CN216975711U - Gear box and double-screw extruder - Google Patents

Abstract

The utility model relates to the technical field of gear boxes, in particular to a gear box and a double-screw extruder. The gear box comprises a box body, an end cover, a first shaft system and a second shaft system, a first mounting hole and a second mounting hole are formed in the box body, and the output end of the box body is provided with a first inner spigot. The end part of the end cover facing the box body is provided with a first outer spigot, the end cover is arranged at the output end of the box body, and the first inner spigot is in inserting fit with the first outer spigot. The first shaft penetrates through the first mounting hole and penetrates out of the end cover, the first shaft is mounted in the end cover through a first bearing, and the first oil seal is mounted in the end cover and sleeved on the first shaft. The second shaft penetrates through the second mounting hole and penetrates out of the end cover, the second shaft is mounted in the box body through a second bearing, and the second oil seal is mounted in the end cover and sleeved on the first shaft. The double-screw extruder adopts the gear box, so that the coaxiality of the first bearing, the first oil seal and the second oil seal and the coaxiality of the corresponding mounting holes in the gear box are ensured, and the mounting precision is improved.

Description

Gear box and double-screw extruder

Technical Field

The utility model relates to the technical field of gear boxes, in particular to a gear box and a double-screw extruder.

Background

The double-screw extruder has the characteristics of good charging performance, mixing and plasticizing performance, extrusion stability and the like, and is widely applied to the molding processing of extruded products.

The double-screw extruder has the advantages that the center distance between two meshed screws is small, the working torque is large, the center distance between the double output shafts of the matched gear box is small, and the installation space of the bearings and the oil seals at the output ends of the double output shafts is small. Currently, positioning is performed by matching pin holes. But the processing efficiency of matching pin holes is lower and the cost is higher. And the position deviation of independently processing the pinhole on box and end cover causes the bearing of output end and the axiality of the mounting hole in the gear box relatively poor easily to and the oil blanket is relatively poor scheduling problem with the axiality of axle. Poor axiality of bearing and mounting hole can cause bearing radial play less, appears the negative play even, causes the dead inefficacy of bearing card. Poor axiality of oil blanket and axle can cause the sealed inefficacy of oil blanket, leads to the oil leak.

Therefore, a gear box and a twin-screw extruder are required to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a gear box and a double-screw extruder, which are used for improving the coaxiality of a bearing and an oil seal with corresponding mounting holes in the gear box and improving the reliability of the bearing and the oil seal.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

a gearbox, comprising:

the box body is internally provided with a first mounting hole and a second mounting hole, and the output end of the box body is provided with a first inner spigot;

the end part of the end cover facing the box body is provided with a first outer spigot; the end cover is arranged at the output end of the box body, and the first inner spigot is in plug fit with the first outer spigot;

the first shaft system comprises a first shaft, a first bearing and a first oil seal, the first shaft penetrates through the first mounting hole and penetrates out of the end cover, the first shaft is mounted in the end cover through the first bearing, and the first oil seal is mounted in the end cover and sleeved on the first shaft; and

and the second shaft system comprises a second shaft, a second bearing and a second oil seal, the second shaft penetrates through the second mounting hole and penetrates out of the end cover, the second shaft is mounted in the box body through the second bearing, and the second oil seal is mounted in the end cover and sleeved on the first shaft.

As a preferred scheme, the output end of the box body is inwards recessed to form the first inner spigot, and the first mounting hole and the second mounting hole are respectively communicated with the first inner spigot.

As a preferred scheme, the first inner seam allowance is provided with a first arc section and a second arc section, the first arc section is concentrically arranged at the output end of the box body along the circumferential direction of the first mounting hole, and the second arc section is concentrically arranged along the circumferential direction of the second mounting hole;

the first outer spigot comprises a first positioning ring and a second positioning ring, the first positioning ring is concentric with the first arc section and is installed in a matched mode with the first arc section, and the second positioning ring is concentric with the second arc section and is installed in a matched mode with the second arc section.

