Weighing assembly with anti-loosening function

Abstract

The utility model provides a weighing assembly (10) with an anti-loosening function. The weighing assembly (10) comprises a weighing plate (11); the weighing sensor (17) is directly or indirectly fixed on the weighing plate (11); and the limiting element (14) is arranged on the side of the weighing sensor (17) and abuts against the weighing sensor (17), and the limiting element (14) is configured to extrude the weighing sensor (17) at least in one direction when the limiting element (14) is fixed. According to the weighing assembly with the anti-loosening function, the anti-loosening effect can be realized by adding the limiting element, the installation is simple, the occupied space is limited, the function is reliable, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the fields of bioengineering, medical devices or weighing technology, specifically a weighing component with anti-loosening function. Background Technology

[0002] In existing weighing devices, one end of the load cell is fixed to the weighing plate, and the weighing hook is directly or indirectly connected to the other end of the load cell. Usually, this fixing of the load cell is achieved by screws. However, when the weighing hook is subjected to lateral force, this screw fixing is easy to loosen, causing the load cell to swing from side to side, thereby causing interference with other components or causing distortion of the sensor's sensing value.

[0003] Setting a positioning groove on the weighing plate or sensor fixing block, and then fixing the load cell in the positioning groove, helps to prevent the load cell from loosening and shifting. However, this method has certain constraints. For example, when the load cell size is too small and the positioning groove size is too large, or when there is a gap between the fixing screw and the fixing hole, or when the tightening force of the fixing screw is not large enough and the friction between the load cell and the mounting surface is not large enough, the weighing hook will be more likely to swing when subjected to a large lateral force (the force perpendicular to the tightening force of the screw fixing the load cell, i.e., the shear force, about 50 to 100 N). Furthermore, due to the amplification effect of the lever (the load cell is long and only one end is fixed), the swing at the fixed end will be amplified more than 10 times to the swing displacement at the front end of the weighing hook. Therefore, although the sensor fixing block or weighing base is designed with a positioning groove that matches the mounting surface of the load cell for positioning and preventing swaying, the external dimensions of the load cell have dimensional tolerances, and the machining dimensions of the positioning groove that matches it also have errors. Therefore, it is difficult to design a suitable dimensional tolerance unless it is adapted every time, but this does not conform to the interchangeability principle of mass production. If the gap is designed too small, it is difficult to install. If the gap is too large, swaying will inevitably occur due to the small clamping area and the screw hole gap. Since the load cell is a long strip structure, a small sway at the mounting position will be transmitted to the hook end with a large swing amplitude, which may cause the hook or fixing block to interfere with other structural components, thereby affecting the process accuracy. Utility Model Content

[0004] The purpose of this invention is to at least partially overcome the defects of the prior art and provide a weighing component with anti-loosening function.

[0005] To achieve the above objectives or one of the objectives, the technical solution of this utility model is as follows:

[0006] A weighing assembly with anti-loosening function, the weighing assembly comprising:

[0007] Weighing plate;

[0008] The load cell is fixed directly or indirectly to the weighing plate; and

[0009] A limiting element is disposed beside and abuts against the load cell, and the limiting element is configured to compress the load cell in at least one direction when the limiting element is fixed.

[0010] According to a preferred embodiment of the present invention, the limiting element is configured to compress the weighing sensor in two directions when the limiting element is fixed.

[0011] According to a preferred embodiment of the present invention, the weighing assembly further includes a sensor fixing block, which is fixed to the weighing plate, and the weighing sensor is fixed to the sensor fixing block.

[0012] According to a preferred embodiment of the present invention, a sensor positioning groove is provided on the weighing plate or sensor fixing block, and the weighing sensor is fixed in the sensor positioning groove.

[0013] According to a preferred embodiment of the present invention, the limiting element includes a plurality of spaced-apart recesses, the recesses being located at the edge of the limiting element.

[0014] According to a preferred embodiment of the present invention, the recess at least partially has a limiting cone surface, which gradually tapers inward in a direction from top to bottom;

[0015] The weighing assembly also includes multiple limiting element fixing members with the same number as the recesses. The limiting element fixing members cooperate with the recesses. Each limiting element fixing member is provided with an actuating cone surface. The actuating cone surface is used to cooperate with the limiting cone surface to push the limiting element when the limiting element fixing member is rotated.

