Tooth hole coaxial positioning device based on press machine eccentric gear

Abstract

The invention relates to the technical field of machine manufacturing, and discloses a press machine eccentric gear-based tooth hole coaxial positioning device, which comprises a workbench and a coaxial positioning mechanism, a rotating table used for rotationally supporting the eccentric gear body and a gear motor used for rotationally driving the rotating table are installed on the top of the workbench. The coaxial positioning mechanism comprises an axial positioning unit and an outer circle positioning unit. The axial positioning unit comprises a positioning shaft barrel used for being inserted into an eccentric hole or a center hole of the eccentric gear body. An axial positioning unit and an outer circle positioning unit are adopted for cooperative operation, the axial positioning unit is inserted into an eccentric hole or a center hole of an eccentric gear body through a positioning shaft barrel to achieve preliminary positioning, and axial and radial displacement of the gear is effectively limited in cooperation with elastic pressing of an end face pressing piece; through fine adjustment and calibration of the air cylinder, the coaxiality of the gear holes is greatly improved through a dual-positioning mechanism, precision errors caused by gear deviation in the machining process are avoided, and the machining quality of the gear holes is guaranteed.

Description

Coaxial positioning device for tooth holes based on eccentric gears of presses Technical Field

[0001] This invention belongs to the field of mechanical manufacturing technology, specifically relating to a coaxial positioning device for tooth holes based on an eccentric gear of a press. Background Technology

[0002] In the field of mechanical manufacturing, presses, as core processing equipment, are widely used in stamping, stretching, and forming processes in industries such as automobiles, home appliances, and aerospace. Eccentric gears, as key components of the press's main transmission system, directly determine the press's motion accuracy, operational stability, and the quality of stamped products through their machining precision. Among these, the coaxiality of the teeth and bores is one of the core technical indicators in eccentric gear machining. Deviations in the coaxiality of the teeth and bores can lead to uneven force distribution, motion jamming, and increased noise during press transmission. In severe cases, it can also exacerbate die wear, shorten equipment lifespan, and even affect the dimensional accuracy and forming quality of stamped parts.

[0003] Currently, coaxial positioning of gear teeth faces numerous technical challenges in the machining of eccentric gears. On one hand, the unique structure of eccentric gears, with their eccentricity design, and the low outer diameter accuracy or surface defects of some products, make it difficult for traditional positioning methods to simultaneously achieve precise radial and axial constraints. This can easily lead to misalignment during machining due to cutting forces, vibrations, and other factors, resulting in the coaxiality of the gear teeth failing to meet design requirements. On the other hand, existing positioning devices lack versatility. For eccentric gears of different specifications and thicknesses, specialized positioning fixtures are often required, leading to cumbersome operations, long mold change times, and significantly impacting machining efficiency. Furthermore, traditional positioning devices often rely on manual adjustment and clamping, making positioning accuracy dependent on operator experience, highly subjective, and unable to monitor misalignment in real time, hindering timely fine-tuning and calibration, further reducing the consistency and reliability of gear tooth machining.

[0004] Furthermore, as the manufacturing industry transforms and upgrades towards automation and intelligence, press production lines are placing higher demands on the processing efficiency and precision of eccentric gears. Existing positioning devices have low levels of automation; from workpiece clamping and positioning adjustment to post-processing handling, significant manual intervention is required. This not only increases labor costs but also makes them prone to positioning deviations due to human error, failing to meet the high-efficiency operation requirements of modern production lines. In the processing of large eccentric gears used in large presses, the welding process is complex. Different steel grades are prone to stress deformation after welding, and high precision requirements exist for eccentricity and symmetry. Traditional positioning devices struggle to meet the coaxial positioning requirements of tooth holes under such complex conditions, becoming a key bottleneck restricting the improvement of eccentric gear processing quality and overall press performance.

[0005] Therefore, developing a coaxial positioning device for the eccentric gear tooth hole of a press with high precision, high versatility, and high degree of automation can effectively solve the problems of insufficient precision, poor versatility, and low level of automation in existing positioning technologies. This has important practical significance and engineering application value for improving the processing quality of eccentric gears, increasing production efficiency, and promoting the technological upgrading of press equipment. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a coaxial positioning device for tooth holes based on eccentric gears in a press, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a coaxial positioning device for the tooth hole of an eccentric gear in a press, comprising: a worktable and a coaxial positioning mechanism;

[0008] The top of the workbench is equipped with a rotary table for supporting the rotation of the eccentric gear body and a geared motor for driving the rotation of the rotary table; the coaxial positioning mechanism includes an axial positioning unit and an outer circle positioning unit; the axial positioning unit includes a positioning cylinder for inserting into the eccentric hole or center hole of the eccentric gear body, and the positioning cylinder is provided with an end face pressure member for cooperating with the rotary table to press the end face of the eccentric gear body to ensure that the eccentric gear body does not shift during processing; the outer circle positioning unit includes several abutting members with adjustable abutting distance, and the abutting ends of the several abutting members are ball-shaped and in close contact with the outer circle of the eccentric gear body.

