Electromagnetic quick-change device for grinding wheel

Abstract

This utility model discloses an electromagnetic quick-change device for grinding wheels, including a grinding wheel shaft, a grinding wheel flange seat, an inner grinding wheel clamp, and a grinding wheel mounting plate. At least two connecting pins with locking grooves at their extended ends are fixed to the upper end of the grinding wheel mounting plate. The grinding wheel flange seat has connecting pin holes corresponding to the connecting pins. A radially movable locking plate is provided on the upper end face of the flange edge of the grinding wheel flange seat, with pin insertion holes on the locking plate. The upper end of the connecting pin passes through the corresponding pin insertion hole, and the connecting pin can be engaged with the movable locking plate through the locking groove. A coil is provided inside the grinding wheel flange seat, embedded in an annular groove. The grinding wheel shaft is a hollow shaft, and the coil lead passes through the inner hole of the hollow grinding wheel shaft and is connected to a power source through a conductive slip ring installed at the other end of the grinding wheel shaft. The electromagnetic quick-change device of this utility model enables convenient installation and disassembly of the grinding wheel and provides a reliable and stable fixed connection.

Description

Technical Field

[0001] This utility model relates to a machine tool accessory, and more particularly to a quick-installation structure for a grinding wheel used in a grinding machine. Background Technology

[0002] Grinding machines grind the surface of workpieces using rotating grinding wheels. Different types of grinding wheels are required depending on the material, surface hardness, and process requirements of the material being ground. The grinding wheels must be replaced after they wear down to a certain extent. This means that grinding wheels on grinding machines often need to be installed and removed. In grinding machines that grind flat straight cutters, the grinding wheel is usually fixed to the connecting flange at the end of the grinding head spindle by bolts through the grinding wheel disc. The installation and removal process requires loosening or tightening each bolt in a certain order. This installation and removal process consumes a lot of time and affects the working efficiency of the grinding machine. Utility model patent CN219359135U discloses a quick-change structure for grinding wheels in a grinding head. It uses a dedicated permanent magnet chuck mounted on the grinding head spindle to hold the inserted grinding wheel, thus securing the grinding wheel to the spindle. The permanent magnet chuck has circumferentially spaced magnetic protrusions on its body, and an annular permanent magnet disk is fitted onto the disk body. The annular permanent magnet disk has circumferentially spaced magnetic pole protrusions. When the annular permanent magnet disk is rotated so that the magnetic protrusions circumferentially overlap with the magnetic pole protrusions, adjacent magnetic pole protrusions with opposite polarities on the annular permanent magnet disk can form a closed magnetic circuit through the magnetic protrusions on the disk body and the iron grinding wheel fixed to the grinding wheel. This generates a corresponding attraction force on the grinding wheel, firmly holding it in place. Conversely, the magnetic circuit is broken, the attraction force disappears, and the grinding wheel is released. This structure allows for quick installation or removal of the grinding wheel, but the suction force becomes unstable after use. This is related to factors such as manufacturing precision and the quality of the permanent magnet material used. Such a technical solution cannot guarantee stable and reliable use. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide an electromagnetic quick-change device for grinding wheels, which can make the installation and disassembly of grinding wheels convenient and obtain a reliable and stable fixed connection.

[0004] To solve the above-mentioned technical problems, this utility model provides an electromagnetic quick-change device for grinding wheels, including a grinding wheel shaft, a grinding wheel flange seat installed at one end of the grinding wheel shaft, an inner grinding wheel chuck and a grinding wheel mounting plate for clamping the grinding wheel, at least two connecting pins fixedly provided on the upper end of the grinding wheel mounting plate, the extended ends of the connecting pins having snap-fit ​​grooves, connecting pin holes corresponding to the connecting pins being provided on the grinding wheel flange seat, a snap-fit ​​plate that can move radially along the grinding wheel flange seat being provided on the upper end surface of the flange edge, a pin insertion hole corresponding to the connecting pin being provided on the snap-fit ​​plate, the upper end of the connecting pin passing through the pin insertion hole, the thickness of the snap-fit ​​plate corresponding to the width of the snap-fit ​​groove, the connecting pin being snapped with the movable snap-fit ​​plate through the snap-fit ​​groove; a coil is provided inside the grinding wheel flange seat, the coil being embedded in the annular groove of the grinding wheel flange seat; the grinding wheel shaft is a hollow shaft, the lead wire of the coil passing through the inner hole of the hollow grinding wheel shaft and connected to a power source through a conductive slip ring installed at the other end of the grinding wheel shaft.