[0016] According to a preferred embodiment of the present invention, at least one of the plurality of recesses has a larger size than the other recesses.

[0017] According to a preferred embodiment of the present invention, the limiting element is strip-shaped or L-shaped.

[0018] According to a preferred embodiment of the present invention, the limiting element is L-shaped and includes three recesses, which are respectively disposed on the first arm, the second arm and the outer corner of the L-shaped limiting element.

[0019] The size of the recess on the first arm is larger than the size of the recess on the second arm.

[0020] According to a preferred embodiment of the present invention, the limiting element is L-shaped and includes four recesses, one recess is disposed on the first arm of the L-shaped limiting element, two recesses are disposed on the second arm of the L-shaped limiting element, and one recess is disposed on the outer corner of the L-shaped limiting element.

[0021] The size of the recess on the first arm is larger than the size of any recess on the second arm.

[0022] According to a preferred embodiment of the present invention, the inner corner of the L-shaped limiting element has a process hole or a stress relief groove.

[0023] This utility model has the following beneficial effects:

[0024] 1. The structure is simple. Only an L-shaped or I-shaped (or other shape conforming to the principle of this utility model) limiting element needs to be added to the original parts to achieve the anti-loosening effect;

[0025] 2. Simple installation; all screws are installed vertically, without changing the original fixing method or adjusting the structural layout.

[0026] 3. Saves space: The added limiting element has a compact structure, does not occupy horizontal space, and has very little vertical space, which can effectively utilize the original space size without changing other parts;

[0027] 4. Reliable function: The load cell is clamped in the horizontal X and / or Y directions and constrained to one side of the U-shaped limiting groove. The screw (countersunk screw) has a conical surface. The component force of the inclined surface will continuously generate a clamping force. In addition, the screw can be prevented from loosening by means of thread adhesive, etc. It has been tested and verified to be very reliable.

[0028] 5. Positioning function: Since the limiting (or clamping) element of the sensor is in the same direction as the compressive force of the load cell, the mounting reference surface (side) of the load cell can be clearly defined, which facilitates structural design and control of the mating clearance.

[0029] 6. Low cost: Only a few screw holes (fixing holes) need to be added to the sensor fixing block, along with a corresponding limit (or clamping) element, to achieve the anti-loosening function. The key limit element has a simple structure and low manufacturing cost. For older equipment, only the weighing plate or sensor fixing block needs to be modified, adding the corresponding screw holes and equipping it with a limit (or clamping) element; no major replacement or rework is required. Attached Figure Description

[0030] Figure 1 This is a perspective view of a weighing component with anti-loosening function according to the first embodiment of the present invention;

[0031] Figure 2 An exploded view of a weighing component with anti-loosening function according to a first embodiment of the present invention;

[0032] Figure 3 This is a top view of a weighing assembly with anti-loosening function according to the first embodiment of the present invention, wherein the limiting element and the limiting element fixing member are in an uninstalled state;

[0033] Figure 4 The limiting element and the limiting element fixing member of the first embodiment are shown in multiple views;

[0034] Figure 5 This is a perspective view of a weighing assembly with anti-loosening function according to a second embodiment of the present invention, wherein some components are shown in an exploded view;

[0035] Figure 6 This is a partial top view of a weighing assembly with anti-loosening function according to the second embodiment of the present invention, wherein the limiting element and the limiting element fixing member are in an uninstalled state;

[0036] Figure 7 This is a partial exploded view of a weighing component with anti-loosening function according to the second embodiment of the present invention;

[0037] Figure 8 This is a partial perspective view of a weighing component with anti-loosening function according to the second embodiment of the present invention;

[0038] Figure 9 The limiting element and the limiting element fastener of the second embodiment are shown in multiple views;

[0039] Figure 10 The diagram illustrates the structure of a weighing assembly without the limiting element of this invention and the reasons why the weighing sensor is prone to displacement.

