Three-chamber continuous vacuum heat treatment furnace

Abstract

The present application relates to a kind of three-chamber continuous vacuum heat treatment furnace, comprising: shell, shell has sequentially arranged feeding chamber, heat treatment chamber and discharging chamber, heat treatment chamber has the feeding port being communicated with feeding chamber and the discharging port being communicated with discharging chamber, the side of feeding chamber away from feeding port has make-up port, the side of discharging chamber away from discharging port has material taking port;Two outer furnace door assemblies, two outer furnace door assemblies are respectively arranged in make-up port and material taking port;Heat treatment furnace, heat treatment furnace includes the furnace body being arranged in heat treatment chamber and being respectively connected to feeding port and discharging port and two inner furnace door assemblies being respectively arranged in feeding port and discharging port;And two feeding and discharging devices, two feeding and discharging devices are respectively arranged in feeding chamber and discharging chamber;Through three chambers, the feeding and discharging device capable of automatically feeding and discharging, can realize continuous uninterrupted production, reduce the number of furnace opening and closing, reduce heat loss, improve production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum heat treatment, in particular to a three-chamber continuous vacuum heat treatment furnace. BACKGROUND

[0002] The vacuum heat treatment furnace is mainly applied to the heat treatment process of materials, including sintering, pyrolysis, annealing, quenching, tempering, carburizing, etc., and is widely used in the industries of aerospace, automobile manufacturing, energy equipment and die manufacturing. The core technology of the vacuum heat treatment furnace lies in realizing the heat treatment process without oxidation and decarburization through a vacuum environment.

[0003] At present, most of the heat treatment furnaces are single-chamber or double-chamber structures, and the furnace door is frequently opened and closed during the production process, resulting in heat loss in the heat treatment furnace, the need for frequent temperature rising and vacuumizing, and problems such as low production efficiency, high energy consumption and complex process. In addition, the manual feeding mode is adopted, the degree of automation is low, and the labor cost is high. SUMMARY

[0004] Therefore, it is necessary to provide a three-chamber continuous vacuum heat treatment furnace in view of the problems of low production efficiency, high energy consumption and complex process existing in the prior art.

[0005] In one aspect, the present application provides a three-chamber continuous vacuum heat treatment furnace, comprising:

[0006] An outer shell, the outer shell has a feeding chamber, a heat treatment chamber and a discharging chamber arranged in sequence, the heat treatment chamber has a feeding port communicating with the feeding chamber and a discharging port communicating with the discharging chamber, the side of the feeding chamber away from the feeding port has a feeding port, and the side of the discharging chamber away from the discharging port has a discharging port;

[0007] Two outer furnace door assemblies, the two outer furnace door assemblies are respectively arranged at the feeding port and the discharging port;

[0008] A heat treatment furnace, the heat treatment furnace comprises a furnace body arranged in the heat treatment chamber and connected to the feeding port and the discharging port, and two inner furnace door assemblies arranged at the feeding port and the discharging port, respectively; and,

[0009] Two feeding and discharging devices, the two feeding and discharging devices are respectively arranged in the feeding chamber and the discharging chamber, the feeding and discharging device comprises a fork assembly, a translation assembly and a lifting assembly, the translation assembly is drivingly connected to the fork assembly, and the lifting assembly is drivingly connected to the translation assembly.

[0010] In one of the embodiments, the translation assembly includes a pair of sprocket assemblies, a transmission shaft, a pair of connecting assemblies and a motor assembly, each of the sprocket assemblies includes a driving sprocket, a driven sprocket and a transmission chain engaged with the driving sprocket and the driven sprocket, each of the connecting assemblies includes a transmission connector fixed to the transmission chain and a connecting pin fixed to the fork assembly, the connecting pin is inserted into the transmission connector, the transmission shaft is fixedly connected to the driving sprockets, and the motor assembly is drivingly connected to the transmission shaft.

[0011] In one of the embodiments, the housing includes a motor connecting portion with a shaft hole, the motor assembly is arranged outside the housing, and the transmission shaft is connected to the motor assembly through the shaft hole.

[0012] In one of the embodiments, the three-chamber continuous vacuum heat treatment furnace includes a radial sealing assembly, the radial sealing assembly includes a shaft seal seat, an intermediate ring, a pair of skeleton sealing rings, a shaft seal cover and an oil cup, the shaft seal seat is fixed to the motor connecting portion and sleeved on the transmission shaft, the intermediate ring is arranged in the shaft seal seat, the two skeleton sealing rings are arranged at the two ends of the intermediate ring, and the openings of the skeleton sealing rings are oppositely arranged, the shaft seal cover is fixed to the shaft seal seat to press the skeleton sealing rings and form an oil cavity between the intermediate ring and the transmission shaft, the shaft seal seat has an oil inlet hole communicating with the oil cavity, and the oil cup is arranged in the oil inlet hole.

[0013] In one of the embodiments, the motor assembly includes a driving motor and a speed reduction assembly connected to the driving motor and the transmission shaft respectively.

