A heat treatment furnace with quenching oil filtering device

Abstract

This invention discloses a heat treatment furnace with a quenching oil filtration device, relating to the field of quenching oil filtration. It solves the problem that existing devices are unable to perform dual filtration and secondary utilization of impurities in quenching oil according to requirements, and adopts the following solution: It includes a heat treatment furnace body and a filtration assembly; the inner side of the filtration assembly is provided with a pre-filtration mechanism and a secondary filtration mechanism from top to bottom. The secondary filtration mechanism includes a fast-rotating component and a slow-rotating component above it. The fast-rotating component is used for secondary filtration of the corresponding oil. This heat treatment furnace with a quenching oil filtration device, through the pre-filtration mechanism and the secondary filtration mechanism inside the filtration assembly, enables the pre-filtration mechanism to perform coarse filtration of the injected quenching oil, and then the secondary filtration mechanism to perform secondary fine filtration of the quenching oil after coarse filtration, thereby achieving efficient dual filtration and secondary utilization of the quenching oil discharged from the heat treatment furnace body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quenching oil filtering, in particular to a heat treatment furnace with quenching oil filtering device. BACKGROUND

[0002] Quenching oil is an indispensable key medium in the heat treatment process, and is widely used in the quenching link of various metal workpieces. Heat treatment is an important heat processing technology that relies on precise control means such as heating, holding and cooling under the condition of material solid state, aiming to give the metal material the expected microstructure and mechanical properties. In the actual production process, the process needs to be cooperated with the core equipment of the heat treatment furnace. The heat treatment furnace covers electric furnaces using electric energy as heat source, and fuel furnaces using coal, oil, gas and other fuels, which can provide heating environment required by metal workpieces for annealing, quenching, tempering, normalizing and chemical heat treatment;

[0003] During the continuous operation of the heat treatment furnace, the quenching oil will inevitably adsorb and trap impurities such as metal scraps, oxide scales and dust particles with different shapes and sizes due to frequent contact with high-temperature metal workpieces and long-term circulation. In order to implement sustainable use of resources, reduce production cost, and at the same time ensure the stability of quenching process and the consistency of product quality, it is particularly important to implement efficient filtering and purification of quenching oil and realize recycling;

[0004] At present, microfiltration membranes are generally used as the core component for quenching oil filtering in the industry. However, due to the wide distribution of impurity particle size in quenching oil, the traditional method of directly filtering by single microfiltration membrane exposes significant drawbacks: a large amount of impurities quickly accumulate on the membrane surface to form a filter cake layer, causing the filtration resistance to rise sharply, not only greatly shortening the effective service life of the microfiltration membrane, but also forcing the operator to frequently replace the filter material, significantly increasing the labor maintenance cost and downtime frequency; moreover, problems such as filter hole blockage and permeation flux decay are prone to occur, resulting in low quenching oil filtering efficiency and poor purification effect, which is difficult to meet the strict requirements of modern heat treatment production line on medium purity.

[0005] Therefore, we propose a heat treatment furnace with quenching oil filtering device. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application provides a heat treatment furnace with quenching oil filtering device, which solves the problem that the existing device cannot double-filter and reuse the impurities in quenching oil according to the needs.

[0007] To achieve the above purpose, the present application realizes the following technical scheme: a heat treatment furnace with quenching oil filtering device, comprising a heat treatment furnace body and a filtering assembly outside the heat treatment furnace body, the filtering assembly is used for filtering and corresponding secondary utilization of the oil discharged from the heat treatment furnace body;

[0008] The inner side of the filter assembly is provided with a pre-filtering mechanism from top to bottom and a secondary filtering mechanism, the pre-filtering mechanism is used for pre-filtering the injected quenching oil, the secondary filtering mechanism includes a fast rotating assembly and a slow rotating assembly above the fast rotating assembly, the fast rotating assembly is used for secondary filtering the corresponding oil body, and the slow rotating assembly is used for uniformly discharging the quenching oil.