Preferably, the central angles of the first positioning ring and the second positioning ring are less than or equal to 180 °.

Preferably, the end cap includes:

the output end of the box body is provided with the transparent cover, the first axial end of the transparent cover is provided with the first outer spigot, and the second axial end of the transparent cover is provided with the second inner spigot; and

the gland, the medial surface of gland has the outer tang of second, pass through the second end of lid and install the gland, the tang with the outer tang of second is pegged graft and is cooperated in the second.

As a preferred scheme, the transparent cover is provided with a third mounting hole and a fourth mounting hole, and the gland is provided with a fifth mounting hole and a sixth mounting hole which are communicated with each other and a seventh mounting hole and an eighth mounting hole which are connected with each other;

the first shaft is arranged in the third mounting hole through the first bearing and penetrates out of the sixth mounting hole, and the first oil seal is arranged in the fifth mounting hole;

the second shaft penetrates through the fourth mounting hole and the seventh mounting hole in sequence and penetrates out of the eighth mounting hole, and the second oil seal is mounted in the eighth mounting hole.

Preferably, the second end of the transparent cover is recessed inwards to form the second inner spigot, and the third mounting hole and the fourth mounting hole are respectively communicated with the second inner spigot.

As a preferred scheme, the second inner spigot has a third arc section and a fourth arc section, the gland is concentrically provided with the third arc section along the circumferential direction of the third mounting hole and concentrically provided with the fourth arc section along the circumferential direction of the fourth mounting hole;

the second outer spigot includes a third positioning ring and a fourth positioning ring, the third positioning ring with the third circular arc segment is concentric and with the third circular arc segment is installed in a matched mode, the fourth positioning ring with the fourth circular arc segment is concentric and with the fourth circular arc segment is installed in a matched mode.

Preferably, the central angle of the third positioning ring corresponding to the central angle of the fourth positioning ring is less than or equal to 180 °.

A double-screw extruder comprises the gear box.

The beneficial effects of the utility model are as follows:

according to the gear box provided by the utility model, the output end of the box body is provided with the first inner spigot, the end cover is provided with the first outer spigot, and the accurate contraposition installation of the box body and the end cover is realized through the insertion and matching of the first inner spigot and the first outer spigot, so that the coaxiality of the first bearing, the first oil seal and the second oil seal with corresponding installation holes in the gear box is ensured, the clamping failure caused by small radial clearance of the first bearing is avoided, meanwhile, the sealing failure of the first oil seal and the second oil seal can be avoided, the sealing performance of the first oil seal and the second oil seal is improved, and the oil leakage at the end cover is avoided. The gearbox can realize accurate alignment of the box body, the end cover, the first shaft system and the second shaft system, improves the installation precision, and is beneficial to prolonging the service life of the first bearing, the first oil seal and the second oil seal.

According to the double-screw extruder, the gear box is adopted, so that the box body and the end cover are accurately installed in a contraposition mode, the coaxiality of the first bearing, the first oil seal and the second oil seal with corresponding installation holes in the gear box is guaranteed, the first bearing is prevented from being clamped and losing efficacy due to small radial play, meanwhile, the first oil seal and the second oil seal can be prevented from losing efficacy, the sealing performance of the first oil seal and the second oil seal is improved, and oil leakage at the end cover is avoided. The gearbox can realize accurate alignment of the box body, the end cover, the first shaft system and the second shaft system, improves the installation precision, and is beneficial to prolonging the service life of the first bearing, the first oil seal and the second oil seal.

Drawings

FIG. 1 is a schematic view of a partial structure of a gearbox provided by an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a gearbox provided by an embodiment of the present invention;

FIG. 3 is a sectional view of an assembled structure of a case and an end cover according to an embodiment of the present invention;

FIG. 4 is a first schematic structural diagram of a transparent cover according to an embodiment of the present invention;

FIG. 5 is a second schematic structural view of a transparent cover according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a gland provided in an embodiment of the present invention.

