Secondary floating power head for metallographic grinding and polishing

Abstract

The invention provides a two-stage floating power head for metallographic grinding and polishing, and belongs to the technical field of metallographic grinding and polishing. Aiming at the problem of poor grinding and polishing effect caused by non-uniform force application of a metallographic grinding and polishing power head, the secondary floating power head comprises a driving mechanism, a first floating mechanism, a second floating mechanism and a grinding and polishing mechanism, the first floating mechanism comprises two air cylinders, a floating seat is arranged between the two air cylinders, and the two sides of the floating seat are connected with piston rods of the two air cylinders correspondingly. The second floating mechanism comprises a connector and a mounting seat, and one end of the connector is rotationally connected with the floating seat and is in transmission connection with the transmission shaft; the other end of the connector is movably clamped in the mounting seat, and the matching surface of the connector and the mounting seat in the axial direction is a spherical crown surface; the grinding and polishing mechanism comprises a clamp disc and a sand disc installation base which are oppositely arranged, the clamp disc is fixedly connected with the installation base, and the clamp disc is provided with a plurality of installation openings. Through cooperation of the first floating mechanism and the second floating mechanism, uniform force application can be achieved, so that the grinding and polishing uniformity is improved, and the grinding and polishing effect is improved.

Description

Technical Field

[0001] This application relates to the field of metallographic polishing technology, and in particular to a two-stage floating power head for metallographic polishing. Background Technology

[0002] Metallographic grinding and polishing refers to the grinding and polishing of metallographic samples during the sample preparation process, which is usually accomplished using a grinding and polishing machine.

[0003] The most important component of the polishing machine is the power head, which includes the clamping disc. The clamping disc is used to hold the workpiece to be polished (the polishing disc is fixed below). The main body of the power head applies pressure to the polishing surface through the clamping disc to achieve polishing. However, it has been found that the polishing pressure applied by the current power head is uneven, resulting in poor polishing effect. Summary of the Invention

[0004] The purpose of this application is to solve the problem of poor polishing effect caused by uneven force application in the metallographic polishing power head in the prior art. Therefore, this application provides a two-stage floating power head for metallographic polishing. Through the cooperation of the first floating mechanism and the second floating mechanism, the clamping disk is kept parallel to the polishing surface, thereby achieving uniform force application, improving polishing uniformity, and enhancing polishing effect.

[0005] This application provides a two-stage floating power head for metallographic grinding and polishing, including a drive mechanism, a first floating mechanism, a second floating mechanism, and a grinding and polishing mechanism; The drive mechanism includes a motor and a transmission shaft, the transmission shaft being connected to the drive end of the motor to rotate under the drive of the motor; The first floating mechanism includes two cylinders spaced apart along a first direction, and the piston rods of the two cylinders are perpendicular to the first direction. A floating seat is provided in the middle of the two cylinders, and the two sides of the floating seat are respectively connected to the piston rods of the two cylinders, so that the floating seat can swing left and right under the adjustment of the two cylinders. The second floating mechanism includes a connector and a mounting base. The axial direction of the connector is perpendicular to the first direction, and one end of the connector is rotatably connected to the floating base and driven by the drive shaft, so that the connector can rotate under the drive of the drive shaft. The other end of the connector is movably engaged in the mounting base, and the axial mating surface of the connector and the mounting base is a spherical cap surface, so that the mounting base can swing relative to the connector in the circumferential direction. The polishing mechanism includes a clamping disc and a sand disc mounting base arranged opposite to each other. The sand disc mounting base is used to mount the sand disc and tilts the polishing surface of the sand disc at a preset angle. The clamping disc is fixedly connected to the mounting base so that the clamping disc can swing synchronously with the mounting base to keep parallel to the polishing surface. The clamping disc is used to hold the workpiece to be ground and polished, and the clamping disc is provided with a plurality of mounting ports extending through its thickness direction. The mounting ports are used to mount the workpiece to be ground and polished, and the mounting ports are teardrop-shaped. The workpiece to be ground and polished is locked by fasteners abutting against the side of the mounting port toward the tail of its teardrop shape.

