Uplift type heating furnace for heat treatment of laminated workpiece

Abstract

The invention relates to the technical field of workpiece heating, and discloses a lifting type heating furnace for heat treatment of laminated workpieces, which comprises a base, a position changing device arranged on the base and used for switching loading vessels, enabling heating and loading work to be carried out synchronously and improving heating efficiency, and two sets of containing devices arranged on the position changing device and used for placing the two sets of containing devices on the position changing device. And the lifting device is used in cooperation with the position changing device, is used for containing the workpiece to be heated and provides protection for the workpiece in the heating process, and the lifting device is arranged on the base. The lifting device is arranged, the furnace body is fixedly arranged in a suspended mode, the driving motor is used for driving the lifting plate to vertically ascend and descend, materials are added into the furnace body from the lower portion of the furnace body, operation is easy and convenient, and the problem that an operator needs to climb to the furnace top of an existing heating furnace to load and unload the materials is solved; the containing device is automatically clamped and fixed through the clamping blocks, manual operation is replaced, contact between operators and the containing device is reduced, and the burning risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece heating, and more specifically to a lifting type heating furnace for heat treatment of laminated workpieces. Background Art

[0002] A heating furnace is a device that heats materials or workpieces to the rolling or forging temperature. Heating furnaces are applied in many industrial fields such as petroleum, chemical industry, metallurgy, machinery, heat treatment, surface treatment, building materials, electronics, materials, light industry, daily chemicals, and pharmaceuticals. Traditional heating furnaces are heavy and inconvenient to move. Therefore, general heating furnaces are fixedly installed. When in use, the workpieces to be heated are generally placed in the heating furnace for heating and calcination.

[0003] Generally, a heating furnace uses an upper opening for loading and unloading materials and heats from the bottom. However, the heating furnace itself is large in size, and the opening position is much higher than the operator's height. Each time of loading and unloading requires the use of climbing equipment to send the materials to the top of the heating furnace, which is very inconvenient to operate, and there is a certain operation risk in carrying materials for climbing.

[0004] Especially in this case, the workpiece is a laminated workpiece, with multiple thin layers stacked and strung together and sent into the heating furnace. Therefore, if the laminated workpieces are manually carried to a high place and placed in the heating furnace, the arranged workpieces are likely to be scattered during the carrying process, and the carrying also reduces the efficiency. In view of this, we propose a lifting type heating furnace. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a lifting type heating furnace for heat treatment of laminated workpieces, which solves the problems raised in the above background art.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A lifting type heating furnace for heat treatment of laminated workpieces includes a base. A transposition device is arranged on the base and is used to switch the loading vessels so that the heating and loading operations can be carried out synchronously, improving the heating efficiency. Two sets of holding devices are both arranged on the transposition device and cooperate with the transposition device to hold the workpieces to be heated and provide protection for the workpieces during the heating process. A lifting device is arranged on the base and is used to lift the holding device and send the holding device together with the workpieces into the heating furnace. The furnace body is arranged above the lifting device.

[0010] Preferably, an operating platform is provided at the top of the lifting device. At the bottom of both sides of the operating platform, two groups of support plates are fixedly connected. The bottom ends of the two groups of support plates are fixedly connected to the top surface of the base. The furnace body is fixedly installed on the top surface of the operating platform. A ladder platform is fixedly installed on the top surface of the support plate. A guardrail is fixedly installed around the top surface of the operating platform.

[0011] Preferably, the transposition device includes a through groove, a sliding plate, a loading platform, positioning holes, top rings, magnet one, and magnet two. The through groove is opened on the top surface of the base. The sliding plate is clamped and slidably connected in the through groove. Two groups of loading platforms are respectively fixedly connected to both sides of the top surface of the sliding plate. The positioning holes are evenly opened on the top surface of the loading platform. Two groups of top rings are respectively threadedly connected to the outer walls of the two groups of loading platforms. Two groups of magnet one are respectively embedded on both sides inside the sliding plate, and the two groups of magnet one are coaxially arranged with the two groups of loading platforms respectively. Magnet two is embedded at the center of the bottom surface of the base.

[0012] Preferably, the holding device includes a mounting table, positioning columns, side rings, a holding table, and an isolation cover. The mounting table is placed on the top of the loading platform. The positioning columns are fixedly connected to the bottom surface of the mounting table, and the positioning columns are arranged in one-to-one correspondence with the positioning holes. The side ring is fixedly sleeved on the annular surface of the mounting table. The holding table is fixedly installed on the top surface of the mounting table. The isolation cover is detachably connected to the top surface of the holding table, and the isolation cover completely covers the top surface of the holding table.

