A water pump housing drilling device

Abstract

The application relates to the technical field of water pump shell processing equipment, in particular to a water pump shell drilling device which comprises a processing table, a transverse moving frame is installed on the processing table, an upper shell is installed on the transverse moving frame, a lower shell is slidably connected to the inner wall of the upper shell, a spline rotating shaft is movably inserted into the inner wall of the lower shell, a ring-shaped flange is fixedly sleeved on the upper end of the side surface of the spline rotating shaft, a drill bit is detachably installed at the bottom of the spline rotating shaft, a first bearing is fixedly sleeved on the side surface, and the lower end of the outer ring of the first bearing abuts against the bottom surface of the inner wall of the lower shell. The water pump shell drilling device is provided with a telescopic buffer structure composed of an inner rod, an outer cylinder and a compression spring, when the drill bit abuts against the water pump shell, the compression spring can absorb the cutting reaction force, rigid contact and polishing of the drill bit and the workpiece surface are avoided, the abrasion of the drill bit is effectively reduced, and the drilling quality is improved.

Description

Technical Field

[0001] This invention relates to the field of water pump housing processing equipment technology, specifically a water pump housing drilling device. Background Technology

[0002] As the core basic component of a water pump, the pump housing needs to have multiple mounting holes machined on its surface for connection and sealing. The quality of the drilling directly affects the assembly accuracy and service life of the water pump.

[0003] In existing technologies, pump housing drilling devices generally employ a rigid feed structure, resulting in rigid contact between the drill bit and the workpiece. However, during actual machining, the pump housing material may exhibit inhomogeneity, often containing casting defects such as sand holes and hard spots. When the drill bit encounters these hard spots, it generates significant cutting resistance. Continuing with rigid feed can easily cause the drill bit to chip or break, increasing tool costs and leading to workpiece scrap, thus impacting production efficiency.

[0004] In addition, existing drilling devices cannot flexibly adjust the contact pressure between the drill bit and the workpiece according to the material hardness and processing requirements of the water pump housing, resulting in poor adaptability. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling device for a water pump housing to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a drilling device for a water pump housing, including a processing table, a transverse moving frame mounted on the processing table, an upper housing mounted on the transverse moving frame, a lower housing slidably connected to the inner wall of the upper housing, a spline rotating shaft movably inserted through the inner wall of the lower housing, an annular flange fixedly sleeved on the upper side of the spline rotating shaft, a drill bit detachably mounted on the bottom, a first bearing fixedly sleeved on the side, and the lower end of the outer ring of the first bearing abutting the bottom surface of the inner wall of the lower housing; The outer ring of the first bearing is hinged to the inner rod, and the splined outer wall of the inner rod is sleeved to the outer cylinder, forming a telescopic buffer support structure. The outer cylinder end face is rotatably connected to a threaded rod. One end of the threaded rod extends into the outer cylinder and is threadedly connected to a pressure plate. The pressure plate is slidably set in a groove on the inner wall of the outer cylinder. A compression spring in a compressed state is set between the pressure plate and the inner rod. The other end of the threaded rod is fixedly connected to a universal coupling. One end of the universal coupling passes through the through groove on the side of the lower housing and is fixedly connected to a bevel gear. The bevel gear is rotatably set in the through groove. The outer wall of the lower housing is rotatably fitted with a bevel gear ring, which meshes with a bevel gear to form a pre-pressure adjustment mechanism. This mechanism is used to drive the pressure plate to slide and adjust the pre-pressure of the pressure spring, thereby adjusting the contact pressure between the drill bit and the workpiece.

[0006] Preferably, a second bearing is movably sleeved on the outer wall of the spline rotating shaft, and the outer ring of the second bearing is fixed to the inner wall of the lower housing; a driven bevel gear is fixedly sleeved on the upper end of the inner ring of the second bearing, the driven bevel gear meshes with the driving bevel gear, the end face of the driving bevel gear is fixedly connected to the motor output shaft, and the motor is fixed to the inner wall of the lower housing.

