A stable self-resetting column weighing sensor

Abstract

The present invention discloses a stable self-resetting column weighing sensor, comprising an upper pressure head, a column elastic body and a base; a self-resetting structure is provided on the column elastic body, and the bottom of the self-resetting structure is connected to the base; the self-resetting structure comprises an elastic sleeve sleeved on the column elastic body, and the elastic force of the elastic sleeve can give the column elastic body a rapid reset after being subjected to an outward force at any angle, so that the column elastic body always maintains a vertical force center line with the upper pressure head and the base, thereby ensuring the accuracy of the weighing precision.

Description

Technical Field

[0001] The present invention relates to the technical field of column type weighing sensors, in particular to a stable self-resetting column type weighing sensor. Background Art

[0002] Column-type weighing sensors are used in large electronic scales due to their simple and compact structure, high rigidity, high natural frequency, and fast dynamic response. However, column-type weighing sensors are susceptible to overturning, tipping, or tilting of the column elastic body when subjected to external inclination or torsion during use, causing the column elastic body to deviate from the center of force of the base, thus affecting weighing accuracy or even failing to weigh. In the prior art, foreign countries have adopted the installation of a limit device to ensure that the upper pressure head is aligned with the base and the center line of the column elastic body to ensure weighing accuracy. However, the installation cost is high and the range of motion of the column elastic body is limited. Therefore, it is not widely used in China. To address the above problems, Chinese invention patent application number 201310065566.8 discloses an integrated self-resetting column-type weighing sensor. The automatic reset device is formed by providing a sealing rubber ring, a housing, and a damping device. The automatic reset device has the function of strongly self-resetting the column elastic body and preventing the column elastic body from excessive tilting, ensuring the rapid and strong reset of the column elastic body. However, this integral self-resetting column weighing sensor has many disadvantages. First, the top of the column elastic body is clamped in the upper pressure head, and the upper pressure head and the shell are sealed and pressed tightly with a sealing rubber ring. The bottom of the column elastic body and the shell are directly connected by a damping device composed of a bottom plate and an upper plate to prevent the column elastic body from tilting excessively. This structure is only a relatively flexible way to limit the column elastic body, and the elastic force of the sealing rubber ring and the damping device is weak. In large-scale weight-bearing weighing, it is impossible to give the column elastic body a corresponding rapid reset elasticity to the outward inclination force. force; at the same time, it causes high damage to the sealing rubber ring and the damping device; secondly, the sealing rubber ring and the damping device have irresistible oxidation damage and fracture toughness, so their effective service life is short, which can easily affect the weighing accuracy; if oxidation or fracture occurs, the weighing sensor as a whole will fail; thirdly, the invention is described as an integral self-resetting columnar weighing sensor, but its characteristic is that the dustproof and waterproof performance of the sealing rubber ring between the upper pressure head and the columnar elastic body is poor, and the sealing rubber ring is easily damaged and deformed, resulting in dust and water ingress, and the structure lacks integrity. Summary of the Invention

[0003] The present invention mainly solves the technical problems that the column elastic body in the existing column weighing sensor is easily tilted and displaced by external forces, resulting in low weighing accuracy, and the existing integral self-resetting column weighing sensor cannot be quickly reset and has a short effective life and overall sealing performance. The present invention thus provides a stable self-resetting column weighing sensor that has an elastic force that can match the outward inclination force at any angle to form a rapid reset, is damage-resistant, has a long effective service life and has strong overall sealing performance.

[0004] The technical solution adopted by the present invention to solve the above problems is: a stable self-resetting columnar weighing sensor, including an upper pressure head, a columnar elastic body and a base; a self-resetting structure is provided outside the columnar elastic body, and the bottom of the self-resetting structure is connected to the base; the self-resetting structure includes an elastic sleeve arranged outside the columnar elastic body, and its elastic force can give the columnar elastic body a rapid reset after being subjected to an outward force at any angle, so that the columnar elastic body always maintains a vertical force center line with the upper pressure head and the base, ensuring the accuracy of the weighing accuracy.

