Trestle capable of being used for tunnel waterproof construction

Abstract

The trestle bridge capable of being used for tunnel waterproof construction comprises a main bridge, longitudinal moving guide rails are arranged on the two transverse sides of the main bridge, a moving trolley is arranged on the longitudinal moving guide rails, the moving trolley is connected with an operation platform, and a winding drum, a pressing mechanism and a mechanical arm are arranged on the operation platform. The movable trolley drives the working platform, the winding drum, the pressing mechanism and the mechanical arm on the working platform to move in the longitudinal direction, constructors operate on the working platform, waterproof coiled materials such as geotechnical cloth and waterproof plates can be arranged on the winding drum, manual lifting and carrying are not needed, the labor intensity of the constructors and the operation difficulty are reduced, use is safer and more convenient, and the construction efficiency is improved. After the geotechnical cloth and the waterproof plate are pulled out of the winding drum and the installation positions are determined, the pressing mechanism can press the geotechnical cloth and the waterproof plate on the side wall to avoid falling off, the nail gun, the pressure welding mechanism and the creeping welding machine are sequentially installed on the mechanical arm, the mechanical arm is used for driving the construction tool to move to complete the corresponding working procedures, and the automation degree of waterproof roll construction is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a trestle bridge for tunnel waterproof construction. BACKGROUND

[0002] In the current tunnel construction, the tunnel side wall waterproof board laying is the key of tunnel waterproof, and the construction quality of the waterproof board is crucial to the overall waterproof effect of the tunnel. The side wall waterproof board is often laid longitudinally, and in the past, the waterproof board is constructed by means of inclined ladder or directly setting platform. Due to the large curvature and steep slope of the connection part between the side wall and the inverted arch, the setting operation platform has the following defects: 1. The waterproof board needs to be lifted and laid by manual during laying, which increases the labor intensity of the construction personnel, increases the operation difficulty and safety risk, and thus affects the construction quality of the side wall waterproof; 2. The waterproof board cannot be fixed in time and is easy to fall off, which greatly affects the subsequent fixing work; 3. The waterproof board cannot be accurately positioned and installed; 4. The operation platform has a single function, which only provides a standing platform for the construction personnel. SUMMARY

[0003] The utility model solves the technical problem of overcoming the prior art, and provides a trestle bridge for tunnel waterproof construction, which has high automation, is convenient to use, and is beneficial to improving the construction efficiency and quality.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A trestle bridge for tunnel waterproof construction, comprising a main bridge, the main bridge is provided with longitudinal moving guide rails on the two sides in the transverse direction, a moving trolley is arranged on the longitudinal moving guide rails, the moving trolley is connected with an operation platform, a winding drum for placing waterproof coiled material, a pressing mechanism for pressing the waterproof coiled material on the tunnel side wall, and a mechanical arm for installing the construction tool of the waterproof coiled material are arranged on the operation platform.

[0006] As a further improvement of the above technical scheme: the winding drum, the pressing mechanism and the mechanical arm are arranged in sequence in the longitudinal direction.

[0007] As a further improvement of the above technical scheme: a guide roller and a plurality of supporting rollers are arranged between the winding drum and the mechanical arm, the guide roller and the winding drum are arranged in the vertical direction, and the supporting rollers are arranged in the horizontal direction, and the plurality of supporting rollers are arranged in the longitudinal direction.

[0008] As a further improvement of the above technical scheme: a first limiting piece is arranged in parallel on one side of the guide roller, and a gap is formed between the first limiting piece and the guide roller for the waterproof coiled material to pass through.

[0009] And / or, the support roller is located on the side of the work platform away from the main bridge, and a second limiting piece is arranged on the end of the support roller away from the work platform.

[0010] As a further improvement of the above technical solution: the pressing mechanism comprises a pressing support and a pressing roller arranged on the pressing support, and the pressing support is hinged to the work platform to realize up-down overturning.

[0011] As a further improvement of the above technical solution: the winding drum is hinged to the work platform to realize up-down overturning.

