Water meter shell positioning and punching tool

Abstract

This invention relates to the field of water meter casing processing technology, and discloses a water meter casing positioning and drilling fixture, including a connecting shaft. A mounting plate is fixedly mounted on the top of the connecting shaft. A slidably adjustable rotating circular plate is mounted on the top of the mounting plate. A mounting frame is fixedly mounted on the top of the rotating circular plate, and the mounting frame is open on all four sides. A slidably adjustable mounting bracket is mounted on the inner wall of the mounting frame. A worm gear is rotatably mounted at the center of the mounting bracket. This invention uses a connecting assembly to disengage the second cutter body from the worm wheel. When the worm gear drives the worm wheel to rotate, the worm wheel is in a free-spinning state. After rotating a certain angle, the second cutter body is then reconnected to the worm wheel via the connecting assembly. This ensures that the force applied to the worm gear during meshing is different each time, avoiding accelerated wear of the same part of the worm wheel under prolonged meshing force. This reduces the wear rate of the worm wheel, extends its service life, and also ensures the accuracy of angle adjustment.

Description

Technical Field

[0001] This invention relates to the field of water meter casing processing technology, specifically a water meter casing positioning and drilling tool. Background Technology

[0002] The movement slots in water meter casings are typically enlarged by drilling and boring. These movement slots have relatively large diameters and are interconnected at the bottom to accommodate water inlet and outlet. Near the bottom of the movement slot, there is usually a protruding retaining edge for positioning and limiting during movement installation, ensuring the bottom of the movement can contact water and create flow. When machining the movement slots, drilling is usually performed first, followed by boring to enlarge the diameter. However, setting up the protruding retaining edge is cumbersome, and a single boring operation has low precision. Therefore, designing a positioning and drilling fixture for water meter casings is essential.

[0003] For example, Chinese Patent Publication No. CN117862569B relates to the technical field of water meter casing processing equipment, specifically disclosing a tooling for drilling positioning grooves in water meter casings, including a main structure, a tool adjusting structure, and an adjusting unit. The main structure is fixedly mounted on the adjusting unit, and the tool adjusting structure is movably mounted on the main structure. This invention offers higher processing efficiency and precision. The two boring tools can work together, with one specifically responsible for hole enlargement and drilling, and the other for fine adjustment or other processing steps, allowing for more precise control of the processing and improved processing accuracy. The two boring tools can perform different processing operations to meet different needs, increasing the machine tool's versatility. When the two boring tools are used together, they can better form an annular outer convex wall edge, resulting in a more uniform inner wall and improved processing quality. This allows the outer convex wall edge to be used for force-bearing positioning during casing installation.

[0004] However, during operation, the gear and rack maintain a fixed contact point. When the boring tool cuts the material, a cutting force is generated. This force is produced by the interaction between the tool and the workpiece. During boring, the reaction force is transmitted to the machine tool's transmission system through the tool. These reaction forces act on the gear and rack, causing them to bear additional loads. Due to the presence of the reaction force, the gear and rack are subjected to periodic impacts and vibrations. These impacts and vibrations lead to wear and fatigue of the gear and rack, which may eventually cause their damage. This not only reduces the service life of the gear and rack, but also reduces the overall accuracy of the tooling because the rack and gear cannot fit tightly after wear. Summary of the Invention

[0005] The purpose of this invention is to provide a water meter casing positioning and drilling tool to solve at least one technical problem existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a water meter casing positioning and drilling fixture, comprising a connecting shaft, an mounting plate fixedly mounted on the top of the connecting shaft, a slidably adjustable rotating circular plate mounted on the top of the mounting plate, an mounting frame fixedly mounted on the top of the rotating circular plate, and the mounting frame being open on all four sides, a slidably adjustable mounting bracket mounted on the inner wall of the mounting frame, a worm gear rotatably mounted at the center of the mounting bracket, fixed shafts fixedly mounted on both inner walls of the mounting bracket, worm wheels rotatably mounted on the outer walls of both fixed shafts, and the worm wheels and the worm gear always maintaining engagement, and a second cutting body mounted on the outer wall of the worm wheel;

[0007] A motor is fixedly mounted on the bottom of the mounting bracket, and the output shaft of the motor passes through the bottom of the mounting bracket and is fixedly connected to the worm gear.

[0008] A detachable first blade is mounted on the top of the mounting frame;

[0009] It also includes a connecting component that allows the second cutter body to disengage from or merge with the worm gear.

