CN212389512U

CN212389512U - Fixed-shaft single-screw pump and coal mining machine rocker arm comprising same

Info

Publication number: CN212389512U
Application number: CN202021966615.7U
Authority: CN
Inventors: 王跃清; 张文琦; 刘国强; 高宇
Original assignee: Zhengzhou Coal Machinery Intelligent Working Face Technology Co ltd
Current assignee: Zhengzhou Coal Machinery Intelligent Working Face Technology Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-01-22
Anticipated expiration: 2030-09-10

Abstract

The utility model relates to a dead axle single screw pump and contain coal-winning machine rocking arm of this pump belongs to hydraulic transmission technical field, and dead axle single screw pump includes the pump case and is located the inside screw rod of pump case, the periphery of pump case is connected with drive gear, and drive gear and pump case synchronous revolution, the pump case is stirred the screw rod and is not only revolved round the axis rotation of screw rod but also round the axis gyration of pump case, the utility model discloses a pump case external rotor subassembly and screw rod cooperation are concentrated the position pump sending to the starved oil position by excessive lubricating oil, are improved the lubricated situation at starved oil position, alleviate the lubricating oil and concentrate invalid oil stirring, consumption and generate heat that excessive caused, simultaneously, can healthy idle running under the starved oil state, consume few power and avoid self lubricated bad damage.

Description

Fixed-shaft single-screw pump and coal mining machine rocker arm comprising same

Technical Field

The utility model belongs to the technical field of hydraulic transmission, specifically speaking relates to a dead axle single-screw pump and contain coal-winning machine rocking arm of this pump.

Background

The rocker arm of underground coal mining machine is composed of a chain of gears including speed reducer reducing gear and distance-increasing transition gear, and its two ends can be divided into high-speed zone and low-speed zone. When the rocker arm works, the rocker arm lifts and downward probes to work, lubricating oil flows down and is concentrated to the high-speed cavity, the oil quantity of the high-speed cavity is too much, the low-speed area is lack of oil, when the rocker arm works, the lubricating oil flows down and is concentrated to the low-speed cavity, the oil quantity of the low-speed cavity is too much, and the high-speed area is lack of oil. How to improve the bearing gear lubrication of the oil-deficient part and reduce the problems of ineffective oil stirring, power consumption, heat generation and the like caused by the concentrated excess of lubricating oil is a problem which needs to be solved urgently by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, a fixed-axis single-screw pump and a coal mining machine rocker arm including the same are proposed.

In order to achieve the above object, the utility model provides a following technical scheme:

a fixed-shaft single-screw pump comprises a pump shell and a screw rod positioned in the pump shell, wherein a driving gear is connected to the periphery of the pump shell, the driving gear and the pump shell rotate synchronously, and the screw rod is stirred by the pump shell to rotate around the axis of the screw rod and rotate around the axis of the pump shell.

Furthermore, the driving gear is arranged on the gear bearing seat, and the driving gear is meshed with an external power source.

Furthermore, the pump shell is of a split structure, two ends of the pump shell are respectively connected with an end cover, and the end covers are fixedly connected with the gear bearing seat to form an outer rotor assembly of the pump shell.

Further, the end cover is made of self-lubricating materials.

Furthermore, two ends of the pump shell outer rotor assembly are respectively supported on the end cover bearing seat through the first bearing.

Furthermore, two ends of the screw rod respectively penetrate through the end covers and are supported on the end cover bearing seats through second bearings, and long round holes for the screw rod to rotate in a sliding and rolling mode are formed in the end covers.

Further, the helicoid of the screw is a single-head helix, and the helicoid of the pump shell is a double-head helix.

Further, the screw lead of the pump housing is 2 times the screw lead of the screw.

Furthermore, cavities are formed between the screw rod and different spiral surfaces of the pump shell to form oil seal cavities, and oil inlet channels and oil outlet channels communicated with the oil seal cavities are formed in end cover bearing seats at two ends of the screw rod respectively.

Additionally, the utility model provides a coal-winning machine rocking arm, include dead axle single screw pump, the dead axle screw pump is located the high-speed district and the low-speed district of rocking arm respectively, and drive gear meshes with the gear in high-speed district, the gear in low-speed district respectively mutually.

The utility model has the advantages that:

through pump case external rotor subassembly and screw rod cooperation, with lubricating oil by excessive concentrated position pump sending to the position of lacking oil, improve the lubricated situation at the position of lacking oil, alleviate the concentrated excessive invalid oil stirring, the consumption that causes of lubricating oil and generate heat, simultaneously, can healthy idle running under the oil-deficient state, consume few power and avoid self lubricated bad damage.

Drawings

FIG. 1 is a schematic longitudinal cross-sectional view of a fixed-axis single-screw pump;

fig. 2 is a schematic view of the assembly of a fixed-axis single-screw pump with a shearer loader arm.

