Roller hearth type heat treatment device and metal plate heat treatment method

Abstract

The invention belongs to the technical field of metal heat treatment, and particularly relates to a roller bottom type heat treatment device and a metal plate heat treatment method.The heat treatment device comprises a heat treatment furnace body, a feeding roller bed mechanism, a discharging roller bed mechanism and a quenching tank, and the feeding roller bed mechanism comprises a feeding roller transmission device and a plurality of feeding rollers; a plurality of independent in-furnace roller transmission devices are arranged in the heat treatment furnace body in the length direction; compared with the prior art, the roller hearth type heat treatment device has the beneficial effects that the in-furnace roller transmission form of the roller hearth type heat treatment device has the advantages of collective transmission and independent transmission; a plurality of independent in-furnace roller transmission devices are arranged in a furnace body of the heat treatment furnace in the length direction, and each in-furnace roller transmission device is provided with an alternating current speed regulation speed reducer and a swinging crawling alternating current speed regulation speed reducer; the quenching roller way frame can meet the quenching requirements of metal plates with different specifications and special shapes; and the appearance defect of the plate possibly caused when the plate is taken out of the quenching tank by using a crane or a manipulator is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to a roller bottom heat treatment device and a metal plate heat treatment method. Background Art

[0002] The transmission forms of roller-type heat treatment furnaces in the prior art are generally collective transmission and individual transmission. In collective transmission, all rollers are driven by a reducer at the same time. During the operation of the heat treatment furnace, the reducer needs to adjust the speed within a large range, which brings the following technical problems: (1) Transmission loss: When the reducer adjusts the speed, the meshing and speed change process of the gears will cause a certain amount of energy loss, thereby affecting the overall transmission efficiency; (2) Increased cost: In order to achieve a larger speed adjustment range, a more complex gear system or worm gear transmission may be required, which not only increases the manufacturing cost, but also may increase the difficulty of maintenance; (3) Reduced efficiency: When the reducer is running at high speed or the load changes greatly, the efficiency may decrease, affecting the overall performance. In addition, the centralized transmission form does not support swing heating / heating in the heat treatment furnace.

[0003] When the furnace roller transmission adopts a separate transmission control mode, the main disadvantages include: (1) High equipment cost: Since the separate transmission control mode requires a more complex control system and more sensors, the initial investment cost of the equipment is relatively high; (2) High maintenance difficulty: The number of furnace rollers in the separate transmission control mode is large, and the maintenance workload is large. The failure of any roller may affect the operation of the entire system, increasing the complexity and difficulty of maintenance; (3) High energy consumption: Although the separate transmission control mode has certain advantages in increasing production capacity and reducing energy consumption, in actual operation, due to complex control, the energy consumption is relatively high, which is not conducive to long-term economic benefits; (4) Complex control: The separate transmission control mode requires highly precise control algorithms and complex programming to ensure the coordinated work of each roller, which requires high professional skills of the operator and also increases the possibility of system failure.

[0004] In addition, when taking out the metal plates in the quenching tank, a crane or a traveling crane is mainly used to lift the plates, which is inefficient and easily causes deformation or damage of the plates during the lifting process; the discharge roller needs to be lifted away during the maintenance of the heat treatment furnace body.

[0005] In this context, the project invented a roller bottom heat treatment device and a method for heat treatment of metal sheets. Summary of the invention

[0006] In view of the above problems, the present invention provides a roller bottom heat treatment device and a metal plate heat treatment method.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a roller bottom heat treatment device, including a heat treatment furnace body, a feed roller mechanism, a discharge roller mechanism and a quenching tank, characterized in that the feed roller mechanism includes a feed roller transmission device and a plurality of feed rollers; the inner length direction of the heat treatment furnace body is divided into a plurality of independent furnace roller transmission devices.

[0008] Preferably, each of the in-furnace roller transmission devices is equipped with an AC speed-regulating reducer and a swinging and creeping AC speed-regulating reducer, and switching and alternating actions are achieved by an electromagnetic clutch; the speed ratio of the AC speed-regulating reducer is smaller than the speed ratio of the swinging and creeping AC speed-regulating reducer, and the power of the AC speed-regulating reducer is greater than the power of the swinging and creeping AC speed-regulating reducer.

