Double-lifting two-cylinder two-stage full-free gantry

Abstract

The invention relates to the technical field of forklift door frames, in particular to a double-lifting two-cylinder two-stage full-free door frame which comprises a supporting frame, a pallet fork mechanism and a lifting mechanism. The lifting mechanism comprises a connecting plate fixedly arranged on the inner wall of the inner portal, a mounting block is fixedly arranged on the surface of the connecting plate, a first hydraulic cylinder is fixedly arranged on the upper surface of the mounting block, a first transmission pulley is arranged at the top of the telescopic end of the first hydraulic cylinder, and a first transmission chain is slidably arranged on the surface of the first transmission pulley. The lifting mechanism further comprises a second hydraulic cylinder fixedly arranged on the upper surface of the bottom supporting plate. By arranging the supporting frame, the pallet fork mechanism and the lifting mechanism, in the actual use process of the portal frame, an electric oil cylinder can be started to convey hydraulic oil into a first hydraulic cylinder, the first hydraulic cylinder is driven to extend, after the first hydraulic cylinder extends to the maximum, the electric oil cylinder enables a second hydraulic cylinder to extend, and the double-lifting purpose is achieved; and therefore, the operation on higher goods is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forklift mast, in particular to a double-lifting two-cylinder two-stage full-free mast. BACKGROUND

[0002] The existing forklift full-free mast is usually composed of inner and outer masts, fork frames and the like, and has three lifting oil cylinders, one of which is a full-free lifting oil cylinder and the other two are left and right lifting oil cylinders. However, the lifting height of the existing forklift full-free mast cannot meet the operation requirements of higher height in actual use.

[0003] In view of this, the present application provides a double-lifting two-cylinder two-stage full-free mast. SUMMARY

[0004] The purpose of the present application is to solve at least one technical problem raised in the background art.

[0005] The present application provides a double-lifting two-cylinder two-stage full-free mast, which comprises a support frame, a fork mechanism and a lifting mechanism. The support frame comprises a bottom support plate and an outer mast fixed on the upper surface of the bottom support plate, and the inner wall of the outer mast is slidably provided with an inner mast. The fork mechanism comprises two lifting plates slidably provided on the inner wall of the inner mast, and the end portions of the two lifting plates are fixedly provided with limiting baffle plates, and the surfaces of the limiting baffle plates are fixedly provided with two symmetrical fork bodies. The lifting mechanism comprises a connecting plate fixedly provided on the inner wall of the inner mast, a mounting block fixedly provided on the surface of the connecting plate, a first hydraulic cylinder fixedly provided on the upper surface of the mounting block, a first transmission pulley provided on the top of the telescopic end of the first hydraulic cylinder, a first transmission chain slidably provided on the surface of the first transmission pulley, a second hydraulic cylinder fixedly provided on the upper surface of the bottom support plate, and a second transmission pulley provided on the top of the telescopic end of the second hydraulic cylinder, a second transmission chain slidably provided on the surface of the second transmission pulley, and a fixed plate fixedly provided on the surface of the outer mast, and the surface of the fixed plate is provided with an electric oil cylinder for oiling the interiors of the first and second hydraulic cylinders.

[0006] Preferably, one end of the first transmission chain is fixedly connected with the surface of the first hydraulic cylinder through a first connecting block, and the other end of the first transmission chain is fixedly connected with the surface of the limiting baffle plate through a second connecting block.

[0007] By adopting the above technical scheme, when the first hydraulic cylinder is elongated, the limiting baffle plate and the fork body can be automatically lifted by the first transmission chain.

[0008] Preferably, one end of the second transmission chain is fixedly connected to the surface of the second hydraulic cylinder via a third connecting block, and the other end of the second transmission chain is fixedly connected to the upper surface of the connecting plate via a fourth connecting block.

[0009] By adopting the above technical solution, when the second hydraulic cylinder extends, the connecting plate and the first hydraulic cylinder can be automatically lifted by the second transmission chain.

