Strain bridge, elastic variable measuring unit comprising strain bridge and mounting method of elastic variable measuring unit
阅读说明:本技术 应变桥、包含应变桥的弹性变量测量单元及其安装方法 (Strain bridge, elastic variable measuring unit comprising strain bridge and mounting method of elastic variable measuring unit ) 是由 赵孝恩 邱祉海 关飞 蔡旭初 陈兆海 于 2020-07-08 设计创作,主要内容包括:本发明属于称重技术领域,特别是涉及应变桥、包含应变桥的弹性变量测量单元及其安装方法,包括至少两个应变桥和一个负载台配合形成弹性变量的测量单元;多个所述的应变桥之间通过第一固定部和第二固定部的连接组成闭合形状;所述负载台均匀的设有多个相同连接端,连接端上下两端面上分别设有对称的连接轴,连接轴接近连接端的端部,且连接轴高于所在端面。多个所述连接端分别位于每个连接腔内,上下对称的连接轴分别位于连接腔上下内壁对称的连接孔内。通过传感器对应变桥的形变进行转换计算,准确的对物体进行称重,而且解决了偏载称重的误差。(The invention belongs to the technical field of weighing, and particularly relates to a strain bridge, an elastic variable measuring unit comprising the strain bridge and an installation method of the elastic variable measuring unit, wherein the elastic variable measuring unit comprises at least two strain bridges and a load platform which are matched to form an elastic variable measuring unit; the strain bridges are connected through a first fixing part and a second fixing part to form a closed shape; the loading platform is uniformly provided with a plurality of same connecting ends, symmetrical connecting shafts are respectively arranged on the upper end face and the lower end face of each connecting end, the connecting shafts are close to the end parts of the connecting ends, and the connecting shafts are higher than the end faces where the connecting shafts are located. The connecting ends are respectively positioned in each connecting cavity, and the connecting shafts which are symmetrical up and down are respectively positioned in the connecting holes which are symmetrical up and down inner walls of the connecting cavities. The deformation of the strain bridge is converted and calculated through the sensor, the object is accurately weighed, and the unbalance loading weighing error is solved.)
1. A strain bridge, characterized by comprising a strain part (11), a first fixing part (12) and a second fixing part (13);
the first fixing part (12) is positioned at the left end of the strain part (11), and the second fixing part (13) is positioned at the right end of the strain part (11);
the upper end surface of the first fixing part (12) is level with the upper end surface of the strain part (11);
the lower end face of the second fixing part (13) is parallel to the lower end face of the strain part (11);
the lower end surface of the first fixing part (12) is coplanar with the upper end surface of the second fixing part (13);
the distance from the lower end surface of the first fixing part (12) to the lower end surface of the strain part (11) is the same as the distance from the upper end surface of the second fixing part (13) to the upper end surface of the strain part (11);
the distance from the lower end face of the first fixing part (12) to the upper end face of the first fixing part (12) is equal to the distance from the lower end face of the second fixing part (13) to the upper end face of the second fixing part (13);
a connecting cavity (111) is arranged in the strain part (11);
the upper inner wall and the lower inner wall of the connecting cavity (111) are respectively provided with a connecting hole (112) and an arc-shaped groove (113) which are symmetrical, and the distance from the axis of the connecting hole (112) to the front end surface of the strain part (11) is equal to the distance from the axis of the connecting hole (112) to the rear end surface of the strain part (11);
the arc-shaped grooves (113) are respectively positioned at four corners of the connecting cavity (111) and positioned on the upper inner wall and the lower inner wall, wherein one end of the arc-shaped groove (113) is connected with one corner;
the connecting holes (112) are respectively positioned at the centers of the upper inner wall and the lower inner wall;
the end surfaces of the first fixing part (12) and the second fixing part (13) are provided with fixing holes; the axis of the fixing hole of the first fixing part (12), the axis of the fixing hole of the second fixing part (13) and the axis of the connecting hole (112) of the strain part (11) are coplanar; the distance from the axis of the fixing hole of the first fixing part (12) to the axis of the connecting hole (112) of the strain part (11) is equal to the distance from the axis of the fixing hole of the second fixing part (13) to the axis of the connecting hole (112) of the strain part (11).
