Slotting device and method in a housing

Abstract

A shell inner slotting device and method, belong to boring processing technical field, for processing the slot of shell inside, including rotation main shaft, cutter head, conversion transmission mechanism, boring cutter, radial feed gear and gear shift, cutter head is fixed on rotation main shaft, conversion transmission mechanism is set up on cutter head, radial feed gear is set up on conversion transmission mechanism, radial feed gear and conversion transmission mechanism rotate with cutter head, gear shift and shell are opposite fixedly set up in the radial of rotation main shaft, cutter head every rotation a week, radial feed gear and gear shift mesh once;Conversion transmission mechanism connects radial feed gear and boring cutter, radial feed gear every revolution and gear shift mesh once, then realizes the radial feed of boring cutter through screw feed mechanism, can complete radial feed without rotation main shaft axial feed, improves stable support with cutter head, prevents boring cutter from happening tremble in the working process, and processing precision is high.

Description

Technical Field

[0001] A grooving device and method for internal casing, belonging to the field of boring technology. Background Technology

[0002] The suction port diameter of a large split-case pump body can reach more than 1 meter. However, when a concentric locating groove is opened at this location, the spindle of a conventional boring machine cannot feed radially while maintaining a fixed relative position with the center of the workpiece on the worktable.

[0003] CN202222692717.X discloses a radial feed mechanism for a conical deep hole boring machine. It uses an axial rack, a radial rack, and an intermediate radial feed gear reducer to achieve radial feed of the boring tool. However, it still requires axial movement to achieve radial feed, can only machine conical holes, and cannot machine positioning grooves of equal depth. Moreover, this feed mechanism cannot be installed on the bearing platform of the pump body.

[0004] Even if a CNC boring machine can use a small cutter head to machine along a large groove trajectory, the bearing seats at both ends of the pump body limit the rotation diameter of the machine tool spindle. Lengthening the cutter bar in the diameter direction would result in it being too thin and prone to vibration, while thickening it would cause the spindle to deform due to insufficient support. Neither approach can guarantee the dimensional accuracy of the machined groove.

[0005] CN205464454U discloses a radial automatic feed device for a rotary table. The rotary table of a CNC boring machine can achieve radial feed, but it is large in size and difficult to achieve clamping and rotation at both ends, making it impossible to machine the positioning groove inside the pump body. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a grooving device and method for the shell, which can use a conventional boring machine to process the positioning groove inside a large shell, and has good stability and high processing accuracy.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: the grooving device inside the housing is used to process the groove on the inner side of the housing, including a rotating spindle, a cutter head, a conversion transmission mechanism, a boring tool, a radial feed gear and a pick. The cutter head is fixed on the rotating spindle, the conversion transmission mechanism is set on the cutter head, the radial feed gear is set on the conversion transmission mechanism, the radial feed gear and the conversion transmission mechanism rotate with the cutter head, and the pick is fixedly set relative to the housing in the radial direction of the rotating spindle. The radial feed gear and the pick mesh once for each rotation of the cutter head.

[0008] The conversion transmission mechanism connects the radial feed gear and the boring tool. The conversion transmission mechanism converts the rotation of the radial feed gear into linear motion and drives the boring tool to move radially along the housing.

[0009] Preferably, the conversion transmission mechanism is a screw feed mechanism.

[0010] The transmission mechanism can also be a crank-slider mechanism.

[0011] Preferably, the screw feed mechanism includes a fixed seat, a screw shaft, and a slider. The fixed seat is fixed on the cutter head, the screw shaft is rotatably connected to the fixed seat, the screw shaft is arranged radially along the cutter head, a radial feed gear is connected to and drives the screw shaft to rotate, the slider is threadedly connected to the screw shaft, the slider is slidably connected to the fixed seat, and the boring tool is fixed on the slider.

[0012] Preferably, the axis of the radial feed gear is perpendicular to the axis of the rotating spindle, and the radial feed gear is coaxially fixed to one end of the screw shaft;

[0013] Alternatively, the axis of the radial feed gear is set parallel to the axis of the rotating spindle, and the radial feed gear is connected to the screw shaft through an intermediate transmission mechanism.

