A weighing device

Abstract

The application relates to a weighing device which comprises a mounting unit, a linkage unit and a weighing transmission unit; the mounting unit comprises an upper connecting piece, a middle connecting piece and a lower connecting piece which are arranged in a split mode; the linkage unit comprises a linkage pull rod which is bent and hinged between the connecting pieces; the middle connecting piece comprises two connecting blocks which can move towards or away from each other as a hinged base in synchronous linkage of the linkage pull rod; the weighing transmission unit comprises a force sensor and a sensor force receiving body, the force sensor and the sensor force receiving body are respectively installed on the opposite ends of the two connecting blocks, and the contact point between the force sensor and the sensor force receiving body is located on the center line of the connecting blocks. The weighing device can solve the problems of low precision, complex structure, difficult installation and poor stability of the existing weighing device, and can realize precise weighing in an automatic process.

Description

Technical Field

[0001] This application relates to the field of weighing, storage and transportation technology, and more specifically, to a weighing device. Background Technology

[0002] Currently, the mechanical weighing devices of gantry cranes mainly include drum base type, double trolley frame type, reducer base type, and trolley rail type. They all use the change of electrical signal caused by the deformation of the sensor under force to measure the load. However, due to factors such as the sensor installation position and the influence of the external environment, the engineering application effect is not satisfactory.

[0003] The drum base type only weighs part of the load on the drum, and the rigidity of the equipment affects the load measurement, resulting in a weighing accuracy of less than 5%. It is mostly used for overload limiters.

[0004] The torque measurement method for the reducer base requires measuring the rotational torque of the reducer as a whole around the low-speed shaft. The mechanism is complex and the weighing accuracy is less than 3%.

[0005] The rail scale for trolleys replaces some of the rails at parking positions with weighing sensors. Although the weighing accuracy is high, it only weighs at specific locations and cannot weigh the entire process. In addition, it causes impact at the seams, is prone to wear, and has low reliability.

[0006] The widely used double-layer trolley frame mechanism is complex, has a large overall height, high manufacturing cost, and is difficult to install and debug. While it offers high weighing accuracy, it is prone to drift, resulting in low long-term stability and requiring frequent adjustments and calibrations to meet requirements. Existing grab bucket weighing devices, due to limited installation space, cause various problems with the complex forces acting on the sensors, hindering their widespread application.

[0007] In the process of upgrading existing manually operated grab cranes to automation and intelligence, most of them need to be equipped with weighing devices, such as automatic loading of ash and slag cranes. However, it is difficult to achieve automated and accurate weighing by adding weighing devices to existing equipment. Utility Model Content

[0008] The purpose of this application is to provide a weighing device that features long-term stable high-precision weighing, simple installation, convenient maintenance, and economic applicability. Compared with the widely used double-layer trolley frame weighing mechanism, it greatly reduces equipment costs and can be directly installed on in-service equipment without the need for large-scale modification of existing equipment.

[0009] To achieve the above objectives, this utility model provides a weighing device, including an installation unit, a linkage unit, and a weighing transfer unit; The installation unit includes a separate upper connector, a middle connector, and a lower connector. The upper connector is used to connect to the lifting mechanism, and the lower connector is used to connect to the lifting device. The linkage unit includes a linkage rod that is bent and hinged between the upper connector, the middle connector and the lower connector. The middle connector includes two connecting blocks, which can move towards or away from each other as hinge bases during the synchronous linkage of the linkage rod. The linkage rod and the connecting block are arranged in a mirror-symmetrical manner on both sides of the weighing device; The weighing transfer unit includes a force sensor and a sensor force receiving body. The force sensor and the sensor force receiving body are respectively installed on the opposite ends of two connecting blocks, and the contact point between the force sensor and the sensor force receiving body is located on the symmetrical center line of the connecting blocks.

[0010] In an optional embodiment, the linkage rod is arranged on the front and rear sides in the thickness direction of the mounting unit, and each side includes at least two sets of linkage rods that are hinged to each other or back to back, and each set includes two bent linkage rods.

[0011] In an optional embodiment, the linkage rod includes an upper linkage rod hinged between the upper connector and the middle connector, and a lower linkage rod hinged between the lower connector and the middle connector. The upper linkage rods are all the same length, and the lower linkage rods are all the same length.

[0012] In an optional embodiment, the length of the upper linkage rod is the same as the length of the lower linkage rod, and the acute angle between each linkage rod and different connecting parts is the same.

[0013] In an optional embodiment, the hinge connection center line formed between the hinge center of the upper linkage rod and the hinge center of the lower linkage rod on the two connecting blocks coincides with the center line of the force sensor.

[0014] In an optional embodiment, the upper linkage rod and the lower linkage rod are mirror-symmetrical about the hinged connection centerline.

