Double eccentric shaft anti-reverse device

Abstract

The utility model discloses a double eccentric shaft anti-reverse device relates to the field of machining, aims at solving the problem of easy reverse installation when double eccentric shaft grinding clamping depends on artificial judgment. The device includes hinge seat, positioning unit and connecting plate, and the hinge seat is fixedly connected to the machine table, and the positioning unit contains the positioning block with the arc surface, swing bar and the like, and the connecting plate connects the positioning unit and the protective cover. When the protective cover is opened, the connecting plate drives the positioning unit to return to the original position, the blocking pin is limited with the through groove, the positioning block is fixed, the circumference direction of the double eccentric shaft is forcedly restricted through the arc surface and the eccentric shaft neck two adaptation, and the reverse installation is avoided, when the protective cover is closed, the connecting plate pushes the positioning unit to swing and avoid, and it is prevented from interfering with the rotating shaft body and the cutter. Still can pass through the long hole, the detachable positioning block and so on adaptation different specifications work piece, need not extra power, and the versatility is strong, guarantees the machining accuracy and the efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically a double eccentric shaft anti-reverse mounting device. Background Technology

[0002] like Figure 1 The double eccentric shaft 100 shown includes a splined section 101 and a smooth rod section 102 arranged coaxially. Both the end faces of the splined section 101 and the smooth rod section 102 are machined with central positioning holes. Eccentric journal one 103 and eccentric journal two 104 are integrally formed between the splined section 101 and the smooth rod section 102. The diameters of both are larger than those of the splined section 101 and the smooth rod section 102. The axes of eccentric journal one 103 and eccentric journal two 104 are parallel to the axis of the splined section 101 and have the same offset. They are distributed 180° opposite to each other along the circumference of the splined section 101 or the smooth rod section 102. That is, the "outer protrusion" formed by the eccentricity of eccentric journal one 103 is completely opposite to the direction of the outer protrusion of eccentric journal two 104.

[0003] When performing fine grinding on the circumferential surfaces of eccentric journal 103 and eccentric journal 104, there is a clear orientation reference for clamping: First, the spline section 101 of the double eccentric shaft 100 needs to be fixed to the left side of the operator. This orientation is a fixed reference, and the operator can quickly identify it through the spline tooth structure without judgment error. Then, the left and right centers of the machine tool are used to press against the center positioning holes on the end faces of the spline section 101 and the guide rod section 102 respectively to achieve positioning. The CNC program of the machining center presets a unique correct clamping orientation: the convex part of the eccentric journal 103 near the spline section 101 needs to face the rear of the machining center, away from the operator. At this time, the initial orientation of the eccentric journal 103 is completely aligned with the program zero point.

[0004] However, the existing clamping scheme can only limit the left and right references by the position of the spline segment 101, but cannot constrain the circumferential orientation of the eccentric journal 103, resulting in the following key defects: 1. The eccentric orientation relies on manual visual judgment: With the spline section 101 fixed to the operator's left side, the convex parts of eccentric journal 103 and eccentric journal 2 104 are only "front and back in opposite directions" due to their 180° opposition, with no obvious visual markings to distinguish them. The operator needs to bend over to observe or manually rotate the shaft to determine whether the convex part of eccentric journal 103 is facing backward. It is very easy to cause the problem of reverse installation due to visual angle deviation, operator fatigue, or hasty operation. That is, the convex part of eccentric journal 103 is mistakenly facing forward of the operator, which is completely opposite to the "backward" orientation preset by the program. 2. Machining accuracy directly out of control: After reverse installation, the actual convex orientation of eccentric journal 103 is misaligned by 180° with the program zero point. The trajectory of the grinding tool will completely deviate from the theoretical machining path, directly causing dimensional deviations of eccentric journal 103 and eccentric journal 2 104, such as diameter and eccentricity deviations exceeding design tolerances, and non-compliance of form and position tolerances, such as cylindricity and coaxiality exceeding tolerances. 3. Reduced production efficiency: The problem of reverse installation can only be discovered during inspection after the machining is completed, resulting in the scrapping of the workpiece; or the machine tool alarm is triggered due to abnormal size during machining. Although it does not cause the workpiece to be scrapped, the machine must be stopped every time the alarm is triggered, the circumferential position of the shaft is readjusted and the tool is set again. A single rework can take 15-30 minutes.

