Long-span ultrahigh vacuum heat treatment equipment with two local heating ends

Abstract

The utility model belongs to the field of vacuum heat treatment equipment, and particularly relates to long-span ultrahigh vacuum heat treatment equipment with two local heating ends. The utility model provides equipment for carrying out ultrahigh vacuum heat treatment on welding seams at two ends of a long hexagonal stainless steel pipe without oxidation. A hollow furnace body is arranged above the support, the interior of the furnace body is a heating space, a vacuum system and a high-frequency power source which are communicated with the interior of the furnace body are arranged on the inner side of the support, a main furnace opening is formed in one end of the furnace body, a main furnace door is arranged on the main furnace opening, and heating devices are arranged at the two ends in the furnace body. The heating device is connected with a power source through a power connection device, the main furnace door is locked and installed through a furnace door lifting assembly and a furnace door locking assembly, the occupied space is small, the locking effect is good, the interior of the furnace body is vacuumized through a rotary vane pump and a molecular pump, and it is guaranteed that the stainless steel surface of a workpiece cannot be oxidized at the temperature of 400-700 DEG C.

Description

Technical Field

[0001] The utility model belongs to the field of vacuum heat treatment equipment, in particular to ultra-high vacuum heat treatment equipment with local heating at both ends of a long span. Background Art

[0002] Vacuum heat treatment is a new type of heat treatment technology that combines vacuum technology with heat treatment technology. During vacuum heat treatment, it can achieve no oxidation, no decarburization, and no carburization. It can remove phosphorus chips on the surface of the workpiece and has the functions of degreasing and degassing, thereby achieving the effect of surface brightening and purification.

[0003] The surface of stainless steel metal is very easy to oxidize at 400℃~700℃. Therefore, it is necessary to ensure the leakage rate of the equipment and ensure that the vacuum degree is high enough when the equipment is used at 400℃~700℃.

[0004] There is a 4-meter-long hexagonal stainless steel pipe with two ends welded and the weld needs to be heat treated and annealed. Due to the gripping form of the robot, the hexagonal steel pipe can only enter the furnace in the form of the upper and lower corners along the vertical direction. And because only local heating is carried out and the heated part cannot have oxidation marks, the furnace cavity of the entire equipment cannot be dried and vented. During the local heating process, the overall workpiece and the furnace cavity have a large amount of venting, and the equipment needs to maintain a high vacuum throughout the process. Utility Model Content

[0005] In order to solve the above problems, the utility model proposes an ultra-high vacuum heat treatment equipment suitable for heating the long span ends of long hexagonal stainless steel pipes and not oxidizing them.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme, including a bracket, a furnace body with a hollow interior is arranged above the bracket, a vacuum system and a power supply connected to the furnace body are arranged on the inner side of the bracket, a main furnace mouth is arranged at one end of the furnace body, a main furnace door is arranged on the main furnace mouth, heating devices are arranged at both ends of the furnace body, and the heating devices are connected to the power supply through a power connection device.

[0007] As a preferred solution of the utility model, a roller conveyor for transporting workpieces is provided inside the furnace body, and several groups of rollers are provided on the roller conveyor. A buffer device is provided on the side of the furnace body away from the main furnace mouth, and the buffer device includes a spring, and one end of the spring away from the main furnace mouth is connected to the inner side of the furnace body, and the end of the spring close to the main furnace mouth is connected to a buffer block.

[0008] As another preferred embodiment of the present invention, the power connection device includes a copper busbar assembly connected to a power source, the copper busbar assembly is connected to a power connection block, the power connection block is connected to a conductive tube, the conductive tube is connected to a heating device, and an insulating plate is provided between the conductive tube and the furnace body.

[0009] As a third preferred solution of the utility model, it also includes a furnace door lifting assembly and a furnace door locking assembly.

