Hoist ratio recognition device, method and crane

Abstract

This invention discloses a winch ratio identification device, method, and crane. The winch ratio identification device includes: a rope end detection module for detecting the fixed position of the rope loop; a motor pressure detection module for detecting the motor pressure value; a lifting weight detection module for detecting the lifting weight value; and a ratio calculation module for identifying the winch ratio using a preset algorithm based on the position detected by the rope end detection module, the motor pressure value detected by the motor pressure detection module, and the lifting weight value detected by the lifting weight detection module. This invention offers higher reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to crane technology, in particular to a hoist ratio recognition device, method and crane. BACKGROUND

[0002] Crane is equipped with a force limiter device to prevent overloading operation that may exist when the crane is working, and a key indicator needed to determine whether the crane is overloaded is the steel wire rope ratio. The steel wire rope ratio refers to the ratio of the number of steel wire rope branches passing through the pulley block to the number of steel wire ropes introduced into the hoist. The steel wire rope ratio is divided into odd and even numbers, as shown in the figure, if the steel wire rope is connected at Q1 of the boom fixed pulley block 1, it is an even ratio, and if it is connected at Q2 of the hoist hook movable pulley block 2, it is an odd ratio. During operation, the ratio can be reasonably selected according to the site lifting weight. If the operator forgets to reset the correct ratio after changing the actual ratio of the hoist, it will cause the force limiter system to misjudge, and there is a certain risk when lifting operation is carried out. Lightly, it affects the construction efficiency, and heavily, it causes safety accidents. Figure 1

[0003] The document with publication number CN103935896A discloses a kind of hoisting machinery steel wire rope ratio automatic recognition device and identification method, in this patent, steel wire rope ratio detection device detects whether there is fixed connection steel wire rope on the fixed pulley block through its first sensor, and the number of times n that steel wire rope passes through the fixed pulley block is measured by second sensor;When the fixed pulley block has fixed connection steel wire rope on the fixed pulley block fixed point, the steel wire rope ratio detection device generates the electric signal of steel wire rope ratio 2×(n+1), when the fixed pulley block does not have fixed connection steel wire rope on the fixed pulley block fixed point, the steel wire rope ratio detection device generates the electric signal of steel wire rope ratio 2×n+1.The technology in this patent corresponds to a proximity switch for each fixed pulley, and the steel wire rope ratio is calculated by detecting whether there is steel wire rope in the fixed pulley through the proximity switch. However, when one of the proximity switches is damaged, the steel wire rope ratio judgment will fail, and the reliability is poor. SUMMARY

[0004] The present application provides a kind of hoist ratio recognition device, method and crane with higher reliability for the problems existing in the prior art.

[0005] Technical scheme: the hoist ratio recognition device provided by the present application comprises:

[0006] A rope head detection module is used to detect the fixed position of the rope sleeve.

[0007] A motor pressure detection module is used to detect the motor pressure value.

[0008] A load weight detection module is used to detect the load weight value.

[0009] ​The ratio calculation module is configured to identify the hoisting ratio by using a preset algorithm according to the position detected by the rope end detection module, the motor pressure value detected by the motor pressure detection module and the hoisting weight value detected by the hoisting weight detection module.

[0010] Further, the preset algorithm is specifically:

[0011] If the indication signal sent by the rope end detection module is not received, it is determined that the fixed position of the rope sleeve is the hook movable pulley block, and the hoisting ratio n is respectively taken as an odd value of 1, 3, 5, … to calculate the value of the following formula; if the indication signal sent by the rope end detection module is received, it is determined that the fixed position of the rope sleeve is the hook movable pulley block, and the hoisting ratio n is respectively taken as an even value of 2, 4, 6, … to calculate the value of the following formula.