[0005] In the above structure, at least two connecting pins are fixedly mounted on the upper end of the grinding wheel mounting disc. The extended ends of the connecting pins have snap-fit ​​grooves. The grinding wheel flange seat has connecting pin holes corresponding to the connecting pins. A snap-fit ​​plate, which can move radially along the grinding wheel flange seat, is provided on the upper end face of the flange edge. The snap-fit ​​plate has pin insertion holes corresponding to the connecting pins. The upper end of the connecting pin passes through the pin insertion holes. The thickness of the snap-fit ​​plate corresponds to the width of the snap-fit ​​groove. The connecting pin can snap into the movable snap-fit ​​plate through the snap-fit ​​groove. Therefore, the connecting pins on the grinding wheel mounting disc can be inserted into the end of the grinding wheel spindle. The connecting pin hole on the grinding wheel flange seat has its upper end passing through the pin insertion hole on the snap-fit ​​plate. Moving the snap-fit ​​plate radially along the grinding wheel flange seat allows the snap-fit ​​groove on the connecting pin to engage with the snap-fit ​​plate. After engagement, the grinding wheel mounting disc is connected to the grinding wheel flange seat. Only when the snap-fit ​​plate is moved can the connecting pin be pulled out from the pin insertion hole on the snap-fit ​​plate and the connecting pin hole on the grinding wheel flange seat, allowing the grinding wheel mounting disc to be separated from the grinding wheel flange seat. In this way, the assembly and disassembly of the grinding wheel mounting disc and the grinding wheel flange seat can be completed by simply inserting and removing the connecting pin and moving the snap-fit ​​plate, making the installation and disassembly of the grinding wheel very convenient.

[0006] Furthermore, since a coil is provided inside the grinding wheel flange seat, and the coil is embedded in the annular groove of the grinding wheel flange seat, the coil embedded in the annular groove of the grinding wheel flange seat will form an electromagnet structure with the grinding wheel flange seat. After the coil is energized, it will generate a corresponding attraction force to attract the iron grinding wheel mounting plate and the grinding wheel flange seat together. As long as the power input to the coil is maintained, the grinding wheel mounting plate can be kept fixed to the grinding wheel flange seat.

[0007] Furthermore, since the grinding wheel shaft is a hollow shaft, the lead wire of the coil passes through the inner hole of the hollow grinding wheel shaft and is connected to the power supply through a conductive slip ring installed at the other end of the grinding wheel shaft. Thus, the power input of the coil will be obtained from the external power supply through the wire passing through the hollow grinding wheel shaft and the conductive slip ring. The conductive slip ring is a mature and universal product with stable quality assurance, thereby ensuring a stable fixed connection after the grinding wheel is installed.

[0008] In a preferred embodiment of this invention, two connecting pins are evenly distributed along the circumference of the grinding wheel mounting disc. This embodiment allows the two connecting pins to stably connect the grinding wheel mounting disc to the grinding wheel flange seat, and also facilitates manufacturing.

[0009] In another preferred embodiment of this utility model, the snap-fit ​​groove is a groove formed circumferentially along the outer periphery of the connecting pin. This embodiment results in a simple snap-fit ​​groove structure and convenient processing.

[0010] In another preferred embodiment of this utility model, the pin insertion hole is an oblong hole, the width of which corresponds to the outer diameter of the connecting pin, and the length direction of each oblong hole is the same. This embodiment ensures that each pin insertion hole and the connecting pin can be smoothly inserted, and that after the snap-fit ​​plate is radially shifted, each connecting pin can simultaneously engage and disengage with the pin insertion hole.

[0011] In a further preferred embodiment of this invention, the snap-fit ​​plate has a frame-shaped structure in the middle, with insertion holes on opposite sides of the frame-shaped structure. The pin insertion hole is located on the insertion hole, and the length direction of the pin insertion hole is parallel to the line connecting the two insertion holes. With this embodiment, the snap-fit ​​plate with the frame-shaped structure in the middle can accommodate the requirement that the two connecting pins are evenly distributed along the circumference of the grinding wheel mounting disc.