[0014] In one of the embodiments, the lifting assembly includes a support, a pair of lifting rails, a plurality of groups of guide bearings and a lifting cylinder, the translation assembly is arranged in the support, the lifting rails are fixed to the housing in the up-down direction and arranged at the two sides of the support, a plurality of groups of the guide bearings are arranged at the two sides of the support in the up-down direction and spaced apart, each group of the guide bearings includes two guide bearings, the two sides of the lifting rails have limiting grooves, and the guide bearings are slidably arranged in the limiting grooves, and the lifting cylinder is drivingly connected to the support.

[0015] In one of the embodiments, the housing includes a cylinder connecting portion with a push rod hole, the lifting assembly further includes a cylinder seat, the cylinder seat is fixed to the cylinder connecting portion, the lifting cylinder is fixed to the cylinder seat, and the push rod of the lifting cylinder is drivingly connected to the support through the push rod hole.

[0016] In one of the embodiments, the three-chamber continuous vacuum heat treatment furnace further comprises an axial sealing assembly, which comprises a sealing seat, a support ring, two sets of V-shaped sealing ring groups, a pressing ring, a pair of pressing covers and a compression spring, the sealing seat is arranged between the outer shell and the push rod of the lifting cylinder, the support ring is arranged between the sealing seat and the push rod of the lifting cylinder, two sets of the V-shaped sealing ring groups are arranged at both ends of the support ring, each set of the V-shaped sealing ring groups comprises a plurality of V-shaped sealing rings, the V-shaped sealing rings in the two sets of the V-shaped sealing ring groups are oppositely arranged, the compression spring and the pressing ring are arranged at both ends of the two sets of the V-shaped sealing ring groups, and the two pressing covers are fixedly arranged at both ends of the sealing seat to press the V-shaped sealing rings.

[0017] In one of the embodiments, the fork assembly comprises a trolley, a fork and a pair of limiting assemblies, the translation assembly is drivingly connected to the trolley, the fork is slidably arranged on the trolley, and the limiting assemblies are arranged on both sides of the trolley and are limitingly connected to the fork to drive the fork to move when the trolley is driven by the translation assembly to move.

[0018] In one of the embodiments, each of the limiting assemblies comprises a linear bearing fixedly arranged on the trolley, a limiting plate fixedly arranged on the fork and having a positioning hole, a positioning pin inserted into the linear bearing, a guide wheel rotatably connected to the bottom of the positioning pin, and a return spring arranged between the positioning pin and the linear bearing, both sides of the trolley are provided with limiting guide rails, the limiting guide rails comprise a free section, a limiting section and a transition section connecting the free section and the limiting section, the free section is located at one end of the transition section away from the heat treatment chamber, the height difference between the free section and the limiting plate is greater than the height difference between the limiting section and the separate limiting plate, the guide wheel is slidably connected to the limiting guide rail, when the guide wheel is located in the free section, the return spring is in a free state, and the positioning pin is not inserted into the positioning hole; when the guide wheel is located in the limiting section, the return spring is in a compressed state, and the positioning pin is inserted into the positioning hole.

[0019] In one of the embodiments, the outer furnace door assembly comprises a furnace door cylinder, a furnace door sprocket, a furnace door chain, an outer furnace door and a pair of furnace door guide rails, the furnace door cylinder is fixedly arranged on the top of the outer shell, the furnace door sprocket is rotatably connected to the push rod of the furnace door cylinder, one end of the furnace door chain is fixedly connected to the outer shell, the other end is fixedly connected to the outer furnace door, the furnace door chain is engaged with the furnace door sprocket, the furnace door guide rails are fixedly arranged on the outer shell, and both sides of the outer furnace door are slidably connected to the furnace door guide rails.

[0020] In one of the embodiments, the outer furnace door assembly further comprises a sealing member arranged between the outer furnace door and the outer shell, and a plurality of pressing cylinders respectively fixed to the furnace door guide rails for pressing the outer furnace door.

[0021] The three-chamber continuous vacuum heat treatment furnace of the present application can ensure the vacuum environment of the upper loading chamber, the heat treatment chamber and the lower loading chamber when the outer furnace door assembly is closed and the inner furnace door assembly of the upper loading port or the lower loading port is opened, and can realize continuous and uninterrupted production by cooperating with the upper and lower loading devices capable of automatically loading and unloading, thereby reducing the number of furnace opening and closing, reducing heat loss, and improving production efficiency. In addition, by controlling the lifting assembly and the translation assembly of the upper and lower loading devices, the fork assembly can be lifted and translated, automatic loading and unloading can be realized, manual operation can be reduced, and labor cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A perspective view of the three-chamber continuous vacuum heat treatment furnace according to one embodiment of the present application is shown;

[0023] Figure 2 A cross-sectional view of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0024] Figure 3 A perspective view of the upper and lower loading device of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0025] Figure 4 A top view of the upper and lower loading device of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0026] Figure 5 A side view of the upper and lower loading device of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0027] Figure 6 A partial A enlarged view of the upper and lower loading device of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown; Figure 5

[0028] A partial B enlarged view of the upper and lower loading device of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown; Figure 7 Figure 5 A position diagram of the motor assembly and the lifting cylinder of the three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0029] Figure 8

[0030] Figure 9 ​​A structural schematic diagram of a radial sealing assembly of a three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0031] Figure 10 A structural schematic diagram of an axial sealing assembly of a three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0032] Figure 11 A perspective schematic diagram of an outer furnace door assembly of a three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0033] Figure 12 A cross-sectional schematic diagram of an outer furnace door assembly of a three-chamber continuous vacuum heat treatment furnace according to the above embodiment of the present application is shown;

[0034] Figure 13 A step schematic diagram of an automatic heat treatment method provided for an embodiment of the present application is shown;

[0035] Figure 14 A step schematic diagram of step S100 of an automatic heat treatment method according to the above embodiment of the present application is shown;

[0036] Figure 15 A step schematic diagram of step S300 of an automatic heat treatment method according to the above embodiment of the present application is shown.