The component names and designations in the drawings are as follows:

1. a box body; 11. a first mounting hole; 12. a second mounting hole; 13. a first inner spigot; 131. a first arc segment; 132. a second arc segment;

2. an end cap; 21. a transparent cover; 211. a first male end; 2111. a first positioning ring; 2112. a second positioning ring; 212. a second inner seam allowance; 2121. a third arc segment; 2122. a fourth arc segment; 213. a third mounting hole; 214. a fourth mounting hole; 22. a gland; 221. a second outer seam allowance; 2211. a third positioning ring; 2212. a fourth retaining ring; 222. a fifth mounting hole; 223. a sixth mounting hole; 224. a seventh mounting hole; 225. an eighth mounting hole;

31. a first shaft; 32. a first bearing; 33. a first oil seal; 41. a second shaft; 42. a second bearing; 43. and a second oil seal.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1-3, the present embodiment discloses a gearbox, which includes a box body 1, an end cover 2, a first shaft system and a second shaft system, wherein a first mounting hole 11 and a second mounting hole 12 are formed in the box body 1, the end cover 2 is mounted at an output end of the box body 1, the first shaft system includes a first shaft 31, a first bearing 32 and a first oil seal 33, the first shaft 31 penetrates through the first mounting hole 11 and penetrates out of the end cover 2, the first shaft 31 is mounted in the end cover 2 through the first bearing 32, and the first oil seal 33 is mounted in the end cover 2 and sleeved on the first shaft 31. The second shaft system comprises a second shaft 41, a second bearing 42 and a second oil seal 43, the second shaft 41 penetrates through the second mounting hole 12 and penetrates out of the end cover 2, the second shaft 41 is mounted in the box body 1 through the second bearing 42, and the second oil seal 43 is mounted in the end cover 2 and sleeved on the first shaft 31.

At present, when the gear box is assembled, pin holes are arranged on the end cover 2 and the box body 1 for positioning. But the processing efficiency of matching pin holes is lower and the cost is higher. However, the position deviation of the pin holes separately processed in the end cover 2 and the case 1 is likely to cause poor coaxiality between the first bearing 32, the first oil seal 33, and the second oil seal 43 and the mounting holes in the end cover 2, that is, poor coaxiality between the first oil seal 33 and the first shaft 31, and poor coaxiality between the second oil seal 43 and the second shaft 41, which are likely to cause the seizure failure of the first bearing 32 and the sealing failure of the first oil seal 33 and the second oil seal 43, and the oil leakage of the end cover 2 occurs.

For solving the above-mentioned problem, the output of the box 1 of this embodiment has first inner spigot 13, end cover 2 has first outer spigot 211 towards the tip of box 1, spigot 13 and the cooperation of pegging graft of first outer spigot 211 in first, the accurate counterpoint installation of box 1 with end cover 2 has been realized, thereby first bearing 32 has been guaranteed, first oil blanket 33 and second oil blanket 43 correspond the axiality of mounting hole in with the gear box respectively, avoid the less emergence card of radial play of first bearing 32 to die the inefficacy, can avoid the sealed inefficacy of first oil blanket 33 and second oil blanket 43 simultaneously, the sealing performance of first oil blanket 33 and second oil blanket 43 has been improved, avoid end cover 2 department to take place the oil leak. This gear box can realize the accurate counterpoint of box 1, end cover 2, first shafting and second shafting, has improved the installation accuracy, is favorable to prolonging the life of first bearing 32, first oil blanket 33 and second oil blanket 43.

