Lift-variable portal crane

Abstract

The utility model discloses a portal crane with variable lift, which belongs to the technical field of portal cranes and comprises a cross beam, two supporting legs are arranged on the left side and the right side of the lower end face of the cross beam respectively, the supporting legs are arranged in a sectional mode, each supporting leg comprises a top rod at the top and a bottom rod at the bottom, and a plurality of supporting rods are arranged between the top rods and the bottom rods. The top ends of the ejector rods are hinged to the beam. During production, the height of the cross beam can be integrally reduced by removing the same number of the supporting rods in the middle of each supporting leg, or the height of the cross beam can be integrally increased by increasing the same number of the supporting rods, and after the height is determined through field surveying and mapping, the number of the supporting rods between the top rod and the bottom rod can be determined. The requirements of customers can be met through the set top rods, the set supporting rods and the set bottom rods, the cross beams can be produced only according to the specifications of the cross beams determined during field surveying and mapping, then the top rods, the bottom rods and the set number of supporting rods and the cross beams are assembled, and the purpose of improving the production efficiency is achieved.

Description

A gantry crane with variable lift Technical Field

[0001] This utility model relates to a gantry crane, and more particularly to a variable-lift gantry crane. Background Technology

[0002] The lifting height of a gantry crane refers to the distance the hook is raised from its lowest position to its highest position. Different models of gantry cranes have different lifting heights: conventional gantry cranes typically have a lifting height between 10 and 40 meters, suitable for general cargo lifting needs; certain models of gantry cranes can reach a lifting height of 120 meters.

[0003] Research on conventional gantry cranes reveals that their height ranges widely, from 10 to 40 meters. Conventional gantry cranes are primarily customized for different applications. During production, a large number of conventional gantry cranes undergo on-site surveys based on the customer's site requirements to determine the crane's height, typically within the 10-40 meter range. Therefore, each shipment of a conventional gantry crane requires on-site surveying and redesign, resulting in a repetitive process, a large workload, cumbersome preparation, delayed start-up, and hindered production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a variable-lift gantry crane, which effectively solves the problem of low production efficiency caused by the cumbersome manufacturing process of gantry cranes in the prior art.

[0005] The present invention adopts the following technical solution: a variable lift gantry crane, including a crossbeam, two legs are provided on the left and right sides of the lower end face of the crossbeam, the legs are segmented, the legs include a top rod at the top and a bottom rod at the bottom, several support rods are provided between the top rod and the bottom rod, the top of the top rod is hinged to the crossbeam, a lifting device is slidably provided on the crossbeam, and a traveling mechanism is hinged to the bottom of each leg.

[0006] Furthermore, the walking mechanism includes a base plate hinged to the bottom end of the base rod, and a plurality of roller assemblies are fixedly disposed on the lower end surface of the base plate.

[0007] Furthermore, flanges are fixedly installed at the top of the bottom rod, the bottom of the top rod, and both ends of the support rod. The bottom rod and the corresponding support rod are fixed together by flanges and fixing bolts, the support rods are fixed together by flanges and fixing bolts, and the top rod and the corresponding support rod are fixed together by flanges and fixing bolts.

[0008] Furthermore, a telescopic mechanism is provided between the two base plates on the same side, and an adjustment device is provided on the telescopic mechanism. The adjustment device is used to adjust the length of the telescopic mechanism and lock the telescopic mechanism's telescopic function.

[0009] Furthermore, the telescopic mechanism includes a base plate fixedly disposed on the inner side of the front base plate and an inner plate fixedly disposed on the inner side of the rear base plate, the inner plate being slidably disposed within the base plate in the front-rear direction.

[0010] Furthermore, the adjustment device includes a drive rod disposed in the substrate along the front-rear direction. The front end of the drive rod passes through the front bottom plate and is rotatably connected to the bottom plate. An adjustment threaded rod is fixedly disposed at the rear end of the drive rod. The adjustment threaded rod passes through the inner plate and the rear bottom plate. The adjustment threaded rod is threadedly connected to the inner plate and the corresponding bottom plate.