[0010] The furnace door lifting assembly includes a lifting cylinder arranged in a vertical direction on one side of the bracket close to the main furnace opening and guide rails located on both sides of the lifting cylinder, the telescopic rod of the lifting cylinder is arranged upward, a lifting plate is arranged through the guide rail and the telescopic rod of the lifting cylinder, a plurality of clamping cylinders are arranged on the lifting plate, the telescopic rod of the clamping cylinder is arranged toward the main furnace opening, and the main furnace door is connected through the telescopic rod of the clamping cylinder;

[0011] The furnace door locking assembly includes a locking ring arranged at the main furnace opening and matching the main furnace door. A locking cylinder for controlling the rotation of the locking ring is arranged on the bracket, and a telescopic rod of the locking cylinder is connected to the locking ring.

[0012] As a fourth preferred embodiment of the present utility model, the vacuum system includes a molecular pump unit, a rotary vane pump unit and a bleed assembly, the molecular pump unit and the rotary vane pump unit are arranged on both sides outside the furnace body, the molecular pump unit and the rotary vane pump unit are both connected to the furnace body, the molecular pump unit and the rotary vane pump unit are connected by a bellows, the bleed assembly includes a bleed valve and a bleed pipe, the bleed pipe is installed on the surface of the furnace body and is connected to the inside of the furnace body, and the bleed valve is installed on the bleed pipe.

[0013] As a fifth preferred embodiment of the present invention, observation windows are provided on both sides of the furnace body, and the positions of the observation windows match the positions of the heating components.

[0014] As a sixth preferred embodiment of the present invention, an infrared component is included, wherein the infrared component includes a mounting frame arranged outside the observation window on the furnace body, and an infrared instrument for measuring the temperature of the weld through the observation window is arranged on the mounting frame.

[0015] As the seventh preferred embodiment of the present invention, a rear furnace opening is provided at one end of the furnace body away from the main furnace opening for easy maintenance and installation of equipment, and a matching rear furnace door is provided at the rear furnace opening.

[0016] As an eighth preferred embodiment of the present invention, a thermocouple assembly is disposed on the furnace body, one end of the thermocouple assembly is disposed inside the furnace body, and the other end is disposed outside the furnace body.

[0017] As a ninth preferred embodiment of the present utility model, the overlapping portion of the furnace body and the power connection device adopts a double-layer water-cooling jacket structure.

[0018] Beneficial effects of the utility model:

[0019] The utility model proposes a device for ultra-high vacuum heat treatment of the welds at both ends of a long hexagonal stainless steel pipe without oxidation. The furnace door lifting assembly and the furnace door locking assembly reduce the space occupied by the main furnace door of the equipment, and the vacuum degree of the equipment can be increased to 10 at both ends of the furnace body through molecular pumps. -4 Pa, ensuring that the stainless steel surface of the workpiece will not oxidize at 400℃~700℃; the utility model has a simple structure and low manufacturing and maintenance costs. In order to facilitate installation and maintenance, a rear furnace door is provided at the other end of the furnace body; the utility model is provided with a thermocouple component and an infrared component, which are used to timely feedback the processing progress, accurately control the heating temperature, and try to achieve the best processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is the front view and top view of the utility model.

[0022] Figure 3 It is a schematic diagram of the structure of the power connection device of the utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the buffer device of the utility model.

[0024] Figure 5 It is a schematic diagram of the roller structure of the utility model.

[0025] In the accompanying drawings, 1 is a furnace body, 2 is a furnace door lifting assembly, 3 is a furnace door locking assembly, 4 is a power connection device, 5 is a vacuum system, 6 is a roller table, 7 is a degassing assembly, 8 is a thermocouple assembly, 9 is an infrared assembly, 10 is a lifting cylinder, 11 is a power supply, 12 is a rear furnace door, 13 is a buffer device, 14 is an observation window, 15 is a lifting plate, 16 is a bracket, 17 is a guide rail, 18 is a pressing cylinder, 19 is a guide support, 20 is a main furnace door, 21 is a locking ring, 22 is a locking cylinder, 23 is a copper busbar assembly, 24 is an insulating plate, 25 is a conductive tube, 26 is a power connection block, 27 is a heating device, 28 is a molecular pump unit, and 29 is a rotary vane pump unit. DETAILED DESCRIPTION