[0007] Preferably, an L-shaped limiting slide rail is fixedly installed on the top of the inner wall of the upper housing. The horizontal plate of the L-shaped limiting slide rail is fixedly connected to a toothed plate, and the vertical plate is fixedly connected to a limiting plate. A low-speed motor is slidably installed on the back side, and the housing of the low-speed motor is fixedly connected to the inner wall of the lower housing. The output shaft of the low-speed motor is fixedly connected to a worm gear, which meshes with a worm wheel. The worm wheel moves through the rotating shaft, and there is rotational friction between the rotating shaft and the central shaft hole of the worm wheel. A damping spring telescopic rod is sleeved on the rotating shaft, and the upper end of the damping spring telescopic rod is fixed to the top surface of the inner wall of the upper housing. The left end face of the worm gear has three arc grooves arranged in a ring, and the right end face is fixedly connected to three arc-shaped tooth plates, which can intermittently mesh with the tooth plates. The right end of the rotating shaft is eccentrically connected to a spring telescopic rod, the inner end of which is inclined and one end abuts against the limiting plate; the left end of the rotating shaft is provided with a limiting slide groove, which is fixed to the top surface inside the upper housing.

[0008] Preferably, a cam is fixedly connected to the middle of the rotating shaft, and the cam is located directly above the spline rotating shaft; a return spring telescopic rod is fixedly connected to the right end face of the cam, and a friction protrusion is fixedly connected to the inner rod of the return spring telescopic rod, with the side of the friction protrusion abutting against the arc-shaped plate; The arc-shaped plate is hinged to the housing of the low-speed motor in the middle, and a torsion spring is set between the arc-shaped plate and the housing of the low-speed motor for the arc-shaped plate to deflect and reset; a push rod is hinged to the end of the arc-shaped plate away from the friction protrusion, and a lifting rod is hinged to the lower end of the push rod. One end of the lifting rod is hinged to the housing of the low-speed motor, and the other end is located on one side above the upper end of the spline rotating shaft.

[0009] Preferably, one side of the arc-shaped plate has an arc-shaped inclined surface to guide the friction protrusion to slide and reset.

[0010] Preferably, a fixture is provided on the processing table to hold and fix the water pump housing workpiece.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention features flexible buffer protection: a telescopic buffer structure composed of an inner rod, an outer cylinder, and a compression spring. When the drill bit contacts the water pump housing, the compression spring absorbs the cutting reaction force, preventing the drill bit from rigidly contacting and grinding the workpiece surface. This effectively reduces drill bit wear and improves drilling quality.

[0012] This invention features adjustable pressure: rotating the bevel gear ring can drive the bevel gear, universal coupling, and threaded rod to rotate, thereby driving the pressure plate to slide inside the outer cylinder. This allows for precise adjustment of the preload of the pressure spring and flexible adjustment of the drill bit's contact pressure according to different materials and hardness of the water pump housing, thus expanding the applicability of the device.

[0013] This invention features an automatic tool avoidance mechanism: when the drill bit contacts a hard point inside the water pump housing and cannot move downwards, the reaction force pushes the spline rotating shaft and the first bearing upwards, causing the inner rod and outer cylinder to deflect, thus automatically separating the drill bit from the water pump housing. This avoids drill bit damage caused by rigid drilling and significantly reduces tool costs and workpiece scrap rate.

[0014] This invention features an automatic reset and re-drilling mechanism: Simultaneously with the drill bit automatically retracting, the annular flange at the upper end of the spline rotating shaft triggers a linkage between the lifting rod, push rod, and arc-shaped plate, releasing the constraint on the friction protrusion and allowing the cam to rotate synchronously with the worm gear. During cam rotation, the rotating shaft first separates from the limiting plate, and the lower housing is pulled upwards and reset via a damping spring telescopic rod. Subsequently, the cam continues to rotate, pressing the spline rotating shaft downwards to complete the drill bit's extension and reset. The device can automatically re-drill at this position without manual intervention, significantly improving processing efficiency and automation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the bevel gear and bevel gear ring of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the upper and lower shells of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the outer cylinder of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the upper shell of the present invention; Figure 6 This is a three-dimensional structural diagram of the toothed plate, the limiting plate, and the low-speed motor of the present invention; Figure 7 This is a three-dimensional structural diagram of the resetting spring telescopic rod and friction protrusion of the present invention; Figure 8 This is a three-dimensional structural diagram of the spring telescopic rod and cam of the present invention.

