A self-resetting column weighing sensor

Abstract

The present invention discloses a self-resetting column type weighing sensor, comprising a columnar elastic body, a pressure head, and a bearing base, wherein the lower end of the columnar elastic body is connected to the bearing base, the pressure head is arranged at the upper end of the columnar elastic body, a strain gauge is arranged on the columnar elastic body, a second groove is arranged on the bearing base, the lower end of the columnar elastic body is inserted into the second groove, and a reset mechanism for resetting the columnar elastic body is arranged between the columnar elastic body and the bearing base. In the present invention, a reset mechanism is arranged between the columnar elastic body and the bearing base, so that when the elastic body is tilted after being impacted by a lateral load, when the lateral load disappears, the columnar elastic body can automatically reset under the action of the reset mechanism, thereby avoiding the columnar elastic body from being unable to be used due to permanent tilt.

Description

Technical Field

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

[0002] At present, column weighing sensors are widely used in various electronic weighing equipment such as various truck scales, track scales, axle weight scales, and tank scales. The existing column weighing sensors include a bearing base, an elastic body, and an upper pressure head. The elastic body is columnar, and a strain gauge is arranged on the elastic body. The elastic body is fixed on the bearing base, and the pressure head is arranged on the upper end of the elastic body. The bearing base is installed on the weighing device. During weighing, the load is applied to the pressure head and transmitted to the elastic body through the pressure head. After the elastic body is subjected to the load, a certain deformation will occur. The strain gauge arranged on the elastic body can deform with the deformation of the elastic body. The strain gauge converts the deformation into an electrical signal and transmits it to the processing system. After the control system is calculated and processed, the actual weight data of the object can be obtained. At present, the elastic body is generally fixed on the bearing base by welding or bolt connection or point contact between the convex spherical surface and the plane. In actual use, the elastic body is often impacted by lateral loads. The lateral load easily causes the elastic body to tilt, and once tilted, it cannot be automatically reset, resulting in damage to the entire bearing sensor and making it unusable. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the elastic body of the existing column weighing sensor is easily tilted and cannot be automatically reset after being impacted by a lateral load during use, resulting in inaccurate weighing and damage to the sensor, making it unusable. A self-resetting column weighing sensor is provided to effectively solve the above problem.

[0004] The objective of the present invention is achieved through the following technical scheme: a self-resetting column type weighing sensor, comprising a columnar elastic body, a pressure head, and a bearing base, wherein the lower end of the columnar elastic body is connected to the bearing base, the pressure head is arranged at the upper end of the columnar elastic body, a strain gauge is arranged on the columnar elastic body, a second groove is arranged on the bearing base, the lower end of the columnar elastic body is inserted into the second groove, and a reset mechanism for resetting the columnar elastic body is arranged between the columnar elastic body and the bearing base.

[0005] When the present invention is in use, the sensor is electrically connected to the control system, and the load is applied to the pressure head and transmitted to the elastic body through the pressure head. After the elastic body is subjected to the load, a certain deformation will occur, and the strain gauge arranged on the elastic body can deform along with the deformation of the elastic body. The strain gauge converts the deformation into an electrical signal and transmits it to the processing system. After calculation and processing, the control system can obtain the actual weight data of the object. In the present invention, a reset mechanism is arranged between the columnar elastic body and the bearing base, so that when the elastic body is tilted after being impacted by a lateral load, when the lateral load disappears, the columnar elastic body can automatically reset under the action of the reset mechanism, thereby avoiding the columnar elastic body from being unable to be used due to permanent tilt.

[0006] Preferably, a first groove is provided on one side of the pressure head close to the columnar elastic body, the upper end of the columnar elastic body is inserted into the first groove, the upper end surface of the columnar elastic body is a first concave spherical surface that is concave downward, and the bottom surface of the first groove is a first convex spherical surface that is convex downward. The spherical radius of the first concave spherical surface is greater than the spherical radius of the first convex spherical surface, the first concave spherical surface and the first convex spherical surface are matched in the form of point contact, the pressure head has a certain rotation space relative to the columnar elastic body, and when the pressure head is subjected to a lateral load, the influence on the columnar elastic body can be reduced.

[0007] Preferably, four bonding planes are arranged in the circumferential direction of the columnar elastic body, and the strain gauge is bonded on the bonding planes. By machining the bonding planes on the columnar elastic body, the bonding of the strain gauge is facilitated.

[0008] Preferably, a housing is disposed outside the columnar elastic body, and the strain gauge is located inside the housing. The housing can provide good protection for the columnar elastic body and the strain gauge disposed on the columnar elastic body.

[0009] Preferably, a cable connector is provided on the housing, and the strain gauge is electrically connected to the cable connector.

