Novel heat-resistant tray for pit furnace

Abstract

The utility model relates to the field of heat treatment trays, in particular to a novel heat-resistant tray for a pit furnace, which comprises a sleeving structure and a corbel structure connected to the outer side of the sleeving structure, the corbel structure comprises a plurality of main reinforcements in an annular array, a plurality of auxiliary reinforcements are respectively connected between two adjacent main reinforcements, and the auxiliary reinforcements are connected with the sleeving structure. The auxiliary ribs are arranged at intervals in the radial direction of the sleeving structure, the lengths of the auxiliary ribs are sequentially increased, the auxiliary ribs in the circumferential direction of the sleeving structure are arranged in a staggered mode, and a plurality of inner grooves with the same wall thickness are formed in the two sides of each main rib at intervals. The main ribs and the auxiliary ribs are evenly distributed and have a synergistic effect, the bearing capacity and the structural stability of the tray are further enhanced, the deformation and damage risks of the tray under the high-temperature and heavy-load conditions are reduced, the S-shaped auxiliary ribs are arranged at intervals in the radial direction of the sleeving structure, the lengths of the auxiliary ribs are sequentially increased, and the auxiliary ribs can adapt to the radius of the tray to gradually enhance the outer edge supporting strength. Outer edge stress concentration caused by centrifugal force is compensated, and deformation or breakage of the tray at high temperature is prevented.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment trays, and in particular to a new type of heat-resistant tray for pit furnaces. Background Technology

[0002] Pit furnaces are a new type of industrial heating equipment with a vertical structure design. They are widely used in many industrial fields such as metal heat treatment, ceramic sintering, and powder metallurgy. Their core advantage lies in achieving efficient heating through the vertical furnace structure. They are especially suitable for processing long shaft parts and batch workpieces. Because the furnace chamber has a deep pit structure, operators can vertically hoist the workpiece to the furnace opening and accurately place it on the tray. This design can make full use of the vertical space of the furnace chamber and significantly improve the capacity of a single heat treatment operation.

[0003] However, the pallets and workpiece bearing fixtures that are used with traditional pit furnaces have significant technical defects. Currently, most of the mainstream pallet structures on the market adopt a split welding process or modular connection through bolts. When such designs are used for a long time in high-temperature environments, the materials are prone to fatigue damage due to repeated thermal cycling, which leads to irreversible deformation of the structure. Especially in the application scenarios of composite materials with mismatched thermal expansion coefficients, local thermal stress concentration may cause structural distortion or even cracking, which seriously affects the service life of the pallet. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a new type of heat-resistant tray for pit furnaces, which can reduce fatigue damage to the tray, reduce the risk of tray deformation, twisting and cracking, and improve the service life of the tray.

[0005] To solve the above-mentioned technical problems, the present invention provides a novel heat-resistant tray for a pit furnace, comprising: a set structure and a support arm structure connected to its outer side. The support arm structure includes a plurality of main ribs arranged in a ring array. A plurality of secondary ribs are connected between two adjacent main ribs. The secondary ribs are arranged at intervals along the radial direction of the set structure and their lengths increase sequentially. The secondary ribs are staggered along the circumferential direction of the set structure. A plurality of inner grooves of equal wall thickness are spaced apart on both sides of the main ribs. The inner grooves are located between two adjacent secondary ribs, and the corresponding inner grooves are provided with corresponding ends of the secondary ribs distributed along the circumferential direction of the set structure.

