CN218224345U - Car leaf spring double-end grasswort firing equipment - Google Patents

Abstract

The utility model provides an automobile plate spring double-end eye rolling heating device, which comprises a feeding mechanism and heating furnaces symmetrically arranged at two sides of the feeding mechanism, wherein a heating port is arranged at the side surface of each heating furnace, and an induction heating coil for heating the end part of a plate spring is arranged in each heating furnace; the induction heating coil comprises a first coil and a second coil which are arranged in parallel; the first coil is positioned in the middle of the heating furnace, and the second coil is horizontally positioned outside the first coil. The utility model discloses a make the total length of second coil be greater than the total length of first coil, the number of turns of second coil is less than first coil, in parallelly connected resonance, induced-current on the second coil will be greater than the induced-current on first coil, the leaf spring tip is earlier through first coil, realize the primary heating, then pass through first coil in-process again, the temperature rises gradually, reach the designing requirement after, pass through after the second coil again, be in the heat preservation state, whole leaf spring of messenger is from the front to the back, the temperature is in controllable range, guarantee the homogeneity of heating region temperature.

Description

Car leaf spring double-end grasswort firing equipment

Technical Field

The utility model relates to a leaf spring processing technology field especially relates to an automobile leaf spring double-end eye rolling heating equipment.

Background

The automobile plate spring is the most traditional elastic element in an automobile suspension system and has the advantages of good reliability, simple structure, short manufacturing process flow, low cost, greatly simplified structure and the like. The automobile plate spring is generally a group of spring beams with similar equal strength, which are formed by combining a plurality of alloy spring steels with different lengths. And two ends of the spring steel at the lowest layer need to be processed with lugs so as to be convenient to install. Before the processing, the eye at the two ends of the plate spring needs to be heated.

The existing plate spring eye mostly adopts a heating furnace, one end is heated once, one plate spring needs to be heated repeatedly twice, the processing efficiency is lower, meanwhile, the heating furnace adopts fossil fuels such as natural gas and the like, certain waste gas pollution environment can be generated, and in addition, the energy utilization efficiency is reduced because the generated partial heat is discharged along with waste gas.

At present, some devices for heating the lugs at two ends of the plate spring at the same time are also available in the market, for example, chinese patent CN216501952U discloses a heating device for heating the lugs at two ends of the plate spring, which includes two heating furnaces, wherein a feeding mechanism is arranged in the middle of the heating furnaces, openings are arranged on the side surfaces of the heating furnaces, and the openings are arranged oppositely, so that feeding into the heating furnaces through the feeding mechanism is facilitated. The heating furnace is internally provided with the medium-frequency induction heating coil, and the electromagnetic heating technology is adopted to provide contactless heating for the plate, so that the heating speed is high.

Although the patent can utilize the electromagnetic heating mode to realize the synchronous heating to leaf spring both ends book ear, many leaf springs are marching type heating in the heating furnace, and the leaf spring has certain width simultaneously, and this needs the leaf spring tip completely through induction heating coil after, the leaf spring tip heating region temperature is even, and need accord with the temperature design requirement after the heating.

Since the above patent does not disclose a specific structure of the induction heating coil, generally speaking, in the existing induction heating furnace, the induction coils are mostly in series connection, the current of the whole heating coil is consistent, and the heating efficiency is lower than that of the coil inside due to the divergence phenomenon of the magnetic field near the outer side of the coil; in addition, the heat dissipation close to the inner part of the coil is less, and the heat dissipation close to the outer part of the coil is more, so that the temperature of the whole plate spring is always uneven in the length direction. When viewed in the length direction of the plate spring, the temperature of a region close to the center of the plate spring is low, and the temperature of a region close to the end head of the plate spring is high; the width of the plate spring is greatly different in size from the width of the heating region when viewed in the width direction of the plate spring, and the temperature is uniform in the width direction. Although the external coil magnetic field can be enhanced by arranging the copper tube spacing close to the outside of the coil to be reduced, the method is limited after all and cannot well solve the temperature consistency of the heating area.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an automobile leaf spring double-end grasswort firing equipment for ensure the homogeneity of leaf spring tip heating region temperature.

