arm mechanism in some embodiments of the present application;
[0029] Figure 4 Fig. 4 shows a structural schematic diagram of the movable clamping piece in some embodiments of the present application;
[0030] Figure 5 Fig. 5 shows an enlarged structural schematic diagram of I in Fig. 4. Figure 1
[0031] Main element symbol explanation: 100 - hook arm mechanism; 110 - chassis; 113 - receiving part; 114 - fixing part; 111 - support rod; 112 - fixing seat;
[0032] 121 - first folding arm assembly; 122 - second folding arm assembly; 123 - third folding arm assembly; 124 - hydraulic system; 1211 - first folding arm; 1212 - first hydraulic cylinder; 1213 - first piston rod; 1221 - second folding arm; 1222 - second hydraulic cylinder; 1223 - second piston rod; 1231 - third folding arm; 1232 - third hydraulic cylinder; 1233 - third piston rod; 1234 - lifting lug;
[0033] 130 - movable clamping piece; 131 - hook; 132 - spring; 141 - hinged shaft; 142 - roller; 151 - first clamping jaw; 152 - second clamping jaw; 161 - locking block; 1611 - clamping groove. DETAILED DESCRIPTION
[0034] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as a limitation of the present application.
[0035] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0036] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0037] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0038] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0039] As shown in Figure 1 and Figure 2 Embodiments of the present application provide a hook arm mechanism 100, which is mainly used for pulling and hoisting goods in a cargo bucket and dumping the goods.
[0040] The hook arm mechanism 100 includes a chassis 110 and a three-fold hook 131.
[0041] The chassis 110 includes a receiving portion 113 and a fixing portion 114. The receiving portion 113 is used to accommodate the three-fold hook arm, and the fixing portion 114 is used to lock the cargo bucket on the chassis 110.
[0042] The three-fold hook arm includes a first folding arm assembly 121, a second folding arm assembly 122 and a third folding arm assembly 123 which are sequentially hinged, and the first folding arm assembly 121 is further hinged with the fixing portion 114.
[0043] It should be noted that the three-fold hook arm refers to three main folding parts, and a plurality of sub-folding arms can be arranged in each folding arm assembly as required. When the folding arm assembly is accommodated, the sub-folding arms are stacked, and when the folding arm assembly is unfolded, the sub-folding arms are connected in a straight line to form a large folding arm.
[0044] As shown in Figure 1 When the three-fold hook arm is not raised, the first folding arm assembly 121 and the second folding arm assembly 122 are located in the receiving portion 113, and the third folding arm assembly 123 is arranged at the end of the chassis 110 away from the fixing portion 114 and above the chassis 110.
[0045] In the related art, the first folding arm assembly and the second folding arm assembly arranged in the accommodating portion are usually set as an integral body that cannot move relative to each other. In this way, when the hook arm mechanism needs to lift the hopper, the total length of the first folding arm and the second folding arm is large, the movement range is limited, and the hook is not easy to extend below the chassis.
[0046] As shown in Figure 3 When the three-fold hook arm is raised to the limit position, the first folding arm assembly 121, the second folding arm assembly 122, and the third folding arm assembly 123 are respectively rotated towards the direction close to the fixed portion 114. The third folding arm assembly 123 is arranged at the end of the chassis 110 away from the accommodating portion 113 and at least partially below the chassis 110.
[0047] Compared with the prior art, the first folding wall assembly and the second folding arm assembly 122 are hinged without increasing the total length of the first folding wall assembly and the second folding arm assembly 122, an active joint is added, the movement range of the three-fold hook arm is larger, and the three-fold hook arm is more flexible. The hook 131 can easily extend below the chassis 110 to hook the hopper.
[0048] In some embodiments, the chassis 110 includes two support rods 111 and a fixed seat 112. The two support rods 111 are arranged at intervals, and the fixed seat 112 is arranged between the two support rods 111 and divides the space between the two support rods 111 into the accommodating portion 113 and the fixed portion 114. The fixed seat 112 is arranged in the fixed portion 114, and the three-fold hook arm is arranged in the accommodating portion 113.
[0049] The fixed seat 112 is fixedly connected with the two support rods 111, and the fixed seat 112 is used as the base of the three-fold hook arm to enable the three-fold hook arm to rotate.
[0050] The chassis is connected with the vehicle body, and the vehicle body drives the hook arm mechanism 100 to quickly move to the construction site.
[0051] The outer side of the support rod 111 is also connected with a hydraulic system 124. The driving device in the present application is a hydraulic driving device.
[0052] In some embodiments, the first folding arm assembly 121 includes a first folding arm 1211, and the end of the first folding arm 1211 is hingedly connected with the fixed seat 112.
