A mobile tool for pit furnaces

Abstract

The utility model belongs to the technical field of industrial heat treatment equipment relates to a kind of mobile tool of shaft furnace, including material frame and lifting appliance, the material frame content is equipped with the workpiece to be normalized or quenched, further include at least one suspender, the lower end of the suspender is connected with the bottom of the material frame, and the upper end is provided with lifting head portion;Lifting head portion is provided with the pin hole that passes through horizontally, the axis direction of the pin hole is perpendicular to the axial direction of suspender, a cross pin is installed in the pin hole, and the both ends of the cross pin are exposed outside the both sides of lifting head portion, form the hanging part for being connected with the lifting appliance of suspension;When the material frame is placed in the hearth of shaft furnace, the hanging part of the cross pin is located at the safe operating height above the upper edge of hearth.The mobile tool of shaft furnace provided by the utility model can improve the operation safety and convenience.

Description

Technical Field

[0001] This utility model belongs to the technical field of industrial heat treatment equipment, and relates to a mobile tooling for a pit furnace. Background Technology

[0002] Pit furnaces are widely used in heat treatment processes such as normalizing and quenching of metal parts. Traditional pit furnace unloading methods typically require operators to be close to the furnace hearth for hoisting operations, which presents problems such as high-temperature radiation, inconvenience in operation, and significant safety hazards. Especially when the hoisting equipment is connected to the material frame, operators must work at close range, making them highly susceptible to burns from the high temperatures.

[0003] To address the operational safety issues in high-temperature environments, several improvements have been implemented in existing technologies. For example, Chinese invention patent CN103145028A discloses a "well-type furnace lifting device" that employs a design that allows the lifting rod to be separated from the base supporting the workpiece. This design allows the lifting rod to be removed from the furnace after the workpiece is placed inside, preventing it from participating in the entire heating process. This aims to solve the problem of the lifting rod easily becoming necked and breaking due to repeated heating, thereby indirectly improving operational safety.

[0004] However, the core purpose of this solution is to protect the lifting equipment and extend its service life, while providing indirect and incomplete safety protection for operators. Therefore, there is an urgent need in the field for a movable tooling for pit furnaces that can prevent operators from suffering high-temperature burns due to close-range operation. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a mobile tooling for a pit furnace, which can improve operational safety and convenience.

[0006] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A movable fixture for a pit furnace includes a material frame and a lifting device. The material frame contains workpieces to be normalized or quenched. It also includes at least one lifting rod, the lower end of which is connected to the bottom of the material frame, and the upper end of which has a lifting head. The lifting head has a transversely penetrating pin hole, the axis of which is perpendicular to the axis of the lifting rod. A horizontal pin is installed in the pin hole, with both ends of the horizontal pin exposed outside the sides of the lifting head, forming a suspended hanging part for connection with the lifting device. When the material frame is placed inside the hearth of the pit furnace, the hanging part of the horizontal pin is located at a safe operating height above the upper edge of the hearth.

[0007] In the aforementioned movable tooling for a pit furnace, the safe operating height refers to the height at which the operator can directly observe and operate the connection between the lifting device and the cross pin from a position away from the furnace hearth during hoisting.

[0008] In the aforementioned movable fixture for a pit furnace, the lifting rod is configured as a single rod with its axis collinear with the axis of the material frame; furthermore, a radial connecting plate can be provided between the lifting rod and the material frame.

[0009] In the aforementioned movable fixture for a pit furnace, the lifting rod is detachably connected to the material frame.

[0010] In the aforementioned movable fixture for a pit furnace, a mounting base is provided at the bottom of the material frame, a mounting through hole is provided on the side wall of the mounting base, a corresponding radial through hole is provided on the lifting rod, the lower end of the lifting rod is inserted into the mounting base, and a fastener passes through the mounting through hole and the radial through hole and is screwed with a locking nut.

[0011] In the aforementioned movable fixture for a pit furnace, the horizontal pin is provided with an integrally formed annular shoulder and a radial locking hole. The cotter pins in the annular shoulder and the radial locking hole respectively abut against the side walls of the lifting rod to form an axial fixing structure for the horizontal pin. Other fixing structures can also be used for the horizontal pin and the lifting rod, such as machining external threads on the horizontal pin and using a lock nut. Of course, the horizontal pin and the lifting rod can also be an integral structure.