The technical scheme of the utility model is realized like this:

the utility model provides an automobile plate spring double-end eye heating device, which comprises a feeding mechanism and heating furnaces symmetrically arranged on two sides of the feeding mechanism, wherein a heating port is arranged on the side surface of each heating furnace, the heating ports are oppositely arranged, the feeding mechanism is used for horizontally transmitting a plate spring in a stepping mode, so that the end part of the plate spring enters the heating furnace from one side of the heating furnace through the heating port and is conveyed to the other side of the heating furnace, and an induction heating coil for heating the end part of the plate spring is arranged in the heating furnace;

the heating furnace comprises an upper furnace body and a lower furnace body which are parallel up and down and are connected with each other, and the heating port is formed between the upper furnace body and the lower furnace body;

the induction heating coil comprises a first coil and a second coil which are arranged in parallel; wherein, the first and the second end of the pipe are connected with each other,

the first coil is positioned in the middle of the heating furnace and comprises a plurality of groups of first conductive tubes which are arranged in pairs, the first conductive tubes are of a door-shaped structure, two first conductive tubes in each group of first conductive tubes are respectively horizontally arranged in the upper furnace body and the lower furnace body and are aligned up and down, the opening direction of the first conductive tubes is far away from the opening direction of the heating opening, the first conductive tubes in the groups are sequentially nested and arranged in the horizontal direction, and all the first conductive tubes are connected in series;

the second coil is horizontally positioned outside the first coil and comprises a plurality of groups of second conductive tubes which are arranged in pairs, the second conductive tubes are of a door-shaped structure, two second conductive tubes in each group of second conductive tubes are respectively horizontally arranged in the upper furnace body and the lower furnace body and are aligned up and down, the opening direction of the second conductive tubes is far away from the opening direction of the heating opening, the plurality of groups of second conductive tubes are sequentially nested and arranged in the horizontal direction, and all the second conductive tubes are connected in series;

the total length of the second coil is larger than that of the first coil, and the number of turns of the second conductive tube is smaller than that of the first conductive tube.

On the basis of the technical scheme, preferably, the first conductive pipe comprises two first vertical pipes and a first transverse pipe connected with the same ends of the two first vertical pipes; the second conductive pipe comprises two second vertical pipes and a second transverse pipe connected with the same ends of the two second vertical pipes; in the same horizontal direction, the distance between every two adjacent first vertical pipes is equal, the distance between every two adjacent second vertical pipes is equal, and the distance between every two adjacent second vertical pipes is smaller than the distance between every two adjacent first vertical pipes; the distance between two adjacent first horizontal pipes is equal, the distance between two adjacent second horizontal pipes is equal, and the distance between two adjacent second horizontal pipes is greater than the distance between two adjacent first horizontal pipes.

On the basis of the above technical scheme, preferably, induction heating coil still includes anodal collecting pipe and negative pole collecting pipe, and the one end of anodal collecting pipe is parallelly connected with the positive terminal of first coil and the positive terminal of second coil respectively, and the one end of negative pole collecting pipe is parallelly connected with the negative pole end of first coil and the negative pole end of second coil respectively, and the other end of anodal collecting pipe and negative pole collecting pipe extends the furnace body outside respectively.

Preferably, at least one cooling water joint is arranged on each of the positive electrode bus pipe and the negative electrode bus bar.

Further, preferably, at least one cooling water pipe is arranged on each of the first coil and the second coil.

On the basis of the technical scheme, preferably, the upper furnace body and the lower furnace body both comprise epoxy resin bodies and asbestos cement layers wrapped on the outer surfaces of the epoxy resin bodies.

Further, preferably, the inner wall of the heating port is coated with a refractory cement layer.

On the basis of the technical scheme, preferably, temperature measuring holes are respectively formed in the top surface of the upper furnace body along the conveying direction of the feeding mechanism.

Preferably, the feeding mechanism is a chain conveying mechanism.

