A pit-type annealing furnace for forging

Abstract

This invention discloses a pit-type annealing furnace for forging, relating to the field of annealing furnace technology. It includes an annealing furnace body and a furnace cover. Support blocks are symmetrically fixed to the outer wall of the annealing furnace body, and positioning rods are rotatably connected to the top of the support blocks. In this pit-type annealing furnace for forging, during the feeding process, the furnace cover can be positioned by two positioning rods, allowing the storage cylinder to fall smoothly into the interior of the annealing furnace body, avoiding friction with the inner wall of the annealing furnace body or the heating liner. Furthermore, the frustum-shaped top of the positioning rods allows for better insertion into the positioning holes during hoisting to complete the material dropping. During annealing, a motor drives multiple sets of disturbance plates to push the material in the storage cylinder, allowing the placed material to move within the annealing furnace body, ensuring uniform heating of the material and guaranteeing efficient annealing.

Description

Technical Field

[0001] This invention relates to the field of annealing furnace technology, specifically a pit-type annealing furnace for forging. Background Technology

[0002] Pit-type annealing furnaces provide a controlled temperature environment, allowing materials to be heated and slowly cooled at specified temperatures and times. Due to their vertical pit-like structure, pit-type annealing furnaces can achieve uniform heating of the materials to be treated, ensuring that the entire component or material receives uniform heat treatment within the furnace. They are widely used in metallurgy, machinery manufacturing, and other related fields to ensure the quality, performance, and safety of materials.

[0003] To ensure processing efficiency, existing pit-type annealing furnaces have relatively large furnace lids and bodies. Therefore, machines are generally used to lift the furnace lid and material racks via chains, and then move them horizontally to the furnace opening for feeding. However, due to the lack of limiting mechanisms, the material racks are prone to friction with the inner wall or heating liner of the annealing furnace as they fall into the furnace. This can easily cause damage to the inner wall or liner of the annealing furnace over a long period of use. Furthermore, since the materials are generally stacked vertically and then uniformly annealed in a pit-type annealing furnace, air circulation is not easy, which may lead to inconsistent temperatures throughout the furnace and thus affect annealing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a pit-type annealing furnace for forging, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a well-type annealing furnace for forging, comprising an annealing furnace body and a furnace cover, wherein support blocks are symmetrically and fixedly connected to the outer wall of the annealing furnace body, and a positioning rod is rotatably connected to the top of the support blocks; a positioning block is fixedly connected to the outer wall of the furnace cover corresponding to the furnace cover, and a positioning hole is provided through the bottom of the positioning block; the top of the positioning rod is frustum-shaped, so as to guide and position the furnace cover during the process of the furnace cover falling.

[0006] The outer wall of the annealing furnace body is provided with a driving component, the furnace cover has an inner cavity, and the inner wall of the inner cavity is provided with a disturbance mechanism. The inner wall of the inner cavity has a through groove corresponding to the disturbance mechanism. The driving component is driven by the disturbance mechanism so that after the furnace cover falls, the driving component drives the disturbance mechanism to push the material.

[0007] The disturbance mechanism includes a rotating rod, and storage cylinders are evenly spaced on the outer wall of the rotating rod. An auxiliary component is provided inside the storage cylinder to control the storage cylinder to vibrate up and down when the disturbance mechanism pushes the material.

[0008] Preferably, the driving component includes a motor, and an mounting ring is fitted to the outer wall of the motor. The two ends of the mounting ring are fixedly installed on the outer wall of the annealing furnace body. One end of the motor output shaft passes through the interior of one of the support blocks and is fixedly connected to the bottom of the positioning rod. A driving gear is fixedly connected to the outer wall of the positioning rod.

[0009] The top of the rotating rod extends through the bottom of the furnace cover into the interior of the cavity, and the extended end of the rotating rod is rotatably connected to the inner wall of the cavity. A transmission belt is rotatably connected to the outer wall of the extended end of the rotating rod, and a connecting rod is rotatably connected to the inner wall of the transmission belt. A driven gear is fixedly connected to the outer wall of the connecting rod, and the teeth of the driven gear match the teeth of the driving gear.

