Screw shaft and press master with backpressure structure
By setting variable diameter and variable pitch spiral blades and a back pressure structure on the spiral shaft, the output slurry concentration of the spiral slurry press can be adjusted, which solves the problem of fixed slurry concentration in the existing technology and improves the extrusion performance and washing efficiency of the equipment.
Patent Information
- Application Number
- CN202423313360.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing spiral pulping machines cannot adjust the pulp concentration in real time, resulting in a fixed concentration that cannot adapt to the needs of different processes and sections.
Design a slurry extruder with a spiral shaft and back pressure structure. By setting variable diameter and pitch spiral blades, an inner cone tube for liquid discharge, and a pressure ring on the shaft, combined with telescopic power components, the slurry can be adjusted and extruded in real time to change the slurry concentration.
It enables flexible adjustment of pulp concentration, improves filtration and extrusion efficiency, increases compression ratio, enhances washing efficiency and black liquor extraction rate, and features high equipment reliability and simple operation.
Smart Images
Figure CN223607633U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of pulp squeezing machine, specifically relates to a spiral shaft and the pulp squeezing machine with back pressure structure. BACKGROUND
[0002] The conventional spiral pulp squeezing machine is composed of a base, a transmission assembly, a screen frame device, a discharge bin and a main shaft screw. Power is transmitted to the spiral main shaft through a motor via a speed reducer. The spiral main shaft rotates to push the pulp forward through the spiral blades. The pulp is pushed forward by the spiral blades, and the spiral blades distributed on the main shaft have a certain compression ratio. Under the extrusion of the spiral blades, the pulp is continuously dewatered and transported to the pulp outlet for discharge. The water squeezed out of the pulp passes through the filter drum into the water collecting tank and flows out from the white water outlet.
[0003] The pulp concentration of the spiral pulp squeezing machine is fixed and cannot be adjusted in real time. UTILITY MODEL CONTENTS
[0004] The utility model discloses a spiral shaft and the pulp squeezing machine with back pressure structure, which can adjust the pulp concentration in real time.
[0005] The utility model discloses the technical scheme that adopts:
[0006] A spiral shaft, comprising a hollow shaft body, a variable-diameter variable-pitch spiral blade is arranged on the shaft body, and a liquid outlet inner conical pipe structure is arranged at the discharge end of the shaft body. The liquid outlet inner conical pipe structure comprises a shaft screen, an inner conical pipe, a baffle I and a baffle II. The inner conical pipe, the baffle I and the baffle II are arranged in the inner cavity of the shaft body. The inner conical pipe is located between the baffle I and the baffle II. The baffle I and the baffle II are fixed to the inner cavity wall of the shaft body. An outlet cavity is formed between the outer wall of the inner conical pipe, the baffle I, the baffle II and the inner cavity wall of the shaft body. The shaft screen is arranged on the cavity wall of the shaft body and communicates with the outlet cavity. An outlet passage is arranged on the baffle II. In order to adjust the pulp concentration, the spiral shaft is improved. After the improvement, the squeezed black liquor can enter the shaft body through the shaft screen and then be discharged.
[0007] As a preferred scheme of the utility model, a reinforcing rib plate is arranged between the inner conical pipe and the inner cavity of the shaft body.
[0008] As a preferred scheme of the utility model, a pulp dispersing element is arranged on the outer wall of the shaft body. When in use, the pulp dispersing element can disperse the pulp entering the discharge bin.
[0009] The utility model also provides a kind of extruding machine with back pressure structure, including the spiral shaft, discharge bin and back pressure structure of above, the back pressure structure includes compression ring and telescopic power component, the end of spiral shaft setting inner taper pipe passes through the discharge bin setting, and gap is reserved between shaft screen and the feed inlet of discharge bin;Compression ring is sleeved on shaft body and is close to or away from the discharge bin wall of shaft screen under the driving of telescopic power component, and the telescopic part of telescopic power component is fixedly connected with compression ring by being inserted into discharge bin;Compression ring and discharge bin wall form material plug, and discharge pipe is provided in discharge bin, and discharge channel and discharge pipe are communicated.The movability of compression ring can extrude slurry entering discharge bin, change the concentration of slurry, and the extruded black liquor enters into discharge cavity from shaft screen, then enters into discharge pipe from the discharge channel of baffle II and is discharged, and the extruded slurry enters into discharge bin and is discharged from discharge port.
