Overload device of gantry crane

Abstract

The utility model provides a gantry crane overload device which comprises a support, a swing frame, a pulley and a pressure sensor, the support is fixedly installed on a stand column of a gantry crane, the pressure sensor is fixedly installed on a bottom plate of the support, one side of the swing frame is hinged to a side plate of the support, the other side of the swing frame is fixedly provided with a pulley shaft, and the pulley is rotatably installed on the pulley shaft; a rib plate is fixedly installed on the side, close to the pressure sensor, of the swing frame, when the steel wire rope drives the swing frame to press downwards, the rib plate generates pressure on the pressure sensor, the force of the steel wire rope acts on the pressure sensor through the pulley and a lever of the swing frame, the stress of the steel wire rope can be calculated, and therefore the weight of goods hoisted by the portal crane is calculated. The device is convenient to maintain, simple in structure and light in weight, the steel wire rope is not bent reversely, fatigue of the steel wire rope can be reduced, the overload device does not have position change during amplitude variation of the portal crane, the pressure sensor is not influenced by amplitude variation of an arm support system, and the measurement precision is high.

Description

Technical field:

[0001] The utility model belongs to the technical field of port lifting machinery, and in particular relates to an overload device for a portal crane. Background technology:

[0002] Portal cranes (gantry cranes for short) are special equipment used by ports and docks to load and unload bulk cargo and general cargo. The rated lifting capacity of a gantry crane refers to the maximum weight allowed to be lifted at one time when the crane is working normally. During loading and unloading operations, the dock must pay attention to the weight of the lifted cargo not exceeding the rated lifting capacity of the gantry crane, otherwise it is easy to cause permanent damage to the crane and even cause safety accidents.

[0003] In order to prevent the weight of the cargo from exceeding the rated lifting capacity of the equipment during loading and unloading operations of the gantry crane, an overload device needs to be installed on the equipment. Generally, the force of the cargo on the lifting wire rope is converted to the pressure sensor through the wire rope pulley through a lever structure. The force of each wire rope can be obtained through the measurement and conversion of the pressure sensor. The weight value of the cargo is calculated by cumulative calculation and the set correction coefficient. This value is then compared with the rated lifting capacity to determine whether it is overloaded. The overload device takes force from the lifting wire rope and must be set where the wire rope passes. The gantry crane has a variable amplitude mechanism. The location where the overload device is installed cannot affect the sensor measurement value due to amplitude changes. At present, the overload devices of most gantry cranes are generally set on the large pull rod, using a balanced overload device.

[0004] There are three main problems with this form: (1) The overload device is installed on the large pull rod, which is located above the pedestrian walkway of the column. It is inconvenient to install a maintenance platform, otherwise people may bump their heads when passing by; if maintenance is performed on the platform at the top of the column, the height from the overload device is relatively high (about 3 meters), and people cannot conveniently repair the overload device on the top of the rotating column. When standing on the column platform for maintenance, the height is not enough, and a ladder or pad is required, which is inconvenient to operate and has poor safety; if maintenance is performed on the channel of the large pull rod, it is necessary to bend over, which poses a great safety risk. (2) The existing set of overload devices includes a beam, pulley, base, counterweight, etc. (see attached) Fig.10 ), weighing up to 1.4 tons, the device structure is complex, with many fault points, and the lifting wire rope passes under the overload pulley, causing the wire rope to bend in the opposite direction. Long-term use will cause fatigue damage to the wire rope, which will affect the service life of the wire rope. (3) The balance weight of the balanced overload device needs to adjust its force arm before use so that the weight can be balanced with the pulley and lever. This can minimize the impact of the overload device's own gravity on the pressure sensor during the amplitude change process. If the balance is not adjusted, the overload device's own gravity will affect the accuracy of the pressure sensor during the amplitude change process, and the operation is complicated.

[0005] Based on this, the utility model proposes an overload device for a portal crane to solve the above problems. Summary of the invention:

[0006] The utility model aims to provide an overload device for a portal crane in view of the deficiencies in the prior art.

[0007] The utility model adopts the following technical solutions:

[0008] The utility model provides an overload device for a gantry crane, the overload device comprising a support, a swing frame, a pulley and a pressure sensor; the support is fixedly connected to the gantry crane; the pressure sensor is fixedly mounted on the bottom plate of the support; one side of the swing frame is hinged to the side plate of the support, and the other side is fixedly mounted with a pulley shaft, and the pulley is rotatably mounted on the pulley shaft; a rib plate is fixedly mounted on the side of the swing frame close to the pressure sensor.

