Multi-column type column weighing sensor

Abstract

A multi-column type weighing sensor comprises a column type sensor, an upper pressure head and a bottom plate, the column type sensor comprises an upper bearing end, an elastic body and a lower fixing end, the elastic body is of a multi-column structure composed of a plurality of columnar elastic body units, and the elastic body units are symmetrically distributed or annularly and uniformly distributed at intervals. The upper end and the lower end of each elastomer unit are fixedly connected with the bottom face of the upper bearing end and the top face of the lower fixing end respectively, the strain gauges are installed on the four side faces of each elastomer unit respectively, the four strain gauges are connected in series to form a Wheatstone bridge, and the multiple Wheatstone bridges formed by the multiple elastomer units are connected in parallel to form an input and output end with a fixed value. The device is reasonable in structure, convenient to install, good in lateral and unbalance loading resistance, high in adaptability and high in measurement precision.

Description

Technical Field

[0001] The utility model relates to a weighing device, in particular to a multi-column column type weighing sensor, which is suitable for electronic weighing equipment such as electronic truck scales, track scales, material tank scales, etc. Background Art

[0002] At present, column sensors are widely used in various electronic weighing equipment such as various truck scales, track scales, axle weight scales, and tank scales. Column sensors generally include upper and lower pressure heads, upper and lower mounting plates, lateral pull rods and other connectors. Column sensors have a compact structure, stable and reliable performance, and excellent dynamic response performance, making them very suitable for making high-precision sensors. However, existing column sensors have poor lateral and eccentric load resistance, are sensitive to changes in loading points, have high installation requirements, and are cumbersome to adjust the four corners. They also have high requirements for the scale structure, such as large deformation of the scale steel plate and uneven foundation, which will affect the weighing accuracy and poor adaptability. The connection between the sensor and the load-bearing accessories is easily affected by impurities such as sand and gravel, resulting in a decrease in weighing accuracy.

[0003] After investigation, the existing Chinese utility model patent "Column weighing sensor" with patent number 200420020485.2 includes a column elastic body, a resistance strain gauge is fixed on the surface of the column elastic body, and the resistance strain gauge is composed of a certain Wheatstone bridge to output a voltage signal that changes with weight. A sleeve is fixed outside the column elastic body to protect the resistance strain gauge. The height-to-diameter ratio of the column elastic body is 2.5-4, and there are four resistance strain gauges, which are evenly pasted on the surface of the middle part of the column elastic body. This sensor overcomes the inherent defect of low measurement accuracy of column sensors, and achieves relatively high accuracy in linearity, lateral resistance, torsion resistance, azimuth error, etc., but it also has the defects of poor lateral resistance and eccentric load resistance. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a multi-column column weighing sensor with reasonable structure and convenient installation in view of the above technical status quo, which has the characteristics of strong anti-lateral and eccentric load capacity, strong adaptability and high measurement accuracy.

[0005] The first technical solution adopted by the utility model to solve the above technical problems is: a multi-column column weighing sensor, including a column sensor, an upper pressure head and a bottom plate, characterized in that: the column sensor includes an upper load-bearing end, an elastic body and a lower fixed end, the elastic body is a multi-column structure composed of a plurality of columnar elastic body units, the elastic body units are symmetrically or evenly distributed between the upper load-bearing end and the lower fixed end, the upper and lower ends of the elastic body units are respectively fixedly connected to the bottom surface of the upper load-bearing end and the top surface of the lower fixed end, strain gauges are respectively installed on the four sides of each elastic body unit, the four strain gauges are connected in series to form a Wheatstone bridge, and the multiple Wheatstone bridges formed by the multiple elastic body units are connected in parallel to form an input and output end with a fixed value.

[0006] As an improvement, the upper bearing end and the lower fixed end are both disc-shaped, the diameter of the lower fixed end is not less than the diameter of the upper bearing end, the elastomer unit is a rectangular column, there are 2 to 6 elastomer units, and the elastomer units are symmetrically distributed front to back and left to right with the center of the upper bearing end as the central axis, or evenly distributed in annular intervals.

