CN220991668U

CN220991668U - Screening shaft of roller screening machine

Info

Publication number: CN220991668U
Application number: CN202322822144.2U
Authority: CN
Inventors: 韦鹏; 刘刚; 周远祥; 贺永国
Original assignee: Y & J Industries Co ltd
Current assignee: Y & J Industries Co ltd
Priority date: 2023-10-20
Filing date: 2023-10-20
Publication date: 2024-05-24
Anticipated expiration: 2033-10-20

Abstract

The utility model relates to a screening shaft of a roller screening machine, and belongs to the technical field of roller screening machine design. The utility model comprises a transmission mandrel, wherein an installation area is formed in the middle of the transmission mandrel, the installation area is provided with a plurality of sieve sheets and baffle rings which are arranged at intervals, the outer diameter of the baffle rings is smaller than that of the sieve sheets, the sieve sheets and the baffle rings are sleeved on the transmission mandrel, two ends of the transmission mandrel are provided with fixing mechanisms for fixing the sieve sheets and the baffle rings on the transmission mandrel, a torque transmission structure is arranged between the transmission mandrel and an inner circular hole of the sieve sheets, the torque transmission structure comprises at least one L-shaped step protruding on the inner circular hole wall surface of the sieve sheets, the L-shaped step is arranged on the radial section of the inner circular hole, and the outer surface of the L-shaped step is L-shaped; the L-shaped step consists of a wide surface and a narrow surface, the right angle at which the wide surface and the narrow surface are intersected is rounded into a first round angle, and the outer circular surface of the transmission mandrel is provided with an L-shaped groove matched with the L-shaped step. The utility model can solve the problem that the torque transmission structure of the existing screen sheet is easy to cause key connection failure.

Description

Screening shaft of roller screening machine

Technical Field

The utility model relates to a screening shaft of a roller screening machine, and belongs to the technical field of roller screening machine design.

Background

The sieving machine is mainly divided into a vibrating sieving machine and a roller sieving machine, wherein the vibrating sieving machine has the advantages of high sieving precision and stable work, is widely applied to industries with high sieving precision requirements such as foods, medicines and chemical industry, and the roller sieving machine has the characteristics of no vibration, large treatment capacity, simple structure and the like, and is widely applied to industrial and mining enterprises such as large-scale metallurgy, chemical industry, building materials, coal systems, thermal power plants and the like.

The screening shaft of the current roller screening machine is generally composed of a transmission mandrel, a screen sheet, a baffle ring and other parts, the screen sheet and the baffle ring are sleeved on the transmission mandrel at intervals, fixing mechanisms for fixing the screen sheet and the baffle ring on the transmission mandrel are arranged at two ends of the transmission mandrel, the transmission mandrel and the screen sheet are connected with each other by adopting a key connection structure to transmit torque, the transmission mandrel and the screen sheet are connected by adopting a flat key or a tangential key according to different working conditions, and the common flat key is suitable for screening equipment in light load occasions such as variable load and impact at high speed due to the simple structure, convenient disassembly and assembly and good centering; the tangential keys are composed of two wedge keys with a gradient of 1:100, can transmit bidirectional torque, are separated by 90-135 degrees, and can be suitable for heavy screening equipment with low centering requirement and high load. However, in the using process of the equipment, the problem of key connection failure is easy to occur in the connecting mode due to the interference of various abnormal factors, so that equipment maintenance and shutdown are caused, and the production progress and the production cost are affected.

