Double-column bridge type weighing sensor

Abstract

A double-column bridge type weighing sensor comprises a sensor, an upper pressure head, a steel ball and a bottom plate, the sensor comprises an elastic body and a strain gauge, the elastic body is an integrated piece composed of an upper bearing end, double columns and a lower fixing end, and the double columns are symmetrically arranged between the upper bearing end and the lower fixing end. Each single column body in the double main bodies is provided with a center hole for placing the strain gauges, the four strain gauges are arranged in the center holes and are mutually connected and located on one Wheatstone bridge, and the two independent Wheatstone bridges of the double column bodies form a double-bridge circuit structure. The sensor is reasonable in structure and convenient to install, overcomes the defect that a traditional column type sensor is low in congenital measurement precision, has good unbalance loading resistance, impact resistance and azimuth error resistance, has the advantages of a bridge type sensor, and is stable and reliable in performance, excellent in dynamic response performance, capable of achieving self-resetting, high in adaptability and high in measurement precision.

Description

Technical Field

[0001] The utility model relates to a weighing device, in particular to a double-column bridge 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 truck scales, track scales, axle weight scales, tank scales, etc. Bridge sensors have large force values, anti-eccentric loads, and the combined pressure head has the characteristics of self-reset and center adjustment. The performance is stable and reliable, the dynamic response performance is excellent, and the adaptability is strong.

[0003] The existing bridge type sensor is connected to the base by large bolts. Fig.10 , 11 As shown in the figure, the biggest drawback of this type of bridge sensor is that the accuracy of the sensor is too dispersed and the stability is not ideal. If the fixing bolts become loose after long-term use, the product accuracy will decrease. In addition, since the existing bridge sensor adopts a split structure, there are technical problems such as low processing accuracy and complex product assembly.

[0004] After investigation, the existing Chinese utility model patent number CN231197294U, "A bridge sensor and scale body", includes a columnar elastic body, a bottom beam and a base, a strain gauge is arranged in the elastic body, a connecting layer is arranged between the elastic body and the bottom beam, the connecting layer fixes the elastic body and the bottom beam, the base is fixed to the end of the bottom beam away from the elastic body, the top of the elastic body is equipped with a swing component, the swing component is used to contact the external scale body, and the elastic body is equipped with a signal component for connecting the signal of the external measuring instrument. This sensor maintains the structure of the traditional bridge sensor, which is simple and convenient to install and use, and has relatively few installation conditions, but the sensor and the base are also fastened with bolts, and the above-mentioned technical problems also exist. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a double-column bridge weighing sensor with simple and reasonable structure, convenient processing and easy assembly in view of the above-mentioned technical status quo, which has the characteristics of anti-eccentric load, anti-impact, strong adaptability and high measurement accuracy.

[0006] The first technical solution adopted by the utility model to solve the above technical problems is: a double-column bridge weighing sensor, including a sensor, an upper pressure head, a steel ball and a bottom plate, the sensor including an elastomer and a strain gauge located on the elastomer, characterized in that: the elastomer is an integral part consisting of an upper bearing end, a double column and a lower fixed end, the double column is symmetrically arranged between the upper bearing end and the lower fixed end, the single column in the double body is provided with a central hole for inserting the strain gauge, four strain gauges are arranged in the central hole, and are interconnected and located on a Wheatstone bridge, and the two independent Wheatstone bridges of the double column form a double bridge structure.

[0007] As an improvement, the double columns are two rectangular columns symmetrically arranged on the left and right, and the upper and lower ends of the double columns are fixedly connected to the bottom surface of the upper load-bearing end and the top surface of the lower fixed end respectively, and the front, back, left and right sides of the double columns are flush with the upper load-bearing end and the lower fixed end. The left and right sides of the double columns where they are connected to the upper load-bearing end and the lower fixed end are concave with penetrating strip grooves, and a penetrating "I"-shaped slot hole is formed between the two columns, thereby forming the upper load-bearing end, the double columns and the lower fixed end.

[0008] Furthermore, the “I”-shaped slot hole is machined or wire-cut to adjust the size structure of the slot to correct the product accuracy.

[0009] 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.

