Method for carrying out anti-inclination protection on gantry crane

Abstract

The invention provides a method for carrying out anti-inclination protection on a gantry crane. The gantry crane comprises two rails, a cross beam, a winch and a lifting hook connected with a rotating disc of a lifting machine through a sling. A telescopic sleeve of a rigid structure is arranged to sleeve an inhaul cable to prevent the inhaul cable from swinging so as to achieve toppling of the gantry crane supporting frame, the upper end of the telescopic sleeve and the cross beam are fixed together, a lifting hook is located at the lower end of the telescopic sleeve, and the telescopic sleeve comprises a plurality of sections which can be sequentially arranged in a pluggable and sleeved mode. When the lifting hook ascends, the lower end of the sleeve is jacked by the supporting frame, so that the telescopic sleeve is shortened, and the lifting of the lifting hook is prevented from being interfered; an object is hung on the lifting hook to be lifted, and swinging of the sling is limited through the telescopic sleeve in the lifting process, so that the situation that the supporting frame topples due to the fact that the swinging amplitude of the object exceeds a set value is avoided. The gantry sling has the advantage that the swing amplitude of the sling can be limited in the hoisting process at present, and the problem that an existing gantry sling swings too much to cause inclination is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting equipment, and in particular to a method for preventing a gantry crane from tilting. Background Art

[0002] Gantry cranes are used to lift objects in the production site of concrete precast parts for bridges and roads. The gantry crane includes two tracks, a crossbeam supported on the track by a support frame at each end, a winch installed on the crossbeam, and a hook connected to the turntable of the winch through a sling. The support frame includes a bottom longitudinal beam and an oblique vertical beam whose lower end is connected to both ends of the bottom longitudinal beam, the upper end of the oblique vertical beam is connected to the crossbeam, and the two ends of the bottom longitudinal beam are supported on the track through walking wheels. When the existing gantry crane drops an object, if the swing amplitude of the sling is too large due to wind force or other reasons, the object will pull the support frame to tilt and fall. Summary of the invention

[0003] The present invention aims to provide a method for preventing a gantry crane from tilting by limiting the swing amplitude of a sling during the hoisting process, thereby solving the problem that the existing gantry sling may tilt due to excessive swing.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technology: a method for preventing a gantry crane from tilting, the gantry crane comprises two tracks, a crossbeam supported on the track by a supporting tripod at each end, a winch arranged on the crossbeam and a hook connected to the turntable of the winch through a sling, the support frame comprises a bottom longitudinal beam and an oblique vertical beam connected at the lower end to the two ends of the bottom longitudinal beam, the upper end of the oblique vertical beam is connected to the crossbeam, and the two ends of the bottom longitudinal beam are supported on the track by walking wheels, characterized in that the gantry crane support frame is tilted by arranging a telescopic sleeve of a rigid structure to be sleeved on the cable to prevent the cable from swinging, and the telescopic sleeve is provided to prevent the cable from swinging. The upper end of the sleeve is fixed together with the crossbeam, the telescopic sleeve is sleeved on the cable, the hook is located at the lower end of the telescopic sleeve, and the telescopic sleeve includes a plurality of segments that can be inserted and unplugged in sequence; between adjacent segments, the segment located below is hooked on the lower end of the segment located above to avoid disengagement; a supporting frame is provided on the hook, and when the hook rises, the supporting frame pushes the lower end of the sleeve to shorten the telescopic sleeve to avoid interfering with the rise of the hook; the object is hung on the hook and lifted, and the swing of the sling is limited by the telescopic sleeve during the lifting process, thereby preventing the swing amplitude of the object from exceeding the setting and causing the support frame to tip over.