[0011] Furthermore, a sliding groove is provided on the upper end surface of the substrate, and a cover plate is fixedly provided on the upper end surface of the substrate. A sliding hole is formed between the cover plate and the sliding groove, and the inner plate is slidably disposed in the sliding hole in the front-back direction.

[0012] Furthermore, the inner side of the base rod is hinged with a diagonal brace, and the bottom end of the diagonal brace is hinged with a slider. The rear slider is slidably disposed in the inner plate along the front-back direction, and the front slider is slidably disposed in the base plate along the front-back direction. A buffer spring is fixedly disposed on the outer side of the slider, and a fixing plate is fixedly disposed on the other end of the buffer spring. The rear fixing plate is fixedly connected to the inner plate, and the front fixing plate is fixedly connected to the base plate. The buffer spring is in a compressed state.

[0013] Furthermore, both the inner plate and the base plate have slide rails on their upper surfaces. The slider is slidably disposed in the corresponding slide rail, and the fixing plate is slidably disposed in the corresponding slide rail. An end plate is fixedly disposed at the inner end of the slide rail, and a top pressure rod is threadedly connected to the end plate. The outer end of the top pressure rod is rotatably connected to the corresponding fixing plate.

[0014] Furthermore, an installation space is formed between the end of the inner plate and the slide groove. The rear end of the drive rod is located in the installation space and fixedly set with the front end of the adjusting threaded rod. Two drive blocks are slidably arranged in the inner bottom wall of the installation space in the left and right direction. Each drive block has a clamping block fixedly set on its upper end surface by an L rod. Each clamping block has an arc-shaped surface on its inner side that matches the outer surface of the drive rod. A bidirectional threaded rod is arranged in the base plate in the left and right direction. The bidirectional threaded rod is rotatably connected to the base plate. Each drive block is threadedly connected to the bidirectional threaded rod.

[0015] I. This utility model, by setting up top rods, bottom rods, support rods, and crossbeams, allows for the reduction of the overall crossbeam height during production by removing the same number of support rods from the middle of each leg, or the increase of the same number of support rods by adding them. When manufacturing gantry cranes according to customer needs, once the height is determined through on-site surveying, the number of support rods between the top rods and bottom rods can be determined. The customer's needs can be met by using the predetermined top rods, support rods, and bottom rods. Only the crossbeam specifications determined during on-site surveying need to be produced. Then, the top rods, bottom rods, and the predetermined number of support rods are assembled with the crossbeam, thus simplifying the gantry crane manufacturing process and improving production efficiency.

[0016] II. This utility model, by setting up a base plate, an inner plate, an adjusting threaded rod, and a driving rod, allows the driving rod to rotate during assembly, thereby causing the adjusting threaded rod to drive the inner plate to move back and forth within the base plate. This, in turn, causes the base plate, which is fixed inside, to move back and forth, thus achieving the purpose of adjusting the distance between the two base plates on the same side. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 is a front view of the structure of this utility model;

[0019] Figure 3 is a schematic diagram of the right-side structure of this utility model;

[0020] Figure 4 is a three-dimensional structural diagram of the base rod in this utility model;

[0021] Figure 5 is a three-dimensional structural diagram of the cover plate in this utility model;

[0022] Figure 6 is a three-dimensional structural diagram of the diagonal brace in this utility model;

[0023] Figure 7 is a three-dimensional structural diagram of the base plate in this utility model;

[0024] Figure 8 is an enlarged schematic diagram of the structure at point A in Figure 7 of this utility model;

[0025] Figure 9 is a three-dimensional structural diagram of the inner plate in this utility model;

[0026] Figure 10 is a three-dimensional structural diagram of the inner plate and the base plate in this utility model.