[0012] As a further improvement of the above technical solution: a lifting seat and a lifting driving piece for driving the lifting seat to lift are arranged on the work platform, and the winding drum is arranged on the lifting seat.

[0013] As a further improvement of the above technical solution: a guide column is arranged on the lifting seat, and a guide sleeve is arranged on the work platform, and the guide column is arranged in the guide sleeve.

[0014] As a further improvement of the above technical solution: a liftable auxiliary platform is arranged on the work platform, the auxiliary platform and the winding drum are arranged at the longitudinal two ends of the work platform respectively, and the mechanical arm is detachably arranged on the auxiliary platform.

[0015] As a further improvement of the above technical solution: a first mounting seat is arranged on the moving trolley, a second mounting seat is arranged between the first mounting seat and the work platform, a first telescopic driving piece and a first linkage assembly are arranged between the first mounting seat and the second mounting seat, one end of the first telescopic driving piece is hinged to the first mounting seat, the other end is hinged to the second mounting seat, and the first linkage assembly comprises two first linkages arranged in parallel, one end of the first linkage is hinged to the first mounting seat, and the other end is hinged to the second mounting seat.

[0016] As a further improvement of the above technical solution: a second telescopic driving piece and a second linkage assembly are arranged between the second mounting seat and the work platform, one end of the second telescopic driving piece is hinged to the second mounting seat, the other end is hinged to the work platform, the second linkage assembly comprises two second linkages arranged in parallel, one end of the second linkage is hinged to the second mounting seat, and the other end is hinged to the work platform.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The utility model discloses a trestle bridge for tunnel waterproof construction, and the mobile trolley can drive the operation platform, the reel, the compacting mechanism and the mechanical arm to move integrally along the longitudinal direction, and does not affect other vehicles and construction equipment to pass through the main bridge, and the construction personnel can operate on the operation platform, and the geotextile, waterproof board and other waterproof coiled material can be arranged on the reel, so as to not need manual lifting and carrying, and the utility model is favorable for reducing the labor intensity and operation difficulty of construction personnel, and is safer and more convenient to use, after the geotextile and waterproof board are pulled out from the reel and the installation position is determined, the compacting mechanism can compact them on the side wall, avoids falling off, and through installing the nail gun, the pressure welding mechanism and the welding machine in succession on the mechanical arm, the corresponding process can be completed by using the mechanical arm to drive the construction tool to move, the automation degree of waterproof coiled material construction can be improved greatly, and then the construction efficiency and quality are favorable for improving, and the number of required construction personnel is reduced.

[0019] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. DRAWINGS

[0020] Figure 1 It is the main view structural schematic drawing of the trestle bridge for tunnel waterproof construction of the utility model.

[0021] Figure 2 It is the three-dimensional structure schematic drawing of the operation platform in the utility model.

[0022] Figure 3 It is the main view structural schematic drawing of the operation platform in the utility model.

[0023] Figure 4 It is the overhead structure schematic drawing of the operation platform in the utility model.

[0024] Figure 5 It is the overhead structure schematic drawing when being used for laying geotextile in the utility model.

[0025] Figure 6 It is the overhead structure schematic drawing when being used for fixing geotextile in the utility model.

[0026] Figure 7 It is the overhead structure schematic drawing when being used for laying waterproof board in the utility model.

[0027] Figure 8 It is the overhead structure schematic drawing when being used for welding waterproof board in the utility model.

[0028] Figure 9 It is the overhead structure schematic drawing when being used for welding waterproof board ring joint in the utility model.

[0029] The various reference numerals in the drawings represent:

[0030] 1, main bridge; 11, longitudinal displacement guide rail; 2, moving trolley; 21, first mounting seat; 22, second mounting seat; 23, first telescopic driving part; 24, first connecting rod assembly; 241, first connecting rod; 25, second telescopic driving part; 26, second connecting rod assembly; 261, second connecting rod; 3, operation platform; 31, winding drum; 32, pressing mechanism; 321, pressing support; 322, pressing roller; 33, mechanical arm; 34, guide roller; 341, first limiting part; 35, supporting roller; 351, second limiting part; 36, lifting seat; 361, guide column; 37, guide sleeve; 38, auxiliary platform; 4, waterproof roll material; 5, nail gun; 6, pressure welding mechanism; 7, welding machine. DETAILED DESCRIPTION

[0031] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "assembly", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The present application will be further described in detail below in combination with the drawings and specific embodiments of the present application.

