Workpiece heating furnace

Abstract

The invention belongs to the technical field of workpiece machining, and particularly relates to a workpiece heating furnace. The furnace bottom is arranged on the machine base, the furnace bottom is annular, and the annular furnace bottom is connected with a driving assembly for driving the annular furnace bottom to rotate around the center of the furnace bottom; the furnace cover is arranged on the machine base, and the furnace cover covers part of the furnace bottom; the furnace cover is connected with a heating assembly, and a heating cavity is formed in the furnace cover; the furnace cover is provided with an inlet and an outlet, the furnace bottom located outside the furnace cover is used for containing workpieces, and the workpieces are driven by the furnace bottom to enter the furnace cover from the inlet or be sent out of the furnace cover from the inlet. Due to the fact that conveying of the workpieces is controlled by the driving assembly, a user can control the amount of the workpieces fed into the heating furnace by controlling starting and stopping of the feeding assembly, namely the amount of the workpieces fed according to the needed machining amount, and the situation that the workpieces are left in the heating furnace for secondary heating is effectively prevented.

Description

TECHNICAL FIELD

[0001] The patent belongs to the technical field of workpiece processing, and particularly relates to a workpiece heating furnace. BACKGROUND

[0002] Before red punching processing is performed on a workpiece, the workpiece also needs to be heated. Heating is generally performed by a heating furnace while conveying. The existing heating furnace is generally in the form of a push rod, which pushes workpieces into the heating furnace one by one, and the conveying is achieved by pushing a workpiece by the next workpiece.

[0003] The following defects exist in this mode: when workpiece processing is paused, the workpieces in the furnace cannot be taken out in time, so that when the processing is resumed, the workpieces in the heating furnace will be heated again, thereby affecting the final quality of the workpieces. SUMMARY

[0004] The purpose of the patent is to provide a workpiece heating furnace capable of effectively reducing the situation of secondary heating of workpieces.

[0005] The purpose of the patent is achieved in the following manner:

[0006] A workpiece heating furnace comprises:

[0007] a machine base;

[0008] a furnace bottom arranged on the machine base, the furnace bottom being annular, and the annular furnace bottom being connected with a driving assembly for driving the furnace bottom to rotate around the center of the furnace bottom;

[0009] a furnace cover arranged on the machine base, the furnace cover covering part of the furnace bottom; the furnace cover being connected with a heating assembly, and a heating cavity being formed in the furnace cover;

[0010] The furnace cover has an inlet and an outlet, the furnace bottom outside the furnace cover is used for placing workpieces, and the workpieces are driven by the furnace bottom to enter the furnace cover from the inlet or to be sent out of the furnace cover from the inlet.

[0011] Further, the driving assembly comprises an inner rotating ring and an outer rotating ring arranged inside and outside, the inner rotating ring is fixed on the machine base, the outer rotating ring is connected with the furnace bottom, a sliding connection part is arranged between the inner rotating ring and the outer rotating ring, the sliding connection part is used for enabling the outer rotating ring to slide relative to the inner rotating ring, and the driving assembly further comprises a driving source for driving the outer rotating ring to slide around the inner rotating ring.

[0012] Further, a height difference is arranged between the inner rotating ring and the outer rotating ring, and the outer rotating ring is suspended above the machine base through the sliding connection part.

[0013] Further, the outer ring surface of the outer rotating ring is a tooth surface, and the driving source comprises a rotating gear engaged with the outer rotating ring.

[0014] Further, the outer rotating ring and the inner side of the inner rotating ring are provided with opposite ring grooves, and the two ring grooves are matched to form a channel, and the sliding connection part comprises a plurality of sliding balls located in the channel.

[0015] Further, the furnace bottom comprises a support seat and a refractory brick fixed on the support seat, and the refractory brick is used for placing the workpiece; the support seat is connected with the driving assembly.

[0016] Further, the refractory brick is provided with a placing groove for placing the workpiece.

[0017] Further, the furnace cover comprises a plurality of fan-shaped cover bodies which are sequentially buckled on the furnace bottom, and the plurality of fan-shaped cover bodies are sequentially connected.

