Shearing beam weighing sensor

Abstract

The utility model relates to the technical field of sensors, and discloses a shear beam weighing sensor, which comprises a sensor shell, a pressure head and an elastic body, a hemispherical groove, a first annular limiting groove and a second annular limiting groove are sequentially arranged in the pressure head from top to bottom, a bearing ball column is arranged between the elastic body and the pressure head, and the bearing ball column comprises a hemispherical joint. And the semispherical joint is movably embedded in the semispherical groove. The bearing ball column can be limited below the pressure head through the cooperative use of the annular limiting groove and the limiting column, so that the bearing ball column cannot fall off from the pressure head, the spherical joint of the bearing ball column is movably embedded into the spherical groove, the spherical joint can freely rotate in the spherical groove, and when the bearing ball column is subjected to a transverse acting force, the bearing ball column is prevented from falling off from the pressure head. The spherical joint evenly transmits pressure to the elastic body through self rotation, meanwhile abrasion of the spherical joint can be reduced, and the limiting plate arranged above the elastic body can limit the spherical joint in the elastic body to prevent the spherical joint from falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a shear beam weighing sensor. Background Technique

[0002] A weighing sensor is a device that converts a mass signal into a measurable electrical signal and is widely used in various electronic weighing devices such as electronic truck scales, vehicle inspection lines, rail scales, livestock scales, modules, and platform scales. Among them, the shear beam weighing sensor is applied to large electronic weighing devices due to its simple and compact structure, large stiffness, high natural frequency, and fast dynamic response. The shear beam weighing sensor generally includes a pressure head, a carrier, and an elastic body, and the pressure head and the elastic body are connected through the carrier.

[0003] The prior art publication number CN111174877A discloses a double shear beam weighing sensor, including a bottom plate and an elastic body arranged on the bottom plate. A bearing steel ball is arranged above the elastic body, and a pressure head is arranged above the bearing steel ball. A strain groove is transversely arranged on the elastic body, and patch holes are symmetrically arranged on both sides below the strain groove. Strain gauges are pasted in the patch holes, and an isolation groove is transversely arranged below the patch holes, and one end of the isolation groove extends to the end face of the elastic body.

[0004] In the above device, both the patch holes and the strain gauges are arranged below the strain groove and are far from the bearing steel ball, effectively improving the measurement accuracy. However, using a steel ball for bearing, this structure is not stable enough. When the heavy object above the pressure head is placed irregularly, the pressure head is extremely easy to tilt to one side. At the same time, when the pressure head is subjected to a lateral force, the pressure head will rotate irregularly around the steel ball, and the heavy object on the pressure head is easy to fall off. At the same time, the above device lacks a limiting structure for the carrier (that is, the steel ball), and it is easy to occur the phenomenon of detachment between the carrier and the pressure head, making it unsafe to use. Therefore, a shear beam weighing sensor is proposed that can limit the carrier, prevent the carrier from falling off, measure more accurately, and be safer to use. Content of the Utility Model

[0005] The purpose of the utility model is to provide a shear beam weighing sensor to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A shear beam load cell, comprising a sensor housing, a pressure head and an elastomer. A hemispherical groove, a first annular limiting groove and a second annular limiting groove are successively formed in the pressure head from top to bottom. A bearing ball column is arranged between the elastomer and the pressure head. The bearing ball column comprises a hemispherical joint which is movably embedded in the hemispherical groove. A first limiting column is fixed at the bottom of the hemispherical joint, and a second limiting column is fixed at the bottom end of the first limiting column. The first limiting column is rotatably connected in the first annular limiting groove, and the second limiting column is rotatably connected in the second annular limiting groove. A connecting column is fixed at the bottom end of the second limiting column, and a spherical joint is fixed at the bottom end of the connecting column. A spherical groove is formed in one side of the top of the elastomer corresponding to the bearing ball column, and the spherical joint is movably embedded in the spherical groove.

