Automatic adjusting device for gap between pressing plates at discharge port of screw press

Abstract

The utility model aims to provide the automatic adjusting device for the gap between the pressing plates at the discharge hole of the screw press so as to solve the problems of inconvenience in adjustment or high cost and the like in the prior art. The automatic adjusting device for the gap of the pressing plate at the discharge hole of the screw press is designed in a structural space of a connecting transmission shaft of a motor speed reducer and a screw as well as a material outlet and the pressing plate, and consists of an annular elastic body surrounded in the connecting space of the discharge hole outside the transmission shaft and the motor speed reducer, particularly a steel spring or an annular rubber air bag spring; the inner diameter of the annular elastic body is larger than the diameter of the transmission shaft so that the transmission shaft can penetrate through the annular elastic body, the outer diameter of the annular elastic body is smaller than the outer diameter of the discharge port pressing plate, and one end of the annular elastic body is pressed on the discharge port pressing plate while the other end of the annular elastic body is supported on a supporting steel plate of the annular elastic body. And the distance between the supporting plate of the annular elastic body and the mounting steel plate of the motor speed reducer can be adjusted through the bolts, so that the set pressure of the elastic body on the pressing plate of the discharge port can be adjusted. The annular rubber air bag can also adjust the set pressure of the pressing plate at the discharge port by controlling the amount of the supplied compressed air.

Description

Technical field:

[0001] The invention relates to the field of solid-liquid separation, and in particular to an automatic adjustment device for the gap between pressure plates at a discharge port of a screw press. Background technology:

[0002] The solid-liquid separation screw press is widely used for the preliminary separation of solid and liquid, and can separate solid materials from solid-liquid mixed materials. The solid-liquid mixed material enters the spiral cavity with filtering function, and the volume between the spiral and the cavity decreases step by step. The spiral rotates to convey the material to squeeze and remove the liquid, and the liquid is filtered and discharged from the cavity step by step. There is a pressure plate at the solid material outlet of the screw press. By adjusting the outlet gap, on the one hand, the solid material can be extruded, and on the other hand, the material maintains sufficient pressure in the cavity to fully extrude the liquid. The common screw stacking machine on the market generally adjusts the outlet gap by adjusting the position of the tightening pressure plate on the spiral outlet connecting shaft. It needs to be adjusted manually by screwing, which is troublesome, the environment is relatively dirty, and the adjustment is not timely. There is also a screw press outlet pressure plate connected to a heavy hammer through a long handle to form a lever mechanism, which forms a pressure balance with the extruded material to automatically adjust the outlet gap, but it occupies a large space. Once the heavy hammer lever mechanism is made, it is not convenient to adjust it. There is also a method of using a group of electro-hydraulic push rods to electrically adjust the outlet pressure plate gap, manually set the adjustment gap, and rely on a group of pressure detection sensors to form automatic control feedback, which has high manufacturing costs. Summary of the invention:

[0003] The object of the present invention is to provide an automatic adjustment device for the gap between pressure plates at a discharge port of a screw press, so as to solve the problems of inconvenient adjustment or high cost in the prior art.

[0004] In order to solve the above technical problems, the specific technical solution of the automatic adjustment device for the gap between the pressure plates at the outlet of a screw press of the present invention is as follows:

[0005] The screw press extrudes solid materials under pressure when they are discharged. At the same time, in order to squeeze out more liquid in the solid materials, the outlet pressure plate needs to be able to continuously apply pressure to the solid materials, increase the extrusion of the materials, and form mutual impact. The volume, solid-liquid ratio, and resistance of the material in the spiral cavity are constantly changing. Therefore, the pressure acting on the outlet pressure plate will also change. Assuming that the pressure plate gap is fixed, if the gap is too small, it will cause blockage until the screw locks and the machine trips; if the gap is too large, the pressure on the material is insufficient and the liquid is not fully removed. Therefore, according to the mechanism of action between the pressure plate gap at the outlet of the screw press and the material, it is very necessary to design an automatic adjustment device that can adjust the pressure plate gap and reaction force at the outlet of the screw press as the resistance force of the material changes.