2. An elastic variable measuring unit characterized by: comprising a strain bridge according to claim 1, at least two strain bridges (1) and one load carrier (2) cooperating to form a measurement unit of an elastic variable;
the loading platform (2) is uniformly provided with a plurality of same connecting ends (21), the upper end face and the lower end face of each connecting end (21) are respectively provided with a symmetrical connecting shaft (211), the connecting shafts (211) are close to the end parts of the connecting ends (21), and the connecting shafts (211) are higher than the end faces where the connecting shafts (211) are located.
3. An elastic variable measuring unit according to claim 2, wherein: the strain bridges (1) are connected through a first fixing part (12) and a second fixing part (13) to form a closed shape; the lower end face of the first fixing part (12) is attached to the upper end face of the second fixing part (13), and the first fixing part (12) and the second fixing part (13) are fixed through screws.
4. An elastic variable measuring unit according to claim 3, wherein: the number of the strain bridges is four, and the strain bridges are a first strain bridge, a second strain bridge, a third strain bridge and a fourth strain bridge;
the second fixing part (13) of the first strain bridge is coaxial with the first fixing part (12) of the second strain bridge, and the upper end face of the second fixing part (13) of the first strain bridge is coplanar with the lower end face of the first fixing part (12) of the second strain bridge;
the second fixing part (13) of the second strain bridge is coaxial with the first fixing part (12) of the third strain bridge, and the upper end face of the second fixing part (13) of the second strain bridge is coplanar with the lower end face of the first fixing part (12) of the third strain bridge;
the second fixing part (13) of the third strain bridge is coaxial with the first fixing part (12) of the fourth strain bridge, and the upper end face of the second fixing part (13) of the third strain bridge is coplanar with the lower end face of the first fixing part (12) of the fourth strain bridge;
the second fixing part (13) of the fourth strain bridge is coaxial with the first fixing part (12) of the first strain bridge, and the upper end face of the second fixing part (13) of the fourth strain bridge is coplanar with the lower end face of the first fixing part (12) of the first strain bridge.
5. An elastic variable measuring unit according to claim 2, wherein: the plurality of connecting ends (21) are respectively positioned in each connecting cavity (111), and the connecting shafts (211) which are symmetrical up and down are respectively positioned in the connecting holes (112) which are symmetrical up and down inner walls of the connecting cavities (111).
6. An elastic variable measuring unit according to claim 2, wherein: the number of the connecting ends (21) is matched with the number of the strain bridges (1), and the width of the connecting ends (21) is smaller than that of the connecting cavity (111).
7. An elastic variable measuring unit according to claim 2, wherein: the middle end face of the load bearing platform (2) is provided with a fixing hole.
8. An elastic variable measuring unit according to claim 2, wherein: the strain bridge is characterized in that the strain bridge (1) is made of steel with certain elasticity, and a deformation sensor is arranged on the upper end face of a strain part (11) of the strain bridge (1).
9. A method of mounting an elastic variable measuring unit according to claims 2-8, wherein: the installation method comprises the following steps:
s1: carrying out technical and safety background crossing on workers;
s2: materials enter a field, and are ready to be installed, so that the machine is complete;
s3: each connecting end (21) is placed in the connecting cavity (111), and the connecting shaft (211) is placed in the connecting hole (112) through the arc-shaped groove (113).
S4: after the connecting end (21) of the load bearing platform (2) is placed into the connecting cavity (111), the adjacent strain bridges (1) are fixed on a platform of a working area through the first fixing part (12) and the second fixing part (13), and the connecting part (11) of each strain bridge is attached to the lower end face of the working platform.
S5: and (3) fixing the mechanical arm or the measuring platform through a fixing hole on the end surface of the loading platform (2), wherein the upper end surface of the loading platform (2) is attached to the mounting end surface of the lower part of the mechanical arm or the measuring platform.
Technical Field
The invention belongs to the technical field of weighing, and particularly relates to a strain bridge, an elastic variable measuring unit comprising the strain bridge and an installation method of the elastic variable measuring unit.
Background
At present, a weighing sensor on the market basically puts a weighed object right above a weighing sensor object stage, so that accurate weighing can be realized. If the object exceeds the object stage or is off-set, the weighing accuracy is seriously affected.