[0010] Preferably, the reset mechanism includes a plurality of fixed grooves arranged on the side of the second groove, the fixed grooves are distributed on the side of the second groove in a circular array, an elastic sheet is arranged in the fixed groove, the cross section of the elastic sheet is a "U" shape placed horizontally, and a convex block corresponding to the elastic sheet is arranged at the bottom of the columnar elastic body, the convex block is located below the elastic sheet, the lower surface of the convex block contacts the bottom surface of the second groove, and one end of the elastic sheet abuts against the upper surface of the convex block. The elastic sheet can apply downward pressure to the convex block arranged at the lower end of the columnar elastic body, so that the convex block is close to the bottom surface of the second groove, so that the columnar elastic body remains in a vertical state. When impacted by a lateral load, the columnar elastic body will tilt to one side, at which time, the convex block at the bottom of the columnar elastic body will detach from the bottom surface of the second groove, and when the lateral load disappears, the elastic sheet will press the convex block back to the bottom surface of the second groove, so that the columnar elastic body still remains in a vertical state, thereby achieving the function of automatic reset. In the present invention, after the columnar elastic body is impacted by a lateral load, the columnar elastic body can be allowed to move within the elastic range of the elastic sheet to a certain extent, thereby providing a certain buffering effect on the columnar elastic body and effectively reducing the risk of fracture of the columnar elastic body.

[0011] Preferably, the elastic sheet is made of spring steel.

[0012] Preferably, the middle of the bottom surface of the second groove is a second concave spherical surface that is sunken downward, the area on the bottom surface of the second groove other than the second concave spherical surface is a plane, the lower end surface of the columnar elastic body is a second convex spherical surface that is convex downward, the second convex spherical surface fits with the second concave spherical surface, and the lower surface of the protrusion contacts the positioning plane. Through the cooperation between the second convex spherical surface and the second concave spherical surface, the lower end of the columnar elastic body is always located in the middle position of the second groove, which plays a positioning role for the columnar elastic body.

[0013] The beneficial effect of the present invention is that a reset mechanism is arranged between the columnar elastic body and the bearing base, so that when the elastic body is tilted after being impacted by a lateral load, when the lateral load disappears, the columnar elastic body can automatically reset under the action of the reset mechanism, thereby avoiding the columnar elastic body from being unable to be used due to permanent tilt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention.

[0015] Figure 2 It is a cross-sectional view along the AA direction of the present invention.

[0016] Figure 3 for Figure 1 Enlarged view of part a in the middle.

[0017] Figure 4 for Figure 1 Enlarged view of part b in the middle.

[0018] In the figure: 1, columnar elastic body, 2, shell, 3, pressure head, 4, bearing base, 5, strain gauge, 6, cable connector, 7, first groove, 8, second groove, 9, fixing groove, 10, elastic sheet, 11, bump. DETAILED DESCRIPTION

[0019] The present invention will be further described below through specific implementation modes in conjunction with the accompanying drawings.

[0020] Embodiment 1:

[0021] like Figures 1 to 4 As shown, a self-resetting column type weighing sensor comprises a columnar elastic body 1, a pressure head 3 and a bearing base 4. The columnar elastic body 1 is a cylindrical structure. The lower end of the columnar elastic body 1 is connected to the bearing base 4. The pressure head 3 is arranged at the upper end of the columnar elastic body 1. A first groove 7 is arranged on the side of the pressure head 3 close to the columnar elastic body 1, and the upper end of the columnar elastic body 1 is inserted into the first groove 7. The upper end surface of the columnar elastic body 1 is a first concave spherical surface that is concave downward, and the bottom surface of the first groove 7 is a first convex spherical surface that is convex downward. The spherical radius of the first concave spherical surface is greater than the spherical radius of the first convex spherical surface, and the first concave spherical surface and the first convex spherical surface are matched in the form of point contact. A strain gauge 5 is arranged on the columnar elastic body 1. Four bonding planes are arranged in the circumferential direction of the columnar elastic body 5. The bonding plane is located in the middle position of the columnar elastic body 1. The strain gauge 5 is bonded to the bonding plane. The strain gauge 5 is a prior art, and its specific structure and principle can be referred to the utility model patent with application number CN201120286920.6, and the name of the utility model patent is strain gauge. A housing 2 is provided outside the columnar elastic body 1, and the strain gauge is located inside the housing 2. A cable connector 6 is provided on the housing 2. The strain gauge 5 is electrically connected to the cable connector 6.

