A weighing apparatus having a load cell with a linear guide

Abstract

The invention is a weighing apparatus comprising a torque transmission assembly (40) having a torque shaft (42) connected to a torque-generating drive assembly (30) and a shaft bearing (44) in which the torque shaft (42) is rotatably supported on an extension axis (x); a scoop assembly (20) having a scoop element (22) which is rotated by the torque shaft (42) from a front end thereof on the extension axis; and a load cell (50) adapted to the scoop assembly (20) to measure weight. The weighing apparatus comprises a base plate (60) on which the load cell (50) is mounted in a linearly guided manner in a mounting position such that an upper load extension (52) under the shaft bearing (44) is engaged.

Description

[0001] A WEIGHING APPARATUS HAVING A LOAD CELL WITH A LINEAR GUIDE

[0002] TECHNICAL FIELD

[0003] The present invention relates to a weighing apparatus, in particular a weighing apparatus with a load cell having a dosing scoop for the gravimetric feeding of powder-like products into processing devices.

[0004] BACKGROUND OF THE INVENTION

[0005] A weighing apparatus with a gravimetric feeding scoop is a precise and effective system that enables the dosing and mixing of raw materials or components at predetermined ratios in industrial processes. These systems control the flow of materials based on the principle of gravity and generally operate in conjunction with weighing sensors or load cells to measure the material weight in real time. In this way, gravimetric feeding scoops provide a continuous and stable flow, offering a high level of accuracy and repeatability in production processes. They are widely used in various sectors such as plastics, food, chemical, and pharmaceutical industries, and provide advantages such as cost savings, increased product quality, and reduced waste.

[0006] Gravimetric feeding scoops consist of a series of components, and the correct ratio of material flow is achieved through the coordinated operation of these components. These components include hoppers where materials are stored and introduced into the feeding process, sensitive weighing systems that continuously measure the amount of material in the hopper, and feeding mechanisms used to adjust the flow rate of the materials.

[0007] The operating principle of gravimetric feeding scoops is to ensure material flow through a combination of gravity and weighing systems. During the process, the weight of the material in the hopper is continuously measured by the weighing system. The obtained weight value is compared with a predetermined target value, and the feeding mechanism adjusts the material flow rate to reach the target value. This process is important for ensuring a continuous and stable material flow and for achieving a high level of accuracy and repeatability in production processes.

[0008] BRIEF DESCRIPTION OF THE INVENTION

[0009] The object of the invention is to provide a weighing system that accurately and precisely measures the weight of loads and in which the load cell can be easily disassembled.

[0010] To achieve the aforementioned object, the invention relates to a weighing apparatus comprising a torque transmission assembly having a torque shaft connected to a torque-generating drive assembly and a shaft bearing in which the torque shaft is rotatably supported on an extension axis; a scoop assembly having a scoop element which is rotated by the torque shaft from a front end thereof on the extension axis; and a load cell adapted to the scoop assembly to measure weight. The weighing apparatus includes a base plate on which the load cell is mounted in a linearly guided manner in a mounting position such that an upper load extension under the shaft bearing is engaged. The load extension comprises a sensor that provides for weight measurement. The sensor obtains the weight data via strain. When an adjustment problem or a similar malfunction occurs in the load extension, the entire load cell is easily removed from the weighing apparatus for maintenance.

[0011] Preferably, a removable fastening element is provided on the base plate, extending from the base of the load cell to a mounting hole. When the load cell is mounted on the base plate, it is locked against axial movement by the fastening element, and measurement accuracy is ensured.

[0012] Preferably, the load cell is arranged in the mounting position to extend transversely on the base plate along the extension axis of the torque shaft, with a front part facing the scoop assembly and an opposite rear part facing the drive assembly. In this case, when the load cell is removed from the weighing apparatus for service purposes, there is no need to disassemble the scoop.

[0013] Preferably, the connecting shaft extends such that it is directly and exclusively supported by the torque shaft during rotation. Since no additional support elements or components are required, it has been possible to reduce the total weight and dimensions of the system. Thus, a lighter and more compact structure is provided.