[0040] Figure 11 The limiting element of the third embodiment is shown in multiple views. Detailed Implementation

[0041] Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements. Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the drawings.

[0042] The attached diagram illustrates the solution and structure of this invention for providing limiting and anti-loosening for a load cell. An L-shaped or I-shaped (strip-shaped) limiting element creates a lateral or diagonal compression on the load cell, achieving clamping and preventing loosening due to gaps in screws or limiting grooves. This, in turn, prevents the weighing hook at the front end from swaying left and right under lateral force, thus avoiding interference with other components and preventing sensor distortion. The limiting element can also be called a sensor clamping plate (or limiting block).

[0043] Figure 1 The first embodiment of the present invention provides a perspective view of a weighing assembly with anti-loosening function. The weighing assembly 10 includes a weighing plate 11, limiting elements 14, sensor fixing members 15, limiting element fixing members 16, weighing sensors 17, weighing hooks 18, and hook fixing members 19. The weighing plate 11 is generally disc-shaped, with three arms extending outward from its outer periphery. The weighing sensors 17 are elongated, with three in total. Each weighing sensor 17 is fixed to one of the three arms of the weighing plate 11 by a sensor fixing member 15 (which is a fixing screw). The weighing hook 18 is fixed to the weighing sensor 17 by the hook fixing member 19. The weighing assembly 10 has three limiting elements 14, which are positioned beside and abut against the weighing sensors 17. The limiting elements 14 are configured to compress the weighing sensor 17 in at least one direction when the limiting element 14 is fixed. Figure 1 In one embodiment, the limiting element 14 presses the weighing sensor 17 in two directions.

[0044] refer to Figure 2 The three arms of the weighing plate 11 are provided with sensor positioning grooves 13 corresponding to the weighing sensor 17. The sensor positioning grooves 13 can just accommodate the weighing sensor 17, and their size corresponds to the size of the weighing sensor 17. The sensor positioning grooves 13 can play a certain role in positioning and preventing loosening of the weighing sensor 17. However, due to dimensional tolerances and gaps in the sensor fixing parts 15, the weighing sensor 17 is still prone to movement or deflection. This is why the limiting element 14 is set to prevent the weighing sensor 17 from loosening.

[0045] The following is a reference to the appendix. Figure 4The first embodiment of the limiting element fixing member 16 is introduced. Here, the limiting element 14 is L-shaped and includes three recesses 21. The recesses 21 are all located at the outer edge of the limiting element 14. The recesses 21 are preferably semi-circular or quarter-circular in shape. The L-shaped limiting element 14 includes a first arm, a second arm, and a corner portion connecting the first arm and the second arm. The three recesses 21 are respectively provided on the first arm, the second arm, and the outer corner portion of the L-shaped limiting element 14. It should be noted that the limiting element 14 can have more than three recesses. Therefore, the limiting element 14 can include multiple spaced-apart recesses 21.

[0046] Advantageously, the recess 21 at least partially has a limiting cone surface 22, which gradually tapers inward from top to bottom. Specifically, the lower part of the recess 21 is a partially cylindrical surface, for example, a half-cylinder or a quarter-cylinder surface, and the upper part of the recess 21 forms the limiting cone surface 22. The weighing assembly 10 also includes a plurality of limiting element fasteners 16, the same number as the recesses 21. The limiting element fasteners 16 can be screws, and they cooperate with the recesses 21. Each limiting element fastener 16 is provided with an actuating cone surface 23, which cooperates with the limiting cone surface 22 to push the limiting element 14 when the limiting element fastener 16 is rotated. Figure 4 As shown, Figure 4 Multiple arrows are shown, indicating the screwing direction of the limiting element fixing member 16 and the movement trend of the limiting element fixing member 16 and the limiting element 14. That is, when the limiting element fixing member 16 is tightened, the limiting element fixing member 16 and the limiting element 14 tend to bias and move in the direction indicated by the arrows. In addition, the inner corner of the L-shaped limiting element 14 has a process hole 24, which facilitates a closer fit between the two surfaces of the L-shaped limiting element and the load cell, and also has the function of releasing stress, serving as a stress relief groove.

