Anti-sway device for crane hoisting equipment

Abstract

The present invention relates to a crane sling anti-sway device in the field of crane technology, comprising a crane trolley, a sling with a movable pulley, a wire rope and a control system, wherein the crane trolley is equipped with a drum assembly for reeling in and out the wire rope, one end of the wire rope is wound around and fixedly connected to the drum assembly, and the other end is passed around the movable pulley and is correspondingly connected to the crane trolley, and also includes: a swing rod, a pin shaft is fixedly connected to the middle part of the swing rod, and the two ends of the swing rod are respectively in contact with two vertical sections of the wire rope, so that the wire rope deflection drives the pin shaft to rotate; when the sling sways, the present invention reels in and out the wire rope through the drum assembly, so that the wire rope applies a force on the sling in the opposite direction to the swing direction of the sling, thereby reducing the swing amplitude of the sling, thereby realizing the function of preventing the sling from swaying, and compared with the method of preventing the sling from swaying by setting an upper and lower telescopic structure, the workshop space will not be wasted.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to an anti-sway device for crane hoisting gear. Background Art

[0002] When the crane is accelerating or decelerating, the spreader (especially when it is carrying cargo) will lag behind due to inertia, causing the spreader to sway. The swing amplitude is proportional to the crane's acceleration. That is, when the crane suddenly brakes in an emergency, the spreader will swing greatly, which poses a great safety hazard.

[0003] The existing anti-sway structures of crane slings can be divided into the following types: 1. The sling is connected to the crane trolley or car through an up and down telescopic structure to prevent the sling from swaying without affecting the lifting of the sling; for example, a crane with an anti-sway hoisting device disclosed in Chinese patent publication number CN208087067U, a surface-treated crane sling anti-sway device disclosed in Chinese patent publication number CN203754276U, and an anti-sway gantry crane disclosed in Chinese patent publication number CN219636767U; although this anti-sway structure can The sling can be extended and retracted, but it still has a certain length after extension and retraction. The existence of this length affects the lifting height of the sling, so that the sling is still far away from the top of the workshop when it is at the highest height, wasting a lot of workshop space; the Chinese patent with publication number CN208087067U discloses a bridge crane with anti-sway function. The deformation of the upper and lower telescopic structures above, although it still has a certain length after extension and retraction, but this length is close to the trolley legs. Although it does not affect the lifting height of the sling, the crossbeam will affect the low-altitude space in other positions of the workshop, and there is still a problem of wasting a lot of workshop space. Second, the travel speed and acceleration of the crane are controlled by detecting the moving speed and acceleration of the sling, and the travel speed of the crane is controlled by the posture of the sling. For example, the crane and the anti-sway method of the crane disclosed in the Chinese patent with publication number CN208087067U, although this anti-sway method can play a good anti-sway function in normal conditions of the crane, this anti-sway method cannot adapt to the situation of sudden braking of the crane in an emergency (the crane cannot continue to move).

[0004] For this purpose, we designed an anti-sway device for crane spreaders. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a crane hoisting device anti-swaying device.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0007] A crane sling anti-sway device comprises a crane trolley, a sling with a movable pulley, a wire rope and a control system, wherein the crane trolley is equipped with a drum assembly for retracting and unreeling the wire rope, one end of the wire rope is wound around and fixed to the drum assembly, and the other end is passed around the movable pulley and correspondingly connected to the crane trolley, and further comprises:

[0008] The swing rod has a pin fixed in the middle and is hinged to the crane trolley through the pin. The two ends of the swing rod are respectively against the two vertical sections of the wire rope, so that the deflection of the wire rope drives the pin to rotate;

[0009] The detection mechanism is used to detect the rotation angle of the pin shaft so that the control system can control the reel assembly to retract and unwind the wire rope according to the rotation angle of the pin shaft.

[0010] Preferably, the detection mechanism comprises:

[0011] The fixed cylinder is coaxially arranged at one side of the pin shaft at intervals;

[0012] A piston rod, one end of which is provided with a piston plate that matches the inner cavity of the fixed cylinder, and the other end of which extends out of the fixed cylinder and is axially slidably sleeved on the end of the pin shaft;

[0013] A matching sleeve is coaxially arranged on one end of the fixing cylinder corresponding to the pin shaft, the matching sleeve is coaxially sleeved on the piston rod body, and a spiral matching structure is provided between the inner wall of the matching sleeve and the piston rod body to facilitate axial movement of the piston rod during rotation;

[0014] The detector is arranged in the inner cavity of the fixed cylinder and is connected to the control system signal for detecting the axial displacement of the piston plate.

