Novel backpressure device of screw press

Abstract

The novel backpressure device comprises a backpressure disc, a spiral shaft connecting unit and a backpressure disc abutting unit, the spiral shaft connecting unit comprises a hoop arranged on the back face of the backpressure disc, a plurality of clamping grooves are formed in the circumferential outer wall of the hoop, rotating shafts capable of sliding in the axial direction of the hoop are embedded in the clamping grooves in a clamped mode, and the rotating shafts abut against the backpressure disc abutting unit. The heads of the rotating shafts are fixed to the back face of the back pressure disc. The back pressure plate abutting unit comprises a Y-shaped connector arranged on the back face of the back pressure plate, a bearing is rotationally connected between lug plates of the Y-shaped connector, and the bearing abuts against the back face of the back pressure plate. And the tail ends of the Y-shaped joints are connected with reciprocating linear driving units capable of driving the Y-shaped joints to reciprocate along the axial direction of the back pressure plate. The back pressure plate has the advantages that the equipment operation stability is realized; the discharging efficiency and the dewatering efficiency of the materials are high, and the device can be suitable for different paper pulp types; during axial displacement of the back pressure plate, the abrasion is small, and the service life is long; and the backpressure plate and the discharge port are not easy to block.

Description

Technical Field

[0001] The utility model relates to the technical field of screw presses, in particular to a novel back pressure device for a screw press. Background Technique

[0002] The pulp screw press plays a crucial role in the pulp production process, especially in the solid-liquid separation stage. The working principle of the pulp screw press is mainly based on the screw extrusion principle. During the pressing process, the material continuously moves forward under the push of the screw shaft and is subjected to gradually increasing pressure. Under the push of the screw shaft, the material enters the stuffing tube wave by wave and accumulates. The compactness of the material in the stuffing tube increases. At this time, the moisture or liquid part in the material is forced out and discharged through structures such as sieve holes; while the solid part continues to move forward. When the pressure in the stuffing tube is greater than the reverse pressure of the back pressure disc, the material will push open the back pressure disc and discharge from the gap between the back pressure disc and the stuffing tube. The material falls off from the gap to complete the extrusion and dehydration.

[0003] The patent publication number CN209305036U discloses a screw press with adjustable back pressure, including a frame, a spiral ribbon shaft, a screen cylinder, a back pressure head, a linear driver and a rotary driver; the back pressure head is connected to the screw shaft through a flat key, and the back pressure head is driven by a double-acting oil cylinder to move along its axial direction. The convex platform on the conical surface of the back pressure head is used to shear and disperse the material. However, since grooves need to be opened on the screw shaft and convex platforms are provided on the conical surface of the back pressure head, the integrity and strength of the screw shaft are weakened, the durability and reliability of the equipment cannot be guaranteed, and the balance of the screw shaft and the stability of the equipment operation are affected; when the back pressure disc axially displaces, its wear is large and the service life is short; it is easy to be blocked between the back pressure disc and the discharge port, and the discharge efficiency is low and other problems. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the existing defects, provide a novel back pressure device for a screw press, maintain the integrity and strength of the screw shaft, ensure the balance of the screw shaft and the stability of the equipment operation; the axial position of the back pressure disc is adjustable, the discharge efficiency and dehydration efficiency of the material are high, and it can be applicable to different types of pulp; when the back pressure disc axially displaces, its wear is small and the service life is long; it is not easy to be blocked between the back pressure disc and the discharge port; the structure is simple, the disassembly and assembly are convenient; the problems in the background technique can be effectively solved.

