Large heavy workpiece carrying and conveying system for automatic production line of heat treatment furnace

Abstract

The utility model relates to the technical field of heat treatment furnace conveying devices, in particular to a large heavy workpiece carrying and conveying system for an automatic production line of a heat treatment furnace, which comprises a supporting assembly and a track assembly positioned above the supporting assembly, the track assembly comprises at least two sets of roller way frames erected and located above the supporting assembly, the roller way frames are arranged in parallel, rolling wheels are rotationally connected to the roller way frames, each rolling wheel is independently provided with a supporting block, the supporting blocks are arranged in the conveying direction of roller ways, and each supporting block at least crosses two rolling wheels. An annular groove is formed in the periphery of the rolling wheel, a limiting rib protruding downwards is arranged at the bottom of the supporting block, the limiting rib is located in the annular groove, and the annular groove is used for guiding the limiting rib; and the width of the supporting block is smaller than that of the roller. The conveying system can be suitable for the high-temperature environment, stable conveying of the parts can be achieved, the heat loss of the heat treatment furnace can be reduced, and the energy consumption cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of a material conveying device for a heat treatment furnace, in particular to a large heavy workpiece carrying and conveying system for an automatic production line of a heat treatment furnace. Background Technique

[0002] A heat treatment furnace is an industrial device used for heat-treating metal materials. After the metal materials go through the processes of heating, heat preservation, and cooling in the furnace, the crystal phase structures on the surface and inside are improved, thereby being able to eliminate the residual stress inside the metal and enhance the mechanical properties of the metal materials.

[0003] In actual production, since the number of metal parts to be heat-treated in each batch is large and the weight is heavy, in order to facilitate the feeding of metal parts into the furnace, a sliding track is usually used to convey the products. The sliding conveying method is to set a block carrier on the track, and the metal parts are placed in the carrier. The carrier slides along the track to transport the metal parts to the corresponding heat treatment furnace. However, due to the large number and heavy weight of the metal parts themselves, when the block carrier slides on the track, not only is the frictional resistance large, the conveying efficiency is slow, but also the wear at the bottom of the block carrier is easily accelerated, resulting in a reduced service life of the carrier and an increased cost. Therefore, in order to reduce the frictional loss during sliding, a rolling conveyor roller path has emerged in the market. For example, in the prior art, "roller conveyor" (publication number: CN103449093A) and "a portable detachable conveying and transporting device" (publication number: CN115140492A). The above two rolling conveyor roller paths both adopt the method of setting two mutually parallel roller shaft frames and arranging rotatable roller shafts or rollers on the two roller shaft frames. When the roller shafts or rollers rotate, the objects above the roller shafts or rollers can be driven to move through friction. Although this roller path structure can achieve the transportation effect, when the roller path is used in the production line of a heat treatment furnace, the following technical problems will exist:

[0004] 1. The large energy consumption loss of the heat treatment furnace leads to increased costs. Although the rolling roller path has less frictional resistance than the sliding roller path, when the roller path is transporting, since the parts are placed on the pallet carrier and then the carrier is driven by the roller shaft or roller to move. If large-size and heavy-weight parts are transported, such as large-weight and large-size parts like automotive front axles, crankshafts, drive shafts, piston rods, and axle housings, the size of the pallet carrier has to be designed larger. And in actual production, there are a large number of components, and several heavy parts will be placed on each carrier pallet. To ensure the strength of the carrier, the pallet thickness will also be thicker. The roller path needs to carry the components into the heat treatment furnace and then take the parts out of the furnace after heat treatment. During the process of coming out of the furnace, the pallet will carry out a large amount of heat, and with a large size and thick thickness of the pallet, it absorbs more heat, resulting in a large amount of heat loss in the furnace. The heat loss will make it difficult to maintain the furnace temperature within the set temperature range, so more energy needs to be consumed to compensate for the lost heat, greatly increasing the cost.

[0005] 2. The carrier is prone to deformation, reducing the conveying efficiency. When carrying parts into the heat treatment furnace, it will also be affected by the high temperature in the furnace. Due to the large size of the pallet, it is prone to thermal deformation. When transporting large-weight and large-size parts, the pallet is more likely to be under the pressure of the part weight, which exacerbates the thermal deformation. This will not only reduce the service life of the pallet, but also the contact position between the deformed pallet and the roller or roller shaft is unstable, and the pallet moves smoothly, reducing the conveying efficiency.