[0053] In one embodiment, the fixed seat 112 is provided with a rotating shaft extending along the length direction perpendicular to the support rod 111. The fixed seat 112 is also provided with two bearings respectively sleeved on the ends of the rotating shaft, so that the rotating shaft is connected with the fixed seat 112 while keeping the state of being able to rotate around the axis thereof. The end of the first folding arm 1211 is fixedly connected with the rotating shaft, so that the first folding wall can rotate around the axis of the rotating shaft.
[0054] The first folding arm 1211 and the fixed part 114 are provided with a movable clamping piece 130. When the movable clamping piece 130 is in the clamping state, the first folding arm 1211 is accommodated in the accommodating part 113 and cannot rotate relative to the fixed seat 112. When the movable clamping piece 130 is in the unclamping state, the first folding arm 1211 can rotate relative to the fixed seat 112.
[0055] In one embodiment, as shown in Figure 2 and Figure 4 , the number of movable clamping pieces 130 is two, and the two movable clamping pieces 130 are arranged in the length direction of the vertical support rod 111 and are respectively arranged on the outer side of the first folding arm 1211. The movable clamping piece 130 includes a hook 131 and a spring 132.
[0056] When the movable clamping piece 130 is in the clamping state, the opening of the hook 131 hooks the edge of the fixed seat 112, and the reset spring 132 is connected with the hook 131, and the hook 131 and the fixed seat 112 are always in the connected state.
[0057] It should be noted that when the movable clamping piece 130 is in the clamping state, the first folding arm assembly 121 and the second folding arm assembly 122, and the second folding arm assembly 122 and the third folding arm assembly 123 are in a movable state, that is, the second folding arm assembly 122 and the third folding arm assembly 123 are movable and can move the hopper.
[0058] The hook 131 and the fixed seat 112 are unhooked and separated, so that the movable clamping piece 130 is in the unclamping state.
[0059] In some embodiments, the first folding arm assembly 121 further includes a first driving piece, and the first driving piece includes a first hydraulic cylinder body 1212 and a first piston rod 1213. The end of the first piston rod 1213 is hinged with the first folding arm 1211, and the first hydraulic cylinder body 1212 is hinged with the support rod 111.
[0060] As shown in Figure 2 , in one embodiment, the chassis is provided with a rotating shaft, the rotating shaft extends along the length direction of the vertical support rod 111 and is connected with the end of the support rod 111 away from the fixed part 114. The support rod 111 is also provided with a bearing, which is respectively sleeved on the end of the rotating shaft, so that the rotating shaft is connected with the support rod 111 while keeping the state of being able to rotate around its axis. The end of the first hydraulic cylinder body 1212 is fixedly connected with the rotating shaft, so that the first hydraulic cylinder body 1212 can rotate around the axis of the rotating shaft. The number of first hydraulic cylinder bodies 1212 is two, and they are arranged in the length direction of the vertical support rod 111.
[0061] As shown in Figures 1 to 3As shown, in one embodiment, the first folding arm 1211 is provided with a rotating shaft, which extends along the length direction of the vertical support rod 111 and is connected with the first folding arm 1211. The support rod 111 is further provided with a through hole or a bearing, and the rotating shaft is arranged in the through hole or the bearing, so that the rotating shaft is connected with the first folding arm 1211 while keeping the state of being able to rotate around the axis thereof. The end of the first piston rod 1213 is fixedly connected with the rotating shaft, so that the first piston rod 1213 can rotate around the axis of the rotating shaft.
[0062] The first piston rod 1213 extends and retracts along the length direction of the first hydraulic cylinder body 1212, and drives the first folding arm 1211 to rotate towards or away from the fixed part 114.
[0063] In some embodiments, the second folding arm assembly 122 includes a second folding arm 1221 and a second driving member, and the end of the second folding arm 1221 is hingedly connected with the end of the first folding arm 1211.
[0064] The second driving member includes a second hydraulic cylinder body 1222 and a second piston rod 1223, the second hydraulic cylinder body 1222 is hingedly connected with the side of the second folding arm 1221 away from the first folding arm 1211, and the end of the second piston rod 1223 is hingedly connected with the first folding arm 1211.
[0065] Among them, the first folding arm 1211 and the second folding arm 1221, the second hydraulic cylinder body 1222 and the second folding arm 1221, and the second piston rod 1223 and the first folding arm 1211 are all hingedly connected through rotating shafts, which will not be repeated here.
[0066] The second piston rod 1223 extends and retracts along the length direction of the second hydraulic cylinder body 1222, and drives the second folding arm 1221 to rotate towards or away from the fixed part 114.
[0067] In some embodiments, the third folding arm assembly 123 includes a third folding arm 1231 and a third driving member, and the end of the third folding arm 1231 is hingedly connected with the end of the second folding arm 1221. The third driving member includes a third hydraulic cylinder body 1232 and a third piston rod 1233, the third hydraulic cylinder body 1232 is hingedly connected with the side of the third folding arm 1231 close to the second folding arm 1221, and the end of the third piston rod 1233 is hingedly connected with the third folding arm 1231.
