Multi-station automatic hole milling device for water meter shell

Abstract

The invention discloses a water meter shell multi-station automatic hole milling device which comprises a driving device, a rotating device, fixing devices and a milling device, the rotating device is arranged at the front end of the top of the driving device, the driving device can drive the rotating device to rotate, and the fixing devices are arranged in the upper end, the lower end, the left end and the right end of the rotating device. The four fixing devices can slide in the upper end, the lower end, the left end and the right end of the rotating device, the milling device is fixedly arranged on the top face of the left end of the driving device, and the driving device, the rotating device, the fixing devices and the milling device can be matched with one another. According to the multi-station automatic hole milling device for the water meter shell, through the multi-station design, precise power transmission, a flexible fixing device and an efficient automatic system, the production efficiency, the machining precision and the device adaptability are remarkably improved, the milling procedure of the upper end, the lower end, the left end and the right end can be conducted at the same time, and the production efficiency is improved. And the device is suitable for machining water meter shells of various sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-station milling holes, and specifically to a multi-station automatic milling hole device for a water meter housing. Background Technique

[0002] As an important part of a water meter, the processing accuracy and quality of the water meter housing directly affect the performance and service life of the water meter. During the manufacturing process of the water meter housing, the milling hole process is one of the key links, and multiple holes need to be processed on the housing to meet the functional requirements of the water meter. However, there are still many problems in the traditional milling hole processing technology for water meter housings.

[0003] Traditional processing equipment usually adopts a single-station design, and can only process one hole at a time, resulting in a long processing cycle and low production efficiency; since the switching between processes requires manual intervention, the equipment downtime is relatively long, further reducing the production efficiency; the stability of the fixing device is insufficient, and the water meter housing is prone to displacement or vibration during the processing, resulting in hole position deviation and affecting the processing accuracy.

[0004] Traditional equipment usually can only adapt to water meter housings of specific sizes. For housings of different sizes, the fixture needs to be replaced or the equipment needs to be adjusted, which is complex and time-consuming to operate; due to the lack of a flexible fixing device, the equipment is difficult to adapt to water meter housings of various shapes and sizes, restricting its application range; due to the lack of an efficient automation system, the operating efficiency and processing quality of the equipment are difficult to be effectively improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-station automatic milling hole device for a water meter housing to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A multi-station automatic milling hole device for a water meter housing, including a driving device, a rotating device, a fixing device and a milling device. A rotating device is provided at the front end of the top of the driving device, and the driving device can drive the rotating device to rotate. Fixing devices are arranged inside the four ends of the upper, lower, left and right of the rotating device, and the four fixing devices can slide inside the four ends of the upper, lower, left and right of the rotating device. A milling device is fixedly arranged on the top surface of the left end of the driving device. The driving device, the rotating device, the fixing device and the milling device can cooperate with each other to simultaneously perform the milling processes on the four ends of the upper, lower, left and right of the water meter housing.

[0007] Preferably, the driving device includes a first rectangular plate, a rectangular rod, a second rectangular plate, a bearing seat, a worm, a first braking motor, a first gear, a first cylindrical block, and a first rotating shaft. A milling device is fixedly arranged on the left side of the outer wall of the first rectangular plate. The center of the rear end of the top surface of the first rectangular plate is fixedly provided with a rectangular rod. The rear side of the outer wall of the rectangular rod is fixedly provided with a second rectangular plate. Bearing seats are arranged at both the left and right ends of the top surface of the second rectangular plate. Both ends of the worm are sleeved in the bearing seats. The right side of the outer wall of the bearing seat at the right end is fixedly provided with a first braking motor, and the output end of the first braking motor is fixedly connected to the right end of the worm. The worm is meshed with a first gear, and the first gear is located directly above the worm. The center of the front side of the first gear is fixedly provided with a first cylindrical block. The outer wall of the first cylindrical block is sleeved with a first rotating shaft. The rear end of the bottom surface of the first rotating shaft is fixedly connected to the top surface of the rectangular rod.

[0008] Preferably, the first braking motor rotates to drive the worm to rotate through the bearing seat, and thus the worm drives the first cylindrical block to rotate through the first gear.

