Wide-view three-stage portal frame

Abstract

The invention relates to the technical field of forklifts, and particularly discloses a wide-view three-stage portal which comprises an outer portal. The middle door frame is arranged on the outer door frame in a sliding manner; the inner door frame is arranged on the middle door frame in a sliding manner; the fork arm carrier is arranged on the inner portal frame in a sliding manner; the driving part is used for driving the middle door frame to slide; the two sets of driving mechanisms are located on the two sides of the inner door frame correspondingly, each driving mechanism comprises an inner oil cylinder, a chain wheel base, a chain wheel and a chain, a cylinder body of each inner oil cylinder is arranged on the middle door frame, a piston rod of each inner oil cylinder is fixedly connected with the corresponding chain wheel base, each chain wheel base is fixedly connected with the inner door frame, and each chain wheel is rotationally connected to the corresponding chain wheel base; the chain is meshed with the chain wheel, and the two ends of the chain are fixedly connected with the middle door frame and the fork arm carrier respectively. By optimizing the design of the portal frame, the influence of the lifting oil cylinder in the middle on the sight of a driver is reduced, and the safety and convenience of the operation process are improved; each stage of gantry is rigidly supported by an oil cylinder, so that the stability is higher.

Description

Technical Field

[0001] The present application relates to the technical field of forklifts, and in particular to a three-stage gantry with a wide field of view. Background Art

[0002] At present, forklifts are widely used in warehouses or other occasions, usually to stack goods or take goods from high places. The forklift mast is the mechanism for lifting goods on the forklift, which consists of an inner mast, an outer mast, a fork frame, a sprocket, a chain and a lifting cylinder.

[0003] The three-level gantry includes an outer gantry, a middle gantry and an inner gantry. The three-level gantry relies on two sets of movable pulley mechanisms to realize the lifting action of the gantry. The oil cylinder lifts the middle gantry, and drives the inner gantry through the chain. The middle gantry and the inner gantry are lifted synchronously. The lifting oil cylinder on the inner gantry drives the fork frame to lift. The lifting oil cylinder is located in the middle of the inner gantry, which not only takes up a large space, but also easily blocks the driver's line of sight, resulting in inconvenient operation and safety hazards. Especially in a narrow working environment, the driver needs to frequently adjust the viewing angle, which increases the difficulty of operation and the risk of accidents. Therefore, how to optimize the gantry design and reduce the impact of the lifting oil cylinder on the driver's line of sight has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to prevent the lifting cylinder from blocking the driver's view, the present application provides a three-stage gantry with a wide field of view.

[0005] The wide-view three-stage gantry provided in this application adopts the following technical solution: A three-stage gantry with a wide field of view, comprising: External door frame; The middle door frame is slidably arranged on the outer door frame; An inner door frame is slidably arranged on the middle door frame; A fork frame is slidably arranged on the inner mast; A driving member, arranged on the outer door frame, for driving the middle door frame to slide; The driving mechanism is provided with two groups and is respectively located on both sides of the inner mast. The driving mechanism includes an inner cylinder, a sprocket seat, a sprocket and a chain. The cylinder body of the inner cylinder is fixedly connected to the middle mast, the piston rod end of the inner cylinder is fixedly connected to the sprocket seat, the sprocket seat is fixedly connected to the inner mast, the sprocket is rotatably connected to the sprocket seat, the chain is wound around the sprocket and meshed with the sprocket, one end of the chain is fixedly connected to the middle mast, and the other end of the chain is fixedly connected to the fork frame.

[0006] By adopting the above technical scheme, the multi-stage sliding arrangement of the outer mast, middle mast, inner mast and fork frame, in conjunction with the driving parts and two sets of driving mechanisms, can make the middle mast, inner mast and fork frame slide in the vertical direction, thereby realizing the lifting and lowering of the fork frame and carrying the goods; since the driving mechanism is arranged on both sides of the inner mast, it effectively avoids the blocking of the driver's line of sight caused by the lifting cylinder located in the middle of the inner mast in the traditional design while ensuring the lifting effect, thereby expanding the driver's field of vision and improving the safety and convenience of operation.

