CN113247557A - Middle supporting structure for screw shaft - Google Patents

Abstract

The invention provides an intermediate bearing structure for a screw shaft, which relates to the technical field of screw conveying equipment and comprises conveying pipes, a screw shaft, a supporting ring seat, supporting spokes, outer cylinders, a bearing seat and a coupling, wherein one ends, close to the two outer cylinders, are detachably connected through the supporting ring seat, and the other ends, far away from the two outer cylinders, are detachably connected with one ends of the corresponding conveying pipes respectively; the bearing seat is connected with the support ring seat through support spokes, the bearing seat is positioned in the outer barrel, a bearing is arranged in the bearing seat, the coupler is arranged in an inner ring of the bearing, and two ends of the coupler are suitable for being detachably connected with the corresponding spiral shaft. The mounting efficiency of the intermediate support is improved.

Description

Middle supporting structure for screw shaft

Technical Field

The invention relates to the technical field of spiral conveying equipment, in particular to an intermediate supporting structure for a spiral shaft.

Background

The total length of the screw shaft of the existing screw conveying equipment is 8-35 m, the shaft diameter is different from 60-300 mm, and the quality is different. Since it is difficult to achieve smooth high-speed operation without providing the intermediate bearing due to the long length, the intermediate bearing must be provided every 4mm to 6m along the screw axis.

Chinese patent grant publication No. CN 205978122U's utility model discloses a antifriction bearing formula intermediate support structure for screw axis, including urceolus, antifriction bearing and intermediate support bearing frame, its characteristics are that the intermediate support bearing frame that is equipped with antifriction bearing passes through the support stick and the urceolus fixed connection that the interval set up, and the integral key shaft is installed in the antifriction bearing inner circle, and antifriction bearing's upper and lower both ends face all is equipped with the oil blanket, and the oil blanket gland passes through the tang and the bolt is connected with intermediate support bearing frame, and the integral key shaft passes through splined connection and fixes with the spline housing flange. Although the utility model discloses a can solve the screw axis that length is very long through antifriction bearing formula intermediate bearing structure and can realize steady high-speed moving function, it still has following defect: the utility model discloses a well meeting can be difficult to be connected fixedly with the bearing frame respectively with the both ends of supporting the stick because the urceolus of installing in advance, perhaps will support the stick one end and be connected the back with the bearing frame in advance and be difficult to accomplish the other end of supporting the stick and the installation of urceolus fixed, this intermediate support structure is all more difficult when the dismouting.

Disclosure of Invention

The invention aims to improve the assembly and disassembly efficiency of an intermediate bearing in a screw shaft.

In order to solve the above problems, the present invention provides an intermediate support structure for a screw shaft, comprising:

a support ring seat;

supporting spokes;

the vertical ends, close to the two outer cylinders, of the outer cylinders are detachably connected through the supporting ring seats, and the ends, far away from the two outer cylinders, of the two outer cylinders are respectively suitable for being detachably connected with one end of the corresponding conveying pipe;

the bearing seat is connected with the support ring seat through the support spokes and is positioned in the outer barrel, and a bearing is arranged in the bearing seat; and

and the coupler is arranged in the inner ring of the bearing, and two ends of the coupler are suitable for being detachably connected with the corresponding spiral shaft.

Further, the bearing frame includes a plurality of first arc lamella, and is a plurality of first arc lamella is suitable for assembling to the bearing frame, the bearing includes a plurality of second arc lamella, and is a plurality of second arc lamella is suitable for assembling to the bearing, the urceolus includes a plurality of third arc lamella, and is a plurality of third arc lamella is suitable for assembling to the urceolus, the support ring seat includes a plurality of fourth arc lamella, and is a plurality of fourth arc lamella is suitable for assembling to the support ring seat.

Furthermore, the supporting ring seat is provided with a first concave part, one end of the outer barrel, which is close to the supporting ring seat, is provided with a first boss structure, the positioning of the outer barrel and the supporting ring seat is completed through the matching of the first boss structure and the first concave part, and the first boss structure is suitable for being connected with the supporting ring seat through bolts.