[0012] In the aforementioned movable fixture for a pit furnace, the outer edge of the pit furnace is provided with a guardrail that extends above the ground, and the hanging part of the horizontal pin is located at a safe operating height above the upper edge of the guardrail.

[0013] This utility model can be adapted to various lifting devices, such as: In the aforementioned mobile tooling for a pit furnace, the lifting device is a forklift fork, the effective bearing length of the hanging parts on both sides of the cross pin is greater than the width of the fork, and the upper surface of the fork forms a support structure for the bottom of the cross pin.

[0014] In the aforementioned movable tooling for a pit furnace, the lifting device is a hook on a crane or gantry crane. The opening width of the hook is greater than the diameter of the cross pin. A pair of hooks are provided, each adapted to the hanging part on both sides of the cross pin.

[0015] In the aforementioned movable fixture for a pit furnace, the material frame, lifting rod, and cross pin are all made of metal, such as cast iron.

[0016] Compared with the prior art, this utility model has the following advantages: This utility model provides a mobile fixture for a pit furnace. By extending the lifting rod and ensuring that its upper horizontal pin suspension part is always positioned at a safe height above the upper edge of the furnace hearth, operators can stand completely on the ground in a safe position when connecting or disconnecting the lifting device, without having to bend over or approach the high-temperature furnace opening. This completely avoids the risks of high-temperature heat radiation and potential burns, ensuring personal safety. The fixture has a clever and reasonable structural design. The connection between the lifting rod and the material frame is stable, and the suspended suspension part of the horizontal pin allows the lifting device to be quickly and directly attached or supported. The operation process is intuitive and simple, greatly reducing labor intensity and operational difficulty, and improving lifting efficiency. In addition, the overall structure is robust and reliable, suitable for various heat treatment conditions such as normalizing and quenching, and has good versatility and practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Reference numerals: 1. Material frame; 2. Workpiece; 3. Lifting rod; 4. Lifting head; 5. Pin hole; 6. Horizontal pin; 7. Hanging part; 8. Pit furnace; 9. Hearth; 10. Mounting base; 11. Mounting through hole; 12. Radial through hole; 13. Fastener; 14. Locking nut; 15. Annular shoulder; 16. Radial locking hole; 17. Cotter pin; 18. Guardrail. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1 : A movable fixture for a pit furnace 8 includes a material frame 1 and a lifting device. The material frame 1 contains workpieces 2 (parts or molds) to be normalized or quenched. It also includes at least one lifting rod 3. The lower end of the lifting rod 3 is connected to the bottom of the material frame 1, and the upper end is provided with a lifting head 4. The lifting head 4 is provided with a transversely penetrating pin hole 5. The axis of the pin hole 5 is perpendicular to the axis of the lifting rod 3. A horizontal pin 6 is installed in the pin hole 5, and both ends of the horizontal pin 6 are exposed outside the sides of the lifting head 4, forming a suspended hanging part 7 for connecting with the lifting device. When the material frame 1 is placed in the hearth 9 of the pit furnace 8, the hanging part 7 of the horizontal pin 6 is located at a safe operating height above the upper edge of the hearth 9. During hoisting, the operator can directly observe and operate the connection between the lifting device and the horizontal pin 6 from a position away from the hearth 9 at a ground level.

[0019] This embodiment can be adapted to various lifting devices, taking a forklift as an example: During the furnace loading stage, the operator first loads the parts or molds to be processed into the material frame 1, then hoists the entire material frame 1, connected to the extended lifting rod 3, above the furnace opening of the pit furnace 8 and slowly lowers it. As the material frame 1 sinks, the horizontal pin 6 at the top of the lifting rod 3, with its hanging part 7, remains at a predetermined safe height above the upper edge of the furnace hearth 9. After the heat treatment process is completed, the operator drives a forklift close to the pit furnace 8. From a distance of several meters from the furnace opening, the forks can be directly manipulated to smoothly insert them under the hanging parts 7 on both sides of the horizontal pin 6. Once it is confirmed that the forks have fully supported the horizontal pin 6, the forklift can be started to lift the parts. As the forks rise, the lifting rod 3 pulls the material frame 1 and its contents smoothly and vertically out of the furnace hearth 9, completing the entire unloading process. Throughout the connection and lifting process, the operator does not need to approach the high-temperature furnace opening, achieving safe operation from a distance.

[0020] In this embodiment, the lifting rod 3 is a single rod with its axis collinear with the axis of the material frame 1. The coaxial lifting rod 3 can stably lift the material frame 1 while ensuring that there is enough space in the material frame 1 to accommodate parts or molds. Furthermore, a radial connecting plate can be provided between the lifting rod 3 and the material frame 1.