[0015] In an optional implementation, four sets of linkage rods are provided on each side of the installation unit in the front-rear direction, divided into two pairs of mirror-symmetrical linkage rods, with each pair of linkage rods bending in the same direction.

[0016] In an optional embodiment, a sensor support is mounted on the connecting block, and the force sensor is mounted on the sensor support; In an optional implementation, when the linkage rods are bent and hinged in opposite directions, the force sensor includes a tensile sensor.

[0017] In an optional embodiment, when the linkage rod is bent and hinged in the opposite direction, the force sensor includes a pressure sensor.

[0018] The weighing device in this application can solve the problems of low accuracy, complex structure, difficult installation, and poor stability of existing weighing devices, and can realize accurate weighing in automated processes.

[0019] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the weighing device in this application; Figure 2 This is a side view of the weighing device in this application; Figure 3 This is a cross-sectional view of the central part of the weighing device along its length in this application. Figure 4 This is a cross-sectional view of the central part of the weighing device in the width direction in this application; Figure 5 A schematic diagram showing the usage status of a single-row, single-sensor weighing device; Figure 6 This is a schematic diagram showing the usage status of a dual-row, dual-sensor weighing device.

[0022] icon: 1- Lifting mechanism; 2- Grab bucket; 10-Mounting unit; 11-Upper connector; 12-Middle connector; 121-First connector; 122-Second connector; 13-Lower connector; 20 - Linkage unit; 21 - Upper linkage rod; 22 - Lower linkage rod; 23 - First pin; 24 - Second pin; 25 - Third pin; 30-Weighing transfer unit; 31-Force sensor; 32-Sensor force-bearing body; 33-Sensor support. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The weighing device in this application is mainly used in bridge gantry grab cranes. By improving the structural composition of the weighing device, the external size of the device is reduced, the weighing accuracy is guaranteed, and it is also convenient for direct retrofitting of in-service equipment.

[0027] See Figure 1 and combined Figures 2-6 The weighing device of this utility model has a main structure including an installation unit 10, a linkage unit 20, and a weighing transfer unit 30.

[0028] The installation unit 10 adopts a split structure, including an upper connector 11, a middle connector 12, and a lower connector 13. The upper connector 11 is connected to the lifting mechanism 1 of the crane via a chain, and the lower connector 13 is modified from the existing crossbeam of the grab bucket 2 and is connected to the grab bucket 2 and other lifting devices.

[0029] The modular design allows for direct installation on existing cranes without requiring large-scale modifications to the original structure, greatly facilitating the implementation of automation and intelligent upgrades.

[0030] The central connector 12 includes two independent connecting blocks, namely a first connecting block 121 and a second connecting block 122. The two connecting blocks serve as the hinge base of the linkage unit 20, enabling synchronous movement in opposite directions or back directions during the linkage between the installation unit 10 and the linkage unit 20, while also providing an installation base for the weighing transfer unit 30.

[0031] The linkage unit 20 includes a linkage rod that is bent and hinged between the upper connector 11, the middle connector 12, and the lower connector 13. Specifically, the linkage rod includes an upper linkage rod 21 hinged between the upper connector 11 and the middle connector 12, and an upper linkage rod 21 hinged between the lower connector 13 and the middle connector 12.

[0032] By combining the linkage rods with the upper, middle and lower three-layer connecting parts, a balanced and stable single-link weighing structure or double-parallel-link weighing structure can be formed according to the group of linkage rods. This ensures the anti-torsional rigidity of the weighing device and the unidirectional force on the sensor, while also ensuring that the grab bucket will not fall when the sensor with low overload capacity is damaged.

[0033] The weighing transfer unit 30 includes a force sensor 31 and a sensor force receiving body 32. The force sensor 31, which is a tensile or compressive sensor, is mounted on the opposite end of the first connecting block 121 via a sensor support 33. The sensor force receiving body 32 is specifically a frustum structure with an abutment boss that allows the sensing component of the force sensor 31 to abut against it, and is fixedly mounted on the opposite end of the second connecting block 122.

[0034] Furthermore, the point of contact between the sensing component on the force sensor 31 and the abutment of the sensor force-receiving body 32 is located on the symmetrical center line between the first connecting block 121 and the second connecting block 122. This symmetrical center line can be understood as the perpendicular bisector of the line connecting the hinge center of the upper linkage rod 21 and the hinge center of the lower linkage rod 22 on the two connecting blocks.

[0035] Furthermore, on the two connecting blocks mentioned above, the line connecting the hinge center of the upper linkage rod 21 and the hinge center of the lower linkage rod 22 constitutes the hinge connection center line. At the same time, the hinge connection center line coincides with the center line of the force sensor 31, making the upper linkage rod 21 and the lower linkage rod 22 mirror symmetrical with respect to this hinge connection center line.

