External high-temperature lifting appliance device of trolley heat treatment furnace
By using the high-temperature lifting device outside the trolley heat treatment furnace and the combination design of the moving frame and support rod, multi-layer loading of steel pipes is realized, which solves the problem of low space utilization in the existing technology and improves production efficiency.
Patent Information
- Application Number
- CN202520669187.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-04-10
AI Technical Summary
The existing loading method of the bogie heat treatment furnace cannot make full use of the furnace space. The hook lifting device can only support the placement of steel pipes in a single layer, resulting in low space utilization.
The furnace adopts a high-temperature lifting device outside the trolley heat treatment furnace, which includes a moving frame and support rods. The moving components drive the support rods to move closer or further apart, embedding them into the steel pipes to clamp them, thus achieving multi-layer loading.
It improves the space utilization rate inside the heat treatment furnace, facilitates multi-layer loading and handling of steel pipes, and enhances production efficiency and equipment utilization.
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Figure CN223879287U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of trolley heat treatment furnace, in particular to a trolley heat treatment furnace high-temperature hoist device outside the furnace. BACKGROUND
[0002] The trolley heat treatment furnace is widely used in the heat treatment process of metal materials, and its main function is to heat, hold and cool the metal workpieces such as steel pipes to improve the mechanical properties of the materials. In industrial production, the efficient operation of the trolley heat treatment furnace is of great significance to improve production efficiency and reduce energy consumption. With the increasing requirements of the manufacturing industry on the heat treatment process, how to optimize the loading method to improve the production capacity of the heat treatment furnace has become the focus of the industry.
[0003] At present, in order to solve the loading problem of the trolley heat treatment furnace, the industry generally uses a row of hook-shaped hangers as the main tool. The row of hook-shaped hangers realizes the furnace discharge operation by hooking a single steel pipe from below.
[0004] For the above related technology, the row of hook-shaped hangers and similar loading methods only support single-layer placement of steel pipes, and cannot fully utilize the internal space of the heat treatment furnace. CONTENT OF THE UTILITY MODEL
[0005] In order to improve the space utilization rate in the heat treatment furnace, the present application provides a trolley heat treatment furnace high-temperature hoist device outside the furnace.
[0006] The trolley heat treatment furnace high-temperature hoist device outside the furnace provided by the present application adopts the following technical solution:
[0007] A trolley heat treatment furnace high-temperature hoist device outside the furnace, comprising a moving frame and a support rod, the support rod is provided with two, the length direction of the support rod is consistent with the length direction of the moving frame, the two support rods are respectively arranged at both ends of the moving frame along the length direction of the moving frame, the periphery of the support rod is used to contact the inner wall of the steel pipe, the moving frame is connected with a moving assembly, and the moving assembly is used to drive the two support rods to move along the length direction of the moving frame and drive the two support rods to move closer to or away from each other.
[0008] By adopting the above technical solution, when in use, the crown block hoists the moving frame and drives the moving frame to move above the steel pipe, the moving assembly drives the threaded rod to rotate, so that the two support rods move away from each other, so as to facilitate the downward movement of the two support rods to both ends of the steel pipe. When the support rods approach the steel pipe, the moving assembly drives the support rods to move along the length direction of the moving frame, so that the support rods move closer to each other and embed into the steel pipe, and the periphery of the support rod contacts the inner wall of the steel pipe. When the support rods are embedded into the steel pipe, the crown block drives the moving frame to move, so that the support rods drive the steel pipe to move, facilitating the transportation of the steel pipe, and the support rods are embedded into both ends of the steel pipe to clamp the steel pipe, so as to facilitate the multi-layer loading of the steel pipe in the heat treatment furnace, and improve the space utilization rate in the heat treatment furnace.
[0009] Optionally, the moving frame is provided with a sliding groove, the length direction of the sliding groove is consistent with the length direction of the moving frame, the moving assembly comprises a threaded rod, a sliding block and a rotating piece, the length direction of the threaded rod is consistent with the length direction of the moving frame, the threaded rod is rotationally connected in the sliding groove, the threaded rod comprises a right thread segment and a reverse thread segment, two sliding blocks are provided, one sliding block is threadedly sleeved on the right thread segment, and the other sliding block is threadedly sleeved on the reverse thread segment, the rotating piece is used for driving the threaded rod to rotate, and the support rod is in one-to-one correspondence with the sliding block, and the support rod is connected to the sliding block.
