A large-tonnage electric-hydraulic lifting platform with high security

Abstract

A large-tonnage electric hydraulic lifting platform with high safety includes a balanced lifting mechanism, a linkage extension and reinforcement support mechanism, and a double self-locking mechanism; the balanced lifting mechanism includes cross support rods, a base and a bracket, the upper end of the cross support frame is slidably connected to the bracket, and the lower end is slidably connected to the base; the linkage extension and reinforcement support mechanism includes a transmission device, an extension plate and side brackets; there are two extension plates, which are slidably installed inside the base and are driven by the transmission device to move synchronously towards or away from each other; the bottom of the side brackets is rotatably connected to both ends of the extension plates; there are two double self-locking mechanisms, which are symmetrically and slidably installed on the side brackets; in the working process of the present invention, the stress point is at the center, improving the stability of the equipment. At the same time, a double self-locking mechanism is also provided, which can lock the equipment in time in the case of cylinder explosion or failure of the hydraulic cylinder to provide power to the equipment normally, thus avoiding the occurrence of danger and improving the safety of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of lift engineering, and particularly relates to a large-tonnage electric hydraulic lifting platform with high safety. Background Art

[0002] A lift table refers to a device for vertical transportation in logistics systems such as factories and automated warehouses, and is a lifting and mechanical device for vertically transporting people or objects. Due to the free lifting characteristics of the lift table, it has currently been widely used in docks, cargo transportation in logistics centers, building decoration and other occasions. The existing lift table consists of a lifting mechanism and a power hydraulic cylinder, with relatively low safety, lacking a safety protection mechanism, and having an unstable structure during large-tonnage output, making it prone to safety accidents.

[0003] Therefore, a large-tonnage electric hydraulic lifting platform with high safety is needed to strengthen the stability of the equipment. In the case of a hydraulic cylinder bursting or malfunctioning, the equipment can be locked in time to avoid the occurrence of the risk of falling from a height. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a large-tonnage electric hydraulic lifting platform with high safety, and the technical solution used is as follows:

[0005] A large-tonnage electric hydraulic lifting platform with high safety includes a balanced lifting mechanism, a linkage extension and reinforcement support mechanism, and a double self-locking mechanism; the balanced lifting mechanism includes cross support rods, a base, and a bracket. The upper end of the cross support rod is slidably connected to the bracket, and the lower end is slidably connected to the base; the linkage extension and reinforcement support mechanism includes a transmission device, an extension plate, and side brackets;

[0006] Two bottom drive shafts are respectively rotatably installed at the bottom of both ends of the cross support rod, and the two bottom drive shafts are respectively rotatably connected to the input racks provided in the transmission device; the two extension plates are slidably installed inside the base and are driven by the transmission device to move synchronously towards or away from each other; there are two side brackets, and the bottom of each side bracket is rotatably connected to both ends of the extension plate; a locking rack is provided on the outside of each side bracket;

[0007] There are two double self-locking mechanisms, which are symmetrically and slidably installed on the side brackets and are rotatably connected to the bracket.

[0008] Furthermore, the double self-locking mechanism includes a locking tooth, a sliding frame, a pawl, an electric cylinder, a torsion spring, a centrifugal wheel, a centrifugal rod, and a tension spring; the sliding frame is slidably installed on the side bracket, and both sliding frames are rotatably connected to one end of the bracket through rotating shafts provided on both sides; the locking gear is rotatably connected inside the sliding frame and meshed with the locking rack of the side bracket; the pawl is rotatably installed in the sliding frame through a connecting rod, and is located on one side of the locking gear, and is meshed with the locking gear under the reset action of the torsion spring to keep the locking gear rotating in one direction; the electric cylinder is fixedly installed on the sliding frame and is used to separate the pawl from the locking gear after the output end extends; the torsion spring is rotatably installed on the pawl, and both ends are installed on both sides of the sliding frame; the centrifugal wheel is coaxially and fixedly connected to the locking gear and is located outside the sliding frame; a convex block is provided on the outside of the centrifugal wheel, and a centrifugal rod is installed beside the convex block; one end of the centrifugal rod is rotatably connected to the eccentric position of the centrifugal wheel, and the other end or the middle of the centrifugal rod is connected to the tension spring, and the other end of the tension spring is fixed on the centrifugal wheel; when the mechanism slides up and down normally, the tension spring is in a normal reset state, the whole centrifugal rod is located within the circular contour of the centrifugal wheel, when the tension spring is stretched, the centrifugal rod is thrown out of the centrifugal wheel contour under the action of inertia and centrifugal force and is blocked by the convex block of the centrifugal wheel, and the extended centrifugal rod can block the bracket.