[0010] Preferably, a limiting mechanism is provided between the two fork bodies, the limiting mechanism being used to limit the goods on the fork bodies when the goods are transferred through the fork bodies.

[0011] By adopting the above technical solution, the goods can be prevented from slipping off the front end of the fork body during transfer by the action of the limiting mechanism.

[0012] Preferably, the limiting mechanism includes a rectangular plate fixed to the surface of the limiting baffle and located between the two fork bodies. The rectangular plate has a rectangular opening at its end, and a rotating shaft is rotatably provided on the inner wall of the rectangular opening. A limiting frame is fixed on the surface of the rotating shaft.

[0013] By adopting the above technical solution, the limiting frame can limit the front end of the fork body under the action of the limiting frame.

[0014] Preferably, the limiting baffle has a first rectangular cavity inside, a first connecting shaft is rotatably provided on the inner wall of the first rectangular cavity, a gear plate is fixed on the surface of the first connecting shaft, a straight rack is fixed on one side surface of the inner gantry, the straight rack meshes with the gear plate, and a spring spring is provided at the end of the first connecting shaft for resetting the first connecting shaft.

[0015] By adopting the above technical solution, when the goods are lifted to a lower height for transfer, during the lifting process of the limit baffle and the fork body, the toothed disc is driven to rotate under the action of the rack to transfer the goods to the designated position. When the goods are lifted to a higher position, the toothed disc disengages from the rack, and the first connecting shaft can be reset under the action of the spring, thereby driving the limit frame to reset.

[0016] Preferably, the inner wall of the first rectangular cavity has a strip-shaped opening that penetrates the limiting baffle, and the strip-shaped opening corresponds to the gear disk.

[0017] By adopting the above technical solution, it is easy for the gear plate to rotate under the action of the straight rack.

[0018] Preferably, the rectangular plate has a second rectangular cavity inside, a connecting box is fixed to the inner wall of the rectangular cavity, and rotating holes penetrating the connecting box are opened on both sides of the connecting box. The inner wall of the rotating hole is rotatably connected to the surface of the rotating shaft.

[0019] By adopting the above technical solution, the limiting frame can be made to rotate with the rotating shaft under the action of the rotating shaft.

[0020] Preferably, the inner wall of the connecting box is rotatably provided with a second connecting shaft, and one end of the second connecting shaft and the surface of the rotating shaft are both fixedly provided with a first bevel gear that meshes with each other.

[0021] By adopting the above technical solution, the rotating shaft can be automatically rotated under the action of the two first bevel gears during the rotation of the second connecting shaft.

[0022] Preferably, the other end of the second connecting shaft extends into the interior of the second rectangular cavity and is rotatably connected to the inner wall of the second rectangular cavity. The inner walls of the second rectangular cavity and the connecting box are both provided with through holes that are rotatably connected to the surface of the second connecting shaft. The inner top wall of the second rectangular cavity is rotatably provided with a third connecting shaft extending into the interior of the first rectangular cavity. The bottom end of the third connecting shaft and the surface of the second connecting shaft are both fixed with a second bevel gear that meshes with each other. The top end of the third connecting shaft and the surface of the first connecting shaft are both fixed with a third bevel gear that meshes with each other.

[0023] By adopting the above technical solution, when the first connecting shaft rotates, the second connecting shaft can be driven to rotate under the action of the two third bevel gears. At the same time, during the rotation of the third connecting shaft, the second connecting shaft can be driven to rotate automatically under the action of the two second bevel gears.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The dual-lift, two-cylinder, two-stage fully free mast described in this application, by setting up a support frame, fork mechanism, and lifting mechanism, enables the mast to, during actual use, when it is necessary to lift goods to a higher position, activate the electric hydraulic cylinder to deliver hydraulic oil to the first hydraulic cylinder, driving the first hydraulic cylinder to extend. The extension of the first hydraulic cylinder drives the limit baffle to move upward through the first transmission chain, thereby driving the lifting plate to move upward on the inner wall of the two inner masts, and simultaneously driving the fork body to move upward to lift the goods. When the first hydraulic cylinder extends to its maximum, the electric hydraulic cylinder injects oil into the second hydraulic cylinder, causing the second hydraulic cylinder to extend. The extension of the second hydraulic cylinder drives the connecting plate to move upward through the second transmission chain. The upward movement of the connecting plate drives the first hydraulic cylinder and the fork body to move upward, and drives the inner mast to move upward inside the outer mast, thereby achieving the purpose of dual lifting, and thus enabling the operation of higher goods.