[0006] In some embodiments, the other end of the connector is a first connector end, the first connector end and the mating surface of the mounting base have a gap, and both mating surfaces are provided with receiving grooves along the axial direction of the connector, and a positioning ball is movably engaged between the two receiving grooves.

[0007] In some embodiments, the motor is connected to the drive shaft via a pulley drive assembly, and the drive shaft is fixed to a synchronous pulley in the pulley drive assembly via a crossed roller bearing.

[0008] In some embodiments, one end of the connector is a second connector end, and the second connector end is detachably connected to a connecting sleeve, and is rotatably connected to the floating seat and driven by the connecting sleeve; The drive shaft passes through the floating seat; and... The outer side of the connecting sleeve is rotatably connected to the floating seat via a deep groove bearing; the inner side of the connecting sleeve is drive-connected to the drive shaft passing through the floating seat via a key.

[0009] In some embodiments, the second connection end is provided with a plurality of snap-fit ​​slots spaced apart along its circumference; The connecting sleeve includes a main sleeve, a secondary sleeve, and multiple limiting members; the main sleeve has multiple through grooves corresponding to the multiple snap-fit ​​grooves on its circumferential direction, and the limiting members are movably snapped into the through grooves; the secondary sleeve is sleeved on the outside of the main sleeve, and the secondary sleeve has a push-out portion and a clearance portion sequentially arranged along the axial direction of the main sleeve; and... The secondary sleeve can move along the axial direction of the main sleeve, so that the secondary sleeve has a locked state and an unlocked state; In the locked state, the push-out part can push the limiting member part to engage in the engaging groove of the connector, so that the connector and the connecting sleeve are connected; In the unlocked state, the avoidance part can avoid the limiting member, so that the connector can push the limiting member away from the snap-fit ​​groove and cause the connector to disengage from the connecting sleeve.

[0010] In some embodiments, a spring is further sleeved between the main sleeve and the secondary sleeve, and the spring applies a thrust to the secondary sleeve so that the push-out portion of the secondary sleeve can continue to push the limiting member.

[0011] In some embodiments, the limiting member is a sphere.

[0012] In some embodiments, the second connecting end and the main sleeve are each provided with a pin hole, the axis of which is perpendicular to the axis of the main sleeve, so that the connecting end and the connecting sleeve can pass through each other via a drive pin after they are connected.

[0013] Beneficial effects: This application enables a first-level floating mechanism that allows the clamping disc to swing left and right, thereby coarsely adjusting the clamping disc's posture to ensure efficiency and control the downward pressure. A second-level floating mechanism enables a second-level floating mechanism that allows the clamping disc to swing circumferentially, achieving multi-directional adjustment and further fine-tuning the clamping disc's posture. This ensures the clamping disc remains parallel to the polishing surface, thus applying uniform pressure to the surface and rapidly improving the overall polishing uniformity of multiple parts on the clamping disc, thereby enhancing the polishing effect.

[0014] Other features and corresponding beneficial effects of this application will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in this application. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram of the drive mechanism in this application; Figure 3 This is a schematic diagram of the structure of the first floating mechanism in this application; Figure 4 This is a cross-sectional schematic diagram of the first floating mechanism in this application; Figure 5 This is a schematic diagram of the assembled and partially disassembled grinding and polishing mechanism and the second floating mechanism in this application. Figure 6 This is a cross-sectional view of the grinding and polishing mechanism and the second floating mechanism after assembly and partial disassembly in this application; Figure 7 This is a partial cross-sectional view of the connector and connecting sleeve in the assembled state in this application.