Furthermore, with the rapid development of the intelligence in our country, many batch operations are performed using artificial intelligence devices or automation devices, such as manipulators. Snatch the object through intelligent device, place, need weigh the object on grabbing placing weighing device again, then take off after weighing finishing. Therefore, the operation wastes time, increases the repeated operation times of the equipment, shortens the service life of the equipment, increases the cost, and can cause the accuracy of data easily because the volume of an object possibly exceeds the maximum range of an object stage when the object is grabbed and placed on a weighing device.
At present, many weighing apparatus in the prior art need be calibrated after using many times or after certain live time, and the calibration is more loaded down with trivial details, takes trouble and is real.
Disclosure of Invention
1. Technical problem to be solved
The present invention aims at the problems existing in the prior art:
the first purpose of the invention is to provide a strain bridge, two adjacent strain bridges are connected through a first fixing part and a second fixing part, a plurality of strain bridge connections can be connected into a closed shape, and an object can be weighed by placing the object right above the closed shape.
The second purpose of the invention is to provide a strain bridge and an elastic variable measuring unit comprising the strain bridge, wherein the strain bridge and a load platform are matched with each other, so that weighing can be realized in the running process, and weighing errors caused by unbalance loading are solved.
The third purpose of the invention is to provide a strain bridge and a method for installing an elastic variable measuring unit comprising the strain bridge, which have simple structure and are convenient to install.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A strain bridge comprises a strain part, a first fixing part and a second fixing part; the first fixing part is positioned at the left end of the strain part, and the second fixing part is positioned at the right end of the strain part; the upper end surface of the first fixing part is level to the upper end surface of the strain part; the lower end face of the second fixing part is level to the lower end face of the strain part; the lower end face of the first fixing part is coplanar with the upper end face of the second fixing part; the distance from the lower end surface of the first fixing part to the lower end surface of the strain part is the same as the distance from the upper end surface of the second fixing part to the upper end surface of the strain part; the distance from the lower end face of the first fixing part to the upper end face of the first fixing part is equal to the distance from the lower end face of the second fixing part to the upper end face of the second fixing part; a connecting cavity is arranged in the strain part; the upper inner wall and the lower inner wall of the connecting cavity are respectively provided with a connecting hole and an arc-shaped groove which are symmetrical, and the distance from the axis of the connecting hole to the front end surface of the strain part is equal to the distance from the axis of the connecting hole to the rear end surface of the strain part; the arc-shaped grooves are respectively positioned at four corners of the connecting cavity and positioned on the upper inner wall and the lower inner wall, wherein one end of each arc-shaped groove is connected with one corner; the connecting holes are respectively positioned at the centers of the upper inner wall and the lower inner wall; the end surfaces of the first fixing part and the second fixing part are provided with fixing holes; the axis of the fixing hole of the first fixing part, the axis of the fixing hole of the second fixing part and the axis of the connecting hole of the strain part are coplanar; the distance from the axis of the fixing hole of the first fixing portion to the axis of the connecting hole of the strain portion is equal to the distance from the axis of the fixing hole of the second fixing portion to the axis of the connecting hole of the strain portion.
An elastic variable measuring unit comprises the strain bridge, at least two strain bridges and a load bearing platform which are matched to form the elastic variable measuring unit; the loading platform is uniformly provided with a plurality of same connecting ends, symmetrical connecting shafts are respectively arranged on the upper end face and the lower end face of each connecting end, the connecting shafts are close to the end parts of the connecting ends, and the connecting shafts are higher than the end faces where the connecting shafts are located.
Preferably, a plurality of strain bridges are connected through a first fixing part and a second fixing part to form a closed shape; and the lower end face of the first fixing part is attached to the upper end face of the second fixing part, and the first fixing part and the second fixing part are fixed through screws.
Preferably, the number of the strain bridges is four, namely a first strain bridge, a second strain bridge, a third strain bridge and a fourth strain bridge; the second fixing part of the first strain bridge is coaxial with the first fixing part of the second strain bridge, and the upper end surface of the second fixing part of the first strain bridge is coplanar with the lower end surface of the first fixing part of the second strain bridge; the second fixing part of the second strain bridge is coaxial with the first fixing part of the third strain bridge, and the upper end surface of the second fixing part of the second strain bridge is coplanar with the lower end surface of the first fixing part of the third strain bridge; the second fixing part of the third strain bridge is coaxial with the first fixing part of the fourth strain bridge, and the upper end surface of the second fixing part of the third strain bridge is coplanar with the lower end surface of the first fixing part of the fourth strain bridge; the second fixing part of the fourth strain bridge is coaxial with the first fixing part of the first strain bridge, and the upper end face of the second fixing part of the fourth strain bridge is coplanar with the lower end face of the first fixing part of the first strain bridge.
