CN209745394U - One-ten-thousandth precision electronic scale - Google Patents

Abstract

The utility model relates to a ten thousandth precision electronic scale, it includes the weighing platform, a pedestal, the sealed cowling, the pressure measurement device, air pressure adjusting device, air vent and controller, sealed cowling and base sealing connection are in order to form sealed cavity, the air vent is linked together with sealed cavity, the pressure measurement device encircles the periphery that sets up at the weighing platform, air pressure adjusting device is linked together with the air vent, the pressure measurement device is used for detecting the inside real-time atmospheric pressure value of sealed cavity, air pressure adjusting device is used for adjusting the inside atmospheric pressure value size of sealed cavity, the real-time atmospheric pressure value transmission that the pressure measurement device will detect gives the controller, the controller presets benchmark atmospheric pressure value and carries out the comparison with received real-time atmospheric pressure value, and go to control air pressure adjusting device work according to the comparison result, in order to take out gas or fill gas to sealed cavity from. The utility model discloses can be according to the inside atmospheric pressure value of measurement needs automatically regulated sealed cowling, have the more accurate advantage of measuring result.

Description

One-ten-thousandth precision electronic scale

Technical Field

the utility model belongs to the technical field of weighing device's technique and specifically relates to a ten thousandth precision electronic scale is related to.

Background

A ten-thousandth precision electronic scale (also called an electronic analytical balance) is a weighing apparatus used for accurately measuring mass (weight). The precision electronic scale is a comprehensive product developed by a sensing technology, an analog electronic technology, a digital electronic technology and a microprocessor technology, and has multiple functions of automatic calibration, automatic display, tare weight removal, automatic data output, automatic fault tracing, overload protection and the like. The precise electronic scale is an indispensable important instrument in quantitative analysis work and guarantees reliable analysis results. Because the precision of the precision electronic scale is very high, the weighing accuracy in the using process can be influenced by various factors such as temperature, humidity, air flow, air pressure and the like.

Now, a chinese utility model patent with publication number CN205981430U was retrieved, which discloses an electronic analytical balance, comprising: base, weighing plate, weighing sensor, liquid crystal display, windshield, treater and humidity testing arrangement, the device can test the humidity in the electron analytical balance to confirm whether inside humidity is dry, thereby avoid the moisture in easy damp article and the air to react.

The above prior art solutions have the following drawbacks: in some high-precision measurement, the most accurate measurement result can be obtained only under the environment of a specific air pressure value, and the influence of the internal air pressure symmetrical quantity result of the windshield is not considered in the current ten-thousandth precision electronic scale, so that the weighing result is not accurate enough.

SUMMERY OF THE UTILITY MODEL

the utility model aims at providing a ten-thousandth precision electronic scale can be according to the inside atmospheric pressure value of measurement needs automatically regulated sealed cowling, has the more accurate advantage of measuring result.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

A precision electronic scale of ten-thousandth, comprising: a weighing platform, a base and a sealing cover,

The sealing cover and the base are connected in a sealing mode to form a sealing cavity, and the ten-thousandth precision electronic scale is further provided with: the weighing platform is positioned in the middle of the base, the vent hole is communicated with the sealed chamber,

the air pressure detection device is arranged around the weighing platform, one end of the air pressure adjusting device is communicated with the vent hole, the air pressure detection device is used for detecting the real-time air pressure value in the sealed chamber, the air pressure adjusting device is used for adjusting the air pressure value in the sealed chamber,

The air pressure detection device and the air pressure adjusting device are electrically connected with the controller, the air pressure detection device transmits a detected real-time air pressure value to the controller, the controller presets a reference air pressure value to be compared with the received real-time air pressure value, and controls the air pressure adjusting device to work according to a comparison result so as to extract air from the sealed cavity or fill air into the sealed cavity.