[0016] In the diagram: 1. Machining table; 2. Lateral moving frame; 3. Upper housing; 4. Lower housing; 41. Splined rotating shaft; 42. Drill bit; 43. First bearing; 44. Inner rod; 45. Outer cylinder; 46. Threaded rod; 47. Pressure plate; 48. Compression spring; 49. Universal coupling; 410. Bevel gear; 411. Bevel gear ring; 412. Second bearing; 413. Driven bevel gear; 414. Driving bevel gear; 415. Motor; 5. L-shaped limit switch. 51. Slide rail; 52. Toothed plate; 53. Limiting plate; 54. Low-speed motor; 55. Worm gear; 56. Rotating shaft; 57. Spring telescopic rod; 58. Cam; 59. Return spring telescopic rod; 510. Friction protrusion; 511. Arc plate; 512. Push rod; 513. Lifting rod; 514. Arc groove; 515. Arc toothed plate; 516. Damping spring telescopic rod; 517. Torsion spring; 518. Limiting slide groove; 6. Fixture. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1 to 8 The present invention provides a technical solution: a drilling device for a water pump housing, including a processing table 1, a transverse moving frame 2 installed on the processing table 1, an upper housing 3 installed on the transverse moving frame 2, an infrared sensor and an alarm installed on the inner wall of the upper housing 3, the infrared sensor being electrically connected to a driver, the driver being installed on the inner wall of the upper housing 3, and the driver being electrically connected to the alarm. The inner wall of the upper housing 3 is slidably connected to the lower housing 4. A spline rotating shaft 41 is movably inserted through the inner wall of the lower housing 4. An annular flange is fixedly sleeved on the upper side of the spline rotating shaft 41. A drill bit 42 is detachably installed at the bottom of the spline rotating shaft 41. A first bearing 43 is fixedly sleeved on the side of the spline rotating shaft 41, and the lower end of the outer ring of the first bearing 43 abuts against the bottom surface of the inner wall of the lower housing 4. An inner rod 44 is hinged to the outer ring of the first bearing 43. An outer cylinder 45 is spline-sleeved on the outer wall of the inner rod 44, and the inner rod 44 and the outer cylinder 45 form a telescopic structure. A threaded rod 46 is rotatably connected to the end face of the outer cylinder 45. One end of the threaded rod 46 extends into the outer cylinder 45 and is threadedly connected to a pressure plate 47. The pressure plate 47 is slidably disposed in a groove opened in the inner wall of the outer cylinder 45. A compression spring 48 in a compressed state is provided on the side of the pressure plate 47 opposite to the inner rod 44. The other end of the threaded rod 46 is fixedly connected to a universal coupling 49, and one end of the universal coupling 49 passes through a through slot on the side of the lower housing 4 and is fixedly connected to a bevel gear 410. The bevel gear 410 is rotatably disposed in the through slot. A bevel gear ring 411 is rotatably connected to the outer wall of the lower housing 4. The bevel gear ring 411 meshes with the bevel gear 410 and is rotatably sleeved on the outer wall of the lower housing 4. By rotating the bevel gear ring 411, the bevel gear 410 is driven to rotate, which causes the universal coupling 49 to drive the threaded rod 46 to rotate, causing the pressure plate 47 to slide inside the outer cylinder 45, thereby adjusting the preload of the compression spring 48, and thus achieving the purpose of adjusting the contact pressure between the drill bit 42 and the water pump housing.

[0019] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a second bearing 412 is movably sleeved on the outer wall of the spline rotating shaft 41, and the outer ring of the second bearing 412 is fixed on the inner wall of the lower housing 4. A driven bevel gear 413 is fixedly sleeved on the upper end of the inner ring of the second bearing 412. A driving bevel gear 414 meshes on the driven bevel gear 413. The end face of the driving bevel gear 414 is fixedly connected to the output shaft of the motor 415, and the motor 415 is fixed on the inner wall of the lower housing 4.

