Positioning device of hoisting mechanism

Abstract

The utility model discloses a hoisting mechanism positioning device, and aims to provide an absolute value encoder for checking the number of rotation turns of a winding drum, enable a cam limit switch to check at a fixed point, and simultaneously enable the absolute value encoder and the cam limit switch to be arranged side by side, so that the layout is more reasonable. Comprising a winding drum for winding a steel wire rope, and a first rotating shaft is fixed to the winding drum and coaxial with the rotating axis of the winding drum; the device further comprises a split shaft box, an absolute value encoder and a cam limiting switch, two second rotating shafts are arranged in the split shaft box at intervals, the second rotating shafts are rotationally connected with the split shaft box and extend to the outside of the split shaft box, first gears are arranged on the first rotating shafts, second gears are arranged on the second rotating shafts, and the first gears are meshed with the second gears; wherein one second rotating shaft is connected with an absolute value encoder, and the other second rotating shaft is connected with a cam limit switch.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting equipment, and more specifically relates to a lifting mechanism positioning device. Background Art

[0002] At present, the lifting mechanism of port gantry crane basically adopts drum to reel in or release wire rope to raise and lower grab bucket.

[0003] In order to monitor the lifting height of the grab bucket, an incremental encoder is installed at the tail of the motor to calculate the height. The incremental encoder obtains the number of rotations of the drum based on the transmission ratio and converts it into the lifting height of the grab bucket through calculation.

[0004] The incremental encoder does not measure absolute position data, and the data cannot be saved when the power is off. During the operation, it is necessary to ensure that there is no abnormality in the incremental encoder and the data obtained is absolutely accurate, otherwise it will affect the final calculation result. If an error occurs, it will affect the safety of the operation. Therefore, consider adding an additional detection position to verify the data obtained by the absolute encoder. At the same time, there is not much space reserved at both ends of the reel's rotation axis. The reel is also connected to a cam limit switch for fixed-point verification. Therefore, when adding a detection position, this point needs to be taken into account to avoid interference with the cam limit switch. Utility Model Content

[0005] The main purpose of the utility model is to provide a lifting mechanism positioning device, which aims to set an absolute value encoder to check the number of rotations of the reel, so that the cam limit switch can be checked at a fixed point. At the same time, the absolute value encoder and the cam limit switch are arranged side by side, and the layout is more reasonable.

[0006] According to a first aspect of the utility model, a lifting mechanism positioning device is provided, comprising a drum for winding a wire rope, a first rotating shaft being fixed on the drum, the first rotating shaft being coaxial with a rotation axis of the drum;

[0007] It also includes a split shaft box, an absolute value encoder and a cam limit switch, wherein two second rotating shafts are arranged in the split shaft box at intervals, the second rotating shafts are rotatably connected to the split shaft box and extend to the outside of the split shaft box, the first rotating shaft is provided with a first gear, the second rotating shaft is provided with a second gear, and the first gear is meshed with the second gear;

[0008] One of the second rotating shafts is connected to the absolute value encoder, and the other of the second rotating shafts is connected to the cam limit switch.

[0009] In the above-mentioned lifting mechanism positioning device, it also includes a base plate, on which a first base, a second base and a third base are provided, the split shaft box is fixed on the first base, the first base and the second base are both located on the side of the first base facing away from the reel, the absolute value encoder is fixed on the second base, and the cam limit switch is fixed on the third base.

[0010] In the above-mentioned lifting mechanism positioning device, the first base includes a first vertical plate fixed on the base plate, a first horizontal plate is provided on the top of the first vertical plate, the split axle box is fixed on the first horizontal plate, and a plurality of reinforcing plates are provided between the first horizontal plate and the base plate.

[0011] In the above-mentioned lifting mechanism positioning device, the second base includes a second horizontal plate fixed on the base plate, a second vertical plate is provided on the side of the second horizontal plate close to the first base, the absolute value encoder is fixed on the second vertical plate, and a reinforcing rib is provided between the second vertical plate and the second horizontal plate.

[0012] In the above-mentioned lifting mechanism positioning device, a support plate is provided on the side of the second horizontal plate away from the first base, and the support plate is located below the absolute value encoder. The absolute value encoder is located between the second vertical plate and the support plate. The top of the support plate is provided with a first notch adapted to the cable of the absolute value encoder, and also includes a locking piece, which fixes the cable of the absolute value encoder in the first notch.