[0014] Preferably, the intermediate transmission mechanism includes a turbine and a worm gear, the turbine is fixedly connected to the screw shaft, the worm gear meshes with the turbine, and the radial feed gear is coaxially fixed to one end of the worm gear.

[0015] Preferably, a pressure cap is fixed on the side of the fixed seat away from the cutter head, and a guide groove is formed between the pressure cap and the fixed seat. The slider is provided with a guide sliding part that is slidably disposed in the guide groove.

[0016] Preferably, the slider includes a sliding plate and a threaded connecting block. The sliding plate is fixed to one side of the threaded connecting block, the threaded connecting block is threadedly connected to the screw shaft, the two sides of the sliding plate are sliding parts, and the boring tool is fixed on the sliding plate.

[0017] Preferably, the slider is provided with a fixing groove, the boring tool is disposed in the fixing groove, and the slider is provided with a pressure block for pressing the boring tool.

[0018] Preferably, the cutter head or conversion transmission mechanism is connected to an axial feed device. The axial feed device is connected to a toothed gear through a tooth-retracting mechanism. When the axial feed device drives the boring tool to move forward along the axis of the rotating spindle, the tooth-retracting mechanism drives the toothed gear to disengage from the position of meshing with the radial feed gear. During the axial feed of the boring tool, the toothed gear and the radial feed gear no longer mesh, and the tool no longer feeds radially.

[0019] Preferably, the tooth retraction mechanism includes a first rack, a second rack, and a speed-increasing gear set. The first rack is connected to the conversion transmission mechanism, the second rack is connected to the shifting teeth, the shifting teeth are axially slidably connected to the housing, the first rack meshes with the low-speed input gear of the speed-increasing gear set, and the second rack meshes with the high-speed output gear of the speed-increasing gear set.

[0020] A method for slotting the inner side of a housing, using the aforementioned inner slotting device, comprises the following steps:

[0021] 1) Rotate both ends of the rotating spindle to the bearing seats on both sides of the housing, and connect the gear teeth to the housing;

[0022] 2) Drive the rotary spindle to rotate, and the cutter head drives the conversion transmission mechanism and boring tool to rotate, so as to machine the groove on the inner side of the housing;

[0023] When the cutter head rotates once, the radial feed gear and the feed tooth mesh once, and the screw feed mechanism drives the boring tool to feed radially a fixed distance.

[0024] The process also includes step 3). When the axial feed device drives the boring bar forward along the axis of the rotating spindle, the gear retraction mechanism disengages the shifting gear from its meshing position with the radial feed gear. Furthermore, the speed at which the shifting gear moves backward is greater than the speed at which the boring bar moves forward. During the axial feed of the boring bar, the shifting gear and the radial feed gear no longer mesh, and radial feed ceases. The boring depth remains unchanged. When the axial feed device drives the boring bar back to its initial axial position along the axis of the rotating spindle, the gear retraction mechanism returns the shifting gear to its original position. The cutter head rotates one revolution, and the radial feed gear and the shifting gear mesh again. The screw feed mechanism then drives the boring bar to feed radially a fixed distance. This process repeats to achieve the machining of the groove. This method can machine grooves wider than the boring bar.

[0025] Compared with the prior art, the beneficial effects of this invention are:

[0026] 1. The radial feed gear engages with the shift gear once per revolution, and then the radial feed of the boring tool is achieved through the screw feed mechanism. Radial feed can be completed without rotating the spindle axially. The tool head improves stability and support, preventing the boring tool from vibrating during operation, resulting in high machining accuracy.

[0027] 2. The two ends of the rotating spindle are rotatably connected to the bearing seats on both sides of the housing to ensure that the boring tool rotates along the predetermined axis and ensures the machining accuracy of the groove. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the slotting device inside the housing.

[0029] Figure 2 This is a schematic diagram of the engagement between the radial feed gear and the shifting gear in Example 1.

[0030] Figure 3 This is a schematic diagram of the conversion transmission mechanism and the cutter head in Example 1.

[0031] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle.

[0032] Figure 5This is a top view of the conversion transmission mechanism.

[0033] Figure 6 for Figure 5 Sectional view at point BB.

[0034] Figure 7 The left view shows the conversion transmission mechanism.

[0035] Figure 8 for Figure 6 Sectional view at point CC.

[0036] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the slotting device inside the housing.

