CN217926736U - High-wear-resistance conical pin shaft - Google Patents

Abstract

The utility model relates to a high wearability tapered pin axle, its middle part is the cylinder structure, and both ends are the circular cone structure and are close to more that tip diameter is littleer, and its inside centre bore that is equipped with along axial extension, a tip of centre bore sets up to the screw hole, and another tip sets up to the countersunk head screw hole, and its base member adopts high strength alloy steel to make, and radial surface is equipped with the tungsten carbide coating, the surface hardness of tungsten carbide coating is 70-73HRC, and top layer bonding strength is greater than 69MPa, the round pin axle can adopt following step processing to form: blanking, rough turning, thermal refining, semi-finish turning, slotted hole processing, finish turning, laser cladding, grinding, slot processing and spraying of an antirust agent. The utility model discloses can solve original round pin axle easy corrosion, the wearability is poor, the low scheduling problem of surface hardness.

Description

High-wear-resistance conical pin shaft

Technical Field

The utility model relates to a round pin axle, this round pin axle is used for coal-winning machine rocking arm and traction part articulated department mutually.

Background

The rocker arm of the coal mining machine is hinged with the traction part by a pin shaft. When the rocker arm swings up and down in work, the rocker arm rotates relative to the pin shaft, the stress condition is very complex, and therefore the force transmitted to the pin shaft is also very large and complex. After the coal mine is used for a period of time, the pin shaft is often rusted and abraded on the surface obviously, the original interference fit between the shaft hole of the rocker arm and the pin shaft is changed into clearance fit, at the moment, the rocker arm can swing along with the up-and-down movement or the left-and-right movement with larger amplitude, the normal operation of a coal mining machine is seriously affected, and major production accidents such as deformation and fracture of the lug seats of the rocker arm and the lug seat of the traction part are easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high wearability toper round pin axle solves original round pin axle and easily corrodes, the wearability is poor, the low scheduling problem of surface hardness.

The utility model discloses a main technical scheme has:

the utility model provides a high wearability toper round pin axle, its middle part is the cylinder structure, and both ends are the circular cone frustum structure and are more close to the tip diameter littleer, and its inside is equipped with along axially extended centre bore, and an tip of centre bore sets up to the screw hole, and another tip sets up to countersunk screw hole, and its base member adopts high strength alloy steel to make, and radial outer surface is equipped with the tungsten carbide coating.

The material of the substrate is 18Cr2Ni4WA, and the surface hardness is 320-360HB.

The surface hardness of the tungsten carbide coating layer is 70-73HRC.

The tungsten carbide coating layer is formed by adopting a laser cladding technology, and the surface bonding strength of the tungsten carbide coating layer is greater than 69MPa.

The outer surface of the middle of the pin shaft is provided with one or more annular grooves extending along the circumferential direction, axial channels and radial channels which are communicated with each other are arranged in the pin shaft, the axial channels do not pass through the axis of the pin shaft, the number of the radial channels is the same as that of the annular grooves, the radial channels are in one-to-one correspondence with and communicated with the annular grooves, the inner ends of the radial channels are communicated with the axial channels, the outer ends of the radial channels are communicated with the annular grooves, two ends of each axial channel are opened on two end faces of the pin shaft, one end opening of each axial channel is provided with a pipe joint connector, and the other end opening is provided with a plug.

One axial passage is provided, and two radial passages and two annular grooves are provided respectively.

And threaded holes outside the central holes are also formed in the two end faces of the pin shaft.

The conical pin shaft can be processed by the following steps:

1) Blanking;

2) Roughly turning the outline of the shape;

3) Quenching and tempering;

4) Semi-finish turning of the radial outer surface;

5) Machining all grooves and holes, including a central hole and a threaded hole;

6) Finish turning of the radial outer surface;

7) Carrying out laser cladding on the radial outer surface of the conical pin shaft to form a tungsten carbide coating layer;

8) Grinding the surface after laser cladding to meet the roughness requirement;

9) Processing the annular groove to the final design requirement;

10 Washed and sprayed with rust inhibitors.

The number of cladding layers in step 7) is preferably three.

The thickness of the tungsten carbide coating layer in the step 7) is up to 2mm.

