Heating system of annealing furnace

Abstract

The invention relates to the technical field of annealing furnaces, in particular to an annealing furnace heating system which comprises a furnace body, an air blower arranged at the top of the furnace body and used for exhausting and sucking air and a heating bin used for heating air in the furnace body. The top of the furnace body is further provided with an air compression mechanism used for making air in the furnace body circularly flow, the air compression mechanism communicates with the interior of the heating bin through a pipeline, the bottom in the heating bin is connected with an air outlet pipe, and the end, away from the heating bin, of the air outlet pipe is connected to the top end in the heating bin. And the compression pipe is connected with a plurality of air inlet pipes which are transversely arranged side by side at the bottom of the furnace body, and the other end of the compression pipe communicates with the input end of the air compression mechanism. The heating system of the annealing furnace is improved, so that hot air in the annealing furnace is uniformly distributed, a workpiece is uniformly annealed, and the physical performance of the annealed workpiece is improved.

Description

Technical Field

[0001] This application relates to the field of annealing furnace technology, particularly to an annealing furnace heating system. Background Art

[0002] An annealing furnace is an indispensable device for implementing the annealing process. It can slowly heat metal to a certain temperature, maintain it for a sufficient time, and then cool it at an appropriate speed. The purposes are to reduce hardness, improve machinability; reduce residual stress, stabilize dimensions, reduce deformation and crack tendency; refine grains, adjust the structure, eliminate tissue defects, etc.

[0003] In the prior art, annealing furnaces heated by air have a relatively wide range of applications and good heat preservation effects. Such annealing furnaces often heat the air inside the annealing furnace through heating equipment, and then form a completely enclosed high-temperature environment to achieve the operations of heating and heat preservation. However, during the operation of such annealing furnaces, the heated air is introduced into the furnace body from below. Although this can enable the workpiece to be processed to heat up quickly, since the hot air is lighter in mass, it will heat up quickly and gather above the inside of the furnace body, resulting in uneven heating of the workpiece, and thus affecting the quality of the workpiece after annealing. Summary of the Invention

[0004] In order to improve the heating structure of the annealing furnace, so that the furnace can slowly heat up during workpiece annealing and improve the physical properties of the workpiece after annealing, this application provides an annealing furnace heating system.

[0005] The annealing furnace heating system provided by this application adopts the following technical solutions:

[0006] The annealing furnace heating system includes a furnace body, a blower arranged at the top of the furnace body for discharging and inhaling air, and a heating chamber for heating the air inside the furnace body. A plurality of energized heating rods are rotatably installed along the circumferential direction inside the heating chamber. An air compression mechanism for circulating and flowing the air inside the furnace body is also arranged at the top of the furnace body. The air compression mechanism is communicated with the inside of the heating chamber through a pipeline. An air outlet pipe is connected to the bottom inside the heating chamber, and the end of the air outlet pipe away from the heating chamber is connected to the top end inside the heating chamber. The furnace body is equipped with a compression pipe, and a plurality of intake pipes arranged side by side horizontally are connected to the bottom of the furnace body through the compression pipe. The other end of the compression pipe is communicated with the input end of the air compression mechanism.

[0007] Optionally, the furnace body includes an inner cavity and an outer shell arranged at intervals, and a closed insulation cavity is formed between the inner cavity and the outer shell. A connecting pipe is provided on the side wall of the inner cavity, and both ends of the connecting pipe extend into the inner cavity and the insulation cavity respectively. A vent pipe connected to the insulation cavity is connected to the outer shell, and the end of the vent pipe away from the inner cavity extends out of the furnace body outer shell and is fixedly connected to a vent valve.

[0008] Optionally, the air compression mechanism includes a support frame arranged on the top of the furnace body, a compression motor installed on the support frame, a compression cylinder connected to the support frame, and a connecting pipe, one end of the connecting pipe is connected to the compression cylinder, and the other end of the connecting pipe extends into the furnace body and is connected to the compression pipe.