[0008] As a further solution of the present utility model: a strain groove is transversely arranged on the elastomer, and the strain groove penetrates through the front and rear end faces of the elastomer. The strain groove comprises an arc section and straight sections located on both sides of the arc section, and the arc section protrudes downward. Mounting holes are formed on both sides of the elastomer near the lower part of the strain groove, and strain gauges are mounted in both of the mounting holes. A cable connector is arranged on one side of the sensor housing, and both of the strain gauges are electrically connected to the cable connector through leads. Isolation grooves are transversely arranged on both sides of the elastomer near the lower part of both of the strain gauges, the two isolation grooves are symmetrically arranged, and both of the isolation grooves penetrate through the front and rear end faces of the elastomer.

[0009] As a further solution of the present utility model: a cylindrical hole is formed on one side of the top of the sensor housing corresponding to the bearing ball column, the connecting column is arranged in the cylindrical hole, and the outer diameter of the connecting column is smaller than the inner diameter of the cylindrical hole. A limiting plate is arranged above the elastomer. A limiting hole is formed on one side of the limiting plate corresponding to the spherical groove, the inner diameter of the limiting hole is smaller than the outer diameter of the spherical joint, and the inner diameter of the limiting hole is larger than the outer diameter of the connecting column. The limiting plate is fixed above the elastomer by screws.

[0010] As a further solution of the present utility model: the pressure head is arranged on one side of the top of the sensor housing, a gap is left between the pressure head and the sensor housing, a base is fixed on one side of the inner part of the sensor housing corresponding to the pressure head by screws, and the elastomer is arranged above the base.

[0011] As a further solution of the present utility model: the spherical groove matches with the spherical joint, and the inner diameter of the spherical groove is larger than the outer diameter of the spherical joint.

[0012] As a further solution of the utility model: a mounting groove is opened on the top of the base, the elastomer is placed in the mounting groove, and the elastomer and the base are fixedly connected by a plurality of screws, and the base is fixed to the inside of the sensor housing by screws.

[0013] As a further solution of the utility model: the inner diameter of the hemispherical groove is smaller than the inner diameter of the first annular limiting groove, and the inner diameter of the first annular limiting groove is smaller than the inner diameter of the second annular limiting groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In the utility model, the hemispherical joint of the bearing ball column is movably embedded in the hemispherical groove inside the pressure head, and the hemispherical joint and the hemispherical groove rotate freely. When a heavy object is placed on the pressure head, the hemispherical joint can tightly press against the pressure head. Even when a part of the lateral force is transmitted to the pressure head, the hemispherical joint can also press against the pressure head. At the same time, the first limit column is rotatably connected to the first annular limit groove, and the second limit column is rotatably connected to the second annular limit groove, which can disperse the lateral force on the hemispherical joint and offset this part of the pressure through the rotation of the limit column itself, so that the pressure head will not deflect too much downward or upward, and the heavy object placed on the pressure head will not fall down easily;

[0016] 2. In the utility model, the bearing ball column can be limited below the pressure head by the coordinated use of the annular limiting groove and the limiting column, so that the bearing ball column cannot fall from the pressure head. Furthermore, the ball joint at the bottom end of the bearing ball column is movably embedded in the ball groove, and the ball joint can rotate freely in the ball groove. When the bearing ball column is subjected to a lateral force, the ball joint transfers the pressure to the elastic body evenly through its own rotation, which can make the force more even and reduce the wear of the ball joint. The limiting plate arranged above the elastic body can also limit the ball joint in the elastic body to prevent it from falling off, which is safer to use.

[0017] 3. In the utility model, the load is transferred to the elastic body through the load-bearing ball column. After the elastic body is subjected to pressure, the load is transferred to the elastic body part between the strain groove and the isolation groove through the supports on both sides of the strain groove, so that this part of the elastic body undergoes elastic deformation. The strain gauge in the mounting hole can detect the amount of deformation of this part of the elastic body and convert it into an electrical signal to transmit it outward. The mounting hole and the strain gauge are both arranged below the strain groove, and are far away from the spherical groove and the spherical joint. In this way, even when the load-bearing ball column is deflected by the lateral force, the deformation amount of the elastic body part between the strain groove and the isolation groove will not be greatly affected. By detecting the deformation amount of this part of the elastic body through the strain gauge, the measurement result will be more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0019] Figure 1 It is a schematic structural diagram of the present utility model.