[0016] Explanation of reference numerals in the attached figures: 1. Fixing plate; 2. Drive mechanism; 2.1 Motor; 2.2 Reducer; 2.3 Fixed base; 2.4 Tensioner block; 2.5 Small synchronous pulley; 2.6 Large synchronous pulley; 2.7 Synchronous belt; 2.8 Drive shaft; 3. First floating mechanism; 3.1 Cylinder; 3.2 Throttle valve; 3.3 Floating seat; 3.4 Crossed roller bearing; 3.5 Deep groove bearing; 3.6 Retaining ring; 3.7 Locking nut; 3.12 Piston rod; 4. Grinding and polishing mechanism; 4.1 Main sleeve; 4.2 Snap ring retainer; 4.3 Secondary sleeve; 4.4 Second connecting end; 4.5 Transmission pin; 4.6 Upper pressure block; 4.7 Lower pressure block; 4.8 Clamping disc; 4.9 Spring; 4.10 Wire retainer; 4.11 Positioning ball; 4.12 Sealing ring; 4.13 Limiting component; 4.14 Mounting port. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0018] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] Please see Figure 1 as well as Figures 5-6 , Figure 1 This is a schematic diagram of the structure of this application; Figure 5 This is a schematic diagram of the assembled and partially disassembled grinding and polishing mechanism and the second floating mechanism in this application. Figure 6 This is a cross-sectional view of the grinding and polishing mechanism and the second floating mechanism in this application after assembly and partial disassembly.

[0021] This application provides a two-stage floating power head for metallographic polishing, including a drive mechanism 2, a first floating mechanism 3, a second floating mechanism, and a polishing mechanism 4.

[0022] The drive mechanism 2 includes a motor 2.1 and a drive shaft 2.8. The drive shaft 2.8 is connected to the drive end of the motor 2.1 to rotate under the drive of the motor 2.1.

[0023] The first floating mechanism 3 includes two cylinders 3.1 spaced apart along a first direction and a floating seat 3.3. The piston rods 3.12 of the two cylinders 3.1 are perpendicular to the first direction. The floating seat 3.3 is located in the middle of the two cylinders 3.1, and both sides of the floating seat 3.3 are connected to the piston rods 3.12 of the two cylinders 3.1 respectively, so that the floating seat 3.3 can swing left and right under the adjustment of the two cylinders 3.1, that is, the two sides of the floating seat 3.3 can have a height difference, thus achieving an inclined posture.

[0024] The second floating mechanism includes a connector and a mounting base. The axis of the connector is perpendicular to the first direction, and one end of the connector is rotatably connected to the floating base 3.3 and drively connected to the drive shaft 2.8, so that the connector can rotate under the drive of the drive shaft 2.8. Furthermore, the connector can swing synchronously left and right under the drive of the floating base 3.3.

[0025] The other end of the connector, namely the first connecting end, is movably engaged within the mounting base. This means the connector can move within the mounting base (e.g., lift, rotate, swing, etc.) via the first connecting end, but cannot detach from the mounting base. Preferably, the diameter of the first connecting end is larger than the opening diameter of the mounting base but smaller than its inner cavity diameter, thus restricting the connection between the connector and the mounting base via the first connecting end.

[0026] The mating surfaces of the first connecting end and the mounting base in the axial direction of the connecting head are spherical cap surfaces, which allows the mounting base to swing relative to the connecting head in the circumferential direction. That is, the mounting base can tilt in multiple directions, and the structure is simple and easy to manufacture.

[0027] The polishing mechanism 4 includes a clamping disc 4.8 and a sanding disc mounting base arranged opposite to each other.

[0028] The sanding disc mounting base is used to mount the sanding disc and to tilt the polishing surface of the sanding disc at a preset angle, usually in a horizontal state.

[0029] The clamping disc 4.8 is used to hold the workpiece to be ground and polished. It is fixedly connected to the mounting base so that the clamping disc 4.8 can swing synchronously with the mounting base to keep it parallel to the grinding and polishing surface.

[0030] That is, the clamping plate 4.8 can achieve a first-level floating by swinging left and right through the first floating mechanism, thereby coarsely adjusting its posture. The active adjustment of the first floating mechanism can ensure efficiency and control the downward pressure. Furthermore, the clamping plate 4.8 can also achieve a second-level floating by swinging circumferentially through the second floating mechanism, thereby achieving multi-directional adjustment. The passive adjustment can be achieved through the mounting base close to the clamping plate 4.8, which can quickly provide feedback for adjustment and further fine-tune the posture of the clamping plate. This allows the clamping plate to remain parallel to the polishing surface, thereby applying pressure evenly to the polishing surface, improving polishing uniformity, and enhancing the polishing effect.

