Fixing device of high-precision metal film box sensor

Abstract

The utility model discloses a fixing device of a high-precision metal film box sensor, which comprises an upper plate and a lower plate, the upper plate and the lower plate are connected through a balance mechanism, a sensor is detachably arranged in an interlayer between the upper plate and the lower plate, an elastic body is arranged in the sensor, a limiting mechanism is arranged at the bottom of the lower plate, and the elastic body is arranged in the limiting mechanism. A base is fixedly installed on the edge of the bottom of the lower plate, and the balance mechanism comprises a fixing block. By arranging the rotating shaft, the supporting rod and the connecting rod, when a weighed object is placed on the top of the upper plate for weighing, if the gravity center of the weighed object deviates from the center of the upper plate and the acting force of the weighed object on the elastic body is not aligned with the center line of the elastic body, the connecting rod is pressed to drive the supporting rod and the rotating shaft to rotate; therefore, the upper plate can be always kept in a horizontal state by the four groups of balance mechanisms, and lateral force cannot be generated on the elastic body, so that the measuring precision is improved, and the measuring device has the advantage of being capable of improving the measuring precision.

Description

Technical Field

[0001] The utility model belongs to the technical field of membrane box sensors, and in particular relates to a fixing device for a high-precision metal membrane box sensor. Background Art

[0002] The metal diaphragm sensor is a sensor that uses a metal diaphragm as a sensitive element, including a weighing sensor. When the medium to be measured acts on the diaphragm, the diaphragm will deform, thereby changing the resistance value in the circuit connected to it. By measuring these changes in the circuit, the physical quantities such as the pressure of the medium to be measured can be indirectly obtained, thereby measuring the weight of the medium to be measured. This type of sensor usually has the characteristics of a small structure and a low height, and is suitable for a variety of environments, especially in the fields of platform weighing, truck scales, track scales and automated measurement and control.

[0003] For example, the publication number is CN207908045U, and the patent title is a utility model patent for a weighing sensor. Its technical solution includes an elastomer, a strain gauge arranged on the elastomer, and a data line connected to the strain gauge. The upper side of the elastomer is connected to a first connecting plate, the upper side of the first connecting plate is connected to a first fixing plate, the first connecting plate and the first fixing plate are detachably connected, the lower side of the elastomer is connected to a second connecting plate, the lower side of the second connecting plate is connected to a second fixing plate, the second connecting plate and the second fixing plate are detachably connected, and the middle of the elastomer is provided with a first circular groove and a second circular groove communicating with each other from the inside to the outside, the inner diameter of the first circular groove is smaller than that of the second circular groove, a strain hole is provided on the bottom surface of the first circular groove, the strain gauge is attached to the bottom surface of the strain hole, the first circular groove and the second circular groove are connected with matching sealing covers, and a waterproof joint is provided on one side of the elastomer. The utility model has the advantages of simple structure, good waterproof effect and easy installation.

[0004] However, this prior art has some problems: during use, the force exerted by the object to be weighed on the elastomer needs to be aligned with the center line of the elastomer. If the force deviates from the center line, lateral force and torsional force will be generated on the elastomer, affecting its weighing accuracy. Therefore, we propose a fixing device for a high-precision metal diaphragm box sensor. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a fixing device for a high-precision metal diaphragm box sensor, which can improve the measurement accuracy by setting a balancing mechanism.

[0006] The utility model is implemented as follows: a fixing device for a high-precision metal diaphragm box sensor comprises an upper plate and a lower plate, the upper plate and the lower plate are connected by a balancing mechanism, a sensor is detachably installed in the interlayer between the upper plate and the lower plate, an elastomer is arranged inside the sensor, a limiting mechanism is arranged at the bottom of the lower plate, a base is fixedly installed at the edge of the bottom of the lower plate, the balancing mechanism comprises a fixing block, four of the fixing blocks are evenly distributed and fixedly installed on the top of the lower plate, a rotating shaft is movably sleeved on the fixing block, both ends of the rotating shaft are fixedly connected with a support rod, and a connecting rod is hinged between the support rod and the upper plate.

[0007] Optionally, a through hole is formed in the middle of the bottom end of the lower plate, and the diameter of the through hole is larger than the diameter of the sensor.

