KR101009916B1 - Multi-stage heating furnace - Google Patents

Abstract

PURPOSE: A multi-stage heating furnace is provided to efficiently heat metal materials because a single chamber is divided into multiple compartments to place the metal materials in multiple stages. CONSTITUTION: A multi-stage heating furnace comprises a main body(10), a lifting frame(40), a plurality of doors(50), a plurality of locking apparatuses(60), and a lifting apparatus(70). The main body has a chamber for heating a plurality of metal materials and an entrance connected to the chamber. The chamber is divided into a plurality of compartments with a plurality of shelves. The lifting frame is installed to ascend and descend in the front of the entrance and has a space connected to the entrance. The doors, having a pair of locking holes on ends, are arranged in the space to open/close the compartments, respectively. The locking apparatuses lock the doors in the lifting frame and comprise a pair of actuators installed on both sides of the lifting frame and a pair of locking pins which are inserted in the locking holes by the operation of the actuators. The lifting apparatus is connected to the lifting frame in order to raise and lower the lifting frame.

Description

Multi-stage heating furnace {MULTI-STAGE HEATING FURNACE}

The present invention relates to a multi-stage heating furnace, and more particularly to a multi-stage heating furnace that can be heated by placing a metal material in multiple stages.

The furnace is a furnace for heating metal materials, and is classified into heat treatment, forging, rolling, and the like depending on the use. Heating furnaces for heat treatment include quenching furnaces, annealing furnaces, and soaking furnaces. Hot-stamping is an example of a metal material. The cold-rolled steel sheet is heated at a high temperature in a heating furnace, press-formed the heated metal material, and then hardened in a mold to increase the strength of the metal material. Height is construction method. Hot stamping is used to manufacture automotive parts such as impact beams, center pillars, etc., because of excellent moldability of metal materials and high strength.

As disclosed in US Pat. No. 6,564,604, hot stamping is an inline system in which various processes such as feeding, cutting, heating, forming and cooling a sheet of steel from a metallic material are used to improve productivity. Consists of. Therefore, the hot stamping line for manufacturing automotive parts takes up a lot of installation space. In the furnace, the cut sheet blank must be heated to high temperature for several minutes, so the heating process is a bottleneck process that generates dead time in the hot stamping line. There is a problem.

Korean Patent No. 10-0907265 discloses a technology for reducing the installation space and solving the bottleneck process by the rotary table for hot stamping furnace. The technique of this patent document consists of a plurality of frames provided at equal intervals on the upper edge of the rotating plate, a plurality of heating furnaces provided in multiple stages on the frames, and a driving device for rotating the rotating plate. The rotating plate is rotated to the loading portion of the metal material by the driving device. When one of the plurality of frames reaches the loading position by the rotation of the rotating plate, the operator loads or unloads the metal material with respect to one of the plurality of heating furnaces. However, the hot stamping furnace has a limitation in reducing the installation space due to the structure in which a plurality of frames and a plurality of heating furnaces are installed on the rotating plate. In addition, the heating furnaces are configured individually, there is a problem that takes a lot of equipment costs and maintenance costs.

The present invention has been made to solve the above problems, an object of the present invention is to provide a multi-stage heating furnace that can be heated by placing a plurality of metal materials in multiple stages.

Another object of the present invention is to provide a multi-stage heating furnace capable of opening only one compartment of a plurality of compartments in which a metal material is placed by a plurality of doors and closing the remaining compartments.

Still another object of the present invention is to provide a multi-stage heating furnace having a simple structure and capable of simultaneously heating a plurality of metal materials, thereby minimizing installation space and reducing installation cost and maintenance cost.

