Aerial work platform vehicle for glass installation

Abstract

A high-altitude work platform vehicle for glass installation includes a platform vehicle chassis, a rotating base, a lifting arm and a glass adsorption frame. The high-altitude work platform vehicle for glass installation also includes a coarse adjustment mechanism, a fine adjustment mechanism and an intermediate adjustment arm connected between the coarse adjustment mechanism and the fine adjustment mechanism. The coarse adjustment mechanism is simultaneously connected to the lifting arm, and the fine adjustment mechanism is simultaneously connected to the glass adsorption frame. The present invention combines the glass adsorption frame with an arm-type high-altitude work platform vehicle, specifically connecting the two through the coarse adjustment mechanism, the fine adjustment mechanism and the intermediate adjustment arm, to achieve automatic multi-directional steering and telescopic adjustment of the glass adsorption frame. Compared with previous operating equipment, the positioning range provided by the present invention is large enough and the positioning is accurate, which meets the adjustment requirements of the installation station when installing glass at high altitude, greatly reduces the labor intensity and operation requirements of workers, and improves convenience, safety and work efficiency. It is worthy of promotion and use in this field.

Description

Technical Field

[0001] The invention relates to the technical field of building glass installation, in particular to an aerial work platform vehicle for glass installation. Background Art

[0002] With the development of society, the application of glass curtain walls in modern high-rise buildings is becoming more and more widespread, especially in some buildings, where walls are directly replaced by glass. However, the glass used for the exterior walls or curtain walls of current buildings is relatively thick, fragile, and difficult to carry. As for the installation of large glass, it is generally done by manually installing multiple vacuum suction cups on a mounting frame, and then after the glass is adsorbed on the vacuum suction cup, the mounting frame and the glass are lifted up by a crane, and then the inclination and left and right position of the glass are manually adjusted to achieve installation. For example, a glass lifting device with application number CN201220022166.X includes a main frame, a suspension rod for connecting to a hanger is movably connected to the main frame, one or more vacuum suction cups for adsorbing glass are arranged on the main frame, the suction cups are connected to a vacuum adsorption system, the vacuum adsorption system includes a vacuum pump and an air path, and the main frame is also connected to a flipping mechanism for flipping and fixing the main frame.

[0003] In the traditional installation process, after the glass is moved to the installation wall, its installation angle and left and right position are basically adjusted manually, which has high requirements on the workers' operation and high labor intensity. Therefore, in order to enable the operator to effectively control the position of the glass, the overall area, weight and length of the glass are restricted. Especially when the length of the glass is greater than 5m, the first problem faced by the current lifting slings is that it is impossible to safely rotate the glass placed horizontally or sideways on the ground into a vertical state during the lifting process. In the aforementioned comparative documents, although a flip mechanism is added, it still relies on manual adjustment to a large extent; secondly, because the common glass lifting slings in the past have problems such as poor stability and serious influence of wind speed during operation, the fixed position needs to be adjusted frequently during the operation, resulting in high risk of manual installation of glass with the help of lifting tools, easy heatstroke during operation in high temperature weather, high labor intensity and low work efficiency. At present, the commonly used method in the construction field is to install a wall by combining multiple pieces of glass with a length of less than 3m. The disadvantage of this structure is that the glass often needs to be cut according to the actual situation, and there is a glue seam between the two, or it needs to be fixed multiple times through a positioning frame. The glue seam is prone to aging and water seepage during long-term exposure to wind and sun, which leads to the need for regular maintenance. In addition, in the process of connecting multiple pieces of glass in sequence, due to the characteristics of large-area glass itself, it is easy to cause collision and damage between the glasses during installation, and the glass cannot be completely connected evenly.

[0004] Therefore, how to provide a convenient and fast glass high-altitude installation solution with high installation precision and reduced worker operation requirements and labor intensity is a topic worth studying. After research, the applicant found that the existing aerial work platform vehicle is the preferred carrier to replace the traditional hoisting machine. The applicant itself also has sufficient development experience in this field, such as the patent document with application number CN202010061273.2 previously applied by the applicant, which discloses a kind of electric vehicle for articulated aerial work platform. Therefore, in view of the shortcomings of the existing technology, the applicant combined the existing aerial work platform vehicle structure and provided a solution. Summary of the invention

[0005] The technical purpose of the present invention is to provide an aerial work platform vehicle for glass installation, so as to solve the problems existing in the traditional glass lifting method, that is, the stability and safety are poor and the installation and adjustment of the glass completely rely on manual labor.

