CN212158813U

CN212158813U - Integrated high-precision weighing module

Info

Publication number: CN212158813U
Application number: CN202020768234.1U
Authority: CN
Inventors: 黄丹丹; 李响; 张萍; 蔡金杰
Original assignee: Mettler Toledo Changzhou Measurement Technology Ltd; Mettler Toledo International Trading Shanghai Co Ltd; Mettler Toledo Changzhou Precision Instruments Ltd
Current assignee: Mettler Toledo Changzhou Measurement Technology Ltd; Mettler Toledo International Trading Shanghai Co Ltd; Mettler Toledo Changzhou Precision Instruments Ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-12-15
Anticipated expiration: 2030-05-11

Abstract

The utility model provides an integrated high-precision weighing module, which comprises a shell, an electromagnetic force sensor, a PCB (printed circuit board), a scale assembly, a support ring and a wind-shield ring, wherein the electromagnetic force sensor and the PCB are arranged in the shell, and a bearing head of the electromagnetic force sensor is upwards penetrated out from the upper end part of the shell; the support ring is sleeved on the bearing head, the scale pan assembly is arranged on the bearing head, so that the support ring is positioned between the scale pan assembly and the shell, and the wind shielding ring is arranged around the scale pan assembly and positioned on the support ring; a first air flow passage is formed among the shell, the supporting ring and the wind blocking ring, and at least part of air flow in the shell flows out from the first air flow passage to the outside. The utility model discloses an electronic unit is built-in, and when the customer field installation that can significantly reduce, need external electric box, the loaded down with trivial details of restriction and cable in the space that brings to the heat transfer of the reduction electron device that can show, temperature gradient around the sensor will significantly reduce, thereby has guaranteed measurement performance.

Description

Integrated high-precision weighing module

Technical Field

The utility model relates to a high accuracy industrial weighing device field, in particular to integrated form high accuracy weighing module.

Background

In the field of high-precision industrial weighing devices, high-precision modules are particularly sensitive to the influence of the environment, such as the temperature, humidity and heat convection in air, air pressure and the like of the environment, which all affect the weighing precision, so that electronic units are externally arranged on the market for the high-precision modules, so that the heat conduction and electromagnetic interference are reduced, the number of parts is large, and the installation is complicated and the like in inconvenient places.

In the prior art, for a high-precision module, there is mainly one of the following problems:

firstly, the problem of temperature gradient exists, the largest source of heat in the whole module is a circuit board, and the circuit board is externally arranged in an independent electrical box in the current market so as to prevent heat from being conducted and radiated to a sensor. The structure leads to the problems of complicated structure, large number of parts and the like.

Secondly, heat exchange inside and outside the housing is also a key technical difficulty, and the influence of heat convection on the high-precision module is also large. When the module is powered on, the electronic device and the sensor generate heat, certain air flow is generated in the module cavity, air needs to be diffused into the air through the holes at the moment, balance in the module cavity is achieved, and the diffusion process can disturb the scale.

In view of the above, those skilled in the art will improve the structure of the high-precision weighing module in order to overcome the above technical problems.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that the structure in order to overcome prior art high accuracy weighing module is loaded down with trivial details, and defect such as thermal convection influences greatly provides an integrated form high accuracy weighing module.

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

an integrated high-precision weighing module is characterized by comprising a shell, an electromagnetic force sensor, a PCB (printed circuit board), a scale pan assembly, a support ring and a wind-shielding ring, wherein the electromagnetic force sensor and the PCB are arranged in the shell, and a bearing head of the electromagnetic force sensor penetrates out of the upper end of the shell;

the scale pan assembly is arranged on the bearing head, so that the support ring is positioned between the scale pan assembly and the shell, and the wind shielding ring is arranged around the scale pan assembly and positioned on the support ring;

a first air flow passage is formed among the shell, the support ring and the wind-shield ring, and when the integrated high-precision weighing module is electrified, at least part of air flow in the shell flows out of the first air flow passage to the outside.

According to the utility model discloses an embodiment, the scale dish subassembly includes scale dish and scale dish support, scale dish support mounting is in bear overhead, the scale dish is installed on the scale dish support.