[0021] Preferably, the lifting rod 3 is detachably connected to the material frame 1. The detachable connection structure can improve the flexibility and replaceability of the tooling.

[0022] In this embodiment, the specific fixing structure of the material frame 1 and the mounting base 10 is as follows: the bottom of the material frame 1 is provided with a mounting base 10, the side wall of the mounting base 10 is provided with a mounting through hole 11, the lifting rod 3 is provided with a corresponding radial through hole 12, the lower end of the lifting rod 3 is inserted into the mounting base 10, and a fastener 13 passes through the mounting through hole 11 and the radial through hole 12 and is screwed with a locking nut 14.

[0023] In this embodiment, the specific connection structure between the horizontal pin 6 and the lifting rod 3 is as follows: the horizontal pin 6 is provided with an integrally formed annular shoulder 15 and a radial locking hole 16. The cotter pins 17 in the annular shoulder 15 and the radial locking hole 16 respectively abut against the two side walls of the lifting rod 3 to form an axial fixing structure for the horizontal pin 6. Other fixing structures can also be used for the horizontal pin 6 and the lifting rod 3, such as machining external threads on the horizontal pin 6 and using a lock nut. Of course, the horizontal pin 6 and the lifting rod 3 can also use an integral structure.

[0024] Furthermore, the outer edge of the pit furnace 8 is provided with a guardrail 18 that is higher than the ground, and the hanging part 7 of the horizontal pin 6 is located at a safe operating height above the upper edge of the guardrail 18.

[0025] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A movable fixture for a pit furnace, comprising a material frame (1) and a lifting device, wherein the material frame (1) contains a workpiece (2) to be normalized or quenched, characterized in that, It also includes at least one lifting rod (3), the lower end of which is connected to the bottom of the material frame (1), and the upper end is provided with a lifting head (4); the lifting head (4) is provided with a horizontally penetrating pin hole (5), the axial direction of the pin hole (5) is perpendicular to the axial direction of the lifting rod (3), a horizontal pin (6) is installed in the pin hole (5), and the two ends of the horizontal pin (6) are exposed outside the two sides of the lifting head (4), forming a suspended hanging part (7) for connecting with the lifting device; when the material frame (1) is placed in the hearth (9) of the pit furnace (8), the hanging part (7) of the horizontal pin (6) is located at a safe operating height above the upper edge of the hearth (9).

2. The movable tooling for a pit furnace according to claim 1, characterized in that, The lifting rod (3) is set as one, and its axis is collinear with the axis of the material frame (1).

3. The movable tooling for a pit furnace according to claim 2, characterized in that, The boom (3) is detachably connected to the material frame (1).

4. The movable tooling for a pit furnace according to claim 3, characterized in that, The bottom of the material frame (1) is provided with a mounting base (10), the side wall of the mounting base (10) is provided with a mounting through hole (11), the lifting rod (3) is provided with a corresponding radial through hole (12), the lower end of the lifting rod (3) is inserted into the mounting base (10), and a fastener (13) passes through the mounting through hole (11) and the radial through hole (12) and then screws a locking nut (14).

5. The movable tooling for a pit furnace according to claim 1, characterized in that, The horizontal pin (6) is provided with an integrally formed annular shoulder (15) and a radial locking hole (16). The cotter pins (17) in the annular shoulder (15) and the radial locking hole (16) respectively abut against the two side walls of the rod (3) to form an axial fixing structure of the horizontal pin (6).

6. The movable tooling for a pit furnace according to claim 1, characterized in that, The outer edge of the well furnace (8) is provided with a guardrail (18) that is higher than the ground, and the hanging part (7) of the horizontal pin (6) is located at a safe operating height above the upper edge of the guardrail (18).

7. The movable tooling for a pit furnace according to claim 1, characterized in that, The lifting device is a forklift fork. The effective bearing length of the hanging parts (7) on both sides of the cross pin (6) is greater than the width of the fork. The upper surface of the fork forms a support structure for the bottom of the cross pin (6).

8. The movable tooling for a pit furnace according to claim 1, characterized in that, The lifting device is a hook on a crane or gantry crane. The opening width of the hook is greater than the diameter of the horizontal pin (6). The hook is provided in pairs and is adapted to the hanging parts (7) on both sides of the horizontal pin (6).

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