[0005] Therefore, the existing clamping method can only constrain the left and right axial references of the double eccentric shaft 100, but lacks a forced constraint structure for the circumferential orientation of the eccentric journal 103. It relies entirely on the subjective judgment of the operator and cannot avoid the risk of reverse installation from the root. Utility Model Content

[0006] To limit the rearward orientation of the eccentric journal 103 to ensure consistent grinding precision and reduce scrap rate and rework costs, this utility model provides a double eccentric shaft anti-reverse mounting device. The technical solution adopted is as follows: A double eccentric shaft anti-reverse mounting device includes: The hinge base includes a base plate and two vertical plates fixed to the top surface of the base plate. The two vertical plates are symmetrically spaced apart, and each of the two vertical plates has a coaxial hinge hole at its upper end. The base plate is detachably fixed to the machine platform at the rear of the processing equipment by fastening screws. The top surface of the base plate between the two vertical plates has a through groove that is closed at the rear end and open at the front end. The length direction of the through groove is perpendicular to the axial direction of the double eccentric shaft. The positioning unit includes a positioning block, two rocker arms, a stop pin, a round pin, and a hinge shaft. One side of the positioning block is formed with an arc surface adapted to the outer circular surface of the eccentric journal of the double eccentric shaft, and the arc surface can fit against the outer circular surface of the eccentric journal. The two rocker arms are both in a "7" shape and are arranged side-by-side with intervals, their bent sections protruding forward. The upper ends of both rocker arms are fixedly connected to the side of the positioning block opposite to the arc surface. The stop pin is arranged perpendicular to the length of the rocker arm, and both ends of the stop pin are fixedly connected to the lower ends of the two rocker arms. The stop pin can be inserted intermittently into a groove and slide along the length of the groove. The round pin and the hinge shaft are both arranged perpendicular to the length of the rocker arms, and both are fixedly connected to the sidewalls of the two rocker arms near the stop pin. The hinge shaft is located above the round pin, and both ends of the hinge shaft are rotatably hinged to the hinge holes of the two vertical plates. A connecting plate, one end of which is rotatably connected to the inner wall of the protective cover at the rear of the processing equipment via a hinge, and the other end of which has a slot extending along its length, with the round pin passing through the slot and slidingly engaging with it. When the protective cover is opened by rotating clockwise around its hinge axis, the connecting plate rotates synchronously with the protective cover. The left side wall of the slot abuts against the round pin and pulls the round pin, causing the positioning unit to tend to swing to the left around the hinge axis. At this time, the stop pin abuts against the rear side wall of the slot, restricting the positioning unit from swinging to the left, so that the arc surface of the positioning block is fixed in a preset position that matches the second eccentric journal of the double eccentric shaft, providing a circumferential orientation constraint for the double eccentric shaft clamping and preventing the double eccentric shaft from being installed in reverse. When the protective cover rotates counterclockwise around its hinge axis to close, the connecting plate rotates synchronously in the opposite direction with the protective cover, and the round pin slides freely along the length of the slot. When the right side wall of the slot abuts against the round pin and pushes the round pin, the positioning unit swings clockwise around the hinge axis, so that the positioning block moves away from the clamped double eccentric shaft, avoiding interference with the rotating double eccentric shaft and the grinding tool.

[0007] Furthermore, elongated holes are provided on the top surface of the bottom plate on the outer side of the two upright plates, and the length direction of the elongated holes is set along the front-back direction; the fastening screw passes through the elongated hole and is threaded to the machine base. By adjusting the relative front-back position of the elongated hole and the fastening screw, the hinge can be moved along the front-back direction, thereby adjusting the relative distance between the positioning unit and the double eccentric shaft to adapt to double eccentric shafts of different specifications.

[0008] Furthermore, a T-shaped groove is provided on the side of the positioning block away from the arc surface, and the upper ends of the two swing arms are formed with T-shaped bosses that fit the T-shaped grooves; the T-shaped bosses are fitted into the T-shaped grooves with gaps, and a set screw is threaded on the side wall of the positioning block, with the end of the set screw abutting against the side wall of the T-shaped boss, so as to realize the detachable fixed connection between the positioning block and the swing arm, which facilitates the replacement of positioning blocks that are adapted to different diameter eccentric journals.

[0009] Furthermore, a torsion spring is sleeved on the outer side of the hinge shaft. One end of the torsion spring is fixed to the outer side wall of the upright plate, and the other end is fixed to the outer side wall of the swing rod. When the protective cover is flipped open clockwise, the torsion spring is in its natural state, and the auxiliary positioning unit remains in the working position. When the protective cover is flipped counterclockwise to push the positioning unit to swing, the torsion spring is twisted and stores force. When the protective cover is opened again, the rebound force of the torsion spring helps the positioning unit to quickly return to the working position.

[0010] Furthermore, a guide sleeve is fixedly connected to the end of the connecting plate near the slot. The inner hole of the guide sleeve is coaxial with the slot and the hole diameter is adapted. The two ends of the round pin pass through the inner hole of the guide sleeve, and the round pin slides with the guide sleeve. The guide sleeve limits the sliding direction of the round pin to prevent the connecting plate from twisting.