[0018] Further, the top of the furnace cover is provided with a plurality of heating holes, and the heating assembly comprises a plurality of heating spray pipes inserted in the heating holes, and the heating spray pipes are connected with a heating source for heating the heating cavity.

[0019] Further, the center of the furnace bottom is provided with a main conveying pipe, and the top of the main conveying pipe is provided with a flow dividing head; the heating spray pipe is connected with an auxiliary conveying pipe, and a plurality of auxiliary conveying pipes are connected with the flow dividing head in the furnace bottom.

[0020] The patent has the following outstanding and beneficial technical effects compared with the prior art:

[0021] 1. In the patent, the conveying of the workpiece is controlled by the driving assembly, so that the user can control the amount of workpiece sent into the heating furnace by controlling the start and stop of the feeding assembly, that is, the amount of workpiece sent in is equal to the amount of workpiece needed for processing, thereby effectively preventing the workpiece from being left in the heating furnace for secondary heating.

[0022] 2. The driving form of the inner rotating ring and the outer rotating ring is different from the conveying structure in the traditional industry, and the conveying structure in the patent is suitable for the work of the heating furnace and will not be affected by the high temperature of the heating furnace.

[0023] 3. The annular furnace bottom structure effectively reduces the land size, and is more flexible to install and use.

[0024] 4. The heating spray pipe is sequentially connected to the flow dividing head through the auxiliary conveying pipe, and all the pipes are conveyed with natural gas through the main conveying pipe, thereby effectively utilizing the central space of the annular structure of the furnace bottom and saving the volume. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of a workpiece processing flow line.

[0026] Figure 2 is an explosion schematic view of a workpiece heating furnace.

[0027] Figure 3 is a schematic view of the structure of the outer rotating ring and the outer rotating ring.

[0028] Figure 4 is a schematic view of the cross section of the workpiece heating furnace.

[0029] Figure 5 is a schematic view of the structure of the heating device.

[0030] Figure 6 is a schematic view of the first control valve.

[0031] Figure 7 is a schematic view of the first control valve.

[0032] Figure 8 is a schematic view of the cross section of the nozzle.

[0033] Meaning of the reference signs in the figures:

[0034] 1, base;

[0035] 2, furnace bottom; 21, refractory brick; 211, placing groove; 22, support seat; 221, blocking edge;

[0036] 3, driving assembly; 31, inner rotating ring; 32, outer rotating ring; 331, ring groove; 332, sliding ball; 34, rotating gear;

[0037] 4, furnace cover; 41, heating cavity; 42, inlet; 43, outlet; 44, fan-shaped cover body; 45, heating hole;

[0038] 5, heating nozzle; 51, nozzle cavity; 52, gas outlet; 53, partition plate; 531, booster hole; 54, flow divider; 541, main nozzle; 542, auxiliary nozzle; 55, first connecting section; 56, second connecting section; 57, third connecting section;

[0039] 6, main conveying pipe; 61, flow divider; 62, auxiliary conveying pipe; 63, first control valve; 631, valve body; 632, inlet cavity; 633, outlet cavity; 634, valve core; 635, V-shaped opening; 636, stepper motor; 64, pressure source; 65, gas source;

[0040] 7, feeding mechanism; 71, vibrating disc; 72, conveying channel; 8, discharging mechanism; 81, mechanical hand; 82, conveying belt; DETAILED DESCRIPTION

[0041] The patent will be further described below in combination with specific embodiments:

[0042] A workpiece heating furnace, such as Figure 1As shown, the workpiece heating furnace in the patent is applied in a red punching workpiece processing assembly line, the workpiece heating furnace is located in the middle of the assembly line, and the workpiece heating furnace is provided with a feeding mechanism 7 and a discharging mechanism 8 on both sides of the workpiece heating furnace, the feeding mechanism 7 is used for carrying the workpiece into the workpiece heating furnace, and the discharging mechanism 8 is used for carrying the workpiece out of the workpiece heating furnace. Specifically, the feeding mechanism 7 is a vibrating disc 71, the vibrating disc 71 is connected with a conveying channel 72, the conveying channel 72 is connected to the workpiece heating furnace, and the workpiece can be gradually fed into the workpiece heating furnace through the vibrating disc 71; the discharging mechanism 8 is specifically a conveying belt 82, one end of the conveying belt 82 is provided with a mechanical hand 81 located on one side of the workpiece heating furnace, and the workpiece is carried to the conveying belt 82 by the mechanical hand 81 after the workpiece is heated, and the workpiece is sent out by the conveying belt 82.

