CN216914941U

CN216914941U - Screw shaft structure and screw squeezing dehydrator for culture dehydration equipment

Info

Publication number: CN216914941U
Application number: CN202122682047.9U
Authority: CN
Inventors: 孙刚范; 张文彬; 孙启秀; 刘道广
Original assignee: Shanghai Techase Environment Protection Co ltd
Current assignee: Shanghai Techase Environment Protection Co ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-07-08
Anticipated expiration: 2031-11-04

Abstract

The utility model discloses a spiral shaft structure and a spiral squeezing dehydrator for culture dehydration equipment. The screw shaft adopts a structure of a double-helix propulsion shaft and an intermittent shaft: the conveying section adopts a double-head continuous spiral, and the spiral blades of the double-head continuous spiral are two whole continuous spiral blades which are arranged in a mirror symmetry mode by taking the shaft as the center; the dewatering section adopts discontinuous screw, namely broken tooth screw, the screw blades of the discontinuous screw are in one-piece two-in-one group discontinuous arrangement, and the two screw blades of each group are in mirror symmetry by taking the shaft as the center; the dewatering section of the spiral shaft comprises a spiral section provided with spiral blades and a discontinuous part without the spiral blades; the front end fracture of each helical blade of each broken tooth helical group is provided with a sharp cutting edge, so that long fiber objects can be effectively cut off. The screw shaft is low in processing cost and simple in processing, and can be used for timely adjusting the phenomenon of uneven concentration. The screw press dehydrator can improve the dehydration performance, effectively reduce the water content of the discharged mud and is not easy to block the shaft.

Description

Screw shaft structure and screw squeezing dehydrator for culture dehydration equipment

Technical Field

The utility model belongs to the technical field of sewage treatment, and relates to a spiral shaft structure and a spiral squeezing dehydrator for culture dehydration equipment.

Background

In recent years, with rapid rise and rapid development of intensive and large-scale livestock and poultry breeding, the breeding scale is continuously enlarged, the production amount of breeding wastes such as livestock and poultry manure and sewage is rapidly increased, the environmental load pressure is increased, and the breeding pollution and environmental protection problems caused by livestock and poultry breeding sewage (wastewater) are increasingly severe. The daily BOD (Biochemical oxygen demand) of the feces of adult pigs was determined to be 13 times that of human feces. The breeding sewage (waste water) generated by pig farms becomes or is becoming a pollution source which is equivalent to or larger than industrial waste water and domestic sewage, and if the breeding sewage and the domestic sewage are not treated properly, the breeding sewage and the waste water can bring great threat to environmental protection.

The culture sewage (sludge) has the characteristic of uneven concentration (thin and viscous). The sewage (sludge) of the breeding industry is accompanied by more long fiber materials (excrement), fine particulate matters (such as excrement, feed and the like) and other impurities. The existing screw shaft used on the squeezing and dewatering equipment for treating the aquaculture sewage in the current market has the defects of high processing difficulty, unstable water content of discharged mud, easiness in shaft blockage, incapability of timely adjusting aiming at the phenomenon of uneven feed concentration, reduction of solid-liquid separation performance (dewatering performance) caused by uneven fecal sewage concentration and the like.

The screw shaft structure used on the existing culture dewatering equipment mainly has the following problems to be solved:

(1) the traditional screw shaft blade is difficult to process, and the welding workload is large;

(2) due to uneven concentration of the excrement at the front end, the equipment cannot be adaptively adjusted in time, so that the water content of the discharged mud is unstable;

(3) the breeding sludge contains more long fiber materials which are easy to wind around the helical blades, so that the blockage and the blockage in the dehydration cavity are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, and provides a screw shaft structure and a screw squeezing dehydrator for aquaculture dehydration equipment, which have small processing difficulty, are difficult to block a shaft and can timely adjust materials with uneven concentration, aiming at the defects that the screw shaft used in the existing aquaculture dehydration equipment has large processing difficulty, unstable mud water content, is easy to block the shaft, cannot timely adjust the phenomenon of uneven concentration, can cause the reduction of solid-liquid separation performance due to uneven concentration of excrement and the like.

