A quick clamping device for grinding machines

Abstract

This utility model relates to the field of machining technology, specifically a rapid clamping device for a grinding machine. It includes a base and multiple external clamping bodies. The base includes a positioning plate and zero-point positioning pins at both ends. The top surface of each external clamping body uses a powerful permanent magnet to attract the workpiece, and the bottom surface is equipped with a suitable zero-point positioning sleeve. Precise positioning is achieved through conical surface mating. This utility model enables rapid clamping, precise positioning, and flexible adaptation, improving machining efficiency and quality.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically a quick clamping device for a grinding machine. Background Technology

[0002] In grinding machine processing, the workpiece clamping efficiency and positioning accuracy directly determine the production pace and machining quality. Current grinding machine clamping methods suffer from the following significant problems, making it difficult to meet the demands of high-precision and high-efficiency production:

[0003] Traditional grinding machine clamping relies heavily on manual tightening or single mechanical clamping structures. The clamping process requires machine downtime and lacks standardized positioning references, with each clamping session taking 3-5 minutes. This results in an effective machine utilization rate of less than 60%, severely hindering mass production. While some automated grinding machines are equipped with pneumatic clamping devices, the positioning structure and clamping mechanism are designed separately. Repeated clamping sessions suffer from inconsistent references, leading to positioning deviations of 0.01-0.03 mm. Accumulated errors result in poor workpiece dimensional consistency and a high scrap rate.

[0004] The clamping process lacks precise guidance and a proper positioning detection mechanism: operators need to repeatedly adjust the workpiece position to align with the machining datum, which is cumbersome and relies heavily on experience; whether the clamping is in place can only be judged visually, and cannot be confirmed by quantitative means, which can easily lead to machining abnormalities due to misjudgment. At the same time, iron filings and residual coolant generated during machining tend to accumulate on the mating surfaces of the positioning holes and positioning pins, which not only increases clamping resistance but also causes the positioning datum to shift, and the quality risk of iron filings scratching the workpiece surface is prominent. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the deficiencies in the existing technology, this utility model aims to solve the following problems or one of them:

[0007] 1. The clamping process relies on manual operation or a separate clamping structure, and the downtime for a single clamping operation can be as long as 3-5 minutes, resulting in an effective operating rate of less than 60% for the equipment, which restricts the efficiency of mass production.

[0008] 2. The positioning structure and clamping mechanism are designed separately. When clamping repeatedly, the positioning deviation reaches 0.01-0.03mm. The cumulative error causes poor consistency of the workpiece machining dimensions and affects the stability of machining quality.

[0009] 3. The lack of a pre-positioning guide structure and a chip removal mechanism requires repeated adjustments to the workpiece position during operation, and the accumulation of chips on the positioning mating surface can easily cause positioning datum offset and workpiece surface scratches.

[0010] 4. The fixture and workpiece have limited compatibility. Changing to different workpiece specifications requires replacing the entire positioning assembly, with a changeover time of more than 20 minutes. Furthermore, it lacks a collaborative positioning structure with automated robotic arms, which cannot meet the flexible production needs of multiple varieties and small batches.

[0011] (II) Technical Solution

[0012] To address the aforementioned problems, this utility model provides a quick clamping device for a grinding machine, comprising a base, a clamping body, a positioning assembly, a clamping assembly, a chip removal assembly, and a control system, the specific structure of which is as follows:

[0013] A quick clamping device for a grinding machine includes a base that can be fixed on the worktable of the grinding machine. The base includes a positioning plate at the top, with zero-point positioning pins installed at both ends near the positioning plate. It also includes multiple external clamping bodies, each comprising an external clamping plate. The top surface of each external clamping plate is embedded with multiple powerful permanent magnets for adsorbing multiple workpieces, and the bottom surface is embedded with zero-point positioning sleeves adapted to the zero-point positioning pins.