[0043] As shown in combination Figure 1 , 2 As shown, the workpiece heating furnace includes a base 1, a furnace bottom 2 and a furnace cover 4, the base 1 is annular as a whole, and the annular furnace bottom 2 corresponds to the base 1, supports can be arranged below the base 1 to support the entire base 1, so that the height of the base 1 corresponds to the feeding mechanism 7 and the discharging mechanism 8. The furnace bottom 2 is arranged on the base 1, and the annular furnace bottom 2 is connected with a driving assembly 3 for driving the furnace bottom 2 to rotate around the center of the furnace bottom 2; the furnace cover 4 is arranged on the base 1; the furnace cover 4 covers part of the furnace bottom 2; the furnace cover 4 is connected with a heating assembly, and a heating cavity 41 is formed in the furnace cover 4. Among them, the furnace cover 4 has an inlet 42 and an outlet 43, the furnace bottom 2 located outside the furnace cover 4 is used for placing the workpiece, and the workpiece is driven by the furnace bottom 2 to enter the furnace cover 4 from the inlet 42 or to be sent out of the furnace cover 4 from the inlet 42.

[0044] As shown in combination Figures 1-3 As shown, the base 1 in the patent includes a support seat 22 and firebricks 21 fixed on the support seat 22, the support seat 22 is annular as a whole, and the edge of the support seat 22 is provided with a stop edge 221, the firebricks 21 have a plurality of blocks, the longitudinal section of each block is fan-shaped, a plurality of firebricks 21 are arranged in sequence on the support seat 22 to form a ring structure, and the firebricks 21 are limited by the stop edge 221 of the edge of the support seat 22. The driving assembly 3 is connected below the support seat 22, and the upper surface of the firebricks 21 is used for placing the workpiece, the support seat 22 is driven to rotate by the driving assembly 3, the firebricks 21 are driven to move, and the workpiece on the firebricks 21 is driven to move. In order to facilitate the placement of the workpiece, a placement groove 211 is burned on the firebricks 21 during the burning of the firebricks 21, so that the workpiece can be better placed.

[0045] As shown in combination Figures 2-4As shown, the driving assembly 3 comprises an inner rotating ring 31 and an outer rotating ring 32 arranged inside and outside, the inner rotating ring 31 is fixed on the base 1, the outer rotating ring 32 is connected with the furnace bottom 2, a sliding connection part is arranged between the inner rotating ring 31 and the outer rotating ring 32, which is used to make the outer rotating ring 32 slide relative to the inner rotating ring 31; the driving assembly 3 further comprises a driving source for driving the outer rotating ring 32 to slide around the inner rotating ring 31.

[0046] In this embodiment, the inner rotating ring 31 and the outer rotating ring 32 are made of metal material, a plurality of fastening holes are arranged on the inner rotating ring 31 and the outer rotating ring 32 along the thickness direction, and the inner rotating ring 31 and the outer rotating ring 32 are respectively fixed on the base 1 and the furnace bottom 2 by arranging fasteners in the fastening holes. The fastener is a fastening screw, and the plurality of fastening holes are arranged in sequence, and the connection is realized by installing the fastener in the fastening hole.

[0047] Further, the inner side of the outer rotating ring 32 and the inner rotating ring 31 is provided with opposite ring grooves 331, and the sliding connection part comprises a plurality of sliding balls 332 located between the two ring grooves 331. The sliding ball 332 is made of steel material, and since the outer rotating ring 32 and the inner rotating ring 31 are arranged inside and outside, the sliding ball 332 is limited in the ring groove 331 on the inner side of the outer rotating ring 32 and the inner rotating ring 31. When the outer rotating ring 32 is driven to rotate, the sliding ball 332 slides between the outer rotating ring 32 and the inner rotating ring 31, so that the outer rotating ring 32 is in a flexible slidable state.