[0010] Furthermore, a shield for limiting the position of the steel ball is provided above the upper bearing end. The cross-section of the shield is square, and a partial ball hole matching the spherical surface of the upper bearing end is opened through the middle of the shield. The shield positioning sleeve is arranged at the upper end of the upper bearing end, and the partial ball hole of the arc surface of the shield is connected with the spherical surface to form a ball socket structure for the lower part of the steel ball to be placed.

[0011] Furthermore, a positioning groove is recessed in the middle of the lower end of the shield and runs through the left and right sides for the upper end of the upper bearing end to be placed in. The shield is sleeved on the upper end of the upper bearing end through the positioning groove.

[0012] Finally, the base plate is a square plate, with fixed installation holes at the four corners of the base plate, fixing bolt holes at the four corners of the bottom surface of the lower fixed end, corresponding connecting countersunk holes on the base plate, and the base plate is fixed to the lower fixed end by bolts. Waterproof joints are provided on the left and right sides of the lower fixed end.

[0013] Compared with the prior art, the advantages of the utility model are: the elastic body is designed as a double-column bridge 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, realize the signal compensation for the sensor's eccentric load effect, stabilize the data, and ensure the product accuracy; the sensor bearing adopts an upper pressure head and a steel ball structure, which can adapt to various domestic weighing platform structures, has strong adaptability, is impact-resistant, 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 and is easy to install. It overcomes the inherent defect of low measurement accuracy of traditional column sensors, has good resistance to eccentric load, impact, and azimuth error, and has the advantages of bridge sensors, stable and reliable performance, excellent dynamic response performance, self-reset, strong adaptability, and high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0015] Figure 2 for Figure 1 A longitudinal cross-sectional view of

[0016] Figure 3 Figure 1 Exploded diagram of

[0017] Figure 4 Schematic diagram of the structure of the sensor elastic body

[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 base plate;

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

[0022] Fig. 9 for Figure 8 A top view of

[0023] Fig.10 One of the traditional bridge sensor schematics;

[0024] Fig.11 Schematic diagram of traditional bridge sensor 2. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 11 As shown, a double-column bridge weighing sensor includes a sensor, an upper pressure head 2, a steel ball 4 and a bottom plate 3. The sensor includes an elastic body 1 and a strain gauge located on the elastic body 1. The elastic body 1 is an integral part consisting of an upper bearing end 11, a lower fixed end 12 and a double column 13 therebetween. The double column 13 is symmetrically arranged between the upper bearing end 11 and the lower fixed end 12. Each column in the double body 13 is provided with a central hole 131 for inserting a strain gauge. Four strain gauges are arranged in the central hole and are interconnected and located on a Wheatstone bridge. The two independent Wheatstone bridges of the double column 13 form a double bridge structure.

[0027] The specific structure is as follows: the double cylinder 13 is two rectangular columns symmetrically arranged with the center of the upper bearing end 11 as the central axis, the upper and lower ends of the double cylinder 13 are respectively fixedly connected to the bottom surface of the upper bearing end 11 and the top surface of the lower fixed end 13, and the front, back, left and right sides of the double cylinder 13 are flush with the upper bearing end 11 and the lower fixed end 12, and the left and right sides of the double cylinder 13 where the upper bearing end 11 and the lower fixed end 13 are connected are concavely provided with a through strip groove 10, and a through "I"-shaped slot hole 20 is formed between the two cylinders, thereby forming the upper bearing end 11, the double cylinder 13 and the lower fixed end 12, and the "I"-shaped slot hole 20 is adjusted by machining or wire cutting to correct the product accuracy. The steel ball 4 is located between the upper bearing end 11 and the upper pressure head 2, and the upper end surface of the upper bearing end 11 and the lower end surface of the upper pressure head 2 are respectively concavely provided with spherical surfaces 111 and 21 that abut against the steel ball 4 and facilitate the rolling of the steel ball 4. A shield 5 for limiting the position of the steel ball 4 is provided above the upper bearing end 11. The cross section of the shield 5 is square. A partial ball hole 51 is provided in the middle of the shield 5 to match the spherical surface 111 of the upper bearing end 11. The shield 5 positioning sleeve is arranged on the upper end of the upper bearing end 11. The partial ball hole 51 of the shield 5 is connected with the spherical surface 111 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.

