CN203199947U - Forklift weighing device - Google Patents

Abstract

A forklift weighing device relates to a weighing device. Provided is a forklift weighing device with high weighing accuracy, large weighing capacity, simple structure, easy installation and convenient operation. It is equipped with a front hanging plate, 2 shear beam load cells, a rear hang plate, a processor and a display; the front hang plate is connected to the external forklift hang On the front hanging plate, the other ends of the two shear beam load cells extend into the installation grooves in the thickness direction of the rear hanging plate. There are two sets of force transmission components in the installation grooves, and each set of force transmission components has a The upper indenter, the lower indenter and the self-aligning ball, the upper indenter is fixed on the top wall of the installation groove, the lower indenter is fixedly connected with the other end of the shear beam load cell, and the self-aligning ball is arranged between the upper indenter and the lower indenter. Between the indenters, the rear hanging plate is connected to the external fork, the processor is connected to the two shear beam load cells with electric signals, and the display is connected to the processor with electric signals. The processor and display are located on the external forklift body superior.

Description

Forklift weighing device

technical field

The utility model relates to a weighing device, in particular to a forklift weighing device used for a forklift.

Background technique

Forklifts are a kind of lifting and transportation equipment for short-distance cargo handling and warehousing in stations, docks and large and medium-sized enterprises, and their use is extremely common. The current forklift is only used as a transportation tool in most occasions, and the goods it carries need to be transported to the weighing place in the ground for secondary weighing. The operation efficiency of this method is very low, and a lot of manpower and material resources are wasted. Most of the existing forklift weighing devices only realize weighing on a single forklift. In addition, the working environment of the forklift is harsh, so the accuracy and service life of the forklift cannot be guaranteed. With the improvement of the economic strength of the enterprise and the urgent need for work efficiency, the requirements for the weighing device of the forklift are getting higher and higher.

Chinese patent 201120114869.0 provides a weighing and measuring device for a forklift. The device includes a pressure sensor, a display and a processor. The probe tube of the pressure sensor is connected with the hydraulic pipeline of the forklift to the hydraulic lifting system, and the output electrical signal is amplified and input to the processor, and the processor has a built-in memory for storing the quality data of each heavy object lifted by the forklift. Objects can still be displayed on the monitor afterwards. The device needs to install a pressure sensor on the inner wall of the hydraulic cylinder or the oil circuit. Through dynamic analysis and establishment of a mathematical model, the dynamic model between the oil pressure and the load is obtained, and the load weight is calculated. However, this device requires a very good sealing of the oil circuit of the forklift, and the signal of the oil cylinder is usually unstable, which causes a large error in measuring the weight and load.

Chinese patent 200720113338.3 provides a forklift weighing system. The forklift weighing system includes a front panel, a rear panel, a sensor, a junction box and a display instrument. The sensor is installed between the front panel and the rear panel, and the display instrument is connected with an angle fixer. The front plate and the rear plate are connected by elastic columns, and the sensor adopts a pressure sensor or a pull sensor. When subjected to an eccentric load or the load position is different from front to back, the four compensation mechanisms can bear the randomly changing bending moment during weighing by tension or compression, ensuring that the force applied to the sensor is always vertically downward. Due to the adoption of this mechanism, the weighing accuracy is ideal, the error is generally below 0.2%, and the price is relatively low. However, the added transition hanger increases the system's loss of load distance, and the compensation mechanism needs to be adjusted and corrected after it has been used for a period of time.

Contents of the invention

The purpose of the utility model is to provide a forklift weighing device with high weighing precision, large weighing capacity, simple structure, easy installation and convenient operation.

The utility model is provided with a front hanging board, two shear beam type weighing sensors, a rear hanging board, a processor and a display; the front hanging board is connected with an external forklift hanging board, and two shear beam type weighing sensors One end is fixed on the front hanging plate, and the other ends of the two shear beam load cells are inserted into the installation groove in the thickness direction of the rear hanging plate. There are two sets of force transmission components in the installation groove, and each set of force transmission components The assembly is equipped with upper pressure head, lower pressure head and self-aligning ball. Between the head and the lower pressure head, the rear hanging plate is connected to the external fork, the processor is connected to the two shear beam load cells with equal electrical signals, the display is connected to the processor with electrical signals, and the processor and display are located outside on the body of the forklift.

Preferably, the front hanging plate is symmetrically provided with two bosses, and the two shear beam load cells are symmetrically mounted on the two bosses.