[0005] Preferably, the cross-section of the elastic sleeve is corrugated.

[0006] A further technical solution is that the self-resetting structure also includes an upper reset cover arranged on the top of the elastic sleeve, and the columnar elastomer passes through the upper reset cover and is compatible with the upper reset cover; thereby, the upper reset cover is used to limit the top of the columnar elastomer, thereby avoiding the columnar elastomer in the existing structure from being tilted into the housing of the weighing sensor by the outward force. What is particularly important is that although the upper reset cover limits the top of the columnar elastomer, the upper reset cover is connected to the elastic sleeve by welding, and does not jam the columnar elastomer, thereby achieving its natural tilt and reset after being subjected to the outward force, and the force center line of the columnar elastomer is always consistent and perpendicular to the upper pressure head and the base.

[0007] Preferably, a limiting hole is provided in the upper reset cover, and the limiting hole is turned upward to form a limiting hoop that matches the columnar elastic body.

[0008] A further technical solution is that the self-resetting structure also includes a lower shell sleeve arranged at the bottom of the elastic sleeve, and the lower shell sleeve is respectively connected to the elastic sleeve and the base by welding; the lower shell sleeve can provide support for the elastic sleeve when it is deformed after being tilted and squeezed by the columnar elastomer, thereby preventing the overall tilt of the columnar elastomer from being too large and causing it to tip over.

[0009] A further technical solution is that the bottom surface of the columnar elastomer is arranged with a curved convex surface in the middle and a flat structure on all sides; this structure avoids the problem that the bottom surface of the traditional columnar elastomer is a curved convex structure, which leads to the bottom being unable to support itself after being subjected to an outward force and the columnar elastomer toppling over as a whole, causing damage and failure; the flat structure arranged around the curved convex surface can provide support and has the effect of preventing the columnar elastomer from completely tipping over.

[0010] A further technical solution is that a force-bearing groove adapted to the bottom of the columnar elastic body is opened at the center of the base, and the columnar elastic body is symmetrically installed in the force-bearing groove; the displacement of the bottom of the columnar elastic body is limited and reset through the force-bearing groove.

[0011] Preferably, the bottom end of the columnar elastic body is provided with a circle of protruding limiting convex ring, which is adapted to the force groove. The cross-section of the limiting convex ring is an isosceles trapezoidal structure, which plays a limiting role and prevents the bottom end of the columnar elastic body from being stuck with the force groove.

[0012] Preferably, a limiting column is fixedly provided in the force-bearing groove, and a limiting groove is provided at the bottom end of the columnar elastic body corresponding to the limiting column to adapt to each other to prevent the columnar elastic body from rotating.

[0013] Preferably, the middle portion of the base protrudes upward to form a boss that matches the inner ring of the bottom of the elastic sleeve and the two are fixedly connected by welding.

[0014] Preferably, the elastic sleeve is integrally formed by a mold and is made of stainless steel 304 or 316L. In addition to the sealing, rust-proof and corrosion-resistant properties and high strength, the elastic force of the elastic sleeve is further enhanced by integrally forming the mold and using stainless steel 304 or 316L material, which can completely offset the outward tendency force exerted on the columnar elastomer, thereby effectively avoiding damage caused by any tilting and resetting deformation of the elastic sleeve, thereby ensuring that the columnar weighing sensor has a long effective service life.

[0015] Preferably, the top of the columnar elastic body is fitted in the upper pressure head and is sealed with a sealing ring.

[0016] The technical solution of the present invention further includes a junction box and a wire arranged outside the lower shell, one end of the wire passes through the junction box and is connected to the strain gauge in the elastic body, and the other end extends outside the junction box.