[0006] The automatic adjustment device for the gap between the discharge port pressure plate of the screw press is designed in the structural space between the motor reducer and the connecting transmission shaft of the screw and the material outlet and the pressure plate. It is composed of a circular elastic body surrounded by the outer discharge port of the transmission shaft and the connection space between the motor reducer, specifically a steel spring or a circular rubber airbag spring, whose inner diameter is larger than the diameter of the transmission shaft so that the transmission shaft can pass through, and whose outer diameter is smaller than the outer diameter of the discharge port pressure plate. One end is pressed on the discharge port pressure plate, and the other end is supported on the supporting steel plate of the circular elastic body. The supporting steel plate is fixed to the mounting steel plate of the motor reducer by bolts, and the distance between the supporting plate of the circular elastic body and the mounting steel plate of the motor reducer can be adjusted by bolts to achieve the setting pressure adjustment of the discharge port pressure plate by the elastic body. The circular rubber airbag can also adjust the setting pressure of the discharge port pressure plate by controlling the amount of compressed air supplied.

[0007] The design and selection of the annular elastic body is based on the measurement of the outlet pressure plate pressure of the screw press when the solid material is discharged optimally, and then calculated according to Hooke's law △F=k△X, and the design selects suitable elastic materials and reasonable structures to make suitable elastic bodies. The elastic body and the adjustable support plate together constitute the automatic adjustment device for the pressure plate gap at the outlet of the screw press. The shape, specifications and sizes of the automatic adjustment device for the pressure plate gap at the outlet of the screw press are different for screw presses of different types and specifications, and different models and specifications need to be measured, calculated and designed. Description of the drawings:

[0008] Figure 1 Schematic diagram of the automatic adjustment device for the gap between the pressure plates at the outlet of the screw press

[0009] In the figure: 1. Motor reducer; 2. Spiral connecting drive shaft; 3. Discharge port; 4. Press plate; 5. Circular elastic body;

[0010] 6. Support steel plate; 7. Install steel plate; 8. Bolts Specific implementation method:

[0011] Firstly, according to the outlet pressure plate pressure of the screw press when the solid is discharged optimally, and then according to Hooke's law △F=k△X, calculation is performed, and suitable elastic materials and reasonable structures are selected to design and make suitable elastomers. The elastomers are designed to form an automatic adjustment device for the gap between the outlet pressure plates of the screw press together with the adjustable distance support plate.

[0012] Hooke's law can be expressed as follows: When the stress is below the proportional limit, the stress σ in the solid is proportional to the strain ε, that is, σ = Εε, where E is a constant, called the elastic modulus or Young's modulus. By extending Hooke's law to the three-dimensional stress and strain state, the generalized Hooke's law can be obtained. The mathematical formula of the generalized Hooke's law applied to the three-dimensional stress and strain state and isotropic materials is:

[0013] σ11=λ(ε11+ε22+ε33)+2Gε11, σ23=2Gε23,

[0014] σ22=λ(ε11+ε22+ε33)+2Gε22, σ31=2Gε31,

[0015] σ33=λ(ε11+ε22+ε33)+2Gε33, σ12=2Gε12,

[0016] Where σij is the stress component; εij is the strain component (i, j = 1, 2, 3); λ and G are Lame constants, G is also called shear modulus; E is the elastic modulus or Young's modulus.

[0017] Through calculation, design and selection of appropriate elastic materials and reasonable structures to make suitable elastomers.

