Nitriding furnace for cylinder liner treatment

Abstract

The invention relates to the field of nitriding furnaces, in particular to a nitriding furnace for treating cylinder liners, comprising a closing mechanism, which is used for closing and sealing the entire device; an exhaust mechanism, which is used for exhausting oxygen inside the device; a heating mechanism, which is used for heating the furnace; and a nitriding mechanism, which is used for nitriding the surface of the cylinder liners; an external furnace is arranged below the closing mechanism, and the nitriding furnace for treating the cylinder liners, through a rotating shaft fixedly connected to the inner side of a first gear, will rotate with a second limiting sleeve, and finally the first batch of cylinder liners will rotate with the second limiting sleeve, so that the rotation of the first batch of cylinder liners can make various parts of the cylinder liners more evenly exposed to the high temperature environment in the furnace, avoiding the situation of local overheating or insufficient temperature, thereby ensuring the consistency of the nitriding effect.

Description

Technical Field

[0001] The invention relates to the technical field of nitriding furnaces, in particular to a nitriding furnace for treating a cylinder liner. Background Art

[0002] Nitriding furnace is an industrial equipment used for nitriding treatment of metal materials. It has the characteristics of low treatment temperature, short time, small deformation of workpiece, high fatigue limit and good wear resistance.

[0003] Nitriding is a process that penetrates nitrogen atoms into the metal surface at a certain temperature to form a nitride layer, thereby improving the metal surface hardness, wear resistance, corrosion resistance, fatigue strength and other properties.

[0004] There are several problems with the existing nitriding furnaces for cylinder liner processing: 1. Oxidation problem: If there is too much oxygen in the atmosphere in the furnace, it may cause oxidation of the mold surface and affect the quality of the nitriding layer; 2. Uneven nitriding layer: Due to uneven gas flow distribution, improper placement of the cylinder liner in the furnace or uneven temperature in the furnace, the thickness and hardness of the nitriding layer on the surface of the cylinder liner are inconsistent. Summary of the invention

[0005] The present invention provides a nitriding furnace for treating a cylinder liner to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a nitriding furnace for treating a cylinder liner, comprising a sealing mechanism, the sealing mechanism being used for sealing and sealing the entire device;

[0007] An exhaust mechanism, which is used to exhaust oxygen inside the device;

[0008] A heating mechanism, which is used to heat the furnace;

[0009] A nitriding mechanism, the nitriding mechanism is used to perform nitriding treatment on the surface of the cylinder liner;

[0010] An external furnace is arranged below the sealing mechanism, the exhaust mechanism and the heating mechanism are both fixedly installed inside the external furnace, a built-in furnace is arranged at the center of the inner cavity of the external furnace, and the nitriding mechanism is arranged inside the built-in furnace;

[0011] The nitriding mechanism comprises a cross-bar frame, the top of the cross-bar frame is fixedly connected to a lifting ring, the bottom of the cross-bar frame is fixedly connected to a No. 1 support column, the bottom of the No. 1 support column is fixedly connected to a No. 1 support plate, the bottom of the No. 1 support plate is plugged with a No. 2 support column, the bottom of the No. 2 support column is fixedly connected to a No. 2 support plate, and the top of the No. 2 support plate is fixedly connected to a perforated plate;

[0012] A No. 1 limiting sleeve is arranged above the No. 1 supporting plate, a fixing sleeve is fixedly connected to the bottom of the No. 1 limiting sleeve, the bottom of the fixing sleeve is rotatably connected to the No. 1 supporting plate, a vertical rod is fixedly connected to the center of the bottom of the fixing sleeve, and a No. 2 limiting sleeve is extruded and adapted to the bottom of the vertical rod.

[0013] Preferably, the closing mechanism includes a top ring, the bottom of which is fixedly connected to the top of the built-in furnace, the outer side of the top ring is fixedly connected to an embedded ring, the top of the embedded ring is clamped with a sealing cover, the top of the sealing cover is sleeved with a pressure relief nozzle, the outer side of the sealing cover is extruded and fitted with the external furnace, the top of the external furnace is provided with a top groove, and the inner wall of the top groove is embedded with the sealing cover.