[0007] Furthermore, the columnar sensor is covered with a protective sleeve, which is a hollow cylindrical structure with circular holes opened at the top and bottom. The columnar sensor is arranged in the protective sleeve, and the upper bearing end is exposed outside the protective sleeve. The lower circular hole of the protective sleeve abuts against the outer edge of the upper end surface of the lower fixed end, and the upper circular hole cooperates with the annular groove at the lower end of the outer wall of the upper bearing end, and the lower circular hole, the upper circular hole and the outer wall of the columnar sensor are welded and sealed.

[0008] Furthermore, a steel ball is provided between the upper bearing end and the upper pressure head, and the upper end surface of the upper bearing end and the lower end surface of the upper pressure head are respectively provided with spherical surfaces which abut against the steel ball and facilitate the rolling of the steel ball.

[0009] Furthermore, a shield for limiting the position of the steel ball is provided above the upper bearing end, a positioning disc with a reduced diameter is convexly provided on the upper end surface of the upper bearing end, a spherical surface is arranged in the middle of the positioning disc, a positioning circular groove is concavely provided on the lower end surface of the shield for the positioning disc to be inserted, a partial spherical surface cooperating with the spherical surface of the upper bearing end is arranged in the middle of the shield, the shield is arranged on the upper bearing end through the cooperation of the positioning circular groove and the positioning disc, and the partial spherical surface is connected with the spherical surface of the upper bearing end to form a ball socket structure for the lower part of the steel ball to be inserted.

[0010] Furthermore, the upper bearing end has a convex ball structure, the lower fixed end is disc-shaped, the diameter of the lower fixed end is not less than the diameter of the upper bearing end, the elastomer unit is a rectangular column, there are 2 to 6 elastomer units, and the elastomer units are symmetrically distributed front to back and left to right with the center of the upper bearing end as the central axis, or evenly distributed in annular intervals.

[0011] Furthermore, the protective sleeve is a hollow rectangular structure, and is made of a seamless steel tube or a corrugated tube or an integrally vulcanized rubber tube.

[0012] Finally, the base plate is a square plate with fixed mounting holes at the four corners, a fixing bolt hole at the bottom surface of the lower fixed end near the edge, and corresponding connecting countersunk holes on the base plate to fix the base plate to the lower fixed end by bolts.

[0013] Compared with the prior art, the advantages of the utility model are: the elastic body is designed as a multi-column structure, the multi-column structure can form a multi-channel Wheatstone bridge, balance the force arm signal, and the signals between the elastic body units can be complementary, so as to realize the signal compensation for the lateral and eccentric load effects of the sensor, stabilize the data, and ensure the product accuracy; the sensor bearing adopts an upper pressure head and steel ball structure, which can adapt to various domestic weighing platform structures, has strong adaptability, impact resistance, and can automatically reset; a protective cover is set at the upper end of the upper bearing end to limit the steel ball; the lower fixed end is fixed to the bottom plate by bolts, and the sensor is limited to rotate and move 360 ​​degrees forward, backward, left and right. The utility model has a reasonable structure, is easy to install, has good resistance to lateral and eccentric loads, and has strong adaptability and high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 It is a longitudinal cross-sectional view of Example 1 of the utility model;

[0016] Figure 3 This is an exploded view of Example 1 of the utility model;

[0017] Figure 4 Schematic diagram of the column sensor

[0018] Figure 5 for Figure 4 A top view of

[0019] Figure 6 Schematic diagram of the structure of the upper pressure head;

[0020] Figure 7 is a schematic diagram of the structure of the shield;

[0021] Figure 8 is a schematic diagram of the structure of the base plate;

[0022] Fig. 9 It is a longitudinal cross-sectional view of Embodiment 2 of the present utility model; DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] Example 1

[0025] like Figures 1 to 8 As shown, a multi-column column weighing sensor includes a column sensor 1, an upper pressure head 2, a protective sleeve 4 and a bottom plate 3. The column sensor 1 includes an upper bearing end 11, a lower fixed end 12 and an elastic body 13 arranged between the upper bearing end 11 and the lower fixed end 12. The elastic body 13 is a multi-column structure composed of a plurality of columnar elastic body units 131. The elastic body units 131 are symmetrically distributed front and back and left and right with the center of the upper bearing end 11 as the central axis, or are evenly distributed in annular intervals. The upper and lower ends of the elastic body units 131 are fixedly connected to the bottom surface of the upper bearing end 11 and the top surface of the lower fixed end 12 respectively. Strain gauges are respectively installed on the four sides of each elastic body unit 131. The four strain gauges are connected in series to form a Wheatstone bridge. The multiple Wheatstone bridges formed by the multiple elastic body units 131 are connected in parallel to form an input and output end with a fixed value.