[0027] In the diagram, 1. Crossbeam; 2. Top rod; 3. Bottom rod; 4. Support rod; 5. Lifting device; 6. Base plate; 7. Roller assembly; 8. Flange; 9. Base plate; 10. Inner plate; 11. Drive rod; 12. Adjusting threaded rod; 13. Nut; 14. Locking nut; 15. Slide groove; 16. Cover plate; 17. Diagonal brace; 18. Slider; 19. Buffer spring; 20. Fixing plate; 21. Slide rail; 22. End plate; 23. Top pressure rod; 24. Spacing groove; 25. Drive block; 26. L-rod; 27. Clamping block; 28. Bidirectional threaded rod; 29. ​​Stop nut. Detailed Implementation

[0028] Please refer to Figures 1-10. The following is a detailed description of the present invention in conjunction with the accompanying drawings and embodiments: The variable-lift gantry crane of the present invention includes a crossbeam 1. Two legs are provided on both the left and right sides of the lower end face of the crossbeam 1. The legs are segmented and include a top rod 2 at the top and a bottom rod 3 at the bottom. Several support rods 4 are provided between the top rod 2 and the bottom rod 3. The top end of the top rod 2 is hinged to the crossbeam 1. A lifting device 5 is slidably arranged on the crossbeam 1. The lifting device 5 is used to lift materials. The bottom end of each leg is hinged to a traveling mechanism. After the lifting device 5 lifts the material, the traveling mechanism causes the legs and the crossbeam 1 to move longitudinally, thereby enabling the material lifted by the lifting device 5 to be transported longitudinally, achieving the purpose of lifting materials.

[0029] The lifting height of a gantry crane refers to the distance the hook is raised from its lowest position to its highest position. Different models of gantry cranes have different lifting heights: conventional gantry cranes typically have a lifting height between 10 and 40 meters, suitable for general cargo lifting needs; certain models of gantry cranes can reach a lifting height of 120 meters.

[0030] Research on conventional gantry cranes reveals that their height ranges widely from 10 to 40 meters. Conventional gantry cranes are primarily customized for different applications. During production, a large number of conventional gantry cranes undergo on-site surveys based on the customer's site requirements to determine the crane's height, which typically falls within the 10-40 meter range. Therefore, each manufacture of a conventional gantry crane requires on-site surveying and redesign, resulting in a repetitive process, a large workload, cumbersome preparatory work, delayed start-up, and hindered production efficiency.

[0031] To solve the above problems, each outrigger is designed in segments. By removing the same number of support rods 4 in the middle of each outrigger, the overall height of the crossbeam 1 can be reduced, or by adding the same number of support rods 4, the overall height of the crossbeam 1 can be increased. When manufacturing a gantry crane according to customer needs, the number of support rods 4 between the top rod 2 and the bottom rod 3 can be determined after on-site measurement to determine the height. Although the height may have an error compared to the height determined during on-site measurement, the height requirements of gantry cranes have a large allowable range. Therefore, the customer's needs can be met by using the predetermined top rod 2, support rod 4, and bottom rod 3. Since the top rod 2, support rod 4, and bottom rod 3 are all pre-set standards, it is only necessary to produce the crossbeam 1 according to the specifications determined during on-site measurement. Then, the top rod 2, bottom rod 3, and the predetermined number of support rods 4 are assembled with the crossbeam 1 for shipment, or assembly can be carried out on-site. After assembly, the ladder and platform are then installed and fixed.

[0032] In this embodiment, the walking mechanism includes a base plate 6 hinged to the bottom end of the base rod 3. A plurality of roller assemblies 7 are fixedly provided on the lower end surface of the base plate 6. A drive motor (not shown in the figure) is provided on the roller assembly 7. The drive motor drives the rollers in the roller assembly 7 to rotate, thereby driving the support leg and the crossbeam 1 to move in the overall front-back direction. The rollers move on the track laid in the front-back direction.

[0033] In this embodiment, flanges 8 are fixedly installed at the top of the bottom rod 3, the bottom of the top rod 2, and both ends of the support rod 4. The bottom rod 3 and the corresponding support rod 4 are fixed together by flanges 8 and fixing bolts. The support rods 4 are fixed together by flanges 8 and fixing bolts. The top rod 2 and the corresponding support rod 4 are fixed together by flanges 8 and fixing bolts. During assembly, the bottom rod 3, support rod 4 and top rod 2 are assembled and fixed.

