CN211452549U - Weighing sensor - Google Patents

Abstract

The utility model discloses a weighing sensor, which comprises a bearing part, a fixed part, a parallel guide part and a lever, wherein the parallel guide part and the lever are connected with the bearing part and the fixed part; the bearing part extends to the fixing part to form a bearing part additional part; the fixing part extends towards the bearing part to form a fixing part extending part; one end of the first-stage lever is respectively connected with the bearing part additional part and the fixing part extending part, and the connecting part is of a sheet structure; the other end of the first-stage lever is connected with one end of the second-stage lever, one end of the second-stage lever is also connected to the extending part of the fixing part, and the connecting part is also of a sheet structure; the other end of the second-stage lever is connected with a magnetic system; the weighing sensor is integrally processed and formed. Adopt the utility model discloses the structure can satisfy the wide range, the sensor design requirement of small-size demand.

Description

Weighing sensor

Technical Field

The utility model relates to a weighing sensor, especially, balanced weighing sensor of electromagnetic force.

Background

The electromagnetic force compensation type weighing sensor commonly used on the electronic balance at present has different structures and measuring range requirements according to different use conditions, the working principle of the electromagnetic force compensation type weighing sensor is that a lever principle is utilized, small electromagnetic force is used for balancing larger loading force, the structure of a single-stage lever of the weighing sensor with simple structure and low measuring range can meet the weighing requirement, but the single-stage lever structure of the weighing sensor with large measuring range and small volume can not meet the requirement, and a large lever ratio is required to be obtained by adopting a form of a second-stage lever. The second grade lever structure of current weighing sensor technique often adopts the die-casting formula structure of separation, and several big parts on the weighing sensor are formed by the die-casting shaping mode respectively like bearing part, parallel guide part, fixed part, lever, then link together through modes such as screws, and whole weighing sensor structure is complicated, and the part is various, and the assembly time is consuming time longer, and the cost is also higher.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to solve the problems of complex structure, multiple parts, long time consumption of assembly time and high cost of a weighing sensor in the prior art, the weighing sensor is provided.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

the weighing sensor is characterized in that the lever is arranged in a space formed by the bearing part, the fixing part and the parallel guide part, gaps are formed among the lever, the bearing part, the fixing part and the parallel guide part, and the lever comprises a first-stage lever and a second-stage lever;

the bearing part extends to the fixing part to form a bearing part additional part; the fixing part extends towards the bearing part to form a fixing part extending part; a gap is arranged between the bearing part additional part and the fixing part extending part; gaps are also arranged among the levers, the bearing part additional parts and the fixing part extending parts;

one end of the first-stage lever is respectively connected with the bearing part additional part and the fixing part extending part, and the connecting part is of a sheet structure;

the other end of the first-stage lever is connected with one end of the second-stage lever, one end of the second-stage lever is also connected to the extending part of the fixing part, and the connecting part is also of a sheet structure;

the other end of the second-stage lever is connected with a magnetic system;

the weighing sensor is integrally processed and formed.

The space that sets up between this scheme in bearing part additional part and the fixed part extension makes bearing part additional part and fixed part extension be in the state of separation each other, and the size in space in this scheme moreover changes according to lever structural design demand.

In the scheme, the bearing part additional part and the fixing part extending part are positioned in a space formed by the bearing part, the fixing part and the parallel guide part, and accurate force transmission and amplification are realized by matching with the lever structure design.

The sheet structure in the scheme is that the joints of all parts are made into sheet-like shapes by cutting and the like, so that a fulcrum is realized or better force transmission is realized.

The design of this scheme of utilization, the first order lever is transmitted to the loaded power of bearing part to utilize the fulcrum that first order lever and fixed part extension formed, the first power of gaining, and transmit to the second level lever through being connected with the second level lever. And then, the force is increased again by utilizing the second-stage lever and a fulcrum formed by the extension part of the fixing part, and is transmitted to the magnetic system, so that the two-stage lever keeps a balance state by utilizing the electromagnetic force balance principle, and the force loaded by the bearing part is accurately measured through the proportional relation between the force generated by the magnetic system and the lever.