[0009] Preferably, the rotating device includes a cross-shaped plate, a third rectangular plate, a V-shaped groove, a fourth rectangular plate, a fifth rectangular plate, a first electric telescopic rod, a rectangular block, a second electric telescopic rod, and a sixth rectangular plate. The front end of the first cylindrical block is fixedly provided with a cross-shaped plate. Third rectangular plates are arranged at the upper, lower, left, and right ends of the cross-shaped plate. V-shaped grooves that penetrate through the front and rear are formed on the outer walls of the four third rectangular plates. One end of a fourth rectangular plate is fixedly arranged on one side of the outer wall of each of the four third rectangular plates. The rear sides of the other ends of the four fourth rectangular plates are fixedly provided with fifth rectangular plates. The centers of the inner walls of the four fifth rectangular plates are fixedly provided with first electric telescopic rods. The center of the front side of the outer wall of the cross-shaped plate is fixedly provided with a rectangular block. One end of a second electric telescopic rod is fixedly arranged at the center of each of the upper, lower, left, and right ends of the rectangular block. The other ends of the four second electric telescopic rods are fixedly provided with sixth rectangular plates.

[0010] Preferably, the two inclined grooves of the V-shaped groove are at 45 degrees.

[0011] Preferably, the fixing device includes a round rod, a spring, a trapezoidal block, a first right-angle block, a second right-angle block, a first groove, a second groove, a rack, a long rod, a second rotating shaft, a second cylindrical block, a second gear, and a second braking motor. Two slidable round rods are arranged in the V-shaped groove, and both round rods are arranged in the two inclined grooves of the V-shaped groove. A part of the rear ends of the two round rods extends outside the V-shaped groove towards the rear end. One end of a spring is fixedly arranged on the outer walls of the extended parts of the rear ends of the two round rods. The other ends of the two springs are fixedly connected through the trapezoidal block, and the other ends of the two springs are fixedly arranged on the left and right sides of the outer wall of the trapezoidal block. The top surface of the trapezoidal block is fixedly connected to the bottom surface of the first electric telescopic rod. A first right-angle block is fixedly arranged at the front end of one round rod, and a second right-angle block is fixedly arranged at the front end of the other round rod. A first groove is formed on the front side of the outer wall of the second right-angle block, and a second groove is formed on the left side of the outer wall of the second right-angle block, and the second groove penetrates into the first groove. A rack capable of moving with front and rear limits is arranged at the bottom of the first groove, and the rack extends a part towards the front end of the first groove. A long rod is fixedly arranged on the left side of the rear end of the outer wall of the rack. The long rod is arranged in the second groove and extends a part towards the left end of the second groove. The long rod can move with front and rear limits in the second groove. A second rotating shaft is fixedly arranged on the right side of the inner wall of the first groove. A second cylindrical block is sleeved in the second rotating shaft. A second gear is fixedly arranged at the left end of the second cylindrical block. The second gear meshes with the rack. A second braking motor is fixedly arranged at the right end of the second rotating shaft, and the output end of the second braking motor penetrates through the outer wall of the second right-angle block and is fixedly connected to the rear end of the second cylindrical block.

[0012] Preferably, the first electric telescopic rod moves downward to drive the trapezoidal block to clamp the two middle corners of the water meter housing by the first right-angle block and the second right-angle block.

[0013] Preferably, the first electric telescopic rod pulls the trapezoidal block to drive the two round rods to slide in the V-shaped groove through the two end springs, thereby driving the first right-angle block and the second right-angle block to slide.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the multi-station design, the milling processes at the four ends of up, down, left, and right can be carried out simultaneously, significantly improving the production efficiency. The driving device provides power and supports the stability of other devices. The designs of the rotating device and the fixing device enable the device to flexibly adapt to water meter housings of different sizes.

[0015] 2. The processes at the four ends of up, down, left, and right can be carried out simultaneously, significantly shortening the processing time and improving the production efficiency. Through the cooperation of the rotating device and the driving device, different processes can be quickly switched, reducing the equipment downtime and further enhancing the production efficiency. The V-shaped groove and spring design in the fixing device can adapt to water meter shells of different sizes, ensuring that the device can flexibly meet various processing requirements.