[0020] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, an L-shaped limiting slide rail 5 is fixedly installed on the top of the inner wall of the upper housing 3. A toothed plate 51 is fixedly connected to the horizontal plate of the L-shaped limiting slide rail 5. A limiting plate 52 is fixedly connected to the vertical plate of the L-shaped limiting slide rail 5. A low-speed motor 53 is slidably installed on the back of the L-shaped limiting slide rail 5. The housing of the low-speed motor 53 is fixedly connected to the inner wall of the lower housing 4. A worm 54 is fixedly connected to the output shaft of the low-speed motor 53. A worm wheel 55 meshes on the worm 54. A rotating shaft 56 is movably passed through the worm wheel 55. When the rotating shaft 56 rotates, its surface rubs against the central shaft hole of the worm wheel 55. A damping spring telescopic rod 516 is sleeved on the rotating shaft 56. The upper end of the damping spring telescopic rod 516 is fixed to the top surface of the inner wall of the upper housing 3. The left end face of the worm gear 55 has three arc grooves 514 arranged in a ring, and the right end face of the worm gear 55 has three arc-shaped toothed plates 515 fixedly connected, and the arc-shaped toothed plates 515 can intermittently mesh with the toothed plates 51 when they rotate.

[0021] A spring telescopic rod 57 is eccentrically fixed to the right end of the rotating shaft 56. The inner end of the spring telescopic rod 57 is inclined, and one end of the inner rod abuts against the limiting plate 52. A limiting groove 518 is provided at the left end of the rotating shaft 56, and the limiting groove 518 is fixed to the inner top surface of the upper housing 3. This is used to ensure that the rotating shaft 56 slides stably downward within the limiting groove 518.

[0022] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a cam 58 is fixedly connected to the middle of the rotating shaft 56, and the cam 58 is directly above the spline rotating shaft 41. A return spring telescopic rod 59 is fixedly connected to the right end face of the cam 58. A friction protrusion 510 is fixedly connected to the inner rod of the return spring telescopic rod 59. An arc plate 511 abuts against the side of the friction protrusion 510. After the arc plate 511 deflects and releases the restriction on the friction protrusion 510, the return spring telescopic rod 59 extends and abuts against the arc groove 514, and rotates simultaneously with the worm gear 55. The arc-shaped plate 511 is hinged to the housing of the low-speed motor 53 at its middle part, and a torsion spring 517 is provided between the arc-shaped plate 511 and the housing of the low-speed motor 53 for resetting the arc-shaped plate 511 after deflection. A push rod 512 is hinged to the end of the arc-shaped plate 511 away from the friction protrusion 510. A lifting rod 513 is hinged to the lower end of the push rod 512, and one end of the lifting rod 513 is hinged to the housing of the low-speed motor 53. The other end of the lifting rod 513 is located on the side above the upper end of the spline rotating shaft 41. When the annular flange at the upper end of the spline rotating shaft 41 moves upward, it presses the end of the lifting rod 513 away from the low-speed motor 53, causing the lifting rod 513 to deflect. After the spline rotating shaft 41 separates from the end of the lifting rod 513, the lifting rod 513 deflects and resets under the action of the torsion spring 517.

[0023] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, one side of the arc-shaped plate 511 has an arc-shaped inclined surface.

[0024] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 8 As shown, a clamp 6 is provided on the processing table 1 to hold the water pump housing.

