CN214894651U - Vacuum drying weighing device - Google Patents
Vacuum drying weighing device Download PDFInfo
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- CN214894651U CN214894651U CN202120887087.4U CN202120887087U CN214894651U CN 214894651 U CN214894651 U CN 214894651U CN 202120887087 U CN202120887087 U CN 202120887087U CN 214894651 U CN214894651 U CN 214894651U
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- weighing
- vacuum drying
- sliding table
- tray
- limiting baffle
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Abstract
A vacuum drying weighing device comprises a stepping motor, wherein an extension shaft at the lower end of the stepping motor penetrates through a mechanical sealing element to be connected with the upper end of a coupler, and the lower end of the coupler is connected with a transmission shaft section at the middle upper part of a screw rod; a linear stroke assembly bottom plate is fixed on the inner wall of a vacuum drying box body on the side face, an upper limiting baffle plate of a sliding table is arranged at the middle upper part of the linear stroke assembly bottom plate, a lower limiting baffle plate of the sliding table is arranged at the bottom of the linear stroke assembly bottom plate, and bearings are arranged in the middle positions of the inner parts of the upper limiting baffle plate of the sliding table and the lower limiting baffle plate of the sliding table; a movable sliding table is arranged on the linear guide rail, a rigid cantilever beam arm is fixed on the front end face of the movable sliding table, a weighing sensor is fastened at the bottom of the other end of the rigid cantilever beam arm, and the weighing sensor is used for weighing a weighing tray; the utility model discloses can not influence in aspects such as additional part, long-term running by automatic weighing precision and resolution ratio, it is high to have the precision of weighing especially finished moisture content detection precision, characteristics that the leakproofness is good.
Description
Technical Field
The utility model relates to a dry processing technology field of agricultural product, concretely relates to vacuum drying weighing device.
Background
At present, the automatic weighing and moisture content detecting system applied to conduction type vacuum drying is mainly of a long-term bearing lifting type or a long-term tension lifting type, namely, the automatic weighing system comprises necessary weighing sensors and material trays for bearing materials, and also comprises additional parts such as contact type heat transfer heating plates, bearing/lifting devices, heat insulation devices and the like. In these systems, when the weighing system is not loaded with material, the weighing sensor still needs to bear the mass of the additional part, and the following problems exist:
on one hand, compared with materials, the mass of additional parts such as contact heat transfer heating plates is often too large, the effective range of the weighing system subtracts the mass of the additional parts from the range of the weighing sensor, and the mass of the additional parts of some systems approaches to or even exceeds 60% of the range of the weighing sensor, so that the effective range of the weighing system is greatly reduced.
On the other hand, the weighing sensors in the two weighing systems are stressed and deformed for a long time, so that the long-term running precision of the system is influenced.
In the third aspect, the final water content is a key index affecting the storage and quality of the dried product. A large amount of water is removed from the materials in the whole drying process, the dehydration quality even exceeds 85% of the initial total mass, and the mass of the materials is greatly reduced in the later drying period, so that the weight is lighter. If the resolution ratio and the precision of the automatic weighing system are rough, the automatic weighing result in the later drying period slightly deviates, so that the final water content detection result of the product has larger error, and even the storage period of the product has quality problems such as mildew and the like. Therefore, the resolution and precision of the automatic weighing system in long-term operation are particularly important for detecting the final water content of the dry product. The resolution of the weighing system is mainly affected by the measuring range of the weighing sensor, generally, the larger the measuring range is, the worse the absolute resolution is, when the additional mass of the weighing system is larger, the weighing sensor with the larger measuring range must be selected, so that the absolute resolution of the whole weighing system is reduced, and the detection accuracy of the water content of the product is affected.
SUMMERY OF THE UTILITY MODEL
In order to overcome the technical problem, the utility model aims to provide a vacuum drying weighing device makes automatic weighing precision and resolution ratio not receive aspects influences such as additional part, long-term operation, has and weighs the precision and has especially ended moisture content and detect the precision height, characteristics such as the leakproofness is good.
