Integrated two-column weighing sensor

Abstract

An integrated two-column weighing sensor comprises a sensor, an upper pressure head, a steel ball and a bottom plate, the sensor comprises an upper bearing end, a lower fixing end and an elastic body, and the integrated two-column weighing sensor is characterized in that the elastic body adopts a double-column structure, the upper bearing end and the lower fixing end are rectangular, and the double columns are arranged between the upper bearing end and the lower fixing end in a left-right opposite mode; the elastic body, the upper bearing end and the lower fixing end form an integrated piece, four side surfaces of the elastic body in the double columns are respectively provided with a strain gauge, the four strain gauges are mutually connected to form a Wheatstone bridge, and two independent Wheatstone bridges of the double columns are connected in parallel to form a detection signal output end; the device is simple and reasonable in structure, convenient to process, low in cost, good in lateral and unbalance loading resistance, high in adaptability, high in measurement precision and suitable for batch production.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of weighing devices, specifically to a kind of integrated two stand column weighing sensor, suitable for electronic truck scale, track scale, tank scale and other electronic weighing equipment. BACKGROUND

[0002] At present, columnar sensor is widely used in various electronic weighing equipment such as truck scale, track scale, axle scale and tank scale. Columnar sensor generally includes upper and lower pressure heads, upper and lower mounting plates, lateral tie rods and other connecting parts. Columnar sensor has compact structure, stable and reliable performance, excellent dynamic response performance, and is very suitable for making high-precision sensors. However, the existing columnar sensor has poor resistance to lateral and eccentric load, is sensitive to changes in loading point, has high installation requirements, and has defects such as difficult to manufacture, high cost and insufficient precision, which is not conducive to mass production.

[0003] According to investigation, the existing Chinese utility model patent No. CN202410623785.1 "double-column bridge type weighing sensor" includes a sensor, an upper pressure head, a steel ball and a bottom plate. The sensor includes an elastic body and a strain gauge. The elastic body is an integrated part composed of an upper bearing end, a double column body and a lower fixed end. The double column body is symmetrically arranged between the upper bearing end and the lower fixed end. Each column body in the double main body is provided with a central hole for placing the strain gauge. Four strain gauges are arranged in the central hole and connected to each other on a Wheatstone bridge. The two independent Wheatstone bridges of the double column body form a double-bridge structure. Although the precision of this sensor is improved, it is still not ideal, and the structure is also difficult to manufacture and process. SUMMARY

[0004] The utility model provides a kind of integrated two stand column weighing sensor for the above technical status, with the characteristics of high measurement precision and low cost.

[0005] The utility model solves the above technical problems by the technical scheme of a kind of integrated two stand column weighing sensor, including sensor, upper pressure head, steel ball and bottom plate, sensor includes upper bearing end, lower fixed end and elastic body, characterized in that: the elastic body adopts double-column structure, and the upper bearing end and the lower fixed end are both rectangular, and the double columns are arranged left and right relative to each other between the upper bearing end and the lower fixed end, and the elastic body and the upper bearing end and the lower fixed end form an integrated part, four sides of the elastic body in the double column are respectively installed strain gauge, four strain gauges are connected to each other to form a Wheatstone bridge, and the two independent Wheatstone bridges of the double column are connected in parallel to form the output end of detection signal.

[0006] Further, the double columns are two rectangular columns arranged symmetrically left and right, and the outer extending arc surfaces around the upper and lower ends of the double column body are connected with the upper end surface of the upper bearing end and the lower end surface of the upper fixed end.

[0007] Further, a steel ball is arranged between the upper bearing end and the upper pressing head, and the upper end surface of the upper bearing end and the lower end surface of the upper pressing head are respectively concavely provided with a spherical surface for abutting against and facilitating rolling of the steel ball.