The utility model discloses following beneficial effect has for prior art:

(1) The utility model discloses a car leaf spring double-end grasswort firing equipment, through set up the first coil and the second coil that connect in parallel each other in the heating furnace, first coil includes the first contact tube of connecting of corresponding from top to bottom in last furnace body and lower furnace body, the first contact tube of multiunit is nested arranging in order at heating furnace middle part horizontal direction, all first contact tubes establish ties each other, the second coil includes the second contact tube of connecting corresponding from top to bottom in last furnace body and lower furnace body, the multiunit second contact tube is nested arranging in order in first coil outside horizontal direction, all second contact tubes establish ties each other, the overall length of second coil is greater than the overall length of first coil simultaneously, the number of turns of second contact tube is less than the number of turns of first contact tube, in the resonance that connects in parallel, second coil impedance is less than first coil. Therefore, the induced current on the second coil is larger than that on the first coil, the end part of the plate spring passes through the first coil to realize preliminary heating, then the temperature gradually rises in the process of passing through the first coil, and after the end part of the plate spring reaches the design requirement and passes through the second coil, the plate spring is in a heat preservation state, so that the temperature of the whole plate spring is in a controllable range from front to back, and the uniformity of the temperature of a heating area is ensured;

(2) The distance between every two adjacent second transverse pipes is larger than the distance between every two adjacent first transverse pipes, the distance between every two adjacent second transverse pipes is smaller than the distance between every two adjacent first transverse pipes, so that the end part of the plate spring firstly passes through a second coil area, the plate spring is preliminarily preheated, the temperature of the end part of the plate spring in the area is lower, the end part of the plate spring is close to the outside of a coil, a magnetic field is diffused, the temperature of the end part of the plate spring in the area is lower, the plate spring is heated to a set temperature when passing through a comprehensive area of the first coil and the second coil, the plate spring is in a heat preservation state when passing through the second coil area, and the temperature is gradually uniform in a heat preservation stage;

(3) The heating furnace consists of an epoxy resin body and an asbestos cement layer wrapped on the outer surface of the epoxy resin body, so that the strength of the whole heating furnace is ensured, the heating furnace also has a higher insulation grade, and electric leakage in the working process is avoided;

(4) The inner wall of the heating port is coated with a refractory cement layer, so that the heat radiation of the plate spring to the coil is isolated, and the service life of the induction heating coil is prolonged; secondly, the heating port forms a relatively closed space to reduce the loss of heat and improve the utilization efficiency of energy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of an operating state of the automobile plate spring double-end rolling lug heating device disclosed by the invention;

FIG. 2 is a schematic view of the assembly structure of the heating furnace and the induction heating coil disclosed by the present invention;

fig. 3 is a schematic view of a first-view perspective structure of an induction heating coil disclosed by the present invention;

fig. 4 is a schematic diagram of a second perspective three-dimensional structure of an induction heating coil disclosed by the present invention;

fig. 5 is a schematic view of a planar structure of an induction heating coil disclosed in the present invention;

the attached drawings are as follows:

1. a feeding mechanism; 2. a heating furnace; 20. a heating port; 3. an induction heating coil; 21. an upper furnace body; 22. a lower furnace body; 31. a first coil; 32. a second coil; 311. a first conductive tube; 321. a second conductive tube; 3112. a first vertical tube; 3111. a first cross tube; 3212. a second vertical tube; 3211. a second cross tube; 33. a positive collector tube; 34. a negative collector tube; 35. a cooling water joint; 36. a cooling water pipe; 210. an epoxy resin body; 220. a layer of asbestos cement; 230. a refractory cement layer; 200. a temperature measuring hole; s, a plate spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, combine fig. 2-5, the embodiment of the utility model discloses a car leaf spring double-end book ear firing equipment, including feeding mechanism 1 and symmetrical arrangement at the heating furnace 2 of feeding mechanism 1 both sides, heating furnace 2 side is provided with heating port 20, and heating port 20 sets up relatively, and feeding mechanism 1 is used for the marching type to carry out horizontal transport to the leaf spring to make the leaf spring tip get into in heating furnace 2 and carry to heating furnace 2 opposite side through heating port 20 by heating furnace 2 one side, be provided with in the heating furnace 2 and carry out the induction heating coil 3 that heats to the leaf spring tip.