A feature of the present invention for achieving the above objects, has a chamber for heating a plurality of metal materials, has an inlet connected to the chamber to load the plurality of metal materials into the chamber, the chamber is a plurality of metal A main body partitioned into a plurality of compartments by a plurality of shelves so that each of the materials can be layered; A lifting frame which is installed to move up and down in front of the inlet, and has a space connected to the inlet; A plurality of doors arranged in a space to open and close each of the plurality of compartments, and having a pair of locking holes formed at both ends thereof; Operation of a pair of actuators and a pair of actuators mounted on both sides of the lifting frame by locking each of the doors to the lifting frame so that each of the lifting frames and the plurality of doors are elevated together to open and close each of the plurality of compartments. A plurality of locking devices having a pair of locking pins adapted to fit the pair of locking holes by There is a multi-stage heating furnace comprising a lifting device connected with the lifting frame for lifting the lifting frame.

Since the multi-stage heating furnace according to the present invention is partitioned into a plurality of compartments in which a single chamber can hold a plurality of metal materials in multiple stages, the metal materials can be efficiently heated. Only one of the compartments is opened by a plurality of doors to load the metal material, and the remaining compartments can continuously heat the metal material in a closed state, thereby preventing loss of thermal energy required for heating. In addition, the cost of equipment and maintenance can be reduced. In addition, the structure is simple, but a plurality of metal materials are placed in a plurality of compartments at the same time heated by the structure to reduce the installation space in the hot stamping line, etc., there is an effect that can improve the productivity by preventing bottlenecks.

1 is a perspective view showing the configuration of a multi-stage heating furnace according to the present invention,
2 is a front view showing the configuration of the doors are closed in the multi-stage heating furnace according to the present invention,
3 is a cross-sectional view taken along line III-III of FIG. 2;
Figure 4 is a left side view showing the configuration of the multi-stage heating furnace according to the present invention,
5 is a right side view showing the configuration of the multi-stage heating furnace according to the present invention,
Figure 6 is a perspective view showing the configuration of the lifting frame, the lifting device and the balancing device in a multi-stage heating furnace according to the present invention,
7 is a front view showing the configuration of the doors and the locking device in a multi-stage heating furnace according to the present invention,
8 is a cross-sectional view taken along line VII-VII of FIG. 7;
Figure 9 is a front view showing the configuration of the second door of the open state in the multi-stage heating furnace according to the present invention,
10 is a cross-sectional view taken along line VII-VII of FIG. 9.
11 is a front view showing another embodiment of the multi-stage heating furnace according to the present invention,
12 is a cross-sectional view taken along the line II-XIII of FIG. 11.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of a multi-stage heating furnace according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIGS. 1 to 5, the heating furnace according to the present invention includes a main body 10 constituting an external appearance. The main body 10 can be placed in multiple stages along the height direction of the plurality of metal materials 2 by the combination of the upper plate 12a, the lower plate 12b, the right plate 12c, the seat plate 12d and the rear plate 12e. Which has a chamber 14. An inlet 16 is formed on the front of the body 10 to be connected to the chamber 14 for loading and unloading the metal materials 2.

As shown in FIG. 3, the chamber 14 includes a plurality of compartments 18; 18-1, 18-2, and 18-such that the metal layers 2 can be layered by the plurality of shelves 20. 3,…, 18-n). Shelves 20 are composed of a plurality of support bars (22) partitioning the chamber 14 to put the metal material (2). Both ends of the support bars 22 are fixed to both inner surfaces of the chamber 14. The support bars 22 are disposed on the same horizontal plane in each of the compartments 18 to stably support the metal materials 2. Although six compartments 18 are shown in FIG. 3, this is exemplary and the number of compartments 18 may be appropriately increased or decreased as necessary. A plurality of heaters 30 are mounted on both inner surfaces of the chamber 14 as a means for heating. The heaters 30 may be composed of a coil heater 32 and a ceramic heater.

1 to 3, 6 and 7, the multi-stage heating furnace according to the present invention is a lifting frame (Lift frame) 40 and a plurality of doors that are installed to be elevated in front of the main body (10) 50; 50-1, 50-2, 50-3, ..., 50-n). The lifting frame 40 is configured in a quadrangular shape with a space 42 aligned with the inlet 16 therein. The doors 50 are arranged in layers 42 in the space 42 of the lifting frame 40 so as to open and close the front of each of the compartments 18, and are arranged in the space 42 so as to align with the same vertical plane. A pair of locking holes 52 are formed at both ends of each of the doors 50.