[0028] The middle part of the lower end of the shield 5 is recessed with a positioning groove 52 that runs through the left and right sides for the upper end of the upper load-bearing end 11 to be placed in. The shield 5 is sleeved on the upper end of the upper load-bearing end 11 through the positioning groove 52. The bottom plate 3 of this embodiment is a square plate, and the four corners of the bottom plate 3 are provided with mounting holes 31 for fixing the weighing sensor. The four corners of the bottom surface of the lower fixed end 12 are provided with four fixing bolt holes. The bottom plate 3 is provided with corresponding connecting countersunk holes 32. The bottom plate 3 and the lower fixed end 12 are fixed by bolts, so that the sensor is fixed on the bottom plate 3, and the sensor is restricted from rotating and moving 360 degrees forward, backward, left, and right.

[0029] Waterproof connectors 6 are provided on the left and right sides of the lower fixed end 12 to connect the circuit part of the weighing sensor.

[0030] The specific structure inside the sensor is consistent with the prior art and will not be repeated here.

[0031] In this embodiment, the elastomer 1 is designed as a double-column bridge structure. The double-column structure can form a dual-path Wheatstone bridge to balance the lever arm signal. The signals between the two columns can be complementary, thereby realizing signal compensation for the off-center load effect 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 5 is set at the upper end of the upper bearing end 11 to limit the steel ball 5. The lower fixed end 12 is fixed to the base plate 3 by bolts to limit the sensor's 360-degree rotation and movement forward, backward, left, and right.

[0032] The sensor of the utility model can realize the advantages of the traditional column type sensor, which is simple in structure and easy to manufacture, and can overcome the inherent defect of low measurement accuracy of the column type sensor, and achieve relatively high accuracy in terms of anti-eccentric load, anti-impact, azimuth error, etc. It can also have the stable and reliable performance of the traditional bridge type sensor, excellent dynamic response performance, self-reset, strong adaptability, and achieve long-term stable high-precision weighing effect.

[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 double-column bridge type weighing sensor, comprising a sensor, an upper pressure head, a steel ball and a bottom plate, wherein the sensor comprises an elastic body and a strain gauge located on the elastic body, characterized in that: The elastic body is an integral part consisting of an upper bearing end, a double cylinder and a lower fixed end. The double cylinder is symmetrically arranged between the upper bearing end and the lower fixed end. Each single cylinder in the double body is provided with a central hole for inserting a strain gauge. Four strain gauges are arranged in the central hole and are interconnected on a Wheatstone bridge. The two independent Wheatstone bridges of the double cylinder form a double bridge circuit structure.

2. The double-column bridge type weighing sensor according to claim 1, characterized in that: The double columns are two rectangular columns symmetrically arranged on the left and right. The upper and lower ends of the double columns are fixedly connected to the bottom surface of the upper load-bearing end and the top surface of the lower fixed end respectively, and the front, back, left and right sides of the double columns are flush with the upper load-bearing end and the lower fixed end. The left and right sides where the double columns are connected with the upper load-bearing end and the lower fixed end are concave with penetrating strip grooves, and a penetrating "I"-shaped slot hole is formed between the two columns, thereby forming the upper load-bearing end, the double columns and the lower fixed end.

3. The double-column bridge type weighing sensor according to claim 2, characterized in that: The "I"-shaped slot hole is machined or wire cut to adjust the size structure of the slot to correct the product accuracy.

4. The double-column bridge type weighing sensor according to claim 2, 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 double-column bridge 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. The cross-section of the shield is square. A partial ball hole matching the spherical surface of the upper bearing end is provided through the middle of the shield. The shield positioning sleeve is provided at the upper end of the upper bearing end. The partial ball hole of the shield is connected to the spherical surface to form a ball socket structure for the lower part of the steel ball to be placed.

6. The double-column bridge type weighing sensor according to claim 5, characterized in that: A positioning groove is concavely provided in the middle of the lower end of the shield and penetrates from left to right for the upper end of the upper bearing end to be placed therein, and the shield is sleeved on the upper end of the upper bearing end through the positioning groove.

7. The double-column bridge type weighing sensor according to any one of claims 1 to 6, characterized in that: The base plate is a square plate, with fixed installation holes at the four corners of the base plate, fixing bolt holes at the four corners of the bottom surface of the lower fixed end, corresponding connecting countersunk holes on the base plate, the base plate and the lower fixed end are fixed by bolts, and waterproof joints are provided on the left and right sides of the lower fixed end.

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