[0016] 3. The length of the second electric telescopic rod can be adjusted according to the size of the water meter shell, enabling the device to be applicable to water meter shells of any size, enhancing the versatility and flexibility of the device. The first right-angle block, second right-angle block, and sixth rectangular plate in the fixing device clamp the water meter shell vertically, and the long rod and third rectangular plate clamp the water meter shell horizontally, ensuring that the water meter shell remains absolutely fixed during the processing and avoiding processing errors caused by vibration or displacement.

[0017] 4. Through the mutual cooperation of the driving device, rotating device, fixing device, and milling device, automated processing can be achieved, reducing manual intervention. The design of the first electric telescopic rod and the second braking motor enables the fixing device to automatically adjust the clamping position, further improving the automation degree of the device. The reasonable layout of the driving device, rotating device, fixing device, and milling device makes the overall structure of the device more compact, facilitating maintenance and operation.

[0018] In summary, the multi-station automatic milling hole device for water meter shells provided by the present invention significantly improves the production efficiency, processing accuracy, and device adaptability through multi-station design, precise power transmission, flexible fixing device, and efficient automation system. It can simultaneously carry out milling processes at the four ends of up, down, left, and right, and is applicable to the processing of water meter shells of various sizes, having a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the driving device of the present invention; Figure 3 It is a schematic structural diagram of the bearing seat of the driving device of the present invention; Figure 4 It is a schematic structural diagram of the first cylindrical block of the driving device of the present invention; Figure 5 It is an exploded structural diagram of the rotating device of the present invention; Figure 6 It is a schematic structural diagram of the fixing device of the present invention; Figure 7 It is a schematic structural diagram of the first groove of the fixing device of the present invention; Figure 8 It is a schematic structural diagram of the second groove of the fixing device of the present invention; Figure 9 Schematic cross-sectional structure diagram of the second right-angle block of the fixing device of the present invention; Figure 10 Schematic structure diagram of the rack of the fixing device of the present invention; Figure 11 Exploded structure diagram of the second rotating shaft assembly of the fixing device of the present invention.

[0020] In the figure: 1. Driving device; 2. Rotating device; 3. Fixing device; 4. Milling device; 11. First rectangular plate; 12. Rectangular rod; 13. Second rectangular plate; 14. Bearing seat; 15. Worm; 16. First braking motor; 17. First gear; 18. First cylindrical block; 19. First rotating shaft; 21. Cross-shaped plate; 22. Third rectangular plate; 23. V-shaped groove; 24. Fourth rectangular plate; 25. Fifth rectangular plate; 26. First electric telescopic rod; 27. Rectangular block; 28. Second electric telescopic rod; 29. Sixth rectangular plate; 31. Round rod; 32. Spring; 33. Trapezoidal block; 34. First right-angle block; 35. Second right-angle block; 36. First groove; 37. Second groove; 38. Rack; 39. Long rod; 310. Second rotating shaft; 311. Second cylindrical block; 312. Second gear; 313. Second braking motor. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-11 , the present invention provides a technical solution for a multi-station automatic milling hole device for a water meter housing: including a driving device 1, a rotating device 2, a fixing device 3, and a milling device 4. The driving device 1 not only provides a power source but also has a certain supporting function, which can support the stability during the operation of other devices. The rotating device 2 is arranged at the front end of the top of the driving device 1, and the driving device 1 can drive the rotating device 2 to rotate. The fixing devices 3 are arranged inside the upper, lower, left, and right ends of the rotating device 2. The design of the rotating device 2 and the fixing device 3 is for multi-stations, and the processes at the upper, lower, left, and right ends are carried out simultaneously, improving a certain production efficiency. Moreover, all four fixing devices 3 can slide inside the upper, lower, left, and right ends of the rotating device 2. The milling device 4 is fixedly arranged on the left end top surface of the driving device 1. The milling device 4 can move up and down and can extend and retract left and right. The driving device 1, the rotating device 2, the fixing device 3, and the milling device 4 can cooperate with each other to simultaneously perform the milling processes on the upper, lower, left, and right ends of the water meter housing.