In the actual operation process, the plate springs are continuously arranged on the feeding mechanism 1, the distance between the plate springs is equal, and the whole heating furnace 2 can simultaneously convey a plurality of plate springs in a stepping mode from one side of the heating furnace 2 to the other side through the heating port 20 under the action of the feeding mechanism 1, so that the high-efficiency heating of the eye curling at the two ends of the plate springs is realized. In this embodiment, the feeding mechanism 1 is a chain conveying mechanism.

In the present embodiment, the heating furnace 2 includes an upper furnace body 21 and a lower furnace body 22 which are parallel to each other in the up-down direction and are connected to each other, and the heating port 20 is formed between the upper furnace body 21 and the lower furnace body 22. With this arrangement, the induction heating coil 3 can heat the ends of the plate springs in the heating ports 20 in the upper furnace body 21 and the lower furnace body 22.

The induction heating coil 3 of the present embodiment includes a first coil 31 and a second coil 32 arranged in parallel, and the purpose thereof is to control the magnitude of induced currents of the two coils, and to achieve the uniformity of the heating temperature of the end portion of the plate spring by the structural arrangement of the first coil 31 while complying with the design requirements.

In this embodiment, the first coil 31 is located in the middle of the heating furnace 2, because the first coil 31 needs to be disposed in the middle of the upper furnace body 21 and the lower furnace body 22, so as to heat the upper and lower surfaces of the plate spring at the same time, the first coil 31 of this embodiment includes a plurality of sets of paired first conductive tubes 311, each set of first conductive tubes 311 includes two first conductive tubes 311 with the same structure, the two first conductive tubes 311 are horizontally disposed in the upper furnace body 21 and the lower furnace body 22, and are aligned up and down, the first conductive tubes 311 are in a gate-shaped structure, the first conductive tubes 311 are copper tubes, the cross sections of the first conductive tubes 311 are square, and can directly face the sensing area on the surface of the plate spring, so as to improve the heating efficiency, the opening direction of the first conductive tubes 311 is far away from the opening direction of the heating port 20, the two first conductive tubes 311 in each set of first conductive tubes 311 are connected in series, the opening sizes of the first conductive tubes 311 in the sets of the first conductive tubes 311 are linearly increased in size, the first conductive tubes 311 are nested arrangement in the horizontal direction, all the first conductive tubes are connected in series, thereby, the first conductive tubes are disposed, the coil sets of the plate springs can be moved to the end portion of the sensing plate spring, and the end portion can be moved in the horizontal direction.

Because the plate spring is heated continuously in the heating furnace 2, if only one induction coil is arranged in series and a plurality of plate springs are matched to pass through, the plate spring can be continuously heated by the induction coil in the heating furnace 2, and the surface temperature is overhigh.

For this reason, in the embodiment, the second coil 32 is arranged outside the first coil 31, the second coil 32 includes a plurality of groups of second conductive tubes 321 arranged in pairs, the second conductive tubes 321 are in a gate structure, two second conductive tubes 321 in each group of second conductive tubes 321 are respectively horizontally arranged in the upper furnace body 21 and the lower furnace body 22 and are aligned up and down, the opening direction of the second conductive tubes 321 is far away from the opening direction of the heating opening 20, the plurality of groups of second conductive tubes 321 are sequentially nested in the horizontal direction, and all the second conductive tubes 321 are connected in series. Therefore, in this embodiment, the number of the second conductive tubes 321 is less than that of the first conductive tubes 311, meanwhile, the total length of the second coil 32 is greater than that of the first coil 31, and the number of turns of the second conductive tubes 321 is less than that of the first conductive tubes 311, so that in parallel resonance, the impedance of the first coil 31 is set to be less than that of the second coil 32, so that the current flowing through the second coil 32 is greater than that flowing through the first coil 31, the end of the leaf spring passes through the first coil 31 to realize preliminary heating, and then passes through the first coil 31 to gradually raise the temperature in the process of passing through the first coil 31, and after the end of the leaf spring passes through the second coil 32 to be in a heat preservation state, so that the temperature of the whole leaf spring is within a controllable range from front to back, and the uniformity of the temperature of a heating region is ensured.

