Electric tool output shaft mandrel positioning grinding apparatus

Abstract

The application relates to the technical field of grinding equipment, and particularly discloses an electric tool output shaft mandrel positioning grinding equipment. The electric tool output shaft mandrel positioning grinding equipment comprises a spindle box and a grinding device, the spindle box is provided with a spindle, the spindle is provided with a self-centering clamping mechanism, the grinding device comprises a rack, a first driving device and a second driving device, the rack is provided with a rotating disc through a hollow shaft base, a plurality of sliding grooves are arranged on the rack, sliding seats are arranged in the sliding grooves, hollow guide pins and axles are arranged on the sliding seats, and a grinding wheel and a driven wheel are arranged on the axles; a guide groove matched with the hollow guide pins is arranged on the rotating disc, the rotating disc is driven by the second driving device, and all the driven wheels are driven by the first driving device. When fine grinding is carried out, the grinding wheel simultaneously works around the output shaft mandrel, the circumferential grinding cutting forces on the output shaft mandrel are offset, and the problems of position deviation, bending deformation and machining vibration caused by unilateral force on the output shaft mandrel are avoided, and the fine grinding precision is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and in particular to a power tool output shaft mandrel positioning grinding equipment. Background Technology

[0002] In power tools such as electric drills, angle grinders, and cutting machines, the output spindle is a crucial component of the power transmission system. The surface of the output spindle requires precision assembly of various mating parts, including bearings, transmission gears, and seals. The dimensional accuracy, coaxiality, roundness, and surface finish of each mating section directly determine the power tool's transmission accuracy, operating noise, and service life. Therefore, the outer cylindrical surface of the critical sections of the output spindle must undergo high-precision grinding to meet the assembly accuracy requirements of the mating parts and ensure the long-term stable operation of the power tool.

[0003] Currently, conventional grinding equipment used for precision grinding of output shaft mandrels generally adopts a single-sided, single-wheel grinding structure. Since output shaft mandrels are mostly slender shaft components with insufficient structural rigidity and limited resistance to deformation, they are prone to radial offset, elastic bending, and machining vibration under single-sided grinding loads. This leads to machining defects such as out-of-tolerance roundness, surface ripples, and localized taper deviations, severely affecting the machining accuracy and product yield. To minimize these defects, existing technologies typically employ a double-end clamping method in the main precision grinding process to achieve stable workpiece positioning. However, this clamping method not only complicates the overall equipment structure but also significantly increases the difficulty and time required for workpiece loading and unloading. Furthermore, the double-end clamping structure drastically reduces the working space of the grinding wheel and easily obstructs the workpiece's surface to be machined, making multi-axis continuous grinding impossible. The entire grinding process must be completed through multiple clamping and separate machining operations. This not only further reduces production efficiency, but repeated clamping also causes the accumulation of positioning errors, ultimately significantly reducing the overall machining accuracy of the output shaft mandrel, making it difficult to meet the needs of mass production and high precision. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a power tool output shaft mandrel positioning grinding device.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] A power tool output shaft mandrel positioning grinding device includes a spindle box and a grinding device. A spindle is mounted on the spindle box and a self-centering clamping mechanism is installed at the front end of the spindle.

[0007] The grinding device includes a frame, a rotary table, a first drive unit, and a second drive unit. The frame is located in front of the spindle, and a hollow shaft platform coaxially arranged with the spindle is fixed on the frame. A material passage hole is opened axially inside the hollow shaft platform. The frame has at least two radially distributed grooves at equal angles around the hollow shaft platform. A slide seat is installed in the groove, and a hollow guide pin is fixed on the slide seat. A wheel axle parallel to the spindle is rotatably mounted on the slide seat, and the wheel axle passes through the hollow guide pin and the axes of the two coincide. A grinding wheel and a driven wheel are respectively installed at both ends of each wheel axle. The rotary table is fitted on the hollow shaft platform, and a guide groove is opened on the rotary table to slide with each hollow guide pin. The distance between the guide groove and the axis of the hollow shaft platform gradually changes from one end to the other. When the rotary table rotates, all wheel axles move synchronously and are always rotationally symmetrically distributed with the axis of the hollow shaft platform as the center. The second drive unit is connected to the rotary table for transmission. The first drive unit is equipped with an output wheel, and the output wheel is connected to each driven wheel through an elastic transmission belt.