[0013] In the above-mentioned lifting mechanism positioning device, the support plate is provided with a through hole extending from its top surface to the side surface, and the locking member is a cable tie, which passes through the through hole to fix the cable of the absolute encoder in the first notch.

[0014] In the above-mentioned lifting mechanism positioning device, the third base includes a third vertical plate fixed on the base plate, a third horizontal plate is provided on the top of the third vertical plate, the cam limit switch is fixed on the third horizontal plate, and a second notch adapted to the cable of the cam limit switch is provided on the side of the third horizontal plate facing away from the first base.

[0015] In the above-mentioned lifting mechanism positioning device, it also includes an inverted U-shaped protective cover, which is respectively connected to the second base and the third base on both sides along its recessed direction to cover the absolute encoder and the cam limit switch; the protective cover is located on the side of the split shaft box away from the reel.

[0016] In the above-mentioned lifting mechanism positioning device, the protective cover is composed of a mesh plate.

[0017] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0018] In the utility model, a split-axle box is provided, and a gear transmission structure is utilized to allow the first rotating shaft to simultaneously drive the two second rotating shafts to rotate, and the number of rotations of the drum is reflected by the second rotating shafts. Therefore, both the absolute value encoder and the cam limit switch can obtain the number of rotations of the drum, and the cam limit switch can be calibrated at a fixed point, while the absolute value encoder can be mutually calibrated with the incremental encoder at the tail of the motor, so as to ensure the correctness of the numerical value and the positioning accuracy of the door crane lifting mechanism. Since a split-axle box is provided, the absolute value encoder and the cam limit switch can be arranged side by side, and there is no need to superimpose them on the axial direction of the drum, and there is no need to reserve a large space at both ends of the drum's rotation axis, and the layout of the entire positioning device is more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0020] Figure 1 It is a top view of the first embodiment of the utility model without the protective cover;

[0021] Figure 2 This is a schematic diagram of the structure of the first embodiment of the utility model after removing the reel;

[0022] Figure 3 It is a schematic structural diagram of the first embodiment of the utility model after removing the reel and the protective cover.

[0023] Among them, the reference numerals of the figures are:

[0024] 1. Reel; 2. First rotating shaft; 3. Split shaft box; 31. Second rotating shaft; 4. Absolute encoder; 5. Cam limit switch; 6. Base plate; 7. First base; 71. First vertical plate; 72. First horizontal plate; 73. Reinforcement plate; 8. Second base; 81. Second horizontal plate; 82. Second vertical plate; 83. Reinforcement rib plate; 84. Support plate; 841. First notch; 9. Third base; 91. Third vertical plate; 92. Third horizontal plate; 93. Second notch; 10. Protective cover. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0027] Reference Figures 1 to 3 As shown, in one embodiment of the utility model, a lifting mechanism positioning device comprises a drum 1 for winding a wire rope, a first rotating shaft 2 is fixed on the drum 1, and the first rotating shaft 2 is coaxial with the rotating axis of the drum 1;

[0028] The invention also includes a split shaft box 3, an absolute value encoder 4 and a cam limit switch 5. Two second rotating shafts 31 are arranged in the split shaft box 3 at intervals. The second rotating shaft 31 is rotatably connected with the split shaft box 3 and extends to the outside of the split shaft box 3. A first gear is arranged on the first rotating shaft 2, and a second gear is arranged on the second rotating shaft 31. The first gear is meshed with the second gear. The rotation of the first gear drives the two second gears to rotate synchronously, but the two second gears rotate in opposite directions.