[0014] Preferably, a hole groove is opened on the inner side of the top ring, and a curved block is slidably adapted inside the hole groove. The outer side of the curved block is extruded and adapted with the blocking cover, and an insert plate is extruded and adapted with the end of the curved block away from the blocking cover. The insert plate is inserted into the bottom of the top ring and extends to the top. A spring is fixedly connected to the outer side of the insert plate, and the top end of the spring is fixedly connected to the outer side of the top ring, and the top end of the insert plate is snap-fitted with the bottom of the blocking cover.

[0015] Preferably, the heating mechanism includes an external plate, which is fixedly connected to the outside of the built-in furnace, the bottom of the external plate is extruded with a T-block, the bottom of the T-block is provided with a heating component, the heating component is sleeved on the outside of the external furnace, the top of the T-block is fixedly connected with an elastic bar, the top of the elastic bar is fixedly connected with a fixed plate, and the fixed plate is fixedly connected to the inside of the external furnace.

[0016] Preferably, the exhaust mechanism includes a No. 1 dredge pipe, which is respectively sleeved on the outside of the external furnace and the internal furnace, and a vacuum pump is fixedly installed on the end of the No. 1 dredge pipe close to the external furnace, and a No. 1 perforated disk is fixedly connected to the inside of the No. 1 dredge pipe, and a No. 1 connecting rod is inserted in the center of the No. 1 perforated disk, and a half-block is fixedly connected to the end of the No. 1 connecting rod away from the No. 1 perforated disk.

[0017] Preferably, the end of the No. 1 connecting rod away from the half-block is fixedly connected to the No. 1 blocking block, the outer side of the No. 1 blocking block is respectively fixedly connected to a No. 1 embedded column and a No. 1 slide plate, the outer side of the No. 1 embedded column is clamped with the No. 1 perforated disk, the inner side of the No. 1 slide plate is fixedly connected to a No. 1 return spring, and the end of the No. 1 return spring away from the No. 1 slide plate is fixedly connected to the No. 1 perforated disk.

[0018] Preferably, the heating assembly includes a No. 2 dredge pipe, the top of which is plugged into a T-block, and the No. 2 dredge pipe is respectively sleeved on the outside of the external furnace and the built-in furnace, a heating element is fixedly installed on the end of the No. 2 dredge pipe away from the built-in furnace, a No. 2 perforated disk is fixedly connected to the inside of the No. 2 dredge pipe, a No. 2 connecting rod is plugged into the center of the No. 2 perforated disk, and a notch block is fixedly connected to the end of the No. 2 connecting rod away from the No. 2 perforated disk.

[0019] Preferably, the end of the No. 2 connecting rod away from the notch block is fixedly connected to the No. 2 blocking block, the outer side of the No. 2 blocking block is respectively fixedly connected with a No. 2 embedded column and a No. 2 slide plate, the outer side of the No. 2 embedded column is clamped with the No. 2 perforated disk, the inner side of the No. 2 slide plate is fixedly connected with a No. 2 return spring, and the end of the No. 2 return spring away from the No. 2 slide plate is fixedly connected to the No. 2 perforated disk.

[0020] Preferably, the bottom of the No. 2 limiting sleeve is fixedly connected to a rotating shaft, the outer side of the rotating shaft is rotatably connected to the perforated disk, a No. 1 gear is provided below the perforated disk, the inner side of the No. 1 gear is fixedly connected to the rotating shaft, the outer side of the No. 1 gear is meshed with a No. 2 gear, and the inner side of the No. 2 gear is fixedly connected to a motor.

[0021] Preferably, the output end of the motor is connected to the No. 2 support plate through a bearing, the bottom of the motor is fixedly connected to a heat insulating sleeve, the outer side of the heat insulating sleeve is fixedly connected to a base frame, the top of the base frame is fixedly connected to the No. 2 support plate, curved panels are symmetrically arranged on both sides of the No. 2 support plate, the curved panels are fixedly connected to the top of the base frame, and the bottom of the base frame is fixedly connected to a bottom plate.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. With the start of the vacuum pump, the vacuum pump will extract the air inside the built-in furnace, so as to avoid excessive oxygen in the furnace atmosphere, which will cause oxidation of the cylinder liner surface and affect the quality of the subsequent nitriding layer. The above-mentioned air extraction will not be completely extracted, but the degree of oxidation will be reduced.