[0008] In a preferred embodiment, the slide groove is provided with 2 to 4 grooves.

[0009] In a preferred embodiment, the guide groove has a rotationally symmetrical structure with the axis of the hollow shaft as the center.

[0010] In a preferred embodiment, the guide groove extends along a planar spiral line on the disc body of the rotary table.

[0011] In a preferred embodiment, the hollow guide pin is rotatably connected to a wheel axle passing through it.

[0012] In a preferred embodiment, the end of the axle used to mount the grinding wheel is fixedly provided with a mounting base, and the grinding wheel is detachably locked onto the mounting base by fasteners.

[0013] In a preferred embodiment, a plurality of guide wheels for guiding the direction of the elastic transmission belt are rotatably mounted on the frame; further, some of the guide wheels are mounted on the frame via floating tension seats.

[0014] In a preferred embodiment, the rotary table has a disc structure with teeth on its outer peripheral wall; a drive gear is rotatably mounted on the frame, the drive gear meshes with the teeth on the outer peripheral wall of the rotary table, and the drive gear is connected to the second drive device for transmission.

[0015] In a preferred embodiment, the rotary table and the grinding wheel are located on the same side of the slide, while the driven wheel is located on the other side of the slide; the second drive device and the first drive device are arranged on the same side of the frame.

[0016] In a preferred embodiment, the frame is connected to a first protective shell and a second protective shell at its two axial ends respectively. The slide, slide block, driven wheel, rotary table, first drive device and second drive device are located between the first protective shell and the second protective shell. The first protective shell has several elongated holes, and the wheel axle passes through the corresponding elongated holes so that the grinding wheel is located outside the first protective shell. The first protective shell and the second protective shell have through holes adapted to the material through hole. Further, a bushing is installed inside the material through hole. The two axial ends of the bushing are fixedly connected to the first protective shell and the second protective shell respectively. The inner hole of the bushing connects the through holes on the first protective shell and the second protective shell.

[0017] In a preferred embodiment, the self-centering clamping mechanism is a threaded locking sleeve.

[0018] Compared with the prior art, the positioning grinding equipment of the present invention has the following beneficial technical effects:

[0019] 1. The grinding device in this invention has a circumferential synchronous centering adjustment function. During the radial feed process, the grinding wheels are always distributed at equal angles around the output shaft mandrel, and the distance between each grinding wheel and the reference axis of the output shaft mandrel is equal. During the fine grinding process, all grinding wheels are in stable contact with the output shaft mandrel at the same time, and the circumferential grinding cutting forces of the output shaft mandrel cancel each other out, so that the circumferential force of the output shaft mandrel is balanced. This avoids problems such as positional displacement, bending deformation and machining vibration caused by unilateral force on the output shaft mandrel, and significantly improves the machining accuracy of the dimensions, roundness and coaxiality of the key shaft sections of the output shaft mandrel.

[0020] 2. The output shaft mandrel experiences balanced circumferential force during precision grinding, and the combination of multiple grinding wheels provides excellent limiting and constraint. Clamping only one end of the output shaft mandrel is sufficient to meet the precision grinding requirements, significantly simplifying the tooling structure and shortening the clamping operation time. At the same time, it expands the working space of the grinding wheels, reduces the obstruction of the surface to be machined by the fixture, and enables continuous grinding operations of multiple shaft segments to be completed in a single clamping condition, improving processing efficiency and reducing cumulative clamping errors.

[0021] 3. The positioning grinding equipment in this invention adopts multi-wheel synchronous composite grinding operation, which significantly improves cutting efficiency compared with traditional single-wheel grinding equipment and is suitable for the needs of large-scale industrial continuous production.

[0022] 4. Based on the hollow design of the hollow shaft table, the grinding device does not obstruct the axial feed of the output shaft mandrel, expanding the applicable range of the output shaft mandrel length; at the same time, it allows the grinding wheel to be set close to the frame, effectively shortening the wheel and shaft overhang length, reducing the high-speed rotation deflection of the wheel and shaft and the sliding load of the slide block, improving the stability of equipment operation, and significantly reducing the overall axial dimension of the equipment. The structure has a high degree of integration and a compact overall layout, effectively saving the workshop installation area. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the grinding equipment in an embodiment of the present invention.

