A new type of crank arm device

Abstract

The present invention discloses a novel crank arm device, which relates to the technical field of aerial work platforms. The novel crank arm device comprises: an arm frame, a leveling cylinder, a main arm cylinder, a first connector and a second connector, a first folding arm and a second folding arm, a first connecting rod and a second connecting rod, a crank arm cylinder, a third connecting rod, and a turntable; the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all integral structures. In the novel crank arm device provided by the present invention, the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all configured as an integral structure and can be directly connected to the first connector and the second connector, thereby improving the stiffness of the first folding arm, the second folding arm, the first connecting rod and the second connecting rod, thereby improving the overall stiffness of the novel crank arm device, and meeting the needs of increasing lifting height and load capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of aerial work platforms, and more particularly to a novel crank arm device. Background Art

[0002] In the prior art, in order to ensure smooth connection between the folding arm, connecting rod and connecting frame of the articulated arm lifting platform, the folding arm and connecting rod are generally set as a spliced ​​structure, resulting in insufficient rigidity of the articulated arm lifting platform. When the lifting height and load capacity are increased, it cannot meet the use requirements.

[0003] In summary, how to improve the stiffness of the novel crank arm device is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a new type of crank arm device, in which the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all arranged as an integral structure, so that the first folding arm, the second folding arm, the first connecting rod and the second connecting rod can be directly connected to the first connecting body and the second connecting body, avoiding the need for additional connecting parts on the first folding arm, the second folding arm, the first connecting rod and the second connecting rod, thereby ensuring the overall rigidity of the new crank arm device and meeting the situation of increased lifting height and load-bearing capacity.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A novel crank arm device includes: an arm frame, a leveling cylinder, a main arm cylinder, a first connector and a second connector, a first folding arm and a second folding arm, a first connecting rod and a second connecting rod, a folding arm cylinder, a third connecting rod, and a turntable; the first folding arm, the second folding arm, the first connecting rod, and the second connecting rod are all integral structures, and the first folding arm and the first connecting rod are hinged at one end to the first connector and at the other end to the second connector; the second folding arm and the second connecting rod are hinged at one end to the second connector and at the other end to the turntable; the third connecting rod is hinged at one end to the first folding arm and at the other end to the second folding arm;

[0007] The leveling cylinder and the main arm cylinder are both hinged at one end to the first connector and at the other end to the boom; the folding arm cylinder is hinged at one end to the second connector and at the other end to the first folding arm;

[0008] The first folding arm is parallel to the first connecting rod, and the second folding arm is parallel to the second connecting rod.

[0009] Optionally, the first connecting rod includes a first rectangular tube body and first sleeves arranged at both ends of the first rectangular tube body in the longitudinal direction; the second connecting rod includes a second connecting rod body and second sleeves arranged at both ends of the second rectangular tube body in the longitudinal direction.

[0010] Optionally, the first folding arm includes a third rectangular tube body, and a third shaft sleeve and an ear plate on which the third shaft sleeve is installed are respectively provided at both ends of the length direction of the third rectangular tube body; the second folding arm includes a fourth rectangular tube body, and a fourth shaft sleeve is provided at both ends of the length direction of the fourth rectangular tube body.

[0011] Optionally, the first sleeve is welded to the first rectangular tube body, the second sleeve is welded to the second rectangular tube body, one of the third sleeves is welded to the third rectangular tube body, the other third sleeve is welded to the ear plate, and the fourth sleeve is welded to the fourth rectangular tube body.

[0012] Optionally, the first connecting body includes a first trough plate, a first support plate, a second support plate and a connecting tube, the first support plates are provided on both inner side walls of the first trough plate, the two oppositely arranged first support plates are connected by the connecting tube, one end of the second support plate is connected to the connecting tube, and the other end is connected to the first trough plate; the first connecting rod is connected to the first fulcrum of the inter-branch structure formed by the first trough plate and the first support plate, and the first folding arm is connected to the second fulcrum of the inter-branch structure formed by the first trough plate and the second support plate.