In order to realize the purpose, the utility model discloses a technical scheme is:
a vacuum drying weighing device comprises a linear stroke assembly, wherein the linear stroke assembly comprises a stepping motor 1, a mechanical sealing element 2, a coupler 3, a linear stroke assembly bottom plate 4, a sliding table upper limiting baffle 22, a linear guide rail 6, a screw rod 5, a movable sliding table 7, a sliding table lower limiting baffle 23 and a bearing 24;
an extension shaft at the lower end of the stepping motor 1 penetrates through the mechanical sealing element 2 to be connected with the upper end of a coupler 3, and the lower end of the coupler 3 is connected with a transmission shaft section at the middle upper part of the screw rod 5;
the linear stroke assembly bottom plate 4 is fixed on the inner wall 15 of the vacuum drying box body on the side face, the upper sliding table limiting baffle plate 22 is installed on the middle upper portion of the linear stroke assembly bottom plate 4, the lower sliding table limiting baffle plate 23 is installed at the bottom of the linear stroke assembly bottom plate 4, and bearings 24 are installed in the middle positions of the inner portions of the upper sliding table limiting baffle plate 22 and the lower sliding table limiting baffle plate 23;
the linear guide 6 is provided with a movable sliding table 7, a rigid cantilever beam arm 8 is fixed on the front end face of the movable sliding table 7, a weighing sensor 9 is fastened at the bottom of the other end of the rigid cantilever beam arm 8, the weighing sensor 9 is used for weighing a weighing tray 12, and a temperature sensor 26 is mounted on the side wall of the rigid cantilever beam arm 8 right above the weighing sensor 9.
The topmost end of the linear stroke assembly is provided with a stepping motor 1, and the stepping motor 1 is fixed on the outer wall 13 of the vacuum drying box body.
The outer side of the inner wall 15 of the vacuum drying box body is welded with a flattening ring 18, the mechanical sealing element 2 is fastened on the flattening ring 18 and the inner wall 15 of the vacuum drying box body through a screw 16, and a vacuum sealing gasket 17 is further installed between the mechanical sealing element 2 and the flattening ring 18.
The screw rod 5 is divided into a transmission shaft section part at the middle upper part, a thread part at the middle lower part and a bottom shaft section part;
the transmission shaft section part of the middle upper part of the screw rod 5 penetrates through and is matched with a bearing 24 installed in a limiting baffle 22 on the sliding table, the thread part of the middle lower part of the screw rod 5 penetrates through and is meshed with a ball nut pair 19 installed inside the movable sliding table 7, the shaft section of the bottom of the screw rod 5 penetrates through and is matched with the bearing 24 installed in the limiting baffle 22 on the sliding table, linear guide rails 6 are respectively arranged on two sides of the screw rod 5, the two sides of the movable sliding table 7 are limitedly installed on the linear guide rails 6, and the upper end and the lower end of each linear guide rail 6 are respectively fixed on the limiting baffle 22 on the sliding table and the limiting baffle 23 on the sliding table.
A light thermal radiation reflecting plate 27 is fastened below the weighing sensor 9 and at the connecting rod section of the lifting hook 10.
The outer side of the weighing tray 12 is provided with a non-weighing tray 29, the weighing tray 12 is separated from the non-weighing tray 29, the area of the weighing tray 12 is 1/9-1/3 of the whole material layer area, and the rest are non-weighing trays 29.
The bottoms of the non-weighing material trays 29 and the weighing material trays 12 are heating plates 20, a weighing material tray limiting vertical plate 28 is arranged on the heating plates 20 in one circle of the weighing position, and the height of the weighing material tray limiting vertical plate 28 is 1-1.5 times of the height of the material tray.
The stepping motor 1, the weighing sensor 9 and the temperature sensor 26 are respectively connected with the data acquisition control system 14.