[0006] 3. The roller path frame is prone to deformation, resulting in the inability to convey parts. In order to ensure that the conveying direction is a straight line during conveying and to ensure that the roller path frame does not jitter up and down due to the acting force when the parts are conveyed, the roller path frame of the prior art usually adopts an integrally formed mounting frame. In this way, the mounting frame is a whole, which can ensure that the parts can be accurately conveyed in a straight line direction and is not prone to the situation of the roller path frame jittering up and down when the parts are conveyed. However, when used in the heat treatment furnace production line, since the conveying roller path needs to extend into the furnace and will be affected by the high temperature in the furnace. If it is a whole mounting frame, it is more likely to be bent and deformed due to the high temperature. The deformation of the roller path will cause the pallet carrier to get stuck when moving to the deformed part, resulting in the inability to convey parts.

[0007] 4. The guide plate is prone to deformation, resulting in the inability to convey parts. In order to ensure that the pallet is conveyed in a straight line on the roller path, the conveying roller path of the prior art usually adds baffles on both sides of the roller path. The baffles can guide the pallet to prevent the pallet from deviating when moving. However, when used in the heat treatment furnace production line, the guide plate will also be affected by the high temperature in the furnace and deformed. And because the guide plate is relatively thin, this deformation amount will be larger. The deformed baffle cannot guide the pallet carrier and will also hinder the movement of the pallet, resulting in the inability to convey parts. Utility Model Content

[0008] The present utility model provides a large heavy workpiece carrying and conveying system for an automatic production line of a heat treatment furnace, which can solve the problems in the prior art that when a conveying roller path is used in a heat treatment furnace production line, it is easy to accelerate the heat loss of the heat treatment furnace, and each component of the conveying roller path is easily deformed under the influence of high temperature, resulting in the failure of the parts to be smoothly conveyed.

[0009] The present application provides the following technical solutions: A large heavy workpiece carrying and conveying system for an automatic production line of a heat treatment furnace, comprising a support assembly and a track assembly located above the support assembly; characterized in that:

[0010] The track assembly includes at least two groups of roller racks erected above the support assembly. The roller racks are arranged in parallel with each other. A row of rollers is rotatably arranged on the roller racks. Independent supporting blocks are arranged at intervals on the rollers. The supporting blocks are arranged along the conveying direction of the roller path, and each supporting block spans at least two rollers; an annular groove is formed on the outer periphery of the roller, and a limiting rib protruding downward is arranged at the bottom of the supporting block. The limiting rib is located in the annular groove, and the annular groove is used for guiding the limiting rib; the width of the supporting block is smaller than the width of the roller.

[0011] Beneficial effects:

[0012] 1. Reduce the heat loss of the heat treatment furnace and lower the cost. In the present utility model, the supporting blocks are arranged along the conveying direction of the roller path, and each supporting block spans at least two rollers, and the width is smaller than the width of the roller. Compared with the tray carriers used in the prior art, the surface area of the supporting blocks is greatly reduced, and the parts are erected between the supporting blocks on the two groups of roller racks. While being able to support the parts, it saves more materials. More importantly, due to the small surface area of the supporting blocks, less heat is absorbed in the heat treatment furnace, and the heat loss in the furnace can be reduced when coming out of the furnace, thereby effectively reducing the energy consumption cost of the heat treatment furnace.

[0013] 2. The carrier is evenly stressed and not easily deformed. Since the tray in the prior art is usually a whole piece, and the bottom of the tray is in point contact with the roller, when the tray bears parts, the middle part of the tray has no support, that is, it is very easy to be deformed by the pressure of the parts; but in the present solution, the supporting blocks are separately arranged on the rollers on each side of the conveying roller path, and two supporting blocks can form point supports for the parts. The point support method can reduce the weight of the parts to be evenly distributed on the two support points, and the point support method will make the whole supporting block on each side be stressed. When the supporting block is under pressure, the roller forms a support for the whole supporting block, so as to ensure that the supporting block is not easily deformed, which can not only extend the service life of the supporting block, but also ensure that the supporting block can drive the parts to be smoothly transmitted.