[0009] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the filter assembly includes a filter cylinder and a top plate installed at the top of the filter cylinder, the top of the top plate is provided with an oil injection tank, the output end of the heat treatment furnace body is provided with an oil discharge pipe located at the top of the oil injection tank, the bottom of the filter assembly is provided with an oil discharge tank serving as the output end of the filter assembly, and the filter assembly is provided with an oil return pipe serving as the secondary utilization input end and connected with the oil discharge tank.

[0010] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the inner side of the filter cylinder is provided with a support disc, the outer wall of the filter assembly is provided with a slag discharge hole opposite to the output end position of the pre-filtering mechanism, and the inner side of the filter cylinder is provided with a helical gear engaged in the secondary filtering mechanism.

[0011] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the pre-filtering mechanism includes an upper filter tank arranged in the inner side of the filter assembly, the upper filter tank is a double-layer tank, a filter rib tank is arranged in the top layer of the upper filter tank, the bottom end of the upper filter tank is provided with a guide oil groove located between the inner tank and the outer tank, and the upper filter tank is connected with the pre-filtering mechanism at the bottom side through the guide oil groove.

[0012] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the pre-filtering mechanism further includes a gear disc arranged at the bottom side of the top of the filter assembly, the outer side of the gear disc is engaged with a gear seat, the middle part of the gear seat is sleeved with a guide oil pipe, the filter assembly is provided with a micro motor connected with the gear disc at the output bottom end, and the bottom end of the guide oil pipe is connected with a bent oil pipe located above the upper filter tank.

[0013] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the top of the upper filter tank is provided with a billiard ball opposite to the outer end position of the bent oil pipe, the bottom end of the guide oil pipe is connected with a support column, the bottom end of the support column is connected with a rotating column located in the inner side of the bottom end of the upper filter tank, the outer wall of the rotating column is provided with three groups of fan blades arranged in a ring shape, and the inner side of the bottom end of the upper filter tank is provided with a guide slag groove located outside the rotating column and the slag discharge groove.

[0014] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the outer side of the bottom end of the upper filtering hopper is provided with a foreign matter discharging groove, the foreign matter discharging groove is communicated with the foreign matter guiding groove, the foreign matter discharging groove is an arc-shaped groove, the bottom end of the oil guiding groove is fixedly connected with a support column, and the outer wall of the support column is fixedly connected with a scraper plate in the form of a ring and being pressed on the top surface of the upper filtering hopper.

[0015] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the secondary filtering mechanism comprises a fast rotating assembly installed on the inner wall of the filtering assembly and a slow rotating assembly rotatably assembled on the top of the fast rotating assembly, and the fast rotating assembly and the slow rotating assembly are engaged and assembled on the inner side of the filtering assembly.

[0016] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the fast rotating assembly comprises a driving motor installed on the inner wall of the filtering assembly, a support is installed on the top of the driving motor, a lower filtering hopper is connected to the top end of the output shaft of the support, a lower gear ring is installed at the top edge of the lower filtering hopper, and a hopper-shaped micro-filtration membrane is laid on the top of the lower filtering hopper.

[0017] As a preferred scheme of the heat treatment furnace with the quenching oil filtering device, the slow rotating assembly comprises an oil distribution pipe connected to the output end on the bottom side of the pre-filtering mechanism, the oil distribution pipe is a four-way pipe, the top end of the oil distribution pipe is rotatably sleeved on the bottom end of the output shaft of the pre-filtering mechanism through a bearing column, an oil hole is formed in the outer wall of the bottom end of the oil distribution pipe and located above the hopper surface of the lower filtering hopper in the fast rotating assembly, and an upper gear ring is installed on the outer wall of the oil distribution pipe.

[0018] The application provides a heat treatment furnace with a quenching oil filtering device.

[0019] 1. The heat treatment furnace with the quenching oil filtering device can pre-filter the injected quenching oil through the pre-filtering mechanism and the secondary filtering mechanism in the filtering assembly, pre-filter the quenching oil filtered by the pre-filtering mechanism again through the secondary filtering mechanism, realize efficient double filtering and secondary utilization of the quenching oil discharged from the heat treatment furnace body, and solve the problem that the existing device cannot double filter and secondarily utilize the impurities in the quenching oil according to the requirement.