[0024] 2. With the start-up of the heating element, high-temperature nitrogen will rush into the built-in furnace for heating treatment. The position of the heating element should be lower than that of the cylinder liner. The density of hot gas is less than that of air. Therefore, the gas flow rate can be more evenly distributed, resulting in the consistent thickness and hardness of the nitride layer on the surface of the cylinder liner.

[0025] 3. The rotating shaft fixedly connected to the inner side of the No. 1 gear will rotate with the No. 2 limiting sleeve, and finally the first batch of cylinder liners will rotate with the No. 2 limiting sleeve, so that the rotation of the first batch of cylinder liners can make their various parts more evenly exposed to the high temperature environment in the furnace, avoiding local overheating or insufficient temperature, thereby ensuring the consistency of the nitriding effect.

[0026] 4. The squeezed curved block will move along the hole groove toward the inner cavity, and in the process of moving inward, it will squeeze the plug plate. At this time, the plug plate will compress the spring and move upward until it is engaged with the bottom of the blocking cover, so that the blocking cover will not be disturbed by the left and right forces, and will not shake or deviate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the external structure of the nitriding furnace for treating the cylinder liner of the present invention.

[0028] Figure 2 It is a schematic cross-sectional structural diagram of the present invention as a whole.

[0029] Figure 3 It is a schematic cross-sectional structural diagram of the sealing mechanism of the present invention.

[0030] Figure 4 It is an enlarged structural schematic diagram of some components of the closing mechanism of the present invention.

[0031] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0032] Figure 6 It is a structural schematic diagram of the heating mechanism of the present invention.

[0033] Figure 7 It is a schematic cross-sectional structural diagram of the exhaust mechanism of the present invention.

[0034] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at point B in the middle.

[0035] Fig. 9 It is a schematic cross-sectional structural diagram of the heating component of the present invention.

[0036] Fig.10 It is an enlarged structural schematic diagram of some components of the heating assembly of the present invention.

[0037] Fig.11 It is a structural schematic diagram of the nitriding mechanism of the present invention.

[0038] Fig.12 It is a schematic cross-sectional view of the upper structure of the nitriding mechanism of the present invention.

[0039] Fig.13 For the present invention Fig.12 Schematic diagram of the enlarged structure at point C in the middle.

[0040] Fig.14 It is a schematic cross-sectional view of the lower structure of the nitriding mechanism of the present invention.

[0041] In the figure: 1, external furnace; 2, closing mechanism; 3, exhaust mechanism; 4, heating mechanism; 5, nitriding mechanism; 6, internal furnace; 21, top ring; 22, embedded ring; 23, plugging cover; 24, hole groove; 25, curved surface block; 26, top groove; 27, plug plate; 28, spring; 29, pressure relief nozzle; 41, external plate; 42, T-block; 43, elastic strip; 44, fixed plate; 45, heating assembly; 31, No. 1 dredging pipe; 32, vacuum pump; 33, No. 1 perforated plate; 34, No. 1 blocking block; 35, No. 1 connecting rod; 36, half-mouth block; 37, No. 1 embedded column; 38, No. 1 slide plate; 39, No. 1 return spring; 451, No. 2 dredging pipe ; 452, heating element; 453, No. 2 perforated plate; 454, No. 2 connecting rod; 455, notched block; 456, No. 2 blocking block; 457, No. 2 embedded column; 458, No. 2 slide plate; 459, No. 2 return spring; 51, cross rod frame; 52, lifting ring; 53, No. 1 support column; 54, No. 1 support plate; 55, No. 1 limiting sleeve; 56, fixing sleeve; 57, vertical rod; 58, No. 2 limiting sleeve; 59, rotating shaft; 50, No. 1 gear; 501, No. 2 gear; 502, motor; 503, No. 2 support plate; 504, thermal insulation sleeve; 505, bottom frame; 506, bottom plate; 507, perforated plate; 508, curved plate; 509, No. 2 support column. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] See also Figures 1 to 14 The present invention provides a technical solution: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes a closing mechanism 2, which is used to close and seal the entire device;

[0044] An exhaust mechanism 3, which is used to exhaust oxygen inside the device;

[0045] A heating mechanism 4, which is used to heat the furnace;

[0046] A nitriding mechanism 5, the nitriding mechanism 5 is used to perform nitriding treatment on the surface of the cylinder liner;

[0047] An external furnace 1 is arranged below the closing mechanism 2, the exhaust mechanism 3 and the heating mechanism 4 are fixedly installed inside the external furnace 1, a built-in furnace 6 is arranged at the center of the inner cavity of the external furnace 1, and the nitriding mechanism 5 is arranged inside the built-in furnace 6.