By adopting the technical scheme, when the real-time air pressure value received by the controller is higher than the reference air pressure value preset by the controller, the controller can control the air pressure adjusting device to pump air out of the sealed chamber, so that the air pressure value in the sealed chamber is reduced, and the controller can control the air pressure adjusting device to stop working until the real-time air pressure value received by the controller is the same as the reference air pressure value preset by the controller; when the real-time air pressure value received by the controller is lower than the reference air pressure value preset by the controller, the controller controls the air pressure adjusting device to fill air into the sealed cavity, so that the air pressure value in the sealed cavity is increased, and the controller controls the air pressure adjusting device to stop working until the real-time air pressure value received by the controller is the same as the reference air pressure value preset by the controller; when the real-time air pressure value received by the controller is the same as the reference air pressure value preset by the controller, the controller controls the air pressure adjusting device to stop working; this precision electronic scale of ten thousandth can be according to the inside atmospheric pressure value of measuring needs automatically regulated windshield, has the more accurate advantage of measuring result, can be applicable to large-scale, high-end laboratory or other accurate detection demands and use.

The utility model discloses further set up to, the atmospheric pressure detection device includes: the weighing platform comprises a plurality of air pressure sensors and an annular mounting plate, wherein the weighing platform is positioned in the middle of the annular mounting plate, the air pressure sensors are uniformly arranged on the annular mounting plate at intervals, the air pressure sensors are electrically connected with the controller and transmit detected real-time air pressure values to the controller, and the controller obtains a plurality of real-time air pressure values and obtains the average value of the real-time air pressure values to compare with the reference air pressure value.

By adopting the technical scheme, a plurality of air pressure sensors can be used for detecting real-time air pressure values in different directions in the sealed cavity, when the detection result of a certain air pressure sensor or a plurality of air pressure sensors is not accurate enough, the controller can correct the detection result of the real-time air pressure values in the sealed cavity by taking a plurality of real-time air pressure values and taking the average value of the real-time air pressure values, and therefore the detection precision of the air pressure detection device can be greatly increased.

The utility model discloses further set up to, the atmospheric pressure adjusting device includes: step-down module and step-up module, the step-down module includes: outlet duct, first electron check valve and air are taken out and are left the machine, the module that steps up includes: the air pump comprises an air inlet pipe, a second electronic one-way valve and an air pump, wherein two air holes are formed in the air inlet pipe and are respectively communicated with the air outlet pipe and the air inlet pipe, and the first electronic one-way valve, the second electronic one-way valve, the air pumping machine and the air pump are electrically connected with the controller.

by adopting the technical scheme, when the controller needs to control the air pressure adjusting device to reduce the air pressure value in the sealed cavity, the controller can control the air pumping machine to work and open the first electronic one-way valve, and the air pumping machine pumps air from the inside of the sealed cavity through the air outlet pipe, so that the air pressure value in the sealed cavity is reduced to the reference air pressure value preset by the controller; when the controller needs to control the air pressure adjusting device to increase the air pressure value in the sealed cavity, the controller can control the air pump to work and open the second electronic one-way valve, the air pump conveys air to the inside of the sealed cavity through the air inlet pipe, and the air pressure value in the sealed cavity is increased to the reference air pressure value preset by the controller.

The utility model discloses further set up to, the atmospheric pressure adjusting device includes: the air inlet comprises a first branch pipe, a second branch pipe, an air conveying pipe, an electronic three-way valve, a vacuum generator and an air compressor, wherein two vent holes are arranged and are respectively communicated with the first branch pipe and the second branch pipe,

Three gas ports of the electronic three-way valve are respectively communicated with the first branch pipe, the second branch pipe and the gas pipe, the vacuum generator is arranged on the gas pipe, one end of the gas pipe, far away from the electronic three-way valve, is connected to the air compressor, and the electronic three-way valve, the vacuum generator and the air compressor are electrically connected with the controller.

By adopting the technical scheme, when the controller needs to control the air pressure adjusting device to reduce the air pressure value in the sealed cavity, the controller can control the air compressor to work and open the valve communicated with the electronic three-way valve and the first branch pipe, the air compressor and the vacuum generator are matched for use, and air can be pumped out of the sealed cavity through the air conveying pipe and the first branch pipe, so that the air pressure value in the sealed cavity is reduced to the reference air pressure value preset by the controller; when the controller needs to control the air pressure adjusting device to increase the air pressure value in the sealed cavity, the controller controls the air compressor to work and opens the valve communicated with the electronic three-way valve and the second branch pipe, and the air compressor fills air into the sealed cavity through the air conveying pipe and the second branch pipe, so that the air pressure value in the sealed cavity is increased to be the reference air pressure value preset by the controller.

the utility model discloses further set up to: the bottom end of one side of the sealing cover is hinged with the base, and the bottom end of the other side of the sealing cover is fixedly connected with the base through a locking device.