[0013] Preferably, the lifting device includes a threaded column, a lifting plate, a threaded sleeve, a driven sprocket, a transmission chain, a driving motor, and a driving sprocket. The threaded column is rotatably connected to the top surface of the base through a bearing. The lifting plate is slidably connected to the threaded column. The threaded sleeve is rotatably connected to the bottom surface of the lifting plate, and the threaded sleeve is threadedly connected to the threaded column. The driven sprocket is fixedly sleeved on the annular surface of the threaded sleeve. The transmission chain is sleeved on the driven sprocket. The driving motor is fixedly installed on the bottom surface of the lifting plate. The driving sprocket is fixedly connected to the output end of the driving motor through a rotating shaft and a coupling. The driving sprocket meshes with the transmission chain, and the driving sprocket tightens the transmission chain. The lifting device further includes a through hole, a chute, a clamping block, and a spring. The through hole is opened at the center of the lifting plate. The chute is opened on the annular surface of the through hole. The clamping block is slidably connected in the chute. One end of the spring is fixedly connected to the clamping block, and the other end of the spring is fixedly connected to the chute.

[0014] Preferably, the outer diameter of the top ring is equal to the aperture of the through hole. This setting ensures that after the heating is completed, when the holding device descends and the clamping block presses against the top ring, the reaction force of the top ring on the clamping block can completely squeeze the clamping block into the chute, thereby ensuring that the holding device can smoothly fall onto the loading platform. The top surface of the top ring is set as a smooth convex surface. By setting the smooth convex surface, the wear between the top ring and the clamping block is reduced, and the service life is increased.

[0015] Preferably, the length of the positioning post is equal to the depth of the positioning hole, and the length of the positioning post is greater than the height of the top ring. Such a setting ensures that during the descent of the containing device, the positioning post first inserts into the positioning hole to position the containing device, and then the top ring is used to press the clamping block into the sliding groove, ensuring that the containing device does not shake randomly during the contraction of the clamping block and finally smoothly falling onto the loading platform.

[0016] Preferably, the lifting device further includes a sliding sleeve, which is fixedly connected to the sliding hole of the lifting plate penetrated by the threaded post. The inner wall of the sliding sleeve abuts against the outer wall of the threaded post, and the inner wall of the sliding sleeve is smooth. By setting the smooth sliding sleeve, while ensuring the stable lifting and lowering of the lifting plate, the wear of the threaded post and the lifting plate is reduced.

[0017] Preferably, the number of the threaded posts is four groups. The four groups of threaded posts are respectively arranged at the four corners of the lifting plate. A threaded sleeve is threadedly connected to each group of threaded posts, and a driven sprocket is sleeved on each group of threaded sleeves. The transmission chain is meshed with the four groups of driven sprockets. By setting four groups of threaded posts, the four groups of threaded sleeves are used to drive the lifting plate to lift and lower simultaneously, making the force on the lifting plate more uniform and improving the stability of the lifting plate during movement.

[0018] Preferably, when the spring is in a natural state, the bottom surface of the section of the clamping block extending out of the sliding groove is set as a smooth inclined surface. Setting the bottom surface of the clamping block as a smooth inclined surface enables a component force of the reaction force received by the inclined surface to exist in the horizontal direction when the clamping block descends and presses against the side ring or the top ring, thereby using this component force to press the clamping block into the sliding groove, realizing automatic extrusion and contraction of the clamping block without manual operation and reducing the risk of being burned.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a lifting type heating furnace for heat treatment of laminated workpieces, having the following beneficial effects:

[0021] 1. By setting the lifting device in the present invention, the furnace body is fixedly suspended, and the driving motor is used to drive the lifting plate to vertically lift and lower, and the material is added into the furnace body from below the furnace body. The operation is simple and convenient, solving the problem that the existing heating furnace requires operators to climb to the top of the furnace for material loading and unloading. By setting the clamping block, the clamping block is used to automatically clamp and fix the containing device, replacing manual operation, reducing the contact between the operator and the containing device, and reducing the risk of being burned.

