A large-tonnage vacuum furnace and a translation and lifting system and a hydraulic locking device of a furnace door thereof

Abstract

The utility model discloses a big tonnage vacuum furnace and hydraulic locking device of its furnace door's translation promotion system and, including furnace door, left and right stand, promotion support, drive mechanism, chain transmission and translation mechanism, install guide pulley, limit wheel and translation wheel on the furnace door, promotion support installs at the top of furnace body, drive mechanism installs on promotion support to be connected chain transmission through transmission shaft, chain transmission is connected with the furnace door, left and right stand installs at both sides of furnace body, translation mechanism installs on left and right stand to drive furnace door to move horizontally. This translation promotion system ensures to satisfy the engineering use requirement, can effectively solve the problem that the uneven force of big tonnage hinge type furnace door leads to the structural deformation, the problem that the staff is difficult to open and the problem that the space is occupied when opening is relatively big.

Description

Technical Field

[0001] This utility model belongs to the technical field of industrial kilns for heat treatment, specifically relating to a large-tonnage vacuum furnace and its furnace door translation and lifting system and hydraulic locking device. Background Technology

[0002] The furnace door is a crucial component of a vacuum annealing furnace, and its performance directly affects product quality. Currently, due to the vacuum locking mechanism, most vacuum furnaces adopt a horizontal hinged side-opening door structure. This structure is more suitable for small and medium-sized heat treatment vacuum furnaces, but it requires manual operation by staff to open and close the door.

[0003] For large vacuum furnaces, the heavy weight (over 7.5 tons) and large dimensions (over 4.5 meters wide and 4.5 meters high) of the furnace doors make them difficult for workers to move, and the side-opening structure occupies a lot of space, resulting in wasted space. Furthermore, due to the weight and size of the furnace doors, the use of a hinged structure makes them prone to sagging due to their weight, and there are difficulties in aligning and sealing them during closing, posing a risk of leakage, especially for heat treatment vacuum furnaces with specific atmosphere requirements.

[0004] The sealing of the furnace door mainly refers to the seal between the furnace door and the furnace body. Currently, vacuum furnaces face the risk of short service life of sealing elements and escape of high-temperature gas during high-temperature sintering. A new sealing structure needs to be designed for high-temperature vacuum furnaces to ensure the reliability of the furnace door seal. Utility Model Content

[0005] This utility model provides a large-tonnage vacuum furnace and its furnace door translation and lifting system and hydraulic locking device, which aims to realize the horizontal movement, vertical lifting and vacuum locking of the furnace door, improve the safety and service life of the equipment and reduce energy consumption.

[0006] This utility model provides a horizontal lifting system for a large-tonnage vacuum furnace door, including a furnace door, a left column, a right column, a lifting bracket, a drive mechanism, a chain drive device, and a horizontal movement mechanism. The furnace door is equipped with guide wheels, limit wheels, and horizontal movement wheels. The lifting bracket is installed on the top of the furnace body. The drive mechanism is installed on the lifting bracket and connected to the chain drive device via a drive shaft. The chain drive device is connected to the furnace door. The left column and the right column are installed on both sides of the furnace body. The horizontal movement mechanism is installed on the left column and the right column to drive the furnace door to move horizontally.

[0007] As a further preferred embodiment of this utility model, the translation mechanism includes a cylinder seat, a cylinder, a translation groove, a guide shaft, a guide seat, and a shaft support. When the furnace door is in the lower position, the translation wheel is located in the translation groove. The translation groove can be driven by the cylinder to perform horizontal reciprocating motion, thereby driving the furnace door to move horizontally.

[0008] Furthermore, the drive mechanism includes a motor, a reducer, and a transmission shaft. The chain drive device includes a main shaft, sprocket one, sprocket two, a chain, and a guide sprocket assembly. The furnace door is mounted on a closed-loop chain. A dual-output shaft reducer is mounted on the lifting bracket. Both ends of the dual-output shaft reducer are connected to one end of the drive shaft via universal couplings to achieve synchronous rotation of the main shaft. Both ends of the drive shaft are mounted on seated spherical roller bearings. The seated spherical roller bearings are fixed to the lifting bracket with bolts. Sprocket one is mounted in the middle of the drive shaft. The chain achieves closed-loop motion through sprocket one, sprocket two, and the guide sprocket assembly, thereby driving the furnace door to rise and fall.

[0009] This utility model also provides a hydraulic locking device for a large-tonnage vacuum furnace door, characterized in that it includes a locking slider, a pressure block, a wedge block, a hydraulic cylinder, and a retaining wheel assembly. The wedge block is welded to the four sides of the furnace door. The locking slider and the hydraulic cylinder are connected by a pin. The pressure block is installed on the upper surface of the locking slider and connected to the furnace door by bolts. The hydraulic locking device can drive the locking slider to move by the extension and retraction of the hydraulic cylinder. The locking slider is provided with an inclined surface opposite to the direction of the wedge block. By cooperating with the movement of the wedge block, the locking and unlocking actions of the furnace door are realized.

