A precision positioning mechanism and a multi-station index plate control system comprising the same

Abstract

The present application provides a kind of accurate positioning mechanism, including index plate assembly, it is rotationally arranged on rack assembly and the middle part is hollow;Elastic positioning pin assembly is vertically slidably arranged on the rack assembly, elastic positioning pin assembly can be intermittently inserted into the index plate assembly, to carry out circumferential rigid limiting to index plate assembly;And single servo cam drive system is installed on rack assembly, single servo cam drive system is drivingly connected with elastic positioning pin assembly, for driving elastic positioning pin assembly reciprocating sliding along vertical direction.The present application also provides a kind of multi-station index plate control system, using the above-mentioned accurate positioning mechanism, through single servo motor, mechanical hard synchronization of four core actions of limiting release, index rotation, positioning locking, tool lifting is realized, solves the technical problems that existing multi-drive system action coordination is difficult, machining precision is difficult to guarantee.

Description

Technical Field

[0001] This invention relates to the field of automated indexing equipment technology, and in particular to a precision positioning mechanism and a multi-station indexing control system including the mechanism. Background Technology

[0002] The multi-station indexing control system is one of the core components of an automated production line. It is used to realize the intermittent transfer and positioning of workpieces between different stations. Its positioning accuracy and operational reliability directly affect the production efficiency and product quality of the production line.

[0003] In existing technologies, commonly used indexing devices mainly include Geneva mechanisms and cam indexers. Geneva mechanisms have a simple structure, but suffer from low indexing accuracy, high impact, and poor stability at high speeds. Traditional cam indexers, while offering higher positioning accuracy, are complex in structure, expensive to manufacture, and the synchronization of indexing and positioning actions is difficult to control precisely, easily leading to overshoot or incomplete positioning. Furthermore, existing indexing devices often use rigid limit mechanisms, which are prone to wear after prolonged use, resulting in decreased positioning accuracy. They also lack overload protection mechanisms, making the equipment susceptible to damage from sudden overloads.

[0004] However, in actual work, it has been found that in existing workpiece processing technology, the need to configure multiple sets of driving forces leads to technical problems such as difficulty in coordinating the actions of each driving force and difficulty in ensuring processing accuracy. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by using a multi-action timing coupling precision positioning mechanism driven by a single servo motor and a multi-station indexing control system. This system utilizes a single driving force to simultaneously achieve strict timing coordination of four core actions: limit release, lifting and lowering of the processing equipment, indexing rotation, and positioning locking. It also solves the technical problem of high difficulty in coordinating the actions between different driving forces when multiple sets of driving forces are required in traditional vertical synchronous processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A precise positioning mechanism, comprising: The indexing plate assembly is rotatably mounted on the frame assembly and has a hollow center, which is used to carry the workpiece and realize the switching of work positions. A flexible positioning pin assembly, vertically slidable on the frame assembly, is capable of intermittently inserting into the indexing plate assembly to provide circumferential rigidity for limiting the indexing plate assembly; and A single servo cam drive system is mounted on a frame assembly. The single servo cam drive system is connected to the elastic positioning pin assembly and is used to drive the elastic positioning pin assembly to slide back and forth in the vertical direction.

[0007] Furthermore, the rack assembly includes: The double-layer base is a fixed connection structure consisting of upper and lower layers.

[0008] Furthermore, it is made of gray cast iron HT250 integral casting, and internal stress is eliminated by artificial aging treatment, which has excellent shock absorption performance and structural rigidity; A hollow support shaft, which is a hollow tubular structure, is coaxially connected to the upper center of the double-layer base, and can accommodate cables, air lines, and hydraulic lines; and The indexing guide plate is a hollow disc structure and is coaxially connected to the upper end of the hollow support shaft, providing high-precision rotation guidance and axial support for the indexing plate body.

[0009] Furthermore, the indexing plate assembly includes an indexing plate body rotatably fitted around the outer periphery of the indexing guide plate. The indexing plate body has multiple sets of precision positioning pin holes and multiple sets of tooling mounting holes coaxially formed from the inside out, with its center as the center.

[0010] Furthermore, the precision positioning pin hole is machined by reaming, with a tolerance grade of IT6 and a surface roughness Ra≤0.8μm.