[0068] Among them, the third folding arm 1231 and the second folding arm 1221, the third hydraulic cylinder body 1232 and the third folding arm 1231, and the third piston rod 1233 and the third folding arm 1231 are all hingedly connected through rotating shafts, which will not be repeated here.
[0069] The third piston rod 1233 is telescopic along the length direction of the third hydraulic cylinder 1232, and drives the third folding arm 1231 to rotate towards or away from the fixed part 114.
[0070] In some embodiments, the third folding arm assembly 123 further comprises a lifting lug 1234 connected to the end of the third folding arm 1231 away from the second folding arm 1221. When the three-folded hook arm is raised to the limit position, the lifting lug 1234 is below the chassis 110.
[0071] As shown in Figure 1 and Figure 3 , as the third folding arm 1231 rotates towards the fixed part 114, the opening of the lifting lug 1234 faces the rear of the hopper, facilitating the lifting of the hopper. As the third folding arm 1231 rotates away from the fixed part 114, the opening of the lifting lug 1234 faces forward, making it difficult for the lifting lug 1234 and the hopper to separate, reducing the risk of unhooking.
[0072] In some embodiments, as shown in Figure 1 and Figure 5 , the chassis further comprises a roller 142 assembly arranged on the side of the chassis away from the receiving part 113. In this way, when the lifting lug 1234 lifts the hopper and loads the hopper onto the chassis 110, the hopper first contacts the roller 142 assembly, and the bottom of the hopper rolls on the roller 142, reducing the friction between the hopper and the chassis 110, facilitating rapid loading of the hopper.
[0073] The roller 142 assembly comprises a hinge shaft 141 and two rollers 142. The hinge shaft 141 extends along the length direction of the vertical support rod 111, and is connected to the support rod 111 and kept rotatable about the axis. The rollers 142 are connected to the hinge shaft 141 and kept rotatable about the axis.
[0074] It should be noted that the fixed seat 112 and the hinge shaft 141 are fixedly connected, forming a hinge between the fixed seat 112 and the support rod 111. In this way, when the movable clamping member 130 is in the clamped state, the three-folded hook arm and the fixed seat 112 are connected and fixed, and the first driving member drives the three-folded hook arm and the fixed seat 112 as a whole to rotate about the hinge shaft 141, dumping the goods in the hopper.
[0075] In some embodiments, as shown in Figure 1 and Figure 5As shown, the chassis further comprises a clamping assembly, the clamping assembly comprises a first clamping jaw 151, a second clamping jaw 152 and a fourth driving member, the second clamping jaw 152 and the first clamping jaw 151 are respectively fixed on the chassis and are spaced along the length direction of the vertical support rod 111, and the fourth driving member drives the first clamping jaw 151 and the second clamping jaw 152 to open and close along the length direction of the chassis, so that when the goods in the hopper need to be poured, the movement of the hopper can be prevented.
[0076] In some embodiments, as shown in Figure 1 and Figure 5 As shown, the chassis further comprises a locking assembly, the locking assembly is arranged on the fixed seat 112, the locking assembly comprises at least one locking block 161, the locking block 161 is formed with a clamping groove 1611, and the opening of the clamping groove 1611 faces the roller 142 assembly. The bottom of the hopper is correspondingly provided with a slot which is in abutment with the locking block 161, when the clamping groove 1611 of the locking block 161 and the clamping groove 1611 of the bottom of the hopper are in abutment, it prompts that the hopper is loaded in place.
[0077] The working process of the hook arm mechanism 100 is as follows:
[0078] Loosen the hook 131 of the movable clamping piece 130 and the fixed seat 112, the first driving member drives the first folding arm 1211 to rotate around the fixed seat 112 to the direction close to the fixed seat 112, the second driving member drives the second folding arm 1221 to rotate around the first folding arm 1211 to the direction close to the fixed seat 112, and the third driving member drives the third folding arm 1231 to rotate around the second folding arm 1221 to the direction close to the fixed seat 112, so that the lifting lug 1234 is close to the hopper;
[0079] When the three-fold hook arm assembly of the present application is raised to the limit position, the lifting lug 1234 is located below the chassis, which is convenient for the hook connection of the lifting lug 1234 and the hopper;
[0080] After the lifting lug 1234 and the hopper are connected, the first driving member, the second driving member and the third driving member drive the first folding arm 1211, the second folding arm 1221 and the third folding arm 1231 to rotate in the opposite direction respectively, so as to drag the hopper to move to the chassis 110;
[0081] During the movement of the hopper, the chassis 110 of the hopper and the roller 142 assembly are in rolling connection;
[0082] During the movement of the hopper, the clamping groove 1611 at the bottom of the hopper and the clamping groove 1611 of the locking block 161 are in abutment;
[0083] When the three-fold hook arm is reset, the fourth driving member drives the first clamping jaw 151 and the second clamping jaw 152 to close, so as to fix the hopper on the chassis;
[0084] The hook 131 of the movable joint 130 is connected with the fixed seat 112;
[0085] The first driving member drives the three-folded hook arm and the fixed seat 112 to rotate as a whole around the hinge shaft 141, and the goods in the hopper are poured out. After the goods are poured out, the first driving member drives the three-folded hook arm and the fixed seat 112 to fall to the bottom plate.