Furthermore, two one ends that the urceolus was kept away from mutually all are provided with the eighth flange, the conveyer pipe is close to the one end that corresponds the urceolus be provided with eighth flange complex ninth flange.

Furthermore, the support ring seat is provided with a groove, one end of the support spoke, which is far away from the bearing seat, extends into the groove, an oil supply hole is formed from one end of the support spoke to the other end of the support spoke, and an oil nozzle is arranged at one end of the support spoke, which extends into the groove.

Furthermore, an observation port is formed in the outer barrel, an observation window is arranged at the position of the observation port, and the observation window is suitable for opening and closing the observation port.

Further, the coupling includes:

the mounting sphere is arranged at one end of the mounting sphere, which is far away from the outer spherical gear shaft, a positioning plane is arranged at one end of the mounting sphere, and a first flange is coaxially arranged at the other end of the outer spherical gear shaft;

the inner ball gear shaft is coaxially provided with a second flange at one end, an inner ball gear seat is arranged at the other end of the inner ball gear shaft, the inner ball gear seat is provided with an installation groove, the inner wall of the installation groove comprises a first spherical peripheral surface and an inner end surface which are connected, the first spherical peripheral surface is matched with the spherical surface of the installation ball body, the first spherical peripheral surface is suitable for being connected with a spherical surface spline of the installation ball body, a positioning ball is arranged at the center of the inner end surface and is suitable for being abutted to the positioning plane; and

the spherical tooth cap is suitable for being sleeved on the installation ball body, the inner wall of the spherical tooth cap comprises a second spherical peripheral surface and a straight peripheral surface which are connected, the second spherical peripheral surface is matched with the spherical surface of the installation ball body, the inner diameter of the straight peripheral surface is larger than the diameter of the outer spherical tooth shaft, and the spherical tooth cap is suitable for being connected with the inner spherical tooth seat to fix the installation ball body in the installation groove.

Furthermore, an annular groove is formed in the second spherical circumferential surface, and a sealing ring is installed in the annular groove.

Furthermore, key grooves are formed in the surface of the inner spherical tooth shaft and the surface of the outer spherical tooth shaft, and the key grooves are suitable for being in key connection with the helical blades.

Furthermore, the first flange and the second flange have the same structure, one end of the screw shaft close to the coupler is provided with a seventh flange matched with the first flange, the seventh flange is provided with a positioning groove, the first flange and the second flange are provided with positioning pieces matched with the positioning groove, and the seventh flange is suitable for being connected with the first flange or the second flange through bolts.

Compared with the prior art, the intermediate support structure for the screw shaft has the following beneficial effects that:

the shaft coupling can be firstly installed in the inner ring of the bearing in the bearing seat, so that the shaft coupling can rotate along with the inner ring of the bearing, then two ends of the shaft coupling are respectively connected with the screw shaft at the upper section and the screw shaft at the lower section, thus the installation of the screw shaft is completed, then the screw blade is installed on the shaft coupling and is simultaneously connected with the screw blade on the screw shaft at the upper section and the screw blade on the screw shaft at the lower section, because the length of one outer cylinder is less than the distance between the delivery pipe at the upper section and the delivery pipe at the lower section, an outer cylinder (namely, a lower outer cylinder which is installed at the lower side) can be connected with the delivery pipe at the lower section, then the lower outer cylinder can be connected with the delivery pipe at the lower section, then the bearing seat is supported by the supporting ring seat and the supporting spokes, the supporting seat is moved into the outer cylinder from the outside by taking the distance between the lower outer cylinder and the delivery pipe at the upper section as an operating space, the supporting seat is connected with the outer cylinder at the lower side, and finally, the other outer cylinder is respectively connected with the conveying pipe at the upper section and the supporting ring seat.

Drawings

Fig. 1 is a schematic structural view of an intermediate support structure for a screw shaft according to an embodiment of the present invention;

FIG. 2 is a schematic block diagram of a coupling of an embodiment of the present invention;

fig. 3 is an enlarged view of a portion a in fig. 2.