[0017] Compared with the prior art, the present invention has the following advantages: a self-resetting structure is arranged outside the columnar elastic body, and an elastic sleeve integrally formed by a mold of 304 or 316L stainless steel is respectively connected to the upper reset cover and the lower shell by welding. The strong elastic force of the elastic sleeve can completely offset the outward inclination force exerted on the columnar elastic body, so that the columnar elastic body can quickly and effectively reset itself after being tilted by the outward inclination force, and the damage caused by the tilting and reset deformation of the elastic sleeve can be avoided, thereby ensuring that the columnar weighing sensor has a long effective service life; at the same time, the bottom surface of the columnar elastic body is provided with an arc protrusion arranged with a plane structure around it, and a circle of protrusions is provided at the bottom end. The protruding limiting convex ring is matched and installed with the force-bearing groove provided in the center of the base to form an effective support, which has the function of stopping the columnar elastic body from completely tipping over, and further realizes the limiting and resetting of the bottom of the columnar elastic body after displacement; the present invention, through the structure of the upper reset cover, the elastic sleeve and the lower shell sleeve being connected to each other by welding from top to bottom, on the one hand, makes the columnar elastic body have a strong and rapid self-reset function, and avoids the columnar elastic body from tilting excessively and tipping over, thereby achieving accurate weighing at any time; on the other hand, its structure connected as a whole by welding has strong overall sealing, good waterproof and dustproof performance, ensuring that the columnar weighing sensor has a long effective service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 is a top view of the present invention;

[0020] Figure 3 yes Figure 2 AA cross-sectional view;

[0021] Figure 4 yes Figure 3 A-direction structure enlarged schematic diagram;

[0022] Figure 5 yes Figure 4 A magnified schematic diagram of the B-direction structure;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the self-resetting structure of the present invention;

[0024] Figure 7 is a top view of the self-resetting structure of the present invention;

[0025] Figure 8 yes Figure 7 AA cross-sectional view;

[0026] Figure 9 It is a schematic diagram of the three-dimensional structure of the base of the present invention;