[0023] As a preferred solution, further, the driving device 1 includes a first rectangular plate 11, a rectangular rod 12, a second rectangular plate 13, a bearing seat 14, a worm 15, a first braking motor 16, a first gear 17, a first cylindrical block 18 and a first rotating shaft 19. A milling device 4 is fixedly arranged on the left side of the outer wall of the first rectangular plate 11. The center of the rear end of the top surface of the first rectangular plate 11 is fixedly provided with a rectangular rod 12. The rear side of the outer wall of the rectangular rod 12 is fixedly provided with a second rectangular plate 13. The function of the second rectangular plate 13 is to provide installation and support for subsequent transmission components. Both the left and right ends of the top surface of the second rectangular plate 13 are provided with bearing seats 14. Both ends of the worm 15 are sleeved in the bearing seats 14. A first braking motor 16 is fixedly arranged on the right side of the outer wall of the right end bearing seat 14. The first braking motor 16 has a certain self-locking ability. When the device is not operating, it can enable the device to perform processes stably, improving the accuracy and stability during the processing. Moreover, the output end of the first braking motor 16 is fixedly connected to the right end of the worm 15. A first gear 17 is meshed with the worm 15, and the first gear 17 is located directly above the worm 15. The center of the front side of the first gear 17 is fixedly provided with a first cylindrical block 18. The outer wall of the first cylindrical block 18 is sleeved with a first rotating shaft 19. The rear end of the bottom surface of the first rotating shaft 19 is fixedly connected to the top surface of the rectangular rod 12. The first braking motor 16 rotates to drive the worm 15 to rotate through the bearing seat 14. Thus, the worm 15 drives the first cylindrical block 18 to rotate through the first gear 17. The first braking motor 16 provides power support for the operation of this device, etc., and the design of the worm 15 and the first gear 17 makes the operation of this device more accurate.

[0024] As a preferred solution, further, the rotating device 2 includes a cross-shaped plate 21, a third rectangular plate 22, a V-shaped groove 23, a fourth rectangular plate 24, a fifth rectangular plate 25, a first electric telescopic rod 26, a rectangular block 27, a second electric telescopic rod 28, and a sixth rectangular plate 29. A cross-shaped plate 21 is fixedly arranged at the front end of the first cylindrical block 18. Third rectangular plates 22 are arranged at the upper, lower, left, and right ends of the cross-shaped plate 21. V-shaped grooves 23 that penetrate through the front and back are formed on the outer walls of the four third rectangular plates 22. The two inclined grooves of the V-shaped groove 23 are both 45 degrees. The 45-degree design fits the two vertical corner structures of the water meter housing. One end of a fourth rectangular plate 24 is fixedly arranged on one side of the outer walls of the four third rectangular plates 22. The rear sides of the other ends of the four fourth rectangular plates 24 are fixedly provided with fifth rectangular plates 25. The centers of the inner walls of the four fifth rectangular plates 25 are fixedly provided with first electric telescopic rods 26; a rectangular block 27 is fixedly arranged at the center of the front side of the outer wall of the cross-shaped plate 21. One end of a second electric telescopic rod 28 is fixedly arranged at the centers of the upper, lower, left, and right ends of the rectangular block 27. The other ends of the four second electric telescopic rods 28 are fixedly provided with sixth rectangular plates 29. The length of the telescopic second electric telescopic rod 28 is the length of the diameter of the side circle of the water meter housing to be processed, so that 29 pushes the two middle corners of the surface water meter housing to overlap with the V-shaped groove 23, thereby performing the next process. This design is applicable to water meter objects of any size, realizing the flexibility and diversification of the device.