[0010] Preferably, the connecting assembly includes a rotating buckle that is fixedly connected to the outer walls of both sides of the worm gear, and two insert rods are provided on the side of the second cutter body away from the tip. The rotating buckle has a plurality of slots that allow the insert rods of the second cutter body to extend into.

[0011] The connecting assembly also includes a telescopic component that allows the insert rod of the second blade to extend into or disengage from the slot and remains locked after extension.

[0012] Preferably, the telescopic assembly includes a sleeve rotatably connected to the outer wall of a fixed shaft, a first rotating rod fixedly connected to the outer wall of the sleeve, a second rotating rod rotatably connected to the outer wall of the first rotating rod, a rotating shaft fixed to the side wall of the second cutter body, and the outer wall of the second rotating rod away from the connection point with the first rotating rod rotatably connected to the rotating shaft. A friction wheel is slidably connected to the outer wall of the sleeve via a flat key.

[0013] The telescopic assembly also includes an arc-shaped groove formed on the outer wall of the second rotating rod;

[0014] The telescopic assembly also includes a limiting component that allows the second blade to slide in the horizontal direction.

[0015] Preferably, the limiting component includes a second slider fixedly installed on the outer wall of the rotating shaft, and a triangular plate is fixedly connected to the outer wall of the mounting bracket. The triangular plate has a straight groove that allows the second slider to slide in or out.

[0016] Preferably, both the first rotating rod and the second rotating rod have through holes on their outer walls, and the two through holes coincide after the second rotating rod rotates to coincide with the first rotating rod. The friction wheel has a pin fixedly installed on its outer wall that can extend into or pull out of the two through holes.

[0017] Preferably, the top of the mounting plate has a straight groove, a rotating screw is rotatably installed in the straight groove, and a first slider that can slide in the straight groove is fixedly installed at the bottom of the rotating circular plate. The first slider has a threaded groove through which the rotating screw passes, and the rotating screw is threadedly connected to the threaded groove.

[0018] Preferably, a cylinder is fixedly installed on the top of the rotating circular plate, and the telescopic rod of the cylinder is fixedly connected to the bottom of the mounting frame.

[0019] Preferably, the vertical adjustment angle range of the second blade is 90 degrees.

[0020] Preferably, the length of the second cutter body within the slot is greater than the distance from the second slider to the straight groove.

[0021] Preferably, the rotating buckle is cross-shaped and has four slots.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] I. This invention uses a connecting assembly to disengage the second cutter body from the worm wheel. At this time, when the worm drives the worm wheel to rotate, the worm wheel is in an idle state. After rotating it to a certain angle, the second cutter body is then connected to the worm wheel again through the connecting assembly. This allows the parts of the worm and worm wheel to be subjected to different forces each time they mesh, avoiding accelerated wear of the same part of the worm wheel under prolonged meshing force. This reduces the wear rate of the worm wheel, extends its service life, and also ensures the accuracy of angle adjustment.

[0024] Second, by using the dead-point engagement between the pin shaft and the first and second rotating rods, this invention can significantly reduce the reaction force transmitted from the cutting tool to the machine tool's transmission system, thereby extending the service life of the device. Furthermore, during use, the pin shaft, as the first point of force application, bears a large reaction force. Even if it is damaged, replacing the pin shaft is cheaper and more convenient, saving resource costs. Attached Figure Description

[0025] Figure 1 This is a perspective view of the present invention;

[0026] Figure 2 This is the front view of the present invention;

[0027] Figure 3 This is a right view of the present invention;

[0028] Figure 4 This is an exploded view of the rotating screw and the first slider in this invention;

[0029] Figure 5 This is a sectional view of the main view of the present invention;

[0030] Figure 6 This is a top view of the second blade body after it has disengaged from the rotating buckle in this invention.

[0031] Figure 7 This is a schematic diagram of the second slider being inserted into the straight groove in this invention;

[0032] Figure 8 This is a three-dimensional schematic diagram of the second blade body after it has disengaged from the rotating buckle in this invention.

[0033] In the diagram: 1. Connecting shaft; 2. Mounting plate; 3. Rotating circular plate; 4. Mounting frame; 5. First cutter body; 6. Second cutter body; 7. Rotating screw; 8. Mounting bracket; 9. Worm gear; 10. Worm wheel; 11. First slider; 12. Threaded groove; 13. Fixed shaft; 14. Second rotating rod; 15. First rotating rod; 16. Friction wheel; 17. Pin; 18. Second slider; 19. Triangular plate; 20. Arc groove; 21. Rotary buckle; 22. Slot; 23. Slide groove; 24. Sleeve; 25. Rotating shaft; 26. Cylinder. Detailed Implementation

[0034] 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.

