Gravity detection device

Abstract

The present application relates to a gravity detection device, belonging to the technical field of force detection devices. The gravity detection device includes a carrier, a base and a force measurement module. The base is located below the carrier; the force measurement module is arranged between the carrier and the base and is used to fix the carrier to the base, and is configured to allow the carrier to deform to release internal stress when the carrier undergoes thermal expansion and contraction. This gravity detection device can reduce the influence of thermal expansion and contraction of the carrier on the weighing accuracy and ensure the detection accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of force detection devices, and in particular to a gravity detection device. Background Art

[0002] During weighing, the scale needs to apply the load directly to the load cell through the scale body (carrying body). To ensure that gravity passes through the sensor axis and guarantee measurement accuracy, the scale is required to have a self-reset function. Therefore, the scale body structure of the scale is usually unconstrained. This allows the scale body to move freely, with a certain amount of movement during operation. This structure cannot be applied to scenarios such as dynamic vehicle scale inspections where vehicles pass the scale at high speeds, or scenarios where the road is free flow (no lane restrictions), and is bound to pose a hidden danger to driving safety.

[0003] To meet the requirements of high speed and free-flow detection, the scale structure must be fixed to the foundation (mounting base) and have sufficient rigidity and strength. However, this structure can deform due to thermal expansion and contraction of the rigid body during temperature fluctuations. This deformation force is then transmitted to the sensor, significantly affecting the weighing accuracy. Summary of the Invention

[0004] The purpose of the present application is to provide a gravity detection device that can reduce the influence of thermal expansion and contraction of a carrier on the measurement accuracy and ensure detection accuracy.

[0005] This application is achieved through the following technical solutions:

[0006] In one aspect, an embodiment of the present application provides a gravity detection device, comprising:

[0007] A carrier, used for carrying an object to be detected;

[0008] a foundation, located below the carrier;

[0009] The force measuring module is arranged between the carrier and the foundation and is used to fix the carrier to the foundation. The force measuring module is configured to allow the carrier to deform to release internal stress when the carrier expands or contracts due to heat.

[0010] According to the gravity detection device of the embodiment of the present application, the carrier and the foundation are fixed through a force measuring module to prevent the carrier from shaking relative to the foundation. When the carrier expands and contracts due to heat, the carrier can be allowed to deform to release internal stress, thereby reducing the influence of the thermal expansion and contraction of the carrier on the measurement accuracy and ensuring the accuracy of gravity detection.

[0011] In some embodiments of the present application, the force measuring module can limit the vertical force generated by the internal stress of the carrier in the vertical direction, and allow the carrier to have a predetermined translational freedom in the first horizontal direction and the second horizontal direction on the same horizontal plane with a fixed point as the fulcrum; wherein, the vertical direction is parallel to the center line of the carrier; the horizontal direction is perpendicular to the center line of the carrier.

[0012] In the above solution, through the force measuring module, the vertical force generated by the internal stress of the carrier is limited, and the internal stress of the carrier is allowed to be released in the horizontal direction, so as to eliminate the influence of external horizontal force on the sensor and reduce the influence on the weighing accuracy.

[0013] In some embodiments of the present application, the force measuring module includes four force measuring units, and the four force measuring units are circumferentially arrayed around the center line of the carrier; the four force measuring units are respectively a first force measuring unit, a second force measuring unit, a third force measuring unit and a fourth force measuring unit. The first force measuring unit and the fourth force measuring unit are arranged diagonally, the second force measuring unit and the third force measuring unit are arranged diagonally, the second force measuring unit and the first force measuring unit are spaced along the first horizontal direction, and the third force measuring unit and the first force measuring unit are spaced along the second horizontal direction perpendicular to the first horizontal direction;

[0014] The first force measuring unit is configured to limit the translational freedom of the carrier along the first horizontal direction and the second horizontal direction;

[0015] The second force measuring unit is configured to allow the translational freedom of the carrier along the first horizontal direction and limit the translational freedom of the carrier along the second horizontal direction;

[0016] The third force measuring unit is configured to allow the translational freedom of the carrier along the second horizontal direction and limit the translational freedom of the carrier along the first horizontal direction;

[0017] The fourth force measuring unit is configured to allow the translational freedom of the carrier along the first horizontal direction and the second horizontal direction.

[0018] In the above solution, the limit of the carrier in the horizontal plane is realized through four force measuring units to ensure the fixed position of the carrier relative to the foundation; the deformation of the carrier during thermal expansion and contraction and the release of stress in the horizontal plane are realized through the second force measuring unit, the third force measuring unit and the fourth detection unit, reducing the influence of thermal expansion and contraction on the weighing accuracy and ensuring the detection accuracy.

[0019] In some embodiments of the present application, each force measuring unit includes a gravity sensor and a spherical pair. The gravity sensor is fixedly connected to the foundation, and the carrier and the gravity sensor are connected through the spherical pair.

[0020] In the above solution, each force measuring unit has a spherical pair. The connection between the carrier and the gravity sensor is realized through the spherical pair, ensuring that the load force borne by the carrier is vertically downward, and ensuring the detection accuracy.

[0021] In some embodiments of the present application, the central axis of the gravity sensor is arranged in the vertical direction and passes through the center of the spherical pair.

[0022] In the above solution, since the central axis of the gravity sensor extends in the vertical direction and passes through the center of the spherical pair, it can ensure that the load force borne by the carrier is vertically downward transmitted through the center of the gravity sensor, thereby improving the detection accuracy and preventing the component force caused by non - coaxiality from acting on the gravity sensor and affecting the detection accuracy.

[0023] In some embodiments of the present application, the first force measuring unit includes: a first upper connecting block fixedly connected to the carrier; a first gravity sensor fixedly connected to the base; a first lower connecting block disposed between the first upper connecting block and the first gravity sensor, the first lower connecting block being fixedly connected to the first gravity sensor and forming a spherical pair with the first upper connecting block.