[0022] 2. By setting the transposition device in the present invention, two loading platforms are arranged on the sliding plate for rotation loading, and the heating and loading operations can be carried out simultaneously, improving the processing efficiency, and solving the problems that the workpiece loading speed of the existing heating furnace is slow, affecting the heating effect and wasting fuel.

[0023] 3. By providing a holding device, the loading table can be quickly installed and disassembled through the cooperation of the positioning rod and the positioning groove. By providing an isolation cover to cover the holding table and sealing the heated workpiece on the holding table, not only can the workpiece be prevented from falling off the holding table during the heating process, but also oxygen can be isolated to avoid damage to the workpiece due to oxidation reaction during the heating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a cross-sectional view of the overall structure of the present invention;

[0026] Figure 3 is an enlarged view of the structure of the transposition device of the present invention;

[0027] Figure 4 is an enlarged cross-sectional view of the transposition device of the present invention;

[0028] Figure 5 is an enlarged view of the structure of the holding device of the present invention;

[0029] Figure 6 is a schematic diagram of the lifting device of the present invention;

[0030] Figure 7 is an enlarged cross-sectional view of the lifting plate of the present invention.

[0031] In the figure: 1, base; 2, transposition device; 201, through groove; 202, sliding plate; 203, loading table; 204, positioning hole; 205, top ring; 206, magnet one; 207, magnet two; 3, holding device; 301, installation table; 302, positioning column; 303, side ring; 304, holding table; 305, isolation cover; 4, lifting device; 401, threaded column; 402, lifting plate; 403, sliding sleeve; 404, threaded sleeve; 405, driven sprocket; 406, drive chain; 407, drive motor; 408, driving sprocket; 409, through hole; 410, chute; 411, clamping block; 412, spring; 5, operating table; 6, support plate; 7, furnace body; 8, step platform; 9, guardrail. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1

[0034] Please refer to Figure 1-7 As shown, a technical solution provided by the present invention is as follows:

[0035] A lifting type heating furnace for heat treatment of laminated workpieces, including a base 1, a transposition device 2 is arranged on the base 1, which is used to switch the loading containers, so that the heating and loading operations can be carried out synchronously, improving the heating efficiency. Two sets of containing devices 3 are both arranged on the transposition device 2 and cooperate with the transposition device 2 to contain the workpieces to be heated and provide protection for the workpieces during the heating process. A lifting device 4 is arranged on the base 1 to lift the containing device 3 and send the containing device 3 together with the workpieces into the heating furnace. The furnace body 7 is arranged above the lifting device 4.

[0036] Furthermore, an operating platform 5 is arranged at the top of the lifting device 4. Two sets of support plates 6 are fixedly connected to the bottoms on both sides of the operating platform 5. The bottoms of the two sets of support plates 6 are fixedly connected to the top surface of the base 1. The furnace body 7 is fixedly installed on the top surface of the operating platform 5. A ladder platform 8 is fixedly installed on the top surface of the support plate 6. A guardrail 9 is fixedly installed around the top surface of the operating platform 5.

[0037] Even further, the transposition device 2 includes a through groove 201, a sliding plate 202, a loading platform 203, positioning holes 204, top rings 205, magnetic block one 206, and magnetic block two 207. The through groove 201 is opened on the top surface of the base 1. The sliding plate 202 is clamped and slidably connected in the through groove 201. Two sets of loading platforms 203 are respectively fixedly connected to both sides of the top surface of the sliding plate 202. The positioning holes 204 are evenly opened on the top surface of the loading platform 203. Two sets of top rings 205 are respectively threadedly connected to the outer walls of the two sets of loading platforms 203. The outer diameter of the top ring 205 is equal to the aperture of the through hole 409. Such a setting ensures that after the heating is completed, when the containing device 3 descends and the block 411 squeezes the top ring 205, the reaction force of the top ring 205 on the block 411 can completely squeeze the block 411 into the chute 410, so as to ensure that the containing device 3 can smoothly fall on the loading platform 203. The top surface of the top ring 205 is set as a smooth convex surface. By setting the smooth convex surface, the wear between the top ring 205 and the block 411 is reduced, and the service life is increased. Two sets of magnetic block one 206 are respectively embedded on both sides inside the sliding plate 202, and the two sets of magnetic block one 206 are respectively coaxially arranged with the two sets of loading platforms 203. The magnetic block two 207 is embedded at the center of the bottom surface of the base 1.