[0035] Please see Figures 1 to 8 The present invention provides a technical solution: a water meter housing positioning and drilling fixture, including a connecting shaft 1, an mounting plate 2 fixedly mounted on the top of the connecting shaft 1, a slidably adjustable rotating circular plate 3 mounted on the top of the mounting plate 2, an mounting frame 4 fixedly mounted on the top of the rotating circular plate 3, and the mounting frame 4 being open on all four sides, a slidably adjustable mounting bracket 8 mounted on the inner wall of the mounting frame 4, a worm gear 9 rotatably mounted at the center of the mounting bracket 8, a fixed shaft 13 fixedly mounted on the inner walls of both sides of the mounting bracket 8, a worm wheel 10 rotatably mounted on the outer wall of both fixed shafts 13, and the worm wheel 10 and the worm gear 9 always being engaged, and a second cutter body 6 mounted on the outer wall of the worm wheel 10;

[0036] A motor is fixedly mounted on the bottom of the mounting bracket 8, and the output shaft of the motor passes through the bottom of the mounting bracket 8 and is fixedly connected to the worm gear 9;

[0037] A detachable first blade body 5 is mounted on the top of the mounting frame 4;

[0038] It also includes a connecting component that allows the second cutter body 6 to disengage from or merge with the worm gear 10.

[0039] When using this device, firstly, a hole-drilling device (such as a drilling machine or electric drill) is used to drill an initial hole at the location where a hole needs to be drilled on the workpiece. Then, the connecting shaft 1 is mounted on the drive shaft of the motor or other drilling device, with the mounting frame 4 facing downwards. The drive device drives the connecting shaft 1 to rotate, which in turn drives the mounting plate 2 and the rotating circular plate 3 to rotate, thereby driving the mounting frame 4 and the mounting bracket 8 to rotate. This causes the first cutting body 5 to rotate around the center of the rotating circular plate 3, and the distance from the center of the rotating circular plate 3 to the projection of the tip of the first cutting body 5 is used as the radius to enlarge the hole, completing the first cutting pass.

[0040] During the boring and enlarging process of the core groove of the water meter casing, as the depth increases, it is impossible to judge the accuracy of the cutting part by using only the first cutting tool 5. Therefore, during the enlarging process, as the depth increases, the second cutting tool 6 gradually comes into contact with the hole. The rotation of the second cutting tool 6 will allow the part processed by the first cutting tool 5 to pass through again for calibration. At the same time, it can also remove the burrs generated after the first pass. When the second cutting tool 6 is not in use, the worm gear 9 can be driven to rotate by the motor at the bottom of the mounting frame 8, which in turn causes the worm wheel 10 to drive the second cutting tool 6 to rotate, so that the second cutting tool 6 can be placed in contact with the mounting frame 4 for storage. The first cutting tool 5 can also be removed from the top of the mounting frame 4 to prevent the cutting tips of the first cutting tool 5 and the second cutting tool 6 from being damaged when not in use.

[0041] However, during operation, the worm 9 and worm wheel 10 maintain a fixed contact point. When the boring tool cuts the material, a cutting force is generated. This force is produced by the interaction between the tool and the workpiece. During the boring process, the reaction force is transmitted to the machine tool's transmission system through the tool. These reaction forces act on the worm 9 and worm wheel 10, causing them to bear additional loads. Due to the presence of the reaction force, the worm 9 and worm wheel 10 are subjected to periodic impacts and vibrations. These impacts and vibrations can cause wear and fatigue of the gears and racks, which may eventually lead to their damage. This will not only reduce the service life of the gears and racks, but also reduce the accuracy of the entire tooling because the rack and gears cannot fit tightly after wear. Therefore, before each angle adjustment, the second cutter body 6 is disengaged from the worm wheel 10 via the connecting assembly. At this time, when the worm 9 drives the worm wheel 10 to rotate, the worm wheel 10 is in an idle state. After rotating it to a certain angle, the second cutter body 6 is then reconnected to the worm wheel 10 via the connecting assembly. This ensures that the parts of the worm 9 and worm wheel 10 mesh and bear force differently each time, avoiding accelerated wear of the same part of the worm wheel 10 under prolonged meshing force. This reduces the wear rate of the worm wheel 10, extends its service life, and also ensures the accuracy of angle adjustment.