[0008] Further, a shroud is arranged above the upper bearing end for limiting the steel ball, the shroud has a circular cross section, a spherical surface hole is arranged in the middle of the shroud for cooperating with the spherical surface of the upper bearing end, the shroud is sleeved on the upper end of the upper bearing end, and the spherical surface of the spherical surface hole of the shroud cooperates with the spherical surface to form a ball socket structure for accommodating the lower part of the steel ball.

[0009] Further, a positioning groove is arranged in the middle of the lower end surface of the shroud for cooperating with the upper bearing end, and connecting holes are respectively arranged on the front and rear lower sides of the shroud, and corresponding positioning holes are respectively arranged on the front and rear sides of the upper bearing end, the shroud is sleeved on the upper end of the upper bearing end through the positioning groove, and the shroud is connected and fixed to the upper bearing end through screws passing through the front and rear connecting holes and the front and rear positioning holes.

[0010] Further, a sealing protective cover is sleeved on the sensor, the sealing protective cover has a hollow structure with a rectangular hole arranged on the upper and lower sides, the sensor is arranged in the sealing protective cover, and the upper bearing end is exposed outside the sealing protective cover, rectangular grooves are respectively arranged on the outer walls of the lower ends of the upper bearing end and the lower fixed end for cooperating with the upper and lower rectangular holes of the sealing protective cover, and the inner sides of the upper and lower rectangular holes of the sealing protective cover are provided with a fillet, and the sealing protective cover is integrally vulcanized and formed on the sensor by using rubber to achieve sealing connection.

[0011] Further, the bottom plate is a square plate, U-shaped mounting openings are respectively arranged on the front, rear, left and right sides of the bottom plate, a rectangular groove is transversely arranged in the middle of the upper end surface of the bottom plate for accommodating the lower end of the sensor, connecting counterbores are arranged in the rectangular groove corresponding to the positions of the double columns, and the bottom plate and the lower fixed end are fixed by bolts.

[0012] Finally, waterproof joints are arranged on the left and right sides of the upper bearing end.

[0013] Compared with the prior art, the advantages of the utility model lie in: the elastic body is designed as double column structure, double column structure can form double way wheatstone electric bridge, balance force arm signal, signal between two columns can be complementary, realize signal compensation to the signal of the influence of the bias load of sensor, stabilize data, guarantee product precision; the upper bearing end and the lower fixed end are designed as rectangle, processing is convenient, cost is low, beneficial to batch production; sensor bearing adopts upper pressure head and steel ball structure, can adapt to various domestic scale table structure, strong adaptability, impact resistance, and can automatic reset; the upper end of the upper bearing end is provided with a shield, and the steel ball is limited; the lower fixed end and the bottom plate are fixed through bolts, and the sensor is limited to rotate and move 360 degrees in front, back, left and right; the sensor is externally provided with a sealing protective cover, and the measurement accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structure schematic view of the utility model embodiment;

[0015] Figure 2 It is Figure 1 longitudinal section view;

[0016] Figure 3 Figure 1 exploded view of

[0017] Figure 4 It is a structure schematic view of the sensor

[0018] Figure 5 It is Figure 4 top view;

[0019] Figure 6 It is a structure schematic view of the upper pressure head;

[0020] Figure 7 It is a structure schematic view of the bottom plate;

[0021] Figure 8 It is a structure schematic view of the shield;

[0022] Figure 9 It is Figure 8 top view. DETAILED DESCRIPTION

[0023] The utility model will be further described in detail in combination with the drawings.

[0024] For example Figures 1-9As shown, a one-piece two-column weighing sensor includes a sensor 1, an upper pressing head 2, a steel ball 4 and a bottom plate 3. The sensor 1 includes an upper bearing end 11, a lower fixed end 13 and an elastic body 12 therebetween. The elastic body 12 adopts a double-column structure. The upper bearing end 11 and the lower fixed end 13 are both rectangular. The double columns 12 are symmetrically arranged left and right between the upper bearing end 11 and the lower fixed end 13. The elastic body 12 and the upper bearing end 11 and the lower fixed end 12 form an integral piece. Four sides of the elastic body 12 in the double column are respectively provided with strain gauges. The four strain gauges are connected to each other to form a Wheatstone bridge. Two independent Wheatstone bridges of the double column are connected in parallel to form a detection signal output end.