According to an embodiment of the present invention, the housing includes a bottom plate and a housing, the electromagnetic force sensor and the PCB are mounted on the bottom plate, and the housing is covered outside the electromagnetic force sensor and the PCB and connected to the bottom plate;

the upper end surface of the housing is provided with a through hole, and the bearing head penetrates out of the through hole.

According to an embodiment of the present invention, the support ring comprises an installation portion and a support plate, the installation portion is disposed on the support plate, and the support ring is sleeved on the carrier head through the installation portion and is in clearance fit with the carrier head;

a plurality of air channel holes are formed in the supporting plate, the air channel holes are surrounded on the periphery of the mounting part, a circle of protrusions extending upwards are arranged on the periphery of the air channel holes, a flow channel is formed between each protrusion and the mounting part, and the air channel holes are communicated with the through holes;

the lower part of the wind-shield ring and the upper part of the support ring are in clearance fit to form a first clearance channel, and the first air flow channel is formed by communicating the flow channel with the first clearance channel.

According to an embodiment of the present invention, the airway hole is a kidney-shaped hole.

According to the utility model discloses an embodiment, the installation department includes first installation department and second installation department, first installation department is followed the backup pad upwards extends, the second installation department is followed the backup pad downwardly extending, first installation department is located the housing is outside, the second installation department is located inside the housing, just the outside diameter of first installation department is greater than the outside diameter of second installation department.

According to an embodiment of the invention, a second clearance channel is formed between the mounting portion and the carrier head;

the wind-shielding ring is sleeved on the first installation part, a third gap channel is formed between the wind-shielding ring and the scale assembly, and the second gap channel is communicated with the third gap channel to form a second airflow channel.

According to an embodiment of the invention, the wind deflector comprises two concentric outer and inner cylindrical rings, the inner cylindrical ring with connect through a ring plate between the outer cylindrical ring, make the inner cylindrical ring with form an upper cavity and a lower cavity between the outer cylindrical ring, the first clearance passageway is located in the lower cavity.

According to an embodiment of the invention, the outer end of the scale pan is at least partially located within the upper cavity.

According to the utility model discloses an embodiment, seted up a plurality of anti-overflow on the outer cylinder ring and glued the hole, the anti-overflow is glued the hole and is located lower part cavity part department.

According to the utility model discloses an embodiment, be provided with a heat insulating board on the bottom plate, the heat insulating board will the electromagnetic force sensor with the PCB board is kept apart to be located two independent spaces.

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

the utility model discloses integrated form high accuracy weighing module the utility model discloses a embed the electronic unit, a novel compact design, through electromagnetic force compensation technique and reach the weighing performance of high accuracy, make things convenient for customer's installation and maintenance. The structure realizes the built-in electronic unit, can greatly reduce the space limitation and the cable complexity caused by the need of an external electric box when a client installs on site, and can ensure the metering performance with the precision of 0.01 mg. The appearance structure is compact, the device is suitable for most of extremely challenging application environments, and the required space is small.

Meanwhile, the integrated high-precision weighing module isolates the electronic device and the key component sensor into two independent spaces through a heat insulation plate, the heat insulation plate is made of conductive POM, and the thermal resistance coefficient is large. Therefore, heat transfer of electronic devices can be remarkably reduced, and temperature gradient around the sensor can be greatly reduced, so that the metering performance is ensured.

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 the utility model discloses integrated form high accuracy weighing module's schematic structure diagram.

Fig. 2 is an enlarged schematic view of a portion E in fig. 1.

Fig. 3 is the utility model discloses integrated form high accuracy weighing module removes the stereogram behind the housing.

Fig. 4 is the utility model discloses the structural schematic diagram of support ring in the integrated form high accuracy weighing module is one.

Fig. 5 is the structure schematic diagram of the support ring in the integrated high-precision weighing module of the utility model II.

Fig. 6 is the utility model discloses the structural schematic diagram of the ring that keeps out the wind among the integrated form high accuracy weighing module is one.

Fig. 7 is the utility model discloses the structural schematic diagram of the ring that keeps out the wind among the integrated form high accuracy weighing module is two.