By adopting the technical scheme, the sealing cover can be opened or closed through rotation, and the locking between the sealing cover and the base can be realized through the locking device, so that the working personnel can conveniently take and place objects in the sealing cavity.

The utility model discloses further set up to, locking device includes: the sealing device comprises an upper plate, a lower plate and a sealing sleeve, wherein the upper plate is fixed on the outer side face of the bottom of the sealing cover, the lower plate is fixed on the side edge of the base, an upper groove is formed in the upper surface of the upper plate, a lower groove is formed in the lower surface of the lower plate, an upper convex block which is in plug-connection with the upper groove is arranged on one inner side wall of the sealing sleeve, and a lower convex block which is in plug-connection with the lower groove is arranged on the other inner side wall of the.

Through adopting above-mentioned technical scheme, go up the lug and can closely laminate with last groove, lower lug can closely laminate with lower groove to the seal cover just can be in the same place upper plate and lower plate close fitting, and then just can make sealed cowling and base locking fixed, makes sealed cavity's gas tightness better.

The utility model discloses further set up to, locking device includes: the sealing cover comprises a first plate, a second plate and bolt groups, wherein the first plate is fixedly connected to the outer side face of the bottom of the sealing cover, the second plate is fixed to the side edge of the base, through holes for the bolt groups to penetrate through are formed in the first plate and the second plate, the bolt groups are provided with multiple groups, and the first plate and the second plate are clamped and fixed through the bolt groups.

Through adopting above-mentioned technical scheme, can make first board and second board clamp fastening fix with bolt assembly, and then make sealed cowling and base locking fixed for the gas tightness of sealed cavity is better.

The utility model discloses further set up to: the upper surface of base is provided with the annular of two annular arrangements, and two annular are big one little, the inlay card has ring seal in the annular, ring seal's upper surface protrusion in the upper surface of base, ring seal's shape size just with the bottom face looks adaptation of sealed cowling, the sealed cowling is compressed tightly extrude when on the base ring seal.

through adopting above-mentioned technical scheme, ring packing can get up the upper surface seal of sealed cowling bottom and bottom plate, forms inseparable double-deck encapsulated situation, makes the gas tightness of sealed cavity better to increase the detection precision of atmospheric pressure detection device, and then make the weighing result of ten thousandth precision electronic scale more accurate.

To sum up, the utility model discloses a beneficial technological effect does:

1. The real-time air pressure value in the sealed cavity can be accurately detected and timely corrected to be a preset reference air pressure value, and the weighing precision of the ten-thousandth precision electronic scale is guaranteed;

2. The good sealing performance of the sealing cavity can be ensured, and the accuracy of correcting the air pressure value in the sealing cavity is ensured;

3. the ten-thousandth precision electronic scale is simple in structure, convenient to install and more accurate in weighing result.

Drawings

Fig. 1 is a schematic overall structure diagram of a first embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;

fig. 3 is a schematic overall structure diagram of a second embodiment of the present invention;

fig. 4 is a schematic overall structure diagram of a third embodiment of the present invention;

Fig. 5 is a partially enlarged schematic view of a portion B in fig. 4.