In addition, patent document with publication number CN217069532U discloses a working roll of screening machine, including a screening shaft, a mounting area is formed in the middle of the screening shaft, the mounting area is provided with a plurality of screen sheets and baffle rings which are arranged at intervals, the outer diameter of the baffle rings is smaller than that of the screen sheets, the screen sheets and the baffle rings are sleeved on the screening shaft, two fixing mechanisms for fixing the screen sheets or the baffle rings are arranged on the screening shaft, the fixing mechanisms are respectively positioned at two ends of the mounting area, the fixing mechanisms comprise a spacer sleeve and two round nuts which are sleeved on the screening shaft in sequence, the screen sheets or the baffle rings at the outermost side are contacted with the spacer sleeve, a stop washer for the round nuts is arranged between the two round nuts, the outer ring of the round nuts is provided with a plurality of openings, the outer ring of the stop washer for the round nuts is radially provided with a plurality of outer stop lugs, the inner ring is provided with inner stop lugs, the outer stop lugs are matched with the openings of the round nuts, and the corresponding inner stop lugs on the screening shaft are provided with matched keyways; the installation area forms the outer plane, and the sieve piece inner circle forms assorted interior plane, through the cooperation of two, restricts the rotation of sieve piece, realizes the transmission of moment of torsion. The improvement of the patent document focuses on the fixing mechanisms at two ends of the screening shaft, and the torque transmission structure is only realized by single plane contact formed by the outer plane of the installation area of the screening shaft and the inner plane of the inner ring of the screening sheet, so that the problem that key connection failure easily occurs is also solved.

Disclosure of utility model

The utility model aims to provide a screening shaft of a roller screening machine, which aims to solve the problem that a torque transmission structure between a transmission mandrel and a screen sheet is prone to key connection failure.

The technical scheme adopted for solving the technical problems is as follows: the screening shaft of the roller screening machine comprises a transmission mandrel, wherein an installation area is formed in the middle of the transmission mandrel, a plurality of screen sheets and baffle rings which are arranged at intervals are arranged in the installation area, the outer diameter of the baffle rings is smaller than that of the screen sheets, the screen sheets and the baffle rings are sleeved on the transmission mandrel, fixing mechanisms for fixing the screen sheets and the baffle rings on the transmission mandrel are arranged at two ends of the transmission mandrel, a torque transmission structure is arranged between the transmission mandrel and an inner circular hole of the screen sheets, the torque transmission structure comprises at least one L-shaped step which is convexly arranged on the inner circular hole wall surface of the screen sheets, and the L-shaped step is arranged on the radial section of the inner circular hole, and the outer surface of the L-shaped step is L-shaped; the L-shaped step consists of a wide surface and a narrow surface, the right angle at which the wide surface and the narrow surface are intersected is rounded into a first round angle, and the outer circular surface of the transmission mandrel is provided with an L-shaped groove matched with the L-shaped step.

Further preferred are: the inner circular hole of the sieve plate is provided with an air-relief groove which is arranged at the intersection position of the inner circular hole of the sieve plate and the narrow surface of the L-shaped step.

Further preferred are: the air-relief groove is a semicircular hole, the center of the semicircular hole is positioned on the cylindrical surface where the inner circular hole of the sieve sheet is positioned, and one side of the semicircular hole is tangent to the narrow surface of the L-shaped step.

Further preferred are: any radial section of an inner circular hole of the sieve sheet is taken as a reference plane, a straight line which passes through the center of the inner circular hole and is parallel to the wide surface of the L-shaped step is taken as an X axis, a straight line which passes through the center of the inner circular hole and is perpendicular to the X axis is taken as a Y axis, and the end of the wide surface of the L-shaped step, which is close to the narrow surface, spans across the Y axis.

Further preferred are: the number of the L-shaped steps is two, and the L-shaped steps are arranged in a central symmetry manner relative to the circle center of the inner round hole; the outer peripheral surface of the screening sheet is provided with a plurality of screening teeth which are uniformly and alternately distributed along the circumferential direction, the working surfaces of the screening teeth are arc-shaped surfaces, two adjacent screening teeth are in smooth transition connection through a concave arc surface, the number of the screening teeth is an odd number, and the central line of one screening tooth is overlapped with the Y axis; for two adjacent screen plates on the transmission mandrel, the screening teeth of the former screen plate are opposite to the area where the concave cambered surface on the peripheral surface of the latter screen plate is located, namely the screen plates are staggered on the transmission mandrel, and the screening teeth between the two adjacent screen plates are staggered. It is understood that the preferred scheme of the number of the L-shaped steps being two and being arranged in a central symmetry manner relative to the center of the inner circular hole is applicable to all the embodiments of the torque transmission structure, and is not limited to the scheme that the screen sheets are arranged in an intersecting manner.

Further, the sieve sheet and the L-shaped step are of an integrated structure.