[0042] Furthermore, the connecting assembly includes a rotating buckle 21 that is fixedly connected to the outer walls of both sides of the worm gear 10. The second cutter body 6 has two insert rods on the side away from the tip. The rotating buckle 21 has several slots 22 that allow the insert rods of the second cutter body 6 to extend into.

[0043] The connecting assembly also includes a telescopic component that allows the insert of the second blade 6 to extend into or disengage from the slot 22 and remains locked after extension.

[0044] See Figure 1 In use, the two inserts of the second cutter body 6 are pulled out from the slot 22 by the telescopic component. The worm gear 9 is driven to rotate by the motor, which causes the worm wheel 10 to drive the rotating buckle 21 to rotate. After rotating it to a certain angle, the inserts of the second cutter body 6 are inserted into the next slot 22 and locked by the telescopic component, thereby fixing the second cutter body 6 and making it relatively stationary with the worm wheel 10 during operation, which increases its stability during operation.

[0045] Furthermore, the telescopic assembly includes a sleeve 24 rotatably connected to the outer wall of the fixed shaft 13, a first rotating rod 15 fixedly connected to the outer wall of the sleeve 24, a second rotating rod 14 rotatably connected to the outer wall of the first rotating rod 15, a rotating shaft 25 fixedly connected to the side wall of the second blade body 6, and the outer wall of the second rotating rod 14 away from the connection point with the first rotating rod 15 rotatably connected to the rotating shaft 25. A friction wheel 16 is slidably connected to the outer wall of the sleeve 24 via a flat key.

[0046] The telescopic assembly also includes an arcuate groove 20 formed on the outer wall of the second rotating rod 14;

[0047] The telescopic assembly also includes a limiting component that allows the second blade 6 to slide in the horizontal direction.

[0048] Furthermore, the rotating buckle 21 is cross-shaped and has four slots 22.

[0049] See Figure 8When it is necessary to change the force points of the worm 9 and worm wheel 10, the friction wheel 16 is manually rotated. The friction wheel 16 drives the sleeve 24 to rotate, thereby causing the first rotating rod 15 to rotate, which in turn drives the second rotating rod 14 to rotate. The rotation of the second rotating rod 14 will cause the second cutter body 6 to move horizontally away from the friction wheel 16 until the second cutter body 6 is completely disengaged from the slot 22. After the second cutter body 6 is completely disengaged from the slot 22, under the action of the limiting component, the second cutter body 6 will continue to move horizontally away from the friction wheel 16 until the second rotating rod 14 rotates back to a horizontal state. At this time, the rotation of the worm 9 drives the worm wheel 10 and the rotating buckle 21 to rotate, and the switching contact is completed. The purpose of this is to, after the switching is completed, reverse the friction wheel 16, causing the first rotating rod 15 to drive the second rotating rod 14 to rotate in the opposite direction. During the rotation of the second rotating rod 14, the limiting component causes the second cutter body 6 to enter the next slot 22 in a horizontal state. When the second rotating rod 14 rotates to the initial state, the arc groove 20 will fit with the fixed shaft 13. When the second rotating rod 14 is in the initial position, the center of the second rotating rod 14 and the center of the first rotating rod 15 are on the same horizontal line, forming a dead point, so that the second cutter body 6 cannot be displaced in the horizontal direction, preventing the second cutter body 6 from disengaging from the slot 22 during operation and causing danger, and enabling the second cutter body 6 to perform hole enlargement more accurately.

[0050] It is worth mentioning that the structure of the rotating buckle 21 can be in other shapes such as triangle, and the slots 22 can be opened according to the usage requirements. In this case, a cross shape is adopted, and four slots 22 are opened.

[0051] Furthermore, the limiting assembly includes a second slider 18 fixedly installed on the outer wall of the rotating shaft 25, and a triangular plate 19 fixedly connected to the outer wall of the mounting bracket 8. The triangular plate 19 has a groove 23 that allows the second slider 18 to slide into or out.