[0024] In the above solution, the connection between the first force measuring unit and the carrier is realized by fixedly connecting the first upper connecting block to the carrier; the connection between the first force measuring unit and the base is realized by fixedly connecting the first gravity sensor to the base; by forming a spherical pair between the first lower connecting block and the first upper connecting block, it can ensure that the load force of the carrier is vertically downward transmitted to the first gravity sensor through the center of the spherical pair to ensure the detection accuracy.

[0025] In some embodiments of the present application, the second force measuring unit includes: a second upper connecting block fixedly connected to the carrier; a second gravity sensor fixedly connected to the base; a second lower connecting block disposed between the second upper connecting block and the second gravity sensor, the second lower connecting block being fixedly connected to the second gravity sensor; a second middle connecting block located below the second upper connecting block, the upper end of the second middle connecting block forming a linear moving pair along the first horizontal direction with the second upper connecting block, and the lower end of the second middle connecting block forming a spherical pair with the second lower connecting block.

[0026] In the above solution, the second upper connecting block is fixedly connected to the carrier to realize the connection between the second force measuring unit and the carrier; the second gravity sensor is fixedly connected to the base to realize the connection between the second force measuring unit and the base; the upper end of the second middle connecting block forms a linear moving pair with the second upper connecting block along the first horizontal direction, reserving a release space for the horizontal force acting on the second upper connecting block, so as to release the deformation and stress of the carrier in the first horizontal direction, and the influence of external horizontal force on the second upper connecting block can be eliminated; the lower end of the second middle connecting block forms a spherical pair with the second lower connecting block, which can ensure that the load force of the carrier is vertically transmitted downward through the center of the spherical pair to the second gravity sensor to ensure the detection accuracy.

[0027] In some embodiments of the present application, the third force measuring unit includes: a third upper connecting block fixedly connected to the carrier; a third gravity sensor fixedly connected to the base; a third lower connecting block disposed between the third upper connecting block and the third gravity sensor, and the third lower connecting block is fixedly connected to the third gravity sensor; a third middle connecting block located below the third upper connecting block, the upper end of the third middle connecting block forms a linear moving pair with the third upper connecting block along the second horizontal direction, and the lower end of the third middle connecting block forms a spherical pair with the third lower connecting block.

[0028] In the above solution, the third upper connecting block is fixedly connected to the carrier to realize the connection between the third force measuring unit and the carrier; the third gravity sensor is fixedly connected to the base to realize the connection between the third force measuring unit and the base; the upper end of the third middle connecting block forms a linear moving pair with the third upper connecting block along the second horizontal direction, reserving a release space for the horizontal force acting on the third upper connecting block, so as to release the deformation and stress of the carrier in the second horizontal direction, and the influence of external horizontal force on the third upper connecting block can be eliminated; the lower end of the third middle connecting block forms a spherical pair with the third lower connecting block, which can ensure that the load force of the carrier is vertically transmitted downward through the center of the spherical pair to the third gravity sensor to ensure the detection accuracy.

[0029] In some embodiments of the present application, the fourth force measuring unit includes: a fourth upper connecting block fixedly connected to the carrier; a fourth gravity sensor fixedly connected to the base; a fourth lower connecting block disposed between the fourth upper connecting block and the fourth gravity sensor, and the fourth lower connecting block is fixedly connected to the fourth gravity sensor; a fourth middle connecting block located below the fourth upper connecting block, the upper end of the fourth middle connecting block forms a planar pair with the fourth upper connecting block, and the lower end of the fourth middle connecting block forms a spherical pair with the fourth lower connecting block.

[0030] In the above solution, the fourth upper connecting block is fixedly connected to the carrier to realize the connection between the fourth force measuring unit and the carrier; the fourth gravity sensor is fixedly connected to the base to realize the connection between the fourth force measuring unit and the base; the upper end of the fourth middle connecting block forms a planar pair with the fourth upper connecting block, reserving a release space for the horizontal force of the fourth upper connecting block, so as to release the deformation and stress of the carrier in the horizontal plane and eliminate the influence of external horizontal forces on the fourth upper connecting block; the lower end of the fourth middle connecting block forms a spherical pair with the fourth lower connecting block, which can ensure that the load force of the carrier is vertically transmitted downward through the center of the spherical pair to the fourth gravity sensor to ensure the detection accuracy.

[0031] In some embodiments of the present application, the fourth force measuring unit includes: a fourth upper connecting block fixedly connected to the carrier; a fourth gravity sensor fixedly connected to the base; a fourth lower connecting block disposed between the fourth upper connecting block and the fourth gravity sensor, and the fourth lower connecting block is fixedly connected to the fourth gravity sensor; a fourth middle connecting block located below the fourth upper connecting block and forming a linear moving pair with the fourth upper connecting block along a first horizontal direction; a fifth middle connecting block disposed between the fourth middle connecting block and the fourth lower connecting block, the upper end of the fifth middle connecting block forms a linear moving pair with the fourth middle connecting block along a second horizontal direction, and the lower end of the fifth middle connecting block forms a spherical pair with the fourth lower connecting block.

[0032] In the above solution, the fourth upper connecting block is fixedly connected to the carrier to realize the connection between the fourth force measuring unit and the carrier; the fourth gravity sensor is fixedly connected to the base to realize the connection between the fourth force measuring unit and the base; the fourth middle connecting block forms a linear moving pair with the fourth upper connecting block along the first horizontal direction, reserving a release space for the horizontal force of the fourth upper connecting block, so as to release the deformation and stress of the carrier in the first horizontal direction and eliminate the influence of external horizontal forces on the fourth upper connecting block; the upper end of the fifth middle connecting block forms a linear moving pair with the fourth middle connecting block along the second horizontal direction, reserving a release space for the horizontal force of the fourth middle connecting block, so as to release the deformation and stress of the carrier in the second horizontal direction and eliminate the influence of external horizontal forces on the fourth middle connecting block; the lower end of the fifth middle connecting block forms a spherical pair with the fourth lower connecting block, which can ensure that the load force of the carrier is vertically transmitted downward through the center of the spherical pair to the fourth gravity sensor to ensure the detection accuracy.