In this scheme, utilize integration processing technology will be at load-bearing part, fixed part, connect the parallel guide part and the lever integrated into one piece of load-bearing part and fixed part. Therefore, the design of the whole structure of the sensor is more compact, and the space is saved. And the types and the number of integrally formed design parts are small, so the cost of processing, assembly, logistics and the like is lower.

Further, an opening, a groove or a through hole is formed in the fixing portion, and the second-stage lever extends from one side of the fixing portion to the other side of the fixing portion through the opening, the groove or the through hole.

In this scheme, the design of the second level lever is the outside that extends to the fixed part to be convenient for the equipment of lever and magnetic system.

Furthermore, a magnetic system installation part is arranged on one side of the fixing part far away from the bearing part.

Further, the other end of the second-stage lever is connected with a coil connecting part, and the coil connecting part is installed in the magnetic system.

In this scheme, the one end of second level lever is connected with the coil connecting portion of installing in the magnetic system to transmit the second level lever with the coil connecting portion of coil linkage with the power that the magnetic system produced, and then keep the force balance of first order lever and second level lever.

Further, the second-stage lever and the coil connecting portion are integrally formed.

In this scheme, the second level lever with coil connecting portion integrated into one piece to reduce the quantity of installation spare part. While also simplifying the structure of the magnetic system.

Further, the sheet structure is provided with at least one slot from the connecting part to one side of the bearing part, or provided with at least one slot from the connecting part to one side of the fixing part, or provided with at least one slot from the connecting part to two sides of the bearing part and the fixing part.

Further, the length of the joint between the first-stage lever and the bearing part additional part from the joint between the first-stage lever and the fixing part extension part is smaller than the length of the joint between the first-stage lever and the second-stage lever from the joint between the first-stage lever and the fixing part extension part; and/or the presence of a gas in the gas,

the length of the joint of the first-stage lever and the second-stage lever from the joint of the second-stage lever and the extension part of the fixing part is smaller than the length of the gravity center of a magnetic system connected with the second-stage lever from the joint of the second-stage lever and the extension part of the fixing part.

Through adjusting the lever proportion of the two sides of the fulcrum in the scheme, the total lever ratio of the second-level lever is improved.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses a weighing sensor structure can obtain less volume, and the weighing sensor of great lever ratio wherein integrates integrative CNC (Computer numerical control), and the processing form makes sensor overall structure compacter, saves space, thereby effectively reduces the part kind and reduces the design, processing, assembly, cost such as commodity circulation. Adopt the utility model discloses the structure can satisfy the wide range, the sensor design requirement of small-size demand.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which like reference numerals refer to like features throughout, and in which:

fig. 1 is a schematic view of a load cell according to an embodiment of the present invention.

Fig. 2 is a schematic perspective sectional view of a weighing sensor according to an embodiment of the present invention.

Fig. 3 is a schematic view of a second lever and coil connecting portion according to another embodiment of the present invention.

[ reference numerals ]

Weighing sensor 1

Bearing part 11

Carrying part main body part 111

Carrying part attachment part 112

Fixed part 12

Fixed part body part 121

First groove 122

Mounting portion 124

First extension 125

Second extension 126

Upper parallel guide unit 131

Lower parallel guide unit 132

Lever 14

First stage lever 141

One end 1412 of the first stage lever

The other end 1413 of the first stage lever

Second stage lever 142

One end 1422 of the second stage lever

The other end 1423 of the second lever

Coil connecting part 143

Detailed Description

The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.

The utility model discloses thereby utilize and integrate integrative CNC processing form, effectively reduce the part kind and reduce the design, processing, assembly, cost such as commodity circulation. And the functions of connection and fulcrum of the traditional reed are realized through the connection of each part in the weighing sensor in a cutting mode, and performance difference and unreliability brought by assembly are avoided.

The following illustrates an implementation of the present invention by way of examples as described below.

