CN217709575U

CN217709575U - Circumferential local heating assembly for rod-shaped workpiece

Info

Publication number: CN217709575U
Application number: CN202221810019.9U
Authority: CN
Inventors: 宣成; 王胜; 舒向东; 方超群; 吕建东; 倪浙龙; 金鑫; 汪希; 汪文高
Original assignee: Hangzhou Ziqiang Chain Drive Co ltd
Current assignee: Hangzhou Ziqiang Chain Drive Co ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-11-01
Anticipated expiration: 2032-07-14

Abstract

The utility model relates to a work piece thermal treatment field specifically discloses a circumference local heating element for bar-shaped work piece. The circumferential local heating assembly comprises a heating unit, wherein the heating unit comprises a supporting part and a coil mounting part, and the supporting part is connected with the coil mounting part; the coil mounting part comprises an arc-shaped segment; the coil installation part is provided with an induction coil, and the induction coil extends along the coil installation part. The circumferential local heating assembly can circumferentially and locally heat the rod-shaped workpiece, so that local quenching and hardening are realized, and the requirements of the rod-shaped workpiece on the difference of mechanical properties in different directions of the circumferential surface are met.

Description

Circumferential local heating assembly for rod-shaped workpiece

Technical Field

The utility model relates to a work piece thermal treatment field especially relates to a circumference local heating element for bar-shaped work piece.

Background

In the mechanical sector, rod-shaped workpieces are frequently used, for example the usual pins, for connecting and driving. In working practice, the rod-shaped workpiece is easy to have the problems of integral bending deformation, surface abrasion and even fracture after long-term use. After comprehensive analysis, the main reasons for the problems are that the rod-shaped workpiece is subjected to single-side loading for a long time, the loading side is easy to wear and the like, cracks are easy to generate when the loading side deviates from the loading side, and the rod-shaped workpiece generates integral bending deformation under the action of bending moment with basically consistent directions.

Taking a pin shaft in a chain as an example for explanation, due to the special structure of the keybar, the pin shaft is taken as one of main bearing parts, and in the chain with unidirectional transmission, the bearing surface of the pin shaft is basically fixed. In order to prolong the service life of the chain, the pin shaft needs to be subjected to surface hardening treatment, and the common treatment process is quenching hardening. After surface hardening treatment, the pin shaft has higher static strength and wear resistance, but the brittleness of the pin shaft is also increased. When the chain bears load for a long time, particularly when the chain bears impact load frequently, surface cracks are easily generated on the surface of the pin shaft deviating from the bearing direction under the action of bending moment, the overall mechanical performance of the pin shaft is greatly weakened, and the overall service life of the chain is shortened.

In order to solve the problems, the applicant designs a partially quenched chain pin shaft, and the wear resistance and rigidity of the surface of the chain pin shaft are considered simultaneously by means of partially quenching the surface of the chain pin shaft. Specifically, as shown in fig. 1, the bearing part 11 on the circumferential surface of the chain pin shaft 1 is subjected to quenching and hardening treatment to enhance the wear resistance of the bearing surface; the non-bearing part 12 is not quenched, so that the non-bearing surface has better rigidity and can bear larger bending moment.

However, how to perform local quenching treatment on the pin shaft is a great difficulty, and particularly how to perform circumferential local heating range is difficult to realize by the conventional heating equipment and heating process.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a circumference local heating subassembly for bar-shaped work piece can carry out circumference local heating to bar-shaped work piece to realize local quench hardening, with the difference demand to mechanical properties of adaptation bar-shaped work piece on global not equidirectional.

In order to solve the technical problem, the utility model provides a technical scheme as follows: a circumferential localized heating assembly for a rod-shaped workpiece, comprising: the heating device comprises a heating unit, wherein the heating unit comprises a supporting part and a coil mounting part, and the supporting part is connected with the coil mounting part; the coil mounting part is arranged in an open loop manner and comprises arc-shaped sections arranged in a C shape; the coil installation part is provided with an induction coil, and the induction coil extends along the coil installation part.

The coil mounting part is enclosed into a heating area, when the heating treatment is carried out, the rod-shaped workpiece is placed in the heating space, and the induction coil is electrified to finish the heating operation of the rod-shaped workpiece. The arc-shaped heating space is enclosed by the arc-shaped sections, so that local heating can be performed in the circumferential direction of the rod-shaped workpiece, and local quenching and hardening can be realized, so that the requirements of the rod-shaped workpiece on the difference of mechanical properties in different circumferential directions can be met.

Preferably, the number of the supporting parts is two, and the coil mounting part is located between the two supporting parts.

Preferably, cooling channels are respectively arranged in the supporting part and the coil mounting part, and the cooling channels in the supporting part are communicated with the cooling channels in the coil mounting part.

