RU2426077C1 - Device for load weighing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: devise consists of cross bar of crane, of load transporting mechanism, of weight measuring unit with power measuring strain sensors of weight loads, of converting unit electrically connected with power measuring strain sensors and of light display of weight loads readings. Also, the device has two weight measuring units and a beam connecting them. Each weight measuring unit consists of the strain sensor whereto brackets are connected from above and beneath. In the brackets there are inserted rings and a lower ring is set on an axle of a hoisting unit of the crane cross bar, while an upper ring is set on axle of the device beam. A secondary converter connected with LED display reflecting values of a current load is arranged on the device beam.

EFFECT: increased reliability of device operation, upgraded accuracy of measurement and simplified deign of device.

5 cl, 4 dwg

Description

The present invention relates to the field of weighing equipment and can be used for weighing goods transported by lifting and handling mechanisms, in metallurgy, mechanical engineering and other industries.

A device for weighing cargo is known, comprising a cargo transport mechanism, load cell weight sensors mounted on a cargo transport mechanism, an amplification-conversion unit electrically connected to the sensors, and a light display of weight loads ("Crane scales with a digital electronic display KGW1 ... 100". ENP Steuerungs- und Wagetechnik Gmbh. Technical description N 3/94/4000/500).

Devices for weighing cargo of this type are equipped with a radio channel for transmitting information at a distance of up to 1000 m to a personal computer.

The disadvantages of this device are the lack of reliability of the scales, because the reliability of the balance is based on the reliability of the load cell and its measuring channel, and the failure of the sensor leads to a failure of the entire device.

A device for weighing a homogeneous material (EP 1698872 IPC ⁸ G01G 21/24, published on September 6, 2006) with a plurality of weighing modules with traverses, the longitudinal axes of which extend in the direction of the load supply is known. Each traverse has a system of gear levers and rods for communication with the corresponding weighing module. In this case, the weighing modules are located at several levels.

The disadvantage of this device is the lack of reliability due to the complexity of the device.

Known crane or similar transportation device with a measuring system (EP 1806311 IPC ⁸ V66C 13/22, published. 07/11/2007). The crane contains a trolley mounted on it a transceiver that transmits a basic signal and receives a signal from a pulse transceiver, a device for weighing cargo. The pulse transceiver is mounted opposite the crane in a specific place. The crane also contains a device for determining the moment acting on the crane.

The disadvantage of this device is the lack of reliability due to the complexity of the device.

The closest technical solution is a device for weighing cargo (patent RU No. 2119648, IPC ⁶ G01G 19/14, B66C 13/16, publ. 09/27/1998).

The device contains load cell load sensors mounted on a cargo transport mechanism, an amplification-conversion unit electrically connected to the sensors, and a light display panel for displaying weight loads. The device is equipped with temperature sensors mounted in load cells, and a shielding casing, in which an amplifier-converter block is installed with a gap, made in the form of a programmable controller with a summing device. A fan is located in the casing, and in the controller there is a heater and thermal resistance, electrically connected to the heater and fan. The controller is electrically connected with each temperature sensor and with each load sensor independently.

The disadvantage of this device is that long materials on it are difficult to weigh and move, which leads to inaccurate results.

The problem solved by the invention is to increase the reliability of the device for weighing goods, increasing the accuracy of measurement and simplifying the design of the device.

The problem is solved using a device for weighing goods, including a crane beam, a cargo transport mechanism, a weighing unit with load cell load cells, a conversion unit electrically connected to load cell load cells, and a light panel displaying the load.

The device has two weighing units and a beam connecting them, each of the load measuring units consists of a load cell, to which are attached the brackets into which the rings are inserted, the lower ring is mounted on the axis of the lifting block of the crane beam, the upper ring is mounted on the axis of the device beam, a secondary converter is connected to the device beam, connected with an LED display to display the current weight value.

Preferably, the ratio of the height between the upper and lower rings of the weighing unit to the diameter of the axis of the crane yoke is 4.0-8.0.

The device preferably includes a remote control.

Preferably, the crane beam and the device beam have additional reinforcement on both sides in the form of an equilateral triangle, the apex of which is located above the beam.

Preferably, the axis of the beam of the device has a diameter equal to the diameter of the axis of the yoke of the crane.

Figure 1 presents a General view of the device for weighing cargo.

Figure 2 presents a front view of the device.

Figure 3 presents a section along aa.

Figure 4 presents the load measuring unit 3.

The device comprises a cargo transport mechanism with a traverse 1, a beam 2 with an axis, two weight measuring units 3, a secondary converter unit 4 with an LED display 5, lifting blocks 6.

The load-measuring unit 3 consists of a load cell 7 located in the casing 8 and closed by a cover 9. To the load cell 7 are attached above and below the brackets 10 into which the rings 11 are inserted, the lower ring 11 is mounted on the axis 12 of the lifting block 6 of the crosshead 1 of the crane. The upper ring 11 is mounted on the axis 13 on the beam 2 of the device connecting the two weighing nodes 3, on the beam 2 of the device there is a secondary converter 4 connected to the LED display 5 to display the value of the current weight.