[0048] The closing mechanism 2 includes a top ring 21, the bottom of the top ring 21 is fixedly connected to the top of the built-in furnace 6, the outer side of the top ring 21 is fixedly connected with an embedded ring 22, the top of the embedded ring 22 is clamped with a plugging cover 23, the top of the plugging cover 23 is sleeved with a pressure relief nozzle 29, the outer side of the plugging cover 23 is extruded and adapted to the external furnace 1, the top of the external furnace 1 is provided with a top groove 26, the inner wall of the top groove 26 is embedded with the plugging cover 23, the inner side of the top ring 21 is provided with a hole groove 24, the inner side of the hole groove 24 is slidably adapted with a curved block 25, the outer side of the curved block 25 is extruded and adapted to the plugging cover 23, the end of the curved block 25 away from the plugging cover 23 is extruded and adapted with a plug plate 27, the plug plate 27 is inserted at the bottom of the top ring 21 and extends To the top, the outer side of the plug plate 27 is fixedly connected with a spring 28, and the top of the spring 28 is fixedly connected to the outer side of the top ring 21. The top of the plug plate 27 is engaged with the bottom of the blocking cover 23. After the nitriding mechanism 5 is completely placed in the built-in furnace 6, the blocking cover 23 is covered. At this time, the inner side of the blocking cover 23 will squeeze the curved surface block 25, and the squeezed curved surface block 25 will move toward the inner cavity along the hole groove 24. In the process of its inward movement, it will squeeze the plug plate 27. At this time, the plug plate 27 will compress the spring 28 and move upward until it is engaged with the bottom of the blocking cover 23, so that the blocking cover 23 will not be disturbed by the left and right forces, and will not shake or deviate.

[0049] like Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, the heating mechanism 4 includes an outer plate 41, which is fixedly connected to the outer side of the built-in furnace 6, and a T-block 42 is squeezed and adapted at the bottom of the outer plate 41. A heating component 45 is arranged at the bottom of the T-block 42, and the heating component 45 is sleeved on the outer side of the external furnace 1. The top of the T-block 42 is fixedly connected to an elastic bar 43, and the top of the elastic bar 43 is fixedly connected to a fixing plate 44, and the fixing plate 44 is fixedly connected to the inner side of the external furnace 1, wherein the built-in furnace 6 can be taken out from the external furnace 1, but will not be separated from the external furnace 1. Therefore, when a batch of cylinder liners are nitrided and taken out from the built-in furnace 6, the built-in furnace 6 needs to be taken out from the external furnace 1 to clean the impurities inside the built-in furnace 6. As the built-in furnace 6 is taken out upward, the outer plate 41 fixedly connected to its outer side stops squeezing the T-block 42 downward, and then the T-block 42 is drawn out from the No. 2 dredging pipe 451 under the action of the elastic bar 43. At this time, the residual gas in the No. 2 dredging pipe 451 will be discharged to the outside.

