Gantry crane luffing mechanism

Abstract

The utility model discloses a gantry crane luffing mechanism, which aims to check data obtained by an absolute value encoder by using a proximity switch and ensure the positioning accuracy, and adopts the technical scheme that the gantry crane luffing mechanism comprises a rack and an arm support, one end of the arm support is hinged on the rack, the rack is provided with a driving unit, a gear and a rack, and the rack is connected with the rack. The rack is in sliding fit with the rack, one end of the rack is hinged to the arm frame, the gear is matched with the rack, and the driving unit drives the gear to rotate; a rotating shaft is arranged on the gear, the rotating shaft and the gear are coaxial, and the end, away from the gear, of the rotating shaft is connected with an absolute value encoder; a proximity switch is arranged on the arm support, a sensing plate is fixed on the rack, and when the arm support swings to a preset angle, the proximity switch is matched with the sensing plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of port equipment, and more specifically relates to a gantry crane luffing mechanism. Background Art

[0002] Gantry cranes are very common equipment in ports and are widely used in cargo collection and unloading, ship loading and unloading, and stacking.

[0003] The gantry crane includes a boom, which can adjust the grabbing position by changing the amplitude. Generally speaking, the boom is hinged on the frame, and the motor drives the gear to rotate, and the gear drives the rack to move. The rack is connected to the boom, and the movement of the rack drives the boom to change its amplitude, thereby changing the angle between the boom and the horizontal plane.

[0004] Therefore, in the prior art, an absolute encoder is used to detect the number of rotations of the gear, and then the position information of the rack is obtained. The angle between the arm and the horizontal plane at this time is determined through the correspondence between the rack position and the angle value. However, in this structure, only the absolute encoder is relied upon to obtain data, and there is no verification mechanism. Once a problem occurs with the absolute encoder, it cannot be discovered in time. During the operation, the correct angle cannot be obtained, affecting the safety of the operation. Utility Model Content

[0005] The main purpose of the utility model is to provide a door machine luffing mechanism, which aims to use a proximity switch to verify the data obtained by an absolute value encoder to ensure positioning accuracy.

[0006] According to a first aspect of the utility model, a gantry crane luffing mechanism is provided, comprising a frame and an arm, one end of the arm is hinged on the frame, a driving unit, a gear and a rack are provided on the frame, the rack is slidably matched with the frame, one end of the rack is hinged with the arm, the gear is matched with the rack, and the driving unit drives the gear to rotate;

[0007] The gear is provided with a rotating shaft, the rotating shaft is coaxial with the gear, and an absolute value encoder is connected to one end of the rotating shaft away from the gear;

[0008] The arm is provided with a proximity switch, and the frame is fixed with a sensing plate. When the arm is swung to a preset angle, the proximity switch cooperates with the sensing plate.

[0009] In the above-mentioned gantry crane luffing mechanism, it also includes a first direction, which is parallel to the rotation axis of the arm, and the proximity switch is located at one end of the arm along the first direction.

[0010] In the above-mentioned gantry crane luffing mechanism, the proximity switch is located at one end of the arm close to the frame.

[0011] In the above-mentioned gantry crane luffing mechanism, a bracket is provided on the arm, the proximity switch is arranged on the bracket, and the position of the proximity switch on the bracket is adjustable to adjust the distance between the proximity switch and the sensing plate.

[0012] In the above-mentioned gantry crane luffing mechanism, the bracket includes a base fixed on the arm, the base is provided with a guide rail, the guide rail is provided with a T-shaped slot, and the T-shaped slot extends along the first direction;

[0013] It also includes a mounting plate, on which bolts are provided. The bolts cooperate with the T-slots to fix the mounting plate on the guide rail, and the proximity switch is fixed on the mounting plate.

[0014] In the above-mentioned door crane luffing mechanism, the base is provided with a groove matched with the end of one end of the guide rail along the first direction, and the guide rail is inserted in the groove and detachably connected to the base.

[0015] In the above-mentioned gantry crane luffing mechanism, the base includes a bottom plate and a rectangular frame fixed on the bottom plate, the rectangular frame surrounds the groove on the bottom plate, and reinforcing ribs are provided between the outer wall of the rectangular frame and the bottom plate.

[0016] In the above-mentioned luffing mechanism of the door crane, the depth of the groove is 0.3 to 0.5 times the length of the guide rail.