The aperture of the lifting ring 22 is 2-4 times of the lifting distance of the weighing sensor, namely 10-40 mm; the lifting hook is ensured to move within the range of the lifting ring all the time, and the large lifting ring is not lifted.
The utility model has the advantages that:
(1) the non-bearing type dynamic suspension weighing is adopted, the weighing sensor can not bear force when the weighing is not carried out, the problems that the existing long-term bearing lifting type or long-term pulled lifting type weighing system is large in additional part mass of the weighing system, the weighing sensor is deformed due to long-term stress, the resolution ratio of the weighing system is low, the long-term running precision is difficult to guarantee and the like are solved, the long-term running precision of the system is effectively guaranteed, the absolute resolution ratio and the effective range ratio of the weighing system are improved, and the detection precision of the water content of a dry product, particularly the final water content of a material is improved.
(2) And a mechanical sealing connecting piece is adopted to realize good sealing performance in the dynamic weighing process under a vacuum drying environment.
(3) The split type weighing material tray is adopted, so that the additional mass introduced by the weighing material tray is further reduced, and the resolution of the weighing system is improved.
Drawings
Fig. 1 is a front view of a conductive vacuum drying automatic weighing system.
Fig. 2 is a left side view of the conductive vacuum drying automatic weighing system.
Fig. 3 is an enlarged schematic view of the mechanical seal in sealing connection with the tank.
Fig. 4 is a top view of the weigh bed.
In the figure, 1, a stepping motor, 2, a mechanical sealing element 3, a coupler, 4, a linear stroke assembly bottom plate, 5, a screw rod, 6, a linear guide rail, 7, a movable sliding table, 8, a rigid cantilever beam, 9, a weighing sensor, 10, a lifting hook, 11, a hard lifting rod, 12, a weighing tray, 13, the outer wall of a vacuum drying box body, 14, a data acquisition control system 15, the inner wall of the vacuum drying box body 16, a screw 17, a sealing gasket 18, a leveling ring 19, a ball nut pair 20, a conduction heating plate 21, a lifting ring 22, an upper limiting baffle 23 of the sliding table, a lower limiting baffle 24 of the sliding table, a bearing 25, a lifting ring bottom plate 26, a temperature sensor 27, a heat radiation reflecting plate 28, a weighing tray limiting vertical plate 29 and a non-weighing tray are arranged.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-4, a vacuum drying weighing device is composed of a linear stroke component, a cantilever beam, a weighing sensor, a split type weighing tray, a data acquisition control system and the like.
The linear stroke assembly mainly comprises a stepping motor 1, a mechanical sealing element 2, a coupler 3, a linear stroke assembly bottom plate 4, a sliding table upper limit baffle 22, a linear guide rail 6, a screw rod 5, a movable sliding table 7, a sliding table lower limit baffle 23 and a bearing 24.