[0037] 10, shell; 11, upper feeding chamber; 111, feeding opening; 12, heat treatment chamber; 121, feeding opening; 122, discharging opening; 13, lower discharging chamber; 131, discharging opening; 14, motor connecting part; 141, rotating shaft hole; 15, air cylinder connecting part; 151, push rod hole; 20, outer furnace door assembly; 21, furnace door air cylinder; 22, furnace door chain wheel; 23, furnace door chain; 24, outer furnace door; 25, furnace door guide rail; 26, sealing element; 27, pressing air cylinder; 30, heat treatment furnace; 31, furnace body; 32, inner furnace door assembly; 40, feeding and discharging device; 41, fork assembly; 411, trolley; 4111, limiting guide rail; 41111, free section; 41112, transition section; 41113, limiting section; 412, fork; 413, limiting assembly; 4131, linear bearing; 4132, limiting plate; 41321, positioning hole; 4133, positioning pin; 4134, guide wheel; 4135, return spring; 42, translation assembly; 421, sprocket assembly; 4211, driving sprocket; 4212, driven sprocket; 4213, transmission chain; 422, transmission shaft; 423, connecting assembly; 4231, transmission connector; 4232, connecting pin; 424, motor assembly; 4241, driving motor; 4242, driving speed reduction sprocket; 4243, driven speed reduction sprocket; 4244, speed reduction chain; 43, lifting assembly; 431, support; 432, lifting guide rail; 433, guide bearing; 434, lifting air cylinder; 4341, push rod; 435, air cylinder seat; 50, radial sealing assembly; 51, shaft seal seat; 52, intermediate ring; 53, skeleton sealing ring; 54, shaft seal cover; 55, oil cup; 56, oil cavity; 57, oil inlet hole; 60, axial sealing assembly; 61, sealing seat; 62, support ring; 63, V-shaped sealing ring; 64, pressing ring; 65, gland; 66, pressing spring. DETAILED DESCRIPTION

[0038] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0039] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0040] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] It is to be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] Based on the low production efficiency, high energy consumption and process problems of the existing heat treatment furnace, the three-chamber continuous vacuum heat treatment furnace is provided, which can realize continuous and uninterrupted production through the cooperation of three chambers and the feeding and discharging device capable of automatic feeding and discharging.

[0045] Specifically, please refer to Figure 1 , Figure 2 and Figure 3 , the three-chamber continuous vacuum heat treatment furnace can include an outer shell 10, two outer furnace door assemblies 20, a heat treatment furnace 30 and two feeding and discharging devices 40, the outer shell 10 has a feeding chamber 11, a heat treatment chamber 12 and a discharging chamber 13 arranged in sequence, the heat treatment chamber 12 has a feeding port 121 communicating with the feeding chamber 11 and a discharging port 122 communicating with the discharging chamber 13, the feeding chamber 11 has a feeding port 111 on the side away from the feeding port 121, and the discharging chamber 13 has a discharging port 131 on the side away from the discharging port 122. Two outer furnace door assemblies 20 are arranged at the feeding port 111 and the discharging port 131 respectively for sealing the feeding port 111 and the discharging port 131. The heat treatment furnace 30 includes a furnace body 31 and two inner furnace door assemblies 32, the furnace body 31 is arranged in the heat treatment chamber 12, the furnace body 31 is provided with a furnace bed for placing materials for heat treatment, and is connected to the feeding port 121 and the discharging port 122 respectively, and the two inner furnace door assemblies 32 are arranged at the feeding port 121 and the discharging port 122 respectively for sealing the feeding port 121 and the discharging port 122. Two feeding and discharging devices 40 are arranged in the feeding chamber 11 and the discharging chamber 13 respectively for feeding and discharging, the feeding and discharging device 40 includes a fork assembly 41, a translation assembly 42 and a lifting assembly 43, the translation assembly 42 is drivingly connected to the fork assembly 41 for driving the fork assembly 41 to translate, and the lifting assembly 43 is drivingly connected to the translation assembly 42 for driving the translation assembly 42 and the fork assembly 41 to lift as a whole.

[0046] It can be understood that when the three-chamber continuous vacuum heat treatment furnace of the present application is loading or unloading, the outer furnace door assembly 20 is closed, the inner furnace door assembly 32 of the loading port 121 or the unloading port 122 is opened, the heat treatment chamber 12 is communicated with the loading chamber 11 or the unloading chamber 13, the vacuum environment of the loading chamber 11, the heat treatment chamber 12 and the unloading chamber 13 can be ensured, and in cooperation with the loading and unloading device 40 capable of automatic loading and unloading, continuous and uninterrupted production can be realized, thereby reducing the number of opening and closing of the furnace, reducing heat loss, and improving production efficiency. In addition, by controlling the lifting assembly 43 and the translation assembly 42 of the loading and unloading device 40, the fork assembly 41 can be lifted and translated, thereby realizing automatic loading and unloading and reducing labor cost.