[0033] In some embodiments of the present application, the fourth force measuring unit includes: a fourth upper connecting block fixedly connected to the carrier; a fourth gravity sensor fixedly connected to the base; a fourth lower connecting block disposed between the fourth upper connecting block and the fourth gravity sensor, and the fourth lower connecting block is fixedly connected to the fourth gravity sensor; a fourth middle connecting block located below the fourth upper connecting block, and forms a linear moving pair with the fourth upper connecting block along the second horizontal direction; a fifth middle connecting block disposed between the fourth middle connecting block and the fourth lower connecting block, the upper end of the fifth middle connecting block forms a linear moving pair with the fourth middle connecting block along the first horizontal direction, and the lower end of the fifth middle connecting block forms a spherical pair with the fourth lower connecting block.

[0034] In the above solution, the connection between the fourth force measuring unit and the carrier is realized by fixedly connecting the fourth upper connecting block to the carrier; the connection between the fourth force measuring unit and the base is realized by fixedly connecting the fourth gravity sensor to the base; by forming a linear moving pair between the fourth middle connecting block and the fourth upper connecting block along the second horizontal direction, a release space for the horizontal force of the fourth upper connecting block is reserved, so as to release the deformation and stress of the carrier in the second horizontal direction, and the influence of the external horizontal force on the fourth upper connecting block can be eliminated; by forming a linear moving pair between the upper end of the fifth middle connecting block and the fourth middle connecting block along the first horizontal direction, a release space for the horizontal force of the fourth middle connecting block is reserved, so as to release the deformation and stress of the carrier in the first horizontal direction, and the influence of the external horizontal force on the fourth middle connecting block can be eliminated; by forming a spherical pair between the lower end of the fifth middle connecting block and the fourth lower connecting block, it can ensure that the load force of the carrier is vertically transmitted downward through the center of the spherical pair to the fourth gravity sensor to ensure the detection accuracy.

[0035] In the present application, the relative positions of the spherical pair, the moving pair, and the sensor can be arbitrarily combined from top to bottom, including but not limited to: spherical pair, moving pair, sensor; spherical pair, sensor, moving pair; moving pair, sensor, spherical pair, etc. Any interchange of the positions of the above three that can achieve the release of thermal expansion and contraction deformation and stress, reduce the influence of deformation on the detection accuracy, and the function of fixing the carrier falls within the protection scope of the present application.

[0036] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 Schematic layout diagram of each force measuring unit of the gravity detection device provided by an embodiment of the present application;

[0039] Figure 2 Cross-sectional view of the second force measuring unit and the fourth force measuring unit of the gravity detection device provided by an embodiment of the present application;

[0040] Figure 3 Cross-sectional view of the first force measuring unit and the third force measuring unit of the gravity detection device provided by an embodiment of the present application;

[0041] Figure 4 Schematic diagram of the spherical pair of the force measuring unit of the gravity detection device provided by an embodiment of the present application;

[0042] Figure 5 Cross-sectional view of the fourth force measuring unit of the gravity detection device provided by an embodiment of the present application;

[0043] Figure 6 Cross-sectional view of the fourth force measuring unit of the gravity detection device provided by another embodiment of the present application;

[0044] Figure 7 Cross-sectional view of the fourth force measuring unit of the gravity detection device provided by yet another embodiment of the present application;

[0045] Figure 8 Cross-sectional view of the second force measuring unit of the gravity detection device provided by an embodiment of the present application.

[0046] Icons: 1000 - Gravity detection device; 101 - Upper connection block; 102 - Gravity sensor; 103 - Lower connection block; 1031 - Mounting hole; 1032 - Small diameter section; 1033 - Large diameter section; 11 - First force measuring unit; 111 - First upper connection block; 112 - First gravity sensor; 113 - First lower connection block; 12 - Second force measuring unit; 121 - Second upper connection block; 122 - Second gravity sensor; 123 - Second lower connection block; 124 - Second middle connection block; 13 - Third force measuring unit; 131 - Third upper connection block; 132 - Third gravity sensor; 133 - Third lower connection block; 134 - Third middle connection block; 14 - Fourth force measuring unit; 141 - Fourth upper connection block; 1411 - Groove; 142 - Fourth gravity sensor; 143 - Fourth lower connection block; 144 - Fourth middle connection block; 145 - T-shaped protrusion; 1451 - Vertical section; 1452 - Horizontal section; 146 - End cover plate; 147 - Fifth middle connection block; 151 - Slide block; 152 - Slide groove; 161 - First bolt; 162 - Second bolt; 163 - Third bolt; 164 - First positioning hole; 165 - Second positioning hole; 166 - Third positioning hole; 17 - Limit block; 18 - Spherical pair; 180 - Spherical plain bearing; 181 - Ball head body; 182 - Outer ring; 183 - Connecting rod; 200 - Carrier; 300 - Foundation; X - First horizontal direction; Y - Second horizontal direction; Z - Vertical direction. Detailed implementation manners

[0047] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0049] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0051] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] The gravity detection device according to an embodiment of one aspect of the present application will be described below with reference to the drawings.

[0053] As Figures 1 - 8 shown, the gravity detection device 1000 according to an embodiment of the present application includes: a carrier 200, a base 300, and a force measuring module.

[0054] Specifically, the carrier 200 is used to carry the object to be detected and can be understood as a weighing body. The base 300 is located below the carrier 200 and is used to realize the installation and positioning of the entire gravity detection device 1000. The force measuring module is arranged between the carrier 200 and the base 300, and is used to fix the carrier 200 to the base 300, and is configured to allow the carrier 200 to deform to release internal stress when the carrier 200 undergoes thermal expansion and contraction. The force measuring module can detect the gravity of the object to be detected carried by the carrier 200.

