Controllable atmosphere well type nitriding furnace capable of hanging multiple machine tool spindles

Abstract

The utility model belongs to the technical field of heat treatment equipment, and particularly relates to a controllable atmosphere well type nitriding furnace capable of hanging a plurality of machine tool spindles. The suspension lifting appliance provided by the utility model is carried on the connecting plate, and a machine tool spindle is suspended below the suspension lifting appliance for gas nitriding treatment, so that the problem that shaft parts are bent to a certain extent due to deformation caused by non-axial gravity action under a high-temperature condition is avoided. The suspension lifting appliance is mainly applied to slender shaft products such as machine tool (boring machine) spindles and the like, gas nitriding is carried out through connection and hanging of the suspension lifting appliance, a plurality of machine tool spindles of different specifications can be simultaneously suspended below the suspension lifting appliance to carry out gas nitriding treatment, and the machine tool spindles and the suspension lifting appliance are connected and fixed through hooks and screws.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat treatment equipment, and in particular relates to a controllable atmosphere pit-type nitriding furnace capable of suspending a plurality of machine tool spindles. Background Art

[0002] At present, when the spindle of a machine tool is commonly gas nitrided in a nitriding furnace, a traditional vertical tooling is generally placed in a standing position for nitriding treatment. During the heating process, cooling process and long-term heat preservation, because the parts stand on the tooling, the bottom of the workpiece contacts the tray, and the top of the workpiece contacts the side wall of the tooling, there is a certain resistance to the elongation and contraction of the workpiece under temperature changes and high temperature environments. The elongation and contraction are limited, resulting in the workpiece being unable to stretch and contract freely. At the same time, the non-axial gravity under high temperature conditions will cause the shaft parts to deform, and then a certain degree of bending will occur. After nitriding, straightening is required to meet the requirements. The straightening process will destroy the local nitriding layer and form new stress, which will ultimately lead to a decrease in product qualification rate.

[0003] Therefore, it is urgently necessary to design a nitriding furnace that can ensure that the machine tool spindle does not deform during nitriding. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a controllable atmosphere pit-type nitriding furnace that can suspend multiple machine tool spindles; the machine tool spindles do not deform after nitriding in the nitriding furnace, and the product qualification rate is high; the nitriding furnace has high operability, high efficiency, good airtightness and lower energy consumption.

[0005] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0006] A controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles comprises a nitriding furnace shell 1; a furnace lining 2 is provided on the inner side of the nitriding furnace shell 1; a first air duct 3 is provided inside the furnace lining 2; a connecting plate 31 is provided at the lower edge of the first air duct 3, and a furnace cover assembly 4 is provided above the first air duct 3; a second air duct 32 is provided below the first air duct 3, and the second air duct 32 is connected to the connecting plate 31; the diameter of the second air duct 32 is smaller than that of the first air duct 3, and the inner cavity of the second air duct 32 is connected to the inner cavity of the first air duct 3; a hanging hanger 5 is provided in the first air duct 3, and the hanging hanger 5 is provided. The hanger 5 is overlapped with the connecting plate 31; a rib plate 6 is provided on the inner wall of the furnace lining 2, and the rib plate 6 is connected to the inner wall of the furnace lining 2 and the connecting plate 31; a muffle furnace body 7 is provided below the second air duct 32, and the muffle furnace body 7 is provided in the second air duct 32, and a first gap is provided between the muffle furnace body 7 and the second air duct 32; a second gap is provided between the first air duct 3 and the furnace lining 2; a third gap is provided between the second air duct 32 and the furnace lining 2; a fourth gap is provided between the muffle furnace body 7 and the furnace lining 2; wherein the first gap, the second gap, the third gap and the fourth gap are interconnected.