[0047] Preferably, at least one of the recesses 21 is larger than the others; for example, the recess 21 on the first arm is larger than the recess 21 on the second arm. This means that the recess 21 on the first arm provides more space for the limiting element fixing member 16, thus allowing the limiting element 14 to have a certain adaptive margin to accommodate the position of the load cell 17. The weighing plate 11 has the same number of fixing holes 20 as the limiting element fixing member 16 and the recesses 21, so that the limiting element fixing member 16 can extend into the fixing holes 20.

[0048] The limiting element fixing part 16 (countersunk screw) presses the inclined surface of the L-shaped limiting element 14, causing the limiting element 14 to move in the direction of the arrow ( Figure 3The weighing sensor 17 is moved and squeezed. The other side of the weighing sensor 17 is restricted from lateral movement by the sensor positioning groove 13 of the weighing seat 11, while the longitudinal movement is restricted by two sensor fixing parts 15, thereby generating a continuous clamping force and displacement restriction on the weighing sensor in two directions.

[0049] Figure 5 The first view shows a perspective view of a weighing assembly with anti-loosening function according to the second embodiment of the present invention. The weighing assembly 10 with anti-loosening function includes a weighing plate 11, a sensor fixing block 12, a limiting element 14, a sensor fixing member 15, a limiting element fixing member 16, a weighing sensor 17, a weighing hook 18, and a hook fixing member 19. The weighing plate 11 extends outward with four support arms. A circuit board 31 is provided on the weighing plate 11. The sensor fixing block 12 is fixedly connected to the support arm. The weighing sensor 17 is elongated and has four arms. Each load cell 17 is fixed to one of the four arms of the load cell fixing block 12 by a load cell fixing member 15, which is a fixing screw. A weighing hook 18 is fixed to the load cell 17 by a hook fixing member 19. The weighing assembly 10 has four limiting elements 14, which are disposed beside and abut against the load cell 17. The limiting elements 14 are configured to compress the load cell 17 in at least one direction when the limiting element 14 is fixed. Figure 5 In one embodiment, the limiting element 14 presses the weighing sensor 17 in two directions.

[0050] refer to Figure 7 The sensor fixing block 12 is provided with a sensor positioning groove 13 corresponding to the weighing sensor 17. The sensor positioning groove 13 accommodates the weighing sensor 17 and its size corresponds to the size of the weighing sensor 17. The sensor positioning groove 13 can play a certain role in positioning and preventing loosening of the weighing sensor 17. However, due to dimensional tolerances and gaps in the sensor fixing parts 15, the weighing sensor 17 is still prone to movement or deflection. This is why the limiting element 14 is set to prevent the weighing sensor 17 from loosening.

[0051] The following is a reference to the appendix. Figure 9The second embodiment of the limiting element fixing member 16 is introduced. Here, the limiting element 14 is L-shaped and includes four recesses 21. The recesses 21 are all located at the outer edge of the limiting element 14. The recesses 21 are preferably semi-circular or quarter-circular in shape. The L-shaped limiting element 14 includes a first arm, a second arm, and a corner portion connecting the first arm and the second arm. One recess 21 is provided on the first arm of the L-shaped limiting element 14, two recesses 21 are provided on the second arm of the L-shaped limiting element 14 (one of the two recesses is a screw hole shared with the sensor fixing block), and one recess 21 is provided on the outer corner portion of the L-shaped limiting element 14. It should be noted that the limiting element 14 may have more or fewer than four recesses. Therefore, the limiting element 14 may include a plurality of spaced-apart recesses 21.

[0052] Advantageously, the recess 21 at least partially has a limiting cone surface 22, which gradually tapers inward from top to bottom. Specifically, the lower part of the recess 21 is a partially cylindrical surface, for example, a half-cylinder or a quarter-cylinder surface, and the upper part of the recess 21 forms the limiting cone surface 22. The weighing assembly 10 also includes a plurality of limiting element fasteners 16, the same number as the recesses 21. The limiting element fasteners 16 can be screws, and they cooperate with the recesses 21. Each limiting element fastener 16 is provided with an actuating cone surface 23, which cooperates with the limiting cone surface 22 to push the limiting element 14 when the limiting element fastener 16 is rotated. Figure 4 As shown, Figure 9 Multiple arrows are shown, indicating the screwing direction of the limiting element fixing member 16 and the movement trend of the limiting element fixing member 16 and the limiting element 14. That is, when the limiting element fixing member 16 is tightened, the limiting element fixing member 16 and the limiting element 14 tend to bias and move in the direction indicated by the arrows. In addition, the inner corner of the L-shaped limiting element 14 has a stress relief groove 24.