[0006] By adopting the above technical solutions, the kit structure is used to assemble with the central shaft of the pit furnace, ensuring the overall stability of the tray and providing an installation foundation for the support arm structure. The main ribs provide radial and circumferential support, distributing the weight of the workpiece, and their uniform stress structure avoids local overload. The ring layout adapts to the cylindrical cavity of the pit furnace, improving space utilization. The secondary ribs gradually increase the outer edge support strength as the tray increases, to compensate for the stress concentration at the outer edge caused by centrifugal force, preventing the tray from deforming or breaking at high temperatures. The circumferential staggered arrangement of the secondary ribs can break the thermal stress resonance effect caused by regular arrangement, further improving the torsional stiffness and load-bearing capacity of the structure, and dispersing the local stress caused by uneven thermal expansion, reducing the risk of cracking. The uniform wall thickness of the inner groove reduces the weight while maintaining structural strength, and avoids uneven cooling and shrinkage. The inner groove and the end of the secondary rib also enhance the shear resistance of the connection node, preventing connection failure caused by high temperature creep and reducing the need for welding or bolt fixing.

[0007] In a preferred embodiment, the present invention can be further configured as follows: the kit structure includes a kit body with an internal spline structure, the outer side of the kit body has a plurality of connecting ribs arranged in a ring, and also includes a connecting plate, the outer side of the connecting plate is connected to the main rib, the inner side is connected to the connecting rib, and the connecting plate has a plurality of plate holes arranged in a ring, the plate holes being respectively located close to the outer side of the connecting plate.

[0008] By adopting the above technical solution, the spline structure inside the main body of the kit is precisely matched with the central shaft of the pit furnace to achieve axial positioning, thereby preventing the tray from rotating and improving its stability during use. At the same time, the annular array of connecting ribs evenly transmits radial loads, optimizes the load transmission path, avoids local overload, and the plate holes enhance heat convection in the outer edge area, alleviating radial temperature differences. It also facilitates visual inspection of the finished product to check for obvious defects.

[0009] In a preferred embodiment, the present invention can be further configured such that: a plurality of reinforcing ribs are provided at intervals and symmetrically on the opposite side of the main ribs, and the reinforcing ribs are all located close to the sleeve structure and are respectively connected to the corresponding secondary ribs.

[0010] By adopting the above technical solutions, the overall structure of the reinforced bracket is strengthened, the force on both sides of the main reinforcement is balanced, and plastic deformation caused by unilateral overload is avoided. In particular, under high temperature creep conditions, it can delay structural instability and reduce the risk of thermal stress concentration.

[0011] In a preferred embodiment, this utility model can be further configured such that at least two stress relief holes are provided at intervals on the secondary ribs.

[0012] By adopting the above technical solution, the stress relief hole breaks the continuity of the secondary reinforcement, realizes stress redistribution, and forms a stress diffusion zone at the edge of the corresponding hole, further reducing thermal stress.

[0013] In a preferred embodiment, the present invention can be further configured such that the cross-sections of the secondary reinforcing bars are S-shaped.

[0014] By adopting the above technical solutions, the S-shaped cross section enhances bending and torsional stiffness, reduces deformation at high temperatures, prevents stress concentration, and improves fatigue life.

[0015] In summary, this utility model includes at least one of the following beneficial technical effects of a novel heat-resistant tray for pit furnaces:

[0016] 1. The main and secondary ribs are evenly distributed and work together to further enhance the load-bearing capacity and structural stability of the pallet, reducing the risk of deformation and damage under high temperature and heavy load conditions. The S-shaped secondary ribs are arranged at intervals along the radial direction of the assembly structure and their lengths increase sequentially, increasing the stress release of each ring and reducing the accumulation of thermal stress in repeated heating and cooling cycles. They can also adapt to the pallet radius and gradually increase the outer edge support strength to compensate for the stress concentration at the outer edge caused by centrifugal force, preventing the pallet from deforming or breaking at high temperatures. When the main ribs are under load, the equal wall thickness inner groove can distribute the stress more evenly to various parts of the main ribs, while avoiding uneven cooling and shrinkage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a top view of the present invention.