As shown in the embodiment shown in fig. 1 and 2, the load cell 1 of the present embodiment includes a bearing portion 11, a fixing portion 12, a parallel guide portion connecting the bearing portion 11 and the fixing portion 12, and a lever 14.

The fixing part 12 is connected with the carrying part 11 by a parallel guide part including an upper parallel guide unit 131 and a lower parallel guide unit 132 parallel to each other, and both ends of the upper parallel guide unit 131 and the lower parallel guide unit 132 are connected to the carrying part 11 and the fixing part 12, respectively. The end of the upper parallel guide unit 131 connecting the bearing part 11 and the fixing part 12 is cut into a sheet structure, and the function of the sheet structure is the same as that of the connecting spring plate in the load cell assembled in the prior art, and will not be described again here. In the embodiment, the mode of cutting into the thin-sheet structure is utilized, so that the weighing sensor is machined into an integrated structure through machining or die-casting matching machining. The end of the lower parallel guide unit 132 connecting the carrier part 11 and the fixing part 12 in this embodiment is also cut into a sheet structure. The parallel guide portion, the fixing portion 12 and the bearing portion 11 form an integrated structure in this embodiment.

The upper parallel guide unit 131 and the lower parallel guide unit 132 in this embodiment have the same sectional length of the end portions connecting both ends of the carrier part 11 and the fixing part 12, respectively. For example, the upper parallel guide unit 131 and the lower parallel guide unit 132 form a rectangular-like shape between the carrier part 11 and the fixing part 12. In another embodiment, openings or holes are further provided on the upper parallel guide unit 131 and the lower parallel guide unit 132 having a rectangular-like shape. In another modification, the number and shape of the openings or holes in the upper parallel guide unit 131 and the lower parallel guide unit 132 may be arbitrarily adjusted.

In still another embodiment, when the upper parallel guide unit 131 has different sectional lengths of the end portions connecting both ends of the bearing part 11 and the fixing part 12, respectively, the distance between both sides of the upper parallel guide unit 131 is gradually changed from the sectional length of the end portion connecting the bearing part to the sectional length of the end portion connecting the fixing part in the direction from the end portion connecting the bearing part 11 to the end portion connecting the fixing part 12. In one modification, the lower parallel guide unit 132 and the upper parallel guide unit 131 have the same shape.

In this embodiment, one end of the carrying part main body 111 of the carrying part 11 connected to the lower parallel guide unit 132 extends toward the fixing part 12 along the direction of the lower parallel guide unit 132 to form a carrying part additional part 112. As shown in fig. 1 and 2, in the present embodiment, the bearing attachment 112 is located in a groove formed in the plane of the lower parallel guide unit 132, so that the area of the bearing attachment 112 in cross section is smaller than that of the bearing main body portion 111. The bearing attachment portion 112 and one end of the lever 14 near the bearing portion 11 are connected by a connecting portion. The portion where the connecting portion and the lever 14 are connected is also cut into a thin plate structure, and the cut thin plate portion fulfills the function of a connecting spring between the carrier attachment portion 112 and the lever 14.

In this embodiment, the connecting portion is cut with a plurality of grooves to adjust the stress on the connecting portion, and those skilled in the art can adjust the number, position, and size of the grooves according to the distribution of the actual stress on the connecting portion. For example, in another embodiment, the connecting part is provided with 2-3 grooves of the same size on the side facing the bearing part 11 and evenly distributed along the length direction of the connecting part to adjust the stress on the connecting part.

And the connecting parts between the components are cut into sheets by the existing processing technology and the requirement of the weighing sensor.

The fixing portion body portion 121 of the fixing portion 12 extends outward along the length direction of the parallel guide portion to mount a mounting portion 124 for mounting a magnetic system. The upper and lower sides of the joint of the fixing portion body 121 and the mounting portion 124 are opened with a first groove 122 and a second groove (not visible in the figure).

