A water meter housing drilling device

Abstract

The application relates to the technical field of drilling devices, in particular to a water meter shell drilling device which comprises a numerical control drilling machine tool body, a workpiece clamping mechanism is arranged at the upper end center position of the numerical control drilling machine tool body, and drilling mechanisms are arranged at the two sides of the workpiece clamping mechanism. The device combines a synchronous multi-hole drilling unit and an inner tube fillet drilling and milling unit, can simultaneously perform synchronous punching on multiple flange holes of a water meter shell, can satisfy fillet drilling and milling of an inner tube flange of the water meter shell, can realize integrated machining of the water meter shell drilling, can realize convenient assembly of a drilling part through mutual cooperation of a base part and an end cover part, can enhance the torsion resistance and bending resistance of a central rod body, can reduce deformation during high-speed rotation, can transport lubricating oil through a hollow cavity, can directly reach each key part, and can realize local precise oil supply.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, specifically a drilling device for a water meter casing. Background Technology

[0002] Drilling of water meter casings refers to the process of machining connection holes on the water meter casing according to design requirements using specialized equipment (such as CNC drilling machines, automated drilling devices, etc.). Its core purpose is to provide a high-precision and high-reliability sealed connection interface between the water meter and the pipeline system, ensuring the stability of water flow measurement and transmission, and meeting the sealing connection requirements between the water meter and the pipeline system.

[0003] In existing technologies, such as the CNC drilling machine tool disclosed in CN112872412A, iron powder carried by the waste material is adsorbed by the powder suction pipe to prevent the iron powder from entering the acceleration device and the fan. The crushing rod is made to rotate at high speed by the cooperation of the fan and the acceleration device, which can easily break the waste material and prevent long strips of waste material from getting stuck in the pipe. However, in actual use, the drilling structure is simple. Not only is it necessary to drill the workpiece one by one, but the rounding milling of the inner tube of the workpiece also needs to be completed in the next step, resulting in low drilling efficiency.

[0004] Therefore, this invention proposes a drilling device for water meter housings to solve the problems of simple drilling structure and low drilling efficiency of existing drilling devices. It can simultaneously drill multiple flange holes in the water meter housing while also satisfying the rounded corner drilling and milling of the inner tube of the flange in the water meter housing, thus realizing integrated drilling and processing of the water meter housing. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a drilling device for water meter housings to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drilling device for a water meter casing, comprising a CNC drilling machine body, a workpiece clamping mechanism disposed at the upper center of the CNC drilling machine body, and drilling mechanisms disposed on both sides of the workpiece clamping mechanism, the drilling mechanism comprising a sliding limit mounting bracket, a synchronous multi-hole drilling unit, and an inner tube rounded corner drilling and milling unit, the sliding limit mounting bracket being slidably mounted on the upper side of the CNC drilling machine body, a motor being fixedly mounted on the upper end of the sliding limit mounting bracket, a pulley assembly being fixedly connected to the output shaft of the motor, the inner tube rounded corner drilling and milling unit comprising a base portion, the base portion being fixedly mounted on the inner side of the sliding limit mounting bracket, and the... The base portion, away from the workpiece clamping mechanism, is connected to a pulley assembly. The synchronous multi-hole drilling unit includes an end cap portion located on the base portion near the workpiece clamping mechanism. A drilling component is provided on the end cap portion. A threaded sealing plate is threadedly connected to the center of the end cap portion. A central rod is provided through the center of the base portion and the threaded sealing plate. A hollow cavity is opened in the center of the central rod. A tapered end body one and a tapered end body two are threadedly connected to the two ends of the central rod, respectively. A connecting rib is fixedly connected between the tapered end body one and the tapered end body two. The inner side of the threaded sealing plate is rotatably connected to the outer surface of the central rod through a bearing. An in-tube rounded corner drilling and milling cutter is provided on the inner side of the central rod.

[0007] Preferably, a filling plug is movably installed at one end of the central rod near the pulley assembly, a retention groove is provided at one end of the hollow cavity near the filling plug, and a first reserved hole is uniformly provided on the inner wall of the retention groove, and an inner convex slope is fixedly installed on the inner wall of the hollow cavity away from the filling plug, and an adsorption groove is set on the side of the inner convex slope near the threaded sealing plate, and a second reserved hole is uniformly provided on the inner wall of the adsorption groove.