[0009] Preferably, the rotary table has a transverse sliding groove inside, and the bottom of the positioning shaft cylinder is slidably connected to the inside of the transverse sliding groove through a slider group, sliding along a horizontal trajectory; the inside of the transverse sliding groove is equipped with an adjusting cylinder for adjusting the horizontal position of the positioning shaft cylinder, so that the positioning shaft cylinder can be inserted into the eccentric holes of different eccentric gear bodies for axial positioning.

[0010] Preferably, the end face pressing component includes a plurality of pressing blocks disposed inside the positioning shaft cylinder, and the force-bearing end of the pressing block is equipped with a spring for elastically squeezing the pressing block, so that the pressing block extends out of the positioning shaft cylinder and presses the end face of the eccentric gear body.

[0011] Preferably, the positioning shaft cylinder has a movable frame and an electric telescopic rod for adjusting the height of the movable frame slidably connected axially inside, and several pressure blocks are slidably connected to the top of the movable frame in a circular array, and several springs are fixedly connected to the movable frame; the electric telescopic rod is fixed inside the positioning shaft cylinder and is used to adjust the height of the movable frame, forming a pressure block pressing on eccentric gear bodies of different thicknesses.

[0012] Preferably, the outer surface of the positioning cylinder has an axial groove with the same number as the pressure blocks, and the pressing ends of several pressure blocks extend to the outside of the positioning cylinder through the axial grooves; the top of several pressure blocks is set as an inclined surface Q, and a toggle rod W is fixedly connected to the inner top of the axial groove. The toggle rod W is used to contact the inclined surface Q of the top of the upward-moving pressure block. As the pressure block continues to rise, the toggle rod W limits the pressure block through the inclined surface Q, so that the pressure block automatically retracts into the positioning cylinder.

[0013] Preferably, the clamping component includes a clamping cylinder fixed to the top of the workbench by a mounting bracket. The extension end of the clamping cylinder is fixedly connected to a clamping rod, and the clamping end of the clamping rod is ball-shaped. A sensor group is provided on the clamping rod to detect the pressure and displacement of the clamping rod, to understand the offset of the eccentric gear body during the processing in real time, and to fine-tune and calibrate the eccentric gear body by extending and retracting the clamping cylinder.

[0014] Preferably, the outer circle positioning unit further includes an auxiliary ring plate, which is detachably installed on the end face of the eccentric gear body and is used to form the positioning of the eccentric gear body by directly pressing and positioning the auxiliary ring plate with several clamping members.

[0015] Preferably, the auxiliary ring plate contacts the top of the eccentric gear body, and an annular positioning groove E is provided on the outer surface of the auxiliary ring plate. The ball-shaped abutting end of the abutting rod is positioned in the annular positioning groove E. The auxiliary ring plate is provided with mounting parts.

[0016] Preferably, the mounting component includes several L-shaped rods disposed at the bottom of the auxiliary ring plate, and one end of each L-shaped rod is fitted with a clamping part for clamping and fixing the tooth width extension T of the eccentric gear body. The several L-shaped rods are arranged in a circular array. A driving ring plate is slidably connected to the inner surface of the auxiliary ring plate. Several inclined transmission grooves R are opened inside the driving ring plate, and the top end of the L-shaped rod extends into the inclined transmission groove R. Through the displacement of the inclined transmission groove R, the L-shaped rod drives the clamping part to extend and retract, thereby performing clamping and fixing control. At least one driving cylinder for circumferential adjustment of the driving ring plate is installed on the auxiliary ring plate.

[0017] Preferably, the workbench is provided with two telescopic columns inside, and the telescopic ends of the two telescopic columns extend into the opening at the top of the rotary table and are flush with the top of the workbench; a lifting cylinder is fixedly connected to the top of the support platform, and the telescopic end of the lifting cylinder is fixed to the telescopic ends of the two telescopic columns through a connecting frame; a support platform is rotatably connected to the inner bottom of the workbench, and the bottoms of the two telescopic columns and the lifting cylinder are fixed to the support platform.

[0018] Compared with the prior art, the present invention provides a coaxial positioning device for tooth holes based on eccentric gears of a press, which has the following advantages: The present invention adopts the collaborative operation of an axial positioning unit and an outer circle positioning unit. The axial positioning unit achieves preliminary positioning by inserting a positioning shaft into the eccentric hole or central hole of the eccentric gear body. With the elastic clamping of the end face pressure member, the axial and radial displacement of the gear is effectively restricted. The multiple clamping members of the outer circle positioning unit are arranged in a ring array. The ball-shaped clamping end is tightly fitted with the outer circle of the gear or the auxiliary ring plate. Combined with the real-time detection of pressure and displacement by the sensor group, and fine-tuning calibration by the cylinder, the dual positioning mechanism greatly improves the coaxiality of the tooth holes, avoids the accuracy error caused by gear offset during processing, and ensures the processing quality of the tooth holes.

