High-precision weighing module

Abstract

The utility model relates to the technical field of weighing modules, in particular to a high-precision weighing module. A leveling mechanism is arranged at the bottom of the lower pressing plate, the sensor assembly is arranged between the lower pressing plate and the upper pressing plate and comprises an elastic body, a bearing hole and two mounting holes, the bearing hole is formed in the middle of the elastic body, the two mounting holes are formed in the two ends of the elastic body respectively, and the upper pressing plate is mounted at the top of the elastic body through a connecting piece. The connecting piece comprises two connecting plates arranged at the bottom of the upper pressing plate in parallel. The connecting plates are connected with the elastic body through bearing shafts penetrating through the bearing holes. According to the utility model, the bearing shaft of the fan-shaped structure forms shearing force on the elastic body, and the bearing hole and the bearing shaft are in point contact, so that the pressure transmission effect can be improved, the sensitivity is improved, and the weighing precision is obviously improved; through mutual cooperation of the protection plate, the limiting rod and other structures, the stress of the sensor is not affected, the limiting effect can be achieved, and overload protection can be carried out on the elastic body.

Description

Technical Field

[0001] The utility model relates to the technical field of weighing modules, in particular to a high-precision weighing module. Background Art

[0002] The weighing sensor, also known as the weighing module, is the core component of the electronic weighing and measuring equipment. It is installed on the ground through the base at the bottom. Its working principle is that when a heavy object passes through the upper pressure head or is directly placed on the upper pressure head, the elastic body under the upper pressure head is deformed, and the resistance value of the strain gauge set in the strain hole of the elastic body changes accordingly, and outputs a corresponding electrical signal when the resistance value changes. Finally, it is collected by the instrument and converted into intuitively identifiable weight information of the weighing object.

[0003] Existing weighing sensor modules, such as Figure 1 As shown, the elastomer is inserted between the connecting member and the baffle, and the pressure plate is arranged on the connecting member. In this structure, the elastomer is inserted between the connecting member and the baffle. When there is a heavy object on the upper pressure plate, the elastomer is squeezed and deformed under the action of the connecting member and the baffle. However, when the connecting member and the baffle squeeze the elastic member, the contact area with the elastomer is large, so that the measurement sensitivity is reduced, thereby affecting the weighing accuracy. Therefore, it is necessary to propose a high-precision weighing module. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a high-precision weighing module which can improve weighing accuracy by reducing the contact area.

[0005] To achieve the above technical objectives, the utility model proposes the following technical solutions: a high-precision weighing module, wherein a leveling mechanism is provided at the bottom of the lower pressure plate, and a sensor assembly is arranged between the lower pressure plate and the upper pressure plate, and the sensor assembly includes an elastomer, a bearing hole and a mounting hole, the bearing hole is opened in the middle of the elastomer, and there are two mounting holes, which are respectively opened at both ends of the elastomer, and the upper pressure plate is installed on the top of the elastomer through a connecting piece, and the connecting piece includes two connecting plates arranged in parallel at the bottom of the upper pressure plate, and the connecting plate is connected to the elastomer through a bearing shaft passing through the bearing hole, and both ends of the top of the lower pressure plate are provided with a U-shaped support frame, and both ends of the elastomer are respectively connected to the support frame through a pin shaft passing through the mounting hole.

[0006] Furthermore, the cross section of the portion of the bearing shaft inserted into the bearing hole is a fan-shaped structure with the center facing downward, and the cross section of the portion of the pin shaft inserted into the mounting hole is a fan-shaped structure with the center facing upward.

[0007] Furthermore, a protective plate is provided on the top of the support frame, the protective plate is connected to the upper pressure plate through a limiting rod, the bottom of the limiting rod is connected to the lower pressure plate, the top of the limiting rod is connected to the upper pressure plate, a circular hole is opened on the upper pressure plate for the upper end of the limiting rod to pass through, the top of the limiting rod passes through the circular hole of the upper pressure plate through a clearance fit and is fixed by a first locking nut, and a second locking nut is connected to the limiting rod and located below the upper pressure plate.

[0008] Furthermore, the leveling mechanism includes a base plate, which is connected to the lower pressure plate via limiting screws on all sides, and limiting nuts are connected to the limiting screws and at both upper and lower ends of the lower pressure plate.

[0009] Furthermore, a plurality of mounting holes are provided on the lower pressing plate and the upper pressing plate.

[0010] Compared with the prior art, the beneficial effects produced by the utility model are: the utility model has a novel structure, ingenious conception, simple and convenient operation, and has the following advantages compared with the prior art: the utility model forms a shear force on the elastomer through the fan-shaped structure bearing shaft, and the bearing hole and the bearing shaft are in point contact, so the pressure transmission effect can be increased, the sensitivity can be improved, and the weighing accuracy can be significantly improved; through the mutual cooperation of structures such as the protection plate and the limit rod, it does not affect the force on the sensor, but can also play a limiting role and protect the elastomer from overload; the leveling mechanism can maintain the balance of the weighing module, further ensuring the weighing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the prior art;

[0012] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0014] Figure 4 It is a structural schematic diagram of the load-bearing shaft of the utility model.

