Hoisting point position measuring system of hoisting mechanism

Abstract

The utility model discloses a lifting point position measuring system of a lifting mechanism. The lifting point position measuring system comprises a screw rod, a screw rod supporting seat, a linear guide rail, a measuring block and a laser range finder, the lead screw is connected with the lifting winding drum through a gear set, and when the lifting winding drum rotates, the lead screw is driven to rotate through gear transmission. The measuring block is arranged on the screw rod and can move along the linear guide rail; the laser range finder is arranged at a proper position of the screw rod supporting seat, and a light reflecting structure is arranged on the measuring block; adjusting the position to ensure that the light beam emitted by the laser range finder can be reflected back to the laser range finder; and the laser range finder is connected with the driving control system, so that measured data can be conveniently sent to the driving control system. According to the lifting point position measuring system of the lifting mechanism, the defects of an absolute value encoder are overcome, the real and accurate lifting point position can be detected in real time, the system participates in multi-lifting-point synchronous control of a crane control system in the first time, and reliable control over the lifting mechanism can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a lifting mechanism hoisting point position measurement system, and in particular to a position measurement system based on synchronous control of multiple permanent magnet direct-drive lifting mechanisms. Background Art

[0002] In the actual operation of the crane, due to the large size or heavy weight of the hoisted material, multiple lifting points are required to lift the material at the same time. In order to ensure the stable lifting of the material and prevent the overload at each lifting point, the crane control system needs to synchronously control the motors of each lifting point.

[0003] The principle of synchronous control of multiple lifting mechanism motors is as follows: To achieve synchronous control of multiple lifting mechanism motors, the existing technology is to add an absolute encoder to each lifting mechanism to detect the real-time position of the lifting mechanism. In the synchronous control state, the system takes position control as the goal to ensure that the position deviation of the lifting points of multiple lifting mechanisms is within a certain range. The system detects the absolute encoder signal in real time and judges the conditions to ensure the relative synchronization of the operation of multiple lifting mechanisms.

[0004] It can be seen from the principle of synchronous control that the control system is aimed at position control and needs to detect the real-time position of the lifting mechanism's lifting point, so the position measurement system is crucial. The prior art is to install an absolute encoder at the end of the drum, which is meshed with the drum through a coupling and gears. The drum rotates while driving the absolute encoder shaft to rotate. The absolute encoder outputs a pulse signal to the crane control system, and the position of the lifting structure's lifting point is obtained by calculation. Absolute encoders are commonly used in photoelectric and electromagnetic types. When using an electromagnetic absolute encoder for a permanent magnet direct-drive lifting mechanism, there will be a problem of interference from the permanent magnet's magnetic field, so only a photoelectric absolute encoder can be used. However, this technical solution has the following defects in actual use:

[0005] 1. The most important component inside the photoelectric absolute encoder is the optical code disk, but the material of the optical code disk is fragile, especially when used on a vibrating lifting mechanism, the absolute encoder will be easily damaged.

[0006] 2. The absolute encoder is a precision device. The encoder shaft is connected to the motor drum through a coupling and gears. The vibration of the motor and the drum will be directly transmitted to the encoder shaft, causing the encoder shaft to be disturbed by axial vibration and radial force for a long time. Eventually, the encoder shaft is prone to wear and damage, causing encoder failure. Utility Model Content

[0007] The utility model aims to provide a lifting mechanism lifting point position measurement system to solve the technical problems in the background technology.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A lifting mechanism lifting point position measurement system, comprising a screw rod, a screw rod support seat, a linear guide rail, a measuring block and a laser rangefinder;

[0010] The screw rod is connected to the lifting drum through a gear set, and when the lifting drum rotates, the screw rod is driven to rotate through the gear transmission;

[0011] The measuring block is arranged on the lead screw and can move along the linear guide rail;

[0012] The laser rangefinder is arranged at a suitable position of the screw support seat, and a reflective structure is arranged on the measuring block; the position is adjusted to ensure that the light beam emitted by the laser rangefinder can be reflected back to the laser rangefinder;

[0013] The laser rangefinder is connected to the vehicle control system to facilitate sending the measurement data to the vehicle control system.

[0014] As a further improvement of the above technical solution, the laser rangefinder and the vehicle control system exchange data via wired or wireless means; the vehicle control system converts the displacement value of the measuring block into the number of rotations of the drum through calculation, and further converts the number of rotations of the drum into the length of the wire rope, so that the position of the hanging point can be obtained.

[0015] As a further improvement of the above technical solution, the measuring block is installed on the screw through a nut. When the screw rotates, it can drive the measuring block to move on the linear guide rail, which is used to convert the number of rotations of the lifting drum into the linear displacement of the measuring block.

[0016] As a further improvement of the above technical solution, the driving control system reads the real-time position information of all hanging points, selects a certain hanging point as a reference point, and controls the rotation speed of the motors of each hanging point in real time to ensure that the relative position difference between other hanging points and the reference hanging point is within a reasonable range. In this way, the control system completes the synchronous control of all hanging points.