[0010] As a preferred scheme of the utility model, the position between shaft screen and compression ring on shaft body is provided with slurry dispersing element.
[0011] As a preferred scheme of the utility model, the spiral shaft is installed in the shell, the shell is provided with pulp inlet and discharge port, and sieve drum is installed between spiral shaft and shell.
[0012] The utility model is provided with back pressure structure at discharge position, and the compression ring of back pressure structure can move along shaft body and extrude slurry between discharge bin wall and compression ring, and the extruded black liquor needs to be discharged, so the structure of spiral shaft needs to be changed, shaft screen is arranged at the discharge end of spiral shaft, black liquor enters into discharge cavity from shaft screen, then is discharged into discharge pipe from the discharge channel of discharge cavity, the extrusion force of compression ring can realize the adjustment of pulp concentration, and combined with the three-section extrusion of spiral shaft itself, different processes and sections can be applied, and the filtering and extrusion efficiency is more prominent than that of traditional spiral blade, with larger compression ratio, higher washing efficiency, more stable discharge concentration, higher black liquor extraction rate, reliable equipment operation, simple operation and other advantages. ACCURACY
[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.
[0014] Figure 1 It is the structural schematic diagram of the utility model extruding machine.
[0015] Figure 2 It is the structural schematic diagram of the utility model spiral shaft.
[0016] Figure 3 It is a structure diagram of the liquid outlet inner cone pipe structure of the shaft body of the utility model.
[0017] Figure 4 It is a structure diagram of the back pressure structure of the utility model. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.
[0019] Embodiment 1
[0020] A spiral shaft, as shown in Figure 2 and 3 , comprises a hollow shaft body 1, both ends of the shaft body are provided with shaft heads, variable-pitch variable-diameter spiral blades 2 are arranged on the shaft body 1, and the pitch and the blade diameter gradually decrease from the power input end to the slurry output end.
[0021] In order to realize the adjustment of the slurry concentration, the spiral shaft is improved correspondingly, and after the improvement, the squeezed black liquor can enter the shaft body from the shaft screen and then be discharged, specifically, a liquid outlet inner cone pipe structure is arranged at the discharge end of the shaft body 1, the liquid outlet inner cone pipe structure comprises a shaft screen 3, an inner cone pipe 4, a baffle I 5 and a baffle II 6, the inner cone pipe 4, the baffle I 5 and the baffle II 6 are arranged in the inner cavity of the shaft body, the inner cone pipe 4 is located between the baffle I 5 and the baffle II 6, the baffle I 5 and the baffle II 6 are fixed with the inner cavity wall of the shaft body, the outer wall of the inner cone pipe, the baffle I, the baffle II and the inner cavity wall of the shaft body form a liquid outlet cavity, the shaft screen 3 is arranged on the cavity wall of the shaft body and communicates with the liquid outlet cavity, and the baffle II is provided with a liquid outlet passage 17.
[0022] In order to bear a very large pressure during extrusion and to improve the strength, a reinforcing rib plate 7 is arranged between the inner cone pipe and the inner cavity of the shaft body, and the reinforcing rib plate is located close to the shaft screen.
[0023] And a slurry dispersing piece 8 is arranged on the outer wall of the shaft body, which can scatter the slurry entering the discharge bin during use.
[0024] Embodiment 2
[0025] An extrusion machine provided with a back pressure structure, as shown in Figure 1 , comprises the spiral shaft, the discharge bin 9 and the back pressure structure in embodiment 1, and the spiral shaft is installed in a machine shell 13, the machine shell 13 is provided with a slurry inlet 14 and a liquid outlet 15, and a screen drum 16 is installed between the spiral shaft and the machine shell.
