A drilling positioning mechanism of an impeller box

Abstract

This invention provides a drilling and positioning mechanism for an impeller box, belonging to the field of mechanical technology. It solves the problem of ensuring drilling accuracy for impeller boxes. The drilling and positioning mechanism includes a frame with a columnar positioning seat for mounting the impeller box. The frame also has a U-shaped, liftable pressure plate located directly above the positioning seat and having a clearance notch opposite the positioning seat. A positioning post is vertically slidably connected to the pressure plate, with its lower end opposite the clearance notch and its lower surface higher than the lower surface of the pressure plate. A spring is also provided on the pressure plate, elastically acting downwards on the upper end of the positioning post. This drilling and positioning mechanism ensures drilling accuracy for the impeller box.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology and relates to a drilling and positioning mechanism for an impeller box. Background Technology

[0002] The impeller box is a core component ensuring metering accuracy and is typically mass-produced using plastic injection molding. During the actual assembly of a water meter, in addition to the impeller, the impeller box cavity also needs to accommodate moving parts. Simply put, the shaft end of this part needs to be positioned and rotated through holes in the bottom wall of the impeller box. Therefore, after injection molding, the impeller box requires secondary drilling in its bottom wall.

[0003] In the prior art, secondary drilling equipment for the bottom wall of impeller boxes generally adopts the following structure: a positioning base is set on the worktable, and the impeller box is assembled and fixed on the base in an upside-down manner; a motor with a vertically downward drive shaft is set directly above the base, and a drilling bit is installed on the motor drive shaft. The motor is vertically raised and lowered by a lifting cylinder, and the drilling of the bottom wall of the impeller box is completed by the feed of the drill bit.

[0004] However, the aforementioned traditional drilling structure has obvious technical defects in actual processing: during the drilling process, the drill bit applies axial cutting force and circumferential torsional force to the bottom wall of the impeller box at the same time. The impeller box is simply positioned by inverted posture and simply fits against the base. There is no reliable circumferential anti-rotation and axial clamping limit structure, which makes the impeller box very prone to shaking, displacement or circumferential rotation during processing. This leads to problems such as drilling position deviation, hole diameter deviation and insufficient hole coaxiality, which directly affects the assembly accuracy of subsequent components, reduces the stability of water meter measurement and product qualification rate, and makes it difficult to meet the accuracy requirements of mass production. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a drilling positioning mechanism for an impeller box. The technical problem to be solved by this invention is: how to ensure the drilling accuracy of the impeller box.

[0006] The objective of this invention can be achieved through the following technical solution: a drilling and positioning mechanism for an impeller box, comprising a frame, wherein the frame is provided with a columnar positioning seat for fitting the impeller box, characterized in that the frame is further provided with a U-shaped plate capable of being raised and lowered, the pressure plate being located directly above the positioning seat and having a clearance notch facing the positioning seat, a positioning post being slidably connected vertically to the pressure plate, the lower end of the positioning post being opposite to the clearance notch, and the lower end surface of the positioning post being higher than the lower side surface of the pressure plate, and a spring being provided on the pressure plate, the spring elastically acting downward on the upper end of the positioning post.

[0007] In this design, the frame serves as the mounting carrier for the entire mechanism. The positioning seat has a columnar structure, allowing the impeller box to be inverted and fitted, achieving initial radial positioning of the impeller box. The pressure plate adopts a U-shaped plate structure with a clearance notch. In the initial stage of the pressure plate's descent, the inner wall of the clearance notch will preferentially engage with the protruding ribs on the outer wall of the impeller box, pre-correcting and calibrating the circumferential position of the impeller box. This ensures that the impeller box quickly returns to the precise machining angle. After completing the circumferential pre-positioning, the pressure plate gradually descends to achieve axial clamping of the impeller box edge. This step-by-step positioning method, first circumferential correction and then axial clamping, fundamentally avoids drilling offset caused by initial placement misalignment or angular skew of the impeller box, achieving precise control of the drilling position. Meanwhile, the positioning post slides vertically onto the pressure plate, with its lower end face higher than the lower side of the pressure plate. This allows the pressure plate to first complete the circumferential correction and edge clamping of the impeller box. Then, the positioning post, through the elastic force of spring one, flexibly presses against the center of the top of the impeller box, forming a dual limiting structure of outer axial clamping and center flexible positioning. This avoids deformation and damage to the impeller box caused by rigid clamping, and effectively resists the axial and circumferential forces generated during drilling, completely solving the problem of wobbling and displacement of the impeller box during processing. Spring one continuously provides downward elastic preload to the positioning post, enabling it to adapt to impeller boxes of different wall thicknesses and heights, maintaining a stable clamping state and ensuring reliable positioning throughout the drilling process.