[0047] On the other hand, when the three-chamber continuous vacuum heat treatment furnace of the present application is loading or unloading, the outer furnace door assembly 20 is opened, the loading chamber 11 and the unloading chamber 13 are communicated with the outside through the loading port 111 and the unloading port 131, the inner furnace door assembly 32 is closed, and the heat treatment chamber 12 is not communicated with the loading chamber 11 and the unloading chamber 13, thereby ensuring the vacuum environment of the heat treatment chamber 12 and reducing the heat loss of the heat treatment chamber 12.

[0048] More specifically, as shown in Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , in some embodiments, the translation assembly 42 can include a pair of sprocket assemblies 421, a transmission shaft 422, a pair of connecting assemblies 423 and a motor assembly 424. The two sprocket assemblies 421 are respectively arranged on both sides of the fork assembly 41, each sprocket assembly 421 includes a driving sprocket 4211, a driven sprocket 4212 and a transmission chain 4213 engaged with the driving sprocket 4211 and the driven sprocket 4212, each connecting assembly 423 includes a transmission connector 4231 fixedly connected to the transmission chain 4213 and a connecting pin 4232 fixedly arranged on the fork assembly 41, and the connecting pin 4232 is inserted into the transmission connector 4231. The transmission shaft 422 is fixedly connected to the two driving sprockets 4211, and the motor assembly 424 is drivingly connected to the transmission shaft 422. In this way, the fork assembly 41 is drivingly connected through the connecting pin 4232 and the transmission connector 4231, and when the motor assembly 424 drives the transmission shaft 422 to rotate, the transmission shaft 422 drives the two driving sprockets 4211 to rotate, the driving sprocket 4211 drives the transmission connector 4231 to translate through the transmission chain 4213 cooperating with the driven sprocket 4212, thereby driving the fork assembly 41 to translate.

[0049] Since the temperature in the loading chamber 11 or the unloading chamber 13 is relatively high, it may have some impact on the line of the motor assembly 424, therefore, as shown in Figure 8As shown in some embodiments, the shell 10 includes a motor connecting portion 14 with a rotating shaft hole 141, and the motor assembly 424 is arranged outside the shell 10, and the transmission shaft 422 is connected to the motor assembly 424 through the rotating shaft hole 141. In this way, by arranging the motor assembly 424 outside the shell 10, the lines of the motor assembly 424 can be prevented from being affected by high temperature and causing problems such as aging and short circuit, thereby improving the working stability and service life of the motor assembly 424.

[0050] Since the motor assembly 424 is external, in order to ensure the vacuum environment of the upper loading chamber 11 and the lower loading chamber 13, the rotating shaft hole 141 needs to be sealed, as shown in Figure 8 and Figure 9 As shown in some embodiments, the three-chamber continuous vacuum heat treatment furnace further includes a radial sealing assembly 50, which includes a shaft seal seat 51, an intermediate ring 52, a pair of skeleton sealing rings 53, a shaft seal cover 54, and an oil cup 55. The shaft seal seat 51 is fixedly arranged on the motor connecting portion 14 and is sleeved on the transmission shaft 422, the intermediate ring 52 is arranged in the shaft seal seat 51, two skeleton sealing rings 53 are arranged at both ends of the intermediate ring 52, and the openings of the skeleton sealing rings 53 are oppositely arranged, the shaft seal cover 54 is fixedly arranged on the shaft seal seat 51 to press the skeleton sealing rings 53 and form an oil cavity 56 between the intermediate ring 52 and the transmission shaft 422, the shaft seal seat 51 has an oil inlet hole 57 communicating with the oil cavity 56, and the oil cup 55 is arranged in the oil inlet hole 57. In this way, the skeleton sealing ring 53 has a stamped steel skeleton inside, which has strong anti-deformation ability, and the rubber lip of the skeleton sealing ring 53 forms a line contact seal with the transmission shaft 422. By pressing both ends of the intermediate ring 52 through the shaft seal cover 54 and the shaft seal, and injecting sealing oil into the oil cavity 56 formed between the intermediate ring 52 and the transmission shaft 422 through the oil cup 55, a continuous oil film can be formed between the rubber lip of the skeleton sealing ring 53 and the transmission shaft 422, which can reduce the friction coefficient to the range of 0.05 to 0.1, and can also block the penetration path of gas, thereby ensuring the vacuum environment of the upper loading chamber 11 or the lower loading chamber 13.

[0051] In particular, the oil cup 55 is a needle valve type oil cup 55, which can control the injection amount by adjusting the opening degree of the needle valve, thereby controlling the formation of the continuous oil film between the rubber lip of the skeleton sealing ring 53 and the transmission shaft 422, and ensuring the sealing performance of the transmission shaft 422 and the rotating shaft hole 141.

[0052] Since the translation assembly 42 has a large load, as shown in Figure 4As shown, in some embodiments, the motor assembly 424 includes a driving motor 4241 and a speed reduction assembly connected to the driving motor 4241 and the transmission shaft 422 respectively. By setting the speed reduction assembly, on the one hand, the rotation speed of the driving motor 4241 can be reduced, and the torque output by the motor can be improved; on the other hand, the influence of load inertia on the motor can be reduced, so that the start and stop control of the motor is more stable and the response speed is faster.