[0011] Furthermore, multiple spaced positioning grooves are provided on the inner wall of the elongated hole, and the bottom surface of the nut of the fastening screw is fixed with an elastic protrusion that matches the positioning groove; when the front and rear position of the hinge is adjusted, the elastic protrusion is engaged in the corresponding positioning groove to achieve temporary positioning of the hinge and prevent the hinge from shifting when the fastening screw is not fully tightened.

[0012] Furthermore, the positioning block has multiple weight-reducing holes spaced apart along the circumference on its arc surface. These weight-reducing holes are blind holes, and their axes are parallel to the normal direction of the arc surface. By reducing the weight of the positioning block through these holes, the inertia of the positioning unit during its swing is reduced, thereby improving the action response speed.

[0013] Furthermore, a limiting bolt is threaded onto the outer wall of the upright plate. The axis of the limiting bolt is set in the horizontal direction, and the end of the limiting bolt faces the swing rod. When the positioning unit swings clockwise to the avoidance position, the side wall of the swing rod abuts against the end of the limiting bolt, limiting the maximum swing angle of the positioning unit and preventing the positioning block from colliding with other parts of the processing equipment.

[0014] The beneficial technical effects of this utility model are as follows: 1. Forced constraint on circumferential orientation eliminates the risk of reverse installation. This device precisely fits the arc surface of the positioning unit with the second eccentric journal. Combined with the limiting effect of the stop pin and the rear side wall of the groove when the protective cover is opened, it directly fixes the positioning block in the only correct position where the "outer convex part of the first eccentric journal faces backward." If the operator mistakenly installs the double eccentric shafts backward (outer convex part of the first eccentric journal faces forward), the second eccentric journal cannot be matched with the arc surface of the positioning block, and the shaft cannot be pushed to the top position because it is blocked by the positioning block. From the mechanical structure level, it completely avoids the error of human judgment, solves the problem of reverse installation caused by the reliance on visual observation in the existing clamping, ensures that the initial position of the eccentric journal is completely aligned with the program zero point, and avoids the risk of loss of precision control such as dimensional deviation and non-compliance of geometric tolerance.

[0015] 2. Mechanically linked with the protective shield, requiring zero additional power cost. The device utilizes the opening and closing action of the existing protective cover of the processing equipment as the sole power source. Through the connecting plate, it achieves the linkage of "protective cover opening → positioning unit returning to position to prevent reverse installation" and "protective cover closing → positioning unit automatically avoiding" - without the need to add external power or electronic control components such as cylinders, motors, and sensors. This simplifies the structure (reducing failure points), lowers manufacturing and maintenance costs, and is suitable for working conditions with a lot of oil and dust. Its reliability is significantly better than solutions that require additional power.

[0016] 3. Automatic obstacle avoidance during processing completely prevents interference damage. When the protective cover is closed, the connecting plate pushes the round pin through the slot, causing the positioning unit to swing clockwise around the hinge axis, so that the positioning block is away from the rotation trajectory of the double eccentric shaft. This process does not require manual intervention, and the maximum swing angle is precisely controlled by the limit bolt (optional), ensuring that the positioning block and the rotating eccentric journal and grinding tool maintain a safe distance (≥8mm), completely solving the core contradiction of "anti-reverse installation structure and shaft rotation interference", and avoiding processing accidents such as tool collision and shaft scratch.

[0017] 4. Compatible with multiple specifications of double eccentric shafts, highly versatile. The device enhances adaptability through two major structural designs: First, the elongated hole in the base plate, in conjunction with the fastening screw, allows for adjustment of the hinge position to accommodate double eccentric shafts with different eccentricities. Second, the T-shaped slot and set screw connection between the positioning block and the swing arm allows for quick replacement of positioning blocks with different arc diameters to accommodate eccentric shaft journals of different diameters. This eliminates the need for separate tooling design for each specification of double eccentric shaft, significantly reducing tooling investment costs in multi-variety, small-batch production scenarios.

[0018] 5. Does not change existing operating procedures, easy to promote and implement. The device's operational logic is completely synchronized with the conventional operation of the processing equipment: operators only need to follow their existing habits of "opening the protective cover → clamping the workpiece → closing the protective cover → starting processing," without the need for additional steps such as "adjusting the tooling or triggering the switch," resulting in extremely low learning costs. Furthermore, the hinge seat can be detachably fixed to the machine base using fastening screws, eliminating the need for destructive modifications such as welding or drilling to the processing equipment itself. This allows for rapid adaptation to upgrades in existing grinding machining center production lines, making it highly adaptable and widely applicable.

[0019] 6. Structural details ensure stability and durability, with low maintenance costs. The device extends the service life of core components through detailed designs such as torsion spring-assisted reset (to avoid jamming of the positioning unit), guide sleeve limiting the sliding direction of the round pin (to prevent the connecting plate from twisting and the round pin from dislodging), and wear-resistant copper sleeve with self-lubricating coating (to reduce friction loss between the stop pin and the groove). Moreover, all components are mechanical structures without precision electronic components. In the later stage, only the wear of the connecting plate and hinge shaft needs to be checked periodically. The maintenance is simple and low-cost, meeting the durability requirements of continuous production in the factory. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an existing double eccentric shaft.