[0050] The exhaust mechanism 3 includes a No. 1 dredging pipe 31, which is respectively sleeved on the outside of the external furnace 1 and the internal furnace 6. An exhaust pump 32 is fixedly installed at one end of the No. 1 dredging pipe 31 close to the external furnace 1. A No. 1 perforated plate 33 is fixedly connected to the inside of the No. 1 dredging pipe 31. A No. 1 connecting rod 35 is inserted in the center of the No. 1 perforated plate 33. A half-block 36 is fixedly connected to the end of the No. 1 connecting rod 35 away from the No. 1 perforated plate 33. A half-block 36 is fixedly connected to the end of the No. 1 connecting rod 35 away from the half-block 36. The first block 34, the outer side of the first block 34 is respectively fixedly connected to the first embedded column 37 and the first slide plate 38, the outer side of the first embedded column 37 is clamped with the first hole plate 33, the inner side of the first slide plate 38 is fixedly connected to the first return spring 39, and the end of the first return spring 39 away from the first slide plate 38 is fixedly connected to the first hole plate 33. By placing the first batch of cylinder sleeves on the second limit sleeve 58 from top to bottom, and then inserting the first support plate 54 on the second support column 509, and then placing the first cylinder sleeves on the second limit sleeve 58, the first support plate 54 is fixedly connected to the second support column 509. The second batch of cylinder liners are placed on the No. 1 limiting sleeve 55, and then the entire nitriding mechanism 5 is placed in the built-in furnace 6. The bottom frame 505 in the nitriding mechanism 5 has two curved plates 508 fixedly connected to its top. When the curved plate 508 slides downward along the inner wall of the built-in furnace 6, it will first hit the half-mouth block 36, and then the No. 1 connecting rod 35 connected to the other end of the half-mouth block 36 will extend into the interior of the No. 1 dredging pipe 31 together. At the same time, the No. 1 blocking block 34 connected to the other end of the No. 1 connecting rod 35 will move away from the No. 1 perforated disk 33, causing the holes on the surface of the No. 1 perforated disk 33 originally blocked by the No. 1 embedded column 37 to open, and then accompanied by the start-up of the vacuum pump 32, the vacuum pump 32 will extract the air inside the built-in furnace 6, thereby avoiding excessive oxygen in the atmosphere in the furnace, which will cause oxidation of the cylinder liner surface and affect the quality of the subsequent nitriding layer. The above-mentioned air extraction will not be completely extracted, but the degree of oxidation will be reduced.

[0051] The heating assembly 45 includes a No. 2 dredging pipe 451, the top of which is plugged into the T-block 42, and the No. 2 dredging pipe 451 is respectively sleeved on the outside of the external furnace 1 and the built-in furnace 6, and a heating element 452 is fixedly installed on the end of the No. 2 dredging pipe 451 away from the built-in furnace 6, and a No. 2 perforated disk 453 is fixedly connected to the inside of the No. 2 dredging pipe 451, and a No. 2 connecting rod 454 is plugged into the center of the No. 2 perforated disk 453, and the No. 2 connecting rod 454 is away from the No. 2 perforated disk 453. The end of the No. 2 connecting rod 454 is fixedly connected with a notch block 455, the end of the No. 2 connecting rod 454 away from the notch block 455 is fixedly connected with a No. 2 blocking block 456, the outer side of the No. 2 blocking block 456 is respectively fixedly connected with a No. 2 embedded column 457 and a No. 2 slide plate 458, the outer side of the No. 2 embedded column 457 is clamped with the No. 2 perforated disk 453, the inner side of the No. 2 slide plate 458 is fixedly connected with a No. 2 return spring 459, the end of the No. 2 return spring 459 away from the No. 2 slide plate 458 is fixedly connected with the No. 2 perforated disk 453, and the curved surface is rotated. The plate 508 continues to move downward until its surface no longer squeezes the half-mouth block 36 but squeezes the notch block 455, the vacuum pump 32 will stop the vacuum treatment of the built-in furnace 6, and the squeezed notch block 455 will enter the No. 2 dredging pipe 451 together with the No. 2 connecting rod 454, and then the No. 2 blocking block 456 connected to the other end of the No. 2 connecting rod 454 will move away from the No. 2 perforated disk 453, and the No. 2 embedded column 457 fixedly connected to the surface of the No. 2 blocking block 456 will be separated from the No. 2 perforated disk 453, causing the holes on the surface of the No. 2 perforated disk 453 that was originally blocked to open, and finally with the start-up of the heating element 452, the high-temperature nitrogen will rush into the built-in furnace 6 for heating treatment, wherein the position of the heating element 452 is lower than the position of the cylinder liner, and the density of the hot gas is less than the density of the air, so this can make the gas flow distribution more uniform, resulting in the effect of consistent thickness and hardness of the nitride layer on the surface of the cylinder liner.