As shown in fig. 1 to 4, the output end of the box body 1 is recessed inwards to form a first inner stop 13, and the first mounting hole 11 and the second mounting hole 12 are respectively communicated with the first inner stop 13. The first inner spigot 13 is provided with a first arc segment 131 and a second arc segment 132, and the output end of the box body 1 is concentrically provided with the first arc segment 131 along the circumferential direction of the first mounting hole 11 and the second arc segment 132 along the circumferential direction of the second mounting hole 12. The first male end 211 comprises a first positioning ring 2111 and a second positioning ring 2112, the first positioning ring 2111 is concentric with the first arc segment 131 and is installed in cooperation with the first arc segment 131, and the second positioning ring 2112 is concentric with the second arc segment 132 and is installed in cooperation with the second arc segment 132.

Specifically, the first inner seam allowance 13 is a gourd-shaped groove, and a first arc segment 131 and a second arc segment 132 are respectively arranged at two ends of the first inner seam allowance 13 along the long axis direction. When the end cover 2 is assembled with the box body 1, the outer wall of the first positioning ring 2111 is attached to the inner wall of the first arc segment 131, and the outer wall of the second positioning ring 2112 is attached to the inner wall of the second arc segment 132, so that accurate alignment of the end cover 2 and the box body 1 is realized. Then end cover 2 passes through bolt fixed connection with box 1, makes things convenient for the dismouting of end cover 2 to change.

It should be noted that the central angles of the first positioning ring 2111 and the second positioning ring 2112 are all less than or equal to 180 °, so that the over-positioning of the first inner stop 13 and the first outer stop 211 can be avoided, the processing amount of the first positioning ring 2111 and the second positioning ring 2112 can be reduced, and the processing difficulty of the end cover 2 can be reduced. It can be understood that the first arc segment 131 has the same arc length as the first positioning ring 2111, and the second arc segment 132 has the same arc length as the second positioning ring 2112, that is, the central angles of the first arc segment 131 and the second arc segment 132 are both less than or equal to 180 °.

As shown in fig. 2 to 4, the second bearing 42 of the present embodiment is installed in the housing 1, and the first bearing 32 is installed in the end cover 2, so that the first bearing 32 and the second bearing 42 are installed in a staggered manner in the axial direction. Likewise, the first oil seal 33 and the second oil seal 43 are installed in the end cover 2 in a staggered mode along the axial direction, so that the first shaft system and the second shaft system are compactly installed to adapt to the condition that the center distance between the two shaft systems is small.

In order to facilitate replacement and installation of the first oil seal 33 and the second oil seal 43 and reduce the difficulty in dismounting the end cover 2, as shown in fig. 2 and 3, the end cover 2 of the present embodiment adopts a split design, and specifically includes a transparent cover 21 and a gland 22, the transparent cover 21 is installed at the output end of the box body 1, the first axial end of the transparent cover 21 has a first outer spigot 211, and the second axial end of the transparent cover 21 has a second inner spigot 212. The end face of the inner side of the gland 22 is provided with a second outer spigot 221, the gland 22 is installed at the second end of the transparent cover 21, and the second inner spigot 212 is in plug-in fit with the second outer spigot 221.

Specifically, the transparent cover 21 has a third mounting hole 213 and a fourth mounting hole 214, and the pressing cover 22 has a fifth mounting hole 222 and a sixth mounting hole 223 communicated with each other and a seventh mounting hole 224 and an eighth mounting hole 225 connected to each other. The first shaft 31 is mounted in the third mounting hole 213 via the first bearing 32, and passes through the sixth mounting hole 223, and the first oil seal 33 is mounted in the fifth mounting hole 222. The second shaft 41 is sequentially inserted into the fourth mounting hole 214 and the seventh mounting hole 224, and is inserted through the eighth mounting hole 225, and the second oil seal 43 is mounted in the eighth mounting hole 225.

In the present embodiment, the left end of the first bearing 32 is positioned by the stop shoulder of the first shaft 31 and the stop shoulder of the through cover 21, and the right end of the first bearing 32 is positioned by the second external spigot 221 of the gland 22, so that the axial positioning of the first bearing 32 is realized.