[0053] Preferably, the size of the recess 21 on the first arm is larger than the size of any recess 21 on the second arm. This means that the recess 21 on the first arm provides more space for the limiting element fixing member 16, thus allowing the limiting element 14 to have a certain adaptive margin to accommodate the position of the weighing sensor 17.

[0054] Similarly, the limiting element fixing member 16 (countersunk screw) presses against the inclined surface of the L-shaped limiting element 14, causing the limiting element 14 to move in the direction of the arrow ( Figure 6 The weighing sensor 17 is moved and squeezed. The other side of the weighing sensor 17 is restricted to lateral movement by the sensor positioning groove 13 on the sensor fixing block 12, and longitudinal movement is restricted by two sensor fixing parts 15, thereby generating continuous clamping force and displacement restriction on the weighing sensor in two directions.

[0055] Figure 10 The diagram illustrates the structure of a weighing assembly without the limiting element of this invention and the reason why the weighing sensor is prone to displacement. Without the limiting element, even if the sensor fixing part 15 is tightened, it still cannot resist the force on the front side and will shift. Figure 10 The right figure shows that the load cell will shift when subjected to lateral force, which is unavoidable during the hanging and unloading of the object being weighed. It is evident that the weighing assembly is prone to lateral swaying without limiting elements, leading to significant weighing errors or calibration failures. Simply relying on positioning grooves cannot truly prevent lateral shifting; therefore, the problem of load cell looseness needs to be addressed at its source.

[0056] This invention enables the anti-loosening of weighing sensors within a small spatial dimension without altering the existing layout or space occupation, and allows for upgrades based on existing equipment. The designer utilizes engineering mechanics principles, generating lateral force and movement through inclined plane compression, to design a Type I (… Figure 11 The limiting element (or clamping plate) is either L-shaped or (or other shapes conforming to the principle of this utility model). This structure can be achieved by only partially reworking the sensor fixing block or weighing plate of the existing equipment and adding fixing holes (screw holes).

[0057] Therefore, based on the original load cell fixing scheme, only a matching limiting element needs to be added to clamp the load cell using ordinary screws, thus achieving a very reliable anti-loosening effect. It is important to note that during the installation of the limiting element, the two screws fixing the load cell should be pre-tightened (with a certain distance remaining before tightening). After the countersunk screws (i.e., the limiting element fixing part 16) have fully tightened the L-shaped limiting element (clamping plate), the load cell fixing screws (i.e., the sensor fixing part 15) should then be tightened.

[0058] Figure 11 This shows another type of I-type limiting element. The type I-type limiting element can also achieve the anti-loosening effect by clamping the load cell from the side, because in actual process, what needs to be prevented most is the lateral swing or displacement of the sensor.

[0059] This utility model has the following beneficial effects:

[0060] 1. The structure is simple. Only an L-shaped or I-shaped (or other shape conforming to the principle of this utility model) limiting element needs to be added to the original parts to achieve the anti-loosening effect;

[0061] 2. Simple installation; all screws are installed vertically, without changing the original fixing method or adjusting the structural layout.

[0062] 3. Saves space: The added limiting element has a compact structure, does not occupy horizontal space, and has very little vertical space, which can effectively utilize the original space size without changing other parts;

[0063] 4. Reliable function: The load cell is clamped in the horizontal X and / or Y directions and constrained to one side of the U-shaped limiting groove. The screw (countersunk screw) has a conical surface. The component force of the inclined surface will continuously generate a clamping force. In addition, the screw can be prevented from loosening by means of thread adhesive, etc. It has been tested and verified to be very reliable.