[0026] The utility model adopts the following technical solutions: Figure 1 and Figure 2 As shown, it includes a bracket 16, a furnace body 1 with a hollow interior is arranged above the bracket 16, a vacuum system 5 and a high-frequency power supply 11 connected to the furnace body 1 are arranged on the inner side of the bracket 16, a main furnace opening is arranged at one end of the furnace body 1, and a main furnace door 20 is arranged on the main furnace opening, and heating devices 27 are arranged at both ends of the furnace body 1, and the heating device 27 is a heating coil, and the heating device 27 is connected to the power supply 11 through the power connection device 4, and the power connection device 4 and the power supply 11 are connected to the control cabinet.

[0027] As a preferred embodiment of the present invention, Figure 4 and Figure 5 As shown, a roller conveyor 6 for transporting hexagonal stainless steel pipes is arranged inside the furnace body 1, and several groups of rollers are arranged on the roller conveyor 6, each group includes two rollers, and the two rollers are V-shaped, which matches the shape of the hexagonal stainless steel pipe. A buffer device 13 is arranged on the side of the furnace body 1 away from the main furnace mouth, and the buffer device 13 includes a spring, and the end of the spring away from the main furnace mouth is connected to the inner side of the furnace body 1, and the end of the spring close to the main furnace mouth is connected to a buffer block, and the buffer block is a copper block, which provides buffering for the hexagonal stainless steel pipe after being fed into the furnace body 1.

[0028] As another preferred embodiment of the present invention, Figure 3 As shown, the power connection device 4 includes a copper busbar assembly 23 connected to the power supply 11, the copper busbar assembly 23 is connected to a power connection block 26, the power connection block 26 is connected to a conductive tube 25, the conductive tube 25 is connected to a heating device 27, and an insulating plate 24 is provided between the conductive tube 25 and the furnace body 1.

[0029] As a third preferred solution of the utility model, it also includes a furnace door lifting assembly 2 and a furnace door locking assembly 3.

[0030] The furnace door lifting assembly 2 includes a lifting cylinder 10 arranged in a vertical direction on one side of a bracket 16 close to the main furnace mouth and guide rails 17 located on both sides of the lifting cylinder 10. The telescopic rod of the lifting cylinder 10 is arranged upward, and a lifting plate 15 is arranged through the guide rail 17 and the telescopic rod of the lifting cylinder 10. Three evenly arranged pressing cylinders 18 are arranged on the lifting plate 15. The telescopic rod of the pressing cylinder 18 is arranged toward the main furnace mouth, and the main furnace door 20 is connected through the telescopic rod of the pressing cylinder 18. The main furnace door 20 is provided with a guide support 19 for supporting the main furnace door 20 to ensure that the telescopic rod of the pressing cylinder 18 is not crushed and damaged, and moves horizontally through the linear bearing on the lifting plate 15;

[0031] The furnace door locking assembly 3 includes a locking ring 21 arranged at the main furnace opening and matching the main furnace door 20 . A locking cylinder 22 for controlling the rotation of the locking ring 21 is arranged on the bracket 16 . The telescopic rod of the locking cylinder 22 is connected to the locking ring 21 .

[0032] The lifting cylinder 10 drives the lifting plate 15 and the main furnace door 20 to rise to a position corresponding to the main furnace opening, the clamping cylinder 18 drives the main furnace door 20 to move toward the main furnace opening and clamp it, and the locking cylinder 22 drives the locking ring 21 to rotate until the locking ring 21 matches and locks the main furnace door 20.