[0008] Preferably, the first conical end body and the second conical end body are mirror images of each other about the central axis of the base portion. The inner walls of the first conical end body and the second conical end body are respectively provided with a liquid guiding groove and a liquid guiding groove. The input end of the first liquid guiding groove corresponds to the reserved hole one, and the input end of the second liquid guiding groove corresponds to the reserved hole two.

[0009] Preferably, the end cap is fixedly connected to one end of the base by bolts, and a C-shaped retaining ring is fixedly installed on the inner annular surface of the end cap. The drilling component consists of a drive motor and a drill bit. The inner annular surface of the C-shaped retaining ring is fixedly connected to the outer surface of the drive motor, and the outer surface of the drill bit is rotatably connected to the inner wall of the end cap.

[0010] Preferably, the in-tube rounded corner drilling and milling cutter is integrally formed from a cutter shank and a cutter body. One end of the cutter shank is threadedly connected to a screw plate, which is fixedly installed on the inner side of the adsorption groove. An oil wiping cotton block is attached to the end of the screw plate away from the cutter body, and the outer surface of the oil wiping cotton block is in movable contact with one side of the inner convex retaining slope.

[0011] Preferably, a horizontal groove is formed at the center of the blade holder, and a cross groove is formed on the inner wall of the blade body. The horizontal groove and the cross groove are interconnected to form a receiving groove, and an extrusion member is slidably installed on the inner side of the receiving groove.

[0012] Preferably, the extrusion component consists of a push rod and a cross connecting claw, wherein the push rod and the cross connecting claw are integrally formed, and the outer surface of the end of the push rod away from the cross connecting claw is slidably connected to the central inner wall of the screw plate.

[0013] Preferably, the outer surface of the push rod is slidably connected to the inner wall of the horizontal groove, the cross connecting claw is slidably installed on the inner side of the cross groove, and an abutment ring is fixedly connected to the outer surface of the end of the cross connecting claw away from the push rod.

[0014] Preferably, the horizontal slide groove has an enlarged diameter groove on the side away from the cross groove. The diameter of the enlarged diameter groove is larger than the diameter of the horizontal slide groove and the two are interconnected. A spring is provided on the inner side of the enlarged diameter groove, and the spring is slidably sleeved on the outer side of the push rod.

[0015] Preferably, a fixing ring is fixedly installed on one side of the outer surface of the push rod, one side of the fixing ring is fixedly connected to one end of the spring, and the other end of the screw plate is fixedly connected to the inner wall of the expansion groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention proposes a drilling device for water meter housings. This device combines a synchronous multi-hole drilling unit and an inner tube rounding milling unit to simultaneously drill multiple flange holes in the water meter housing while simultaneously performing rounding milling on the inner tube of the flange, achieving integrated drilling processing of the water meter housing. The base and end cap work together to facilitate convenient assembly of the drilled parts. Furthermore, the combination of the central rod, conical end body one, conical end body two, and connecting ribs enhances the torsional and bending resistance of the central rod, reduces deformation during high-speed rotation, and allows for lubricant delivery through the hollow cavity, directly reaching key components for precise localized oil supply, reducing lubricant waste and facilitating convenient oiling, further improving the efficiency of water meter housing drilling. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a front view of the present invention.

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0021] Figure 4 For the present invention Figure 3 A magnified structural diagram at point A;

[0022] Figure 5 For the present invention Figure 3 A magnified structural diagram at point B;

[0023] Figure 6 This is a schematic diagram of the disassembly structure of the protective cover and the single drilling mechanism of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the base portion of the present invention;

[0025] Figure 8 This is a schematic cross-sectional view of the sliding limiting mounting bracket and base portion AA of the present invention;

[0026] Figure 9 This is a schematic diagram of the disassembly structure of the in-tube fillet drilling and milling tool and the central rod of the present invention;

[0027] Figure 10 This is a schematic diagram of the internal structure of the central rod of the present invention;

[0028] Figure 11 This is a three-dimensional structural diagram of the extrusion component of the present invention;

[0029] Figure 12 This is a schematic cross-sectional view of the sliding limiting mounting bracket and the base portion at point BB of the present invention;

[0030] Figure 13 This is a schematic diagram of the inner side view of the end cap portion of the present invention.

