High-precision weighing and conveying structure

Abstract

The utility model relates to a high-precision weighing and conveying structure which comprises a sending tank, a screw conveyor, a first control valve and a rotary discharging valve which are sequentially connected, and the sending tank is placed on a weighing module; a rotatable multi-blade valve plate is mounted in the rotary discharge valve, and the input end and the output end of the rotary discharge valve are always separated by the multi-blade valve plate; the output end of the rotary discharging valve communicates with the atmosphere end and the negative pressure extraction device, the screw conveyor is transversely arranged, and the input end and the output end are arranged on the two sides of the screw conveyor correspondingly. An output port is formed in the bottom of the sending tank; and the output port of the sending tank is butted with the input end of the screw conveyor. According to the utility model, the rotary discharge valve can be closed in a manner of forming air seal through the multi-blade valve plate, so that the negative pressure transmission is avoided, and the precision is not influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic conveying equipment and relates to a high-precision weighing and conveying structure. Background Art

[0002] In the existing negative pressure conveying technology, the material enters the soft connection from the sending tank through the screw conveyor from the first control valve, and there is a ball valve or butterfly valve under the soft connection. Since the mass of the conveyed material is measured by the metering module, during negative pressure conveying, the ball valve and another valve are opened at the same time, and the soft connection is affected by the negative pressure, and a tension Ft appears. Since the valve and the screw conveying mechanism are rigidly connected to the sending tank, they can be regarded as a rigid body m, which is equivalent to the soft connection applying a pulling force to the tank body. This will cause the mass calculated by the metering module to be generated by the gravity of the rigid body m and the tension Ft. And the tension is changing due to the influence of the material in the soft connection and the size of the negative pressure, so the metering value of the metering module is very unstable. Summary of the invention

[0003] The utility model aims to provide a high-precision weighing and conveying structure, which can solve the problem that the metering value of the metering module is very unstable.

[0004] According to the technical solution provided by the utility model: a high-precision weighing and conveying structure includes a sending tank, a screw conveyor, a first control valve, and a rotary discharge valve connected in sequence, and the sending tank is placed on the weighing module; a rotatable multi-blade valve plate is installed in the rotary discharge valve, and the multi-blade valve plate always separates the input end and the output end of the rotary discharge valve; the output end of the rotary discharge valve is respectively connected to the atmosphere end and the negative pressure extraction device.

[0005] As a further improvement of the utility model, the screw conveyor is arranged horizontally, and an input end and an output end are respectively arranged on both sides of the screw conveyor; an output port is opened at the bottom of the sending tank; and the output port of the sending tank is connected to the input end of the screw conveyor.

[0006] As a further improvement of the present utility model, the first control valve is a ball valve.

[0007] As a further improvement of the utility model, the rotary discharge valve is provided with an input end and an output end at the upper and lower ends, and the first control valve is connected to the input end of the rotary discharge valve through a soft connection.

[0008] As a further improvement of the utility model, the rotary discharge valve comprises a housing, in which a rotatable multi-blade valve plate is installed, and the multi-blade valve plate is driven by a motor through a reducer; and a plurality of material cavities are separated between the multi-blade valve plates.

[0009] As a further improvement of the utility model, the atmosphere end includes an air chamber connected to the atmosphere, and the air chamber is connected to the negative pressure extraction device through an atmosphere control valve.

[0010] As a further improvement of the utility model, a filter plate is installed in the air chamber.

[0011] The positive effects of this application are:

[0012] The utility model can close the rotary discharge valve by forming an air seal through the multi-blade valve plate, thereby avoiding negative pressure transmission and affecting the accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model.

[0014] Figure 2 It is a structural schematic diagram of the rotary discharge valve of the utility model.

[0015] Figure 1-Figure 2 The device comprises a weighing module 1, a sending tank 2, a first control valve 3, a rotary discharge valve 4, a screw conveyor 5, a soft connection 6 and the like. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0017] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the utility model described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed can also be "included" and "having"; for example, a process, method, system, product or device that can include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0019] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text expression.