[0009] Furthermore, the transmission device includes a carriage, an input spur gear, an input large bevel gear, an output small bevel gear, a worm, a worm gear, and a driving gear; the carriage is fixedly connected to the balance lifting mechanism; there are two input racks, which are symmetrically slidably installed on both sides of the carriage, and the two input racks are respectively rotatably connected to the two bottom drive shafts of the cross support rod, and move towards or away from each other; the input spur gear is rotatably installed at the center position of the carriage and meshed with the two input racks; the input large bevel gear is coaxially and fixedly connected to the input spur gear; there are two output small bevel gears, which are symmetrically distributed on both sides of the input large bevel gear and meshed with the input large bevel gear; each output small bevel gear is coaxially and fixedly connected to a worm respectively, and each worm is meshed with two worm gears respectively, and the two worm gears are symmetrically distributed before and after both sides of the worm and rotate in opposite directions; each worm gear is coaxially and fixedly connected to the driving gear, and the worm gear and the driving gear are integrally rotatably connected to the base; gear teeth are distributed on the inner sides of the two extension plates and are respectively meshed with the two driving gears on the same side.

[0010] Furthermore, the balance lifting mechanism further includes a hydraulic cylinder, a support plate, and a main bracket; one end of the hydraulic cylinder is rotatably connected to the upper end of one side of the main bracket, and the other end is rotatably connected to the cross rotating shaft of the cross support rod; the cross support rod is slidably connected to the main bracket; the support plate is installed on the bracket; the main bracket is fixedly connected to the base.

[0011] Furthermore, both ends of the carriage are fixedly connected inside the main bracket.

[0012] Furthermore, tires are provided at the four corners of the bottom of the base.

[0013] Furthermore, tires are provided at both ends of the bottom of the extension plate.

[0014] Since the present invention adopts the above technical solutions, the present invention has the following advantages:

[0015] 1. Through the cooperative design of the balanced lifting mechanism, the linkage extension and reinforcement support mechanism, and the double self-locking mechanism, the safety of the lifting platform is improved in the present invention: both ends of the cross support rod are installed in a sliding manner. During the process of lifting the bracket by the cross support rod driven by the hydraulic cylinder, the two support rods at both ends move towards the center, so that the stress point is at the center, making the equipment more stable; the extendable side brackets arranged on both sides of the device can form a trapezoid, thus greatly enhancing the stability of the equipment.

[0016] 2. The present invention is provided with a double self-locking mechanism. Whether in the ascending process or the descending process, in the case that the hydraulic cylinder explodes or fails and cannot provide power to the equipment normally, it can lock the equipment in time, thereby avoiding the occurrence of danger and improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 is a schematic diagram of the structure of the balanced lifting mechanism of the present invention.

[0019] Figure 3 is a schematic diagram of the structure of the linkage extension and reinforcement support mechanism of the present invention.

[0020] Figure 4 is a schematic diagram of the structure of the sliding device of the present invention.

[0021] Figure 5 is a schematic diagram of the structure of the double self-locking structure and the side bracket of the present invention.

[0022] Figure 6 is a schematic diagram of the side structure of the double self-locking structure and the side bracket of the present invention.

[0023] Figure 7 is a schematic diagram of the bottom structure of the present invention.

[0024] Reference Numerals in the Drawings:

[0025] 1 - Balanced lifting mechanism;

[0026] 101 - Hydraulic cylinder; 102 - Cross support rod; 103 - Support plate; 104 - Main bracket; 105 - Base; 106 - Bracket;

[0027] 2-linkage extended reinforcement support mechanism;

[0028] 201 - Transmission device (2011 - carriage; 2012 - input rack; 2013 - input spur gear; 2014 - input large bevel gear; 2015 - output small bevel gear; 2016 - worm; 2017 - worm gear; 2018 - drive gear); 202 - extension plate; 203 - side bracket;

[0029] 3 - Double self - locking mechanism;

[0030] 301 - locking gear; 302 - sliding frame; 303 - pawl; 304 - electric cylinder; 305 - torsion spring; 306 - centrifugal wheel; 307 - centrifugal rod; 308 - tension spring. Detailed implementation manners