[0027] Shown in the figure: 1. Upper pressure head, 1a. Sealing ring, 2. Columnar elastic body, 2a. Arc surface, 2b. Flat surface, 2c. Limiting convex ring, 21. Limiting groove, 3. Base, 3a. Force groove, 3b. Limiting column, 3c. Boss, 4. Self-resetting structure, 4a. Upper reset cover, 41. Limiting hole, 42. Limiting hoop, 4b. Elastic sleeve, 4c. Lower shell, 5. Junction box, 6. Wire. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0029] This embodiment is a stable self-resetting column weighing sensor, such as Figure 1 and Figure 2 As shown, it includes an upper pressure head 1, a columnar elastic body 2 and a base 3; Figure 1 and Figure 4 As shown, a self-resetting structure 4 is provided outside the columnar elastic body 2, wherein the bottom of the self-resetting structure 4 is connected to the base 3; Figure 4 As shown in FIG8 , the self-resetting structure 4 includes an elastic sleeve 4b sleeved on the outside of the columnar elastic body 2. The cross-sectional structure of the elastic sleeve 4b is corrugated, and its elastic force can give the columnar elastic body 2 a rapid reset after being subjected to an outward force at any angle, thereby achieving that the columnar elastic body 2 always maintains a vertical force center line with the upper pressure head 1 and the base 3, ensuring the accuracy of the weighing precision; more importantly, as Figure 1 and Figure 4 The self-resetting structure 4 shown also includes an upper reset cover 4a arranged on the top of the elastic sleeve 4b, and the column elastic body 2 passes through the upper reset cover 4a and is adapted to the upper reset cover 4a; thereby, the top of the column elastic body 2 is limited by the upper reset cover 4a, avoiding the column elastic body 2 being tilted into the housing of the weighing sensor by the outward inclination force in the existing structure. What is more important is that although the upper reset cover 4a limits the top of the column elastic body 2, the upper reset cover 4a is connected to the elastic sleeve 4b by welding, and does not jam the column elastic body 2, so that it can naturally tilt and reset after being subjected to the outward inclination force, and the force center line of the column elastic body 2 is always consistent and perpendicular to the upper pressure head 1 and the base 3; a limiting hole 41 is provided in the upper reset cover 4a, and the limiting hole 41 is turned upward to form a limiting hoop 42 that matches the column elastic body 2; further technical solutions, such as Figure 3 、 Figure 4 and Figure 5As shown, the self-resetting structure 4 also includes a lower shell sleeve 4c arranged at the bottom of the elastic sleeve 4b, and the lower shell sleeve 4c is respectively connected to the elastic sleeve 4b and the base 3 by welding; the lower shell sleeve 4c can provide support for the elastic sleeve 4b when it is deformed after being tilted and squeezed by the columnar elastic body 2, to prevent the overall tilt of the columnar elastic body 2 from being too large and causing it to fall over; a further technical solution, the bottom surface of the columnar elastic body 2 is a convex arc surface 2a in the middle and a structure of surrounding planes 2b is arranged; this structure avoids the problem that the bottom surface of the traditional columnar elastic body 2 is a convex arc surface 2a, which leads to the bottom being unable to support itself after being subjected to an outward force and the columnar elastic body 2 falling over as a whole, causing damage and failure; the structure arranged around the convex arc surface 2a and the surrounding planes 2b can provide support to stop the columnar elastic body 2 from completely falling over Tipping effect; a force groove 3a adapted to the bottom of the columnar elastic body 2 is opened at the center of the base 3, and the columnar elastic body 2 is symmetrically installed in the force groove 3a; the force groove 3a is used to limit and reset the displacement of the bottom of the columnar elastic body 2; the bottom end of the columnar elastic body 2 is provided with a circle of protruding limiting convex ring 2c, the limiting convex ring 2c is adapted to the force groove 3a, and the cross-section of the limiting convex ring 2c is an isosceles trapezoidal structure, which plays a limiting role and avoids the bottom end of the columnar elastic body 2 from being stuck with the force groove 3a; such as Figure 3 、 Figure 4 and Figure 9 As shown, a limiting column 3b is fixedly provided in the force groove 3a, and a limiting groove 21 is provided at the bottom end of the columnar elastic body 2 corresponding to the limiting column 3b to adapt to each other to prevent the columnar elastic body 2 from rotating; the middle part of the base 3 is raised upward to form a boss 3c that matches the inner circle of the bottom of the elastic sleeve 4b and is fixedly connected to each other by welding; Figure 6 、 Figure 7 and Figure 8 As shown, the elastic sleeve 4b is integrally formed by a mold and is made of stainless steel 304 or 316L. In addition to the sealing, rust-proof and corrosion-resistant properties and high strength of the integrally formed mold and the stainless steel 304 or 316L material, the elastic force of the elastic sleeve 4b is further enhanced, which can completely offset the outward tendency force on the columnar elastomer 2, thereby effectively avoiding damage caused by any tilting and resetting deformation of the elastic sleeve 4b, and ensuring that the columnar weighing sensor has a long effective service life; the top of the columnar elastomer 2 is mounted in the upper pressure head 1, and they are sealed with a sealing ring 1a; the technical solution of the present invention also includes a junction box 5 and a wire 6 arranged outside the lower shell 4c, one end of the wire 6 passes through the junction box 5 and is connected to the strain gauge in the columnar elastomer 2, and the other end extends outside the junction box 5.