As shown in FIG. 8, two adjacent doors 50 of the doors 50 have protrusions 54 and grooves 56 to fit with each other. The protrusion 54 is formed at the top of the doors 50. The grooves 56 are formed at the lower ends of the doors 50. The gap between the two adjacent doors 50 can be minimized by the fitting of the protrusion 54 and the groove 56.

1, 2, 6 and 7, a multi-stage heating furnace according to the present invention includes a plurality of locks for locking or unlocking each of the lifting frame 40 and the doors 50. Locking device 60; 60-1, 60-2, 60-3, ..., 60-n. The locking devices 60 are composed of a pair of actuators 62 and a pair of locking pins 64. The actuators 62 are mounted to the lifting frame 40 so as to approach both ends of each of the doors 50. The locking pins 64 are connected to each of the actuators 62 to be actuated by the driving of each of the actuators 62. When the actuators 62 are driven, the locking pins 64 are advanced to fit the locking holes 52, thereby locking the lifting frame 40 and the door 50. As shown in FIG. In FIG. 7, the first and second doors 50-1, 50-2 are lifted by the locking of the first and second locking devices 60-1, 60-2 so that the second one of the compartments 18 can be seen. It is shown by way of example that 18-2 is open. The actuators 62 may be variously configured as an air actuator, a hydraulic actuator, a solenoid actuator, or the like. In the present embodiment, the first door 50-1 disposed at the top of the doors 50 is fixed to the lifting frame 40, and the first locking device 60-1 may be deleted. When the first door 50-1 is fixed to the lifting frame 40, the first door 50-1 is moved up and down with the lifting frame 40 to open and close the first compartment 18-1.

1, 2, 4, 6 and 9, the multi-stage heating furnace according to the present invention includes a lifting device 70 for lifting the lifting frame 40. The linear actuator 72 of the elevating device 70 is linearly moved for elevating the lifting frame 40. The linear actuator 72 is comprised by the air cylinder 74. As shown in FIG. The cylinder housing 74a of the air cylinder 74 is fixed perpendicularly to one side of the main body 10, that is, the lower portion of the seat plate 12d. The cylinder rod 74b of the air cylinder 74 is connected to the upper end of the cylinder housing 74a to be advanced or retracted.

The chain drive 76 of the elevating device 70 transmits the linear motion of the linear actuator 72 to the lifting frame 40. The chain transmission 76 is composed of a first sprocket wheel 76a, a second sprocket wheel 76b, a third sprocket wheel 76c, a first chain 76d and a second chain 76e. have. The first sprocket wheel 76a is mounted to rotate on an upper side of the main body 10. The second sprocket wheel 76b is rotatably mounted on an upper side of the main body 10 and is coaxially aligned with the first sprocket wheel 76a. The third sprocket wheel 76c is rotatably mounted on the other upper side of the main body 10, and is aligned in a straight line with the second sprocket wheel 76b. One end of each of the first chain 76d and the second chain 76e is connected by a cylinder rod 74b and turnbuckles 78a and 78b. The operator can easily adjust the tension of the first and second chains 76d and 76e by the turnbuckles 78a and 78b. The other end of the first chain 76d is connected to the upper one side of the lifting frame 40 via the first sprocket wheel 76a. The other end of the second chain 76e is connected to the upper other side of the lifting frame 40 via the second sprocket wheel 76a and the third sprocket wheel 76c sequentially.

In this embodiment, the elevating device 70 may be composed of a servo motor, a lead screw, a ball nut, a guide rail, and a slider. When the lead screw is rotated by the drive of the servomotor, the ball nut is screwed along the rotated lead screw. The slider is coupled to the ball nut and moves with the ball nut. The slider is linearly moved while sliding along the guide rail. The slider may be directly coupled to the lifting frame 40 or connected to the lifting frame 40 by a chain transmission 76. In addition, the chain transmission device 76 of the elevating device 70 may be configured as a rope transmission device.