Further, the connection and matching structure between the central inner hole of the baffle ring and the transmission mandrel is the same as the connection and matching structure between the inner round hole of the sieve sheet and the transmission mandrel.

The beneficial effects of the utility model are as follows: the L-shaped step is matched with the L-shaped groove on the outer circular surface of the transmission mandrel to form a torque transmission pair, the wide surface and the narrow surface of the L-shaped step are working surfaces, compared with the tangential key, only the narrow surface is the working surface, the stress area is increased, the stress value is reduced, the round corner structure design of the connecting part of the wide surface and the narrow surface further weakens the stress concentration at the sharp corner, and the utility model can bear the bidirectional impact load of large-scale equipment, high power and high torque, and has the advantages of stable operation of the equipment, improved reliability and reduced equipment failure rate. In addition, the screen plates are staggered, so that the conveying of minerals such as coal materials is facilitated, and dead angles formed by adjacent screening shafts can be reduced.

Drawings

Fig. 1 is a side view of a screening spindle according to the present utility model.

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1.

Fig. 3 is a front view of a screen sheet of the present utility model.

Fig. 4 is a front view of a drive spindle in accordance with the present utility model.

FIG. 5 is a left side view of a drive spindle in the present utility model

Fig. 6 is a partially enlarged schematic structural view at B of fig. 5.

Fig. 7 is a front view of the retainer ring of the present utility model.

FIG. 8 is a schematic view of the C-C cross-sectional structure of FIG. 7.

The parts in the figure are marked as follows: the screening sheet 1, the L-shaped step 10, the wide surface 101, the first round angle 102, the narrow surface 103, the inner circular hole 11, the air escape groove 12, the air escape groove center 121, the screening teeth 13, the transmission mandrel 2, the groove wide surface 201, the second round angle 202, the groove narrow surface 203, the baffle ring 3 and the short shaft 4.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

Referring to fig. 1 to 8, the utility model comprises a transmission mandrel 2, wherein an installation area is formed in the middle of the transmission mandrel 2, the installation area is provided with a plurality of screen sheets 1 and baffle rings 3 which are arranged at intervals, the outer diameter of the baffle rings 3 is smaller than that of the screen sheets 1, the screen sheets 1 and the baffle rings 3 are sleeved on the transmission mandrel 2, two ends of the transmission mandrel 2 are provided with fixing mechanisms for fixing the screen sheets 1 and the baffle rings 3 on the transmission mandrel 2, a torque transmission structure is arranged between the transmission mandrel 2 and an inner circular hole 11 of the screen sheets 1, the torque transmission structure comprises at least one L-shaped step 10 protruding on the wall surface of the inner circular hole 11 of the screen sheets 1, the L-shaped step 10 is arranged on the radial section of the inner circular hole 11, and the outer surface of the L-shaped step 10 is L-shaped; the L-shaped step 10 consists of a wide surface 101 and a narrow surface 103, a right angle at which the wide surface 101 and the narrow surface 103 are intersected is rounded into a first round angle 102, the outer circular surface of the transmission mandrel 2 is provided with an L-shaped groove matched with the L-shaped step 10, namely the L-shaped groove consists of a groove wide surface 201, a second round angle 202 and a groove narrow surface 203 matched with all parts of the L-shaped step 10.

For the convenience of processing and manufacturing, the sieve sheet 1 and the L-shaped step 10 are preferably of an integrated structure, and can be molded at one time by casting generally, so that the inner circular hole 11 and the L-shaped step 10 do not need additional machining, and only the relevant matching surfaces are polished and cleaned, thereby reducing the production and manufacturing cost. The excircle of the transmission mandrel 2 can be mechanically machined and formed, and the L-shaped groove and other related structures can be machined by milling, so that the dimensional accuracy is high. The design of the first rounded corner 102 facilitates one-shot casting while reducing stress concentration during operation of the drive shaft. The structural design of the second fillet 202 can reduce stress concentration during operation of the drive shaft. The plum blossom sieve piece, sleeve hole set up "L" type step and the little clearance matching of transmission dabber "L" type breach form the moment of torsion transmission pair, and the broad face 101 and the narrow face 103 of L shape step 10 are the working face, and can transmit two-way moment of torsion, have greatly increased the area of force for the working face than tangential key only the narrow face, and stress value reduces, can bear the high-power, two-way impact load of big moment of torsion of large-scale equipment, and equipment operation is steady, and the reliability improves, and equipment fault rate is greatly reduced.