The fixing portion main body 121 of the fixing portion 12 further has a first extending portion 125 extending toward the carrier portion 11 along the longitudinal direction of the parallel guide portion. The first extension 125 of the fixing portion 12 further extends toward the lever 14 and the bearing portion 11, and the second extension 126. The first and second extending portions 125 and 126 of the fixing portion 12 are located between the upper and lower parallel guide units 131 and 132 and are separated from each other. Wherein the second extension 126 is separated from the carrier part 11, thereby forming a gap between the second extension 126 and the carrier part 11.

The distance of the space formed between the upper parallel guide unit 131 and the first and second extension parts 125 and 126 of the fixing part 12 is sufficiently large as shown in fig. 1 and 2 so that the lever 14 can be placed in the space formed by the combination of the fixing part body part 121, the upper parallel guide unit 131, and the first and second extension parts 125 and 126 of the fixing part 12. The weighing sensor is compact in structure, small in size, easy to machine and mount and better in performance due to the arrangement structure in the embodiment.

The lever 14 in this embodiment is a two-stage lever structure, the lever 14 and the carrier attachment portion 112 are attached to the one end 1412 of the body portion of the first-stage lever 141, the junction of the carrier attachment portion 112 and the end 1412 is cut into a sheet structure, and the cut sheet portion performs the function of a connection reed between the carrier attachment portion 112 and the first-stage lever 141 of the lever 14.

The other end 1413 of the first-stage lever 141 and the end 1422 of the second-stage lever 142 are connected by a connecting portion which is cut in a thin plate structure, and the cut thin plate portion performs a function of a connecting reed between the first-stage lever 141 and the second-stage lever.

The first-stage lever 141 is also connected to the second extension 126 of the fixing part 12 through an end 1412. The joint between the end 1412 and the second extension 126 is cut into a sheet structure, and the function of the sheet structure is the same as that of the fulcrum spring in the load cell assembled in the prior art, and thus the description is omitted here. That is to say the cut sheet structure fulfills the function of a fulcrum on the second extension 126 of the first-stage lever 141, so that the force loaded on the carrier part 11 is amplified by the leverage at the junction of the end 1412 having the fulcrum function and the second extension 126 and transmitted to the second-stage lever 142.

Wherein a gap is provided between the second extension portion 126 and the connection portion of the carrier attachment portion 112 and the first-stage lever, there is also a gap between the connection of the end 1412 and the second extension portion 126 and the connection of the carrier attachment portion 112 and the end 1412.

The end 1422 of the second-stage lever 142 is also connected to the second extension 126 of the stationary portion 12. Wherein the junction of the end 1422 and the second extension 126 is skived to a leaf structure that functions as a fulcrum for the second-stage lever 142 on the second extension 126. Thereby amplifying and transmitting the force transmitted by the first-stage lever to the other end 1423 of the second-stage lever 142 by the leverage at the junction of the end 1422 having the fulcrum function and the second extension 126. Thereafter, the electromagnetic force received at the other end 1423 of the second-stage lever 142 is calculated by using the principle of electromagnetic force balance, and the magnitude of the force actually applied to the bearing portion 11 is known by using the amplification scale of the lever.

Wherein there is a gap between the junction of the end 1422 and the second extension 126 and the junction of the end 1413 of the first stage lever 141 and the end 1422 of the second stage lever 142. And the junction of end 1422 and second extension 126 is closer to carrier 11 than the junction of end 1413 of first stage lever 141 and end 1422 of second stage lever 142.

That is, the length of the joint of the first-stage lever and the bearing part additional part from the joint of the first-stage lever and the fixing part extension part and the length of the joint of the first-stage lever and the second-stage lever from the joint of the first-stage lever and the fixing part extension part form the lever ratio of the first-stage lever; the length of the joint of the first-stage lever and the second-stage lever from the joint of the second-stage lever and the extension part of the fixing part and the length of the gravity center of a magnetic system connected with the second-stage lever from the joint of the second-stage lever and the extension part of the fixing part form the lever ratio of the second-stage lever. Through the linkage of the two-stage levers, the total lever ratio of the lever 14 is the product of the lever ratios of the first-stage lever and the second-stage lever, so that a larger lever ratio is obtained.