[0025] 2. The dual-lift, two-cylinder, two-stage fully free mast described in this application, by setting a limiting mechanism, enables the mast to transfer goods. When the fork body lifts the goods to a lower height for transfer, the upward movement of the limiting baffle can drive the gear disc to rotate under the action of the rack. The rotation of the gear disc drives the first connecting shaft to rotate. The rotation of the first connecting shaft drives the third connecting shaft to rotate under the action of two third bevel gears. The rotation of the third connecting shaft drives the second connecting shaft to rotate under the action of two second bevel gears. The rotation of the second connecting shaft drives the rotating shaft to rotate under the action of two first bevel gears. The rotation of the shaft drives the limit frame to rotate 90 degrees, limiting the front end of the goods on the fork body to prevent the goods from slipping off the front end of the fork body during transfer, thus achieving the purpose of effectively protecting the goods during transfer. Moreover, when the goods are lifted to a lower height for transfer, during the lifting process of the limit baffle and the fork body, the toothed disc is driven to rotate under the action of the rack, transferring the goods to the designated position. When the goods are lifted to a higher position, the toothed disc disengages from the rack, and the first connecting shaft can be reset under the action of the spring, thereby driving the limit frame to reset. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a rear view structural diagram of Embodiment 1 of this application; Figure 3 This is a side view of the structure of Embodiment 1 of this application; Figure 4 This is a schematic diagram of the structure above the bottom support plate in Embodiment 1 of this application from a first-view perspective; Figure 5 This is a schematic diagram of the structure above the bottom support plate in Embodiment 1 of this application from a second perspective; Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this application; Figure 7 This is a three-dimensional structural diagram of the limiting mechanism in Embodiment 2 of this application; Figure 8 This is a schematic diagram of the limiting mechanism from a second perspective in Embodiment 2 of this application; Figure 9 This is a schematic cross-sectional view of the limiting mechanism in Embodiment 2 of this application; Figure 10 This application Figure 9 Enlarged structural diagram at point A in the middle; Figure 11 This application Figure 9 Enlarged structural diagram at point B.

[0027] Explanation of reference numerals in the attached figures: 100. Support frame; 101. Bottom support plate; 102. Outer gantry; 103. Inner gantry; 200. Fork mechanism; 201. Lifting plate; 202. Limiting baffle; 203. Fork body; 300. Lifting mechanism; 301. Connecting plate; 302. Mounting block; 303. First hydraulic cylinder; 304. First transmission pulley; 305. First transmission chain; 306. Second hydraulic cylinder; 307. Second transmission pulley; 308. Second transmission chain; 309. Electric hydraulic cylinder; 400. Limiting mechanism; 401. Rectangular plate; 402. Rotating shaft; 403. Limiting frame; 404. First connecting shaft; 405. Gear plate; 406. Connecting box; 407. Second connecting shaft; 408. First bevel gear; 409. Third connecting shaft; 4010. Second bevel gear; 4011. Straight rack; 4012. Third bevel gear. Detailed Implementation

[0028] The following combination Figures 1 to 11 This application will be described in further detail below.