[0012] Pn=(2π×N / n×9.8×[(D+6d) / 2] / (i×η1×η2)) / (q / η3)

[0013] In the formula, Pn is the calculated motor pressure value, N is the hoisting weight value detected by the hoisting weight detection module, D is the drum diameter, d is the steel wire rope diameter, i is the speed ratio of the speed reducer, q is the motor displacement, η1 is the motor mechanical efficiency, η2 is the mechanical efficiency of the speed reducer, and η3 is the volumetric efficiency of the motor.

[0014] The absolute difference |Pn-P| is calculated between the calculated motor pressure value Pn and the motor pressure value P detected by the motor pressure detection module.

[0015] The hoisting ratio n corresponding to the minimum value of |Pn-P| is identified as the identified hoisting ratio.

[0016] Further, the rope end detection module is specifically a proximity switch / sensor installed at the rope hanging connection of the hook movable pulley block, and when the hook movable pulley block is fixed with the rope sleeve, the proximity switch / sensor sends an indication signal to the ratio calculation module. The motor pressure detection module is specifically a pressure sensor installed on the hoisting motor. The hoisting weight detection module is specifically a pressure sensor installed in the large cavity of the luffing oil cylinder.

[0017] The hoisting ratio identification method disclosed by the application comprises:

[0018] detecting the fixed position of the rope sleeve;

[0019] detecting the motor pressure value;

[0020] detecting the hoisting weight value;

[0021] identifying the hoisting ratio by using a preset algorithm according to the detected fixed position of the rope sleeve, the motor pressure value and the hoisting weight value.

[0022] Further, the preset algorithm is specifically:

[0023] If the indication signal sent by the rope end detection module is not received, it is determined that the fixed position of the rope sleeve is the hook movable pulley block, and the value of the following formula is calculated by taking the hoisting ratio n as an odd value of 1, 3, 5, …; if the indication signal sent by the rope end detection module is received, it is determined that the fixed position of the rope sleeve is the hook movable pulley block, and the value of the following formula is calculated by taking the hoisting ratio n as an even value of 2, 4, 6, …;

[0024] Pn=(2π×N / n×9.8×[(D+6d) / 2] / (i×η1×η2)) / (q / η3)

[0025] In the formula, Pn is the calculated motor pressure value, N is the hoisting weight value detected by the hoisting weight detection module, D is the drum diameter; d is the steel wire rope diameter, i is the speed ratio of the speed reducer, q is the motor displacement, η1 is the motor mechanical efficiency, η2 is the mechanical efficiency of the speed reducer, and η3 is the volumetric efficiency of the motor;

[0026] The absolute difference |Pn-P| is calculated by taking the calculated motor pressure value Pn and the motor pressure value P detected by the motor pressure detection module as the absolute difference |Pn-P|;

[0027] The hoisting ratio n corresponding to the minimum value of |Pn-P| is recognized as the hoisting ratio.

[0028] The crane provided by the present application has the hoisting ratio recognition device.

[0029] Advantages: Compared with the prior art, the present application has the following advantages: the present application can automatically and quickly determine the hoisting ratio, and has high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of a crane fixed and movable pulley block;

[0031] Figure 2 is a module schematic diagram of the hoisting ratio recognition device provided by the present application;

[0032] Figure 3 is Figure 1 is an enlarged schematic diagram of A in DETAILED DESCRIPTION

[0033] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0034] Embodiment one

[0035] The present embodiment provides a hoisting ratio recognition device, as shown in Figure 2As shown, the device includes a rope end detection module for detecting the fixed position of the rope sleeve, a motor pressure detection module for detecting the motor pressure value, a load weight detection module for detecting the load weight value, and a ratio calculation module for identifying the hoisting ratio. The ratio calculation module specifically identifies the hoisting ratio according to the position detected by the rope end detection module, the motor pressure value detected by the motor pressure detection module, and the load weight value detected by the load weight detection module using a preset algorithm. The rope end detection module is specifically a proximity switch / sensor installed at the rope hanging position of the fixed pulley block of the boom (A as shown) Figure 3 When the rope sleeve is fixed on the fixed pulley block of the boom, the proximity switch / sensor sends an indication signal to the ratio calculation module, indicating that the hoisting ratio is even at this time. If no indication signal is sent, the rope sleeve is fixed on the movable pulley block of the hook, indicating that the hoisting ratio is odd at this time. The motor pressure detection module is specifically a pressure sensor installed on the hoisting motor. The load weight detection module is specifically a pressure sensor installed in the large cavity of the luffing cylinder, and the load weight value can be calculated according to the pressure.