[0052] like Fig.11 , Fig.12 , Fig.13 and Fig.14 As shown, the nitriding mechanism 5 includes a cross-bar frame 51, the top of the cross-bar frame 51 is fixedly connected to a hanging ring 52, the bottom of the cross-bar frame 51 is fixedly connected to a No. 1 support column 53, the bottom of the No. 1 support column 53 is fixedly connected to a No. 1 support plate 54, the bottom of the No. 1 support plate 54 is plugged with a No. 2 support column 509, the bottom of the No. 2 support column 509 is fixedly connected to a No. 2 support plate 503, and the top of the No. 2 support plate 503 is fixedly connected to a perforated plate 507;

[0053] A No. 1 limiting sleeve 55 is arranged above the No. 1 supporting plate 54, and a fixing sleeve 56 is fixedly connected to the bottom of the No. 1 limiting sleeve 55, and the bottom of the fixing sleeve 56 is rotatably connected to the No. 1 supporting plate 54, and a vertical rod 57 is fixedly connected to the central part of the bottom of the fixing sleeve 56, and a No. 2 limiting sleeve 58 is squeezed and adapted at the bottom of the vertical rod 57. The second batch of cylinder sleeves are placed on the No. 1 limiting sleeve 55, and both of them have weight. Therefore, the fixing sleeve 56 fixedly connected to the bottom of the No. 1 limiting sleeve 55 and the vertical rod 57 connected to the inner side of the fixing sleeve 56 will be subjected to force. At this time, the friction between the vertical rod 57 and the No. 2 limiting sleeve 58 will become larger, and through the rotation of the No. 2 limiting sleeve 58 and the action of the friction force, the No. 1 limiting sleeve 55 will rotate with the second batch of cylinder sleeves. The bottom of the No. 2 limiting sleeve 58 is fixedly connected with a rotating shaft 59, and the outer side of the rotating shaft 59 is rotatably connected with the perforated disk 507. A No. 1 gear 50 is arranged below the perforated disk 507, and the inner side of the No. 1 gear 50 is fixedly connected with the rotating shaft 59. The outer side of the No. 1 gear 50 is meshed with a No. 2 gear 501, and the inner side of the No. 2 gear 501 is fixedly connected with a motor 502. During the nitriding treatment of the cylinder liner surface by high-temperature nitrogen, the motor 502 is started, so that the No. 2 gear 501 connected to its output end will rotate, and at the same time, the No. 1 gear meshed with the No. 2 gear 501 is driven. 50 will rotate in the forward direction accordingly, and then the rotating shaft 59 fixedly connected to the inner side of the No. 1 gear 50 will rotate together with the No. 2 limiting sleeve 58, and finally the first batch of cylinder liners will rotate together with the No. 2 limiting sleeve 58, so that the rotation of the first batch of cylinder liners can make their various parts more evenly exposed to the high temperature environment in the furnace, avoiding local overheating or insufficient temperature, thereby ensuring the consistency of the nitriding effect; at the same time, it also helps the gas to contact the surface of the cylinder liners more evenly, so that the nitrogen atoms can be more evenly diffused to the surface of the cylinder liners, forming a nitriding layer with more uniform thickness and performance. The output end of the motor 502 is connected to the second support plate 503 through a bearing, the bottom of the motor 502 is fixedly connected to a heat insulating sleeve 504, the outer side of the heat insulating sleeve 504 is fixedly connected to a base frame 505, the top of the base frame 505 is fixedly connected to the second support plate 503, curved panels 508 are symmetrically arranged on both sides of the second support plate 503, the curved panels 508 are fixedly connected to the top of the base frame 505, and the bottom of the base frame 505 is fixedly connected to a bottom plate 506.

[0054] When the present invention is in use: first, the nitriding mechanism 5 is placed in the built-in furnace 6, wherein the upper and lower parts of the nitriding mechanism 5 are detachable, and at the same time, the bottom frame 505 in the nitriding mechanism 5 has two curved panels 508 fixedly connected to its top, and when the curved panel 508 slides downward along the inner wall of the built-in furnace 6, it will first hit the half-mouth block 36, and then the No. 1 connecting rod 35 connected to the other end of the half-mouth block 36 will extend into the interior of the No. 1 dredging pipe 31 together, and at the same time, the No. 1 blocking block 34 connected to the other end of the No. 1 connecting rod 35 will move away from the No. 1 perforated disk 33, causing the hole on the surface of the No. 1 perforated disk 33 originally blocked by the No. 1 embedded column 37 to open, and then accompanied by the start-up of the vacuum pump 32, the vacuum pump 32 will extract the air inside the built-in furnace 6. As the curved plate 508 continues to move downward until its surface no longer squeezes the half-mouth block 36 but squeezes the notch block 455, the vacuum pump 32 will stop pumping air to the built-in furnace 6, and the squeezed notch block 455 will enter the No. 2 dredging pipe 451 together with the No. 2 connecting rod 454, and then the No. 2 blocking block 456 connected to the other end of the No. 2 connecting rod 454 will move away from the No. 2 perforated disk 453. Similarly, the No. 2 embedded column 457 fixedly connected to the surface of the No. 2 blocking block 456 will be separated from the No. 2 perforated disk 453, causing the holes on the surface of the No. 2 perforated disk 453 that was originally blocked to open, and finally with the start-up of the heating element 452, the high-temperature gas will rush into the built-in furnace 6 for heating treatment.