[0014] Furthermore, the zero-point positioning pin includes a conical convex section with a smaller upper part and a frustum section with a larger lower part, and correspondingly, the zero-point positioning sleeve has a conical concave section with a larger lower part and a smaller upper part that is adapted to the conical convex section; the positioning plate is fixed on the base plate, and circular holes with clearance fits between the two ends of the positioning plate and the frustum section are respectively opened, and the spring is located in the circular hole, with the two ends abutting against the base plate and the bottom surface of the zero-point positioning pin respectively; the frustum section is cut downward along the axial direction to form a limiting surface, and a limiting plate is fixed on the positioning plate, and the limiting plate abuts against the limiting surface to prevent the zero-point positioning pin from coming out of the circular hole.

[0015] Furthermore, the zero-point positioning pin has an axially vented hole at its center, and the top of the zero-point positioning sleeve is closed; the base plate has an air passage connected to the circular hole, the air passage is connected to the high-pressure air circuit and is equipped with a pressure sensor or pressure gauge and a solenoid valve that controls the opening and closing of the high-pressure air circuit.

[0016] Furthermore, when the zero-point positioning pin is about to enter but has not yet entered the zero-point positioning sleeve, the solenoid valve is activated for 0.5-2 seconds to remove the wear debris and residual liquid between the machine's external clamp and the positioning plate.

[0017] Furthermore, the air passage includes a main air passage and a branch air passage. The main air passage extends along the length of the substrate, with one end connected to a quick-connect fitting and the other end screwed into a sealing plug for sealing. The inner end of the branch air passage is connected to the main air passage, the middle part passes through the circular hole, and the outer end opens to the side of the substrate and is screwed into a sealing plug for sealing.

[0018] Furthermore, a groove is formed on the positioning plate that intersects with the circular hole, the limiting plate is fixed in the groove, and the upper surface of the limiting plate does not extend beyond the upper surface of the positioning plate.

[0019] Furthermore, the base is fixed with cylinders for two rotating electromagnets, and a pressure plate is fixedly connected to the output shaft of the rotating electromagnet. The rotation center of the pressure plate coincides with the axis of the output shaft. The rotating electromagnet is configured to drive the pressure plate to reciprocate around the axis of the output shaft from 0 to 90°, so that the free end of the pressure plate switches between a first position pressing against the external clamping body and a second position disengaging from the external clamping body. The free end of the pressure plate is provided with a pressing part that contacts the top surface of the external clamping body. The bottom surface of the pressing part is a planar structure and parallel to the clamping plane of the external clamping body.

[0020] Furthermore, a self-testing unit is fixedly mounted on the base. The self-testing unit includes a bracket fixed to the side of the base, a thickness detection component, a flatness detection component, and / or a surface roughness detection component mounted on the bracket. The self-testing unit integrates a data processing module, which is electrically connected to the thickness detection component, the flatness detection component, and / or the surface roughness detection component, and the driving mechanism, and has built-in thickness tolerance thresholds, flatness tolerance thresholds, and / or surface roughness standard values ​​and a database. A signal interface is provided on the base corresponding to the position of the self-testing unit, and the signal interface is connected to the data processing module via a wire.

[0021] Furthermore, each end of the external clamping body is embedded with an induction chip; the induction chip includes a coil winding for generating an electromagnetic field of a specific frequency and a memory circuit for storing clamping type information, the frequency of the electromagnetic field corresponding one-to-one with the clamping type; the front end of the grinding machine's robot arm is equipped with an electromagnetic field sensor and a signal processor, the electromagnetic field sensor for receiving the electromagnetic field signal generated by the induction chip, and the signal processor for analyzing the frequency characteristics of the electromagnetic field signal and identifying the corresponding clamping type; both the electromagnetic field sensor and the signal processor are electrically connected to the robot arm's control system, the control system being configured to adjust the robot arm's gripping path parameters according to the identified clamping type.