When heating, the cooling channel can pour into the coolant into, avoids heating unit high temperature.

Preferably, the arcuate section is semi-circular.

Preferably, the two ends of the arc-shaped segment are respectively connected with a linear segment, the arc-shaped segment and the linear segment are respectively provided with an induction coil, and the induction coils on the arc-shaped segment and the linear segment work independently.

Preferably, the length L of the straight line segment and the radius R of the arc segment are L: r =0.2 to 0.4.

Different chain working modes are different, the angle of the side bearing part of the rod-shaped workpiece is also different, and the corresponding angle range needing quenching and hardening treatment is also different. When the angle range of the bar-shaped workpiece to be processed, which needs to be subjected to quenching and hardening treatment, is small, the induction coil corresponding to the arc-shaped segment can be used for heating; when the angle range of the bar-shaped workpiece to be processed, which needs to be subjected to quenching and hardening treatment, is large, the induction coils corresponding to the arc-shaped sections and the straight-line sections can be heated simultaneously. The heating requirements of rod-shaped workpieces of different models can be better met.

Preferably, the number of the coil mounting parts is at least two, and the coil mounting parts are distributed in parallel in the direction of the central line of the arc-shaped segment.

According to the length of the rod-shaped workpiece to be processed, the coils on the coil mounting parts with proper number are selected to be electrified, and the heating requirements of the rod-shaped workpieces with different lengths can be met.

Drawings

FIG. 1 is a schematic structural view of a chain pin for use in the circumferential localized heating assembly of a chain pin of the present embodiment;

FIG. 2 is a cross-sectional view of a chain pin for use in the circumferential localized heating assembly process of a chain pin of the present embodiment;

fig. 3 is a schematic structural view of a circumferential local heating assembly for a chain pin according to a first embodiment of the present invention;

fig. 4 is a working state diagram of the circumferential local heating assembly for the chain pin shaft according to the first embodiment of the present invention;

fig. 5 is a partial schematic view of a heating unit in the circumferential local heating assembly for the chain pin shaft according to the first embodiment of the present invention;

fig. 6 is a partial schematic view of a heating unit in a circumferential local heating assembly for a chain pin according to a second embodiment of the present invention;

fig. 7 is a schematic structural view of a circumferential local heating assembly for a chain pin according to a third embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example one

As shown in fig. 3-5, a circumferential localized heating assembly for a chain pin includes a mounting bracket 4 and a heating unit 2. Wherein the heating unit 2 comprises a supporting part 22 and a coil mounting part 21, one end of the supporting part 22 is connected with the coil mounting part 21, and the other end is connected with the mounting bracket 4. The coil mounting part 21 is provided with an induction coil, and the induction coil extends along the coil mounting part 21.

Specifically, as shown in fig. 3 to 5, the number of the supporting portions 22 is two, the coil mounting portion 21 is located between the two supporting portions 22, and the mounting member is located between the two supporting portions 22. The mounting pieces correspond to the supporting parts 22 one by one, and the insulating pieces 3 are arranged between the two mounting pieces.

As shown in fig. 3 and 5, the coil mounting portion is opened in the circumferential direction, and the coil mounting portion 21 includes an open loop, and the coil mounting portion includes an arc segment in a C-shaped configuration. Specifically, the arc-shaped segment 211 is semicircular.

The arcuate segments 211 of the coil mounting portion 21 may enclose an arcuate heating zone 23. When heating treatment is carried out, the chain pin shaft 1 is placed into the heating space from the circumferential opening of the coil mounting part, the induction coil is electrified to complete the heating operation of the chain pin shaft 1, and the length direction of the chain pin shaft 1 is basically parallel to the central line of the arc-shaped section 211 in the heating process. Since the heating section 23 is arc-shaped, only the chain pin 1 can be locally heated in the circumferential direction. And the relative position of the chain pin shaft 1 and the heating unit 2 is reasonably adjusted, so that the angle range of local heating can be adjusted within a certain range.

The chain pin shaft is axially and locally heated, so that circumferential local quenching and hardening of the chain pin shaft can be realized, and the requirement of the pin shaft on the difference of mechanical properties in different circumferential directions can be met.

Furthermore, cooling channels are respectively arranged in the supporting part 22 and the coil mounting part 21, and the cooling channels in the supporting part 22 are communicated with the cooling channels in the coil mounting part 21. When heating, the cooling channel can be filled with cooling liquid, so that the heating unit 2 is prevented from being overhigh in temperature.

Further, as shown in fig. 3 and 4, the mounting bracket 4 includes a mounting member, and the mounting member is provided with a slot. The mounting bracket 4 is used for connecting with a matched rack, and the arrangement of the insertion groove can be used for adjusting the position of the heating component relative to the rack.