[0020] In the diagram: 10. Kit structure; 20. Support arm structure;

[0021] 11. Main body of the assembly; 12. Connecting ribs; 13. Connecting plate; 14. Plate holes;

[0022] 21. Main reinforcement; 22. Secondary reinforcement; 23. Inner groove; 24. Reinforcing rib plate; 25. Stress relief hole. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0025] Reference Figure 1-2 This utility model discloses a novel heat-resistant tray for a pit-type furnace, comprising: a housing structure 10 and a support arm structure 20 connected to its outer side. The support arm structure 20 includes a plurality of main ribs 21 arranged in a ring array. A plurality of secondary ribs 22 are connected between two adjacent main ribs 21. The secondary ribs 22 are arranged at intervals along the radial direction of the housing structure 10 and their lengths increase sequentially. The secondary ribs 22 are staggered along the circumferential direction of the housing structure 10. A plurality of inner grooves 23 of equal wall thickness are provided at intervals on both sides of the main ribs 21. The inner grooves 23 are located between two adjacent secondary ribs 22, and the corresponding inner grooves 23 are provided with corresponding ends of the secondary ribs 22 distributed along the circumferential direction of the housing structure 10. At least two stress relief holes 25 are provided at intervals on the secondary ribs 22. The cross-section of the secondary ribs 22 is S-shaped.

[0026] The integrated structure 10 and support arm structure 20 are integrally molded and made of heat-resistant steel, allowing the entire pallet to be stably placed in the pit furnace and to bear the workpiece. Its overall structure avoids welding or splicing seams, reduces stress concentration points, and can evenly bear the weight of the workpiece, reducing the risk of local deformation. At the same time, the main ribs 21 and secondary ribs 22 are integrally molded structures, avoiding twisting or cracking caused by uneven thermal expansion. The evenly distributed grid structure of the main ribs 21 and secondary ribs 22 further enhances the load-bearing capacity and structural stability of the pallet, reduces the risk of deformation and damage of the pallet under high temperature and heavy load conditions, and prevents excessive local stress. The S-shaped secondary ribs 22 are arranged at intervals along the radial direction of the integrated structure 10 with progressively increasing lengths, which can adapt to the load-bearing requirements of the pallet radius and better disperse circumferential stress, making the pallet load more even. When the main ribs 21 bear the load, the equal wall thickness inner groove 23 can distribute the stress more evenly to all parts of the main ribs 21, avoiding excessive stress concentration in a certain local area. This is beneficial to the casting process and can also avoid uneven cooling and shrinkage.

[0027] The assembly structure 10 includes an assembly body 11 with an internal spline structure. The outer side of the assembly body 11 has a number of connecting ribs 12 arranged in a ring. It also includes a connecting plate 13. The outer side of the connecting plate 13 is connected to the main rib 21, and the inner side is connected to the connecting rib 12. The connecting plate 13 has a number of plate holes 14 arranged in a ring. The plate holes 14 are respectively located close to the outer side of the connecting plate 13.

[0028] The internal spline structure within the main body 11 is compatible with and precisely matches the matching rod of the pit furnace. The special shape of the internal spline provides a precise positioning reference. During installation, operators can quickly and accurately install the main body 11 onto the rod according to the spline fit, ensuring the position of the tray within the pit furnace and preventing radial or axial displacement of the main body 11 on the rod. The main body 11, connecting rib 12, and connecting plate 13 are integrally cast, and the connecting rib 12 serves as a transition component between the main body 11 and the connecting plate 13, firmly connecting the main body 11 to the connecting plate 13. Through its own strength and rigidity, it effectively transmits the load and torque borne by the main body 11 to the connecting plate 13, thereby distributing it to the entire support arm structure 20, enhancing the connection reliability between the main body structure 10 and the support arm structure 20. Furthermore, the plate hole 14 effectively reduces the weight of the connecting plate 13 and facilitates visual inspection of the finished product for obvious defects.

[0029] Several reinforcing ribs 24 are provided at intervals and symmetrically on the opposite side of the main ribs 21. The reinforcing ribs 24 are all located close to the sleeve structure 10 and are connected to the corresponding secondary ribs 22.