[0014] 3. The guiding structure has high fault tolerance and the part transportation is more stable. Since the conveying roller path in the prior art usually sets baffles on both sides to guide the pallet, and the baffles are relatively thin and are extremely easy to deform when impacted by the pallet. If it is used in the production line of the heat treatment furnace in the present utility model, the high temperature will further increase the deformation amount of the baffles, resulting in hindering the movement of the pallet. To solve this problem, the present utility model is provided with a downwardly protruding limiting rib at the bottom of the supporting block, and a circular groove is opened on the outer circumference of the roller. The limiting rib is located in the circular groove, and the circular groove can be used to guide the limiting rib. The advantage compared with the prior art is that the roller itself is small in size and has a cylindrical shape, and it is not easy to deform even under the high temperature in the heat treatment furnace. Moreover, each roller has a circular groove. Even if the circular groove on an individual roller is deformed due to the influence of high temperature, the circular grooves of the majority of the other rollers can still play a role in limiting the limiting rib, thereby improving the fault tolerance of the guiding structure and keeping the parts stable during transportation.

[0015] 4. In summary, on the basis of the conveying roller path in the prior art, the present utility model overcomes its disadvantages and designs a conveying roller path for the production line of the heat treatment furnace. While ensuring the basic functions of the conventional conveying roller path, it also solves the problem of the deformation of each component of the roller path caused by the high temperature of the heat treatment furnace, ensures the conveying stability of the roller path, and reduces the heat loss of the heat treatment furnace, effectively reducing the energy consumption cost.

[0016] Furthermore, each group of roller path frames includes two mutually parallel mounting plates and multiple rib bars fixed between the mounting plates. The mounting plates are of a segmented type connected end to end, and a connecting component is provided between each adjacent mounting plate for limiting the vertical direction of the mounting plate.

[0017] Beneficial effects: The roller path frame is not easy to deform and ensures the effective transportation of parts. The present utility model is designed with two groups of mutually parallel roller path frames, and each group of roller path frames includes two mutually parallel mounting plates. The mounting plates are set as segmented type. Compared with the prior art using an integrally formed whole mounting plate, the segmented mounting plates are shorter in length and are less affected by the high temperature in the heat treatment furnace. At the same time, multiple rib bars are located between the two mounting plates, and the rib bars can pull the mounting plates, making it not easy for the two mounting plates to bend and deform. Because if one of the mounting plates wants to deform, it needs to overcome the tensile stress of the rib bars and the other mounting plate, making this deformation very difficult, thereby being able to strengthen the connection strength between the two mounting plates and further reducing the deformation amount. In addition, by restricting the vertical position of the mounting plate through the connecting component, even the segmented mounting plates will not shake up and down due to the acting force of transporting parts during the transportation of parts, improving the stability of the mounting plate. In this way, it not only solves the problem that the high temperature in the heat treatment furnace will affect the deformation of the mounting plate, but also ensures the smoothness of the mounting plate and will not hinder the movement of the supporting block, so that the parts can be stably and smoothly transported on the roller path.

[0018] Furthermore, the support assembly includes a plurality of cross beams arranged at intervals on the ground and support blocks fixed above the cross beams. Grooves are formed above the support blocks, and bottom grooves are formed below the support blocks. The mounting plate is located within the grooves.

[0019] Beneficial effects: The grooves on the support blocks can ensure that the installation positions of multiple sections of mounting plates are in a straight line, which is conducive to the rapid installation of the mounting plates, improving the installation efficiency and accuracy; the bottom grooves below the support blocks not only reduce the material consumption of the support blocks and save costs, but also, since the heat treatment furnace is filled with high-temperature gas, the bottom grooves facilitate the circulation of the high-temperature gas, keeping the temperature stable everywhere in the furnace and enhancing the heat treatment effect.

[0020] Furthermore, there is a gap between the bottom of the limiting rib and the bottom of the annular groove.

[0021] Beneficial effects: Since the limiting ribs at the bottom of the supporting block are located within the roller annular grooves and rely on the side walls of the annular grooves to guide the limiting ribs, the bottom of the annular groove will not generate frictional resistance to the bottom of the limiting ribs, which can not only reduce the deformation of the limiting ribs, but also help the supporting block move smoothly on the rollers.

[0022] Furthermore, a plurality of protrusions are provided on both sides of each mounting plate. The positions and numbers of the protrusions correspond to those of the support blocks. The protrusions protrude towards both sides and the bottom of the mounting plate, and the bottom of the protrusions contacts the bottom of the grooves of the support blocks.