[0019] This invention utilizes an electric telescopic rod to drive the moving frame for automatic pressing and retraction of the end face pressing component, eliminating the need for manual operation. The sensor group and cylinder of the outer circle positioning unit form a closed-loop control, automatically completing offset detection and fine-tuning calibration. After processing, the lifting cylinder drives the telescopic column to rise synchronously, quickly disengaging from the gears and positioning shaft for easy handling and replacement. Fully automated operation reduces manual intervention, shortens positioning and part changeover time, and improves overall processing efficiency.

[0020] This invention addresses situations where the outer diameter of an eccentric gear has low precision or defects. It allows for indirect positioning via an auxiliary ring plate, achieving precise gear positioning through the high-precision reference transmission of the auxiliary ring plate. The device's adjustment mechanism and detachable component design enable it to meet the machining and positioning requirements of conventional eccentric gears as well as adapt to machining scenarios with gears of special specifications or surface conditions, significantly expanding the device's application range and improving its flexibility. Attached Figure Description

[0021] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a structural disassembly schematic diagram of the present invention; Figure 3 is a cross-sectional schematic diagram of the present invention; Figure 4 is a partial enlarged view of point A in Figure 3 of the present invention; Figure 5 is a partial enlarged view of point B in Figure 3 of the present invention; Figure 6 is a structural schematic diagram of the outer circle positioning unit of the present invention.

[0022] In the diagram: 10. Workbench; 11. Rotary table; 12. Gear motor; 13. Telescopic column; 14. Lifting cylinder; 20. Eccentric gear body; 30. Axial positioning unit; 31. Positioning shaft cylinder; 32. Adjusting cylinder; 33. Pressure block; 34. Spring; 35. Moving frame; 36. Electric telescopic rod; 40. Outer circle positioning unit; 41. Clamping cylinder; 42. Clamping rod; 43. Sensor group; 44. Auxiliary ring plate; 45. L-shaped rod; 46. Drive ring plate; 47. Drive cylinder. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Example 1: Referring to Figures 1 to 6, a coaxial positioning device for the tooth hole of an eccentric gear in a press includes: a worktable 10 and a coaxial positioning mechanism; a rotary table 11 for rotating and supporting the eccentric gear body 20 and a geared motor 12 for rotating and driving the rotary table 11 are mounted on the top of the worktable 10; the core components of this device include the worktable 10 and the coaxial positioning mechanism, wherein the worktable 10 serves as the mounting reference and support carrier of the overall device, and the rotary table 11 mounted on its top is connected to the worktable 10 using high-precision rolling bearings, which can achieve stable rotational support for the eccentric gear body 20 and ensure the consistency of the gear's rotation trajectory during processing. The geared motor 12 is connected to the power input end of the rotary table 11 through a coupling, providing precise and controllable rotational power to the rotary table 11. The output speed can be adjusted according to the processing requirements to achieve uniform rotation of the eccentric gear body 20, ensuring the uniformity of subsequent tooth hole processing.

[0025] The coaxial positioning mechanism includes an axial positioning unit 30 and an outer circle positioning unit 40. The axial positioning unit 30 includes a positioning cylinder 31 for inserting into the eccentric hole or center hole of the eccentric gear body 20, and the positioning cylinder 31 is provided with an end face pressure member for cooperating with the rotary table 11 to press the end face of the eccentric gear body 20 to ensure that the eccentric gear body 20 does not shift during the processing. The outer circle positioning unit 40 includes several abutting members with adjustable abutting distance. The abutting ends of the several abutting members are ball-shaped and abut against the outer circle of the eccentric gear body 20.

[0026] The coaxial positioning mechanism, consisting of an axial positioning unit 30 and an outer cylindrical positioning unit 40, works together to achieve high-precision positioning of the eccentric gear body 20. The positioning cylinder 31 in the axial positioning unit 30 is made of high-strength alloy steel, and its outer diameter precisely matches the size of the eccentric hole or central hole of the eccentric gear body 20. Initial axial positioning of the gear is achieved by inserting it into the hole. The end face pressure member on the positioning cylinder 31 cooperates with the rotary table 11 to form a bidirectional pressure on the end face of the eccentric gear body 20. Utilizing the pressure locking principle, this effectively limits the axial and radial displacement of the gear during processing, avoiding positioning offset caused by cutting forces and other factors, and ensuring the coaxiality requirements of the gear hole machining. Several adjustable clamping parts of the outer circular positioning unit 40 are arranged in a ring array on the top of the worktable 10. The clamping ends are designed as ball bearings and made of high-hardness wear-resistant material. When in contact with the outer circle of the eccentric gear body 20, the sliding friction can be converted into rolling friction, reducing the damage to the outer circle surface of the gear during the clamping process. At the same time, by adjusting the clamping distance, the clamping parts are made to fit tightly with the outer circle of the gear, forming a radial positioning constraint, which further improves the overall positioning accuracy.