[0013] Optionally, the second connector includes a second slot plate, two third support plates, two fourth support plates, and two fifth support plates, wherein the third support plates, the fourth support plates, and the fifth support plates are all located in the U-shaped structure and are symmetrically arranged with respect to a middle cross-section in a width direction of the second slot plate;

[0014] The third support plate, the fourth support plate, and the fifth support plate are sequentially arranged from both sides of the second slot plate in the width direction to the middle;

[0015] The second trough plate and the two third support plates are provided with a third fulcrum for connecting to the second connecting rod, a fourth fulcrum for connecting to the second folding arm, and a fifth fulcrum for connecting to the first folding arm. The third support plate and the fourth support plate are provided with a sixth fulcrum for connecting to the first connecting rod, and the two fifth support plates are provided with a seventh fulcrum for connecting to the folding arm cylinder.

[0016] Optionally, the second connector further includes a first upper connecting plate and a first lower connecting plate connecting the third support plate and the side wall of the second trough plate, a second connecting plate connecting the third support plate and the fourth support plate, and a third connecting plate connecting the two fifth support plates; so that the second connector forms an open box structure.

[0017] Optionally, the turntable includes a bottom plate, a first vertical support plate and a second vertical support plate, the first vertical support plate and the second vertical support plate are directly connected to the bottom plate, and the first vertical support plate and the second vertical support plate are arranged parallel to each other;

[0018] The first vertical support plate and the second vertical support plate are both provided with a first turntable fulcrum for connecting the second connecting rod and a second turntable fulcrum connected to the second folding arm.

[0019] Optionally, the turntable further includes at least one turntable connecting plate connecting the first vertical support plate and the second vertical support plate, so that the turntable forms an open box structure.

[0020] Optionally, projections of the first vertical support plate and the second vertical support plate onto the bottom plate are completely located within the bottom plate.

[0021] In the process of using the new crank arm device provided by the present invention, the stability of the arm is adjusted by the leveling cylinder, the angle of the arm is adjusted by the main arm cylinder, and the angle between the two folding arms is adjusted by the folding arm cylinder to adjust the angle of the arm.

[0022] Compared with the prior art, in the new crank arm device provided by the present invention, the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all arranged as an integral structure, so that the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all arranged as an integral structure and can be directly connected to the first connecting body and the second connecting body, without the need to additionally set connecting ear plates on the first folding arm, the second folding arm, the first connecting rod and the second connecting rod. Compared with the prior art method of welding connecting ear plates at both ends of the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all arranged as an integral structure, the stiffness of the first folding arm, the second folding arm, the first connecting rod and the second connecting rod can be improved, thereby improving the overall stiffness of the new crank arm device, which can meet the situation of increased lifting height and carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of a specific embodiment of the novel crank arm device provided by the present invention;

[0025] Figure 2 is a structural schematic diagram of the first connecting rod;

[0026] Figure 3 Schematic diagram of the structure of the first folding arm;

[0027] Figure 4 is a structural schematic diagram of the second connecting rod;

[0028] Figure 5 Schematic diagram of the structure of the second folding arm;

[0029] Figure 6 is a schematic structural diagram of the first connector;

[0030] Figure 7 is a schematic structural diagram of the second connector;

[0031] Figure 8 This is a structural diagram of the turntable.

[0032] Figures 1-8 middle:

[0033] 1 is the boom, 2 is the main arm cylinder, 3 is the leveling cylinder, 4 is the first connector, 401 is the first slot plate, 402 is the first support plate, 403 is the second support plate, 404 is the connecting pipe, 411 is the first fulcrum, 412 is the second fulcrum, 5 is the first folding arm, 501 is the third rectangular tube body, 502 is the third shaft sleeve, 503 is the ear plate, 6 is the folding arm cylinder, 7 is the second connecting rod, 701 is the second rectangular tube body, 702 is the second shaft sleeve, 8 is the turntable, 801 is the first vertical support plate, 802 is the second vertical support plate, 803 is the first turntable connecting plate, 804 is the second turntable connecting plate, 805 is the third turntable connecting plate, 806 is the bottom plate, and 811 is the first turntable The fulcrum is 812, 9 is the second turntable fulcrum, 9 is the second folding arm, 901 is the fourth rectangular tube body, 902 is the fourth shaft sleeve, 10 is the third connecting rod, 11 is the second connector, 1101 is the second groove plate, 1102 is the third support plate, 1103 is the fourth support plate, 1104 is the first upper connecting plate, 1105 is the first lower connecting plate, 1106 is the second connecting plate, 1107 is the fifth support plate, 1108 is the third connecting plate, 1111 is the third fulcrum, 1112 is the fourth fulcrum, 1113 is the fifth fulcrum, 1114 is the sixth fulcrum, 1115 is the seventh fulcrum, 12 is the first connecting rod, 1201 is the first rectangular tube body, and 1202 is the first shaft sleeve. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] The core of the present invention is to provide a new type of crank arm device, in which the first folding arm, the second folding arm, the first connecting rod and the second connecting rod are all arranged as an integral structure, so that the first folding arm, the second folding arm, the first connecting rod and the second connecting rod can be directly connected to the first connecting body and the second connecting body, avoiding the need for additional connecting parts on the first folding arm, the second folding arm, the first connecting rod and the second connecting rod, thereby ensuring the overall rigidity of the new crank arm device, which can meet the situation of increased lifting height and load-bearing capacity.