[0020] 2. The heat treatment furnace with the quenching oil filtering device can drive the oil injection part on the pre-filtering mechanism through the structure of the pre-filtering mechanism, inject the quenching oil uniformly into the pre-filtering mechanism, pre-filter the impurities in the quenching oil uniformly, and extrude the filtered impurities outward, so as to achieve the effect of pre-filtering and impurity removal of the quenching oil.

[0021] 3. The heat treatment furnace with quenching oil filtering device, through the setting of the secondary filtering mechanism structure, the quenching oil after rough filtering can be uniformly discharged and placed in the component, and through the setting of the inner side engagement assembly, the rotating speed difference of the top and bottom components is large, and the rotating directions are opposite, so that the oil is uniformly sent and high-efficiency filtering effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the application;

[0023] Figure 2 It is a structural schematic diagram of the filtering assembly of the application;

[0024] Figure 3 It is a structural schematic diagram of the inner side of the filtering assembly of the application;

[0025] Figure 4 It is a structural schematic diagram of the pre-filtering assembly of the application;

[0026] Figure 5 It is a structural schematic diagram of the inner side of the pre-filtering assembly of the application;

[0027] Figure 6 It is a structural schematic diagram of the application Figure 5 It is an enlarged structural schematic diagram of A in the application;

[0028] Figure 7 It is a structural schematic diagram of the upper filtering hopper of the application;

[0029] Figure 8 It is a structural schematic diagram of the secondary filtering mechanism of the application;

[0030] Figure 9 It is a structural schematic diagram of the slow rotating assembly.

[0031] In the figure: 1, heat treatment furnace; 2, oil discharge pipe; 3, oil return pipe; 4, filtering assembly; 41, filtering cylinder; 42, top plate; 43, oil injection hopper; 44, impurity discharge hole; 45, oil discharge hopper; 46, micro motor; 47, support disc; 48, bevel gear; 5, pre-filtering mechanism; 51, upper filtering hopper; 511, filtering rib hopper; 512, billiard ball; 513, oil guide groove; 514, impurity guide groove; 515, rotating column; 516, impurity discharge groove; 517, fan blade; 52, gear plate; 53, gear seat; 54, oil guide pipe; 55, oil bending pipe; 56, scraper; 57, support column; 6, secondary filtering mechanism; 61, fast rotating assembly; 611, driving motor; 612, support; 613, lower filtering hopper; 614, lower gear ring; 62, slow rotating assembly; 621, oil distribution pipe; 622, bearing column; 623, oil hole; 624, upper gear ring. DETAILED DESCRIPTION

[0032] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0033] Please refer to Figures 1-9 The embodiment of the present application provides a technical solution: a heat treatment furnace with quenching oil filtering device, comprising a heat treatment furnace body 1 and a filtering assembly 4 outside the heat treatment furnace body 1, the filtering assembly 4 is used for filtering and corresponding secondary utilization of the oil body discharged by the heat treatment furnace body 1; the inner side of the filtering assembly 4 is provided from top to bottom with a pre-filtering mechanism 5 and a secondary filtering mechanism 6, the pre-filtering mechanism 5 is used for pre-filtering the injected quenching oil, and the secondary filtering mechanism 6 comprises a fast rotating assembly 61 and a slow rotating assembly 62 above the fast rotating assembly 61, the fast rotating assembly 61 is used for secondary filtering of the corresponding oil body, and the slow rotating assembly 62 is used for uniform discharge of the quenching oil.

[0034] Among them, through the setting of the pre-filtering mechanism 5 and the secondary filtering mechanism 6 in the filtering assembly 4, the injected quenching oil can be pre-filtered by the pre-filtering mechanism 5, and the quenching oil filtered by the pre-filtering mechanism 5 can be secondary filtered by the secondary filtering mechanism 6, so as to realize the effect of efficient double filtering and secondary utilization of the quenching oil discharged by the heat treatment furnace body 1, and solve the problem that the existing device is difficult to double filter and secondary utilize the impurities in the quenching oil according to the demand;