[0008] In the aforementioned impeller box drilling positioning mechanism, a mounting block one is fixed on the pressure plate. Mounting block one protrudes from the clearance notch. A through hole is vertically formed along the upper edge of mounting block one, located inside the clearance notch. The positioning post is slidably connected in the through hole. A mounting block two is fixed on mounting block one, forming a gap between them. A spring one is installed within this gap, and the spring one elastically acts between mounting block two and the upper end of the positioning post. Mounting block one and mounting block two are fixed to the pressure plate, providing a dedicated mounting carrier for the positioning post and spring one. The protrusion of mounting block one from the clearance notch avoids interference with the drill bit's movement and provides a stable sliding guide foundation for the positioning post. The through hole is vertically formed on mounting block one, and the positioning post is slidably connected within it. The inner wall of the through hole provides circumferential restraint and vertical guidance for the positioning post, ensuring that the positioning post can only slide vertically without radial wobbling, significantly improving the accuracy of the central pressure. The gap between mounting block one and mounting block two provides dedicated expansion space for spring one, preventing interference between spring one and surrounding structures when it is compressed and deformed. At the same time, it confines spring one to the vertical direction, so that the elastic force of spring one acts vertically on the upper end of the positioning column, ensuring uniform and stable transmission of elastic force, and solving the problems of force offset and unstable top pressure in traditional elastic top pressure structures.

[0009] In the aforementioned impeller box drilling positioning mechanism, both mounting block one and mounting block two are elongated and bent along their length. One end of mounting block one is locked to the pressure plate with screws, and the other end protrudes from the clearance notch. One end of mounting block two is locked to mounting block one with screws, and the other end is flush with the end of mounting block one protruding from the clearance notch, forming the gap. The elongated bent structure of mounting blocks one and two perfectly adapts to the U-shaped plate structure of the pressure plate and the shape layout of the clearance notch, greatly improving space utilization and avoiding movement interference with components such as drill bits and frames. The detachable connection method facilitates individual replacement and maintenance of parts, reducing operating costs. The flush arrangement of the protruding ends of mounting block two and mounting block one ensures that the gap between them is uniform in size and regular in shape, guaranteeing stable extension and contraction of spring one within the gap and maintaining a balanced elastic force, further enhancing the stability of the positioning pin's pressure.

[0010] In the aforementioned impeller box drilling positioning mechanism, a positioning groove 1 is formed on the upper side of the pressure plate, and mounting block 1 is embedded and positioned within the positioning groove 1. A second positioning groove is formed on mounting block 1, and mounting block 2 is embedded and positioned within the positioning groove 2. Positioning groove 1 is located on the upper side of the pressure plate, and mounting block 1 is embedded and positioned within it, enabling rapid assembly and positioning of mounting block 1 and the pressure plate without repeated adjustments to the installation position, thus improving assembly efficiency. Simultaneously, the embedded structure increases the contact area between mounting block 1 and the pressure plate, enhancing connection strength and preventing loosening or displacement of mounting block 1 due to long-term vibration. Positioning groove 2 is formed on mounting block 1, and mounting block 2 is embedded and positioned within it, similarly achieving precise positioning and secure connection of mounting block 2. Through this double-layer embedded positioning structure, the relative positions of mounting block 1, mounting block 2, positioning post, and spring 1 remain stable over the long term, ensuring the consistency of drilling positions from the structural source and adapting to the needs of large-volume continuous processing.