[0055] Then, the blocking cover 23 is put on, and the inner side of the blocking cover 23 will squeeze the curved block 25, and the squeezed curved block 25 will move toward the inner cavity along the hole groove 24. In the process of moving inward, it will squeeze the plug plate 27, and the plug plate 27 will compress the spring 28 and move upward until it is engaged with the bottom of the blocking cover 23.

[0056] The above-mentioned embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work all fall within the scope of protection of the present invention.

Claims

1. Nitriding furnace for cylinder liner treatment, characterized in that: include: A closing mechanism (2), the closing mechanism (2) being used for closing and sealing the entire device; An exhaust mechanism (3), the exhaust mechanism (3) being used to exhaust oxygen inside the device; A heating mechanism (4), the heating mechanism (4) being used to perform a heating process in the furnace; A nitriding mechanism (5), the nitriding mechanism (5) being used to perform nitriding treatment on the surface of the cylinder liner; An external furnace (1) is arranged below the sealing mechanism (2); the exhaust mechanism (3) and the heating mechanism (4) are both fixedly mounted inside the external furnace (1); an internal furnace (6) is arranged at the center of the inner cavity of the external furnace (1); and the nitriding mechanism (5) is arranged inside the internal furnace (6); The nitriding mechanism (5) comprises a cross-bar frame (51), the top of the cross-bar frame (51) is fixedly connected to a lifting ring (52), the bottom of the cross-bar frame (51) is fixedly connected to a No. 1 support column (53), the bottom of the No. 1 support column (53) is fixedly connected to a No. 1 support plate (54), the bottom of the No. 1 support plate (54) is plugged with a No. 2 support column (509), the bottom of the No. 2 support column (509) is fixedly connected to a No. 2 support plate (503), and the top of the No. 2 support plate (503) is fixedly connected to a perforated plate (507); A No. 1 limiting sleeve (55) is arranged above the No. 1 supporting plate (54); a fixing sleeve (56) is fixedly connected to the bottom of the No. 1 limiting sleeve (55); the bottom of the fixing sleeve (56) is rotatably connected to the No. 1 supporting plate (54); a vertical rod (57) is fixedly connected to the center of the bottom of the fixing sleeve (56); and a No. 2 limiting sleeve (58) is squeezed and adapted to the bottom of the vertical rod (57); The heating mechanism (4) comprises an external plate (41), the external plate (41) being fixedly connected to the outside of the built-in furnace (6), the bottom of the external plate (41) being extruded and adapted with a T-block (42), the bottom of the T-block (42) being provided with a heating component (45), the heating component (45) being sleeved on the outside of the external furnace (1), the top of the T-block (42) being fixedly connected to an elastic bar (43), the top of the elastic bar (43) being fixedly connected to a fixing plate (44), the fixing plate (44) being fixedly connected to the inside of the external furnace (1); The exhaust mechanism (3) comprises a No. 1 dredging pipe (31), the No. 1 dredging pipe (31) being respectively sleeved on the outside of the external furnace (1) and the internal furnace (6), an exhaust pump (32) being fixedly mounted on one end of the No. 1 dredging pipe (31) close to the external furnace (1), a No. 1 perforated plate (33) being fixedly connected inside the No. 1 dredging pipe (31), a No. 1 connecting rod (35) being inserted into the center of the No. 1 perforated plate (33), and a half-block (36) being fixedly connected to one end of the No. 1 connecting rod (35) away from the No. 1 perforated plate (33); The heating assembly (45) comprises a No. 2 dredging pipe (451), the top of the No. 2 dredging pipe (451) is plugged into the T-block (42), the No. 2 dredging pipe (451) is respectively sleeved on the outside of the external furnace (1) and the internal furnace (6), a heating element (452) is fixedly installed on one end of the No. 2 dredging pipe (451) away from the internal furnace (6), a No. 2 perforated disk (453) is fixedly connected inside the No. 2 dredging pipe (451), a No. 2 connecting rod (454) is plugged into the center of the No. 2 perforated disk (453), and a notch block (455) is fixedly connected to one end of the No. 2 connecting rod (454) away from the No. 2 perforated disk (453); One end of the No. 2 connecting rod (454) away from the notch block (455) is fixedly connected to the No. 2 blocking block (456); the outer side of the No. 2 blocking block (456) is respectively fixedly connected to the No. 2 embedded column (457) and the No. 2 slide plate (458); the outer side of the No. 2 embedded column (457) is clamped with the No. 2 perforated disk (453); the inner side of the No. 2 slide plate (458) is fixedly connected to the No. 2 return spring (459); the end of the No. 2 return spring (459) away from the No. 2 slide plate (458) is fixedly connected to the No. 2 perforated disk (453); The bottom of the No. 2 limiting sleeve (58) is fixedly connected to a rotating shaft (59), the outer side of the rotating shaft (59) is rotatably connected to the perforated plate (507), a No. 1 gear (50) is arranged below the perforated plate (507), the inner side of the No. 1 gear (50) is fixedly connected to the rotating shaft (59), the outer side of the No. 1 gear (50) is meshed with a No. 2 gear (501), and the inner side of the No. 2 gear (501) is fixedly connected to a motor (502).