[0036] Please refer to Figures 1 to 8 .

[0037] like Figure 1 As shown, this specific embodiment discloses a novel crank arm device, including: an arm frame 1, a leveling cylinder 3, a main arm cylinder 2, a first connector 4 and a second connector 11, a first folding arm 5 and a second folding arm 9, a first connecting rod 12 and a second connecting rod, a folding arm cylinder 6, a third connecting rod 10 and a turntable 8; the first folding arm 5, the second folding arm 9, the first connecting rod 12 and the second connecting rod 7 are all integral structures, and the first folding arm 5 and the first connecting rod 12 are hinged at one end to the first connector 4 and at the other end to the second connector 11, the second folding arm 9 and the second connecting rod 7 are hinged at one end to the second connector 11 and at the other end to the turntable 8; one end of the third connecting rod 10 is hinged to the first folding arm 5, and the other end is hinged to the second folding arm 9;

[0038] One end of the leveling cylinder 3 and the main arm cylinder 2 are hinged to the first connector 4, and the other end is hinged to the boom 1. One end of the folding arm cylinder 6 is hinged to the second connector 11, and the other end is hinged to the first folding arm 5.

[0039] The first folding arm 5 is parallel to the first connecting rod 12 , and the second folding arm 9 is parallel to the second connecting rod 7 .

[0040] In the process of using the new crank arm device provided in this specific embodiment, the stability of the boom 1 is adjusted by the leveling cylinder 3, the angle of the boom 1 is adjusted by the main arm cylinder 2, and the angle between the two folding arms is adjusted by the folding arm cylinder 6 to adjust the angle of the boom 1.

[0041] Compared with the prior art, in the new crank arm device provided in this specific embodiment, the first folding arm 5, the second folding arm 9, the first connecting rod 12 and the second connecting rod 7 are all set as an integral structure, so that the first folding arm 5, the second folding arm 9, the first connecting rod 12 and the second connecting rod 7 are all set as an integral structure and can be directly connected to the first connecting body 4 and the second connecting body 11, without the need to additionally set a connecting ear plate 503 at the first folding arm 5, the second folding arm 9, the first connecting rod 12 and the second connecting rod 7 are all set as an integral structure. Compared with the method of welding the connecting ear plates 503 at both ends of the first folding arm 5, the second folding arm 9, the first connecting rod 12 and the second connecting rod 7 are all set as an integral structure in the prior art, the stiffness of the first folding arm 5, the second folding arm 9, the first connecting rod 12 and the second connecting rod 7 can be improved, thereby improving the overall stiffness of the new crank arm device, which can meet the situation of increased lifting height and carrying capacity.

[0042] like Figure 2 、 4 As shown, the first connecting rod 12 includes a first rectangular tube body 1201 and first shaft sleeves 1202 arranged at both ends of the first rectangular tube body 1201 in the longitudinal direction; the second connecting rod 7 includes a second connecting rod 7 body and second shaft sleeves 702 arranged at both ends of the second rectangular tube body 701 in the longitudinal direction.

[0043] Compared with the prior art, the first sleeve 1202 in this specific embodiment is directly fixed to the first rectangular tube body 1201, and the second sleeve 702 is directly fixed to the second rectangular tube body 701. Compared with the prior art, the axial length of the first sleeve 1202 and the second sleeve 702 can be effectively extended, and the force-bearing area of ​​the first sleeve 1202 and the second sleeve 702 during the use of the new crank arm device is increased. Moreover, the first rectangular tube body 1201 and the second rectangular tube body 701 are structures with uniform thickness along the length direction, and there is no need to specially set up a thinner structure for installing the first sleeve 1202 and the second sleeve 702, thereby improving the rigidity and strength of the new crank arm device.