[0021] Figure 2 This is a schematic diagram of the structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the hinge seat of this utility model.

[0023] Figure 4This is a schematic diagram of the positioning unit of this utility model.

[0024] Figure 5 This is a schematic diagram of the connecting plate of this utility model.

[0025] Figure 6 This is a schematic diagram of the structure of this utility model when the protective cover is opened.

[0026] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0027] Figure 8 This is a schematic diagram of the structure of this utility model when the protective cover is closed.

[0028] Figure 9 for Figure 8 A magnified view of a section at point B. Detailed Implementation

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the "normal standing face of the person," which is the face facing the attached... Figure 1 The computer operation panel 101 is described in two ways: "up" and "down" correspond to the vertical position in space; "front" corresponds to the side closest to the computer operation panel 101, i.e., the side where the operator normally stands; "back" corresponds to the side furthest from the computer operation panel 101, i.e., the opposite side of the side where the operator normally stands; "left" corresponds to the left side of the operator's standing side; and "right" corresponds to the right side of the operator's standing side. These orientations or positional relationships are merely for the purpose of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] A double eccentric shaft anti-reverse mounting device, such as Figure 1-9 As shown, it includes: The hinge 1 includes a base plate 11 and two vertical plates 12 fixed to the top surface of the base plate 11. The two vertical plates 12 are symmetrically spaced apart, and each of the two vertical plates 12 has a coaxial hinge hole 121 at its upper end. The base plate 11 is detachably fixed to the machine base 200 at the rear of the processing equipment by fastening screws. The top surface of the base plate 11 located between the two vertical plates 12 has a through groove 13 that is closed at the rear end and open at the front end. The length direction of the through groove 13 is perpendicular to the axial direction of the double eccentric shaft 100. Positioning unit 2 includes a positioning block 21, two rocker arms 22, a stop pin 23, a round pin 24, and a hinge pin 25. One side of the positioning block 21 is formed with an arc surface 211 that fits the outer circular surface of the second eccentric journal 104 of the double eccentric shaft 100, and the arc surface 211 can fit snugly against the outer circular surface of the second eccentric journal 104. The two rocker arms 22 are both in a "7" shape and are arranged side-by-side with intervals, their bent sections protruding forward. The upper ends of both rocker arms 22 are fixed to the side of the positioning block 21 away from the arc surface 211. The stop pin 23 is arranged perpendicular to the length of the rocker arm 22, and both ends of the stop pin 23 are fixedly connected to the lower ends of the two rocker arms 22 respectively. The stop pin 23 can be inserted into the through groove 13 with a gap and slide along the length of the through groove 13. The round pin 24 and the hinge shaft 25 are both arranged perpendicular to the length of the rocker arm 22, and both are fixedly connected to the side wall of the two rocker arms 22 near the stop pin 23 respectively. The hinge shaft 25 is located above the round pin 24, and both ends of the hinge shaft 25 are rotatably hinged to the hinge holes 121 of the two upright plates 12 respectively. Connecting plate 3, one end of which is rotatably connected to the inner wall of the protective cover 300 on the rear side of the processing equipment via a hinge, and the other end of the connecting plate 3 is provided with a slot 31 extending along its length direction, and the round pin 24 is inserted into the slot 31 with a gap and slides into the slot 31. When the protective cover 300 is opened by rotating clockwise around its hinge axis, the connecting plate 3 rotates synchronously with the protective cover 300. The left side wall of the slot 31 abuts against the round pin 24 and pulls the round pin 24, causing the positioning unit 2 to have a tendency to swing to the left around the hinge axis 25. At this time, the stop pin 23 abuts against the rear side wall of the through slot 13, restricting the positioning unit 2 from swinging to the left, so that the arc surface 211 of the positioning block 21 is fixed in a preset position that matches the eccentric journal 104 of the double eccentric shaft 100, providing a circumferential orientation constraint for the clamping of the double eccentric shaft 100 and preventing the double eccentric shaft 100 from being installed in reverse. When the protective cover 300 rotates counterclockwise around its hinge axis to close, the connecting plate 3 rotates synchronously in the opposite direction with the protective cover 300, and the round pin 24 slides freely along the length direction of the slot 31. When the right side wall of the slot 31 abuts against the round pin 24 and pushes the round pin 24, the positioning unit 2 swings clockwise around the hinge axis 25, so that the positioning block 21 moves away from the clamped double eccentric shaft 100, avoiding interference with the rotating double eccentric shaft 100 and the grinding tool.

[0033] The following is the working principle and anti-reverse installation logic of this dual eccentric shaft anti-reverse installation device embodiment.