[0005] Preferably, an anti-dumping structure is provided at each end of the support frame along the extension direction of the track, and the anti-dumping structure includes two cross-arranged friction rods hinged at the end of the bottom longitudinal beam through a hinge shaft, a cylinder driving the two friction rods to open and close, and a detection structure for detecting whether the running wheel is lifted off the track. Two upper friction strips extending along the extension direction of the track are provided on both sides of the track, and the lower ends of the two friction rods are located on both sides of the track. The friction rods are provided with upper friction parts that cooperate with the upper friction strips; when the detection structure of the anti-dumping structure detects that the running wheel is lifted off the track, the cylinder of the anti-dumping structure located at the end of the bottom longitudinal beam where the running wheel is lifted off the track drives the two friction rods to close so that the upper friction part is pressed against the upper friction strip. When tilting occurs, the friction force on the one hand offsets the force that causes the tilting by lifting, and on the other hand, the friction wheel blocks the running of the running wheel, thereby extending the speed of dumping and providing response time for taking anti-dumping measures.

[0006] Preferably, the detection structure includes a support column head with a sliding hole connected to the bottom longitudinal beam, a pressing ball inserted in the sliding hole and extending out of the lower end surface of the support column head, a lower electric column inserted in the lower end of the sliding hole, an upper conductive column fixed in the upper end of the sliding hole, and a spring driving the lower electric column to separate from the upper electric column. The lower electric column and the upper conductive column are connected to a controller of the oil cylinder through a wire. The pressing ball is aligned with the track. When the running wheel is supported on the track, the pressing ball at the end where the running wheel is located presses on the track so that the lower electric column and the upper conductive column are abutted together. When the running wheel is lifted off the track, the lower electric column and the upper conductive column at the end where the running wheel is lifted off the track are separated under the action of the spring. When the lower electric column and the upper conductive column are separated, it means that the running wheel is lifted off the track. At this time, the controller controls the oil cylinder to drive the two friction rods to close so that the upper friction part abuts against the upper friction strip. A specific technical solution for the detection structure is provided.

[0007] Preferably, the lower end of the guide rail is provided with a small diameter section, and two inverted steps located on both sides of the small diameter section are formed between the guide rail and the small diameter section. The lower ends of the two friction rods are provided with hooks for hooking on the two steps in a one-to-one correspondence. When the upper friction part abuts against the upper friction strip, the hook is located directly below the step. When tipping occurs, the hook hooks the step to prevent the support frame from tipping. The reliability of preventing the gantry crane from tipping is good.

[0008] Preferably, two lower friction strips extending along the extension direction of the track are provided on both sides of the small diameter section, and the end of the hook head is provided with a lower friction part cooperating with the lower friction strip, and when the upper friction part is pressed against the upper friction strip, the lower friction part is pressed against the lower friction strip, which can increase the friction force and improve the anti-dumping effect.

[0009] Preferably, an insulating guide column is fixed on the upper end surface of the lower conductive column, a guide hole is provided on the lower end surface of the upper conductive column, a pit is provided on the upper end surface of the insulating guide column, and the insulating guide column is always inserted in the guide hole during the whole process of the lower electric column and the upper conductive column being separated and combined, one end of the spring is located in the pit, and the other end is located in the guide hole. The lower electric column and the upper conductive column can be reliably closed together and disconnected in an insulated manner, and the spring can be reliably installed without displacement or falling off.

[0010] Preferably, the guide rail is provided with a support portion for supporting the running wheel, and the upper friction strips are located on both sides of the support portion. The upper friction strips are separated from the support portion, which can avoid the support portion being rough due to friction, which is not conducive to the running of the running wheel.

[0011] Preferably, a supporting annular groove extending in the circumferential direction of the traveling wheel is provided on the circumferential surface of the traveling wheel, the generatrix of the supporting annular groove is an arc line, and the supporting portion is supported in the supporting annular groove in a line contact manner.

[0012] Preferably, the lower end of the segment is provided with an outer turn-up edge, and the upper end is provided with an inner turn-up edge; adjacent segments are suspended together by the inner turn-up edges being suspended on the outer turn-up edges.

[0013] Preferably, the connection point between the hook and the support frame, the lowest point of the hook and the portion of the sling located in the telescopic sleeve are located in a straight line, which can reduce the torsion force on the connection point between the suspension rod and the support frame when hoisting objects.