[0010] Preferably, the upper and lower ends of the connecting rod are rotatably connected to the inner wall of the inner cavity, and the outer wall of the rotating rod is provided with disturbance plates at equal distances from the storage cylinder, and the bottom of the disturbance plate slides in contact with the bottom inner wall of the storage cylinder.

[0011] Preferably, the outer wall of the rotating rod is provided with limit grooves at equal intervals, one end of the disturbance plate is fixedly connected to a limit block, and the limit block is T-shaped, the outer wall of the limit block is in contact with and slides against the inner wall of the limit groove.

[0012] Preferably, the other end of the disturbance plate slides against the inner wall of the storage cylinder, and the inner wall of the storage cylinder is provided with flow holes at equal intervals.

[0013] Preferably, the auxiliary component includes a slider, a groove is provided through the bottom center of the storage cylinder, the outer wall of the groove slides in contact with the outer wall of the rotating rod, and one end of the slider is fixed to the inner wall of the groove.

[0014] Preferably, the outer wall of the rotating rod is provided with spiral grooves at equal intervals corresponding to the slider, and the outer wall of the slider slides in contact with the inner wall of the spiral groove. The outer wall of the storage cylinder is symmetrically fixedly connected with guide blocks, and the inner wall of the annealing furnace body is symmetrically fixedly connected with limit strips corresponding to the guide blocks.

[0015] Preferably, the two side walls of the guide block slide in contact with the side wall of the two limiting strips, and the bottom of the guide block is inclined.

[0016] Preferably, heating tubes are fixedly installed at equal intervals on the inner wall of the annealing furnace body, and lifting lugs are fixedly installed on the top of the furnace cover.

[0017] Preferably, the bottom of the annealing furnace body is fixedly installed with legs at equal intervals, and the legs are provided with fixing nails inside.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. During the feeding process, the furnace cover can be positioned by two positioning rods, so that the storage cylinder can fall smoothly into the interior of the annealing furnace body, avoiding friction with the inner wall of the annealing furnace body or the heating inner liner. Furthermore, the frustum-shaped top of the positioning rods allows them to be better inserted into the positioning holes during hoisting to complete the material feeding.

[0020] 2. During the annealing process, the motor can drive multiple sets of disturbance plates to push the material in the storage cylinder, so that the placed material can move inside the annealing furnace body, ensuring that the material is heated evenly inside the annealing furnace body and guaranteeing the annealing efficiency of the material.

[0021] 2. During the annealing process, the storage cylinder can be restricted by two sets of limiting strips, allowing it to vibrate up and down under the guidance of the spiral groove. This enables the placed material to vibrate and turn over inside the storage cylinder, ensuring that all surfaces of the material are heated, thereby improving the annealing effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the overall hoisting state of the present invention;

[0024] Figure 3 This is a partial structural diagram of the entire invention;

[0025] Figure 4 This is a structural schematic diagram of another part of the overall invention;

[0026] Figure 5 This is a schematic diagram of the disturbance mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the auxiliary component of the present invention.

[0028] In the diagram: 1. Annealing furnace body; 2. Furnace cover; 3. Support block; 4. Positioning rod; 5. Positioning block; 6. Positioning hole; 7. Motor; 8. Mounting ring; 9. Drive gear; 10. Inner cavity; 12. Through groove; 13. Storage cylinder; 14. Flow hole; 16. Limiting strip; 17. Heating tube; 18. Lifting lug; 19. Support leg; 20. Fixing nail; 11. Disturbing mechanism; 1101. Rotating rod; 1102. Transmission belt; 1103. Connecting rod; 1104. Driven gear; 1105. Disturbing plate; 1106. Limiting groove; 1107. Limiting block; 15. Auxiliary component; 1501. Slider; 1502. Slide groove; 1503. Spiral groove; 1504. Guide block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1:

[0031] Please see Figure 1-6 The present invention provides a technical solution: a well-type annealing furnace for forging, including an annealing furnace body 1 and a furnace cover 2. Support blocks 3 are symmetrically fixedly connected to the outer wall of the annealing furnace body 1. The top of the positioning rod 4 is frustum-shaped so as to guide and position the furnace cover 2 during the process of the furnace cover 2 falling. Then, heating tubes 17 are fixedly installed at equal intervals on the inner wall of the annealing furnace body 1.