[0034] I. Overall Working Principle (Based on the Linkage Closed Loop of Protective Cover Opening and Closing) This device uses the opening and closing action of the processing equipment's protective cover as its sole power source. Through the mechanical linkage of "connecting plate-positioning unit-hinge seat," it achieves closed-loop control of "forced anti-reverse installation during clamping stage + automatic avoidance during processing stage," requiring no additional power throughout the process. The core is the deep integration of "circumferential orientation constraint of double eccentric shafts" with "normal operation of the protective cover," specifically divided into two key stages: II. Phased Workflow and Core Logic of Counter-Attack Phase 1: Open the protective cover → Clamp and position (critical phase for preventing reverse installation) 1. Linkage Trigger: The protective cover drives the positioning unit to return to its original position. When the operator opens the protective cover 300 on the back of the processing equipment (rotates clockwise around its hinge axis), the connecting plate 3, which is hinged to the inner side of the protective cover 300, rotates synchronously with the protective cover; the slot 31 at the end of the connecting plate 3 moves accordingly, and its left sidewall abuts against the round pin 24 of the positioning unit 2 and pulls the round pin 24 outward.

[0035] Since the hinge pin 25 of the positioning unit 2 is hinged to the vertical plate 12 of the hinge seat 1 (the hinge pin 25 is the fulcrum of rotation), the round pin 24 will cause the entire positioning unit 2 to swing to the left around the hinge pin 25 after being subjected to force (that is, the positioning block 21 moves closer to the direction of the double eccentric shaft 100).

[0036] 2. Limit Locking: The positioning block is fixed in the "anti-reverse installation preset position". The stop pin 23 of the positioning unit 2 passes through the groove 13 of the bottom plate 11 of the hinge seat 1. When the positioning unit 2 tends to swing to the left, the stop pin 23 will precisely abut against the rear side wall (closed end) of the groove 13. The rear side wall of the groove 13 restricts the stop pin 23 from moving further backward, which is then transmitted through the swing rod 22 to forcibly prevent the positioning unit 2 from swinging to the left, and finally stabilizes the positioning block 21 in the preset position.

[0037] At this time, the arc surface 211 of the positioning block 21 is exactly matched with the outer circular surface of the second eccentric shaft 104 when the double eccentric shaft 100 is correctly clamped (the outer convex part of the first eccentric shaft 103 faces backward) (because the first eccentric shaft 103 and the second eccentric shaft 104 are 180° opposite each other, the orientation of the second eccentric shaft 104 uniquely corresponds to the correct orientation of the first eccentric shaft 103).

[0038] 3. Anti-reverse mounting implementation: Forced constraint on the circumferential orientation of the double eccentric shafts When the operator clamps the double eccentric shaft 100 according to the fixed reference (spline segment 101 is placed on the left): -If the clamping is correct (the convex part of the eccentric journal 103 faces backward): the outer circular surface of the eccentric journal 204 can perfectly fit with the arc surface 211 of the positioning block 21, and the double eccentric shaft 100 can be smoothly pushed to the left and right center clamping positions of the machine tool to complete the clamping. - If the clamping is reversed (the convex part of eccentric journal 103 faces forward): Because eccentric journal 103 and eccentric journal 204 are 180° opposite each other, the convex part of eccentric journal 204 will be misaligned with the arc surface 211 of the positioning block 21 - eccentric journal 204 will abut against the non-arc side wall of the positioning block 21, and the double eccentric shaft 100 cannot be pushed to the top position. The operator will visually discover the clamping error and completely prevent reverse installation from the mechanical structure.

[0039] Phase 2: Protective shield closed → Processing avoidance (ensuring no interference) Once the double eccentric shaft 100 is correctly clamped, the operator closes the protective cover 300 (by rotating it counterclockwise around its hinge axis): - Connecting plate 3 rotates in the opposite direction synchronously with protective cover 300. Initially, round pin 24 will slide freely along the length of slot 31 of connecting plate 3 (to avoid forcibly pushing the positioning unit when the protective cover is just closed, and to reserve a buffer stroke). - When the protective cover 300 is nearly completely closed, the right side wall of the slot 31 abuts against the round pin 24 and pushes the round pin 24, causing the positioning unit 2 to swing clockwise around the hinge axis 25. - The positioning block 21 moves away from the double eccentric shaft 100 synchronously with the rocker arm 22, and finally avoids the rotation trajectory of the double eccentric shaft 100, so as to avoid interference with the rotating eccentric journal and grinding tool and ensure normal processing.