[0064] 5. Positioning function: Since the limiting (or clamping) element of the sensor is in the same direction as the compressive force of the load cell, the mounting reference surface (side) of the load cell can be clearly defined, which facilitates structural design and control of the mating clearance.

[0065] 6. Low cost: Only a few screw holes (fixing holes) need to be added to the sensor fixing block, along with a corresponding limit (or clamping) element, to achieve the anti-loosening function. The key limit element has a simple structure and low manufacturing cost. For older equipment, only the weighing plate or sensor fixing block needs to be modified, adding the corresponding screw holes and equipping it with a limit (or clamping) element; no major replacement or rework is required.

[0066] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0067] List of reference numerals in the attached diagram:

[0068] 10 weighing components

[0069] 11 Weighing Plate

[0070] 12 sensor fixing blocks

[0071] 13 sensor positioning slots

[0072] 14 limit elements

[0073] 15 Sensor Mounting

[0074] 16 Limiting element fixing parts

[0075] 17 load cells

[0076] 18 Weighing hooks

[0077] 19 Hook fasteners

[0078] 20 fixing holes

[0079] 21 recess

[0080] 22 limiting cone surface

[0081] 23 Actuating Conical Surface

[0082] 24 process holes

[0083] 31 Circuit board.

Claims

1. A weighing assembly (10) with anti-loosening function, characterized in that, The weighing assembly (10) comprises: a weighing plate (11); a weighing sensor (17) fixed directly or indirectly on the weighing plate (11); and a limiting element (14) disposed beside the weighing sensor (17) and abutting against the weighing sensor (17), and the limiting element (14) is configured to press the weighing sensor (17) at least in one direction when the limiting element (14) is fixed.

2. The weighing assembly (10) with anti-loose function according to claim 1, wherein: the limiting element (14) is configured to press the weighing sensor (17) in two directions when the limiting element (14) is fixed.

3. The weighing assembly (10) with anti-loose function according to claim 1, wherein: the weighing assembly (10) further comprises a sensor fixing block (12) fixed on the weighing plate (11), and the weighing sensor (17) is fixed on the sensor fixing block (12).

4. The weighing assembly (10) with anti-loose function according to claim 3, wherein: a sensor positioning groove (13) is provided on the weighing plate (11) or the sensor fixing block (12), and the weighing sensor (17) is fixed in the sensor positioning groove (13).

5. The weighing assembly (10) with anti-loose function according to any one of claims 1-4, wherein: the limiting element (14) comprises a plurality of spaced recesses (21) located at the edges of the limiting element (14).

6. The weighing assembly (10) with anti-loose function according to claim 5, wherein: the recesses (21) are at least partially provided with limiting tapered surfaces (22) which gradually shrink in the direction from top to bottom; the weighing assembly (10) further comprises a plurality of limiting element fixing members (16) which are the same in number as the recesses (21), the limiting element fixing members (16) cooperate with the recesses (21), and each limiting element fixing member (16) is provided with an actuating tapered surface (23) which is used to cooperate with the limiting tapered surface (22) to push the limiting element (14) when the limiting element fixing member (16) is rotated.

7. The weighing assembly (10) with anti-loose function according to claim 5, wherein: at least one of the plurality of recesses (21) is larger in size than the other recesses (21).

8. The weighing assembly (10) with anti-loose function according to claim 5, wherein: the limiting element (14) is in the shape of a strip or an L shape.

9. The weighing assembly (10) with anti-loose function according to claim 6, wherein: the limiting element (14) is in the shape of an L shape and comprises three recesses (21), and the three recesses (21) are respectively provided on the first arm, the second arm and the outer corner of the L-shaped limiting element (14). The size of the recess (21) on the first arm is greater than the size of the recess (21) on the second arm.

10. The weighing assembly (10) with anti-loosening function according to claim 6, characterized in that: The limiting element (14) is L-shaped and comprises four recesses (21), one recess (21) is arranged on the first arm of the L-shaped limiting element (14), two recesses (21) are arranged on the second arm of the L-shaped limiting element (14), and one recess (21) is arranged on the outer corner of the L-shaped limiting element (14); The size of the recess (21) on the first arm is greater than the size of any recess (21) on the second arm.

Images