[0020] Figure 2 It is an exploded view of the present utility model.

[0021] Figure 3 It is a schematic bottom view structural diagram of the pressure head in the present utility model.

[0022] Figure 4 It is a schematic structural diagram of the load-bearing ball column in the present utility model.

[0023] Figure 5 It is a schematic structural diagram of the elastic body in the present utility model.

[0024] Annotation of reference numerals: 1 - sensor housing, 2 - cable connector, 3 - pressure head, 31 - hemispherical groove, 32 - first annular limiting groove, 33 - second annular limiting groove, 4 - load-bearing ball column, 41 - hemispherical joint, 42 - first limiting post, 43 - second limiting post, 44 - connecting post, 45 - spherical joint, 5 - limiting plate, 51 - limiting hole, 6 - elastic body, 61 - strain groove, 62 - mounting hole, 63 - strain gauge, 64 - isolation groove, 65 - spherical groove, 7 - base, 71 - mounting groove, 8 - cylindrical hole. Detailed implementation manners

[0025] The following embodiments will describe the present utility model in detail in conjunction with the attached drawings. In the attached drawings or descriptions, similar or identical parts use the same reference numerals, and in actual applications, the shapes, thicknesses or heights of each component can be enlarged or reduced. The various embodiments listed in the present utility model are only used to illustrate the present utility model and are not used to limit the scope of the present utility model. Any obvious modification or change made to the present utility model does not depart from the spirit and scope of the present utility model.

[0026] Embodiment 1

[0027] Please refer to Figure 1 , in the embodiment of the present utility model, a shear beam load cell includes a sensor housing 1. One side of the sensor housing 1 is provided with a cable connector 2, and one side of the top of the sensor housing 1 is provided with a pressure head 3, and there is a gap between the pressure head 3 and the sensor housing 1.

[0028] Please refer to Figure 2, on one side of the sensor housing 1 corresponding to the indenter 3, a base 7 is fixed by screws. Above the base 7, an elastic body 6 is provided. Above the elastic body 6, a limiting plate 5 is provided. Between the elastic body 6 and the indenter 3, a load-bearing ball column 4 is provided. On one side of the top of the sensor housing 1 corresponding to the load-bearing ball column 4, a cylindrical hole 8 is opened.

[0029] Please refer to Figure 3 , inside the indenter 3, a hemispherical groove 31, a first annular limiting groove 32, and a second annular limiting groove 33 are successively opened from top to bottom. The inner diameter of the hemispherical groove 31 is smaller than the inner diameter of the first annular limiting groove 32, and the inner diameter of the first annular limiting groove 32 is smaller than the inner diameter of the second annular limiting groove 33.

[0030] Please refer to Figure 4 , the load-bearing ball column 4 includes a hemispherical joint 41. The hemispherical joint 41 is movably embedded in the hemispherical groove 31. At the bottom of the hemispherical joint 41, a first limiting column 42 is fixed. At the bottom end of the first limiting column 42, a second limiting column 43 is fixed. The first limiting column 42 is rotatably connected in the first annular limiting groove 32. The second limiting column 43 is rotatably connected in the second annular limiting groove 33. At the bottom end of the second limiting column 43, a connecting column 44 is fixed. At the bottom end of the connecting column 44, a spherical joint 45 is fixed. The connecting column 44 is arranged in the cylindrical hole 8, and the outer diameter of the connecting column 44 is smaller than the inner diameter of the cylindrical hole 8.