The pressing head can be a bolt, and the self-aligning ball can be a steel ball.

The display can be an LED digital display tube.

Compared with the prior art, the beneficial effects of the utility model are as follows:

The sensor used in the utility model is a shear beam type weighing sensor. Through two sets of force transmission components (self-aligning balls can be automatically centered), it can ensure that the weight of the forklift frame in the vertical direction will be transmitted to the shear beam type weighing sensor. On the sensor, the sum of the shear forces measured by the two shear beam weighing sensors is the total weight of the cargo. The biggest advantage of the shear beam load cell is that it can handle the partial load and the change of the load position better, so the utility model can realize high weighing accuracy and large weighing capacity. The utility model has simple structure, easy installation and is suitable for mass production.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

FIG. 2 is a top view structural schematic diagram of FIG. 1 (display and processor are omitted).

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Figures 1 and 2, the utility model embodiment includes a display 1 (LED digital display tube), a processor 2, a signal line 3, a front hanging plate 4, a shear beam type load cell 5 (2 pieces), and a boss 6 (2 pieces), upper pressure head 7, steel ball 8, lower pressure bolt 9, spring leaf 10, rear hanging plate 11 and fastening bolt 12.

The display 1 is connected with the processor 2 and installed on the body of the forklift (not shown in the figure). The front hanging plate 3 is connected with the hanging plate (not shown in the figure) of the forklift. The two bosses 4 are welded together with the front hanging plate 4, and the two bosses 4 are arranged symmetrically. The output end of the shear beam load cell 5 is connected to the input end of the processor 2 through the signal line 3 . Two shear beam type load cells 5 are symmetrically arranged, one end of the shear beam type load cell 5 is fixedly installed on the boss 4 through a fastening bolt 12, and the other end of the shear beam type load cell extends into the rear hanging plate 11 to open out of the mounting slot. There is a force transmission component in the installation groove, and the force transmission component is provided with an upper pressure head 7, a steel ball 8, and a lower pressure bolt 9. The upper pressure head 7 is welded on the upper side of the installation groove, and the upper pressure head 7 presses the steel ball 8, The steel ball has a self-aligning effect, and the lower end of the steel ball 8 presses the down-pressing bolt 9, and the down-pressing bolt 9 is fixed on the end of the shear beam type load cell 5 by a nut. The spring leaf 10 blocks the opening of the front end of the installation groove, which can play a certain protective role. When the fork of the forklift clamps the goods, the gravity is transmitted to the shear beam type load cell 5 through the upper pressing head 7, the steel ball 8, and the lower pressing bolt 9.

The working principle of this embodiment is:

When the forklift picks up the goods, the weight is directly transmitted to the shear beam load cell 5 through the rear hanging plate 11, and the shear beam load cell 5 converts the change of weight into the change ΔR/R of the strain gauge resistance, and then passes through The bridge measurement circuit converts the voltage change into an output, and the output value is connected to the input terminal of the processor 2 through the signal line of the sensor 5, and the processor 2 performs filter processing on the input signal value, and converts it through A/D into a digital signal, and the measured weight value is calculated in the system according to the established mechanical numerical model, and displayed on the LED digital display tube 1.

Claims (4)

1. A forklift weighing device, characterized in that it is provided with a front hanging plate, two shear beam type load cells, a rear hanging plate, a processor and a display; The front hanging plate is connected with the external forklift hanging plate, and one end of the two shear beam load cells is fixed on the front hanging plate, and the other ends of the two shear beam load cells are all extended into the thickness direction of the rear hanging plate In the installation groove, there are two sets of force transmission components in the installation groove. Each set of force transmission components is equipped with an upper pressure head, a lower pressure head and an aligning ball. The upper pressure head is fixed on the top wall of the installation groove, and the lower pressure head is connected to the The other end of the shear beam type load cell is fixedly connected, the self-aligning ball is set between the upper pressure head and the lower pressure head, the rear hanging plate is connected with the external fork, and the processor is connected to the two shear beam type load cells The electric signal is connected, the display is connected to the processor by electric signal, and the processor and the display are both arranged on the external forklift body. 2. The weighing device of a forklift according to claim 1, wherein the front hanging plate is symmetrically provided with two bosses, and the two shear beam load cells are symmetrically mounted on the two bosses. 3. The weighing device for a forklift according to claim 1, wherein the pressing head is a bolt, and the self-aligning ball is a steel ball. 4. The forklift weighing device according to claim 1, characterized in that the display is an LED digital display tube.

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