In the embodiment, two groups of coils are arranged, so that the magnetic field close to the outside of the coils is strengthened, and the magnetic field close to the inside of the coils is weakened, and the temperature uniformity of the heating area is ensured by the two means.

In order to realize uniform heating temperature at the end of the plate spring, the first coil and the second coil are structurally arranged, specifically, the first conductive pipe 311 includes two first vertical pipes 3112 and a first horizontal pipe 3111 connected to the same end of the two first vertical pipes 3112, so that the first conductive pipe 311 forms a door-shaped structure; the second conductive pipe 321 includes two second vertical pipes 3212 and a second horizontal pipe 3211 connected to the same ends of the two second vertical pipes 3212, so that the second conductive pipe 321 forms a door-shaped structure; in the same horizontal direction, the distance between two adjacent first vertical pipes 3112 is equal, the distance between two adjacent second vertical pipes 3212 is equal, and the distance between two adjacent second vertical pipes 3212 is smaller than the distance between two adjacent first vertical pipes 3112. The distance between two adjacent first horizontal pipes 3111 is equal, the distance between two adjacent second horizontal pipes 3211 is equal, and the distance between two adjacent second horizontal pipes 3211 is less than the distance between two adjacent first horizontal pipes 3111.

By adopting the technical scheme, the plate spring firstly passes through an area formed by the second transverse pipe and the second vertical pipe at one end of the second coil, and the area is marked as an area I with reference to the attached figure 5; then passing through a composite area formed by a second vertical pipe in the first coil and the second coil, wherein the area is marked as an area two; and finally, passing through an area formed by a second transverse pipe and a second vertical pipe at the other end of the second coil, wherein the area is marked as an area III.

In the first region, the leaf spring is initially preheated. The area, close to the outside of the second coil, where the magnetic field diverges; in the area, the distance between the second transverse pipes is large, the distance between the second vertical pipes is small, and when the plate spring passes through the area, the temperature distribution condition of the plate spring in the length direction is that the temperature is high near the central part of the plate spring, and the temperature is low near the end of the plate spring.

In the second area, the temperature of the plate spring is gradually increased, and the temperature of the plate spring reaches the process requirement after passing through the second area by adjusting proper heating parameters. The coil structure is set to be that the distance between two adjacent first transverse pipes in the first coil is consistent; two adjacent first risers in the first coil are spaced apart by two adjacent second risers in the second coil. The second coil is positioned outside the whole coil, the magnetic field is dissipated to a certain degree, and the actual magnetic field intensity is weakened; in order to strengthen the magnetic field, on one hand, a coil with a special structure is arranged, so that the impedance of the second coil is smaller than that of the first coil, and the current of the second coil is larger than that of the first coil, so that the magnetic field of the second coil is strengthened; in addition, the distance between the first vertical pipes in the first coil is larger than the distance between the second vertical pipes in the second coil, so that the magnetic field of the first coil is weakened; by both methods, the magnetic field is weaker in the section belonging to the first coil in the second region and the magnetic field is stronger in the section belonging to the second coil. Therefore, when the leaf spring moves in the second area, after the leaf spring is heated, the heat inside the coil is concentrated and not dissipated, but the heat dissipation of the coil close to the outside is large, so that in order to obtain a heating area with uniform temperature in the second area, the outside of the coil needs to be intensively heated, and the inside heating of the coil is weakened.

The transverse pipe spacing of the first coil arranged in the second region is consistent, and the spacing is smaller than the transverse pipe spacing of the second coil arranged in the first region.

In the third region, the structure of the third region is similar to that of the first region, the heating effect is also similar to that of the first region, in the third region, through the heating of the second region, the plate spring which reaches the temperature is in a heat preservation state in the third region, in the state, the magnetic field close to the center of the plate spring is stronger, the magnetic field close to the end of the plate spring is weaker, because the heat of the heated region close to the center of the plate spring can diffuse towards the center of the plate spring along the length direction of the plate spring, but the heat diffusion at the position close to the end of the plate spring is slower, the magnetic field close to the center of the plate spring needs to be strengthened, the magnetic field close to the end of the plate spring is weakened, and the temperature can be further uniform in the heat preservation stage.