[0015] In the figure, 1, lower pressure plate; 2, upper pressure plate; 3, sensor assembly; 301, elastomer; 302, bearing hole; 303, mounting hole; 304, bearing shaft; 305, mounting shaft; 4, connecting piece; 401, connecting plate; 5, support frame; 6, leveling mechanism; 601, bottom plate; 602, limiting screw; 603, limiting nut; 7, protection plate; 8, limiting rod; 9, first locking nut; 10, second locking nut; 11, fixing hole. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0017] like Figure 2-4 As shown, the utility model provides a high-precision weighing module, including a lower pressing plate 1, an upper pressing plate 2 and a sensor assembly 3, wherein a leveling mechanism 6 is provided at the bottom of the lower pressing plate 1, and the sensor assembly 3 is arranged between the lower pressing plate 1 and the upper pressing plate 2, and the sensor assembly 3 includes an elastic body 301, a bearing hole 302 and a mounting hole 303, wherein the bearing hole 302 is arranged in the middle of the elastic body 301, and there are two mounting holes 303, which are respectively arranged at both ends of the elastic body 301, and the upper pressing plate 2 is installed on the top of the elastic body 301 through a connecting piece 4, and the connecting piece 4 is provided on the upper pressing plate 2. The connecting member 4 includes two connecting plates 401 arranged in parallel at the bottom of the upper pressure plate 2, and the connecting plates 401 are connected to the elastic body 301 through a load-bearing shaft passing through the load-bearing hole. Both ends of the top of the lower pressure plate 1 are provided with a U-shaped support frame 5, and both ends of the elastic body 301 are respectively connected to the support frame 5 through a pin shaft 305 passing through the mounting hole 303. The cross-section of the part of the load-bearing shaft 304 inserted into the load-bearing hole 302 is a fan-shaped structure with the center of the circle facing downward, and the cross-section of the part of the pin shaft 305 inserted into the mounting hole 303 is a fan-shaped structure with the center of the circle facing upward.

[0018] like Figure 2 As shown, the weighing module of the utility model is a double shear beam structure. When weighing, the output signal of the weighing module with the double shear beam structure has the characteristic of high precision, so the accuracy of the weighing result can be ensured; the elastic body 301 is a rectangular parallelepiped structure, and the two ends of the elastic body 301 are fixed to the support frame 5 through the installation shaft 305. There is a certain gap between the two side surfaces of the end of the elastic body 301 and the support frame 5, and between the two side surfaces of the middle part of the elastic body 301 and the connecting plate 401, which can avoid affecting the force of the elastic body 301. One end of the two connecting plates 401 is fixed to the bottom of the upper pressing plate 2. The load-bearing shaft 304 installs the upper pressure plate 2 on the top of the elastomer 301, and the load-bearing shaft 302 is limited between the two connecting plates 401. When the upper pressure plate 2 moves downward, the load-bearing shaft 304 can press the elastomer 301 downward with the connecting plate 401, that is, the load-bearing shaft 304 presses the bottom of the load-bearing hole 302. At the same time, the mounting hole 303 moves downward with the elastomer 301 and conflicts with the pin shaft 305. The load-bearing shaft 304 forms a double shear on the elastomer 301. Compared with the prior art, there is no baffle at the bottom of the connecting plate 401, so there is no friction between the baffle and the elastomer 301, which improves the weighing accuracy of the elastomer 301.

[0019] The cross section of the portion of the bearing shaft 304 inserted into the bearing hole 302 is a fan-shaped structure with the center of the circle facing downward, and the cross section of the portion of the pin shaft 305 inserted into the mounting hole 303 is a fan-shaped structure with the center of the circle facing upward.

[0020] like Figure 3 and 4 As shown, the bearing shaft 304 and the pin shaft 305 of the fan-shaped structure are respectively in the bearing hole 302 and the mounting hole 303. The bearing shaft 304 and the bearing hole 302 are in point contact, and the pin shaft 305 and the mounting hole 303 are also in point contact, so the weighing accuracy can be further improved.

[0021] The top of the support frame 5 is provided with a protective plate 7, the protective plate 7 is connected to the upper pressure plate 2 through a limiting rod 8, the bottom of the limiting rod 8 is connected to the lower pressure plate 1, the top of the limiting rod 8 is connected to the upper pressure plate 2, and a circular hole is opened on the upper pressure plate 2 for the upper end of the limiting rod 8 to pass through. The top of the limiting rod 8 passes through the circular hole of the upper pressure plate 2 through a clearance fit and is fixed by a first locking nut 9. A second locking nut 10 is connected to the limiting rod 8 and is located below the upper pressure plate 2.