[0007] Furthermore, the suspension sling 5 includes a sling center piece 501, the center of which corresponds to the axis of the muffle furnace body 7; working arms 502 are arranged around the sling center piece 501, and the working arms 502 are connected to the sling center piece 501. The number of working arms 502 is at least 2, and at least 2 working arms 502 are symmetrically arranged relative to the sling center piece 501; a lifting ear 503 is provided on the outside of the sling center piece 501, and the lifting ear 503 is connected to both the sling center piece 501 and the working arm 502.

[0008] Furthermore, the suspension sling 5 also includes a first tooling hole 504; the first tooling hole 504 is set through the working arm 502; a second tooling hole 505 is set between the first tooling hole 504 and the sling center piece 501, and the second tooling hole 505 is set through the working arm 505.

[0009] Furthermore, the suspension sling 5 also includes an auxiliary rod 506; the auxiliary rod 506 passes through the first tooling hole 504, and the two ends of the auxiliary rod 506 are respectively located on both sides of the working arm 502; a first connecting bolt 507 is set on both sides of the working arm 502, and the first connecting bolt 507 is connected to the auxiliary rod 506; a second connecting bolt 508 is passed through the second tooling hole 505; a hook 509 is provided in connection with the first connecting bolt 507 and / or the second connecting bolt 508; a screw 510 is passed through the hook 509.

[0010] Furthermore, the controlled atmosphere pit-type nitriding furnace further includes a lifting mechanism 9 , which is disposed on the outer wall of the nitriding furnace shell 1 and is connected to both the furnace cover assembly 4 and the nitriding furnace shell 1 .

[0011] Furthermore, the furnace cover assembly 4 includes a top cover 41; the top cover 41 is arranged above the nitriding furnace shell 1 and is connected to the lifting mechanism 9; an upper cover 42 is arranged below the top cover 41, and the upper cover 42 is connected to the top cover 41; a connecting portion 43 is arranged below the upper cover 42, and the connecting portion 43 is connected to the upper cover 42; a bottom cover 44 is arranged below the connecting portion 43, and the bottom cover 44 is connected to the connecting portion 43; connecting rods 45 are arranged around the connecting portion 43, and the connecting rods 45 are connected to both the upper cover 42 and the bottom cover 44, and the number of connecting rods 45 is multiple; wherein, the area between the upper cover 42 and the bottom cover 44 is connected to the second gap.

[0012] Furthermore, the nitriding furnace shell 1 is filled with heat-insulating fiber blocks, and the multiple heat-insulating fiber blocks are arranged in a staggered manner.

[0013] Furthermore, the controlled atmosphere pit-type nitriding furnace further includes a fixing member 8 , which is disposed between the muffle furnace body 7 and the furnace lining 2 , and is connected to both the muffle furnace body 7 and the furnace lining 2 .

[0014] Furthermore, the controlled atmosphere pit-type nitriding furnace also includes a furnace cover seal 10; the furnace cover seal 10 is arranged on the outer edge of the inner wall of the top cover 41 and is connected to the inner wall of the top cover 41. When the furnace cover 4 and the first air duct 3 are closed, the furnace cover seal 10 seals the furnace cover 4 and the furnace lining 2.

[0015] Furthermore, the controlled atmosphere pit-type nitriding furnace further includes a drainage fan 11 ; the drainage fan 11 is disposed outside the connecting portion 43 and connected to the connecting portion 43 . BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the nitriding furnace of the utility model.

[0017] Figure 2 Schematic diagram of a top view of a suspension sling according to the present invention.

[0018] Figure 3 Schematic cross-sectional view of the suspension sling of the present utility model.

[0019] Figure 4 Schematic diagram of the positions of the first tooling hole and the second tooling hole of the utility model.

[0020] Figure 5 This utility model Figure 1 Enlarged view of part A in the middle.