[0023] Beneficial effects: The protrusions protruding towards the bottom of the mounting plate enable the mounting plate to be supported on the grooves of the support blocks by means of the protrusions. By setting the numbers and positions of the protrusions to correspond to those of the support blocks, when designing and processing the mounting plate, only the dimensions of the protrusions need to be controlled, rather than precisely controlling the remaining dimensions of the entire bottom of the mounting plate, which makes it easier to ensure the processing accuracy of the protrusions, thereby ensuring the smoothness of the contact installation between the protrusions and the bottom of the grooves of the support blocks; and the protrusions protruding towards both sides of the mounting plate enable the two inner side walls of the grooves of the support blocks to form lateral limits on the protrusions, so as to facilitate the alignment of multiple mounting plates in a straight line when connected end to end, improving the conveying smoothness of the roller path.

[0024] Furthermore, the connection assembly includes a limiting groove fixed on the support block, a limiting post located within the limiting groove, and a limiting block pressed above the limiting post. One end of the limiting post is vertically fixed on the outer side surface of the mounting plate, and the other end of the limiting post extends into the limiting groove.

[0025] Beneficial effects: Since the connection assembly is arranged between each adjacent mounting plate, after the limiting post is pressed by the limiting block, the position of the mounting plate fixed to the limiting post is also fixed, thereby preventing the mounting plate from displacing in the up and down directions and improving the smoothness of the mounting plate.

[0026] Further, the cross-section of the crossbeam is in the shape of a capital "I", and the width of the upper plane of the crossbeam is smaller than that of the lower plane. A plurality of square holes are provided in the middle of the crossbeam.

[0027] Beneficial effects: The cross-section of the crossbeam in the shape of a capital "I" can enhance the support strength of the crossbeam in the vertical direction. The width of the upper plane of the crossbeam is smaller than that of the lower plane. On the one hand, it can save materials and reduce costs. On the other hand, it increases the contact area between the lower plane and the ground, improving the support stability. The plurality of square holes provided in the middle of the crossbeam can reduce the weight of the crossbeam and lower the material consumption.

[0028] Further, convex annular ribs are provided at both ends of the roller, and the annular ribs are located on the outer ring of the rotating shaft of the roller.

[0029] Beneficial effects: After the roller is installed between the two mounting plates, the end faces of the roller are likely to rub against the inner wall surfaces of the two mounting plates during rotation. The frictional force will hinder the rotation of the roller and thus affect the smoothness and stability of the part conveying. After the annular ribs are provided, only the annular ribs will rub against the inner wall surface of the mounting plate when the roller rotates, and the area of the annular ribs is smaller than that of the end faces of the roller. Therefore, the frictional resistance is reduced, which helps the parts to be stably conveyed on the roller path.

[0030] Further, a circle of ball bearings is evenly distributed on the outer side end surface of the annular rib, and the ball bearings can roll on the annular rib.

[0031] Beneficial effects: When the roller rotates, if the end faces of the roller come into contact with the inner wall surfaces of the two mounting plates, at this time, the ball bearings and the mounting plate are in rolling friction. Rolling friction can greatly reduce the frictional resistance, reduce the wear of the contact surface, reduce the vibration and noise during the rotation of the roller, make the rotation of the roller more stable, and is also beneficial to extending the service life of the roller and improving the smoothness of the roller rotation and the stability of the part conveying. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is the main structural view of the present utility model.

[0033] Figure 2 is Figure 1 the sectional view taken along A-A in

[0034] Figure 3 is Figure 2 the enlarged view of B in

[0035] Figure 4 It is the main view of the second embodiment.

[0036] Figure 5 It is the main view of the third embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following is further described in detail through specific implementation methods:

[0038] The marks in the drawings of the specification include: part 1, support block 2, limiting rib 21, roller 3, annular groove 31, limiting block 4, limiting column 5, support block 6, beam 7, square hole 8, protrusion 9, mounting plate 10, rib 11, bottom groove 12, annular rib 13, ball 14, rotating shaft 15.

[0039] Embodiment 1

[0040] like Figures 1 to 3 As shown, a large heavy workpiece carrying and conveying system for an automatic production line of a heat treatment furnace includes a support assembly, a track assembly located above the support assembly, and a plurality of support blocks 2 located above the track assembly (for the convenience of showing the structure, Figure 1 Only one support block 2) is retained.