1, 2, 5, 6 and 9, the multi-stage heating furnace according to the present invention a balancing device for balancing the lifting frame 40 is elevated by the operation of the lifting device 70 (Balancing device: 80). The balancing device 80 is composed of a balance weight 82 and a chain transmission device 84. The balance weight 82 is located in the opposite direction to the air cylinder 74 and is arranged to move up and down on the other side, that is, to the right side of the main body 10.

The chain transmission device 84 is comprised from the 1st-8th sprocket wheels 84a-84h, the 1st chain 84i, and the 2nd chain 84j. The first sprocket wheel 84a is mounted to rotate on the other side of the main body 10. The second sprocket 84b is mounted on the other side of the main body 10 so as to be rotated, and is coaxially aligned with the first sprocket wheel 84a. The third sprocket wheel 84c is mounted to rotate on the lower side of the other side of the main body 10 and is aligned with the first sprocket wheel 84a on a vertical line. The fourth sprocket wheel 84d is mounted to rotate below the other side of the main body 10, is aligned with the second sprocket wheel 84b in a vertical line, and is coaxially aligned with the third sprocket wheel 84c. have. The fifth sprocket wheel 84e is mounted to be rotated on the lower right front side of the main body 10 and is in close proximity to the third sprocket wheel 84c. The sixth sprocket wheel 84f is mounted to be rotated on the lower right front side of the main body 10, is close to the fourth sprocket wheel 84d, and is coaxially aligned with the fifth sprocket wheel 84e. The seventh sprocket wheel 84g is mounted to be rotated at the lower center of the front surface of the main body 10. The eighth sprocket wheel 84h is mounted to rotate on the lower left front side of the main body 10.

One end of the first chain 84i is fixed to the balance weight 82. The other end of the first chain 84i is fixed to the front lower right side of the lifting frame 40 via the first sprocket wheel 84a, the third sprocket wheel 84c and the fifth sprocket wheel 84e. One end of the second chain 84j is fixed to the balance weight 82. The other end of the second chain 84j is fixed to the lower left front side of the lifting frame 40 via the second sprocket wheel 84b, the fourth sprocket wheel 84d, and the sixth to eighth sprocket wheels 84f to 84h. It is. The second chain 84j is supported on the upper portion of the outer surface of the seventh sprocket wheel 84g to prevent sagging.

1, 2 and 5, the multi-stage heating furnace according to the present invention of the heaters 30, the actuators 62 of the locking devices 60 and the air cylinder 74 of the elevating device 70 And a controller 90 for controlling the operation. The controller 90 is installed at one side of the main body 10, and opens and closes the doors 50 by sequence control of the actuators 62 and the air cylinder 74.

From now on, the operation | movement with respect to the multistage heating furnace which concerns on this invention which has such a structure is demonstrated.

2, 7 and 8, if the locking pins 64 are pulled out of the locking holes 52 of the doors 50 when the lifting frame 40 is raised by the operation of the lifting device 70, The doors 50 do not open. The doors 50 prevent the release of heat from the chamber 14 by minimizing the gap between two adjacent doors 50 by the fitting of the protrusion 54 and the groove 56. Therefore, the temperature of the chamber 30 can be maintained uniformly by the operation of the heaters 30, and the metal material 2 can be efficiently heated.

7, 9, and 10, when the second door 50-2 of the doors 50 is to be opened, the first of the locking devices 60 is controlled by the controller 90. And the actuators 62 of the second locking devices 60-1, 60-2 are operated. By operation of the actuators 62, the locking pins 64 are advanced and fitted into the locking holes 52 of the first and second doors 50-1 and 50-2, respectively. Thus, the first and second doors 50-1 and 50-2 are locked to the lifting frame 40 by the first and second locking devices 60-1 and 60-2, and the third door 50-. 3) is unlocked to the lifting frame 40.