[0031] In the diagram: 1. CNC drilling machine body; 11. Water meter housing mounting base; 12. Water meter housing fixing component; 2. Sliding limit mounting bracket; 21. Motor; 22. Pulley assembly; 23. Protective cover; 3. Base; 31. Heat dissipation fins; 32. Central rod; 320. Hollow cavity; 3201. Retention groove; 3202. Adsorption groove; 321. Filling plug; 322. Inner convex slope; 33. Conical end body one; 330. Liquid guiding groove one; 331. Reinforcing ring; 332. Bearing component; 34. Conical 340. Liquid guiding groove 2; 341. Annular brush; 35. Connecting rib plate; 4. End cap; 40. C-type retaining ring; 41. Threaded sealing plate; 42. Drilling part; 43. In-pipe rounded corner drilling and milling cutter; 431. Tool shank; 4310. Horizontal slide groove; 432. Tool body; 4320. Cross groove; 433. Push rod; 4330. Fixed abutment ring; 4331. Cross connecting claw; 4332. Abutment ring; 434. Spring; 435. Threaded plate; 436. Oil wiping cotton block. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0033] Example 1, please refer to Figure 1-13This invention provides a technical solution: a water meter housing drilling device, including a CNC drilling machine body 1. A workpiece clamping mechanism is provided at the center of the upper end of the CNC drilling machine body 1. The workpiece clamping mechanism includes a water meter housing mounting base 11 fixedly installed on the upper end of the CNC drilling machine body 1. A water meter housing fixing component 12 is fixedly installed on the upper end of the water meter housing mounting base 11. The water meter housing fixing component 12 is composed of an electric telescopic rod and a support plate. A water meter housing is provided between the water meter housing mounting base 11 and the support plate. The lower end of the support plate is movably abutting against the upper end of the water meter housing. Drilling mechanisms are provided on both sides of the workpiece clamping mechanism. The drilling mechanism includes a sliding limit mounting bracket 2. The machine tool includes a synchronous multi-hole drilling unit and an internal tube rounding milling unit. A sliding limit mounting bracket 2 is slidably mounted on the upper side of the CNC drilling machine body 1. A motor 21 is fixedly mounted on the upper end of the sliding limit mounting bracket 2. A pulley assembly 22 is fixedly connected to the output shaft of the motor 21. The pulley assembly 22 consists of a driving pulley and a driven pulley. The outer surfaces of the driving pulley and the driven pulley are rotatably connected via a belt. A protective cover 23 is provided on the outer side of the pulley assembly 22. The protective cover 23 is fixedly connected to one side surface of the sliding limit mounting bracket 2 by bolts. The internal tube rounding milling unit includes a base part 3, which is fixedly mounted on the inner side of the sliding limit mounting bracket 2. Heat dissipation fins 31 are evenly distributed on the inner ring sidewall of the base part 3. The end of the base part 3 away from the workpiece clamping mechanism is connected to the pulley assembly 22. The synchronous multi-hole drilling unit includes an end cover part 4 located on the base part 3 near the workpiece clamping mechanism. The end cover part 4 is fixedly connected to one end of the base part 3 by bolts. A C-shaped retaining ring 40 is fixedly installed on the inner ring surface of the end cover part 4. The drilling component 42 consists of a drive motor and a drill bit. The inner ring surface of the C-shaped retaining ring 40 is fixedly connected to the outer surface of the drive motor, and the outer surface of the drill bit is rotatably connected to the inner wall of the end cover part 4. The drilling component 42 is provided on the end cover part 4, and a threaded sealing plate 41 is threadedly connected to the center of the end cover part 4. A central rod 32 is provided through the center of the threaded sealing plate 41. A hollow cavity 320 is opened in the center of the central rod 32. The two ends of the central rod 32 are respectively threaded to a tapered end body 1 33 and a tapered end body 2 34. The tapered end body 1 33 and the tapered end body 2 34 are mirror images of each other about the central axis of the base part 3. A connecting rib plate 35 is fixedly connected between the tapered end body 1 33 and the tapered end body 2 34. The inner side of the threaded sealing plate 41 is rotatably connected to the outer surface of the central rod 32 through a bearing. An in-tube rounded corner drilling and milling cutter 43 is provided on the inner side of the central rod 32. The in-tube rounded corner drilling and milling cutter 43 is integrally formed by the cutter shank part 431 and the cutter body part 432.