[0040] III. Summary of Core Anti-Counterattack Mechanisms This device achieves anti-reverse installation through a three-in-one design of "mechanical linkage + adaptive constraint + limit locking": 1. Linkage mechanism: The opening and closing action of the protective cover automatically drives the positioning unit to return to its original position / avoid obstacles, without the need for manual intervention; 2. Adaptation constraint: By adapting the positioning block to the arc surface of the second eccentric journal, the "correct orientation of the first eccentric journal" is transformed into the "fitting relationship between the second eccentric journal and the positioning block", thus achieving a unique orientation constraint. 3. Limit Locking: The anti-reverse installation position of the positioning block is fixed by the contact between the stop pin and the through groove, ensuring reliable constraint.

[0041] In summary, this approach ultimately avoids the risk of reverse assembly caused by human error at the source, while ensuring no interference during the processing stage, thus balancing error prevention accuracy and practicality.

[0042] In another preferred embodiment, elongated holes 14 are provided on the top surface of the base plates 11 on the outer sides of the two upright plates 12. The length direction of the elongated holes 14 is set along the front-back direction. The fastening screw passes through the elongated holes 14 and is threadedly fixed to the machine base 200. By adjusting the relative front-back position of the elongated holes 14 and the fastening screws, the hinge seat 1 can be moved along the front-back direction, thereby adjusting the relative distance between the positioning unit 2 and the double eccentric shaft 100 to adapt to double eccentric shafts 100 of different specifications. This embodiment uses elongated holes set along the front-back direction on the base plate to allow the hinge seat to be flexibly adjusted in the front-back direction, thereby changing the relative distance between the positioning unit and the double eccentric shaft. Its core advantage is that it can adapt to the processing needs of double eccentric shafts of different specifications (such as different eccentricities) without replacing the entire set of equipment, greatly improving the versatility of the equipment, reducing the cost of designing tooling separately for single-specification workpieces, and adapting to multi-variety, small-batch production scenarios.

[0043] In another preferred embodiment, the positioning block 21 has a T-shaped slot on the side opposite to the arc surface 211, and the upper ends of both swing arms 22 are formed with T-shaped bosses that fit the T-shaped slots. The T-shaped bosses are fitted into the T-shaped slots, and set screws are threaded onto the sidewalls of the positioning block 21. The ends of the set screws abut against the sidewalls of the T-shaped bosses, thus achieving a detachable connection between the positioning block 21 and the swing arms 22. This facilitates the replacement of positioning blocks 21 that are compatible with different diameter eccentric journals 104. This embodiment achieves a detachable connection between the positioning block and the swing arms by using the T-shaped slots of the positioning block and the T-shaped bosses of the swing arms, combined with set screws. Its core advantage is that positioning blocks compatible with different diameter eccentric journals 104 can be quickly replaced without altering the main structure of the swing arms. The operation is convenient and efficient, effectively solving the problem that workpieces with different journal diameters need to correspond to different positioning structures, and improving the flexibility and adaptability of the tooling.

[0044] In another preferred embodiment, a torsion spring is sleeved on the outer side of the hinge shaft 25. One end of the torsion spring is fixed to the outer wall of the upright plate 12, and the other end is fixed to the outer wall of the swing rod 22. When the protective cover 300 is flipped open clockwise, the torsion spring is in its natural state, and the auxiliary positioning unit 2 remains in the working position. When the protective cover 300 is flipped counterclockwise to push the positioning unit 2 to swing, the torsion spring is twisted and stores force. When the protective cover 300 is opened again, the rebound force of the torsion spring helps the positioning unit 2 to quickly return to the working position. This embodiment uses the torsion spring on the outer side of the hinge shaft to stably maintain the auxiliary positioning unit in the working position when the protective cover is open, avoiding displacement of the positioning block due to vibration and other factors. When the protective cover is closed and pushes the positioning unit to swing, the torsion spring stores force and provides rebound force when the protective cover is opened again, helping the positioning unit to quickly return to the working position. Its core advantage is that it enhances the reliability and response speed of the positioning unit's action, reduces problems such as positioning unit jamming and untimely reset, reduces the frequency of manual intervention and adjustment, and improves overall operating efficiency.

[0045] In another preferred embodiment, a guide sleeve is fixedly connected to the end of the connecting plate 3 near the slot 31. The inner hole of the guide sleeve is coaxial with the slot 31 and the hole diameter is adapted. Both ends of the round pin 24 pass through the inner hole of the guide sleeve, and the round pin 24 slides with the guide sleeve. The guide sleeve limits the sliding direction of the round pin 24, preventing the connecting plate 3 from twisting. This embodiment uses the guide sleeve at the end of the connecting plate to limit the sliding of the round pin along the axis of the slot, preventing the connecting plate from twisting or shifting due to uneven force during linkage. Its core advantage is that it ensures the accuracy of the "connecting plate-round pin" linkage structure, prevents the round pin from coming out of the slot or causing misalignment of the positioning unit due to deviation in the sliding direction, stabilizes the linkage logic of the device, reduces failures caused by structural deformation or misalignment, and extends the service life of the device.