The topmost end of the linear stroke assembly is provided with a stepping motor 1, and the stepping motor 1 is fixed on the outer wall 13 of the vacuum drying box body;
as shown in fig. 1, a flattening compensation ring 18 is welded on the outer side of the middle arc top position of the top of the inner wall 15 of the vacuum drying box body, a mechanical sealing element 2 is fastened on the flattening compensation ring 18 and the inner wall 15 of the vacuum drying box body through a screw 16, and a vacuum sealing gasket 17 is further installed between the mechanical sealing element 2 and the flattening compensation ring 18;
the screw rod 5 is divided into a transmission shaft section part at the middle upper part, a thread part at the middle lower part and a bottom shaft section part;
an extension shaft at the lower end of the stepping motor 1 is connected with the upper end of a coupler 3 through a mechanical sealing element 2, and the lower end of the coupler 3 is fixedly connected with a transmission shaft section at the middle upper part of a screw rod 5;
the linear stroke assembly bottom plate 4 is fixed on the inner wall 15 of the vacuum drying box body on the side face, the upper sliding table limiting baffle plate 22 is installed on the middle upper portion of the linear stroke assembly bottom plate 4, the lower sliding table limiting baffle plate 23 is installed at the bottom of the linear stroke assembly bottom plate 4, and bearings 24 are installed in the middle positions of the inner portions of the upper sliding table limiting baffle plate 22 and the lower sliding table limiting baffle plate 23;
the middle upper transmission shaft section of the screw rod 5 penetrates through and is matched with a bearing 24 arranged in a sliding table upper limiting baffle 22, the middle lower thread section of the screw rod 5 penetrates through and is meshed with a ball nut pair 19 arranged inside a movable sliding table 7, the bottom shaft section of the screw rod 5 penetrates through and is matched with the bearing 24 arranged in the sliding table upper limiting baffle 22, two sides of the screw rod 5 are respectively provided with a linear guide rail 6, two sides of the movable sliding table 7 are limited and arranged on the linear guide rails 6, and the upper end and the lower end of each linear guide rail 6 are respectively fixed on the sliding table upper limiting baffle 22 and the sliding table lower limiting baffle 23;
a rigid cantilever beam arm 8 is fixed on the front end face of the movable sliding table 7, a weighing sensor 9 is fastened at the bottom of the other end of the rigid cantilever beam arm 8, a lifting hook 10 is installed at the bottom of the weighing sensor 9, the lifting hook 10 penetrates through a lifting ring 21, the bottom of the lifting ring 21 is fixedly connected to a lifting ring bottom plate 25, 4 hard lifting rods 11 are fixedly connected to the periphery of the lifting ring bottom plate 25, and the other ends of the 4 hard lifting rods 11 are connected to the four corners of a weighing tray 12;
the aperture of the hanging ring 21 is 2-4 times of the hoisting distance of the weighing sensor, namely 10-40 mm;
a temperature sensor 26 is arranged on the side wall of the rigid cantilever beam 8 right above the weighing sensor 9 and used for detecting the temperature of the weighing system and serving as a basis for carrying out subsequent temperature compensation and calibration on weighing data;
a light thermal radiation reflecting plate 27 is fastened on the connecting rod section of the lifting hook 10 below the weighing sensor 9, and the influence of thermal radiation generated by a heating plate on the temperature of the weighing sensor in the drying process can be greatly weakened;
the heating and the dry homogeneity on the same heating bed of material of conduction formula vacuum drying often are better, consequently can only weigh the quality of a part of material and represent the dry condition of whole bed of material, weigh the charging tray in this application for split type, weigh 1/9 ~ 1/3 of charging tray 12 area for whole bed of material area, all the other charging trays are non-weighing charging tray 29, the schematic diagram when the charging tray is whole bed of material area 1/9 is weighed to what fig. 3 shows, can further reduce the additional mass of weighing the charging tray and introducing like this, improve weighing system resolution ratio.
Furthermore, when the heating and drying uniformity among different material layers of the multi-layer conduction type vacuum drying is good, only one material layer is set as a weighing material layer, the split type weighing material disc 12 is arranged on the layer, and the mass of one part of the material is weighed to represent the drying condition of all the materials in the whole drying chamber.