[0025] Figure 2 This is one of the structural schematic diagrams of the grinding device in an embodiment of the present invention.

[0026] Figure 3 This is the second schematic diagram of the grinding device in an embodiment of the present invention.

[0027] Figure 4 This is one of the schematic diagrams of the mating structure of the grinding wheel, axle, slide block and driven wheel in an embodiment of the present invention.

[0028] Figure 5 This is the second schematic diagram of the mating structure of the grinding wheel, axle, slide block and driven wheel in an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the meshing structure of the frame, rotary table, and drive gear in an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the cooperative structure of the frame, the first driving device, the second driving device, the guide wheel and the slide groove in an embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of the mating structure of the rotary table, hollow guide pin, and wheel axle in an embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram of the cooperative structure of the guide wheel, floating tension seat and frame in an embodiment of the present invention.

[0033] Figure 10 This is an exploded structural diagram of the frame, the first protective shell, and the second protective shell in an embodiment of the present invention.

[0034] Figure 11 This is one of the schematic diagrams of the cooperation structure of the frame, the first protective shell and the second protective shell in an embodiment of the present invention.

[0035] Figure 12 This is a second schematic diagram of the cooperative structure of the frame, the first protective shell, and the second protective shell in an embodiment of the present invention.

[0036] Figure label:

[0037] 1-Machine body; 2-Feed mechanism; 3-Spindle box; 4-Spindle; 5-Self-centering clamping mechanism; 6-Threaded end; 7-Output shaft mandrel; 8-Frame; 9-Grinding wheel; 10-Driving gear; 11-Rotary disc; 12-Guide groove; 13-Hollow shaft platform; 14-Through hole; 15-Second drive device; 16-Output wheel; 17-Driven wheel; 18-Slide; 19-Wheel axle; 20-Slide groove; 21-Guide wheel; 22-First drive device; 23-Hollow guide pin; 24-Mounting seat; 25-Tooth; 26-Elastic transmission belt; 27-Floating tension seat; 28-Through hole; 29-Second protective shell; 30-Bushing; 31-First protective shell; 32-Elongated hole. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Reference Figures 1-8 As shown in the figure, an embodiment of the present invention discloses a power tool output shaft mandrel positioning grinding device, including a machine body 1, on which a spindle box 3 and a grinding device are mounted; at least one of the spindle box 3 and the grinding device is provided with a feed mechanism 2, which can drive the spindle box 3 and the grinding device to move closer or further away from each other to adjust the relative position of the spindle box 3 and the grinding device.

[0040] The spindle box 3 is equipped with a spindle 4, which integrates a power system for driving the spindle 4 to rotate. A self-centering clamping mechanism 5 is fixedly installed at the front end of the spindle 4. The self-centering clamping mechanism 5 is used to clamp and fix the end of the output shaft spindle 7. By relying on the automatic centering function, it ensures that the reference axis of the output shaft spindle 7 coincides with the axis of the spindle 4.

[0041] The grinding device includes a frame 8, a rotary table 11, a first drive device 22 and a second drive device 15 mounted on the frame 8.

[0042] The frame 8 is located in front of the main shaft 4. A hollow shaft platform 13 is fixed on the frame 8. The axes of the hollow shaft platform 13 and the main shaft 4 coincide. The hollow shaft platform 13 is axially open inside, forming a material passage hole 14 for the self-centering clamping mechanism 5 and the output shaft mandrel 7 to be processed to pass through axially. The frame 8 is provided with at least two sliding grooves 20, preferably two to four. These sliding grooves 20 are radially distributed at equal angles around the hollow shaft platform 13. A slide seat 18 is slidably assembled in each sliding groove 20. A hollow guide pin 23 with a cylindrical structure is fixed on each slide seat 18. Meanwhile, each slide 18 is rotatably fitted with a wheel axle 19 through which it passes. The wheel axle 19 extends in the same direction as the main shaft 4. The wheel axle 19 passes through the corresponding hollow guide pin 23, and the axes of the two coincide. A grinding wheel 9 is fixedly installed at one end of the axial direction of each wheel axle 19, and a driven wheel 17 is fixedly installed at the other end. All grinding wheels 9 are coplanar and have the same specifications, and all driven wheels 17 are coplanar and have the same specifications.