[0006] The specific technical solution of the present invention is as follows: A high-altitude work platform vehicle for glass installation, comprising a platform vehicle chassis, a rotating base, a lifting arm and a glass adsorption frame, the high-altitude work platform vehicle for glass installation also comprises a coarse adjustment mechanism, a fine adjustment mechanism and an intermediate adjustment arm connected between the coarse adjustment mechanism and the fine adjustment mechanism, the coarse adjustment mechanism is also connected to the lifting arm, and the fine adjustment mechanism is also connected to the glass adsorption frame.

[0007] Preferably, the coarse adjustment mechanism includes a first mounting seat, a second mounting seat, a first swing cylinder and a second swing cylinder, the first swing cylinder is mounted on the first mounting seat, the second swing cylinder is mounted on the second mounting seat, the first mounting seat is connected to the front end of the lifting arm, the second mounting seat is connected to the output end of the first swing cylinder, and the rear end of the intermediate adjustment arm is connected to the output end of the second swing cylinder.

[0008] Preferably, the rotation plane of the first swing cylinder is perpendicular to the rotation plane of the second swing cylinder; the first swing cylinder is vertically arranged with the rotation axis facing up and down in the first mounting seat, and the second swing cylinder is horizontally arranged with the rotation axis facing left and right in the second mounting seat.

[0009] Preferably, the front end of the lifting arm is hinged to the first mounting seat, and a fourth pushing cylinder is further provided at the front end of the lifting arm, and the output end of the fourth pushing cylinder is hinged to the first mounting seat.

[0010] Preferably, the fine adjustment mechanism includes a third mounting seat, a fourth mounting seat, a third swing cylinder, a fourth swing cylinder and a telescopic connecting seat connected between the third mounting seat and the fourth mounting seat, the third swing cylinder is mounted on the third mounting seat, the fourth swing cylinder is mounted on the fourth mounting seat, the telescopic connecting seat is connected to the output end of the third swing cylinder, the glass adsorption frame is connected to the output end of the fourth swing cylinder, the third mounting seat is connected to the front end of the intermediate adjustment arm, and the fourth mounting seat is connected to the telescopic connecting seat.

[0011] Preferably, the telescopic connecting seat comprises a fixed seat, a movable seat and a first pushing oil cylinder, the fixed seat is located above the movable seat, the movable seat is slidably connected to the fixed seat and can slide forward and backward relative to the fixed seat, the first pushing oil cylinder is installed on the fixed seat, the output end of the first pushing oil cylinder is connected to the movable seat, the output end of the third swing oil cylinder is connected to the fixed seat, and the fourth mounting seat is connected to the movable seat.

[0012] Preferably, the telescopic connecting seat also includes a second pushing cylinder, the fourth mounting seat is slidably connected to the movable seat and can slide left and right relative to the movable seat, the second pushing cylinder is installed on the movable seat, and the output end of the second pushing cylinder is connected to the fourth mounting seat.

[0013] Preferably, the rotation plane of the third swing cylinder is perpendicular to the rotation plane of the fourth swing cylinder; the third swing cylinder is horizontally arranged with the rotation axis facing forward and backward relative to the telescopic connecting seat, and the fourth swing cylinder is vertically arranged with the rotation axis facing upward and downward relative to the telescopic connecting seat.

[0014] Preferably, the intermediate adjusting arm comprises an outer arm, an inner arm and a third pushing cylinder, the inner arm is sleeved in the inner cavity of the outer arm and can be extended from the outer arm, the third pushing cylinder is installed on the outer arm, the inner arm has a connecting portion connected to the output end of the third pushing cylinder, the rear end of the outer arm is provided with a rear connecting portion, the rear connecting portion serves as the rear end of the intermediate adjusting arm and is connected to the coarse adjusting mechanism, the front end of the inner arm is provided with a front connecting portion, the front connecting portion serves as the front end of the intermediate adjusting arm and is connected to the fine adjusting mechanism.