[0053] Optionally, as Figure 4 As shown, in some embodiments, the speed reduction assembly can include a driving speed reduction sprocket 4242, a driven speed reduction sprocket 4243, and a speed reduction chain 4244 engaged with the driving speed reduction sprocket 4242 and the driven speed reduction sprocket 4243 respectively, the diameter of the driving speed reduction sprocket 4242 is smaller than the diameter of the driven speed reduction sprocket 4243, so that the number of rotations of the driving speed reduction sprocket 4242 is greater than the number of rotations of the driven speed reduction sprocket 4243, thereby achieving motor speed reduction output.

[0054] Further, as Figure 3 and Figure 5 As shown, in some embodiments, the lifting assembly 43 includes a bracket 431, a pair of lifting rails 432, a plurality of sets of guide bearings 433, and a lifting cylinder 434, the translation assembly 42 is arranged on the bracket 431, the lifting rails 432 are fixedly arranged on the housing 10 in the up-down direction and are arranged on both sides of the bracket 431, the plurality of sets of guide bearings 433 are arranged on both sides of the bracket 431 in the up-down direction, and each set of guide bearings 433 includes two guide bearings 433, both sides of the lifting rails 432 have limiting grooves, and the guide bearings 433 are slidably arranged in the limiting grooves; the lifting cylinder 434 is drivingly connected to the bracket 431. In this way, the lifting cylinder 434 can provide a driving force in the vertical direction, and through the limitation of the guide bearings 433 and the limiting grooves of the lifting rails 432, the bracket 431 can be lifted to drive the translation assembly 42 to lift. Through the cooperation of the lifting rails 432 and the guide bearings 433, the frictional resistance is reduced, and the straightness of the lifting movement is ensured. In addition, the lifting rails 432 can also provide rigid support to withstand the bending moment generated by the eccentric load, thereby providing reliability for the lifting movement of the bracket 431.

[0055] Since the temperature in the feeding chamber 11 or the discharging chamber 13 is relatively high, the pipeline of the lifting cylinder 434 may Figure 8As shown, in some embodiments, the shell 10 comprises a cylinder connecting part 15 with a push rod hole 151, the lifting assembly 43 further comprises a cylinder seat 435 fixedly arranged on the cylinder connecting part 15, a lifting cylinder 434 fixedly arranged on the cylinder seat 435, and a push rod 4341 of the lifting cylinder 434 is drivingly connected to the bracket 431 through the push rod hole 151. In this way, by fixing the lifting cylinder 434 outside the shell 10, the pipeline of the lifting cylinder 434 can be prevented from aging, gas leakage and other problems caused by high temperature, thereby improving the working stability and service life of the lifting cylinder 434.

[0056] As the cylinder is arranged outside, in order to ensure the vacuum environment of the upper loading chamber 11 and the lower loading chamber 13, the three-chamber continuous vacuum heat treatment furnace further comprises a vacuum pump 50 arranged outside the shell 10 and connected to the upper loading chamber 11 and the lower loading chamber 13 through a pipeline 51. Figure 8 and Figure 10 As shown, in some embodiments, the three-chamber continuous vacuum heat treatment furnace further comprises an axial sealing assembly 60, which comprises a sealing seat 61, a support ring 62, two groups of V-shaped sealing rings 63, a pressing ring 64, a pair of pressing covers 65 and a pressing spring 66. The sealing seat 61 is arranged between the shell 10 and the push rod 4341 of the lifting cylinder 434, the support ring 62 is arranged between the sealing seat 61 and the push rod 4341 of the lifting cylinder 434, and two groups of V-shaped sealing rings 63 are arranged at both ends of the support ring 62. Each group of V-shaped sealing rings 63 comprises a plurality of V-shaped sealing rings 63, and the openings of the V-shaped sealing rings 63 in the two groups of V-shaped sealing rings 63 are arranged in opposite directions. The pressing spring 66 and the pressing ring 64 are arranged at both ends of the two groups of V-shaped sealing rings 63, and the two pressing covers 65 are fixedly arranged at both ends of the sealing seat 61 to press the V-shaped sealing rings 63. In this way, by arranging a plurality of V-shaped sealing rings 63, when the internal and external pressure difference between the upper loading chamber 11 or the lower loading chamber 13 and the outside environment becomes larger, the pressure pushes the V-shaped sealing rings 63 to expand further, forming a pressure-elasticity double sealing effect, and the sealing specific pressure is automatically enhanced with the increase of the pressure, and the highest can reach 3 to 5 times of the initial pre-tightening force. The plurality of V-shaped sealing rings 63 are arranged in series, so that the sealing lips of each V-shaped sealing ring 63 consume part of the pressure difference step by step, thereby providing multiple barriers on the leakage path, which can significantly reduce the leakage rate. In addition, by arranging the pressing spring 66, the pressing spring 66 and the V-shaped sealing ring 63 form an elastic combination, which can adapt to the axial movement of the push rod 4341 of the lifting cylinder 434 and the thermal expansion of the push rod 4341. The error of the axial movement can reach ±0.5mm, and the thermal expansion compensation range can reach 2mm to 3mm.