[0014] Beneficial effects: the swinging amplitude of the sling can be limited, thereby preventing the sling swing from causing the center of gravity of the object to deviate from the plane determined by the gantry and causing the gantry to tip over; when tipping occurs, it can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a side view schematic diagram of the gantry; Figure 2 for Figure 1 A local enlarged schematic diagram of point A; Figure 3 Schematic diagram of the anti-topple structure.

[0016] In the figure: track 1, cross beam 2, winch 3, sling 4, hook 5, bottom longitudinal beam 6, oblique vertical beam 7, walking wheel 8, telescopic sleeve 9, segment 10, support frame 11, connection point of hook and support frame 12, lowest point of hook 13, anti-dumping structure 14, hinge shaft 15, friction rod 16, cylinder 17, detection structure 36, upper friction strip 18, upper friction part 19, support column head 20, pressing ball 21, lower electric column 22, upper conductive column 23, spring 24, insulating guide column 25, guide hole 26, pit 27, small diameter section 28, step 29, hook head 30, lower friction strip 37, lower friction part 32, support part 31, support ring groove 33, outer flange 34, inner flange 35. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figures 1 to 3 A method for preventing a gantry crane from tilting is disclosed. The gantry crane comprises two tracks 1, a crossbeam 2 supported on the tracks by a support frame at each end, a winch 3 arranged on the crossbeam, and a hook 5 connected to a turntable of the winch by a sling 4. The support frame comprises a bottom longitudinal beam 6 and an oblique vertical beam 7 whose lower end is connected to both ends of the bottom longitudinal beam, and whose upper end is connected to the crossbeam. Both ends of the bottom longitudinal beam are supported on the track by running wheels 8. The tilting of the gantry crane support frame is achieved by arranging a telescopic sleeve 9 of a rigid structure on the cable to prevent the cable from swinging. The upper end of the telescopic sleeve is fixed to the crossbeam, the telescopic sleeve is sleeved on the cable, the hook is located at the lower end of the telescopic sleeve, and the telescopic sleeve includes a plurality of segments 10 that can be inserted and removed in sequence; between adjacent segments, the lower segment is hooked on the lower end of the upper segment to avoid disengagement; a support frame 11 is provided on the hook, and when the hook rises, the lower end of the sleeve on the support frame is pressed to shorten the telescopic sleeve to avoid interfering with the rise of the hook. The connection point 12 of the hook and the support frame, the lowest point 13 of the hook and the part of the cable located in the telescopic sleeve are located in a straight line.

[0019] When in use, the object is hung on the hook and lifted. During the lifting process, the swing of the sling is limited by the telescopic sleeve, thereby preventing the swing amplitude of the object from exceeding the setting and causing the support frame to tip over.

[0020] An anti-dumping structure 14 is provided at each end of the support frame along the extension direction of the track. The anti-dumping structure includes two cross-arranged friction rods 16 hinged at the end of the bottom longitudinal beam through a hinge shaft 15, a cylinder 17 driving the two friction rods to open and close, and a detection structure 36 for detecting whether the running wheel is lifted off the track. The hinge shafts at both ends of the cylinder are at the upper ends of the two friction rods. Two upper friction strips 18 extending along the extension direction of the track are provided on both sides of the track. The lower ends of the two friction rods are located on both sides of the track. The friction rods are provided with upper friction parts 19 cooperating with the upper friction strips; when the detection structure of the anti-dumping structure detects that the running wheel is lifted off the track, the cylinder of the anti-dumping structure located at the end of the bottom longitudinal beam where the running wheel is lifted off the track drives the two friction rods to close so that the upper friction part is pressed against the upper friction strip. When tilting occurs, the friction force offsets the force that causes the tilting by lifting up on the one hand, and the friction wheel blocks the running of the running wheel on the other hand, thereby prolonging the speed of dumping and providing response time for taking anti-dumping measures.