[0032] The outer wall of the annealing furnace body 1 is provided with a driving component, and the inner wall of the inner cavity 10 is provided with a disturbance mechanism 11. The driving component and the disturbance mechanism 11 are driven to push the material by the driving component after the furnace cover 2 is lowered.

[0033] Furthermore, the driving component includes a motor 7, and a mounting ring 8 is fitted to the outer wall of the motor 7. Both ends of the mounting ring 8 are fixedly mounted on the outer wall of the annealing furnace body 1. The disturbance mechanism 11 includes a rotating rod 1101, and storage cylinders 13 are evenly spaced on the outer wall of the rotating rod 1101. The top of the rotating rod 1101 extends through the bottom of the furnace cover 2 into the interior of the inner cavity 10. A driven gear 1104 is fixedly connected to the outer wall of the connecting rod 1103. The upper and lower ends are rotatably connected to the inner wall of the inner cavity 10, and the outer wall of the rotating rod 1101 is provided with limit grooves 1106 at equal intervals. Then, one end of the disturbance plate 1105 is fixedly connected to the limit block 1107, and the limit block 1107 is T-shaped. The outer wall of the limit block 1107 slides against the inner wall of the limit groove 1106. At the same time, the other end of the disturbance plate 1105 slides against the inner wall of the storage cylinder 13, and the inner wall of the storage cylinder 13 is provided with flow holes 14 at equal intervals.

[0034] More specifically, in this embodiment, when in use, the material is first placed in the storage cylinder 13. Then, the top of the furnace cover 2 is fixedly installed with a lifting lug 18, so that the chain can be connected to the lifting lug 18 and the furnace cover 2 can be lifted by a crane. Then, multiple storage cylinders 13 are connected to the furnace cover 2 through a rotating rod 1101, so that the material is lifted simultaneously when the furnace cover 2 is lifted. Then, the furnace cover 2 is lifted to the furnace opening of the annealing furnace body 1 and prepared for falling.

[0035] During the descent, a positioning rod 4 is rotatably connected to the top of the support block 3, and a positioning block 5 is fixedly connected to the outer wall of the furnace cover 2. A positioning hole 6 is opened through the bottom of the positioning block 5, so that the furnace cover 2 can be moved so that the positioning hole 6 is aligned with the top of the positioning rod 4. The top of the positioning rod 4 is truncated cone-shaped, so that the positioning rod 4 can be better inserted into the positioning hole 6 to complete the positioning during the hoisting process. Thus, the descent of the furnace cover 2 can be positioned by the two positioning rods 4, so that the storage cylinder 13 can fall smoothly into the interior of the annealing furnace body 1.

[0036] Next, support legs 19 are fixedly installed at equal intervals at the bottom of the annealing furnace body 1, and fixing nails 20 are provided inside the support legs 19. The cooperation between the support legs 19 and the fixing nails 20 can enhance the overall stability of the annealing furnace body 1 and ensure the positioning accuracy of the positioning rod 4.

[0037] Next, when the bottom of the furnace cover 2 is in contact with the furnace opening of the annealing furnace body 1, the furnace cover 2 is connected to the annealing furnace body 1 by bolts and the chain is released. At this time, the heating tubes 17, which are fixedly installed at equal intervals on the inner wall of the annealing furnace body 1, can be used to heat and anneal the material.

[0038] Next, during the processing, the motor 7 is started. The output shaft of the motor 7 passes through the inside of a support block 3 and is fixedly connected to the bottom of the positioning rod 4. The outer wall of the positioning rod 4 is fixedly connected to the drive gear 9, so the motor 7 can drive the drive gear 9 to rotate. Then, the furnace cover 2 has an inner cavity 10, and the inner wall of the inner cavity 10 has a through groove 12 corresponding to the disturbance mechanism 11. The teeth of the driven gear 1104 match the teeth of the drive gear 9. So when the bottom of the furnace cover 2 is in contact with the furnace opening of the annealing furnace body 1, the drive gear 9 will mesh with the driven gear 1104, and the motor 7 can synchronously drive the driven gear 1104 to rotate.