[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, an absolute encoder is used to obtain the number of rotations of the gear, so as to calculate the angle of the boom. At the same time, a proximity switch is provided. When the boom swings to a preset angle, the proximity switch cooperates with the induction plate to obtain a signal. At this time, a check can be performed to determine whether the angle calculated according to the absolute encoder data is the preset angle. Each time the boom swings to the preset angle, the proximity switch will receive a signal and trigger a check to ensure positioning accuracy. If any problem occurs during operation, it can be discovered in time for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 is a top view of the first embodiment of the utility model;

[0021] Figure 2 The first embodiment of the utility model Figure 1 A partial enlarged view of A;

[0022] Figure 3 It is a front view of the first embodiment of the utility model;

[0023] Figure 4 The first embodiment of the utility model Figure 3 A partial enlarged view of B.

[0024] Among them, the reference numerals of the figures are:

[0025] 1. Frame; 2. Arm; 3. Drive unit; 4. Rack; 5. Rotating shaft; 6. Absolute encoder; 7. Proximity switch; 8. Sensor plate; 9. Bracket; 91. Base; 911. Bottom plate; 912. Rectangular frame; 913. Reinforcement ribs; 92. Guide rail; 921. T-slot; 93. Mounting plate. DETAILED DESCRIPTION

[0026] 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.

[0027] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0028] Reference Figures 1 to 4 As shown, in one embodiment of the utility model, a gantry crane luffing mechanism includes a frame 1 and a boom 2, one end of the boom 2 is hinged on the frame 1, and a driving unit 3, a gear (not shown in the figure) and a rack 4 are provided on the frame 1, the rack 4 is slidably matched with the frame 1, one end of the rack 4 is hinged with the boom 2, the gear cooperates with the rack 4, the driving unit 3 drives the gear to rotate, the gear drives the rack 4 to move, the rack 4 moves and drives the boom 2 to swing, and the angle of the boom 2 is adjusted; the driving unit 3 includes a motor and a gear box, the electrode is connected to the gear box, and the output shaft of the gear box is connected to the gear;

[0029] A rotating shaft 5 is provided on the gear, and the rotating shaft 5 is coaxial with the gear. The rotating shaft 5 can also be an integrated structure with the output shaft of the gear box. An absolute encoder 6 is connected to the end of the rotating shaft 5 away from the gear. The absolute encoder 6 detects the number of rotations of the gear, and enters the calculation to obtain the moving distance of the rack 4. Knowing the position information of the rack 4, according to the corresponding relationship between the rack 4 and the arm 2 angle, the comparison angle can be calculated;

[0030] A proximity switch 7 is provided on the arm 2, and a sensing plate 8 is fixed on the frame 1;

[0031] When the arm 2 swings to the preset angle, the proximity switch 7 cooperates with the sensor plate 8, and the proximity switch 7 will receive a signal. At this time, a check can be performed to determine whether the angle of the arm 2 calculated based on the data of the absolute encoder 6 is the preset angle. Each time the arm 2 swings to the preset angle, the proximity switch 7 will receive a signal and trigger a check to ensure positioning accuracy. During the operation, if any problem occurs, it can be discovered in time for maintenance.

[0032] In this embodiment, a first direction is also included, and the first direction is parallel to the rotation axis of the boom 2. The proximity switch 7 is located at one end of the boom 2 along the first direction, and the proximity switch 7 is located at one end of the boom 2 close to the frame 1. In this way, the position of the sensor plate 8 will not interfere with the swing range of the boom 2. The positions of the proximity switch 7 and the sensor plate 8 are both close to the driver's cab for easy installation.

[0033] In this embodiment, a bracket 9 is provided on the arm 2, and a proximity switch 7 is arranged on the bracket 9. The position of the proximity switch 7 on the bracket 9 is adjustable to adjust the distance between the proximity switch 7 and the induction plate 8.

[0034] Based on this, after installing the proximity switch 7, the proximity switch 7 can be fine-tuned according to the actual position of the sensor plate 8 to ensure that the distance between the proximity switch 7 and the sensor plate 8 is appropriate; even after replacing different types of proximity switches 7, the position of the proximity switch 7 can also be adjusted.