[0014] Preferably, the load cell comprises a vertically movable weighing piece arranged to provide load transfer between the load extension and the torque shaft. The weighing piece extends vertically from the torque shaft to the load extension, precisely transferring the load on the scoop element to the load cell.

[0015] Preferably, the torque transmission assembly includes a hammer element extending radially outward relative to the torque shaft so as to limit the rotation angle of the torque shaft, and a stopper bearing having a stopper wall against which it abuts at a limit angle. The stopper bearing and hammer element, which limit the rotation angle of the torque shaft, create a radial stop, providing angularly controlled movement, preventing overrotation, and ensuring system safety. With the advantage of precise positioning, it offers a more durable system by reducing wear and tear.

[0016] Preferably, the hammer element is integrated with a collar adapted to the drive assembly and rotating on the extension axis of the torque shaft. The integrated hammer element and collar offer advantages with a simplified design, increased reliability, lightweight structure, and precise motion control.

[0017] Preferably, the hammer element is adapted to the rear end of the torque shaft. Adapting the hammer element to the rear end of the torque shaft offers a simpler and more compact design, reducing the weight and size of the equipment. This structure facilitates assembly and maintenance processes while increasing system reliability by reducingthe number of components and potential failure points. Preferably, the hammer element comprises a magnetic coupling element which is magnetically coupled to a counterpart and adapted to the stopper bearing. The magnetic coupling provides temporary locking to prevent rebound movement when the hammer element strikes the stopper bearing.

[0018] Preferably, the drive assembly includes a piston arranged to produce torque and a piston bearing arranged to align the piston with the torque shaft on the extension axis. This design provides more precise and controlled torque application, thereby increasing system performance and efficiency. The use of a piston and piston bearing offers a smoother and more continuous motion, which reduces vibrations and noise, improving user comfort and equipment lifespan. Furthermore, this configuration provides a more environmentally friendly operation with lower energy consumption and less heat generation.

[0019] Preferably, a bearing element is fixed on the base plate so as to raise the piston bearing from its upper part. The bearing element raises the piston bearing to allow the load cell to be placed on the base plate, enablingthe creation of a compact measuring apparatus,

[0020] Preferably, the bearing element is in the form of a fork that rests on the base plate by its feet, and the load cell is aligned to advance transversely between the feet of the bearing element. With its fork shape, the bearing element distributes the weight of the piston bearing onto the base plate. At the same time, since the distance between the feet is greater than the width of the load cell, it is possible to remove the load cell by moving it transversely under the bearing element.

[0021] Preferably, it includes a housing surrounding the drive assembly and the torque transmission assembly. The housing has a hole in its front wall through which the connecting shaft passes. In this way, the housing protects the equipment from external factors, making it more long-lasting and durable. The hole in the front wall of the housing allows the passage of the connecting shaft and supports the proper functioning of the system while also helping to protect the components. Preferably, a rear panel facing the rear part of the load cell is removably arranged in the housing. In this case, it becomes possible to disassemble the load cell together with the rear panel.

[0022] Preferably, the load cell is in a rectangular prismatic form, seated on the base plate from its narrow edge along a slot. In this way, it is possible to mount the load cell in a suitable position under the shaft bearing so that it precisely measures the weight of the scoop assembly without causing measurement errors.

[0023] BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of a representative configuration of the weighing apparatus accordingto the invention, with the scoop in an upward-facing position.

[0025] Figure 2 is a transverse cross-sectional view of the weighing apparatus shown in Figure 1 , taken along an axis passing through its center.

[0026] Figure 3 is a transverse cross-sectional view of a representative configuration of the weighing apparatus according to the invention, near one side, with the upper part of the housing removed.

[0027] Figure 4 is a side view of the weighing apparatus according to the invention with the housing removed.

[0028] DETAILED DESCRIPTION OF THE INVENTION

[0029] In this detailed description, the development subject to the invention is explained with reference to examples for the sole purpose of better illustrating the subject matter, without any limitation.