[0039] Next, the extended end of the rotating rod 1101 is rotatably connected to the inner wall of the inner cavity 10, and the outer wall of the extended end of the rotating rod 1101 is rotatably connected to the transmission belt 1102, and the inner wall of the transmission belt 1102 is rotatably connected to the connecting rod 1103. At the same time, the outer wall of the connecting rod 1103 is fixedly connected to the driven gear 1104, so that the rotation of the driven gear 1104 can drive the rotation of the connecting rod 1103, and then the transmission belt 1102 can synchronously drive the rotating rod 1101 to rotate.

[0040] Next, disturbance plates 1105 are provided at equal intervals on the outer wall of the rotating rod 1101 corresponding to the storage cylinder 13. The bottom of the disturbance plate 1105 slides against the bottom inner wall of the storage cylinder 13, and the outer wall of the limiting block 1107 slides against the inner wall of the limiting groove 1106. At the same time, the other end of the disturbance plate 1105 slides against the inner wall of the storage cylinder 13. Thus, through the connection between the limiting block 1107 and the limiting groove 1106, the rotating rod 1101 can synchronously drive multiple sets of disturbance plates 1105 to rotate, so that the material placed in the storage cylinder 13 can move inside the annealing furnace body 1 under the action of the disturbance plates 1105, thereby making the material heat up more evenly inside the annealing furnace body 1.

[0041] Next, flow holes 14 are provided at equal intervals through the inner wall of the storage cylinder 13, so that the heating gas flow can flow into the storage cylinder 13 better through several flow holes 14, ensuring heating and annealing efficiency.

[0042] As described above, during the feeding process, the furnace cover 2 can be positioned by the two positioning rods 4, allowing the storage cylinder 13 to fall smoothly into the interior of the annealing furnace body 1, avoiding friction with the inner wall or heating liner of the annealing furnace body 1. Furthermore, the frustum-shaped top of the positioning rods 4 allows them to be better inserted into the positioning holes 6 during hoisting to complete the material dropping. During the annealing process, the motor 7 drives multiple sets of disturbance plates 1105 to push the material in the storage cylinder 13, allowing the placed material to move inside the annealing furnace body 1, ensuring uniform heating of the material inside the annealing furnace body 1 and guaranteeing the annealing efficiency of the material.

[0043] Example 2:

[0044] Based on the above embodiments, an auxiliary component 15 is provided inside the storage cylinder 13 so that when the disturbance mechanism 11 pushes the material, the auxiliary component 15 controls the storage cylinder 13 to vibrate up and down. The auxiliary component 15 includes a slider 1501 and a guide block 1504, and the bottom of the guide block 1504 is inclined.

[0045] More specifically, in this embodiment, during the annealing process, a groove 1502 is provided through the center of the bottom of the storage cylinder 13, and the outer wall of the groove 1502 slides against the outer wall of the rotating rod 1101. One end of the slider 1501 is fixed to the inner wall of the groove 1502. At the same time, a spiral groove 1503 is provided at equal intervals on the outer wall of the rotating rod 1101 corresponding to the slider 1501, and the outer wall of the slider 1501 slides against the inner wall of the spiral groove 1503. Thus, the storage cylinder 13 can be supported by the slider 1501. Then, guide blocks 1504 are symmetrically fixed to the outer wall of the storage cylinder 13, and the inner wall of the annealing furnace body 1 corresponds to the guide blocks 1504. Block 1504 is symmetrically fixedly connected to limit strips 16, and the two side walls of guide block 1504 slide against the side wall of the two limit strips 16 that are close to each other. Thus, the limit strips 16 can restrict the guide block 1504, preventing the storage cylinder 13 from rotating. When the rotating rod 1101 rotates, the spiral groove 1503 can guide the slider 1501, so that the slider 1501 continuously rises and falls in cycles during the rotation of the rotating rod 1101, thereby synchronously driving the storage cylinder 13 to vibrate up and down. This allows the material placed in the storage cylinder 13 to vibrate and turn over inside the storage cylinder 13, so that all surfaces of the material can be heated.

[0046] Then, during the up-and-down vibration of the storage cylinder 13, the cooperation between the limiting block 1107 and the limiting groove 1106 allows the disturbance plate 1105 to move up and down along with the storage cylinder 13 while being driven by the rotating rod 1101 to move in a circular motion, ensuring that the pushing of the disturbance plate 1105 is not affected.