[0041] The support assembly includes a plurality of beams 7 arranged at intervals on the ground and support blocks 6 welded and fixed above the beams 7. Figure 1 and Figure 2 As shown, the cross section of the cross beam 7 is an I-shaped cross section, the cross beam 7 is embedded in the refractory bricks in the heat treatment furnace, and the width of the upper plane of the cross beam 7 is smaller than the width of the lower plane, and a plurality of square holes 8 are opened in the middle of the cross beam 7. Figure 2 and Figure 3 As shown, a groove is formed on the top of the support block 6 , and a bottom groove 12 is formed on the bottom of the support block 6 .

[0042] like Figure 2 and Figure 3 As shown, the track assembly includes two sets of roller frames mounted in the grooves of the support block 6 and rollers 3 rotatably connected to the roller frames, and the two sets of roller frames are arranged parallel to each other. Figure 3 As shown, each group of roller frames includes two mounting plates 10 parallel to each other and a plurality of ribs 11 welded and fixed between the mounting plates 10, the ribs 11 are perpendicular to the two mounting plates 10, and the plurality of ribs 11 are arranged at equal distances along the length direction of the mounting plates 10, so as to fix the two mounting plates 10, so that a space for accommodating the rotation of the roller 3 is formed between the two mounting plates 10; a plurality of protrusions 9 are welded and fixed on both sides of each mounting plate 10, the protrusions 9 correspond to the positions and numbers of the support blocks 6, the protrusions 9 protrude toward both sides and the bottom of the mounting plates 10, the bottom of the protrusions 9 contacts the bottom of the groove of the support block 6, so that the inner side of the groove of the support block 6 limits the side of the protrusion 9; the bottom surface of the groove of the support block 6 supports the bottom surface of the protrusion 9, so that a gap is formed between the roller frame and the bottom of the groove of the support block 6, thereby reducing deformation and improving smoothness.

[0043] like Figure 1As shown in the figure, a plurality of U-shaped grooves are formed in the upper part of the mounting plate 10 along the length direction. The roller 3 is rotatably connected to the U-shaped groove through a rotating shaft 15. The mounting plate 10 is a segmented type with the head and tail connected. A connecting component is provided between each adjacent mounting plate 10. The connecting component includes a limiting groove fixed on the support block 6, a limiting post 5 located in the limiting groove, and a limiting block 4 pressed above the limiting post 5. One end of the limiting post 5 is vertically fixed on the outer side surface of the mounting plate 10, and the end of the limiting post 5 far from the outer side surface of the mounting plate 10 extends into the limiting groove; the limiting block 4 is L-shaped. The long arm end of the limiting block 4 is welded and fixed to the top of the support block 6, and the short arm end of the limiting block 4 is pressed against the upper part of the limiting post 5 to limit the mounting plate 10 in the vertical direction.

[0044] The structure of the supporting block 2 is as Figure 1 and Figure 3 shown. The supporting block 2 is strip-shaped. A limiting rib 21 protruding downward is provided at the bottom of the supporting block 2. A ring groove 31 is formed in the outer circumference of the roller 3. The limiting rib 21 is located in the ring groove 31, and the bottom of the limiting rib 21 does not contact the bottom of the ring groove 31. The ring groove 31 is used to guide the limiting rib 21; and the width of the supporting block 2 is smaller than the width of the roller 3, so that the roller 3 can form a complete support for the supporting block 2.

[0045] The usage method of the present utility model is as follows:

[0046] First, place the supporting block 2 on the roller 3 so that the limiting rib 21 at the bottom of the supporting block 2 is located in the ring groove 31 of the roller 3. Then, place the part 1 on the two supporting blocks 2. Multiple workpieces can be placed on each supporting block 2; push the supporting block 2 along the direction of the roller path, and the roller 3 can drive the supporting block 2 to move by rotation. The ring groove 31 on the roller 3 forms a guiding channel for the limiting rib 21 at the bottom of the supporting block 2, so that the supporting block 2 can convey the workpiece to the heat treatment furnace along the direction of the roller path.

[0047] Embodiment Two

[0048] This embodiment discloses a roller structure applicable to the roller path frame of Embodiment One, as Figure 4 shown. Bulging annular ribs 13 are provided at both ends of the roller 3. The annular ribs 13 are located on the outer ring of the rotating shaft 15. The advantage of this structure is that after the roller 3 is installed between the two mounting plates 10, the end faces of the roller 3 are prone to friction with the inner wall surfaces of the two mounting plates 10 during rotation, and the frictional force will hinder the rotation of the roller 3 and thus affect the smoothness and stability of the conveying of the part 1; after the annular ribs 13 are provided, only the annular ribs 13 will generate friction with the inner wall surface of the mounting plate 10 when the roller 3 rotates, and the area of the annular ribs 13 is smaller than the area of the end faces of the roller 3. Therefore, the frictional resistance is reduced, which helps the part 1 to be stably conveyed on the roller path.