[0035] Through the setting of the structure of the pre-filtering mechanism 5, the oil injection part on the pre-filtering mechanism 5 can be driven by the filtering assembly 4, and the quenching oil can be uniformly injected into the pre-filtering mechanism 5, so as to uniformly pre-filter the impurities in the quenching oil, and the filtered impurities can also be extruded outward, so as to achieve the effect of corresponding pre-filtering and impurity removal of the quenching oil;

[0036] Through the setting of the structure of the secondary filtering mechanism 6, the coarsely filtered quenching oil can be driven by the components in the secondary filtering mechanism 6 to be uniformly discharged therein, and the components meshed and assembled in the inner side can have a large difference in rotating speed and opposite rotating directions at the top and bottom, so as to achieve the effect of uniform oil feeding and efficient filtering.

[0037] Embodiment 2: In order to realize the corresponding installation of the pre-filtering mechanism 5, please refer to Figure 2 and 3, the filter assembly 4 comprises a filter cylinder 41 and a top plate 42 installed on the top of the filter cylinder 41, the top of the top plate 42 is equipped with an oil injection tank 43, the output end of the heat treatment furnace body 1 is installed with an oil discharge pipe 2 located at the top of the oil injection tank 43, the bottom of the filter assembly 4 is provided with an oil discharge tank 45 as the output end thereof, and the filter assembly 4 is provided with an oil return pipe 3 connected with the oil discharge tank 45 as the secondary utilization input end thereof;

[0038] The oil discharge pipe 2 is arranged to facilitate the delivery of the quenching oil in the heat treatment furnace body 1 to the pre-filtering mechanism 5 on the inside of the filter assembly 4 for rough filtering, and the secondary filtering mechanism 6 is used to perform fine filtering on the rough filtered quenching oil output by the pre-filtering mechanism 5, thereby achieving the effect of double filtering of the quenching oil, and the automatic degree is high, and efficient double filtering and secondary utilization of the quenching oil can be realized.

[0039] The inside of the filter cylinder 41 is installed with a support disc 47, the outer wall of the filter assembly 4 is provided with a foreign matter discharge hole 44 opposite to the output position of the pre-filtering mechanism 5, and the inside of the filter cylinder 41 is installed with a helical gear 48 engaged in the secondary filtering mechanism 6;

[0040] The foreign matter discharge hole 44 is arranged opposite to the output position in the pre-filtering mechanism 5, so that efficient discharge of solid impurities discharged by the pre-filtering mechanism 5 can be realized, and the helical gear 48 is arranged to assist the reverse rotation of the fast rotating assembly 61 and the slow rotating assembly 62 in the secondary filtering mechanism 6, and the rotating speed of the fast rotating assembly 61 is fast, and the rotating speed of the slow rotating assembly 62 is slow, so that the quenching oil discharged on the slow rotating assembly 62 is uniformly injected on the microfiltration membrane on the inside of the fast rotating assembly 61, thereby assisting the microfiltration membrane to perform efficient filtering and purification.

[0041] In order to achieve the effect of rough filtering of the quenching oil discharged by the heat treatment furnace body 1, please refer to Figures 4-7 The pre-filtering mechanism 5 comprises an upper filter hopper 51 arranged on the inside of the filter assembly 4, the upper filter hopper 51 is a double-layer hopper, the filter rib hopper 511 is installed in the top layer of the upper filter hopper 51, the bottom end of the upper filter hopper 51 is provided with a oil guide groove 513 located between the inner and outer hoppers, and the upper filter hopper 51 is communicated with the pre-filtering mechanism 5 on the bottom side through the oil guide groove 513;

[0042] The double-layer hopper of the upper filter hopper 51 is arranged to perform rough filtering by the filter rib hopper 511 on the top surface thereof, and the rough filtered oil body is output downward to the oil guide groove 513 along the gap between the top hopper and the bottom hopper in the upper filter hopper 51, and the rough filtered oil body is delivered to the secondary filtering mechanism 6, thereby achieving the effects of rough filtering of the quenching oil and automatic output.

