Material negative pressure drying device

Abstract

The utility model discloses a negative pressure drying device for materials, comprising a drying box and a negative pressure generating device, wherein the negative pressure generating device is connected to the top of the drying box through a negative pressure pipe, a top heating device is installed in the drying box, the drying box is a closed box structure, a material port connected to the inside of the drying box is provided on one side of the drying box, a box cover that can be covered on the drying box and seal the material port is provided on the outer side of the drying box, a loading tray is built into the drying box, the loading tray can enter and exit the drying box through the material port, the loading tray is supported in the drying box by a supporting platform, so that the loading tray is spaced apart from the inner bottom surface of the drying box, a plurality of air holes are provided at the bottom of the loading tray, and an air inlet is provided at the bottom of the drying box and below the loading tray. The utility model has a simple structure, is convenient and reliable to use, and in the process of extracting water vapor, the airflow passing through the material layer below takes away the water vapor accumulated inside the material layer, thereby improving the drying efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of material drying, in particular to a negative pressure material drying device. Background Art

[0002] In the detection of concrete aggregates, aggregate drying is an important link. For example, the detection of aggregate mud and powder content, moisture content, apparent density, etc., all require the aggregate to be dried once or multiple times. The traditional drying method is constant temperature box drying. A material port is set on one side of the drying box, through which materials can be discharged or taken out of the drying box. The top of the drying box is also connected to a negative pressure pipe, and the other end of the negative pressure pipe is connected to a negative pressure generating device. During the drying process, the extraction of negative pressure can reduce the air pressure in the drying box and increase the water volatilization rate. At the same time, after the water in the material evaporates, it will rise and be extracted by the negative pressure pipe, thereby improving the drying efficiency of the aggregate. When the aggregate is dried in the drying box, it is usually spread in the loading tray, but the spread aggregate still has a certain thickness. The water vapor generated after drying inside will be hindered to a certain extent, and it is not easy to dissipate from the inside to the outside of the aggregate layer and be extracted by the negative pressure. This leads to a prolonged drying time of the aggregate, and thus cannot meet the efficient and rapid detection of the aggregate. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a negative pressure drying device for materials which can shorten the drying time, improve the drying efficiency and reduce the energy consumption.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A negative pressure drying device for materials comprises a drying box and a negative pressure generating device, wherein the negative pressure generating device is connected to the top of the drying box through a negative pressure pipe, a top heating device is installed in the drying box, the drying box is a closed box structure, a material port connected to the inside of the drying box is provided on one side surface of the drying box, a box cover which can be covered on the drying box and seal the material port is provided on the outer side surface of the drying box, a loading tray is built in the drying box, the loading tray can enter and exit the drying box through the material port, the loading tray is supported in the drying box by a supporting platform, so that the loading tray is spaced apart from the inner bottom surface of the drying box, a plurality of air holes are penetrated through the bottom of the loading tray, and an air inlet is provided at the bottom of the drying box and below the loading tray.

[0006] In the utility model, the material is placed in the collecting tray in the drying box, the box cover is closed, the top heating device is started for heating, and the negative pressure generating device is started at the same time. Gas is extracted from the top of the drying box through the negative pressure pipe, and the air pressure in the drying box is reduced, so that the gas outside the drying box can enter the drying box through the air inlet at the bottom of the drying box. Since the negative pressure pipe above extracts gas, the pressure at this position is relatively small, so the gas entering the drying box will flow upward. In this process, part of the gas will pass through the air holes at the bottom of the loading tray, and then pass through the material spread on it, so that the moisture that is not easy to dissipate inside the material layer can be taken away, so that the material drying efficiency is improved, the drying time is shortened, and the energy consumption is reduced.