[0035] Specifically, the bracket 9 includes a base 91 fixed on the arm 2, a guide rail 92 is provided on the base 91, a T-shaped slot 921 is provided on the guide rail 92, and the T-shaped slot 921 extends along the first direction;

[0036] It also includes a mounting plate 93, on which bolts are provided, and the bolts cooperate with T-slots 921 to fix the mounting plate 93 on the guide rail 92. The structure of the guide rail 92 plus the T-slot 921 is similar to that of an aluminum profile, so the mounting plate 93 can be fixed to the guide rail 92 by means of bolts. When the bolts are loosened, the mounting plate 93 can be moved to adjust the distance between the mounting plate 93 and the sensing plate 8; the proximity switch 7 is fixed on the mounting plate 93, so by adjusting the distance between the mounting plate 93 and the sensing plate 8, the distance between the proximity switch 7 and the sensing plate 8 can be adjusted.

[0037] At the same time, the arrangement of the T-slot 921 facilitates the fixing of the cable. The cable of the proximity switch 7 can be fitted on the T-slot 921 and fixed with a cable tie, so that the cable is not easily pulled.

[0038] In this embodiment, a groove is provided on the base 91, which is compatible with the end of the guide rail 92 along one end of the first direction. The guide rail 92 is inserted in the groove and is detachably connected to the base 91. Different types of guide rails 92 can be replaced according to actual needs to ensure that the proximity switch 7 can be used normally.

[0039] Specifically, the base 91 includes a bottom plate 911 and a rectangular frame 912 fixed on the bottom plate 911. The rectangular frame 912 forms a groove on the bottom plate 911. A reinforcing rib 913 is provided between the outer wall of the rectangular frame 912 and the bottom plate 911. The base 91 is constructed by using the rectangular frame 912, the bottom plate 911, etc. The base 91 does not need to be very thick to machine the groove, which makes it convenient to fix the base 91 to the arm 2. The reinforcing rib 913 is used to ensure the strength of the rectangular frame 912, ensuring that the rectangular frame 912 can support the guide rail 92.

[0040] Preferably, the depth of the groove is 0.3 to 0.5 times the length of the guide rail 92, ensuring that the guide rail 92 has a sufficient length to be located in the groove, the guide rail 92 will not tilt, and the position of the proximity switch 7 will not change.

[0041] 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 door crane luffing mechanism, characterized in that: It comprises a frame and an arm, one end of the arm is hinged on the frame, a driving unit, a gear and a rack are arranged on the frame, the rack is slidably matched with the frame, one end of the rack is hinged with the arm, the gear is matched with the rack, and the driving unit drives the gear to rotate; The gear is provided with a rotating shaft, the rotating shaft is coaxial with the gear, and an absolute value encoder is connected to one end of the rotating shaft away from the gear; The arm is provided with a proximity switch, and the frame is fixed with a sensing plate. When the arm is swung to a preset angle, the proximity switch cooperates with the sensing plate.

2. The door crane luffing mechanism according to claim 1, characterized in that: It also includes a first direction, which is parallel to the rotation axis of the arm, and the proximity switch is located at one end of the arm along the first direction.

3. The door crane luffing mechanism according to claim 2, characterized in that: The proximity switch is located at one end of the arm close to the frame.

4. The door crane luffing mechanism according to claim 2, characterized in that: The arm support is provided with a bracket, the proximity switch is arranged on the bracket, and the position of the proximity switch on the bracket is adjustable to adjust the distance between the proximity switch and the sensing plate.

5. The door crane luffing mechanism according to claim 4, characterized in that: The bracket comprises a base fixed on the arm, the base is provided with a guide rail, the guide rail is provided with a T-shaped slot, and the T-shaped slot extends along the first direction; It also includes a mounting plate, on which bolts are provided. The bolts cooperate with the T-slots to fix the mounting plate on the guide rail, and the proximity switch is fixed on the mounting plate.

6. The door crane luffing mechanism according to claim 5, characterized in that: The base is provided with a groove matched with the end of one end of the guide rail along the first direction, and the guide rail is inserted in the groove and detachably connected to the base.

7. The door crane luffing mechanism according to claim 6, characterized in that: The base comprises a bottom plate and a rectangular frame fixed on the bottom plate, wherein the rectangular frame surrounds the groove on the bottom plate, and reinforcing ribs are arranged between the outer wall of the rectangular frame and the bottom plate.

8. The door crane luffing mechanism according to claim 6, characterized in that: The depth of the groove is 0.3 to 0.5 times the length of the guide rail.

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