[0021] The detection structure includes a support column head 20 with a sliding hole connected to the bottom longitudinal beam, a pressing ball 21 inserted in the sliding hole and extending out of the lower end surface of the support column head, a lower electric column 22 inserted in the lower end of the sliding hole, an upper conductive column 23 fixed in the upper end of the sliding hole and a spring 24 for driving the lower electric column to separate from the upper electric column. The lower electric column and the upper conductive column are connected to the controller of the control cylinder through a wire, and the pressing ball is aligned with the track. When the walking wheel is supported on the track, the pressing ball at the end where the walking wheel is located presses on the track so that the lower electric column and the upper conductive column are abutted together. When the walking wheel is lifted off the track, the lower electric column and the upper conductive column at the end where the walking wheel is lifted off the track are separated under the action of the spring; when the lower electric column and the upper conductive column are separated, it means that the walking wheel is lifted off the track. At this time, the controller controls the cylinder to drive the two friction rods to close so that the upper friction part abuts against the upper friction strip. An insulating guide column 25 is fixed on the upper end surface of the lower conductive column, a guide hole 26 is provided on the lower end surface of the upper conductive column, and a pit 27 is provided on the upper end surface of the insulating guide column. During the entire process of separation and combination of the lower electric column and the upper conductive column, the insulating guide column is always inserted in the guide hole, one end of the spring is located in the pit, and the other end is located in the guide hole.

[0022] The lower end of the guide rail is provided with a small diameter section 28, and two inverted steps 29 are formed between the guide rail and the small diameter section, and the lower ends of the two friction rods are provided with hooks 30 for hooking on the two steps one by one. When the upper friction part abuts on the upper friction strip, the hook is located directly below the step. When tipping occurs, the hook hooks the step to prevent the support frame from tipping. Two lower friction strips 37 extending along the extension direction of the track are provided on both sides of the small diameter section, and the ends of the hooks are provided with lower friction parts 32 cooperating with the lower friction strips. When the upper friction part abuts on the upper friction strip, the lower friction part abuts on the lower friction strip. The guide rail is provided with a support part 31 for supporting the running wheel, and the upper friction strip is located on both sides of the support part. A support ring groove 33 extending along the circumference of the running wheel is provided on the circumferential surface of the running wheel, and the generatrix of the support ring groove is an arc line, and the support part is supported in the support ring groove in line contact. The lower end of the segment is provided with an outer flange 34, and the upper end is provided with an inner flange 35; adjacent segments are suspended together by the inner flange being suspended on the outer flange.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for anti-tilt protection of a gantry crane, the gantry crane comprises two tracks, a crossbeam supported on the tracks by a support frame at each end, a winch arranged on the crossbeam and a hook connected to a turntable of the winch by a sling, the support frame comprises a bottom longitudinal beam and an oblique vertical beam whose lower end is connected to both ends of the bottom longitudinal beam, the upper end of the oblique vertical beam is connected to the crossbeam, and both ends of the bottom longitudinal beam are supported on the track by walking wheels, characterized in that: The gantry crane support frame can be tilted by setting a telescopic sleeve with a rigid structure and sleeved on the cable to prevent the cable from swinging. The upper end of the telescopic sleeve is fixed to the crossbeam, and the telescopic sleeve is sleeved on the cable. The hook is located at the lower end of the telescopic sleeve, and the telescopic sleeve includes a plurality of segments that can be plugged in and out in sequence. Between adjacent segments, the segment located below is hooked on the lower end of the segment located above to avoid disengagement. A supporting frame is provided on the hook, and when the hook rises, the supporting frame pushes the lower end of the sleeve to shorten the telescopic sleeve and avoid interfering with the rise of the hook. An object is hung on the hook and lifted up. During the lifting process, the telescopic sleeve is used to limit the swing of the sling, thereby preventing the swing amplitude of the object from exceeding the setting and causing the support frame to tilt.