[0011] In the aforementioned impeller box drilling positioning mechanism, an upper locking hole is provided on the lower side of the mounting block two, and a lower locking hole is provided at the upper end of the positioning post. The upper end of the spring one is locked in the upper locking hole, and the lower end is locked in the lower locking hole. The upper locking hole is located on the lower side of the mounting block two, and the lower locking hole is located at the upper end of the positioning post. The upper and lower ends of the spring one are respectively locked in the two locking holes, realizing the radial limiting and axial fixing of the spring one. This prevents the spring one from shifting laterally, twisting, or falling off during compression and expansion, ensuring that the elastic force of the spring one is always transmitted in the vertical direction without any force deviation. The snap-fit ​​fixing structure does not require auxiliary fixing methods such as glue or welding, making assembly simple and disassembly convenient. At the same time, the connection reliability is high, especially suitable for high-speed and high-frequency drilling processing conditions, and it is not prone to failure after long-term use.

[0012] In the aforementioned impeller box drilling and positioning mechanism, both the positioning post and the through hole are polygonal, and the upper edge of the positioning post has a limiting stop along the circumferential direction. The positioning post and the through hole both use polygonal cross-sections for fit; the polygonal angular structure completely restricts the circumferential rotation of the positioning post, ensuring that the center top position remains precise and unchanged, further improving the circumferential anti-rotation effect of the impeller box. The limiting stop at the upper edge of the positioning post, set circumferentially, limits the downward limit position of the positioning post, preventing the positioning post from slipping out of the through hole under the elastic force of spring one, ensuring the safety and stability of the mechanism's operation.

[0013] In the aforementioned impeller box drilling positioning mechanism, the frame is equipped with a support seat arranged parallel to the positioning seat. A vertical groove is formed on the support seat, and a long, narrow vertical plate is slidably connected within the groove. The pressure plate is locked to the upper end of the vertical plate with screws. The support seat and positioning seat are arranged parallel to each other, providing stable guiding support for the lifting and lowering movement of the pressure plate. The vertical groove is formed on the support seat, and the vertical plate is slidably connected within the groove. The inner wall of the groove provides circumferential limiting and vertical guidance for the vertical plate, ensuring that the vertical plate can only rise and fall in a vertical straight line, without swaying, tilting, or circumferential rotation. The pressure plate is locked to the upper end of the vertical plate with screws and rises and falls synchronously with the vertical plate, ensuring precise lifting trajectory of the pressure plate. After descending, it can accurately press against the edge of the impeller box, so that the axial clamping force is evenly distributed on the impeller box, avoiding misalignment of the clamping force that could cause impeller box displacement, and further improving drilling accuracy.

[0014] In the aforementioned impeller box drilling and positioning mechanism, a cylinder with its drive shaft facing upwards is fixed inside the frame. The drive shaft of the cylinder passes through the frame and is fixedly connected to the lower end of the vertical plate. The cylinder, fixed inside the frame with its drive shaft facing upwards and fixedly connected to the lower end of the vertical plate, provides a stable and controllable power source for the lifting and lowering movement of the vertical plate and the pressure plate, achieving automated lifting and lowering control of the pressure plate without manual operation, significantly improving drilling efficiency. The cylinder's driving power is smooth and has low impact force, enabling precise control of the pressure plate's descent speed and clamping force, preventing excessively fast descent or excessive pressure that could cause deformation and damage to the impeller box.