[0025] The method of use and advantages of this invention: The working process of this water pump housing drilling device is as follows: like Figure 1 , Figure 2 , Figure 3, Figure 4 , Figures 5 to 8 As shown, when drilling a hole in the pump housing, the device first fixes the pump housing with the clamp 6, and then controls the movement of the upper housing 3 by the transverse moving frame 2 to adjust the position of the drill bit 42. The starting motor 415 drives the active bevel gear 414 to rotate, which causes the driven bevel gear 413 to drive the spline rotating shaft 41 and the drill bit 42 at its lower end to rotate. Then, the low-speed motor 53 runs and cooperates with the worm gear 54 to drive the worm wheel 55 to rotate, which causes the worm wheel 55 to drive the arc-shaped toothed plate 515 on its right end face to rotate counterclockwise. When the arc-shaped toothed plate 515 meshes with the toothed plate 51, it drives the worm wheel 55 to move down, which causes the spring telescopic rod 57 at the end of the rotating shaft 56 to move down on the limit plate 52, which in turn causes the low-speed motor 53 and the lower housing 4 to move down at the same time, driving the rotating drill bit 42 to drill a hole in the water pump housing. When the drill bit 42 comes into contact with the water pump housing, the reaction force of the water pump housing is transmitted to the inner rod 44, causing the inner rod 44 to slide inside the outer cylinder 45, thereby compressing the compression spring 48 and preventing the drill bit 42 from making rigid contact with the surface of the water pump housing and grinding. During the drilling process of the drill bit 42 into the water pump housing, when it encounters a hard point inside the housing and cannot move downwards, the drill bit 42 drives the first bearing 43 and the spline rotating shaft 41 to continue moving upwards. This causes the inner rod 44 to move into the outer cylinder 45, compressing the compression spring 48 and simultaneously deflecting it. When the outer cylinder 45 and the inner rod 44 deflect to a horizontal position and continue to deflect upwards, the compression spring 48 extends, working in conjunction with the inner rod 44 to push the first bearing 43, the spline rotating shaft 41, and the drill bit 42 upwards and downwards towards the cam 58. At this point, the drill bit 42 separates from the water pump housing. To prevent damage to the drill bit 42 during rigid drilling; when the spline rotating shaft 41 moves upward with the drill bit 42 and comes into contact with the cam 58, the spline rotating shaft 41 interferes with the detection optical path of the infrared sensor, causing an anomaly in the light signal at the receiving end of the infrared sensor; the infrared sensor then transmits a trigger signal to the driver, and after receiving the signal, the driver drives the alarm to output an alarm signal to indicate that there is a defect in the water pump housing at the current processing station, and then the operator can promptly replace the water pump housing; Furthermore, during the upward movement of the spline rotating shaft 41, the annular flange on its upper side presses against one end of the lifting rod 513, causing it to deflect. In this process, the push rod 512 also presses against the arc plate 511, causing it to deflect around its hinge point with the low-speed motor 53. This releases the arc plate 511 from the constraint of the friction protrusion 510. At this time, the return spring extension rod 59 extends and abuts against the arc groove 514 on the end face of the worm gear 55, thereby causing the cam 58 to rotate counterclockwise simultaneously with the worm gear 55. During the counterclockwise rotation of the cam 58, it also... The spring telescopic rod 57 at one end of the rotating shaft 56 rotates 90 degrees, causing the spring telescopic rod 57 to separate from the limit plate 52. At this time, the damping spring telescopic rod 516 retracts and pulls the rotating shaft 56 and the lower housing 4 upward, completing the upward reset of the lower housing 4. After the lower housing 4, the spline rotating shaft 41 and the drill bit 42 are reset downward and disengaged from the contact state with the cam 58, the detection optical path of the infrared sensor returns to normal, the light signal at the receiving end returns to the reference state, the infrared sensor stops sending trigger signals to the driver, and the driver controls the alarm to deactivate the alarm state. At this time, the cam 58 continues to rotate with the worm gear 55 to complete one revolution, thereby squeezing the spline rotating shaft 41 at its lower end to move down in the second bearing 412, pushing the spline rotating shaft 41, the first bearing 43 and the drill bit 42 to move down, causing the inner rod 44 and the outer cylinder 45 to deflect and reset, completing the drill bit 42 to extend and reset, making it convenient to re-drill the hole in this part of the replaced water pump housing; Furthermore, when the cam 58 completes one rotation, the friction protrusion 510 at the end of the return spring telescopic rod 59 abuts against the arc plate 511 again and slides along the arc-shaped inclined surface of the arc plate 511, pulling the return spring telescopic rod 59 to compress and pull it out of the arc groove 514, thus completing the separation of kinetic energy from the worm gear 55. Then, the low-speed motor 53 drives the worm gear 54 to rotate, and continues to work with the arc-shaped toothed plate 515 to move the lower housing 4 and the drill bit 42 down to drill a hole in the water pump housing again.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drilling device for a water pump housing, comprising a processing table (1), a transverse moving frame (2) mounted on the processing table (1), an upper housing (3) mounted on the transverse moving frame (2), and a lower housing (4) slidably connected to the inner wall of the upper housing (3), characterized in that: The spline rotating shaft (41) is movably inserted into the inner wall of the lower housing (4). An annular flange is fixedly sleeved on the upper side of the spline rotating shaft (41). A drill bit (42) can be detachably installed at the bottom. The first bearing (43) is fixedly sleeved on the side. The lower end of the outer ring of the first bearing (43) abuts against the bottom surface of the inner wall of the lower housing (4). The outer ring of the first bearing (43) is hinged to the inner rod (44), and the outer wall of the inner rod (44) is splined to the outer cylinder (45), forming a telescopic buffer support structure; The outer cylinder (45) end face is rotatably connected to the threaded rod (46), one end of the threaded rod (46) extends into the outer cylinder (45) and is threadedly connected to the pressure plate (47). The pressure plate (47) is slidably set in the groove of the inner wall of the outer cylinder (45), and a compression spring (48) in a compressed state is set between the pressure plate (47) and the inner rod (44). The other end of the threaded rod (46) is fixedly connected to a universal coupling (49). One end of the universal coupling (49) passes through the side groove of the lower housing (4) and is fixedly connected to a bevel gear (410). The bevel gear (410) is rotatably set in the groove. The outer wall of the lower housing (4) is rotatably fitted with a bevel gear ring (411). The bevel gear ring (411) meshes with the bevel gear (410) to form a pre-pressure adjustment mechanism, which is used to drive the pressure plate (47) to slide and adjust the pressure spring (48) pre-pressure, thereby adjusting the contact pressure between the drill bit (42) and the workpiece.