[0021] Among them, 1. nitriding furnace shell; 2. furnace lining; 3. first air duct; 4. furnace cover assembly; 5. suspension sling; 6. rib plate; 7. muffle furnace body; 8. fixing parts; 9. lifting mechanism; 10. cover seal; 11. draft fan; 31. connecting plate; 32. second air duct; 41. top cover; 42. upper cover; 43. connecting part; 44. bottom cover; 45. connecting rod; 501. sling center piece; 502. working arm; 503. lifting ear; 504. first tooling hole; 505. second tooling hole; 506. auxiliary rod; 507. first connecting bolt; 508. second connecting bolt; 509. hook; 510. screw. DETAILED DESCRIPTION

[0022] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-Figure 5As shown, the embodiment of the present invention provides a controllable atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles, comprising a nitriding furnace shell 1; a furnace lining 2 is provided on the inner side of the nitriding furnace shell 1; a first air duct 3 is provided inside the furnace lining 2; a connecting plate 31 is welded to the lower edge of the first air duct 3, and a furnace cover assembly 4 is provided above the first air duct 3; a second air duct 32 is provided below the first air duct 3, and the second air duct 32 is welded to the connecting plate 31; the diameter of the second air duct 32 is smaller than that of the first air duct 3, and the inner cavity of the second air duct 32 is connected to the inner cavity of the first air duct 3; a suspension is provided in the first air duct 3. A hanging sling 5 is overlapped on the connecting plate 31; a rib plate 6 is provided on the inner wall of the furnace lining 2, and the rib plate 6 is welded to the inner wall of the furnace lining 2 and the connecting plate 31; a muffle furnace body 7 is provided below the second air duct 32, and the muffle furnace body 7 is provided in the second air duct 32, and a first gap is provided between the muffle furnace body 7 and the second air duct 32; a second gap is provided between the first air duct 3 and the furnace lining 2; a third gap is provided between the second air duct 32 and the furnace lining 2; a fourth gap is provided between the muffle furnace body 7 and the furnace lining 2; wherein the first gap, the second gap, the third gap and the fourth gap are interconnected.

[0025] During the nitriding process, a suspension hanger is mounted on a connecting plate, with the machine tool spindle suspended beneath it for gas nitriding. This prevents non-axial gravity at high temperatures, which can cause deformation and bending of shaft components. The first, second, third, and fourth gaps are interconnected, ensuring a uniform atmosphere rich in active nitrogen atoms during the nitriding process. Because the suspension hanger is mounted on the connecting plate, it can be removed at any time to replace a hanger of a different diameter or replaced if damaged.

[0026] In one embodiment, the suspension sling 5 includes a sling center piece 501, the center of which corresponds to the axis of the muffle furnace body 7; working arms 502 are arranged around the sling center piece 501 and connected to the sling center piece 501. The number of working arms 502 is six, and two working arms 502 are symmetrically arranged relative to the sling center piece 501 to form three groups of working arms 502; the sling center piece 501 is externally provided with lifting ears 503, which are connected to both the sling center piece 501 and the working arms 502. The suspension sling 5 also includes a first tooling hole 504; the first tooling hole 504 is provided through the working arm 502; a second tooling hole 505 is provided between the first tooling hole 504 and the sling center piece 501, and the second tooling hole 505 is provided through the working arm 505. The suspension sling 5 also includes an auxiliary rod 506; the auxiliary rod 506 passes through the first tooling hole 504, and the two ends of the auxiliary rod 506 are respectively located on both sides of the working arm 502; a first connecting bolt 507 is set on both sides of the working arm 502, and the first connecting bolt 507 is connected to the auxiliary rod 506; a second connecting bolt 508 is passed through the second tooling hole 505; a hook 509 is fixedly connected to the first connecting bolt 507 and the second connecting bolt 508; a screw 510 is passed through the hook 509.

[0027] The suspension crane has 6 working arms, each of which has 3 positions for hanging machine tool spindles. This means that one suspension crane can simultaneously hang and nitride 18 machine tool spindles. These 18 machine tool spindles can be of the same or different specifications; the original screw holes on the end faces of the machine tool spindles are hung on the hooks and tightened with screws.