[0017] As a further improvement of the above technical solution, reflective paper or a reflective plate is provided on the measuring block.

[0018] The beneficial effects of the above technical solution: the utility model provides a lifting mechanism lifting point position measurement system, including a screw, a screw support seat, a linear guide rail, a measuring block and a laser rangefinder, which solves the defects of the absolute value encoder, and the equipment used is simple, has a good technical accumulation and high technical maturity; it can detect the real and accurate lifting point position in real time, and participate in the multi-lifting point synchronous control of the driving control system at the first time, and can realize reliable control of the lifting mechanism, which greatly reduces the problem of encoder failure in the existing position measurement system that makes the various lifting points unable to operate synchronously, and avoids serious personal injury and property loss to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a synchronous control system provided by the prior art;

[0021] Figure 2 A schematic diagram of a synchronous control system provided in Example 1 of the utility model;

[0022] Figure 3 This is a schematic diagram of equipment connection of the measurement system of Example 1 of the utility model;

[0023] Figure 4 This is a front view of the measurement system of Example 1 of the utility model;

[0024] Figure 5 A top view of the measurement system of Embodiment 1 of the present utility model;

[0025] Figure 6 This is a three-dimensional diagram of the measurement system of Example 1 of the utility model;

[0026] In the figure, 1-screw; 2-screw support seat; 3-linear guide; 4-measuring block; 401-reflective paper; 5-laser rangefinder; 6-gear set; 7-lifting drum. DETAILED DESCRIPTION

[0027] Example 1

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments.

[0029] like Figures 1 to 6As shown, a lifting mechanism lifting point position measurement system includes a screw 1, a screw support seat 2, a linear guide rail 3, a measuring block 4 and a laser rangefinder 5;

[0030] The screw rod 1 is connected to the lifting drum 7 through the gear set 6. When the lifting drum 7 rotates, the screw rod 1 is driven to rotate through the gear transmission;

[0031] The measuring block 4 is arranged on the screw rod 1 and can move along the linear guide rail 3;

[0032] The laser rangefinder 5 is set at a suitable position of the screw support seat 2, and a reflective paper 401 is provided on the measuring block 4; the position is adjusted to ensure that the light beam emitted by the laser rangefinder 5 can be reflected back to the laser rangefinder 5;

[0033] The laser rangefinder 5 is connected to the vehicle control system to facilitate sending the measurement data to the vehicle control system.

[0034] In this embodiment, the laser rangefinder and the vehicle control system exchange data wirelessly; the vehicle control system converts the displacement value of the measuring block into the number of turns of the drum by calculation, and further converts the number of turns of the drum into the length of the wire rope, so that the position of the suspension point can be obtained. More specifically, the laser rangefinder and the vehicle control system use a 5G communication module for wireless communication.

[0035] In this embodiment, the measuring block 4 is mounted on the screw 1 through a nut. When the screw 1 rotates, it can drive the measuring block 4 to move on the linear guide rail 3, which is used to convert the number of rotations of the lifting drum 7 into the linear displacement of the measuring block 4.

[0036] In this embodiment, the driving control system reads the real-time position information of all hanging points, selects a certain hanging point as a reference point, and controls the rotation speed of the motors of each hanging point in real time to ensure that the relative position difference between other hanging points and the reference hanging point is within a reasonable range. In this way, the control system completes the synchronous control of all hanging points.

[0037] In this embodiment, the lifting mechanism lifting point position measurement system does not involve specific algorithms and circuit diagrams, which are conventional technologies in the field and will not be described again.

[0038] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes 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 apparatus.

[0039] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention.

[0040] The above are only preferred implementations of the utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should all be regarded as protection of the utility model.

Claims

1. A lifting mechanism lifting point position measurement system, characterized in that: It includes a lead screw, a lead screw support seat, a linear guide rail, a measuring block and a laser rangefinder; The screw rod is connected to the lifting drum through a gear set, and when the lifting drum rotates, the screw rod is driven to rotate through the gear transmission; The measuring block is arranged on the lead screw and can move along the linear guide rail; The laser rangefinder is arranged at a suitable position of the screw support seat, and a reflective structure is arranged on the measuring block; the position is adjusted to ensure that the light beam emitted by the laser rangefinder can be reflected back to the laser rangefinder; The laser rangefinder is connected to the vehicle control system to facilitate sending the measurement data to the vehicle control system.

2. The lifting mechanism lifting point position measurement system according to claim 1, characterized in that: The laser rangefinder and the vehicle control system exchange data via wired or wireless means.

3. The lifting mechanism lifting point position measurement system according to claim 1, characterized in that: The measuring block is mounted on the screw rod through a nut, and when the screw rod rotates, the measuring block can be driven to move on the linear guide rail.

4. The lifting mechanism lifting point position measurement system according to claim 1, characterized in that: The driving control system reads the real-time position information of all the hanging points, selects a certain hanging point as a reference point, and controls the rotation speed of the motors of each hanging point in real time.

5. The lifting mechanism lifting point position measurement system according to claim 1, characterized in that: The measuring block is provided with reflective paper or reflective plate.

Images