[0012] In another further preferred embodiment of this utility model, a retaining plate groove for mounting a retaining plate is provided on the upper end face of the flange edge of the grinding wheel flange seat. A gap is left between the retaining plate groove and the retaining plate in the direction of the line connecting the two insertion holes. The sides of the two insertion holes of the retaining plate are slidably engaged with the retaining plate groove. With this embodiment, the retaining plate can have a defined mounting position on the grinding wheel flange seat and can be moved only radially along the grinding wheel flange seat.

[0013] In another preferred embodiment of this utility model, a spring is provided between the snap-fit ​​plate and the grinding wheel flange seat. The direction of the spring's force is the same as the length direction of the pin insertion hole. Under the action of the spring, the snap-fit ​​plate engages with the snap-fit ​​groove on the connecting pin, and one side of the insertion hole extends out of the flange edge of the grinding wheel flange seat. Using this embodiment, the snap-fit ​​plate can be kept engaged with the snap-fit ​​groove on the connecting pin. When installing and connecting the grinding wheel mounting plate and the grinding wheel flange seat, simply press the part of the insertion hole extending out of the flange edge of the grinding wheel flange seat to position the snap-fit ​​plate so that the connecting pin can be inserted into the pin insertion hole. Pass the connecting pin on the grinding wheel mounting plate through the pin insertion hole, and then release the pressure on the snap-fit ​​plate's insertion hole. The compression spring will maintain the snap-fit ​​state between the snap-fit ​​plate and the snap-fit ​​groove, making it convenient and reliable to use.

[0014] In a further preferred embodiment of this invention, a protective plate is provided on the outer side of the snap-fit ​​plate. This protective plate is fixedly connected to the grinding wheel flange seat. This embodiment limits the axial position of the snap-fit ​​plate and maintains cleanliness between the snap-fit ​​plate, its groove, and the compression spring, ensuring flexible movement of the snap-fit ​​plate. Attached Figure Description

[0015] The electromagnetic quick-change device for grinding wheels of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of a specific embodiment of the electromagnetic quick-change device for grinding wheels of this utility model;

[0017] Figure 2 yes Figure 1 A cross-sectional view of part AA in the structure shown;

[0018] Figure 3 yes Figure 2 The diagram shows the structure of the snap-fit ​​plate in the structure shown.

[0019] In the diagram: 1-grinding wheel, 2-grinding wheel inner chuck, 3-grinding wheel mounting plate, 4-connecting pin, 5-connecting pin hole, 6-pin insertion hole, 7-clamping plate, 8-spring, 9-grinding wheel flange seat, 10-annular groove, 11-coil, 12-clamping groove, 13-guard plate, 14-grinding wheel shaft, 15-conductive slip ring, 16-clamping plate groove, 17-insertion hole. Detailed Implementation