[0031] The technical solution of the present invention will be further specifically described below through embodiments in combination with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "in", "out", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] Embodiment:

[0034] This embodiment provides a technical solution, as Figures 1-7 shown, a large - tonnage electric - hydraulic lifting platform with high safety, which can make the equipment stop suddenly when the hydraulic cylinder suddenly loses power, including a balance lifting mechanism 1, a 2 - linkage extended reinforcement support mechanism 2 and a 3 - double self - locking mechanism 3; the balance lifting mechanism 1 further includes a hydraulic cylinder 101, a cross - support rod 102, a pallet 103, a main bracket 104, a base 105 and a bracket 106; the 2 - linkage extended reinforcement support mechanism 2 includes a transmission device 201, an extension plate 202 and a side bracket 203; the 3 - double self - locking mechanism 3 includes a locking tooth 301, a slider 302, a pawl 303, an electric cylinder 304, a torsion spring 305, a centrifugal wheel 306, a centrifugal rod 307 and a tension spring 308;

[0035] As a specific implementation manner of this embodiment, asFigure 2 As shown, one end of the hydraulic cylinder 101 is rotatably connected to the upper end of one side of the main bracket 104, and the other end is rotatably connected to the cross rotation shaft of the cross support rod 102; two bottom transmission shafts are respectively installed at the bottom of the branches of the cross support rod 102, and wheels are provided on both sides of the bottom transmission shafts, which are rotatably connected to the main bracket 104; two upper transmission shafts are respectively rotatably installed on the upper parts of the branches of the cross support rod 102, and wheels are provided on both sides of the upper transmission shafts, which are rotatably connected to the bracket 106; the tray 103 is installed on the bracket 106; the main bracket 104 is fixedly connected to the base 105.

[0036] As a specific implementation manner of this embodiment, as Figures 1-4 shown, two bottom transmission shafts are respectively rotatably installed at the bottoms of both ends of the cross support rod 102, and the two bottom transmission shafts are respectively rotatably connected to the input racks 2012 provided in the transmission device 201; the two extension plates 202 are slidably installed inside the base 105 and are driven by the transmission device 201 to move synchronously in opposite or the same directions; there are two side brackets 203, and the bottom of each side bracket 203 is rotatably connected to both ends of the extension plate; a locking rack is provided on the outside of each side bracket 203;

[0037] Among them, the transmission device 201 includes a carriage 2011, an input rack 2012, an input spur gear 2013, an input large bevel gear 2014, an output small bevel gear 2015, a worm 2016, a worm gear 2017 and a driving gear 2018; both ends of the carriage 2011 are fixedly connected to the inside of the main bracket 104; there are two input racks 2012, which are symmetrically slidably installed on both sides of the chute 2011, and the two input racks 2012 are respectively rotatably connected to the two bottom transmission shafts of the cross support rod 102 and move in opposite or the same directions; the input spur gear 2013 is rotatably installed at the center of the carriage 2011 and meshes with the two input racks 2012; the input large bevel gear 2014 is coaxially fixedly connected to the input spur gear 2013; there are two output small bevel gears 2015, which are symmetrically distributed on both sides of the input large bevel gear 2014 and mesh with the input large bevel gear 2014; each output small bevel gear 2015 is coaxially fixedly connected to a worm 2016, and each worm 2016 meshes with two worm gears 2017, and the two worm gears 2017 are symmetrically distributed in front of and behind the worm 2016 and rotate in opposite directions; each worm gear 2017 is coaxially fixedly connected to the driving gear 2018, and the worm gear 2017 and the driving gear 2018 are integrally rotatably connected to the base 105; gear teeth are distributed on the inner sides of the two extension plates 202 and are respectively meshed and connected to the two driving gears 2018 on the same side.