[0009] Preferably, the output shaft of the AC speed reducer is connected to coupling 1, the coupling 1 cooperates with electromagnetic clutch 1, and the electromagnetic clutch 1 cooperates with sprocket 1; the output shaft of the swing and creeping AC speed reducer is connected to coupling 2, the coupling 2 cooperates with electromagnetic clutch 2, and the electromagnetic clutch 2 cooperates with sprocket 2; the same chain is sleeved on the outer periphery of sprocket 1 and sprocket 2, and the chain can drive all furnace rollers in a furnace roller transmission device.

[0010] Preferably, the discharging roller mechanism comprises a track and a discharging roller frame, the length direction of the track is parallel to the width direction of the heat treatment furnace body, the lower part of the discharging roller frame is slidingly or rollingly connected to the track, and the upper part of the discharging roller frame is equipped with a discharging roller transmission device and a plurality of discharging rollers.

[0011] Preferably, a rack is installed on the track, a gear and a gear driving mechanism are installed on the discharge roller frame, and the gear and the rack are meshed.

[0012] Preferably, the feed roller transmission device and the discharge roller transmission device are respectively equipped with two AC speed regulating reducers.

[0013] Preferably, a quenching roller frame capable of sliding up and down is installed above the quenching tank, and the quenching roller frame is a three-dimensional frame, a plurality of quenching rollers are installed at the lower part of the three-dimensional frame, a quenching roller transmission device is installed at the upper part of the three-dimensional frame, and the quenching roller transmission device includes a quenching roller drive motor; a vertical linear telescopic device is installed above the three-dimensional frame, and the linear telescopic device can drive the quenching roller frame to move up and down.

[0014] A method for heat treating a metal sheet, using the roller bottom heat treatment device to heat treat the metal material, comprises the following steps: Step 1: The metal sheet enters the heat treatment furnace body through the feed roller. During this process, the AC speed-regulating reducer in the feed roller transmission device drives the feed roller to rotate at high speed. At the same time, the AC speed-regulating reducer of the furnace roller transmission device at the feed end of the heat treatment furnace body drives the corresponding furnace roller to rotate at high speed. Step 2: Close the feeding furnace door, and the swing creeping AC speed regulating reducer in the multiple roller transmission devices in the furnace drives the metal plate to move at a low speed in the heat treatment furnace body; the metal plate passes through the heating zone and the soaking zone in the heat treatment furnace body in turn; Step 3: After the metal sheet has been in the heat treatment furnace for a set time, it is taken out of the furnace at high speed. During this process, the AC speed-regulating reducer in the discharge roller transmission device drives the discharge roller to rotate at high speed. At the same time, the AC speed-regulating reducer of the furnace roller transmission device at the discharge end of the heat treatment furnace body drives the corresponding furnace roller to rotate at high speed. In step 4, the metal sheet enters the quenching roller frame through the discharge roller, and the linear telescopic device drives the metal sheet on the quenching roller to quickly enter the quenching tank. After the quenching time is reached, the linear telescopic device drives the quenching roller frame to move up and reset, and then the quenching roller drive motor drives the quenching roller to rotate, and the quenched metal sheet is moved to the next process.

[0015] Preferably, the low-speed movement of the metal sheet in the heat treatment furnace body in step 2 is a uniform movement from the feed end to the discharge end, or includes swinging back and forth on the furnace rollers corresponding to one or more independent furnace roller transmission devices.