The technical scheme of the utility model is as follows:

the utility model relates to a screw shaft (also called screw pressing conveying shaft or screw pressing screw shaft) structure used on culture dewatering equipment, which adopts a structure of a double-screw propelling shaft (conveying section) and an intermittent shaft (extruding section): the spiral shaft comprises shaft heads at two ends and a shaft with a long middle part, and the shaft with the long middle part is divided into a conveying section and a dewatering section; the conveying section adopts a double-head continuous spiral, and the spiral blades of the double-head continuous spiral are two whole continuous spiral blades which are arranged in a mirror symmetry mode by taking the shaft as the center; the dewatering section adopts an interrupted screw (also called a broken tooth screw), the screw blades of the interrupted screw are in a single-piece type, two screw blades are arranged in a group of two screw blades in a discontinuous way, and the two screw blades of each group are arranged in a mirror symmetry way by taking the shaft as the center; that is, the dewatering section of the screw shaft includes a screw section provided with a screw blade and a discontinuity (a discontinuity is provided between two adjacent screw sections) where no screw blade is provided; each spiral blade of each broken tooth spiral group has a front fracture and a rear fracture (namely a front end part and a rear end part); the front end (front feeding end) of each helical blade of each broken-tooth helical group is provided with a sharp cutting edge at the broken part.

Furthermore, the shaft of the spiral shaft and the double-head continuous spiral and the broken-tooth spiral on the shaft are made of stainless steel materials.

Further, two whole continuous helical blades of the double-head continuous helix of the conveying section are welded and fixed on the shaft.

Furthermore, two spiral blades of each group of the broken tooth spiral of the dewatering section are welded and fixed on the shaft.

The utility model relates to a screw squeezing dehydrator adopting the screw shaft structure and used for the breeding industry, which comprises a screw shaft used on the breeding dehydration equipment, a screw squeezing dehydration speed reduction motor, a back pressure spring, a back pressure conical head, a conveying section sieve barrel, a dehydration section sieve barrel, a feeding hose, an overflow hose and a feeding connecting plate, wherein the screw pressing dehydration speed reduction motor is connected with the screw shaft; the conveying section sieve barrel and the dewatering section sieve barrel are arranged on the frame and are sequentially arranged at the front and rear positions in the middle of the spiral squeezing dewatering body; the upper end of the front part of the screen barrel of the conveying section is provided with a feed inlet, and the lower part of the tail end of the screen barrel of the dewatering section is provided with a sludge outlet; two ends of the spiral shaft are arranged on bearing seats through bearings, and the bearing seats are arranged on the rack; the conveying section and the dewatering section of the spiral shaft are respectively positioned on the central axis in the conveying section sieve barrel and the dewatering section sieve barrel; the tail end of the screw shaft is connected with a screw pressure dehydration speed reducing motor, and a spring top plate, a back pressure spring and a back pressure conical head are sequentially arranged close to the inner side; the spring top plate is fixed on the frame, and the back pressure conical head is connected with the back pressure spring; the feeding connecting plate is fixedly arranged at the front end of the spiral squeezing dehydrator; a mud inlet is arranged on the feeding connecting plate; the feed inlet at the upper end of the front part of the screen barrel at the conveying section is connected with a sludge inlet on the feed connecting plate through a feed hose.

Furthermore, an overflow port is also arranged on the feeding connecting plate; an overflow port below a feed port at the upper end of the front part of the conveying section sieve barrel is connected with an overflow port on the feed connecting plate through an overflow hose; the overflow hose is arranged below the feeding hose.

Furthermore, the inner wall of the screen barrel of the dewatering section is provided with convex teeth which are just embedded into the discontinuous part of the discontinuous spiral, so that the blockage caused by the accumulation of materials at the discontinuous part of the spiral blade is prevented.

Furthermore, the filtering precision of the screen meshes of the dewatering section screen barrel and the conveying section screen barrel, namely the aperture size of the screen meshes is 0.5-0.75 mm.