[0037] Figure 10 for Figure 9 A magnified view of a section at point D.

[0038] Figure 11 This is a top view of embodiment 3 of the slotting device inside the housing.

[0039] Figure 12 for Figure 11 A magnified view of a section at point E in the middle.

[0040] The components include: 100, pump body; 1, rotating spindle; 2, bearing shell; 3, bearing shell pressure plate; 4, cutter head; 5, positioning block; 6, conversion transmission mechanism; 7, boring tool; 8, radial feed gear; 9, gear; 10, coupling; 11, universal joint; 12, fixed seat; 13, pressure cover; 14, pressure block; 15, slider; 16, screw shaft; 17, washer; 18, lock nut; 19, worm gear; 20, worm; 21, first guide rail; 22, second guide rail; 23, axial feed seat; 24, axial feed motor; 25, bearing seat; 26, connecting rod; 27, gear slide; 28, first rack; 29, second rack; 30, low-speed input gear; 31, intermediate large gear; 32, intermediate small gear; 33, high-speed output gear; 1501, threaded connecting block; 1502, sliding plate. Detailed Implementation

[0041] Figures 1-8 This is the preferred embodiment of the slotting device and method within the housing, described below in conjunction with the appendix. Figures 1-12 The present invention will be further described below.

[0042] Example 1

[0043] Reference Figures 1-3 This embodiment uses a pump body 100 with a split-case pump casing as an example for illustration.

[0044] The grooving device inside the housing includes a rotating spindle 1, a cutter head 4, a conversion transmission mechanism 6, a boring tool 7, a radial feed gear 8, and a grating tooth 9. The two ends of the rotating spindle 1 are located at the bearing seats on both sides of the pump body 100. The cutter head 4 is fixed on the rotating spindle 1 by a positioning block 5. The conversion transmission mechanism 6 is located on the cutter head 4. The radial feed gear 8 is located on the conversion transmission mechanism 6. The radial feed gear 8 and the conversion transmission mechanism 6 rotate with the cutter head 4. The grating tooth 9 is located on the pump body 100. The radial feed gear 8 and the grating tooth 9 mesh once for every revolution of the cutter head 4.

[0045] Both ends of the rotating spindle 1 are rotatably connected to bearing platforms via bearing bushes 2. Bearing bush pressure plates 3 are provided on the upper side of the bearing platforms to fix the bearing bushes 2. One end of the rotating spindle 1 is connected to a universal joint 11 via a coupling 10. The universal joint 11 is connected to a motor to realize the rotation of the rotating spindle 1. The axial position of the rotating spindle 1 can be fixed by means of shaft retaining rings or the like.

[0046] The axis of the radial feed gear 8 is perpendicular to the axis of the rotating spindle 1. The shifting gear 9 is positioned on the rotation path of the radial feed gear 8 as it revolves with the cutter head 4. The specific position of the shifting gear 9 can be set inside the pump body 100 or on the open side of the pump body 100 as needed. The shifting gear 9 is fixed by a fixing bracket, which can be directly fixed to the bolt holes on the open side of the pump body 100 or fixed on a boring machine.

[0047] See Figures 4-8 The conversion transmission mechanism 6 includes a screw feed mechanism, which is connected to a radial feed gear 8. The radial feed gear 8 drives the screw feed mechanism to rotate, and the screw feed mechanism converts rotation into translation and drives the boring tool 7 to move radially along the pump body 100.

[0048] The screw feed mechanism in this embodiment includes a fixed base 12, a screw shaft 16, and a slider 15. The fixed base 12 is fixed on the cutter head 4. The screw shaft 16 is rotatably connected to the fixed base 12. The screw shaft 16 is arranged radially along the cutter head 4. The radial feed gear 8 is coaxially fixed to one end of the screw shaft 16. The radial feed gear 8 drives the screw shaft 16 to rotate. The slider 15 is threadedly connected to the screw shaft 16 and slidably connected to the fixed base 12. The boring tool 7 is fixed on the slider 15.

[0049] The slider 15 includes a slide plate 1502 and a threaded connecting block 1501. The slide plate 1502 is fixed to one side of the threaded connecting block 1501, which is threadedly connected to the screw shaft 16. The two sides of the slide plate 1502 are sliding parts, and the boring tool 7 is fixed on the slide plate 1502. The slide plate 1502 is provided with a fixing groove, and the boring tool 7 is disposed in the fixing groove. The slider 15 is provided with a pressure block 14 for pressing the boring tool 7.