[0028] In one embodiment, the controlled atmosphere pit-type nitriding furnace further includes a lifting mechanism 9, which is disposed on the outer wall of the nitriding furnace shell 1 and is connected to the furnace cover assembly 4 and the nitriding furnace shell 1. The provision of the lifting mechanism allows the furnace cover assembly to be opened mechanically, eliminating manual labor.

[0029] In one embodiment, the furnace cover assembly 4 includes a top cover 41; the top cover 41 is arranged above the nitriding furnace shell 1 and is connected to the lifting mechanism 9; an upper cover 42 is arranged below the top cover 41, and the upper cover 42 is connected to the top cover 41; a connecting portion 43 is arranged below the upper cover 42, and the connecting portion 43 is connected to the upper cover 42; a bottom cover 44 is arranged below the connecting portion 43, and the bottom cover 44 is connected to the connecting portion 43; connecting rods 45 are arranged around the connecting portion 43, and the connecting rods 45 are connected to both the upper cover 42 and the bottom cover 44, and the number of connecting rods 45 is multiple; wherein, the area between the upper cover 42 and the bottom cover 44 is connected to the second gap.

[0030] In one embodiment, the nitriding furnace shell 1 is filled with heat-insulating fiber blocks, and the multiple heat-insulating fiber blocks are arranged in a staggered manner. The staggered arrangement of the multiple heat-insulating fiber blocks can achieve a better heat-insulating effect.

[0031] In one embodiment, the controlled atmosphere pit nitriding furnace further includes a fixing member 8, which is disposed between the muffle furnace body 7 and the furnace lining 2 and is connected to both the muffle furnace body 7 and the furnace lining 2. The fixing member is a bolt that connects and locks the muffle furnace body 7 and the furnace lining 2. The controlled atmosphere pit nitriding furnace is provided with multiple bolts to fix the muffle furnace body 7, leaving a gap between the muffle furnace body 7 and the furnace lining 2.

[0032] In one embodiment, the controlled atmosphere pit-type nitriding furnace further includes a furnace cover seal 10 ; the furnace cover seal 10 is disposed on the outer edge of the inner wall of the top cover 41 and is connected to the inner wall of the top cover 41 . When the furnace cover 4 and the first air duct 3 are closed, the furnace cover seal 10 seals the furnace cover 4 from the furnace lining 2 . The furnace cover seal 10 ensures airtightness during operation of the nitriding furnace.

[0033] In one embodiment, the controlled atmosphere pit-type nitriding furnace further includes a draft fan 11, which is disposed outside the connection portion 43 and connected to the connection portion 43. During operation, nitrogen-rich gas flows through the first gap into the inner cavities of the first and second air ducts under the guidance of the draft fan, further ensuring a uniform gas atmosphere during the nitriding process.

Claims

1. A controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles, characterized in that: The invention comprises a nitriding furnace shell (1); a furnace lining (2) is provided on the inner side of the nitriding furnace shell (1); a first air duct (3) is provided inside the furnace lining (2); a connecting plate (31) is provided at the lower edge of the first air duct (3), and a furnace cover assembly (4) is provided above the first air duct (3); a second air duct (32) is provided below the first air duct (3), and the second air duct (32) is connected to the connecting plate (31); the diameter of the second air duct (32) is smaller than the diameter of the first air duct (3), and the inner cavity of the second air duct (32) is connected to the inner cavity of the first air duct (3); a hanging hanger (5) is provided in the first air duct (3), and the hanging hanger (5) is connected to the connecting plate (31); ) overlap; the inner wall of the furnace lining (2) is provided with a rib plate (6), and the rib plate (6) is connected to the inner wall of the furnace lining (2) and the connecting plate (31); a muffle furnace body (7) is provided below the second air guide tube (32), and the muffle furnace body (7) is provided in the second air guide tube (32), and a first gap is provided between the muffle furnace body (7) and the second air guide tube (32); a second gap is provided between the first air guide tube (3) and the furnace lining (2); a third gap is provided between the second air guide tube (32) and the furnace lining (2); a fourth gap is provided between the muffle furnace body (7) and the furnace lining (2); wherein the first gap, the second gap, the third gap and the fourth gap are interconnected.

2. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 1, characterized in that: The suspension sling (5) includes a sling center piece (501), the center of which corresponds to the axis of the muffle furnace body (7); a working arm (502) is arranged around the sling center piece (501), and the working arm (502) is connected to the sling center piece (501), the number of the working arms (502) is at least 2, and at least 2 of the working arms (502) are symmetrically arranged relative to the sling center piece (501); a sling ear (503) is provided on the outside of the sling center piece (501), and the sling ear (503) is connected to both the sling center piece (501) and the working arm (502).

3. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 2, characterized in that: The suspension sling (5) further comprises a first tooling hole (504); the first tooling hole (504) is provided on the working arm (502) in a through-going manner; a second tooling hole (505) is provided between the first tooling hole (504) and the sling center piece (501), and the second tooling hole (505) is provided on the working arm (502) in a through-going manner.

4. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 3, characterized in that: The suspension hanger (5) further includes an auxiliary rod (506); the auxiliary rod (506) passes through the first tooling hole (504), and the two ends of the auxiliary rod (506) are respectively located on both sides of the working arm (502); first connecting bolts (507) are provided on both sides of the working arm (502), and the first connecting bolts (507) are connected to the auxiliary rod (506); a second connecting bolt (508) is passed through the second tooling hole (505); a hook (509) is provided in connection with the first connecting bolt (507) and / or the second connecting bolt (508); a screw (510) is passed through the hook (509).

5. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 1, characterized in that: The controlled atmosphere pit-type nitriding furnace further comprises a lifting mechanism (9), which is arranged on the outer wall of the nitriding furnace shell (1) and is connected to the furnace cover assembly (4) and the nitriding furnace shell (1).

6. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 5, characterized in that: The furnace cover assembly (4) includes a top cover (41); the top cover (41) is arranged above the nitriding furnace shell (1) and is connected to the lifting mechanism (9); an upper cover (42) is arranged below the top cover (41), and the upper cover (42) is connected to the top cover (41); a connecting portion (43) is arranged below the upper cover (42), and the connecting portion (43) is connected to the upper cover (42); a bottom cover (44) is arranged below the connecting portion (43), and the bottom cover (44) is connected to the connecting portion (43); a connecting rod (45) is arranged around the connecting portion (43), and the connecting rod (45) is connected to both the upper cover (42) and the bottom cover (44), and the number of the connecting rods (45) is multiple; wherein, the area between the upper cover (42) and the bottom cover (44) is connected to the second gap.

7. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 1, characterized in that: The nitriding furnace shell (1) is filled with heat-insulating fiber blocks, and the plurality of heat-insulating fiber blocks are arranged in a staggered manner.

8. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 1, characterized in that: The controlled atmosphere pit-type nitriding furnace further includes a fixing member (8), which is arranged between the muffle furnace body (7) and the furnace lining (2), and is connected to both the muffle furnace body (7) and the furnace lining (2).

9. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 6, characterized in that: The controlled atmosphere pit-type nitriding furnace further includes a furnace cover seal (10); the furnace cover seal (10) is arranged on the outer edge of the inner wall of the top cover (41) and is connected to the inner wall of the top cover (41); when the furnace cover assembly (4) and the first air duct (3) are closed, the furnace cover seal (10) seals the furnace cover assembly (4) and the furnace lining (2).

10. The controlled atmosphere pit-type nitriding furnace capable of suspending multiple machine tool spindles according to claim 6, characterized in that: The controlled atmosphere pit-type nitriding furnace further includes a drainage fan (11); the drainage fan (11) is arranged outside the connecting portion (43) and connected to the connecting portion (43).

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