[0046] In another preferred embodiment, multiple spaced positioning grooves are provided on the inner wall of the elongated hole 14, and the bottom surface of the nut of the fastening screw is fixed with an elastic protrusion that matches the positioning groove. When the front and back position of the hinge 1 is adjusted, the elastic protrusion engages in the corresponding positioning groove, achieving temporary positioning of the hinge 1 and preventing displacement of the hinge 1 when the fastening screw is not fully tightened. This embodiment achieves temporary positioning of the hinge after adjusting its front and back position by using the positioning groove on the inner side of the elongated hole and the elastic protrusion of the fastening screw nut. Its core advantage is that no continuous manual support is required during the adjustment process, preventing displacement of the hinge due to external force when the fastening screw is not fully tightened, simplifying the operation process of adjusting the hinge position, improving the accuracy and convenience of the adjustment process, and reducing the difficulty of installation and debugging.

[0047] In another preferred embodiment, the positioning block 21 has multiple weight-reducing holes spaced apart along the circumference on its arc surface 211. These weight-reducing holes are blind holes, and their axes are parallel to the normal direction of the arc surface 211. By reducing the weight of the positioning block 21 through these holes, the inertia of the positioning unit 2 during its swing is reduced, thus improving the action response speed. This embodiment reduces the weight of the positioning block by using blind holes on its arc surface, thereby reducing the inertia of the positioning unit during its swing. Its core advantage is that it makes the swinging action of the positioning unit more sensitive and responsive under the linkage of the protective cover, avoiding delays or positional deviations caused by excessive inertia. At the same time, it reduces the stress on the swing arm and hinge shaft, further improving the stability and structural durability of the device.

[0048] In another preferred embodiment, a limiting bolt is threaded onto the outer wall of the upright plate 12. The axis of the limiting bolt is horizontal, and the end of the limiting bolt faces the swing rod 22. When the positioning unit 2 swings clockwise to the avoidance position, the side wall of the swing rod 22 abuts against the end of the limiting bolt, limiting the maximum swing angle of the positioning unit 2 and preventing the positioning block 21 from colliding with other components of the processing equipment. This embodiment uses the limiting bolt on the upright plate facing the swing rod to abut against the swing rod when the positioning unit swings clockwise to the avoidance position, thus limiting the maximum swing angle of the positioning unit. Its core advantage is to prevent the positioning block from colliding with other components of the processing equipment (such as machine tool columns, fixtures, etc.) due to excessive swinging of the positioning unit. This protects the positioning block and the equipment from damage and avoids positional deviations caused by collisions, improving the safety and reliability of the device during use.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double eccentric shaft anti-reverse mounting device, characterized in that, include: The hinge base (1) includes a base plate (11) and two vertical plates (12) fixed to the top surface of the base plate (11). The two vertical plates (12) are symmetrically spaced apart, and the upper ends of the two vertical plates (12) are provided with coaxial hinge holes (121). The base plate (11) is detachably fixed to the machine table (200) on the rear side of the processing equipment by fastening screws. The top surface of the base plate (11) between the two vertical plates (12) is provided with a through groove (13) that is closed at the rear end and open at the front end. The length direction of the through groove (13) is perpendicular to the axial direction of the double eccentric shaft (100). The positioning unit (2) includes a positioning block (21), two rocker arms (22), a stop pin (23), a round pin (24), and a hinge pin (25). One side of the positioning block (21) is formed with an arc surface (211) that is adapted to the outer circular surface of the second eccentric journal (104) of the double eccentric shaft (100). The arc surface (211) can fit against the outer circular surface of the second eccentric journal (104). The two rocker arms (22) are both in the shape of a "7" and are arranged side by side with intervals. Their bent sections protrude forward, and the upper ends of the two rocker arms (22) are fixed to the side of the positioning block (21) away from the arc surface (211). The stop pin (23) is set perpendicular to the length of the rocker arm (22), and the two ends of the stop pin (23) are fixed to the lower ends of the two rocker arms (22) respectively. The stop pin (23) can pass through the through groove (13) and slide along the length of the through groove (13). The round pin (24) and the hinge shaft (25) are both set perpendicular to the length of the rocker arm (22), and they are fixed to the side walls of the two rocker arms (22) near the stop pin (23) respectively. The hinge shaft (25) is located above the round pin (24), and the two ends of the hinge shaft (25) are rotatably hinged to the hinge holes (121) of the two upright plates (12) respectively. Connecting plate (3), one end of the connecting plate (3) is rotatably connected to the inner wall of the protective cover (300) on the rear side of the processing equipment via a hinge, and the other end of the connecting plate (3) is provided with a slot (31) extending along its length direction, and the round pin (24) is inserted into the slot (31) with a gap and slides into the slot (31). When the protective cover (300) is opened by rotating clockwise around its hinge axis, the connecting plate (3) rotates synchronously with the protective cover (300). The left side wall of the slot (31) abuts against the round pin (24) and pulls the round pin (24), so that the positioning unit (2) has a tendency to swing to the left around the hinge axis (25). At this time, the stop pin (23) abuts against the rear side wall of the through slot (13), restricting the positioning unit (2) from swinging to the left, so that the arc surface (211) of the positioning block (21) is fixed in a preset position that matches the second eccentric journal (104) of the double eccentric shaft (100), providing a circumferential orientation constraint for the clamping of the double eccentric shaft (100) and preventing the double eccentric shaft (100) from being installed in reverse. When the protective cover (300) rotates counterclockwise around its hinge axis to close, the connecting plate (3) rotates synchronously in the opposite direction with the protective cover (300), and the round pin (24) slides freely along the length direction of the slot (31); when the right side wall of the slot (31) abuts against the round pin (24) and pushes the round pin (24), the positioning unit (2) swings clockwise around the hinge axis (25), so that the positioning block (21) moves away from the clamped double eccentric shaft (100) to avoid interference with the rotating double eccentric shaft (100) and the grinding tool.