[0034] In this embodiment, the upper end of the CNC drilling machine body 1 is provided with slide rails, which are distributed on both sides of the water meter housing mounting base 11. A slide block is slidably installed on the upper side of the slide rail. The slide block moves horizontally through a telescopic system, thereby driving the drilling mechanism to adapt to the drilling requirements of the specific workpiece. At the same time, the drilling component 42 installed on the end cover 4 is driven as a whole, and multiple sets of drill bits rotate to perform synchronous drilling operations on one side of the water meter housing flange. When drilling the flange holes at both ends of the water meter housing, the two sets of sliding limit mounting brackets 2 are controlled to move towards the side closer to the water meter housing mounting base 11. Then, the control motor 21 is turned on, its output shaft rotates and drives the drive pulley to rotate. Under the connection of the belt, the central rod 32 rotates with the driven pulley. At this time, the pipe rounding drill and milling cutter 43 connected to one end of the central rod 32 rotates synchronously with the central rod 32, so that the pipe rounding drill and milling cutter 43, which is composed of the cutter body part 432 and the cutter bar part 431, serves as the rounding drill and milling cutter for the inner tube of the water meter housing. This enables the simultaneous drilling of multiple flange holes in the water meter housing, while also satisfying the rounding drill and milling of the inner tube of the water meter housing flange, thus realizing the integrated drilling and machining of the water meter housing.

[0035] Example 2, see attached document Figure 1-13 Based on Embodiment 1, in order to achieve precise oil supply between components and reduce deformation and vibration of the central rod 32 during high-speed rotation: a filling plug 321 is movably installed at the end of the central rod 32 near the pulley assembly 22; a retention groove 3201 is provided at the end of the hollow cavity 320 near the filling plug 321; a first reserved hole is evenly provided on the inner wall of the retention groove 3201; an inner convex slope 322 is fixedly installed on the inner wall of the end of the hollow cavity 320 away from the filling plug 321; the side of the inner convex slope 322 near the threaded sealing plate 41 is set as an adsorption groove 3202; a second reserved hole is evenly provided on the inner wall of the adsorption groove 3202; and a tapered end body 33 and a tapered end body 320 are also provided. The inner wall of the second end body 34 is provided with a liquid guiding groove 330 and a liquid guiding groove 340 respectively. The input end of the liquid guiding groove 330 corresponds to the reserved hole 1, and the input end of the liquid guiding groove 340 corresponds to the reserved hole 2. A reinforcing ring 331 is fixedly installed on the outer ring surface of the liquid guiding groove 330. A bearing 332 is rotatably connected to the outer surface of the reinforcing ring 331. The bearing 332 is fixedly installed on the inner side wall of the base part 3. A hole or groove adapted to the output end of the liquid guiding groove 330 is provided on the inner wall of the reinforcing ring 331. An annular brush 341 is fixedly installed on the outer ring surface of the liquid guiding groove 340. The outer surface of the annular brush 341 is movably connected to the outer surface of the drilling part 42.

[0036] In this embodiment, before or after drilling the water meter casing, lubricating oil is added to the inner cavity of the hollow cavity 320 by the central rod 32 approaching the filling plug 321. Then, the filling plug 321 is used to block the oil filling port of the central rod 32. During the high-speed rotation of the central rod 32, lubricating oil is replenished along the path within the hollow cavity 320. Initially, some lubricating oil remains in the retention groove 3201, as shown in the attached diagram. Figure 4 As shown, the inlet port of the liquid guiding groove 330 of the conical end body 33 corresponds one-to-one with the reserved hole in the retention groove 3201. Under the action of centrifugal force, the lubricating oil reaches the position of the inner convex slope 322 along the liquid guiding groove 330, realizing precise oil supply at this position; and part of the lubricating oil reaches the position of the adsorption groove 3202 under the action of high-speed centrifugation, as shown in the attached figure. Figure 5 As shown, some of the lubricating oil flows into the position of the annular brush 341 through the reserved hole 2 corresponding to the liquid guide groove 340. When the conical end body 34 rotates, it can assist in oiling the surface of the drill bit, thereby improving the efficiency of multi-hole drilling of the flange and enabling auxiliary cooling of the drill bit during drilling, thus extending its service life.