[0022] A second groove 8 is provided on the bearing base 4, and the lower end of the columnar elastic body 1 is inserted into the second groove 8. A reset mechanism for resetting the columnar elastic body 1 is provided between the columnar elastic body 1 and the bearing base 4. The reset mechanism includes a plurality of fixing grooves 9 provided on the side of the second groove 8. The fixing grooves 9 are distributed on the side of the second groove 8 in a circular array. An elastic sheet 10 is provided in the fixing groove 9. The elastic sheet 10 is made of spring steel. The cross section of the elastic sheet 10 is a "U" shape placed horizontally. A convex block 11 corresponding to the elastic sheet is provided at the bottom of the columnar elastic body 1. The convex block 11 is located below the elastic sheet 10. The lower surface of the convex block 11 contacts the bottom surface of the second groove 8. One end of the elastic sheet 10 abuts against the upper surface of the convex block 11. The middle of the bottom surface of the second groove 8 is a second concave spherical surface that is concave downward. The lower end surface of the columnar elastic body 1 is a second convex spherical surface that is convex downward, and the second convex spherical surface is in contact with the second concave spherical surface. The areas outside the second concave spherical surface on the bottom surface of the second groove are all positioning planes, and the lower surface of the protrusion 11 is in contact with the positioning plane. The elastic sheet can apply downward pressure to the protrusion arranged at the lower end of the columnar elastomer, so that the protrusion is close to the bottom surface of the second groove, so that the columnar elastomer remains in a vertical state. When impacted by a lateral load, the columnar elastomer will tilt to one side. At this time, the protrusion at the bottom of the columnar elastomer will detach from the bottom surface of the second groove. When the lateral load disappears, the elastic sheet will press the protrusion back to the bottom surface of the second groove, so that the columnar elastomer still remains in a vertical state, thereby achieving an automatic reset function. In the present invention, after the columnar elastomer is impacted by a lateral load, it can allow the columnar elastomer to move to a certain extent within the elastic range of the elastic sheet, thereby playing a certain buffering role on the columnar elastomer, effectively reducing the risk of fracture of the columnar elastic.

[0023] When the present invention is in use, the sensor is electrically connected to the control system, and the load is applied to the pressure head and transmitted to the elastic body through the pressure head. After the elastic body is subjected to the load, a certain deformation will occur, and the strain gauge arranged on the elastic body can deform along with the deformation of the elastic body. The strain gauge converts the deformation into an electrical signal and transmits it to the processing system. After calculation and processing, the control system can obtain the actual weight data of the object. In the present invention, a reset mechanism is arranged between the columnar elastic body and the bearing base, so that when the elastic body is tilted after being impacted by a lateral load, when the lateral load disappears, the columnar elastic body can automatically reset under the action of the reset mechanism, thereby avoiding the columnar elastic body from being unable to be used due to permanent tilt.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-resetting column type weighing sensor, comprising a columnar elastic body, a pressure head, and a bearing base, wherein the lower end of the columnar elastic body is connected to the bearing base, the pressure head is arranged at the upper end of the columnar elastic body, and a strain gauge is arranged on the columnar elastic body, characterized in that: A first groove is provided on one side of the pressure head close to the columnar elastic body, and the upper end of the columnar elastic body is inserted into the first groove. A second groove is provided on the bearing base, and the lower end of the columnar elastic body is inserted into the second groove. A reset mechanism for resetting the columnar elastic body is provided between the columnar elastic body and the bearing base, and the reset mechanism includes a plurality of fixing grooves provided on the side of the second groove, and an elastic sheet is provided in the fixing groove, and the cross-section of the elastic sheet is a "U" shape placed laterally. A convex block corresponding to the elastic sheet is provided at the bottom of the columnar elastic body, and the convex block is located below the elastic sheet, and the lower surface of the convex block contacts the bottom surface of the second groove, and one end of the elastic sheet abuts against the upper surface of the convex block. The middle of the bottom surface of the second groove is a second concave spherical surface that is concave downward, and the areas on the bottom surface of the second groove other than the second concave spherical surface are all positioning planes. The lower end surface of the columnar elastic body is a second convex spherical surface that protrudes downward, and the second convex spherical surface fits the second concave spherical surface, and the lower surface of the convex block contacts the positioning plane.

2. A self-resetting column type weighing sensor according to claim 1, characterized in that: The upper end surface of the columnar elastic body is a first concave spherical surface that is recessed downward, and the bottom surface of the first groove is a first convex spherical surface that is protruding downward.

3. A self-resetting column type weighing sensor according to claim 1, characterized in that: Four bonding planes are arranged in the circumferential direction of the columnar elastic body, and the strain gauges are bonded on the bonding planes.

4. A self-resetting column type weighing sensor according to claim 1, characterized in that: A shell is arranged outside the columnar elastic body, and the strain gauge is located inside the shell.

5. A self-resetting column type weighing sensor according to claim 4, characterized in that: The shell is provided with a cable connector, and the strain gauge is electrically connected to the cable connector.

6. A self-resetting column type weighing sensor according to claim 1, characterized in that: The fixing grooves are distributed on the side surface of the second groove in a circular array.

7. A self-resetting column type weighing sensor according to claim 1, characterized in that: The elastic sheet is made of spring steel.

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