[0047] Then, during the process of the furnace cover 2 falling, in order to ensure that the guide block 1504 can accurately slide into the two limit strips 16, firstly, since the spiral groove 1503 is connected end to end from top to bottom, under normal conditions, multiple sliders 1501 will be located at the lowest point in the groove of the spiral groove 1503. Therefore, multiple guide blocks 1504 are roughly in a straight line from top to bottom. Furthermore, the bottom of the guide block 1504 is inclined, so that when the guide block 1504 has a slight deviation, it can still accurately slide into the two limit strips 16 under the guidance of the inclined surface, ensuring stability during installation and use.

[0048] As described above, during the annealing process, the storage cylinder 13 can be restricted by two sets of limiting strips 16, allowing it to vibrate up and down under the guidance of the spiral groove 1503. This enables the placed material to vibrate and turn over within the storage cylinder 13, ensuring that all surfaces of the material are heated, thereby improving the annealing effect.

[0049] Working principle: First, the material is placed in the storage cylinder 13. Then, the chain is connected to the lifting lug 18 and the furnace cover 2 is lifted by the crane. Then, multiple storage cylinders 13 are connected to the furnace cover 2 through the rotating rod 1101, so that the material is lifted at the same time when the furnace cover 2 is lifted. Then, the furnace cover 2 is lifted to the furnace opening of the annealing furnace body 1 and prepared for falling.

[0050] During the descent, the movable furnace cover 2 can be controlled to align the top of the positioning hole 6 with the top of the positioning rod 4. The top of the positioning rod 4 is truncated cone-shaped, which allows the positioning rod 4 to be better inserted into the positioning hole 6 during the hoisting process to complete the positioning. Thus, the descent of the furnace cover 2 can be positioned by the two positioning rods 4, so that the storage cylinder 13 can fall smoothly into the interior of the annealing furnace body 1.

[0051] When the bottom of the furnace cover 2 is in contact with the furnace opening of the annealing furnace body 1, the drive gear 9 will mesh with the driven gear 1104. At this time, the furnace cover 2 is connected to the annealing furnace body 1 by bolts and the chain is released. At this time, the heating tubes 17, which are fixedly installed at equal intervals on the inner wall of the annealing furnace body 1, can be used to heat and anneal the material.

[0052] Next, during the processing, the motor 7 is started, which drives the drive gear 9 to rotate. At this time, the drive gear 9 meshes with the driven gear 1104, thereby synchronously driving the driven gear 1104 to rotate. In turn, the rotating rod 1101 synchronously drives multiple sets of disturbance plates 1105 to rotate, so that the material placed in the storage cylinder 13 can move inside the annealing furnace body 1 under the action of the disturbance plates 1105. This makes the material heated more evenly inside the annealing furnace body 1. At the same time, the heating airflow can flow into the storage cylinder 13 better through the flow holes 14 that are equally spaced through the inner wall of the storage cylinder 13.