[0011] Furthermore, the tooling mounting holes are countersunk, which facilitates the quick installation of various tooling fixtures.

[0012] Furthermore, the elastic positioning pin assembly includes a drive rod, a compression spring, and a positioning pin arranged coaxially from bottom to top.

[0013] Furthermore, the upper end of the compression spring is mounted on the frame assembly and connected to the drive rod, for applying an upward elastic force to the positioning pin, and also has an automatic positioning wear compensation function; The upper end of the positioning pin is matched and inserted into the precision positioning pin hole; Furthermore, the upper end of the positioning pin is provided with a 15° guide chamfer, and it is fitted with the precision positioning pin hole with an H7 / g6 clearance.

[0014] The upper side wall of the positioning pin is provided with a travel limiting boss, and the upper end face of the travel limiting boss intermittently abuts against the lower end face of the indexing guide plate to limit the upward limit travel of the positioning pin and prevent the mechanism from jamming.

[0015] Furthermore, the single servo cam drive system includes: A high-precision servo motor is fixedly installed on the upper layer of the double-layer base, and uses an absolute encoder with a positioning accuracy of ±1 arcsecond; The gear transmission unit includes a drive gear that is synchronously driven with the output shaft of the high-precision servo motor, a driven gear that meshes externally with the drive gear and is rotatably disposed on the upper layer of the double-layer base, and a disc cam that is coaxially fixedly connected to the driven gear and rotates synchronously. The driving gear and driven gear are machined by gear grinding, with a precision grade of GB / T10095.1-20086. The lever transmission mechanism includes an L-shaped lever arm rotatably mounted on the double-layer base. The lower end of the lever arm intermittently abuts against the disc cam, and its upper end is hinged to the lower end of the drive rod.

[0016] Furthermore, both the elastic positioning pin assembly and the lever transmission mechanism are provided in two sets; The two sets of gear transmission units are symmetrically arranged at the center of the indexing plate body; The lower ends of the lever arms of the two sets of lever transmission mechanisms are connected by a synchronous connecting rod to ensure that the two sets of elastic positioning pin assemblies move synchronously and avoid the indexing plate body being tilted on one side due to force.

[0017] A multi-station indexing control system employs the aforementioned precision positioning mechanism.

[0018] Furthermore, it also includes a grooved wheel-type indexing fork mechanism for driving the indexing plate body to rotate intermittently, which includes: A shift fork support seat, which is mounted on the indexing guide plate; A shift fork shaft passes through the shift fork support and is rotatably mounted on the shift fork support. The lower end of the shift fork shaft is synchronously driven with the drive shaft of the driven gear through a torque limiting clutch. The indexing block is eccentrically positioned at the upper end of the fork shaft.

[0019] Furthermore, the indexing block is made of Cr12MoV alloy steel, and its surface is nitrided to improve wear resistance; and Multiple indexing drive slots are evenly spaced along the circumference on the inner sidewall of the indexing plate body. The indexing block can rotate with the fork shaft and enter the indexing drive slot to drive the indexing plate body to rotate one position.

[0020] Furthermore, the output shaft of the high-precision servo motor is coaxially connected to a cam lifting column, and a sinusoidal guide groove is provided on the outer circumference of the cam lifting column to ensure smooth and impact-free lifting and lowering processes and continuous acceleration changes.

[0021] Furthermore, a tooling lifting column is elastically inserted through the indexing guide plate in the vertical direction, and a cam follower block that matches the sinusoidal guide groove is connected to the tooling lifting column; The tooling lifting column can be equipped with various precision machining tooling, such as turning heads, milling heads, laser detection probes, etc., to achieve synchronous processing of the upper and lower end faces of the workpiece.

[0022] The beneficial effects of this invention are: Compared with the prior art, the present invention has the following advantages: (1) This invention uses only one high-precision servo motor to simultaneously drive the limiting / unlocking action of the elastic positioning pin assembly, the indexing and indexing action of the slotted wheel indexing fork mechanism, and the lifting action of the tooling lifting column. Through precision mechanical transmission, the strict timing coordination of the four core actions is achieved, eliminating the problem of asynchronous action caused by the cumulative electrical control error of multi-motor drive. The system reliability is greatly improved, and the repeatability accuracy can reach ±0.002mm, so as to realize the single-drive multi-action timing coupling technology.

