A portal crane

Abstract

A gantry crane, relating to the field of lifting machinery, addresses the problem of swaying caused by inertia when the lifting device moves with the crane. This application includes a crane beam, two support columns, and an anti-sway lifting device. The support columns support the crane beam. The anti-sway lifting device includes a winch, a sling, a limit cable, two linkage sliders, and the lifting device itself. The winch is mounted to the crane beam. The two linkage sliders are installed on the two support columns. One end of the sling is wound around the winch, and the other end is connected to the lifting device for lifting heavy objects. The middle section of the limit cable is slidably connected to the hook. The left section of the limit cable is connected to the linkage slider on the left support column and then wound onto the winch and tensioned. The right section of the limit cable is connected to the linkage slider on the right support column and then wound onto the winch and tensioned. Both ends of the sling and the limit cable are wound in the same direction as the winch. The angle between the left and right sections of the limit cable and the sling is greater than 90 degrees.

Description

Technical Field

[0001] This application relates to the field of lifting machinery technology, specifically to a lifting device for gantry cranes, and more particularly to an anti-sway lifting device for gantry cranes with efficient anti-sway function. Background Technology

[0002] Gantry cranes, also known as overhead cranes, are an important variation of bridge cranes. Due to their structural characteristics, they are widely used in outdoor freight yards, material yards, and port terminals for loading and unloading bulk and large materials. Their core advantages lie in high site utilization, large operating range, wide adaptability, and strong versatility.

[0003] However, the inventors discovered that during operation, the lifting system of a gantry crane experiences significant swaying due to inertia. This phenomenon leads to two dual problems: first, reduced loading and unloading efficiency, as it becomes difficult to achieve precise and rapid alignment between the lifting equipment and the load, severely impacting the efficiency of loading and unloading operations; second, insufficient lifting stability, as the load continues to sway significantly at low frequencies even after lifting is completed, causing a sharp decline in the stability of the lifting process and potentially inducing safety risks. Summary of the Invention

[0004] In view of this, this application provides a gantry crane that can prevent the swaying of the lifting device to ensure accurate connection between the lifting device and the load and stability of the load movement.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows:

[0006] A gantry crane includes a crane beam and two support columns for supporting the crane beam. It also includes an anti-sway lifting device comprising a winch, a sling, a limit cable, a linkage slider, and a lifting device. The winch is mounted to the crane beam. Two linkage sliders are installed on the two support columns and can slide up and down. One end of the sling is wound around the winch, and the other end is connected to the lifting device for lifting heavy objects. The middle section of the limit cable is slidably connected to the hook. The left side of the limit cable is connected to the linkage slider on the left support column and then wound onto the winch and tensioned. The right side of the limit cable is connected to the linkage slider on the right support column and then wound onto the winch and tensioned. Both ends of the sling and the limit cable are wound in the same direction as the winch. The angle between the left and right sides of the limit cable and the sling is greater than 90 degrees.

[0007] Furthermore, there are two limiting cables arranged side by side.

[0008] Furthermore, the linkage slider is equipped with a fixed pulley, and the limiting steel cable is wound around the fixed pulley and onto the winch.

[0009] Furthermore, it also includes a tensioning mechanism, which is installed on the support column and connected to the linkage slider to keep the limit cable taut.

[0010] Furthermore, the tensioning mechanism includes a tensioning slider, a guide rod, and springs. Two guide rods are provided and fixed to the bottom support of the supporting column. The tensioning slider and the linkage slider are sequentially sleeved on the guide rods. Four springs are provided and sleeved on the guide rods. One end of two springs is connected to the tensioning slider, and the other end is connected to the linkage slider and tensioned. One end of the other two springs is connected to the tensioning slider, and the other end is connected to the bottom support of the supporting column and tensioned.

[0011] Furthermore, the lifting device is a hook.

[0012] Furthermore, it also includes a lateral movement mechanism, which is slidably mounted on the crane beam, and an anti-sway spreader is mounted on the lateral movement mechanism and can move with the lateral movement mechanism.