As shown by arrow " A " in FIG. 9, the cylinder rod 74b of the air cylinder 74 retracts and pulls the first and second chains 76d and 76e. When the first and second chains 76d and 76e are pulled, the lifting frame 40, which is connected to the first and second chains 76d and 76e, as shown by the arrow " B " Is raised. When the lifting frame 40 is raised, the first and second doors 50-1 and 50-2 which are locked by the first and second locking devices 60-1 and 60-2 are lifted by the lifting frame 40. Open up with). From the third door 50-3, the last door 50-n is not opened. The second door 50-2 is raised together with the first door 50-1 to close the first compartment 18-1.

9 and 10, when the lifting of the lifting frame 40 is stopped, the first compartment 18-1 is closed by the second door 50-2 and the second compartment 18-2. Will be open. Thus, the worker loads the metal material 2 onto the support bars 22 of the second compartment 18-2 through the inlet 16 or heats the metal material 2 from the second compartment 18-2. Can be unloaded. When the loading or unloading of the metal material 2 is completed, when the cylinder rod 74b of the air cylinder 74 is advanced, the first and second chains 76d and 76e which are pulled out are released, and the lifting frame 40 is removed. It will descend. When the lowering of the lifting frame 40 stops, the actuators 62 of the first and second locking devices 60-1 and 60-2 are actuated, and the locking pins 64 are retracted to the first and second doors. The locking holes 52 of the 50-1 and 50-2 are pulled out.

On the other hand, the locking pins 64 of the first to the last locking devices 60-1 to 60-n are all locked in the locking holes 52 of the first to the last doors 50-1 to 50-n. If it is, the first to the last door (50-1 ~ 50-n) are all lifted together by the lifting of the lifting frame 40 to open and close the last compartment (18-n).

As such, as the lifting frame 40 is raised, only the compartments of the compartments 18 of the chambers 14 that need to be loaded or unloaded can be opened and closed, while the remaining compartments are closed. Since 2) can be heated continuously, it is possible to prevent the loss of thermal energy required for heating, and to reduce the installation cost and maintenance cost. In addition, the multi-stage heating furnace according to the present invention can be heated at the same time by placing a layer of metal material (2) in a plurality of compartments 18, for example, to improve the productivity by preventing bottlenecks in the hot stamping line Can reduce the installation space.

1, 2, 5 and 9, when the lifting frame 40 is raised by the operation of the lifting device 70, the lifting frame 40 to be raised is the first of the chain transmission device 84 And second chains 84i and 84j. When the first and second chains 84i and 84j are pulled, the balance weight 82 is lifted with the lifting frame 40 as shown by arrow "C" in FIG. 9 to balance the lifting frame 40. Stably. When the lifting frame 40 is lowered, the pulled first and second chains 84i and 84j are released to lower the balance weight 82. As such, the balance of the lifting frame 40 lifted by the balancing device 80 is stably maintained, so that the opening and closing operations of the doors 50 can be accurately and smoothly performed.

11 and 12 show another embodiment of a multi-stage heating furnace according to the invention. 11 and 12, the multi-stage heating furnace of another embodiment has inlets 16, 116 formed on the front and rear surfaces of the body 10, respectively. The inlets 16, 116 are the same as described above, lifting frames 40, 140, doors 50; 50-1, 50-2, 50-3, ..., 50-n, 150; 150-1, 150- 2, 150-3, ..., 150-n, locking devices 60; 60-1, 60-2, 60-3, ..., 60-n, 160; 160-1, 160-2, 160-3 , ..., 160-n and can be opened and closed by the lifting devices (70, 170). The balancing device 180 stably balances the lifting frame 140 lifted by the operation of the lifting device 170. Lifting frame 140, door 150 (150-1, 150-2, 150-3, ..., 150-n) of the multi-stage heating furnace of another embodiment, locking device (160; 160-1, 160-2, 160-3, ..., 160-n, the lifting device 170, the balancing device 180 is the lifting frame 40, the door 50 (50-1, 50-2, 50-3, ..., described above) 50-n), the locking device 60 60-1, 60-2, 60-3, ..., 60-n, the lifting device 70, the balancing device 80 and its configuration is the same, so the details Description is omitted.