reference numerals: 1. a weighing platform; 2. a base; 3. an air pressure detecting device; 31. an annular mounting plate; 32. an air pressure sensor; 4. an air pressure adjusting device; 41. an air outlet pipe; 42. a first electronic check valve; 43. an air pump; 44. an air inlet pipe; 45. a second electronic check valve; 46. an air pump; 47. a first branch pipe; 48. a second branch pipe; 49. a gas delivery pipe; 410. an electronic three-way valve; 411. an air compressor; 412. a vacuum generator; 5. a controller; 6. a sealing cover; 61. a vent hole; 7. a locking device; 71. an upper plate; 72. a lower plate; 73. sealing sleeves; 731. an upper bump; 732. a lower bump; 74. a first plate; 75. a second plate; 76. a bolt group; 8. an annular seal ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example one

referring to fig. 1, for the utility model discloses a ten-thousandth precision electronic scale equipment, include: the weighing platform 1, the base 2, the air pressure detecting device 3, the air pressure adjusting device 4, the controller 5, the sealing cover 6 and the locking device 7, wherein the weighing platform 1 is located in the middle of the base 2, the sealing cover 6 is hermetically connected with the base 2 to form a sealed chamber, the side wall of the sealing cover 6 is provided with an air vent 61 (in other embodiments, the air vent 61 can also be arranged on the base 2 or on the top end of the sealing cover 6, but the air vent 61 is not arranged towards the weighing platform 1 as much as possible), the air vent 61 is communicated with the sealed chamber,

The air pressure detecting device 3 is arranged on the base 2 and arranged around the weighing platform 1 (in other embodiments, the air pressure detecting device 3 can also be arranged on the inner wall of the sealing cover 6), one end of the air pressure adjusting device 4 is communicated with the vent hole 61, the position where the air pressure adjusting device 4 is communicated with the vent hole 61 must have good sealing performance, the air pressure detecting device 3 is used for detecting the real-time air pressure value inside the sealed chamber, the air pressure adjusting device 4 is used for adjusting the air pressure value inside the sealed chamber, the air pressure detecting device 3 and the air pressure adjusting device 4 are both electrically connected with the controller 5, the air pressure detecting device 3 transmits the detected real-time air pressure value to the controller 5, the controller 5 presets a reference air pressure value to be compared with the received real-time air pressure value, and controls the air pressure adjusting device 4 to work according to the comparison result so as to pump out the air from the sealed chamber or fill the air into the sealed chamber.

the air pressure detection device 3 includes: a plurality of baroceptors 32 and annular mounting panel 31, weighing platform 1 is located annular mounting panel 31 in the middle of, a plurality of baroceptors 32 are even to be set up at the interval on annular mounting panel 31 (baroceptor 32's quantity can be according to the big or small self-adjustment of sealed cavity), baroceptor 32 accessible threaded connection, mode such as bonding or joint is installed on annular mounting panel 31, annular mounting panel 31 is fixed on base 2 through modes such as bonding or welding, a plurality of baroceptors 32 all with controller 5 electric connection, a plurality of baroceptors 32 transmit the real-time atmospheric pressure value that detects for controller 5, controller 5 takes a plurality of real-time atmospheric pressure values and takes its average value in order to compare with benchmark atmospheric pressure value. Therefore, a plurality of air pressure sensors 32 can be used for detecting real-time air pressure values in different directions in the sealed cavity, when the detection result of a certain air pressure sensor 32 or a plurality of air pressure sensors 32 is not accurate enough, the controller 5 can correct the detection result of the real-time air pressure values in the sealed cavity by taking a plurality of real-time air pressure values and taking the average value of the real-time air pressure values, and therefore the detection precision of the air pressure detection device 3 is greatly increased.

The air pressure adjusting device 4 includes: step-down module and step-up module, the step-down module includes: outlet duct 41, first electron check valve 42 and air are taken out and are left machine 43, and the boost module includes: the air inlet pipe 44, the second electronic one-way valve 45 and the air pump 46, the two air holes 61 are arranged and are respectively communicated with the air outlet pipe 41 and the air inlet pipe 44, the connection mode with the first electronic one-way valve 42, the second electronic one-way valve 45, the air pumping-out machine 43 and the air pump 46 can be self-sealing connection, threaded connection or flange connection and other connection modes, but the communication position must keep good sealing performance, and the first electronic one-way valve 42, the second electronic one-way valve 45, the air pumping-out machine 43 and the air pump 46 are all electrically connected with the controller 5.