[0007] Optionally, the driving member includes an external oil cylinder, a cylinder body of the external oil cylinder is fixedly connected to the outer mast, and an end of a piston rod of the external oil cylinder is fixedly connected to the middle mast.

[0008] By adopting the above technical solution, the sliding of the piston rod of the outer cylinder can drive the middle mast to rise and fall; compared with the traditional structure in which the middle mast is driven to rise and fall by the cylinder and the inner mast is driven to rise and fall by the sprocket chain, the lifting and lowering of the middle mast and the inner mast in the present application are both controlled by the cylinder, so that each level of the mast is rigidly supported by the cylinder, which helps to improve the stability during the lifting process.

[0009] Optionally, the driving member and the driving mechanism are both arranged on a side of the outer mast away from the fork frame.

[0010] By adopting the above technical solution, the device is suitable for scenes such as steel smelters and metal heat processing plants, and the oil cylinder is not easily damaged when high-temperature molten iron and other metals splash.

[0011] Optionally, a center hole for pressure oil to flow into is opened in the piston rod of the outer cylinder, and a first joint connected to the center hole is fixedly connected to the end of the piston rod of the outer cylinder outside the cylinder body, and a second joint connected to the inside of the cylinder body is fixedly connected to the cylinder body of the inner cylinder, and an oil pipe is connected between the second joint and the first joint.

[0012] By adopting the above technical solution, a central hole for the pressure oil to flow in is opened in the piston rod of the outer cylinder, so that the pressure oil can be directly transmitted to the inner cylinder through the piston rod, reducing the complexity of the external hose connection. Since there is no need to set up an external hose connection, when the piston rod slides, it is not easy to cause the pipeline to be entangled and the line of sight to be blocked, thereby improving the reliability and maintenance convenience of the system.

[0013] Optionally, the oil pipeline is a hard steel pipe.

[0014] By adopting the above technical solution, the use of hard steel pipes as oil pipes can effectively improve the stability and durability of the system and reduce the risk of pressure oil leakage due to aging or damage of the hose, thereby ensuring the safety and reliability of the gantry lifting process; at the same time, the hard steel pipes have higher rigidity, which can avoid pressure loss caused by oil pipe deformation and ensure the working efficiency of the hydraulic system.

[0015] Optionally, a three-way valve is fixedly connected to the outer door frame, and two interfaces on the three-way valve are respectively connected to the interior of the bottom ends of the cylinder bodies of the two outer oil cylinders.

[0016] By adopting the above technical solution, the setting of the three-way valve can effectively realize the synchronous control of the two external cylinders on the left and right sides, ensuring that the two external cylinders maintain synchronous movement during operation, thereby improving the stability and safety of the gantry lifting process.

[0017] Optionally, a heat dissipation mechanism is provided at the top of the inner mast, and the heat dissipation mechanism includes a water tank, a heat dissipation pipe, a first pump body and a radiator. The water tank is fixedly connected to the inner mast, and a first flow channel for cooling water to flow is opened in the sprocket seat. The two ends of the first flow channel are connected to the water tank through a heat dissipation pipe, and the first pump body and the radiator are both arranged on the pipeline of the heat dissipation pipe.

[0018] By adopting the above technical solution, when the fork frame is frequently lifted and lowered, the sprocket will rotate frequently, so the sprocket is easy to heat up. The heat dissipation mechanism can effectively reduce the temperature of the sprocket during operation, thereby improving the service life and reliability of the sprocket.

[0019] Optionally, the sprocket seat is made of copper alloy.

[0020] By adopting the above technical solution, the sprocket seat has good thermal conductivity while ensuring high mechanical strength and wear resistance, which helps to quickly transfer heat and thus achieve cooling of the sprocket.