The utility model has the beneficial effects that:

the spiral shaft structure used on the cultivation dehydration equipment is developed by combining the experience of company sludge treatment equipment and aiming at the condition of uneven fecal sewage concentration in the cultivation industry on the basis of a common spiral shaft popular in the market aiming at the defects of high processing cost, high processing difficulty, unstable sludge water content, easy shaft blockage and the like of the spiral shaft on the existing cultivation dehydration equipment in the market. Compared with the prior screw shaft structure, the screw shaft structure has the advantages of low processing cost, simple processing, capability of timely adjusting the phenomenon of uneven concentration, capability of improving the dehydration performance, effectively reducing the water content of the discharged mud, difficulty in shaft blockage and the like.

The spiral shaft structure and the spiral squeezing dehydrator for the culture dehydration equipment adopt a structure of a double-spiral propelling shaft and an intermittent shaft, and have the following advantages:

(1) the quantity of the blades of the screw intermittent shaft is less than that of the screw shaft with a standard structure, so that the welding workload is less and the cost is lower;

(2) aiming at the condition of uneven concentration of the excrement, the spiral intermittent shaft can adjust the state of the sludge in the dewatering body through a special structure (existence of an intermittent part) of the intermittent shaft part, reduce the water content of the discharged sludge and keep the water content of the discharged sludge stable;

(3) aiming at the phenomenon that materials are easily wound around the helical blades, the screw intermittent shaft is optimally designed at the position of the break of the feed end of each intermittent blade, the front end break of each helical blade of each broken-tooth screw group is provided with a sharp cutting edge, the cutting function is realized, long fiber objects and other impurities can be effectively cut off when the screw shaft rotates, the phenomenon that the screw shaft is blocked and jammed can be prevented, large particles and long fiber objects can be quickly filtered, and the capacity of equipment is effectively improved.

Drawings

FIG. 1 is a schematic structural diagram of a screw shaft structure used in a cultivation dewatering device according to the present invention;

fig. 2 is a schematic structural view of a screw press dehydrator for use in the farming industry in the present invention.

In the figure: 1. a shaft; 2. a shaft head; 11. an intermittent part; 12. a blade; 13. double-end continuous spiral; 13a, 13b, double-ended continuous helical blades; 14. the broken teeth are spiral; 14a, 14b, a broken tooth helical blade; 15. a convex tooth; A. a conveying section; B. a dewatering section; G. the material advancing direction;

21. a screw-pressing dehydration speed-reducing motor; 22. a spring top plate; 23. a back pressure spring; 24. a back pressure cone head; 25. a dewatering section screen barrel; 26. a conveying section screening barrel; 27. a feed hose; 28. a feeding connecting plate; 29. screwing the screw shaft; 30. an overflow hose.

Detailed Description

The utility model is further described below with reference to the following figures and examples.

Examples

As shown in fig. 1, the present invention relates to a screw shaft structure for a cultivation dewatering device (screw press dewatering machine), which adopts a structure of a double screw propulsion shaft (conveying section) and an intermittent shaft (squeezing section): the screw shaft comprises shaft heads 2 at two ends and a long shaft 1 in the middle, wherein the long shaft 1 in the middle is divided into a conveying section A and a dewatering section B; the conveying section A adopts a double-head continuous screw 13, and the helical blades of the double-head continuous screw 13 are two whole continuous helical blades (namely double-head continuous

helical blades

13a and 13b) which are arranged in a mirror symmetry mode by taking a shaft as a center; the dewatering section B adopts an interrupted screw (also called a broken tooth screw 14), the screw blades of the interrupted screw (broken tooth screw 14) are in a single-piece type, two screw blades are arranged in a group of two screw blades in an interrupted manner, and the two screw blades (namely the broken tooth screw blades 14a and 14B) in each group are arranged in a mirror symmetry manner by taking the shaft as the center; that is, the dewatering section B of the screw shaft includes a screw section provided with screw blades and a discontinuity 11 provided with no screw blade (a discontinuity 11 is provided between adjacent two screw sections). Each helical blade of each group of the broken-tooth helix 14 has two front and back fractures (i.e. two front and back ends). The front end (front feed end) of each helical blade (i.e. the broken-tooth

helical blades

14a, 14b) of each set of the broken-tooth helix 14 is provided with a sharp cutting edge 12 at the break.