[0016] Preferably, the metal sheet is a titanium alloy sheet, and the quenched metal sheet is moved to an aging treatment process.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are: (1) The length direction of the heat treatment furnace body is divided into a plurality of independent furnace roller transmission devices, each furnace roller transmission device is equipped with an AC speed regulating reducer and a swing creeping AC speed regulating reducer; thus, the furnace roller transmission form of the roller bottom heat treatment device of the present invention has the advantages of both collective transmission and individual transmission; (2) The loading and unloading actions are completed in the high-speed zone to avoid large temperature fluctuations in the heat treatment furnace body caused by loading or unloading; (3) During continuous annealing, the furnace moves in a variable frequency manner in the low speed zone. When the furnace needs to swing, it also moves forward and backward in the low speed zone. The low-power swing creeping AC speed reducer completes the two actions in the low speed zone; it saves energy and avoids transmission loss, and has high transmission efficiency; (4) The metal sheet enters the quenching roller frame through the discharge roller, and the linear telescopic device drives the metal sheet on the quenching roller to quickly enter the quenching tank; this design can meet the maximum time from the sheet being taken out of the furnace to falling into the quenching tank should be ≤6s; at the same time, it can meet the quenching requirements of metal sheets of different specifications and special shapes; it avoids the appearance defects of the sheet that may be caused when the sheet is taken out of the quenching tank by a crane or a manipulator in the prior art; (5) When the heat treatment furnace body needs to be maintained or repaired, the discharge roller frame can be controlled to move along the track, which is very convenient; (6) The metal sheet swings back and forth on the furnace rollers corresponding to one or more independent furnace roller transmission devices to meet the diverse heat treatment requirements of the metal sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the invention, the following is a brief introduction to the drawings required for describing the embodiment: Figure 1 This is the front view of the roller bottom heat treatment device; Figure 2 It is a top view of a roller bottom heat treatment device; Figure 3 Schematic diagram of the quenching roller stand in the roller bottom heat treatment device.

[0019] Description of reference numerals: 1-heat treatment furnace body, 2-feed roller mechanism, 3-discharge roller mechanism, 4-AC speed regulating reducer; 5-swinging and creeping AC speed regulating reducer, 6-track, 7-quenching roller frame, 8-quenching roller driving motor, 9-linear telescopic device. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1 like Figure 1 and Figure 2 As shown, a roller bottom heat treatment device includes a heat treatment furnace body 1, a feed roller mechanism 2, a discharge roller mechanism 3 and a quenching tank, wherein the feed roller mechanism 2 includes a feed roller transmission device and a plurality of feed rollers; the heat treatment furnace body 1 is divided into a plurality of (five in this embodiment) independent furnace roller transmission devices in the length direction.

[0022] like Figure 1 and Figure 2As shown, each roller transmission device in the furnace is equipped with an AC speed regulating reducer 4 (R107DM160L4, 11KW) and a swing and creeping AC speed regulating reducer 5 (R97DM132M4, 1.1KW), and the switching and alternating actions are realized by an electromagnetic clutch; the speed ratio of the AC speed regulating reducer 4 is smaller than the speed ratio of the swing and creeping AC speed regulating reducer 5, and the power of the AC speed regulating reducer 4 is greater than the power of the swing and creeping AC speed regulating reducer 5.

[0023] The reducer in the roller bottom heat treatment device of the present invention is set to three kinds of movements. The loading and unloading action can be frequency-converted in the high-speed zone, which is completed by the AC speed-regulating reducer 4. During continuous annealing, it is frequency-converted in the low-speed zone. When the furnace needs to swing, it also makes forward and reverse movements in the low-speed zone. The swinging and creeping AC speed-regulating reducer 5 completes the two actions in the low-speed zone. The switching of the two speeds is achieved by an electromagnetic clutch.

[0024] The output shaft of the AC speed regulating reducer 4 is connected to coupling 1, coupling 1 cooperates with electromagnetic clutch 1, and electromagnetic clutch 1 cooperates with sprocket 1; the output shaft of the swinging and creeping AC speed regulating reducer 5 is connected to coupling 2, coupling 2 cooperates with electromagnetic clutch 2, and electromagnetic clutch 2 cooperates with sprocket 2; the same chain is sleeved on the outer periphery of sprocket 1 and sprocket 2, and the chain can drive all furnace rollers in a furnace roller transmission device.

[0025] like Figure 2 As shown, the discharge roller mechanism 3 includes a track 6 and a discharge roller frame. The length direction of the track 6 is parallel to the width direction of the heat treatment furnace body 1. The lower part of the discharge roller frame is connected to the track 6 by sliding or rolling. The upper part of the discharge roller frame is equipped with a discharge roller transmission device and multiple discharge rollers.