[0015] In the aforementioned impeller box drilling positioning mechanism, a second spring is provided within the slide groove. The second spring is sleeved outside the drive shaft of the cylinder, with its upper end abutting against the free end of the drive shaft and its lower end abutting against the surface of the frame. When the cylinder drives the vertical plate downwards, the second spring deforms under pressure, acting as a buffer and damping mechanism. This absorbs the vibrations generated by the cylinder drive and the vertical plate's lifting and lowering, preventing vibration from being transmitted to the impeller box and causing positioning misalignment, thus improving the stability of the drilling process. After drilling is completed, the cylinder drive shaft retracts, and the second spring, through its own elasticity, assists the vertical plate in quickly returning to its original position, shortening the processing cycle and improving processing efficiency. Simultaneously, the second spring also prevents rigid impact between the vertical plate and the frame, reducing operating noise and extending the service life of the mechanism.

[0016] In the aforementioned impeller box drilling positioning mechanism, the bearing seat is L-shaped, and a reference groove is provided on the lower side wall of the positioning seat. The lower end of the bearing seat extends into the reference groove and abuts against its groove wall. The bearing seat adopts an L-shaped structure, which has high structural strength and good stability, while occupying little space and adapting to the narrow installation space of the workbench. The reference groove on the lower side wall of the positioning seat provides a dedicated positioning reference for the bearing seat. The lower end of the bearing seat extends into the reference groove and abuts against its groove wall, realizing precise assembly and positioning of the bearing seat and the positioning seat. This ensures that the relative position of the bearing seat and the positioning seat is permanently fixed, and that the pressure plate and the positioning seat maintain a very high coaxiality. From the structural root, this ensures that the drilling center coincides with the impeller box center, completely solving the technical problems of hole eccentricity and poor coaxiality.

[0017] Compared with existing technologies, the drilling positioning mechanism of this impeller box has the following advantages:

[0018] The three-stage positioning structure, consisting of circumferential pre-correction, axial clamping, and central flexible top pressing, combined with the alignment of the clearance notch and the impeller box rib, completely solves the problems of misalignment, shaking, displacement, and rotation during impeller box drilling, and significantly improves the accuracy of drilling position, diameter, and coaxiality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the drilling and positioning mechanism of this impeller box.

[0020] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0021] Figure 3 This is a front view of the drilling positioning mechanism of this impeller box.

[0022] Figure 4 yes Figure 3 A sectional view taken along the AA direction and a magnified view of a portion thereof.

[0023] Figure 5 This is an exploded view of the drilling and positioning mechanism of this impeller box.

[0024] Figure 6 This is a structural diagram of the positioning column.

[0025] Figure 7 This is a schematic diagram of the positioning seat.

[0026] In the picture,

[0027] 1. Frame; 11. Spring 2;

[0028] 2. Positioning seat; 21. Reference slot;

[0029] 3. Pressure plate; 31. Leaving notch; 32. Positioning groove one;

[0030] 4. Positioning pin; 41. Limiting stop; 42. Lower locking hole;

[0031] 5. Spring 1;

[0032] 6. Mounting block one; 61. Perforation; 62. Positioning groove two;

[0033] 7. Mounting block two; 71. Gap; 72. Upper locking hole;

[0034] 8. Support base; 81. Slide groove;

[0035] 9. Vertical board;

[0036] 10. Cylinder. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0038] like Figure 1-3 As shown, the drilling and positioning mechanism of this impeller box includes a frame 1, which serves as the installation foundation for the entire mechanism, ensuring its overall stable operation. A columnar positioning seat 2 is fixed on the frame 1. The impeller box is directly fitted onto the outside of the positioning seat 2 in an inverted manner, with the outer wall of the positioning seat 2 fitting against the inner wall of the impeller box, achieving initial radial positioning of the impeller box. An L-shaped bearing seat 8 is also provided on the frame 1, parallel to the positioning seat 2. A reference groove 21 is formed on the lower side wall of the positioning seat 2. The lower end of the bearing seat 8 extends into the reference groove 21 and abuts against the groove wall, achieving precise positioning of the bearing seat 8 and the positioning seat 2, ensuring their relative positions are permanently fixed. A vertical groove 81 is formed on the bearing seat 8, with a long strip-shaped vertical plate 9 slidably connected within the groove 81. The vertical plate 9 can smoothly rise and fall along the groove 81 without swaying or tilting.