As shown in fig. 5 and 6, the second end of the transparent cover 21 is recessed inward to form a second inner spigot 212, and the third mounting hole 213 and the fourth mounting hole 214 communicate with the second inner spigot 212, respectively. The second female end 212 has a third circular arc section 2121 and a fourth circular arc section 2122, and the gland 22 is concentrically provided with the third circular arc section 2121 along the circumferential direction of the third mounting hole 213 and the fourth circular arc section 2122 along the circumferential direction of the fourth mounting hole 214. The second outer stop 221 comprises a third positioning ring 2211 and a fourth positioning ring 2212, the third positioning ring 2211 is concentric with and is mounted in cooperation with the third arc segment 2121, and the fourth positioning ring 2212 is concentric with and is mounted in cooperation with the fourth arc segment 2122.

Specifically, the second inner seam allowance 212 has the same structure as the first inner seam allowance 13, and is a gourd-shaped groove, and both ends of the second inner seam allowance 212 in the long axis direction are respectively provided with a third arc section 2121 and a fourth arc section 2122. When the transparent cover 21 is assembled with the gland 22, the outer wall of the third positioning ring 2211 is attached to the inner wall of the third arc segment 2121, and the outer wall of the fourth positioning ring 2212 is attached to the inner wall of the fourth arc segment 2122, so that the transparent cover 21 and the gland 22 are accurately aligned. Then the transparent cover 21 is fixedly connected with the pressing cover 22 through bolts, so that the pressing cover 22 is convenient to disassemble, assemble and replace, and the first oil seal 33 and the second oil seal 43 are convenient to replace quickly.

It should be noted that the central angles of the third positioning ring 2211 and the fourth positioning ring 2212 are all less than or equal to 180 °, so that the over-positioning of the second inner stop 212 and the second outer stop 221 can be avoided, the processing amount of the third positioning ring 2211 and the fourth positioning ring 2212 can be reduced, and the processing difficulty of the gland 22 can be reduced. It will be appreciated that the arc length of the third arc segment 2121 is the same as that of the third positioning ring 2211, and the arc length of the fourth arc segment 2122 is the same as that of the fourth positioning ring 2212, i.e. the central angles of the third arc segment 2121 and the fourth arc segment 2122 are both less than or equal to 180 °.

The embodiment also discloses a double screw extruder, double screw extruder is through adopting above-mentioned gear box, the accurate counterpoint installation of box 1 and end cover 2 has been realized, thereby the axiality of first bearing 32 and primary shaft 31 and third mounting hole 213, the axiality of first oil blanket 33 and primary shaft 31 and fifth mounting hole 222 and the axiality of second oil blanket 43 and secondary shaft 41 and eighth mounting hole 225 have been guaranteed, the less card that takes place of radial play of first bearing 32 dies the inefficacy, can avoid first oil blanket 33 and the sealed inefficacy of second oil blanket 43 simultaneously, the sealing performance of first oil blanket 33 and second oil blanket 43 has been improved, avoid end cover 2 department to take place the oil leak. This gear box can realize the accurate counterpoint of box 1, end cover 2, first shafting and second shafting, has improved the installation accuracy, is favorable to prolonging the life of first bearing 32, first oil blanket 33 and second oil blanket 43.

The foregoing embodiments are merely illustrative of the principles and features of this invention, and the utility model is not limited to the embodiments described above, but rather, is susceptible to various changes and modifications without departing from the spirit and scope of the utility model, as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A gearbox, comprising:

the box body (1) is internally provided with a first mounting hole (11) and a second mounting hole (12), and the output end of the box body (1) is provided with a first inner spigot (13);

an end cover (2), wherein the end part of the end cover (2) facing the box body (1) is provided with a first outer spigot (211); the end cover (2) is arranged at the output end of the box body (1), and the first inner spigot (13) is in plug-in fit with the first outer spigot (211);

the first shaft system comprises a first shaft (31), a first bearing (32) and a first oil seal (33), the first shaft (31) penetrates through the first mounting hole (11) and penetrates out of the end cover (2), the first shaft (31) is mounted in the end cover (2) through the first bearing (32), and the first oil seal (33) is mounted in the end cover (2) and sleeved on the first shaft (31); and

the second shaft system comprises a second shaft (41), a second bearing (42) and a second oil seal (43), the second shaft (41) penetrates through the second mounting hole (12) and penetrates out of the end cover (2), the second shaft (41) is mounted in the box body (1) through the second bearing (42), and the second oil seal (43) is mounted in the end cover (2) and sleeved on the first shaft (31).

