Pit furnace for machining long cold-rolled seamless tube core rod piece
By introducing a baffle clamping mechanism and clamping structure into the pit furnace, the problems of unstable hoisting and low furnace entry efficiency of cold-rolled seamless tube mandrels have been solved, achieving precise vertical entry of mandrels into the furnace and efficient production, while reducing surface damage and production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU CHANGXINSHUNLI METAL PROD CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-15
AI Technical Summary
When hoisting long cold-rolled seamless tube mandrels in existing pit furnaces, the mandrels are long and heavy, which makes the hoisting unstable, difficult to accurately and vertically enter the furnace inlet, and prone to collision with the inner wall, causing surface damage. In addition, the furnace loading efficiency is low, which affects production efficiency and cost.
A pit furnace including a stop clamping mechanism and a clamping structure was designed. The motor drives the lead screw and lifting block to drive the stop clamp and limit clamp, realizing dynamic blocking and circumferential constraint on the mandrel, ensuring that the mandrel enters the furnace vertically and avoids collision. The buffer pad and sliding plate reduce friction damage.
It significantly improves the accuracy and efficiency of mandrel feeding into the furnace, reduces the surface scratch rate, enhances product quality and production efficiency, reduces human intervention, and lowers production costs.
Smart Images
Figure CN224243154U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of seamless tube processing equipment, and in particular to a pit furnace for processing long cold-rolled seamless tube mandrels. Background Technology
[0002] In the production process of cold-rolled seamless tubes, the mandrel is an important processing tool, and its performance plays a key role in the quality of the seamless tube. The pit furnace is a commonly used equipment for heat treatment and other processing of long mandrel pieces of cold-rolled seamless tubes.
[0003] However, in actual production use, existing pit furnaces suffer from several drawbacks. When hoisting long cold-rolled seamless tube mandrels to the pit furnace inlet using a crane, the mandrels, due to their length and weight, inevitably sway during hoisting. This results in instability when positioned above the pit furnace inlet, making it difficult for the mandrels to enter the furnace accurately and vertically during descent. Furthermore, the mandrels are prone to colliding with the furnace wall upon placement, causing surface damage and affecting their quality and subsequent performance. In addition, the efficiency of placing cold-rolled seamless tube mandrels into the pit furnace is not only low but also requires manual adjustment of the mandrel's descent position to ensure smooth entry, severely impacting production efficiency and increasing production costs.
[0004] To address this, a pit furnace is proposed for processing long cold-rolled seamless mandrels. Utility Model Content
[0005] The purpose of this invention is to provide a pit furnace for processing long cold-rolled seamless tube mandrels. This invention addresses the problems of existing pit furnaces in actual production. When hoisting long cold-rolled seamless tube mandrels to the pit furnace inlet using a crane, the mandrels, due to their length and mass, inevitably sway during hoisting, resulting in instability above the furnace inlet. Consequently, it is difficult for the mandrels to enter the furnace accurately and vertically during descent, and they are prone to colliding with the furnace wall upon placement, causing surface damage and affecting mandrel quality and subsequent performance. Furthermore, the efficiency of entering the pit furnace with cold-rolled seamless tube mandrels is low, and manual adjustment of the mandrel's descent position is required to ensure smooth entry, severely impacting production efficiency and increasing production costs.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a pit furnace for processing long cold-rolled seamless tube mandrels, comprising a furnace body, a furnace cover provided on the rear side of the top of the furnace body, a controller provided on the front side of the furnace body, and a stop auxiliary clamping mechanism provided on both sides of the furnace body.
[0007] The gear shifting auxiliary clamping mechanism includes motors bolted to both sides of the furnace body. The motors are electrically connected to the controller. A lead screw is fixedly connected to the output end of the motor. Sliding sleeves are welded to both sides of the furnace body. A lifting block is threaded to the outer side of the lead screw. The lifting block is slidably connected inside the sliding sleeve. A first arc plate is bolted to the top of the left lifting block. A first electric push rod is bolted to the left side of the first arc plate. The first electric push rod is electrically connected to the controller. The telescopic end of the first electric push rod passes through the outer side of the first arc plate. A gear shifting clamp is fixedly connected to the telescopic end of the first electric push rod. The gear shifting clamp is located on the left side of the furnace body. An auxiliary clamping structure is provided on the top of the right lifting block.
[0008] Preferably, the auxiliary clamping structure includes a second arc plate bolted to the top of the right-side lifting block, a second electric push rod bolted to the right side of the second arc plate, the second electric push rod being electrically connected to the controller, and the telescopic end of the second electric push rod passing through the right side of the second arc plate.
[0009] Preferably, the telescopic end of the second electric push rod is fixedly connected to a limit clamp, which is located on the right side of the furnace body.