[0022] Furthermore, the positioning plate has a dumbbell-shaped structure, including rectangular heads at both ends and a rectangular waist connecting the two heads. The zero-point positioning pins are respectively installed at the center of the rectangular heads. The lower surface of the external clamping plate is fixed with two side strips and two end strips. The side strips have a contoured structure that matches the outer contour of the positioning plate. The two ends of the side strips form outwardly convex rectangular segments corresponding to the positions of the rectangular heads, and the middle part forms a straight segment corresponding to the position of the rectangular waist. The end strips are straight and are respectively connected between the ends of the two side strips. The side strips and end strips together form a frame that conforms to the shape of the positioning plate. A gap of 0.5-1.0mm is reserved between the inner contour of the frame and the outer contour of the positioning plate. The thickness of the side strips and end strips is equal to or slightly greater than the thickness of the positioning plate.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Significantly improve clamping efficiency: By cooperating with the zero-point positioning pin sleeve of the positioning plate and the pressure plate quick clamping structure driven by the rotating electromagnet, the coordination of external pre-positioning and internal quick locking is realized. The single clamping time is shortened from 3-5 minutes to less than 30 seconds, the effective working rate of the machine tool is increased to more than 85%, and the downtime waiting time is greatly reduced.

[0026] 2. Improved repeatability: The rigid fit between the convex and concave sections of the cone, combined with airtightness verification through air pressure testing, controls the repeatability deviation to within 0.005mm, which is more than 60% lower than the 0.01-0.03mm of the existing technology; the buffer design of the spring and limit structure reduces clamping impact, ensures consistent machining dimensions, and reduces the scrap rate to below 0.5%.

[0027] 3. Enhanced operational reliability and cleanliness: The high-pressure purging structure of the branch air duct automatically removes iron filings and residual liquid before clamping. Combined with the contour protection of the edge and end bars, it avoids scratches on the positioning surface, reducing workpiece surface quality defects by 90%. The flush design of the limiting plate in the settling tank eliminates operational interference and reduces reliance on manual experience.

[0028] 4. Enhance the adaptability of flexible production: The electromagnetic field sensing of the sensing chip and the robot arm work together to realize automatic identification of fixture type. With the help of the standardized zero-point positioning system, the changeover time is shortened from 20-30 minutes to less than 5 minutes, and it can be compatible with the rapid switching of 8-10 different specifications of workpieces. The integration of the self-inspection unit and the signal interface supports closed-loop control of processing-inspection-correction, which can adapt to the needs of multi-variety small-batch production.

[0029] 5. Advantages of structural integration: Positioning, clamping, cleaning, and detection functions are modularly integrated through the base plate and bracket, reducing the number of independent parts by more than 40% and lowering equipment maintenance costs; the parametric design of each structural unit ensures functional stability and extends the mean time between failures to more than 800 hours. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 This is a schematic diagram of the structure of the base of this utility model.

[0032] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0033] Figure 4 This is a schematic diagram of the specific structure of the external clamp of this utility model. Detailed Implementation

[0034] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 utility model and simplifying the description, and do not indicate or imply that the device or element 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 this utility model.

[0035] 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.

[0036] 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.

[0037] like Figure 1-4As shown, a quick clamping device for a grinding machine includes a base 1 that can be fixed on the worktable of the grinding machine. The base 1 includes a positioning plate 11 at the top and zero-point positioning pins 12 installed at both ends near the positioning plate 11. It also includes multiple external clamping bodies 2. Each external clamping body 2 includes an external clamping plate 21. The top surface of the external clamping plate 21 is embedded with multiple strong permanent magnets for adsorbing multiple workpieces 100, and the bottom surface is embedded with a zero-point positioning sleeve 22 that is compatible with the zero-point positioning pins 12.

[0038] Specifically, the zero-point positioning pin 12 includes a conical convex section 121 with a smaller upper part and a frustum section 122, and correspondingly, the zero-point positioning sleeve 22 has a conical concave section with a larger lower part and a smaller upper part that is adapted to the conical convex section 121; the positioning plate 11 is fixed on the base plate 13, and the two ends of the positioning plate 11 are respectively provided with circular holes 111 that are clearance-fitted with the frustum section 122; the spring 14 is located in the circular holes 111, and the two ends abut against the base plate 13 and the bottom surface of the zero-point positioning pin 12, respectively; the frustum section 122 is cut downward along the axial direction to form a limiting surface 123, and a limiting plate 15 is fixed on the positioning plate 11; the limiting plate 15 abuts against the limiting surface 123 to prevent the zero-point positioning pin 12 from coming out of the circular hole 111.