[0031] In particular, the fixture plate 4.8 is provided with multiple mounting ports 4.14 extending through its thickness direction. The mounting ports 4.14 are used to mount the workpieces to be ground and polished. That is, there are multiple workpieces to be ground and polished on the fixture plate 4.8. Through the cooperation of the first floating mechanism and the second floating mechanism, the overall grinding and polishing uniformity of the multiple workpieces to be ground and polished on the fixture plate can be quickly improved.

[0032] Preferably, the mounting opening 4.14 is teardrop-shaped and is secured to the workpiece by fasteners, such as set screws, which abut against the teardrop-shaped tail of the mounting opening 4.14 from the side, thereby improving assembly convenience and reliability and ensuring the strength of the clamping disc 4.8.

[0033] Understandably, the first floating mechanism 3 can also adjust the height of the clamping plate by raising and lowering two cylinders, so as to accommodate samples of different heights and allow the clamping plate 4.8 to contact the sample, as well as other operations, such as raising the position of the clamping plate 4.8 for easy assembly and disassembly.

[0034] In one embodiment, the other end of the connector is a first connecting end. The mating surfaces of the first connecting end and the mounting base have a gap, and both mating surfaces are provided with receiving grooves along the axial direction of the connector. A positioning ball 4.11 is movably engaged between the two receiving grooves.

[0035] At this time, on the one hand, the first connecting end and the mounting base swing relative to each other with the positioning ball 4.11 as the reference, so that the clamping disk 4.8 swings relative to the connecting head. On the other hand, the positioning ball 4.11 located in the axial direction can ensure that the center line of the clamping disk 4.8 still coincides with the axis of rotation after swinging, so as to avoid the clamping disk 4.8 from moving horizontally while swinging, deviating from the optimal grinding and polishing position, and affecting the grinding and polishing effect.

[0036] Understandably, the clamping disc 4.8 can achieve synchronous rotation through the friction between the mounting base and the first connecting end of the connector.

[0037] Preferably, the mounting base includes an upper pressure block 4.6 and a lower pressure block 4.7 connected by bolts, which together form an inner cavity of the mounting base, thereby facilitating the assembly of the first connecting end of the connector and the mounting base.

[0038] The clamping disc 4.8 can also be fixedly connected to the mounting base by bolts, which further facilitates the maintenance and replacement of the clamping disc 4.8.

[0039] A sealing ring 4.12 can be provided between the open end of the mounting base and the first connecting end to seal and protect the inner cavity of the mounting base, thereby improving the reliability of the relative swinging of the mounting base and the first connecting end.

[0040] In one embodiment, one end of the connector is a second connecting end, and the second connecting end is detachably connected to a connecting sleeve, and is rotatably connected to the floating seat 3.3 and is also drively connected to the drive shaft 2.8 through the connecting sleeve.

[0041] The drive shaft 2.8 passes through the floating seat 3.3. Furthermore, the outer side of the connecting sleeve is rotatably connected to the floating seat 3.3 via a deep groove bearing 3.5; the inner side of the connecting sleeve is connected to the drive shaft 2.8 passing through the floating seat 3.3 via a key fit.

[0042] The clamping disc 4.8 is detachably connected to the drive mechanism 2 and the first floating mechanism 3 through the connector and the connecting sleeve, which facilitates the replacement and maintenance of the clamping disc 4.8.

[0043] Furthermore, the multi-directional swing provided by the first floating mechanism 3 and the second floating mechanism to the clamping plate 4.8 can compensate for the decrease in the connection accuracy between the clamping plate 4.8 and the drive shaft 2.8 caused by the detachability, ensuring that the replaced clamping plate 4.8 can quickly reach the optimal grinding and polishing posture.

[0044] In one embodiment, the inner side of the connecting sleeve is splined or keyed to the drive shaft 2.8, so that it can both transmit power and slide up and down.

[0045] In one embodiment, the power head further includes a fixed plate 1. The drive mechanism 2 is disposed on one side of the fixed plate 1, and the cylinder 3.1 in the first floating mechanism 3 is disposed on the same side. The piston rod 3.12 of the cylinder 3.1 passes through the fixed plate 1 and is connected to the floating seat 3.3 disposed on the other side of the fixed plate 1. Thus, the drive mechanism 2, the first floating mechanism 3, the second floating mechanism and the grinding and polishing mechanism 4 are integrated through the fixed plate 1, which facilitates the subsequent assembly of the power head with other parts of the grinding and polishing machine.