[0031] Embodiment 2

[0032] Please refer to Figure 5 , on the basis of Embodiment 1, on one side of the top of the elastic body 6 corresponding to the load-bearing ball column 4, a spherical groove 65 is opened. The spherical groove 65 is matched with the spherical joint 45, and the inner diameter of the spherical groove 65 is larger than the outer diameter of the spherical joint 45. The spherical joint 45 is movably embedded in the spherical groove 65; on one side of the limiting plate 5 corresponding to the spherical groove 65, a limiting hole 51 is opened. The inner diameter of the limiting hole 51 is smaller than the outer diameter of the spherical joint 45, and the inner diameter of the limiting hole 51 is larger than the outer diameter of the connecting column 44. The limiting plate 5 is fixed above the elastic body 6 by screws; the spherical joint 45 is embedded into the spherical groove 65, and then the limiting plate 5 is sleeved outside the connecting column 44, so that the spherical joint 45 can be limited in the spherical groove 65 to prevent the load-bearing ball column 4 from falling off the device;

[0033] A strain groove 61 is transversely arranged on the elastomer 6. The strain groove 61 penetrates through the front and rear end faces of the elastomer 6. The strain groove 61 includes an arc segment and straight segments located on both sides of the arc segment. The arc segment protrudes downward. Mounting holes 62 are formed on both sides of the elastomer 6 near the lower part of the strain groove 61. Strain gauges 63 are installed in both mounting holes 62. Both strain gauges 63 are electrically connected to the cable connector 2 through leads. Isolation grooves 64 are transversely arranged below both strain gauges 63 on the elastomer 6. The two isolation grooves 64 are symmetrically arranged and both penetrate through the front and rear end faces of the elastomer 6. An installation groove 71 is formed at the top of the base 7. The elastomer 6 is placed in the installation groove 71, and the elastomer 6 and the base 7 are fixedly connected by a plurality of screws. The base 7 is fixed inside the sensor housing 1 by screws.

[0034] Working principle: The hemispherical joint 41 of the load-bearing ball column 4 is movably embedded in the hemispherical groove 31 inside the indenter 3. The hemispherical joint 41 can freely rotate in the hemispherical groove 31. When a heavy object is placed on the indenter 3, the hemispherical joint 41 can tightly abut against the indenter 3. Even when a part of the lateral force is transmitted to the indenter 3, the hemispherical joint 41 can still abut against the indenter. At the same time, the first limiting column 42 is rotatably connected in the first annular limiting groove 32, and the second limiting column 43 is rotatably connected in the second annular limiting groove 33. The lateral force received at the hemispherical joint 41 can be dispersed and this part of the pressure can be offset by the rotation of the limiting column itself, so that the indenter will not deflect too much downward or upward, and the heavy object placed on the indenter is not likely to fall off. Further, by using the cooperation of the annular limiting groove and the limiting column, the load-bearing ball column 4 can be limited below the indenter 3, so that the load-bearing ball column 4 cannot fall out of the indenter 3, and the use is safer. The spherical joint 45 at the bottom end of the load-bearing ball column 4 is movably embedded in the spherical groove 65. The spherical joint 45 can freely rotate in the spherical groove 65. When the load-bearing ball column 4 receives a lateral force, the spherical joint 45 evenly transmits the pressure to the elastomer 6 through its own rotation. While the force is more evenly distributed, the wear of the spherical joint 45 can also be reduced. The limiting plate 5 arranged above the elastomer 6 can also limit the spherical joint 45 in the elastomer 6 to prevent it from falling off;

[0035] During the weighing process, the load is transmitted to the elastomer 6 through the load-bearing ball column 4. After the elastomer 6 is subjected to pressure, it is transmitted through the supports on both sides of the strain groove 61 to the elastomer part between the strain groove 61 and the isolation groove 64, causing elastic deformation of this part of the elastomer. The strain gauge 63 in the mounting hole 62 can detect the amount of deformation of this part of the elastomer and convert it into an electrical signal and transmit it outward. Both the mounting hole 62 and the strain gauge 63 are arranged below the strain groove 61 and are at a relatively far distance from the spherical groove 65 and the spherical joint 45. In this way, even when the load-bearing ball column 4 deflects under a lateral force, the amount of deformation of the elastomer part between the strain groove 61 and the isolation groove 64 will not be affected too much, and by detecting the amount of deformation of this part of the elastomer through the strain gauge 63, the measurement result will be more accurate.