[0055] For the gravity detection device 1000 according to an embodiment of the present application, the carrier 200 and the base 300 are connected and fixed through the force measuring module, preventing the carrier 200 from shaking relative to the base 300. When the carrier 200 undergoes thermal expansion and contraction, it can allow the carrier 200 to deform to release internal stress, reducing the influence of thermal expansion and contraction of the carrier 200 on the weighing accuracy, and ensuring the gravity detection accuracy of the object to be detected carried by the carrier 200.

[0056] In some embodiments of the present application, the force measuring module can limit the vertical force (i.e., the force in the vertical direction) generated by the internal stress of the carrier 200 in the vertical direction; at the same time, the force measuring module can allow the carrier 200 to have a predetermined translational freedom in the first horizontal direction and the second horizontal direction on the same horizontal plane with a fixed point as the fulcrum. Wherein, the vertical direction is parallel to the center line of the carrier 200, and the horizontal direction is perpendicular to the center line of the carrier 200.

[0057] It can be understood that through the force measuring module, the carrier 200 is fixed by a fixed point, the vertical force generated by the internal stress of the carrier 200 is restricted, and with this fixed point as the fulcrum, the thermal expansion and contraction deformation and internal stress are released in the first horizontal direction and the second horizontal direction in the horizontal plane, thereby reducing the influence of the internal stress of the carrier 200 on the weighing accuracy. Having a predetermined translational freedom in the first horizontal direction and the second horizontal direction means allowing the carrier 200 to have translational freedom in the first horizontal direction and the second horizontal direction.

[0058] As Figures 1 - 3 As shown, the force measuring module includes four force measuring units. The four force measuring units are circumferentially arrayed around the center line of the carrier 200. The carrier 200 is connected to the base 300 through the four force measuring units to realize the relative fixation of the position of the carrier 200 to the base 300, so as to detect the load force of the carrier 200 through the four force measuring units and ensure the detection accuracy of the load force of the carrier 200. Among them, the four force measuring units are respectively the first force measuring unit 11, the second force measuring unit 12, the third force measuring unit 13 and the fourth force measuring unit 14. The first force measuring unit 11 and the fourth force measuring unit 14 are arranged diagonally. The second force measuring unit 12 and the third force measuring unit 13 are arranged diagonally. The second force measuring unit 12 and the first force measuring unit 11 are spaced along the first horizontal direction X, that is, the connecting line between the centers of the second force measuring unit 12 and the first force measuring unit 11 extends along the first horizontal direction X; the third force measuring unit 13 and the first force measuring unit 11 are spaced along the second horizontal direction Y perpendicular to the first horizontal direction X, that is, the connecting line between the centers of the third force measuring unit 13 and the first force measuring unit 11 extends along the second horizontal direction Y; the first force measuring unit 11 is configured to limit the translational freedom of the carrier 200 along the first horizontal direction X and the second horizontal direction Y; the second force measuring unit 12 is configured to allow the translational freedom of the carrier 200 along the first horizontal direction X and limit the translational freedom of the carrier 200 along the second horizontal direction Y; the third force measuring unit 13 is configured to allow the translational freedom of the carrier 200 along the second horizontal direction Y and limit the translational freedom of the carrier 200 along the first horizontal direction X; the fourth force measuring unit 14 is configured to allow the translational freedom of the carrier 200 along the first horizontal direction X and the second horizontal direction Y.

[0059] When the carrier 200 deforms in the first horizontal direction X due to thermal expansion and contraction, since the second force measuring unit 12 is configured to allow the carrier 200 to have translational freedom in the first horizontal direction X, and the fourth force measuring unit 14 is configured to allow the carrier 200 to have translational freedom in the first horizontal direction X and the second horizontal direction Y, the deformation and stress of the carrier 200 can be released in the first horizontal direction X via the second force measuring unit 12 and the fourth force measuring unit 14. Similarly, when the carrier 200 deforms in the second horizontal direction Y due to thermal expansion and contraction, the deformation and stress of the carrier 200 can be released in the second horizontal direction Y via the third force measuring unit 13 and the fourth force measuring unit 14.

[0060] According to the gravity detection device 1000 of the embodiment of the present application, the gravity of the object to be detected carried by the carrier 200 is detected by four force measuring units; the carrier 200 is limited in the horizontal plane (the plane formed by the first horizontal direction X and the second horizontal direction Y) by four force measuring units to ensure that the position of the carrier 200 relative to the base 300 is fixed; the deformation and stress of the carrier 200 during thermal expansion and contraction are released in the horizontal plane via the second force measuring unit 12, the third force measuring unit 13 and the fourth detection unit, reducing the influence of thermal expansion and contraction on the weighing accuracy and ensuring the detection accuracy.

[0061] It should be noted that the direction coordinates mentioned in the present application refer to Figures 1 - 3 As shown, X represents the first horizontal direction, Y represents the second horizontal direction, and Z represents the vertical direction, that is, the setting direction of the carrier and the base. The vertical direction Z is perpendicular to the first horizontal direction X and the second horizontal direction Y respectively.

[0062] In some embodiments, as Figure 4 shown, each force measuring unit includes a gravity sensor 102 and a spherical pair 18. The gravity sensor 102 is fixedly connected to the base 300, and the carrier 200 and the gravity sensor 102 are connected through the spherical pair 18. Since each force measuring unit has a spherical pair 18, the connection between the carrier 200 and the gravity sensor 102 is realized through the spherical pair 18, ensuring that the load force borne by the carrier 200 can be vertically downward and ensuring the detection accuracy.

[0063] In some embodiments, the central axis of the gravity sensor 102 is arranged along the vertical direction Z and passes through the center of the spherical pair 18. Since the central axis of the gravity sensor 102 extends along the vertical direction Z and the central axis of the gravity sensor 102 passes through the center of the spherical pair 18, it can ensure that the load force borne by the carrier 200 is vertically downward transmitted through the center of the gravity sensor 102, thereby improving the detection accuracy and preventing the influence of the component force generated by non-coaxiality on the gravity sensor 102 from affecting the detection accuracy. It should be noted that the center of the spherical pair 18 can be understood as the center of the sphere of the spherical pair 18.