[0009] Optionally, a fan for stirring the hot air inside the heating chamber is rotatably connected to the bottom of the heating chamber, and the fan is connected to an AC motor. The fan includes a fixed ring and several blades circumferentially arranged on the fixed ring, and the several blades are commonly connected to an adjustment mechanism for adjusting the inclination direction between the blades and the horizontal plane. The output shaft of the AC motor is connected to an adjustment shaft, and the fixed ring is fixedly sleeved on the adjustment shaft.

[0010] Optionally, the adjustment mechanism includes a pressing cylinder installed at the bottom of the heating rod, the adjusting shaft is a stepped shaft, and a pressing ring is rotatably sleeved on the adjusting shaft and connected to the top of the pressing cylinder, a plurality of adjustment grooves corresponding to several fan blades are opened along the circumference on the inner side of the fixed ring, the end of the fan blade extends into the adjustment groove and is detachably connected to an adjustment plate, one end of the bottom side of the adjustment groove is connected to an elastic pin that can be retracted into the interior of the fixed ring, and the adjustment groove is vertically slidably connected to a pressing key parallel to the axis of the fan blade on the side away from the elastic pin, and several of the pressing keys extend out of the adjustment groove away from the end of the fan blade and are located on the lower side of the pressing ring.

[0011] Optionally, the pressing cylinder and the pressing ring are in contact connection, a number of return springs are circumferentially connected to the adjusting shaft at the stepped position, and a lifting ring is commonly connected to the tops of the several return springs, the lifting ring is slidably sleeved on the adjusting shaft, and the top of the lifting ring is in contact with the pressing ring.

[0012] In summary, this application includes at least one of the following beneficial technical effects:

[0013] 1. During the annealing process, hot air can completely fill the internal space of the furnace, so as to heat and keep the workpiece in an all-round manner, thereby avoiding uneven heating of the workpiece and causing degradation of its physical properties;

[0014] 2. This application can achieve slow heating of the workpiece during the annealing process, avoiding a large temperature difference in the hot air contacted by the workpiece per unit time, which may cause the internal structure of the workpiece to be unstable, and improving the toughness performance of the workpiece after annealing;

[0015] 3. This application has a good heat preservation effect, can avoid the leakage of hot air, and has high practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic side view of the overall structure of the annealing furnace heating system of this application.

[0017] Figure 2 It is a schematic front view of the overall structure of the annealing furnace heating system of this application.

[0018] Figure 3 It is a structural view of the air compression mechanism of the annealing furnace heating system of this application.

[0019] Figure 4 It is Figure 2 The cross-sectional view at A-A in

[0020] Figure 5 It is Figure 4 The enlarged view at A in

[0021] Figure 6 It is an exploded view of the adjusting shaft and its connection structure of the annealing furnace heating system of this application.

[0022] Figure 7 It is Figure 6 The enlarged view at B in

[0023] Description of the reference numerals: 1, furnace body; 11, inner cavity; 111, air outlet pipe; 112, compression pipe; 113, air inlet pipe; 12, outer shell; 121, air release pipe; 122, air release valve; 13, heat preservation cavity; 131, connecting pipe; 2, blower; 3, heating chamber; 31, heating rod; 4, air compression mechanism; 41, support frame; 42, compression motor; 43, compression cylinder; 44, connecting pipe; 5, fan; 51, fixing ring; 511, adjusting groove; 52, fan blade; 6, adjusting shaft; 61, AC motor; 7, adjusting mechanism; 71, pressing cylinder; 72, pressing ring; 73, adjusting plate; 74, elastic pin; 75, pressing key; 76, return spring; 77, lifting ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following is a further detailed description of this application in conjunction with the attached Figures 1-7 drawings.

[0025] The embodiment of this application discloses an annealing furnace heating system.

[0026] Referring toFigure 1 , The annealing furnace heating system includes a furnace body 1, a blower 2 arranged at the top of the furnace body 1, and a heating chamber 3 for heating the air inside the furnace body 1. The blower 2 can operate in both forward and reverse directions to pressurize the inside of the furnace body 1 and release air for cooling during annealing, improving the controllability of the internal environment of the furnace body 1 and the operation safety. A number of heating rods 31 are rotatably installed along the circumference inside the heating chamber 3. The heating rods 31 are energized to generate heat to heat the air to a predetermined temperature. An air compression mechanism 4 communicating with the heating chamber 3 is also arranged at the top of the furnace body 1 to facilitate compressing air into the heating chamber 3, promoting the air circulation inside the furnace body 1 to achieve uniform heating of the air, avoiding sudden temperature increase that may cause the workpiece to become brittle and prone to fracture.