[0048] Further, the outer ring surface of the outer rotating ring 32 is a tooth surface, and the driving source comprises a rotating gear 34 engaged with the outer rotating ring 32. The rotating gear 34 is installed on the base 1 and located on one side of the outer rotating ring 32, and the motor is connected with the rotating gear 34. The motor drives the rotating gear 34 to rotate, and the rotating gear 34 is engaged with the outer rotating ring 32 to drive the outer rotating ring 32 to rotate. Since the sliding connection part is arranged between the outer rotating ring 32 and the inner rotating ring 31, the friction between the outer rotating ring 32 and the inner rotating ring 31 is low, and the rotating gear 34 can easily drive the outer rotating ring 32 to rotate. Moreover, in this embodiment, a height difference is arranged between the inner rotating ring 31 and the outer rotating ring 32, and the outer rotating ring 32 is suspended above the base 1 through the sliding connection part; that is, the steel ball supports the entire outer rotating ring 32 and supports the entire furnace bottom 2; therefore, only the rotating gear 34 can drive the outer rotating ring 32 to rotate.

[0049] Furthermore, the furnace hood 4 includes several fan-shaped cover bodies 44 sequentially fastened to the furnace bottom 2, with the fan-shaped cover bodies 44 connected in sequence. The fan-shaped cover bodies 44 are also made of refractory bricks 21, and the several fan-shaped cover bodies 44 connected in sequence cover most of the furnace bottom 2. The bottom of the fan-shaped cover bodies 44 is supported on the machine base 1. The side cross-section of the fan-shaped cover bodies 44 is "door" shaped. After the several fan-shaped cover bodies 44 are connected, inlet 42 and outlet 43 are formed at both ends. The inlet 42 and outlet 43 are located on the furnace bottom 2 outside the furnace hood 4. At this time, the workpiece can be driven by the furnace bottom 2 to enter the furnace hood 4 through the inlet 42 or be sent out of the furnace hood 4 through the inlet 42.

[0050] During operation, the feeding mechanism 7 places the workpiece on the furnace bottom 2 outside the furnace hood 4. The furnace bottom 2 moves in one direction under the drive of the drive assembly 3, so that the workpiece enters the furnace hood 4. Since the furnace hood 4 is connected to a heating assembly, the heating assembly heats the workpiece located in the heating chamber 41 inside the furnace hood 4. After the furnace bottom 2 rotates once, it is sent out from the other end of the furnace hood 4, that is, its outlet 43, and then sent out by the unloading assembly.

[0051] Since the workpiece conveying is controlled by the drive assembly 3, the user can control the amount of workpiece fed into the heating furnace by controlling the start and stop of the feeding assembly. This effectively prevents workpieces from remaining in the heating furnace for secondary heating. Furthermore, this patent's drive mechanism, using an inner rotating ring 31 and an outer rotating ring 32, differs from traditional industrial conveying structures. This conveying structure is adapted to the operation of the heating furnace and will not be affected by the furnace's high temperature. In addition, the annular furnace bottom 2 structure effectively reduces its footprint, making installation and use more flexible.

[0052] Furthermore, the top of the furnace hood 4 is provided with several heating holes 45, and the heating assembly includes several heating nozzles 5 inserted into the heating holes 45. The heating nozzles 5 are connected to a heating source for heating the heating chamber 41. The center of the furnace bottom 2 is provided with a main conveying pipe 6, and the top of the main conveying pipe 6 is provided with a branch head 61. The heating nozzles 5 are connected to auxiliary conveying pipes, and multiple auxiliary conveying pipes are connected to the branch head 61 located in the furnace bottom 2. The heating nozzles 5 are connected to the branch head 61 in sequence through the auxiliary conveying pipes, and natural gas is conveyed to all pipelines through the main conveying pipe 6, which effectively utilizes the central space of the annular structure of the furnace bottom 2 and saves volume.

[0053] Further, the heating source includes a gas source 65 and a pressure source 64. The gas source 65 is connected to a first control valve 63 located below the workpiece heating furnace. In practice, the gas source 65 is an external gas pipeline connected to the first control valve 63, which in turn connects to the main delivery pipe 6. The main delivery pipe 6 is vertically arranged, and the first control valve 63 is connected to the bottom of the main delivery pipe 6 via a pipeline. The pressure source 64 is specifically a fan, the fan's outlet connected to the bottom of the main delivery pipe 6 via a pipeline. The first control valve 63 controls the intake of the gas pipeline, and the fan's power is adjusted to control the air pressure. A distributor 61 is located at the top of the main delivery pipe 6.