[0044] like Figure 3 、 5 As shown, the first folding arm 5 includes a third rectangular tube body 501, and the third shaft sleeve 502 and the ear plate 503 on which the third shaft sleeve 502 is installed are respectively provided at both ends of the length direction of the third rectangular tube body 501; the second folding arm 9 includes a fourth rectangular tube body 901, and the fourth shaft sleeve 902 is provided at both ends of the length direction of the fourth rectangular tube body 901.

[0045] Preferably, the ear plate 503 on which the third shaft sleeve 502 is installed is an integrated structure with the third rectangular tube body 501 .

[0046] Compared with the prior art, the third shaft sleeve 502 provided in this specific embodiment is directly installed on the third rectangular tube body 501 or the ear plate 503, and the fourth shaft sleeve 902 is directly installed on the fourth rectangular tube body 901. Compared with the prior art, the axial length of the third shaft sleeve 502 and the fourth shaft sleeve 902 can be effectively extended, and the force-bearing area of ​​the third shaft sleeve 502 and the fourth shaft sleeve 902 during the use of the new crank arm device is increased. Moreover, the third rectangular tube body 501 and the fourth rectangular tube body 901 are both structures with uniform thickness along the length direction, and there is no need to specially set up a thinner structure for installing the third shaft sleeve 502 and the fourth shaft sleeve 902, thereby improving the rigidity and strength of the new crank arm device.

[0047] The first sleeve 1202 can be welded to the through hole in the first rectangular tube body 1201 for installing the first sleeve 1202, the second sleeve 702 can be welded to the through hole in the second rectangular tube body 701 for installing the second sleeve, one of the third sleeves 502 can be welded to the through hole in the third rectangular tube body 501 for installing the third sleeve 502, the other third sleeve 502 can be welded to the through hole in the ear plate 503 for installing the third sleeve 502, and the fourth sleeve 902 can be welded to the through hole in the fourth rectangular tube body 901 for installing the fourth sleeve 902.

[0048] The welding connection method makes the connection between the first sleeve 1202 and the first rectangular tube body 1201, the second sleeve 702 and the second rectangular tube body 701, the third sleeve 502 and the third rectangular tube body 501 or the ear plate 503, and the fourth sleeve 902 and the fourth rectangular tube body 901 more secure.

[0049] like Figure 6 As shown, the first connecting body 4 includes a first slot plate 401, a first support plate 402, a second support plate 403 and a connecting tube 404. The first support plates 402 are provided on both inner side walls of the first slot plate 401. The two oppositely arranged first support plates 402 are connected by a connecting tube 404. One end of the second support plate 403 is connected to the connecting tube 404, and the other end is connected to the first slot plate 401; the first connecting rod 12 is connected to the first fulcrum 411 of the inter-branch structure formed by the first slot plate 401 and the first support plate 402, and the first folding arm 5 is connected to the first slot plate 401 and the second support plate 403 to form a second fulcrum 412 of the inter-branch structure.

[0050] like Figure 6As shown, the first slot plate 401 and the first support plate 402 are provided with a through hole for hinged connection with the first connecting rod 12, and a pin is inserted into the through hole for hinged connection with the first connecting rod 12 and the first shaft sleeve 1202 in the first slot plate 401 and the first support plate 402, so that one end of the first connecting rod 12 is hingedly connected to the first fulcrum 411; the first slot plate 401 and the second support plate 403 are provided with a through hole for hinged connection with the first folding arm 5, and a pin is inserted into the through hole for hinged connection with the second connecting rod 7 and the third shaft sleeve 502 in the first slot plate 401 and the second support plate 403, so that one end of the second connecting rod 7 is hingedly connected to the second fulcrum 412.

[0051] Compared with the prior art, the first connecting body 4 in this specific embodiment forms a first fulcrum 411 and a second fulcrum 412 that can be directly hingedly connected to the first connecting rod 12 and the first folding arm 5 by setting a first groove plate 401, a first support plate 402, and a second support plate 403, thereby effectively improving the stiffness and strength at the connection position.