[0027] An air outlet pipe 111 is connected to the bottom of the heating chamber 3, and the end of the air outlet pipe 111 far from the heating chamber 3 is connected to the inner top end of the furnace body 1. A compression pipe 112 is arranged inside the furnace body 1. The compression pipe 112 communicates with a number of intake pipes 113 arranged side by side at the bottom of the furnace body 1. The other end of the compression pipe 112 is connected to the input end of the air compression mechanism 4.

[0028] The heated air enters from the inner top of the furnace body 1, continuously squeezing the cold air below, and then uniformly filling the internal space of the furnace body 1 with air of equal temperature, improving the heat distribution density and facilitating uniform heating of the workpiece surface. At the same time, after being squeezed, the cold air enters the compression pipe 112 from the intake pipes 113 and is finally input into the heating chamber 3 through the air compression mechanism 4 for further heating, realizing the air circulation inside the furnace body 1.

[0029] Refer to Figure 1 and Figure 2 , Further, the furnace body 1 includes an inner cavity 11 and an outer shell 12 arranged at intervals. A heat insulation cavity 13 is formed between the inner cavity 11 and the outer shell 12. A communication pipe 131 is arranged on the inner side wall of the inner cavity 11, and the end of the communication pipe 131 extends into the heat insulation cavity 13 to realize gas communication. An air discharge pipe 121 communicating with the heat insulation cavity 13 is connected to the outer shell 12, and the end of the air discharge pipe 121 far from the inner cavity 11 extends out of the outer shell 12 and is fixedly connected with an air release valve 122. It is worth mentioning that the communication pipe 131 in this application realizes gas exchange through the air pressure difference, and the air pressure in the heat insulation cavity 13 is always less than the air pressure in the inner cavity 11. The function of designing the heat insulation cavity 13 in this application is to provide temperature isolation, avoiding the contact between the hot air inside the furnace body 1 and the furnace body 1 shell during the heat preservation process of annealing, thus preventing the uneven heating of the workpiece.

[0030] Refer to Figure 3, Specifically, the air compression mechanism 4 includes a support frame 41 fixedly installed on the top of the furnace body 1, a compression motor 42 installed on the support frame 41, a compression cylinder 43 connected to the support frame 41, and a connecting pipe 44. The compression motor 42 drives the air in the furnace body 1 into the compression cylinder 43, and then the air in the compression cylinder is discharged into the heating chamber 3. The other end of the connecting pipe 44 extends into the furnace body 1 and communicates with the compression pipe 112, thereby sucking the air into the compression cylinder 43 to achieve automatic suction of cold air and avoid slow annealing caused by passive suction.

[0031] Refer to Figure 4 and Figure 5 , a fan 5 is rotatably connected to the bottom of the heating rod 31 in the heating chamber 3 to stir the air in the heating chamber 3, changing static heating to dynamic heating, improving the heating efficiency and making the hot air to be released into the furnace body 1 in the heating chamber 3 evenly distributed. The fan 5 is connected to an AC motor 61, which can rotate forward and backward, and the fan 5 can change the air flow direction in the heating chamber 3 during rotation.

[0032] Specifically, the fan 5 includes a fixed ring 51 and a plurality of fan blades 52 rotatably arranged at equal intervals along the circumference on the fixed ring 51. The output shaft of the AC motor 61 is fixedly connected to an adjusting shaft 6, and the fixed ring 51 of the fan 5 is fixedly sleeved on the adjusting shaft 6. The fan blades 52 are at a predetermined inclination angle with the horizontal plane, and an adjusting mechanism 7 is also provided on the adjusting shaft 6 to control the fan blades 52 to rotate to the opposite inclination angle to change the wind direction. The purpose of the adjusting mechanism 7 is to prevent the air that has not been heated to the predetermined temperature from being discharged into the furnace body 1 through the air outlet pipe 111, playing a role in blocking the air.