[0038] In addition, the storage device 3 includes a mounting table 301, positioning posts 302, a side ring 303, a storage table 304, and an isolation cover 305. The mounting table 301 is placed on the top of the loading table 203. The positioning posts 302 are fixedly connected to the bottom surface of the mounting table 301, and the positioning posts 302 are arranged in one-to-one correspondence with the positioning holes 204. The length of the positioning posts 302 is equal to the depth of the positioning holes 204, and the length of the positioning posts 302 is greater than the height of the top ring 205. This setting ensures that during the descent of the storage device 3, the positioning posts 302 first insert into the positioning holes 204 to position the storage device 3, and then the top ring 205 is used to press the latch 411 into the sliding groove 410 to ensure that the storage device 3 does not shake randomly during the contraction of the latch 411 and finally falls steadily on the loading table 203. The side ring 303 is fixedly sleeved on the circumferential surface of the mounting table 301. The storage table 304 is fixedly installed on the top surface of the mounting table 301. The isolation cover 305 is detachably connected to the top surface of the storage table 304, and the isolation cover 305 completely covers the top surface of the storage table 304.

[0039] In addition, the lifting device 4 includes a threaded column 401, a lifting plate 402, a threaded sleeve 404, a driven sprocket 405, a transmission chain 406, a driving motor 407, and a driving sprocket 408. The threaded column 401 is rotatably connected to the top surface of the base 1 through a bearing. The lifting plate 402 is slidably connected to the threaded column 401. The lifting device 4 further includes a sliding sleeve 403. The sliding sleeve 403 is fixedly connected to the sliding hole of the lifting plate 402 penetrated by the threaded column 401. The inner wall of the sliding sleeve 403 abuts against the outer wall of the threaded column 401, and the inner wall of the sliding sleeve 403 is smooth. By providing the smooth sliding sleeve 403, while ensuring that the lifting plate 402 can be lifted and lowered smoothly, the wear of the threaded column 401 and the lifting plate 402 is reduced. The threaded sleeve 404 is rotatably connected to the bottom surface of the lifting plate 402, and the threaded sleeve 404 is threadedly connected to the threaded column 401. The driven sprocket 405 is fixedly sleeved on the circumferential surface of the threaded sleeve 404. The transmission chain 406 is sleeved on the driven sprocket 405. The number of threaded columns 401 is four groups. The four groups of threaded columns 401 are respectively arranged at the four corners of the lifting plate 402. Each group of threaded columns 401 is threadedly connected with a group of threaded sleeves 404. Each group of threaded sleeves 404 is sleeved with a group of driven sprockets 405. The transmission chain 406 meshes with the four groups of driven sprockets 405. By providing four groups of threaded columns 401, the four groups of threaded sleeves 404 are used to drive the lifting plate 402 to lift and lower simultaneously, so that the lifting plate 402 is more evenly stressed and the stability of the lifting plate 402 during movement is improved. The driving motor 407 is fixedly installed on the bottom surface of the lifting plate 402. The driving sprocket 408 is fixedly connected to the output end of the driving motor 407 through a rotating shaft and a coupling. The driving sprocket 408 meshes with the transmission chain 406, and the driving sprocket 408 tightens the transmission chain 406.

[0040] It should be noted that the lifting device 4 further includes a through hole 409, a chute 410, a clamping block 411, and a spring 412. The through hole 409 is opened at the center of the lifting plate 402. The chute 410 is opened on the circumferential surface of the through hole 409. The clamping block 411 is slidably connected in the chute 410. One end of the spring 412 is fixedly connected to the clamping block 411, and the other end of the spring 412 is fixedly connected to the chute 410. When the spring 412 is in its natural state, the bottom surface of the section of the clamping block 411 extending out of the chute 410 is set as a smooth inclined surface. By setting the bottom surface of the clamping block 411 as a smooth inclined surface, when the clamping block 411 descends and presses against the side ring 303 or the top ring 205, there is a component force in the horizontal direction for the reaction force received by the inclined surface. Thus, this component force is used to press the clamping block 411 into the chute 410, realizing the automatic squeezing and contraction of the clamping block 411 without manual operation, reducing the risk of being burned.

[0041] The electrical components and devices appearing in this embodiment are all existing devices known in the art. The content protected by the present invention does not involve the improvement of the internal structures of these devices. The electrical components and devices appearing in this embodiment are all electrically connected to the external main controller and the 220V mains power supply, and the main controller can be a conventional known device such as a computer for control.