[0057] It is worth noting that the cylinder seat 435 is sealed by oil injection, and the oil injection height is at least flush with the height of the pressing cover 65, so as to improve the sealing performance at the push rod hole 151.

[0058] Further, as shown in the drawings, Figure 3As shown in the drawings, in some embodiments, the fork assembly 41 comprises a trolley 411, a fork 412 and a pair of limiting assemblies 413, the translation assembly 42 is drivingly connected to the trolley 411, the fork 412 is slidably arranged on the trolley 411, and the limiting assemblies 413 are arranged on both sides of the trolley 411 and are limitingly connected to the fork 412 to drive the fork 412 to move when the trolley 411 is driven by the translation assembly 42. In this way, the trolley 411 and the fork 412 are limitingly connected by the limiting assemblies 413, which can well control the translation distance of the fork 412 and play a limiting function.

[0059] Specifically, as shown in the drawings, Figure 5 and Figure 7 In some embodiments, each limiting assembly 413 comprises a linear bearing 4131, a limiting plate 4132, a positioning pin 4133, a guide wheel 4134 and a return spring 4135, the linear bearing 4131 is fixedly arranged on the trolley 411, the limiting plate 4132 is fixedly arranged on the fork 412 and has a positioning hole 41321, the positioning pin 4133 is inserted into the linear bearing 4131, the guide wheel 4134 is rotatably connected to the bottom of the positioning pin 4133, and the return spring 4135 is arranged between the positioning pin 4133 and the linear bearing 4131. The trolley 411 has a limiting guide rail 4111 on both sides, the limiting guide rail 4111 comprises a free section 41111, a limiting section 41113 and a transition section 41112 connecting the free section 41111 and the limiting section 41113, the free section 41111 is located at one end of the transition section 41112 away from the heat treatment chamber 12, the height difference between the free section 41111 and the limiting plate 4132 is greater than the height difference between the limiting section 41113 and the separate limiting plate 4132, the guide wheel 4134 is slidably connected to the limiting guide rail 4111, when the guide wheel 4134 is located in the free section 41111, the return spring 4135 is in a free state, and the positioning pin 4133 is not inserted into the positioning hole 41321; when the guide wheel 4134 is located in the limiting section 41113, the return spring 4135 is in a compressed state, and the positioning pin 4133 is inserted into the positioning hole 41321.

[0060] Thus, the limiting assembly 413 is a pure mechanical structure, with low failure rate and easy maintenance. During loading, the trolley 411 is driven by the translation assembly 42 to slide into the heat treatment chamber 12, at this time, the linear bearing 4131 drives the positioning pin 4133 to slide into the heat treatment chamber 12, the guide wheel 4134 at the bottom of the positioning pin 4133 slides from the free section 41111 along the transition section 41112 into the limiting section 41113, so that the positioning pin 4133 gradually rises and inserts into the positioning hole 41321 of the limiting plate 4132, the fork 412 is driven by the limiting plate 4132 and the positioning pin 4133 to enter the heat treatment chamber 12 together with the trolley 411, realizing loading, when the trolley 411 is driven by the translation assembly 42 to retreat to the loading chamber 11, the guide wheel 4134 at the bottom of the positioning pin 4133 slides from the limiting section 41113 along the transition section 41112 into the free section 41111, the positioning pin 4133 is separated from the positioning hole 41321 under the action of the return spring 4135, and the fork 412 is separated from the trolley 411, thereby limiting the stroke of the fork 412. Similarly, during unloading, the limiting assembly 413 can also repeat the above movement process to limit the stroke of the fork 412.

[0061] In particular, in some embodiments, the positioning hole 41321 of the limiting plate 4132 is a waist-shaped hole, and the length direction of the waist-shaped hole is the same as the extension direction of the fiber guide rail. In this way, a certain allowance can be provided, so that the positioning pin 4133 is more easily inserted into the positioning hole 41321.

[0062] Further, as shown in Figure 11 and Figure 12 , in some embodiments, the outer furnace door assembly 20 includes a furnace door cylinder 21, a furnace door chain wheel 22, a furnace door chain 23, an outer furnace door 24, and a pair of furnace door guide rails 25, the furnace door cylinder 21 is fixedly arranged on the top of the outer shell 10, the furnace door chain wheel 22 is rotatably connected to the push rod 4341 of the furnace door cylinder 21, one end of the furnace door chain 23 is fixedly connected to the outer shell 10, the other end is fixedly connected to the outer furnace door 24, the furnace door chain 23 is engaged with the furnace door chain wheel 22, and the furnace door guide rails 25 are fixedly arranged on the outer shell 10. The two sides of the outer furnace door 24 are slidably connected to the furnace door guide rails 25. In this way, by driving the furnace door chain wheel 22 to move up and down by the furnace door cylinder 21, the outer furnace door 24 can slide up and down along the furnace door guide rails 25 under the drive of the furnace door chain 23, realizing opening and closing of the furnace door. The furnace door chain 23 and the furnace door chain wheel 22 cooperate to form a movable pulley structure, which can drive the outer furnace door 24 to rise and fall under a smaller distance and a smaller thrust, thereby saving the installation space of the three-chamber continuous vacuum heat treatment furnace.