[0010] Preferably, auxiliary rods are welded to both the front and rear sides of the right side of the limiting clamp, and the right side of the auxiliary rods penetrates the inner side of the second arc plate.
[0011] Preferably, a buffer pad is adhered to the inner side of both the stop clamp and the limit clamp, and the buffer pad is made of elastic material.
[0012] Preferably, a slider is bonded to the inner side of the buffer pad, and the slider is made of a nickel-based alloy.
[0013] Preferably, guide rods are welded to both the front and rear sides of the left side of the gear shift clamp, and the left side of the guide rods penetrates the inner side of the first arc plate.
[0014] Preferably, the inner side of the slider is coated with an HVOF tungsten carbide coating, which has smooth properties.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1. This application sets up a stop clamping mechanism. After the furnace cover is opened, the controller synchronously starts the left motor drive screw, which drives the lifting block inside the sliding sleeve and the top first arc plate to rise to the preset height. At this time, the first electric push rod pushes the stop clamp to move laterally to the standby position on the left side of the furnace inlet. When the crane hoists the cold-rolled seamless tube mandrel above the furnace opening, the stop clamp immediately performs dynamic blocking on the swinging cold-rolled seamless tube mandrel, controls the swing amplitude of the cold-rolled seamless tube mandrel, and ensures its verticality. This process completes the initial stabilization, laying the foundation for subsequent accurate entry into the furnace.
[0017] 2. This application, by setting up an auxiliary clamping structure, after the stop clamp completes the initial positioning, the right-side motor synchronously drives the auxiliary clamping structure to rise to the same height as the stop clamp. Through the diameter matching program preset by the controller, the auxiliary clamping structure quickly moves to the right side of the cold-rolled seamless tube mandrel to form a circumferential constraint. During the descent of the cold-rolled seamless tube mandrel, the auxiliary clamping structure and the stop clamp work together to form a dynamic guide channel, ensuring that the descent trajectory of the cold-rolled seamless tube mandrel is always located on the central axis of the furnace body, completely avoiding collision with the inner wall. This greatly reduces the surface scratch rate of the cold-rolled seamless tube mandrel, eliminates the need for manual adjustment of the mandrel's descent position, and shortens the time for a single cold-rolled seamless tube mandrel to enter the furnace body, significantly improving product quality and production efficiency. Attached Figure Description
[0018] Figure 1 This is an overall structural diagram of the pit furnace used for processing long cold-rolled seamless tube mandrels according to this utility model.
[0019] Figure 2 This is a structural diagram of the furnace body of this utility model;
[0020] Figure 3 This is a structural diagram of the gear shift auxiliary clamping mechanism of this utility model;
[0021] Figure 4 This is a structural diagram of the auxiliary clamp structure of this utility model;
[0022] Figure 5 This is a structural diagram of the limiting clamp of this utility model.
[0023] In the diagram, 1. Furnace body; 2. Furnace cover; 3. Controller; 4. Gear clamping mechanism; 41. Motor; 42. Lead screw; 43. Sliding sleeve; 44. Lifting block; 45. First arc plate; 46. First electric push rod; 47. Gear clamp; 48. Auxiliary clamping structure; 481. Second arc plate; 482. Second electric push rod; 483. Limit clamp; 484. Auxiliary rod; 5. Buffer pad; 6. Sliding plate; 7. Guide rod. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figure 1-5 The present invention provides the following technical solution:
[0026] A pit furnace for processing long cold-rolled seamless tube mandrels includes a furnace body 1, a furnace cover 2 is provided on the rear side of the top of the furnace body 1, a controller 3 is provided on the front side of the furnace body 1, and a stop auxiliary clamping mechanism 4 is provided on both sides of the furnace body 1.
[0027] The gear shifting auxiliary clamping mechanism 4 includes a motor 41 bolted to both sides of the furnace body 1. The motor 41 is electrically connected to the control unit. The output end of the motor 41 is fixedly connected to a lead screw 42. Sliding sleeves 43 are welded to both sides of the furnace body 1. A lifting block 44 is threaded to the outer side of the lead screw 42. The lifting block 44 is slidably connected inside the sliding sleeve 43. A first arc plate 45 is bolted to the top of the left lifting block 44. A first electric push rod 46 is bolted to the left side of the first arc plate 45. The first electric push rod 46 is electrically connected to the controller 3. The telescopic end of the first electric push rod 46 passes through the outer side of the first arc plate 45. A gear shifting clamp 47 is fixedly connected to the telescopic end of the first electric push rod 46. The gear shifting clamp 47 is located on the left side of the furnace body 1. An auxiliary clamping structure 48 is provided on the top of the right lifting block 44.