[0039] Combination Figure 4A cylinder 10 with its drive shaft facing upwards is fixed inside the frame 1. The drive shaft of the cylinder 10 passes through a through-shaft hole on the frame 1 and is fixedly connected to the lower end of the vertical plate 9, providing power for the lifting and lowering of the vertical plate 9. A second spring 11 is also fitted inside the slide groove 81. The upper end of the second spring 11 abuts against the drive shaft of the cylinder 10, and the lower end abuts against the surface of the frame 1, playing the role of buffering vibration and assisting in resetting. A U-shaped plate-shaped pressure plate 3 is locked to the upper end of the vertical plate 9 by screws. The pressure plate 3 is located directly above the positioning seat 2 and has a clearance notch 31 facing the positioning seat 2, providing clearance space for the drilling bit. When the pressure plate descends, the inner wall of the clearance notch 31 first cooperates with the protruding rib of the outer wall of the impeller box to complete the circumferential position correction, and then performs axial pressing.

[0040] Combination Figure 5-7 The pressure plate 3 has a positioning groove 32 on its upper side, and a mounting block 6 is embedded in the positioning groove 32. The mounting block 6 has a positioning groove 62, and a mounting block 7 is embedded in the positioning groove 62. Both mounting blocks 6 and 7 are bent strips, forming a gap 71 between them. The mounting block 6 has a vertical through hole 61, and a polygonal positioning post 4 is slidably connected in the through hole 61. The upper end of the positioning post 4 has a limiting stop 41 to prevent slippage. The lower side of the mounting block 7 has an upper locking hole 72, and the upper end of the positioning post 4 has a lower locking hole 42. The upper and lower ends of the spring 5 in the gap 71 are respectively locked in the two locking holes, continuously providing a downward elastic pressing force to the positioning post 4.

[0041] During processing, the operator first places the impeller box upside down on the positioning seat 2 to complete the initial radial positioning. Then, the cylinder 10 is activated, and the drive shaft pushes the vertical plate 9 to slide down along the slide groove 81, causing the pressure plate 3 to descend synchronously. During the descent of the pressure plate 3, the inner wall of the clearance notch 31 first engages with the protruding ribs on the outer wall of the impeller box to correct the circumferential position of the impeller box and ensure accurate angles. Afterward, the pressure plate 3 axially presses the edge of the impeller box, and the spring pushes the positioning column 4 to slide down, providing flexible pressure to the top center of the impeller box, forming a three-stage positioning. At this time, the drill bit passes through the clearance notch 31 to drill a hole in the bottom wall of the impeller box. Throughout the process, the impeller box is without deviation, shaking, displacement, or rotation, and the drilling accuracy is extremely high.

[0042] After processing is completed, the cylinder 10 drives the shaft to retract, the spring 2 11 assists the vertical plate 9 to quickly return to its original position, the pressure plate 3 and the positioning column 4 are lifted synchronously, and the operator can then remove the processed impeller box to complete one processing cycle.