[0034] In this embodiment, a telescopic mechanism is provided between the two base plates 6 on the same side. An adjustment device is provided on the telescopic mechanism. The adjustment device is used to adjust the length of the telescopic mechanism and lock the telescopic function. During assembly, it is necessary to adjust the distance between the two base rods 3, adjust the length of the telescopic mechanism and lock it through the adjustment device, and then install a set number of support rods 4 between the base rod 3 and the top rod 2 to complete the assembly.

[0035] In this embodiment, the telescopic mechanism includes a base plate 9 fixedly disposed on the inner side of the front base plate 6 and an inner plate 10 fixedly disposed on the inner side of the rear base plate 6. The inner plate 10 is slidably disposed in the base plate 9 in the front-back direction. In use, the inner plate 10 is adjusted to slide back and forth in the base plate 9 by adjusting the adjusting device to achieve the purpose of adjusting the distance between the two base plates 6 on the same side.

[0036] In this embodiment, the adjustment device includes a drive rod 11 disposed in the substrate 9 along the front-rear direction. The front end of the drive rod 11 passes through the front bottom plate 6 and is rotatably connected to the bottom plate 6. An adjustment threaded rod 12 is fixedly disposed at the rear end of the drive rod 11. The adjustment threaded rod 12 passes through the inner plate 10 and the rear bottom plate 6. The adjustment threaded rod 12 is threadedly connected to the inner plate 10 and the corresponding bottom plate 6. The front end of the drive rod 11 protrudes from the front bottom plate 6 and is fixedly disposed with a nut 13. In use, the drive rod 11 is rotated by applying a tool to the nut 13, which in turn drives the adjustment threaded rod 12 to rotate. This causes the adjustment threaded rod 12 to drive the inner plate 10 to move back and forth within the substrate 9, thereby driving the bottom plate 6 fixed inside to move back and forth, achieving the purpose of adjusting the distance between the two bottom plates 6 on the same side. After adjustment, a locking nut 14 is screwed onto the right end of the adjustment threaded rod 12, so that the locking nut 14 abuts against the outer surface of the rear bottom plate 6 to prevent the adjustment threaded rod 12 from rotating accidentally.

[0037] In this embodiment, a sliding groove 15 is provided on the upper end surface of the substrate 9, and a cover plate 16 is fixedly provided on the upper end surface of the substrate 9. A sliding hole is formed between the cover plate 16 and the sliding groove 15. The inner plate 10 is slidably disposed in the sliding hole in the front-back direction. When adjusting the distance between the two bottom plates 6 on the same side, the inner plate 10 moves back and forth in the sliding hole.

[0038] To increase the stability of the base rod 3, in this embodiment, a diagonal brace 17 is hinged to the inner side of the base rod 3, and a slider 18 is hinged to the bottom end of the diagonal brace 17. The rear slider 18 is slidably disposed within the inner plate 10 in the front-rear direction, and the front slider 18 is slidably disposed within the base plate 9 in the front-rear direction. A buffer spring 19 is fixedly disposed on the outer side of the slider 18, and a fixing plate 20 is fixedly disposed on the other end of the buffer spring 19. The rear fixing plate 20 is fixedly connected to the inner plate 10, and the front fixing plate 20 is fixedly connected to the base plate 9. The buffer spring 19 is fixedly disposed on the outer side of the inner plate 10. 9 is in a compressed state; during use, the angle between the base rod 3 and the base plate 6 is different for gantry cranes of different heights. When the angle between the base rod 3 and the base plate 6 decreases, the base rod 3 pushes the slider 18 to slide inward through the diagonal brace 17, and the slider 18 further compresses the buffer spring 19; when the angle between the base rod 3 and the base plate 6 increases, the slider 18 slides outward, and the buffer spring 19 extends, but the buffer spring 19 is still in a compressed state; during normal use, the diagonal brace 17 provides support for the base rod 3, making the base rod 3 more stable.