[0043] The rotary disk 11 is rotatably mounted on the hollow shaft platform 13, and the disk surface of the rotary disk 11 is perpendicular to the axis of the hollow shaft platform 13. The disk body of the rotary disk 11 has guide grooves 12 corresponding to the hollow guide pins 23. These guide grooves 12 are rotationally symmetrical about the axis of the hollow shaft platform 13. The guide grooves 12 axially penetrate the rotary disk 11, and the distance between the guide grooves 12 and the axis of the hollow shaft platform 13 gradually changes from one end to the other. Each hollow guide pin 23 extends into the corresponding guide groove 12 and slides with it to form a sliding fit structure. During the rotation of the rotary disk 11, all the slides 18 will move synchronously along the slide grooves 20 due to the transmission action of the guide grooves 12 and the hollow guide pins 23, so that all the wheel axles 19 move synchronously and are always rotationally symmetrical about the axis of the hollow shaft platform 13.

[0044] The second drive device 15 is connected to the rotary table 11, and can drive the rotary table 11 to rotate in a preset direction and angle, thereby driving each set of grinding wheels 9 to feed radially synchronously. By controlling the rotation direction and angle of the rotary table 11, the feed stroke and grinding radius of the grinding wheels 9 can be precisely adjusted. In specific implementation, the rotary table 11 is a low-speed rotating component, and the rotary table 11 and the second drive device 15 can be connected by transmission mechanisms such as synchronous belts, worm gears, and gear transmissions.

[0045] The first drive device 22 is equipped with an output wheel 16 for outputting power. The output wheel 16 is connected to each driven wheel 17 in a closed loop through an elastic transmission belt 26, so that the first drive device 22 can drive all grinding wheels 9 to rotate synchronously. When the position of the slide 18 changes, the driven wheel 17 will generate radial displacement. The elastic transmission belt 26 will achieve adaptive tension compensation by relying on its own elastic deformation, so as to ensure stable transmission between the output wheel 16 and all driven wheels 17.

[0046] Based on the above design, when the positioning grinding equipment of the present invention is used to perform fine grinding on the output shaft mandrel 7, the end of the output shaft mandrel 7 is clamped and fixed by the self-centering clamping mechanism 5, so that the reference axis of the output shaft mandrel 7 is coincident with the axis of the main shaft 4 and the hollow shaft platform 13; the feed mechanism 2 drives the grinding wheel 9 or the output shaft mandrel 7 to feed axially according to the preset parameters, and the second drive device 15 drives the grinding wheel 9 to feed radially according to the preset parameters, so as to perform continuous fine grinding on each shaft section of the output shaft mandrel 7.

[0047] The grinding device in this invention has a circumferential synchronous centering adjustment function. That is, during the radial feed process, the grinding wheels 9 are always distributed at equal angles around the output shaft mandrel 7, and the distance between each grinding wheel 9 and the reference axis of the output shaft mandrel 7 is equal. During the fine grinding process, all grinding wheels 9 are in stable contact with the output shaft mandrel 7 at the same time, and the circumferential grinding load on the output shaft mandrel 7 cancels each other out, so that the circumferential force on the output shaft mandrel 7 is balanced. This avoids problems such as position displacement, bending deformation and processing vibration caused by unilateral force on the output shaft mandrel 7, thereby improving the machining accuracy of the dimensions, roundness and coaxiality of the key shaft sections of the output shaft mandrel 7.

[0048] Reference Figure 6 , Figure 8 As shown, in a preferred embodiment of the present invention, the guide groove 12 extends along a planar helix on the disc body of the rotary disk 11. Based on the geometric characteristics of the planar helix, the rotation angle of the rotary disk 11 can be linearly related to the radial feed of the grinding wheel 9, which is beneficial for quantitative control of the radial grinding feed of the grinding wheel 9 and improves the grinding dimensional accuracy and adjustment consistency.

[0049] Reference Figure 5 , Figure 8 As shown, in a preferred embodiment of the present invention, the hollow guide pin 23 is rotatably connected to the axle 19 passing through it. In this structural design, the hollow guide pin 23 and the slide 18 form an integrated support structure, which can provide more stable support for the axle 19, effectively improve the coaxiality and running stability of the axle 19 during rotation, and enhance the axle 19's ability to withstand grinding loads.