2. The water pump housing drilling device according to claim 1, characterized in that: The outer wall of the spline rotating shaft (41) is movably sleeved with the second bearing (412), and the outer ring of the second bearing (412) is fixed to the inner wall of the lower housing (4); the upper end of the inner ring of the second bearing (412) is fixedly sleeved with the driven bevel gear (413), the driven bevel gear (413) meshes with the driving bevel gear (414), the end face of the driving bevel gear (414) is fixedly connected to the output shaft of the motor (415), and the motor (415) is fixed to the inner wall of the lower housing (4).

3. The water pump housing drilling device according to claim 2, characterized in that: An L-shaped limiting slide rail (5) is fixedly installed on the top of the inner wall of the upper shell (3). The horizontal plate of the L-shaped limiting slide rail (5) is fixedly connected to the toothed plate (51), and the vertical plate is fixedly connected to the limiting plate (52). A low-speed motor (53) is set on the back limit sliding. The outer shell of the low-speed motor (53) is fixedly connected to the inner wall of the lower shell (4). The output shaft of the low-speed motor (53) is fixedly connected to the worm (54). The worm (54) meshes with the worm wheel (55). The worm wheel (55) moves through the rotating shaft (56). There is rotational friction between the rotating shaft (56) and the central shaft hole of the worm wheel (55). A damping spring telescopic rod (516) is sleeved on the rotating shaft (56). The upper end of the damping spring telescopic rod (516) is fixed on the top surface of the inner wall of the upper shell (3). The left end face of the worm gear (55) has three arc grooves (514) arranged in a ring, and the right end face is fixedly connected to three arc-shaped toothed plates (515). The arc-shaped toothed plates (515) can intermittently mesh with the toothed plates (51). The right end of the rotating shaft (56) is eccentrically fixed to the spring telescopic rod (57). The inner end of the spring telescopic rod (57) is inclined, and one end abuts against the limiting plate (52). The left end of the rotating shaft (56) is provided with a limiting slide groove (518), which is fixed to the top surface inside the upper shell (3).

4. The water pump housing drilling device according to claim 3, characterized in that: A cam (58) is fixedly connected to the middle of the rotating shaft (56), and the cam (58) is located directly above the spline rotating shaft (41); The right end face of the cam (58) is fixedly connected to the return spring telescopic rod (59), the inner rod of the return spring telescopic rod (59) is fixedly connected to the friction protrusion (510), and the side of the friction protrusion (510) abuts against the arc plate (511). The arc plate (511) is hinged in the middle to the housing of the low-speed motor (53), and a torsion spring (517) is provided between the arc plate (511) and the housing of the low-speed motor (53) for deflection and reset. The end of the arc plate (511) away from the friction protrusion (510) is hinged to the push rod (512), and the lower end of the push rod (512) is hinged to the lifting rod (513). One end of the lifting rod (513) is hinged to the housing of the low-speed motor (53), and the other end is located on one side above the upper end of the spline rotating shaft (41).

5. The water pump housing drilling device according to claim 4, characterized in that: The arc plate (511) has an arc-shaped inclined surface on one side to guide the friction protrusion (510) to slide and reset.

6. The water pump housing drilling device according to claim 1, characterized in that: A fixture (6) is set on the processing table (1) to hold and fix the water pump housing workpiece.

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