[0007] As an optimization, drainage pipes are respectively arranged in the drying box and located above and below the charging tray. The drainage pipes are vertically arranged reducers, and the large diameter end of the drainage pipe faces the charging tray. The small diameter end of the drainage pipe located above the charging tray is fixedly sealed and connected to the top of the drying box, and the small diameter end of the drainage pipe located below the charging tray is fixedly sealed and connected to the bottom of the drying box. The negative pressure pipe is connected to the interior of the drainage pipe at the top, and the air inlet is connected to the interior of the drainage pipe at the bottom. The top heating device is placed at the large diameter end of the drainage pipe at the top, and the projection of the charging tray in the vertical direction is located within the projection of the large diameter end of the drainage pipe in the vertical direction. The airflow enters the drainage pipe at the bottom from the bottom. Due to the reducer structure of the drainage pipe, the airflow can be spread, fully contact the bottom of the charging tray and pass through more air holes, so that the material is dried more evenly. At the same time, the drainage pipe at the top can conveniently gather the rising airflow and discharge it outward.

[0008] As an optimization, a bottom heating device is installed below the loading tray, and the bottom heating device is placed at the large diameter end of the drainage pipe at the bottom, so as to further improve the drying capacity of the material.

[0009] As an optimization, the top heating device and the bottom heating device are both electric heating tubes with a spiral disc structure and arranged horizontally.

[0010] As an optimization, a fixed platform is fixedly connected to the outer surface of the drying box at a position below the material opening, the box cover is slidably connected to the fixed platform, the box cover can slide toward the direction of the material opening and the cover is arranged at the material opening, the support platform is fixedly connected to the inner side of the box cover, when the box cover slides on the fixed platform, the support platform and the loading tray can both enter and exit the drying box through the material opening. By opening the box cover, the loading tray can be taken out of the drying box at the same time, which is more convenient to operate.

[0011] As an optimization, a driving device for driving the box cover to slide on the fixed platform is installed on the fixed platform. It is more convenient to control the opening and closing of the box cover by electric control.

[0012] As an optimization, a circle of sealing strip is installed on the side surface of the box cover facing the material opening. When the box cover is placed on the drying box, the material opening is located in the sealing area inside the sealing strip.

[0013] As an optimization, the support platform includes a support plate that is horizontally arranged and fixedly connected to the box cover, a bottom hole is penetrated in the vertical direction on the support plate, and a plurality of support seats are fixedly connected to the upper surface of the support plate and the position outside the bottom hole, and the loading tray includes a bottom plate that is horizontally arranged, the bottom plate is placed at the bottom hole, the air vent is arranged on the bottom plate, and a side enclosure arranged around the edge of the bottom plate is fixedly connected to the edge of the upper surface of the bottom plate, and a convex ring arranged around the side enclosure is formed on the outer surface of the side enclosure, and the convex ring is placed on the top of the support seat. It is convenient to place and take out the loading tray and replace the materials easily.

[0014] As an optimization, the outer surface of the drying box is covered with a heat insulation layer.

[0015] As an optimization, an air inlet pipe is fixedly connected to the bottom of the drying box, and the air inlet pipe is connected to the drying box through the air inlet hole. A control valve for controlling the opening size of the air inlet pipe is installed on the air inlet pipe. Different materials have different requirements for the drying environment, and the vacuum degree in the drying box can be controlled by the control valve.

[0016] Compared with the prior art, the utility model has the following advantages: the utility model has a simple structure and is easy and reliable to use. By opening and closing the box cover, the material can be conveniently arranged. At the same time, in the process of water vapor extraction, the airflow passing through the material layer below can take away the water vapor accumulated inside the material layer, thereby improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of the drying box in the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0019] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1As shown, the negative pressure drying device for materials in this specific embodiment includes a drying box 1 and a negative pressure generating device, the negative pressure generating device is connected to the top of the drying box 1 through a negative pressure pipe 2, a top heating device is installed in the drying box 1, the drying box 1 is a closed box structure, a material port connected to the inside of the drying box 1 is opened on one side surface of the drying box 1, a box cover 4 which can be covered on the drying box 1 and seal the material port is provided on the outer side surface of the drying box 1, a loading tray is built in the drying box 1, the loading tray can enter and exit the drying box 1 through the material port, the loading tray is supported in the drying box 1 by a supporting platform, so that the loading tray and the inner bottom surface of the drying box 1 are separated, a plurality of air holes are penetrated at the bottom of the loading tray, and an air inlet is opened at the bottom of the drying box 1 and below the loading tray.