Description of the labeling:

1-external spherical tooth shaft, 11-installation ball, 111-positioning plane, 12-first flange, 2-internal spherical tooth shaft, 21-second flange, 22-internal spherical tooth seat, 221-installation groove, 2211-internal end face, 3-positioning ball, 5-spherical tooth cap, 52-second spherical peripheral face, 53-flat peripheral face, 6-sealing ring, 71-conveying pipe, 711-ninth flange, 72-spiral shaft, 721-seventh flange, 73-supporting ring seat, 731-groove, 74-supporting spoke, 741-oil supply hole, 75-external cylinder, 751-first boss structure, 752-eighth flange, 753-observation window, 76-bearing seat, 77-coupler, 78-spiral blade and 8-positioning piece.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1, the intermediate support structure for the screw shaft according to the embodiment of the present invention includes a conveying pipe 71, a screw shaft 72, a support ring seat 73, support spokes 74, outer cylinders 75, a bearing seat 76 and a coupling 77, wherein the ends of the two outer cylinders 75 close to each other are detachably connected through the support ring seat 73, and the ends of the two outer cylinders 75 far away from each other are respectively detachably connected with one end of the corresponding conveying pipe 71; the bearing seat 76 is connected with the supporting ring seat 73 through the supporting spokes 74, the bearing seat 76 is positioned in the outer cylinder 75, the bearing is installed in the bearing seat 76, the coupler 77 is installed in the inner ring of the bearing, and two ends of the coupler 77 are suitable for being detachably connected with the corresponding screw shafts 72.

It is understood that the intermediate support structure for a screw shaft of the present embodiment is used to connect two conveying pipes (an upper conveying pipe and an adjacent lower conveying pipe) and two screw shafts (an upper screw shaft and an adjacent lower screw shaft), and plays an intermediate support role.

Here, the coupling 77 may be first installed in the inner ring of the bearing in the bearing housing 76 so that the coupling 77 can rotate with the inner ring of the bearing, then both ends of the coupling 77 are respectively connected with the upper screw shaft 72 and the lower screw shaft 72, thus completing the installation of the screw shafts 72, then the screw blades 78 are installed on the coupling 77 and are simultaneously connected with the screw blades 78 on the upper screw shaft 72 and the screw blades 78 on the lower screw shaft 72, then one outer cylinder is connected with the lower delivery pipe 71, then one outer cylinder 75 may be connected with the lower delivery pipe 71, then the bearing housing 76 is supported by the support ring seat 73 and the support spokes 74, so that the support ring seat 73 is simultaneously connected with the lower outer cylinder 75, thus ensuring the smooth high-speed operation of the screw shafts 72, and finally the other outer cylinder 75 is respectively connected with the upper delivery pipe 71 and the support ring seat 73, the middle supporting structure for the screw shaft provided by the embodiment has the advantages of high mounting efficiency and stable structure.

Preferably, bearing seat 76 includes a plurality of first arc petals adapted to be assembled into bearing seat 76, the bearing includes a plurality of second arc petals adapted to be assembled into the bearing, outer barrel 75 includes a plurality of third arc petals adapted to be assembled into outer barrel 75, support ring seat 73 includes a plurality of fourth arc petals adapted to be assembled into support ring seat 73.

Here, by setting the bearing to a structure formed by assembling a plurality of second arc petals, the plurality of second arc petals can be sequentially wrapped on the outer side of the coupling 77, and the plurality of second arc petals are fixed as a whole to form the bearing, then, the plurality of first arc petals can be first wrapped on the outer side of the bearing, and the plurality of first arc petals are fixed as a whole to form the bearing seat 76, then, the plurality of third arc petals can be sequentially connected with the lower section of the conveying pipe 71 and assembled into one outer cylinder 75, then, the support ring seat 73 and the support spokes 74 are installed in the same manner, and then, another outer cylinder 75 is assembled.

Referring to fig. 1, optionally, the support ring seat 73 is provided with a first recess, one end of the outer cylinder 75 near the support ring seat 73 is provided with a first boss structure 751, the positioning of the outer cylinder 75 and the support ring seat 73 is completed by the cooperation of the first boss structure 751 and the first recess, and the first boss structure 751 is suitable for being bolted with the support ring seat 73.