[0043] The pre-filtering mechanism 5 further comprises a gear disc 52 installed on the bottom side of the top of the filtering assembly 4, the outer side of the gear disc 52 is engaged with a gear seat 53, the middle part of the gear seat 53 is sleeved with an oil guide pipe 54, the filtering assembly 4 is provided with a micro motor 46 with the output bottom end connected to the gear disc 52, and the bottom end of the oil guide pipe 54 is connected with a bent oil pipe 55 located above the upper filtering hopper 51;

[0044] The micro motor 46 is arranged to facilitate the rotation of the bent oil pipe 55 in the pre-filtering mechanism 5, thereby uniformly delivering the quenching oil to the upper filtering hopper 51, which ensures efficient coarse filtration of the quenching oil. The bent oil pipe 55 is bent and arranged on the top side of the upper filtering hopper 51, which assists in uniformly delivering the quenching oil to the upper filtering hopper 51.

[0045] The top of the upper filtering hopper 51 is provided with a billiard ball 512 opposite the outer end position of the bent oil pipe 55, the bottom end of the oil guide pipe 54 is connected with a support column 57, the bottom end of the support column 57 is connected with a rotating column 515 located on the inner side of the bottom end of the upper filtering hopper 51, and the outer wall of the rotating column 515 is provided with three groups of fan blades 517 arranged in a ring shape, and the inner side of the bottom end of the upper filtering hopper 51 is provided with a foreign matter guide groove 514 located on the outer side of the rotating column 515 and the foreign matter discharge groove 516;

[0046] The billiard ball 512 is arranged to contact and hit the bent oil pipe 55 when it rotates, and at the same time, the upper filtering hopper 51 top surface is vibrated, thereby making the impurities adhered to the filtering rib 511 on the top surface vibrate, and the rotating column 515 is arranged to drive the fan blades 517 on the outer wall thereof to rotate synchronously, so that the impurities accumulated in the foreign matter guide groove 514 are moved out, and in combination with the arrangement of the foreign matter discharge groove 516, the impurities accumulated therein can be efficiently discharged.

[0047] The outer side of the bottom end of the upper filtering hopper 51 is provided with the foreign matter discharge groove 516, the foreign matter discharge groove 516 is in communication with the foreign matter guide groove 514, the foreign matter discharge groove 516 is an arc-shaped groove, the bottom end of the oil guide pipe 54 is fixedly connected with the support column 57, and the outer wall of the support column 57 is fixedly connected with the scraper 56 arranged in a ring shape and pressed on the top surface of the upper filtering hopper 51;

[0048] The support column 57 and the scraper 56 thereon are arranged to scrape the impurities accumulated thereon when rotating, and the impurities are scraped to the inner side of the bottom end of the upper filtering hopper 51, so as to be efficiently discharged in combination with the subsequent arrangement of the foreign matter discharge groove 516.

[0049] In order to achieve the effect of fine filtering of the coarsely filtered quenching oil, please refer to Figure 8 and 9The secondary filtering mechanism 6 comprises a fast rotating assembly 61 installed on the inner wall of the filtering assembly 4 and a slow rotating assembly 62 rotatably assembled on the top of the fast rotating assembly 61, and the fast rotating assembly 61 and the slow rotating assembly 62 are engaged and assembled on the inner side of the filtering assembly 4;

[0050] The fast rotating assembly 61 and the slow rotating assembly 62 are engaged and assembled through the bevel gear 48, when the fast rotating assembly 61 is driven to rotate fast, the slow rotating assembly 62 is driven by the bevel gear 48 to rotate reversely with the fast rotating assembly 61, and the rotating speed of the slow rotating assembly 62 is slower, so that the discharged quenching oil can be uniformly laid on the fast rotating assembly 61, and efficient filtering of the quenching oil can be ensured.

[0051] The fast rotating assembly 61 comprises a driving motor 611 installed on the inner wall of the filtering assembly 4, a bracket 612 installed on the top of the driving motor 611, a lower filtering hopper 613 connected to the top end of the output shaft of the bracket 612, a lower gear ring 614 installed on the top edge of the lower filtering hopper 613, and a hopper-shaped micro-filtration membrane laid on the top of the lower filtering hopper 613.