[0026] The back pressure structure comprises a pressure ring 10 and a telescopic power element 11, as shown in the figure. Figure 4 As shown in the figure, the end of the inner tapered tube provided with the screw shaft passes through the discharge bin, so that the shaft screen is located below the feeding port, and a gap is reserved between the shaft screen and the feeding port of the discharge bin; the pressure ring 10 is sleeved on the shaft body and is driven by the telescopic power element to approach or move away from the bin wall of the discharge bin at the position of the shaft screen; the pressure ring 10 and the bin wall of the discharge bin form a material plug, and a liquid outlet pipe 12 is arranged in the discharge bin, and the liquid outlet channel and the liquid outlet pipe are communicated.
[0027] The pressure ring 10 is provided with two lugs, and the piston rod of a cylinder is connected to each lug, and the cylinder body is fixed to the outer wall of the discharge bin.
[0028] A pulp dispersing element 8 is arranged on the shaft body between the shaft screen and the pressure ring.
[0029] The pulp enters the casing through the pulp inlet, is extruded by the screw variable-diameter variable-pitch, and the volume of the pulp becomes smaller and smaller, the extruded black liquor is filtered through the screen drum and flows to the position below the casing and is discharged from the liquid outlet 15, the pulp at the discharge end enters the position of the discharge bin from the gap between the shaft screen and the discharge port, is extruded by the pressure ring to adjust the concentration of the discharged pulp, and the change of the concentration of the discharged pulp is realized by changing the pressure of the cylinder, the extruded black liquor enters the liquid outlet cavity from the shaft screen, realizes the consistency of the pulp in and outside the discharge bin, then enters the liquid outlet channel of the baffle II and is discharged from the liquid outlet pipe, and the extruded pulp enters the discharge bin and is discharged from the discharge port.
[0030] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0031] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.
Claims
1. A helical shaft comprising a hollow shaft body (1) on which there are provided helical blades (2) of variable pitch and variable diameter, characterized in that: The liquid outlet inner taper pipe structure is arranged at the discharge end of the shaft body (1), and comprises a shaft screen (3), an inner taper pipe (4), a baffle I (5) and a baffle II (6). The inner taper pipe (4), the baffle I (5) and the baffle II (6) are arranged in the inner cavity of the shaft body, the inner taper pipe (4) is located between the baffle I (5) and the baffle II (6), the baffle I (5) and the baffle II (6) are fixed with the inner cavity wall of the shaft body, the outer wall of the inner taper pipe, the baffle I, the baffle II and the inner cavity wall of the shaft body form a liquid outlet cavity, the shaft screen (3) is arranged on the cavity wall of the shaft body and communicates with the liquid outlet cavity, and the baffle II is provided with a liquid outlet channel.
2. The helical shaft of claim 1, wherein: A reinforcing rib plate (7) is arranged between the inner taper pipe and the inner cavity of the shaft body.
3. A helical shaft according to claim 1 or 2, characterised in that: A pulp dispersing member (8) is arranged on the outer wall of the shaft body.
4. A pulp press provided with a back pressure structure, characterized in that: The screw shaft, a discharge bin (9) and a back pressure structure are arranged, the back pressure structure comprises a pressure ring (10) and a telescopic power member (11), the end of the screw shaft provided with the inner taper pipe passes through the discharge bin, a gap is reserved between the shaft screen and the feeding port of the discharge bin, the pressure ring (10) is sleeved on the shaft body and is driven by the telescopic power member to approach or move away from the bin wall of the discharge bin at the position of the shaft screen, the telescopic part of the telescopic power member is inserted into the discharge bin and is fixedly connected with the pressure ring, the pressure ring (10) and the bin wall of the discharge bin form a material plug, a liquid outlet pipe (12) is arranged in the discharge bin, and the liquid outlet channel and the liquid outlet pipe communicate.
5. The extruder with back pressure arrangement as claimed in claim 4 wherein: A pulp dispersing member (8) is arranged on the shaft body at the position between the shaft screen and the pressure ring.
6. The extruder with back pressure arrangement as claimed in claim 4 or 5 wherein: The screw shaft is installed in a machine shell (13), the machine shell (13) is provided with a pulp inlet (14) and a liquid outlet (15), and a screen drum (16) is arranged between the screw shaft and the machine shell.