[0039] In this embodiment, both the inner plate 10 and the base plate 9 have slide rails 21 on their upper surfaces. The slider 18 is slidably disposed in the corresponding slide rail 21, and the fixing plate 20 is slidably disposed in the corresponding slide rail 21. An end plate 22 is fixedly disposed at the inner end of the slide rail 21. A top pressure rod 23 is threadedly connected to the end plate 22. The outer end of the top pressure rod 23 is rotatably connected to the corresponding fixing plate 20. During assembly, by rotating the top pressure rod 23, the top pressure rod 23 moves back and forth in the end plate 22, thereby driving the fixing plate 20 to move back and forth in the slide rail 21. This causes the fixing plate 20 to compress or stretch the buffer spring 19, thereby adjusting the preload of the buffer spring 19. When the top pressure rod 23 is not rotated, the fixing plate 20 is relatively fixed in the slide rail 21. The upper surface of the cover plate 16 has a spacer groove 24 that matches the slide rail 21.

[0040] To further prevent the adjusting threaded rod 12 from rotating, in this embodiment, an installation space is formed between the end of the inner plate 10 and the slide groove 15. The rear end of the drive rod 11 is located within the installation space and fixedly disposed with the front end of the adjusting threaded rod 12. Two drive blocks 25 are slidably disposed on the inner bottom wall of the installation space in the left-right direction. Each drive block 25 has a clamping block 27 fixedly disposed on its upper end surface by an L-shaped rod 26. Each clamping block 27 has an arc-shaped surface on its inner side that matches the outer surface of the drive rod 11. A bidirectional threaded rod 28 is disposed in the base plate 9 in the left-right direction. The bidirectional threaded rod 28 is rotatably connected to the base plate 9. Each drive block 25 is fixedly disposed with the L-shaped rod 26 by an L-shaped rod 26. The bidirectional threaded rod 28 is threaded. By rotating the bidirectional threaded rod 28, two drive blocks 25 can be moved simultaneously, either close to or far apart. This causes the two drive blocks 25 to move, via the L-rod 26, clamping blocks 27, either close to or far apart. When the two clamping blocks 27 move close to each other, they clamp the drive rod 11 to prevent it from rotating accidentally. When the drive rod 11 needs to be rotated, the bidirectional threaded rod 28 is rotated to move the two clamping blocks 27 away from each other, and then the drive rod 11 can be rotated. The clamping blocks 27 are equivalent to the holding and releasing brakes of a mechanical brake, and their purpose is to prevent the drive rod 11 from moving outwards.

[0041] In this embodiment, a stop nut 29 is threaded onto the adjusting threaded rod 12 located in the installation space. During normal use, rotating the stop nut 29 causes it to abut against the end plate 22 of the inner plate 10, preventing the adjusting threaded rod 12 from rotating. When it is necessary to rotate the adjusting threaded rod 12, rotate the stop nut 29 away from the inner plate 10, then rotate the locking nut 14 away from the rear bottom plate 6, and then rotate the bidirectional threaded rod 28 to move the two clamping blocks 27 away from each other to release the drive rod 11. Then the adjusting threaded rod 12 can be rotated by the drive rod 11.

[0042] The working principle of this utility model is as follows: During normal use, after the lifting device 5 lifts the material, the drive motor drives the roller to rotate, causing the roller to roll on the track and move the crossbeam 1 back and forth, thus achieving the purpose of lifting the material through the lifting device 5 on the crossbeam 1; the crossbeam 1 is manufactured according to the specifications of the crossbeam 1 determined during on-site surveying, and then the top rod 2, the bottom rod 3, and a set number of support rods 4 are fixed and installed through the flange 8 and fixing bolts, so that the top rod 2 is hinged to the crossbeam 1; after assembly, the ladder and platform are installed between the two legs on the same side; during assembly, the distance between the two base plates 6 on the same side is adjusted by adjusting the threaded rod 12, and then the preload of the buffer spring 19 is adjusted to a suitable range by adjusting the top pressure rod 23.