[0021] Optionally, a second flow channel for pressure oil circulation is provided in the sprocket seat, a second pump body is arranged on the pipeline of the second flow channel in the sprocket seat, and a first circulation flow channel and a second circulation flow channel for pressure oil circulation are provided in the piston rod of the inner oil cylinder, the two ends of the first circulation flow channel are respectively connected to the interior of the cylinder body and the inlet of the second flow channel, and the two ends of the second circulation flow channel are respectively connected to the interior of the cylinder body and the outlet of the second flow channel, so that the pressure oil in the cylinder body of the inner oil cylinder can circulate among the first circulation flow channel, the second flow channel and the second circulation flow channel.

[0022] By adopting the above-mentioned technical scheme, the second flow channel opened in the sprocket seat and the second pump body arranged thereon, as well as the first circulation flow channel and the second circulation flow channel opened in the piston rod of the inner oil cylinder, the pressure oil in the inner oil cylinder can circulate between these flow channels. When the pressure oil flows through the second flow channel, the pressure oil in the second flow channel can exchange heat with the cooling water in the first flow channel, thereby realizing the cooling of the pressure oil, and the pressure oil can be kept within the normal working temperature range, thereby ensuring the use effect of the pressure oil.

[0023] Optionally, rollers are provided between the outer mast and the middle mast, between the middle mast and the inner mast, and between the inner mast and the fork frame.

[0024] By adopting the above technical solution, the setting of the rollers can significantly reduce the friction between the door frames, improve the sliding smoothness of the door frames, thereby reducing energy loss and extending the service life of the device; at the same time, the rollers can also effectively reduce the vibration and impact during the movement of the door frames, further improving the operational stability and safety of the forklift.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The driving mechanism is arranged on both sides of the inner mast to avoid the blocking of the driver's sight by the lifting cylinder in the middle, improve the driver's field of vision, and enhance the safety and convenience of operation.

[0026] 2. The heat dissipation mechanism can dissipate heat and cool down the sprocket to avoid the sprocket from overheating, thereby extending the service life of the sprocket and chain.

[0027] 3. When the heat dissipation mechanism is working, it can not only cool down the sprocket, but also dissipate heat and cool down the pressure oil in the oil cylinder, so that the pressure oil can be kept within the normal working temperature range, which helps to ensure the use effect of the pressure oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of the present application from another perspective; Figure 3 is a structural schematic diagram of Example 1 of the present application for illustrating the connection relationship between the first connector, the second connector and the infusion tube; Figure 4 is a cross-sectional view of Example 1 of the present application along the axis of the outer cylinder; Figure 5 is a cross-sectional view of embodiment 1 of the present application along the axis of the inner cylinder; Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present application; Figure 7 is a cross-sectional view of Example 2 of the present application for showing the first flow channel; Figure 8 yes Figure 7 The enlarged schematic diagram of point A in the middle; Fig. 9 is a cross-sectional view of Example 2 of the present application for showing the second flow channel; Fig.10 yes Fig. 9 The enlarged schematic diagram of point B in the middle; Fig.11 yes Fig. 9 Enlarged schematic diagram of point C in the middle.

[0029] Figure numerals: 1. outer mast; 2. middle mast; 21. support block; 3. inner mast; 4. fork frame; 5. outer cylinder; 6. driving mechanism; 61. inner cylinder; 62. sprocket seat; 621. first flow channel; 622. second flow channel; 623. second pump body; 63. sprocket; 64. chain; 7. center hole; 8. first joint; 9. second joint; 10. oil pipeline; 11. three-way valve; 12. heat dissipation mechanism; 121. water tank; 122. heat dissipation pipe; 123. first pump body; 124. radiator; 13. first circulation flow channel; 14. second circulation flow channel; 15. roller. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-11 This application is described in further detail.