[0015] Preferably, the detector comprises two pressure detection devices, and the pressure detection devices are respectively located on both sides of the piston plate.

[0016] Preferably, the pressure detection device is slidably connected to the inner cavity of the fixed cylinder, and a return spring is provided between the pressure detection device and the corresponding end of the fixed cylinder.

[0017] Preferably, there is a gap between the pressure detection device and the piston plate.

[0018] Preferably, both ends of the swing rod are provided with a contact wheel for contacting the corresponding vertical section of the wire rope.

[0019] Preferably, each end of the swing rod has two contact wheels for contacting and clamping the vertical section of the wire rope.

[0020] Preferably, the crane trolley is provided with two sets of spaced-apart parallel drum assemblies.

[0021] Preferably, two ends of the steel wire rope are respectively wound around and fixed to two groups of drum assemblies.

[0022] Preferably, two detection mechanisms are provided, corresponding to the two groups of reel assemblies respectively.

[0023] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0024] 1. When the spreader swings, the wire rope is reeled in and out by the drum assembly, so that the wire rope exerts a force on the spreader in the opposite direction of the swing of the spreader, thereby reducing the swing amplitude of the spreader, thereby preventing the spreader from swinging. Compared with the method of preventing the spreader from swinging by setting an upper and lower telescopic structure, it does not waste workshop space;

[0025] 2. The setting of the detection mechanism can make the rotation of the pin drive the axial movement of the piston rod through the cooperation between the piston rod and the matching sleeve, which can effectively amplify the detection amount and make the detection result more accurate;

[0026] 3. Due to the effect of the return spring, the pressure detection device can squeeze the return spring and move after being pressurized. At this time, the pressure value signal detected by the pressure detection device is consistent with the elastic force of the return spring, so it can prevent the pressure value detected by the pressure detection device from changing suddenly, so that the control system can control the operation of the reel assembly more stably, and improve the stability of the anti-sway device;

[0027] 4. There is a gap between the pressure detection device and the piston plate. When the crane is operating normally, the piston plate deviation caused by the slight swing of the lifting device will not contact the pressure detection device, and will not trigger the control system to control the movement of the drum assembly. This can effectively prevent the anti-sway device from being too sensitive and being triggered frequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 for Figure 1 A top view of

[0030] Figure 3 It is a schematic diagram of the assembly of the swing rod and the detection mechanism in the present invention;

[0031] Figure 4 for Figure 3 A cross-sectional view of

[0032] Figure 5 It is a schematic diagram of the assembly of the steel wire rope, the drum assembly, and the detection mechanism in the present invention;

[0033] Figure 6It is a schematic diagram of another way of assembling the steel wire rope, the drum assembly, the swing rod and the detection mechanism in the present invention;

[0034] Figure 7 A schematic diagram of another structure of the present invention;

[0035] Figure 8 The figure is a schematic diagram of the assembly of a steel wire rope, a drum assembly, and a detection mechanism in another structure of the present invention.

[0036] In the figure: 1. crane trolley; 2. lifting device; 21. movable pulley; 3. wire rope; 4. drum assembly; 5. swing rod; 51. resistance wheel; 6. pin shaft; 7. detection mechanism; 71. fixed cylinder; 72. piston rod; 721. piston plate; 73. matching sleeve; 74. detector; 741. pressure detection device; 75. reset spring. DETAILED DESCRIPTION

[0037] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application and are for the convenience of describing the present invention; it should be understood that if there are terms such as "end", "side", "end portion", "lateral", "lateral", "transverse", "longitudinal", etc. indicating directions or positional relationships, they only correspond to the length and width of the corresponding components, that is, the "end portion" indicates the head and tail areas in the length direction of the corresponding component, and the "side portion" indicates the head and tail areas in the width direction of the corresponding component; this is for the convenience of describing the present invention and is not to indicate or imply that the device or element referred to must have a specific direction.