[0039] The working principle of this embodiment is as follows:

[0040] 1. Pre-fixing of workpiece: The workpiece 100 is fixed by the strong permanent magnet embedded on the top surface of the external clamping plate 21, so as to realize the initial positioning of the workpiece on the external clamping body 2 and ensure the stability of the relative position of the workpiece and the external clamping plate 21.

[0041] 2. Positioning, Alignment, and Fitting: When the external clamping body 2 and the base body 1 are clamped, the zero-point positioning sleeve 22 on the bottom surface of the external clamping plate 21 is aligned with the zero-point positioning pins 12 at both ends of the positioning plate 11. The conical convex section 121 of the zero-point positioning pin 12 is fitted with the conical concave section of the zero-point positioning sleeve 22, utilizing the self-centering characteristic of the conical surface to achieve precise positioning of the external clamping body 2 and the base body 1, ensuring repeatability accuracy.

[0042] 3. Elastic support and buffer: The two ends of the spring 14 in the round hole 111 of the positioning plate 11 abut against the bottom surface of the base plate 13 and the zero-point positioning pin 12 respectively. During the clamping process, when the zero-point positioning pin 12 is subjected to the pressure of the machine external clamping body 2, the spring 14 is compressed, which provides buffer for positioning and avoids rigid impact. When not clamped, the elastic force of the spring 14 keeps the zero-point positioning pin 12 in the extended state, which facilitates the alignment of the positioning sleeve 22.

[0043] 4. Structural limit protection: The limiting surface 123 of the frustum section 122 of the zero-point positioning pin 12 abuts against the limiting plate 15 on the positioning plate 11, limiting the axial displacement of the zero-point positioning pin 12 and preventing it from coming out of the round hole 111, ensuring the stability of the positioning pin structure and ensuring the safety and reliability of the clamping process.

[0044] Through the above-mentioned structural coordination, a stable connection is achieved from the pre-fixation of the workpiece outside the machine to the precise clamping with the base, taking into account both positioning accuracy and operational stability.

[0045] In another preferred embodiment, the zero-point positioning pin 12 has an axially oriented vent hole 124 at its center, and the top of the zero-point positioning sleeve 22 is closed. An air passage communicating with the circular hole 111 is provided within the base plate 13. This air passage is connected to a high-pressure air circuit and is equipped with a pressure sensor or pressure gauge and a solenoid valve controlling the on / off state of the high-pressure air circuit. Through the vent hole of the zero-point positioning pin, the top-closed zero-point positioning sleeve, and the air passage with the pressure sensor / solenoid valve within the base plate, changes in air pressure can be used to detect whether the clamping is in place in real time, accurately identifying cases of false clamping or mis-clamping, significantly improving clamping reliability and avoiding machining errors caused by inaccurate positioning.

[0046] In another preferred embodiment, when the zero-point positioning pin 12 is about to enter but has not yet entered the zero-point positioning sleeve 22, the solenoid valve is activated for 0.5-2 seconds to remove wear debris and residual fluid between the external clamping body 2 and the positioning plate 11. This effectively cleans the positioning surface and the mating clearance, reduces the interference of impurities on the positioning accuracy, prevents iron filings from scratching the workpiece surface, reduces quality risks, and ensures the stability of subsequent clamping.

[0047] In another preferred embodiment, the air passage includes a main air passage and branch air passages. The main air passage extends along the length of the substrate 13, with one end connected to a quick-connect fitting and the other end screwed into a sealing plug for sealing. The branch air passage connects to the main air passage at its inner end, passes through the circular hole 111 in its middle, and opens at the side of the substrate 13 at its outer end, where it is also screwed into a sealing plug for sealing. Both the main air passage and the branch air passage are straight-line channel structures, conforming to the conventional machining process of "drilling first and then sealing"—the main air passage can be formed by drilling along the length of the substrate, and the branch air passage can be formed by drilling perpendicular to the direction of the main air passage. The machining path is simple, eliminating the need for complex curved surface or cross-hole machining, thus reducing machining difficulty. The quick-connect fitting facilitates rapid connection and maintenance of the high-pressure air circuit, and the sealing plug ensures the accuracy of air pressure detection, improving the overall stability and practicality of the air pressure system.