[0010] By adopting the above technical scheme, the rotating piece drives the threaded rod to rotate, so as to drive the two sliding blocks to slide in the length direction of the moving frame and be connected in the sliding groove, and then the two sliding blocks are driven to approach or move away from each other, so that the two support rods can clamp or send away the steel pipe.
[0011] Optionally, the rotating piece comprises a first sprocket, a second sprocket, a chain and a first motor, the first sprocket is sleeved on the threaded rod, the central axis of the first sprocket is collinear with the central axis of the threaded rod, the first motor is connected to the moving frame, the second sprocket is connected to the output shaft of the first motor, one end of the chain is sleeved on the second sprocket, and the other end of the chain is sleeved on the first sprocket.
[0012] By adopting the above technical scheme, the first motor drives the second sprocket to rotate, the second sprocket drives the chain to transmit, the chain drives the first sprocket to rotate, and the threaded rod rotates with the first sprocket, so as to conveniently drive the two sliding blocks to move.
[0013] Optionally, the sliding block is provided with a mounting opening, one end of the support rod is embedded in the mounting opening along the length direction of the support rod, the support rod is slidably connected in the mounting opening along the length direction of the support rod, and the support rod is connected with a locking assembly.
[0014] By adopting the above technical scheme, the inner diameters of different types of steel pipes are different, when different types of steel pipes need to be carried, the support rod needs to be replaced, and the support rod is detachably connected in the mounting opening through the locking block, so as to replace the support rods with different diameters, and then to adapt to different types of steel pipes.
[0015] Optionally, the support rod is provided with a mounting groove on the side, the length direction of the mounting groove is consistent with the radial direction of the support rod, the locking assembly comprises a locking block and a first spring, the length direction of the first spring is consistent with the length direction of the mounting groove, one end of the first spring is connected to the inner wall of the mounting groove along the length direction of the first spring, the other end of the first spring is connected to the locking block, the locking block is slidably connected in the mounting groove along the length direction of the mounting groove, and the inner wall of the mounting opening is provided with a locking groove for embedding the locking block.
[0016] By adopting the technical scheme, when the support rod is installed, one end of the support rod is embedded into the installation opening, the locking block is embedded into the installation slot under the extrusion of the inner wall of the installation opening, and the locking block extrudes the first spring, so that the first spring is deformed; when the locking block approaches the locking slot, the first spring restores its shape and pushes the locking block to be embedded into the locking slot, so that the support rod is stably connected in the installation opening.
[0017] Optionally, a connecting hole is formed in the inner wall of one end of the installation slot along the length direction of the support rod, the length direction of the connecting hole is consistent with the length direction of the installation slot, the locking block is connected with a moving block, the length direction of the moving block is consistent with the length direction of the support rod, the moving block passes through the connecting hole along the length direction thereof, and the moving block is slidingly connected in the connecting hole along the length direction of the connecting hole.
[0018] By adopting the technical scheme, when the support rod is disassembled, the moving block is moved along the length direction of the connecting hole, the locking block moves along the length direction of the connecting hole following the moving block, so that the locking block is away from the locking slot and extrudes the first spring, thereby facilitating the support rod to be taken out of the installation opening, and facilitating the replacement of the support rod.
[0019] Optionally, the slider is connected with an opening and closing plate at one end away from the other slider, the opening and closing plate is used for opening or closing the installation opening, the slider is connected with a first magnetic block at one end close to the opening and closing plate, the opening and closing plate is connected with a second magnetic block, and the first magnetic block and the second magnetic block are attracted to each other when the opening and closing plate approaches the slider.
[0020] By adopting the technical scheme, when in use, the opening and closing plate is connected to the slider, so as to avoid the situation that the support rod is separated from the installation opening due to accidental touch as much as possible, and the opening and closing plate and the slider are detachably connected through the first magnetic block and the second magnetic block, so as to facilitate the disassembly of the opening and closing plate.
[0021] Optionally, the slider is connected with a positioning block at one end close to the opening and closing plate, and the opening and closing plate is provided with a positioning slot at one end close to the slider, and the positioning block is embedded in the positioning slot when the opening and closing plate is connected to the slider.