In the multi-stage heating furnace of another embodiment the metal materials 2 are arranged in one of the inlets 16, 116, for example through the inlets 16, 18-18, 18-2, 18-3, ..., 18-n), each can be loaded and unloaded from the compartments 18 through the inlet 116. As described above, since the inlets 16 and 116 are formed at the front and rear surfaces of the main body 10, the loading and unloading of the metal material 2 can be performed separately. The furnace can be usefully applied to hot stamping lines.

The embodiments described above are merely illustrative of the preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, those skilled in the art within the spirit and claims of the present invention It will be understood that various changes, modifications, or substitutions may be made thereto, and such embodiments are to be understood as being within the scope of the present invention.

10: main body 14: chamber
16, 116: Entrance 18: Khan
20: shelf 30: heater
40, 140: lifting frame 50, 150: door
60, 160: locking device 62: actuator
64: locking pin 70, 170: lifting device
72: linear actuator 74: air cylinder
76: chain drive 80, 180: balancing device
82: balance weight 84: chain drive
90: controller

Claims (11)

The chamber has a chamber for heating a plurality of metal materials, and has an inlet connected to the chamber to load the plurality of metal materials into the chamber, wherein the chamber is capable of layering each of the plurality of metal materials. A main body partitioned into a plurality of compartments by a plurality of shelves;
A lifting frame which is installed to move up and down in front of the inlet, and has a space connected to the inlet;
A plurality of doors disposed in the space to open and close each of the plurality of compartments, and having a pair of locking holes formed at both ends thereof;
A pair of actuators mounted on both sides of the lifting frame by locking the doors to the lifting frame so that each of the lifting frames and the plurality of doors are lifted together to open and close each of the plurality of compartments; A plurality of locking devices having a pair of locking pins that are fitted to the pair of locking holes by operation of the pair of actuators;
And a lifting device connected to the lifting frame to lift the lifting frame. delete The multi-stage heating furnace of claim 1, wherein each of the plurality of doors is disposed in the space so as to be aligned in a vertical plane, and two adjacent doors of the plurality of doors each have protrusions and grooves that are fitted to each other. The multi-stage heating furnace of claim 1, wherein a first door located at the top of the plurality of doors is fixed to the lifting frame. The multi-stage heating furnace of claim 1, wherein each of the plurality of shelves includes a plurality of support bars having both ends fixed to both inner surfaces of the chamber to support each of the plurality of metal materials. According to claim 1, The elevating device,
A linear actuator mounted on one side lower portion of the main body;
And a chain transmission device for transmitting the linear movement of the linear actuator to the lifting frame so that the lifting frame is lifted by the linear movement of the linear actuator. The linear actuator of claim 6, wherein the linear actuator comprises an air cylinder, the chain transmission device has a first chain and a second chain, and the first chain is connected to an upper side of the air cylinder and the lifting frame. And the second chain is connected to the upper other side of the air cylinder and the lifting frame. The multi-stage heating furnace according to claim 7, wherein each of the first chain and the second chain is connected to the air cylinder by a turnbuckle. The multi-stage heating furnace according to claim 1, further comprising a balancing device for maintaining balance of the lifting frame. The method of claim 9, wherein the balancing device,
A balance weight disposed to move up and down on one side of the main body;
And a chain transmission device for connecting the lifting frame and the balance weight so that the lifting frame and the balance weight are lifted together. The method of claim 10, wherein the chain transmission device has a first chain and a second chain, the first chain is connected to the lower side of the balance weight and the lifting frame, the second chain and the balance weight Multi-stage heating furnace is connected to the other side of the lower of the lifting frame.

Images