[0033] As the fourth preferred embodiment of the present utility model, the vacuum system 5 includes a molecular pump unit 28, a rotary vane pump unit 29 and a bleed assembly 7. The molecular pump unit 28 and the rotary vane pump unit 29 are arranged on both sides outside the furnace body 1. The molecular pump unit 28 and the rotary vane pump unit 29 are both connected to the furnace body 1. The molecular pump unit 28 and the rotary vane pump unit 29 are connected by a bellows. The bleed assembly 7 includes a bleed valve and a bleed pipe. The bleed pipe is installed on the surface of the furnace body 1 and is connected to the inside of the furnace body 1. The bleed valve is installed on the bleed pipe.

[0034] As a fifth preferred embodiment of the present invention, observation windows 14 are provided on both sides of the furnace body 1 , and the positions of the observation windows 14 match the position of the heating assembly 27 , and the state of the hexagonal stainless steel pipe is observed through the observation windows 14 .

[0035] As a sixth preferred embodiment of the present invention, it includes an infrared component 9, which includes a mounting frame arranged outside the observation window 14 on the furnace body 1, and an infrared instrument for measuring the temperature of the weld through the observation window 14 is arranged on the mounting frame.

[0036] As the seventh preferred scheme of the utility model, the furnace body 1 is provided with a rear furnace opening at one end away from the main furnace opening for easy maintenance and installation of equipment, and a matching rear furnace door 12 is provided at the rear furnace opening, and one end of the spring of the buffer device 13 is connected to the rear furnace door 12.

[0037] As an eighth preferred embodiment of the present invention, a thermocouple assembly 8 is provided on the furnace body 1 , one end of the thermocouple assembly 8 is provided on the inner side of the furnace body 1 , and the other end is provided on the outer side of the furnace body 1 . The thermocouple assembly 8 is used to measure the ambient temperature inside the furnace body 1 .

[0038] As a ninth preferred embodiment of the present invention, the overlapping portion of the furnace body 1 and the power connection device 4 adopts a double-layer water-cooling jacket structure.

[0039] In the actual design, the furnace door lifting assembly 2 and the furnace door locking assembly 3 reduce the space occupied by the main furnace door 20 of the equipment, and the molecular pumps at both ends increase the vacuum degree of the equipment to 10 -4 Pa, to ensure that the stainless steel surface of the workpiece will not oxidize at 400℃~700℃.

[0040] Brief description of the working process: First, the workpiece is loaded into the furnace through the external transmission line manipulator and the roller 6 in the furnace body 1. After the main furnace door 20 is closed through the furnace door lifting assembly 2 and the furnace door locking assembly 3, the rotary vane pump unit 29 in the vacuum system 5 is started to roughly evacuate the furnace body 1. When the vacuum degree reaches 10Pa, the molecular pump unit 28 is started to evacuate the furnace body 1. When the vacuum degree reaches 8×10 -4After Pa, the heating chamber starts to heat according to the preset heating curve. After the heating curve ends, the vent valve is opened immediately. After breaking through the air, the main furnace door 20 is opened to take out the parts through the external furnace transmission line manipulator.

[0041] The above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiment of the utility model. It should be understood by those skilled in the art that the utility model can still be modified or replaced by equivalents to achieve the same technical effect. As long as the use requirements are met, they are within the scope of protection of the utility model.

Claims

1. An ultra-high vacuum heat treatment equipment with local heating at both ends of a long span, characterized in that: The invention comprises a support (16), a furnace body (1) with a hollow interior is arranged above the support (16), a vacuum system (5) and a power source (11) which are connected to the furnace body (1) are arranged inside the support (16), a main furnace opening is arranged at one end of the furnace body (1), a main furnace door (20) is arranged on the main furnace opening, heating devices (27) are arranged at both ends of the furnace body (1), and the heating devices (27) are connected to the power source (11) via a power connection device (4).

2. The ultra-high vacuum heat treatment equipment with local heating at both ends of a long span as claimed in claim 1, characterized in that: A roller conveyor (6) for transporting workpieces is arranged inside the furnace body (1), and a plurality of groups of rollers are arranged on the roller conveyor (6). A buffer device (13) is arranged on a side of the furnace body (1) away from a main furnace opening, and the buffer device (13) comprises a spring, and one end of the spring away from the main furnace opening is connected to the inner side of the furnace body (1), and one end of the spring close to the main furnace opening is connected to a buffer block.