[0053] Next, during the processing, the storage cylinder 13 is supported by the slider 1501 located in the spiral groove 1503. When the rotating rod 1101 rotates, the guide block 1504 can be restricted by the limiting strip 16, so that the storage cylinder 13 cannot rotate. Then, when the rotating rod 1101 rotates, the slider 1501 can be guided by the spiral groove 1503, so that the slider 1501 continuously rises and falls in cycles during the rotation of the rotating rod 1101, thereby synchronously driving the storage cylinder 13 to vibrate up and down. This allows the material placed in the storage cylinder 13 to vibrate and turn over inside the storage cylinder 13, so that all surfaces of the material can be heated.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pit-type annealing furnace for forging, comprising a furnace body (1) and a furnace cover (2), characterized in that: The outer wall of the annealing furnace body (1) is symmetrically fixedly connected with support blocks (3), and the top of the support blocks (3) is rotatably connected with a positioning rod (4). The outer wall of the furnace cover (2) is fixedly connected with a positioning block (5) corresponding to the furnace cover (2), and the bottom of the positioning block (5) is provided with a positioning hole (6). The top of the positioning rod (4) is frustum-shaped, so as to guide and position the furnace cover (2) during the process of the furnace cover (2) falling. The outer wall of the annealing furnace body (1) is provided with a driving component, the furnace cover (2) is provided with an inner cavity (10), and the inner wall of the inner cavity (10) is provided with a disturbance mechanism (11). The inner wall of the inner cavity (10) is provided with a through groove (12) corresponding to the disturbance mechanism (11). The driving component is driven by the disturbance mechanism (11) so that after the furnace cover (2) falls, the driving component drives the disturbance mechanism (11) to push the material. The disturbance mechanism (11) includes a rotating rod (1101), and storage cylinders (13) are provided at equal intervals on the outer wall of the rotating rod (1101). An auxiliary component (15) is provided inside the storage cylinder (13) so that when the disturbance mechanism (11) pushes the material, the auxiliary component (15) controls the storage cylinder (13) to vibrate up and down. The outer wall of the rotating rod (1101) is provided with disturbance plates (1105) at equal intervals corresponding to the storage cylinder (13); Limiting grooves (1106) are provided at equal intervals on the outer wall of the rotating rod (1101). One end of the disturbance plate (1105) is fixedly connected to a limiting block (1107), and the limiting block (1107) is T-shaped. The outer wall of the limiting block (1107) slides in contact with the inner wall of the limiting groove (1106). The auxiliary component (15) includes a slider (1501), and a groove (1502) is provided through the bottom center of the storage cylinder (13). The outer wall of the groove (1502) slides in contact with the outer wall of the rotating rod (1101), and one end of the slider (1501) is fixed to the inner wall of the groove (1502). The outer wall of the rotating rod (1101) is provided with spiral grooves (1503) at equal intervals corresponding to the slider (1501), and the outer wall of the slider (1501) slides in contact with the inner wall of the spiral groove (1503). The outer wall of the storage cylinder (13) is symmetrically fixedly connected with guide blocks (1504), and the inner wall of the annealing furnace body (1) is symmetrically fixedly connected with limit strips (16) corresponding to the guide blocks (1504).

2. The pit-type annealing furnace for forging according to claim 1, characterized in that, The driving component includes a motor (7), and an installation ring (8) is attached to the outer wall of the motor (7). The two ends of the installation ring (8) are fixedly installed on the outer wall of the annealing furnace body (1). One end of the output shaft of the motor (7) passes through the interior of a certain support block (3) and is fixedly connected to the bottom of the positioning rod (4). The outer wall of the positioning rod (4) is fixedly connected to a driving gear (9). The top of the rotating rod (1101) extends through the bottom of the furnace cover (2) into the interior of the inner cavity (10), and the extended end of the rotating rod (1101) is rotatably connected to the inner wall of the inner cavity (10). The outer wall of the extended end of the rotating rod (1101) is rotatably connected to a transmission belt (1102), and the inner wall of the transmission belt (1102) is rotatably connected to a connecting rod (1103). The outer wall of the connecting rod (1103) is fixedly connected to a driven gear (1104), and the teeth of the driven gear (1104) match the teeth of the driving gear (9).

3. A pit-type annealing furnace for forging according to claim 2, characterized in that, The upper and lower ends of the connecting rod (1103) are rotatably connected to the inner wall of the inner cavity (10), and the bottom of the disturbance plate (1105) slides against the bottom inner wall of the storage cylinder (13).

4. A pit-type annealing furnace for forging according to claim 1, characterized in that, The other end of the disturbance plate (1105) slides against the inner wall of the storage cylinder (13), and the inner wall of the storage cylinder (13) is provided with flow holes (14) at equal intervals.

5. A pit-type annealing furnace for forging according to claim 1, characterized in that, The two side walls of the guide block (1504) slide in contact with the side wall of the two limiting strips (16) and the bottom of the guide block (1504) is inclined.

6. A pit-type annealing furnace for forging according to claim 1, characterized in that, Heating tubes (17) are fixedly installed at equal intervals on the inner wall of the annealing furnace body (1), and lifting lugs (18) are fixedly installed on the top of the furnace cover (2); The bottom of the annealing furnace body (1) is fixedly equipped with support legs (19) at equal intervals, and the support legs (19) are provided with fixing nails (20).

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