[0023] (2) The present invention uses two sets of centrally symmetrically arranged elastic positioning pin components, which not only maximizes the control of positioning error, but also, based on the principle of three points to determine the circle, this solution sets two sets of elastic positioning pin components symmetrically on both sides of the center of the indexing plate component. When the two sets of components are accurately inserted, the high-precision positioning of the indexing plate component can be quickly achieved, thereby greatly improving the workpiece processing accuracy at the corresponding workstation of the indexing device. At the same time, it can also effectively prevent the indexing plate component from tilting during the limit work, ensuring processing accuracy and work safety. (3) The present invention utilizes the hollow structure of the indexing plate body and the frame assembly. Its integrated hollow structure design integrates the upper and lower processing mechanisms inside the indexing device, reducing the equipment footprint. Once the upper and lower processing stations are aligned with the indexing station, no further adjustments are needed, shortening the adjustment cycle.

[0024] (4) The present invention provides a torque limiting clutch in the indexing fork mechanism, which automatically slips to protect the core components when overloaded; the elastic positioning pin assembly has a built-in compression spring, which can automatically compensate for the wear of the positioning pin and positioning hole, thus extending the service life of the equipment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the precision positioning mechanism described in this invention; Figure 2 This is a top view of the precise positioning mechanism described in this invention. Figure 3This is a cross-sectional structural diagram of the elastic positioning pin assembly described in this invention; Figure 4 This is a schematic diagram of the cooperation structure between the cam lifting column and the tooling lifting column described in this invention; Figure 5 This is a schematic diagram of the overall structure of the multi-station indexing control system described in this invention; Figure 6 This is a schematic diagram of the transmission connection between the single servo cam drive system and the slotted wheel indexing fork mechanism described in this invention. Figure 7 This is a three-dimensional structural diagram of the multi-station indexing control system described in this invention; Figure 8 This is a partially enlarged structural schematic diagram of the grooved wheel indexing fork mechanism described in this invention.

[0027] Explanation of markings in the diagram: 1-Frame assembly, 11-Double-layer base, 12-Hollow support shaft, 13-Indexing guide plate, 2-Indexing plate assembly, 21-Indexing plate body, 22-Precision locating pin hole, 23-Tooling mounting hole, 3-Elastic locating pin assembly, 31-Drive rod, 32-Compression spring, 33-Locking pin, 34-Stroke limit boss, 4-Single servo cam drive system, 41-High-precision servo motor, 42-Gear transmission unit, 42 1-Driving gear, 422-Driven gear, 423-Disc cam, 43-Lever transmission mechanism, 431-Lever swing arm, 44-Synchronous linkage, 5-Gate wheel indexing fork mechanism, 51-Fork support, 52-Fork shaft, 53-Torque limiting clutch, 54-Indexing block, 55-Indexing drive groove, 6-Tooling lifting mechanism, 61-Cam lifting column, 62-Sine curve guide groove, 63-Tooling lifting column, 64-Cam driven block Detailed Implementation The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] Example 1 like Figure 4-8 As shown, a precise positioning mechanism includes: Rack assembly 1; Indexing plate assembly 2 is rotatably mounted on the frame assembly 1, and the middle part of the indexing plate assembly 2 is hollow; The elastic positioning pin assembly 3 is slidably disposed on the frame assembly 1 in the vertical direction. The elastic positioning pin assembly 3 can be intermittently inserted into the indexing plate assembly 2 to provide circumferential rigid limiting for the indexing plate assembly 2. A single servo cam drive system 4 is fixedly installed on the frame assembly 1. The single servo cam drive system 4 is connected to the elastic positioning pin assembly 3 for driving the elastic positioning pin assembly 3 to slide back and forth in the vertical direction.

[0029] Furthermore, the rack assembly 1 includes: The double-layer base 11 is a fixed connection structure with upper and lower layers; The hollow support shaft 12 is a hollow tubular structure, and the lower end of the hollow support shaft 12 is fixedly connected to the upper center of the double-layer base 11. The indexing guide disk 13 is a hollow disk-shaped structure, and the lower center of the indexing guide disk 13 is fixedly connected to the upper end of the hollow support shaft 12.