[0009] Furthermore, the support includes a support base plate and n mutually parallel support side plates, the support side plates are vertically fixedly installed on the same side of the support base plate, and the pressure sensor is fixedly installed on the support base plate; the number of the swing frame and the pulley is n-1; the swing frame includes two mutually parallel swing frame side plates, and the two swing frame side plates are hingedly installed on the inner sides of two adjacent support side plates; a mounting hole is provided on the side of the swing frame side plate away from the support, and the pulley shaft passes through the mounting holes of the two swing frame side plates and is fixedly connected to the swing frame side plates; the pulley is distributed between the two swing frame side plates and is rotatably connected to the pulley shaft through a bearing.

[0010] Furthermore, the swing frame and the support are hinged through a hinge axis; a mounting hole is provided on the support side plate, and the hinge axis passes through the mounting hole and is fixedly connected to the support side plate; a through hole adapted to the hinge axis is opened on the swing frame side plate, and the swing frame side plate is sleeved on the outside of the hinge axis through the through hole.

[0011] Furthermore, a hinge sleeve is provided between the two sets of swing frame side plates, the hinge sleeve is sleeved on the outside of the hinge shaft, and the cross-sectional diameter of the hinge sleeve is larger than the diameter of the through hole opened in the swing frame side plate.

[0012] Furthermore, a hinge axis clamp is provided at the hinge axis; a through hole is provided on the hinge axis clamp, a connecting plate is provided at the end of the hinge axis, and bolt holes corresponding to the through hole are provided on the connecting plate and the support side plate, and the hinge axis, the support side plate and the hinge axis clamp are fixedly connected by passing the bolts through the through hole and screwing them into the threaded holes.

[0013] Furthermore, a pulley shaft clamp is provided at the pulley shaft; a through hole is provided on the pulley shaft clamp, a connecting plate is provided on the end of the pulley shaft, and bolt holes corresponding to the through hole are provided on the connecting plate and the swing frame side plate, and the pulley shaft, the swing frame side plate and the pulley shaft clamp are fixedly connected by passing the bolt through the through hole and screwing it into the threaded hole.

[0014] Furthermore, a rope blocking device is provided, and the rope blocking device is fixedly connected to the swing frame.

[0015] Furthermore, the rope blocking device includes a rope blocking rod and two sets of parallel rope blocking brackets; one end of the rope blocking bracket is fixedly connected to the side plate of the swing frame, and the other end of the rope blocking bracket is provided with a through hole; threaded columns are respectively provided at both ends of the rope blocking rod, and the rope blocking rod passes through the through holes of the two sets of rope blocking brackets and is respectively fixed by two nuts.

[0016] Furthermore, the rib plate is installed between the two swing frame side plates and is fixedly connected to the two swing frame side plates respectively. When the steel wire rope drives the swing frame to be pressed down, the rib plate installed on the swing frame generates pressure on the pressure sensor.

[0017] Furthermore, the support is fixedly mounted on a column of the portal crane.

[0018] Beneficial effects of the present invention:

[0019] (1) The utility model installs the overload device behind the door machine column, which is convenient for setting up a maintenance platform behind the column, and better ensures the convenience and safety of maintenance operations;

[0020] (2) The steel wire rope of the utility model has no reverse bending, which reduces steel wire rope fatigue and prolongs the service life of the steel wire rope;

[0021] (3) The utility model reduces the number of parts and components of the overload device and reduces its weight, which is beneficial to installation and disassembly by personnel on the one hand and to cost saving on the other hand;

[0022] (4) The utility model installs the overload device on the gantry crane column. When the gantry crane changes its amplitude, the overload device will not change its position, the boom system amplitude change will not affect the pressure sensor, and the accuracy of the overload sensor will not change due to installation errors. There is no need to balance the counterweight, and there is no need to manually adjust the counterweight arm, which prevents the measurement deviation of the lifting weight caused by improper adjustment of the counterweight.