[0048] In another preferred embodiment, a recess 112 intersecting the circular hole 111 is formed on the positioning plate 11. The limiting plate 15 is fixed within the recess 112, and the upper surface of the limiting plate 15 does not extend beyond the upper surface of the positioning plate 11. This avoids the limiting plate protruding and interfering with the clamping process of the external clamping device, reduces collision and wear between structures, and at the same time, the recess protects the limiting plate, extends its service life, and ensures the long-term reliability of the limiting function.

[0049] In another preferred embodiment, the base 1 is fixed with cylinders for two rotating electromagnets 3. A pressure plate 4 is fixed to the output shaft of each rotating electromagnet 3, and the rotation center of the pressure plate 4 coincides with the axis of the output shaft. The rotating electromagnets 3 are configured to drive the pressure plate 4 to reciprocate around the axis of the output shaft from 0 to 90 degrees, so that the free end of the pressure plate 4 switches between a first position pressing against the external clamping body 2 and a second position disengaging from the external clamping body 2. The free end of the pressure plate 4 has a pressing part that contacts the top surface of the external clamping body 2. The bottom surface of the pressing part is planar and parallel to the clamping plane of the external clamping body 2. The rotating electromagnets drive the pressure plate to reciprocate from 0 to 90 degrees, achieving rapid pressing and releasing of the external clamping body, significantly shortening the clamping auxiliary time. The planar pressing part is parallel to the clamping plane, ensuring uniform distribution of the pressing force and preventing deformation of the workpiece due to excessive local force, thus balancing clamping efficiency and workpiece stability.

[0050] In another preferred embodiment, a self-testing unit 5 is fixedly mounted on the base 1. The self-testing unit 5 includes a bracket fixed to the side of the base 1, a thickness detection component, a flatness detection component, and / or a surface roughness detection component mounted on the bracket. The self-testing unit 5 integrates a data processing module, which is electrically connected to the thickness detection component, the flatness detection component, and / or the surface roughness detection component, and the driving mechanism. The data processing module also contains built-in thickness tolerance thresholds, flatness tolerance thresholds, and / or surface roughness standard values ​​and a database. A signal interface is provided on the base 1 corresponding to the position of the self-testing unit 5, and the signal interface is connected to the data processing module via a wire. The terms "thickness detection component, flatness detection component, and / or surface roughness detection component" mean that the thickness detection component is a mandatory core detection component in the self-testing unit 5, while the flatness detection component and the surface roughness detection component are optional additional components that can be selected for configuration based on actual testing needs. This embodiment allows for the retention of only the thickness detection component, or the addition of one or both of the flatness and surface roughness detection components to the thickness detection component. The advantage of this embodiment is that making the thickness detection component a mandatory configuration ensures stable performance in meeting the critical requirement of workpiece thickness detection, making it particularly suitable for precision grinding scenarios with high thickness accuracy requirements, thus avoiding processing waste due to thickness deviations. The optional configuration of the flatness and surface roughness detection components allows for flexible combinations based on different workpiece needs, satisfying diverse detection requirements while avoiding unnecessary cost increases and structural redundancy. The data processing module integrates a relevant tolerance threshold database, combined with the drive mechanism and signal interface, enabling real-time processing and feedback of detection data, supporting closed-loop control of machining-detection-correction, and improving the timeliness and accuracy of quality control. Furthermore, the design of mandatory core components and optional additional components allows the self-inspection unit to adapt to the flexible production needs of multiple varieties and small batches, suitable for various workpiece detection scenarios with strict thickness requirements but different flatness / roughness requirements.