[0025] Specifically, the double column has two elastic bodies 12 in the shape of rectangular columns. The upper and lower ends of the double column are provided with outwardly extending arc-shaped surfaces around the four sides, which are connected to the upper end surface of the upper bearing end 11 and the lower end surface of the upper fixed end 13. A steel ball 4 is arranged between the upper bearing end 11 and the upper pressing head 2. The upper end surface of the upper bearing end 11 and the lower end surface of the upper pressing head 2 are respectively provided with spherical surfaces 111 and 21, which are in contact with the steel ball 4 and facilitate the rolling of the steel ball 4. A protective cover 5 is arranged above the upper bearing end 11 to limit the steel ball 4. The protective cover 5 has a circular cross section. A spherical surface hole 51 is formed in the middle of the protective cover 5, which is matched with the spherical surface 11 of the upper bearing end 11. The protective cover 5 is sleeved on the upper end of the upper bearing end 11. The spherical surface of the spherical surface hole 51 of the protective cover 5 is connected to the spherical surface 111 to form a ball socket structure for the lower part of the steel ball 4. A positioning groove 52 is formed in the middle of the lower end surface of the protective cover 5, which is matched with the upper bearing end 11. Connection holes 53 are formed in the front and rear lower parts of the protective cover 5. Corresponding positioning holes 112 are formed in the front and rear sides of the upper bearing end 11. The protective cover 5 is sleeved on the upper end of the upper bearing end 11 through the positioning groove 52 and is connected and fixed to the upper bearing end 11 through screws passing through the front and rear connection holes 53 and the front and rear positioning holes 112.

[0026] The sensor 1 is sleeved with a sealing protective cover 6 which is integrally vulcanized, the sealing protective cover 6 is a hollow structure with a rectangular hole formed on the upper and lower parts, the sensor 1 is arranged in the sealing protective cover 6 and the upper bearing end 11 is exposed outside the sealing protective cover 6, the outer wall of the upper bearing end 11 and the lower fixed end 12 is respectively provided with a rectangular groove 10 matched with the upper and lower rectangular holes of the sealing protective cover 6, the sealing protective cover 6 is sleeved on the sensor 1 and is integrally vulcanized on the sensor 1, and sealing connection is achieved. The bottom plate 3 is a square plate, the front and rear sides and the left and right sides of the bottom plate 3 are respectively concavely provided with U-shaped mounting openings 31, the upper end surface of the bottom plate 3 is horizontally concavely provided with a rectangular groove 33 for inserting the lower end of the sensor 1, the connecting counterbores 32 are formed in the rectangular groove 33 and correspond to the positions of the double columns 12, the bottom plate 3 and the lower fixed end 13 are fixed by the bolts 8, so that the sensor 1 is fixed on the bottom plate 3 and the rotation and movement of the sensor 1 in the front and rear directions and the left and right directions are limited. The waterproof joints 7 are arranged on the left and right sides of the upper bearing end 11.

[0027] The specific structure in the sensor is consistent with the prior art, and will not be repeated here.

[0028] In the embodiment, the elastic body 12 is designed as a double column structure, the double column structure can form a double path Wheatstone bridge, balance the force arm signal, the signals between the two columns can be complementary, signal compensation for the influence of the eccentric load of the sensor 1 is realized, data is stabilized, and product precision is ensured; the upper bearing end 11 and the lower fixed end 13 are designed as rectangles, processing is convenient, cost is low, and batch production is beneficial; the sensor 1 adopts the upper pressure head 2 and the steel ball 4 structure, can adapt to various domestic scale table structures, has strong adaptability, is resistant to impact, and can be automatically reset; the upper end of the upper bearing end 11 is provided with the protective cover 5 for limiting the steel ball 4; the lower fixed end 13 and the bottom plate 3 are fixed by bolts, and the rotation and movement of the sensor 1 in the front and rear directions and the left and right directions are limited; the sealing protective cover 7 is arranged outside the sensor 1, and measurement precision is ensured. The utility model has the advantages of simple and reasonable structure, convenient processing, low cost, good resistance to lateral and eccentric load, strong adaptability and high measurement precision.