The shaft 1 of the spiral shaft, the double-head continuous spiral 13 on the shaft 1 and the broken-tooth spiral 14 are made of stainless steel. Two whole continuous helical blades (i.e. the double-head continuous

helical blades

13a and 13b) of the double-head continuous screw 13 of the conveying section a are welded and fixed on the shaft. Two spiral blades (namely broken-tooth spiral blades 14a and 14B) of each group of the broken-tooth spiral 14 of the dewatering section B are welded and fixed on the shaft.

The screw shaft (screw pressing screw shaft 29) used on the culture dewatering equipment has the following structural design and advantages:

(1) the screw-pressing screw shaft 29 adopts a structure of a double-screw propulsion shaft (conveying section) and an intermittent shaft (extrusion section): the screw pressing screw shaft 29 comprises shaft heads 2 at two ends and a shaft 1 with a long middle part, wherein the shaft 1 with the long middle part is divided into a conveying section A and a dewatering section B; the conveying section A adopts a double-head continuous screw 13, and the helical blades of the double-head continuous screw 13 are two whole continuous helical blades (namely double-head continuous

helical blades

13a and 13b) which are arranged in a mirror symmetry mode by taking a shaft as a center; the dewatering section B (extrusion section) adopts an interrupted screw (also called a broken tooth screw 14), the screw blades of the interrupted screw (broken tooth screw 14) are in a single-piece type, two screw blades are arranged in a group of two screw blades in an interrupted manner, and the two screw blades (namely the broken tooth screw blades 14a and 14B) in each group are arranged in a mirror symmetry manner by taking the shaft as the center; that is, the dewatering section B of the screw shaft 29 includes a screw section provided with screw blades and a break 11 provided with no screw blade (there is a break 11 between two adjacent screw sections); as shown in fig. 1 and 2, the material enters the conveying section sieve barrel 26 from the right side mud inlet, and under the spiral propelling action of the double-head continuous spiral 13, the material is continuously pushed forward along the material advancing direction G shown in fig. 1, and when reaching the break 11 of the broken tooth spiral 14 in the dewatering section sieve barrel 25, the break 11 has no spiral surface (no spiral blade), so that the material is stacked at the break 11, and until the material is stacked to a certain extent, the material is continuously pushed to the next spiral section (the place on the spiral shaft 29 of the dewatering section B, where the spiral blade is provided) until sufficient pressure is formed. Due to the existence of the intermittent part 11, the intermittent screw (the broken tooth screw 14) has higher working rotating speed and can adapt to the change of the feeding speed and the change of the feeding concentration, and the advantage has important significance for overcoming the reduction of the separation performance caused by the uneven concentration of the excrement; that is to say, aiming at the condition of uneven concentration of the excrement, the spiral intermittent shaft can adjust the state of the sludge in the dewatering body through the special structure (existence of the intermittent part 11) of the intermittent shaft part, reduce the water content of the discharged sludge and keep the water content of the discharged sludge stable; on the other hand, the interrupted screw (broken tooth screw 14) is able to handle thick and other difficult to handle materials.

(2) The dewatering section B (the squeezing section) employs an interrupted screw, which is also called a broken tooth screw 14 because its screw blades are set (one section by one section) separately (intermittently) in a single-piece, interrupted set; every helical blade of 14 every groups of broken tooth spiral all has two fractures (two tip around promptly), and the material gathers at the department of being interrupted 11 between the rear end fracture of preceding helical blade and the front end fracture of following helical blade and forms "soft extrusion" district, can impel the material to carry forward when only squeezing each other between the material and reaching sufficient pressure, therefore has promoted its dewatering effect greatly. However, such a structure also makes long fiber objects, coarse fiber objects or other impurities easily hang on the fracture of the helical blade and the discontinuous part 11, and the material is difficult to discharge or cannot be discharged after being continuously enriched. The broken tooth screw 14 is optimally designed at the feed end fracture of each screw blade, the front feed end fracture of each screw blade (namely the broken

tooth screw blades

14a and 14b) of each group of the broken tooth screw 14 is provided with a sharp cutting edge 12, the cutting function is realized, and long fibers and other impurities can be effectively cut off by the sharp cutting edge 12 (notch) when the cutting edge rotates, so that the machine is prevented from being blocked.