[0022] like Figure 2 As shown, in the present embodiment, there is a certain gap between the top of the elastic body 301 and the bottom of the upper pressure plate 2. When the upper pressure plate 2 is subjected to uneven force, the upper pressure plate 2 tilts. Since the limiting rod 8 and the circular hole on the upper pressure plate 2 are connected with a gap, the bottom of the upper pressure plate 2 does not contact the top of the elastic body 301 when it tilts, which neither affects the force on the sensor nor plays a limiting role. When the upper pressure plate 2 is overloaded with a heavy object, the elastomer 301 can be protected from overload by the second locking nut 10.

[0023] The leveling mechanism 6 includes a bottom plate 601 , which is connected to the lower pressing plate 1 via limiting screws 602 . Limiting nuts 603 are connected to the limiting screws 602 and to the upper and lower ends of the lower pressing plate 1 .

[0024] like Figure 2 As shown, if the installation ground is uneven, the utility model can ensure the balance of the weighing module by adjusting the position of the limit nut 603.

[0025] A plurality of fixing holes 11 are provided on the lower pressing plate 1 and the upper pressing plate 2 .

[0026] like Figure 2 As shown, the fixing holes 11 on the lower pressing plate 1 are used to connect the lower pressing plate 1 to a fixing member, such as the ground, and the fixing holes 11 on the upper pressing plate 2 are used to connect to the bottom of a load-bearing member, such as a mixer support leg.

[0027] Principle of use: When the weighing module of the utility model is weighing, the upper pressure plate 2 drives the connecting piece 4 and the bearing shaft 304 to press down at the same time, and the bearing shaft 304 presses down the elastic body 301 in the bearing hole 302, and then transmits the gravity of the heavy object to the elastic body 301 through the bearing shaft 304. Based on the double shear beam structure, the elastic body 301 is deformed by the shear force of the bearing shaft 304 and the mounting shafts 305 at both ends. Under the action of the shear force, shear stress is generated inside the elastic body 301. Under the action of the tensile stress and compressive stress caused by the shear stress, the strain gauge resistance of the strain gauge of the elastic body 301 changes, and outputs the corresponding electrical signal, which is finally collected by the instrument and converted into the weight information of the weighing object that can be intuitively identified.

[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-precision weighing module, comprising a lower pressing plate (1), an upper pressing plate (2) and a sensor assembly (3), characterized in that: A leveling mechanism (6) is provided at the bottom of the lower pressing plate (1). The sensor assembly (3) is arranged between the lower pressing plate (1) and the upper pressing plate (2). The sensor assembly (3) comprises an elastic body (301), a bearing hole (302) and a mounting hole (303). The bearing hole (302) is arranged in the middle of the elastic body (301). There are two mounting holes (303), which are respectively arranged at two ends of the elastic body (301). The upper pressing plate (2) is mounted on the top of the elastic body (301) via a connecting member (4). The connecting member (4) comprises two connecting plates (401) arranged in parallel at the bottom of the upper pressing plate (2). The connecting plates (401) are connected to the elastic body (301) via a bearing shaft (304) passing through the bearing hole (302). Both ends of the top of the lower pressing plate (1) are provided with a U-shaped support frame (5). Both ends of the elastic body (301) are respectively connected to the support frame (5) via a pin shaft (305) passing through the mounting hole (303).

2. A high-precision weighing module according to claim 1, characterized in that: The cross section of the portion of the bearing shaft (304) inserted into the bearing hole (302) is a fan-shaped structure with the center of the circle facing downward, and the cross section of the portion of the pin shaft (305) inserted into the mounting hole (303) is a fan-shaped structure with the center of the circle facing upward.

3. A high-precision weighing module according to claim 1, characterized in that: The top of the support frame (5) is provided with a protective plate (7), the protective plate (7) is connected to the upper pressure plate (2) via a limiting rod (8), the bottom of the limiting rod (8) is connected to the lower pressure plate (1), the top of the limiting rod (8) is connected to the upper pressure plate (2), a circular hole is provided on the upper pressure plate (2) for the upper end of the limiting rod (8) to pass through, the top of the limiting rod (8) passes through the circular hole of the upper pressure plate (2) through a clearance fit and is fixed by a first locking nut (9), and a second locking nut (10) is connected to the limiting rod (8) and located below the upper pressure plate (2).

4. A high-precision weighing module according to claim 3, characterized in that: The leveling mechanism (6) comprises a base plate (601), the four sides of which are connected to the lower pressing plate (1) via limiting screws (602), and limiting nuts (603) are connected to the limiting screws (602) and located at both the upper and lower ends of the lower pressing plate (1).

5. A high-precision weighing module according to claim 4, characterized in that: A plurality of fixing holes (11) are provided on the bottom plate (601) and the upper pressing plate (2).

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