[0030] Furthermore, the indexing plate assembly 2 includes an indexing plate body 21 rotatably sleeved on the outer periphery of the indexing guide plate 13. The indexing plate body 21 has multiple sets of precision positioning pin holes 22 and multiple sets of tooling mounting holes 23 coaxially opened from the inside to the outside with its center as the center. The precision positioning pin holes 22 and the tooling mounting holes 23 are evenly spaced along the circumference of the indexing plate body 21.

[0031] Multiple sets of tooling mounting holes 23 are used to install tooling fixtures that support the workpiece.

[0032] Furthermore, the elastic positioning pin assembly 3 includes a drive rod 31, a compression spring 32, and a positioning pin 33 arranged coaxially from bottom to top; The two ends of the compression spring 32 are fixedly connected to the upper end of the drive rod 31 and the lower end of the positioning pin 33, respectively, and are used to apply an upward elastic preload to the positioning pin 33. The upper end of the compression spring 32 is mounted on the frame assembly 1 and connected to the drive rod 31. It is used to apply an upward elastic force to the positioning pin 33 and also has an automatic positioning wear compensation function. The upper end of the positioning pin 33 is matched and inserted into the precision positioning pin hole 22; The upper side wall of the positioning pin 33 is fixedly provided with a travel limiting boss 34. The upper end surface of the travel limiting boss 34 intermittently abuts against the lower end surface of the indexing guide plate 13 to limit the upward limit travel of the positioning pin 33.

[0033] It should be noted that when the positioning pin 33 is inserted into the precision positioning pin hole 22 of the indexing plate body 21, the indexing plate body 21 is rigidly fixed in the circumferential direction.

[0034] In this embodiment, the elastic positioning pin assembly 3 has a built-in compression spring 32, which can effectively buffer the impact during the limiting and extend the service life of the component; the setting of the stroke limiting boss 34 can prevent the positioning pin 33 from rising excessively and avoid the mechanism from jamming.

[0035] Furthermore, the single servo cam drive system 4 includes: A high-precision servo motor 41 is fixedly installed on the upper layer of the double-layer base 11. The output axis of the high-precision servo motor 41 extends upward and is eccentrically positioned in the hollow area of ​​the indexing plate body 21. The gear transmission unit 42 includes a drive gear 421 that is synchronously driven with the output shaft of the high-precision servo motor 41, a driven gear 422 that meshes with the drive gear 421 and is rotatably disposed on the upper layer of the double-layer base 11, and a disc cam 423 that is coaxially fixedly connected to the driven gear 422 and rotates synchronously. The lever transmission mechanism 43 includes an L-shaped lever arm 431 rotatably disposed on the upper layer of the double-layer base 11. The lower end of the lever arm 431 intermittently abuts against the outer peripheral surface of the disc cam 423, and the upper end of the lever arm 431 is hinged to the lower end of the drive rod 31.

[0036] The release of the limit is specifically as follows: The high-precision servo motor 41 starts, driving the drive gear 421 to rotate. The drive gear 421 drives the driven gear 422 to rotate, and the driven gear 422 drives the disc cam 423 to rotate synchronously. The lift section of the disc cam 423 pushes the lower end of the L-shaped lever arm 431 to rotate outward, and the upper end of the L-shaped lever arm 431 drives the drive rod 31 to move downward, stretching and compressing the spring 32, causing the positioning pin 33 to be pulled out of the precision positioning pin hole 22, thus releasing the limit on the indexing plate body 21. The two sets of L-shaped lever arms 431 rotate synchronously through the synchronous connecting rod 44, ensuring that the two positioning pins 33 are pulled out simultaneously.

[0037] Furthermore, both the elastic positioning pin assembly 3 and the lever transmission mechanism 43 are provided in two sets; the two sets of gear transmission units 42 are symmetrically arranged about the center of the indexing plate body 21; the lower ends of the lever swing arms 431 of the two sets of lever transmission mechanisms 43 are connected by a synchronous connecting rod 44.