[0049] Embodiment Three

[0050] This embodiment discloses another structure of the roller 3 applicable to the roller path frame in Embodiment 2. As Figure 5 shown, a circle of ball bearings 14 is evenly distributed on the outer end faces of the annular ribs 13 at both ends of the roller 3, and the ball bearings 14 can roll on the annular ribs 13. The advantage of this structure is that if the roller 3 comes into contact with the inner wall surfaces of the two mounting plates 10 when the roller 3 rotates, at this time, the ball bearings 14 and the mounting plates 10 are in rolling friction. Rolling friction can greatly reduce the frictional resistance, reduce the wear of the contact surface, reduce the vibration and noise when the roller 3 rotates, make the rotation of the roller 3 more stable, and is also beneficial to extending the service life of the roller 3, improving the smoothness of the rotation of the roller 3 and the smoothness of the conveying of the part 1.

[0051] The above are only embodiments of the present utility model. The present utility model is not limited to the fields involved in this embodiment case. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like recorded in the description can be used to interpret the content of the claims.

Claims

1. A large heavy workpiece carrying and conveying system for an automatic production line of a heat treatment furnace, comprising a support assembly and a track assembly located above the support assembly; characterized in that: The track assembly includes at least two groups of roller frames installed above the support assembly, the roller frames are arranged parallel to each other, rollers are arranged on the roller frames in rows for rotation, independent support blocks are arranged on the rollers at intervals, the support blocks are arranged along the conveying direction of the rollers, and each support block spans at least two rollers; an annular groove is opened on the outer periphery of the roller, and a downwardly protruding limiting rib is provided on the bottom of the support block, the limiting rib is located in the annular groove, and the annular groove is used to guide the limiting rib; the width of the support block is smaller than the width of the roller.

2. The large heavy workpiece carrier and transfer system for the automatic production line of the heat treatment furnace according to claim 1, characterized in that: Each set of roller frames includes two parallel mounting plates and a plurality of ribs fixed between the mounting plates. The mounting plates are segmented and connected end to end. A connecting assembly is provided between each adjacent mounting plate, and the connecting assembly is used to limit the vertical direction of the mounting plates.

3. The large heavy workpiece carrying and conveying system for the automatic production line of the heat treatment furnace according to claim 2, wherein: The support assembly includes a plurality of beams spaced apart on the ground and a support block fixed above the beams, a groove is provided above the support block, a bottom groove is provided below the support block, and the mounting plate is located in the groove.

4. The large heavy workpiece carrying and conveying system for the automatic production line of the heat treatment furnace according to claim 3, wherein: There is a gap between the bottom of the limiting rib and the bottom of the annular groove.

5. The large heavy workpiece supporting and conveying system for the automatic production line of the heat treatment furnace according to claim 4, characterized in that: A plurality of protrusions are arranged on both sides of each mounting plate, the protrusions correspond to the positions and quantities of the supporting blocks, the protrusions protrude toward both sides and the bottom of the mounting plate, and the bottoms of the protrusions contact the bottoms of the grooves of the supporting blocks.

6. The large heavy workpiece supporting and conveying system for the automatic production line of the heat treatment furnace according to claim 5, characterized in that: The connecting assembly includes a limiting groove fixed on the supporting block, a limiting column located in the limiting groove and a limiting block pressed above the limiting column. One end of the limiting column is vertically fixed on the outer surface of the mounting plate, and the other end of the limiting column extends into the limiting groove.

7. The large heavy workpiece supporting and conveying system for the automatic production line of heat treatment furnace according to claim 6, characterized in that: The cross section of the cross beam is I-shaped, and the width of the upper plane of the cross beam is smaller than the width of the lower plane. A plurality of square holes are opened in the middle of the cross beam.

8. The large heavy workpiece carrying and conveying system for the automatic production line of the heat treatment furnace according to claim 7, characterized in that: Both ends of the roller are provided with protruding annular ribs, and the annular ribs are located on the outer ring of the rotating shaft of the roller.

9. The large heavy workpiece carrying and conveying system for the automatic production line of a heat treatment furnace according to claim 8, characterized in that: A circle of balls is evenly distributed on the outer end surface of the annular rib, and the balls can roll on the annular rib.

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