[0013] Furthermore, a transverse slide groove is provided on the crane beam along its length. The transverse movement mechanism includes a drive motor, a lead screw, and a support base. The support base is installed in the transverse slide groove and can move along the length of the transverse slide groove. The drive motor is installed at one end of the crane beam. One end of the lead screw is driven and connected to the drive motor, and the other end extends to one end of the crane beam and is rotatably installed. The lead screw is threadedly connected to the support base.

[0014] The beneficial effects of this application compared to the prior art are:

[0015] 1. The support platform of this application is subjected to an upward force from the sling, while the left and right sections of the limiting cable exert downward and downward forces on the support platform, respectively. This prevents the lifting device on the support platform from moving forward, backward, left, or right. In other words, the sling and the limiting cable limit the support platform. Under this limitation, the support platform can reduce the amplitude of the swaying of the lifting device and / or the load due to inertia when moving with the crane, speed up the alignment speed between the lifting device and the load, and ensure the stability and safety of the lifting process.

[0016] 2. In this application, the tightening and releasing of the limit cable and the sling are both achieved by a single winch, which enables the synchronous release and tightening of the two, avoiding the complexity of setting up and synchronously controlling multiple motors. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are provided to further illustrate this application.

[0018] Figure 1 This is a structural schematic diagram of a gantry crane according to this application.

[0019] Figure 2 for Figure 1A magnified view of a portion of point A in the middle.

[0020] Figure 3 This is an exploded view of the crane body and the traversing mechanism.

[0021] Figure 4 This is a side view of a gantry crane according to this application.

[0022] Explanation of reference numerals in the attached drawings: 1-Crane beam, 11-Transverse slide rail, 2-Support column, 21-Longitudinal slide rail, 3-Tensioning mechanism, 31-Tensioning slider, 32-Guide rod, 33-Spring, 4-Transverse movement mechanism, 41-Drive motor, 42-Screw, 43-Support base, 5-Anti-sway lifting device, 51-Wind, 52-Lifting sling, 53-Limiting cable, 54-Lifting device, 55-Supporting platform, 56-Lifting ring, 57-Linkage slider, 58-Fixed pulley. Detailed Implementation

[0023] The invention described in this application will be explained in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 A schematic diagram of the structure of a gantry crane according to this embodiment is shown, as follows: Figure 1 As shown, the gantry crane in this embodiment includes a crane beam 1, support columns 2, a tensioning mechanism 3, a lateral movement mechanism 4, and an anti-sway device 5. Two support columns 2 are provided and installed below the crane beam 1 to support it. A longitudinal groove 21 is formed on the support column 2 along the vertical direction, and the tensioning mechanism 3 is installed within the longitudinal groove 21. The lateral movement mechanism 4 is slidably mounted on the crane beam 1, and the anti-sway device 5 is installed on the lateral movement mechanism 4 and can move with it.

[0025] Combination Figure 1 The anti-sway lifting device 5 includes a winch 51, a sling 52, a limiting cable 53, a lifting device 54, a support platform 55, and two linkage sliders 57. The winch 51 is mounted on the traversing mechanism 4 and can move with the traversing mechanism 4. One end of the sling 52 is wound around the winch 51, and the other end is connected to the support platform 55. The lifting device 54 is installed at the bottom of the support platform 55 and is used for lifting heavy objects. The lifting device 54 is preferably a hook. Figure 1Two linkage sliders 57 are respectively installed in the longitudinal grooves 21 of the two support columns 2 and can slide up and down. The tensioning mechanism 3 is connected to the linkage sliders 57 and has a downward pulling tendency on the linkage sliders 57. The height of the support platform 55 is higher than the height of the two linkage sliders 57. The bottom of the support platform 55 is provided with two lifting rings 56 and two limiting steel cables 53. The middle sections of the two limiting steel cables 53 pass through the lifting rings 56 at the bottom of the support platform 55 so that the limiting steel cables 53 can slide relative to the lifting device 54. The left section of the limiting steel cable 53 is connected to the linkage slider 57 on the left support column 2 and then wound onto the winch 51 and tensioned. The right section of the limiting steel cable 53 is connected to the linkage slider 57 on the right support column 2 and then wound onto the winch 51 in the same direction and tensioned. At this time, the angle between the left and right sections of the limiting steel cable 53 and the sling 52 is greater than 90 degrees. That is to say, the part of the limiting steel cable 53 between the two support columns 2 forms an upward bending state.