[0064] In some embodiments, such as Figure 3 shown, the first force measuring unit 11 includes a first upper connecting block 111, a first gravity sensor 112, and a first lower connecting block 113. The first upper connecting block 111 is fixedly connected to the carrier 200, and the first gravity sensor 112 is fixedly connected to the base 300, thereby realizing the connection of the first force measuring unit 11 to the carrier 200 and the base 300. The first lower connecting block 113 is disposed between the first upper connecting block 111 and the first gravity sensor 112. The first lower connecting block 113 is fixedly connected to the first gravity sensor 112, and the first lower connecting block 113 is fixedly connected to the first gravity sensor 112 and forms a spherical pair 18 with the first upper connecting block 111. By forming the spherical pair 18 between the first lower connecting block 113 and the first upper connecting block 111, it can ensure that the load force of the carrier 200 is vertically transmitted downward through the center of the spherical pair 18 to the first gravity sensor 112 to ensure the detection accuracy.

[0065] The first upper connecting block 111 is fixedly connected to the carrier 200, the first lower connecting block 113 is fixedly connected to the first gravity sensor 112, the first gravity sensor 112 is fixedly connected to the base 300, and the first lower connecting block 113 forms a spherical pair 18 with the first upper connecting block 111, so that at the position of the first force measuring unit 11, the carrier 200 cannot move along the first horizontal direction X and the second horizontal direction Y, that is, the carrier 200 cannot translate in the horizontal plane and can swing through the spherical pair 18.

[0066] In some embodiments, such as Figure 2As shown, the second force measuring unit 12 includes a second upper connection block 121, a second gravity sensor 122, a second lower connection block 123, and a second middle connection block 124. The second upper connection block 121 is fixedly connected to the carrier 200, and the second gravity sensor 122 is fixedly connected to the base 300, thereby realizing the connection of the second force measuring unit 12 to the carrier 200 and the base 300. The second lower connection block 123 is disposed between the second upper connection block 121 and the second gravity sensor 122, and the second lower connection block 123 is fixedly connected to the second gravity sensor 122, so that the second lower connection block 123 can transfer the load force of the carrier 200 to the second gravity sensor 122. The upper end of the second middle connection block 124 forms a linear moving pair with the second upper connection block 121 along the first horizontal direction X, reserving a release space for the horizontal force acting on the second upper connection block 121. The carrier 200 can drive the second upper connection block 121 to move relative to the second middle connection block 124 along the first horizontal direction X to release the deformation and stress of the carrier 200 in the first horizontal direction X, and the influence of the external horizontal force on the second upper connection block 121 can be eliminated. The lower end of the second middle connection block 124 forms a spherical pair 18 with the second lower connection block 123, which can ensure that the load force of the carrier 200 is vertically downward transmitted to the second gravity sensor 122 through the center of the spherical pair 18 to ensure the detection accuracy.

[0067] In some embodiments, as Figure 3 shown, the third force measuring unit 13 includes a third upper connection block 131, a third gravity sensor 132, a third lower connection block 133, and a third middle connection block 134. The third upper connection block 131 is fixedly connected to the carrier 200, and the third gravity sensor 132 is fixedly connected to the base 300, thereby realizing the connection of the third force measuring unit 13 to the carrier 200 and the base 300. The third lower connection block 133 is disposed between the third upper connection block 131 and the third gravity sensor 132, and the third lower connection block 133 is fixedly connected to the third gravity sensor 132, so that the third lower connection block 133 can transfer the load force of the carrier 200 to the third gravity sensor 132. The upper end of the third middle connection block 134 forms a linear moving pair with the third upper connection block 131 along the second horizontal direction Y, reserving a release space for the horizontal force of the third upper connection block 131. The carrier 200 can drive the third upper connection block 131 to move relative to the third middle connection block 134 along the second horizontal direction Y to release the deformation and stress of the carrier 200 in the second horizontal direction Y, and the influence of the external horizontal force on the third upper connection block 131 can be eliminated. The lower end of the third middle connection block 134 forms a spherical pair 18 with the third lower connection block 133, which can ensure that the load force of the carrier 200 is vertically downward transmitted to the third gravity sensor 132 through the center of the spherical pair 18 to ensure the detection accuracy.

[0068] In some embodiments, asFigure 2 As shown in the figure, the fourth force measuring unit 14 includes a fourth upper connecting block 141, a fourth gravity sensor 142, a fourth lower connecting block 143 and a fourth middle connecting block 144. The fourth upper connecting block 141 is fixedly connected to the carrier 200, and the fourth gravity sensor 142 is fixedly connected to the base 300, thereby realizing the connection of the fourth force measuring unit 14 to the carrier 200 and the base 300. The fourth lower connecting block 143 is arranged between the fourth upper connecting block 141 and the fourth gravity sensor 142, and the fourth lower connecting block 143 is fixedly connected to the fourth gravity sensor 142, so that the fourth lower connecting block 143 can transfer the load force of the carrier 200 to the fourth gravity sensor 142. The upper end of the fourth middle connecting block 144 forms a planar pair with the fourth upper connecting block 141, reserving a release space for the horizontal force of the fourth upper connecting block 141. The carrier 200 can drive the fourth upper connecting block 141 to move relative to the fourth middle connecting block 144 within the horizontal plane formed by the first horizontal direction X and the second horizontal direction Y, so as to release the deformation and stress of the carrier 200 within the horizontal plane, and the influence of external horizontal force on the fourth upper connecting block 141 can be eliminated. The lower end of the fourth middle connecting block 144 forms a spherical pair 18 with the fourth lower connecting block 143, which can ensure that the load force of the carrier 200 is vertically downward transmitted to the fourth gravity sensor 142 through the center of the spherical pair 18 to ensure the detection accuracy.