[0052] See Figure 7 as well as Figure 8When the second rotating rod 14 drives the second cutter body 6 to move away from the friction wheel 16, it will first move horizontally under the action of the slot 22. After the insertion rod at the end of the second cutter body 6 is completely disengaged from the slot 22, the second slider 18 will enter the slide groove 23, so that the second cutter body 6 continues to move horizontally until the second rotating rod 14 rotates to be parallel to the first rotating rod 15 again. After the connection between the worm 9 and the worm wheel 10 is switched, the second rotating rod 14 is rotated in the opposite direction by rotating the friction wheel 16 in the opposite direction, and the second slider 18 enters the slide groove 23. Block 18 will gradually bring the second cutter body 6 closer to the rotating buckle 21 and keep it moving horizontally within the slide groove 23. When the insertion rod at the end of the second cutter body 6 enters the slot 22, the second slider 18 disengages from the slide groove 23, thus achieving the purpose of keeping the second cutter body 6 moving horizontally at all times. This prevents the insertion rod at the end of the second cutter body 6 from rotating after disengaging from the slide groove 23, ensuring that the insertion rod at the end of the second cutter body 6 can stably enter the slide groove 23 after the worm gear 9 and worm wheel 10 have switched, thereby improving the feasibility of the entire device.

[0053] Furthermore, both the outer walls of the first rotating rod 15 and the second rotating rod 14 are provided with through holes, and the two through holes are aligned after the second rotating rod 14 rotates to coincide with the first rotating rod 15. A pin 17 that can extend into or be pulled out of the two through holes is fixedly installed on the outer wall of the friction wheel 16.

[0054] See Figure 8 Both the second rotating rod 14 and the first rotating rod 15 have through holes on their outer walls, and these two through holes can remain aligned even after the second rotating rod 14 and the first rotating rod 15 overlap. When the two through holes overlap, by moving the friction wheel 16, the pin 17 is driven into the two through holes, thus preventing the first rotating rod 15 and the second rotating rod 14 from shifting and keeping them relatively stationary. When it is necessary to switch the contact point between the worm 9 and the worm wheel 10, by moving the friction wheel 16, the first rotating rod 15 is disengaged from the two through holes, and then the friction wheel 16 is rotated to disengage the second cutter body 6 from the slot 22, thus completing the above switching process. Although After the second rotating rod 14 and the first rotating rod 15 coincide, a dead point can be formed, which can prevent the second tool body 6 from disengaging from the slot 22 during operation to a certain extent. However, during the continuous hole expansion process, the reaction force will be transmitted to the transmission system of the machine tool through the tool, which will cause a certain degree of damage to the second rotating rod 14 and the first rotating rod 15. With the cooperation of the pin 17 and the dead point, this damage can be greatly reduced, and the service life of the device can be improved. In addition, during use, the pin 17, as the first force-bearing point, bears a large reaction force. Even if it is damaged, the replacement of the pin 17 is cheaper and more convenient, saving resource costs.

[0055] Furthermore, the top of the mounting plate 2 is provided with a straight groove, and a rotating screw 7 is rotatably installed in the straight groove. The bottom of the rotating circular plate 3 is fixedly installed with a first slider 11 that can slide in the straight groove. The first slider 11 is provided with a threaded groove 12 through which the rotating screw 7 passes, and the rotating screw 7 is threadedly connected to the threaded groove 12.

[0056] See Figure 4 By rotating the rotating screw 7, the rotating disc 3 can be adjusted to move horizontally in the opposite direction under the cooperation of the threaded groove 12 and the rotating screw 7, thereby driving the mounting frame 4 and the first cutter body 5 to move. When the connecting shaft 1 rotates through the driving structure, the radius of the first cutter body 5 can be increased by taking the center of the connecting shaft 1 as the center and the distance from the center of the connecting shaft 1 to the projection of the tip of the first cutter body 5 as the radius, thereby achieving different degrees of hole enlargement.

[0057] Furthermore, a cylinder 26 is fixedly installed on the top of the rotating circular plate 3, and the telescopic rod of the cylinder 26 is fixedly connected to the bottom of the mounting bracket 8.

[0058] When the second cutter body 6 is aligned and parallel to the first cutter body 5, the two distances are adjusted by the cylinder 26 so that the two distances are the same as the width of the protruding wall edge at the bottom of the inner core groove of the water meter housing. Then, by rotating the screw 7 and driving the rotating disc 3 to move, the protruding wall edge can be directly processed with the help of the first cutter body 5 and the second cutter body 6, without the need for repeated adjustment and movement of the cutter.

[0059] Furthermore, the second blade 6 can be adjusted up and down within a range of 90 degrees.