[0036] The working mechanism of the weighing device in this application is as follows: when the crane lifting mechanism 1 lifts the load, the crane lifting mechanism 1 drives the upper connecting part 11 of the weighing device to rise. Since the lower connecting part 13 is connected to the cargo, the upper connecting part 11 and the lower connecting part 13 move towards or away from each other, thereby driving the linkage rods on both sides to stretch and deflect. This, in turn, pushes the middle connecting parts 12 on both sides to move towards each other, or pulls the middle connecting parts 12 on both sides to move away from each other. Finally, it pushes the force sensor 31 and the sensor pressure body to squeeze each other, or stretches the force sensor 31 and the sensor pressure body to move away from each other, thus realizing the transfer of load and accurate weighing of cargo mass. A deeper mechanism is that the force detected by the force sensor 31 is converted into an electrical signal, which, after calibration, can calculate the actual load weight.

[0037] Preferably, each upper linkage rod 21 has the same length, and each lower linkage rod 22 has the same length. Furthermore, the upper linkage rod 21 and lower linkage rod 22 have the same length, and the acute angle formed by each linkage rod and different connecting parts is also the same. This allows the linkage rods and two connecting blocks located on the left and right sides to be arranged in a mirror-symmetrical manner on both sides of the weighing device, ensuring maximum force balance.

[0038] Due to the symmetrical arrangement and precise geometric relationship of the linkage rod, the swaying force or torsional force in the non-perpendicular direction can be effectively filtered out, so that the force sensor 31 mainly bears the axial force of pure tension or pure compression, thereby significantly improving the weighing accuracy and long-term stability.

[0039] Specifically, linkage rods are provided on both sides of the installation unit 10 in the thickness direction, i.e., the front-to-back direction. At the same time, at least two sets of linkage rods are provided on each side, which are hinged in opposite directions or back-to-back. Each set of linkage rods includes two bent linkage rods.

[0040] At the hinged connection angle of the linkage rod, the top end of the upper linkage rod 21 is hinged to the upper connector 11 through the first pin 23, the bottom end of the lower linkage rod 22 is hinged to the lower connector 13 through the second pin 24, and at the same time, the bottom end of the upper linkage rod 21 and the top end of the lower linkage rod 22 are hinged to the middle connector 12 through the third pin 25.

[0041] When two sets of linkage rods are set on each side in the front-rear direction, a single-link weighing structure can be formed. Preferably, in this application, four sets of linkage rods are set on each side in the front-rear direction of the installation unit 10. The four sets of linkage rods are divided into two pairs of left and right mirror symmetrical rods. Each pair of linkage rods is bent in the same direction, thereby forming a double-parallel linkage weighing structure.

[0042] When the weighing device in this application is in operation, the weight of the goods is in the vertical direction, while the force sensor 31 of the weighing device is installed horizontally. The double parallel linkage weighing structure formed above can effectively and accurately transmit the weight of the goods, ensuring the safety, effectiveness and reliability of the structure.

[0043] In terms of more specific structural composition, the four sets of linkage rods on each side in the front and rear directions form parallelograms that are symmetrical in front and back and up and down in the plane, forming a total of eight sets of completely symmetrical parallelograms in front and back and up and down. This ensures that when the weighing device is subjected to and measured vertical loads, the upper and lower connecting parts only undergo slight vertical displacement, without any deflection or torsion in other directions, thus ensuring the torsional and anti-skew rigidity of the weighing device. At the same time, it ensures that the two middle connecting parts 12 can only move horizontally left and right.

[0044] At the same time, it ensures that the two connecting blocks of the middle connector 12 can only move towards each other or away from each other in the horizontal direction, so that the sensor triggers the sensing of the force to transmit the load, and only bears the horizontal unidirectional load.

[0045] The tension and compression state of the force sensor 31 in this application depends on the tilt direction of the linkage rod between each connecting part. The tensile sensor or the tensile sensor can be set between the upper and lower connecting parts according to the relative or opposite movement of the two connecting blocks to achieve weighing. The specific setting depends on the bending direction of the linkage rod.

[0046] Specifically, when multiple sets of linkage rods are bent and hinged towards each other in the center, the force sensor 31 includes a tensile sensor; while when multiple sets of linkage rods are bent and hinged away from each other, the force sensor 31 includes a compressive sensor. The specific configuration can be flexibly adjusted according to the actual structure. Additionally, a hook scale can be installed between the upper connector 11 and the lower connector 13 to achieve direct weighing in the vertical direction.