[ reference numerals ]

Housing 10

Electromagnetic force sensor 20

PCB board 30

Scale pan assembly 40

Support ring 50

Wind-guard ring 60

Carrier head 21

The first air flow passage A

Scale pan 41

Scale pan support 42

Base plate 11

Housing 12

Through-hole 121

Mounting part 51

Support plate 52

Airway holes 53

Projection 54

First clearance channel b

The first air flow passage A

Flow passage a

First mounting portion 511

Second mounting part 512

Second clearance channel c

Third clearance channel d

Second air flow channel B

Outer cylindrical ring 61

Inner cylindrical ring 62

Circular ring plate 63

Upper cavity 64

Lower cavity 65

Glue overflow prevention hole 611

Heat shield 70

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

Fig. 1 is the utility model discloses integrated form high accuracy weighing module's schematic structure diagram. Fig. 2 is an enlarged schematic view of a portion E in fig. 1. Fig. 3 is the utility model discloses integrated form high accuracy weighing module removes the stereogram behind the housing.

As shown in fig. 1 to 3, the integrated high-precision weighing module is a high-precision module with a built-in electronic unit, the maximum load is 200g, and the precision reaches 0.01 mg. Similar this kind of high accuracy sensor and module, temperature gradient and thermal convection, thermal radiation symmetrical weight precision influence is bigger, so will reduce the temperature gradient around the sensor, quick heat exchange is the utility model discloses a key.

The utility model discloses an integrated form high accuracy weighing module, it includes casing 10, electromagnetic force sensor 20, PCB board 30, scale dish subassembly 40, support ring 50 and wind-break ring 60, installs electromagnetic force sensor 20 and PCB board 30 in casing 10, and electromagnetic force sensor 20's carrier head 21 upwards wears out by the upper end of casing 10. The support ring 50 is sleeved on the bearing head 21, the scale pan assembly 40 is installed on the bearing head 21, so that the support ring 50 is located between the scale pan assembly 40 and the housing 10, and the wind-blocking ring 60 is arranged around the scale pan assembly 40 and located on the support ring 50. A first air flow passage a is formed between the housing 10, the support ring 50 and the wind blocking ring 60, and when the integrated high-precision weighing module is powered on, at least a part of the air flow in the housing 10 flows out to the outside.

Preferably, the scale assembly 40 comprises a scale 41 and a scale holder 42, the scale holder 42 being mounted on the carrier head 21, the scale 41 being mounted on the scale holder 42.

Here, the case 10 preferably includes a base plate 11 and a cover 12, the electromagnetic force sensor 20 and the PCB board 30 are mounted on the base plate 11, and the cover 12 is covered outside the electromagnetic force sensor 20 and the PCB board 30 and connected to the base plate 11. Both the housing 12 and the base plate 11 are preferably made of stainless steel. Meanwhile, a through hole 121 is formed on the upper end surface of the housing 12, and the carrier head 21 is passed through the through hole 121.

Fig. 4 is the utility model discloses the structural schematic diagram of support ring in the integrated form high accuracy weighing module is one. Fig. 5 is the structure schematic diagram of the support ring in the integrated high-precision weighing module of the utility model II. Fig. 6 is the utility model discloses the structural schematic diagram of the ring that keeps out the wind among the integrated form high accuracy weighing module is one. Fig. 7 is the utility model discloses the structural schematic diagram of the ring that keeps out the wind among the integrated form high accuracy weighing module is two.

As shown in fig. 4 to 7, in the embodiment of the present invention, the support ring 50 includes an installation portion 51 and a support plate 52, the installation portion 51 is disposed on the support plate 52, and the support ring 50 is sleeved on the carrier head 21 through the installation portion 51, and is in clearance fit with the carrier head 21. A plurality of air passage holes 53 are formed in the support plate 52, the air passage holes 53 surround the periphery of the mounting portion 51, a circle of protrusions 54 extending upwards is arranged on the periphery of the air passage holes 53, so that a flow passage a is formed between the protrusions 54 and the mounting portion 51, and the air passage holes 53 are communicated with the through holes 121. The lower part of the wind blocking ring 60 is in clearance fit with the upper part of the support ring 50 to form a first clearance channel b, and the first air flow channel A is formed by communicating the flow channel a with the first clearance channel b. The airway holes 53 are preferably kidney-shaped holes here.