[0050] A pressure cap 13 is fixed on the side of the fixed base 12 away from the cutter head 4. A guide groove is formed between the pressure cap 13 and the fixed base 12. The sliding parts on both sides of the slider 15 are slidably disposed in the guide groove.

[0051] A damping mechanism is provided between the other end of the screw shaft 16 and the fixed base 12. The damping mechanism prevents the screw shaft 16 from rotating undesirably during the operation of the boring tool 7. Specifically, the damping mechanism includes a washer 17 and a locking nut 18. The washer 17 and the locking nut 18 are respectively provided on both sides of the side plate of the fixed base 12. The other end of the screw shaft 16 has a diameter-changing step. The washer 17 is provided at the diameter-changing step. The other end of the screw shaft 16 passes through the locking nut 18 and is connected to the locking nut 18 after passing through the side plate of the fixed base 12. The locking nut 18 locks the screw shaft 16, so that the screw shaft 16 can rotate and also forms a certain rotational damping.

[0052] In this embodiment, the tooth 9 can be fixedly set, or it can be set to slide along the axial direction of the rotating main shaft 1, that is, the tooth 9 and the pump body 100 are relatively fixed in the radial direction of the rotating main shaft 1. By designing the tooth 9 to slide axially, it is possible to select whether to allow the radial feed gear 8 to mesh with the tooth 9 as needed. When radial feed is required, the two can mesh; when radial feed is not required, the tooth 9 is disengaged.

[0053] The pump body grooving method using the above-mentioned pump body grooving device in this embodiment has the following specific steps:

[0054] 1) Rotate the two ends of the rotating spindle 1 to the bearing seats on both sides of the pump body 100, and connect the gear 9 to the pump body 100.

[0055] 2) Drive the rotating spindle 1 to rotate, and the cutter head 4 drives the conversion transmission mechanism 6 and the boring tool 7 to rotate, so as to process the groove on the inner side of the pump body 100; when the cutter head 4 rotates one revolution, the radial feed gear 8 and the shifting gear 9 mesh once, and the screw feed mechanism drives the boring tool 7 to feed radially a fixed distance.

[0056] The radial feed gear 8 engages with the shift gear 9 once per revolution, and then the radial feed of the boring tool 7 is achieved through the screw feed mechanism. Radial feed can be completed without rotating the spindle 1 for axial feed. The tool disc 4 is used to improve stability and support, preventing the boring tool 7 from vibrating during operation, resulting in high machining accuracy.

[0057] Taking a 20-tooth radial feed gear 8 and a screw shaft 16 with a pitch of 2mm as an example, for every revolution of the main spindle 1, the radial feed gear 8 rotates one tooth through contact with the shifting tooth 9, resulting in a tool shank extension of 2 / 20 = 0.1mm. The depth of cut can be adjusted by adjusting the number of teeth and the screw pitch.

[0058] In other embodiments, multiple feed teeth 9 can be provided, and the multiple feed teeth 9 are spaced apart along the rotation path of the radial feed gear 8 as it revolves with the cutter head 4. The radial feed distance can be adjusted multiple times for each revolution of the radial feed gear 8.

[0059] Example 2

[0060] See Figures 9-10 In this embodiment, the radial feed gear 8 is arranged with its axis parallel to the axis of the rotating spindle 1, and the radial feed gear 8 is connected to the screw shaft 16 through an intermediate transmission mechanism. By changing the orientation of the radial feed gear 8, more options can be provided for the fixing method and position of the gear teeth 9.

[0061] Specifically, the intermediate transmission mechanism includes a worm gear 19 and a worm 20. The worm gear 19 is fixedly connected to the screw shaft 16, and the worm 20 meshes with the worm gear 19. The radial feed gear 8 is coaxially fixed to one end of the worm 20.

[0062] The pump body grooving method using the above-mentioned pump body grooving device in this embodiment has the following specific steps:

[0063] 1) Rotate the two ends of the rotating spindle 1 to the bearing seats on both sides of the pump body 100, and connect the gear 9 to the pump body 100.