[0008] Optionally, the limiting mechanism includes a rotating rod, one end of which is rotatably connected to the bottom of the lower plate, and the other end of which is threadedly connected to a bolt.

[0009] Optionally, a top block is fixedly connected to the top of the bolt, and a side groove is provided on a side of the rotary rod close to the base.

[0010] Optionally, pins are movably inserted on both sides of the base, one end of the pin extends to the inside of the side groove, and the other end of the pin extends to the outside of the base and is fixedly connected with a handle.

[0011] Optionally, a spring located between the base and the handle is movably sleeved on the outer surface of the latch, and two ends of the spring are respectively fixedly connected to the outer surfaces of the base and the handle.

[0012] Optionally, notches are provided on both sides of the bottom of the lower plate, and the depth of the notches is greater than the thickness of the top block.

[0013] Optionally, a side of the fixing block close to the sensor is arc-shaped, and the fixing block fits the sensor.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. By setting the rotating shaft, the strut and the connecting rod, when the object to be weighed is placed on the top of the upper plate for weighing, if the center of gravity of the object to be weighed deviates from the center of the upper plate, the force exerted on the elastic body is not aligned with the center line of the elastic body. Since the connecting rod is compressed to drive the strut and the rotating shaft to rotate, the four sets of balancing mechanisms can keep the upper plate in a horizontal state at all times, and no lateral force is generated on the elastic body, thereby improving the measurement accuracy.

[0016] 2. By setting a rotary rod, a bolt and a top block, the top block can be moved upward or downward by turning the bolt. When the top block moves upward, the sensor can be installed and fixed. When the sensor needs to be removed, just turn the bolt to move the top block downward, and turn the rotary rod to move the top block out from the bottom of the sensor, so that it is convenient for the staff to disassemble and install the sensor.

[0017] 3. By setting the latch, the handle and the spring, and by setting the spring to a stretched state, the latch will tend to move closer to the rotary rod due to the elastic recovery effect of the spring, so that the latch can maintain a limiting effect on the rotary rod, so that the rotary rod can be stably maintained at the bottom of the lower plate when the device is in use, thereby making the weighing process more stable when the device is in use.

[0018] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram provided by the utility model;

[0020] Figure 2 It is a schematic diagram of the bottom structure provided by the utility model;

[0021] Figure 3 It is a front cross-sectional schematic diagram provided by the utility model;

[0022] Figure 4 It is a schematic diagram of the structure after the rotary rod provided by the utility model is rotated;

[0023] Figure 5 yes Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0024] In the figure: 1, upper plate; 2, lower plate; 3, balancing mechanism; 301, fixing block; 302, rotating shaft; 303, support rod; 304, connecting rod; 4, sensor; 5, through hole; 6, limiting mechanism; 601, rotating rod; 602, bolt; 603, top block; 604, side groove; 7, base; 8, latch; 9, handle; 10, spring; 11, notch; 12, elastomer. DETAILED DESCRIPTION

[0025] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0026] like Figures 1 to 5As shown, a fixing device for a high-precision metal diaphragm box sensor provided by an embodiment of the utility model comprises an upper plate 1 and a lower plate 2, the upper plate 1 and the lower plate 2 are connected by a balancing mechanism 3, a sensor 4 is detachably installed in the interlayer between the upper plate 1 and the lower plate 2, an elastic body 12 is arranged in the sensor 4, during weighing, the object to be weighed is placed on the top of the upper plate 1, the upper plate 1 moves downward under pressure, thereby squeezing the elastic body 12, the elastic body 12 transmits the pressure data received to the inside of the sensor 4, thereby measuring the weight data, a limiting mechanism 6 is provided at the bottom of the lower plate 2, a base 7 is fixedly installed at the edge of the bottom of the lower plate 2, the balancing mechanism 3 comprises a fixed block 301, four fixed blocks 301 are evenly distributed and fixedly installed on the top of the lower plate 2, a rotating shaft 302 is movably sleeved on the fixed block 301, both ends of the rotating shaft 302 are fixedly connected with a support rod 303, and a connecting rod 304 is hinged between the support rod 303 and the upper plate 1.