[0031] Example 1 The present application embodiment discloses a wide-view three-stage gantry. Figure 1 The wide-view three-stage gantry includes an outer gantry 1, a middle gantry 2, an inner gantry 3 and a fork frame 4. The outer gantry 1 is fixed, the middle gantry 2 is slidably arranged in the outer gantry 1 along the vertical direction, the inner gantry 3 is slidably arranged in the middle gantry 2 along the vertical direction, and the fork frame 4 is slidably arranged in the inner gantry 3 along the vertical direction. A fork is slidably arranged on the fork frame 4 along the horizontal direction, and the fork is used to fork up the goods, so the fork frame 4 drives the fork to slide along the vertical direction to realize the lifting and lowering of the goods. The outer gantry 1 is rotatably connected with a roller 15 that abuts against the middle gantry 2, the middle gantry 2 is rotatably connected with a roller 15 that abuts against the inner gantry 3, and the inner gantry 3 is rotatably connected with a roller 15 that abuts against the fork frame 4, thereby improving the stability of the sliding process of the middle gantry 2, the inner gantry 3 and the fork frame 4.

[0032] Reference Figure 2 and Figure 3A driving member is provided on the side of the outer mast 1 away from the fork frame 4. The driving member is an outer cylinder 5, which is vertically arranged. The cylinder body of the outer cylinder 5 is fixedly connected to the bottom end of the outer mast 1, and the piston rod end of the outer cylinder 5 faces upward and is fixedly connected to the top end of the middle mast 2. Therefore, the outer cylinder 5 can drive the middle mast 2 to slide in the vertical direction.

[0033] A driving mechanism 6 for driving the inner mast 3 and the fork frame 4 to slide is arranged on one side of the middle mast 2 away from the fork frame 4. The driving mechanism 6 is arranged in two groups and is respectively located on both sides of the middle mast 2. The driving mechanism 6 comprises an inner cylinder 61, a sprocket seat 62, a sprocket 63 and a chain 64. The inner cylinder 61 is arranged vertically, the cylinder body of the inner cylinder 61 is fixedly connected to the bottom end of the middle mast 2, the piston rod end of the inner cylinder 61 is vertically upward and fixedly connected to the sprocket seat 62, and the top of the sprocket seat 62 is fixedly connected to the top of the inner mast 3. A support block 21 is welded to the top of the middle mast 2, and the support block 21 is arranged in an L shape; the sprocket 63 is rotatably connected to the sprocket seat 62, and the chain 64 is wound around the sprocket 63 and meshed with the sprocket 63; both ends of the chain 64 are downward, one end of the chain 64 is fixedly connected to the support block 21, and the other end of the chain 64 is fixedly connected to the fork frame 4.

[0034] Therefore, when the piston rod of the inner cylinder 61 slides upward, the inner mast 3 can be lifted up; at the same time, when the piston rod of the inner cylinder 61 slides upward, the sprocket 63 can be driven to slide upward. Since one end of the chain 64 is fixed and the chain 64 is meshed with the sprocket 63, the upward sliding sprocket 63 can make the movable end of the chain 64 slide upward, thereby making the chain 64 drive the fork frame 4 to slide upward; that is, the inner cylinder 61 can drive the inner mast 3 and the fork frame 4 to slide at the same time.

[0035] Reference Figure 4 and Figure 5 In order to facilitate the operation of the outer cylinder 5 and the inner cylinder 61, a pipeline for the circulation of pressure oil is provided between the outer cylinder 5 and the inner cylinder 61. A three-way valve 11 is fixedly connected to the bottom end of the outer mast 1, one of the interfaces of the three-way valve 11 is connected to the source for oil supply, and the other two interfaces of the three-way valve 11 are respectively connected to the inside of the cylinder bodies at the bottom ends of the two outer cylinders 5. Therefore, the pressure oil can flow into the cylinder body of the outer cylinder 5 through the three-way valve 11.