3. The ultra-high vacuum heat treatment equipment with local heating at both ends of a long span as claimed in claim 1, characterized in that: The power connection device (4) comprises a copper busbar assembly (23) connected to a power source (11), the copper busbar assembly (23) being connected to a power connection block (26), the power connection block (26) being connected to a conductive tube (25), the conductive tube (25) being connected to a heating device (27), and an insulating plate (24) being provided between the conductive tube (25) and the furnace body (1).

4. The ultra-high vacuum heat treatment equipment with local heating at both ends of a long span as claimed in claim 1, characterized in that: It comprises a furnace door lifting assembly (2) and a furnace door locking assembly (3), The furnace door lifting assembly (2) comprises a lifting cylinder (10) arranged in a vertical direction on one side of a bracket (16) close to the main furnace opening, and guide rails (17) located on both sides of the lifting cylinder (10); the telescopic rod of the lifting cylinder (10) is arranged upward, and a lifting plate (15) is arranged through the guide rail (17) and the telescopic rod of the lifting cylinder (10); a plurality of clamping cylinders (18) are arranged on the lifting plate (15); the telescopic rod of the clamping cylinder (18) is arranged toward the main furnace opening, and the main furnace door (20) is connected through the telescopic rod of the clamping cylinder (18); The furnace door locking assembly (3) comprises a locking ring (21) arranged at the main furnace opening and matching the main furnace door (20); a locking cylinder (22) for controlling the rotation of the locking ring (21) is arranged on the bracket (16); and a telescopic rod of the locking cylinder (22) is connected to the locking ring (21).

5. The ultra-high vacuum heat treatment equipment with local heating at both ends of a long span as claimed in claim 1, characterized in that: The vacuum system (5) comprises a molecular pump unit (28), a rotary vane pump unit (29) and a venting assembly (7). The molecular pump unit (28) and the rotary vane pump unit (29) are arranged on both sides outside the furnace body (1). The molecular pump unit (28) and the rotary vane pump unit (29) are both connected to the furnace body (1). The molecular pump unit (28) and the rotary vane pump unit (29) are connected to the furnace body (1) via a bellows. The venting assembly (7) comprises a venting valve and a venting pipe. The venting pipe is installed on the surface of the furnace body (1) and is connected to the inside of the furnace body (1). The venting valve is installed on the venting pipe.

6. The ultra-high vacuum heat treatment equipment with local heating at both ends over a long span as claimed in claim 1, characterized in that: Observation windows (14) are provided on both sides of the furnace body (1), and the positions of the observation windows (14) match the positions of the heating devices (27).

7. The ultra-high vacuum heat treatment equipment with long span and local heating at both ends as claimed in claim 6, characterized in that: The infrared component (9) comprises a mounting frame arranged outside an observation window (14) on a furnace body (1), and an infrared instrument for measuring the temperature of a weld through the observation window (14) is arranged on the mounting frame.

8. The ultra-high vacuum heat treatment equipment with local heating at both ends over a long span as claimed in claim 1, characterized in that: The furnace body (1) is provided with a rear furnace opening at one end away from the main furnace opening for facilitating maintenance and installation of equipment, and a matching rear furnace door (12) is provided at the rear furnace opening.

9. The ultra-high vacuum heat treatment equipment with local heating at both ends over a long span as claimed in claim 1, characterized in that: A thermocouple assembly (8) is arranged on the furnace body (1); one end of the thermocouple assembly (8) is arranged on the inner side of the furnace body (1), and the other end is arranged on the outer side of the furnace body (1).

10. The ultra-high vacuum heat treatment equipment with long span and local heating at both ends as claimed in claim 1, characterized in that: The overlapping portion of the furnace body (1) and the power connection device (4) adopts a double-layer water-cooling jacket structure.

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