[0054] During operation, the first control valve 63 opens, and the pressure source 64 operates simultaneously. At this time, both natural gas and outside air are simultaneously supplied to the main delivery pipe 6. The user can adjust the first control valve 63 and the fan power to obtain a suitable natural gas-air ratio, thereby obtaining the most suitable mixed gas for the heating furnace operation. This ensures that the natural gas content in the mixed gas meets the combustion requirements and has sufficient pressure. Driven by the pressure source 64, the mixed gas is sent into the heating nozzle 5 and then injected into the workpiece heating furnace. Combustion can then be achieved simply by heating the workpiece in the heating furnace.

[0055] In summary, this patent pre-mixes the gas and air through the main delivery pipe 6 structure, and then distributes them into different heating nozzles 5 to achieve heating. Users can effectively control the ratio of gas to air through the first control valve 63, which can save gas and reduce costs while ensuring the normal operation of the workpiece heating furnace. Moreover, the main delivery pipe 6 diversion structure in this patent has a simple overall structure and is easy to set up.

[0056] Furthermore, the first control valve 63 includes a valve body 631, with an inlet chamber 632 and an outlet chamber 633 respectively on both sides of the valve body 631, and a valve core 634 slidingly disposed between the inlet chamber 632 and the outlet chamber 633. Figure 5 , 6As shown, a stepper motor 636 is actually provided on one side of the valve body 631. The valve core 634 is driven by the stepper motor 636. The valve body 631 is fixed to one end face of the stepper motor 636 by fasteners, and the valve core 634 is placed inside the valve body 631. The valve body 631 has through holes on the left and right sides, forming the air inlet chamber 632 and the air outlet chamber 633. The air inlet chamber 632 is connected to the external gas pipeline, and the air outlet chamber 633 is connected to the main delivery pipe 6. The valve core 634 is located between the air inlet chamber 632 and the air outlet chamber 633. The stepper motor 636 drives the valve core 634 to rise and fall, so that the valve core 634 blocks between the air inlet chamber 632 and the air outlet chamber 633, or connects the air inlet chamber 632 and the air outlet chamber 633.

[0057] Furthermore, such as Figure 7 As shown, one end of the valve core 634 is provided with an outwardly opening V-shaped opening 635. The two sides of the V-shaped opening 635 are respectively opposite to the air inlet chamber 632 and the air outlet chamber 633. During the opening of the valve core 634, the gas will enter the air outlet chamber 633 from the air inlet chamber 632 through the V-shaped opening 635. At this time, the gas intake volume depends on the size of the area where the end face of the air outlet chamber 633 intersects with the V-shaped opening 635. The size of the V-shaped opening 635 can help to better control the gas intake volume.

[0058] Furthermore, the heating nozzle 5 has a spray cavity 51 formed inside, and an air outlet 52 is provided at one end of the heating nozzle 5; the other end of the heating nozzle 5 is connected to the main delivery pipe 6. Figure 5 , 8 As shown, the heating nozzle 5 in this patent consists of three parts, including a cylindrical first connecting section 55. One end of the first connecting section 55 is connected to the diverter head 61 through a connecting pipe, and the other end is connected to the second connecting section 56. The other end of the second connecting section 56 is provided with a third connecting section 57. A partition 53 is fixed between the first connecting section 55 and the second connecting section 56. A small pressure boosting hole 531 is provided in the center of the partition 53. When the mixed gas passes through the small pressure boosting hole 531, its pressure is increased by compressing the size of the mixed gas, thereby obtaining a better gas ejection effect.

[0059] A flow divider 54 is also provided between the second connecting section 56 and the third connecting section 57. The other end of the third connecting section 57 has a gas outlet 52 for ejecting gas. The flow divider 54 is designed to optimize the combustion effect of the ejected gas. Specifically, the flow divider 54 has a main nozzle 541 at its center, and several auxiliary nozzles 542 are distributed along the outer edge of the main nozzle 541. The main nozzle 541 ejects the main flame, while the auxiliary nozzles 542 also eject auxiliary flames. However, because the main nozzle 541 is larger than the auxiliary nozzles 542, the outer flame of the auxiliary flame is located at the flame core of the main flame. This allows the outer flame of the auxiliary flame to compensate for the temperature at the flame core, resulting in better and more complete combustion of the gas.