[0010] As a further preferred embodiment of this utility model, the locking slider slides along the guide structure on the furnace body under the drive of the hydraulic cylinder, and cooperates with the wedge block to lock and unlock the furnace door.

[0011] Furthermore, the hydraulic locking device also includes a sealing structure, which adopts a triple sealing method, including fiber rope, graphite packing, and silicone rubber sealing ring. The silicone rubber sealing ring is installed in the sealing groove of the furnace door flange. When the furnace door is locked, the furnace door flange fits against the furnace body flange and compresses the silicone rubber sealing ring to form the first seal. Furnace door refractory material is riveted inside the furnace door, and furnace body refractory material is riveted inside the furnace body. The refractory material covers a protective steel plate, and a sealing groove is provided on the protective steel plate. Graphite packing is installed at the lower part of the groove, forming a second seal with the contact surface of the furnace door refractory material. Fiber rope is installed at the upper part, forming a third seal with the corner of the furnace door refractory material.

[0012] As a further preferred embodiment of this utility model, the fiber rope has the characteristics of low density, good elasticity, high temperature resistance and strong compressibility. When the furnace door is locked, the fiber rope is compressed to half of its normal size, which plays a preliminary sealing and isolation role.

[0013] This utility model also provides a large-tonnage vacuum furnace, including the large-tonnage vacuum furnace door translation and lifting system and the large-tonnage vacuum furnace door hydraulic locking device.

[0014] As a further preferred embodiment of this utility model, the furnace body has a furnace chamber, a left column and a right column are installed on the left and right sides of the furnace body respectively, and a lifting bracket is installed on the top, forming a complete vacuum furnace structure.

[0015] As a further preferred embodiment of this utility model, the furnace door, left column, right column, lifting bracket, drive mechanism, chain drive device, translation mechanism, hydraulic locking device and sealing structure cooperate with each other to realize the functions of horizontal movement, vertical lifting, hydraulic locking and vacuum sealing of the furnace door.

[0016] The present invention relates to a large-tonnage vacuum furnace and its furnace door translation and lifting system and hydraulic locking device, which have the following beneficial effects:

[0017] (1) The translation and lifting system of the furnace door in this utility model ensures that the large-tonnage vacuum furnace meets the engineering requirements and can effectively solve the problems of uneven force on the large-tonnage hinged furnace door leading to structural deformation, difficulty for staff to open, and large space occupation when opening.

[0018] (2) The hydraulic locking device of the furnace door in this utility model can realize the vacuum sealing of the furnace door, increase the safety of the equipment, extend the service life, and reduce energy consumption. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the vacuum furnace door.

[0020] Figure 2 This is a partial schematic diagram of the furnace door.

[0021] Figure 3 This is a front view of the drive mechanism and chain drive.

[0022] Figure 4 This is a schematic diagram of the translation mechanism.

[0023] Figure 5 This is a schematic diagram of the hydraulic locking mechanism.

[0024] Figure 6 This is a schematic diagram of the furnace door sealing method.

[0025] The labels in the diagram indicate: 1. Furnace door; 101. Wedge block; 102. Hanger bolt; 103. Furnace door flange; 104. Furnace door refractory material; 2. Left column; 3. Chain drive device; 301. Main shaft; 302. Sprocket 1; 303. Sprocket 2; 304. Sprocket 3; 305. Chain; 306. Guide sprocket assembly; 4. Lifting bracket; 5. Drive mechanism; 501. Motor; 502. Reducer; 503. Drive shaft; 6. Right column; 7. Hydraulic locking mechanism; 701. Locking slider; 7 02. Pressing block; 703. Thrust roller assembly; 704. Pin shaft; 705. Hydraulic cylinder; 8. Limiting wheel; 9. Translation wheel; 10. Translation mechanism; 1001. Cylinder seat; 1002. Cylinder; 1003. Translation groove; 1004. Guide shaft; 1005. Guide seat; 1006. Shaft support; 11. Furnace body; 12. Guide wheel; 13. Furnace body refractory material; 14. Silicone rubber sealing ring; 15. Graphite packing; 16. Fiber rope; 17. Furnace chamber; 18. Protective steel plate. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 6 As shown, the large-tonnage vacuum furnace door sliding and lifting system and its hydraulic locking device in this embodiment include a furnace body 11 with a furnace chamber 17. A left column 2 and a right column 6 are installed on the left and right sides of the furnace body, respectively. A lifting bracket 4 is installed on the top, and a drive mechanism 5 is installed on the lifting bracket 4. Chain drive devices 3 are connected to both sides of the drive mechanism 5. The drive device 3 is connected to the furnace door 1 through a hanging rod bolt 102. At the same time, a sliding wheel 9, a limiting wheel 8, and a guide wheel 12 are installed on the furnace door 1. The left column 2 and the right column 6 are designed with limiting bars and guide grooves to limit the left and right and front and back swing of the furnace door 1. Driven by the drive device 5 and the chain drive device 3, the furnace door 1 can realize lifting and lowering operations under the joint action of the limiting wheel 8 and the guide wheel 12.