[0026] A rack is installed on the track 6, and a gear and a gear driving mechanism are installed on the discharge roller frame, and the gear and the rack are meshed.

[0027] The feed roller transmission device and the discharge roller transmission device are respectively equipped with two AC speed regulating reducers 4.

[0028] A quenching roller stand 7 capable of sliding up and down is installed above the quenching tank. Figure 3 As shown, the quenching roller frame 7 is a three-dimensional frame, a plurality of quenching rollers are installed at the lower part of the three-dimensional frame, a quenching roller transmission device is installed at the upper part of the three-dimensional frame, and the quenching roller transmission device includes a quenching roller drive motor 8; a vertical linear telescopic device 9 (a hydraulic cylinder in this embodiment) is installed above the three-dimensional frame, and the linear telescopic device 9 can drive the quenching roller frame 7 to move up and down.

[0029] A method for heat treating a metal sheet, using the above roller bottom heat treatment device to heat treat the metal material, comprises the following steps: Step 1: The metal sheet enters the heat treatment furnace body 1 through the feed roller. During this process, the AC speed-regulating reducer 4 in the feed roller transmission device drives the feed roller to rotate at high speed. At the same time, the AC speed-regulating reducer 4 of the furnace roller transmission device at the feed end of the heat treatment furnace body 1 drives the corresponding furnace roller to rotate at high speed. Step 2: Close the feeding furnace door, and the swing creeping AC speed regulating reducer 5 in the multiple roller transmission devices in the furnace drives the metal plate to move at a low speed in the furnace body 1 of the heat treatment furnace; the metal plate passes through the heating zone and the soaking zone in the furnace body 1 of the heat treatment furnace in sequence; Step 3: After the metal sheet has been in the heat treatment furnace body 1 for a set time, it is taken out of the furnace at high speed. During this process, the AC speed-regulating reducer 4 in the discharging roller transmission device drives the discharging roller to rotate at high speed. At the same time, the AC speed-regulating reducer 4 of the furnace roller transmission device at the discharging end of the heat treatment furnace body 1 drives the corresponding furnace roller to rotate at high speed. In step 4, the metal sheet enters the quenching roller frame 7 through the discharge roller, and the linear telescopic device 9 drives the metal sheet on the quenching roller to quickly enter the quenching tank. After the quenching time is reached, the linear telescopic device 9 drives the quenching roller frame 7 to move up and reset, and then the quenching roller drive motor 8 drives the quenching roller to rotate, and the quenched metal sheet is moved to the next process.

[0030] In step 2, the low-speed movement of the metal sheet in the heat treatment furnace body 1 is a uniform movement from the feed end to the discharge end, or includes swinging back and forth on the furnace rollers corresponding to one or more independent furnace roller transmission devices.

[0031] The metal sheet is a titanium alloy sheet, and the quenched metal sheet is moved to an aging treatment process.

[0032] Example 2 The difference between this embodiment and the embodiment 1 is that the feed roller transmission device and the discharge roller transmission device are respectively equipped with an AC speed regulating reducer 4.

[0033] Example 3 The difference between this embodiment and the first embodiment is that the length direction of the heat treatment furnace body 1 is divided into six independent furnace roller transmission devices.

[0034] The metal plate is a steel plate, and the quenched metal plate is moved to a tempering process.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A roller-type heat treatment device, comprising a heat treatment furnace body (1), a feed roller mechanism (2), a discharge roller mechanism (3) and a quenching tank, characterized in that: The feed roller mechanism (2) comprises a feed roller transmission device and a plurality of feed rollers; the length direction of the heat treatment furnace body (1) is divided into a plurality of independent furnace roller transmission devices.

2. The roller bottom heat treatment device according to claim 1, characterized in that: Each of the furnace roller transmission devices is equipped with an AC speed regulating reducer (4) and a swing and creeping AC speed regulating reducer (5), and the switching and alternating actions are realized by an electromagnetic clutch; the speed ratio of the AC speed regulating reducer (4) is smaller than the speed ratio of the swing and creeping AC speed regulating reducer (5), and the power of the AC speed regulating reducer (4) is greater than the power of the swing and creeping AC speed regulating reducer (5).