[0022] By adopting the technical scheme, when the opening and closing plate is installed, one end of the positioning block is embedded into the positioning slot, so as to position the opening and closing plate, facilitate the first magnetic block and the second magnetic block to approach each other, and support the opening and closing plate through the positioning block, so that the opening and closing plate is stably connected to the slider.
[0023] In summary, the present application has at least one of the following beneficial technical effects:
[0024] 1. The moving assembly drives the support rods to move along the length direction of the moving frame, so that the support rods are close to each other and embedded in the steel pipe, and the circumferential side of the support rod is in contact with the inner wall of the steel pipe; after the support rods are embedded in the steel pipe, the moving frame is moved by the crown block, so that the support rods drive the steel pipe to move, facilitating the transportation of the steel pipe, and the steel pipe is clamped by the support rods embedded in both ends of the steel pipe, so as to facilitate the multi-layer loading of the steel pipe in the heat treatment furnace and improve the space utilization rate of the heat treatment furnace;
[0025] 2. The first motor drives the second sprocket to rotate, the second sprocket drives the chain to transmit, the chain drives the first sprocket to rotate, and the threaded rod rotates with the first sprocket, so as to facilitate the movement of the two sliders;
[0026] 3. The inner diameters of different models of steel pipes are different, and when different models of steel pipes need to be transported, the support rods need to be replaced, and the support rods are detachably connected in the mounting port through the locking block, so as to facilitate the replacement of support rods of different diameters, and further facilitate the adaptation to different models of steel pipes. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 is a perspective view of the embodiment.
[0028] Figure 2 is a top view of the embodiment.
[0029] Figure 3 is a sectional view of the embodiment Figure 2 in A-A direction.
[0030] Figure 4 is an enlarged view of part B of the embodiment Figure 3
[0031] BRIEF DESCRIPTION OF DRAWINGS: 100, moving frame; 110, sliding groove; 120, fixed plate; 130, communication port; 140, connecting ring; 200, support rod; 210, fixed rod; 211, mounting groove; 212, connecting hole; 220, connecting rod; 221, guide block; 300, moving assembly; 310, threaded rod; 311, right threaded section; 312, reverse threaded section; 320, slider; 321, mounting port; 322, locking groove; 330, rotating part; 331, first sprocket; 332, second sprocket; 333, chain; 334, first motor; 340, positioning block; 341, first magnetic block; 400, opening and closing plate; 410, positioning groove; 411, second magnetic block; 500, locking assembly; 510, locking block; 511, moving block; 520, first spring. DETAILED DESCRIPTION
[0032] The application will be further described in detail below in combination with the Figures 1-4
[0033] The embodiment of the application discloses a high-temperature lifting device outside a trolley heat treatment furnace. Figure 1 and Figure 2 The high-temperature lifting device outside the trolley heat treatment furnace comprises a moving frame 100, and two support rods 200, the moving frame 100 is horizontally arranged, the two support rods 200 are arranged at two ends of the moving frame 100 along the length direction of the moving frame 100, and the length direction of the support rod 200 is consistent with the length direction of the moving frame 100. The moving frame 100 is connected with a moving assembly 300, the moving assembly 300 is used for driving the two support rods 200 to move along the length direction of the moving frame 100 and driving the two support rods 200 to move close to each other or move away from each other. The periphery of the support rod 200 is used for being in contact with the inner wall of the steel pipe. The two support rods 200 are embedded into the two ends of the steel pipe to clamp and carry the steel pipe, so that the multi-layer loading in the heat treatment furnace is facilitated, and the utilization rate of the space in the heat treatment furnace is improved.
[0034] Referring to Figure 1 and Figure 3 The top of the moving frame 100 is connected with two connecting rings 140, the connecting rings 140 are used for being connected with a crown block, and the two connecting rings 140 are arranged at intervals along the length direction of the moving frame 100. The bottom of the moving frame 100 is provided with a sliding groove 110, the length direction of the sliding groove 110 is consistent with the length direction of the moving frame 100, the sliding groove 110 is provided with openings at two ends along the length direction of the sliding groove 110, and the sliding groove 110 is connected with two fixed plates 120 inside, the two fixed plates 120 are arranged at intervals along the length direction of the sliding groove 110, and the length direction of the fixed plate 120 is consistent with the vertical direction.