Example two

As shown in fig. 6, compared with the first embodiment, the present embodiment is different in that: the two ends of the arc-shaped segment 211 are respectively connected with a straight segment 212, the arc-shaped segment 211 and the straight segment 212 are respectively provided with an induction coil, and the induction coils on the arc-shaped segment 211 and the straight segment 212 work independently. Specifically, if the length L of the straight-line segment 212 and the radius of the arc-shaped segment 211 are R, then L: r =0.2 to 0.4.

In view of different working modes of different types and models of chains, the angles of the bearing parts on the circumferential surfaces of the pin shafts of the chains are different, and the corresponding angle ranges needing quenching and hardening treatment are also different. When the angle range of the pin shaft to be processed, which needs to be subjected to quenching and hardening treatment, is small, the induction coil corresponding to the arc-shaped segment 211 can be used for heating; when the pin shaft to be processed needs to be subjected to quench hardening treatment in a large angle range, the induction coils corresponding to the arc-shaped segment 211 and the straight-line segment 212 can be heated simultaneously. Through the selective work of the arc-shaped section 211 and the straight-line section 212, the angle adjustment range of circumferential local heating is larger, and the heating requirements of pin shafts of different models can be better met.

EXAMPLE III

As shown in fig. 7, the present embodiment is different from the first embodiment in that: the number of coil installation parts 21 is two at least, just coil installation parts 21 in along arc-shaped section 211's central line direction on parallel distribution. Each coil mounting portion 21 is provided with an induction coil, and the induction coils on the coil mounting portions 21 operate independently.

According to the length of the pin shaft to be processed, the induction coils on the coil mounting parts 21 with proper number are selected for induction heating, the length adjustment range of the induction heating of the chain pin shaft is larger, and the heating requirements of chain pin shafts with different lengths can be met.

Example four

A circumferential local quenching device for a chain pin shaft comprises a rack, a mounting seat and a circumferential local heating assembly in any one of the first embodiment to the third embodiment, wherein the circumferential local heating assembly is detachably connected with the rack. The mounting bracket 4 is connected with the frame, and the relative position of the mounting plate and the frame can be adjusted along the extending direction of the insertion groove. The induction heating element is arranged towards the mounting seat. The mounting seat is provided with a pin shaft mounting and positioning assembly for mounting the chain pin shaft and circumferentially positioning the chain pin shaft.

Further, still be equipped with conveying assembly on the mount pad, conveying assembly is used for sending into the round pin axle installation locating component heating station.

A circumferential local quenching process for a chain pin shaft adopts the circumferential local quenching device in the fourth embodiment, and at least comprises the following steps:

adjusting the relative position of the mounting bracket 4 and the rack;

step two, conveying the chain pin shaft to be processed into the coil mounting part 21 at a specific angle, and adjusting the position of the chain pin shaft relative to the coil mounting part 21;

thirdly, electrifying the induction coil, starting to heat the chain pin shaft, and moving out the chain pin shaft after heating for a preset time;

and step four, carrying out subsequent quenching operation.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A circumferential localized heating assembly for a rod-shaped workpiece, comprising: the heating device comprises a heating unit, wherein the heating unit comprises a supporting part and a coil mounting part, and the supporting part is connected with the coil mounting part; the coil mounting part is arranged in an open loop mode and comprises arc-shaped sections arranged in a C shape; the coil installation part is provided with an induction coil, and the induction coil extends along the coil installation part.

2. The circumferential localized heating assembly of claim 1, wherein: the quantity of supporting part is two, the coil installation department be located between two supporting parts.

3. The circumferential localized heating assembly of claim 2, wherein: and cooling channels are respectively arranged in the supporting part and the coil mounting part, and the cooling channels in the supporting part are communicated with the cooling channels in the coil mounting part.

4. The circumferential localized heating assembly of claim 1, wherein: the arc-shaped sections are semicircular.

5. A circumferential localized heating assembly as in any one of claims 1-4, wherein: two ends of the arc-shaped segment are respectively connected with a straight line segment,

the arc-shaped section and the straight-line section are respectively provided with an induction coil, and the induction coils on the arc-shaped section and the straight-line section work independently.

6. The circumferential localized heating assembly of claim 5, wherein: the length L of the straight line segment and the radius of the arc segment are R, then L: r =0.2 to 0.4.

7. The circumferential localized heating assembly of claim 1, wherein: the quantity of coil installation department is two at least, just the coil installation department along arc segmentation's central line direction on parallel distribution.

8. The circumferential localized heating assembly of claim 5, wherein: the quantity of coil installation department is two at least, just the coil installation department along arc segmentation's central line direction on parallel distribution.