(3) The conveying section A adopts a double-head continuous screw 13 to improve the effective compression area and the axial conveying capacity, and the purpose of quick discharging is achieved.

Fig. 2 shows a screw press dehydrator for breeding industry using the screw shaft structure, which comprises a screw shaft (i.e. a screw press screw shaft 29) used on the breeding dehydration equipment, a screw press dehydration speed reduction motor 21, a spring top plate 22, a backpressure spring 23, a backpressure cone head 24, a dehydration section sieve barrel 25, a conveying section sieve barrel 26, a feeding hose 27, an overflow hose 30 and a feeding connecting plate 28; the conveying section sieve barrel 26 and the dewatering section sieve barrel 25 are arranged on the frame and are sequentially arranged in the front and rear positions in the middle of the spiral squeezing dewatering body 2; two ends of the screw pressing screw shaft 29 are arranged on a bearing seat through a bearing, and the bearing seat is arranged on the rack; the conveying section A and the dewatering section B of the screw pressing screw shaft 29 are respectively positioned on the central axis in the conveying section sieve barrel 26 and the dewatering section sieve barrel 25; the upper end of the front part of the conveying section sieve barrel 26 is provided with a feeding hole, and the lower part of the tail end of the dewatering section sieve barrel 25 is provided with a sludge outlet; the tail end of the screw pressing screw shaft 29 is connected with a screw pressing dehydration speed reducing motor 21 at the outermost end, and a spring top plate 22, a back pressure spring 23 and a back pressure conical head 24 are sequentially arranged close to the inner side; the spring top plate 22 is fixed on the frame; the back pressure conical head 24 is connected with a back pressure spring 23 and can slide on a screw pressure screw shaft 29; the feeding connecting plate 28 is fixedly arranged at the front end of the screw press dehydrator, and is provided with an upper flange port and a lower flange port, wherein the upper part is a sludge inlet, and the lower part is an overflow port; the feeding port at the upper end of the front part of the conveying section screen barrel 26 is connected with a mud feeding port on a feeding connecting plate 28 through a feeding hose 27. An overflow port below a feed port at the upper end of the front part of the conveying section sieve barrel 26 is connected with an overflow port on a feed connecting plate 28 through an overflow hose 30; the overflow hose 30 is provided below the feed hose 27. The inner wall of the screen barrel 25 of the dewatering section is provided with convex teeth 15, the convex teeth 15 are just embedded into the discontinuous part 11 of the discontinuous spiral (the broken-tooth spiral 14), and the convex teeth 15 are used for preventing materials from being accumulated at the discontinuous part of the spiral blade to cause blockage. The filtering precision of the screen mesh of the dewatering section screen bucket 25 and the conveying section screen bucket 26, namely the aperture size of the screen mesh is 0.5-0.75 mm.

The working principle of the spiral squeezing dehydrator is as follows: the aquaculture wastewater sequentially enters the conveying section sieve barrel 26 and the dewatering section sieve barrel 25 through a flange opening (sludge inlet) on the feeding connecting plate 28, under the action of the spring top plate 22, the backpressure spring 23 and the backpressure conical head 24, pressure is formed between the dewatering section sieve barrel 25 and the conveying section sieve barrel 26 and the screw pressing spiral shaft 29, filtrate is extruded out from gaps (sieve holes) on the surface of the sieve barrel through the pressure, and filter residues are conveyed to a sludge outlet through the screw pressing conveying shaft (screw pressing spiral shaft 29).

The screw pressing screw shaft 29 of the screw pressing dehydrator adopts a structure of double screw propulsion (conveying section) and a discontinuous shaft (extruding section), can treat breeding wastewater with uneven fecal sewage concentration, adjusts the state of sludge in the dehydrating body through a special structure (existence of discontinuous part) of the discontinuous shaft part of the screw, reduces the water content of discharged sludge, and keeps the water content of the discharged sludge stable; meanwhile, the sharp cutting edge at the front end of the spiral blade of the broken-tooth spiral can effectively cut off long fibers and other sundries, can prevent the spiral shaft from being blocked and stuck, and effectively improves the capacity of equipment.