[0038] Embodiment 1, in combination with the attached Figure 1-2 A crane sling anti-sway device comprises a crane trolley 1, a sling 2 with a movable pulley 21, a wire rope 3 and a control system. The crane trolley 1 is equipped with a drum assembly 4 for retracting and unreeling the wire rope 3. One end of the wire rope 3 is wound around and fixed to the drum assembly 4, and the other end is passed around the movable pulley 21 and connected to the crane trolley 1. The device also includes:

[0039] The swing lever 5 is fixed with a pin shaft 6 in the middle, and is correspondingly hinged to the crane trolley 1 through the pin shaft 6. The two ends of the swing lever 5 respectively contact the two vertical sections of the wire rope 3. According to needs, both ends of the swing lever 5 are provided with contact wheels 51 that contact the corresponding vertical sections of the wire rope 3; that is, the wire rope 3 can be deflected when the sling is swung, and the deflection of the wire rope 3 drives the swing lever 5 and the pin shaft 6 to rotate;

[0040] Furthermore, each end of the swing rod 5 has two contact wheels 51 for contacting and clamping the vertical section of the steel wire rope 3 .

[0041] The detection mechanism 7 is used to detect the rotation angle of the pin shaft 6, so that the control system can control the reel assembly 4 to retract and unwind the wire rope 3 according to the rotation angle of the pin shaft 6;

[0042] In a possible implementation, the detection mechanism 7 may be an encoder; that is, the rotation angle of the pin shaft 6 is detected by the encoder.

[0043] For ease of understanding, here we take the example of two vertical sections of the wire rope 3 being arranged at intervals along the direction of travel of the crane trolley 1 and the crane trolley 1 being stopped by emergency braking. Figure 5-6 Under the action of inertia, the sling 2 first deviates to the left and drives the vertical section of the wire rope 3 to deviate to the left, thereby driving the swing rod 5 to rotate clockwise. The detection mechanism 7 detects that the swing rod 5 rotates clockwise and transmits the detected signal to the control system. Figure 5 , the control system controls the drum assembly 4 to reel in the wire rope 3, and the wire rope 3 pulls the pulley 21 to the right, so that the sling 2 accelerates to the right, thereby reducing the swing amplitude of the sling 2 to the left. When the sling 2 swings to the left to the limit value, the gravitational potential energy of the sling 2 is converted into kinetic energy for moving to the right. According to the above principle, the sling 2 begins to drive the vertical section of the wire rope 3 to deflect to the right. At this time, the swing rod 5 rotates counterclockwise, and the control system controls the drum assembly 4 to unwind the wire rope 3. At this time, the wire rope 3 pulls the pulley 21 to the left to reduce the swing amplitude of the sling 2 to the right. That is, when the sling 2 swings, the drum assembly 4 can reel in and unwind the wire rope 3, so that the wire rope 3 applies a force to the sling 2 in the opposite direction to the swing direction of the sling 2, thereby reducing the swing amplitude of the sling 2, thereby realizing the function of preventing the sling 2 from swinging. Compared with the method of preventing the sling 2 from swinging by setting an upper and lower telescopic structure, it does not waste workshop space. Combined with the attached Figure 6 , the control system controls the reel assembly 4 to unwind the wire rope 3, and the wire rope 3 pulls the pulley 21 to the right, so that the sling 2 accelerates to the right, thereby reducing the swing amplitude of the sling 2 to the left. When the sling 2 swings to the left to the limit value, the gravity potential energy of the sling 2 is converted into kinetic energy for moving to the right. According to the above principle, the sling 2 begins to drive the vertical section of the wire rope 3 to deflect to the right. At this time, the swing rod 5 rotates counterclockwise, and the control system controls the reel assembly 4 to rewind the wire rope 3. At this time, the wire rope 3 pulls the pulley 21 to the left to reduce the swing amplitude of the sling 2 to the right. That is, when the sling 2 swings, the wire rope 3 can be retracted and unwound by the reel assembly 4, so that the wire rope 3 applies a force to the sling 2 in the opposite direction to the swing direction of the sling 2, thereby reducing the swing amplitude of the sling 2, thereby realizing the function of preventing the sling 2 from swinging. Compared with the method of preventing the sling 2 from swinging by setting an upper and lower telescopic structure, it does not waste workshop space.

[0044] Embodiment 2, combined with the attached Figure 3-4, a crane hoist anti-sway device, in the technology of the first embodiment, the difference between the detection mechanism 7 and the first embodiment is that the detection mechanism 7 includes:

[0045] The fixing cylinder 71 is coaxially arranged at one side of the pin shaft 6 at intervals; specifically, the fixing cylinder 71 is fixedly connected to the crane trolley 1;

[0046] The piston rod 72 has a piston plate 721 at one end that cooperates with the inner cavity of the fixed cylinder 71 , and the other end extends out of the fixed cylinder 71 and is axially slidably sleeved on the end of the pin shaft 6 .