[0063] Preferably, as shown in Figure 11 and Figure 12As shown, in some embodiments, the outer door assembly 20 further comprises a sealing member 26 arranged between the outer door 24 and the outer shell 10, and a plurality of pressing cylinders 27 respectively fixed to the door guide rails 25 for pressing the outer door 24. In this way, when the outer door 24 is closed, the outer door 24 can be pressed by the pressing cylinders 27 to improve the sealing performance of the charging port 111 and the discharging port 131.

[0064] On the other hand, as Figure 13 shown, the present application also provides an automatic heat treatment method, comprising the following steps:

[0065] S100, feeding materials into a heat treatment furnace by a feeding and discharging device;

[0066] S200, performing heat treatment on the materials by the heat treatment furnace to obtain a heat-treated product; and

[0067] S300, discharging the product from the heat treatment furnace by the feeding and discharging device.

[0068] Specifically, as Figure 14 and Figure 15 shown, in the above automatic heat treatment method, the step S100 of feeding materials into the heat treatment furnace by the feeding and discharging device comprises the following steps:

[0069] S110, opening an inner door of the heat treatment furnace located at a charging port;

[0070] S120, lifting the translation assembly and the fork assembly by the lifting assembly until the fork assembly reaches a high position;

[0071] S130, moving the fork assembly into the heat treatment furnace by the translation assembly until the fork assembly reaches a discharging position;

[0072] S140, lowering the translation assembly and the fork assembly by the lifting assembly until the fork assembly is placed on a hearth of the heat treatment furnace;

[0073] S150, lowering the translation assembly and the fork assembly by the lifting assembly until the fork assembly reaches a low position;

[0074] S160, moving the fork assembly into a charging chamber by the translation assembly until the fork assembly reaches a charging starting point; and

[0075] S170, closing the inner door of the heat treatment furnace located at the charging port.

[0076] And the step S300 of discharging the product from the heat treatment furnace by the feeding and discharging device comprises the following steps:

[0077] S310, opening an inner door of the heat treatment furnace located at a discharging port;

[0078] S320, lowering the translation assembly and the fork assembly by the lifting assembly until the fork assembly reaches a low position;

[0079] S330, moving the fork assembly into the heat treatment furnace by the translation assembly until the fork assembly reaches a product taking position;

[0080] S340, lowering the translation assembly and the fork assembly by the lifting assembly until the fork assembly takes the product from the hearth of the heat treatment furnace;

[0081] S350, lifting the translation assembly and the fork assembly by the lifting assembly until the fork assembly reaches a high position;

[0082] S360, moving the fork assembly into the unloading chamber by the translation assembly until the fork assembly reaches an unloading starting point; and,

[0083] S370, closing the inner furnace door of the heat treatment furnace at the unloading port.

[0084] It can be understood that, in the above automatic heat treatment method, the feeding position and the taking position are located above and below the hearth respectively, in the process of lowering the fork assembly by the lifting assembly, the fork assembly can place the material on the hearth of the heat treatment furnace, in the process of lifting the fork assembly by the lifting assembly, the fork assembly can take back the product from the hearth of the heat treatment furnace, through the cyclic work of the feeding and unloading device, the automatic heat treatment can be realized.

[0085] The technical features of the above-described embodiments can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present disclosure.

[0086] The above-described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A three-chamber continuous vacuum heat treatment furnace, characterized by, The application relates to a three-chamber continuous vacuum heat treatment furnace. The three-chamber continuous vacuum heat treatment furnace comprises a shell, two outer furnace door assemblies, a heat treatment furnace, and two feeding and discharging devices. The shell comprises an upper feeding chamber, a heat treatment chamber, and a lower discharging chamber arranged in sequence, the heat treatment chamber is provided with an upper feeding opening communicated with the upper feeding chamber and a lower discharging opening communicated with the lower discharging chamber, one side of the upper feeding chamber away from the upper feeding opening is provided with a feeding opening, and one side of the lower discharging chamber away from the lower discharging opening is provided with a discharging opening. The two outer furnace door assemblies are arranged at the feeding opening and the discharging opening respectively. The heat treatment furnace comprises a furnace body arranged in the heat treatment chamber and connected with the upper feeding opening and the lower discharging opening respectively, and two inner furnace door assemblies arranged in the upper feeding opening and the lower discharging opening respectively. The two feeding and discharging devices are arranged in the upper feeding chamber and the lower discharging chamber respectively, and each feeding and discharging device comprises a fork assembly, a translation assembly, and a lifting assembly. The translation assembly comprises a pair of sprocket assemblies arranged on both sides of the fork assembly, a transmission shaft, a pair of connecting assemblies, and a motor assembly.

2. The three chamber continuous vacuum thermal processing furnace of claim 1, wherein, Each sprocket assembly comprises a driving sprocket, a driven sprocket, and a transmission chain engaged with the driving sprocket and the driven sprocket.

3. The three chamber continuous vacuum thermal processing furnace of claim 2, wherein, Each connecting assembly comprises a transmission connector fixed to the transmission chain and a connecting bolt fixed to the fork assembly.

4. The three chamber continuous vacuum thermal processing furnace of claim 1, wherein, The connecting bolt is inserted into the transmission connector.