In order to make the structure more reliable, the number of the L-shaped steps 10 is preferably two, and the L-shaped steps 10 are arranged in a central symmetry manner relative to the circle center of the inner circular hole 11, and one L-shaped step 10 rotates 180 degrees clockwise or anticlockwise about the circle center of the inner circular hole 11 and can be overlapped with the other L-shaped step 10.

In order to make the structure more reliable, the inner circular holes 11 of the sieve sheet 1 are provided with air-relief grooves 12, and the air-relief grooves 12 are arranged at the positions where the inner circular holes 11 of the sieve sheet 1 intersect with the narrow faces 103 of the L-shaped steps 10. The air relief groove 12 is preferably a semicircular hole, the center of which (namely, the center 121 of the air relief groove in the drawing) is positioned on the cylindrical surface where the inner circular hole 11 of the sieve plate 1 is positioned, and one side of the semicircular hole is tangential to the narrow surface 103 of the L-shaped step 10. The structural design of the degassing tank 12 is beneficial to eliminating stress concentration phenomenon.

In order to make the structure more reliable, taking any radial section of the inner circular hole 11 of the sieve sheet 1 as a reference plane, a straight line passing through the center of the inner circular hole 11 and parallel to the wide surface 101 of the L-shaped step 10 is an X axis, a straight line passing through the center of the inner circular hole 11 and perpendicular to the X axis is a Y axis, and the end of the wide surface 101 of the L-shaped step 10, which is close to the narrow surface 103, spans across the Y axis. In the embodiment shown in fig. 3, the broad face 101 of one L-shaped step 10 located below spans the Y-axis laterally from right to left and beyond the Y-axis by a set spacing; correspondingly, referring to fig. 5 and 6, the groove width 201 of the lower one of the L-shaped grooves extends laterally across the Y-axis from right to left and beyond the Y-axis by a set spacing, labeled a3 in fig. 6. An upper L-shaped step 10 and L-shaped groove are designed in the manner described above.

Preferably, the outer peripheral surface of the screen sheet 1 is provided with a plurality of screening teeth 13 which are uniformly distributed at intervals along the circumferential direction, the working surface of each screening tooth 13 is an arc surface, two adjacent screening teeth 13 are in smooth transition connection through a concave arc surface, the number of the screening teeth 13 is an odd number, and the central line of one screening tooth 13 is overlapped with the Y axis; for two adjacent screen plates 1 on the transmission mandrel 2, the screening teeth 13 of the previous screen plate 1 are opposite to the area where the concave cambered surface on the outer peripheral surface of the next screen plate 1 is located, namely, the screen plates 1 are staggered on the transmission mandrel 2, and the screening teeth 13 between the two adjacent screen plates 1 are staggered (are not opposite to each other), so that the conveying of minerals such as coal materials is facilitated, and dead angles formed by the adjacent screening shafts can be reduced. In this structural solution, the number of L-shaped steps 10 of each sieve sheet 1 is preferably designed to be two, and the two L-shaped steps 10 are arranged in a central symmetry manner relative to the center of the inner circular hole 11; the advantage of this design is that all the screen plates 1 can be designed according to the same design without having to separately machine two different screen plates 1. For two adjacent screen plates 1 on the transmission mandrel 2, after the former screen plate 1 is installed, the latter screen plate 1 only needs to correspondingly rotate 180 degrees for installation.

The baffle ring 3 mainly plays a role in separation and can be sleeved on the transmission mandrel 2, so that the structure is more reliable, and preferably, the connection matching structure between the central inner hole of the baffle ring 3 and the transmission mandrel 2 is the same as the connection matching structure between the inner circular hole 11 of the sieve sheet 1 and the transmission mandrel 2, namely, the central inner hole of the baffle ring 3 is also designed with structures such as an L-shaped step 10, a degassing tank 12 and the like. The baffle ring 3 is preferably produced by adopting a casting one-step forming and heat treatment strengthening process, and no additional machining is needed.