[0025] As a preferred solution, further, the fixing device 3 includes a round rod 31, a spring 32, a trapezoidal block 33, a first right-angled block 34, a second right-angled block 35, a first groove 36, a second groove 37, a rack 38, a long rod 39, a second rotating shaft 310, a second cylindrical block 311, a second gear 312 and a second braking motor 313. Two slidable round rods 31 are arranged in the V-shaped groove 23, and both of the two round rods 31 are arranged in the two inclined grooves of the V-shaped groove 23. The V-shaped groove 23 can be divided into two inclined grooves. A part of the two round rods 31 extends outward to the rear end of the V-shaped groove 23. One end of a spring 32 is fixedly arranged on the outer walls of the extended parts at the rear ends of the two round rods 31. The other ends of the two springs 32 are connected and fixed through the trapezoidal block 33, and the other ends of the two springs 32 are fixedly arranged on the left and right sides of the outer wall of the trapezoidal block 33. The two springs 32 can both pull and drive the round rod 31. The top surface of the trapezoidal block 33 is connected and fixed to the bottom surface of the first electric telescopic rod 26; a first right-angled block 34 is fixedly arranged at the front end of one round rod 31, and a second right-angled block 35 is fixedly arranged at the front end of the other round rod 31. The designs of the first right-angled block 34 and the second right-angled block 35 fit the right-angled structures on both sides of the middle of the water meter housing. A first groove 36 is formed on the front side of the outer wall of the second right-angled block 35, and a second groove 37 is formed on the left side of the outer wall of the second right-angled block 35, and the second groove 37 penetrates into the first groove 36. A rack 38 capable of moving with front and rear limits is arranged at the bottom of the first groove 36, and the rack 38 extends a part to the front end of the first groove 36. A long rod 39 is fixedly arranged on the left side at the rear end of the outer wall of the rack 38. The long rod 39 is arranged in the second groove 37, and the long rod 39 extends a part to the left end of the second groove 37. The long rod 39 can move with front and rear limits in the second groove 37; a second rotating shaft 310 is fixedly arranged on the right side of the inner wall of the first groove 36. A second cylindrical block 311 is sleeved in the second rotating shaft 310. A second gear 312 is fixedly arranged at the left end of the second cylindrical block 311. The second gear 312 meshes with the rack 38; a second braking motor 313 is fixedly arranged at the right end of the second rotating shaft 310, and the output end of the second braking motor 313 penetrates through the outer wall of the second right-angled block 35 and is connected and fixed to the rear end of the second cylindrical block 311. The first right-angled block 34, the second right-angled block 35 and the sixth rectangular plate 29 clamp the water meter housing up and down, and the long rod 39 and the third rectangular plate 22 clamp the water meter housing front and rear, so as to fix the water meter housing in all directions. During the processing of the water meter housing, the fixing component of this device has an absolute fixing and stabilizing effect and is applicable to water meter housings of any model.

[0026] As a preferred solution, furthermore, the first electric telescopic rod 26 pulls the trapezoidal block 33 to drive two round rods 31 to slide upward in the V-shaped groove 23 through the springs 32 at both ends, thereby driving the first right-angle block 34 and the second right-angle block 35 to slide upward. The upward movement of the trapezoidal block 33 drives the springs 32 to generate a pulling force, thereby driving the two round rods 31 to slide upward. At the same time, the distance between the round rods 31 will increase, and the springs 32 expand to neutralize and keep all components connected; the second braking motor 313 rotates to drive the second gear 312 through the second rotating shaft 310 to move the rack 38 back and forth, thereby the rack 38 moves the long rod 39 back and forth.