The automatic weighing device also comprises a data acquisition control system 14; the data acquisition control system 14 is connected with the stepping motor 1, the weighing sensor 9 and the temperature sensor 26;
the utility model discloses a theory of operation:
the specific weighing process is as follows: the data acquisition control device automatically performs weighing at intervals of set weighing time (such as 10 minutes, and can be set by a user independently), the stepping motor 1 rotates in the forward direction, the screw 5 is driven to rotate through the mechanical sealing element 2 and the coupler 3, the ball nut pair 19 meshed with the screw 5 is transmitted to the transmission device, the ball nut pair 19 is enabled to ascend, under the ascending action of the ball nut pair 19 and the limit of the linear guide rail 6, the movable sliding table 7 ascends along the linear guide rail 6, the rigid cantilever beam arm 8 fixed on the movable sliding table 7 is driven to ascend vertically, the weighing sensor 9 is driven to ascend vertically, the weighing material tray 12 is lifted by the lifting hook 10, and after the weighing material tray 12 completely leaves the bottom conduction heating plate 20, the stepping motor 1 stops working;
at this time, the data acquisition control system 14 automatically acquires the weight data of the weighing sensor 9, acquires the weighing system temperature information of the temperature sensor 26, performs temperature compensation correction on the weighing system data based on the weighing system temperature information, and performs conversion on the water content of the material based on a water content calculation formula; automatically displaying and recording related data;
then the data acquisition control system controls the stepping motor 1 to rotate in the opposite direction by the same angle, the mechanical sealing element 2 and the coupler 3 drive the screw rod 5 to rotate in the opposite direction, the ball nut pair 19 meshed with the screw rod 5 is transmitted, under the descending action of the ball nut pair 19 and the limit of the linear guide rail 6, the movable sliding table 7 descends along the linear guide rail 6, the rigid cantilever beam arm 8 on the movable sliding table 7 is driven to descend vertically, the weighing sensor 9, the lifting hook 10 and the weighing tray 12 are driven to descend vertically, and when the weighing tray 12 completely falls on the conduction heating plate 20, the stepping motor 1 stops working and continues drying.
A weighing tray limiting vertical plate 28 is fixedly connected to one circle of the weighing position on the heating plate 20; the height of the weighing tray limiting vertical plate 28 is 1-1.5 times of the height of the weighing tray; in the dynamic weighing process, the weighing tray limiting vertical plate 28 limits the weighing tray 12 at the weighing position, and the unhooking phenomenon when the weighing tray deviates from the weighing position is prevented.
In the dynamic weighing process, the mechanical sealing element 2 ensures the vacuum tightness of the automatic weighing device in the rotating transmission under the vacuum environment.
In the drying process, the automatic weighing process is continuously and automatically carried out according to the set automatic weighing period until the detected water content is less than or equal to the set final water content, and the whole system stops working.
Claims (10)
1. A vacuum drying weighing device is characterized by comprising a linear stroke assembly, wherein the linear stroke assembly comprises a stepping motor (1), a mechanical sealing element (2), a coupler (3), a linear stroke assembly bottom plate (4), a sliding table upper limiting baffle (22), a linear guide rail (6), a screw rod (5), a movable sliding table (7), a sliding table lower limiting baffle (23) and a bearing (24);
an extension shaft at the lower end of the stepping motor (1) penetrates through the mechanical sealing element (2) to be connected with the upper end of the coupler (3), and the lower end of the coupler (3) is connected with a transmission shaft section at the middle upper part of the screw rod (5);
the linear stroke assembly bottom plate (4) is fixed on the inner wall (15) of the vacuum drying box body on the side face, the upper sliding table limiting baffle plate (22) is installed on the middle upper portion of the linear stroke assembly bottom plate (4), the lower sliding table limiting baffle plate (23) is installed at the bottom of the linear stroke assembly bottom plate (4), and bearings (24) are installed in the middle positions of the inner portions of the upper sliding table limiting baffle plate (22) and the lower sliding table limiting baffle plate (23);
be provided with on linear guide (6) and remove slip table (7), be fixed with rigidity cantilever beam arm (8) on the terminal surface before removing slip table (7), rigidity cantilever beam arm (8) other end bottom fastening has weighing sensor (9), and weighing sensor (9) are used for weighing of symmetry volume charging tray (12), install temperature sensor (26) on the rigidity cantilever beam arm (8) lateral wall directly over weighing sensor (9).
2. A vacuum drying weighing apparatus according to claim 1, wherein the topmost end of the linear stroke assembly is a stepping motor (1), and the stepping motor (1) is fixed on the outer wall (13) of the vacuum drying box.