[0029] One of the second rotating shafts 31 is connected to the absolute value encoder 4, and the other second rotating shaft 31 is connected to the cam limit switch 5;

[0030] A split shaft box 3 is provided, and a gear transmission structure is utilized to allow the first rotating shaft 2 to simultaneously drive the two second rotating shafts 31 to rotate, and the number of rotations of the drum 1 is reflected by the second rotating shafts 31. Therefore, the absolute value encoder 4 and the cam limit switch 5 can both obtain the number of rotations of the drum 1, and the cam limit switch 5 can be calibrated at a fixed point, while the absolute value encoder 4 can be mutually verified with the incremental encoder at the tail of the motor to ensure the correctness of the numerical value and the positioning accuracy of the gantry crane lifting mechanism. Since the split shaft box 3 is provided, the absolute value encoder 4 and the cam limit switch 5 can be arranged side by side, and there is no need to superimpose them on the axial direction of the drum 1, and there is no need to reserve a large space at both ends of the drum 1's rotation axis, and the layout of the entire positioning device is more reasonable.

[0031] In this embodiment, the first rotating shaft 2 extends into the split shaft box 3, the first gear and the second gear are both located in the split shaft box 3, and grease or lubricating oil can be provided in the split shaft box 3 to lubricate and cool the first gear and the second gear; the first rotating shaft 2 is first matched with the split shaft box 3 and then connected to the reel 1.

[0032] In this embodiment, it also includes a base plate 6, on which a first base 7, a second base 8 and a third base 9 are provided, the split shaft box 3 is fixed on the first base 7, the first base 7 and the second base 8 are both located on the side of the first base 7 facing away from the reel 1, the absolute value encoder 4 is fixed on the second base 8, and the cam limit switch 5 is fixed on the third base 9; in this way, the split shaft box 3, the absolute value encoder 4 and the cam limit switch 5 are all in suitable positions for easy connection.

[0033] In this embodiment, the first base 7 includes a first vertical plate 71 fixed on the base plate 6, a first horizontal plate 72 is provided on the top of the first vertical plate 71, the split-axle box 3 is fixed on the first horizontal plate 72, and a plurality of reinforcing plates 73 are provided between the first horizontal plate 72 and the base plate 6 to enhance the stability of the first horizontal plate 72; since the split-axle box 3 is relatively heavy, the first vertical plate 71 and the base plate 6 can be integrally formed, and the first vertical plate 71 has better strength.

[0034] In this embodiment, the second base 8 includes a second horizontal plate 81 fixed on the base plate 6, a second vertical plate 82 is provided on the side of the second horizontal plate 81 close to the first base 7, the absolute encoder 4 is fixed on the second vertical plate 82, and a reinforcing rib 83 is provided between the second vertical plate 82 and the second horizontal plate 81;

[0035] The second transverse plate 81 and the second vertical plate 82 need to be designed according to the position of the second rotating shaft 31 so that the absolute encoder 4 can be aligned with the second rotating shaft 31 , and the reinforcing ribs 83 are used to reinforce the second vertical plate 82 .

[0036] Preferably, a support plate 84 is provided on the side of the second horizontal plate 81 away from the first base 7, and the support plate 84 is located below the absolute encoder 4. The absolute encoder 4 is located between the second vertical plate 82 and the support plate 84. The cable of the absolute encoder 4 is located at the end away from the split shaft box 3 and extends downward. The top of the support plate 84 is provided with a first notch 841 adapted to the cable of the absolute encoder 4. The cable of the absolute encoder 4 is fixed in the first notch 841 by a locking piece, which can prevent the cable from shaking. Even if someone accidentally touches the cable, the cable will not pull the absolute encoder 4, thereby reducing the probability of an accident with the absolute encoder 4.

[0037] Specifically, the support plate 84 is provided with a through hole extending from the top surface to the side surface thereof, and the locking member is a cable tie, which passes through the through hole to fix the cable of the absolute encoder 4 in the first notch 841 .

[0038] In some other embodiments, the locking member may be a rope or a buckle, as long as the cable can be fixed on the support plate 84, and the present application does not impose any limitation on this.

[0039] In this embodiment, the third base 9 includes a third vertical plate 91 fixed on the base plate 6, a third horizontal plate 92 is provided on the top of the third vertical plate 91, the cam limit switch 5 is fixed on the third horizontal plate 92, and the third horizontal plate 92 is provided with a second notch 93 adapted to the cable of the cam limit switch 5 on the side facing away from the first base 7. The cable of the cam limit switch 5 is located at the end away from the split shaft box 3 and extends downward. The cable of the cam limit switch 5 is located in the second notch 93 to prevent the cable from being touched.