[0027] When the object to be weighed is placed on the top of the upper plate 1 for weighing, if the center of gravity of the object to be weighed deviates from the center of the upper plate 1, the force exerted on the elastic body 12 is not aligned with the center line of the elastic body 12. Since the connecting rod 304 is compressed to drive the support rod 303 and the rotating shaft 302 to rotate, the four sets of balancing mechanisms 3 can always keep the upper plate 1 in a horizontal state, and no lateral force will be generated on the elastic body 12.

[0028] Furthermore, a through hole 5 is formed in the middle of the bottom end of the lower plate 2, and the diameter of the through hole 5 is larger than the diameter of the sensor 4. The sensor 4 can be placed between the upper plate 1 and the lower plate 2 through the through hole 5.

[0029] Furthermore, the limiting mechanism 6 includes a rotating rod 601, one end of which is rotatably connected to the bottom of the lower plate 2, and the other end of which is threadedly connected to a bolt 602. The rotating rod 601 can be rotated to a suitable position so that the staff can install or remove the sensor 4.

[0030] Furthermore, a top block 603 is fixedly connected to the top of the bolt 602, and a side groove 604 is provided on the side of the rotating rod 601 close to the base 7. By rotating the bolt 602, the top block 603 can be moved upward or downward, so that the sensor 4 can be fixed or removed. At the same time, the staff can also rotate the bolt 602 to adjust the height of the sensor 4, so that the top of the elastic body 12 remains in contact with the upper plate 1, avoiding over-tightening or over-loosening to affect the measurement accuracy.

[0031] Furthermore, both sides of the base 7 are movably connected with a latch 8, one end of the latch 8 extends to the inside of the side groove 604, and the other end of the latch 8 extends to the outside of the base 7 and is fixedly connected with a handle 9. The latch 8 can limit the rotation rod 601, so that the rotation rod 601 is stable at the bottom of the lower plate 2 and does not rotate. By pulling the latch 8 out of the side groove 604, the limiting effect on the rotation rod 601 is released, so that the rotation rod 601 can be rotated to reserve enough space under the through hole 5 for disassembly and assembly of the sensor 4.

[0032] Furthermore, the outer surface of the latch pin 8 is movably sleeved with a spring 10 located between the base 7 and the handle 9, and the two ends of the spring 10 are respectively fixedly connected to the outer surfaces of the base 7 and the handle 9. By setting the spring 10 in a stretched state, the latch pin 8 tends to move closer to the rotating rod 601 due to the elastic force recovery effect of the spring 10, so that the end of the latch pin 8 located inside the side groove 604 is sufficiently stable and will not accidentally slip out to affect the limiting effect on the rotating rod 601.

[0033] Furthermore, notches 11 are provided on both sides of the bottom of the lower plate 2, and the depth of the notches 11 is greater than the thickness of the top block 603. Through the design of the notches 11, after the rotating rod 601 drives the top block 603 to rotate, the top block 603 can be completely moved out from directly below the through hole 5 and move to the inside of the notches 11, so that it is more convenient for the staff to disassemble and assemble the sensor 4.

[0034] Furthermore, the side of the fixing block 301 close to the sensor 4 is arc-shaped, and the fixing block 301 fits the sensor 4. The four fixing blocks 301 can limit the horizontal position of the sensor 4, so that the sensor 4 can be kept just below the center of the upper plate 1, which is more conducive to weighing measurement.

[0035] Working principle: the staff can place the sensor 4 between the upper plate 1 and the lower plate 2 through the through hole 5, and then rotate the rotary rod 601. Due to the rotation of the rotary rod 601, the top block 603 can be driven to rotate from the slot 11 to just below the sensor 4, and the side slot 604 will also rotate to be coaxial with the pin 8. At this time, due to the elastic recovery effect of the spring 10, the end of the pin 8 away from the handle 9 will be inserted into the side slot 604, thereby limiting the rotary rod 601. Then the staff can rotate the bolt 602. Due to the rotation of the bolt 602, the top block 603 will be driven to move upward to fix the sensor 4. At the same time, the staff can also rotate the bolt 602 to adjust the height of the sensor 4, so that the top of the elastomer 12 remains in contact with the upper plate 1 to avoid over-tightening or over-loosening that affects the subsequent measurement accuracy. Similarly, when the staff needs to remove the sensor 4, they only need to loosen the bolt 602 and then rotate the rotary rod 601 until there is enough space at the bottom of the through hole 5 to remove the sensor 4.