[0026] Because the supporting platform 55 is subjected to an upward force from the sling 52, and the left and right sections of the limiting cable 53 exert downward and downward forces on the supporting platform 55 respectively, the lifting device 54 on the supporting platform 55 cannot move forward, backward, left, or right. In other words, the sling 52 and the limiting cable 53 limit the supporting platform 55. Under this limitation, the supporting platform 55 can reduce the amplitude of the swaying of the lifting device 54 and / or the load due to inertia when moving with the crane, accelerate the alignment speed between the lifting device 54 and the load, and ensure the stability and safety of the load lifting process. It should be noted that in this embodiment, the use of two limiting cables 53 can reduce the amplitude of the forward and backward swaying of the supporting platform 55 and the lifting device 54.

[0027] Combination Figure 2It can be seen that both ends of the sling 52 and the limiting cable 53 are wound counterclockwise on the drum of the winch 51. When the drum of the winch 51 rotates to the right, the sling 52 and the limiting cable 53 are released, and the length of the limiting cable 53 released is twice the length of the sling 52 released. In this way, when the support platform 55 supports the lifting device 54 and moves down, the distance that the linkage sliders 57 on the left and right sides move down is the same as the distance that the support platform 55 moves down. At the same time, under the force of the tensioning mechanism 3 on the linkage sliders 57, the angle between the left and right sections of the limiting cable 53 and the sling 52 is still greater than 90 degrees. Similarly, when the drum of the winch 51 rotates to the left, the winch 51 winds up the sling 52 and the limiting cable 53. The length of the limiting cable 53 wound up is twice the length of the sling 52 wound up. The distance that the linkage sliders 57 on both sides move downward is the same as the distance that the support platform 55 moves upward. At the same time, under the force of the tensioning mechanism 3 on the linkage sliders 57, the angle between the left and right sections of the limiting cable 53 and the sling 52 is still greater than 90 degrees. That is, regardless of whether the lifting device 54 moves downward or the lifted load moves upward, the lifting device 54 and the load can always be subjected to the upward force of the sling 52 and the downward force exerted on the support platform 55 by the left and right sections of the limiting cable 53, respectively, which can reduce the sway amplitude. Furthermore, it can be seen that the tightening and releasing of the limiting steel cable 53 and the sling 52 in this embodiment are both achieved by a single winch 51, which enables the synchronous release and tightening of the two, avoiding the complexity of setting up and synchronously controlling multiple motors.

[0028] See Figure 4 In this embodiment, each linkage slider 57 is equipped with two fixed pulleys 58, and each fixed pulley 58 corresponds to a limiting steel cable 53. After the middle section of the limiting steel cable 53 passes through the lifting ring 56 at the bottom of the support platform 55, the left and right sections of the limiting steel cable 53 wrap around the corresponding fixed pulleys 58 and then wind onto the winch 51. The design of the fixed pulleys 58 can reduce the friction between the limiting steel cable 53 and the linkage slider 57.

[0029] See Figure 1 and Figure 4In this embodiment, the tensioning mechanism 3 includes a tensioning slider 31, a guide rod 32, and springs 33. Two guide rods 32 are fixed to the bottom support of the supporting column 2. The tensioning slider 31 and the linkage slider 57 are sequentially sleeved on the guide rods 32. Four springs 33 are sleeved on the guide rods 32. Two springs 33 have one end connected to the tensioning slider 31 and the other end connected to the linkage slider 57 and tensioned. The other two springs 33 have one end connected to the tensioning slider 31 and the other end connected to the supporting column 2 and tensioned. In other words, all four springs 33 are in a stretched state, providing a driving force for the linkage slider 57 and the tensioning slider 31 to move downwards. This allows the linkage slider 57 to exert tension on the limiting cable 53, ensuring that the limiting cable 53 remains taut whether the lifting device 54 is moving downwards or upwards.