2. The double eccentric shaft anti-reverse mounting device according to claim 1, characterized in that, Both of the two upright plates (12) have elongated holes (14) on their top surfaces. The length of the elongated holes (14) is set along the front-back direction. The fastening screw passes through the elongated holes (14) and is threaded to the machine base (200). By adjusting the relative front-back position of the elongated holes (14) and the fastening screw, the hinge seat (1) can be moved along the front-back direction, thereby adjusting the relative distance between the positioning unit (2) and the double eccentric shaft (100) to adapt to different specifications of double eccentric shafts (100).

3. The double eccentric shaft anti-reverse mounting device according to claim 1, characterized in that, The positioning block (21) has a T-shaped slot on the side away from the arc surface (211). The upper ends of the two swing rods (22) are formed with T-shaped bosses that are adapted to the T-shaped slots. The T-shaped bosses are inserted into the T-shaped slots, and the side wall of the positioning block (21) is threaded with a set screw. The end of the set screw abuts against the side wall of the T-shaped boss, so that the positioning block (21) and the swing rod (22) can be detachably fixed, which is convenient for replacing the positioning block (21) that is adapted to different diameter eccentric journals (104).

4. The double eccentric shaft anti-reverse mounting device according to claim 1, characterized in that, A torsion spring is fitted on the outer side of the hinge shaft (25). One end of the torsion spring is fixed to the outer wall of the upright plate (12), and the other end is fixed to the outer wall of the swing rod (22). When the protective cover (300) is flipped open clockwise, the torsion spring is in its natural state, and the auxiliary positioning unit (2) remains in the working position. When the protective cover (300) is flipped counterclockwise to push the positioning unit (2) to swing, the torsion spring is twisted and stores force. When the protective cover (300) is opened again, the rebound force of the torsion spring helps the positioning unit (2) to quickly return to the working position.

5. The double eccentric shaft anti-reverse mounting device according to claim 1, characterized in that, The connecting plate (3) is fixedly connected to a guide sleeve at the end near the slot (31). The inner hole of the guide sleeve is coaxial with the slot (31) and the hole diameter is matched. The two ends of the round pin (24) pass through the inner hole of the guide sleeve, and the round pin (24) slides with the guide sleeve. The sliding direction of the round pin (24) is limited by the guide sleeve to prevent the connecting plate (3) from twisting.

6. The double eccentric shaft anti-reverse mounting device according to claim 2, characterized in that, Multiple spaced positioning grooves are provided on the inner side wall of the elongated hole (14), and the bottom surface of the nut of the fastening screw is fixed with an elastic protrusion that matches the positioning groove. When the front and rear positions of the hinge (1) are adjusted, the elastic protrusion is inserted into the corresponding positioning groove to achieve temporary positioning of the hinge (1) and prevent the hinge (1) from shifting when the fastening screw is not fully tightened.

7. The double eccentric shaft anti-reverse mounting device according to claim 1, characterized in that, The positioning block (21) has multiple weight-reducing holes spaced apart along the circumference on its arc surface (211). The weight-reducing holes are blind holes, and the axis of the weight-reducing holes is parallel to the normal direction of the arc surface (211). The weight of the positioning block (21) is reduced by the weight-reducing holes, which reduces the inertia of the positioning unit (2) when it swings and improves the action response speed.

8. The double eccentric shaft anti-reverse mounting device according to claim 1, characterized in that, The outer wall of the upright plate (12) is threaded with a limit bolt. The axis of the limit bolt is set in the horizontal direction and the end of the limit bolt faces the swing rod (22). When the positioning unit (2) swings clockwise to the avoidance position, the side wall of the swing rod (22) abuts against the end of the limit bolt, limiting the maximum swing angle of the positioning unit (2) and preventing the positioning block (21) from colliding with other parts of the processing equipment.

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