In order to realize that the first coil 31 and the second coil 32 are connected in parallel and connected to the quenching transformer, the induction heating coil 3 of the present embodiment further includes an anode bus pipe 33 and a cathode bus pipe 34, one end of the anode bus pipe 33 is connected in parallel with the anode end of the first coil 31 and the anode end of the second coil 32, one end of the cathode bus pipe 34 is connected in parallel with the cathode end of the first coil 31 and the cathode end of the second coil 32, and the other ends of the anode bus pipe 33 and the cathode bus pipe 34 extend out of the upper furnace body 21. With this arrangement, the positive bus bar 33 and the negative bus bar 34 can be connected to one quenching transformer after being connected in parallel to the first inductor and the second inductor.

At least one cooling water joint 35 is arranged on each of the positive electrode collecting pipe 33 and the negative electrode collecting bar. Through setting up a plurality of cooling water joint 35, can dispel the heat to the induction coil fast.

At least one cooling water pipe 36 is arranged on each of the first coil 31 and the second coil 32. The cooling water inlet amount can be further increased, and the heating ring can be efficiently cooled.

In this embodiment, each of the upper furnace body 21 and the lower furnace body 22 includes an epoxy resin body 210 and an asbestos cement layer 220 wrapped on an outer surface of the epoxy resin body 210. Therefore, the strength of the whole heating furnace 2 is ensured, a high insulation grade is also provided, and electric leakage in the working process is avoided.

In this embodiment, the inner wall of the heating port 20 is coated with a refractory cement layer 230, which firstly isolates the heat radiation of the plate spring to the coil, and improves the service life of the induction heating coil 3; secondly, the heating port 20 forms a relatively closed space to reduce the dissipation of heat and improve the utilization efficiency of energy.

Preferably, the top surface of the upper furnace body 21 is provided with temperature measuring holes 200 along the conveying direction of the feeding mechanism 1. Therefore, the device can be provided with an infrared thermometer to monitor the heating temperature of the plate spring in real time, and collected data are sent to a monitoring system to be processed.

The utility model discloses a theory of operation:

through set up first coil 31 and second coil 32 that connect in parallel each other in heating furnace 2, first coil 31 includes the first contact tube 311 of corresponding connection from top to bottom in last furnace body 21 and lower furnace body 22, multiunit first contact tube 311 is nested in proper order in heating furnace 2 middle part horizontal direction and is arranged, all first contact tubes 311 are established ties each other, second coil 32 includes the second contact tube 321 of corresponding connection from top to bottom in last furnace body 21 and lower furnace body 22, multiunit second contact tube 321 is nested in proper order in the outside horizontal direction of first coil 31 and is arranged, all second contact tubes 321 are established ties each other, the total length of second coil 32 is greater than the total length of first coil 31 simultaneously, the number of turns of second contact tube 321 is less than the number of turns of first contact tube 311. In parallel resonance, the impedance of the second coil is smaller than that of the first coil, the induced current on the second coil 32 is larger than that on the first coil 31, the end part of the plate spring firstly passes through the first coil 31 to realize primary heating, then the temperature gradually rises in the process of passing through the first coil 31, the plate spring reaches the design requirement and then is in a heat preservation state after passing through the second coil 32, the temperature of the whole plate spring is controlled within a controllable range from front to back, and the temperature uniformity of a heating area is ensured.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A double-end eye-curling heating device for automobile leaf springs comprises a feeding mechanism (1) and heating furnaces (2) symmetrically arranged on two sides of the feeding mechanism (1), wherein heating ports (20) are formed in the side faces of the heating furnaces (2), the heating ports (20) are oppositely arranged, the feeding mechanism (1) is used for horizontally conveying the leaf springs in a stepping mode, so that the end portions of the leaf springs enter the heating furnaces (2) from one sides of the heating furnaces (2) through the heating ports (20) and are conveyed to the other sides of the heating furnaces (2), and induction heating coils (3) for heating the end portions of the leaf springs are arranged in the heating furnaces (2);

the method is characterized in that: the heating furnace (2) comprises an upper furnace body (21) and a lower furnace body (22) which are parallel up and down and are connected with each other, and the heating port (20) is formed between the upper furnace body (21) and the lower furnace body (22);