[0036] During weighing, when the object to be weighed is placed on the top of the upper plate 1, the upper plate 1 is pressed downward to compress the elastic body 12, and the elastic body 12 transmits the pressure data received to the inside of the sensor 4, thereby measuring the weight data. If the center of gravity of the object to be weighed deviates from the center of the upper plate 1, when the upper plate 1 is pressed and the heavier side moves downward, it will squeeze the connecting rod 304 on this side so that the connecting rod 304 drives the support rod 303 on this side to rotate, thereby causing the rotating shaft 302 to drive the support rod 303 on the other side to rotate. At the same time, since the balancing mechanism 3 is provided with four groups, No matter which side of the top of the upper plate 1 is under pressure and heavier, the four groups of balancing mechanisms 3 restrain each other. Since the connecting rod 304 is under pressure, it drives the support rod 303 and the rotating shaft 302 to rotate. No matter which side the center of gravity of the weighed object is biased towards, the rotation direction of the two support rods 303 on both sides of the rotating shaft 302 will be consistent, so that the upper plate 1 is always kept in a horizontal state, so that when the upper plate 1 is weighed and compressed, the force exerted on the elastic body 12 is always aligned with the center line of the elastic body 12, and no lateral force is generated on the elastic body 12, thereby improving the measurement accuracy.

[0037] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixing device for a high-precision metal diaphragm sensor, comprising an upper plate (1) and a lower plate (2), characterized in that: The upper plate (1) and the lower plate (2) are connected via a balancing mechanism (3); a sensor (4) is detachably installed in the interlayer between the upper plate (1) and the lower plate (2); an elastic body (12) is arranged inside the sensor (4); a limiting mechanism (6) is arranged at the bottom of the lower plate (2); a base (7) is fixedly installed at the edge of the bottom of the lower plate (2); the balancing mechanism (3) comprises a fixed block (301); four fixed blocks (301) are evenly distributed and fixedly installed on the top of the lower plate (2); a rotating shaft (302) is movably sleeved on the fixed block (301); both ends of the rotating shaft (302) are fixedly connected to a support rod (303); a connecting rod (304) is hinged between the support rod (303) and the upper plate (1).

2. A fixing device for a high-precision metal diaphragm sensor according to claim 1, characterized in that: A through hole (5) is formed in the middle of the bottom end of the lower plate (2), and the diameter of the through hole (5) is larger than the diameter of the sensor (4).

3. The fixing device of a high-precision metal diaphragm sensor according to claim 1 is characterized in that: The limiting mechanism (6) comprises a rotating rod (601), one end of which is rotatably connected to the bottom of the lower plate (2), and the other end of which is threadedly connected to a bolt (602).

4. A fixing device for a high-precision metal diaphragm sensor according to claim 3, characterized in that: A top block (603) is fixedly connected to the top of the bolt (602), and a side groove (604) is provided on a side of the rotary rod (601) close to the base (7).

5. The fixing device of a high-precision metal diaphragm sensor according to claim 1 is characterized in that: A latch (8) is movably inserted on both sides of the base (7), one end of the latch (8) extends to the inside of the side groove (604), and the other end of the latch (8) extends to the outside of the base (7) and is fixedly connected to a handle (9).

6. A fixing device for a high-precision metal diaphragm sensor according to claim 5, characterized in that: The outer surface of the latch (8) is movably sleeved with a spring (10) located between the base (7) and the pull handle (9), and the two ends of the spring (10) are respectively fixedly connected to the outer surface of the base (7) and the pull handle (9).

7. The fixing device of a high-precision metal diaphragm sensor according to claim 1 is characterized in that: Notches (11) are provided on both sides of the bottom of the lower plate (2), and the depth of the notches (11) is greater than the thickness of the top block (603).

8. The fixing device of a high-precision metal diaphragm sensor according to claim 1 is characterized in that: The side of the fixing block (301) close to the sensor (4) is arc-shaped, and the fixing block (301) and the sensor (4) are in close contact.

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