[0033] In this application, the AC motor 61 drives the adjusting shaft 6 to rotate slowly. When the air density in the heating chamber 3 reaches a predetermined value, the hot air can overcome the thrust of the fan 5 and enter the air outlet pipe 111. A wind direction sensor is installed in the heating chamber 3. When it senses the flow of hot air towards the air outlet pipe 111, the wind direction sensor drives the adjusting mechanism 7 to reverse the inclination angle of the fan blades 52 to push the hot air to move. Since the wind direction sensor is an electronic component and has a small volume, it is not shown in the drawings of this application.

[0034] Refer to Figure 5 , Figure 6 and Figure 7 , the adjusting mechanism 7 specifically includes a pressing cylinder 71 installed at the bottom of the heating rod 31. The adjusting shaft 6 is a stepped shaft, and a pressing ring 72 is slidably sleeved above the step of the adjusting shaft 6, and the top side of the pressing ring 72 is connected to the end of the telescopic rod of the pressing cylinder 71 to drive the pressing ring 72 to move up and down along the axis of the adjusting shaft 6. A plurality of adjusting grooves 511 corresponding to the plurality of fan blades 52 one by one are circumferentially formed on the inner side of the fixed ring 51, and the heads of the plurality of fan blades 52 respectively extend into the corresponding adjusting grooves 511.

[0035] One end of the fan blade 52 extending into the adjustment groove 511 is detachably connected with an adjustment plate 73, and an elastic pin 74 that can retract into the fixing ring 51 is installed at one end of the bottom side of the adjustment groove 511 along the vertical direction perpendicular to the extending direction of the fan blade 52. The elastic pin 74 is used to lift the adjustment plate 73 when the adjustment plate 73 is not subjected to other forces, so as to realize the inclination of the fan blade 52. A pressing key 75 is slidably arranged on the side wall of the adjustment groove 511 on the side away from the elastic pin 74 along the vertical direction. One end of the pressing key 75 away from the fan blade 52 extends out of the adjustment groove 511 and is located below the pressing ring 72.

[0036] When it is necessary to change the inclination direction of the fan blade 52, the pressing cylinder 71 is driven to press the pressing ring 72 downward, so that the elastic pin 74 lifts the adjustment plate 73, realizing the turning of the fan blade 52.

[0037] Refer to Figure 6 and Figure 7 Furthermore, the pressing cylinder 71 and the pressing ring 72 are in contact connection. A plurality of return springs 76 are arranged at equal intervals in the circumferential direction at the stepped position on the adjusting shaft 6, and a jacking ring 77 is connected to the tops of the plurality of return springs 76 together. The jacking ring 77 is slidably sleeved on the adjusting shaft 6, and its top end abuts against the pressing ring 72. This design can ensure that the pressing ring 72 is buffered when moving, avoiding damage to the structure of the pressing key 75 when the pressing cylinder 71 fails or has a large stroke, playing a protective role.

[0038] The implementation principle of the annealing furnace heating system in the embodiment of the present application is as follows:

[0039] During the annealing process, the air compression mechanism 4 sucks the air in the furnace body 1 through the air inlet pipe 113 located at the bottom of the furnace body 1, and then sends the control air into the heating chamber 3 to be heated by the heating rod 31. During this process, the fan blade 52 of the fan 5 is inclined under the jacking effect of the elastic pin 74 and generates an upward wind force, so that the air in the heating chamber 3 can be fully heated.

[0040] Then, the density of the hot air gradually increases, and finally it is discharged into the furnace body 1 from the upper part inside the furnace body 1 through the air outlet pipe 111, realizing the heating of the furnace body 1. At this time, the fan blade 52 of the fan 5 turns under the drive of the pressing cylinder 71 and generates a downward wind force to help the hot air enter the furnace body 1 faster.

[0041] When the hot air in the furnace body 1 reaches a certain pressure, the hot air will enter the heat preservation cavity 13 through the communication pipe 131, so that the inner cavity 11 is isolated from the outside to achieve the best annealing effect.