[0086] In the present application, a hook arm vehicle is also provided, which comprises the hook arm mechanism 100 in any of the above embodiments, and thus has all the beneficial effects of the hook arm mechanism 100 in any of the above embodiments, which will not be repeated here.
[0087] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present description and the features of different embodiments or examples can be combined and modified by those skilled in the art without contradiction.
[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.
Claims
1. A hook arm mechanism, characterized by, The utility model relates to a three-fold hook arm, comprising a chassis and a three-fold hook arm, wherein: the chassis comprises a receiving part and a fixing part; the three-fold hook arm comprises a first folding arm assembly, a second folding arm assembly and a third folding arm assembly which are sequentially hinged, and the first folding arm assembly is further hinged with the fixing part, wherein: when the three-fold hook arm is not raised, the first folding arm assembly and the second folding arm assembly are located in the receiving part, and the third folding arm assembly is arranged at the end of the chassis away from the fixing part and above the chassis; when the three-fold hook arm is raised to the limit position, the first folding arm assembly, the second folding arm assembly and the third folding arm assembly are respectively rotated towards the fixing part, and the third folding arm assembly is arranged at the end of the chassis away from the receiving part and at least partially below the chassis.
2. The hook arm mechanism of claim 1, wherein, the chassis comprises two support rods and a fixing seat, the two support rods are arranged at intervals, the fixing seat is arranged between the two support rods and separates the space between the two support rods to form the receiving part and the fixing part, the fixing seat is arranged in the fixing part, and the three-fold hook arm is arranged in the receiving part.
3. The hook arm mechanism of claim 2, wherein, the first folding arm assembly comprises a first folding arm, and the end of the first folding arm is hinged with the fixing seat; an active clamping piece is arranged between the first folding arm and the fixing part, when the active clamping piece is in the clamping state, the first folding arm is accommodated in the receiving part and cannot rotate relative to the fixing seat, and when the active clamping piece is in the loosening state, the first folding arm can rotate relative to the fixing seat.
4. The hook arm mechanism of claim 3, wherein, the first folding arm assembly further comprises a first driving piece, the first driving piece comprises a first hydraulic cylinder body and a first piston rod, the end of the first piston rod is hinged with the first folding arm, and the first hydraulic cylinder body is hinged with the support rod.
5. The hook arm mechanism of claim 3, wherein, the second folding arm assembly comprises a second folding arm and a second driving piece, and the end of the second folding arm is hinged with the end of the first folding arm; the second driving piece comprises a second hydraulic cylinder body and a second piston rod, the second hydraulic cylinder body is hinged with the second folding arm away from the side of the first folding arm, and the end of the second piston rod is hinged with the first folding arm.
6. The hook arm mechanism of claim 5, wherein, the third folding arm assembly comprises a third folding arm and a third driving piece, the end of the third folding arm is hinged with the end of the second folding arm, the third driving piece comprises a third hydraulic cylinder body and a third piston rod, the third hydraulic cylinder body is hinged with the third folding arm close to the side of the second folding arm, and the end of the third piston rod is hinged with the third folding arm.
7. The hook arm mechanism of claim 6, wherein, the third folding arm assembly further comprises an ear, the ear is connected with the end of the third folding arm away from the second folding arm, and when the three-fold hook arm is raised to the limit position, the ear is below the chassis.
8. The hook arm mechanism of any one of claims 2 to 6, wherein, the chassis further comprises a roller assembly, and the roller assembly is arranged at the side of the chassis away from the receiving part.
9. The hook arm mechanism of claim 8, wherein, The chassis further comprises a clamping assembly, the clamping assembly comprises a first clamping jaw, a second clamping jaw and a fourth driving member, the second clamping jaw and the first clamping jaw are spaced apart along a direction perpendicular to a length direction of the support rod, the fourth driving member drives the first clamping jaw and the second clamping jaw to open and close along a direction perpendicular to a length direction of the chassis. And / or; The chassis further comprises a locking assembly, the locking assembly is arranged on the fixing seat, the locking assembly comprises at least one locking block, the locking block is formed with a clamping groove, and an opening of the clamping groove faces the roller assembly.
10. A hook-lift vehicle characterized in that A hook arm mechanism comprising any one of claims 1 to 9.