2. A method for anti-tilt protection of a gantry crane according to claim 1, characterized in that: An anti-dumping structure is provided at each end of the support frame along the extension direction of the track, and the anti-dumping structure includes two cross-arranged friction rods hinged at the end of the bottom longitudinal beam through a hinge shaft, an oil cylinder driving the two friction rods to open and close, and a detection structure for detecting whether the walking wheel is lifted off the track. Two upper friction strips extending along the extension direction of the track are provided on both sides of the track, and the lower ends of the two friction rods are located on both sides of the track, and the friction rods are provided with upper friction parts that cooperate with the upper friction strips; when the detection structure of the anti-dumping structure detects that the walking wheel is lifted off the track, the oil cylinder of the anti-dumping structure located at the end of the bottom longitudinal beam where the walking wheel is lifted off the track drives the two friction rods to close so that the upper friction part is pressed against the upper friction strip; when tilting occurs, the friction force on the one hand offsets the force causing the tilting by lifting, and on the other hand, the friction wheel blocks the walking wheel from moving, thereby prolonging the speed of dumping and providing response time for taking anti-dumping measures.

3. A method for anti-tilt protection of a gantry crane according to claim 2, characterized in that: The detection structure includes a support column head with a sliding hole connected to the bottom longitudinal beam, a pressing ball inserted in the sliding hole and extending out of the lower end surface of the support column head, a lower electric column inserted in the lower end of the sliding hole, an upper conductive column fixed in the upper end of the sliding hole and a spring for driving the lower electric column to separate from the upper electric column. The lower electric column and the upper conductive column are connected to a controller of the oil cylinder through a wire, and the pressing ball is aligned with the track. When the walking wheel is supported on the track, the pressing ball at the end where the walking wheel is located presses on the track so that the lower electric column and the upper conductive column are abutted together. When the walking wheel is lifted off the track, the lower electric column and the upper conductive column at the end where the walking wheel is lifted off the track are separated under the action of the spring; when the lower electric column and the upper conductive column are separated, it means that the walking wheel is lifted off the track. At this time, the controller controls the oil cylinder to drive the two friction rods to close so that the upper friction part abuts against the upper friction strip.

4. A method for anti-tilt protection of a gantry crane according to claim 3, characterized in that: A small diameter section is provided at the lower end of the guide rail, and two inverted steps are formed between the guide rail and the small diameter section on both sides of the small diameter section. The lower ends of the two friction rods are provided with hooks for hooking on the two steps one by one. When the upper friction part abuts against the upper friction strip, the hook is located directly below the step. When tipping occurs, the hook hooks the step to prevent the support frame from tipping.

5. A method for anti-tilt protection of a gantry crane according to claim 4, characterized in that: Two lower friction strips extending along the extension direction of the track are arranged on both sides of the small diameter section, and a lower friction part cooperating with the lower friction strip is arranged at the end of the hook head, and when the upper friction part is pressed against the upper friction strip, the lower friction part is pressed against the lower friction strip.

6. A method for anti-tilt protection of a gantry crane according to claim 3, 4 or 5, characterized in that: An insulating guide column is fixed on the upper end surface of the lower conductive column, a guide hole is provided on the lower end surface of the upper conductive column, and a pit is provided on the upper end surface of the insulating guide column. During the entire process of separation and combination of the lower electric column and the upper conductive column, the insulating guide column is always inserted in the guide hole, and one end of the spring is located in the pit and the other end is located in the guide hole.

7. A method for protecting a gantry crane from tilting according to claim 2, 3, 4 or 5, characterized in that: The guide rail is provided with a supporting part for supporting the traveling wheel, and the upper friction strips are located on both sides of the supporting part.

8. A method for anti-tilt protection of a gantry crane according to claim 7, characterized in that: A supporting annular groove extending along the circumferential direction of the traveling wheel is provided on the circumferential surface of the traveling wheel, the generatrix of the supporting annular groove is an arc line, and the supporting portion is supported in the supporting annular groove in a line contact manner.

9. A method for anti-tilt protection of a gantry crane according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The lower end of the segment is provided with an outer turning edge, and the upper end is provided with an inner turning edge; adjacent segments are hung together by the inner turning edges being hung on the outer turning edges.

10. A method for anti-tilt protection of a gantry crane according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The connection point between the hook and the supporting frame, the lowest point of the hook and the part of the sling located in the telescopic sleeve are located in a straight line.

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