[0064] 2) Drive the rotary spindle 1 to rotate, and the cutter head 4 drives the conversion transmission mechanism 6 and the boring tool 7 to rotate, so as to process the groove on the inner side of the pump body 100. When the cutter head 4 rotates once, the radial feed gear 8 and the gear 9 mesh once. The radial feed gear 8 drives the screw shaft 16 to rotate through the worm 20 and the turbine 19. After the screw shaft 16 rotates, it drives the boring tool 7 to feed radially a fixed distance through the slider 15.

[0065] Example 3

[0066] See Figures 11-12 In this embodiment, the cutter head 4 is slidably connected to the rotating spindle 1 via a key. The cutter head 4 is connected to an axial feed device. When the required groove width is large, axial feed is required. However, the axial feed distance is significantly less than the meshing distance between the shifting tooth 9 and the radial feed gear 8. If only axial feed is performed and the shifting tooth 9 remains stationary, the radial feed gear 8 will still mesh with the shifting tooth 9 multiple times during the axial feed process, which will result in inconsistent machining depth during the axial feed process.

[0067] Therefore, a tooth retraction mechanism is provided in this embodiment. The axial feed device is connected to the tooth 9 through the tooth retraction mechanism. When the axial feed device drives the boring tool 7 to move forward along the axis of the rotating spindle 1, the tooth retraction mechanism drives the tooth 9 to disengage from the position of meshing with the radial feed gear 8. During the axial feed of the boring tool 7, the tooth 9 no longer meshes with the radial feed gear 8 and no longer feeds radially.

[0068] The axial feed device in this embodiment includes a first guide rail 21, a second guide rail 22, an axial feed motor 24, and an axial feed holder 23. The first guide rail 21 and the second guide rail 22 are respectively fixed on the pump bodies 100 on both sides of the rotating spindle 1. The two ends of the axial feed holder 23 are slidably disposed on the first guide rail 21 and the second guide rail 22, respectively. The output shaft of the axial feed motor 24 is threadedly connected to the axial feed holder 23. The cutter head 4 is provided with a bearing seat 25, which is rotatably connected to the cutter head 4 or the positioning block 5. The axial feed holder 23 is connected to the bearing seat 25 through a connecting rod 26. To maintain stability, the axial feed holder 23 should be connected to the bearing seat 25 through at least two connecting rods 26.

[0069] The tooth-removing mechanism in this embodiment includes a first rack 28, a second rack 29, and a speed-increasing gear set. The tooth 9 is slidably mounted on the first guide rail 21 via a tooth-shifting slide 27. The first rack 28 is connected to the axial feed seat 23, and the second rack 29 is connected to the tooth-shifting slide 27. The first rack 28 meshes with the low-speed input gear 30 of the speed-increasing gear set, and the second rack 29 meshes with the high-speed output gear 33 of the speed-increasing gear set.

[0070] Specifically, the speed-increasing gear set includes a low-speed input gear 30, an intermediate large gear 31, an intermediate small gear 32, and a high-speed output gear 33. The input gear 30, the intermediate large gear 31, and the intermediate small gear 32 mesh sequentially. The high-speed output gear 33 and the intermediate small gear 32 are coaxially arranged. The low-speed input gear 30 meshes with the first rack 28, and the high-speed output gear 33 meshes with the second rack 29.

[0071] The pitch circle diameters of the input gear 30, the intermediate large gear 31, and the intermediate small gear 32 gradually decrease, while the pitch circle diameters of the high-speed output gear 33 and the low-speed input gear 30 are the same. The first rack 28 and the second rack 29 are staggered in the height direction, or the width of the first rack 28 and the second rack 29 is greater than the width of the gear, ensuring that they can mesh with gears at different heights and achieve meshing with the speed-increasing gear set. Utilizing the speed-increasing speed of the speed-increasing gear set, the moving speed of the shifting tooth 9 is greater than the speed of the radial feed gear 8 and the boring tool 7. Thus, when the boring tool 7 moves one radial unit, the shifting tooth 9 can disengage from the meshing position. After the boring tool 7 completes one axial machining cycle and returns to its original position, the shifting tooth 9 returns to the meshing position and meshes with the radial feed gear 8 again to achieve one radial feed.