[0052] The micro-filtration membrane arranged on the fast rotating assembly 61 can ensure further efficient filtering of the coarsely filtered quenching oil, and the lower filtering hopper 613 and the upper and lower gear rings 614 arranged thereon can facilitate the rotation of the slow rotating assembly 62 arranged thereon, so as to achieve the effects of efficient oil laying and further efficient filtering.

[0053] The slow rotating assembly 62 comprises an oil distribution pipe 621 connected to the output end on the bottom side of the pre-filtering mechanism 5, the oil distribution pipe 621 is a four-way pipe, the top end of the oil distribution pipe 621 is rotatably sleeved on the bottom end of the output shaft of the pre-filtering mechanism 5 through a bearing column 622, an oil hole 623 is formed in the outer wall of the bottom end of the oil distribution pipe 621 and located above the hopper face of the lower filtering hopper 613 of the fast rotating assembly 61, and an upper gear ring 624 is installed on the outer wall of the oil distribution pipe 621.

[0054] The structure of the slow rotating assembly 62 facilitates output of three groups of oil, and the oil hole 623 can be matched with the upper and lower gear rings 614 of the fast rotating assembly 61, so that the bevel gear 48 can be used to drive the fast rotating assembly 61 and the slow rotating assembly 62 to rotate reversely at different speeds, and efficient filtering and subsequent secondary use of the quenching oil can be ensured.

[0055] The working principle and use process of the present application: through the setting of the filter assembly 4, the quenching oil discharged by the oil discharge pipe 2 can be accepted by the pre-filtering mechanism 5 inside it, and the oil pipe 55 in the pre-filtering mechanism 5 is driven to rotate by the micro motor 46 on the filter assembly 4, so that the quenching oil is placed in the upper filter hopper 51 on the pre-filtering mechanism 5 for rough filtering, wherein the impurities after rough filtering are transported to the secondary filtering mechanism 6 through the gap in the upper filter hopper 51 and the oil guide groove 513, while the impurities adhere to the upper filter hopper 51, and the impurities on the upper filter hopper 51 are shaken by the impact of the billiard ball 512 during the rotation of the oil pipe 55, while the impurities slowly enter the impurity guide groove 514 inside the bottom end of the upper filter hopper 51 under the rotation and scraping of the scraper 56 driven, and the fan blade 517 is driven to rotate by the rotating column 515, extruding the impurities therein, and the impurities are discharged through the impurity discharge groove 516, while the oil body after rough filtering is transported to the oil distribution pipe 621 in the slow rotation assembly 62 below, and the oil hole 623 at the bottom end slowly discharges the oil body to the microfiltration membrane on the lower filter hopper 613, which performs fine filtering on the oil body after rough filtering, while the driving motor 611 in the fast rotation assembly 61 drives the fast rotation assembly 61 to rotate fast, and the slow rotation assembly 62 is synchronously driven to rotate slowly in the opposite direction by the bevel gear 48, so as to achieve fine filtering of the quenching oil after rough filtering and ensure efficient filtering of the quenching oil.