[0023] (5) The utility model is simple to manufacture, highly practical, can achieve uniform part sizes, and can be customized for mass production. Description of the drawings:

[0024] Figure 1 This is a three-dimensional diagram of the overload device of the utility model;

[0025] Figure 2 This is the front view of the overload device of the utility model;

[0026] Figure 3 This is a top view of the overload device of the utility model;

[0027] Figure 4 This is a side view of the overload device of the utility model;

[0028] Figure 5 This is a schematic diagram of the support structure of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the swing frame of the utility model;

[0030] Figure 7 This is a side view of the swing frame structure of the utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the rope blocking device of the utility model;

[0032] Fig. 9 This is a schematic diagram of the installation position of the overload device of the utility model;

[0033] Fig.10 It is a schematic diagram of the structure of the overload device in the prior art;

[0034] The symbols in the accompanying drawings are:

[0035] 1. Support; 1-1. Support bottom plate; 1-2. Support side plate; 2. Swing frame; 2-1. Swing frame side plate; 3. Pulley; 4. Pressure sensor; 5. Pulley shaft; 6. Hinge shaft; 7. Hinge shaft sleeve; 8. Hinge shaft clamp; 9. Pulley shaft clamp; 10. Rope blocking device; 10-1. Rope blocking rod; 10-2. Rope blocking bracket; 10-3. Nut; 11. Rib plate; 12. Large pull rod; 13. Elephant trunk bridge; 14. Boom; 15. Small pull rod; 16. Column; A. Overload device installation position. Specific implementation method:

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0037] Example 1

[0038] Reference Figures 1 to 4This embodiment provides an overload device for a portal crane, the overload device comprising a support 1, a swing frame 2, a pulley 3 and a pressure sensor 4. The support 1 is fixedly mounted on the column of the portal crane ( Fig. 9 ), the pressure sensor 4 is fixedly mounted on the bottom plate of the support 1. One side of the swing frame 2 is hinged to the side plate of the support 1, and the other side is fixedly mounted with a pulley shaft 5, on which the pulley 3 is rotatably mounted, and the position of the pulley 3 corresponds to the position of the lifting wire rope, and the rotation direction of the pulley 3 is consistent with the direction of the wire rope. A rib plate 11 is fixedly mounted on the side of the swing frame 2 close to the pressure sensor 4, and when the wire rope drives the swing frame 2 to press down, the rib plate 11 installed on the swing frame 2 generates pressure on the pressure sensor 4.

[0039] When in use, the lifting wire rope is placed in the rope groove on the surface of the pulley 3. The movement of the lifting wire rope drives the pulley 3 to rotate. At the same time, the lifting wire rope generates an oblique downward pressure (pointing to the center of the pulley 3) on the pulley 3, and then generates pressure on the swing frame 2. The rib plate 11 fixed in the swing frame 2 generates pressure on the pressure sensor 4, so that the lifting wire rope force acts on the pressure sensor 4 through the pulley and the lever of the swing frame. The force on the lifting wire rope can be calculated, thereby calculating the weight of the goods lifted by the gate crane.

[0040] Example 2

[0041] The main structure of this embodiment is the same as that of Embodiment 1, except that this embodiment further defines the structures of the support 1 and the swing frame 2.

[0042] Specifically, refer to Figures 5 to 7 The support 1 includes a support base plate 1-1 and three support side plates 1-2 that are parallel to each other and equidistantly distributed. The support side plates 1-2 are vertically fixedly installed on the same side of the support base plate 1-1. The support 1 is used to support the swing frame 2 and install the pressure sensor 4. The support base plate 1-1 is drilled with threaded holes, and the pressure sensor 4 is fixed to the support base plate 1-1 by bolt fixings.

[0043] In this embodiment, the number of the swing frame 2 and the pulley 3 is two.

[0044] The swing frame 2 includes two swing frame side plates 2-1 parallel to each other, and the two swing frame side plates 2-1 are hingedly installed on the inner sides of two adjacent support side plates 1-2. The rib plate 11 is installed between the two swing frame side plates 2-1 and fixedly connected to the two swing frame side plates 2-1 respectively. The rib plate 11 can not only play a role in strengthening the structure, but also can press the wire rope force on the pulley 3 to the pressure sensor 4 through the rib plate 11 when the pulley 3 is subjected to force, so that the pressure sensor 4 can calculate the wire rope force. The side of the swing frame side plate 2-1 away from the support 1 is provided with a mounting hole, and the pulley shaft 5 passes through the mounting holes of the two swing frame side plates 2-1 and is fixedly connected to the swing frame side plates 2-1. The pulley 3 is distributed between the two swing frame side plates 2-1 and is rotatably connected to the pulley shaft 5 through a bearing. The two swing frames 2 correspond to two pulleys 3 respectively, and the two pulleys 3 correspond to two sets of steel wire ropes respectively. The two swing frames 2 and the pulleys 3 can swing separately, and the swing frame 2 corresponding to each steel wire rope can swing separately, so that the measurement of the pressure sensor 4 is more accurate.