[0038] As a specific implementation manner of this embodiment, as Figures 5-6As shown, there are two double self-locking mechanisms 3, which are symmetrically slidably mounted on the side bracket 203; the sliding frame 302 is slidably mounted on the side bracket 203, and the two sliding frames 302 are rotatably connected to one end of the bracket 106 through the rotating shafts arranged on both sides; the locking gear 301 is rotatably connected to the inside of the sliding frame 302, and is meshed with the locking rack of the side bracket 203; the ratchet 303 is rotatably mounted in the sliding frame 302 through a connecting rod and is located on one side of the locking gear 301, and is meshed with the locking gear 301 under the reset action of the torsion spring 305, so as to maintain the unidirectional rotation of the locking gear 301; the electric cylinder 304 is fixedly mounted on the slider 302, and is used to separate the ratchet 303 from the locking gear 301 after the output end is extended; the torsion spring 305 is rotatably mounted on the ratchet 303, and both ends are fixed The centrifugal wheel 306 is fixed on both sides of the slider 302; the centrifugal wheel 306 is coaxially fixedly connected with the locking gear 301 and is located outside the slide frame 302; a protrusion is provided at the outer edge of the centrifugal wheel 306, and a centrifugal rod 307 is installed next to the protrusion; one end of the centrifugal rod 307 is rotatably connected to the eccentric part of the centrifugal wheel 306, and the other end of the centrifugal rod 307 is connected to the tension spring 308, and the other end of the tension spring 308 is fixed on the centrifugal wheel 306; when the mechanism slides up and down normally, the tension spring 308 is in a normal reset state, and the centrifugal rod 307 is located as a whole within the circular contour of the centrifugal wheel 306. When the tension spring 308 is stretched, the centrifugal rod 307 is thrown out of the contour of the centrifugal wheel 306 under the action of inertia and centrifugal force and is resisted by the protrusion of the centrifugal wheel 306, and the extended centrifugal rod 307 can clamp the bracket 106.

[0039] As a specific implementation of this embodiment, Figure 1 As shown, in order to facilitate the movement of the electric hydraulic lifting platform, tires are provided at the four corners of the bottom of the base 105.

[0040] As a specific implementation of this embodiment, Figure 2 As shown, in order to keep the extension plate 202 extended and supported stably, tires are provided at both ends of the bottom of the extension plate 202 .

[0041] Working principle:

[0042] After the hydraulic cylinder 101 is started, the cross support rod 102 is lifted, the upper bracket 106 of the cross support rod 102 rises, and the bottom drive shaft moves towards each other under the drive of the cross support rod 102, thereby driving the two input racks 2012 to slide towards each other on the carriage 2011; the two input racks 2012 drive the input spur gear 2013 to rotate, and the input spur gear 2013 drives the input large bevel gear 2014 connected coaxially with it to rotate; the input large bevel gear 2014 drives the two output small bevel gears 2015 to rotate in opposite directions, and drives the worm 2016 connected to each of them to rotate; each worm 2016 drives the worm wheels 2017 on both sides of it to rotate in opposite directions, and each worm wheel 2017 drives the drive gear 2018 connected coaxially with it to rotate, and the two drive gears 2018 rotating in opposite directions drive the extension plate 202 on this side to move outwards and extend, and the extension plate 202 on the other side extends outwards in the same way, so the extension plates 202 on both sides extend outwards at the same time;

[0043] Similarly, when the cross support rod 102 descends, the bottom drive shaft moves in the reverse direction, the two input racks 2012 slide in the reverse direction on the carriage 2011, the input racks 2012 drive the input spur gear 2013 to rotate, and through a series of rotations of gears, worms and worm wheels, the extension plates 202 on both sides move inwards at the same time and finally return to their original positions;

[0044] When the hydraulic cylinder 101 drives the cross support rod 102 to rise, the cross support rod 102 moves the bracket 106 upwards, and the bracket 106 drives the sliding frame 302 connected to it to slide upwards along the side support 203. Similarly, when the hydraulic cylinder 101 drives the sliding frame 302 to descend;

[0045] On the one hand, the working principle of the first self-locking mechanism of the equipment is as follows:

[0046] When the hydraulic cylinder 101 operates normally to make the sliding frame 302 slide upwards, the protruding part of the pawl 303 will not block the rotation of the locking gear 301. At this time, the locking gear 301 moves upwards along the locking rack of the side support 203 during the upward movement of the sliding frame 302; during the process of the hydraulic cylinder 101 operating normally to make the sliding frame 302 move downwards, since the pawl 303 makes the locking gear 301 rotate in one direction only, the locking gear 301 cannot rotate at this time, so the electric cylinder 304 needs to press down the tail end of the pawl 303 to make the protruding part of the pawl 303 lift upwards, so that the locking gear 301 can rotate and the sliding frame 302 can move downwards smoothly; after the electric cylinder 304 is released, the pawl 303 returns to its original position under the reset action of the torsion spring 305 and continues to make the locking gear 301 rotate in one direction only;