[0047] It should be noted that by adjusting the length and installation direction of the linkage rod, the load transmitted by the horizontally installed force sensor 31 can be matched with the weight of the goods in the vertical direction. A smaller sensor can also be used to measure vertical loads several times the transmitted force. Furthermore, provided that the upper linkage rod 21 and the lower linkage rod 22 are of the same length, the length of the lower linkage rod 22 can differ from that of the upper linkage rod 21. This can be achieved through specific geometric relationships to convert the transmitted load sensed by the force sensor 31 into the weight of the goods.

[0048] In this application, the upper connector 11, the middle connector 12, and the lower connector 13 arranged sequentially form a single-row installation structure. At the same time, they are combined with a set of weighing transfer units 30 to form a single-row single sensor. In specific installation, a double-row dual-sensor installation can be adopted to obtain the total load corresponding to the mass of the goods from the dual sensors.

[0049] Based on the hinge relationship between different connectors, the weighing device can also be arranged in the form of a double row of single sensors, which can be flexibly selected for weighing various specifications of lifting tools and items.

[0050] The weighing device in this application has a simple structure and flexible installation, and is suitable for automatic weighing systems of grab cranes of various specifications, such as gantry cranes and port loading and unloading bridges.

[0051] This utility model can form a long-term stable, high-precision weighing, simple installation, convenient maintenance, and economical solution for grab bucket 2 weighing devices.

[0052] The cost is only one-quarter of the widely used double-layer trolley frame weighing device, saving tens of thousands of yuan per device; it is suitable for most grab buckets and can be directly installed on existing equipment without large-scale modification of existing equipment; the double parallel linkage weighing structure has the characteristics of stability and reliability, low headroom, rigid anti-torsion, and anti-grab bucket drop.

[0053] The force sensor 31, which is subjected to force in a single horizontal direction, is mounted on a load-bearing structure. Whether it is a horizontal compressive sensor, a tensile sensor, or a vertical tensile sensor, it ensures that the sensor is subjected to force in a single direction without interference from external forces in other directions. This ensures accurate weighing and stable and reliable weighing performance, and can significantly reduce the cost of subsequent debugging, calibration, and maintenance and replacement. Whether it is a new installation or an added installation, there is no need for cumbersome calibration and adjustment during use.

[0054] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A weighing device, characterized in that, Includes installation unit, linkage unit, and weighing transfer unit; The installation unit includes a separate upper connector, a middle connector, and a lower connector. The upper connector is used to connect to the lifting mechanism, and the lower connector is used to connect to the lifting device. The linkage unit includes a linkage rod that is bent and hinged between the upper connector, the middle connector and the lower connector. The middle connector includes two connecting blocks, which can move towards or away from each other as hinge bases during the synchronous linkage of the linkage rod. The linkage rod and the connecting block are arranged in a mirror-symmetrical manner on both sides of the weighing device; The weighing transfer unit includes a force sensor and a sensor force receiving body. The force sensor and the sensor force receiving body are respectively installed on the opposite ends of two connecting blocks, and the contact point between the force sensor and the sensor force receiving body is located on the symmetrical center line of the connecting blocks.

2. The weighing device according to claim 1, characterized in that, The linkage rods are arranged on the front and rear sides in the thickness direction of the mounting unit, and each side includes at least two sets of linkage rods that are hinged to each other or back to back, and each set includes two bent linkage rods.

3. The weighing device according to claim 1, characterized in that, The linkage rod includes an upper linkage rod hinged between the upper connector and the middle connector, and a lower linkage rod hinged between the lower connector and the middle connector; The upper linkage rods are all the same length, and the lower linkage rods are all the same length.

4. The weighing device according to claim 3, characterized in that, The upper linkage rod has the same length as the lower linkage rod, and each linkage rod has the same acute angle with different connecting parts.

5. The weighing device according to claim 4, characterized in that, On the two connecting blocks, the hinge connection center line formed between the hinge center of the upper linkage rod and the hinge center of the lower linkage rod coincides with the center line of the force sensor.

6. The weighing device according to claim 5, characterized in that, The upper linkage rod and the lower linkage rod are mirror-symmetrical about the center line of their hinged connection.

7. The weighing device according to claim 4, characterized in that, The installation unit is equipped with four sets of linkage rods on each side in the front and rear directions, which are divided into two pairs of mirror symmetrical linkage rods, and each pair of linkage rods bends in the same direction.

8. The weighing device according to claim 4, characterized in that, A sensor support is installed on the connecting block, and the force sensor is installed on the sensor support.

9. The weighing device according to any one of claims 1-8, characterized in that, When the linkage rods are bent and hinged in opposite directions, the force sensor includes a tensile sensor.

10. The weighing device according to any one of claims 1-8, characterized in that, When the linkage rod is bent and hinged in the opposite direction, the force sensor includes a pressure sensor.

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