[0030] In Figure 1 , the gravimetric dosing and weighing apparatus is shown in perspective, with a scoop assembly (20) extending from the front wall (12) of a housing (10), and its scoop element (22) facing upwards in a filling position. A hole (16) is opened in the flat front wall (12) of a box-like housing (10) formed by joining flat panels. A connecting shaft (26) in the form of a cylinder extends outwards from a front end thereof through the hole (16). The connecting shaft (26) extends perpendicularly to the front wall (12) on an extension axis (x) in the horizontal plane. The connecting shaft (26) is fixed to the scoop element (22) at its front end. From the lower edge of the housing (10), a pair of flange-like feet (14) in the form of flat panels extend outwards in opposite directions. There are screw holes on the feet (14) for fixing to a platform. The scoop element (22) is in the form of a hollow hemisphere with a circular mouth facing upwards in a filling position of the scoop assembly (20). In a discharge position, the mouth of the scoop (20) rotates by a limit angle (a) of 90 degrees and pours the measured product, for example, a powder chemical, in the container it surrounds, downwards by its own weight. Above the hole (16) on the front wall (12), a pusher piston (70) is located, extending parallel to the connecting shaft (26). The pusher piston (70) is arranged to apply an impact to the scoop assembly (20) from its outer periphery in the direction of linear advancement.

[0031] In Figure 2, the same weighing apparatus is shown in a transverse cross-section with the scoop assembly (20) in the filling position. A drive assembly (30) in the structure of a rotary piston comprises a piston bearing (34) and its rotary piston (32) element. The piston bearing (34) supports the piston (32) such that it is aligned on the extension axis (x). The piston (32) is arranged to be rotatable in both directions on the extension axis (x). At the front end of the piston (32), the torque transmission assembly (40) is engaged with the rear end of a torque shaft (42) to provide torque transmission. The torque shaft (42) is a shaft extending on the extension axis (x). The front end of the torque shaft (42) is connected to the rear end of the connecting shaft (26) with a form-fit connection to transmit torque. The torque shaft (42) is rotatably supported at both ends by bearings in a surrounding shaft bearing (44). The shaft bearing (44) is fixed on a slide (60) inside the housing (10). The slide (60) elevates the shaft bearing (44) on a base plate of the housing (10) so that it is aligned with the extension axis (x).

[0032] At the end of the piston (32), a hammer element (46) having a collar and an arm extending radially outward therefrom is rotatably mounted. The hammer element (46) limits the rotational movement of the piston (32) at the limit angle. For this purpose, adjacent to the hammer element (46), a planar stopper bearing (48) is placed at each end of the 180-degree limit angle (a) swept by the arm of the hammer element (46). When the piston (32) rotates in one direction, it rotates the hammer element (46), and the rotation continues until the arm strikes the corresponding stopper bearing (48). When the arm of the hammer element (46) contacts the stopper bearing (48), the stopper bearing (48) blocks the rotation. Therefore, the piston (32) is now free to rotate only in the opposite direction. A magnetic coupling element (47), which is a magnet, is fixed onto the stopper bearing (48). The hammer element (46) is made of a ferromagnetic material. When the arm of the hammer element (46) reaches the stopper bearing (48), the corresponding face of the arm magnetically adheres to the magnetic coupling element (47). In this way, when the arm strikes the stopper bearing (48) due to its radial velocity, its rebound movement due to momentum is prevented by the magnetic force.

[0033] Below the front end of the torque shaft (42), there is a load cell (50) connected to the slide (60). The load cell (50) performs the weighing of the load by means of the strain caused by the load applied to the torque shaft (42), which is directly supported via the connecting shaft (26). The load cell (50) extends perpendicular to the base plate of the housing (10). A carrier element (24) is mounted between the scoop element (22) and the front wall (12), connected to the scoop element (22). The carrier element (24) has the structure of a metal plate and is fixedly mounted on the upper part of the front end of the vertically extending connecting shaft (26). A protrusion extends along the entire length of the rear end of the connecting shaft (26). This protrusion engages with a corresponding slot at the front end of the torque shaft (42) to provide torque transmission. Since the connecting shaft (26) is supported only by the torque shaft (42) on the extension axis (x), it can be simply removed by pulling it outwards when disassembly is required. In this case, the protrusion at the front end of the connecting shaft (26) exits the slot-like housing without any obstruction. The connecting shaft (26) is removed by pulling it through the hole (16) and can be taken out together with the scoop assembly (20) mounted on its front end. The pusher piston (70), extending parallel to the upper part of the connecting shaft (26), passes through a corresponding hole in the front wall (12), and its front end (72) extends to reach the scoop element (22) from its outer periphery with the forward movement of the piston. The drive part (74) of the pusher piston (70) is mounted on the shaft bearing (44).