[0036] The preset algorithm of the ratio calculation module is specifically as follows:

[0037] A. If no indication signal is received from the rope end detection module, it is determined that the fixed position of the rope sleeve is the movable pulley block of the hook, and the hoisting ratio n is taken as 1, 3, 5, …, and the value of the following formula is calculated; if an indication signal is received from the rope end detection module, it is determined that the fixed position of the rope sleeve is the fixed pulley block of the boom, and the hoisting ratio n is taken as 2, 4, 6, …, and the value of the following formula is calculated;

[0038] Pn=(2π×N / n×9.8×[(D+6d) / 2] / (i×η1×η2)) / (q / η3)

[0039] In the formula, Pn is the calculated motor pressure value, N is the load weight value detected by the load weight detection module, D is the drum diameter; d is the steel wire rope diameter, i is the speed ratio of the speed reducer, q is the motor displacement, η1 is the mechanical efficiency of the motor, η2 is the mechanical efficiency of the speed reducer, and η3 is the volumetric efficiency of the motor;

[0040] B. Calculate the absolute difference |Pn-P| between the calculated motor pressure value Pn and the motor pressure value P detected by the motor pressure detection module;

[0041] C. The hoisting ratio n corresponding to the minimum value of |Pn-P| is the identified hoisting ratio.

[0042] The value range of the hoisting ratio n is 1 to the maximum hoisting ratio that the crane can achieve.

[0043] Embodiment Two

[0044] The embodiment provides a hoisting ratio recognition method, comprising the following steps:

[0045] S1, detecting the fixed position of the rope sleeve;

[0046] S2, detecting the motor pressure value;

[0047] S3, detecting the hoisting weight value;

[0048] S4, recognizing the hoisting ratio according to the detected fixed position of the rope sleeve, the motor pressure value and the hoisting weight value by using a preset algorithm. The preset algorithm is specifically as follows:

[0049] A, if the indication signal sent by the rope head detection module is not received, it is determined that the fixed position of the rope sleeve is the hook movable pulley block, the hoisting ratio n is respectively taken as odd values 1, 3, 5, …, and the value of the following formula is calculated; if the indication signal sent by the rope head detection module is received, it is determined that the fixed position of the rope sleeve is the hook movable pulley block, the hoisting ratio n is respectively taken as even values 2, 4, 6, …, and the value of the following formula is calculated;

[0050] Pn=(2π×N / n×9.8×[(D+6d) / 2] / (i×η1×η2)) / (q / η3)

[0051] In the formula, Pn is the calculated motor pressure value, N is the hoisting weight value detected by the hoisting weight detection module, D is the drum diameter; d is the steel wire rope diameter, i is the speed ratio of the speed reducer, q is the motor displacement, η1 is the motor mechanical efficiency, η2 is the mechanical efficiency of the speed reducer, and η3 is the motor volumetric efficiency;

[0052] B, calculating the absolute difference |Pn-P| of the calculated motor pressure value Pn and the motor pressure value P detected by the motor pressure detection module;

[0053] C, obtaining the hoisting ratio n corresponding to the minimum value of |Pn-P| as the recognized hoisting ratio.

[0054] The embodiment corresponds to the embodiment one to one, and details are referred to the embodiment one, and will not be described herein.

[0055] Embodiment three

[0056] The embodiment provides a crane, which has the hoisting ratio recognition device of the above embodiment one, can automatically and quickly determine the hoisting ratio, and is high in reliability.