[0020] like Figure 1 As shown, the utility model is a high-precision weighing and conveying structure, comprising a sending tank 2, under which a screw conveyor 5, a first control valve 3, and a rotary discharge valve 4 are arranged in sequence; the above components are connected in sequence, and the sending tank 2 is placed on a weighing module 1. A rotatable multi-leaf valve plate 4-1 is installed in the rotary discharge valve 4, and the multi-leaf valve plate 4-1 always separates the input end and the output end of the rotary discharge valve 4.

[0021] The screw conveyor 5 is arranged horizontally, and an input end and an output end are respectively arranged on both sides of the screw conveyor 5; an output port is opened at the bottom of the sending tank 2; and the output port of the sending tank 2 is connected to the input end of the screw conveyor 5.

[0022] The first control valve 3 is a ball valve. The rotary discharge valve 4 has an input end and an output end at both ends, and the first control valve 3 is connected to the input end of the rotary discharge valve 4 through a flexible connection 6.

[0023] like Figure 2 As shown, the rotary discharge valve 4 comprises a housing 4-2, in which a rotatable multi-leaf valve plate 4-1 is installed, and the multi-leaf valve plate 4-1 is driven by a motor 4-3 through a reducer 4-4. A plurality of material chambers 4-5 are separated between the multi-leaf valve plates 4-1.

[0024] The output end of the rotary discharge valve 4 is connected to the atmosphere end and the negative pressure extraction device (not shown). The negative pressure extraction device takes away the material flowing out from the output end of the rotary discharge valve 4, and the atmosphere end provides an air source for the negative pressure extraction device. The atmosphere end includes an air chamber 7 connected to the atmosphere, and the air chamber 7 is connected to the negative pressure extraction device through an atmosphere control valve 8, and a filter plate is installed in the air chamber 7.

[0025] The working process of the utility model is as follows:

[0026] The material enters the soft connection 6 from the sending tank 2 through the screw conveyor 5 and the first control valve 3. Since the rotary discharge valve 4 has a multi-blade valve plate 4-1 rotating in the shell 4-2, the multi-blade valve plate 4-1 always separates the input end and the output end of the rotary discharge valve 4. The negative pressure connected to the output end of the rotary discharge valve 4 will not enter the sending tank 2, the screw conveyor 5, and the soft connection 6 from bottom to top, and the negative pressure will not affect the weighing module 1 to measure the sending tank 2.

[0027] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high-precision weighing and conveying structure, characterized in that: The invention comprises a sending tank (2), a screw conveyor (5), a first control valve (3), and a rotary discharge valve (4) which are connected in sequence. The sending tank (2) is placed on a weighing module (1). A rotatable multi-blade valve plate (4-1) is installed in the rotary discharge valve (4). The multi-blade valve plate (4-1) always separates the input end and the output end of the rotary discharge valve (4). The output end of the rotary discharge valve (4) is respectively connected to the atmosphere end and the negative pressure extraction device.

2. The high-precision weighing and conveying structure according to claim 1, characterized in that: The screw conveyor (5) is arranged horizontally, and an input end and an output end are respectively arranged on both sides of the screw conveyor (5); an output port is opened at the bottom of the sending tank (2); and the output port of the sending tank (2) is connected to the input end of the screw conveyor (5).

3. The high-precision weighing and conveying structure according to claim 1, characterized in that: The first control valve (3) is a ball valve.

4. The high-precision weighing and conveying structure according to claim 2, characterized in that: The rotary discharge valve (4) is provided with an input end and an output end at the upper and lower ends, and the first control valve (3) is connected to the input end of the rotary discharge valve (4) via a flexible connection (6).

5. The high-precision weighing and conveying structure according to claim 1, characterized in that: The rotary discharge valve (4) comprises a housing (4-2), a rotatable multi-blade valve plate (4-1) is installed in the housing (4-2), and the multi-blade valve plate (4-1) is driven by a motor (4-3) through a reducer (4-4); a plurality of material chambers (4-5) are spaced between the multi-blade valve plates (4-1).

6. The high-precision weighing and conveying structure according to claim 1, characterized in that: The atmospheric end comprises an air chamber (7) connected to the atmosphere, and the air chamber (7) is connected to the negative pressure extraction device via an atmospheric control valve (8).

7. The high-precision weighing and conveying structure according to claim 6, characterized in that: A filter plate is installed in the air chamber (7).

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