[0030] Between two adjacent main ribs 21 are two sets of reinforcing ribs 24. Each set of reinforcing ribs 24 is symmetrically arranged. The reinforcing ribs 24 tightly connect the main ribs 21 and the secondary ribs 22 and are cast in one piece, which enhances the connection strength and stability between the two. Its overall surface is flat, making the workpiece more stable and reducing deformation or differences in microstructure and properties caused by uneven support during heat treatment. When the pallet carries the workpiece, it can more effectively transfer the load borne by the main ribs 21 to the secondary ribs 22, realize the reasonable distribution of load within the support structure 20, and further enhance the load-bearing effect of the main ribs 21, preventing the main ribs 21 from deforming or being damaged due to excessive local stress, thereby improving the overall load-bearing efficiency of the pallet.

[0031] The implementation principle of this embodiment is as follows: During use, the pallet is assembled with the matching rods inside the pit furnace through the internal spline structure within the main body 11. The workpiece to be heat-treated is placed on the main ribs 21 and secondary ribs 22. When sent into the pit furnace for heat treatment, the main ribs 21 and secondary ribs 22 are evenly distributed to enhance the overall load-bearing capacity and structural stability of the pallet, reducing the risk of deformation and damage to the pallet under high temperature and heavy load conditions. The S-shaped secondary ribs 22 are arranged at intervals along the radial direction of the main body 10 and their lengths increase sequentially, which can adapt to the load-bearing requirements of the pallet radius and better disperse circumferential stress, making the load on the pallet more uniform. At the same time, when the main ribs 21 bear the load, the inner groove 23 can distribute the stress more evenly to various parts of the main ribs 21, ensuring that the pallet maintains structural stability under high temperature and heavy load conditions, so as to ensure that the pallet is suitable for heat treatment of heavy or irregularly shaped workpieces.

[0032] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A novel heat-resistant tray for a pit furnace, characterized in that, include: The assembly structure (10) and the support arm structure (20) connected to its outer side are provided. The support arm structure (20) includes a number of main ribs (21) arranged in a ring array. A number of secondary ribs (22) are connected between two adjacent main ribs (21). The secondary ribs (22) are arranged at intervals along the radial direction of the assembly structure (10) and their lengths increase sequentially. The secondary ribs (22) along the circumferential direction of the assembly structure (10) are staggered. A number of inner grooves (23) with equal wall thickness are provided on both sides of the main ribs (21). The inner grooves (23) are located between two adjacent secondary ribs (22), and the corresponding inner grooves (23) are provided with the ends of the secondary ribs (22) distributed along the circumferential direction of the assembly structure (10).

2. The novel heat-resistant tray for a pit furnace according to claim 1, characterized in that, The assembly structure (10) includes an assembly body (11) with an internal spline structure. The outer side of the assembly body (11) has a number of connecting ribs (12) arranged in a ring. It also includes a connecting plate (13). The outer side of the connecting plate (13) is connected to the main rib (21), and the inner side is connected to the connecting rib (12). The connecting plate (13) has a number of plate holes (14) arranged in a ring. The plate holes (14) are respectively located close to the outer side of the connecting plate (13).

3. The novel heat-resistant tray for a pit furnace according to claim 1, characterized in that, On the opposite side of the main reinforcement (21), a number of reinforcing ribs (24) are provided at intervals and symmetrically. The reinforcing ribs (24) are all located close to the sleeve structure (10) and are respectively connected to the corresponding secondary reinforcement (22).

4. A novel heat-resistant tray for a pit furnace according to claim 1, characterized in that, The secondary reinforcement (22) has at least two stress relief holes (25) spaced apart.

5. A novel heat-resistant tray for a pit furnace according to claim 1, characterized in that, The cross-sections of the secondary reinforcement (22) are S-shaped.

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