[0047] It should be noted that the piston rod 72 can move axially relative to the pin shaft 6, but will not rotate relative to it. As required, the shaft body at the end of the pin shaft 6 can be provided with a slide groove along its axial direction, or the end of the pin shaft 6 can be provided with a non-circular structure such as a prism or a square, so as to ensure that the rotation of the pin shaft 6 can drive the piston rod 72 to rotate.

[0048] The matching sleeve 73 is coaxially arranged on one end of the fixed cylinder 71 corresponding to the pin shaft 6. The matching sleeve 73 is coaxially sleeved on the rod body of the piston rod 72, and a spiral matching structure is provided between the inner wall of the matching sleeve 73 and the rod body of the piston rod 72 to facilitate the axial movement of the piston rod 72 during rotation.

[0049] It should be noted that the spiral matching structure includes a spiral groove provided on the inner wall of the matching sleeve 73 and a spiral protrusion provided on the rod body of the piston rod 72, and the spiral protrusion is slidably matched with the spiral groove along the direction of the spiral groove. As required, the spiral groove can also be provided on the rod body of the piston rod 72, and the spiral protrusion is provided on the inner wall of the matching sleeve 73. For ease of understanding, the matching sleeve 73 and the piston rod 72 can be regarded as a thread matching with a larger pitch.

[0050] The detector 74 is disposed in the inner cavity of the fixed cylinder 71 and is connected to the control system signal for detecting the axial displacement of the piston plate 721 .

[0051] If necessary, the detector 74 may be a displacement sensor.

[0052] Since the rotation angle of the pin shaft 6 generally does not exceed ±15 degrees and the rotation angle is relatively small, the setting of the detection mechanism 7 can enable the rotation of the pin shaft 6 to drive the axial movement of the piston rod 72 through the cooperation of the piston rod 72 and the matching sleeve 73, which can effectively amplify the detection amount and make the detection result more accurate.

[0053] Embodiment 3, in combination with the attached Figure 3-4, a crane hoist anti-sway device, in terms of the technology of the second embodiment, the difference between the detector 74 and the second embodiment is that: the detector 74 includes two pressure detection devices 741, and the pressure detection devices 741 are respectively located on both sides of the piston plate 721; that is, the piston plate 721 moves and squeezes the pressure detection device 741, and the control system controls the operating speed of the drum assembly 4 according to the signal detected by the pressure detection device 741 of the control system, thereby realizing the function of controlling the operating speed of the drum assembly 4 according to the swing amplitude of the hoist 2. Specifically, the pressure detection device 741 is connected to the control system signal.

[0054] As needed, in order to prevent the pressure detection device 741 from being damaged due to excessive pressure, the pressure detection device 741 is slidably connected to the inner cavity of the fixed cylinder 71, and a reset spring 75 is provided between the pressure detection device 741 and the corresponding end of the fixed cylinder 71; this arrangement enables the pressure detection device 741 to move according to the pressure conditions through the action of the reset spring 75.

[0055] With such arrangement, due to the action of the reset spring 75, the pressure detecting device 741 can squeeze the reset spring 75 and move after being compressed. At this time, the pressure value signal detected by the pressure detecting device 741 is consistent with the elastic force of the reset spring 75. Therefore, it is possible to prevent the pressure value detected by the pressure detecting device 741 from suddenly changing, thereby enabling the control system to more stably control the operation of the reel assembly 4, thereby improving the stability of the operation of the anti-sway device.

[0056] Furthermore, there is a gap between the pressure detection device 741 and the piston plate 721. When the crane is operating normally, the deviation of the piston plate 721 caused by a slight swing of the sling 2 will not contact the pressure detection device 741, and will not trigger the control system to control the movement of the drum assembly 4. This can effectively prevent the anti-sway device from being too sensitive and being triggered frequently.

[0057] Embodiment 4, in combination with the attached Figure 7-8 , a crane hoist anti-sway device, based on the first embodiment, the crane trolley 1 is provided with two sets of parallel drum assemblies 4 spaced apart.

[0058] Furthermore, two ends of the steel wire rope 3 are respectively wound around and fixed to two groups of drum assemblies 4 .

[0059] Furthermore, two detection mechanisms 7 are provided, corresponding to the two groups of reel assemblies 4 one by one.