[0060] The above embodiments are merely preferred embodiments of this patent and are not intended to limit the scope of protection of this patent. Therefore, all equivalent changes made to the structure, shape, and principle of this patent should be included within the scope of protection of this patent.

[0061] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this patent. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the efficacy or purpose of this patent, should still fall within the scope of the technical content disclosed in this patent. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this patent. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this patent's implementation.

[0062] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0063] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

Claims

1. A workpiece heating furnace, characterized in that, include: Base (1); A furnace bottom (2) is provided on the machine base (1). The furnace bottom (2) is annular, and the annular furnace bottom (2) is connected to a drive assembly (3) that drives it to rotate around the center of the furnace bottom (2). A furnace cover (4) is provided on the machine base (1), and the furnace cover (4) covers part of the furnace bottom (2); the furnace cover (4) is connected to a heating component, and a heating chamber (41) is formed inside the furnace cover (4); The furnace cover (4) has an inlet (42) and an outlet (43). The furnace bottom (2) located outside the furnace cover (4) is used to place the workpiece and to allow the workpiece to be driven by the furnace bottom (2) to enter the furnace cover (4) from the inlet (42) or to be sent out of the furnace cover (4) from the inlet (42).

2. The workpiece heating furnace according to claim 1, characterized in that: The drive assembly (3) includes an inner rotating ring (31) and an outer rotating ring (32) arranged inside and outside. The inner rotating ring (31) is fixed on the base (1), and the outer rotating ring (32) is connected to the furnace bottom (2). A sliding connection is provided between the inner rotating ring (31) and the outer rotating ring (32). The sliding connection is used to make the outer rotating ring (32) slide relative to the inner rotating ring (31). The drive assembly (3) also includes a drive source for driving the outer rotating ring (32) to slide around the inner rotating ring (31).

3. The workpiece heating furnace according to claim 2, characterized in that: There is a height difference between the inner rotating ring (31) and the outer rotating ring (32), and the outer rotating ring (32) is suspended above the base (1) by the sliding connection.

4. A workpiece heating furnace according to claim 2, characterized in that: The outer ring surface of the outer rotating ring (32) is a toothed surface, and the driving source includes a rotating gear (34) that meshes with the outer rotating ring (32).

5. A workpiece heating furnace according to claim 2, characterized in that: The outer rotating ring (32) and the inner rotating ring (31) are provided with opposing annular grooves (331) on their inner sides. The two annular grooves (331) are joined to form a channel. The sliding connection part includes a plurality of sliding balls (332) located in the channel.

6. A workpiece heating furnace according to any one of claims 1-5, characterized in that: The furnace bottom (2) includes a support base (22) and refractory bricks (21) fixed on the support base (22). The refractory bricks (21) are used to place workpieces. The support base (22) is connected to the drive assembly (3).

7. A workpiece heating furnace according to claim 6, characterized in that: The refractory brick (21) is provided with a placement groove (211) for placing the workpiece.

8. A workpiece heating furnace according to claim 1, characterized in that: The furnace cover (4) includes several fan-shaped covers (44) that are sequentially attached to the furnace bottom (2), and the fan-shaped covers (44) are connected in sequence.

9. A workpiece heating furnace according to claim 1, characterized in that: The top of the furnace cover (4) is provided with several heating holes (45), and the heating assembly includes several heating nozzles (5) inserted in the heating holes (45). The heating nozzles (5) are connected to a heating source and are used to heat the heating chamber (41).

10. A workpiece heating furnace according to claim 9, characterized in that: The furnace bottom (2) is provided with a main conveying pipe (6) at the center, and a diverter head (61) is provided at the top of the main conveying pipe (6); the heating spray pipe (5) is connected to an auxiliary conveying pipe, and multiple auxiliary conveying pipes are connected to the diverter head (61) located in the furnace bottom (2).

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