[0056] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0057] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A heat treatment furnace having a quenching oil filtering device, characterized by: The application relates to a heat treatment furnace body (1) and a filter assembly (4) outside the heat treatment furnace body (1), which is used for filtering and corresponding secondary utilization of oil discharged from the heat treatment furnace body (1). An inner side of the filter assembly (4) is provided with a pre-filtering mechanism (5) and a secondary filtering mechanism (6) from top to bottom, the pre-filtering mechanism (5) is used for pre-filtering injected quenching oil, and the secondary filtering mechanism (6) comprises a fast rotating assembly (61) and a slow rotating assembly (62) above the fast rotating assembly (61), the fast rotating assembly (61) is used for secondary filtering of corresponding oil, and the slow rotating assembly (62) is used for uniformly discharging quenching oil. The pre-filtering mechanism (5) comprises an upper filter hopper (51) arranged on the inner side of the filter assembly (4), the upper filter hopper (51) is a double-layer hopper, a filter rib hopper (511) is arranged in the top layer of the upper filter hopper (51), the bottom end of the upper filter hopper (51) is provided with an oil guide groove (513) between the inner and outer hoppers, and the upper filter hopper (51) is connected with the pre-filtering mechanism (5) on the bottom side in a communication mode through the oil guide groove (513). The pre-filtering mechanism (5) further comprises a gear disc (52) arranged on the bottom side of the top of the filter assembly (4), the outer side of the gear disc (52) is engaged with a gear seat (53), the middle part of the gear seat (53) is sleeved with an oil guide pipe (54), the filter assembly (4) is provided with a micro motor (46) with an output bottom end connected with the gear disc (52), the bottom end of the oil guide pipe (54) is connected with a bent oil pipe (55) above the upper filter hopper (51). The top of the upper filter hopper (51) is provided with a billiard ball (512) opposite to the outer end position of the bent oil pipe (55), the bottom end of the oil guide pipe (54) is connected with a support column (57), the bottom end of the support column (57) is connected with a rotating column (515) on the inner side of the bottom end of the upper filter hopper (51), the outer wall of the rotating column (515) is arranged with three groups of fan blades (517) in an annular distribution, and the inner side of the bottom end of the upper filter hopper (51) is provided with a foreign matter guide groove (514) on the outer side of the rotating column (515) and a foreign matter discharging groove (516). The secondary filtering mechanism (6) comprises the fast rotating assembly (61) arranged on the inner wall of the filter assembly (4) and the slow rotating assembly (62) rotatably arranged on the top of the fast rotating assembly (61), and the fast rotating assembly (61) and the slow rotating assembly (62) are engaged and assembled on the inner side of the filter assembly (4). The fast rotating assembly (61) comprises a driving motor (611) arranged on the inner wall of the filter assembly (4), the top of the driving motor (611) is arranged with a support (612), the top end of the output shaft of the support (612) is connected with a lower filter hopper (613), the top edge of the lower filter hopper (613) is arranged with a lower gear ring (614), and the top of the lower filter hopper (613) is paved with a hopper-shaped micro filter membrane. The slow rotating assembly (62) comprises an oil distribution pipe (621) connected to the output end of the pre-filtering mechanism (5), the oil distribution pipe (621) is a four-way pipe, the top end of the oil distribution pipe (621) is rotatably sleeved with the bottom end of the output shaft of the pre-filtering mechanism (5) through a bearing column (622), an oil hole (623) is arranged on the outer wall of the bottom end of the oil distribution pipe (621) and located above the surface of the lower filtering hopper (613) in the fast rotating assembly (61), and an upper gear ring (624) is mounted on the outer wall of the oil distribution pipe (621).

2. The heat treatment furnace having a quenching oil filtering device according to claim 1, characterized in that: The filtering assembly (4) comprises a filtering cylinder (41) and a top plate (42) mounted on the top of the filtering cylinder (41), an oil injection hopper (43) is arranged on the top of the top plate (42), an oil discharge pipe (2) is arranged on the output end of the heat treatment furnace body (1) and located on the top of the oil injection hopper (43), an oil discharge hopper (45) is arranged on the bottom of the filtering assembly (4) and serves as the output end of the filtering assembly (4), and an oil return pipe (3) is arranged on the filtering assembly (4) and serves as the input end of the filtering assembly (4) and is connected with the oil discharge hopper (45).

3. The heat treatment furnace having a quenching oil filtering device according to claim 2, characterized in that: A supporting disc (47) is mounted on the inner side of the filtering cylinder (41), a foreign matter discharge hole (44) is arranged on the outer wall of the filtering assembly (4) and opposite to the output end of the pre-filtering mechanism (5), and a helical gear (48) is mounted on the inner side of the filtering cylinder (41) and engaged in the secondary filtering mechanism (6).

4. The heat treatment furnace having a quenching oil filtering device according to claim 1, characterized in that: An arc-shaped foreign matter discharge groove (516) is arranged on the outer side of the bottom end of the upper filtering hopper (51), the foreign matter discharge groove (516) is connected with the foreign matter guide groove (514), the foreign matter discharge groove (516) is an arc-shaped groove, a supporting column (57) is fixedly connected to the bottom end of the oil guide pipe (54), and a scraper (56) in the form of a ring is fixedly connected to the outer wall of the supporting column (57) and press-fitted on the top surface of the upper filtering hopper (51).

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