Preferably, the mounting part 51 includes a first mounting part 511 and a second mounting part 512, the first mounting part 511 extends upward along the support plate 52, the second mounting part 512 extends downward along the support plate 52, the first mounting part 511 is located outside the housing 12, the second mounting part 512 is located inside the housing 12, and an outer diameter of the first mounting part 511 is greater than an outer diameter of the second mounting part 512.

Furthermore, a second gap channel c is formed between the mounting portion 51 and the carrier head 21, the wind-blocking ring 60 is sleeved on the first mounting portion 511, a third gap channel d is formed between the wind-blocking ring 60 and the scale assembly 40, and the second gap channel c is communicated with the third gap channel d to form a second air flow channel B.

Further, the wind deflector ring 60 preferably comprises two concentric outer and inner cylindrical rings 61, 62, connected by a ring plate 63 between the inner and outer cylindrical rings 62, 61 such that an upper cavity 64 and a lower cavity 65 are formed between the inner and outer cylindrical rings 62, 61, the first gap channel b being located in the lower cavity 65. The outer end of the scale platform 41 is at least partially located within the upper cavity 64.

In addition, a plurality of glue overflow preventing holes 611 are further formed in the outer cylindrical ring 61, and the glue overflow preventing holes 611 are located in the lower cavity 65.

Furthermore, the centralized high-precision weighing module of the present invention is characterized in that a heat insulation board 70 is further disposed on the bottom plate 11, and the electromagnetic force sensor 20 and the PCB 30 are isolated by the heat insulation board 70 to be located in two independent spaces.

Specifically, in the present embodiment, it is preferable that the electromagnetic force sensor 20 is mounted on the base plate 11, and then the PCB board 30 is mounted to the heat insulation board 70, and the electronic device and the key component sensor are separated into two independent spaces by the heat insulation board 70. The material of the thermal insulation board 70 is preferably conductive POM (polyoxymethylene), the thermal resistance coefficient is large, the heat transfer of electronic devices can be obviously reduced, the temperature gradient around the sensor can be greatly reduced, and therefore the metering performance is guaranteed.

According to the above structure description, in conjunction with fig. 2, arrow P1 indicates that when the module is powered on, the electronic device and the sensor generate heat, which causes a certain air flow in the cavity of the module, and a large amount of heat is exchanged with the outside along arrow P1 through the waist hole of the support ring shown in fig. 2, so that a small portion of heat is exchanged with the outside from arrow P2, and the interference of the air flow on the scale pan is reduced.

In further detail, for a high-precision module, the problem of temperature gradient is firstly solved, the largest source of heat of the whole module is a circuit board, and the circuit board is externally arranged in an independent electrical box in the current market product so as to prevent heat from being conducted and radiated to a sensor. Consequently the utility model discloses centralized high accuracy weighing module has introduced electric conductivity POM (being the heat insulating board), cuts off between circuit board and the sensor, POM's material attribute, and coefficient of heat conductivity is little, can effectual heat conduction that blocks the circuit board around the sensor to reduced the temperature gradient around the sensor, electric conductivity POM can also effectual anti-electromagnetic interference. The housing and the base plate are preferably made of stainless steel, which reduces the heat exchange between the external environment and the sensor. And simultaneously, the flatness of the bottom of the sensor is ensured.

Secondly, the heat exchange inside and outside the housing is also critical, the utility model discloses centralized high accuracy weighing module has designed labyrinth type scale structure, lets the heat in the housing can carry out the heat exchange with the air of outside, can not directly influence the scale simultaneously again, if the direct subtend scale of air flow, can influence the precision of weighing.