[0035] Figures 1 to 4The utility model discloses a kind of tunnel waterproof construction trestle bridges for being used, and the tunnel waterproof construction trestle bridge of the embodiment, including main bridge 1, main bridge 1 transverse two sides are equipped with longitudinal moving guide rail 11, longitudinal moving guide rail 11 is equipped with moving trolley 2, moving trolley 2 is connected with operation platform 3, operation platform 3 is equipped with the reel 31 for placing waterproofing membrane 4, the compaction mechanism 32 for compacting waterproofing membrane 4 on tunnel side wall and the mechanical arm 33 for installing the construction tool of waterproofing membrane 4.Wherein, transverse is the width direction of tunnel, Figure 1 Middle is left-right direction, correspondingly, longitudinal direction is the length direction of tunnel, Figure 1 Middle is vertical paper direction;Preferably, mechanical arm 33 uses the mechanical arm with multiple rotary degrees of freedom, facilitate to drive construction tool movement.

[0036] The tunnel waterproof construction trestle bridge of the embodiment, moving trolley 2 can drive operation platform 3 and reel 31, compaction mechanism 32 and mechanical arm 33 etc. on it whole longitudinal movement, and do not affect other vehicles, construction equipment from main bridge 1 pass, construction personnel can operate on operation platform 3, geotextile, waterproof board etc. waterproofing membrane 4 can be arranged on reel 31, so as not to manually lift, transport, be favorable for reducing construction personnel labor intensity and operation difficulty, use safer, convenient, geotextile, waterproof board is pulled out from reel 31 and determines installation position, and compaction mechanism 32 can be compacted on side wall, avoid falling off, by successively installing nail gun 5, pressure welding mechanism 6, welding machine 7 etc. construction tool on mechanical arm 33, drive construction tool movement using mechanical arm 33, corresponding process can be completed, can substantially improve the automation degree of waterproofing membrane 4 construction, in turn be favorable for improving construction efficiency and quality, while reducing the number of required construction personnel.

[0037] Specifically refer to Figure 2 And Figure 4 In the embodiment, reel 31, compaction mechanism 32 and mechanical arm 33 are sequentially arranged along longitudinal direction.Waterproofing membrane 4 is pulled out from reel 31 and determines good laying position, and compaction mechanism 32 is compacted on side wall, avoid falling off, then mechanical arm 33 drives construction tool to construct, overall layout is reasonable, compact structure.

[0038] Further, in the embodiment, a guide roller 34 and a plurality of support rollers 35 are arranged between the winding drum 31 and the mechanical arm 33. The guide roller 34 and the winding drum 31 are both arranged vertically, and the support rollers 35 are arranged horizontally and longitudinally. The guide roller 34 can provide a guide for the waterproof coiled material 4, helping to determine the position of the pulled-out waterproof coiled material 4 and avoid unnecessary movement. The support rollers 35 can provide support for the waterproof coiled material 4, facilitating the pulling-out of the waterproof coiled material 4 and avoiding falling downward. The guide roller 34 and the support roller 35 can rotate around their own axes under the driving of the waterproof coiled material 4, which is conducive to reducing the frictional resistance when the waterproof coiled material 4 is pulled out, and the structure is reasonable and effective. Preferably, the guide roller 34 and the support roller 35 are arranged between the winding drum 31 and the pressing mechanism 32. After the waterproof coiled material 4 is pulled out by a certain length along the guide roller 34 and the support roller 35, the pressing mechanism 32 is used for pressing, and the layout is reasonable.