Here, the first recess is a groove-shaped structure formed on the support ring seat 73, and the first boss structure is a boss structure capable of being matched with the groove-shaped structure, after the boss structure is placed into the groove-shaped structure, the outer cylinder 75 and the support ring seat 73 are limited above the horizontal direction, at this time, the outer cylinder 75 and the support ring seat 73 are coaxial, positioning is completed, and after the support ring seat 73 and the outer cylinder 75 are positioned, the support ring seat 73 and the first boss structure 751 can be connected together through bolts, so that the installation efficiency is improved.

Referring to fig. 1, alternatively, the ends of the two outer cylinders 75 away from each other are provided with eighth flanges 752, and the end of the conveying pipe 71 close to the corresponding outer cylinder 75 is provided with a ninth flange 711 which is matched with the eighth flanges 752.

Here, the position of the delivery pipe and the outer cylinder 75 is precisely positioned by the eighth flange 752 and the ninth flange 711, and then the eighth flange 752 and the ninth flange 711 are connected by bolts, so that the installation efficiency is improved.

Referring to fig. 1, optionally, the supporting ring seat 73 is provided with a groove 731, one end of the supporting spoke 74 far away from the bearing seat 76 extends into the groove 731, an oil supply hole 741 is provided from one end of the supporting spoke 74 to the other end thereof, and an oil nozzle is provided at one end of the supporting spoke 74 extending into the groove 731.

Here, by providing the recess 731, an end of the supporting spoke 74 away from the bearing seat can be inserted into the recess 731, and then an oil supply hole 741 is formed in the supporting spoke 74, so that the oil supply hole 741 supplies the bearing with lubricating oil, thereby providing a service life.

Referring to fig. 1, optionally, a viewing port is opened on the outer tube 75, a viewing window 753 is provided at the viewing port, and the viewing window 753 is adapted to open and close the viewing port.

Here, by providing the outer tube 75 with a viewing port, it is advantageous to observe the internal working conditions even if a problem is found.

Referring to fig. 2 and 3, the coupling optionally comprises an outer button shaft 1, an inner button shaft 2 and a button cap 5. One end of the outer ball gear shaft 1 is provided with a mounting ball body 11, one end of the mounting ball body 11, which is far away from the outer ball gear shaft 1, is provided with a positioning plane 111, and the other end of the outer ball gear shaft 1 is provided with a first flange 12; a second flange 21 is coaxially arranged at one end of the inner spherical tooth shaft 2, an inner spherical tooth seat 22 is arranged at the other end of the inner spherical tooth shaft 2, an installation groove 221 is formed in the inner spherical tooth seat 22, the inner wall of the installation groove 221 comprises a first spherical peripheral surface and an inner end surface 2211 which are connected, the first spherical peripheral surface is matched with the spherical surface of the installation ball 11 and is suitable for being connected with the spherical surface of the installation ball through a spline, a positioning ball 3 is arranged at the center of the inner end surface 2211, and the positioning ball 3 is suitable for being abutted to the positioning plane 111; the spherical tooth cap 5 is suitable for being sleeved on the installation sphere 11, the inner wall of the spherical tooth cap 5 comprises a second spherical peripheral surface 52 and a straight peripheral surface 53 which are connected, the second spherical peripheral surface 52 is matched with the spherical surface of the installation sphere 11, the inner diameter of the straight peripheral surface 53 is larger than the diameter of the outer spherical tooth shaft 1, and the spherical tooth cap 5 is suitable for being connected with the inner spherical tooth seat 22 to fix the installation sphere 11 in the installation groove 221.

Note that one end of the outer ball gear shaft 1 refers to a lower end of the outer ball gear shaft 1, the other end of the outer ball gear shaft 1 refers to an upper end of the outer ball gear shaft, one end of the inner ball gear shaft 2 refers to a lower end of the inner ball gear shaft 2, and the other end of the inner ball gear shaft 2 refers to an upper end of the inner ball gear shaft 2.

The "installation sphere 11" is not a complete sphere, and can be regarded as an entity having two flat surfaces after two pieces of the complete sphere are cut off, the two flat surfaces are parallel, one flat surface is coaxially connected with one end of the outer spherical gear shaft 1, and the other flat surface is the aforementioned "positioning plane 111".