[0015] Preferably, the front connecting part includes a fixed connecting head, a first movable rod, a second movable rod and a fifth pushing cylinder, the fixed connecting head is hinged to the third mounting seat, the first movable rod is hinged to the fixed connecting head, one end of the second movable rod is hinged to the first movable rod and the other end is hinged to the third mounting seat, the fifth pushing cylinder is installed at the front end of the inner arm, and the output end of the fifth pushing cylinder is hinged to the first movable rod or to the second movable rod or to the hinge axis of the first movable rod and the second movable rod.

[0016] The technical advantage of the present invention is that the aerial work platform vehicle for glass installation combines a glass adsorption frame with a boom-type aerial work platform vehicle, and specifically connects the two through a coarse adjustment mechanism, a fine adjustment mechanism and an intermediate adjustment arm, thereby realizing automatic multi-directional steering and telescopic adjustment of the glass adsorption frame. Compared with previous operating equipment, the positioning range it provides is large enough and the positioning is precise, which meets the adjustment requirements of the installation station when installing glass at high altitude, greatly reduces the labor intensity and operating requirements of workers, and improves convenience, safety and work efficiency. It is worthy of promotion and use in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of an adjustment state of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the local structure within the dotted box;

[0019] Figure 3 It is a structural schematic diagram of another adjustment state of an embodiment of the present invention;

[0020] Figure 4 for Figure 3 Schematic diagram of the local structure within the dotted box;

[0021] Figure 5 It is a schematic cross-sectional diagram of a local structure of an embodiment of the present invention;

[0022] The names of the parts corresponding to the numbers in the figure are: 1-platform vehicle chassis, 2-rotating base, 3-lifting arm, 4-glass adsorption frame, a1-first mounting seat, a2-second mounting seat, a3-first swing cylinder, a4-second swing cylinder, b1-third mounting seat, b2-fourth mounting seat, b3-third swing cylinder, b4-fourth swing cylinder, b5-fixed seat, b6-movable seat, b7-first pushing cylinder, b8-second pushing cylinder, c1-outer arm, c11-rear connecting part, c21-front connecting part, c2-inner arm, c3-third pushing cylinder. DETAILED DESCRIPTION

[0023] The present invention will be further described below by means of specific embodiments in conjunction with the accompanying drawings:

[0024] See Figure 1 , Figure 2 or Figure 3 , Figure 4 An embodiment of an aerial work platform vehicle for glass installation includes a platform vehicle chassis 1, a rotating base 2, a lifting arm 3 and a glass adsorption frame 4. The platform vehicle chassis 1, the rotating base 2 and the lifting arm 3 all adopt the structure of an existing boom-type aerial work platform vehicle. The aerial work platform vehicle for glass installation also includes a coarse adjustment mechanism, a fine adjustment mechanism and an intermediate adjustment arm connected between the coarse adjustment mechanism and the fine adjustment mechanism. The coarse adjustment mechanism is connected to the lifting arm 3 at the same time, and the fine adjustment mechanism is connected to the glass adsorption frame 4 at the same time.

[0025] Regarding the coarse adjustment mechanism, specifically, it includes a first mounting seat a1, a second mounting seat a2, a first swing oil cylinder a3 and a second swing oil cylinder a4. The first swing oil cylinder a3 is mounted on the first mounting seat a1, the second swing oil cylinder a4 is mounted on the second mounting seat a2, the first mounting seat a1 is connected to the front end of the lifting arm 3, the second mounting seat a2 is connected to the output end of the first swing oil cylinder a3, and the rear end of the intermediate adjustment arm is connected to the output end of the second swing oil cylinder a4.

[0026] Regarding the specific settings of the first swing cylinder a3 and the second swing cylinder a4, in this embodiment, the rotation plane of the first swing cylinder a3 is perpendicular to the rotation plane of the second swing cylinder a4, and the first swing cylinder a3 is vertically set with the rotation axis facing up and down in the first mounting seat a1, and the second swing cylinder a4 is horizontally set with the rotation axis facing left and right in the second mounting seat a2, that is, the first swing cylinder a3 rotates the entire second mounting seat a2 and the structure connected thereto to the left or right, while the second swing cylinder a4 rotates the entire middle adjusting arm and the structure connected thereto upward or downward, and these two swing cylinders are used to quickly move the glass adsorption rack 4 in a relatively large spatial range.