[0026] The specific structure is as follows: the upper bearing end 11 and the lower fixed end 12 are both disc-shaped, the diameter of the lower fixed end 12 is not less than the diameter of the upper bearing end 11, the elastic body unit 131 is a rectangular column, there are 2 to 6 elastic body units 131, and in this embodiment, there are 4 elastic body units 131, which are evenly distributed front, back, left and right. The protective sleeve 4 is a hollow cylindrical structure with circular holes opened at the top and bottom. The columnar sensor 1 is arranged in the protective sleeve 4, and the upper bearing end 11 is exposed outside the protective sleeve 4. The side of the upper bearing end 11 is provided with a waterproof joint 10. The lower circular hole of the protective sleeve 4 is against the outer edge of the upper end surface of the lower fixed end 12, and the upper circular hole is matched with the annular groove 14 at the lower end of the outer wall of the upper bearing end 11, and the lower circular hole, the upper circular hole and the outer wall of the columnar sensor 1 are welded and sealed. A steel ball 5 is provided between the upper bearing end 11 and the upper pressure head 2. The upper end surface of the upper bearing end 11 and the lower end surface of the upper pressure head 3 are respectively provided with spherical surfaces 111 and 21 which abut against the steel ball 5 and facilitate the rolling of the steel ball. A shield 6 is provided above the upper bearing end 11 to limit the steel ball 5. The upper end surface of the upper bearing end 11 is provided with a convex positioning disc 112 with a reduced diameter. The spherical surface 111 is provided in the middle of the positioning disc 112. The lower end surface of the shield 6 is provided with a concave positioning circular groove 61 for the positioning disc 112 to be placed. The middle part of the shield 6 is provided with a partial spherical surface 62 which cooperates with the spherical surface 111 of the upper bearing end 11. The shield 6 is provided on the upper bearing end 11 through the cooperation of the positioning circular groove 61 and the positioning disc 112. The partial spherical surface 62 is connected with the spherical surface 111 of the upper bearing end 11 to form a ball socket structure with an opening facing upward. The lower part of the steel ball 5 is placed in the ball socket and can roll in the ball socket.

[0027] The protective sleeve 4 of this embodiment is a hollow rectangular parallelepiped structure, made of seamless steel pipe or corrugated pipe material or integrally vulcanized rubber pipe, which is more beautiful and has a good protective effect. The protective sleeve 4 can also be in other different shapes.

[0028] The bottom plate 3 of this embodiment is a square plate, and mounting holes 31 for fixing the weighing sensor are provided at the four corners of the bottom plate 3, and six fixing bolt holes 121 are evenly provided near the edge of the bottom surface of the lower fixing end 12, and six corresponding connecting countersunk holes 32 are provided on the bottom plate 3, and the bottom plate 3 and the lower fixing end 12 are fixed by bolts 7. In this way, the columnar sensor 1 is fixed on the bottom plate 3, and the columnar sensor 1 is restricted from rotating and moving 360 degrees forward, backward, left, and right.

[0029] The specific structure inside the columnar sensor 1 is consistent with the prior art and will not be described again here.

[0030] In this embodiment, the elastomer 13 is designed as a multi-column structure. The multi-column structure can form a multi-path Wheatstone bridge to balance the lever arm signal. The signals between the elastomer units 131 can be complementary, thereby realizing signal compensation for the lateral and offset load effects of the sensor, stabilizing the data, and ensuring product accuracy. The sensor is supported by an upper pressure head 2 and a steel ball 5 structure, which can adapt to various domestic weighing platform structures, has strong adaptability, is impact-resistant, and can automatically reset. A protective cover 6 is provided at the upper end of the upper bearing end 11 to limit the steel ball 5. A protective sleeve 4 is provided outside the columnar sensor 1, and the protective sleeve 4 is welded and sealed to the columnar sensor 1 to form an integrated protective structure, which is more beautiful and has a good protective effect.