[0005] To achieve the above object, the present utility model provides the following technical solutions: a new back pressure device for a screw press, comprising a back pressure disc, a screw shaft connection unit, and a back pressure disc abutting unit. The screw shaft connection unit includes a hoop provided on the back surface of the back pressure disc. The hoop is coaxially arranged with the back pressure disc. A plurality of card slots are provided on the circumferential outer wall of the hoop. A rotating shaft that can slide along the axial direction of the hoop is embedded in each card slot. The heads of the rotating shafts are all fixed on the back surface of the back pressure disc. The back pressure disc abutting unit includes a Y-shaped joint provided on the back surface of the back pressure disc. A bearing is rotatably connected between the ear plates of the Y-shaped joint through a pin shaft. The bearing is a self-sealing ball bearing, and the bearing abuts against the back surface of the back pressure disc. The back pressure disc abutting units are all located outside the hoop, and the number of back pressure disc abutting units is not less than two. The ends of the Y-shaped joints are all connected to a reciprocating linear drive unit that can drive it to reciprocate along the axial direction of the back pressure disc.

[0006] Further, the reciprocating linear drive unit includes a connecting shaft fixedly connected to the Y-shaped joint. A guide sleeve is nested outside the connecting shaft. A telescopic cylinder is fixedly provided at the end of the guide sleeve. The telescopic end of the telescopic cylinder penetrates into the guide sleeve and is fixedly connected to the connecting shaft. A flange is provided on the circumferential outer wall of the guide sleeve.

[0007] Further, the telescopic cylinder is a cylinder, and the telescopic cylinder is fixedly connected to the flange through a stud and a nut.

[0008] Further, a lining ring is nested at the axial end faces of both ends of the bearing on the pin shaft. The ear plates of the Y-shaped joint press the bearing through the lining ring. A hose clamp is provided at the position of the pin shaft on the Y-shaped joint.

[0009] Further, the front end of the back pressure disc is a tapered ring. A ring adapted to its outer diameter is provided at the end of the tapered ring. An end plate is provided at the end of the ring. The end plate is a ring-shaped structure, and the bearings all abut against the back surface of the end plate. A dial is provided on the circumferential outer wall of the ring. The dial is an inverted L-shaped plate structure.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: The novel backpressure device of this screw press is synchronously rotationally connected to the screw shaft of the screw press through a hoop and a rotating shaft, maintaining the integrity and strength of the screw shaft, ensuring the balance of the screw shaft and the stability of the equipment operation; the backpressure disk can be moved along its axial direction by a reciprocating linear drive unit, and the axial position of the backpressure disk can be adjusted, improving the discharge efficiency and dehydration efficiency of the material, and being applicable to different types of pulp; the bearing is in rolling contact with the back of the backpressure disk, with small wear when the backpressure disk axially displaces and a long service life; and the bearing is rotationally connected to the Y-shaped joint through a pin shaft, improving the stability of the bearing rolling against the backpressure disk; the paddle is fixed on the ring of the backpressure disk, which can effectively prevent blockage at the discharge port between the discharge port and the conical ring, improve the discharge efficiency, and ensure that the pulp is dispersed during the discharging process; the backpressure device has a simple structure and is convenient for disassembly and assembly. Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the present utility model;

[0012] Figure 2 is an axonometric view of the backpressure device of the present utility model;

[0013] Figure 3 is a front view of the backpressure device of the present utility model;

[0014] Figure 4 is a schematic structural diagram of the backpressure disk of the present utility model;

[0015] Figure 5 is a schematic structural diagram of the screw shaft connection unit of the present utility model;

[0016] Figure 6 is a sectional view of the backpressure device of the present utility model;

[0017] Figure 7 is a schematic connection structure diagram of the backpressure disk reciprocating drive unit and the backpressure disk abutting unit of the present utility model;

[0018] Figure 8 is Figure 7 a partial enlarged view.