[0060] For ease of understanding, here we take the example of two vertical sections of the wire rope 3 being arranged at intervals along the direction of travel of the crane trolley 1 and the crane trolley 1 being stopped by emergency braking. Figure 8Under the action of inertia, the sling 2 first deviates to the left and drives the vertical section of the wire rope 3 to deviate to the left, thereby driving the swing rod 5 to rotate clockwise. The detection mechanism 7 detects that the swing rod 5 rotates clockwise and transmits the detected signal to the control system. Figure 8 , the control system controls the drum assembly 4 on the left to unwind the wire rope 3, and the drum assembly 4 on the right to rewind the wire rope 3. The wire rope 3 pulls the pulley 21 to the right, so that the sling 2 accelerates to the right, thereby reducing the swing amplitude of the sling 2 to the left. When the sling 2 swings to the left to the limit value, the gravity potential energy of the sling 2 is converted into kinetic energy for moving to the right. According to the above principle, the sling 2 begins to drive the vertical section of the wire rope 3 to deflect to the right. At this time, the swing rod 5 rotates counterclockwise, and the control system controls the drum assembly 4 on the left to rewind the wire rope 3, and the drum assembly 4 on the right to unwind the wire rope 3. At this time, the wire rope 3 pulls the pulley 21 to the left to reduce the swing amplitude of the sling 2 to the right. That is, when the sling 2 swings, the wire rope 3 can be rewound and unwound by the drum assembly 4, so that the wire rope 3 exerts a force on the sling 2 in the opposite direction to the swing direction of the sling 2, thereby reducing the swing amplitude of the sling 2, thereby realizing the function of preventing the sling 2 from swinging.

[0061] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A crane sling anti-sway device, comprising a crane trolley (1), a sling (2) having a movable pulley (21), a steel wire rope (3) and a control system, wherein the crane trolley (1) is equipped with a drum assembly (4) for reeling in and unreeling the steel wire rope (3), one end of the steel wire rope (3) is wound around and fixedly connected to the drum assembly (4), and the other end of the steel wire rope is passed around the movable pulley (21) and is correspondingly connected to the crane trolley (1), characterized in that: Also includes: A swing rod (5) is fixedly connected to a pin shaft (6) in the middle thereof and is correspondingly hinged to the crane trolley (1) via the pin shaft (6). Each end of the swing rod (5) has two contact wheels (51) for contacting and clamping the corresponding vertical section of the steel wire rope (3), so that the steel wire rope (3) deflects and drives the pin shaft (6) to rotate; A detection mechanism (7) is used to detect the rotation angle of the pin shaft (6), so that the control system can control the reel assembly (4) to retract and unwind the steel wire rope (3) according to the rotation angle of the pin shaft (6); Wherein, the detection mechanism (7) comprises: A fixed cylinder (71) is coaxially arranged at one side of the pin shaft (6) at intervals; A piston rod (72) having a piston plate (721) at one end thereof that cooperates with the inner cavity of the fixed cylinder (71), and having the other end extending out of the fixed cylinder (71) and axially slidably sleeved on the end of the pin shaft (6); A matching sleeve (73) is coaxially arranged on one end of the fixed cylinder (71) corresponding to the pin shaft (6), the matching sleeve (73) is coaxially sleeved on the rod body of the piston rod (72), and a spiral matching structure is provided between the inner wall of the matching sleeve (73) and the rod body of the piston rod (72) to facilitate axial movement of the piston rod (72) during rotation; The detector (74) is disposed in the inner cavity of the fixed cylinder (71) and is connected to the control system signal, and is used to detect the axial displacement of the piston plate (721).

2. The anti-sway device for crane hoisting equipment according to claim 1, characterized in that: The detector (74) comprises two pressure detection devices (741), and the pressure detection devices (741) are respectively located on two sides of the piston plate (721).

3. The anti-sway device for crane hoisting equipment according to claim 2, characterized in that: The pressure detection device (741) is slidably connected to the inner cavity of the fixed cylinder (71), and a return spring (75) is provided between the pressure detection device (741) and the corresponding end of the fixed cylinder (71).

4. The anti-sway device for crane spreader according to claim 2, characterized in that: There is a gap between the pressure detection device (741) and the piston plate (721).

5. The anti-sway device for crane spreader according to claim 1, characterized in that: The crane trolley (1) is provided with two sets of spaced-apart parallel reel assemblies (4).

6. The anti-sway device for crane hoisting equipment according to claim 5, characterized in that: The two ends of the steel wire rope (3) are respectively wound around and fixedly connected to two groups of winding drum assemblies (4).

7. The anti-sway device for crane spreader according to claim 6, characterized in that: The detection mechanisms (7) are provided with two, corresponding one to one to the two groups of reel assemblies (4) respectively.

Images