[0035] Referring to Figure 1 and Figure 3 The moving assembly 300 comprises a threaded rod 310, a sliding block 320 and a rotating piece 330, the length direction of the threaded rod 310 is consistent with the length direction of the moving frame 100, the threaded rod 310 passes through the fixed plate 120 along the length direction of the threaded rod 310, and the threaded rod 310 is rotationally connected to the fixed plate 120. The length direction of the sliding block 320 is consistent with the vertical direction, the sliding block 320 is provided with two, and the two sliding blocks 320 are arranged at intervals along the length direction of the moving frame 100. The threaded rod 310 comprises a right-threaded section 311 and a left-threaded section 312, one sliding block 320 is threadedly sleeved on the right-threaded section 311, and the other sliding block 320 is threadedly sleeved on the left-threaded section 312. The support rod 200 corresponds to the sliding block 320 in one-to-one mode, and the support rod 200 is connected to one end of the sliding block 320 close to the other sliding block 320.
[0036] Referring to Figure 3, the rotating member 330 comprises a first sprocket 331, a second sprocket 332, a chain 333, a first motor 334, the first motor 334 is connected to the top of the moving frame 100, the top of the sliding groove 110 is provided with a communication port 130, the second sprocket 332 is connected to the output shaft of the first motor 334, and the central axis of the second sprocket 332 is collinear with the central axis of the output shaft of the first motor 334. The first sprocket 331 is sleeved on the middle part of the threaded rod 310, and the first sprocket 331 is arranged between the two fixed plates 120, and the central axis of the first sprocket 331 is collinear with the central axis of the threaded rod 310. One end of the chain 333 is sleeved on the second sprocket 332, and the other end of the chain 333 passes through the communication port 130 and is sleeved on the first sprocket 331. The first motor 334 drives the second sprocket 332 to rotate, so as to drive the first sprocket 331 to rotate, so that the threaded rod 310 rotates, and then drives the two sliding blocks 320 to move close to or away from each other, the sliding block 320 drives the support rod 200 to move, and then controls the support rod 200 to clamp or release the steel pipe.
[0037] With reference to Figure 3 and Figure 4 , the sliding block 320 is provided with a mounting port 321 at the bottom end, and the depth direction of the mounting port 321 is consistent with the length direction of the moving frame 100. The support rod 200 comprises a fixed rod 210 and a connecting rod 220, the length direction of the connecting rod 220 is consistent with the length direction of the moving frame 100, the length direction of the fixed rod 210 is consistent with the length direction of the connecting rod 220, the fixed rod 210 is connected to one end of the connecting rod 220, and the central axis of the connecting rod 220 is collinear with the central axis of the fixed rod 210.
[0038] With reference to Figure 1 and Figure 3 , the connecting rod 220 is connected with a guide block 221 along the length direction and away from one end of the fixed rod 210, the length direction of the guide block 221 is consistent with the length direction of the connecting rod 220, and the guide block 221 is in the shape of a circular truncated cone. The fixed rod 210 is embedded in the mounting port 321 away from one end of the connecting rod 220, and the fixed rod 210 is slidingly connected to the mounting port 321 along the length direction.
[0039] With reference to Figure 3 and Figure 4The sliding block 320 is connected with the opening and closing plate 400 at one end away from the guide block 221 along the length direction of the moving frame 100, and the opening and closing plate 400 is arranged at one end of the mounting port 321. The sliding block 320 is connected with two positioning blocks 340 at one end away from the guide block 221 along the length direction of the moving frame 100. The opening and closing plate 400 is provided with two positioning grooves 410 at one end close to the sliding block 320, and the depth direction of the positioning groove 410 is consistent with the length direction of the fixed rod 210. The positioning groove 410 corresponds to the positioning block 340 one by one, and when the opening and closing plate 400 is connected to the sliding block 320, the positioning block 340 is embedded in the positioning groove 410. When the fixed rod 210 is embedded in the mounting port 321, the fixed rod 210 is spaced apart from the opening and closing plate 400 at one end away from the connecting rod 220. The positioning block 340 is embedded with a first magnetic block 341 at one end away from the sliding block 320, and the inner wall of the positioning groove 410 is embedded with a second magnetic block 411. When the positioning block 340 is embedded in the positioning groove 410, the first magnetic block 341 and the second magnetic block 411 attract each other.