[0069] In some embodiments, as Figure 5 shown, the upper end of the fourth upper connecting block 141 is fixedly connected to the carrier 200, and a groove 1411 is provided at the lower end of the fourth upper connecting block 141; a T-shaped protrusion 145 is provided at the upper end of the fourth middle connecting block 144. The T-shaped protrusion 145 includes a vertical section 1451 and a horizontal section 1452. The lower end of the vertical section 1451 is formed at the upper end of the fourth middle connecting block 144, and the horizontal section 1452 is connected to or integrally formed with the upper end of the vertical section 1451. The horizontal section 1452 is located within the groove 1411 and is in sliding fit with the bottom of the groove 1411 to form a planar pair. In other embodiments, the horizontal section 1452 and the bottom of the groove 1411 can also be in rolling fit through balls.

[0070] In order to limit the position of the fourth middle connecting block 144 in the vertical direction Z, the fourth force measuring unit 14 further includes an end cover plate 146. The end cover plate 146 is installed at the lower end of the fourth upper connecting block 141 and blocks the opening of the groove 1411. The end cover plate 146 is provided with a through hole (not shown in the figure) for the vertical section 1451 to pass through. The vertical section 1451 passes through the through hole and is in movable fit with the end cover plate 146. The lower end surface of the horizontal section 1452 abuts against the surface of the end cover plate 146 facing the fourth upper connecting block 141, and the horizontal section 1452 is in sliding fit with the end cover plate 146.

[0071] In some embodiments, asFigure 6 As shown, the fourth force measuring unit 14 includes a fourth upper connecting block 141, a fourth gravity sensor 142, a fourth lower connecting block 143, a fourth middle connecting block 144 and a fifth middle connecting block 147. The fourth upper connecting block 141 is fixedly connected to the carrier 200, and the fourth gravity sensor 142 is fixedly connected to the base 300, realizing the connection of the fourth force measuring unit 14 to the carrier 200 and the base 300. The fourth lower connecting block 143 is disposed between the fourth upper connecting block 141 and the fourth gravity sensor 142, and the fourth lower connecting block 143 is fixedly connected to the fourth gravity sensor 142, so that the fourth lower connecting block 143 can transfer the load force of the carrier 200 to the fourth gravity sensor 142. The fourth middle connecting block 144 is located below the fourth upper connecting block 141. The fourth middle connecting block 144 and the fourth upper connecting block 141 form a linear moving pair along the first horizontal direction X, reserving a release space for the horizontal force of the fourth upper connecting block 141. The carrier 200 can drive the fourth upper connecting block 141 to move relative to the fourth middle connecting block 144 along the first horizontal direction X to release the deformation and stress of the carrier 200 in the first horizontal direction X, and the influence of external horizontal force on the fourth upper connecting block 141 can be eliminated. The fifth middle connecting block 147 is located between the fourth middle connecting block 144 and the fourth lower connecting block 143. The upper end of the fifth middle connecting block 147 and the fourth middle connecting block 144 form a linear moving pair along the second horizontal direction Y, reserving a release space for the horizontal force of the fourth middle connecting block 144. The fourth middle connecting block 144 can move relative to the fifth middle connecting block 147 along the second horizontal direction Y, so that the carrier 200 and the fourth upper connecting block 141 follow the fourth middle connecting block 144 to move in the second horizontal direction Y, thereby releasing the deformation and stress of the carrier 200 in the second horizontal direction Y, and the influence of external horizontal force on the fourth middle connecting block 144 can be eliminated. The lower end of the fifth middle connecting block 147 and the fourth lower connecting block 143 form a spherical pair 18, which can ensure that the load force of the carrier 200 is vertically downward transmitted to the fourth gravity sensor 142 through the center of the spherical pair 18 to ensure the detection accuracy.

[0072] In some embodiments, such as Figure 7As shown in the figure, the fourth force measuring unit 14 includes a fourth upper connecting block 141, a fourth gravity sensor 142, a fourth lower connecting block 143, a fourth middle connecting block 144 and a fifth middle connecting block 147. The fourth upper connecting block 141 is fixedly connected to the carrier 200, and the fourth gravity sensor 142 is fixedly connected to the base 300, realizing the connection of the fourth force measuring unit 14 with the carrier 200 and the base 300. The fourth lower connecting block 143 is arranged between the fourth upper connecting block 141 and the fourth gravity sensor 142, and the fourth lower connecting block 143 is fixedly connected to the fourth gravity sensor 142, so that the fourth lower connecting block 143 can transfer the load force of the carrier 200 to the fourth gravity sensor 142. The fourth middle connecting block 144 is located below the fourth upper connecting block 141. The fourth middle connecting block 144 and the fourth upper connecting block 141 form a linear moving pair along the second horizontal direction Y, reserving a release space for the horizontal force of the fourth upper connecting block 141. The carrier 200 can drive the fourth upper connecting block 141 to move relative to the fourth middle connecting block 144 along the second horizontal direction Y to release the deformation and stress of the carrier 200 in the second horizontal direction Y, and the influence of external horizontal force on the fourth upper connecting block 141 can be eliminated. The fifth middle connecting block 147 is located between the fourth middle connecting block 144 and the fourth lower connecting block 143. The upper end of the fifth middle connecting block 147 and the fourth middle connecting block 144 form a linear moving pair along the first horizontal direction X, reserving a release space for the horizontal force of the fourth middle connecting block 144. The fourth middle connecting block 144 can move relative to the fifth middle connecting block 147 along the first horizontal direction X, so that the carrier 200 and the fourth upper connecting block 141 follow the fourth middle connecting block 144 to move in the first horizontal direction X, thereby releasing the deformation and stress of the carrier 200 in the first horizontal direction X, and the influence of external horizontal force on the fourth middle connecting block 144 can be eliminated. The lower end of the fifth middle connecting block 147 and the fourth lower connecting block 143 form a spherical pair 18, which can ensure that the load force of the carrier 200 is vertically downward transmitted to the fourth gravity sensor 142 through the center of the spherical pair 18 to ensure the detection accuracy.