[0027] In addition, the front end of the lifting arm 3 is hinged to the first mounting seat a1, and the front end of the lifting arm 3 is also provided with a fourth push cylinder 31, and the output end of the fourth push cylinder 31 is hinged to the first mounting seat a1. It can be clearly seen from the figure that the back of the first mounting seat a1 and the front end of the lifting arm 3 have matching hinged parts, and the fourth push cylinder 31 is also arranged at the front center of the lifting arm 3, and the back of the first mounting seat a1 is provided with a docking cross bar, and the output end of the fourth push cylinder 31 is hinged to the docking cross bar. The fourth push cylinder 31 and the hinged structure here provide an additional degree of adjustment, driving the entire structure thereafter to rotate upward or downward within a certain angle range.

[0028] Regarding the fine adjustment mechanism, specifically, it includes a third mounting seat b1, a fourth mounting seat b2, a third swing oil cylinder b3, a fourth swing oil cylinder b4 and a retractable connection seat connected between the third mounting seat b1 and the fourth mounting seat b2. The third swing oil cylinder b3 is mounted on the third mounting seat b1, the fourth swing oil cylinder b4 is mounted on the fourth mounting seat b2, the retractable connection seat is connected to the output end of the third swing oil cylinder b3, the glass adsorption frame 4 is connected to the output end of the fourth swing oil cylinder b4, the third mounting seat b1 is connected to the front end of the intermediate adjustment arm, and the fourth mounting seat b2 is connected to the retractable connection seat. The swing oil cylinder here is naturally also used for steering adjustment. Further, it is also combined with a retractable connection seat to adjust the linear extension or retreat. Since the fine adjustment mechanism is a direct connection part with the glass adsorption frame 4, after the rough adjustment mechanism performs rough adjustment positioning (generally, the glass has been moved to the vicinity of the installation location), it performs more detailed fine adjustment positioning on the glass adsorption frame 4 in a relatively small space range to find the final accurate installation position.

[0029] Regarding the retractable connecting seat, specifically, it includes a fixed seat b5, a movable seat b6, a first pushing cylinder b7 and a second pushing cylinder b8. In this embodiment, the fixed seat b5 and the movable seat b6 are both in the form of plates, the fixed seat b5 is located above the movable seat b6, the upper part of the fixed seat b5 is connected to the third swing cylinder b3, the movable seat b6 is connected to the fourth mounting seat b2, the movable seat b6 is slidably connected to the fixed seat b5 and can slide forward and backward relative to the fixed seat b5, the first pushing cylinder b7 is installed on the fixed seat b5, and the output end of the first pushing cylinder b7 is connected to the movable seat b6. Regarding the sliding connection method, specifically, in this embodiment, two left and right slide bars are provided on the lower surface of the fixed seat b5, and a slide groove portion matching the slide bar is provided on the upper surface of the movable seat b6, the groove type is a dovetail groove, and the shape of the slide bar is an "I" shape.

[0030] In addition, the fourth mounting seat b2 is also slidably connected to the movable seat b6. The fourth mounting seat b2 can slide left and right relative to the movable seat b6. The second push oil cylinder b8 is installed on the movable seat b6, and the output end of the second push oil cylinder b8 is connected to the fourth mounting seat b2. As can be seen from the figure, the movable seat b6 is a little larger than the fixed seat b5. The setting mode of the sliding connection is selected as follows: a front vertical mounting surface is provided on the movable seat b6, and two upper and lower slide bars are provided on the mounting surface. The back of the fourth mounting seat b2 is provided with a slide groove part matching the slide bar. The groove type is also a dovetail groove, and the shape of the slide bar is also an "I" shape. The second push oil cylinder b8 is located in the middle of the two slide bars on the mounting surface.

[0031] Regarding the specific settings of the third swing cylinder b3 and the fourth swing cylinder b4, in this embodiment, the rotation plane of the third swing cylinder b3 is perpendicular to the rotation plane of the fourth swing cylinder b4, the third swing cylinder b3 is a horizontal setting of the rotation axis relative to the front and rear direction of the telescopic connecting seat, and the fourth swing cylinder a4 is a vertical setting of the rotation axis relative to the up and down direction of the telescopic connecting seat, that is, the third swing cylinder b3 rotates the entire telescopic connecting seat and the structure connected thereto to the left or right, while the fourth swing cylinder b4 directly controls the glass adsorption frame 4 to rotate around the rotation axis of the fourth swing cylinder b4 itself.