In addition, reduce the temperature gradient around the sensor, quick heat exchange also does the utility model discloses centralized high accuracy weighing module's key. The centralized high-precision weighing module places the electronic unit and the sensor in the same housing, and reduces the temperature gradient through the design of the middle heat insulation plate, so that the centralized high-precision weighing module is not influenced by the temperature during metering. Of course, the above heat insulation panels are merely examples for illustrating the present invention, and there are many similar variations and alternatives of materials and forms similar to such heat insulation panels. Therefore, as long as the method of heat insulation is proposed in the aspect of solving the core problems of the present invention, the use of similar materials or structural modifications should be within the scope of protection of the present application.

In addition, the influence of thermal convection on the high-precision module is also very big, and when the module is electrified, electronic device and sensor can produce the heat, lead to certain air current to produce in the module chamber, at this moment need give off the air through the hole in to the air, let the module intracavity reach the equilibrium, however this process of giving off can cause the disturbance to the balance dish. Therefore, the utility model discloses a plurality of gas passage holes have been seted up to the support ring among the centralized high accuracy weighing module, for example waist type hole lets a large amount of air flow from waist hole, direct and the exchange of external air, and not direct flow to the scale, reduces the interference to the scale. Only a small part of the hot air flows from the gap between the bearing head and the wind-shield ring, so that the influence of the hot air flow on the scale is obviously reduced.

To sum up, the utility model discloses integrated form high accuracy weighing module the utility model discloses a embed the electronic unit, a novel compact design, through electromagnetic force compensation technique and reach the weighing performance of high accuracy, make things convenient for customer's installation and maintenance. The structure realizes the built-in electronic unit, can greatly reduce the space limitation and the cable complexity caused by the need of an external electric box when a client installs on site, and can ensure the metering performance with the precision of 0.01 mg. The appearance structure is compact, the device is suitable for most of extremely challenging application environments, and the required space is small.

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 scope of the invention, and these changes and modifications are all within the scope of the invention.

Claims

1. The integrated high-precision weighing module is characterized by comprising a shell, an electromagnetic force sensor, a PCB (printed Circuit Board), a scale pan assembly, a support ring and a wind-shield ring, wherein the electromagnetic force sensor and the PCB are arranged in the shell, and a bearing head of the electromagnetic force sensor penetrates out of the upper end part of the shell;

2. The integrated, high-precision weighing module according to claim 1 wherein said scale assembly comprises a scale pan and a scale pan support, said scale pan support being mounted on said load head, said scale pan being mounted on said scale pan support.

3. The integrated high-precision weighing module according to claim 2, wherein said housing includes a base plate on which said electromagnetic force sensor and said PCB are mounted, and a cover case that covers the outside of said electromagnetic force sensor and said PCB and is connected to said base plate;

4. The integrated high-precision weighing module of claim 3, wherein the support ring comprises a mounting portion and a support plate, the mounting portion is disposed on the support plate, the support ring is sleeved on the carrier head through the mounting portion and is in clearance fit with the carrier head;

5. The integrated high-precision weighing module of claim 4, wherein said airway hole is a kidney-shaped hole.

6. The integrated high-precision weighing module of claim 4, wherein said mounting portion comprises a first mounting portion and a second mounting portion, said first mounting portion extending upwardly along said support plate, said second mounting portion extending downwardly along said support plate, said first mounting portion being located outside said housing, said second mounting portion being located inside said housing, and an outer diameter of said first mounting portion being greater than an outer diameter of said second mounting portion.

7. The integrated high-precision weighing module of claim 6, wherein a second clearance channel is formed between said mounting portion and said carrier head;

8. The integrated high precision weighing module of claim 7 wherein said wind-break ring comprises two concentric outer and inner cylindrical rings connected by a ring plate such that an upper and lower cavity is formed between said inner and outer cylindrical rings, said first gap channel being located in said lower cavity.

9. The integrated high precision weighing module of claim 8 wherein the outer end of said scale pan is at least partially located within said upper cavity.

10. The integrated high-precision weighing module of claim 8, wherein said outer cylindrical ring has a plurality of glue overflow preventing holes formed therein, said glue overflow preventing holes being located at said lower cavity portion.

11. The integrated high-precision weighing module according to claim 3, wherein said base plate is provided with a heat insulating plate, said heat insulating plate isolating said electromagnetic force sensor and said PCB plate to be located in two separate spaces.