[0042] In summary, when the up-lifting type heating furnace for heat treatment of laminated workpieces is in use, the isolation cover 305 on the outermost placing device 3 is removed, and the workpieces to be heated are placed on the placing table 304 as required (special workpieces can be fixed with specific fixing parts to ensure good and uniform heat reception of the workpieces). After the placement is completed, the isolation cover 305 is tightly covered on the placing table 304 to completely cover all the workpieces.

[0043] Push the sliding plate 202 to make the sliding plate 202 slide in the through groove 201 until the placing device 3 loaded with workpieces moves to directly below the furnace body 7. At this time, the first magnet 206 and the second magnet 207 attract each other to keep the sliding plate 202 fixed.

[0044] Start the drive motor 407, which drives the active sprocket 408 to rotate through the rotating shaft. The active sprocket 408 rotates and drives the transmission chain 406 to start moving, thereby driving the four sets of driven sprockets 405 to rotate synchronously, so that the four sets of threaded sleeves 404 rotate and slide synchronously along the four sets of threaded columns 401, thereby driving the lifting plate 402 to descend smoothly. During the slow descent of the lifting plate 402, when the block 411 contacts the edge ring 303, the lifting plate 402 continues to descend. At this time, the reaction force of the edge ring 303 on the inclined surface of the block 411 squeezes the block 411 to slide and shrink in the slide groove 410, so that the block 411 passes through the edge ring 303. When the block 411 moves to the lower side of the edge ring 303 and loses contact with the edge ring 303, the block 411 is no longer squeezed by the edge ring 303, and the elastic force generated by the deformation of the spring 412 pushes the block 411 to reset. After the block 411 is reset, the driving motor 407 is controlled to reverse, and the driving motor 407 reverses through the transmission chain 406 to drive the driven sprocket 405 and the threaded sleeve 404 to reverse, thereby driving the lifting plate 402 to slowly rise. During the lifting plate 402 rising process, the block 411 contacts the edge ring 303, lifts the edge ring 303 upward, and thus lifts the holding device 3 upward as a whole, until the holding table 304 is sent into the furnace body 7, and the driving motor 407 is turned off to keep the lifting device 4 fixed. The workpiece in the holding device 3 can be heated by the furnace body 7. During the heating process, it can be moved to the operating table 5 through the ladder platform 8 to add fuel to the furnace body 7.

[0045] When the furnace body 7 heats the containing device 3, the top ring 205 is screwed to lift the top ring 205. When the furnace body 7 heats the containing device 3, workpieces are loaded into another group of containing devices 3 to prepare for heating the next batch of workpieces, thereby saving processing time.

[0046] After the first batch of workpieces are heated, the drive motor 407 is started to rotate to make the lifting plate 402 descend, driving the holding device 3 to descend. During the descending process of the lifting plate 402, the positioning column 302 descends and is inserted into the positioning hole 204 for positioning. The lifting plate 402 continues to descend until the block 411 contacts the top ring 205. The block 411 is squeezed by the top ring 205 and retracts into the slide groove 410. When the block 411 is completely retracted into the slide groove 410, the holding device 3 falls smoothly on the loading platform 203 as a whole. At this time, the drive motor 407 is controlled to reverse and drive the lifting plate 402 to rise until it is completely out of contact with the holding device 3. The drive motor 407 is turned off to push the slide plate 202, so that the holding device 3 loaded with new workpieces moves to the bottom of the furnace body 7, and the first heating step is repeated. The drive motor 407 is used to make the lifting plate 402 lift the new holding device 3 into the furnace body 7 for heating the next batch of workpieces.

[0047] After the next batch of workpieces starts to be heated, the heated holding device 3 is clamped by the clamping device. Specifically, the side ring 303 can be used as the force application point for clamping. After the holding device 3 is removed from the loading table 203, the isolation cover 305 is removed, the heated workpieces are taken out and conveyed to the next process, and a new batch of workpieces to be heated are placed in the holding device 3 and wait for the next heating. By continuously repeating the above steps, continuous heating of the workpieces can be achieved, improving the heating efficiency and reducing energy consumption.