In the drawings: 1-screw, 2-pump shell, 3-end cover, 4-first bearing, 5-second bearing, 6-sealing retainer ring, 7-end cover, 8-gear bearing seat, 9-end cover bearing seat, 10-end cover bearing seat, 11-oil inlet channel, 12-oil outlet channel, 13-rocker arm shell and 14-rocker arm gear.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following description, together with the drawings of the present invention, clearly and completely describes the technical solution of the present invention, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without creative efforts shall all belong to the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustration and not for limitation of the present invention.

The first embodiment is as follows:

as shown in fig. 1, a fixed-axis single-screw pump includes a pump housing 2 and a screw 1 located inside the pump housing 2, the pump housing 2 is a split structure, in this embodiment, the pump housing 2 is divided into two parts with the same structure, and can be precisely processed by CNC, so as to improve the precision, realize precise transmission, and do not need to be compensated by a rubber layer due to insufficient processing precision, that is, the pump housing 2 does not contain a rubber layer.

The periphery of the pump shell 2 is connected with a driving gear, specifically, two ends of the pump shell 2 are respectively connected with an end cover 3 and an end cover 7, preferably, the pump shell 2 is connected with the end cover 3 and the end cover 7 through bolts, and the end cover 3 and the end cover 7 are made of self-lubricating materials and do not need oil flowing lubrication. The periphery of the end cover 7 is fixedly connected with the gear bearing seat 8 to form a pump shell outer rotor assembly, and preferably, the end cover 7 is connected with the gear bearing seat 8 through bolts. Meanwhile, the gear bearing seat 8 is fixedly connected with a driving gear, and the driving gear is meshed with an external power source. That is, under the driving action of the external power source, the driving gear and the pump casing 2 rotate synchronously, that is, the outer rotor assembly of the pump casing rotates. In addition, one end of the pump casing outer rotor assembly is supported on the end cover bearing seat 9 through the first bearing 4, and the other end of the pump casing outer rotor assembly is supported on the end cover bearing seat 10 through the first bearing, namely, the pump casing outer rotor assembly can rotate relative to the end cover bearing seat 10 and the end cover bearing seat 9. Meanwhile, a sealing retainer ring 6 is arranged between the end cover 3 and the end cover bearing seat 9 and on the outer side of the first bearing 4 to play a role in sealing protection, and the outer side is the side far away from the pump shell 2.

One end of the screw 1 penetrates through the end cover 3 and is supported on the end cover bearing seat 9 through the second bearing 5, the other end of the screw penetrates through the end cover 7 and is supported on the end cover bearing seat 10 through the second bearing, namely the screw 1 can rotate relative to the end cover bearing seat 10 and the end cover bearing seat 9, meanwhile, the end cover 3 and the end cover 7 are provided with long round holes, and the screw 1 can rotate in a sliding and rolling mode relatively in the long round holes to form end transmission. The pump casing 2 stirs the screw 1 to rotate around the axis of the screw 1 and rotate around the axis of the pump casing 2 (the axis of the pump casing 2 is overlapped with the axis of the outer rotor component of the pump casing), so as to form middle transmission, namely, the rotation axis of the pump casing 2 and the rotation axis of the screw 1 are fixed without universal coupling, and the length of the fixed-axis single-screw pump is greatly shortened. The spiral surface of the screw rod 1 is a single-head spiral, the spiral surface of the pump shell 2 is a double-head spiral, and the spiral lead of the pump shell 2 is 2 times of the spiral lead of the screw rod 1. A cavity is formed between different spiral surfaces of the screw rod 1 and the pump shell 2 to form an oil seal cavity, and an oil inlet channel 11 and an oil outlet channel 12 communicated with the oil seal cavity are respectively formed on end cover bearing seats (namely an end cover bearing seat 10 and an end cover bearing seat 9) at two ends of the screw rod 1, so that the structure is compact.

To sum up, the transmission mechanism of the dead axle single screw pump has two sets, namely, end transmission and middle transmission. The end part transmission mainly focuses on dry working conditions (namely oil-less working conditions), the dry working conditions only have low-power consumption transmission at two ends, and the middle part relative sliding and rolling part has a cavity and a gap and is not in contact with the middle part substantially. Under all working conditions, the end part is in complete mechanical transmission, and the middle part is in dynamic pressure oil film transmission. The design of dry working condition ensures that the fixed-shaft single-screw pump runs empty in an oil-deficient state, consumes little power and avoids oil-deficient idle running damage.

When the oil pump works, an external power source inputs power, the pump shell outer rotor assembly and the screw rod 1 rotate, the screw rod 1 rotates in the pump shell 2, the volume of an oil seal cavity in the middle is unchanged, only the oil seal cavity is conveyed in a spiral mode, the volume of the oil seal cavity close to the oil inlet channel 11 and the oil outlet channel 12 changes periodically, and lubricating oil is sucked and discharged periodically. That is, under the action of an external power source, the volumes of the oil seal cavities near the oil inlet passage 11 and the oil outlet passage 12 are periodically increased and decreased to realize the suction and discharge of the lubricating oil, and the oil seal cavity in the middle portion transfers the lubricating oil to pump the lubricating oil to a destination. Compare in the oil pump that prior art used and adopt the helicoid transmission to send oil, lubricating oil is direct with the oil bath, and pure spiral power oil feeding is very low in efficiency, can not effective oil supply, the utility model discloses a fixed-axis single-screw pump belongs to the positive displacement pump, presses oil by the volume change, and is efficient.