[0057] The above only discloses preferred embodiments of the application, and cannot be used to limit the scope of the application. Therefore, equivalent changes made according to the claims of the application still fall within the scope of the application.

Claims

1. A hoisting ratio identification device, characterized in that... include: Rope end detection module, used to detect the fixed position of the rope loop; Motor pressure detection module, used to detect motor pressure values; The lifting weight detection module is used to detect the lifting weight value; The winch ratio calculation module is used to identify the winch ratio based on the position detected by the rope end detection module, the motor pressure value detected by the motor pressure detection module, and the lifting weight value detected by the lifting weight detection module, using a preset algorithm. The preset algorithm is specifically as follows: If no indication signal is received from the rope end detection module, the fixed position of the rope loop is determined to be the moving pulley block of the hook, and the value of the following formula is calculated by taking odd values ​​of the winch ratio n, which are 1, 3, 5, ... respectively; if an indication signal is received from the rope end detection module, the fixed position of the rope loop is determined to be the fixed pulley block of the boom, and the value of the following formula is calculated by taking even values ​​of the winch ratio n, which are 2, 4, 6, ... respectively. Pn=(2π×N / n×9.8×[(D+6d) / 2] / (i×η1×η2)) / (q / η3) In the formula, Pn is the calculated motor pressure value, N is the lifting weight value detected by the lifting weight detection module, D is the drum diameter; d is the wire rope diameter, i is the speed ratio of the reducer, q is the motor displacement, η1 is the motor mechanical efficiency, η2 is the reducer mechanical efficiency, and η3 is the motor volumetric efficiency. The absolute difference |Pn-P| is calculated between the calculated motor pressure values ​​Pn and the motor pressure values ​​P detected by the motor pressure detection module. The minimum value of |Pn-P| corresponds to the hoisting ratio n, which is the identified hoisting ratio.

2. The hoisting ratio identification device according to claim 1, characterized in that: The rope end detection module is specifically a proximity switch / sensor installed at the rope attachment point of the boom pulley block. When a rope loop is fixed on the boom pulley block, the proximity switch / sensor sends an indication signal to the ratio calculation module.

3. The hoisting ratio identification device according to claim 1, characterized in that: The motor pressure detection module is specifically a pressure sensor installed on the hoist motor.

4. The hoisting ratio identification device according to claim 1, characterized in that: The lifting weight detection module is specifically a pressure sensor installed inside the large cavity of the luffing cylinder.

5. A method for identifying hoisting ratio, characterized in that... include: Check the fixed position of the rope loop; Detect motor pressure value; Detect the weight of the crane; The winch ratio is identified using a preset algorithm based on the fixed position of the rope loop, the motor pressure value, and the suspended weight value. The preset algorithm is specifically as follows: If no indication signal is received from the rope end detection module, the fixed position of the rope loop is determined to be the moving pulley block of the hook, and the value of the following formula is calculated by taking odd values ​​of the winch ratio n, which are 1, 3, 5, ... respectively; if an indication signal is received from the rope end detection module, the fixed position of the rope loop is determined to be the fixed pulley block of the boom, and the value of the following formula is calculated by taking even values ​​of the winch ratio n, which are 2, 4, 6, ... respectively. Pn=(2π×N / n×9.8×[(D+6d) / 2] / (i×η1×η2)) / (q / η3) In the formula, Pn is the calculated motor pressure value, N is the lifting weight value detected by the lifting weight detection module, D is the drum diameter; d is the wire rope diameter, i is the speed ratio of the reducer, q is the motor displacement, η1 is the motor mechanical efficiency, η2 is the reducer mechanical efficiency, and η3 is the motor volumetric efficiency. The absolute difference |Pn-P| is calculated between the calculated motor pressure values ​​Pn and the motor pressure values ​​P detected by the motor pressure detection module. The minimum value of |Pn-P| corresponds to the hoisting ratio n, which is the identified hoisting ratio.

6. A crane, characterized in that: The device comprises the winch ratio identification device according to any one of claims 1 to 4.

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