[0036] A center hole 7 is coaxially formed in the piston rod of the outer cylinder 5, and the bottom end of the center hole 7 is open and communicated with the inside of the cylinder body. A first joint 8 is fixedly connected to the top of the piston rod of the outer cylinder 5, and the first joint 8 is communicated with the center hole 7. A second joint 9 is fixedly connected to the top of the cylinder body of the inner cylinder 61, and the second joint 9 is communicated with the inside of the cylinder body of the inner cylinder 61. An oil delivery pipe 10 is fixedly connected between the first joint 8 and the second joint 9, and the oil delivery pipe 10 is a hard steel pipe.

[0037] In the initial state, the piston rod of the outer cylinder 5 is in an unextended state, and the bottom end of the piston rod is pressed against the inner wall of the bottom end of the cylinder body. When the three-way valve 11 is opened and the pressure oil is introduced into the inside, the pressure oil can flow into the bottom end of the cylinder body of the outer cylinder 5, then flow upward along the center hole 7, and then flow into the first joint 8 from the top of the center hole 7, and then flow into the second joint 9 through the oil pipe 10, and then enter the cylinder body of the inner cylinder 61 through the second joint 9. The pressure oil inside the cylinder body of the inner cylinder 61 increases, and the pressure inside the cylinder body of the inner cylinder 61 increases, and then the piston rod of the inner cylinder 61 is pushed upward, thereby lifting the inner mast 3 and the fork frame 4. When the piston rod of the inner cylinder 61 moves to the top, the piston rod of the inner cylinder 61 can no longer move upward. At this time, with the continuous injection of pressure oil, the pressure in the cylinder body of the outer cylinder 5 gradually increases, so that the piston rod of the outer cylinder 5 slides upward and lifts the middle mast 2.

[0038] When it is necessary to lower the fork frame 4, the injection of pressure oil into the three-way valve 11 can be stopped. Then, under the action of the high-pressure pressure oil inside the outer cylinder 5 and the inner cylinder 61, the pressure oil in the cylinder body will flow out through the three-way valve 11. Without the action of the pressure oil, the piston rods of the outer cylinder 5 and the inner cylinder 61 can move downward, thereby lowering the fork frame 4.

[0039] The implementation principle of Example 1 is as follows: in the initial state, the piston rods of the outer cylinder 5 and the inner cylinder 61 are both in the unraised state, and the fork frame 4 is located at the bottom of the inner mast 3. When the fork frame 4 needs to be raised upward, pressure oil can be introduced into the three-way valve 11, and the pressure oil can first flow into the bottom of the cylinder body of the outer cylinder 5, and then flow upward along the center hole 7 on the piston rod of the outer cylinder 5, and then flow into the cylinder body of the inner cylinder 61 through the first joint 8, the oil pipe 10 and the second joint 9 in sequence. As the pressure oil in the cylinder body of the inner cylinder 61 increases, the pressure in the cylinder body of the inner cylinder 61 gradually increases, pushing the piston rod of the inner cylinder 61 to slide upward, so that the inner mast 3 and the fork frame 4 are raised synchronously.

[0040] When the piston rod of the inner cylinder 61 slides to the top, the pressure oil can no longer flow into the cylinder body of the inner cylinder 61. At this time, with the continuous injection of pressure oil, the pressure oil in the cylinder body of the outer cylinder 5 gradually increases, causing the piston rod of the outer cylinder 5 to slide upward, thereby causing the middle mast 2 to rise upward, further lifting the fork frame 4.

[0041] When it is necessary to drop the fork frame 4, the supply of pressure oil can be stopped, and the high-pressure pressure oil in the cylinder bodies of the outer cylinder 5 and the inner cylinder 61 can be discharged outward. Without the effect of the pressure oil, the piston rods of the outer cylinder 5 and the inner cylinder 61 can slide down, thereby moving the middle mast 2, the inner mast 3 and the fork frame 4 downward.