[0028] In this embodiment: by setting up a stop clamp mechanism 4, when the furnace cover 2 is opened, the controller 3 first starts the left motor 41 to drive the lead screw 42 to rotate, which drives the left lifting block 44 to rise vertically along the sliding sleeve 43 to a preset height. At this time, the first electric push rod 46 pushes the stop clamp 47 to quickly extend to the left standby position of the furnace opening. When the crane lifts the cold-rolled seamless tube mandrel above the furnace body 1, it contacts the stop clamp 47, thereby achieving initial interception of the mandrel and suppressing its swing amplitude. The stop clamp 47 completes the initial interception. After positioning, the right motor 41 synchronously drives the auxiliary clamping structure 48 to rise to the same horizontal plane. The controller 3 drives the auxiliary clamping structure 48 to move towards its position of the cold-rolled seamless tube mandrel. It works with the stop clamp 47 to close and form a circumferential constraint. Then, during the lowering process of the cold-rolled seamless tube mandrel, the descent trajectory of the cold-rolled seamless tube mandrel is always located on the central axis of the furnace body 1, realizing non-contact entry into the furnace body 1 throughout the process. This greatly reduces the surface scratch rate of the cold-rolled seamless tube mandrel and shortens the time for the mandrel to enter the furnace body 1, significantly improving product quality and production efficiency.
[0029] Specifically, such as Figure 4 As shown, the auxiliary clamping structure 48 includes a second arc plate 481 bolted to the top of the right lifting block 44. A second electric push rod 482 is bolted to the right side of the second arc plate 481. The second electric push rod 482 is electrically connected to the controller 3. The telescopic end of the second electric push rod 482 passes through the right side of the second arc plate 481.
[0030] Specifically, such as Figure 4 As shown, the telescopic end of the second electric push rod 482 is fixedly connected to a limit clamp 483, which is located on the right side of the furnace body 1.
[0031] Specifically, such as Figure 4As shown, auxiliary rods 484 are welded to both the front and rear sides of the right side of the limiting clamp 483, and the right side of the auxiliary rods 484 penetrates the inner side of the second arc plate 481.
[0032] In this embodiment: by setting the auxiliary clamp structure 48, after the stop clamp 47 completes the initial blocking and positioning, the controller 3 starts the right motor 41 to drive the lead screw 42 to rotate, which drives the right lifting block 44 to rise along the sliding sleeve 43 to the same height as the stop clamp 47. At this time, the second electric push rod 482 pushes the limit clamp 483 to extend quickly. The precise sliding cooperation between the auxiliary rod 484 and the second arc plate 481 ensures the accuracy of linear motion. The limit clamp 483 and the stop clamp 47 form a ring constraint, so that the mandrel descent trajectory is always aligned with the central axis of the furnace body 1 with high precision, effectively avoiding the collision between the mandrel and the inner wall of the furnace body 1.
[0033] Specifically, such as Figure 5 As shown, buffer pads 5 are bonded to the inner sides of both the gear clamp 47 and the limit clamp 483. The buffer pads 5 are made of elastic material.
[0034] Specifically, such as Figure 5 As shown, a slider 6 is bonded to the inner side of the buffer pad 5. The slider 6 is made of nickel-based alloy.
[0035] In this embodiment: by setting buffer pad 5 and sliding plate 6, when the stop clamp 47 and limit clamp 483 form a circumferential constraint on the mandrel, the buffer pad 5 made of elastic material first contacts the surface of the mandrel, and absorbs the impact energy generated during the hoisting process through elastic deformation, avoiding surface scratches caused by rigid contact. The nickel-based alloy sliding plate 6 is bonded to the inner side of the buffer pad 5, providing stable friction while its smooth surface performance effectively reduces the sliding friction coefficient with the mandrel, allowing the mandrel to pass smoothly through the clamping area during descent, further reducing the risk of surface damage caused by friction.
[0036] Specifically, such as Figure 3 As shown, guide rods 7 are welded to both the front and rear sides of the left side of the gear clamp 47, and the left side of the guide rods 7 penetrates the inner side of the first arc plate 45.
[0037] Specifically, such as Figure 5 As shown, the inner side of the slider 6 is coated with an HVOF tungsten carbide coating, which has smooth properties.
[0038] In this embodiment: by setting guide rod 7, the guide rod 7 and the first arc plate 45 are precisely fitted to form a rigid auxiliary guide, ensuring the repeatability of the positioning accuracy of the lateral movement of the stop clamp 47. The HVOF tungsten carbide coating sprayed on the inner side of the slide plate 6 forms a self-lubricating protective film on the surface of the mandrel, which can significantly reduce the coefficient of friction. Moreover, due to its excellent high temperature resistance and wear resistance, it ensures that there is no peeling during long-term use, effectively extending the service life of the components and improving the overall reliability of the equipment.