[0027] The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process. The specific work is as follows: all four first electric telescopic rods 26 pull the trapezoidal block 33, so that the first right-angle block 34 and the second right-angle block 35 slide to the top of the V-shaped groove 23. The water meter housing is placed on the surface of the sixth rectangular plate 29 at the right end by the robotic arm. The robotic arm will not leave until the water meter housing is fixed. According to the side circle diameter of the water meter housing, the rising height of the second electric telescopic rod 28 at the right end is the length of the side circle diameter of the water meter housing. Since the two inclined grooves of the V-shaped groove 23 are 45 degrees, and the water meter housing is convex with the middle two corners being 90 degrees, at this time, the 45 degrees of the middle two corners of the water meter housing overlap with the two inclined grooves of the V-shaped groove 23. The first electric telescopic rod 26 moves downward to drive the trapezoidal block 33 to clamp the middle two corners of the water meter housing by the first right-angle block 34 and the second right-angle block 35. Since the rack 38 and the second gear 312 are meshed with each other, the second braking motor 313 rotates clockwise to drive the second gear 312 to move the rack 38 backward, thereby the rack 38 moves the long rod 39 backward to fix the water meter housing. Then the robotic arm leaves the water meter housing. Since the worm 15 and the first gear 17 are meshed with each other, the first braking motor 16 rotates to drive the worm 15 to rotate the first gear 17, thereby the first gear 17 drives the fixed water meter housing through the first cylindrical block 18 to perform the next process. The milling device 4 extends to drill the water inlet and outlet. Similarly, the first braking motor 16 drives the water meter housing that has completed the drilling of the water inlet and outlet to rotate for the next process of drilling the water meter cover. Similarly, the first braking motor 16 drives the water meter housing with all drilling completed to rotate to the bottom. Similarly, the second braking motor 313 rotates counterclockwise to move the rack 38 to move the long rod 39 forward to no longer fix the water meter housing. Similarly, the first electric telescopic rod 26 moves upward to drive the trapezoidal block 33, so that the first right-angle block 34 and the second right-angle block 35 no longer clamp the middle two corners of the water meter housing, thereby outputting the water meter housing with drilling completed. At the same time, other processes are the same as above and operate continuously, greatly improving work efficiency.

[0028] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic multi-station milling hole device for a water meter housing, comprising a driving device (1), a rotating device (2), a fixing device (3) and a milling device (4). A rotating device (2) is arranged at the front end of the top of the driving device (1), and the driving device (1) can drive the rotating device (2) to rotate. Fixing devices (3) are arranged at the upper, lower, left and right ends inside the rotating device (2), and the four fixing devices (3) can slide inside the upper, lower, left and right ends of the rotating device (2). A milling device (4) is fixedly arranged on the left end top surface of the driving device (1). The driving device (1), the rotating device (2), the fixing device (3) and the milling device (4) can cooperate with each other to simultaneously perform milling operations on the upper, lower, left and right ends of the water meter housing.

2. The multi-station automatic milling hole device for a water meter housing according to claim 1, wherein: The driving device (1) includes a first rectangular plate (11), a rectangular rod (12), a second rectangular plate (13), a bearing seat (14), a worm (15), a first braking motor (16), a first gear (17), a first cylindrical block (18) and a first rotating shaft (19); A milling device (4) is fixedly arranged on the left outer wall of the first rectangular plate (11). A rectangular rod (12) is fixedly arranged at the center of the rear end of the top surface of the first rectangular plate (11). A second rectangular plate (13) is fixedly arranged on the rear side outer wall of the rectangular rod (12). Bearing seats (14) are arranged at the left and right ends of the top surface of the second rectangular plate (13). Both ends of the worm (15) are sleeved inside the bearing seats (14). A first braking motor (16) is fixedly arranged on the right outer wall of the right bearing seat (14), and the output end of the first braking motor (16) is fixedly connected to the right end of the worm (15). A first gear (17) is meshed with the worm (15), and the first gear (17) is located directly above the worm (15). A first cylindrical block (18) is fixedly arranged at the center of the front side of the first gear (17). A first rotating shaft (19) is sleeved on the outer wall of the first cylindrical block (18), and the rear end of the bottom surface of the first rotating shaft (19) is fixedly connected to the top surface of the rectangular rod (12).

3. The multi-station automatic milling hole device for a water meter housing according to claim 2, characterized in that: The first braking motor (16) rotates to drive the worm (15) to rotate through the bearing seat (14), and thus the worm (15) drives the first cylindrical block (18) to rotate through the first gear (17).