[0032] Therefore, from the detailed description of the fine adjustment mechanism, it provides relatively richer adjustment content, including rotation adjustment in two directions and linear adjustment in two directions, which can be used as sufficient supplementary adjustment after the coarse adjustment mechanism is activated. In addition to the coarse and fine adjustment mechanisms, there is also an intermediate adjustment arm connected between the two, which not only plays a connecting role, but also plays an additional adjustment role.

[0033] Regarding the intermediate adjustment arm, specifically, it includes an outer arm c1, an inner arm c2 and a third push cylinder c3. The inner arm c2 is sleeved in the inner cavity of the outer arm c1 and can be extended from the front end of the outer arm c1. The third push cylinder c3 is installed on the outer arm c1. The inner arm c2 has a connection part connected to the output end of the third push cylinder c3. The rear end of the outer arm c1 is provided with a rear connection part c11, which is connected to the rough adjustment mechanism as the rear end of the intermediate adjustment arm. The front end of the inner arm c2 is provided with a front connection part c21, which is connected to the fine adjustment mechanism as the front end of the intermediate adjustment arm. The inner arm c2 sleeved in the outer arm c1 can be extended or retracted relative to the outer arm c1 through the third push cylinder c3, which drives the entire fine adjustment mechanism connected to the inner arm c2 to move forward or backward, providing another adjustment degree to meet the needs of glass installation and positioning.

[0034] In addition, the front connecting portion c21 is also rotatably connected to the third mounting seat b1. Figure 5The front connecting part c21 includes a fixed connecting head c211, a first movable rod c212, a second movable rod c213 and a fifth pushing cylinder c214. The fixed connecting head c211 is hinged to the third mounting seat b1. The first movable rod c212 is hinged to the fixed connecting head c211. One end of the second movable rod c213 is hinged to the first movable rod c212 and the other end is hinged to the third mounting seat b1. The fifth pushing cylinder c214 is installed at the front end of the inner arm c2. The output end of the fifth pushing cylinder c214 is hinged to the first movable rod c212 or to the second movable rod c213 or to the hinge axis of the first movable rod c212 and the second movable rod c213. It can be clearly understood from the figure that the fixed connection head c211 is a connection part with two side plates, the back of the third mounting seat b1 is provided with two upper and lower hinge shafts, the head ends of the two side plates are hinged with the upper hinge shaft of the back of the third mounting seat b1, the second movable rod c213 is provided with left and right sections and is hinged with the lower hinge shaft of the back of the third mounting seat b1; the head ends of the two side plates are also provided with a hinge shaft at the back, the first movable rod c212 is provided with a section, one end of which is hinged with the hinge shaft at the back of the head ends of the two side plates, and the other end is hinged with the second movable rod c213 through another independent hinge shaft, and the output end of the fifth push oil cylinder c214 is hinged with the another independent hinge shaft. The fifth push oil cylinder c214 itself is fixedly connected to the inner arm c2. In this embodiment, the inner arm c2 has an installation inner cavity, and the fifth push oil cylinder c214 is installed in the installation inner cavity. The structural design of the front connecting part c21 also provides an additional degree of adjustment, driving the entire structure behind it to rotate upward or downward within a certain angle range. Figure 1 , Figure 2 and Figure 3 , Figure 4 The two sets of figures not only show the second swing cylinder a4 turning over 90 degrees, but also show the front connecting part c21 turning over 90 degrees.