[0018] The automatic adjustment device for the gap between the discharge port and the pressure plate of the screw press is designed in the structural space between the motor reducer 1 and the spiral connection transmission shaft 2, the discharge port 3 and the pressure plate 4. It is composed of a circular elastic body 5 surrounded by the connection space between the discharge port 3 outside the transmission shaft 2 and the motor reducer 1, specifically a steel spring or a circular rubber airbag spring, whose inner diameter is larger than the diameter of the transmission shaft 2 so that the transmission shaft can pass through, and whose outer diameter is smaller than the outer diameter of the discharge port pressure plate 4. One end is pressed on the discharge port pressure plate 4, and the other end is supported on the support steel plate 6 of the circular elastic body 5. The support steel plate 6 is fixed on the mounting steel plate 7 of the motor reducer 1 by bolts 8, and the distance between the support steel plate 6 of the circular elastic body 5 and the mounting steel plate 7 of the motor reducer 1 can be adjusted by rotating the bolts 8, so as to adjust the set pressure of the discharge port pressure plate 4 by the elastic body 5. The circular rubber airbag can also adjust the set pressure of the discharge port pressure plate by controlling the amount of compressed air supplied, and the airbag needs to have a set of pressure measurement automatic air replenishment and pressure maintenance device.

[0019] The automatic gap adjustment device of the pressure plate 4 at the outlet 3 of the screw press has a specific operation mode as follows: before the screw press is started and in the initial stage of operation when no material is extruded, the pressure plate 4 at the outlet 3 is completely closed without a gap, the material in the spiral cavity is dehydrated and becomes dry, the solid material gathers more and more, the extrusion pressure becomes larger and larger, and exceeds the pressure of the elastic body 5, the pressure plate 4 is slowly pushed open, and the dehydrated material is slowly extruded from the top-opened gap, and the subsequent material is squeezed out of the liquid in the material under the combined pressure of the spiral travel pressure and the blocking pressure of the elastic body 5. The more the material is squeezed, the greater the top pressure, and the pressure plate 4 is continuously squeezed, and the gap becomes larger and larger until the pressure balance gap is fixed, and the solid material is continuously extruded from the outlet. In the meantime, if the material feed amount is reduced or softened instantly, the pressure plate 4 will rebound instantly to reduce the gap; if the material feed amount is increased or hardened instantly, the pressure plate 4 will be lifted instantly to increase the gap. During the solid-liquid separation process of the screw press, the automatic adjustment of the gap between the pressure plates 4 at the discharge port 3 is always involved. The gap size setting has been basically calculated according to Hooke's law. As for the screw press and the material differences, individual small-range adjustments can be made. It is only necessary to adjust the fixing bolts 8 during the equipment debugging at the beginning of the installation and commissioning of the screw press, according to whether the moisture content of the discharge material meets the standard, so that it can be fine-tuned in place at one time.

Claims

1. An automatic adjustment device for the gap between the discharge port and the pressure plate of a screw press, comprising a motor reducer (1) mounted on a steel plate (7), in a structural space between the motor reducer (1) and a spirally connected transmission shaft (2) as well as a discharge port (3) and a pressure plate (4), wherein: The annular elastic body (5) in the connection space between the outer feeding port (3) of the transmission shaft (2) and the motor reducer (1) has an inner diameter greater than the diameter of the transmission shaft (2) and an outer diameter less than the outer diameter of the feeding port pressure plate (4). One end of the elastic body (5) is pressed on the feeding port pressure plate (4) and the other end is supported on the supporting steel plate (6) of the annular elastic body (5). The supporting steel plate (6) is fixed to the mounting steel plate (7) of the motor reducer (1) by bolts (8). The distance between the supporting steel plate (6) of the annular elastic body (5) and the mounting steel plate (7) of the motor reducer (1) can be adjusted by the bolts (8) to achieve the setting pressure adjustment of the feeding port pressure plate (4) by the elastic body (5).

2. According to claim 1, the automatic adjustment device for the gap between the pressure plates at the outlet of a screw press is characterized by: The annular elastic body (5) is specifically a steel spring.

3. According to claim 1, the automatic adjustment device for the gap between the pressure plates at the outlet of a screw press is characterized by: The annular elastic body (5) is specifically an annular rubber airbag spring.

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