2. The nitriding furnace for cylinder liner treatment according to claim 1, characterized in that: The sealing mechanism (2) comprises a top ring (21), the bottom of the top ring (21) is fixedly connected to the top of the built-in furnace (6), the outer side of the top ring (21) is fixedly connected to an embedded ring (22), the top of the embedded ring (22) is clamped with a blocking cover (23), the top of the blocking cover (23) is sleeved with a pressure relief nozzle (29), the outer side of the blocking cover (23) is extruded and adapted to the external furnace (1), the top of the external furnace (1) is provided with a top groove (26), and the inner wall of the top groove (26) is embedded with the blocking cover (23).

3. The nitriding furnace for cylinder liner treatment according to claim 2, characterized in that: A hole groove (24) is provided on the inner side of the top ring (21), a curved block (25) is slidably fitted inside the hole groove (24), the outer side of the curved block (25) is pressed and fitted with the blocking cover (23), an insert plate (27) is pressed and fitted on one end of the curved block (25) away from the blocking cover (23), the insert plate (27) is inserted through the bottom of the top ring (21) and extends to the top, a spring (28) is fixedly connected to the outer side of the insert plate (27), the top end of the spring (28) is fixedly connected to the outer side of the top ring (21), and the top end of the insert plate (27) is snap-fitted with the bottom of the blocking cover (23).

4. The nitriding furnace for treating cylinder liners according to claim 1, characterized in that: One end of the No. 1 connecting rod (35) away from the half-block (36) is fixedly connected to the No. 1 blocking block (34), and the outer side of the No. 1 blocking block (34) is respectively fixedly connected to a No. 1 embedded column (37) and a No. 1 slide plate (38), the outer side of the No. 1 embedded column (37) is clamped with the No. 1 perforated disk (33), and the inner side of the No. 1 slide plate (38) is fixedly connected to a No. 1 return spring (39), and the end of the No. 1 return spring (39) away from the No. 1 slide plate (38) is fixedly connected to the No. 1 perforated disk (33).

5. The nitriding furnace for treating cylinder liners according to claim 1, characterized in that: The output end of the motor (502) is connected to the second support plate (503) via a bearing; a heat insulating sleeve (504) is fixedly connected to the bottom of the motor (502); a bottom frame (505) is fixedly connected to the outside of the heat insulating sleeve (504); the top of the bottom frame (505) is fixedly connected to the second support plate (503); curved panels (508) are symmetrically arranged on both sides of the second support plate (503); the curved panels (508) are fixedly connected to the top of the bottom frame (505); and a bottom plate (506) is fixedly connected to the bottom of the bottom frame (505).

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