A weighing module that can weigh a bottom load

Abstract

The utility model relates to the technical field of weight measurement discloses a kind of weighing module that can be weighed to bottom load, including desktop platform and mounting plate, mounting plate is detachably set in the upside of desktop platform, two identical cantilever type weighing sensors are provided on the upside of mounting plate, two cantilever type weighing sensors are parallelly arranged, cantilever type weighing sensor is provided with load connection end, mounting rod is fixedly connected between the load connection end of two cantilever type weighing sensors, the axial direction of mounting rod is perpendicular to the extension direction of cantilever type weighing sensor, load rod is hungly arranged at the midpoint of mounting rod, the axial direction of load rod is perpendicular to horizontal plane, load rod is used to connect external load to be weighed, and avoiding slot for avoiding load rod is provided on mounting plate.The utility model can weigh the load of bottom, the space requirement above desktop platform is smaller when weighing, it is suitable for the scene without enough space above desktop platform, and it is convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of weight measurement technology, and more specifically, to a weighing module capable of weighing bottom loads. Background Technology

[0002] Existing weighing systems generally adopt a top-load-bearing structure (such as platform scales and top-mounted load cells), where the weight acts directly on the upper surface of the weighing module. While this approach performs well in typical scenarios, it has the following inherent drawbacks: 1. When there is insufficient weighing space above a desktop platform, or when the object being weighed is too large to be easily moved to the platform, the large object needs to be broken down into smaller parts for weighing, which is inconvenient. 2. The sensor and force transmission mechanism are located below the desktop platform (or load), requiring disassembly of the upper structure for maintenance or calibration, which is cumbersome and inconvenient for installation and maintenance. Furthermore, some existing weighing modules suffer from low measurement accuracy, and excessively heavy objects can easily damage the weighing module. Utility Model Content

[0003] To address at least one of the aforementioned problems, this invention provides a weighing module capable of weighing bottom loads, comprising a desktop platform and a mounting plate. The mounting plate is detachably mounted on the upper side of the desktop platform. Two identical cantilever load cells are mounted on the upper side of the mounting plate, arranged in parallel. Each cantilever load cell has a load connection end. A mounting rod is fixedly connected between the load connection ends of the two cantilever load cells. The axial direction of the mounting rod is perpendicular to the extension direction of the cantilever load cells. A load rod is suspended at the midpoint of the mounting rod, with its axial direction perpendicular to the horizontal plane. The load rod is used to connect an external load to be weighed. The mounting plate has a clearance groove for avoiding the load rod, and the desktop platform has a clearance hole for avoiding the load rod. This invention can weigh bottom loads with minimal space requirements above the desktop platform, making it suitable for scenarios where there is insufficient space above the desktop platform, and is easy to maintain.

[0004] Optionally, the mounting plate includes a base plate and a heightening plate. The base plate is provided with a limiting support for abutting against the lower end of the load connection end, and the limiting support is positioned below the load connection end.

[0005] Optionally, the limiting support is a bolt, and the limiting support is threadedly connected to the base plate.

[0006] Optionally, the upper end of the limiting support is provided with a tapered portion, and the top end of the tapered portion is provided with an abutting plane for abutting against the lower end of the load connection end.

[0007] Optionally, the limiting support is made of polyoxymethylene.

[0008] Optionally, the end of the cantilever load cell away from the load connection end is a fixed end, and a shim plate is connected between the raising plate and the fixed end, the shim plate being made of insulating material.

[0009] Optionally, the raised platform is made of bakelite.

[0010] Optionally, the cantilever load cell is provided with a through hole, the through hole being horizontal and perpendicular to the extension direction of the cantilever load cell. The through hole includes a first circular through hole, a second circular through hole, a third circular through hole, and a strip-shaped through hole. The second circular through hole is located between the first circular through hole and the third circular through hole. The strip-shaped through hole connects the first circular through hole, the second circular through hole, and the third circular through hole sequentially along the extension direction of the cantilever load cell.

[0011] Optionally, the upper end of the load rod is provided with a mounting block, and the mounting block is provided with a bayonet for mounting the mounting rod. A locking rod is threadedly connected to the opening of the bayonet, and the mounting rod is confined within the bayonet by the locking rod. The diameter of the mounting block is smaller than the diameter of the clearance hole. During installation, the mounting block can pass through the clearance hole from bottom to top, and the clearance groove avoids the mounting block.

[0012] Optionally, a positioning groove for limiting the locking rod is provided at the midpoint of the mounting rod.