[0050] Reference Figure 4 , Figure 5 As shown, in a preferred embodiment of the present invention, the end of the axle 19 used to mount the grinding wheel 9 is fixedly provided with a mounting base 24, and the grinding wheel 9 is detachably locked onto the mounting base 24 by fasteners. This allows for convenient assembly and disassembly of the grinding wheel 9, effectively reducing the difficulty of later maintenance.

[0051] Reference Figure 3 , Figure 7 , Figure 9As shown, in a preferred embodiment of the present invention, a plurality of guide wheels 21 are rotatably mounted on the frame 8. The guide wheels 21 are used to guide the direction of the elastic transmission belt 26, constrain the winding trajectory of the transmission belt, ensure that the elastic transmission belt 26 has sufficient contact area with the driven wheel 17 and the output wheel 16, and at the same time ensure that the path of the elastic transmission belt 26 avoids the material hole 14.

[0052] Furthermore, in the guide wheel 21, some guide wheels 21 are mounted on the frame 8 via floating tension seat 27, thereby having the function of tension wheel, so as to balance the overall tension of elastic transmission belt 26, adaptively compensate for the change in wheel spacing caused by the displacement of driven wheel 17, reduce the deformation load of elastic transmission belt 26, weaken the dependence on material elasticity index, and improve transmission stability.

[0053] Reference Figure 2 , Figure 6 As shown, in a preferred embodiment of the present invention, the rotary disk 11 is a disc structure with teeth 25 on its outer peripheral wall, so that the rotary disk 11 forms an external toothed disk; a drive gear 10 is rotatably mounted on the frame 8, and the drive gear 10 meshes with the teeth 25 on the outer peripheral of the rotary disk 11 to form a gear transmission pair, and the drive gear 10 is connected to the power output end of the second drive device 15.

[0054] like Figure 2 , Figure 3 As shown, in a preferred embodiment of the present invention, the rotary table 11 and the grinding wheel 9 are located on the same side of the slide 18, while the driven wheel 17 is located on the other side of the slide 18; the second drive device 15 and the first drive device 22 are arranged on the same side of the frame 8; thereby optimizing the overall structural layout of the equipment, improving the integration and space utilization of the equipment, and enhancing the overall compactness of the equipment.

[0055] Reference Figures 10-12 As shown, in a preferred embodiment of the present invention, the frame 8 is provided with a first protective shell 31 and a second protective shell 29 at its two axial ends. The first protective shell 31 and the second protective shell 29 are fixedly connected to the frame 8 by detachable fasteners such as bolts and buckles, forming a sealed protective cavity. The slide groove 20, slide seat 18, driven wheel 17, rotary table 11, first drive device 22 and second drive device 15 are all located in the protective cavity, realizing centralized protection of the transmission components. The first protective shell 31 is provided with an elongated hole 32 corresponding to each wheel axle 19. The wheel axle 19 passes through the elongated hole 32 and can move radially along the elongated hole 32, so that the grinding wheel 9 is located outside the first protective shell 31, ensuring that the grinding operation can be carried out normally. The center positions of the first protective shell 31 and the second protective shell 29 are provided with through holes 28 that are coaxially adapted to the material through hole 14 of the hollow shaft table 13, so as to avoid obstruction or interference to the material through hole 14.

[0056] This protective structure design isolates the core transmission components of the equipment from the external working environment, effectively preventing grinding chips, coolant, dust and external debris from entering the transmission mechanism. At the same time, it prevents personnel from coming into contact with the high-speed rotating transmission components, significantly improving the safety and stability of the equipment operation. The detachable protective shell design facilitates the later inspection and maintenance of the internal transmission components.

[0057] Furthermore, a bushing 30 is coaxially inserted inside the material passage hole 14 of the hollow shaft platform 13. The axial ends of the bushing 30 are fixedly connected to the first protective shell 31 and the second protective shell 29, respectively. The inner hole of the bushing 30 connects the through holes 28 on the first protective shell 31 and the second protective shell 29, forming a continuous through-hole for the workpiece. This bushing 30 structure effectively fills the assembly gap between the first protective shell 31, the second protective shell 29, and the material passage hole 14, further improving the airtightness of the protective cavity and enhancing the protective effect.