[0039] Further, in the embodiment, a first limiting piece 341 is arranged parallel to one side of the guide roller 34, and a gap is formed between the first limiting piece 341 and the guide roller 34 for the waterproof coiled material 4 to pass through. Preferably, the first limiting piece 341 may, for example, be a limiting roller, which can better limit the position of the waterproof coiled material 4 and avoid unnecessary movement.

[0040] And / or, the support roller 35 is located on the side of the working platform 3 away from the main bridge 1, and a second limiting piece 351 is arranged on the end of the support roller 35 away from the working platform 3. Preferably, the second limiting piece 351 may, for example, be a limiting plate, a limiting rod, etc., and the second limiting piece 351 does not rotate with the support roller 35 (for example, a support rod is arranged on the working platform 3, the second limiting piece 351 is fixedly arranged on the support rod, and the support roller 35 is rotatably sleeved on the support rod), which can better limit the position of the waterproof coiled material 4 and avoid unnecessary movement.

[0041] Further, in the embodiment, the pressing mechanism 32 includes a pressing support 321 and a pressing roller 322 arranged on the pressing support 321. The pressing support 321 can be hingedly connected to the working platform 3 to realize up-down flipping; or the pressing support 321 can be slidingly connected to the working platform 3 to realize telescoping (for example, a guide sleeve 37 cooperates with a guide column 361, or a sliding rail cooperates with a sliding block, a roller, etc.), both of which can achieve the purpose of pressing the pulled-out waterproof coiled material 4. When the pressing roller 322 contacts the waterproof coiled material 4, it can rotate around its own axis, thereby reducing the frictional resistance between the pressing roller 322 and the waterproof coiled material 4 and avoiding deformation and damage to the waterproof coiled material 4, and the structure is reasonable and effective.

[0042] Further, in the embodiment, the winding drum 31 is hinged to the working platform 3 to realize the up-down overturning. Since the waterproof roll 4 has a high height and a large weight, when the waterproof roll 4 is installed on the winding drum 31, the winding drum 31 can be first overturned to a horizontal state, so that the installation difficulty is greatly reduced, and the installation can be manually performed without the aid of hoisting equipment. After the waterproof roll 4 is installed on the winding drum 31, the winding drum 31 is overturned to a vertical state, so that the paving is facilitated, and the structure is simple and effective.

[0043] Specifically referring to Figure 3 In the embodiment, the working platform 3 is provided with a lifting seat 36 and a lifting driving member (not shown in the figure, for example, an oil cylinder, an electric cylinder, a gear and rack mechanism, etc., which will not be described in detail) for driving the lifting seat 36 to lift, and the winding drum 31 is arranged on the lifting seat 36. The lifting driving member can drive the lifting seat 36 and the winding drum 31 to lift as a whole, so as to finely adjust the height of the waterproof roll 4 and make the paving position closer to the geotextile and the waterproof board.

[0044] Further, in the embodiment, the lifting seat 36 is provided with a guide column 361, the working platform 3 is provided with a guide sleeve 37, and the guide column 361 is arranged in the guide sleeve 37. The guide sleeve 37 cooperates with the guide column 361 to provide a guide function for the lifting of the lifting seat 36, so that the lifting process is more stable and smooth.

[0045] Further, in the embodiment, the working platform 3 is provided with a liftable auxiliary platform 38, the auxiliary platform 38 and the winding drum 31 are arranged at the longitudinal two ends of the working platform 3, and the mechanical arm 33 is detachably arranged on the auxiliary platform 38. If necessary, the mechanical arm 33 on the auxiliary platform 38 can also be removed, the construction personnel stand on the auxiliary platform 38 and adjust the height through the lifting movement, so as to better approach the area that needs manual operation, and further improve the convenience.