5. The three chamber continuous vacuum thermal processing furnace of claim 1, wherein, The transmission shaft is fixedly connected with the two driving sprockets. The motor assembly is drivably connected with the transmission shaft. The shell comprises a motor connecting part provided with a rotating shaft hole. The motor assembly is arranged outside the shell. The transmission shaft passes through the rotating shaft hole and is connected with the motor assembly. The three-chamber continuous vacuum heat treatment furnace comprises a radial sealing assembly. The radial sealing assembly comprises a shaft seal seat, an intermediate ring, a pair of skeleton sealing rings, a shaft seal cover, and an oil cup. The shaft seal seat is fixedly arranged on the motor connecting part and covers the transmission shaft. The intermediate ring is arranged in the shaft seal seat. The two skeleton sealing rings are arranged at both ends of the intermediate ring. The openings of the skeleton sealing rings are oppositely arranged. The shaft seal cover is fixedly arranged on the shaft seal seat to press the skeleton sealing rings and form an oil cavity between the intermediate ring and the transmission shaft. The shaft seal seat is provided with an oil inlet hole communicated with the oil cavity. The oil cup is arranged in the oil inlet hole. The motor assembly comprises a driving motor and a speed reduction assembly connected with the driving motor and the transmission shaft respectively. The lifting assembly comprises a support, a pair of lifting guide rails, a plurality of groups of guide bearings, and a lifting cylinder. The translation assembly is arranged on the support. The lifting guide rails are fixedly arranged on the shell in the up-down direction and are arranged on both sides of the support. A plurality of groups of guide bearings are arranged on both sides of the support in the up-down direction. Each group of guide bearings comprises two guide bearings. The lifting guide rails are provided with limiting grooves on both sides. The guide bearings are slidably arranged in the limiting grooves. The lifting cylinder is drivably connected with the support.

6. The three chamber continuous vacuum thermal processing furnace of claim 5, wherein, The shell comprises a cylinder connecting part with a push rod hole, the lifting assembly further comprises a cylinder seat fixed to the cylinder connecting part, a lifting cylinder fixed to the cylinder seat, and a push rod of the lifting cylinder drivingly connected to the support through the push rod hole.

7. The three chamber continuous vacuum thermal processing furnace of claim 6, wherein, The three-chamber continuous vacuum heat treatment furnace further comprises an axial sealing assembly, the axial sealing assembly comprises a sealing seat, a support ring, two groups of V-shaped sealing ring groups, a pressing ring, a pair of pressing covers and compression springs, the sealing seat is arranged between the shell and the push rod of the lifting cylinder, the support ring is arranged between the sealing seat and the push rod of the lifting cylinder, two groups of the V-shaped sealing ring groups are arranged at two ends of the support ring, each group of the V-shaped sealing ring groups comprises a plurality of V-shaped sealing rings, the V-shaped sealing rings in the two groups of the V-shaped sealing ring groups are oppositely arranged, the compression springs and the pressing ring are arranged at two ends of the two groups of the V-shaped sealing ring groups, and the two pressing covers are fixed at two ends of the sealing seat to compress the V-shaped sealing rings.

8. The three chamber continuous vacuum thermal processing furnace of claim 1, wherein, The fork assembly comprises a trolley, a fork and a pair of limiting assemblies, the translation assembly is drivingly connected to the trolley, the fork is slidably arranged on the trolley, and the limiting assemblies are arranged on two sides of the trolley and are limitingly connected to the fork to drive the fork to move when the trolley is driven by the translation assembly to move.

9. The three chamber continuous vacuum thermal processing furnace of claim 8, wherein, Each limiting assembly comprises a linear bearing fixed to the trolley, a limiting plate fixed to the fork and having a positioning hole, a positioning pin inserted into the linear bearing, a guide wheel rotatably connected to the bottom of the positioning pin, and a return spring arranged between the positioning pin and the linear bearing, two sides of the trolley are provided with limiting guide rails, the limiting guide rails comprise a free section, a limiting section and a transition section connecting the free section and the limiting section, the free section is located at one end of the transition section away from the heat treatment chamber, the height difference between the free section and the limiting plate is greater than the height difference between the limiting section and the separate limiting plate, the guide wheel is slidably connected to the limiting guide rail, when the guide wheel is located in the free section, the return spring is in a free state, and the positioning pin is not inserted into the positioning hole; when the guide wheel is located in the limiting section, the return spring is in a compressed state, and the positioning pin is inserted into the positioning hole.

10. The three chamber continuous vacuum thermal processing furnace of claim 1, wherein, The outer furnace door assembly comprises a furnace door cylinder, a furnace door sprocket, a furnace door chain, an outer furnace door and a pair of furnace door guide rails, the furnace door cylinder is fixed to the top of the shell, the furnace door sprocket is rotatably connected to the push rod of the furnace door cylinder, one end of the furnace door chain is fixed to the shell, the other end is fixed to the outer furnace door, the furnace door chain is engaged with the furnace door sprocket, the furnace door guide rails are fixed to the shell, and two sides of the outer furnace door are slidably connected to the furnace door guide rails.

11. The three chamber continuous vacuum thermal processing furnace of claim 10, wherein, The outer furnace door assembly further comprises a sealing member arranged between the outer furnace door and the outer shell, and a plurality of pressing cylinders respectively fixed to the furnace door guide rails for pressing the outer furnace door.

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