When the controller 5 needs to control the air pressure adjusting device 4 to reduce the air pressure value in the sealed cavity, the controller 5 controls the air pumping-out machine 43 to work and open the first electronic one-way valve 42, and the air pumping-out machine 43 pumps out air from the sealed cavity through the air outlet pipe 41, so that the air pressure value in the sealed cavity is reduced to the reference air pressure value preset by the controller 5; when the controller 5 needs to control the air pressure adjusting device 4 to increase the air pressure value in the sealed chamber, the controller 5 controls the air pump 46 to work and open the second electronic one-way valve 45, and the air pump 46 delivers air to the inside of the sealed chamber through the air inlet pipe 44, so that the air pressure value in the sealed chamber is increased to the reference air pressure value preset by the controller 5.

One side bottom of sealed cowling 6 is articulated with base 2, and the opposite side bottom of sealed cowling 6 is connected fixedly through a locking device 7 with base 2, and wherein locking device 7 includes: the sealing cover comprises a first plate 74, a second plate 75 and bolt groups 76, wherein the first plate 74 is fixedly connected to the outer side face of the bottom of the sealing cover 6, the second plate 75 is fixed to the side edge of the base 2 in a welding, bonding or threaded manner, through holes for the bolt groups 76 to pass through are formed in the first plate 74 and the second plate 75, the bolt groups 76 are provided with multiple groups (the number and the positions of the bolt groups 76 are determined according to the sizes of the first plate 74 and the second plate 75), and the first plate 74 and the second plate 75 are fixed through the bolt groups 76. Therefore, the sealing cover 6 can be opened or closed through rotation, so that the staff can conveniently take and place articles in the sealing cavity, and the sealing cover 6 and the base 2 can be locked through the locking device 7, so that the air tightness of the sealing cavity is better.

Referring to fig. 1 and 2, the upper surface of the base 2 is provided with two annular grooves arranged in an annular manner, the two annular grooves are one large and one small, an annular sealing ring 8 is embedded in each annular groove, the upper surface of the annular sealing ring 8 protrudes out of the upper surface of the base 2, the annular sealing ring 8 is just matched with the bottom end surface of the sealing cover 6 in shape and size, the annular sealing ring 8 is extruded when the sealing cover 6 is pressed on the base 2, and the cross section of the annular sealing ring 8 is circular (in other embodiments, the cross section can also be isosceles trapezoid, rectangle, and the like). Thus, the annular sealing ring 8 can seal the bottom end of the sealing cover 6 and the upper surface of the bottom plate to form a tight double-layer sealing state, so that the air tightness of the sealing cavity is better, the detection precision of the air pressure detection device 3 is increased, and the weighing result of the ten-thousandth precision electronic scale is more accurate.

The implementation principle of the above embodiment is as follows: after the sealing cover 6 and the base 2 are connected in a sealing mode to form a sealing cavity with good sealing performance, the air pressure detection device 3 starts to detect real-time air pressure in the sealing cavity, then the air pressure detection device 3 transmits a detection result to the controller 5, a reference air pressure value is preset in the controller 5, when the real-time air pressure value received by the controller 5 is higher than the reference air pressure value preset by the controller 5, the controller 5 controls the air pressure adjusting device 4 to extract air from the sealing cavity, so that the air pressure value in the sealing cavity is reduced, and the controller 5 controls the air pressure adjusting device 4 to stop working until the real-time air pressure value received by the controller 5 is the same as the reference air pressure value preset by the controller 5; when the real-time air pressure value received by the controller 5 is lower than the reference air pressure value preset by the controller 5, the controller 5 controls the air pressure adjusting device 4 to fill air into the sealed chamber, so that the air pressure value in the sealed chamber is increased, and the controller 5 controls the air pressure adjusting device 4 to stop working until the real-time air pressure value received by the controller 5 is the same as the reference air pressure value preset by the controller 5; when the real-time air pressure value received by the controller 5 is the same as the reference air pressure value preset by the controller 5, the controller 5 controls the air pressure adjusting device 4 to stop working; this precision electronic scale of ten thousandth can be according to the inside atmospheric pressure value of measuring needs automatically regulated windshield, has the more accurate advantage of measuring result, can be applicable to large-scale, high-end laboratory or other accurate detection demands and use.