[0040] Furthermore, the cable of the cam limit switch 5 can be fixed to the second notch 93 by using a cable tie, a rope or the like.

[0041] In some embodiments, an inverted U-shaped protective cover 10 may be provided, and the protective cover 10 is connected to the second base 8 and the third base 9 on both sides along the concave direction thereof, respectively, so as to cover the absolute encoder 4 and the cam limit switch 5. In this way, the protective cover 10 can prevent the absolute encoder 4 and the cam limit switch 5 from being hit, thereby improving safety.

[0042] Moreover, the protective cover 10 is located on the side of the split shaft box 3 away from the reel 1, and the protective cover 10 does not cover the split shaft box 3, which is convenient for the maintenance of the split shaft box 3, and there is no need to remove the protective cover 10 when filling the lubricating oil;

[0043] Even the protective cover 10 can be made of a mesh plate to facilitate heat dissipation, and the conditions of the absolute encoder 4 and the cam limit switch 5 can also be observed.

[0044] Generally speaking, the protective cover 10 is connected to the second transverse plate 81 and the third transverse plate 92 by screws at both sides along the concave direction thereof, so as to be fixed.

[0045] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate 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 claims and their equivalents.

Claims

1. A lifting mechanism positioning device, characterized in that: It comprises a drum for winding a steel wire rope, a first rotating shaft is fixed on the drum, and the first rotating shaft is coaxial with the rotating axis of the drum; It also includes a split shaft box, an absolute value encoder and a cam limit switch, wherein two second rotating shafts are arranged in the split shaft box at intervals, the second rotating shafts are rotatably connected to the split shaft box and extend to the outside of the split shaft box, the first rotating shaft is provided with a first gear, the second rotating shaft is provided with a second gear, and the first gear is meshed with the second gear; One of the second rotating shafts is connected to the absolute value encoder, and the other of the second rotating shafts is connected to the cam limit switch.

2. The lifting mechanism positioning device according to claim 1, characterized in that: It also includes a base plate, on which a first base, a second base and a third base are provided, the split shaft box is fixed on the first base, the first base and the second base are both located on the side of the first base facing away from the reel, the absolute value encoder is fixed on the second base, and the cam limit switch is fixed on the third base.

3. The lifting mechanism positioning device according to claim 2, characterized in that: The first base comprises a first vertical plate fixed on the base plate, a first horizontal plate is arranged on the top of the first vertical plate, the split shaft box is fixed on the first horizontal plate, and a plurality of reinforcing plates are arranged between the first horizontal plate and the base plate.

4. The lifting mechanism positioning device according to claim 2, characterized in that: The second base includes a second transverse plate fixed on the base plate, a second vertical plate is provided on a side of the second transverse plate close to the first base, the absolute encoder is fixed on the second vertical plate, and a reinforcing rib is provided between the second vertical plate and the second transverse plate.

5. The lifting mechanism positioning device according to claim 4, characterized in that: A support plate is provided on the side of the second horizontal plate away from the first base, and the support plate is located below the absolute value encoder. The absolute value encoder is located between the second vertical plate and the support plate. A first notch adapted to the cable of the absolute value encoder is provided on the top of the support plate, and also includes a locking piece, which fixes the cable of the absolute value encoder in the first notch.

6. The lifting mechanism positioning device according to claim 5, characterized in that: The support plate is provided with a through hole extending from the top surface to the side surface thereof, and the locking member is a cable tie, which passes through the through hole to fix the cable of the absolute encoder in the first notch.

7. The lifting mechanism positioning device according to claim 2, characterized in that: The third base includes a third vertical plate fixed on the base plate, a third horizontal plate is provided on the top of the third vertical plate, the cam limit switch is fixed on the third horizontal plate, and a second notch adapted to the cable of the cam limit switch is provided on the side of the third horizontal plate facing away from the first base.

8. The lifting mechanism positioning device according to claim 2, characterized in that: It also includes an inverted U-shaped protective cover, which is connected to the second base and the third base on both sides along its concave direction to cover the absolute encoder and the cam limit switch; the protective cover is located on the side of the split shaft box away from the reel.

9. The lifting mechanism positioning device according to claim 8, characterized in that: The protective cover is composed of a mesh plate.

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