[0052] like Figure 7 As shown, in a specific embodiment, the second connector 11 includes a second slot plate 1101, two third support plates 1102, two fourth support plates 1103, and two fifth support plates 1107. The third support plates 1102, the fourth support plates 1103, and the fifth support plates 1107 are all located in the U-shaped structure and are symmetrically arranged with respect to the middle cross section in the width direction of the second slot plate 1101.

[0053] The third support plate 1102, the fourth support plate 1103, and the fifth support plate 1107 are sequentially arranged from both sides of the second slot plate 1101 in the width direction to the middle;

[0054] The second slot plate 1101 and the two third support plates 1102 are provided with a third fulcrum 1111 for connecting to the second connecting rod 7, a fourth fulcrum 1112 for connecting to the second folding arm 9 and a fifth fulcrum 1113 for connecting to the first folding arm 5. The third support plate 1102 and the fourth support plate 1103 are provided with a sixth fulcrum 1114 connected to the first connecting rod 12. The two fifth support plates 1107 are provided with a seventh fulcrum 1115 for connecting to the folding arm cylinder 6.

[0055] The second slot plate 1101 is a U-shaped structure with an opening at the bottom. The side walls of the U-shaped structure cooperate with the two third support plates 1102 respectively, and are each provided with a through hole for hingedly connecting to one end of the second connecting rod 7. The pin passes through the second slot plate 1101, the through hole in the third support plate 1102 for hingedly connecting to one end of the second connecting rod 7, and the second shaft sleeve 702 to form a third fulcrum 1111, so that one end of the second connecting rod 7 is hingedly connected to the second connecting body 11; the side walls of the U-shaped structure cooperate with the two third support plates 1102 respectively, and are each provided with a through hole for hingedly connecting to one end of the second folding arm 9. The fourth fulcrum 1112 is closer to the lower end of the second connecting body 11 than the third fulcrum 1111. The pin passes through the second slot plate 1101, the through hole in the third support plate 1102 for hingedly connecting to one end of the second folding arm 9, and the fourth shaft sleeve 902 to form a fourth fulcrum 1112, so that one end of the second folding arm 9 is hingedly connected to the second connecting body 11; The side walls of the U-shaped structure are respectively matched with the two third support plates 1102, and are each provided with a through hole for hinged connection with one end of the first folding arm 5. The pin passes through the second slot plate 1101, the through hole in the third support plate 1102 for hinged connection with one end of the first folding arm 5, and the third shaft sleeve 502, forming a fifth fulcrum 1113, so that one end of the first folding arm 5 is hingedly connected to the second connecting body 11; the fifth fulcrum 1113 is closer to the second fulcrum than the third fulcrum 1111 The upper portion of the connector 11 is provided with a third support plate 1102 and a fourth support plate 1103 arranged parallel to each other. Each of the third support plate 1102 and the fourth support plate 1103 is provided with a through hole for hinged connection with the first connecting rod 12. A pin passes through the through hole for hinged connection with the first connecting rod 12 in the third support plate 1102 and the fourth support plate 1103 and the first shaft sleeve 1202, forming a sixth fulcrum 1114, thereby hingedly connecting one end of the first connecting rod 12 to the second connector 11. The two fifth support plates 1107 are provided with through holes for hinged connection with the folding arm cylinder 6. A pin passes through the through hole for hinged connection with the folding arm cylinder 6 in the fifth support plate 1107 and the connection hole in the folding arm cylinder, thereby forming a seventh fulcrum 1115, thereby hingedly connecting the folding arm cylinder 6 to the second connector 11. The other end of the folding arm cylinder 6 is hingedly connected to the first folding arm 5.

[0056] Preferably, the second connector 11 also includes a first upper connecting plate 1104 and a first lower connecting plate 1105 connecting the third support plate 1102 and the side wall of the second trough plate 1101, a second connecting plate 1106 connecting the third support plate 1102 and the fourth support plate 1103, and a third connecting plate 1108 connecting the two fifth support plates 1107; so that the second connector 11 forms an open box structure, thereby improving its rigidity and supporting strength.