Example two

Referring to fig. 3, a ten-thousandth precision electronic scale apparatus is different from the first embodiment in that an air pressure adjusting device 4 includes: the air pipe system comprises a first branch pipe 47, a second branch pipe 48, an air pipe 49, an electronic three-way valve 410, a vacuum generator 412 and an air compressor 411, two vent holes 61 are arranged and are respectively communicated with the first branch pipe 47 and the second branch pipe 48, three air ports of the electronic three-way valve 410 are respectively communicated with the first branch pipe 47, the second branch pipe 48 and the air pipe 49, the communicated positions all need to have good sealing performance, the vacuum generator 412 is arranged on the air pipe 49, one end, far away from the electronic three-way valve 410, of the air pipe 49 is connected to the air compressor 411 in a self-sealing connection mode, a threaded connection mode or a flange connection mode and the like, but the connection position needs to keep good sealing performance, and the electronic three-way valve 410, the vacuum generator 412 and the air compressor 411 are all electrically connected with a controller 5.

When the controller 5 needs to control the air pressure adjusting device 4 to reduce the air pressure value in the sealed cavity, the controller 5 will control the air compressor 411 to work and open the valve of the electronic three-way valve 410 communicated with the first branch pipe 47, the air compressor 411 and the vacuum generator 412 are used in cooperation, air can be pumped out from the sealed cavity through the air pipe 49 and the first branch pipe 47, and the air pressure value in the sealed cavity is reduced to the reference air pressure value preset by the controller 5; when the controller 5 needs to control the air pressure adjusting device 4 to increase the air pressure value in the sealed chamber, the controller 5 controls the air compressor 411 to operate and open the valve of the electronic three-way valve 410, which is communicated with the second branch pipe 48, so that the air compressor 411 fills air into the sealed chamber through the air pipe 49 and the second branch pipe 48, and the air pressure value in the sealed chamber is increased to be the reference air pressure value preset by the controller 5.

EXAMPLE III

Referring to fig. 4 and 5, a ten-thousandth precision electronic scale apparatus differs from the first embodiment in that a locking device 7 includes: the upper plate 71, the lower plate 72 and the sealing sleeve 73, the upper plate 71 is fixed on the outer side face of the bottom of the sealing cover 6, the lower plate 72 is fixed on the side edge of the base 2, the fixing mode can be welding, bonding and the like, the upper surface of the upper plate 71 is provided with an upper groove, the lower surface of the lower plate 72 is provided with a lower groove, the cross section shapes of the upper groove and the lower groove can be rectangles in the figure, and can also be isosceles trapezoid and in a shape like a Chinese character '8', one inner side wall of the sealing sleeve 73 is provided with an upper convex block 731 which is spliced with the upper groove, and the other inner side wall of the sealing sleeve 73 is.

The upper projection 731 and the upper groove can be tightly attached, and the lower projection 732 and the lower groove can be tightly attached, so that the sealing sleeve 73 can tightly attach the upper plate 71 and the lower plate 72 together, and further the sealing cover 6 and the base 2 can be locked and fixed, and the air tightness of the sealing chamber is better.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. a precision electronic scale of ten-thousandth, comprising: weighing platform (1), base (2) and sealed cowling (6), its characterized in that:

The sealing cover (6) is connected with the base (2) in a sealing mode to form a sealing cavity, and the ten-thousandth precision electronic scale is further provided with: the air pressure measuring device (3), the air pressure adjusting device (4), the vent hole (61) and the controller (5), the weighing platform (1) is positioned in the middle of the base (2), the vent hole (61) is communicated with the sealed chamber,

The air pressure detection device (3) is arranged around the weighing platform (1), one end of the air pressure adjusting device (4) is communicated with the vent hole (61), the air pressure detection device (3) is used for detecting a real-time air pressure value in the sealed chamber, the air pressure adjusting device (4) is used for adjusting the air pressure value in the sealed chamber,

The air pressure detection device (3) and the air pressure adjusting device (4) are electrically connected with the controller (5), the air pressure detection device (3) transmits a detected real-time air pressure value to the controller (5), the controller (5) presets a reference air pressure value to be compared with the received real-time air pressure value, and controls the air pressure adjusting device (4) to work according to a comparison result so as to draw out air from the sealed cavity or fill air into the sealed cavity.