2. Gearbox according to claim 1, in which the output end of the box (1) is recessed inwards to form the first internal spigot (13), the first mounting hole (11) and the second mounting hole (12) communicating with the first internal spigot (13), respectively.

3. The gearbox according to claim 2, characterized in that the first inner spigot (13) has a first circular arc section (131) and a second circular arc section (132), the first circular arc section (131) is concentrically arranged at the output end of the box body (1) along the circumferential direction of the first mounting hole (11) and the second circular arc section (132) is concentrically arranged along the circumferential direction of the second mounting hole (12);

first tang (211) includes first holding ring (2111) and second holding ring (2112), first holding ring (2111) with first circular arc section (131) is concentric and with first circular arc section (131) cooperation installation, second holding ring (2112) with second circular arc section (132) is concentric and with second circular arc section (132) cooperation installation.

4. A gearbox according to claim 3, characterised in that the central angles of correspondence of the first retaining ring (2111) and the second retaining ring (2112) are each less than or equal to 180 °.

5. Gearbox according to claim 1, in which the end cover (2) comprises:

the through cover (21) is mounted at the output end of the box body (1), the first axial end of the through cover (21) is provided with the first outer spigot (211), and the second axial end of the through cover (21) is provided with the second inner spigot (212); and

the gland (22), the medial surface of gland (22) has second outer tang (221), pass through the second end of lid (21) and install gland (22), tang (212) with the cooperation of pegging graft of second outer tang (221).

6. The gearbox according to claim 5, characterized in that the transparent cover (21) has a third mounting hole (213) and a fourth mounting hole (214), the gland (22) has a fifth mounting hole (222) and a sixth mounting hole (223) which are communicated with each other and a seventh mounting hole (224) and an eighth mounting hole (225) which are connected with each other;

the first shaft (31) is installed in the third installation hole (213) through the first bearing (32) and penetrates out of the sixth installation hole (223), and the first oil seal (33) is installed in the fifth installation hole (222);

the second shaft (41) penetrates through the fourth mounting hole (214) and the seventh mounting hole (224) in sequence and penetrates out of the eighth mounting hole (225), and the second oil seal (43) is mounted in the eighth mounting hole (225).

7. The gearbox according to claim 6, characterized in that the second end of the transparent cover (21) is recessed inwardly to form the second inner spigot (212), and the third mounting hole (213) and the fourth mounting hole (214) communicate with the second inner spigot (212), respectively.

8. The gearbox according to claim 7, characterized in that the second inner spigot (212) has a third circular arc section (2121) and a fourth circular arc section (2122), the gland (22) is concentrically provided with the third circular arc section (2121) in a circumferential direction of the third mounting hole (213) and with the fourth circular arc section (2122) in a circumferential direction of the fourth mounting hole (214);

the second outer seam allowance (221) comprises a third positioning ring (2211) and a fourth positioning ring (2212), the third positioning ring (2211) is concentric with the third circular arc segment (2121) and is mounted in a matched mode with the third circular arc segment (2121), and the fourth positioning ring (2212) is concentric with the fourth circular arc segment (2122) and is mounted in a matched mode with the fourth circular arc segment (2122).

9. Gearbox according to claim 8, characterised in that the central angle of correspondence of the third positioning ring (2211) with the fourth positioning ring (2212) is less than or equal to 180 °.

10. A twin screw extruder comprising a gearbox according to any one of claims 1 to 9.

Images