[0043] During use, this mechanism can be adapted to impeller boxes of different sizes by replacing positioning seats 2 of different specifications. Components such as mounting block 1 6, mounting block 2 7, and positioning column 4 can be disassembled and replaced individually, resulting in low maintenance costs. The cooperation between the polygonal positioning column 4 and the through hole 61 completely eliminates circumferential rotation, and the cooperation between the reference groove 21 and the outer wall of the bearing seat 8 ensures accurate positioning between the bearing seat 8 and the positioning seat 2.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications, additions, or similar substitutions to the described specific embodiments without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0045] Although this document frequently uses terms such as frame 1, positioning seat 2, reference groove 21, pressure plate 3, clearance notch 31, positioning groove one 32, positioning post 4, limit stop 41, lower locking hole 42, spring one 5, mounting block one 6, through hole 61, positioning groove two 62, mounting block two 7, gap 71, upper locking hole 72, bearing seat 8, slide 81, vertical plate 9, cylinder 10, and spring two 11, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of explaining and describing the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A drilling positioning mechanism of an impeller box, comprising a frame (1) provided with a positioning seat (2) in a columnar shape and for sleeving an impeller box, characterized in that, The frame (1) is also provided with a U-shaped pressure plate (3) that can be raised and lowered. The pressure plate (3) is located directly above the positioning seat (2) and has a clearance notch (31) that is directly opposite to the positioning seat (2). A positioning post (4) is slidably connected to the pressure plate (3) along the vertical direction. The lower end of the positioning post (4) is opposite to the clearance notch (31), and the lower end face of the positioning post (4) is higher than the lower side face of the pressure plate (3). The pressure plate (3) is also provided with a spring. (5), the spring one (5) acts elastically downward on the upper end of the positioning post (4), the pressure plate (3) is fixed with the mounting block one (6), the mounting block one (6) protrudes from the clearance notch (31), the mounting block one (6) has a through hole (61) vertically opened on the upper edge of the mounting block one (6) located inside the clearance notch (31), the positioning post (4) is slidably connected in the through hole (61), the mounting block one (6) is fixed with the mounting block two (7), the mounting block one (6) A gap (71) is formed between the mounting block 2 (7) and the mounting block 2 (7). The gap (71) contains the spring 1 (5), and the spring 1 (5) acts elastically between the mounting block 2 (7) and the upper end of the positioning post (4). The mounting block 1 (6) and the mounting block 2 (7) are both long strips and bent along their length. One end of the mounting block 1 (6) is locked to the pressure plate (3) by a screw, and the other end protrudes from the clearance notch (31). The mounting block 2 (7) One end is locked to the mounting block (6) by a screw, and the other end is flush with the end of the mounting block (6) that protrudes from the clearance notch (31) to form the gap (71). The upper side of the pressure plate (3) is provided with a positioning groove (32). The mounting block (6) is embedded and positioned in the positioning groove (32). The mounting block (6) is provided with a positioning groove (62). The mounting block (7) is embedded and positioned in the positioning groove (62).

2. The drilling and positioning mechanism for the impeller box according to claim 1, characterized in that, The mounting block 2 (7) has an upper locking hole (72) on its lower side, and the positioning post (4) has a lower locking hole (42) at its upper end. The upper end of the spring 1 (5) is locked in the upper locking hole (72), and the lower end is locked in the lower locking hole (42).

3. The drilling and positioning mechanism for the impeller box according to claim 1 or 2, characterized in that, Both the positioning post (4) and the perforation (61) are polygonal, and the upper edge of the positioning post (4) has a limiting stop (41) along the circumferential direction.

4. The drilling and positioning mechanism for the impeller box according to claim 3, characterized in that, The frame (1) is provided with a bearing seat (8) arranged in parallel with the positioning seat (2). A sliding groove (81) is provided on the bearing seat (8) along the vertical direction. A long strip-shaped vertical plate (9) is slidably connected in the sliding groove (81). The pressure plate (3) is locked to the upper end of the vertical plate (9) by screws.

5. The drilling and positioning mechanism for the impeller box according to claim 4, characterized in that, A cylinder (10) with its drive shaft facing upward is fixed inside the frame (1). The drive shaft of the cylinder (10) passes through the frame (1) and is fixedly connected to the lower end of the vertical plate (9).

6. The drilling and positioning mechanism for the impeller box according to claim 5, characterized in that, The slide groove (81) is provided with a second spring (11), which is sleeved on the drive shaft of the cylinder (10). The upper end of the second spring (11) abuts against the free end of the drive shaft of the cylinder (10), and the lower end abuts against the surface of the frame (1).

7. The drilling and positioning mechanism for the impeller box according to claim 6, characterized in that, The bearing seat (8) is L-shaped, and a reference groove (21) is provided on the side wall of the lower end of the positioning seat (2). The lower end of the bearing seat (8) extends into the reference groove (21) and abuts against its groove wall.

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