[0040] Referring to Figure 3 and Figure 4 , the fixed rod 210 is connected with a locking assembly 500, and the locking assembly 500 is used for locking the fixed rod 210 in the mounting port 321. The fixed rod 210 is provided with a mounting groove 211 on the side, and the mounting groove 211 is provided with two, and the two mounting grooves 211 are distributed along the circumference of the fixed rod 210, and the length direction of the mounting groove 211 is consistent with the radial direction of the supporting rod 200.
[0041] Referring to Figure 3 and Figure 4 , the locking assembly 500 is connected with a locking block 510 and a first spring 520 in the mounting groove 211, the length direction of the first spring 520 is consistent with the length direction of the mounting groove 211, one end of the first spring 520 is connected to the inner wall of the mounting groove 211 along the length direction, and the other end of the first spring 520 is connected to the locking block 510. The locking block 510 is slidingly connected in the mounting groove 211 along the length direction of the mounting groove 211, and the inner wall of the mounting port 321 is provided with two locking grooves 322, and the locking groove 322 corresponds to the locking block 510 one by one, and the locking block 510 is embedded in the locking groove 322. The locking block 510 is provided with a guide surface at one end close to the connecting rod 220 along the length direction of the fixed rod 210, the guide surface is inclinedly arranged, and the guide surface is arranged at one end of the locking block 510 away from the first spring 520.
[0042] Referring to Figure 3 and Figure 4The mounting groove 211 is provided with a connecting hole 212 along the length direction of the fixing rod 210 and away from the inner wall of one end of the connecting rod 220, and the length direction of the connecting hole 212 is consistent with the length direction of the mounting groove 211. The locking block 510 is connected with a moving block 511, the length direction of the moving block 511 is consistent with the length direction of the supporting rod 200, the moving block 511 passes through the connecting hole 212 along the length direction thereof, and the moving block 511 is slidingly connected in the connecting hole 212 along the length direction of the connecting hole 212. The moving block 511 is arranged between the opening and closing plate 400 and the fixing rod 210. When the supporting rod 200 is disassembled, the moving block 511 is moved along the length direction of the connecting hole 212, so as to drive the locking block 510 to move along the length direction of the mounting groove 211, so that the locking block 510 is away from the locking groove 322, the fixing rod 210 is away from the mounting port 321, and the supporting rod 200 is convenient to replace.
[0043] The implementation principle of the high-temperature lifting device outside the trolley heat treatment furnace of the embodiment of the application is as follows: in use, the movable frame 100 is moved to above the steel pipe by the crown block, and the first motor 334 drives the second sprocket 332 to rotate, the second sprocket 332 drives the chain 333 to transmit, so as to drive the first sprocket 331 and the threaded rod 310 to rotate, and then drive the two sliding blocks 320 to move along the length direction of the movable frame 100 and away from each other, and the supporting rod 200 moves with the sliding block 320, so that the movable frame 100 is moved downward and close to the steel pipe by the crown block. When the two supporting rods 200 are arranged on the two sides of the steel pipe along the length direction of the steel pipe, the rotating member 330 drives the threaded rod 310 to rotate, so as to drive the two supporting rods 200 to move along the length direction of the movable frame 100 and make the two supporting rods 200 close to each other, and then drive the supporting rod 200 to be embedded in the steel pipe, so that the two supporting rods 200 clamp the steel pipe, so that the steel pipe moves with the supporting rod 200, the steel pipe is clamped by the supporting rod 200 embedded in the two ends of the steel pipe, and the space utilization rate of the heat treatment furnace is improved.
[0044] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.
Claims
1. A high temperature external lifting device for a trolley heat treatment furnace, characterized in that: The utility model provides a steel pipe moving device, including mobile frame (100), support rod (200), two support rods (200) are equipped with, the length direction of support rod (200) is identical with the length direction of mobile frame (100), two support rods (200) are respectively arranged in the both ends of mobile frame (100) along the length direction of mobile frame (100), the side of support rod (200) is used to contact with the inner wall of steel pipe, mobile frame (100) is connected with moving assembly (300), moving assembly (300) is used to drive two support rods (200) to move along the length direction of mobile frame (100) and drives two support rods (200) to approach each other or away from each other.