[0047] During the process of the cross support rod 102 driving the bracket 106 to rise, the pawl 303 causes the locking gear 301 to rotate unidirectionally; if the hydraulic cylinder 101 suddenly fails, the equipment loses the power to rise and begins to descend. At this time, the locking gear 301 will rotate in the reverse direction. At this moment, the pawl 303 will lock the locking gear 301 to prevent it from rotating, thereby stopping the equipment from descending;

[0048] When the cross support rod 102 is fixed and the bracket 106 stops at a certain height, the protruding part of the pawl 303 is still in the tooth gap of the locking gear 301; if the hydraulic cylinder 101 suddenly fails, the equipment loses the supporting force and begins to descend. At this time, the locking gear 301 will rotate in the reverse direction. At this moment, the pawl 303 will lock the locking gear 301 to prevent it from rotating, thereby stopping the trend of the equipment from descending;

[0049] On the other hand, in the following situations, the second self-locking mechanism of the equipment will be activated:

[0050] 1. During the process of the cross support rod 102 driving the bracket 106 to rise, the hydraulic cylinder 101 suddenly fails and cannot provide power for the equipment, and the first self-locking mechanism fails due to damage or other reasons;

[0051] 2. When the cross support rod 102 is fixed, the bracket 106 stops at a certain height, the hydraulic cylinder 101 suddenly fails and cannot provide supporting force for the equipment, and the first self-locking mechanism fails due to damage or other reasons;

[0052] 3. During the process of the cross support rod 102 driving the bracket 106 to descend, the hydraulic cylinder 101 suddenly fails and cannot provide power for the equipment;

[0053] Working principle of the second self-locking mechanism:

[0054] When the hydraulic cylinder 101 and the electric cylinder 304 are operating normally and the locking gear 301 moves up and down normally, the centrifugal wheel 306 rotates normally with the locking gear 301. Since the rotational speed of the centrifugal wheel 306 is slow, the whole centrifugal rod 307 is in the normal position within the circular contour of the centrifugal wheel 306 and rotates relative to the center of the centrifugal wheel 306, and the tension spring 308 is in the normal reset state; when the hydraulic cylinder 101 suddenly fails and the equipment suddenly has a downward trend, the rotational speed of the locking gear 301 will instantaneously increase, driving the rotational speed of the centrifugal wheel 306 coaxial with it to also instantaneously increase. At this time, due to inertia and centrifugal force, the centrifugal rod 307 will be thrown away from its original normal position, a part of the centrifugal rod 307 will extend out of the contour of the centrifugal wheel 306, and the tension spring 308 will be pulled open. The centrifugal wheel 306 continues to rotate, and the convex block on the centrifugal wheel 306 abuts against the centrifugal rod 307 and then drives the centrifugal rod 307 to rotate. The part of the centrifugal rod 307 extending out of the contour of the centrifugal wheel 306 can catch the frame of the bracket 106, causing the centrifugal wheel 306 to stop rotating, thereby causing the locking gear 301 to also stop rotating and the sliding frame 302 to stop sliding, making the equipment stop suddenly;

[0055] The above two self-locking mechanisms together constitute the double self-locking mechanism of this equipment.