[0028] The drive mechanism 5 includes a motor 501, a reducer 502, and a drive shaft 503; the chain drive device 3 includes a main shaft 301, a first sprocket 302, a second sprocket 303, a third sprocket 304, a chain 305, and a guide sprocket group 306. The chain drive device 3 is arranged symmetrically on the left and right sides and is connected to the drive mechanism 5 through the drive shaft 503 to transmit the output torque of the motor, drive the second sprocket 303 to rotate, and drive the chain 305 to move, thereby raising or lowering the furnace door 1.

[0029] When the furnace door 1 is locked, it needs to be moved horizontally to deviate from the hydraulic locking mechanism 7 by a certain distance before it can be lifted. The horizontal movement of the furnace door 1 is achieved by the horizontal movement mechanism 10, which includes a cylinder seat 1001, a cylinder 1002, a horizontal movement groove 1003, a guide shaft 1004, a guide seat 1005, and a shaft support 1006. The cylinder seat 1001 is symmetrically installed on both sides of the furnace body 11, and the cylinder 1002 is installed on the cylinder seat 1001. The two ends of the guide shaft 1004 are fixed to the cylinder seat 1001 through the guide seats 1005. A set of guide seats 1005 is installed at the top and bottom of the horizontal movement groove 1003, and the side is connected to the cylinder 1002. The guide seats 1005 can slide freely on the guide shaft 1004. When the furnace door 1 is in the lower position, the horizontal movement wheel 9 is located in the horizontal movement groove 1003. By extending and retracting the cylinder 1002, the furnace door 1 can be driven to move horizontally back and forth.

[0030] The vacuum locking seal of the furnace door is achieved through a hydraulic locking mechanism 7 and a triple sealing structure. The hydraulic locking mechanism 7 includes a locking slider 701, a pressure block 702, a retaining wheel assembly 703, a pin 704, and a hydraulic cylinder 705. The locking slider 701 is connected to the piston rod of the hydraulic cylinder 705 through the pin 704. The other end of the hydraulic cylinder 705 is connected to the furnace body 11 through the pin. The pressure block 702 and the retaining wheel assembly 703 are installed on the furnace body 11. Under the action of the pressure block 702 and the retaining wheel assembly 703, the locking slider 701 can slide left and right through the drive of the hydraulic cylinder 705. The locking slider 705 is provided with an inclined surface opposite to the direction of the wedge block 101. Through the movement cooperation with the wedge block 101, the locking and unlocking of the furnace door 1 is realized.

[0031] The triple sealing structure between the furnace door 1 and the furnace body 11 is mainly achieved through a silicone rubber sealing ring 14, graphite packing 15, and fiber rope 16. The silicone rubber sealing ring 14 is installed in the sealing groove of the furnace door flange 103. When the furnace door 11 is locked by the hydraulic locking mechanism 7, the furnace door flange 103 fits against the furnace body flange and compresses the silicone rubber sealing ring 14, forming the first seal to isolate external air. The furnace door 1 is riveted with furnace door refractory material 104, and the furnace body 11 is riveted with furnace body refractory material 13. The refractory material covers the protective steel plate 18, and a sealing groove is provided on the protective steel plate 18. Graphite packing 15 is installed at the lower part of the plate, forming the second seal with the contact surface of the furnace door refractory material 104. Fiber rope 16 is installed at the upper part, forming the third seal with the corner of the furnace door refractory material 104. This effectively prevents high-temperature gas from seeping into the gap between the furnace door 1 and the furnace body 11, preventing the aging of the silicone rubber sealing ring 14 caused by high-temperature gas and extending its service life.

Claims

1. A translational lifting system for the door of a large-tonnage vacuum furnace, characterized in that, The furnace includes a furnace door (1), a left column (2), a right column (6), a lifting bracket (4), a drive mechanism (5), a chain drive device (3), and a translation mechanism (10). The furnace door (1) is equipped with a guide wheel (12), a limit wheel (8), and a translation wheel (9). The lifting bracket (4) is installed on the top of the furnace body (11). The drive mechanism (5) is installed on the lifting bracket (4) and connected to the chain drive device (3) through a drive shaft (503). The chain drive device (3) is connected to the furnace door (1). The left column (2) and the right column (6) are installed on both sides of the furnace body (11). The translation mechanism (10) is installed on the left column (2) and the right column (6) to drive the furnace door (1) to move horizontally.