3. A vacuum drying weighing apparatus according to claim 1, characterized in that a flattening ring (18) is welded on the outer side of the inner wall (15) of the vacuum drying box, a mechanical sealing element (2) is fastened on the flattening ring (18) and the inner wall (15) of the vacuum drying box through a screw (16), and a vacuum sealing gasket (17) is further installed between the mechanical sealing element (2) and the flattening ring (18).
4. A vacuum drying weighing apparatus according to claim 1, characterized in that the screw (5) is divided into a middle upper transmission shaft section part, a middle lower thread part and a bottom shaft section part;
the upper portion transmission shaft section part passes and cooperates with bearing (24) of installation in spacing baffle (22) on the slip table in lead screw (5), and lower part screw thread part passes and meshes with ball nut pair (19) that remove slip table (7) internally mounted in lead screw (5), and the bottom shaft section of lead screw (5) passes and cooperates with bearing (24) of installation in spacing baffle (22) on the slip table, and lead screw (5) both sides are equipped with linear guide (6) respectively, remove slip table (7) both sides spacing installation on linear guide (6), the upper and lower both ends of linear guide (6) are fixed respectively on spacing baffle (22) under spacing baffle (22), the slip table on spacing baffle (23) on the slip table.
5. A vacuum drying weighing apparatus according to claim 1, characterized in that a lightweight thermal radiation reflecting plate (27) is fastened to the connecting rod section of the lifting hook (10) below the weighing sensor (9).
6. The vacuum drying weighing device according to claim 1, characterized in that the non-weighing tray (29) is arranged outside the weighing tray (12), the weighing tray (12) and the non-weighing tray (29) are separated, the area of the weighing tray (12) is 1/9-1/3 of the whole material layer area, and the rest are the non-weighing trays (29).
7. The vacuum drying weighing device according to claim 6, characterized in that the bottoms of the non-weighing trays (29) and the weighing trays (12) are both heating plates (20), a weighing tray limiting vertical plate (28) is arranged on one circle of the weighing position on the heating plates (20), and the height of the weighing tray limiting vertical plate (28) is 1-1.5 times of the height of the trays.
8. A vacuum drying weighing apparatus according to claim 1, characterized in that the stepping motor (1), the weighing sensor (9) and the temperature sensor (26) are respectively connected with the data acquisition control system (14).
9. The vacuum drying weighing device according to claim 1, wherein a lifting hook (10) is installed at the bottom of the weighing sensor (9), the lifting hook (10) penetrates through a lifting ring (21), the bottom of the lifting ring (21) is fixedly connected to a lifting ring bottom plate (25), one end of 4 hard suspension rods (11) is connected to the periphery of the lifting ring bottom plate (25), and the other end of the 4 hard suspension rods (11) is connected to four corners of the weighing tray (12).
10. A vacuum drying weighing apparatus according to claim 9, characterized in that the aperture of the lifting ring (21) is 2-4 times the lifting distance of the weighing sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120887087.4U CN214894651U (en) | 2021-04-27 | 2021-04-27 | Vacuum drying weighing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120887087.4U CN214894651U (en) | 2021-04-27 | 2021-04-27 | Vacuum drying weighing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214894651U true CN214894651U (en) | 2021-11-26 |
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ID=78947348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120887087.4U Expired - Fee Related CN214894651U (en) | 2021-04-27 | 2021-04-27 | Vacuum drying weighing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214894651U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188944A (en) * | 2021-04-27 | 2021-07-30 | 陕西科技大学 | Conduction type vacuum drying automatic weighing system |
-
2021
- 2021-04-27 CN CN202120887087.4U patent/CN214894651U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188944A (en) * | 2021-04-27 | 2021-07-30 | 陕西科技大学 | Conduction type vacuum drying automatic weighing system |
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Granted publication date: 20211126 |