[0029] Example 1 Please refer to the following carefully. Figures 1 to 5 The dual-lift, two-cylinder, two-stage fully free mast includes a support frame 100, a fork mechanism 200, and a lifting mechanism 300. The support frame 100 includes a bottom support plate 101 and an outer mast 102 fixed to the upper surface of the bottom support plate 101. An inner mast 103 is slidably mounted on the inner wall of the outer mast 102. The fork mechanism 200 includes two lifting plates 201 slidably mounted on the inner wall of the inner mast 103, with limiting baffles 202 fixed to the ends of the two lifting plates 201. Two symmetrical fork bodies 203 are fixed to the surface of the limiting baffles 202. The lifting mechanism 300 includes a connecting plate 301 fixed to the inner wall of the inner mast 103, with mounting blocks 302 fixed to the surface of the connecting plate 301. The upper surface of the mounting block 302 is fixedly provided with a first hydraulic cylinder 303. The top of the telescopic end of the first hydraulic cylinder 303 is provided with a first transmission pulley 304. The surface of the first transmission pulley 304 is slidably provided with a first transmission chain 305. The lifting mechanism 300 also includes a second hydraulic cylinder 306 fixedly provided on the upper surface of the bottom support plate 101, and a second transmission pulley 307 provided on the top of the telescopic end of the second hydraulic cylinder 306. The surface of the second transmission pulley 307 is slidably provided with a second transmission chain 308. The surface of the outer gantry 102 is fixedly provided with a fixing plate, and the surface of the fixing plate is provided with an electric hydraulic cylinder 309 for injecting oil into the interior of the first hydraulic cylinder 303 and the second hydraulic cylinder 306.

[0030] Please refer to this carefully. Figure 2 , Figure 4One end of the first transmission chain 305 is fixedly connected to the surface of the first hydraulic cylinder 303 through the first connecting block, and the other end of the first transmission chain 305 is fixedly connected to the surface of the limiting baffle 202 through the second connecting block.

[0031] Specifically, when the first hydraulic cylinder 303 extends, the first transmission chain 305 drives the limit baffle 202 and the fork body 203 to automatically lift.

[0032] Please refer to this carefully. Figure 3 , Figure 5 One end of the second transmission chain 308 is fixedly connected to the surface of the second hydraulic cylinder 306 through the third connecting block, and the other end of the second transmission chain 308 is fixedly connected to the upper surface of the connecting plate 301 through the fourth connecting block.

[0033] Specifically, when the second hydraulic cylinder 306 extends, the connecting plate 301 and the first hydraulic cylinder 303 can be automatically lifted via the second transmission chain 308.

[0034] In this embodiment, by setting up a support frame 100, a fork mechanism 200, and a lifting mechanism 300, the mast can, during actual use, when it is necessary to lift goods to a higher position, activate the electric hydraulic cylinder 309 to deliver hydraulic oil to the first hydraulic cylinder 303, driving the first hydraulic cylinder 303 to extend. The extension of the first hydraulic cylinder 303 drives the limiting baffle 202 to move upward through the first transmission chain 305, thereby driving the lifting plate 201 to move upward on the inner walls of the two inner masts 103, and simultaneously driving the fork body 203 to move upward. The upward movement lifts the goods. When the first hydraulic cylinder 303 extends to its maximum, the electric hydraulic cylinder 309 injects oil into the second hydraulic cylinder 306, causing the second hydraulic cylinder 306 to extend. The extension of the second hydraulic cylinder 306 drives the connecting plate 301 to move upward through the second transmission chain 308. The upward movement of the connecting plate 301 drives the first hydraulic cylinder 303 and the fork body 203 to move upward, and drives the inner mast 103 to move upward inside the outer mast 102, thereby achieving the purpose of double lifting and thus enabling the operation of higher goods.

[0035] Example 2 Based on Example 1, referring to Figures 6 to 11 And unlike Example 1, the following is true: Please refer to this carefully. Figure 6 , Figure 7 A limiting mechanism 400 is provided between the two fork bodies 203. The limiting mechanism 400 is used to limit the goods on the fork bodies 203 when the goods are transferred through the fork bodies 203.

[0036] Specifically, the limiting mechanism 400 can prevent goods from slipping off the front end of the fork body 203 during transfer.

[0037] Please refer to this carefully. Figure 6 , Figure 7 The limiting mechanism 400 includes a rectangular plate 401 fixed on the surface of the limiting baffle 202 and located between the two fork bodies 203. The rectangular plate 401 has a rectangular opening at its end. A rotating shaft 402 is rotatably mounted on the inner wall of the rectangular opening, and a limiting frame 403 is fixed on the surface of the rotating shaft 402.