The utility model has the advantages that:

the tungsten carbide coating layer is arranged on the radial outer surface of the pin shaft, and the characteristics of high hardness and high wear resistance of the tungsten carbide coating layer are utilized, so that the anti-rusting and anti-wear capacity of the pin shaft is obviously improved, the service life of the pin shaft is prolonged, and the connection reliability between the rocker arm of the coal mining machine and the traction part is improved.

The utility model discloses adopt gear steel 18Cr2Ni4WA to make the base member of round pin axle for the first time, solved long-term coal-winning machine rocking arm installation with round pin axle base member hardness on the low side, the easy corrosion in surface and the poor problem of wearability, prolonged the life of round pin axle, promoted coal-winning machine steady operation's reliability.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the tapered pin.

Reference numerals: 1. a substrate; 2. a tungsten carbide coating layer; 3. an annular groove; 4. an axial channel; 5. a radial channel; 7. a central bore; 8. a threaded bore.

Detailed Description

As shown in fig. 1, the utility model discloses a high-wear-resistance tapered pin (may be referred to as a pin for short), wherein the middle part is in a cylinder structure, and the two end parts are in a truncated cone structure and the diameter of the end part is smaller as the end part is closer. A central hole 7 extending along the axial direction is formed in the pin shaft, the axis of the central hole coincides with the axis of the pin shaft, the central hole is used for allowing a screw/bolt to penetrate through, one end portion of the central hole is provided with a screw hole, and the other end portion of the central hole is provided with a countersunk head screw hole. The base body 1 of the pin shaft is made of high-strength alloy steel, and a tungsten carbide coating layer 2 is arranged on the radial outer surface of the base body. Because the tungsten carbide coating layer has high hardness and high wear resistance, the anti-rusting and anti-abrasion capability of the pin shaft can be obviously improved, the service life of the pin shaft is prolonged, and the connection reliability between the rocker arm and the traction part of the coal mining machine is improved.

The middle part of the pin shaft is matched with the shaft sleeve, and the shaft sleeve is fixedly arranged in an ear hole of a rocker arm ear seat of the rocker arm of the coal mining machine and directly bears the load transmitted by the rocker arm. The two ends of the pin shaft are used for being matched with taper sleeves installed in shaft holes of the traction part shell, and the pin shaft can be conveniently installed and fastened by adopting a tapered transition structure. The impact force applied to the rocker arm is firstly applied to the shaft sleeve, the shaft sleeve transmits the impact force to the tapered pin shaft, and the tapered pin shaft transmits the impact force to the traction part through the tapered sleeve.

Further, the material of the substrate is preferably gear steel 18Cr2Ni4WA, and the surface hardness is 320-360HB. The utility model discloses adopt this material to make the base member of round pin axle for the first time, solved long-term for installation of coal-winning machine rocking arm with round pin axle base member hardness on the low side, the easy corrosion in surface and the poor problem of wearability, prolonged the life of round pin axle, promoted coal-winning machine steady operation's reliability.

The surface hardness of the tungsten carbide coating layer is preferably 70-73HRC, and the tungsten carbide coating layer can strongly resist corrosion and abrasion.

The tungsten carbide coating layer is formed by adopting a laser cladding technology, and the surface bonding strength of the tungsten carbide coating layer is greater than 69MPa.

The outer surface of the middle of the pin shaft is provided with one or more annular grooves 3 extending along the circumferential direction, axial channels 4 and radial channels 5 which are communicated with each other are arranged in the pin shaft, the axial channels do not pass through the axis of the pin shaft, the number of the radial channels is the same as that of the annular grooves, the radial channels are in one-to-one correspondence with the annular grooves and are communicated with the annular grooves, the inner ends of the radial channels are communicated with the axial channels, and the outer ends of the radial channels are communicated with the annular grooves. Two ends of the axial channel are opened on two end faces of the pin shaft, an opening at one end is arranged to be a pipe joint connecting port, and an opening at the other end is provided with a plug. The annular groove, the axial channel and the radial channel form a built-in lubricating oil path, lubricating oil enters the oil path from one end of the axial channel through the pipe joint and then enters the annular groove through the radial channel, and oil entering the annular groove is used for lubricating the pin shaft and the shaft sleeve. The arrangement of the annular groove can ensure that a certain amount of oil liquid is reserved between the pin shaft and the shaft sleeve, so that dry friction is really relieved. And, compare with the structure that does not set up annular groove, set up annular groove and can increase the oily volume of crossing between round pin axle and the axle sleeve.