[0034] Under the torque shaft (42), there is a block-shaped weighing piece (58) that is vertically movably seated on a load extension (52) of the load cell (50), which contains the measurement sensor. The load extension (52) is at a front part (54) of the load cell (50) facing the scoop assembly (20). The load cell (50), which has a rectangular prismatic structure, is placed in a linearly guided manner in a channel on a flat base plate (11) of the housing (10) from one of its narrow edges. The rear part (56) of the load cell (50) is spaced from the rear panel (15) of the housing (10). A fork-like bearing element (64) supports the drive assembly (30) by elevating it at its upper part and rests on the base (11 ) with its feet. The foot height of the bearing element (64) is set to be greater than the cell height (h) of the load cell (50) in its vertical position on the slot (62). A connecting element (51) in the form of a screw removably fastens the load cell (50) to a mounting hole (63) in the base plate (60). When the load cell (50) is to be removed from the housing (10), the rear panel (15) is detached. The connecting elements (51) that connect the load cell (50) to the base plate (60) are removed, and the load cell (50), which is linearly guided in the transverse direction within the slot (62), is simply removed by pulling it in the removal direction (r).

[0035] In Figure 3, the weighing apparatus is shown in perspective with the housing (10) removed. Since the diameter of the hole (16) on the front wall (12) is set wider than the diameter of the connecting shaft (26), the connecting shaft (26) can perform its rotational movement without contacting the front wall (12). The weighing apparatus is operated by being fixed, for example, to a chemical component feeding machine via its feet (14). In the filling position, for instance, a powder material is filled into the scoop element (22) through its mouth. The strain generated on the connecting shaft (26) due to the additional load on the scoop element (22) is read via displacement by the load cell (50) to perform weighing, and the weighing information is transmitted as an electrical signal to a main controller (not shown). When a position change confirmation is received from the controller, for example, when the load cell indicates a predetermined weight value, the drive assembly (30) is activated. At this moment, the hammer element (46) is connected to the stopper bearing (48) by the magnetic coupling element (47). The piston (32) applies a torque in the reverse direction, overcoming the magnetic force, and separates the hammer element (46) from the corresponding stopper bearing (48). The torque of the piston (32) rotates the torque shaft (42) in the torque transmission assembly (40) on the extension axis (x) with the help of bearings inside the shaft bearing (44). Thus, torque is transmitted from the front end of the torque shaft (42) to the rear end of the connecting shaft (26) via a form-fit connection, and in this way, the scoop assembly (20) is rotated 180 degrees towards the discharge position, transmitting the load to the shaft bearing (44) via the torque shaft (42). In this manner, the material filled and weighed in the scoop element (22) is discharged by gravity. To discharge material adhering to the inner wall of the scoop element (22) due to electrostatic forces, moisture, or other weak bonds, the pusher piston (70) is activated in the discharge position, and by applying an impact from its front end (72) to the outer periphery of the scoop element (22), it ensures that the remaining material is dislodged by vibration and discharged. During this process, to ensure that the scoop element (22) stops at the limit angle (a), the hammer element (46) comes to rest against the opposite stopper wall (48).

[0036] In Figure 4, the weighing apparatus is shown from the side with the housing (10) removed. The weighing apparatus carries the weighing piece (58) on the front part (54) of the prismatic load cell (50), which is slided on a base plate (60) located on the flat and planar base (11) of the housing (10), and the torque transmission assembly (40) above it. On the rear part of the base plate (60), the bearing element (64), rising from its lower end, supports the drive assembly (30) so that they have a co-rotating axis. The rear part (56) of the load cell (50) sits within the slot (62) between the legs of the bearing element (64).