[0020] exist Figure 1 and Figure 2In the electromagnetic quick-change device for grinding wheels shown, the grinding wheel flange seat 9 is installed at the lower end of the grinding wheel shaft 14. The grinding wheel 1 is clamped by the inner grinding wheel chuck 2 and the grinding wheel mounting plate 3 through fastening bolts. At least two connecting pins 4 are fixed on the upper end of the grinding wheel mounting plate 3. The number of connecting pins 4 shown in the figure is two. The two connecting pins 4 are evenly distributed around the circumference of the grinding wheel mounting plate 3. The lower end of the connecting pin 4 is screwed and fixed to the grinding wheel mounting plate 3. The connecting pin 4 can be a cylindrical rod. A snap-fit ​​groove 12 is provided at the upper end of the extended connecting pin 4. The snap-fit ​​groove 12 is preferably an annular groove opened along the outer circumference of the connecting pin 4. The grinding wheel flange seat 9 has connecting pin holes 5 corresponding to the number, position, and diameter of the connecting pins 4. The portion of the extended connecting pin 4 below the locking groove 12 is slidably inserted into the connecting pin holes 5. A locking plate 7, which can move radially along the grinding wheel flange seat 9, is provided on the upper end face of the flange edge. The locking plate 7 is installed in the locking plate groove 16 provided on the upper end face of the flange edge of the grinding wheel flange seat 9. The locking plate 7 has pin insertion holes 6 corresponding to the number and position of the connecting pins 4. The pin insertion holes 6 are preferably oblong holes, the width of which corresponds to the outer diameter of the connecting pin 4, and the length direction of each oblong hole is the same. The upper end of the connecting pin 4 passes through the pin insertion hole 6. The thickness of the locking plate 7 corresponds to the width of the locking groove 12. The connecting pin 4 can be engaged with the movable locking plate 7 through the locking groove 12. (See also...) Figure 3The middle part of the snap-fit ​​plate 7 has a frame-shaped structure, corresponding to the positions of the two connecting pins 4. Insertion holes 17 are provided on opposite sides of the middle part of the frame-shaped structure. Pin insertion holes 6 are located on the insertion holes 17, and the length direction of the pin insertion holes 6 is parallel to the line connecting the two insertion holes 17. A gap is left between the snap-fit ​​plate 7 and the snap-fit ​​plate groove 16 in the line connecting the two insertion holes 17. The sides of the two insertion holes 17 of the snap-fit ​​plate 7 slide against the snap-fit ​​plate groove 17 to limit the movement of the snap-fit ​​plate 7. In the direction of movement, a spring 8 is provided between the snap-fit ​​plate 7 and the grinding wheel flange seat 9. The spring 8 is preferably a helical compression spring, and its force direction is the same as the length direction of the pin insertion hole 6. Under the action of the spring 8, the snap-fit ​​plate 7 is snapped into the snap-fit ​​groove 12 on the connecting pin 4, and one side of the insertion hole 17 extends out of the flange edge of the grinding wheel flange seat 9. The insertion hole 17 extending out of the flange edge of the grinding wheel flange seat 9 is used as a pressing part to control the position of the snap-fit ​​plate 7. After pressing, it will overcome the force of the spring 8 and make... When the snap-fit ​​plate 7 retracts, it disengages from the snap-fit ​​groove 12, allowing the head of the connecting pin 4 to be pulled out of the pin insertion hole 6. The grinding wheel mounting disc 3, connected to the grinding wheel flange seat 9 via the connecting pin 4, can then be removed from the grinding wheel flange seat 9 for grinding wheel 1 replacement. Conversely, when reinstalling the grinding wheel 1, the connecting pin 4 on the grinding wheel mounting disc 3 is inserted into the connecting pin hole 5, and the protruding insertion hole 17 of the snap-fit ​​plate 7 is pressed down. The snap-fit ​​plate 7 will retract, centering the pin insertion hole 6. With the center of the connecting pin hole 5 basically coinciding, the top of the connecting pin 4 can pass through the pin insertion hole 6, releasing the pressure on the insertion hole 17. Under the action of the spring 8, the snap-fit ​​plate 7 moves towards the pressing side, and the edge of the pin insertion hole 6 on the snap-fit ​​plate 7 can be snapped into the snap slot 12 on the connecting pin 4. Thus, the connecting pin 4 can be snapped into the snap-fit ​​plate 7 through the snap-fit ​​slot 12, and the grinding wheel mounting disc 3 is thus restricted axially and connected to the grinding wheel flange seat 9. A protective plate 13 is provided on the outside of the snap-fit ​​plate 7. The protective plate 13 is fixed to the grinding wheel flange seat 9. The snap-fit ​​plate 7 is limited by the protective plate 13 and can only move in the direction of the line connecting the two insertion holes 17 with the gap between them and the snap-fit ​​plate groove 16 (i.e., the radial direction of the grinding wheel flange seat 9). The protective plate 13 also provides dust protection.

[0021] A coil 11 is provided inside the grinding wheel flange seat 9. The coil 11 is embedded in the annular groove 10 of the grinding wheel flange seat 9 and forms an electromagnet structure with the grinding wheel flange seat 9. The grinding wheel shaft 14 is a hollow shaft. The lead wire of the coil 11 passes through the inner hole of the hollow grinding wheel shaft 14 and is connected to the power supply through the conductive slip ring 15 installed at the other end of the grinding wheel shaft 14. The stator part of the conductive slip ring 15 is fixed to the support of the grinding wheel shaft 14. The rotating part of the conductive slip ring 15 rotates together with the hollow grinding wheel shaft 14. After the coil 11 is energized by the power supply through the conductive slip ring 15, the grinding wheel flange seat 9 with the coil 11 is generated by electromagnetic attraction, which firmly holds the grinding wheel mounting plate 3, thereby ensuring that the grinding wheel 1 can perform grinding operations stably and reliably with the grinding wheel shaft 14.