[0039] Working Principle: In the process of using a pit furnace for processing long cold-rolled seamless tube mandrels, when the mandrel needs to be hoisted into the pit furnace, the furnace cover 2 is first opened by the controller 3. Then, the controller 3 automatically starts the left motor 41 to drive the lead screw 42 to rotate, which drives the lifting block 44 to rise along the sliding sleeve 43 to the preset height. The first electric push rod 46 pushes the stop clamp 47 to quickly extend to the left standby position of the furnace body 1 entrance. When the crane hoists the mandrel above the furnace body 1 entrance, the swinging mandrel contacts the stop clamp 47, achieving initial interception and suppressing the swing amplitude. At the same time, the right motor 41 synchronously drives the auxiliary clamp structure 48 to rise to the same height as the stop clamp 47. The second electric push rod 482 pushes the limit clamp 483 to extend. Through the precise sliding cooperation between the auxiliary rod 484 and the second arc plate 481, the linear motion accuracy of the limit clamp 483 is ensured. When the mandrel 83 and the stop clamp 47 form a ring constraint, the double-sided buffer pads 5 provide uniform radial pressure. Together with the rigid guide pair formed by the guide rod 7 and the first arc plate 45, the mandrel descent trajectory is always aligned with the central axis of the furnace body 1 with high precision. During the mandrel descent, the HVOF tungsten carbide coating on the inner side of the nickel-based alloy slide 6 forms a self-lubricating protective film, reducing the sliding friction coefficient and allowing the mandrel to pass smoothly through the clamping area. The elastic buffer pad 5 absorbs more than 90% of the impact energy, avoiding surface scratches caused by rigid contact. The entire process is automatically completed by the controller 3 through a preset program. It only takes a few minutes from the start of interception to the complete entry of the mandrel into the furnace, which can improve efficiency by more than 70% compared with the traditional method. Then the stop clamp 47 and the limit clamp 483 are released, and the motor 41 drives the lifting block 44 and other structures to descend and reset. The furnace cover 2 is then closed for heat treatment.
[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A pit furnace for processing cold-rolled seamless mandrel long parts, comprising a furnace body (1), characterized in that: A furnace cover (2) is provided on the rear side of the top of the furnace body (1), a controller (3) is provided on the front side of the furnace body (1), and a gear clamping mechanism (4) is provided on both sides of the furnace body (1). The gear shift auxiliary clamp mechanism (4) includes a motor (41) bolted to both sides of the furnace body (1). The motor (41) is electrically connected to the controller. The output end of the motor (41) is fixedly connected to a lead screw (42). Sliding sleeves (43) are welded to both sides of the furnace body (1). A lifting block (44) is threaded to the outside of the lead screw (42). The lifting block (44) is slidably connected to the inside of the sliding sleeve (43). A first arc plate (45) is bolted to the top of the left lifting block (44). A first electric push rod (46) is bolted to the left side of the first arc plate (45). The first electric push rod (46) is electrically connected to the controller (3). The telescopic end of the first electric push rod (46) passes through the outside of the first arc plate (45). A gear shift clamp (47) is fixedly connected to the telescopic end of the first electric push rod (46). The gear shift clamp (47) is located on the left side of the furnace body (1). An auxiliary clamp structure (48) is provided on the top of the right lifting block (44).
2. A pit furnace for processing long cold-rolled seamless mandrels according to claim 1, characterized in that: The auxiliary clamping structure (48) includes a second arc plate (481) bolted to the top of the right lifting block (44), a second electric push rod (482) bolted to the right side of the second arc plate (481), the second electric push rod (482) being electrically connected to the controller (3), and the telescopic end of the second electric push rod (482) penetrating through the right side of the second arc plate (481).
3. A pit furnace for processing long cold-rolled seamless mandrels according to claim 2, characterized in that: The telescopic end of the second electric push rod (482) is fixedly connected to a limiting clamp (483), which is located on the right side of the furnace body (1).
4. A pit furnace for processing long cold-rolled seamless mandrels according to claim 3, characterized in that: The front and rear sides of the right side of the limiting clamp (483) are both welded with auxiliary rods (484), and the right side of the auxiliary rods (484) penetrates the inner side of the second arc plate (481).
5. A pit furnace for processing long cold-rolled seamless mandrels according to claim 1, characterized in that: Both the inner sides of the stop clamp (47) and the limit clamp (483) are bonded with buffer pads (5), which are made of elastic material.
6. A pit furnace for processing long cold-rolled seamless mandrels according to claim 5, characterized in that: The inner side of the buffer pad (5) is bonded with a slider (6), which is made of nickel-based alloy.
7. A pit furnace for processing long cold-rolled seamless mandrels according to claim 1, characterized in that: The front and rear sides of the left side of the gear clamp (47) are both welded with guide rods (7), and the left side of the guide rods (7) penetrates the inner side of the first arc plate (45).
8. A pit furnace for processing long cold-rolled seamless mandrels according to claim 6, characterized in that: The inner side of the slider (6) is coated with an HVOF tungsten carbide coating, which has smooth properties.