[0051] In another preferred embodiment, induction chips are embedded at both ends of the external clamping body. Each induction chip includes a coil winding for generating an electromagnetic field of a specific frequency and a memory circuit for storing clamping type information. The frequency of the electromagnetic field corresponds one-to-one with the clamping type. The front end of the grinding machine's robotic arm is equipped with an electromagnetic field sensor and a signal processor. The electromagnetic field sensor receives the electromagnetic field signal generated by the induction chip, and the signal processor analyzes the frequency characteristics of the electromagnetic field signal and identifies the corresponding clamping type. Both the electromagnetic field sensor and the signal processor are electrically connected to the robotic arm's control system, which is configured to adjust the robotic arm's gripping path parameters according to the identified clamping type. By cooperating with the induction chip of the external clamping body and the robotic arm's electromagnetic field sensor and signal processor, the clamping type can be automatically identified and the gripping path adjusted, enabling rapid switching between different clamping specifications, reducing changeover time, adapting to the flexible production needs of multiple varieties and small batches, and reducing reliance on manual operating experience.

[0052] In another preferred embodiment, the positioning plate 11 has a dumbbell-shaped structure, including rectangular heads at both ends and a rectangular waist connecting the two heads. The zero-point positioning pins 12 are respectively installed at the center of the rectangular heads. The lower surface of the external clamping plate 21 is fixed with two side strips 23 and two end strips 24. The side strips 23 have a contoured structure that matches the outer contour of the positioning plate 11. The two ends of the side strips 23 form outwardly protruding rectangular segments corresponding to the positions of the rectangular heads, and the middle part forms a straight segment corresponding to the position of the rectangular waist. The end strips 24 are straight and are respectively connected between the ends of the two side strips 23. The side strips 23 and end strips 24 together form a frame that conforms to the shape of the positioning plate 11. A gap of 0.5-1.0 mm is reserved between the inner contour of the frame and the outer contour of the positioning plate 11. The thickness of the side strips 23 and end strips 24 is equal to or slightly greater than the thickness of the positioning plate 11. The dumbbell-shaped structure of the positioning plate cooperates with the contoured edge strips and end strips frame on the lower surface of the external clamping plate. The 0.5-1.0mm gap reserved in the frame can guide the clamping and positioning, avoiding misalignment. The thickness design of the edge strips and end strips can protect the surface of the positioning plate, reduce the entry of impurities such as iron filings into the positioning area, and enhance the guiding performance of the external clamping body in cooperation with the positioning plate, thereby improving the repeatability of positioning accuracy.

[0053] 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 quick clamping device for a grinding machine, comprising a base (1) that can be fixedly mounted on the worktable of the grinding machine, characterized in that, The base (1) includes a positioning plate (11) at the top, and zero-point positioning pins (12) are installed at both ends near the positioning plate (11); it also includes multiple external clamping bodies (2), each external clamping body (2) includes an external clamping plate (21), the top surface of the external clamping plate (21) is embedded with multiple powerful permanent magnets for adsorbing multiple workpieces (100), and the bottom surface is embedded with a zero-point positioning sleeve (22) that is compatible with the zero-point positioning pins (12).

2. A quick clamping device for a grinding machine as claimed in claim 1, wherein, The zero-point positioning pin (12) includes a conical convex section (121) with a smaller upper part and a frustum section (122) with a larger lower part. Correspondingly, the zero-point positioning sleeve (22) has a conical concave section with a larger lower part and a smaller upper part that is adapted to the conical convex section (121). The positioning plate (11) is fixed on the base plate (13). The two ends of the positioning plate (11) are respectively opened with circular holes (111) that are clearance-fitted with the frustum section (122). The spring (14) is located in the circular hole (111) and its two ends abut against the base plate (13) and the bottom surface of the zero-point positioning pin (12) respectively. The frustum section (122) is cut downward along the axial direction to form a limiting surface (123). A limiting plate (15) is fixed on the positioning plate (11). The limiting plate (15) abuts against the limiting surface (123) to prevent the zero-point positioning pin (12) from coming out of the circular hole (111).

3. A quick clamping device for a grinding machine as claimed in claim 2, wherein, The zero-point positioning pin (12) has an axially vent hole (124) at its center, and the top of the zero-point positioning sleeve (22) is closed. The base plate (13) has an air passage that communicates with the circular hole (111). The air passage is connected to the high-pressure air circuit and is equipped with a pressure sensor or pressure gauge and a solenoid valve that controls the opening and closing of the high-pressure air circuit.