[0037] It is worth noting that the tapered end body 33 and tapered end body 34 are all threadedly connected to the central rod 32. This ensures that each liquid guide groove is matched with the reserved hole, while facilitating assembly, disassembly and maintenance, and making operation convenient. Furthermore, the mirror distribution of tapered end body 33 and tapered end body 34 at both ends of the central rod 32 can also ensure the balance of the central rod 32 during high-speed rotation, enhance the torsional and bending resistance of the central rod 32, and further improve the drilling efficiency of the water meter housing.

[0038] Example 3, refer to Appendix Figure 1-13Based on Embodiment 2, while satisfying the rounded corner drilling and milling of the inner pipe of the water meter housing flange, the auxiliary extrusion of the oil-wiping cotton block 436 is achieved, simultaneously realizing the lubrication effect of the drilled part 42: one end of the tool bar 431 is threadedly connected to a threaded plate 435, which is fixedly installed on the inner side of the adsorption tank 3202; a horizontal sliding groove 4310 is opened in the center of the tool bar 431, and a cross groove 4320 is opened on the inner wall of the tool body 432. The horizontal sliding groove 4310 and the cross groove 4320 are interconnected to form a receiving groove, and an extrusion component is slidably installed on the inner side of the receiving groove; the extrusion component consists of a push rod 433 and a cross connecting claw 4331. The push rod 433 and the cross connecting claw 4331 are integrally formed. The outer surface of the end of the push rod 433 away from the cross connecting claw 4331 is slidably connected to the inner wall of the center of the threaded plate 435; an oil-wiping cotton block 436 is attached to the end of the threaded plate 435 away from the tool body 432, and the oil-wiping cotton block 436 is applied to the end of the threaded plate 435 away from the tool body 432. The outer surface of the cotton block 436 is in movable contact with one side of the inner convex slope 322; the outer surface of the push rod 433 is slidably connected to the inner wall of the horizontal slide groove 4310; the cross connecting claw 4331 is slidably installed on the inner side of the cross groove 4320; an abutment ring 4332 is fixedly connected to the outer surface of the end of the cross connecting claw 4331 away from the push rod 433; the abutment ring 4332 is movably connected to the inner pipe opening of the flange of the water meter housing; an expansion groove is opened on the side of the horizontal slide groove 4310 away from the cross groove 4320, the diameter of the expansion groove is larger than the diameter of the horizontal slide groove 4310 and the two are interconnected; a spring 434 is provided on the inner side of the expansion groove, and the spring 434 is slidably sleeved on the outer side of the push rod 433; a fixing abutment ring 4330 is fixedly installed on one side of the outer surface of the push rod 433, one side of the fixing abutment ring 4330 is fixedly connected to one end of the spring 434, and the other end of the screw plate 435 is fixedly connected to the inner wall of the expansion groove;

[0039] In this embodiment, as shown in the appendix Figure 5 , 9As shown in Figures 10 and 11, when drilling is completed at the drilling positions of the drilling part 42 and the water meter housing flange, the motor 21 drives the central rod 32 to rotate. At this time, the rounded corner drilling and milling cutter 43 inside the pipe rotates at high speed. Under the action of high-speed rotation, the cutter body 432 performs rounded corner drilling and milling on the inner pipe of the water meter housing. During the drilling and milling process, as the rounded corner drilling and milling cutter 43 inside the pipe gradually approaches the water meter housing, the water meter housing squeezes the contact ring 4332. At this time, the end of the cross connecting claw 4331 is subjected to the squeezing force, which pushes the push rod 433 to move towards the side closer to the central rod 32. At this time, the push rod 433 applies squeezing force to the inner oil wiping cotton block 436, which is then squeezed by the oil wiping cotton block 43. Saturated lubricating oil is extruded to assist in the process, thus achieving precise oil supply to the annular brush 341. It should be noted that the screw plate 435 is fixedly installed on the inner side of the adsorption tank 3202, and its inner wall is screwed to the tool bar 431. This allows for convenient replacement of the tool bar 431 based on various factors such as the fillet milling slope of the workpiece, the thickness of the water meter housing flange, and the diameter of the inner tube of the water meter housing. When the tool body 432 is withdrawn away from the water meter housing, the contact ring 4332 does not contact the inner wall of the housing. At this time, the push rod 433 and the cross connecting claw 4331 return to their initial positions under the reverse elastic force of the spring 434, making it convenient for the next use.