[0031] Example 2

[0032] like Fig. 9 As shown, a multi-column column weighing sensor is different from Example 1 in that the upper bearing surface of the upper bearing end 11 uses a convex ball structure 13, that is, a partial spherical surface with an outward protrusion, instead of a steel ball structure, and the protective cover 6 can be omitted. The rest is similar to Example 1.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-column column weighing sensor, comprising a column sensor, an upper pressure head and a bottom plate, characterized in that: The columnar sensor includes an upper bearing end, an elastic body and a lower fixed end. The elastic body is a multi-column structure composed of a plurality of columnar elastic body units. The elastic body units are symmetrically or evenly distributed between the upper bearing end and the lower fixed end. The upper and lower ends of the elastic body units are respectively fixedly connected to the bottom surface of the upper bearing end and the top surface of the lower fixed end. Strain gauges are respectively installed on the four sides of each elastic body unit. The four strain gauges are connected in series to form a Wheatstone bridge. The multiple Wheatstone bridges formed by the multiple elastic body units are connected in parallel to form an input and output end with a fixed value.

2. The multi-column column type weighing sensor according to claim 1, characterized in that: The upper bearing end and the lower fixed end are both disc-shaped, the diameter of the lower fixed end is not less than the diameter of the upper bearing end, the elastic unit is a rectangular column, there are 2 to 6 elastic units, and the elastic units are symmetrically distributed front to back and left to right with the center of the upper bearing end as the central axis, or evenly distributed in annular intervals.

3. The multi-column column type weighing sensor according to claim 2, characterized in that: The column sensor is covered with a protective sleeve, which is a hollow cylindrical structure with circular holes at the top and bottom. The column sensor is arranged in the protective sleeve, and the upper bearing end is exposed outside the protective sleeve. The lower circular hole of the protective sleeve abuts against the outer edge of the upper end surface of the lower fixed end, and the upper circular hole cooperates with the annular groove at the lower end of the outer wall of the upper bearing end. The lower circular hole, the upper circular hole and the outer wall of the column sensor are welded and sealed.

4. The multi-column column type weighing sensor according to claim 3, characterized in that: A steel ball is arranged between the upper bearing end and the upper pressure head, and the upper end surface of the upper bearing end and the lower end surface of the upper pressure head are respectively provided with spherical surfaces which abut against the steel ball and facilitate the rolling of the steel ball.

5. The multi-column column type weighing sensor according to claim 4, characterized in that: A shield for limiting the position of the steel ball is provided above the upper bearing end, a positioning disc with a reduced diameter is convexly provided on the upper end surface of the upper bearing end, a spherical surface is arranged in the middle of the positioning disc, a positioning circular groove is concavely provided on the lower end surface of the shield for the positioning disc to be inserted, a partial spherical surface cooperating with the spherical surface of the upper bearing end is arranged in the middle of the shield, the shield is arranged on the upper bearing end through the cooperation of the positioning circular groove and the positioning disc, and the partial spherical surface is connected with the spherical surface of the upper bearing end to form a ball socket structure for the lower part of the steel ball to be inserted.

6. The multi-column column type weighing sensor according to claim 1, characterized in that: The upper bearing end has a convex ball structure, the lower fixed end is disc-shaped, the diameter of the lower fixed end is not less than the diameter of the upper bearing end, the elastic unit is a rectangular column, there are 2 to 6 elastic units, and the elastic units are symmetrically distributed front to back and left to right with the center of the upper bearing end as the central axis, or evenly distributed in annular intervals.

7. The multi-column column type weighing sensor according to any one of claims 3 to 5, characterized in that: The protective sleeve is a hollow rectangular parallelepiped structure, and is made of a seamless steel pipe or a corrugated pipe or an integrally vulcanized rubber pipe.

8. The multi-column column type weighing sensor according to any one of claims 1 to 6, characterized in that: The base plate is a square plate with fixed mounting holes at the four corners, a fixing bolt hole at the bottom surface of the lower fixed end near the edge, and corresponding connecting countersunk holes on the base plate, which are used to fix the base plate to the lower fixed end by bolts.

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