4. A multi-station automatic milling hole device for a water meter housing according to claim 3, characterized in that: The rotating device (2) includes a cross-shaped plate (21), a third rectangular plate (22), a V-shaped groove (23), a fourth rectangular plate (24), a fifth rectangular plate (25), a first electric telescopic rod (26), a rectangular block (27), a second electric telescopic rod (28) and a sixth rectangular plate (29); A cross-shaped plate (21) is fixedly arranged at the front end of the first cylindrical block (18). Third rectangular plates (22) are arranged at the upper, lower, left and right ends of the cross-shaped plate (21). V-shaped grooves (23) penetrating through the front and back are formed in the outer walls of the four third rectangular plates (22). One end of a fourth rectangular plate (24) is fixedly arranged on one side of the outer wall of each of the four third rectangular plates (22). The rear sides of the other ends of the four fourth rectangular plates (24) are fixedly provided with fifth rectangular plates (25). The centers of the inner walls of the four fifth rectangular plates (25) are fixedly provided with first electric telescopic rods (26). A rectangular block (27) is fixedly arranged at the center of the front side of the outer wall of the cross-shaped plate (21). One end of a second electric telescopic rod (28) is fixedly arranged at the center of each of the upper, lower, left and right ends of the rectangular block (27). The other ends of the four second electric telescopic rods (28) are fixedly provided with sixth rectangular plates (29).

5. The multi-station automatic milling hole device for a water meter housing according to claim 4, characterized in that: The two inclined grooves of the V-shaped groove (23) are at 45 degrees.

6. The multi-station automatic milling hole device for a water meter housing according to claim 5, characterized in that: The fixing device (3) includes a round rod (31), a spring (32), a trapezoidal block (33), a first right-angled block (34), a second right-angled block (35), a first groove (36), a second groove (37), a rack (38), a long rod (39), a second rotating shaft (310), a second cylindrical block (311), a second gear (312) and a second braking motor (313); Two slidable round rods (31) are arranged in the V-shaped groove (23), and the two round rods (31) are both arranged in the two inclined grooves of the V-shaped groove (23). A part of the two round rods (31) extends outward to the rear end of the V-shaped groove (23). One end of a spring (32) is fixedly arranged on the outer walls of the extended parts at the rear ends of the two round rods (31). The other ends of the two springs (32) are connected and fixed through a trapezoidal block (33), and the other ends of the two springs (32) are fixedly arranged on the left and right sides of the outer wall of the trapezoidal block (33). The top surface of the trapezoidal block (33) is fixedly connected to the bottom surface of the first electric telescopic rod (26); a first right-angle block (34) is fixedly arranged at the front end of one round rod (31), and a second right-angle block (35) is fixedly arranged at the front end of the other round rod (31). A first groove (36) is formed in the front side of the outer wall of the second right-angle block (35), and a second groove (37) is formed in the left side of the outer wall of the second right-angle block (35), and the second groove (37) penetrates into the first groove (36). A rack (38) capable of being limited to move back and forth is arranged at the bottom of the first groove (36), and the rack (38) extends a part forward into the first groove (36). A long rod (39) is fixedly arranged on the left side of the rear end of the outer wall of the rack (38). The long rod (39) is arranged in the second groove (37), and the long rod (39) extends a part to the left end of the second groove (37). The long rod (39) can be limited to move back and forth in the second groove (37); a second rotating shaft (310) is fixedly arranged on the right side of the inner wall of the first groove (36). A second cylindrical block (311) is sleeved in the second rotating shaft (310). A second gear (312) is fixedly arranged at the left end of the second cylindrical block (311). The second gear (312) meshes with the rack (38); a second braking motor (313) is fixedly arranged at the right end of the second rotating shaft (310), and the output end of the second braking motor (313) penetrates through the outer wall of the second right-angle block (35) and is fixedly connected to the rear end of the second cylindrical block (311).

7. An automatic multi-station milling hole device for a water meter housing according to claim 6, characterized in that: The first electric telescopic rod (26) moves downward to drive the trapezoidal block (33) to clamp the two middle corners of the water meter housing by the first right-angle block (34) and the second right-angle block (35).

8. An automatic multi-station milling hole device for a water meter housing according to claim 7, characterized in that: The first electric telescopic rod (26) pulls the trapezoidal block (33) to drive the two round rods (31) to slide in the V-shaped groove (23) through the two end springs (32), thereby driving the first right-angle block (34) and the second right-angle block (35) to slide.

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