[0021] In this specific embodiment, drainage pipes 5 are respectively provided in the drying box 1 and at positions above and below the charging tray, the drainage pipes 5 are vertically arranged reducers, the large diameter end of the drainage pipe 5 faces the charging tray, the small diameter end of the drainage pipe 5 located above the charging tray is fixedly sealed and connected to the top of the drying box 1, and the small diameter end of the drainage pipe 5 located below the charging tray is fixedly sealed and connected to the bottom of the drying box 1, the negative pressure pipe 2 is connected to the interior of the drainage pipe 5 near the top, the air inlet is connected to the interior of the drainage pipe 5 near the bottom, the top heating device is placed at the large diameter end pipe opening of the drainage pipe 5 near the top, and the projection of the charging tray in the vertical direction is located within the projection of the large diameter end pipe opening of the drainage pipe 5 in the vertical direction.

[0022] In this specific embodiment, a bottom heating device 6 is also installed below the charging tray, and the bottom heating device 6 is placed at the large-diameter end of the drainage pipe 5 at the bottom.

[0023] In this specific implementation, the top heating device and the bottom heating device 6 are both electric heating tubes that are in a spiral disc structure and are arranged horizontally.

[0024] In this specific embodiment, a fixed platform 7 is fixedly connected to the outer surface of the drying box 1 at a position corresponding to the bottom of the material port, the box cover 4 is slidably connected to the fixed platform 7, the box cover 4 can slide in the direction of the material port and the cover is arranged at the material port, the support platform is fixedly connected to the inner side surface of the box cover 4, and when the box cover 4 slides on the fixed platform 7, the support platform and the loading tray can both enter and exit the drying box 1 through the material port.

[0025] In this specific implementation, a driving device 8 for driving the box cover 4 to slide on the fixed platform 7 is installed on the fixed platform 7 .

[0026] In this specific implementation, a sealing strip is installed on the side surface of the box cover 4 facing the material opening. When the box cover 4 is placed on the drying box 1, the material opening is located in the sealing area inside the sealing strip.

[0027] In this specific embodiment, the support platform includes a support plate 9 which is horizontally arranged and fixedly connected to the box cover 4, a bottom hole is penetrated in the vertical direction on the support plate 9, and a plurality of support seats 10 are fixedly connected to the upper surface of the support plate 9 and located outside the bottom hole. The loading tray includes a horizontally arranged bottom plate, the bottom plate is placed at the bottom hole, the air vents are arranged on the bottom plate, and a side enclosure 12 arranged around the edge of the bottom plate is fixedly connected to the edge of the upper surface of the bottom plate, and a convex ring 13 arranged around the side enclosure 12 is formed on the outer surface of the side enclosure 12, and the convex ring 13 is placed on the top of the support seat 10.

[0028] In this specific implementation, the outer surface of the drying box 1 is covered with a heat insulation layer 14 .

[0029] In this specific embodiment, an air inlet pipe 11 is fixedly connected to the bottom of the drying box 1 , the air inlet pipe 11 is connected to the drying box 1 through the air inlet hole, and a control valve 3 for controlling the opening size of the air inlet pipe 11 is installed on the air inlet pipe 11 .