Referring to fig. 2 and fig. 3, the first spherical peripheral surface can be understood as a cylindrical surface, the distance from the cylindrical surface to the axis of the inner spline shaft 2 gradually increases from the lower end to the upper end, the first spherical peripheral surface is on the cross section of the plane where the axis of any inner spline shaft 2 is located, the cross section of the first spherical peripheral surface is on a circle (referred to as a first assumed circle), and the distance from the upper end of the first spherical peripheral surface to the axis of the inner spline shaft 2 is the radius of the first assumed circle; similarly, the second spherical peripheral surface 52 can also be understood as a cylindrical surface, the distance from the cylindrical surface to the axis of the outer spline shaft 1 gradually decreases from the lower end to the upper end, the cross section of the second spherical peripheral surface 52 on the plane where the axis of any one of the outer spline shafts 1 is located is also on a circle (referred to as a second hypothetical circle), and the distance from the lower end of the second spherical peripheral surface 52 to the axis of the outer spline shaft 1 is the radius of the second hypothetical circle, wherein the radius of the first hypothetical circle is the same as the radius of the second hypothetical circle. The distance from the lower end of the flat peripheral surface 53 to the axis of the outer ball gear shaft 1 is constant from the lower end to the upper end, and the distance from the lower end of the flat peripheral surface 53 to the axis of the outer ball gear shaft 1 is equal to the distance from the upper end of the second spherical peripheral surface 52 to the axis of the outer ball gear shaft 1.

Here, one screw shaft is connected to the first flange 12 at the end of the outer ball gear shaft 1 far from the mounting ball 11, and the other screw shaft is connected to the second flange 21 at the end of the inner ball gear shaft 2, so that the connection of the two screw shafts is realized, and the outer ball gear shaft 1 can transmit torque to the inner ball gear shaft 2 or the inner ball gear shaft 2 can transmit torque to the outer ball gear shaft 1 through the spherical spline coupling of the first spherical circumferential surface and the mounting ball 11, so that the transmission of torque between the two screw shafts 72 is realized. Through set up the locating ball 3 in the center department of interior terminal surface 2211 and be used for with the locating plane 111 butt of installation spheroid 11, with this guarantee that locating plane 111 has certain distance to interior terminal surface 2211, simultaneously, through the spherical cooperation of the second global 52 of the spherical tooth cap 5 inner wall after being connected with interior spherical tooth seat 22 and the sphere of installation spheroid 11 in order to guarantee that installation spheroid 11 can not break away from mounting groove 221, simultaneously, guarantee through the interval between the straight global 53 of spherical tooth cap 5 inner wall and the outer wall of outer spherical tooth axle 1 that outer spherical tooth axle 1 can be around the relative internal spherical tooth axle 2 certain angle of locating ball 3, thereby make certain machining error and installation error of permission, the moment of torsion transferability after two screw axis 72 connect has been improved.

In addition, after the second spherical peripheral surface 52 of the inner wall of the spherical tooth cap 5 is matched with the spherical surface of the mounting sphere 11, the mounting sphere 11 is limited to move along the axial direction of the outer spherical tooth shaft 1, and a large axial force can be borne.

It is understood that the spherical spline coupling of the first spherical peripheral surface with the mounting ball 11 means: the spherical surface of the installation sphere 11 is provided with a plurality of tooth sockets distributed at intervals, the plurality of tooth sockets are distributed around the axis of the outer spherical tooth shaft 1, the first spherical surface is provided with a plurality of teeth matched with the tooth sockets, and spline connection is realized through the matching of the teeth and the tooth sockets, wherein, it can be understood that the length of the teeth on the first spherical surface is less than that of the tooth sockets, so as to ensure that the installation sphere can slightly rotate in the installation groove.

Optionally, the second flange 21, the inner ball spline shaft 2 and the inner ball spline seat 22 are of an integrated structure, so that the structure is stable, the rigidity is higher, and in addition, the production cost is lower.