[0019] In the figures: 1. Backpressure disk; 11. Conical ring; 12. Ring; 13. End plate; 14. Paddle; 2. Screw shaft connection unit; 21. Hoop; 211. Card slot; 22. Rotating shaft; 3. Reciprocating linear drive unit; 31. Telescopic cylinder; 32. Guide sleeve; 321. Flange; 33. Stud; 34. Connecting shaft; 4. Backpressure disk abutting unit; 41. Y-shaped joint; 42. Bearing; 43. Pin shaft; 44. Liner; 45. Hose clamp; 600. Screw press housing. Detailed Embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment

[0021] Please refer to Figures 1-8 , the present utility model provides a technical solution: a new back pressure device for a screw press, including a back pressure disk 1, a screw shaft connection unit 2, and a back pressure disk abutting unit 4; the front end of the back pressure disk 1 is a conical ring 11, the end of the conical ring 11 is provided with a circular ring 12 adapted to its outer diameter, the end of the circular ring 12 is provided with an end plate 13, the end plate 13 is a ring-shaped structure, and the bearings 42 are all abutted against the back of the end plate 13; a paddle 14 is provided on the circumferential outer wall of the circular ring 12, and the paddle 14 is an inverted L-shaped plate structure;

[0022] The screw shaft connection unit 2 includes a hoop 21 provided on the back of the back pressure disk 1, the hoop 21 is coaxially arranged with the back pressure disk 1, a plurality of card slots 211 are provided on the circumferential outer wall of the hoop 21, and a rotating shaft 22 that can slide along the axial direction of the hoop 21 is embedded in each of the card slots 211, and the heads of the rotating shafts 22 are all fixed on the back of the back pressure disk 1; the back pressure disk abutting unit 4 includes a Y-shaped joint 41 provided on the back of the back pressure disk 1, a bearing 42 is rotatably connected between the ear plates of the Y-shaped joint 41 through a pin shaft 43, the bearing 42 is a self-sealing ball bearing, and the bearing 42 abuts against the back of the back pressure disk 1; the back pressure disk abutting units 4 are all located outside the hoop 21, and the number of the back pressure disk abutting units 4 is not less than two; the ends of the Y-shaped joints 41 are all connected to a reciprocating linear driving unit 3 that can drive it to reciprocate along the axial direction of the back pressure disk 1;

[0023] The reciprocating linear driving unit 3 includes a connecting shaft 34 fixedly connected to the Y-shaped joint 41, a guiding sleeve 32 is nested outside the connecting shaft 34, a telescopic cylinder 31 is fixedly provided at the end of the guiding sleeve 32, and the telescopic end of the telescopic cylinder 31 penetrates into the guiding sleeve 32 and is fixedly connected to the connecting shaft 34; a flange 321 is provided on the circumferential outer wall of the guiding sleeve 32;

[0024] The telescopic cylinder 31 is a cylinder, and the telescopic cylinder 31 is fixedly connected to the flange 321 through a stud 33 and a nut; an installation hole for connecting to the screw press housing 600 is also provided on the flange 321.

[0025] Working principle:

[0026] The guiding sleeve 32 is fixedly connected to the housing 600 of the screw press through a flange 321. When the telescopic cylinder 31 extends, it pushes the connecting shaft 34 to move axially within the guiding sleeve 32. The connecting shaft 34 pushes the Y-shaped joint 41 and the bearing 42 towards the back pressure plate 1. The bearing 42 pushes the back pressure plate 1 towards the discharge port of the screw press. Meanwhile, the screw shaft of the screw press drives the hoop 21 to rotate. The hoop 21 drives the rotating shaft 22 and the back pressure plate 1 to rotate together with the screw shaft. The screw shaft compresses, dehydrates the material entering the screw press step by step and pushes it to the discharge port. At the same time, under the reverse pressure of the back pressure plate 1, the material is further dehydrated at the discharge port, realizing further solid-liquid separation. The removed water or liquid is discharged from the sieve holes of the equipment, and the remaining material will continue to move axially under the continuous push of the subsequent material. When the pressure of the material at the discharge port is greater than the reverse pressure of the back pressure plate 1, the back pressure plate 1 is pushed open by the material, and the material will be discharged along the conical ring 11 of the back pressure plate 1. Under the action of the deflector 14, the plugged and lumped materials will be broken up and discharged in a dispersed manner, completing the continuous discharging process.