[0042] Example 2 Reference Figure 6 , Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 is that a heat dissipation mechanism 12 is provided at the top of the inner door frame 3 in this embodiment, and the heat dissipation mechanism 12 includes a water tank 121, a heat dissipation pipe 122, a first pump body 123 and a radiator 124. The water tank 121 is fixedly connected to the top wall of the inner door frame 3, and two heat dissipation pipes 122 are provided, and both are connected to the water tank 121. A first flow channel 621 is provided in the sprocket seat 62, and the inlet of the first flow channel 621 is connected to one of the heat dissipation pipes 122, and the outlet of the first flow channel 621 is connected to the other heat dissipation pipe 122. The first pump body 123 is fixedly connected to the outer wall of the water tank 121, and the water inlet of the first pump body 123 is connected to the inside of the water tank 121, and the water outlet of the first pump body 123 is connected to the heat dissipation pipe 122. The radiator 124 is disposed on the top wall of the inner door frame 3 , and the radiator 124 is disposed on the outer side of the heat dissipation pipe 122 , so that the cooling water flowing in the heat dissipation pipe 122 can be cooled.

[0043] Therefore, under the action of the first pump body 123, the cooling water in the water tank 121 can flow into the first flow channel 621, thereby cooling the sprocket 63. Then, the cooling water after heat exchange is cooled by the radiator 124 and then flows into the water tank 121, thereby circulating the cooling water.

[0044] The sprocket seat 62 is made of copper alloy, so it has good thermal conductivity while ensuring good mechanical strength and wear resistance, which is beneficial to heat transfer, thereby ensuring a cooling effect on the sprocket 63 .

[0045] Reference Fig. 9 , Fig.10 and Fig.11 Furthermore, a second flow channel 622 is provided in the sprocket seat 62, and the inlet and outlet of the second flow channel 622 are both arranged downward. A second pump body 623 is fixedly provided on the pipeline of the second flow channel 622 in the sprocket seat 62, and the second pump body 623 is a micro water pump, and the second pump body 623 is used to drive the pressure oil in the second flow channel 622 to circulate. A first circulation flow channel 13 and a second circulation flow channel 14 are provided in the piston rod of the inner oil cylinder 61 in the vertical direction; the bottom end of the first circulation flow channel 13 is connected to the inside of the cylinder body of the inner oil cylinder 61, and the top end of the first circulation flow channel 13 is connected to the inlet of the second flow channel 622; the bottom end of the second circulation flow channel 14 is connected to the inside of the cylinder body of the inner oil cylinder 61, and the top end of the second circulation flow channel 14 is connected to the outlet of the second flow channel 622. Therefore, when the cylinder body of the inner cylinder 61, the first circulation channel 13, the second circulation channel 14 and the second channel 622 are all filled with pressurized oil, the piston rod of the inner cylinder 61 can slide upward.

[0046] Under the action of the second pump body 623, the pressure oil on one side of the cylinder body of the inner oil cylinder 61 can flow to the other side of the cylinder body through the first circulation channel 13, the second flow channel 622 and the second circulation channel 14, thereby realizing the circulation of the pressure oil; since the second flow channel 622 is opened in the sprocket seat 62, and the second flow channel 622 and the first flow channel 621 are close to each other, the cooling water flowing in the first flow channel 621 can cool the pressure oil flowing in the second flow channel 622, thereby avoiding the temperature of the pressure oil being too high and ensuring the use effect of the pressure oil.