[0042] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. Annealing furnace heating system, comprising a furnace body (1), a blower (2) arranged at the top of the furnace body (1) for discharging and inhaling air, and a heating chamber (3) for heating the air inside the furnace body (1), wherein a plurality of energized heating rods (31) are rotatably installed along the circumference inside the heating chamber (3), and it is characterized in that: At the top of the furnace body (1), an air compression mechanism (4) is also provided for circulating the air inside the furnace body (1). The air compression mechanism (4) is internally connected to the heating chamber (3) through a pipeline. At the bottom inside the heating chamber (3), an air outlet pipe (111) is connected. One end of the air outlet pipe (111) far from the heating chamber (3) is connected to the top end inside the heating chamber (3). The furnace body (1) is equipped with a compression pipe (112), and a number of intake pipes (113) arranged side by side horizontally are connected to the compression pipe (112) at the bottom of the furnace body (1). The other end of the compression pipe (112) is connected to the input end of the air compression mechanism (4).

2. The annealing furnace heating system according to claim 1, wherein: The furnace body (1) includes an inner cavity (11) and an outer shell (12) arranged at intervals. A sealed heat preservation cavity (13) is formed between the inner cavity (11) and the outer shell (12). A communication pipe (131) is provided on the side wall of the inner cavity (11). Both ends of the communication pipe (131) extend into the inner cavity (11) and the heat preservation cavity (13) respectively. An air discharge pipe (121) connected to the heat preservation cavity (13) is connected to the outer shell (12). One end of the air discharge pipe (121) far from the inner cavity (11) extends out of the outer shell (12) of the furnace body (1) and is fixedly connected with an air release valve (122).

3. The annealing furnace heating system according to claim 2, characterized in that: The air compression mechanism (4) includes a support frame (41) arranged at the top of the furnace body (1), a compression motor (42) installed on the support frame (41), a compression cylinder (43) connected to the support frame (41), and a connecting pipe (44). One end of the connecting pipe (44) is communicated with the compression cylinder (43), and the other end of the connecting pipe (44) extends into the furnace body (1) and is communicated with the compression pipe (112).

4. The annealing furnace heating system according to claim 1, characterized in that: A fan (5) for stirring the hot air inside the heating chamber (3) is rotatably connected to the bottom of the heating chamber (3). The fan (5) is connected with an AC motor (61). The fan (5) includes a fixed ring (51) and a number of fan blades (52) rotatably arranged circumferentially on the fixed ring (51). A number of the fan blades (52) are commonly connected with an adjustment mechanism (7) for adjusting the inclination direction between the fan blades (52) and the horizontal plane. The output shaft of the AC motor (61) is connected with an adjustment shaft (6), and the fixed ring (51) is fixedly sleeved on the adjustment shaft (6).

5. The annealing furnace heating system according to claim 4, characterized in that: The adjusting mechanism (7) includes a pressing cylinder (71) installed at the bottom of the heating rod (31). The adjusting shaft (6) is a stepped shaft, and a pressing ring (72) whose top is connected to the pressing cylinder (71) is rotatably sleeved on the adjusting shaft (6). A plurality of adjusting grooves (511) corresponding to the plurality of fan blades (52) one by one are circumferentially formed on the inner side of the fixing ring (51). The end of the fan blade (52) extends into the adjusting groove (511) and is detachably connected to an adjusting plate (73). One end of the bottom side of the adjusting groove (511) is connected to an elastic pin (74) that can retract into the fixing ring (51). A pressing key (75) parallel to the axis of the fan blade (52) is slidably connected to the adjusting groove (511) along the vertical direction on the side away from the elastic pin (74). One ends of the plurality of pressing keys (75) away from the fan blade (52) all extend out of the adjusting groove (511) and are located below the pressing ring (72).

6. The annealing furnace heating system according to claim 5, wherein: The pressing cylinder (71) is in contact connection with the pressing ring (72). A plurality of reset springs (76) are circumferentially connected to the adjusting shaft (6) at the stepped position, and a jacking ring (77) is commonly connected to the tops of the plurality of reset springs (76). The jacking ring (77) is slidably sleeved on the adjusting shaft (6), and the top of the jacking ring (77) abuts against the pressing ring (72).

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