[0027] Referring to Figure 3, the inside of the rotary table 11 is provided with a transverse sliding groove, and the bottom of the positioning shaft cylinder 31 is slidably connected to the inside of the transverse sliding groove through a slider group, and slides in a horizontal trajectory; the inside of the transverse sliding groove is equipped with an adjusting cylinder 32 for adjusting the horizontal position of the positioning shaft cylinder 31, so that the positioning shaft cylinder 31 can be inserted into the eccentric holes of different eccentric gear bodies 20 for axial positioning.

[0028] The transverse sliding groove inside the rotary table 11 is formed by precision milling. The inner wall of the groove is hardened and precision ground to ensure that its straightness and surface roughness meet the requirements of high-precision sliding. The slider assembly at the bottom of the positioning shaft cylinder 31 consists of a slider and a guide rail. The guide rail is fixedly connected to the transverse sliding groove, and the slider is rigidly connected to the bottom of the positioning shaft cylinder 31. The slider and the guide rail are fitted with a clearance fit, and the fit accuracy is controlled at the micron level to ensure that the positioning shaft cylinder 31 slides smoothly along the transverse sliding groove.

[0029] The adjusting cylinder 32 installed inside the transverse slide is a servo-controlled cylinder. Its piston rod is fixedly connected to the slider at the bottom of the positioning shaft cylinder 31 through a connecting seat. The adjusting cylinder 32 can receive instructions from the control system to precisely extend and retract according to the eccentric hole position parameters of different eccentric gear bodies 20, thereby driving the positioning shaft cylinder 31 to adjust its position in the horizontal direction. This allows the positioning shaft cylinder 31 to be accurately inserted into the eccentric holes of different specifications of eccentric gear bodies 20, realizing universal axial positioning for different types of eccentric gears and improving the applicability and flexibility of the device.

[0030] Referring to Figures 3 and 4, the end face pressing component includes several pressing blocks 33 disposed inside the positioning shaft cylinder 31, and the force-bearing end of the pressing block 33 is equipped with a spring 34 for elastically squeezing the pressing block 33, so that the pressing block 33 extends out of the positioning shaft cylinder 31 and presses the end face of the eccentric gear body 20.

[0031] The pressure block 33 in the end face clamping component is made of high-quality structural steel, and its clamping end is polished to avoid indentation or damage to the end face of the eccentric gear body 20 during the clamping process. The spring 34 installed at the force-bearing end of the pressure block 33 is a high-strength compression spring with a stable elastic coefficient and good fatigue life. In its natural state, the spring 34 is in a compressed state, and the elastic restoring force generates a continuous elastic squeezing action on the pressure block 33, pushing the pressure block 33 to extend to the outside along the guide structure of the positioning shaft cylinder 31.

[0032] After the eccentric gear body 20 is placed on the rotary table 11 and initially positioned by the positioning cylinder 31, the extended pressure block 33 contacts the gear end face. The elastic pressure of the spring 34 is converted into a clamping force on the gear end face. Combined with the supporting force of the rotary table 11, it forms a clamping and fixing. By using the elastic clamping method, it can ensure sufficient clamping force to prevent gear deviation, and can also adapt to the small flatness error of the gear end face, realizing flexible clamping and avoiding gear deformation caused by rigid clamping.

[0033] Referring to Figures 3 and 4, the positioning cylinder 31 has a movable frame 35 and an electric telescopic rod 36 for adjusting the height of the movable frame 35 slidably connected axially inside. Several pressure blocks 33 are slidably connected to the top of the movable frame 35 in a circular array, and several springs 34 are fixedly connected to the movable frame 35. An axial guide structure is used inside the positioning cylinder 31 to achieve the sliding connection of the movable frame 35. The guide structure is typically a built-in guide rail or guide sleeve, ensuring that the movable frame 35 moves axially without offset or jamming, achieving high motion accuracy. The electric telescopic rod 36 is a high-precision ball screw type electric push rod. Its fixed end is rigidly connected to the fixed seat inside the positioning cylinder 31, and its telescopic end is fixedly connected to the movable frame 35 via a flange. The electric telescopic rod 36 can be driven by a servo motor to achieve precise adjustment of the height of the movable frame 35, with an adjustment accuracy of up to 0.01 mm. Several pressure blocks 33 are slidably connected to the top of the movable frame 35 in a circular array, so that the pressure blocks 33 can be adjusted in height synchronously with the movable frame 35. The two ends of the spring 34 are fixedly connected to the movable frame 35 and the pressure blocks 33 respectively, and always provide elastic clamping force to the pressure blocks 33.