[0040] It is also worth noting that the oil-wiping cotton block 436 can store some of the lubricating oil, and the inner convex slope 322 can retain the lubricating oil entering the adsorption tank 3202. When the push rod 433 applies pressure, the inner convex slope 322 can also block the oil-wiping cotton block 436, which facilitates the rapid extrusion of the lubricating oil.

[0041] The working principle and usage process of this invention are as follows: In actual use, firstly, the entire device is assembled. Based on the drilling requirements and model of the water meter housing, a suitable drilling component 42 is selected. The end cap 4 and threaded sealing plate 41 are connected to one end of the base 3 using bolts. A suitable in-pipe rounded corner drilling and milling cutter 43 is selected, and one end of the suitable in-pipe rounded corner drilling and milling cutter 43 is inserted from one end of the central rod 32 and screwed onto the threaded plate 435, achieving rapid assembly of the in-pipe rounded corner drilling and milling cutter 43. After assembly, before or after drilling the water meter housing, lubricating oil is added to the hollow cavity 320 by bringing the central rod 32 close to the filling plug 321. Then, the filling plug 321 is used to block the oil filling port of the central rod 32. During the high-speed rotation of the central rod 32, lubricating oil is replenished along the path within the hollow cavity 320. The sliding limit mounting bracket 2 is moved horizontally by the telescopic system, driving the entire drilling mechanism to... The drilling is adjusted according to the specific workpiece drilling requirements. At the same time, the drilling component 42 installed on the end cover 4 is driven as a whole, and multiple sets of drill bits rotate to perform synchronous drilling on one side of the water meter housing flange. Furthermore, when the drilling component 42 and the water meter housing flange are completed, the motor 21 drives the central rod 32 to rotate. At this time, the rounded corner drilling and milling cutter 43 inside the pipe rotates at high speed. Under the action of high speed rotation, the cutter body 432 performs rounded corner drilling and milling on the inner pipe of the water meter housing. During the drilling and milling process, as the rounded corner drilling and milling cutter 43 inside the pipe gradually approaches the water meter housing, the water meter housing squeezes the contact ring 4332. At this time, the end of the cross connecting claw 4331 is subjected to the squeezing force and pushes the push rod 433 to move closer to the central rod 32. At this time, the push rod 433 applies squeezing force to the inner oil wiping cotton block 436, and assists in squeezing out the saturated lubricating oil on the oil wiping cotton block 436. In this way, the lubricating oil is accurately supplied to the annular brush 341.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drilling device for a water meter casing, comprising a CNC drilling machine body (1), wherein a workpiece clamping mechanism is provided at the upper center position of the CNC drilling machine body (1), characterized in that: The workpiece clamping mechanism is provided with drilling mechanisms on both sides. The drilling mechanism includes a sliding limit mounting bracket (2), a synchronous multi-hole drilling unit, and an inner tube rounded corner drilling and milling unit. The sliding limit mounting bracket (2) is slidably mounted on the upper side of the CNC drilling machine body (1). A motor (21) is fixedly mounted on the upper end of the sliding limit mounting bracket (2). A pulley group (22) is fixedly connected to the output shaft of the motor (21). The inner tube rounded corner drilling and milling unit includes a base part (3). The base part (3) is fixedly mounted on the inner side of the sliding limit mounting bracket (2). The end of the base part (3) away from the workpiece clamping mechanism is connected to the pulley group (22). The synchronous multi-hole drilling unit includes an end cover part disposed on the base part (3) near the workpiece clamping mechanism. (4) A drilling part (42) is provided on the end cap (4). A threaded sealing plate (41) is threadedly connected to the center of the end cap (4). A central rod (32) is provided through the center of the base (3) and the threaded sealing plate (41). A hollow cavity (320) is opened in the center of the central rod (32). A tapered end body one (33) and a tapered end body two (34) are threadedly connected to the two ends of the central rod (32). A connecting rib plate (35) is fixedly connected between the tapered end body one (33) and the tapered end body two (34). The inner side of the threaded sealing plate (41) is rotatably connected to the outer surface of the central rod (32) through a bearing. An in-tube rounded corner drilling and milling cutter (43) is provided on the inner side of the central rod (32). A filling plug (321) is movably installed at one end of the central rod (32) near the pulley assembly (22). A retention groove (3201) is opened at one end of the hollow cavity (320) near the filling plug (321). A reserved hole 1 is evenly opened on the inner wall of the retention groove (3201). An inner convex slope (322) is fixedly installed on the inner wall of the hollow cavity (320) away from the filling plug (321). The side of the inner convex slope (322) near the threaded sealing plate (41) is set as an adsorption groove (3202). A reserved hole 2 is evenly opened on the inner wall of the adsorption groove (3202). The first conical end body (33) and the second conical end body (34) are mirror images of each other about the central axis of the base part (3). The inner walls of the first conical end body (33) and the second conical end body (34) are respectively provided with a liquid guiding groove (330) and a liquid guiding groove (340). The input end of the first liquid guiding groove (330) corresponds to the reserved hole one by one, and the input end of the second liquid guiding groove (340) corresponds to the reserved hole two by one.