It can be understood that, when the coupling of the present embodiment is assembled, it may be: firstly, the installation ball body 11 at one end of the outer spherical tooth shaft 1 is installed in the installation groove 221 in the inner spherical tooth seat 22 until the positioning plane 111 abuts against the positioning ball 3, the spherical surface of the installation ball body 11 is in spline connection with the first spherical peripheral surface of the inner wall of the installation groove 221, and then the spherical tooth cap 5 is sleeved on the installation ball body 11 exposed outside the inner spherical tooth seat 22 and the spherical tooth cap 5 is connected with the inner spherical tooth seat 22.

It will be appreciated that the angle at which the outer ball spline shaft 1 can be deflected can be adjusted by controlling the distance from the outer wall of the outer ball spline shaft 1 produced to the flat peripheral surface 53.

Optionally, in order to facilitate the installation of the bearing seat, the bearing and the coupling, besides the aforesaid bearing seat and bearing may be provided as a split structure, the first flange 12 may be detachably connected to the outer ball-and-socket shaft 1, and the second flange 21 may be detachably connected to the inner ball-and-socket shaft 2.

Here, the first flange 12 and the outer ball gear shaft 1 are designed to be split structures, the integral bearing seat and the bearing can be installed on the outer ball gear shaft 1, the second flange and the inner ball gear shaft can be detachably connected, and the integral bearing seat and the bearing can also be installed on the inner ball gear shaft 2.

Optionally, the first flange 12 is splined to an external ball-and-socket shaft.

Here, the other end of the outer ball gear shaft 1, that is, the circumferential surface of the upper end is provided with a plurality of elongated grooves in the axial direction, and the inner ring of the first flange 12 is provided with a rack engaged with the plurality of elongated grooves, thereby realizing spline coupling.

Referring to fig. 2 and 3, optionally, an annular groove is formed at the second spherical peripheral surface 52, and the sealing ring 6 is installed in the annular groove.

Here, by providing the seal ring, dust is prevented from entering the inside of the coupling, and grease inside is prevented from overflowing.

Optionally, the surface of the inner ball spline shaft 2 and the surface of the outer ball spline shaft 1 are splined, the splines being adapted to key with the helical blades 78.

Referring to fig. 1, optionally, the first flange 12 and the second flange 21 have the same structure, one end of the screw shaft 72 close to the coupler 77 is provided with a seventh flange 721 matched with the first flange 12, the seventh flange 721 is provided with a positioning slot, the first flange 12 and the second flange 21 are provided with a positioning element 8 matched with the positioning slot, and the seventh flange 721 is adapted to be bolted to the first flange 12 or the second flange 21.

Here, the precise docking of the screw shaft 72 to the coupling 77 is ensured by the cooperation of the seventh flange 721 with the first flange 12 or with the second flange 21 and the cooperation of the positioning groove with the positioning member 8, after which the seventh flange 721 can be bolted to the first flange 12, the seventh flange 721 to the second flange 21.

In the description of the present invention, it is to be understood that the terms "lower", "upper", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the drawings, the Z-axis represents the vertical, i.e., up-down, position, and the positive direction of the Z-axis (i.e., the arrow of the Z-axis points) represents up, and the negative direction of the Z-axis (i.e., the direction opposite to the positive direction of the Z-axis) represents down; it should also be noted that the foregoing Z-axis representation is meant only to facilitate description of the invention and to simplify description, and is not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. An intermediate support structure for a screw shaft, comprising:

a support ring seat (73);

supporting spokes (74);

the vertical ends, close to the two outer cylinders (75), of the outer cylinders are detachably connected through the supporting ring seat (73), and the ends, far away from the two outer cylinders (75), of the outer cylinders are respectively suitable for being detachably connected with one end of the corresponding conveying pipe (71);

the bearing seat (76) is connected with the supporting ring seat (73) through the supporting spokes (74), the bearing seat (76) is positioned in the outer cylinder (75), and a bearing is installed in the bearing seat (76); and

the coupler (77) is installed in the inner ring of the bearing, and two ends of the coupler (77) are suitable for being detachably connected with the corresponding spiral shafts (72).