[0038] Specifically, under the action of the limit frame 403, the limit frame 403 can limit the front end of the fork body 203.

[0039] Please refer to this carefully. Figure 8 , Figure 9 The limiting baffle 202 has a first rectangular cavity inside. The inner wall of the first rectangular cavity is rotatably provided with a first connecting shaft 404. A gear plate 405 is fixed on the surface of the first connecting shaft 404. A straight rack 4011 is fixed on one side surface of the inner gantry 103. The straight rack 4011 meshes with the gear plate 405. A spring spring for resetting the first connecting shaft 404 is provided at the end of the first connecting shaft 404.

[0040] Specifically, when the goods are lifted to a lower height for transfer, during the lifting process of the limit baffle 202 and the fork body 203, the toothed disc 405 is rotated under the action of the rack 4011 to transfer the goods to the designated position. When the goods are lifted to a higher position, the toothed disc 405 disengages from the rack 4011, and the first connecting shaft 404 can be reset under the action of the spring, thereby driving the limit frame 403 to reset.

[0041] Please refer to this carefully. Figure 8 , Figure 9 The inner wall of the first rectangular cavity is provided with a strip-shaped opening that penetrates the limiting baffle 202, and the strip-shaped opening corresponds to the gear disk 405.

[0042] Specifically, this facilitates the rotation of the gear plate 405 under the action of the spur rack 4011.

[0043] Please refer to this carefully. Figure 9 , Figure 11 The rectangular plate 401 has a second rectangular cavity inside, and a connecting box 406 is fixed on the inner wall of the rectangular cavity. The two sides of the connecting box 406 have rotating holes that pass through the connecting box 406, and the inner wall of the rotating hole is rotatably connected to the surface of the rotating shaft 402.

[0044] Specifically, under the action of the rotating shaft 402, the limiting frame 403 can rotate with the rotating shaft 402.

[0045] Please refer to this carefully. Figure 9 , Figure 11The inner wall of the connecting box 406 is rotatably provided with a second connecting shaft 407, and a first bevel gear 408 that meshes with each other is fixed at one end of the second connecting shaft 407 and the surface of the rotating shaft 402.

[0046] Specifically, during the rotation of the second connecting shaft 407, the rotating shaft 402 can be driven to rotate automatically under the action of the two first bevel gears 408.

[0047] Please refer to this carefully. Figure 9 , Figure 11 The other end of the second connecting shaft 407 extends into the interior of the second rectangular cavity and is rotatably connected to the inner wall of the second rectangular cavity. The inner walls of the second rectangular cavity and the connecting box 406 are provided with through holes that are rotatably connected to the surface of the second connecting shaft 407. The inner top wall of the second rectangular cavity is rotatably provided with a third connecting shaft 409 extending into the interior of the first rectangular cavity. The bottom end of the third connecting shaft 409 and the surface of the second connecting shaft 407 are both fixed with a second bevel gear 4010 that meshes with each other. The top end of the third connecting shaft 409 and the surface of the first connecting shaft 404 are both fixed with a third bevel gear 4012 that meshes with each other.

[0048] Specifically, when the first connecting shaft 404 rotates, the second connecting shaft 409 is driven to rotate by the action of the two third bevel gears 4012. At the same time, during the rotation of the third connecting shaft 409, the second connecting shaft 407 is driven to rotate automatically by the action of the two second bevel gears 4010.