[0034] The electric telescopic rod 36 is fixed inside the positioning shaft cylinder 31 and is used to adjust the height of the moving frame 35, forming a pressure block 33 to press the eccentric gear body 20 of different thicknesses.

[0035] The height of the moving frame 35 can be adjusted by the electric telescopic rod 36, which can change the length of the pressure block 33 extending out of the positioning shaft cylinder 31, thereby adapting to eccentric gear bodies 20 of different thicknesses. This ensures that the pressure block 33 can always be in close contact with the gear end face and provide a stable clamping force, achieving reliable clamping and positioning of gears of different thicknesses, and further improving the versatility and adaptability of the device.

[0036] Referring to Figure 4, the outer surface of the positioning cylinder 31 has an axial groove with the same number as the pressure block 33, and the pressing ends of several pressure blocks 33 extend to the outside of the positioning cylinder 31 through the axial groove. The number of axial grooves on the outer surface of the positioning cylinder 31 is the same as that of the pressure block 33, and the size of the groove is precisely matched with the cross-sectional size of the pressure block 33, providing precise guidance for the extension and retraction of the pressure block 33, while restricting the circumferential rotation of the pressure block 33, ensuring that the pressure block 33 can only extend and retract along the axial direction.

[0037] The top of each of the pressure blocks 33 is set as an inclined surface Q, and the inner top of the axial slide groove is fixedly connected to a toggle rod W. The toggle rod W is used to contact the inclined surface Q of the top of the upward-moving pressure block 33. As the pressure block 33 continues to rise, the toggle rod W limits the pressure block 33 through the inclined surface Q, so that the pressure block 33 automatically retracts into the positioning shaft cylinder 31.

[0038] The inclined surface Q on the top of the pressure block 33 is precision ground and the inclined angle is optimized to form a good contact fit with the actuating rod W fixedly connected to the top of the axial groove.

[0039] When the eccentric gear body 20 needs to be released, the electric telescopic rod 36 drives the moving frame 35 to move upward, causing the pressure block 33 to rise synchronously. At this time, the actuating rod W contacts the inclined surface Q at the top of the pressure block 33. As the pressure block 33 continues to rise, the actuating rod W generates a lateral force along the inclined direction on the inclined surface Q. This force is decomposed into a horizontal component that causes the pressure block 33 to retract into the positioning cylinder 31. Under the action of this component, the pressure block 33 overcomes the elastic force of the spring 34 and automatically retracts into the positioning cylinder 31 along the axial groove, realizing the automatic release of the pressure block 33. This forms a function of pressing down and tightening, and then moving up and retracting, eliminating the need for manual operation and improving the automation level and work efficiency of the device.

[0040] Referring to Figures 3, 5, and 6, the clamping component includes a clamping cylinder 41 fixed to the top of the worktable 10 via a mounting bracket. A clamping rod 42 is fixedly connected to the telescopic end of the clamping cylinder 41, and the clamping end of the clamping rod 42 is ball-shaped. The clamping cylinder 41 is fixed to the top of the worktable 10 via a mounting bracket, which is fixed to the worktable 10 by welding or bolting to ensure the stability and rigidity of the clamping cylinder 41. The telescopic end of the clamping cylinder 41 is connected to the clamping rod 42 by thread or welding. The clamping rod 42 is made of high-strength alloy material, possessing good rigidity and resistance to deformation. Its clamping end is designed as a ball, which reduces the contact area with the outer circle of the eccentric gear body 20, increases the pressure at the contact point, enhances positioning stability, and avoids scratching the outer circle of the gear.

[0041] A sensor group 43 is installed on the clamping rod 42 to detect the pressure and displacement of the clamping rod 42, to understand the offset of the eccentric gear body 20 in real time during the processing, and to fine-tune and calibrate the eccentric gear body 20 by extending and retracting the clamping cylinder 41.

[0042] The sensor group 43 mounted on the clamping rod 42 includes a pressure sensor and a displacement sensor. The pressure sensor is used to detect the contact pressure between the clamping rod 42 and the eccentric gear body 20 in real time, and the displacement sensor is used to detect the extension and retraction displacement of the clamping rod 42. During the machining process, if the eccentric gear body 20 shifts, it will cause changes in the pressure and displacement of the clamping rod 42. The sensor group 43 transmits the detected signals to the control system in real time. After analyzing and processing the signals, the control system sends a control command to the clamping cylinder 41. Through the precise extension and retraction of the clamping cylinder 41, the position of the eccentric gear body 20 is finely adjusted and calibrated to ensure that the gear is always in a precise positioning state throughout the machining process, thus ensuring the coaxiality accuracy of the tooth hole machining.