[0048] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A lifting type heating furnace for heat treatment of laminated workpieces, characterized in that, It includes: Base (1); Position-switching device (2), arranged on the base (1), used for switching the loading utensils so that the heating and loading operations can be carried out synchronously, improving the heating efficiency; Containing device (3), arranged on the position-switching device (2), used in cooperation with the position-switching device (2) to hold the workpiece to be heated and provide protection for the workpiece during the heating process; Lifting device (4), arranged on the base (1), used to lift the containing device (3) and send the containing device (3) together with the workpiece into the heating furnace; Furnace body (7), arranged above the lifting device (4).

2. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 1, characterized in that: The top of the lifting device (4) is connected with an operating platform (5), the bottom of the operating platform (5) is connected with a support plate (6), the support plate (6) is connected with the base (1), the furnace body (7) is connected to the operating platform (5), a step platform (8) is connected to the support plate (6), and a guardrail (9) is connected to the operating platform (5).

3. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 1, characterized in that: The position-switching device (2) includes a through groove (201), a sliding plate (202), a loading table (203), a positioning hole (204), a top ring (205), a first magnet (206), and a second magnet (207). The through groove (201) is opened on the base (1), the sliding plate (202) is clamped and slidably connected in the through groove (201), the loading table (203) is connected to the sliding plate (202), the positioning hole (204) is opened on the loading table (203), the top ring (205) is threadedly connected to the loading table (203), the first magnet (206) is embedded in the sliding plate (202), and the first magnet (206) is coaxially arranged with the loading table (203), and the second magnet (207) is embedded in the base (1).

4. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 3, wherein: The containing device (3) includes a mounting table (301), a positioning column (302), a side ring (303), a containing table (304), and an isolation cover (305). The mounting table (301) is placed on the loading table (203), the positioning column (302) is connected to the mounting table (301), and the positioning column (302) is arranged in one-to-one correspondence with the positioning hole (204). The side ring (303) is connected to the mounting table (301), the containing table (304) is connected to the mounting table (301), the isolation cover (305) is detachably connected to the containing table (304), and the isolation cover (305) completely covers the top surface of the containing table (304).

5. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 1, characterized in that: The lifting device (4) includes a threaded column (401), a lifting plate (402), a threaded sleeve (404), a driven sprocket (405), a transmission chain (406), a drive motor (407), and a driving sprocket (408). The threaded column (401) is rotatably connected to the base (1), the lifting plate (402) is slidably connected to the threaded column (401), the threaded sleeve (404) is rotatably connected to the lifting plate (402), and the threaded sleeve (404) is threadedly connected to the threaded column (401). The driven sprocket (405) is fixedly sleeved on the threaded sleeve (404), the transmission chain (406) is sleeved on the driven sprocket (405), the drive motor (407) is connected to the lifting plate (402), the driving sprocket (408) is connected to the drive motor (407), the driving sprocket (408) meshes with the transmission chain (406), and the driving sprocket (408) tightens the transmission chain (406). The lifting device (4) further includes a through hole (409), a chute (410), a clamping block (411), and a spring (412). The through hole (409) is opened on the lifting plate (402), the chute (410) is opened in the through hole (409), the clamping block (411) is slidably connected in the chute (410), one end of the spring (412) is connected to the clamping block (411), and the other end of the spring (412) is connected to the chute (410).

6. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 3, wherein: The outer diameter of the top ring (205) is equal to the aperture of the through hole (409), and the top surface of the top ring (205) is set as a smooth convex surface.

7. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 4, characterized in that: The length of the positioning column (302) is equal to the depth of the positioning hole (204), and the length of the positioning column (302) is greater than the height of the top ring (205).

8. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 5, characterized in that: The lifting device (4) further includes a sliding sleeve (403). The sliding sleeve (403) is connected to the sliding hole of the lifting plate (402) penetrated by the threaded column (401). The inner wall of the sliding sleeve (403) abuts against the outer wall of the threaded column (401), and the inner wall of the sliding sleeve (403) is set to be smooth.

9. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 5, characterized in that: The number of the threaded columns (401) is four groups. The four groups of threaded columns (401) are respectively arranged at the four corners of the lifting plate (402). Each group of threaded columns (401) is threadedly connected with a group of threaded sleeves (404). Each group of threaded sleeves (404) is sleeved with a group of driven sprockets (405), and the transmission chain (406) meshes with the four groups of driven sprockets (405).

10. The lifting type heating furnace for heat treatment of laminated workpieces according to claim 5, characterized in that: When the spring (412) is in a natural state, the bottom surface of the section of the clamping block (411) extending out of the chute (410) is set as a smooth inclined surface.

Images