3. The roller bottom heat treatment device according to claim 2, characterized in that: The output shaft of the AC speed-regulating reducer (4) is connected to coupling 1, the coupling 1 cooperates with electromagnetic clutch 1, and the electromagnetic clutch 1 cooperates with sprocket 1; the output shaft of the swing and creeping AC speed-regulating reducer (5) is connected to coupling 2, the coupling 2 cooperates with electromagnetic clutch 2, and the electromagnetic clutch 2 cooperates with sprocket 2; the same chain is sleeved on the outer periphery of sprocket 1 and sprocket 2, and the chain can drive all the furnace rollers in a furnace roller transmission device.

4. The roller bottom heat treatment device according to claim 2, characterized in that: The discharge roller mechanism (3) comprises a track (6) and a discharge roller frame, the length direction of the track (6) is parallel to the width direction of the heat treatment furnace body (1), the lower part of the discharge roller frame is connected to the track (6) by sliding or rolling, and the upper part of the discharge roller frame is equipped with a discharge roller transmission device and a plurality of discharge rollers.

5. The roller bottom heat treatment device according to claim 4, characterized in that: A rack is installed on the track (6), a gear and a gear drive mechanism are installed on the discharge roller frame, and the gear and the rack are meshed.

6. The roller-type heat treatment device according to claim 5, characterized in that: The feed roller transmission device and the discharge roller transmission device are respectively equipped with two AC speed regulating reducers (4).

7. The roller bottom heat treatment device according to claim 6, characterized in that: A quenching roller frame (7) capable of sliding up and down is installed above the quenching tank. The quenching roller frame (7) is a three-dimensional frame. A plurality of quenching rollers are installed at the bottom of the three-dimensional frame. A quenching roller transmission device is installed at the top of the three-dimensional frame. The quenching roller transmission device includes a quenching roller drive motor (8). A vertical linear telescopic device (9) is installed above the three-dimensional frame. The linear telescopic device (9) can drive the quenching roller frame (7) to move up and down.

8. A method for heat treatment of a metal sheet, characterized in that: The roller bottom heat treatment device according to claim 7 is used to heat treat a metal material, comprising the following steps: Step 1: The metal sheet enters the heat treatment furnace body (1) through the feed roller. During this process, the AC speed-regulating reducer (4) in the feed roller transmission device drives the feed roller to rotate at high speed. At the same time, the AC speed-regulating reducer (4) of the furnace roller transmission device at the feed end of the heat treatment furnace body (1) drives the corresponding furnace roller to rotate at high speed. Step 2: The feeding furnace door is closed, and the swing creeping AC speed regulating reducer (5) in the multiple roller transmission devices in the furnace drives the metal plate to move at a low speed in the furnace body (1) of the heat treatment furnace; the metal plate passes through the heating zone and the soaking zone in the furnace body (1) of the heat treatment furnace in sequence; Step 3: After the metal sheet has been in the heat treatment furnace body (1) for a set time, it is taken out of the furnace at high speed. During this process, the AC speed-regulating reducer (4) in the discharge roller transmission device drives the discharge roller to rotate at high speed. At the same time, the AC speed-regulating reducer (4) of the furnace roller transmission device at the discharge end of the heat treatment furnace body (1) drives the corresponding furnace roller to rotate at high speed. In step 4, the metal sheet enters the quenching roller frame (7) through the discharge roller, and the linear telescopic device (9) drives the metal sheet on the quenching roller to quickly enter the quenching tank. After the quenching time is reached, the linear telescopic device (9) drives the quenching roller frame (7) to move up and reset, and then the quenching roller drive motor (8) drives the quenching roller to rotate, and the quenched metal sheet is moved to the next process.

9. The metal sheet heat treatment method according to claim 8, characterized in that: In the step 2, the low-speed movement of the metal sheet in the heat treatment furnace body (1) is a uniform movement from the feed end to the discharge end, or includes swinging back and forth on the furnace rollers corresponding to one or more independent furnace roller transmission devices.

10. The metal sheet heat treatment method according to claim 8, characterized in that: The metal plate is a titanium alloy plate, and the quenched metal plate is moved to an aging treatment process.

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