[0046] Please see Figure 2 , Figure 2 This is a schematic diagram of the drive mechanism 2 in this application.

[0047] In one embodiment, the drive mechanism 2 further includes a reducer 2.2, a fixed base 2.3, a tensioning block 2.4, a small synchronous pulley 2.5, a large synchronous pulley 2.6, and a synchronous belt 2.7. The small synchronous pulley 2.5, the large synchronous pulley 2.6, and the synchronous belt 2.7 constitute a belt drive assembly. The motor 2.1, preferably a servo motor, is fixed to the reducer 2.2, which is fixed to the fixed base 2.3. The small synchronous pulley 2.5 is fixed to the drive shaft at the end of the reducer 2.2. The small synchronous pulley 2.5 is connected to the large synchronous pulley 2.6 via the synchronous belt 2.7. The motor 2.1 drives the transmission of power to the drive shaft 2.8 via the synchronous belt 2.7.

[0048] A tensioning block 2.4 is set on each side of the fixed seat 2.3. A screw can be fixed inside the tensioning block 2.4. The distance between the drive shaft 2.8 and the fixed seat 2.3 can be adjusted by adjusting the screw (for example, the fixed seat 2.3 is fixed to the fixed plate 1 by the tensioning block 2.4, and the tensioning block 2.4 is fixed to the fixed plate 1 by the screw), thereby adjusting the tension of the timing belt 2.7.

[0049] Please see Figures 3-4 , Figure 3 This is a schematic diagram of the structure of the first floating mechanism 3 in this application; Figure 4 This is a cross-sectional schematic diagram of the first floating mechanism 3 in this application.

[0050] In one embodiment, the floating seat 3.3 has a through mounting hole at its center, and a cross roller bearing 3.4 and a deep groove bearing 3.5 are stacked inside the mounting hole to facilitate connection with the drive shaft 2.8 and the connecting sleeve, and the structure is compact.

[0051] Specifically, the drive shaft 2.8 is fixed to a synchronous pulley, namely the large synchronous pulley 2.6, in the pulley drive assembly via a crossed roller bearing 3.4, thereby achieving synchronous rotation with axial offset. The connecting sleeve is rotatably connected to the floating seat 3.3 via a deep groove bearing 3.5, thereby achieving both fixation and rotatability.

[0052] In one embodiment, the first floating mechanism 3 further includes a throttle valve 3.2, a retaining ring 3.6, and a locking nut 3.7. The piston rods 3.12 of the two cylinders 3.1 are respectively connected to the two ends of the floating seat 3.3, and two throttle valves 3.2 are fixed at the top and bottom of each cylinder 3.1. When air enters through the upper throttle valve 3.2, the piston rod 3.12 of the cylinder 3.1 descends; conversely, when air enters through the lower throttle valve 3.2, the piston rod 3.12 of the cylinder 3.1 rises. The end of the piston rod 3.12 is fixed to the floating seat 3.3 with a locking nut 3.7.

[0053] Please see Figures 5-7 , Figure 5 This is a schematic diagram of the assembled and partially disassembled grinding and polishing mechanism and the second floating mechanism in this application. Figure 6 This is a cross-sectional view of the grinding and polishing mechanism and the second floating mechanism after assembly and partial disassembly in this application; Figure 7 This is a partial cross-sectional view of the connector and connecting sleeve in the assembled state in this application.

[0054] In one embodiment, the connector includes a second connector end 4.4, which has a plurality of snap-fit ​​slots spaced apart along its circumference.

[0055] The connecting sleeve includes a main sleeve 4.1, a secondary sleeve 4.3, and multiple limiting members 4.13. The main sleeve 4.1 has multiple through slots corresponding to multiple snap-fit ​​slots on its circumferential direction, and the limiting members 4.13 are movably snapped into the through slots. The secondary sleeve 4.3 is sleeved on the outside of the main sleeve 4.1, and the secondary sleeve 4.3 has a push-out portion and a clearance portion sequentially arranged along the axial direction of the main sleeve 4.1.