[0030] The working principle of the present invention is as follows: when weighing, a self-resetting structure 4 is set outside the columnar elastic body 2. The elastic sleeve 4b is formed by a 304 or 316L stainless steel mold and connected to the upper reset cover 4a and the lower shell 4c by welding. The strong elastic force of the elastic sleeve 4b with a corrugated structure can completely offset the outward inclination force on the columnar elastic body 2, so that the columnar elastic body 2 can quickly and effectively reset itself after being tilted by the outward inclination force, and avoid damage caused by the tilting and reset deformation of the elastic sleeve 4b, ensuring that the columnar weighing sensor has a long effective service life; at the same time, the bottom surface of the columnar elastic body 2 is provided with an arc surface 2a protruding from the surrounding flat surface 2b and a circle of protrusions is provided at the bottom end. The limiting convex ring 2c is installed in correspondence with the force-bearing groove 3a provided in the center of the base to form an effective support, which has the function of stopping the columnar elastic body 2 from completely tipping over, and further realizes the limiting and resetting of the bottom of the columnar elastic body 2 after displacement; the present invention, through the structure in which the upper reset cover 4a, the elastic sleeve 4b and the lower shell sleeve 4c are connected to each other by welding from top to bottom, on the one hand, makes the columnar elastic body 2 have a strong and rapid self-reset function, and avoids the columnar elastic body 2 from excessive tilting and tipping over, thereby achieving accurate weighing at any time; on the other hand, its structure connected as a whole by welding has strong overall sealing, good waterproof and dustproof performance, ensuring that the columnar weighing sensor has a long effective service life.

[0031] The above embodiments and descriptions are only for explaining the principles and best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, which shall fall within the scope of the invention to be protected.

Claims

1. A stable self-resetting column type weighing sensor, comprising an upper pressure head (1), a column type elastic body (2) and a base (3); characterized in that: A self-resetting structure (4) is provided on the outside of the columnar elastic body (2) and is respectively connected to the upper pressure head (1) and the base (3); the self-resetting structure (4) includes an elastic sleeve (4b) sleeved on the outside of the columnar elastic body (2); the self-resetting structure (4) also includes an upper reset cover (4a) provided on the top of the elastic sleeve (4b); the columnar elastic body (2) passes through the upper reset cover (4a) and is adapted to the upper reset cover (4a); a limiting hole (41) is provided in the upper reset cover (4a); the limiting hole (41) is turned upward to form a limiting hoop (42) that matches the columnar elastic body (2); the self-resetting structure (4) also includes a lower shell (4c) provided at the bottom of the elastic sleeve (4b); the lower shell (4c) is respectively connected to the elastic sleeve (4b) and the base (3) by welding.

2. The stable self-resetting column type weighing sensor according to claim 1, characterized in that: The bottom surface of the columnar elastic body (2) is arranged in a structure with a protruding central arc surface (2a) and surrounding flat surfaces (2b).

3. The stable self-resetting column type weighing sensor according to claim 1, characterized in that: A stress-bearing groove (3a) adapted to the bottom of the columnar elastic body (2) is provided at the center of the base (3), and the columnar elastic body (2) is symmetrically installed in the stress-bearing groove (3a).

4. The stable self-resetting column type weighing sensor according to claim 3, characterized in that: The bottom end of the columnar elastic body (2) is provided with a circle of protruding limiting convex rings (2c), the limiting convex rings (2c) are adapted to the force-bearing grooves (3a), and the cross section of the limiting convex rings (2c) is an isosceles trapezoidal structure.

5. The stable self-resetting column type weighing sensor according to claim 4, characterized in that: A limiting column (3b) is fixedly arranged in the force-bearing groove (3a), and a limiting groove (21) is provided at the bottom end of the columnar elastic body (2) corresponding to the limiting column (3b), and they are adapted to prevent the columnar elastic body (2) from rotating.

6. The stable self-resetting column type weighing sensor according to any one of claims 1 to 5, characterized in that: The middle portion of the base (3) protrudes upward to form a boss (3c) that matches the inner ring of the bottom of the elastic sleeve (4b), and the two are fixedly connected by welding.

7. The stable self-resetting column type weighing sensor according to claim 6, characterized in that: The elastic sleeve (4b) is integrally formed using a mold, and the elastic sleeve (4b) is made of stainless steel 304 or 316L.

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