[0049] In this embodiment, by setting a limiting mechanism 400, when the mast is transferring goods, when the fork body 203 lifts the goods to a lower height for transfer, the limiting baffle 202 moves upward, which can drive the gear plate 405 to rotate under the action of the rack 4011. The rotation of the gear plate 405 drives the first connecting shaft 404 to rotate. The rotation of the first connecting shaft 404 drives the third connecting shaft 409 to rotate under the action of the two third bevel gears 4012. The rotation of the third connecting shaft 409 drives the second connecting shaft 407 to rotate under the action of the two second bevel gears 4010. The rotation of the second connecting shaft 407 drives the rotating shaft 402 to rotate under the action of the two first bevel gears 408. The rotation of the rotating shaft 402 drives the limiting frame 403 to rotate 90 degrees, limiting the front end of the goods on the fork body 203, preventing the goods from slipping off the front end of the fork body 203 during the transfer, and achieving the purpose of effectively protecting the goods during the transfer.

[0050] It is worth noting that the rack 4011 is installed on one side surface of the inner mast 103. When using the fork body 203 to move the goods, it is not necessary to lift the goods to a high height. It is only necessary to lift the goods to a lower and suitable height so that the goods are off the ground. During this process, the toothed disc 405 is still engaged with the rack 4011, which can ensure the stability of the limit frame 403. When the goods are moved to the designated position and lifted to a higher position, the toothed disc 405 disengages from the rack 4011, and the first connecting shaft 404 can be reset under the action of the spring, which can drive the limit frame 403 to reset. At this time, when the goods are operated at a higher position, the limit frame 403 does not affect the picking and placing of the goods.

[0051] Working principle: In actual use, when goods need to be lifted to a higher position, the electric hydraulic cylinder 309 is activated to deliver hydraulic oil to the first hydraulic cylinder 303, driving the first hydraulic cylinder 303 to extend. The extension of the first hydraulic cylinder 303 drives the limit baffle 202 to move upward via the first transmission chain 305, thereby causing the lifting plate 201 to move upward on the inner walls of the two inner masts 103. At the same time, it drives the fork body 203 to move upward to lift the goods. When the first hydraulic cylinder 303 has extended to its maximum, the electric hydraulic cylinder 309 injects oil into the second hydraulic cylinder 306, causing the second hydraulic cylinder 306 to extend. The extension of the second hydraulic cylinder 306 drives the connecting plate 301 to move upward via the second transmission chain 308. The upward movement of the connecting plate 301 drives the first hydraulic cylinder 303 and the fork body 203 to move upward, and also drives the inner mast 103 to move upward inside the outer mast 102, thereby achieving the purpose of double lifting and thus realizing the lifting of goods. In operations involving high-load cargo, when the fork body 203 lifts the cargo to a lower height for transfer, the upward movement of the limit baffle 202, under the action of the rack 4011, drives the gear disc 405 to rotate. The rotation of the gear disc 405 drives the first connecting shaft 404 to rotate. The rotation of the first connecting shaft 404, under the action of the two third bevel gears 4012, drives the third connecting shaft 409 to rotate. The rotation of the third connecting shaft 409, under the action of the two second bevel gears 4010, drives the second connecting shaft 407 to rotate. The rotation of the second connecting shaft 407, under the action of the two first bevel gears 408, drives the rotating shaft 402 to rotate. The rotation of the rotating shaft 402 drives the limit frame 403 to rotate 90 degrees, limiting the front end of the cargo on the fork body 203 and preventing the cargo from slipping off the front end of the fork body 203 during cargo transfer, thus achieving the purpose of effectively protecting the cargo during cargo transfer.

Claims

1. A dual-lift, two-cylinder, two-stage fully free gantry, characterized in that: It includes a support frame (100), a fork mechanism (200), and a lifting mechanism (300). The support frame (100) includes a bottom support plate (101) and an outer frame (102) fixed on the upper surface of the bottom support plate (101). An inner frame (103) is slidably provided on the inner wall of the outer frame (102). The fork mechanism (200) includes two lifting plates (201) that are slidably disposed on the inner wall of the inner mast (103), and the ends of the two lifting plates (201) are fixedly provided with limiting baffles (202), and the surface of the limiting baffles (202) is fixedly provided with two symmetrical fork bodies (203). The lifting mechanism (300) includes a connecting plate (301) fixed to the inner wall of the inner gantry (103). A mounting block (302) is fixed to the surface of the connecting plate (301). A first hydraulic cylinder (303) is fixed to the upper surface of the mounting block (302). A first transmission pulley (304) is provided at the top of the telescopic end of the first hydraulic cylinder (303). A first transmission chain (305) is slidably provided on the surface of the first transmission pulley (304). The lifting mechanism (300) also includes a second hydraulic cylinder (306) fixed to the upper surface of the bottom support plate (101) and a second transmission pulley (307) provided at the top of the telescopic end of the second hydraulic cylinder (306). A second transmission chain (308) is slidably provided on the surface of the second transmission pulley (307). A fixing plate is fixed to the surface of the outer gantry (102), and an electric hydraulic cylinder (309) for injecting oil into the first hydraulic cylinder (303) and the second hydraulic cylinder (306) is provided on the surface of the fixing plate.

2. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 1, characterized in that, One end of the first transmission chain (305) is fixedly connected to the surface of the first hydraulic cylinder (303) through the first connecting block, and the other end of the first transmission chain (305) is fixedly connected to the surface of the limiting baffle (202) through the second connecting block.

3. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 1, characterized in that, One end of the second transmission chain (308) is fixedly connected to the surface of the second hydraulic cylinder (306) through the third connecting block, and the other end of the second transmission chain (308) is fixedly connected to the upper surface of the connecting plate (301) through the fourth connecting block.

4. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 1, characterized in that, A limiting mechanism (400) is provided between the two fork bodies (203), the limiting mechanism (400) being used to limit the goods on the fork bodies (203) when the goods are transferred through the fork bodies (203).

5. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 4, characterized in that, The limiting mechanism (400) includes a rectangular plate (401) fixed on the surface of the limiting baffle (202) and located between the two fork bodies (203). The rectangular plate (401) has a rectangular opening at its end. A rotating shaft (402) is rotatably provided on the inner wall of the rectangular opening, and a limiting frame (403) is fixed on the surface of the rotating shaft (402).

6. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 5, characterized in that, The limiting baffle (202) has a first rectangular cavity inside, and a first connecting shaft (404) is rotatably provided on the inner wall of the first rectangular cavity. A gear plate (405) is fixed on the surface of the first connecting shaft (404), and a straight rack (4011) is fixed on one side surface of the inner gantry (103). The straight rack (4011) meshes with the gear plate (405), and a spring spring for resetting the first connecting shaft (404) is provided at the end of the first connecting shaft (404).

7. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 6, characterized in that, The inner wall of the first rectangular cavity is provided with a strip-shaped opening that penetrates the limiting baffle (202), and the strip-shaped opening corresponds to the toothed disc (405).

8. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 7, characterized in that, The rectangular plate (401) has a second rectangular cavity inside, and a connecting box (406) is fixedly installed on the inner wall of the rectangular cavity. Rotating holes that penetrate the connecting box (406) are opened on both sides of the connecting box (406), and the inner wall of the rotating hole is rotatably connected to the surface of the rotating shaft (402).

9. The dual-lift two-cylinder two-stage fully free gantry according to claim 8, characterized in that, The inner wall of the connecting box (406) is rotatably provided with a second connecting shaft (407), and one end of the second connecting shaft (407) and the surface of the rotating shaft (402) are both fixed with a first bevel gear (408) that meshes with each other.

10. The dual-lift, two-cylinder, two-stage fully free gantry according to claim 9, characterized in that, The other end of the second connecting shaft (407) extends into the interior of the second rectangular cavity and is rotatably connected to the inner wall of the second rectangular cavity. The inner walls of the second rectangular cavity and the connecting box (406) are provided with through holes that are rotatably connected to the surface of the second connecting shaft (407). The inner top wall of the second rectangular cavity is rotatably provided with a third connecting shaft (409) extending into the interior of the first rectangular cavity. The bottom end of the third connecting shaft (409) and the surface of the second connecting shaft (407) are both fixed with a second bevel gear (4010) that meshes with each other. The top end of the third connecting shaft (409) and the surface of the first connecting shaft (404) are both fixed with a third bevel gear (4012) that meshes with each other.

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