[0045] In this embodiment, a pulley shaft clamp 9 is provided at the pulley shaft 5, and a through hole is provided on the pulley shaft clamp 9. A connecting plate is provided at the end of the pulley shaft 5, and bolt holes corresponding to the through hole are provided on the connecting plate and the swing frame side plate 2-1. The pulley shaft 5, the swing frame side plate 2-1 and the pulley shaft clamp 9 are fixedly connected by passing the bolts through the through holes and screwing them into the threaded holes.

[0046] Since the two steel ropes of the gantry crane are relatively close to each other, this embodiment adopts a design of installing two swing frames on the same support, so that the distance between the two pulleys of the overload device matches the distance between the lifting steel ropes, avoiding the wear of the steel ropes due to excessive deflection angle when the steel ropes pass through the pulleys, thereby affecting the service life.

[0047] Example 3

[0048] The main structure of this embodiment is the same as that of Embodiment 2, except that this embodiment further limits the installation method of the swing frame 2 and the support 1.

[0049] Specifically, refer to Figures 1 to 7 , the swing frame 2 is hinged to the support 1 through the hinge shaft 6; the support side plate 1-2 is provided with a mounting hole, the hinge shaft 6 passes through the mounting holes of the two support side plates 1-2 and is fixedly connected to the support side plate 1-2, the swing frame side plate 2-1 is provided with a through hole adapted to the hinge shaft 6, and the swing frame side plate 2-1 is sleeved on the outside of the hinge shaft 6 through the through hole. A hinge shaft sleeve 7 is provided between the two sets of swing frame side plates 2-1, the hinge shaft sleeve 7 is sleeved on the outside of the hinge shaft 6, and the cross-sectional diameter of the hinge shaft sleeve 7 is larger than the diameter of the through hole provided in the swing frame side plate 2-1.

[0050] In this embodiment, a hinge axis clamp 8 is provided at the hinge axis 6; a through hole is provided on the hinge axis clamp 8, a connecting plate is provided at the end of the hinge axis 6, and bolt holes corresponding to the through hole are provided on the connecting plate and the support side plate 1-2. The hinge axis 6, the support side plate 1-2 and the hinge axis clamp 8 are fixedly connected by passing the bolts through the through hole and screwing them into the threaded holes.

[0051] Example 4

[0052] The main structure of this embodiment is the same as that of Embodiment 3, except that a rope blocking device 10 is further provided in this embodiment.

[0053] Reference Figure 1 and Figure 8 , the rope blocking device 10 is fixedly connected to the swing frame 2.

[0054] Specifically, the rope blocking device 10 includes a rope blocking rod 10-1 and two sets of parallel rope blocking brackets 10-2. The rope blocking rod 10-1 is arranged between the two sets of rope blocking brackets 10-2. One end of the rope blocking bracket 10-2 is fixedly connected to the swing frame side plate 2-1, and the other end of the rope blocking bracket 10-2 is provided with a through hole. The two ends of the rope blocking rod 10-1 are respectively provided with threaded columns. The rope blocking rod 10-1 passes through the through holes of the two sets of rope blocking brackets 10-2 and is fixed by two nuts 10-3 and washers respectively. The rope blocking device 10 is used to prevent the wire rope from jumping out of the pulley rope groove, so as to avoid the wire rope jumping out of the groove causing damage to the overload device.

[0055] In this embodiment, the welding angle of the rope blocking bracket 10-2 can be adjusted so that the steel wire rope is always in the pulley 3 and will not jump out of the pulley groove, thereby protecting the overload device.

[0056] The assembly steps of the device of the utility model are as follows: connect the pressure sensor 4 and its mounting base plate to the support base plate 1-1 by bolts; install the pulley 3, pulley shaft 5 and pulley sleeve on the swing frame 2, and fix the end of the pulley shaft 5 with the pulley shaft clamp 9; install the assembled swing frame 2, hinge shaft 6 and hinge sleeve on the support 1, and fix the end of the hinge shaft 6 with the hinge shaft clamp 8; finally, according to the angle of the wire rope, position and weld the rope stop bracket 10-2 so that the rope stop rod 10-1 is located at the tangent position of the wire rope and the pulley.

[0057] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present utility model should be regarded as the protection scope of the present utility model.