2. The translation and lifting system for the large-tonnage vacuum furnace door according to claim 1, characterized in that, The translation mechanism (10) includes a cylinder seat (1001), a cylinder (1002), a translation groove (1003), a guide shaft (1004), a guide seat (1005), and a shaft support (1006). When the furnace door (1) is in the lower position, the translation wheel (9) is in the translation groove (1003). The translation groove (1003) can be driven by the cylinder (1002) to perform horizontal reciprocating motion, thereby driving the furnace door (1) to move horizontally.

3. The translation and lifting system for the large-tonnage vacuum furnace door according to claim 1, characterized in that, The drive mechanism (5) includes a motor (501), a reducer (502) and a drive shaft (503). The chain drive device (3) includes a main shaft (301), a sprocket one (302), a sprocket two (303), a chain (305) and a guide sprocket group (306). The furnace door (1) is installed on the closed-loop chain (305). The lifting bracket (4) is equipped with a dual-output shaft reducer (502). The two ends of the dual-output shaft reducer (502) are respectively connected to one end of the drive shaft through universal couplings to realize the synchronous rotation of the main shaft. The two ends of the drive shaft are respectively installed on the mounted outer spherical ball bearings. The mounted outer spherical ball bearings are fixed to the lifting bracket (4) by bolts. The sprocket one (302) is installed in the middle of the drive shaft. The chain (305) realizes closed-loop movement through the sprocket one (302), sprocket two (303) and guide sprocket group (306), thereby driving the furnace door (1) to move up and down.

4. A hydraulic locking device for the door of a large-tonnage vacuum furnace, characterized in that, The translational lifting system according to any one of claims 1-3 further includes a locking slider (701), a pressure block (702), a wedge block (101), a hydraulic cylinder (705), and a thrust roller assembly (703). The wedge block (101) is welded to the four sides of the furnace door (1). The locking slider (701) and the hydraulic cylinder (705) are connected by a pin (704). The pressure block (702) is installed on the upper surface of the locking slider (701) and is connected to the furnace door (1) by bolts. The hydraulic locking device can drive the locking slider (701) to move by the extension and retraction of the hydraulic cylinder (705). The locking slider (701) is provided with an inclined surface opposite to the direction of the wedge block (101). By cooperating with the movement of the wedge block (101), the locking and unlocking actions of the furnace door (1) are realized.

5. The hydraulic locking device for the door of a large-tonnage vacuum furnace according to claim 4, characterized in that, Driven by the hydraulic cylinder (705), the locking slider (701) slides along the guide structure on the furnace body (11) and cooperates with the wedge block (101) to lock and unlock the furnace door (1).

6. The hydraulic locking device for the door of a large-tonnage vacuum furnace according to claim 5, characterized in that, It also includes a sealing structure, which adopts a triple sealing form, including fiber rope (16), graphite packing (15) and silicone rubber sealing ring (14). The silicone rubber sealing ring (14) is installed in the sealing groove of the furnace door flange (103). When the furnace door (1) is locked, the furnace door flange (103) fits against the furnace body flange and compresses the silicone rubber sealing ring (14) to form the first seal. The furnace door (1) is riveted with furnace door refractory material (104), and the furnace body (11) is riveted with furnace body refractory material (13). The refractory material covers the protective steel plate (18). The protective steel plate (18) is provided with a sealing groove. Graphite packing (15) is installed at the lower part of the plate and forms the second seal with the contact surface of the furnace door refractory material (104). Fiber rope (16) is installed at the upper part and forms the third seal with the corner of the furnace door refractory material (104).

7. The hydraulic locking device for the door of a large-tonnage vacuum furnace according to claim 6, characterized in that, The fiber rope (16) has the characteristics of low density, good elasticity, high temperature resistance and strong compressibility. When the furnace door (1) is locked, the fiber rope (16) is compressed to half of its normal state, which plays a preliminary sealing and isolation role.

8. A large-tonnage vacuum furnace, characterized in that, It includes the large-tonnage vacuum furnace door translation and lifting system as described in any one of claims 1-4 and the hydraulic locking device for the large-tonnage vacuum furnace door as described in any one of claims 5-7.

9. The large-tonnage vacuum furnace according to claim 8, characterized in that, The furnace body (11) has a furnace chamber (17), and a left column (2) and a right column (6) are installed on the left and right sides of the furnace body (11) respectively. A lifting bracket (4) is installed on the top, forming a complete vacuum furnace structure.

10. The large-tonnage vacuum furnace according to claim 8, characterized in that, The furnace door (1), left column (2), right column (6), lifting bracket (4), drive mechanism (5), chain drive device (3), translation mechanism (10), hydraulic locking device and sealing structure work together to realize the horizontal movement, vertical lifting, hydraulic locking and vacuum sealing functions of the furnace door (1).

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