[0073] In some embodiments, the centerlines of the components (e.g., the upper connection block, the lower connection block, the gravity sensor, the middle connection block) along the vertical direction Z in each force measuring unit coincide, facilitating the transfer of the load force of the carrier along the vertical direction Z to ensure the accuracy of gravity detection. It should be noted that the upper connection block is a general term for the first upper connection block 111, the second upper connection block 121, the third upper connection block 131, and the fourth upper connection block 141; the lower connection block is a general term for the first lower connection block 113, the second lower connection block 123, the third lower connection block 133, and the fourth lower connection block 143; the gravity sensor 102 is a general term for the first gravity sensor 112, the second gravity sensor 122, the third gravity sensor 132, and the fourth gravity sensor 142; the middle connection block refers to a general term for the second middle connection block 124, the third middle connection block 134, the fourth middle connection block 144, and the fifth middle connection block 147.

[0074] In the above embodiments, the structure of the linear moving pair can be a slider and chute structure. For example, as Figure 8 shown, a slider 151 is provided at the upper end of the second middle connection block 124, and a chute 152 corresponding to the slider 151 is provided at the lower end of the second upper connection block 121. The slider 151 is configured to be slidably engaged with the chute 152, and the slider 151 extends along the first horizontal direction X to realize the movement of the second upper connection block 121 relative to the second middle connection block 124 along the first horizontal direction X.

[0075] In some embodiments, the chute 152 can be a dovetail groove (as Figure 8 shown) or a T-shaped groove to realize the limit of the two components forming the linear moving pair in the vertical direction Z and ensure better bearing capacity.

[0076] In some embodiments, as Figure 4 shown, the carrier 200 and the upper connection block 101 are detachably and fixedly connected by a first bolt 161, the lower connection block 103 and the gravity sensor 102 are detachably and fixedly connected by a second bolt 162, and the gravity sensor 102 and the base 300 are detachably and fixedly connected by a third bolt 163.

[0077] For example, the carrier 200 is provided with a first positioning hole 164 that penetrates the carrier 200 along the vertical direction Z, and the first bolt 161 passes through the first positioning hole 164 and is threadedly connected to the upper connection block 101; the gravity sensor 102 is provided with a second positioning hole 165 that penetrates the gravity sensor 102 along the vertical direction Z, and the second bolt 162 passes through the second positioning hole 165 and is threadedly connected to the lower end of the lower connection block 103; a connection flange is formed at the lower end of the gravity sensor 102, and the connection flange is provided with a third positioning hole 166, and the third bolt 163 passes through the third positioning hole 166 and is threadedly connected to the base 300.

[0078] In some embodiments, the connections between the lower end of the first upper connection block 111 and the first lower connection block 113, between the lower end of the second middle connection block 124 and the second lower connection block 123, between the lower end of the third middle connection block 134 and the third lower connection block 133, between the lower end of the fourth middle connection block 144 and the fourth lower connection block 143, and between the lower end of the fifth middle connection block 147 and the fourth lower connection block 143 are all connected through spherical plain bearings 180 to form a spherical pair 18. As Figure 4 shown, the spherical plain bearing 180 includes a ball head body 181 and an outer ring 182. The inner wall of the outer ring 182 is an inner spherical surface corresponding to the ball head body 181, and the ball head body 181 and the outer ring 182 form a spherical sliding fit; the ball head body 181 is connected to the lower end of the first upper connection block 111 (or the second middle connection block 124, or the third middle connection block 134, or the fourth middle connection block 144, or the fifth middle connection block 147) through a connecting rod 183, and the outer ring 182 is arranged on the lower connection block 103. In other embodiments, the structure of the spherical pair 18 can also be formed by two other components with spherical surfaces to form a spherical sliding fit, such as two annular structures, where one annular structure has an inner spherical surface and the other annular structure has an outer spherical surface, and the inner spherical surface and the outer spherical surface form a spherical sliding fit.

[0079] In some embodiments, as Figure 4 shown, each lower connection block 103 is provided with a mounting hole 1031. The mounting hole 1031 extends along the vertical direction Z, and the mounting hole 1031 is opened on the side of the lower connection block 103 facing away from the gravity sensor 102. The outer ring 182 is arranged in the mounting hole 1031 to realize the mounting and positioning of the outer ring 182. To ensure that the ball head body 181 can rotate relative to the outer ring 182, the mounting hole 1031 is a stepped hole. The small-diameter section 1032 of the stepped hole is close to the gravity sensor 102, the outer ring 182 is located in the large-diameter section 1033 of the stepped hole, and part of the ball head body 181 is located in the small-diameter section 1032.

[0080] In some embodiments, as Figure 4 shown, to limit the movement of the ball head body 181 in the mounting hole 1031 along the vertical direction Z, a limiting block 17 is arranged in the mounting hole 1031. The limiting block 17 is used to cooperate with the mounting hole 1031 to limit the ball head body 181 in the mounting hole 1031. The limiting block 17 can be an annular structure, such as a threaded sleeve, a snap ring, an elastic retaining ring, etc. The limiting block 17 can also be a plurality of block structures distributed circumferentially along the mounting hole 1031, and the block structure is detachably connected to the lower connection block 103 to facilitate the maintenance and replacement of the spherical plain bearing 180.

[0081] In some embodiments, each force measuring unit is a cylindrical structure, which is convenient for processing.

[0082] In some embodiments, the gravity detection device 1000 is a weighbridge for detecting the gravity of a vehicle.

[0083] In some embodiments, the foundation 300 is configured to be disposed in a foundation pit on the ground. The surface of the carrier 200 is flush with the ground and fixed in position to facilitate the movement of the object to be detected (such as a vehicle) onto the carrier 200.

[0084] According to the gravity detection device 1000 of the embodiments of the present application, through fixed connection and installation, two degrees of freedom in the horizontal direction are set, and the structural deformation and internal stress of the detection device caused by thermal expansion and contraction are released, overcoming the influence of the above structural deformation and internal stress on the detection accuracy of the force measuring unit, so as to well balance the two functions of fixed installation and adaptation to temperature changes.