[0038] Example 2 like Figure 1-3 As shown, a multi-station indexing control system includes the precision positioning mechanism described in Embodiment 1.

[0039] Furthermore, it also includes a grooved wheel indexing fork mechanism 5 for driving the indexing plate body 21 to rotate intermittently, the grooved wheel indexing fork mechanism 5 comprising: The shift fork support 51 is fixedly installed on the upper end face of the indexing guide plate 13; The shift fork shaft 52 vertically passes through the shift fork support 51 and is rotatably mounted on the shift fork support 51. The lower end of the shift fork shaft 52 is synchronously driven with the drive shaft of the driven gear 422 through a torque limiting clutch 53. The torque limiting clutch 53 can automatically slip when the equipment is overloaded to protect the core components from damage. The indexing block 54 is eccentrically fixed at the upper end of the fork shaft 52; Multiple indexing drive slots 55 are evenly spaced along the circumference on the inner sidewall of the indexing plate body 21. The indexing block 54 can rotate with the fork shaft 52 and enter the indexing drive slot 55 to drive the indexing plate body 21 to rotate one position.

[0040] In this embodiment, the grooved wheel indexing fork mechanism 5 and the elastic positioning pin assembly 3 share the same high-precision servo motor drive. Through precision mechanical transmission, the strict timing coordination of the indexing action and the positioning action is achieved. There is no cumulative error in electrical control, which solves the problem of overshoot or incomplete positioning caused by asynchronous actions in traditional devices. The entire indexing system has a compact structure, few parts, low processing and assembly difficulty, low manufacturing cost, and is easy to maintain and repair.

[0041] When the equipment is overloaded, the torque limiting clutch 53 automatically slips, the shift fork shaft 52 stops rotating, while the high-precision servo motor 41 and the elastic positioning pin assembly 3 can still operate normally, effectively protecting the slotted wheel indexing shift fork mechanism and the indexing plate body 21 from damage.

[0042] In detail, the driven gear 422 drives the shift fork shaft 52 to rotate through the torque limiting clutch 53. The shift fork shaft 52 drives the indexing block 54 to rotate and enter the indexing drive groove 55 inside the indexing plate body 21, pushing the indexing plate body 21 to rotate and complete the switching of one work station.

[0043] Furthermore, a cam lifting column 61 is fixedly connected to the upper end of the output shaft of the high-precision servo motor 41, and a sinusoidal guide groove 62 is provided on the outer circumferential surface of the cam lifting column 61.

[0044] In this process, the cam lifting column 61 and the tooling lifting column 63 work together to lift the indexing plate body 21 upward by 0.5mm when it rotates, which greatly reduces the sliding friction between the indexing plate body and the indexing guide plate, reduces the operating noise of the equipment, and improves its service life.

[0045] Furthermore, a tooling lifting column 63 is elastically inserted through the indexing guide plate 13 along the vertical direction, and a cam follower block 64 is fixedly connected to the lower end of the tooling lifting column 63. The cam follower block 64 is slidably engaged with the sine curve guide groove 62.

[0046] The tooling lifting column 63 is coaxially arranged with the indexing guide plate 13, which facilitates the positioning of the workpiece on the indexing guide plate 13, so as to realize the precise control of the machining center mechanism on the equidistant position of any workpiece on the indexing guide plate 13. Therefore, the single servo cam drive system is set with an eccentric structure.

[0047] It should be noted that various precision machining fixtures, such as turning heads, milling heads, and laser detection probes, can be installed on the tooling lifting column 63. These fixtures can be located above or below the indexing plate body 21 to achieve synchronous machining of the upper or lower end face of the workpiece. According to the actual working conditions, by replacing the sinusoidal guide grooves with different lifting strokes, the requirements of different machining strokes can be quickly adapted without modifying the control system program.