[0046] Specifically referring to Figure 1 and Figure 2 In the embodiment, the mobile trolley 2 is provided with a first mounting seat 21, the first mounting seat 21 and the working platform 3 are provided with a second mounting seat 22, the first mounting seat 21 and the second mounting seat 22 are provided with a first telescopic driving member 23 (for example, an air cylinder, an oil cylinder, an electric cylinder, etc.) and a first linkage assembly 24, one end of the first telescopic driving member 23 is hinged to the first mounting seat 21, the other end is hinged to the second mounting seat 22, and the first linkage assembly 24 includes two first linkages 241 arranged in parallel, one end of the first linkage 241 is hinged to the first mounting seat 21, and the other end is hinged to the second mounting seat 22;

[0047] The second mounting base 22 is provided with a second telescopic driving member 25 (such as a pneumatic cylinder, an oil cylinder, an electric cylinder, etc.) and a second linkage assembly 26 between the working platform 3, one end of the second telescopic driving member 25 is hinged to the second mounting base 22, the other end is hinged to the working platform 3, the second linkage assembly 26 comprises two second linkages 261 arranged in parallel, one end of the second linkage 261 is hinged to the second mounting base 22, the other end is hinged to the working platform 3.

[0048] The telescopic movement of the first telescopic driving member 23 can drive the second mounting base 22 to lift and move laterally at the same time, and the first linkage assembly 24 can keep the posture of the second mounting base 22 during the movement to avoid overturning; the telescopic movement of the second telescopic driving member 25 can drive the working platform 3 to lift and move laterally at the same time, and the second linkage assembly 26 can keep the posture of the working platform 3 during the movement to avoid overturning, so that the working platform 3 has two-stage lifting and lateral movement functions, which facilitates the driving of the working platform 3 to approach the construction position of the geotextile and the waterproof board Figure 1 The working platform 3 on the left side is in a folded and contracted state, and the working platform 3 on the right side is in an extended state, which is used for waterproof construction, and the structure is reasonable

[0049] The construction method of the trestle for tunnel waterproof construction can be used as follows:

[0050] Specifically referring to Figure 5 , the geotextile is laid: the geotextile is first installed on the winding drum 31, the working platform 3 is driven to approach the installation position of the geotextile through the telescopic movement of the first telescopic driving member 23 and the second telescopic driving member 25, and the geotextile is pressed onto the side wall by the pressing mechanism 32 after being pulled out and positioned.

[0051] Specifically referring to Figure 6 , the nail gun is installed on the mechanical arm 33, and the assembly composed of the hot melt pad, the metal pad and the nail is used to fix the geotextile, the hot melt pads are arranged in a plum blossom type, and the geotextile is fixed by the nails in sequence, and the laser positioner can be used to ensure the uniform distribution of the geotextile on the sprayed concrete surface, so that the geotextile is tightly attached, and the laying is smooth, without bulges and wrinkles.

[0052] Specifically referring to Figure 7 , the waterproof board is laid: the winding drum 31 is turned to a horizontal state, the waterproof board coiled material can be conveniently inserted by manual work, the winding drum 31 is turned upward to a vertical state or continues to be inclined to the tunnel side wall at a certain angle after the installation of the waterproof board coiled material is completed. The waterproof board is pulled out along the guide drum 34 and the supporting drum 35 by the construction personnel, and the waterproof board is laid.

[0053] Specifically referring to Figure 8The nail gun 5 on the mechanical arm 33 is replaced by the pressure welding mechanism 6, the hot melt pad of each hot melt pad is heated by using an automatic electric hot melting pressure welder, a heat insulation pad layer can be used between the pressure welder and the waterproof plate to prevent the waterproof plate from being damaged when heated, and the waterproof plate is welded on the hot melt pad fixed with the geotextile.

[0054] Specifically refer to Figure 9 After the waterproof plate is fixed, the pressure welding mechanism 6 on the mechanical arm 33 is replaced by the welding machine 7, the mechanical arm 33 is adjusted in height, and the automatic welding machine is used to weld the circumferential seam of the waterproof plate.

[0055] Although the utility model has disclosed as above with preferable embodiments, however, it is not used to limit the utility model. Any skilled person in the art, without departing from the technical scheme range of the utility model, can utilize the disclosed technical content to make many possible changes and modifications to the utility model technical scheme, or modify equivalent embodiments. Therefore, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model should fall within the protection range of the utility model technical scheme.