[0060] See Figure 2 The second cutter body 6 can rotate upward or downward by 45 degrees. Since the cross-shaped rotating buckle 21 used in this case has four slots 22, after switching the contact point between the worm 9 and the worm wheel 10, rotating it upward or downward by more than 45 degrees will cause the worm 9 and the worm wheel 10 to coincide with the previous contact point, so that the vertical adjustment angle range of the second cutter body 6 is 90 degrees. This can prevent them from coinciding again and causing excessive fatigue at the coinciding point of the worm 9 and the worm wheel 10, resulting in micro-cracks. This not only improves the accuracy of use, but also increases the service life of the device.

[0061] Furthermore, the length of the second cutter body 6 within the slot 22 is greater than the distance from the second slider 18 to the slot 23.

[0062] See Figure 7 and Figure 8 The length of the second cutter body 6 within the slot 22 is greater than the distance from the second slider 18 to the slot 23, which ensures that the second cutter body 6 can always maintain horizontal movement during the movement.

[0063] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0064] 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 water meter case positioning and punching tool comprising a connecting shaft, characterized in that: A mounting plate is fixedly installed on the top of the connecting shaft. A slidably adjustable rotating circular plate is installed on the top of the mounting plate. A mounting frame is fixedly installed on the top of the rotating circular plate. The mounting frame is open on all four sides. A slidably adjustable mounting bracket is installed on the inner wall of the mounting frame. A worm gear is rotatably installed at the center of the mounting bracket. Fixed shafts are fixedly installed on the inner walls of both sides of the mounting bracket. Worm wheels are rotatably installed on the outer walls of both fixed shafts. The worm wheels and the worm gear are always meshed. A second cutter body is installed on the outer wall of the worm wheel. A motor is fixedly mounted at the bottom of the mounting bracket, and the output shaft of the motor passes through the bottom of the mounting bracket and is fixedly connected to the worm gear. A removable first blade is mounted on the top of the mounting frame; It also includes a connecting component that allows the second cutter body to disengage from or merge with the worm gear; The connecting assembly includes rotating buckles that are fixedly connected to the outer walls of both sides of the worm gear. The second cutter body has two insert rods on the side away from the tip. The rotating buckles have several slots that allow the insert rods of the second cutter body to extend into. The connecting assembly also includes a telescopic component that allows the insert rod of the second blade to extend into or disengage from the slot and remains locked after extension; The telescopic assembly includes a sleeve rotatably connected to the outer wall of a fixed shaft, a first rotating rod fixedly connected to the outer wall of the sleeve, a second rotating rod rotatably connected to the outer wall of the first rotating rod, a rotating shaft fixed to the side wall of the second cutter body, and the outer wall of the second rotating rod away from the connection point with the first rotating rod rotatably connected to the rotating shaft. A friction wheel is slidably connected to the outer wall of the sleeve via a flat key. The telescopic assembly also includes an arcuate groove formed on the outer wall of the second rotating rod; The telescopic assembly also includes a limiting component that allows the second blade to slide in the horizontal direction; The limiting assembly includes a second slider fixedly installed on the outer wall of the rotating shaft, and a triangular plate fixedly connected to the outer wall of the mounting bracket. The triangular plate has a straight groove that allows the second slider to slide in or out. Both the first and second rotating rods have through holes on their outer walls. When the second rotating rod rotates to coincide with the first rotating rod, the two through holes coincide. A pin that can extend into or pull out of the two through holes is fixedly installed on the outer wall of the friction wheel.

2. The water meter case positioning and punching tooling of claim 1, wherein: The top of the mounting plate has a straight groove, in which a rotating screw is rotatably mounted. The bottom of the rotating circular plate has a first slider that can slide in the straight groove. The first slider has a threaded groove through which the rotating screw passes, and the rotating screw is threadedly connected to the threaded groove.

3. The water meter case positioning and punching tooling of claim 2, wherein: A cylinder is fixedly installed on the top of the rotating circular plate, and the extension rod of the cylinder is fixedly connected to the bottom of the mounting bracket.

4. The water meter case positioning and punching tooling of claim 3, wherein: The second blade can be adjusted up and down within a 90-degree range.

5. The water meter case positioning and punching tooling of claim 4, wherein: The length of the second cutter body within the slot is greater than the distance from the second slider to the straight groove.

6. The water meter case positioning and punching tooling of claim 5, wherein: The rotating buckle is cross-shaped and has four slots.

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