[0030] See Figure 1 and Figure 3 In this embodiment, the crane beam 1 has a transverse sliding groove 11 along its length. The transverse movement mechanism 4 includes a drive motor 41, a lead screw 42, and a support base 43. Figure 3 As shown, the bottom of the support base 43 has two sliding grooves, and a slider with a threaded hole is formed between the two sliding grooves. The support base 43 is slidably mounted in the transverse sliding groove 11 of the crane beam 1 via this slider. The drive motor 41 is mounted at one end of the crane beam 1, and one end of the lead screw 42 is driven by the drive motor 41, while the other end extends to the other end of the beam and is rotatably mounted there. The lead screw 42 and the slider of the support base 43 are threadedly connected.

[0031] When the drive motor 41 drives the lead screw 42 to rotate, under the limiting action of the transverse slide 11, the slider is driven by the lead screw 42 to move along the slide, thereby driving the support base 43 to move along the length direction of the crane beam 1. The support base 43 drives the support platform 55 on it to move. The support platform 55 overcomes the force of the limiting steel cable 53 and moves along the limiting steel cable 53, ultimately realizing the lateral translation of the heavy object.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions created in this application, and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions created in this application without departing from the substance and scope of the technical solutions created in this application.

Claims

1. A portal crane comprising a crane beam and support columns, two of which are provided for supporting the crane beam; characterized in that, It also includes an anti-sway lifting device, which consists of a winch, slings, limit cables, linkage sliders, and lifting gear. The winch is assembled to the crane beam. There are two linkage sliders, which are installed on two support columns and can slide up and down. One end of the sling is wound around the winch, and the other end is connected to the lifting gear for lifting heavy objects. The middle section of the limit cable is slidably connected to the hook. The left side of the limit cable is connected to the linkage slider on the left support column and then wound around the winch and tensioned. The right side of the limit cable is connected to the linkage slider on the right support column and then wound around the winch and tensioned. The two ends of the slings and limit cables are wound in the same direction as the winch. The angle between the left and right sides of the limit cable and the slings is greater than 90 degrees.

2. A portal crane according to claim 1, characterised in that The limiting steel cable has two wires arranged side by side.

3. A portal crane according to claim 1, characterized in that The linkage slider is equipped with a fixed pulley, and the limiting steel cable is wound around the winch after passing over the fixed pulley.

4. A portal crane according to claim 1, characterised in that It also includes a tensioning mechanism, which is installed on the support column and connected to the linkage slider to keep the limit cable taut.

5. A portal crane according to claim 4, characterised in that The tensioning mechanism includes a tensioning slider, a guide rod, and springs. There are two guide rods, which are fixed to the bottom support of the supporting column. The tensioning slider and the linkage slider are sequentially sleeved on the guide rods. There are four springs, which are sleeved on the guide rods. One end of two springs is connected to the tensioning slider, and the other end is connected to the linkage slider and tensioned. One end of the other two springs is connected to the tensioning slider, and the other end is connected to the bottom support of the supporting column and tensioned.

6. A portal crane according to claim 1, characterized in that The lifting device is a hook.

7. A portal crane according to claim 1, characterized in that It also includes a lateral movement mechanism, which is slidably mounted on the crane beam, and an anti-sway spreader is mounted on the lateral movement mechanism and can move with the lateral movement mechanism.

8. A portal crane according to claim 7, characterised in that A transverse slide groove is opened on the crane beam along its length. The transverse movement mechanism includes a drive motor, a lead screw, and a support base. The support base is installed in the transverse slide groove and can move along the length of the transverse slide groove. The drive motor is installed at one end of the crane beam. One end of the lead screw is driven and connected to the drive motor, and the other end extends to one end of the crane beam and is rotatably installed. The lead screw is threadedly connected to the support base.

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