[0056] Furthermore, the secondary sleeve 4.3 can move axially along the main sleeve 4.1, so that the secondary sleeve 4.3 has a locked state and an unlocked state.

[0057] When locked, the push-out part can push the limiting member 4.13 into the locking groove of the connector, so that the connector and the connecting sleeve are connected.

[0058] In the unlocked state, the clearance part can avoid the limiting member 4.13 (that is, a clearance space is formed between the clearance part and the main sleeve 4.1), so that the connector can push the limiting member 4.13 out of the snap-fit ​​groove and cause the connector to disengage from the connecting sleeve.

[0059] This method allows for quick disassembly of the connector and connecting sleeve, and it features a simple structure and is easy to manufacture.

[0060] Understandably, at this time, the outer side of the main sleeve 4.1 is connected to the floating seat 3.3, and the inner side of the main sleeve 4.1 is connected to the drive shaft 2.8 and the connector to transmit power.

[0061] In one embodiment, a spring 4.9 is also sleeved between the main sleeve 4.1 and the auxiliary sleeve 4.3. The spring 4.9 applies a thrust to the auxiliary sleeve 4.3 so that the push-out part of the auxiliary sleeve 4.3 can maintain the push-limiting member 4.13.

[0062] Preferably, the limiting member 4.13 is a sphere, which facilitates its movement and engagement within the through groove, and allows for smooth pushing.

[0063] In one embodiment, both the second connecting end 4.4 and the main sleeve 4.1 are provided with corresponding pin holes. The axial direction of the pin holes is perpendicular to the axial direction of the main sleeve 4.1, so that after the connector and the connecting sleeve are connected, the transmission pin 4.5 passes through to achieve rotational limitation, thereby improving the connection reliability of the connecting sleeve and the connector, ensuring the reliability of the rotational transmission from the transmission shaft 2.8 to the connecting sleeve, and from the connecting sleeve to the connector, thereby ensuring the polishing effect.

[0064] This method is particularly suitable for multiple snap-fit ​​slots to be connected together in the circumferential direction at the second connecting end 4.4 to form an annular groove. The annular groove facilitates the assembly of the two and achieves axial positioning. Combined with the transmission pin 4.5, the two can finally move synchronously.

[0065] In one embodiment, the polishing mechanism 4 further includes a retaining ring 4.2 and a wire retaining ring 4.10.

[0066] The retaining ring 4.2 is fixed to the upper end of the main sleeve 4.1. The retaining ring 4.2 can fix the main sleeve 4.1 to the first floating mechanism 3 and prevent it from falling off. The wire retaining ring 4.10 is fixed to the lower end of the main sleeve 4.1. Its function is to prevent the secondary sleeve 4.3 from falling off. A spring 4.9 and a limiting member 4.13 are placed between the secondary sleeve 4.3 and the main sleeve 4.1.

[0067] Under normal circumstances, the limiting member 4.13 is pressed into the main sleeve 4.1 by the secondary sleeve 4.3. Manually pushing the secondary sleeve 4.3 upwards (overcoming the pressure of the spring 4.9) will relieve the pressure on the limiting member 4.13. The second connecting end 4.4 enters the main sleeve 4.1, and as the second connecting end 4.4 moves upwards, the limiting member 4.13 is fully inserted into the through groove of the main sleeve 4.1. Then, releasing the secondary sleeve 4.3 will press the limiting member 4.13 into the main sleeve 4.1 and lock the second connecting end 4.4, completing the assembly. To disassemble, simply push the secondary sleeve 4.3 upwards again.