[0058] like Figure 1 As shown, in a preferred embodiment of the present invention, the output shaft mandrel 7 of the power tool is typically provided with a threaded end 6 for connecting auxiliary components such as saw blade holders and drill chucks. Based on this structural feature, the self-centering clamping mechanism 5 preferably uses a threaded locking sleeve. Before precision grinding of the output shaft mandrel 7, the threaded end 6 is pre-machined and formed, and a tight connection is achieved between the threaded locking sleeve and the threaded end 6, thereby completing the clamping and positioning of the output shaft mandrel 7. This clamping method is convenient and efficient to operate, can achieve precise positioning of the output shaft mandrel 7, and can effectively avoid the self-centering clamping mechanism 5 from obstructing the surface to be machined, and can continuously complete precision grinding operations on multiple shaft positions.

[0059] In addition, the self-centering clamping mechanism 5 can also be a self-centering chuck. When the end of the output shaft mandrel 7 to be processed is not provided with a threaded structure, the self-centering chuck can be used to clamp and position the output shaft mandrel 7 to adapt to the clamping requirements of output shaft mandrel 7 of different structural types.

Claims

1. A power tool output shaft mandrel positioning grinding device, comprising a spindle box and a grinding device, wherein a spindle is mounted on the spindle box, and a self-centering clamping mechanism is installed at the front end of the spindle; characterized in that: The grinding device includes a frame, a rotary table, a first drive unit, and a second drive unit. The frame is located in front of the spindle, and a hollow shaft platform coaxially arranged with the spindle is fixed on the frame. A material passage hole is opened axially inside the hollow shaft platform. The frame has at least two radially distributed grooves at equal angles around the hollow shaft platform. A slide seat is installed in the groove, and a hollow guide pin is fixed on the slide seat. A wheel axle parallel to the spindle is rotatably mounted on the slide seat, and the wheel axle passes through the hollow guide pin and the axes of the two coincide. A grinding wheel and a driven wheel are respectively installed at both ends of each wheel axle. The rotary table is fitted on the hollow shaft platform, and a guide groove is opened on the rotary table to slide with each hollow guide pin. The distance between the guide groove and the axis of the hollow shaft platform gradually changes from one end to the other. When the rotary table rotates, all wheel axles move synchronously and are always rotationally symmetrically distributed with the axis of the hollow shaft platform as the center. The second drive unit is connected to the rotary table for transmission. The first drive unit is equipped with an output wheel, and the output wheel is connected to each driven wheel through an elastic transmission belt.

2. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: The guide groove has a rotationally symmetrical structure with the axis of the hollow shaft platform as the center.

3. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: The guide groove extends along a planar spiral line on the disc body of the rotary table.

4. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: The rotary table has a disc structure with teeth on its outer peripheral wall; a drive gear is rotatably mounted on the frame, and the drive gear meshes with the teeth on the outer peripheral wall of the rotary table. The drive gear is connected to the second drive device for transmission.

5. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: The rotary table and the grinding wheel are located on the same side of the slide, while the driven wheel is located on the other side of the slide; the second drive device and the first drive device are arranged on the same side of the frame.

6. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: The self-centering clamping mechanism is a threaded locking sleeve.

7. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: The frame is connected to a first protective shell and a second protective shell at its two axial ends respectively. The slide, slide block, driven wheel, rotary table, first drive device and second drive device are located between the first protective shell and the second protective shell. The first protective shell has several elongated holes, and the wheel shaft passes through the corresponding elongated holes so that the grinding wheel is located outside the first protective shell. The first protective shell and the second protective shell have through holes that are adapted to the material passage hole.

8. The power tool output shaft mandrel positioning grinding equipment according to claim 7, characterized in that: A bushing is installed inside the material insertion hole. The two axial ends of the bushing are fixedly connected to the first protective shell and the second protective shell, respectively. The inner hole of the bushing connects the through holes on the first protective shell and the second protective shell.

9. The power tool output shaft mandrel positioning grinding equipment according to claim 1, characterized in that: Several guide wheels for guiding the direction of the elastic transmission belt are rotatably mounted on the frame.

10. The power tool output shaft mandrel positioning grinding equipment according to claim 9, characterized in that: Some of the guide wheels are mounted on the frame via floating tension seats.

Images