2. A precision electronic scale according to claim 1, characterized in that:

the air pressure detection device (3) comprises: a plurality of baroceptors (32) and annular mounting panel (31), weighing platform (1) is located in the middle of annular mounting panel (31), and is a plurality of baroceptor (32) even interval sets up on annular mounting panel (31), and is a plurality of baroceptor (32) all with controller (5) electric connection, it is a plurality of baroceptor (32) transmit the real-time atmospheric pressure value that detects for controller (5), controller (5) get a plurality of real-time atmospheric pressure values and get its average value in order with the comparison of benchmark atmospheric pressure value.

3. A precision electronic scale according to claim 1, characterized in that:

the air pressure adjusting device (4) comprises: step-down module and step-up module, the step-down module includes: outlet duct (41), first electron check valve (42) and air extractor (43), the boost module includes: intake pipe (44), second electron check valve (45) and air pump (46), air vent (61) be provided with two and respectively with outlet duct (41) air intake pipe (44) are linked together, first electron check valve (42), second electron check valve (45) air pump (43) and air pump (46) all with controller (5) electric connection.

4. A precision electronic scale according to claim 1, characterized in that:

the air pressure adjusting device (4) comprises: a first branch pipe (47), a second branch pipe (48), a gas conveying pipe (49), an electronic three-way valve (410), a vacuum generator (412) and an air compressor (411), wherein two vent holes (61) are arranged and are respectively communicated with the first branch pipe (47) and the second branch pipe (48),

Three gas ports of electron three-way valve (410) respectively with first branch pipe (47), second branch pipe (48) air-supply pipe (49) are linked together, vacuum generator (412) are located on air-supply pipe (49), air-supply pipe (49) are kept away from the one end of electron three-way valve (410) is connected on air compressor (411), electron three-way valve (410) vacuum generator (412) air compressor (411) all with controller (5) electric connection.

5. A precision electronic scale according to claim 1, characterized in that:

the bottom end of one side of the sealing cover (6) is hinged to the base (2), and the bottom end of the other side of the sealing cover (6) is fixedly connected with the base (2) through a locking device (7).

6. An electronic precision ten-thousandth scale according to claim 5, characterized in that:

the locking device (7) comprises: the sealing device comprises an upper plate (71), a lower plate (72) and a sealing sleeve (73), wherein the upper plate (71) is fixed on the outer side face of the bottom of the sealing cover (6), the lower plate (72) is fixed on the side edge of the base (2), an upper groove is formed in the upper surface of the upper plate (71), a lower groove is formed in the lower surface of the lower plate (72), an upper convex block (731) which is spliced with the upper groove is arranged on one inner side wall of the sealing sleeve (73), and a lower convex block (732) which is spliced with the lower groove is arranged on the other inner side wall of the sealing sleeve (73).

7. an electronic precision ten-thousandth scale according to claim 5, characterized in that:

the locking device (7) comprises: the sealing cover comprises a first plate (74), a second plate (75) and bolt groups (76), wherein the first plate (74) is fixedly connected to the outer side face of the bottom of the sealing cover (6), the second plate (75) is fixed to the side edge of the base (2), through holes for the bolt groups (76) to penetrate through are formed in the first plate (74) and the second plate (75), multiple groups of bolt groups (76) are arranged, and the first plate (74) and the second plate (75) are clamped and fixed through the bolt groups (76).

8. a precision electronic scale according to claim 1, characterized in that:

the upper surface of base (2) is provided with the annular that two annulars were arranged, and two annular are big one by one little, the inlay card has ring seal (8) in the annular, the upper surface protrusion of ring seal (8) in the upper surface of base (2), the shape size of ring seal (8) just with the bottom face looks adaptation of sealed cowling (6), sealed cowling (6) are compressed tightly extrude when base (2) is last ring seal (8).