[0048] In detail, when the indexing plate body 21 rotates to its position, the indexing block 54 rotates out of the indexing drive groove 55. At this time, the disc cam 423 rotates to the return section, the compression spring 32 quickly resets, and pushes the positioning pin 33 upward to accurately insert into the next precision positioning pin hole 22, thereby achieving precise positioning of the indexing plate body 21. At the same time, the cam lifting column 61 rotates to the lifting section of the sine curve guide groove 62, pushing the tooling lifting column 63 to rise or fall. The processing equipment on the tooling lifting column 63 moves to the surface to be processed on the workpiece for finishing, and resets and detaches from the workpiece after processing, achieving synchronous avoidance. The lifting column 61 rises or falls according to actual requirements to realize the finishing action of the processing equipment on the lifting column 6 on the workpiece, such as turning or milling.

[0049] In addition, the purpose of the elastic setting of the tooling lifting column 63 is to make the lifting action more effortless under the action of the return spring during the lifting process, and conversely, to prevent rapid falling during the descent process under the action of the return spring, thus ensuring processing safety.

[0050] Example 3 An operation method for a multi-station indexing control system based on Embodiment 2 specifically includes: Step 1, Indexing: When the locating pin 33 is fully pulled out of the precision locating pin hole 22, and the processing equipment on the tooling lifting column 63 is detached from the workpiece's surface to be processed, the indexing block 54 rotates precisely to the entrance of the indexing drive groove 55; the driven gear 422 drives the shift fork shaft 52 to rotate at a constant speed through the torque limiting clutch 53, and the eccentrically set indexing block 54 enters the indexing drive groove 55, pushing the indexing plate body 21 to rotate around the central axis; when the shift fork shaft 52 rotates 180°, the indexing block 54 pushes the indexing plate body 21 to rotate one station (the specific angle is determined according to the number of stations), at which point the indexing block 54 rotates out of the indexing drive groove 55, completing the indexing action.

[0051] Step 2, Positioning and Locking: When the indexing plate body 21 rotates to the target position, the disc cam 423 rotates to the return section, and the thrust on the L-shaped lever arm 431 disappears; the stretched compression spring 32 quickly resets, pushing the positioning pin 33 upward to accurately insert into the next precision positioning pin hole 22, and the stroke limit boss 34 once again fits against the lower end face of the indexing guide plate 13, completing the circumferential rigid locking of the indexing plate body.

[0052] Step 3, synchronous processing: The output shaft of the high-precision servo motor 41 simultaneously drives the coaxially fixed cam lifting column 61 to rotate, and the sinusoidal guide groove 62 on its outer circumference enters the lifting section; the guide groove pushes the three evenly arranged cam follower blocks 64 to move synchronously upward or downward, driving the tooling lifting column 63 to rise or fall, and the processing equipment on the tooling lifting column 63 moves to the surface to be processed of the workpiece for fine processing, and resets and detaches from the workpiece after processing, realizing synchronous avoidance.

[0053] Step 4, Release the limit: The output shaft of the high-precision servo motor 41 drives the drive gear 421 to rotate at a constant speed, and drives the driven gear 422 to rotate synchronously with a set reduction ratio through external meshing transmission; the disc cam 423, which is fixed coaxially with the driven gear 422, enters the lift section, and its contour surface pushes the lower end of the left L-shaped lever arm 431 to rotate outward around the hinge point; the left lever arm drives the right L-shaped lever arm 431 to rotate synchronously in the opposite direction through the synchronous connecting rod 44, ensuring that the rotation angles of the two sets of lever arms are completely consistent; the upper ends of the two lever arms simultaneously pull down the corresponding drive rod 31, compressing the compression spring 32, so that the two positioning pins 33 are completely pulled out of the precision positioning pin hole 22 at the same time, releasing the circumferential limit on the indexing plate body 21.

[0054] The high-precision servo motor 41 rotates continuously at a constant speed, repeating the work of steps one to four above, to realize the continuous intermittent indexing and positioning of the indexing plate body 21, and completes a complete processing cycle with each rotation.

[0055] In this embodiment, the high-precision servo motor 41 maintains a constant speed rotation without the need for starting, stopping, or speed adjustment; the speed only needs to be set once when changing products. With each rotation, the device automatically completes a full work cycle, enabling continuous, uninterrupted multi-station automated production.

[0056] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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 invention.