Claims

1. A large-tonnage electric-hydraulic lifting platform with high safety, characterized in that, It includes a balanced lifting mechanism (1), a linkage extension and reinforcement support mechanism (2), and a double self-locking mechanism (3); the balanced lifting mechanism (1) includes a cross support rod (102), a base (105), and a bracket (106). The upper end of the cross support rod (102) is slidably connected to the bracket (106), and the lower end is slidably connected to the base (105); the linkage extension and reinforcement support mechanism (2) includes a transmission device (201), an extension plate (202), and a side support (203); At both bottom ends of the cross support rod (102), two bottom end transmission shafts are respectively rotatably installed, and the two bottom end transmission shafts are respectively rotatably connected to an input rack (2012) provided in the transmission device (201); the two extension plates (202) are slidably installed inside the base (105) and are driven by the transmission device (201) to move synchronously towards or away from each other; there are two side supports (203), and the bottom of each side support (203) is rotatably connected to both ends of the extension plate (202); a locking rack is provided on the outside of each side support (203); There are two double self-locking mechanisms (3), which are symmetrically and slidably installed on the side supports (203) and are rotatably connected to the bracket (106); The double self-locking mechanism (3) comprises a locking gear (301), a sliding frame (302), a ratchet (303), an electric cylinder (304), a torsion spring (305), a centrifugal wheel (306), a centrifugal rod (307) and a tension spring (308); the sliding frame (302) is slidably mounted on the side bracket (203), and the two sliding frames (302) are rotatably connected to one end of the bracket (106) via rotating shafts arranged on both sides; the locking gear (301) is rotatably connected to the sliding frame (302) The pawl (303) is rotatably mounted in the sliding frame (302) through a connecting rod and is located on one side of the locking gear (301). The pawl (303) is meshed with the locking gear (301) under the reset action of the torsion spring (305) to keep the locking gear (301) rotating in one direction. The electric cylinder (304) is fixedly mounted on the sliding frame (302) and is used to separate the pawl (303) from the locking gear (301) after the output end is extended. The rotation spring (305) is rotatably mounted on the pawl (303), and its two ends are mounted on both sides of the slide frame (302); the centrifugal wheel (306) is coaxially fixedly connected to the locking gear (301) and is located outside the slide frame (302); a protrusion is provided on the outside of the centrifugal wheel (306), and a centrifugal rod (307) is installed next to the protrusion; one end of the centrifugal rod (307) is rotatably connected to the eccentric position of the centrifugal wheel (306), and the other end or the middle part of the centrifugal rod (307) is connected to the tension spring (308). , the other end of the stretch spring (308) is fixed on the centrifugal wheel (306); when the mechanism slides up and down normally, the stretch spring (308) is in a normal reset state, and the centrifugal rod (307) is located in the circular contour of the centrifugal wheel (306) as a whole. When the stretch spring (308) is stretched, the centrifugal rod (307) is thrown out of the contour of the centrifugal wheel (306) under the action of inertia and centrifugal force and is resisted by the protrusion of the centrifugal wheel (306), and the extended centrifugal rod (307) can clamp the bracket (106).

2. The high-safety large-tonnage electric hydraulic lifting platform according to claim 1, characterized in that, The transmission device (201) further includes a carriage (2011), an input spur gear (2013), an input bevel gear (2014), an output bevel gear (2015), a worm (2016), a worm gear (2017) and a driving gear (2018); the carriage (2011) is fixedly connected to the balance lifting mechanism (1); there are two input racks (2012), which are symmetrically slidably mounted on both sides of the carriage (2011), and the two input racks (2012) are respectively rotatably connected to the two bottom drive shafts of the cross support rod (102), and move towards or away from each other; the input spur gear (2013) is rotatably mounted at the central position of the carriage (2011) and meshes with the two input racks (2012); the input bevel gear (2014) is coaxially and fixedly connected to the input spur gear (2013); there are two output bevel gears (2015), which are symmetrically distributed on both sides of the input bevel gear (2014) and mesh with the input bevel gear (2014); each output bevel gear (2015) is coaxially and fixedly connected to a worm (2016), and each worm (2016) meshes with two worm gears (2017), and the two worm gears (2017) are symmetrically distributed on both sides of the worm (2016) and rotate in opposite directions; each worm gear (2017) is coaxially and fixedly connected to a driving gear (2018), and the worm gear (2017) and the driving gear (2018) are integrally rotatably connected to the base (105); the inner sides of the two extension plates (202) are both provided with teeth and are respectively meshingly connected to the two driving gears (2018) on the same side.

3. A large-tonnage electric-hydraulic lifting platform with high safety according to claim 1, characterized in that, The balance lifting mechanism (1) further includes a hydraulic cylinder (101), a support plate (103) and a main bracket (104); one end of the hydraulic cylinder (101) is rotatably connected to the upper end of one side of the main bracket (104), and the other end is rotatably connected to the cross rotation shaft of the cross support rod (102); the cross support rod (102) is slidably connected to the main bracket (104); the support plate (103) is mounted on the bracket (106); the main bracket (104) is fixedly connected to the base (105).

4. The high-safety large-tonnage electric-hydraulic lifting platform according to claim 2, wherein Both ends of the carriage (2011) are fixedly connected inside the main bracket (104).

5. A large-tonnage electric-hydraulic lifting platform with high safety according to any one of claims 1-4, characterized in that Tires are provided at the four corners of the bottom of the base (105).

6. The high-safety large-tonnage electric hydraulic lifting platform according to claim 5, characterized in that Tires are provided at both ends of the bottom of the extension plate (202).

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