2. The drilling device for a water meter casing according to claim 1, characterized in that: The end cap (4) is fixedly connected to one end of the base (3) by bolts. A C-shaped retaining ring (40) is fixedly installed on the inner ring surface of the end cap (4). The drilling component (42) consists of a drive motor and a drill bit. The inner ring surface of the C-shaped retaining ring (40) is fixedly connected to the outer surface of the drive motor, and the outer surface of the drill bit is rotatably connected to the inner wall of the end cap (4).

3. The drilling device for a water meter casing according to claim 1, characterized in that: The inner corner drilling and milling cutter (43) is integrally formed from a cutter shank (431) and a cutter body (432). One end of the cutter shank (431) is threadedly connected to a threaded plate (435). The threaded plate (435) is fixedly installed on the inner side of the adsorption tank (3202). An oil wiping cotton block (436) is attached to the end of the threaded plate (435) away from the cutter body (432). The outer surface of the oil wiping cotton block (436) is in movable contact with one side of the inner convex slope (322).

4. The drilling device for a water meter casing according to claim 3, characterized in that: A horizontal groove (4310) is provided at the center of the blade holder (431), and a cross groove (4320) is provided on the inner wall of the blade body (432). The horizontal groove (4310) and the cross groove (4320) are interconnected to form a receiving groove, and an extrusion member is slidably installed on the inner side of the receiving groove.

5. The drilling device for a water meter casing according to claim 4, characterized in that: The extrusion component consists of a push rod (433) and a cross connecting claw (4331). The push rod (433) and the cross connecting claw (4331) are integrally formed. The outer surface of the end of the push rod (433) away from the cross connecting claw (4331) is slidably connected to the inner wall of the center of the screw plate (435).

6. The drilling device for a water meter casing according to claim 5, characterized in that: The outer surface of the push rod (433) is slidably connected to the inner wall of the horizontal slide groove (4310), the cross connecting claw (4331) is slidably installed on the inner side of the cross groove (4320), and an abutment ring (4332) is fixedly connected to the outer surface of the end of the cross connecting claw (4331) away from the push rod (433).

7. A drilling device for a water meter casing according to claim 6, characterized in that: The horizontal slide groove (4310) has an enlarged diameter groove on the side away from the cross groove (4320). The diameter of the enlarged diameter groove is larger than the diameter of the horizontal slide groove (4310) and the two are interconnected. A spring (434) is provided on the inner side of the enlarged diameter groove, and the spring (434) is slidably sleeved on the outer side of the push rod (433).

8. The drilling device for a water meter casing according to claim 7, characterized in that: A fixing ring (4330) is fixedly installed on one side of the outer surface of the push rod (433). One side of the fixing ring (4330) is fixedly connected to one end of the spring (434), and the other end of the screw plate (435) is fixedly connected to the inner wall of the expansion groove.

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