Example two:

as shown in fig. 1 and 2, the rocker arm of the coal mining machine comprises a fixed-shaft single-screw pump, the fixed-shaft single-screw pump is respectively positioned in a high-speed area and a low-speed area of the rocker arm, a driving gear is respectively meshed with a rocker arm gear 14, and the rocker arm gear is a gear in the high-speed area or a gear in the low-speed area. That is, the high-speed area and the low-speed area of the rocker arm are installed at the same time, and the working state is intelligently and automatically selected. One part of the lubricating oil at the excessive concentrated part is pumped to the other oil-deficient part, so that the lubrication of a bearing gear at the oil-deficient part is improved, and the ineffective oil stirring, power consumption and heat generation caused by the concentrated excessive lubricating oil are reduced. The oil inlet channel is directly communicated with the oil pool, and the oil outlet channel is communicated with the parts needing to be lubricated, such as bearings, gears and the like of the rocker arm of the coal mining machine through the processing oil duct on the rocker arm shell 13. The oil discharged from the fixed-shaft single-screw pump in the high-speed area finally flows to the part needing to be lubricated in the low-speed area, and the oil discharged from the fixed-shaft single-screw pump in the low-speed area finally flows to the part needing to be lubricated in the high-speed area.

In the prior art, a single-screw pump is mostly provided with universal joints, meanwhile, the power of the single-screw pump is driven by a self-contained motor, the axial direction is very long, the single-screw pump is not suitable for narrow spaces of rocker arms, in addition, the screw rotates around an indefinite axis, eccentric dynamic load exists, the work is severe, a pump shell cannot be finely processed, a rubber inner sleeve is generally added, the resistance is very large, and the pump shell is easy to damage. The utility model discloses a dead axle single screw pump drives the operation by the inside gear of rocking arm (the gear in high-speed district, the gear in low-speed district), and divide the small part power drive dead axle single screw pump can, do not need special motor, simultaneously, the pump case is split type structure, but fine machining, the precision is very high, pump case external rotor subassembly and screw rod meshing transmission to realize near meshing line liquid film transmission, the pump case had not both not had contact wear with the screw rod, can effectively seal oil again. In addition, general single screw pump can not lack oily idle running, and the utility model discloses a fixed axis single screw pump can healthy idle running under the starved condition owing to have cavity and clearance between the different helicoids of screw 1 and pump case 2, consumes few power and avoids the bad damage of self lubrication.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, i.e. the present invention is intended to cover all equivalent variations and modifications within the scope of the present invention.

Claims

1. The utility model provides a dead axle single-screw pump, includes pump case and is located the inside screw rod of pump case, its characterized in that:

the periphery of the pump shell is connected with a driving gear, the driving gear and the pump shell rotate synchronously, and the pump shell drives the screw to rotate around the axis of the screw and rotate around the axis of the pump shell.

2. A fixed axis progressive cavity pump as claimed in claim 1 wherein the drive gear is mounted on a gear bearing mount and the drive gear is in mesh with an external power source.

3. The fixed-shaft single-screw pump according to claim 2, wherein the pump casing is a split structure, and two ends of the pump casing are respectively connected with an end cover, and the end covers are fixedly connected with the gear bearing base to form an outer rotor assembly of the pump casing.

4. A single-screw fixed-axis pump according to claim 3, wherein the end caps are made of a self-lubricating material.

5. A fixed axis single screw pump according to claim 3 or claim 4, wherein the pump casing outer rotor assembly is supported at each end by an end cap bearing mount via a first bearing.

6. The fixed-shaft single-screw pump according to claim 5, wherein both ends of the screw respectively penetrate through the end covers and are supported on the end cover bearing seats through second bearings, and the end covers are provided with oblong holes for the screw to rotate in a sliding and rolling manner.

7. A uniaxial single-screw pump according to claim 6, wherein the screw has a single-start helix and the pump has a double-start helix.

8. A fixed axis progressive cavity pump according to claim 7, wherein the screw lead of the pump housing is 2 times the screw lead of the screw.

9. The fixed-axis single-screw pump according to claim 8, wherein oil-sealed cavities are formed between the screw and different helicoids of the pump casing, and oil inlet passages and oil outlet passages communicated with the oil-sealed cavities are respectively formed on end cover bearing seats located at both ends of the screw.

10. A shearer-loader ranging arm comprising a fixed-axis single-screw pump according to any one of claims 1 to 9, wherein the fixed-axis single-screw pump is located in a high-speed region and a low-speed region of the ranging arm, and a drive gear is engaged with a gear in the high-speed region and a gear in the low-speed region.