[0085] It should be noted that the gravity sensor 102 is not only used to measure gravity (the force in the vertical direction Z), but can also measure the forces in the first horizontal direction X and the second horizontal direction Y simultaneously.

[0086] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0087] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gravity detection device, characterized in that, Comprising: A carrier for carrying an object to be detected; A base located below the carrier; A force measuring module disposed between the carrier and the base and configured to fix the carrier to the base, and configured to allow the carrier to deform to release internal stress when the carrier undergoes thermal expansion and contraction; The force measuring module can limit the vertical force generated by the internal stress of the carrier in the vertical direction, and allows the carrier to have a predetermined translational freedom in the first horizontal direction and the second horizontal direction on the same horizontal plane with a fixed point as a fulcrum; Wherein, the vertical direction is parallel to the center line of the carrier; the horizontal direction is perpendicular to the center line of the carrier; The force measuring module includes four force measuring units, and the four force measuring units are circumferentially arrayed around the center line of the carrier; The four force measuring units are respectively a first force measuring unit, a second force measuring unit, a third force measuring unit and a fourth force measuring unit. The first force measuring unit and the fourth force measuring unit are diagonally arranged. The second force measuring unit and the third force measuring unit are diagonally arranged. The second force measuring unit and the first force measuring unit are spaced apart in the first horizontal direction. The third force measuring unit and the first force measuring unit are spaced apart in the second horizontal direction perpendicular to the first horizontal direction; The first force measuring unit is configured to limit the translational freedom of the carrier in the first horizontal direction and the second horizontal direction; The second force measuring unit is configured to allow the translational freedom of the carrier in the first horizontal direction and limit the translational freedom of the carrier in the second horizontal direction; The third force measuring unit is configured to allow the translational freedom of the carrier in the second horizontal direction and limit the translational freedom of the carrier in the first horizontal direction; The fourth force measuring unit is configured to allow the translational freedom of the carrier in the first horizontal direction and the second horizontal direction.

2. The gravity detection device according to claim 1, wherein, Each of the force measuring units includes a gravity sensor and a spherical pair. The gravity sensor is fixedly connected to the base, and the carrier and the gravity sensor are connected through the spherical pair.

3. The gravity detection device according to claim 2, characterized in that, The center line of the gravity sensor is arranged in the vertical direction and passes through the center of the spherical pair.

4. The gravity detection device according to claim 3, characterized in that, The first force measuring unit includes: A first upper connecting block fixedly connected to the carrier; A first gravity sensor fixedly connected to the base; A first lower connecting block disposed between the first upper connecting block and the first gravity sensor. The first lower connecting block is fixedly connected to the first gravity sensor and forms the spherical pair with the first upper connecting block.

5. The gravity detection device according to claim 3, characterized in that, The second force measuring unit includes: A second upper connecting block fixedly connected to the carrier; A second gravity sensor fixedly connected to the base; A second lower connecting block disposed between the second upper connecting block and the second gravity sensor. The second lower connecting block is fixedly connected to the second gravity sensor; The second middle connecting block is located below the second upper connecting block. The upper end of the second middle connecting block and the second upper connecting block form a linear moving pair along the first horizontal direction, and the lower end of the second middle connecting block and the second lower connecting block form the spherical pair.

6. The gravity detection device according to claim 3, wherein, The third force measuring unit includes: A third upper connecting block fixedly connected to the carrier; A third gravity sensor fixedly connected to the base; A third lower connecting block is arranged between the third upper connecting block and the third gravity sensor, and the third lower connecting block is fixedly connected to the third gravity sensor; A third middle connecting block is located below the third upper connecting block. The upper end of the third middle connecting block and the third upper connecting block form a linear moving pair along the second horizontal direction, and the lower end of the third middle connecting block and the third lower connecting block form the spherical pair.

7. The gravity detection device according to claim 3, characterized in that, The fourth force measuring unit includes: A fourth upper connecting block fixedly connected to the carrier; A fourth gravity sensor fixedly connected to the base; A fourth lower connecting block is arranged between the fourth upper connecting block and the fourth gravity sensor, and the fourth lower connecting block is fixedly connected to the fourth gravity sensor; A fourth middle connecting block is located below the fourth upper connecting block. The upper end of the fourth middle connecting block and the fourth upper connecting block form a planar pair, and the lower end of the fourth middle connecting block and the fourth lower connecting block form the spherical pair.

8. The gravity detection device according to claim 3, characterized in that, The fourth force measuring unit includes: A fourth upper connecting block fixedly connected to the carrier; A fourth gravity sensor fixedly connected to the base; A fourth lower connecting block is arranged between the fourth upper connecting block and the fourth gravity sensor, and the fourth lower connecting block is fixedly connected to the fourth gravity sensor; A fourth middle connecting block is located below the fourth upper connecting block and forms a linear moving pair along the first horizontal direction with the fourth upper connecting block; A fifth middle connecting block is arranged between the fourth middle connecting block and the fourth lower connecting block. The upper end of the fifth middle connecting block and the fourth middle connecting block form a linear moving pair along the second horizontal direction, and the lower end of the fifth middle connecting block and the fourth lower connecting block form the spherical pair.

9. The gravity detection device according to claim 3, characterized in that, The fourth force measuring unit includes: A fourth upper connecting block fixedly connected to the carrier; A fourth gravity sensor fixedly connected to the base; A fourth lower connecting block is arranged between the fourth upper connecting block and the fourth gravity sensor, and the fourth lower connecting block is fixedly connected to the fourth gravity sensor; A fourth middle connecting block is located below the fourth upper connecting block and forms a linear moving pair along the second horizontal direction with the fourth upper connecting block; A fifth middle connecting block is arranged between the fourth middle connecting block and the fourth lower connecting block. The upper end of the fifth middle connecting block and the fourth middle connecting block form a linear moving pair along the first horizontal direction, and the lower end of the fifth middle connecting block and the fourth lower connecting block form the spherical pair.

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