Claims

1. A variable-lift gantry crane, comprising a crossbeam, characterized in that: Two support legs are provided on both the left and right sides of the lower end face of the crossbeam. The support legs are segmented, including a top rod at the top and a bottom rod at the bottom. Several support rods are provided between the top rod and the bottom rod. The top of the top rod is hinged to the crossbeam. A lifting device is slidably installed on the crossbeam from left to right. A traveling mechanism is hinged to the bottom of each support leg.

2. The variable-lift gantry crane according to claim 1, characterized in that: The walking mechanism includes a base plate hinged to the bottom end of the base rod, and a number of roller assemblies are fixedly installed on the lower end surface of the base plate.

3. The variable-lift gantry crane according to claim 1, characterized in that: The bottom of the base rod, the bottom of the top rod, and both ends of the support rod are all fixedly equipped with flanges. The base rod and the corresponding support rod are fixed together by flanges and fixing bolts. The support rods are fixed together by flanges and fixing bolts. The top rod and the corresponding support rod are fixed together by flanges and fixing bolts.

4. The variable-lift portal crane of claim 1, wherein: A telescopic mechanism is provided between the two base plates on the same side. An adjustment device is provided on the telescopic mechanism to adjust the length of the telescopic mechanism and lock the telescopic mechanism's telescopic function.

5. A variable-lift portal crane according to claim 4, characterized in that: The telescopic mechanism includes a base plate fixedly disposed on the inner side of the front base plate and an inner plate fixedly disposed on the inner side of the rear base plate, the inner plate being slidably disposed within the base plate in the front-rear direction.

6. A variable-lift portal crane according to claim 5, characterized in that: The adjustment device includes a drive rod arranged in the base plate along the front-rear direction. The front end of the drive rod passes through the front bottom plate and is rotatably connected to the bottom plate. An adjustment threaded rod is fixedly provided at the rear end of the drive rod. The adjustment threaded rod passes through the inner plate and the rear bottom plate. The adjustment threaded rod is threadedly connected to the inner plate and the corresponding bottom plate.

7. A variable-lift portal crane according to claim 5, characterized in that: The upper surface of the substrate is provided with a sliding groove, and a cover plate is fixedly provided on the upper surface of the substrate. A sliding hole is formed between the cover plate and the sliding groove, and the inner plate is slidably disposed in the sliding hole in the front-back direction.

8. The variable-lift portal crane of claim 4, wherein: The inner side of the base rod is hinged with a diagonal brace, and the bottom end of the diagonal brace is hinged with a slider. The rear slider is slidably disposed in the inner plate in the front-back direction, and the front slider is slidably disposed in the base plate in the front-back direction. A buffer spring is fixedly disposed on the outer side of the slider, and a fixing plate is fixedly disposed on the other end of the buffer spring. The rear fixing plate is fixedly connected to the inner plate, and the front fixing plate is fixedly connected to the base plate. The buffer spring is in a compressed state.

9. The variable-lift gantry crane according to claim 8, characterized in that: The upper surfaces of the inner plate and the base plate are provided with slide rails. The slider is slidably disposed in the corresponding slide rail, and the fixing plate is slidably disposed in the corresponding slide rail. An end plate is fixedly disposed at the inner end of the slide rail, and a top pressure rod is threadedly connected to the end plate. The outer end of the top pressure rod is rotatably connected to the corresponding fixing plate.

10. The variable-lift gantry crane according to claim 7, characterized in that: An installation space is formed between the end of the inner plate and the slide groove. The rear end of the drive rod is located in the installation space and fixedly set with the front end of the adjusting threaded rod. Two drive blocks are slidably set in the inner bottom wall of the installation space in the left and right direction. Each drive block has a clamping block fixedly set on its upper end surface by an L rod. Each clamping block has an arc-shaped surface on its inner side that matches the outer surface of the drive rod. A bidirectional threaded rod is set in the base plate in the left and right direction. The bidirectional threaded rod is rotatably connected to the base plate. Each drive block is threadedly connected to the bidirectional threaded rod.

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