[0013] Compared to existing technologies, the weighing module of this invention, capable of weighing bottom loads, requires less space above the desktop platform during weighing, making it suitable for scenarios where there is insufficient space above the desktop platform and facilitating maintenance. The mounting block can pass through the clearance hole and clearance groove from bottom to top and connect to the mounting rod, eliminating the need for installation from above the desktop platform and reducing installation difficulty. A positioning groove is provided at the midpoint of the mounting rod to limit the locking rod, allowing the locking rod to be positioned at the midpoint of the mounting rod, thereby ensuring that the force on the two cantilever load cells is more even and similar, further improving measurement accuracy and precision. Attached Figure Description

[0014] Figure 1 This is a perspective view of the weighing module of this utility model that can weigh the load at the bottom;

[0015] Figure 2 For this Figure 1 Enlarged view of section A in the middle;

[0016] Figure 3This is a schematic diagram of the cantilever weighing sensor part of the weighing module of this utility model, which can weigh the bottom load.

[0017] Figure 4 For this Figure 3 Enlarged view of section B;

[0018] Figure 5 This is a structural schematic diagram of the limiting support component of the weighing module of this utility model, which can weigh the bottom load;

[0019] Figure 6 This is a schematic diagram of the mounting rod of the weighing module of this utility model, which can weigh the load at the bottom.

[0020] Figure 7 This is a schematic diagram of the structure of the base plate of the weighing module of this utility model, which can weigh the bottom load;

[0021] The component names corresponding to the various labels in the figure are as follows: 1 is the desktop platform, 101 is the clearance hole, 2 is the mounting plate, 201 is the clearance groove, 21 is the base plate, 22 is the heightening plate, 3 is the cantilever load cell, 301 is the load connection end, 302 is the fixed end, 303 is the through hole, 304 is the first round through hole, 305 is the second round through hole, 306 is the third round through hole, 307 is the strip through hole, 4 is the mounting rod, 401 is the positioning groove, 5 is the load rod, 51 is the mounting block, 52 is the bayonet, 6 is the limiting backing part, 601 is the conical part, 602 is the abutment plane, 7 is the heightening plate, and 8 is the locking rod. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] See Figures 1-7This utility model embodiment provides a weighing module capable of weighing bottom loads, including a desktop platform 1 and a mounting plate 2. The mounting plate 2 is detachably mounted on the upper side of the desktop platform 1. Two cantilever load cells 3 with identical structures are mounted on the upper side of the mounting plate 2. The two cantilever load cells 3 are arranged in parallel. Each cantilever load cell 3 is provided with a load connection end 301. A mounting rod 4 is fixedly connected between the load connection ends 301 of the two cantilever load cells 3. The axial direction of the mounting rod 4 is perpendicular to the extension direction of the cantilever load cells 3. The midpoint of the mounting rod 4 is... A load bar 5 is suspended, with its axial direction perpendicular to the horizontal plane. The load bar 5 is used to connect an external load to be weighed. The mounting plate 2 is provided with a clearance groove 201 to avoid the load bar 5, and the desktop platform 1 is provided with a clearance hole 101 to avoid the load bar 5. This utility model can weigh the load at the bottom, and the space requirement above the desktop platform is small during weighing, making it suitable for scenarios where there is not enough space above the desktop platform. In addition, since the mounting plate 2, cantilever weighing sensor 3 and other components are all located on the upper side of the desktop platform 1, maintenance is convenient and the cost is low.

[0026] See Figure 1 and Figure 2 The mounting plate 2 includes a base plate 21 and a raised plate 22 fixed by bolts. The base plate 21 is detachably fixed to the desktop platform 1 by bolts or other means for easy maintenance. The base plate 21 is provided with a limiting support 6 for abutting against the lower end of the load connection end 301. The limiting support 6 is located below the load connection end 301. When the load weight loaded on the load connection end 301 is too heavy, the cantilever load cell 3 will undergo large bending deformation. The limiting support 6 limits the bending amplitude to prevent excessive and irreversible bending that could damage the sensor, thus extending its service life. Specifically, when the weight is too heavy, the cantilever load cell 3 will issue an overload alarm signal to inform the user that the weight exceeds the maximum weighing range. At this time, the cantilever load cell 3 is in an undamaged state. This prevents some users from accidentally weighing objects that exceed the maximum weighing range, thus damaging the cantilever load cell 3.