[0036] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights.

[0037] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shear beam weighing sensor, comprising a sensor housing (1), a pressure head (3) and an elastic body (6), characterized in that: The inside of the pressure head (3) is provided with a hemispherical groove (31), a first annular limiting groove (32) and a second annular limiting groove (33) in sequence from top to bottom; a bearing ball column (4) is provided between the elastic body (6) and the pressure head (3); the bearing ball column (4) comprises a hemispherical joint (41); the hemispherical joint (41) is movably embedded in the hemispherical groove (31); a first limiting column (42) is fixed to the bottom of the hemispherical joint (41); a second limiting column (42) is fixed to the bottom end of the first limiting column (42) (43), the first limiting column (42) is rotatably connected in the first annular limiting groove (32), the second limiting column (43) is rotatably connected in the second annular limiting groove (33), the bottom end of the second limiting column (43) is fixed with a connecting column (44), and the bottom end of the connecting column (44) is fixed with a spherical joint (45); a spherical groove (65) is provided on one side of the top of the elastomer (6) corresponding to the bearing ball column (4), and the spherical joint (45) is movably embedded in the spherical groove (65).

2. The shear beam load cell according to claim 1, characterized in that: A strain groove (61) is transversely arranged on the elastic body (6), and the strain groove (61) passes through the front and rear end surfaces of the elastic body (6). The strain groove (61) includes an arc segment and straight line segments located on both sides of the arc segment, and the arc segment protrudes downward. The elastic body (6) is provided with mounting holes (62) on both sides below the strain groove (61), and strain gauges (63) are installed in the two mounting holes (62). A cable connector (2) is arranged on one side of the sensor housing (1), and the two strain gauges (63) are electrically connected to the cable connector (2) through leads. The elastic body (6) is provided with an isolation groove (64) transversely arranged below the two strain gauges (63), and the two isolation grooves (64) are symmetrically arranged, and the two isolation grooves (64) pass through the front and rear end surfaces of the elastic body (6).

3. The shear beam load cell according to claim 2, characterized in that: A cylindrical hole (8) is provided on the top of the sensor housing (1) on a side corresponding to the bearing ball column (4), the connecting column (44) is arranged in the cylindrical hole (8), and the outer diameter of the connecting column (44) is smaller than the inner diameter of the cylindrical hole (8), a limiting plate (5) is provided above the elastomer (6), a limiting hole (51) is provided on a side of the limiting plate (5) corresponding to the spherical groove (65), the inner diameter of the limiting hole (51) is smaller than the outer diameter of the spherical joint (45), and the inner diameter of the limiting hole (51) is larger than the outer diameter of the connecting column (44), and the limiting plate (5) is fixed above the elastomer (6) by screws.

4. The shear beam load cell according to claim 3, characterized in that: The pressure head (3) is arranged on one side of the top of the sensor housing (1), with a gap between the pressure head (3) and the sensor housing (1), and a base (7) is fixed by screws on the side of the sensor housing (1) corresponding to the pressure head (3), and the elastic body (6) is arranged above the base (7).

5. The shear beam load cell according to claim 1 or 4, characterized in that: The spherical groove (65) matches the spherical joint (45), and the inner diameter of the spherical groove (65) is greater than the outer diameter of the spherical joint (45).

6. The shear beam load cell according to claim 4, characterized in that: The top of the base (7) is provided with a mounting groove (71), the elastomer (6) is placed in the mounting groove (71), and the elastomer (6) and the base (7) are fixedly connected by a plurality of screws, and the base (7) is fixed inside the sensor housing (1) by screws.

7. The shear beam load cell according to claim 1, characterized in that: The inner diameter of the hemispherical groove (31) is smaller than the inner diameter of the first annular limiting groove (32), and the inner diameter of the first annular limiting groove (32) is smaller than the inner diameter of the second annular limiting groove (33).

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