The device is intended for weighing loads lifted by means of traverses of cranes. The device is manufactured for a specific crosshead with the calculation of installing it between the metal structures of the initial crosshead of the crane and the lifting cables of the crane. When installing the device on the crane, the lifting blocks 6 of the initial crosshead are disassembled from the axes and installed on the device for weighing cargo on an axis of similar dimensions. The load-sensing element of the device is a load-measuring unit 3, which may have a nominal load capacity, for example, 1.2, 5, 10, 20, 40, 50 tons. The weighing unit 3 preferably includes: one LD load cell manufactured by ENP Wagetechnik GmbH, Germany of the corresponding load capacity, two lifting brackets 10 type CA according to the standard RR-C-271D (USA) of the corresponding carrying capacity, two lifting rings 11 class T8 type OB no DIN5688 corresponding carrying capacity. As the strain gauges can be used any known from the prior art, for example strain gauge sensors.

Depending on the load capacity of the device for weighing cargo, the ratio of the height H (Figure 4) between the upper and lower rings 11 (Figure 3) of the weighing unit 3 to the diameter of the axis 12 of the crosshead 1 of the crane is 4.0-8.0 for more reliable operation of the device and more correct (accurate) weight measurement.

In figure 3, the axis 13 of the beam 2 has a diameter equal to the diameter of the axis 12 of the beam 1 of the crane. According to the invention, the axis of the beam may have a diameter different from the diameter of the axis of the beam of the crane.

Figure 4 shows the load-measuring unit, which has a diameter of the axis of the lifting block of the initial beam from 60 to 150 mm, a height (H) from 490 to 1500 mm between the upper and lower rings 11 of the load-measuring unit 3.

The lower ring 11 is installed on the axis 12 of the lifting block 6 of the original crosshead 1, the upper ring 11 is installed on the axis 13 of equal diameter on the beam 2 of the device. After installing the device, the weight of the load suspended on the cross beam 1, and the weight of the cross beam 1 is perceived by the load cells 7 of the load measuring unit 3. The beam 2 connecting the right and left load measuring units 3 is designed to maintain parallelism along the axes of both load sensors 7, which is necessary for more accurate determination of the weight. Preferably, a secondary converter 4 of type LD manufactured by ENP Wagetechnik GmbH is mounted on the device beam 2. The Converter 4 displays on the LED display 5 high brightness value of the current weight. During the initial installation of the device or, if necessary, the transducer 4 is calibrated with reference weights for the zero mass of the load and for the load equal to the maximum weighing limit of the device. The secondary Converter 4 is equipped with an IR remote control for remote control of the balance (calibration, zeroing, packaging).

The device for weighing cargoes works on the principle of direct weighing of the cargo with subsequent processing of information from two load-measuring units 3. The force generated by the weighed load is perceived by the load cells 7 included in the load-measuring nodes 3, is converted into a proportional electrical signal, digitized using a secondary converter unit 4 and is indicated on the digital display of the last, LED display 5.

The operation of the device is controlled using the remote control (RC) on infrared rays.

To increase the stability and safe operation of the device, the traverse 1 of the crane and the beam 2 of the device can additionally be strengthened on both sides in the form of an equilateral triangle, the apex of which is located above the beam 2 (not shown in the drawings).

The technical result of the invention is to increase the reliability of the device, increase the accuracy of measurement and simplify the design of the device.

The proposed device allows you to weigh long loads on existing cranes. Using the proposed device can be organized a system of automated accounting of transported cargo. The proposed device is easily connected to existing cargo traverses of cranes and allows you to organize weighing without replacing the processing equipment. Installing the device on a crane takes little time. The modular design of the device for weighing goods allows their installation on many types of cranes, while the device for weighing goods slightly lengthens the suspension. The device has autonomous cable-free power and may also have an additional radio telemetry channel for transferring weight data up to 1000 m.

Claims (5)

1. A device for weighing goods, including a crane beam, a load-transport mechanism, a weighing unit with load-measuring load cells, a conversion unit electrically connected to load-measuring load cells, and a light display displaying the load, characterized in that the device has two load-measuring nodes and a beam connecting them, each of the load-measuring nodes consists of a load cell, to which are attached the brackets into which the rings are inserted above and below, the lower ring о installed on the axis of the lifting block of the crane beam, the upper ring is installed on the axis of the device beam, a secondary converter is installed on the device beam, connected to the LED display panel to display the current weight value. 2. The device for weighing goods according to claim 1, characterized in that the ratio of the height between the upper and lower rings of the weighing unit to the diameter of the axis of the crane yoke is 4.0-8.0. 3. The device for weighing goods according to claim 1, characterized in that it contains a remote control. 4. The device for weighing goods according to claim 1, characterized in that the crosshead of the crane and the beam of the device have additional reinforcement on both sides in the form of an equilateral triangle, the apex of which is located above the beam. 5. A device for weighing goods according to any one of claims 1 to 4, characterized in that the axis of the beam has a diameter equal to the diameter of the axis of the crane yoke.

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