Claims

1. A trestle bridge that can be used in tunnel waterproof construction, comprising a main bridge (1), characterized in that: The main bridge (1) is provided with longitudinal moving guide rails (11) on both sides in the transverse direction, a moving trolley (2) is arranged on the longitudinal moving guide rails (11), the moving trolley (2) is connected with a working platform (3), the working platform (3) is provided with a winding drum (31) for placing waterproof coiled material (4), a pressing mechanism (32) for pressing the waterproof coiled material (4) on the side wall of the tunnel, and a mechanical arm (33) for installing the construction tool of the waterproof coiled material (4).

2. The trestle bridge for tunnel waterproofing construction according to claim 1, wherein: The winding drum (31), the pressing mechanism (32) and the mechanical arm (33) are arranged in sequence in the longitudinal direction.

3. The trestle bridge for tunnel waterproofing construction according to claim 1, wherein: A guide roller (34) and a plurality of supporting rollers (35) are arranged between the winding drum (31) and the mechanical arm (33), the guide roller (34) and the winding drum (31) are arranged in the vertical direction, and the supporting rollers (35) are arranged horizontally, and a plurality of the supporting rollers (35) are arranged in the longitudinal direction.

4. The trestle bridge for tunnel waterproof construction according to claim 3, characterized in that: A first limiting piece (341) is arranged in parallel on one side of the guide roller (34), and a gap is formed between the first limiting piece (341) and the guide roller (34) for the waterproof coiled material (4) to pass through. And / or, the supporting rollers (35) are located on the side of the working platform (3) away from the main bridge (1), and a second limiting piece (351) is arranged on the end of the supporting roller (35) away from the working platform (3).

5. The trestle bridge for tunnel waterproofing construction according to claim 1, wherein: The pressing mechanism (32) comprises a pressing support (321) and a pressing roller (322) arranged on the pressing support (321), and the pressing support (321) is hinged to the working platform (3) to realize up-down overturning, or the pressing support (321) is in sliding connection with the working platform (3).

6. The trestle bridge for tunnel waterproofing construction according to claim 1, wherein: The winding drum (31) is hinged to the working platform (3) to realize up-down overturning.

7. The trestle for tunnel waterproof construction according to claim 1, characterized in that: The working platform (3) is provided with a lifting seat (36) and a lifting driving piece for driving the lifting seat (36) to lift, and the winding drum (31) is arranged on the lifting seat (36).

8. The trestle bridge for tunnel waterproof construction according to claim 7, characterized in that: The lifting seat (36) is provided with a guide column (361), and the working platform (3) is provided with a guide sleeve (37), and the guide column (361) is arranged in the guide sleeve (37).

9. The trestle for tunnel waterproof construction according to any one of claims 1 to 8, characterized in that: The working platform (3) is provided with a liftable auxiliary platform (38), the auxiliary platform (38) and the winding drum (31) are arranged at the longitudinal ends of the working platform (3) respectively, and the mechanical arm (33) is detachably arranged on the auxiliary platform (38).

10. The trestle for tunnel waterproof construction according to any one of claims 1 to 8, characterized in that: The mobile trolley (2) is provided with a first mounting seat (21), a second mounting seat (22) is arranged between the first mounting seat (21) and the work platform (3), a first telescopic driving element (23) and a first connecting rod assembly (24) are arranged between the first mounting seat (21) and the second mounting seat (22), one end of the first telescopic driving element (23) is hinged to the first mounting seat (21), the other end is hinged to the second mounting seat (22), the first connecting rod assembly (24) comprises two first connecting rods (241) arranged in parallel, one end of the first connecting rod (241) is hinged to the first mounting seat (21), the other end is hinged to the second mounting seat (22); The second mounting seat (22) and the work platform (3) are provided with a second telescopic driving element (25) and a second connecting rod assembly (26), one end of the second telescopic driving element (25) is hinged to the second mounting seat (22), the other end is hinged to the work platform (3), the second connecting rod assembly (26) comprises two second connecting rods (261) arranged in parallel, one end of the second connecting rod (261) is hinged to the second mounting seat (22), the other end is hinged to the work platform (3).

Images