[0072] The width of the groove to be machined within the pump body 100 is often small, and the moving distance of the gear 9 is not very large. Therefore, the first rack 28, the second rack 29, and the speed-increasing gear set are configured to be always engaged. When the width of the groove to be machined is large and the total axial feed distance of the boring tool 7 is relatively large, the engagement of the first rack 28 and the low-speed input gear 30 can be configured as a separable structure. When the boring tool 7 is in the initial axial machining position, the first rack 28 is engaged with the low-speed input gear 30. After the boring tool 7 moves axially a certain distance, the first rack 28 disengages from the low-speed input gear 30. When the boring tool 7 returns to its original position, the first rack 28 engages with the low-speed input gear 30 again.

[0073] In this embodiment, the speed-increasing gear set is disposed in a gearbox (not shown in the figure). The gearbox is fixed to the pump body 100 by a bracket, or the gearbox is fixed to one side of the first guide rail 21.

[0074] In this embodiment, the grooving method for the pump body 100 using the aforementioned grooving device is as follows:

[0075] 1) Rotate the two ends of the rotating spindle 1 to the bearing seats on both sides of the pump body 100, and connect the gear 9 to the pump body 100.

[0076] 2) Drive the rotating spindle 1 to rotate, and the cutter head 4 drives the conversion transmission mechanism 6 and the boring tool 7 to rotate, so as to process the groove on the inner side of the pump body 100; when the cutter head 4 rotates one revolution, the radial feed gear 8 and the shifting gear 9 mesh once, and the screw feed mechanism drives the boring tool 7 to feed radially a fixed distance.

[0077] 3) When the axial feed device drives the boring bar 7 forward along the axial direction of the rotating spindle 1, the gear retraction mechanism drives the shifting gear 9 to disengage from the radial feed gear 8. Furthermore, the speed at which the shifting gear 9 moves backward is greater than the speed at which the boring bar 7 moves forward. During the axial feed of the boring bar 7, the shifting gear 9 and the radial feed gear 8 no longer mesh, and radial feed ceases. The boring depth remains unchanged. When the axial feed device drives the boring bar 7 to retract back to its initial axial position along the axial direction of the rotating spindle 1, the gear retraction mechanism drives the shifting gear 9 back to its original position. The cutter head 4 rotates one revolution, and the radial feed gear 8 and the shifting gear 9 mesh again. The screw feed mechanism drives the boring bar 7 to feed radially a fixed distance. This reciprocating motion achieves the machining of the groove. This method can machine grooves wider than the boring bar 7.

[0078] In other embodiments, the conversion transmission mechanism 6 is connected to an axial feed device, and the cutter head 4 is fixedly mounted on the rotating spindle 1.

[0079] In other embodiments, the tooth retraction mechanism may also adopt a lead screw structure, which is directly connected to the axial feed motor 24 through a speed-changing gear set. The axial feed motor 24 drives the lead screw structure to move linearly through the speed-changing gear set, and drives the tooth 9 to move linearly, so that the moving speed of the tooth 9 is equal to or greater than the moving speed of the radial feed gear 8, so that the two quickly disengage from the meshing position.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A slotting device for a housing, characterized in that: It includes a rotating spindle (1), a cutter head (4), a conversion transmission mechanism (6), a boring tool (7), a radial feed gear (8), and a pick (9). The cutter head (4) is slidably connected to the rotating spindle (1) by a key. The conversion transmission mechanism (6) is set on the cutter head (4). The radial feed gear (8) is set on the conversion transmission mechanism (6). The radial feed gear (8) and the conversion transmission mechanism (6) rotate with the cutter head (4). The pick (9) and the housing are fixedly set relative to each other in the radial direction of the rotating spindle (1). The radial feed gear (8) and the pick (9) mesh once for each rotation of the cutter head (4). The conversion transmission mechanism (6) connects the radial feed gear (8) and the boring tool (7). The conversion transmission mechanism (6) converts the rotation of the radial feed gear (8) into linear motion and drives the boring tool (7) to move radially along the housing. The cutter head (4) or the conversion transmission mechanism (6) is connected to an axial feed device. The axial feed device is connected to the gear (9) through a tooth retraction mechanism. When the axial feed device drives the boring tool (7) to move forward along the axis of the rotating spindle (1), the tooth retraction mechanism drives the gear (9) to disengage from the position of meshing with the radial feed gear (8). The tooth retraction mechanism includes a first rack (28), a second rack (29) and a speed-increasing gear set. The first rack (28) is connected to the conversion transmission mechanism (6), the second rack (29) is connected to the gear (9), and the gear (9) is axially slidably connected to the housing. The first rack (28) meshes with the low-speed input gear of the speed-increasing gear set, and the second rack (29) meshes with the high-speed output gear of the speed-increasing gear set.