Preferably, the plurality of connecting ends are respectively located in each connecting cavity, and the connecting shafts which are symmetrical up and down are respectively located in the connecting holes which are symmetrical up and down on the inner walls of the connecting cavities.
Preferably, the number of the connecting ends is matched with that of the strain bridges, and the width of each connecting end is smaller than that of each connecting cavity.
Preferably, a fixing hole is arranged on the middle end face of the load table.
Preferably, the material of straining bridge is for having certain elastic steel, is located install deformation sensor on the up end of the portion of straining bridge.
A mounting method of an elastic variable measuring unit, the mounting method comprising the steps of:
s1: carrying out technical and safety background crossing on workers;
s2: materials enter a field, and are ready to be installed, so that the machine is complete;
s3: and each connecting end is placed into the connecting cavity, and the connecting shaft is placed into the connecting hole through the arc-shaped groove.
S4: after the connecting cavity is placed into the connecting end of the load bearing platform, the adjacent strain bridges are fixed on the platform of the working area through the first fixing part and the second fixing part, and the connecting part of each strain bridge is attached to the lower end face of the working platform.
S5: and fixing the mechanical arm or the measuring platform through a fixing hole on the end surface of the load table, wherein the upper end surface of the load table is attached to the mounting end surface of the lower part of the mechanical arm or the measuring platform.
3. Advantageous effects
The strain bridge, the elastic variable measuring unit comprising the strain bridge and the mounting method of the elastic variable measuring unit comprise that a plurality of strain bridges can be connected into a closed shape by connecting a first fixing part and a second fixing part of two adjacent strain bridges, and an object is placed right above the closed shape formed by connecting the plurality of strain bridges for weighing.
The strain bridges, the elastic variable measuring unit comprising the strain bridges and the installation method thereof are characterized in that the strain bridges are connected with the load platform and fixed with the upper end surface of the load platform through a mechanical arm or a weighing platform, so that not only can an object in a normal load state be accurately weighed, but also the problem of accurate weighing of an unbalanced object can be solved.
The strain bridge, the elastic variable measuring unit comprising the strain bridge and the installation method thereof can realize that the current intelligent equipment can accurately weigh an object while circulating the object. Not only saves time, but also reduces the abrasion caused by repeated operation of equipment cost, and prolongs the service life of the equipment to a certain extent. The unbalance loading weighing device is arranged at the bottom end of the equipment, so that the weighing can be realized while the weighing is carried out.
And the strain bridge, the elastic variable measuring unit comprising the strain bridge and the installation method thereof can be customized according to the shape of intelligent equipment, and have the advantages of simple structure, convenience in installation and lower cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a load table according to the present invention;
FIG. 3 is a schematic structural view of a strain bridge of the present invention;
FIG. 4 is a partial cross-sectional view of a strain bridge of the present invention;
FIG. 5 is a schematic view of the load of the present invention in a normal load state;
FIG. 6 is a schematic view of an offset load state of the present invention;
in the figure, 1, strain bridge; 11. the
2. a loading platform; 21. a connecting end 211 and a connecting shaft;
3. a measuring platform;
4. a robot arm.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
As shown in fig. 1 to 6, a strain bridge includes a
A connecting
The connection holes 112 are respectively located on the upper inner wall and the lower inner wall of the
A closed shape is formed by connecting a plurality of
In the scheme, the number of the strain bridges is four, and the strain bridges are a first strain bridge, a second strain bridge, a third strain bridge and a fourth strain bridge; the second fixing
At least two
Specifically, the plurality of connecting ends 21 are respectively located in each connecting
Specifically, the material of straining
A mounting method of an elastic variable measuring unit, the mounting method comprising the steps of:
s1: carrying out technical and safety background crossing on workers;
s2: materials enter a field, and are ready to be installed, so that the machine is complete;
s3: each connecting end 21 of the
S4: after the connecting end 21 of the
When the strain bridge device is used, when an object to be weighed is positioned right above the measuring table, the
The foregoing is only a preferred embodiment of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
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