[0027] See Figure 1 , Figure 2 and Figure 5The limiting support 6 is a bolt, threaded onto the base plate 21. Rotating the limiting support 6 allows for height adjustment as needed. The limiting support 6 can be adaptively adjusted to accommodate the bending amplitude of different cantilever load cells 3 at maximum weighing, making adjustment convenient and compatible with various cantilever load cells 3. It should be noted that some high-precision cantilever load cells 3 will exhibit a greater bending amplitude when weighing the same weight compared to lower-precision sensors. The upper end of the limiting support 6 is provided with a tapered portion 6. 01. The top of the tapered part 601 is provided with an abutting surface 602 for abutting against the lower end of the load connection end 301. The tapered contact surface can automatically adjust the position deviation when under pressure, so that the load is transmitted along the main axis of the sensor, avoiding lateral force interference with measurement accuracy, thereby improving measurement accuracy. The limiting backing part 6 is made of polyoxymethylene, which has a lower hardness than the cantilever load cell 3. The cantilever load cell 3 is usually made of metal. This prevents the limiting backing part 6 from scratching the cantilever load cell 3 when it abuts against the limiting part. In addition, polyoxymethylene has excellent wear resistance and rigidity, making it more durable.

[0028] See Figure 1 and Figure 3 The end of the cantilever load cell 3 furthest from the load connection end 301 is the fixed end 302. A shim plate 7 is connected between the lifting plate 22 and the fixed end 302, allowing the load connection end 301 to be suspended and thus providing space for bending deformation. The shim plate 7 is made of insulating material. The cantilever load cell 3 is electrically connected to a signal transmission line. The insulating material of the shim plate 7 can prevent short circuits between the cantilever load cell 3 and the metal base plate 21, ensuring stable signal transmission. The shim plate 7 is made of bakelite, which has excellent properties such as insulation, no static electricity, wear resistance, and high temperature resistance, and also has high mechanical strength, making the fixed end 302 installed stably and improving the measurement accuracy.

[0029] See Figure 3 and Figure 4The cantilever load cell 3 is provided with a through hole 303. The through hole 303 is horizontal and perpendicular to the extension direction of the cantilever load cell 3. The through hole 303 includes a first circular through hole 304, a second circular through hole 305, a third circular through hole 306, and a strip through hole 307. The second circular through hole 305 is located between the first circular through hole 304 and the third circular through hole 306. The strip through hole 307 connects the first circular through hole 304, the second circular through hole 305, and the third circular through hole 306 in sequence along the extension direction of the cantilever load cell 3. The through hole 303 changes the cross-sectional shape of the beam, causing higher stress concentration in the edge area of ​​the hole when under stress, thereby amplifying the signal output of the strain gauge, improving the sensitivity of the sensor, and thus improving the measurement accuracy. By setting multiple circular through holes and strip through holes, the area of ​​the opening is enlarged, thereby causing higher stress concentration in the edge area of ​​the hole when under stress.

[0030] Specifically, the first circular through-hole 304 and the third circular through-hole 306 are located at both ends of the strain zone, forming symmetrical stress concentration points to ensure the consistency of strain signals; the second circular through-hole 305 is centrally located to further optimize stress distribution and avoid excessive local stress leading to plastic deformation; the strip-shaped through-hole 307 connects all the circular holes along the extension direction of the cantilever beam, expanding the opening area and enhancing the overall strain concentration effect; the above-mentioned multi-hole series structure provides a more uniform stress gradient than a single opening, avoiding excessive stress at a single point leading to fatigue fracture; the strip-shaped through-hole 307 makes the stress distribution more continuous, reduces abrupt changes, and improves the linearity and long-term stability of the sensor.

[0031] See Figure 1 , Figure 2 , Figure 3 and Figure 7 The upper end of the load bar 5 is provided with a mounting block 51. The mounting block 51 is provided with a bayonet 52 for mounting the mounting rod 4. A locking rod 8 is threadedly connected to the opening of the bayonet 52. The mounting rod 4 is confined within the bayonet 52 by the locking rod 8. The diameter of the mounting block 51 is smaller than the diameter of the clearance hole 101. Here, the diameter of the mounting block 51 is the maximum length in the horizontal direction. During installation, the mounting block 51 can pass through the clearance hole 101 from bottom to top. The clearance groove 201 avoids the mounting block 51, so that the mounting block 51 can pass through the clearance hole 101 and the clearance groove 201 from bottom to top, and then connect with the mounting rod 4. It does not need to be installed from above the desktop platform, and the installation difficulty is low. Since the application scenario of this module is that there is no space above the desktop platform, the ease of installation of the load bar 5 needs to be considered.

[0032] See Figure 1 , Figure 2 , Figure 6 and Figure 7A positioning groove 401 is provided at the midpoint of the mounting rod 4 to limit the locking rod 8, so that the locking rod 8 can be positioned at the midpoint of the mounting rod 4, thereby making the two cantilever load cells 3 bear force evenly (tend to be the same), further improving the measurement accuracy and precision; the positioning groove (401) rigidly fixes the locking rod 8 to the geometric midpoint of the mounting rod 4, ensuring that when external force (such as load) is transmitted through the locking rod 8, the force path length of the cantilever load cells 3 on both sides is symmetrical, thus eliminating the possibility of off-center loading from a structural perspective.