[0068] Preferably, the upper end of the second connecting end 4.4 has a taper, which is consistent with the taper of the lower end of the main sleeve 4.1, so that they are coaxial through the taper fit.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A two-stage floating power head for metallographic polishing, characterized in that, It includes a drive mechanism, a first floating mechanism, a second floating mechanism, and a grinding and polishing mechanism; The drive mechanism includes a motor and a transmission shaft, the transmission shaft being connected to the drive end of the motor to rotate under the drive of the motor; The first floating mechanism includes two cylinders spaced apart along a first direction, and the piston rods of the two cylinders are perpendicular to the first direction. A floating seat is provided in the middle of the two cylinders, and the two sides of the floating seat are respectively connected to the piston rods of the two cylinders, so that the floating seat can swing left and right under the adjustment of the two cylinders. The second floating mechanism includes a connector and a mounting base. The axial direction of the connector is perpendicular to the first direction, and one end of the connector is rotatably connected to the floating base and driven by the drive shaft, so that the connector can rotate under the drive of the drive shaft. The other end of the connector is movably engaged in the mounting base, and the axial mating surface of the connector and the mounting base is a spherical cap surface, so that the mounting base can swing relative to the connector in the circumferential direction. The polishing mechanism includes a clamping disc and a sand disc mounting base arranged opposite to each other. The sand disc mounting base is used to mount the sand disc and tilts the polishing surface of the sand disc at a preset angle. The clamping disc is fixedly connected to the mounting base so that the clamping disc can swing synchronously with the mounting base to keep parallel to the polishing surface. The clamping disc is used to hold the workpiece to be ground and polished, and the clamping disc is provided with a plurality of mounting ports extending through its thickness direction. The mounting ports are used to mount the workpiece to be ground and polished, and the mounting ports are teardrop-shaped. The workpiece to be ground and polished is locked by fasteners abutting against the side of the mounting port toward the tail of its teardrop shape.

2. The two-stage floating power head for metallographic polishing according to claim 1, characterized in that, The other end of the connector is a first connector end. The first connector end and the mating surface of the mounting base have a gap, and both mating surfaces are provided with receiving grooves along the axial direction of the connector. A positioning ball is movably engaged between the two receiving grooves.

3. The two-stage floating power head for metallographic grinding and polishing according to claim 1, characterized in that, The motor is connected to the drive shaft via a pulley drive assembly, and the drive shaft is fixed to a synchronous pulley in the pulley drive assembly via a crossed roller bearing.

4. The two-stage floating power head for metallographic grinding and polishing according to claim 1, characterized in that, One end of the connector is a second connector end, and the second connector end is detachably connected to a connecting sleeve, and is rotatably connected to the floating seat and driven by the connecting sleeve; The drive shaft passes through the floating seat; and... The outer side of the connecting sleeve is rotatably connected to the floating seat via a deep groove bearing; the inner side of the connecting sleeve is drive-connected to the drive shaft passing through the floating seat via a key.

5. The two-stage floating power head for metallographic grinding and polishing according to claim 4, characterized in that, The second connecting end is provided with multiple snap-fit ​​slots spaced apart along its circumference; The connecting sleeve includes a main sleeve, a secondary sleeve, and multiple limiting members; the main sleeve has multiple through grooves corresponding to the multiple snap-fit ​​grooves in its circumferential direction, and the limiting members are movably snapped into the through grooves; the secondary sleeve is sleeved on the outside of the main sleeve, and the secondary sleeve has a push-out portion and a clearance portion sequentially arranged along the axial direction of the main sleeve; and... The secondary sleeve can move along the axial direction of the main sleeve, so that the secondary sleeve has a locked state and an unlocked state; In the locked state, the push-out part can push the limiting member part to engage in the engaging groove of the connector, so that the connector and the connecting sleeve are connected; In the unlocked state, the avoidance part can avoid the limiting member, so that the connector can push the limiting member away from the snap-fit ​​groove and cause the connector to disengage from the connecting sleeve.

6. The two-stage floating power head for metallographic grinding and polishing according to claim 5, characterized in that, A spring is also sleeved between the main sleeve and the auxiliary sleeve. The spring applies a thrust to the auxiliary sleeve so that the push-out part of the auxiliary sleeve can keep pushing the limiting member.

7. The two-stage floating power head for metallographic grinding and polishing according to claim 5, characterized in that, The limiting component is a sphere.

8. The two-stage floating power head for metallographic grinding and polishing according to claim 5, characterized in that, Both the second connecting end and the main sleeve are provided with corresponding pin holes. The axis of the pin hole is perpendicular to the axis of the main sleeve, so that the connecting end and the connecting sleeve can pass through each other via a drive pin after being connected.

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