[0057] In a specific embodiment, if Figure 8As shown, the turntable 8 includes a bottom plate 806, a first vertical support plate 801 and a second vertical support plate 802, the first vertical support plate 801 and the second vertical support plate 802 are directly connected to the bottom plate 806, and the first vertical support plate 801 and the second vertical support plate 802 are arranged parallel to each other;

[0058] The first vertical support plate 801 and the second vertical support plate 802 are both provided with a first turntable fulcrum 811 for connecting to the second connecting rod 7 and a second turntable fulcrum 812 connected to the second folding arm 9 .

[0059] In this specific embodiment, the first vertical support plate 801 and the second vertical support plate 802 are both directly connected to the bottom plate 806 , which can effectively improve the supporting strength of the structure formed by the first vertical support plate 801 and the second vertical support plate 802 .

[0060] The first vertical support plate 801 and the second vertical support plate 802 are both provided with a through hole for hinged connection with the second connecting rod 7, and the pin shaft passes through the through hole for hinged connection with the second connecting rod 7 in the first vertical support plate 801 and the second vertical support plate 802 and the second shaft sleeve 702 to form a first turntable fulcrum 811; the first vertical support plate 801 and the second vertical support plate 802 are both provided with a through hole for hinged connection with the second folding arm 9, and the pin shaft passes through the through hole for hinged connection with the second folding arm 9 in the first vertical support plate 801 and the second vertical support plate 802 and the second shaft sleeve 702 to form a second turntable fulcrum 812.

[0061] The turntable 8 further includes at least one turntable connecting plate connecting the first vertical supporting plate 801 and the second vertical supporting plate 802 , so that the turntable 8 forms an open box structure.

[0062] like Figure 8 As shown, the turntable connecting plate includes a first turntable connecting plate 803 arranged on the rear side of the first vertical support plate 801 and the second vertical support plate 802, a second turntable connecting plate 804 and a third turntable connecting plate 805 arranged on the front side of the first vertical support plate 801 and the second vertical support plate 802. Of course, the number and setting position of the turntable connecting plates can also be other ways, which are determined according to actual conditions and will not be elaborated here.

[0063] Preferably, the projections of the first vertical support plate 801 and the second vertical support plate 802 onto the bottom plate 806 are completely located inside the bottom plate 806, or the projections of the first vertical support plate 801 and the second vertical support plate 802 onto the bottom plate 806 only occupy a partial area of ​​the bottom plate 806 to improve the stability of the turntable structure.

[0064] The first vertical support plate 801 and the second vertical support plate 802, the first connecting rod 12 and the second connecting rod 7, the first folding arm 5 and the second folding arm 9, the first turntable connecting plate 803, the second turntable connecting plate 804 and the third turntable connecting plate 805, the first rectangular tube body 1201 and the second rectangular tube body 701, the first shaft sleeve 1202, the second shaft sleeve 702, the third shaft sleeve 502 and the fourth shaft sleeve 902, the first fulcrum 411, the second fulcrum 412, the third fulcrum 1111, the fourth fulcrum 1112, the fifth fulcrum 1113, the sixth fulcrum 1114 and the seventh fulcrum 1115, the second connecting plate 1106 and the third connecting plate 1108 mentioned in this application document are only for distinguishing the different positions and there is no order of precedence.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Any combination of all the embodiments provided by the present invention is within the scope of protection of this invention and will not be described in detail here.