2. The high-temperature hanger device outside a car bottom heat treatment furnace according to claim 1, characterized in that: The utility model discloses a steel pipe moving device, including mobile frame (100), support rod (200), two support rods (200) are equipped with, the length direction of support rod (200) is identical with the length direction of mobile frame (100), two support rods (200) are respectively arranged in the both ends of mobile frame (100) along the length direction of mobile frame (100), the side of support rod (200) is used to contact with the inner wall of steel pipe, mobile frame (100) is connected with moving assembly (300), moving assembly (300) is used to drive two support rods (200) to move along the length direction of mobile frame (100) and drives two support rods (200) to approach each other or away from each other.
3. The high-temperature external lifting device of a trolley heat treatment furnace according to claim 2, characterized in that: The utility model discloses a steel pipe moving device, including mobile frame (100), support rod (200), two support rods (200) are equipped with, the length direction of support rod (200) is identical with the length direction of mobile frame (100), two support rods (200) are respectively arranged in the both ends of mobile frame (100) along the length direction of mobile frame (100), the side of support rod (200) is used to contact with the inner wall of steel pipe, mobile frame (100) is connected with moving assembly (300), moving assembly (300) is used to drive two support rods (200) to move along the length direction of mobile frame (100) and drives two support rods (200) to approach each other or away from each other.
4. The high temperature external lifting device for a car bottom heat treatment furnace of claim 2 wherein: The utility model discloses a steel pipe moving device, including mobile frame (100), support rod (200), two support rods (200) are equipped with, the length direction of support rod (200) is identical with the length direction of mobile frame (100), two support rods (200) are respectively arranged in the both ends of mobile frame (100) along the length direction of mobile frame (100), the side of support rod (200) is used to contact with the inner wall of steel pipe, mobile frame (100) is connected with moving assembly (300), moving assembly (300) is used to drive two support rods (200) to move along the length direction of mobile frame (100) and drives two support rods (200) to approach each other or away from each other.
5. The high temperature external lifting device for a car bottom heat treatment furnace as defined in claim 4 wherein: The support rod (200) is provided with a mounting groove (211) on the side, the length direction of the mounting groove (211) is consistent with the radial direction of the support rod (200), the locking assembly (500) comprises a locking block (510) and a first spring (520), the length direction of the first spring (520) is consistent with the length direction of the mounting groove (211), one end of the first spring (520) is connected to the inner wall of the mounting groove (211) along the length direction of the first spring (520), the other end of the first spring (520) is connected to the locking block (510), the locking block (510) is slidably connected to the mounting groove (211) along the length direction of the mounting groove (211), and the inner wall of the mounting port (321) is provided with a locking groove (322) for embedding the locking block (510).
6. The high temperature external lifting device for a car bottom heat treatment furnace of claim 5 wherein: The inner wall of one end of the mounting groove (211) along the length direction of the support rod (200) is provided with a connecting hole (212), the length direction of the connecting hole (212) is consistent with the length direction of the mounting groove (211), the locking block (510) is connected with a moving block (511), the length direction of the moving block (511) is consistent with the length direction of the support rod (200), the moving block (511) passes through the connecting hole (212) along the length direction of the moving block (511), and the moving block (511) is slidably connected to the connecting hole (212) along the length direction of the connecting hole (212).
7. The high temperature external lifting device for a car bottom heat treatment furnace of claim 6 wherein: The sliding block (320) is connected with an opening and closing plate (400) at the end away from the other sliding block (320), the opening and closing plate (400) is used for opening or closing the mounting port (321), the sliding block (320) is connected with a first magnetic block (341) at the end close to the opening and closing plate (400), the opening and closing plate (400) is connected with a second magnetic block (411), when the opening and closing plate (400) is close to the sliding block (320), the first magnetic block (341) and the second magnetic block (411) are attracted to each other.
8. The high temperature external lifting device for a car bottom heat treatment furnace of claim 7 wherein: The sliding block (320) is connected with a positioning block (340) at the end close to the opening and closing plate (400), the opening and closing plate (400) is provided with a positioning groove (410) at the end close to the sliding block (320), when the opening and closing plate (400) is connected to the sliding block (320), the positioning block (340) is embedded in the positioning groove (410).