[0030] In the specific implementation process, the drying box 1 is equipped with a sensor for detecting the internal air pressure and temperature, which can monitor the drying process in real time. The negative pressure pipe is equipped with a sensor for detecting the humidity of the gas extracted in the negative pressure pipe. By detecting the humidity, the degree of material drying can be judged to reduce energy consumption. The top heating device and the bottom heating device can also be preheated in advance through the corresponding program control to further improve the drying efficiency. The negative pressure generating device can use a water ring vacuum pump, and use a circulating water tank to supply water to the vacuum pump to save water consumption. The circulating water tank is provided with a temperature sensor and a liquid level sensor. After the temperature of the circulating water exceeds the set upper limit, the water can be automatically changed.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described by referring to the preferred embodiments of the utility model, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A negative pressure drying device for materials, comprising a drying box and a negative pressure generating device, wherein the negative pressure generating device is connected to the top of the drying box through a negative pressure pipe, and a top heating device is installed in the drying box, characterized in that: The drying box is a closed box structure, and a material port connected to the interior of the drying box is provided on one side surface of the drying box, and a box cover that can be covered on the drying box and seal the material port is provided on the outer side of the drying box. A loading tray is built into the drying box, and the loading tray can enter and exit the drying box through the material port. The loading tray is supported in the drying box by a supporting platform, so that the loading tray is separated from the inner bottom surface of the drying box, and a plurality of air holes are penetrated at the bottom of the loading tray, and an air inlet is provided at the bottom of the drying box and below the loading tray.

2. The negative pressure drying device for materials according to claim 1, characterized in that: Drainage pipes are respectively arranged in the drying box and at positions above and below the charging tray. The drainage pipes are vertically arranged reducers, and the large diameter end of the drainage pipe faces the charging tray. The small diameter end of the drainage pipe located above the charging tray is fixedly sealed and connected to the top of the drying box, and the small diameter end of the drainage pipe located below the charging tray is fixedly sealed and connected to the bottom of the drying box. The negative pressure pipe is communicated with the interior of the drainage pipe near the top, and the air inlet is communicated with the interior of the drainage pipe near the bottom. The top heating device is placed at the large diameter end of the drainage pipe near the top, and the projection of the charging tray in the vertical direction is located within the projection of the large diameter end of the drainage pipe in the vertical direction.

3. The negative pressure drying device for materials according to claim 2, characterized in that: A bottom heating device is also installed below the charging tray, and the bottom heating device is placed at the large-diameter end of the drainage pipe at the bottom.

4. The negative pressure drying device for materials according to claim 3 is characterized in that: The top heating device and the bottom heating device are both electric heating tubes that are in a spiral disc structure and are arranged horizontally.

5. The negative pressure drying device for materials according to claim 1, characterized in that: A fixed platform is fixedly connected to the outer surface of the drying box at a position corresponding to the bottom of the material opening, the box cover is slidably connected to the fixed platform, the box cover can slide in the direction of the material opening and is arranged at the material opening, the support platform is fixedly connected to the inner side surface of the box cover, and when the box cover slides on the fixed platform, the support platform and the loading tray can both enter and exit the drying box through the material opening.

6. The negative pressure drying device for materials according to claim 5, characterized in that: The fixed platform is provided with a driving device for driving the box cover to slide on the fixed platform.

7. The negative pressure drying device for materials according to claim 5, characterized in that: A sealing strip is installed on a side surface of the box cover facing the material opening. When the box cover is placed on the drying box, the material opening is located in a sealing area on the inner side of the sealing strip.

8. The negative pressure drying device for materials according to claim 5, characterized in that: The support platform includes a support plate which is horizontally arranged and fixedly connected to the box cover, a bottom hole is penetrated in the vertical direction on the support plate, a plurality of support seats are fixedly connected to the upper surface of the support plate and at the position outside the bottom hole, the loading tray includes a horizontally arranged bottom plate, the bottom plate is placed at the bottom hole, the air vents are arranged on the bottom plate, a side enclosure arranged around the edge of the bottom plate is fixedly connected to the edge of the upper surface of the bottom plate, a convex ring arranged around the side enclosure is convexly formed on the outer surface of the side enclosure, and the convex ring is placed on the top of the support seat.

9. The negative pressure drying device for materials according to claim 1, characterized in that: The outer surface of the drying box is covered with a heat insulation layer.

10. The negative pressure drying device for materials according to claim 1, characterized in that: An air inlet pipe is fixedly connected to the bottom of the drying box, the air inlet pipe is communicated with the drying box through the air inlet hole, and a control valve for controlling the opening size of the air inlet pipe is installed on the air inlet pipe.

Images