[0043] Referring to Figures 3, 5 and 6, the outer circle positioning unit 40 also includes an auxiliary ring plate 44, which is detachably mounted on the end face of the eccentric gear body 20. It is used to position the eccentric gear body 20 by directly pressing and positioning the auxiliary ring plate 44 with several clamping parts.

[0044] The auxiliary ring plate 44 configured in the outer circular positioning unit 40 is made of lightweight, high-strength alloy material. Its structural design meets the requirements of lightweighting and rigidity, avoiding additional load on the eccentric gear body 20 due to excessive weight. The auxiliary ring plate 44 adopts a detachable installation method, and is fixed to the end face of the eccentric gear body 20 through detachable structures such as bolt connections and snap-fit ​​connections, facilitating quick replacement and installation according to different specifications of eccentric gears. The outer circular dimension of the auxiliary ring plate 44 is designed as a standard size, and its roundness and cylindricity accuracy are higher than that of the outer circular dimension of the eccentric gear body 20. After the auxiliary ring plate 44 is fixed to the eccentric gear body 20, several clamping parts can directly clamp and position the outer circular dimension of the auxiliary ring plate 44. Due to the higher positioning reference accuracy of the auxiliary ring plate 44, the high-precision positioning of the auxiliary ring plate 44 can be transferred to the eccentric gear body 20 through the reference transfer principle, realizing indirect high-precision positioning of the gear. This is especially suitable for situations where the outer circular dimension accuracy of the eccentric gear body 20 is low or there are defects in the outer circular dimension, thus broadening the application scenarios of the device.

[0045] Referring to Figures 5 and 6, the auxiliary ring plate 44 contacts the top of the eccentric gear body 20, and an annular positioning groove E is provided on the outer surface of the auxiliary ring plate 44. The ball-shaped abutting end of the abutting rod 42 is inserted into the annular positioning groove E for positioning. An mounting component is provided on the auxiliary ring plate 44.

[0046] The top contact surfaces of the auxiliary ring plate 44 and the eccentric gear body 20 are precision ground to ensure their flatness and surface roughness, ensuring a tight fit with the gear end face and avoiding positioning errors caused by gaps in the contact surfaces. The annular positioning groove E on the outer surface of the auxiliary ring plate 44 is formed by turning. The width and depth of the groove are precisely matched with the dimensions of the ball-shaped abutment end of the clamping rod 42. When the ball-shaped abutment end of the clamping rod 42 is inserted into the annular positioning groove E, the two side walls of the annular positioning groove E can form a radial limit on the abutment end, restricting the radial displacement of the auxiliary ring plate 44 and further improving positioning stability. The mounting components on the auxiliary ring plate 44 include bolts, positioning pins, etc. The mounting components can achieve precise positioning and firm fixation of the auxiliary ring plate 44 and the eccentric gear body 20, ensuring no relative displacement between the two during processing, ensuring the consistency of the positioning reference, and thus achieving high-precision positioning of the eccentric gear body 20.

[0047] Example 2: The difference from Example 1 is that, referring to Figures 5 and 6, the mounting component includes several L-shaped rods 45 disposed at the bottom of the auxiliary ring plate 44. One end of each L-shaped rod 45 is fitted with a clamping part for clamping and fixing the tooth width extension T of the eccentric gear body 20. The L-shaped rods 45 are arranged in a circular array. The L-shaped rods 45 at the bottom of the auxiliary ring plate 44 are made of high-strength alloy material, possessing good rigidity and deformation resistance. Their circular array arrangement allows each L-shaped rod 45 to apply a uniform clamping force to the tooth width extension T of the eccentric gear body 20, preventing gear deformation or positioning misalignment due to uneven force. The clamping part at one end of the L-shaped rod 45 is made of wear-resistant rubber or hard alloy material. The contact surface between the clamping part and the tooth width extension T is machined for compatibility, ensuring a tight fit and improving the clamping and fixing effect.

[0048] A drive ring plate 46 is slidably connected to the inner surface of the auxiliary ring plate 44. The drive ring plate 46 has several inclined transmission grooves R inside, and the top end of the L-shaped rod 45 extends into the inclined transmission grooves R. The displacement of the inclined transmission grooves R causes the L-shaped rod 45 to drive the extension and retraction of the clamping part, achieving clamping and fixing control. The inner surface of the auxiliary ring plate 44 is slidably connected to the drive ring plate 46 via a guide rail structure. The guide rail structure ensures that the drive ring plate 46 can smoothly slide in an annular motion along the inner surface of the auxiliary ring plate 44. The several inclined transmission grooves R inside the drive ring plate 46 are precision milled, and the inclination angle is optimized according to the extension and retraction stroke requirements of the L-shaped rod 45. The top end of the L-shaped rod 45 extends into the inclined transmission grooves R, forming a sliding fit.