Claims

1. An overload device for a portal crane, characterized in that: The overload device comprises a support (1), a swing frame (2), a pulley (3) and a pressure sensor (4); The support (1) is fixedly connected to the portal crane; The pressure sensor (4) is fixedly mounted on the bottom plate of the support (1); One side of the swing frame (2) is hinged to the side plate of the support (1), and the other side is fixedly mounted with a pulley shaft (5), and the pulley (3) is rotatably mounted on the pulley shaft; a rib plate (11) is fixedly mounted on the side of the swing frame (2) close to the pressure sensor (4).

2. The portal crane overload device according to claim 1, characterized in that: The support (1) comprises a support base plate (1-1) and n mutually parallel support side plates (1-2), wherein the support side plates (1-2) are vertically fixedly mounted on the same side of the support base plate (1-1); the pressure sensor (4) is fixedly mounted on the support base plate (1-1); The number of the swing frames (2) and pulleys (3) is n-1; The swing frame (2) comprises two swing frame side plates (2-1) parallel to each other, and the two swing frame side plates (2-1) are hingedly mounted on the inner sides of two adjacent support side plates (1-2); a mounting hole is provided on a side of the swing frame side plate (2-1) away from the support (1), and the pulley shaft (5) passes through the mounting holes of the two swing frame side plates (2-1) and is fixedly connected to the swing frame side plates (2-1); The pulley (3) is distributed between the two swing frame side plates (2-1) and is rotationally connected to the pulley shaft (5) via a bearing.

3. The portal crane overload device according to claim 2, characterized in that: The swing frame (2) and the support (1) are hingedly connected via a hinge axis (6); The support side plate (1-2) is provided with a mounting hole, and the hinge point shaft (6) passes through the mounting hole and is fixedly connected to the support side plate (1-2); the swing frame side plate (2-1) is provided with a through hole adapted to the hinge point shaft (6), and the swing frame side plate (2-1) is sleeved on the outside of the hinge point shaft (6) through the through hole.

4. The portal crane overload device according to claim 3, characterized in that: A hinge point sleeve (7) is arranged between the two sets of swing frame side plates (2-1), the hinge point sleeve (7) is sleeved on the outside of the hinge point shaft (6), and the cross-sectional diameter of the hinge point sleeve (7) is larger than the diameter of the through hole opened in the swing frame side plate (2-1).

5. The portal crane overload device according to claim 3, characterized in that: A hinge axis clamping plate (8) is provided at the hinge axis (6); The hinge shaft clamp (8) is provided with a through hole, the end of the hinge shaft (6) is provided with a connecting plate, and the connecting plate and the support side plate (1-2) are provided with bolt holes corresponding to the through hole, and the hinge shaft (6), the support side plate (1-2) and the hinge shaft clamp (8) are fixedly connected by passing the bolt through the through hole and screwing it into the threaded hole.

6. The portal crane overload device according to claim 2, characterized in that: A pulley shaft clamping plate (9) is provided at the pulley shaft (5); The pulley shaft clamping plate (9) is provided with a through hole, the end of the pulley shaft (5) is provided with a connecting plate, and the connecting plate and the swing frame side plate (2-1) are provided with bolt holes corresponding to the through hole, and the pulley shaft (5), the swing frame side plate (2-1) and the pulley shaft clamping plate (9) are fixedly connected by passing the bolt through the through hole and screwing it into the threaded hole.

7. The portal crane overload device according to claim 2, characterized in that: A rope blocking device (10) is also provided, and the rope blocking device (10) is fixedly connected to the swing frame (2).

8. The portal crane overload device according to claim 7, characterized in that: The rope blocking device (10) comprises a rope blocking rod (10-1) and two sets of parallel rope blocking brackets (10-2); One end of the rope blocking bracket (10-2) is fixedly connected to the swing frame side plate (2-1), and the other end of the rope blocking bracket (10-2) is provided with a through hole; threaded columns are respectively provided at both ends of the rope blocking rod (10-1), and the rope blocking rod (10-1) passes through the through holes of the two groups of rope blocking brackets (10-2) and is fixed by two nuts (10-3) respectively.

9. The portal crane overload device according to claim 2, characterized in that: The rib plate (11) is installed between the two swing frame side plates (2-1) and is fixedly connected to the two swing frame side plates (2-1) respectively. When the steel wire rope drives the swing frame (2) to press downward, the rib plate (11) installed on the swing frame (2) generates pressure on the pressure sensor (4).

10. The portal crane overload device according to claim 1, characterized in that: The support (1) is fixedly mounted on a column of a portal crane.

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