The other end 1423 of the second lever stage 142 passes through the first recess 122 and is coupled to the magnetic system at the mounting portion 124. The structure setting of the two-stage lever of this embodiment makes weighing sensor overall structure compacter, saves space.

In the present embodiment, the connection and the fulcrum between the components are realized by using a cutting structure, that is, in the present embodiment, the fixing portion 12, the parallel guide portion, the bearing portion 11 and the lever 14 are of an integral structure. The number of parts in the weighing sensor is reduced by pre-processing the position of the sheet in the manufacturing process, and the cost and the assembly time are saved.

In particular, the first-stage lever 141 and the second-stage lever 142 are integrally formed in one piece in this embodiment. The lever structure is more compact, and the number of parts for assembly is reduced. In another embodiment, as shown in FIG. 3, the second stage lever 142 and the coil attachment portion 143 are connected at end 1423 and are integrally formed. In this embodiment, relative to the above-mentioned embodiment, lever and coil connecting portion adopt integrative structure for lever structure is compacter, has further reduced the quantity of part equipment.

Of course, the specific shape of the lever 14 is not limited in the above embodiments, and the shape and size of the lever 14 may be arbitrarily adjusted by those skilled in the art according to the shape of the lever receiving space and the opening shape and size of the lever receiving space of the actual load cell.

The weighing sensor in the above embodiment adopts an integrated structure, that is, is formed by integrally processing and forming a whole material, and the integrated structure can be a die-casting integrated structure, a machining integrated structure or an integrated structure obtained by die-casting and machining matching. The design of above-mentioned embodiment has realized in limited size range, obtains great lever ratio, integrates integrative CNC processing form moreover, thereby effectively reduces the part kind and reduces cost such as design, processing, assembly, commodity circulation.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (7)

1. A weighing sensor comprises a bearing part, a fixing part, a parallel guide part and a lever, wherein the parallel guide part and the lever are connected with the bearing part and the fixing part;

the bearing part extends to the fixing part to form a bearing part additional part; the fixing part extends towards the bearing part to form a fixing part extending part; a gap is arranged between the bearing part additional part and the fixing part extending part; gaps are also arranged among the levers, the bearing part additional parts and the fixing part extending parts;

one end of the first-stage lever is respectively connected with the bearing part additional part and the fixing part extending part, and the connecting part is of a sheet structure;

the other end of the first-stage lever is connected with one end of the second-stage lever, one end of the second-stage lever is also connected to the extending part of the fixing part, and the connecting part is also of a sheet structure;

the other end of the second-stage lever is connected with a magnetic system;

the weighing sensor is integrally processed and formed.

2. The load cell of claim 1, wherein the mounting portion is provided with an opening, slot or through hole through which the second stage lever extends from one side of the mounting portion to the other.

3. The load cell of claim 2, wherein the fixed portion is provided with a magnetic system mounting portion on a side remote from the load bearing portion.

4. The load cell of claim 2, wherein the second lever has another end connected to a coil connection portion, the coil connection portion being mounted in the magnetic system.

5. The load cell of claim 4, wherein the second stage lever and the coil connection are integrally formed.

6. The load cell of claim 1, wherein the sheet structure is provided with at least one slot on a side of the connection facing the carrier, or at least one slot on a side of the connection facing the fixed, or at least one slot on both sides of the connection facing the carrier and the fixed.

7. The load cell of any one of claims 1-6, wherein the length of the junction of the primary lever and the carrier attachment portion from the junction of the primary lever and the retainer extension portion is less than the length of the junction of the primary lever and the secondary lever from the junction of the primary lever and the retainer extension portion; and/or the presence of a gas in the gas,

the length of the joint of the first-stage lever and the second-stage lever from the joint of the second-stage lever and the extension part of the fixing part is smaller than the length of the gravity center of a magnetic system connected with the second-stage lever from the joint of the second-stage lever and the extension part of the fixing part.

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