[0022] The above are just some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. For example, the number of connecting pins 4 may not be two, but three or more; the snap-fit ​​plate 7 may not be limited to the sliding fit between the sides of the two insertion holes 17 and the snap-fit ​​plate groove 17 to limit the movement direction of the snap-fit ​​plate 7, but may be limited to the sliding fit between other parts and the opposite sides of the snap-fit ​​plate groove 17 to limit the radial movement of the snap-fit ​​plate 7 along the grinding wheel flange seat 9, and so on. As long as the improvements and modifications are made on the basis of the basic principle of this utility model, they should be considered to fall within the protection scope of this utility model.

Claims

1. An electromagnetic quick-change device for grinding wheels, comprising a grinding wheel shaft (14), a grinding wheel flange seat (9) mounted on one end of the grinding wheel shaft (14), an inner grinding wheel chuck (2) for clamping the grinding wheel (1), and a grinding wheel mounting disc (3), characterized in that: At least two connecting pins (4) are fixedly provided on the upper end of the grinding wheel mounting plate (3). The extended end of the connecting pin (4) is provided with a snap-fit ​​groove (12). The grinding wheel flange seat (9) is provided with a connecting pin hole (5) corresponding to the connecting pin (4). A snap-fit ​​plate (7) that can move radially along the grinding wheel flange seat (9) is provided on the upper end surface of the flange edge of the grinding wheel flange seat (9). A pin insertion hole (6) corresponding to the connecting pin (4) is provided on the snap-fit ​​plate (7). The upper end of the connecting pin (4) passes through the pin insertion hole (6). The thickness of the snap-fit ​​plate (7) corresponds to the width of the snap-fit ​​groove (12), and the connecting pin (4) can be snapped with the movable snap-fit ​​plate (7) through the snap-fit ​​groove (12); a coil (11) is provided in the grinding wheel flange seat (9), and the coil (11) is embedded in the annular groove (10) of the grinding wheel flange seat (9); the grinding wheel shaft (14) is a hollow shaft, and the lead wire of the coil (11) passes through the inner hole of the hollow grinding wheel shaft (14) and is connected to the power supply through the conductive slip ring (15) installed at the other end of the grinding wheel shaft (14).

2. The electromagnetic quick-change device for grinding wheels according to claim 1, characterized in that: The connecting pins (4) consist of two pieces, and the two connecting pins (4) are evenly distributed around the grinding wheel mounting plate (3).

3. The electromagnetic quick-change device for grinding wheels according to claim 1 or 2, characterized in that: The snap-fit ​​groove (12) is a groove opened along the outer circumference of the connecting pin (4).

4. The electromagnetic quick-change device for grinding wheels according to claim 1 or 2, characterized in that: The pin insertion hole (6) is an oblong hole, the width of which corresponds to the outer diameter of the connecting pin (4), and the length direction of each oblong hole is the same.

5. The electromagnetic quick-change device for grinding wheels according to claim 1, characterized in that: The middle part of the snap-fit ​​plate (7) has a frame-shaped structure, and there are insertion holes (17) on opposite sides of the middle part of the frame-shaped structure. The pin insertion hole (6) is located on the insertion hole (17), and the length direction of the pin insertion hole (6) is parallel to the line connecting the two insertion holes (17).

6. The electromagnetic quick-change device for grinding wheels according to claim 1, characterized in that: The upper end face of the flange edge of the grinding wheel flange seat (9) is provided with a snap-fit ​​plate groove (16) for installing the snap-fit ​​plate (7). There is a gap between the snap-fit ​​plate groove (16) and the snap-fit ​​plate (7) in the direction of the line connecting the two insertion holes (17). The sides of the two insertion holes (17) of the snap-fit ​​plate (7) are slidably fitted with the snap-fit ​​plate groove (16).

7. The electromagnetic quick-change device for grinding wheels according to claim 1, characterized in that: A spring (8) is provided between the snap-fit ​​plate (7) and the grinding wheel flange seat (9). The direction of the force of the spring (8) is the same as the length direction of the pin insertion hole (6). Under the action of the spring (8), the snap-fit ​​plate (7) is snapped into the snap-fit ​​groove (12) on the connecting pin (4) and one side of the insertion hole (17) extends out of the flange edge of the grinding wheel flange seat (9).

8. The electromagnetic quick-change device for grinding wheels according to claim 1, characterized in that: A protective plate (13) is provided on the outside of the snap-fit ​​plate (7), which is fixed to the grinding wheel flange seat (9).

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