Typically there is one of said axial passages and preferably there are two of each of said radial passages and said annular recess (see figure 1). Typically the plurality of annular grooves may be axially uniformly distributed over the outer cylindrical surface of the cylindrical structure. The axial channel is preferably an eccentric channel parallel to the axis of the pin, and the radial channel is a linear channel with the shortest path from the axial channel to the outer cylindrical surface of the cylindrical structure.

And threaded holes 8 except the center hole are also formed in the two end faces of the pin shaft and are used for connecting the pin shaft and the taper sleeve.

The conical pin shaft can be processed by the following steps:

1) Blanking;

2) Roughly turning the outline of the shape;

3) Quenching and tempering;

4) Semi-finish turning of the radial outer surface (a cylindrical surface in the middle and conical surfaces at two ends, the same below);

5) Machining all slots and holes, such as a central hole, a threaded hole, an annular groove, a radial channel and an axial channel; this step can be done by machining in a machining center.

6) Finish turning of the radial outer surface;

7) Carrying out laser cladding on the radial outer surface of the conical pin shaft through laser cladding equipment to form a tungsten carbide coating layer;

8) Grinding the surface subjected to laser cladding by using a grinding machine to meet the requirement of roughness Ra1.6;

9) Processing the annular groove to the final design requirement;

10 Washing the pin shaft processed in the step 9) and spraying an antirust agent to obtain a finished product of the tapered pin shaft.

Further, in step 7), one or more of the following optimizations may be performed:

(1) The number of cladding layers is preferably three, and the thickness of the tungsten carbide cladding layer is 2mm. The technical parameters are controlled, so that the excellent tungsten carbide cladding material bonding performance and the excellent tungsten carbide cladding layer surface quality can be obtained, surface cracks are avoided, the consumed working hours are less, and the economical efficiency is good.

(2) And (3) avoiding the outer ends of the annular groove and the radial channel during cladding, and reprocessing the related slotted holes to meet the drawing requirements (roughness and size) after final cladding.

Claims (7)

1. The utility model provides a high wearability toper round pin axle which characterized in that: the middle part of the cylinder structure is in a cylinder structure, the diameter of the two end parts of the cylinder structure is smaller as the two end parts of the cylinder structure are closer to the end parts, a central hole extending along the axial direction is arranged in the cylinder structure, one end part of the central hole is arranged to be a screw hole, the other end part of the central hole is arranged to be a countersunk head screw hole, the matrix of the cylinder structure is made of high-strength alloy steel, and a tungsten carbide coating layer is arranged on the radial outer surface of the cylinder structure.

2. The high wear tapered pin of claim 1, further comprising: the material of the substrate is 18Cr2Ni4WA, and the surface hardness is 320-360HB.

3. The high wear tapered pin of claim 1, further comprising: the surface hardness of the tungsten carbide coating layer is 70-73HRC.

4. The high wear resistance tapered pin of claim 1, wherein: the tungsten carbide coating layer is formed by adopting a laser cladding technology, and the surface bonding strength of the tungsten carbide coating layer is greater than 69MPa.

5. The high wear tapered pin of claim 1, 2, 3 or 4, wherein: the outer surface of the middle of the pin shaft is provided with one or more annular grooves extending along the circumferential direction, the pin shaft is internally provided with axial channels and radial channels which are communicated with each other, the axial channels do not pass through the axis of the pin shaft, the number of the radial channels is the same as that of the annular grooves, the radial channels are in one-to-one correspondence with the annular grooves and are communicated with each other, the inner ends of the radial channels are communicated with the axial channels, the outer ends of the radial channels are communicated with the annular grooves, two ends of each axial channel are opened on two end surfaces of the pin shaft, one end opening of each axial channel is provided with a pipe joint connector, and the other end opening is provided with a plug.

6. The high wear tapered pin of claim 5, further comprising: one axial passage is provided, and two radial passages and two annular grooves are provided respectively.

7. The high wear tapered pin of claim 6, further comprising: and threaded holes outside the central holes are also formed in the two end faces of the pin shaft.

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