[0035] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. An aerial work platform vehicle for glass installation, comprising a platform vehicle chassis (1), a rotating base (2), a lifting arm (3) and a glass adsorption frame (4), characterized in that: The aerial work platform vehicle for glass installation further comprises a coarse adjustment mechanism, a fine adjustment mechanism and an intermediate adjustment arm connected between the coarse adjustment mechanism and the fine adjustment mechanism, the coarse adjustment mechanism is simultaneously connected to the lifting arm (3), and the fine adjustment mechanism is simultaneously connected to the glass adsorption frame (4); The fine adjustment mechanism comprises a third mounting seat (b1), a fourth mounting seat (b2), a third swing cylinder (b3), a fourth swing cylinder (b4) and a telescopic connecting seat connected between the third mounting seat (b1) and the fourth mounting seat (b2), the third swing cylinder (b3) being mounted on the third mounting seat (b1), the fourth swing cylinder (b4) being mounted on the fourth mounting seat (b2), the telescopic connecting seat being connected to an output end of the third swing cylinder (b3), the glass adsorption frame (4) being connected to an output end of the fourth swing cylinder (b4), the third mounting seat (b1) being connected to a front end of the intermediate adjustment arm, and the fourth mounting seat (b2) being connected to the telescopic connecting seat; The telescopic connecting seat comprises a fixed seat (b5), a movable seat (b6) and a first pushing cylinder (b7); the fixed seat (b5) is located above the movable seat (b6); the movable seat (b6) is slidably connected to the fixed seat (b5) and can slide forward and backward relative to the fixed seat (b5); the first pushing cylinder (b7) is installed on the fixed seat (b5); the output end of the first pushing cylinder (b7) is connected to the movable seat (b6); the output end of the third swinging cylinder (b3) is connected to the fixed seat (b5); and the fourth mounting seat (b2) is connected to the movable seat (b6); The telescopic connecting seat also includes a second pushing cylinder (b8), the fourth mounting seat (b2) is slidably connected to the movable seat (b6) and can slide leftward and rightward relative to the movable seat (b6), the second pushing cylinder (b8) is installed on the movable seat (b6), and the output end of the second pushing cylinder (b8) is connected to the fourth mounting seat (b2); The rotation plane of the third swing oil cylinder (b3) is perpendicular to the rotation plane of the fourth swing oil cylinder (b4); the third swing oil cylinder (b3) is horizontally arranged with its rotation axis facing forward and backward relative to the telescopic connecting seat, and the fourth swing oil cylinder (a4) is vertically arranged with its rotation axis facing upward and downward relative to the telescopic connecting seat; The coarse adjustment mechanism comprises a first mounting seat (a1), a second mounting seat (a2), a first swinging oil cylinder (a3) ​​and a second swinging oil cylinder (a4); the first swinging oil cylinder (a3) ​​is mounted on the first mounting seat (a1), the second swinging oil cylinder (a4) is mounted on the second mounting seat (a2), the first mounting seat (a1) is connected to the front end of the lifting arm (3), the second mounting seat (a2) is connected to the output end of the first swinging oil cylinder (a3), and the rear end of the intermediate adjustment arm is connected to the output end of the second swinging oil cylinder (a4); The rotation plane of the first swing cylinder (a3) ​​is perpendicular to the rotation plane of the second swing cylinder (a4); the first swing cylinder (a3) ​​is vertically arranged in the first mounting seat (a1) with the rotation axis facing up and down, and the second swing cylinder (a4) is horizontally arranged in the second mounting seat (a2) with the rotation axis facing left and right; The front end of the lifting arm (3) is hinged to the first mounting seat (a1), and a fourth pushing cylinder (31) is also installed at the front end of the lifting arm (3), and the output end of the fourth pushing cylinder (31) is hinged to the first mounting seat (a1); The intermediate adjustment arm comprises an outer arm (c1), an inner arm (c2) and a third pushing cylinder (c3); the inner arm (c2) is sleeved in the inner cavity of the outer arm (c1) and can extend from the outer arm (c1); the third pushing cylinder (c3) is mounted on the outer arm (c1); the inner arm (c2) has a connecting portion connected to the output end of the third pushing cylinder (c3); a rear end of the outer arm (c1) is provided with a rear connecting portion (c11); the rear connecting portion (c11) is connected to the coarse adjustment mechanism as the rear end of the intermediate adjustment arm; a front connecting portion (c21) is provided at the front end of the inner arm (c2); the front connecting portion (c21) is connected to the fine adjustment mechanism as the front end of the intermediate adjustment arm; The front connecting part (c21) includes a fixed connecting head (c211), a first movable rod (c212), a second movable rod (c213) and a fifth pushing cylinder (c214); the fixed connecting head (c211) is hinged to the third mounting seat (b1); the first movable rod (c212) is hinged to the fixed connecting head (c211); one end of the second movable rod (c213) is hinged to the first movable rod (c212) and the other end is hinged to the third mounting seat (b1); the fifth pushing cylinder (c214) is installed at the front end of the inner arm (c2); the output end of the fifth pushing cylinder (c214) is hinged to the first movable rod (c212) or the second movable rod (c213) or the hinge axis of the first movable rod (c212) and the second movable rod (c213).

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