[0049] At least one drive cylinder 47 is installed on the auxiliary ring plate 44 for annular adjustment of the drive ring plate 46. When the drive cylinder 47 drives the drive ring plate 46 for annular adjustment, the inclined transmission groove R moves synchronously with the drive ring plate 46. The inner wall of the inclined transmission groove R contacts the top of the L-shaped rod 45 and generates a lateral force. This lateral force pushes the L-shaped rod 45 to extend and retract in the radial direction, thereby driving the clamping part to achieve clamping or loosening control of the tooth width extension T of the eccentric gear body 20. The at least one drive cylinder 47 installed on the auxiliary ring plate 44 is a double-acting cylinder. The air intake direction is controlled by a solenoid valve to realize the bidirectional annular movement of the drive ring plate 46. The piston rod of the drive cylinder 47 is connected to the drive ring plate 46 by a hinge to ensure the smoothness and accuracy of power transmission. Through this structural design, precise and uniform clamping and fixing of the tooth width extension T of the eccentric gear body 20 can be achieved, further improving the positioning accuracy and stability of the gear, and is suitable for machining scenarios with extremely high positioning accuracy requirements.

[0050] Example 3: Based on Example 1, the difference is that, referring to Figure 3, the worktable 10 has two telescopic columns 13 inside, and the telescopic ends of the two telescopic columns 13 extend into the opening at the top of the rotary table 11 and are flush with the top of the worktable 10; a lifting cylinder 14 is fixedly connected to the top of the support platform, and the telescopic end of the lifting cylinder 14 is fixed to the telescopic ends of the two telescopic columns 13 through a connecting frame, which is used to drive the two telescopic columns 13 to lift and remove the processed gear from the positioning end of the axial positioning unit 30 for replacement; the two telescopic columns 13 inside the worktable 10 are made of high-strength seamless steel pipe, which has good compressive strength and guiding performance. Their telescopic ends cooperate with the opening at the top of the rotary table 11 through guide sleeves. The guide sleeves are made of wear-resistant material to ensure the smoothness and accuracy of the telescopic movement of the telescopic columns 13.

[0051] The telescopic ends of the two telescopic columns 13 are flush with the top of the worktable 10, which avoids interference during gear placement and processing. The lifting cylinder 14, which is fixedly connected to the top of the support platform, is a high-thrust cylinder that can provide sufficient lifting force. Its telescopic end is fixedly connected to the telescopic ends of the two telescopic columns 13 through a connecting frame. The connecting frame adopts a rigid structure design to ensure that the power of the lifting cylinder 14 can be synchronously transmitted to the two telescopic columns 13, realizing the synchronous lifting and lowering of the two telescopic columns 13. The inner bottom of the worktable 10 is rotatably connected to the support platform, and the bottoms of the two telescopic columns 13 and the lifting cylinder 14 are all fixed to the support platform.

[0052] The inner bottom of the worktable 10 is rotatably connected to the support platform through a bearing structure. The bearing structure ensures that the support platform can rotate synchronously with the rotary table 11, avoiding rotational interference caused by the telescopic column 13 being fixed to the support platform.

[0053] After the eccentric gear body 20 is processed, the lifting cylinder 14 receives the control system command and drives the telescopic end to extend. Through the connecting frame, it drives the two telescopic columns 13 to lift synchronously. The top of the telescopic column 13 contacts the bottom of the gear and applies an upward lifting force, lifting the gear from the positioning shaft cylinder 31 of the axial positioning unit 30, so that the gear is separated from the positioning shaft cylinder 31. This makes it easier for operators to quickly change the gear, improves work efficiency, and avoids damage to the gear or positioning components when manually picking up the parts.

[0054] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coaxial positioning device for the tooth hole of an eccentric gear in a press, characterized in that, include: The worktable (10) and the coaxial positioning mechanism are provided. The top of the worktable (10) is equipped with a rotary table (11) for rotating support of the eccentric gear body (20) and a geared motor (12) for rotating drive of the rotary table (11). The coaxial positioning mechanism includes an axial positioning unit (30) and an outer circle positioning unit (40). The axial positioning unit (30) includes a positioning cylinder (31) for inserting into the eccentric hole or center hole of the eccentric gear body (20), and the positioning cylinder (31) is provided with an end face pressure member for cooperating with the rotary table (11) to press the end face of the eccentric gear body (20) to ensure that the eccentric gear body (20) does not shift during the processing. The outer circle positioning unit (40) includes a number of adjustable abutment members, and the abutment ends of the abutment members are ball-shaped and abut against the outer circle of the eccentric gear body (20).

2. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 1, characterized in that, The rotary table (11) has a transverse sliding groove inside, and the bottom of the positioning shaft cylinder (31) is slidably connected to the inside of the transverse sliding groove through a slider group, and slides in a horizontal trajectory; the inside of the transverse sliding groove is equipped with an adjusting cylinder (32) for adjusting the horizontal position of the positioning shaft cylinder (31), so that the positioning shaft cylinder (31) is inserted into the eccentric hole of different eccentric gear bodies (20) for axial positioning.

3. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 1, characterized in that, The end face pressing component includes several pressing blocks (33) disposed inside the positioning shaft cylinder (31), and the force-bearing end of the pressing block (33) is equipped with a spring (34) for elastically squeezing the pressing block (33) so that the pressing block (33) extends out of the positioning shaft cylinder (31) and presses the end face of the eccentric gear body (20).

4. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 3, characterized in that, The positioning cylinder (31) has a movable frame (35) and an electric telescopic rod (36) for adjusting the height of the movable frame (35) slidably connected in an axial manner inside. Several pressure blocks (33) are slidably connected to the top of the movable frame (35) in a circular array. Several springs (34) are fixedly connected to the movable frame (35). The electric telescopic rod (36) is fixed inside the positioning cylinder (31) and is used to adjust the height of the movable frame (35) to form the pressure blocks (33) pressing the eccentric gear bodies (20) of different thicknesses.

5. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 4, characterized in that, The outer surface of the positioning cylinder (31) is provided with an axial groove of the same number as the pressure block (33), and the pressing ends of several pressure blocks (33) extend to the outside of the positioning cylinder (31) through the axial groove; the top of several pressure blocks (33) is provided with an inclined surface Q, and a toggle rod W is fixedly connected to the inner top of the axial groove. The toggle rod W is used to contact the inclined surface Q of the top of the upward-moving pressure block (33). As the pressure block (33) continues to rise, the toggle rod W limits the pressure block (33) through the inclined surface Q, so that the pressure block (33) automatically retracts into the positioning cylinder (31).

6. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 1, characterized in that, The clamping component includes a clamping cylinder (41) fixed to the top of the workbench (10) by a mounting bracket. The extension end of the clamping cylinder (41) is fixedly connected to a clamping rod (42), and the clamping end of the clamping rod (42) is ball-shaped. A sensor group (43) is provided on the clamping rod (42) to detect the pressure and displacement of the clamping rod (42), to understand the offset of the eccentric gear body (20) in real time during the processing, and to fine-tune and calibrate the eccentric gear body (20) by extending and retracting the clamping cylinder (41).

7. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 6, characterized in that, The outer circle positioning unit (40) also includes an auxiliary ring plate (44), which is detachably installed on the end face of the eccentric gear body (20) and is used to form the positioning of the eccentric gear body (20) by directly pressing and positioning the auxiliary ring plate (44) with several clamping parts.

8. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 7, characterized in that, The auxiliary ring plate (44) contacts the top of the eccentric gear body (20), and an annular positioning groove E is provided on the outer surface of the auxiliary ring plate (44). The ball-shaped abutting end of the abutting rod (42) is inserted into the annular positioning groove E for positioning. An installation component is provided on the auxiliary ring plate (44).

9. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 8, characterized in that, The mounting component includes several L-shaped rods (45) disposed at the bottom of the auxiliary ring plate (44), and one end of the L-shaped rod (45) is fitted with a clamping part for clamping and fixing the tooth width extension T of the eccentric gear body (20). The several L-shaped rods (45) are arranged in a circular array. The inner surface of the auxiliary ring plate (44) is slidably connected to a drive ring plate (46). The drive ring plate (46) has several inclined transmission grooves R inside, and the top of the L-shaped rod (45) extends into the inclined transmission groove R. Through the displacement of the inclined transmission groove R, the L-shaped rod (45) drives the clamping part to extend and retract, thereby performing clamping and fixing control. At least one drive cylinder (47) for annular adjustment of the drive ring plate (46) is installed on the auxiliary ring plate (44).

10. The tooth hole coaxial positioning device based on the eccentric gear of a press according to claim 1, characterized in that, The workbench (10) is equipped with two telescopic columns (13) inside, and the telescopic ends of the two telescopic columns (13) extend into the opening at the top of the rotary table (11) and are flush with the top of the workbench (10); the top of the support platform is fixedly connected to a lifting cylinder (14), and the telescopic end of the lifting cylinder (14) is fixed to the telescopic ends of the two telescopic columns (13) through a connecting frame; the bottom of the workbench (10) is rotatably connected to a support platform, and the bottoms of the two telescopic columns (13) and the lifting cylinder (14) are fixed on the support platform.

Images