[0066] The above describes in detail the novel crank arm device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A new type of crank arm device, comprising: Boom (1), leveling cylinder (3), main arm cylinder (2), first connector (4) and second connector (11), first folding arm (5) and second folding arm (9), first connecting rod (12) and second connecting rod, folding arm cylinder (6), third connecting rod (10) and turntable (8); characterized in that, The first folding arm (5), the second folding arm (9), the first connecting rod (12) and the second connecting rod (7) are all integral structures, and the first folding arm (5) and the first connecting rod (12) are hinged at one end to the first connecting body (4) and at the other end to the second connecting body (11); the second folding arm (9) and the second connecting rod (7) are hinged at one end to the second connecting body (11) and at the other end to the turntable (8); one end of the third connecting rod (10) is hinged to the first folding arm (5) and at the other end to the second folding arm (9); The leveling cylinder (3) and the main arm cylinder (2) are both hinged at one end to the first connector (4) and hinged at the other end to the boom (1); the folding arm cylinder (6) is hinged at one end to the second connector (11) and hinged at the other end to the first folding arm (5); The first folding arm (5) is parallel to the first connecting rod (12), and the second folding arm (9) is parallel to the second connecting rod (7); The first connecting rod (12) comprises a first rectangular tube body (1201) and first shaft sleeves (1202) provided at both ends of the first rectangular tube body (1201) in the longitudinal direction; the second connecting rod (7) comprises a second connecting rod (7) body and second shaft sleeves (702) provided at both ends of the second rectangular tube body (701) in the longitudinal direction; The first folding arm (5) comprises a third rectangular tube body (501), and both ends of the third rectangular tube body (501) in the longitudinal direction are respectively provided with a third shaft sleeve (502) and an ear plate (503) on which the third shaft sleeve (502) is installed; the second folding arm (9) comprises a fourth rectangular tube body (901), and both ends of the fourth rectangular tube body (901) in the longitudinal direction are provided with a fourth shaft sleeve (902); The first shaft sleeve (1202) is welded to the first rectangular tube body (1201), the second shaft sleeve (702) is welded to the second rectangular tube body (701), one of the third shaft sleeves (502) is welded to the third rectangular tube body (501), the other third shaft sleeve (502) is welded to the ear plate (503), and the fourth shaft sleeve (902) is welded to the fourth rectangular tube body (901); The first connecting body (4) comprises a first slot plate (401), a first support plate (402), a second support plate (403) and a connecting pipe (404); the first support plates (402) are provided on both inner side walls of the first slot plate (401); the two oppositely arranged first support plates (402) are connected via the connecting pipe (404); one end of the second support plate (403) is connected to the connecting pipe (404), and the other end is connected to the first slot plate (401); the first connecting rod (12) is connected to a first fulcrum (411) of an inter-branch structure formed by the first slot plate (401) and the first support plate (402); the first folding arm (5) is connected to a second fulcrum (412) of the inter-branch structure formed by the first slot plate (401) and the second support plate (403); The turntable (8) comprises a bottom plate (806), a first vertical support plate (801) and a second vertical support plate (802), wherein the first vertical support plate (801) and the second vertical support plate (802) are both directly connected to the bottom plate (806), and the first vertical support plate (801) and the second vertical support plate (802) are arranged parallel to each other; The first vertical support plate (801) and the second vertical support plate (802) are both provided with a first turntable fulcrum (811) for connecting to the second connecting rod (7) and a second turntable fulcrum (812) connected to the second folding arm (9); The turntable (8) further comprises at least one turntable connecting plate connecting the first vertical supporting plate (801) and the second vertical supporting plate (802), so that the turntable (8) forms an open box structure.

2. The novel crank arm device according to claim 1 is characterized in that: The second connector (11) comprises a second slot plate (1101), two third support plates (1102), two fourth support plates (1103), and two fifth support plates (1107); the third support plates (1102), the fourth support plates (1103), and the fifth support plates (1107) are all located in a U-shaped structure and are symmetrically arranged with respect to a middle cross section in a width direction of the second slot plate (1101); The third support plate (1102), the fourth support plate (1103), and the fifth support plate (1107) are sequentially arranged from both sides in the width direction of the second slot plate (1101) toward the middle; The second slot plate (1101) and the two third support plates (1102) are provided with a third fulcrum (1111) for connecting to the second connecting rod (7), a fourth fulcrum (1112) for connecting to the second folding arm (9), and a fifth fulcrum (1113) for connecting to the first folding arm (5); the third support plate (1102) and the fourth support plate (1103) are provided with a sixth fulcrum (1114) for connecting to the first connecting rod (12); and the two fifth support plates (1107) are provided with a seventh fulcrum (1115) for connecting to the folding arm cylinder (6).

3. The novel crank arm device according to claim 2 is characterized in that: The second connector (11) further comprises a first upper connector plate (1104) and a first lower connector plate (1105) connecting the third support plate (1102) and the side wall of the second trough plate (1101), a second connector plate (1106) connecting the third support plate (1102) and the fourth support plate (1103), and a third connector plate (1108) connecting the two fifth support plates (1107); so that the second connector (111) forms an open box structure.

4. The novel crank arm device according to claim 1 is characterized in that: The projections of the first vertical support plate (801) and the second vertical support plate (802) onto the bottom plate (806) are completely located within the bottom plate (806).

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