2. The intermediate bearing structure for a screw shaft according to claim 1, wherein said bearing housing (76) comprises a plurality of first arc-shaped lobes adapted to be assembled into said bearing housing (76), said bearing comprises a plurality of second arc-shaped lobes adapted to be assembled into said bearing, said outer barrel (75) comprises a plurality of third arc-shaped lobes adapted to be assembled into said outer barrel (75), said support ring seat (73) comprises a plurality of fourth arc-shaped lobes adapted to be assembled into said support ring seat (73).

3. The intermediate bearing structure for a screw shaft according to claim 1, wherein said support ring seat (73) is provided with a first recess, one end of said outer cylinder (75) near said support ring seat (73) is provided with a first boss structure (751), and said first boss structure (751) is adapted to be bolted with said support ring seat (73) by cooperation of said first boss structure (751) and said first recess to complete the positioning of said outer cylinder (75) and said support ring seat (73).

4. The intermediate support structure for a screw shaft according to claim 1, wherein each of ends of both of said outer cylinders (75) remote from each other is provided with an eighth flange (752), and an end of said delivery pipe (71) near the corresponding outer cylinder (75) is provided with a ninth flange (711) fitted with said eighth flange (752).

5. The intermediate bearing structure for a screw shaft according to claim 1, wherein the supporting ring seat (73) is formed with a recess (731), one end of the supporting spoke (74) remote from the bearing seat (76) extends into the recess (731), one end of the supporting spoke (74) to the other end thereof is formed with an oil supply hole (741), and one end of the supporting spoke (74) extending into the recess (731) is provided with an oil nipple.

6. The intermediate support structure for a screw shaft according to claim 1, wherein a viewing port is opened in said outer tube (75), said viewing port being provided with a viewing window (753), said viewing window (753) being adapted to open and close said viewing port.

7. An intermediate support structure for a screw shaft according to any one of claims 1 to 6, wherein said coupling comprises:

the outer ball gear shaft (1), one end of the outer ball gear shaft (1) is provided with a mounting ball body (11), one end, far away from the outer ball gear shaft (1), of the mounting ball body (11) is provided with a positioning plane (111), and the other end of the outer ball gear shaft (1) is coaxially provided with a first flange (12);

the inner ball tooth shaft (2), a second flange (21) is coaxially arranged at one end of the inner ball tooth shaft (2), an inner ball tooth seat (22) is arranged at the other end of the inner ball tooth shaft (2), a mounting groove (221) is formed in the inner ball tooth seat (22), the inner wall of the mounting groove (221) comprises a first spherical peripheral surface and an inner end surface (2211) which are connected, the first spherical peripheral surface is matched with the spherical surface of the mounting ball body (11), the first spherical peripheral surface is suitable for being connected with the spherical surface of the mounting ball body through a spline, a positioning ball (3) is arranged at the center of the inner end surface (2211), and the positioning ball (3) is suitable for being abutted to the positioning plane (111); and

the spherical tooth cap (5), the spherical tooth cap (5) be suitable for the cover on installation spheroid (11), the inner wall of spherical tooth cap (5) is including the spherical global (52) and the straight global (53) of second of connection, the spherical global (52) of second with the sphere phase-match of installation spheroid (11), the internal diameter of straight global (53) is greater than the diameter of outer ball tooth axle (1), spherical tooth cap (5) be suitable for with interior ball tooth seat (22) are connected in order to be fixed in installation spheroid (11) in mounting groove (221).

8. The intermediate support structure for a screw shaft according to claim 7, wherein an annular groove is formed at the second spherical peripheral surface (52), and a seal ring (6) is installed in the annular groove.

9. An intermediate support structure for a screw spindle according to claim 7, characterized in that the surface of the inner ball gear shaft (2) and the surface of the outer ball gear shaft (1) are splined, said splines being adapted to key-connect with helical blades (78).

10. The intermediate support structure for a screw shaft according to claim 7, wherein the first flange (12) and the second flange (21) have the same structure, one end of the screw shaft (72) near the coupling (77) is provided with a seventh flange (721) engaged with the first flange (12), the seventh flange (721) is provided with a positioning groove, the first flange (12) and the second flange (21) are provided with a positioning member (8) engaged with the positioning groove, and the seventh flange (721) is adapted to be bolted to the first flange (12) or the second flange (21).

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