2. The slotting device inside the housing according to claim 1, characterized in that: The conversion transmission mechanism (6) is a screw feed mechanism.

3. The slotting device inside the housing according to claim 2, characterized in that: The screw feed mechanism includes a fixed seat (12), a screw shaft (16) and a slider (15). The fixed seat (12) is fixed on the cutter head (4). The screw shaft (16) is rotatably connected to the fixed seat (12). The screw shaft (16) is arranged radially along the cutter head (4). The radial feed gear (8) is connected to and drives the screw shaft (16) to rotate. The slider (15) is threadedly connected to the screw shaft (16). The slider (15) is slidably connected to the fixed seat (12). The boring tool (7) is fixed on the slider (15).

4. The slotting device inside the housing according to claim 3, characterized in that: The radial feed gear (8) is set perpendicular to the axis of the rotating spindle (1), and the radial feed gear (8) is coaxially fixed to one end of the screw shaft (16); Alternatively, the axis of the radial feed gear (8) is set parallel to the axis of the rotating spindle (1), and the radial feed gear (8) is connected to the screw shaft (16) through an intermediate transmission mechanism.

5. The slotting device inside the housing according to claim 4, characterized in that: The intermediate transmission mechanism includes a worm wheel (19) and a worm (20). The worm wheel (19) is fixedly connected to the screw shaft (16), and the worm (20) meshes with the worm wheel (19). The radial feed gear (8) is coaxially fixed at one end of the worm (20).

6. The slotting device inside the housing according to claim 3, characterized in that: A pressure cap (13) is fixed on the side of the fixed seat (12) away from the cutter head (4). A guide groove is formed between the pressure cap (13) and the fixed seat (12). A guide sliding part is provided on the slider (15) and is slidably disposed in the guide groove.

7. The slotting device inside the housing according to claim 6, characterized in that: The slider (15) includes a slide plate (1502) and a threaded connecting block (1501). The slide plate (1502) is fixed on one side of the threaded connecting block (1501). The threaded connecting block (1501) is threadedly connected to the screw shaft (16). The two sides of the slide plate (1502) are guide sliding parts. The boring tool (7) is fixed on the slide plate (1502).

8. A method for slotting the inner side of a housing, characterized in that: The specific steps of using the internal slotting device for the housing according to any one of claims 1-7 are as follows: 1) Rotate the two ends of the rotating spindle (1) to the bearing seats on both sides of the housing, and connect the gear (9) to the housing; 2) Drive the rotating spindle (1) to rotate, and the cutter head (4) drives the conversion transmission mechanism (6) and the boring tool (7) to rotate, so as to realize the machining of the groove on the inner side of the housing; The cutter head (4) rotates once, the radial feed gear (8) meshes with the shift gear (9) once, and the transmission mechanism (6) drives the boring tool (7) to feed a fixed distance radially; 3) When the axial feed device drives the boring bar (7) to move forward along the axis of the rotating spindle (1), the tooth retraction mechanism drives the tooth (9) to disengage from the position of meshing with the radial feed gear (8), and the speed of the tooth (9) moving backward is greater than the speed of the boring bar (7) moving forward. During the axial feed of the boring bar (7), the tooth (9) and the radial feed gear (8) no longer mesh, and the radial feed is no longer performed. The boring depth remains unchanged. When the axial feed device drives the boring bar (7) to retract to the initial axial position along the axis of the rotating spindle (1), the tooth retraction mechanism drives the tooth (9) to return to its original position. The cutter head (4) rotates once, and the radial feed gear (8) and the tooth (9) mesh again. The transmission mechanism (6) drives the boring bar (7) to feed a fixed distance radially. This process is repeated to achieve the machining of the groove.

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