[0033] The weighing module of this invention, capable of weighing bottom loads, requires minimal space above the desktop platform during weighing, making it suitable for scenarios where there is insufficient space above the desktop platform and facilitating maintenance. The mounting block can pass through the clearance hole and clearance groove from bottom to top and connect to the mounting rod, eliminating the need for installation from above the desktop platform and simplifying installation. A positioning groove is provided at the midpoint of the mounting rod to limit the locking rod, allowing the locking rod to be positioned at the midpoint of the mounting rod. This ensures that the two cantilever load cells experience uniform and similar forces, further improving measurement accuracy and precision.

[0034] In the description of this disclosure, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0035] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] In this disclosure, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first feature or in indirect contact with the first feature through an intermediate medium.

[0038] It should be noted that when a component is described as being "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is described as being "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A weighing module capable of weighing bottom loads, characterized in that, The system includes a desktop platform (1) and a mounting plate (2). The mounting plate (2) is detachably mounted on the upper side of the desktop platform (1). Two cantilever load cells (3) with identical structures are mounted on the upper side of the mounting plate (2). The two cantilever load cells (3) are arranged in parallel. Each cantilever load cell (3) is provided with a load connection end (301). A mounting rod (4) is fixedly connected between the load connection ends (301) of the two cantilever load cells (3). The axial direction of the mounting rod (4) is perpendicular to the extension direction of the cantilever load cell (3). A load rod (5) is suspended at the midpoint of the mounting rod (4). The axial direction of the load rod (5) is perpendicular to the horizontal plane. The load rod (5) is used to connect an external load to be weighed. The mounting plate (2) is provided with a clearance groove (201) for avoiding the load rod (5). The desktop platform (1) is provided with a clearance hole (101) for avoiding the load rod (5).

2. The weighing module for weighing bottom loads according to claim 1, characterized in that, The mounting plate (2) includes a base plate (21) and a heightening plate (22). The base plate (21) is provided with a limiting support (6) for abutting against the lower end of the load connection end (301). The limiting support (6) is located below the load connection end (301).

3. The weighing module for weighing bottom loads according to claim 2, characterized in that, The limiting backing component (6) is a bolt, and the limiting backing component (6) is threadedly connected to the base plate (21).

4. The weighing module for weighing bottom loads according to claim 2, characterized in that, The upper end of the limiting support (6) is provided with a tapered part (601), and the top end of the tapered part (601) is provided with an abutting plane (602) for abutting against the lower end of the load connection end (301).

5. The weighing module for weighing bottom loads according to claim 2, characterized in that, The limiting backing component (6) is made of polyoxymethylene.

6. The weighing module for weighing bottom loads according to claim 2, characterized in that, The end of the cantilever load cell (3) away from the load connection end (301) is a fixed end (302). A shim plate (7) is connected between the lifting plate (22) and the fixed end (302). The shim plate (7) is made of insulating material.

7. The weighing module for weighing bottom loads according to claim 6, characterized in that, The raised board (7) is made of bakelite.

8. The weighing module for weighing bottom loads according to claim 1, characterized in that, The cantilever load cell (3) is provided with a through hole (303). The through hole (303) is horizontal and perpendicular to the extension direction of the cantilever load cell (3). The through hole (303) includes a first round through hole (304), a second round through hole (305), a third round through hole (306), and a strip through hole (307). The second round through hole (305) is located between the first round through hole (304) and the third round through hole (306). The strip through hole (307) connects the first round through hole (304), the second round through hole (305), and the third round through hole (306) in sequence along the extension direction of the cantilever load cell (3).

9. The weighing module for weighing bottom loads according to any one of claims 1-8, characterized in that, The upper end of the load rod (5) is provided with a mounting block (51), and the mounting block (51) is provided with a bayonet (52) for mounting the mounting rod (4). A locking rod (8) is threadedly connected to the opening of the bayonet (52). The mounting rod (4) is confined within the bayonet (52) by the locking rod (8). The diameter of the mounting block (51) is smaller than the diameter of the clearance hole (101). During installation, the mounting block (51) can pass through the clearance hole (101) from bottom to top, and the clearance groove (201) avoids the mounting block (51).

10. The weighing module for weighing bottom loads according to claim 9, characterized in that, The mounting rod (4) is provided with a positioning groove (401) at the midpoint for limiting the locking rod (8).

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