Other structures of the screening spindle can be implemented with reference to the prior art, for example, the transmission spindle 2 can be generally hollow, and then the stub shafts 4 are detachably connected to both ends of the transmission spindle 2. The fixing mechanisms at two ends of the transmission mandrel 2 can be assembled by adopting locking nuts and other parts, and can be implemented by referring to the patent document with the publication number of CN217069532U in the background art.

Claims

1. The utility model provides a screening axle of roller screening machine, including transmission dabber (2), transmission dabber (2) middle part forms the installation district, the installation district is equipped with sieve piece (1) and fender ring (3) that a plurality of intervals set up, the external diameter of fender ring (3) is less than the external diameter of sieve piece (1), sieve piece (1) and fender ring (3) cover are established on transmission dabber (2), transmission dabber (2) both ends are provided with and are used for fixing sieve piece (1) and fender ring (3) at the fixed establishment on transmission dabber (2), be equipped with moment of torsion transmission structure between interior round hole (11) of transmission dabber (2) and sieve piece (1), its characterized in that: the torque transmission structure comprises at least one L-shaped step (10) protruding on the wall surface of an inner circular hole (11) of the sieve sheet (1), wherein the L-shaped step (10) is arranged on the radial section of the inner circular hole (11), and the outer surface of the L-shaped step is L-shaped; the L-shaped step (10) consists of a wide surface (101) and a narrow surface (103), a right angle where the wide surface (101) and the narrow surface (103) are intersected is rounded into a first round angle (102), and the outer circular surface of the transmission mandrel (2) is provided with an L-shaped groove matched with the L-shaped step (10).

2. The screening shaft of a roller screen machine of claim 1, wherein: the inner circular hole (11) of the sieve sheet (1) is provided with a degassing groove (12), and the degassing groove (12) is arranged at the intersection position of the inner circular hole (11) of the sieve sheet (1) and the narrow surface (103) of the L-shaped step (10).

3. The screening shaft of a roller screen machine of claim 2, wherein: the air-relief groove (12) is a semicircular hole, the center of the semicircular hole is positioned on the cylindrical surface where the inner circular hole (11) of the sieve sheet (1) is positioned, and one side of the semicircular hole is tangent to the narrow surface (103) of the L-shaped step (10).

4. The screening shaft of a roller screen machine of claim 1, wherein: any radial section of an inner circular hole (11) of the sieve sheet (1) is taken as a reference plane, a straight line passing through the center of the inner circular hole (11) and parallel to the wide surface (101) of the L-shaped step (10) is taken as an X axis, a straight line passing through the center of the inner circular hole (11) and perpendicular to the X axis is taken as a Y axis, and the end of the wide surface (101) of the L-shaped step (10) close to the narrow surface (103) spans across the Y axis.

5. The screening shaft of a roller screen machine as defined in claim 4, wherein: the number of the L-shaped steps (10) is two, and the L-shaped steps are arranged in a central symmetry manner relative to the circle center of the inner round hole (11); the outer peripheral surface of the screen sheet (1) is provided with a plurality of screening teeth (13) which are uniformly distributed at intervals along the circumferential direction, the working surface of each screening tooth (13) is an arc surface, two adjacent screening teeth (13) are in smooth transition connection through a concave arc surface, the number of the screening teeth (13) is an odd number, and the central line of one screening tooth (13) is overlapped with the Y axis; for two adjacent screen plates (1) on the transmission mandrel (2), the screening teeth (13) of the previous screen plate (1) are opposite to the area where the concave cambered surface on the peripheral surface of the next screen plate (1) is located.

6. The screening shaft of a roller screen machine of claim 1, wherein: the number of the L-shaped steps (10) is two, and the L-shaped steps are arranged in a central symmetry manner relative to the circle center of the inner round hole (11).

7. The screening shaft of a roller screen machine of claim 1, wherein: the sieve sheet (1) and the L-shaped step (10) are of an integrated structure.

8. The screen shaft of a roller screen machine as recited in any one of claims 1 to 7, wherein: the connecting and matching structure between the central inner hole of the baffle ring (3) and the transmission mandrel (2) is the same as the connecting and matching structure between the inner circular hole (11) of the sieve sheet (1) and the transmission mandrel (2).