[0037] REFERENCE NUMERALS

[0038] 10 Housing 45 Stopper wall 11 Base 46 Hammer element

[0039] 12 Front wall 47 Magnetic coupling element 14 Foot 48 Stopper bearing

[0040] 15 Rear panel 50 Load cell

[0041] 16 Hole 51 Connecting element 20 Scoop assembly 52 Load extension

[0042] 22 Scoop element 54 Front part

[0043] 24 Carrier element 56 Rear part

[0044] 26 Connecting shaft 58 Weighing piece

[0045] 30 Drive assembly 60 Base plate

[0046] 32 Piston 62 Slot

[0047] 34 Piston bearing 63 Mounting hole

[0048] 40 Torque transmission assembly 64 Bearing element

[0049] 42 Torque shaft 70 Pusher piston

[0050] 44 Shaft bearing 72 Front end

[0051] x Extension axis 74 Drive part

[0052] a Limit Angle h Cell height

[0053] r Removal direction

Claims

CLAIMS1- A weighing apparatus comprising a torque transmission assembly (40) having a torque shaft (42) connected to a torque-generating drive assembly (30) and a shaft bearing (44) in which the torque shaft (42) is rotatably supported on an extension axis (x); a scoop assembly (20) having a scoop element (22) which is rotated by the torque shaft (42) from a front end thereof on the extension axis; and a load cell (50) adapted to the scoop assembly (20) to measure weight, characterized by a base plate (60) on which the load cell (50) is mounted in a linearly guided manner in a mounting position such that an upper load extension (52) under the shaft bearing (44) is engaged.2- A weighing apparatus according to claim 1 , wherein a mounting hole (63) is provided on the base plate (60) and a removable fastening element (51) extending from the base of the load cell (50) to the mounting hole (63).3- A weighing apparatus according to any one of the preceding claims, wherein the load cell (50) is arranged in the mounting position to extend transversely on the base plate (60) along the extension axis (x) of the torque shaft (42), with a front part (54) facing the scoop assembly (20) and an opposite rear part (56) facing the drive assembly (30).4- A weighing apparatus according to any one of the preceding claims, wherein the connecting shaft (26) extends such that it is directly and exclusively supported by the torque shaft (42) during rotation.5- A weighing apparatus according to claim 4, wherein a vertically movable weighing piece (58) is arranged to provide load transfer between the load extension (52) of the load cell (50) and the torque shaft (42).6- A weighing apparatus according to any one of the preceding claims, wherein the torque transmission assembly (40) includes a hammer element (46) extending radially outward relative to the torque shaft (42) so as to limit the rotation angle of the torqueshaft (42), and a stopper bearing (48) having a stopper wall (45) against which it abuts at a limit angle (a).7- A weighing apparatus according to any one of the preceding claims, wherein the drive assembly (30) has a piston (32) arranged to produce torque and a piston bearing (34) arranged to align the piston (32) with the torque shaft (42) on the extension axis (x).8- A weighing apparatus according to claim 7, wherein a bearing element (64) is fixed on the base plate (60) so as to raise the piston bearing (34) from its upper part.9- A weighing apparatus according to claim 8, wherein the bearing element (64) is in the form of a fork that rests on the base plate (60) by its feet, and the load cell (50) is aligned to advance transversely between the feet of the bearing element (64).10- A weighing apparatus according to any one of the preceding claims, wherein a housing (10) is arranged to surround the drive assembly (30) and the torque transmission assembly (40) and having a hole (16) in its front wall (12) through which the connecting shaft (26) passes.11 - A weighing apparatus according to claim 10, wherein a rear panel (15) of the housing (10) facing the rear part (56) of the load cell (50) is removably arranged.12- A weighing apparatus according to any one of the preceding claims, wherein the load cell (50) is in a rectangular prismatic form, seated on the base plate (60) from its narrow edge along a slot (62).

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