the induction heating coil (3) comprises a first coil (31) and a second coil (32) which are arranged in parallel; wherein, the first and the second end of the pipe are connected with each other,

the first coil (31) is positioned in the middle of the heating furnace (2) and comprises a plurality of groups of first conductive tubes (311) which are arranged in pairs, the first conductive tubes (311) are of a door-shaped structure, two first conductive tubes (311) in each group of first conductive tubes (311) are respectively horizontally arranged in the upper furnace body (21) and the lower furnace body (22) and are aligned up and down, the opening direction of the first conductive tubes (311) is far away from the opening direction of the heating opening (20), the first conductive tubes (311) in the groups are sequentially nested and arranged in the horizontal direction, and all the first conductive tubes (311) are mutually connected in series;

the second coil (32) is horizontally positioned outside the first coil (31) and comprises a plurality of groups of second conductive tubes (321) which are arranged in pairs, the second conductive tubes (321) are in a door-shaped structure, two second conductive tubes (321) in each group of second conductive tubes (321) are respectively horizontally arranged in the upper furnace body (21) and the lower furnace body (22) and are aligned up and down, the opening direction of the second conductive tubes (321) is far away from the opening direction of the heating opening (20), the plurality of groups of second conductive tubes (321) are sequentially nested and arranged in the horizontal direction, and all the second conductive tubes (321) are connected in series;

the total length of the second coil (32) is larger than that of the first coil (31), and the number of turns of the second conductive tube (321) is smaller than that of the first conductive tube (311).

2. The automotive leaf spring double-ended eye heating apparatus of claim 1, wherein: the first conductive pipe (311) comprises two first vertical pipes (3112) and a first transverse pipe (3111) connected with the same end of the two first vertical pipes (3112); the second conductive pipes (321) comprise two second vertical pipes (3212) and a second transverse pipe (3211) connected with the same ends of the two second vertical pipes (3212); in the same horizontal direction, the distance between two adjacent first vertical pipes (3112) is equal, the distance between two adjacent second vertical pipes (3212) is equal, and the distance between two adjacent second vertical pipes (3212) is smaller than the distance between two adjacent first vertical pipes (3112); the distance between two adjacent first horizontal pipes (3111) is equal, the distance between two adjacent second horizontal pipes (3211) is equal, and the distance between two adjacent second horizontal pipes (3211) is greater than the distance between two adjacent first horizontal pipes (3111).

3. The automotive leaf spring double-ended eye heating apparatus of claim 1, wherein: induction heating coil (3) still include anodal collecting pipe (33) and negative pole collecting pipe (34), and the one end of anodal collecting pipe (33) is parallelly connected with the positive terminal of first coil (31) and the positive terminal of second coil (32) respectively, and the one end of negative pole collecting pipe (34) is parallelly connected with the negative pole end of first coil (31) and the negative pole end of second coil (32) respectively, and the other end of anodal collecting pipe (33) and negative pole collecting pipe (34) extends respectively and goes up the furnace body (21) outside.

4. The automotive leaf spring double-ended eye heating apparatus of claim 3, wherein: and at least one cooling water joint (35) is arranged on each of the positive bus pipe (33) and the negative bus bar.

5. The automotive leaf spring double-ended eye heating apparatus of claim 4, wherein: and the first coil (31) and the second coil (32) are respectively provided with at least one cooling water pipe (36).

6. The automotive leaf spring double-ended eye heating apparatus of claim 1, wherein: the upper furnace body (21) and the lower furnace body (22) both comprise an epoxy resin body (210) and an asbestos cement layer (220) wrapped on the outer surface of the epoxy resin body (210).

7. The automotive leaf spring double-ended eye heating apparatus of claim 4, wherein: the inner wall of the heating port (20) is coated with a refractory cement layer (230).

8. The automotive leaf spring double-ended eye heating apparatus of claim 1, wherein: the top surface of the upper furnace body (21) is respectively provided with a temperature measuring hole (200) along the conveying direction of the feeding mechanism (1).

9. The automotive leaf spring double-ended eye heating apparatus of claim 1, wherein: the feeding mechanism (1) is a chain conveying mechanism.

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