[0029] The sensor has the advantages of simple structure, easy manufacturing and low cost, and is suitable for batch production.

[0030] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary technical personnel in the technical field, some improvements and decorations can be made without departing from the technical principles of the utility model, and these improvements and decorations should also be regarded as the protection range of the utility model.

Claims

1. An integrated two-column load cell, comprising a sensor, an upper plunger, a steel ball and a base plate, the sensor comprising an upper load-bearing end, a lower fixed end and an elastomer, characterized in that: The elastic body adopts a double-column structure, the upper bearing end and the lower fixed end are rectangular, the double columns are oppositely arranged left and right between the upper bearing end and the lower fixed end, the elastic body and the upper bearing end and the lower fixed end form an integral piece, four sides of the elastic body in the double columns are respectively provided with strain gauges, the four strain gauges are connected to form a Wheatstone bridge, and the two independent Wheatstone bridges of the double columns are connected in parallel to form an output end of a detection signal.

2. The one-piece two-post load cell of claim 1, wherein: The double columns are two rectangular columns arranged symmetrically left and right, and the outer circumferences of the upper and lower ends of the double columns are outwardly extending arc surfaces connected with the upper end surface of the upper bearing end and the lower end surface of the upper fixed end.

3. The one-piece two-post load sensor of claim 2, wherein: 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 concavely provided with spherical surfaces abutting against the steel ball and facilitating rolling of the steel ball.

4. The one-piece two-post load sensor of claim 3, wherein: A protective cover is arranged above the upper bearing end for limiting the steel ball, the cross section of the protective cover is circular, a spherical surface hole is formed in the middle of the protective cover and matched with the spherical surface of the upper bearing end, the protective cover is sleeved on the upper end of the upper bearing end, and the spherical surface of the spherical surface hole of the protective cover is connected with the spherical surface to form a ball socket structure for placing the lower part of the steel ball.

5. The one-piece two-post load sensor of claim 4, wherein: A positioning groove is transversely formed in the middle of the lower end surface of the protective cover and matched with the upper bearing end, and connecting holes are respectively formed in the front and rear lower sides of the protective cover, corresponding positioning holes are respectively formed in the front and rear sides of the upper bearing end, the protective cover is sleeved on the upper end of the upper bearing end through the positioning groove and connected and fixed with the upper bearing end through screws passing through the front and rear connecting holes and the front and rear positioning holes.

6. The one-piece two-post load sensor of claim 5, wherein: A sealing protective cover is sleeved on the sensor, the sealing protective cover is a hollow structure with rectangular holes formed in the upper and lower sides, the sensor is arranged in the sealing protective cover and the upper bearing end is exposed outside the sealing protective cover, rectangular recesses are respectively formed in the outer walls of the upper bearing end and the lower fixed end and matched with the upper and lower rectangular holes of the sealing protective cover, and the sealing protective cover is integrally vulcanized and formed on the sensor by rubber to achieve sealing connection.

7. The one-piece two-post load sensor of any of claims 1-6, wherein: The bottom plate is a square plate, U-shaped mounting openings are respectively formed in the front, rear, left and right sides of the bottom plate, a rectangular slot is transversely formed in the middle of the upper end surface of the bottom plate and matched with the lower end of the sensor, connecting counterbores are respectively formed in the rectangular slot and positions of the double columns, and the bottom plate and the lower fixed end are fixed by bolts.

8. The one-piece two-post load sensor of any of claims 1-6, wherein: Waterproof joints are arranged on the left and right sides of the upper bearing end.

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