4. A quick clamping device for a grinding machine as claimed in claim 3, wherein, When the zero-point positioning pin (12) is about to enter but has not yet entered the zero-point positioning sleeve (22), the solenoid valve is turned on for 0.5-2 seconds to remove the wear debris and residual liquid between the machine external clamp (2) and the positioning plate (11).

5. The quick clamping device of claim 3, wherein The air passage includes a main air passage and a branch air passage. The main air passage extends along the length of the substrate (13), with one end connected to a quick-connect fitting and the other end screwed into a sealing plug for sealing. The inner end of the branch air passage is connected to the main air passage, the middle part passes through the circular hole (111), and the outer end opens to the side of the substrate (13) and is screwed into a sealing plug for sealing.

6. A quick clamping device for a grinding machine according to claim 2, characterized in that, The positioning plate (11) has a groove (112) that intersects with the circular hole (111), the limiting plate (15) is fixed in the groove (112), and the upper surface of the limiting plate (15) does not extend beyond the upper surface of the positioning plate (11).

7. The quick clamping device of claim 1, wherein, The base (1) is fixed with cylinders for two rotating electromagnets (3). A pressure plate (4) is fixed to the output shaft of the rotating electromagnet (3). The rotation center of the pressure plate (4) coincides with the axis of the output shaft. The rotating electromagnet (3) is configured to drive the pressure plate (4) to reciprocate around the axis of the output shaft from 0 to 90°, so that the free end of the pressure plate (4) switches between a first position pressing the external clamping body (2) and a second position disengaging from the external clamping body (2). The free end of the pressure plate (4) is provided with a pressing part that contacts the top surface of the external clamping body (2). The bottom surface of the pressing part is a planar structure and parallel to the clamping plane of the external clamping body (2).

8. The quick clamping device of claim 1, wherein, A self-testing unit (5) is fixed on the seat (1). The self-testing unit (5) includes a bracket fixed to the side of the seat (1), a thickness detection component, a flatness detection component and / or a surface roughness detection component installed on the bracket. The self-testing unit (5) integrates a data processing module. The data processing module is electrically connected to the thickness detection component, the flatness detection component and / or the surface roughness detection component and the driving mechanism, and has built-in thickness tolerance threshold, flatness tolerance threshold and / or surface roughness standard value and database. A signal interface is opened on the seat (1) at the position corresponding to the self-testing unit (5). The signal interface is connected to the data processing module through a wire.

9. The quick clamping device of claim 1, wherein, The external clamping device has induction chips embedded at both ends. Each induction chip includes a coil winding for generating an electromagnetic field of a specific frequency and a memory circuit for storing clamping type information. The frequency of the electromagnetic field corresponds one-to-one with the clamping type. The front end of the grinding machine's robot arm is equipped with an electromagnetic field sensor and a signal processor. The electromagnetic field sensor receives the electromagnetic field signal generated by the induction chip, and the signal processor analyzes the frequency characteristics of the electromagnetic field signal and identifies the corresponding clamping type. Both the electromagnetic field sensor and the signal processor are electrically connected to the robot arm's control system, which is configured to adjust the robot arm's gripping path parameters according to the identified clamping type.

10. The quick clamping device of claim 1, wherein, The positioning plate (11) has a dumbbell-shaped structure, including rectangular heads at both ends and a rectangular waist connecting the two heads. The zero-point positioning pin (12) is installed at the center of the rectangular head. The lower surface of the external clamp plate (21) is fixed with two side strips (23) and two end strips (24). The side strips (23) have a contour-following structure that matches the outer contour of the positioning plate (11). The two ends of the side strips (23) form outwardly protruding rectangular segments corresponding to the positions of the rectangular heads, and the middle part forms a straight segment corresponding to the position of the rectangular waist. The end strips (24) are straight and are connected between the ends of the two side strips (23). The side strips (23) and end strips (24) together form a frame that conforms to the shape of the positioning plate (11). The inner contour of the frame and the outer contour of the positioning plate (11) are reserved with a gap of 0.5-1.0 mm. The thickness of the side strips (23) and end strips (24) is equal to or slightly greater than the thickness of the positioning plate (11).

Images