[0057] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0058] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A precision positioning mechanism, characterized in that, include: The indexing plate assembly is rotatably mounted on the frame assembly and has a hollow center. An elastic positioning pin assembly is vertically slidably disposed on the frame assembly. The elastic positioning pin assembly can be intermittently inserted into the indexing plate assembly to provide circumferential rigidity limiting for the indexing plate assembly. as well as A single servo cam drive system is mounted on a frame assembly. The single servo cam drive system is connected to the elastic positioning pin assembly and is used to drive the elastic positioning pin assembly to slide back and forth in the vertical direction.

2. The precision positioning mechanism according to claim 1, characterized in that, The rack assembly includes: A double-layer base, consisting of two interconnected layers; A hollow support shaft, which is a hollow tubular structure, is coaxially connected to the upper center of the double-layer base; and The indexing guide disc is a hollow disc-shaped structure and is coaxially connected to the upper end of the hollow support shaft.

3. The precision positioning mechanism according to claim 2, characterized in that, The indexing plate assembly includes an indexing plate body rotatably fitted around the outer periphery of the indexing guide plate. The indexing plate body has multiple sets of precision positioning pin holes and multiple sets of tooling mounting holes coaxially opened from the inside to the outside with its center as the center. The precision positioning pin holes and tooling mounting holes are all evenly spaced along the circumference of the indexing plate body.

4. The precision positioning mechanism according to claim 3, characterized in that, The elastic positioning pin assembly includes a drive rod, a compression spring, and a positioning pin arranged coaxially from bottom to top. The upper end of the compression spring is mounted on the frame assembly and connected to the drive rod, and is used to apply an upward elastic force to the positioning pin, while also having an automatic positioning wear compensation function. The upper end of the positioning pin is matched and inserted into the precision positioning pin hole; The upper sidewall of the positioning pin is provided with a travel limiting boss, and the upper end face of the travel limiting boss intermittently abuts against the lower end face of the indexing guide plate to limit the upward limit travel of the positioning pin.

5. A precision positioning mechanism according to claim 4, characterized in that, The single servo cam drive system includes: A high-precision servo motor is fixedly installed on the upper layer of the double-layer base. The output axis of the high-precision servo motor extends upward and is eccentrically positioned in the hollow area of ​​the indexing plate body. A gear transmission unit includes a driving gear that is synchronously driven with the output shaft of the high-precision servo motor, a driven gear that meshes externally with the driving gear and is rotatably disposed on the upper layer of the double-layer base, and a disc-shaped cam that is coaxially fixedly connected to the driven gear and rotates synchronously; and The lever transmission mechanism includes an L-shaped lever arm rotatably mounted on the double-layer base. The lower end of the lever arm intermittently abuts against the disc cam, and its upper end is hinged to the lower end of the drive rod.

6. A precision positioning mechanism according to claim 5, characterized in that, Both the elastic positioning pin assembly and the lever transmission mechanism are provided in two sets. The two sets of gear transmission units are symmetrically arranged at the center of the indexing plate body; The lower ends of the lever arms of the two sets of lever transmission mechanisms are connected by a synchronous connecting rod.

7. A multi-station indexing control system, characterized in that, The precise positioning mechanism described in any one of claims 1-6 is adopted.

8. A multi-station indexing control system according to claim 7, characterized in that, It also includes a grooved wheel type indexing fork mechanism for rotating the indexing plate body, which includes: A shift fork support seat, which is mounted on the indexing guide plate; A shift fork shaft passes through the shift fork support and is rotatably mounted on the shift fork support. The lower end of the shift fork shaft is synchronously driven with the drive shaft of the driven gear through a torque limiting clutch. Indexing block, which is eccentrically disposed at the upper end of the fork shaft; and Multiple indexing drive slots are evenly spaced along the circumference on the inner sidewall of the indexing plate body. The indexing block can rotate with the fork shaft and enter the indexing drive slot to drive the indexing plate body to rotate one position.

9. A multi-station indexing control system according to claim 7, characterized in that, The output shaft of the high-precision servo motor is coaxially connected to a cam lifting column, and a sinusoidal guide groove is provided on the outer circumferential surface of the cam lifting column.

10. A multi-station indexing control system according to claim 9, characterized in that, The indexing guide plate is elastically provided with a tooling lifting column, and a cam follower block that matches the sinusoidal guide groove is connected to the tooling lifting column.

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