Claims

1. The utility model provides a screw axis structure of using on breed dewatering equipment which characterized in that, it adopts the structure of double helix propulsion shaft with intermittent type axle: the spiral shaft comprises shaft heads at two ends and a shaft with a long middle part, and the shaft with the long middle part is divided into a conveying section and a dewatering section; the conveying section adopts a double-head continuous spiral, and the spiral blades of the double-head continuous spiral are two whole continuous spiral blades which are arranged in a mirror symmetry mode by taking the shaft as the center; the dewatering section adopts an interrupted screw, also called a broken tooth screw, the screw blades of the interrupted screw are in a single-piece type, two screw blades are arranged in a group, and the two screw blades of each group are arranged in a mirror symmetry mode by taking the shaft as the center; that is, the dewatering section of the screw shaft includes a screw section provided with screw blades and a discontinuity where the screw blades are not provided; each helical blade of each broken tooth helical group has a front fracture and a rear fracture; the front end fracture of each helical blade of each broken tooth helical group is provided with a sharp cutting edge.

2. The screw shaft structure for use in aquaculture dewatering equipment of claim 1, wherein the shaft of said screw shaft and the double-ended continuous screw and the broken-tooth screw on the shaft are made of stainless steel.

3. A screw shaft structure for use in a dewatering apparatus for farm animals according to claim 1 or 2, wherein two continuous screw blades of the conveying section double-ended continuous screw are welded and fixed to the shaft.

4. The screw shaft structure for use in aquaculture dewatering equipment as recited in claim 1 or 2, wherein the two screw blades of each set of the broken-tooth screw of the dewatering section are welded and fixed to the shaft.

5. A screw press dehydrator for the breeding industry, which adopts the screw shaft structure as claimed in any one of claims 1 to 4, and is characterized by comprising the screw shaft as claimed in any one of claims 1 to 4, a screw press dehydration speed reduction motor, a back pressure spring, a back pressure conical head, a conveying section sieve barrel, a dehydrating section sieve barrel, a feeding hose, an overflow hose and a feeding connecting plate; the conveying section sieve barrel and the dewatering section sieve barrel are arranged on the frame and are sequentially arranged at the front and rear positions in the middle of the spiral squeezing dewatering body; the upper end of the front part of the screen barrel of the conveying section is provided with a feed inlet, and the lower part of the tail end of the screen barrel of the dewatering section is provided with a sludge outlet; two ends of the spiral shaft are arranged on bearing seats through bearings, and the bearing seats are arranged on the rack; the conveying section and the dewatering section of the spiral shaft are respectively positioned on the central axis in the conveying section sieve barrel and the dewatering section sieve barrel; the tail end of the screw shaft is connected with a screw pressure dehydration speed reducing motor, and a spring top plate, a back pressure spring and a back pressure conical head are sequentially arranged close to the inner side; the spring top plate is fixed on the frame, and the back pressure conical head is connected with the back pressure spring; the feeding connecting plate is fixedly arranged at the front end of the spiral squeezing dehydrator; a mud inlet is arranged on the feeding connecting plate; the feed inlet at the upper end of the front part of the screen barrel at the conveying section is connected with a sludge inlet on the feed connecting plate through a feed hose.

6. The screw press dehydrator for use in aquaculture of claim 5, wherein the feeding connection plate is further provided with an overflow port; an overflow port below a feed port at the upper end of the front part of the conveying section sieve barrel is connected with an overflow port on the feed connecting plate through an overflow hose; the overflow hose is arranged below the feeding hose.

7. The screw press dehydrator for farming industry of claim 5 or 6 wherein the inner wall of the screen barrel of the dehydrating section is provided with convex teeth which are just embedded in the intermittent part of the intermittent screw.

8. The screw press dehydrator for use in aquaculture as claimed in claim 5 or 6, wherein the screen mesh of the screen barrel of the dehydrating section and the screen barrel of the conveying section has a filtering precision, i.e. the aperture size of the screen mesh is 0.5-0.75 mm.