[0027] Further, lining rings 44 are nested at the axial end faces of the pin shaft 43 at both ends of the bearing 42. The ear plates of the Y-shaped joint 41 press the bearing 42 through the lining rings 44. A hose clamp 45 is provided at the position of the pin shaft 43 on the Y-shaped joint 41. The stability of the bearing 42 during rolling is increased by the lining rings 44, and the pin shaft 43 is tightly fixed by the hose clamp 45.

[0028] The novel back pressure device of the screw press disclosed in this embodiment: The back pressure plate 1 is synchronously rotationally connected to the screw shaft of the screw press through the hoop 21 and the rotating shaft 22, maintaining the integrity and strength of the screw shaft, and ensuring the durability and reliability of the equipment. The back pressure plate 1 can be moved axially through the reciprocating linear drive unit 3, and the axial position of the back pressure plate 1 can be adjusted, improving the discharging efficiency and dehydration efficiency of the material, and being applicable to different types of pulp. The bearing 42 is in rolling contact with the back of the back pressure plate 1, reducing the wear on the back of the back pressure plate 1. The bearing 42 is rotationally connected to the Y-shaped joint 41 through the pin shaft 43, improving the stability of the bearing 42 in rolling contact with the back pressure plate 1. The deflector 14 is fixed on the ring 12 of the back pressure plate 1, which can effectively prevent blockage at the discharge between the discharge port and the conical ring 11, improve the discharging efficiency, and ensure that the pulp is broken up during the discharging process.

[0029] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new backpressure device for a screw press, comprising a backpressure disc, a screw shaft connection unit and a backpressure disc abutting unit, characterized in that: The spiral shaft connection unit includes a hoop provided on the back surface of the back pressure plate. The hoop is coaxially arranged with the back pressure plate. A plurality of card slots are provided on the circumferential outer wall of the hoop, and a rotating shaft that can slide along the axial direction of the hoop is embedded in each card slot. The heads of the rotating shafts are all fixed on the back surface of the back pressure plate. The back pressure plate abutting unit includes a Y-shaped joint provided on the back surface of the back pressure plate. A bearing is rotatably connected between the ear plates of the Y-shaped joint through a pin shaft, and the bearing abuts against the back surface of the back pressure plate. The back pressure plate abutting units are all located on the periphery of the hoop, and the number of back pressure plate abutting units is not less than two. A reciprocating linear drive unit that can drive the Y-shaped joint to reciprocate along the axial direction of the back pressure plate is connected to the end of each Y-shaped joint.

2. The novel back pressure device of a screw press according to claim 1, characterized in that: The reciprocating linear drive unit includes a connecting shaft fixedly connected to the Y-shaped joint. A guide sleeve is nested on the periphery of the connecting shaft. A telescopic cylinder is fixedly provided at the end of the guide sleeve. The telescopic end of the telescopic cylinder penetrates into the guide sleeve and is fixedly connected to the connecting shaft. A flange is provided on the circumferential outer wall of the guide sleeve.

3. The novel backpressure device of a screw press according to claim 2, characterized in that: The telescopic cylinder is a cylinder, and the telescopic cylinder and the flange are fixedly connected through a stud and a nut.

4. The novel back pressure device of a screw press according to claim 1, characterized in that: Liner rings are nested at the axial end faces of both ends of the bearing on the pin shaft, and the ear plates of the Y-shaped joint press the bearing through the liner rings. A hose clamp is provided at the position of the pin shaft on the Y-shaped joint.

5. The novel back pressure device of a screw press according to claim 1, characterized in that: The front end of the back pressure plate is a tapered ring. A ring adapted to its outer diameter is provided at the end of the tapered ring. An end plate is provided at the end of the ring. The end plate is a ring-shaped structure, and the bearings all abut against the back surface of the end plate. A dial is provided on the circumferential outer wall of the ring.

6. The novel backpressure device of a screw press according to claim 5, characterized in that: The dial is an inverted L-shaped plate structure.

7. The novel back pressure device of a screw press according to claim 1, characterized in that: The bearing is a self-sealing ball bearing.

Images