[0047] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A three-stage gantry with a wide field of view, characterized in that: include: External door frame (1); A middle door frame (2) is slidably arranged on the outer door frame (1); An inner door frame (3) is slidably arranged on the middle door frame (2); A fork frame (4) is slidably arranged on the inner door frame (3); A driving member, arranged on the outer door frame (1) and used for driving the middle door frame (2) to slide; The driving mechanism (6) is provided with two groups and is respectively located on both sides of the inner mast (3). The driving mechanism (6) comprises an inner cylinder (61), a sprocket seat (62), a sprocket (63) and a chain (64). The cylinder body of the inner cylinder (61) is fixedly connected to the middle mast (2). The end of the piston rod of the inner cylinder (61) is fixedly connected to the sprocket seat (62). The sprocket seat (62) is fixedly connected to the inner mast (3). The sprocket (63) is rotatably connected to the sprocket seat (62). The chain (64) is wound around the sprocket (63) and meshed with the sprocket (63). One end of the chain (64) is fixedly connected to the middle mast (2), and the other end of the chain (64) is fixedly connected to the fork frame (4).

2. A wide-view three-stage gantry according to claim 1, characterized in that: The driving member comprises an outer cylinder (5), a cylinder body of the outer cylinder (5) is fixedly connected to the outer mast (1), and an end of a piston rod of the outer cylinder (5) is fixedly connected to the middle mast (2).

3. A wide-view three-stage gantry according to claim 2, characterized in that: The driving member and the driving mechanism (6) are both arranged on a side of the outer mast (1) away from the fork frame (4).

4. A three-stage gantry with wide field of view according to claim 2, characterized in that: A center hole (7) for the pressure oil to flow into is formed in the piston rod of the outer cylinder (5); a first joint (8) in communication with the center hole (7) is fixedly connected to one end of the piston rod of the outer cylinder (5) located outside the cylinder body; a second joint (9) in communication with the inside of the cylinder body is fixedly connected to the cylinder body of the inner cylinder (61); and an oil delivery pipe (10) is connected between the second joint (9) and the first joint (8).

5. A wide-view three-stage gantry according to claim 4, characterized in that: The oil delivery pipe (10) is a hard steel pipe.

6. The wide-view three-stage gantry according to claim 2, characterized in that: A three-way valve (11) is fixedly connected to the outer door frame (1), and two interfaces on the three-way valve (11) are respectively connected to the interior of the bottom ends of the cylinder bodies of the two outer oil cylinders (5).

7. The wide-view three-stage gantry according to claim 1, characterized in that: A heat dissipation mechanism (12) is provided at the top of the inner door frame (3), and the heat dissipation mechanism (12) comprises a water tank (121), a heat dissipation pipe (122), a first pump body (123) and a radiator (124); the water tank (121) is fixedly connected to the inner door frame (3); a first flow channel (621) for cooling water to flow is provided in the sprocket seat (62); both ends of the first flow channel (621) and the water tank (121) are connected via the heat dissipation pipe (122); and the first pump body (123) and the radiator (124) are both provided on the pipeline of the heat dissipation pipe (122).

8. The wide-view three-stage gantry according to claim 7, characterized in that: The sprocket seat (62) is made of copper alloy.

9. The wide-view three-stage gantry according to claim 7, characterized in that: The sprocket seat (62) is provided with a second flow channel (622) for circulating pressure oil, and a second pump body (623) is arranged on the pipeline of the second flow channel (622) in the sprocket seat (62). The piston rod of the inner oil cylinder (61) is provided with a first circulation flow channel (13) and a second circulation flow channel (14) for circulating pressure oil, and the two ends of the first circulation flow channel (13) are respectively connected to the inside of the cylinder body and the inlet of the second flow channel (622), and the two ends of the second circulation flow channel (14) are respectively connected to the inside of the cylinder body and the outlet of the second flow channel (622), so that the pressure oil in the cylinder body of the inner oil cylinder (61) can circulate between the first circulation flow channel (13), the second flow channel (622) and the second circulation flow channel (14).

10. The wide-view three-stage gantry according to claim 1, characterized in that: Rollers (15) are provided between the outer door frame (1) and the middle door frame (2), between the middle door frame (2) and the inner door frame (3), and between the inner door frame (3) and the fork frame (4).

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