A high-precision CNC grinding machine and its working method

Abstract

This invention discloses a high-precision CNC grinding machine and its working method, relating to the field of CNC grinding machine technology. It includes a bed and a frame fixed to the top surface of the bed. The frame includes an L-shaped side plate fixed to one side of the top surface of the bed and a vertical side plate fixed to one end of the L-shaped side plate. A channel for placing grinding tools is formed between the L-shaped side plate and the vertical side plate. The grinding tool includes: a drive wheel, fixedly installed at the top between the L-shaped side plate and the vertical side plate, with a first motor connected to the drive wheel installed on the side of the L-shaped side plate facing away from the vertical side plate; and two sets of adjusting wheels, respectively located at both ends of the channel. A first screw adjusting assembly for driving the two adjusting wheels to move in opposite directions is provided on the side of the L-shaped side plate facing the vertical side plate. This invention can increase the contact area between the abrasive belt and the pipe, thereby increasing the grinding pressure between the abrasive belt and the pipe, thus improving the grinding accuracy and grinding efficiency of the pipe.

Description

Technical Field

[0001] This invention relates to the field of CNC grinding machine technology, and in particular to a high-precision CNC grinding machine and its working method. Background Technology

[0002] CNC grinding machines are machine tools that use CNC technology to grind the surface of workpieces using grinding wheels. Most grinding machines use high-speed rotating grinding wheels for grinding, while a few use other grinding wheels and free abrasives such as oilstones, abrasive belts, etc., including honing machines, ultra-precision machining tools, belt grinders, lapping machines, and polishing machines. Among them, belt grinders use a rapidly moving abrasive belt as the grinding wheel to grind and polish items such as blades and cutting tools. With the rapid development of grinding machine technology, belt grinders have become high-efficiency and low-power precision machining equipment.

[0003] Currently, the abrasive belts in CNC grinding machines consist of abrasive grains and adhesive. Different types and grit sizes of abrasive grains can be used for grinding various materials. The grinding accuracy and surface quality of a grinding machine depend on the grit size of the abrasive belt and the grinding pressure. However, in the current CNC grinding process of tubular parts using abrasive belts, the contact between the tube and the belt is typically achieved by the straight plane of the belt contacting the tube surface, followed by the rotating tube completing the grinding process. This method results in a small contact area between the belt and the tube, leading to low grinding pressure during contact, thus affecting grinding accuracy and efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that the small contact area between the abrasive belt and the pipe leads to low grinding pressure during contact, which in turn affects the grinding accuracy and efficiency. The invention proposes a high-precision CNC grinding machine and its working method.

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

[0006] A high-precision CNC grinding machine includes a bed and a frame fixed to the top surface of the bed. The frame includes an L-shaped side plate fixed to one side of the top surface of the bed and a vertical side plate fixed to one end of the L-shaped side plate. A channel for placing grinding tools is formed between the L-shaped side plate and the vertical side plate.

[0007] The grinding tool includes:

[0008] A drive wheel is fixedly installed on the top between the L-shaped side plate and the vertical side plate, and a first motor connected to the drive wheel is installed on the side of the L-shaped side plate facing away from the vertical side plate.

[0009] The adjusting wheels are provided in two sets, respectively located at both ends of the channel. The L-shaped side plate facing the vertical side plate is provided with a first screw adjusting assembly that drives the two adjusting wheels to move in opposite directions.

[0010] The tension sensing component is located on one side of the drive wheel;

[0011] Two sets of sliding top-tightening wheels are provided, respectively located at both ends between the two adjusting wheels. The L-shaped side plate is also provided with a second lead screw adjusting assembly that drives the two sliding top-tightening wheels to move in opposite directions.

[0012] The sanding belt is connected to the outside of the drive wheel, adjusting wheel, tension sensing assembly, and sliding top tensioning wheel;

[0013] A material holding plate for placing the pipe fittings to be ground is fixed in the middle of the top surface of the bed. Rotary clamping assemblies for clamping the ends of the pipe fittings are provided on both sides of the material holding plate. The top surface of the material holding plate is provided with an arc-shaped groove. One end of each of the two rotary clamping assemblies is provided with a drive telescopic assembly for support. A light sensor is installed between one of the drive telescopic assemblies and one side of one of the sliding clamping wheels. A lifting assembly connecting the two drive telescopic assemblies is slidably installed on the lower top surface of the bed. A control panel for electrically connecting the tension sensing assembly, the first motor, the rotary clamping assembly, the light sensor, the lifting assembly, and the drive telescopic assembly is installed on the outer side of the vertical side plate.

[0014] Preferably, the inner side surface of the L-shaped side plate has two first side slots symmetrically opened in the middle for placing the first lead screw adjustment assembly, and two second side slots symmetrically opened below the two first side slots for placing the second lead screw adjustment assembly. A third side slot for placing the tension sensing assembly is opened diagonally above one of the first side slots and on the surface of the vertical side plate corresponding to the horizontal direction.

[0015] Preferably, the inner surface of the vertical side plate is laterally aligned with the guide grooves of the first side groove and the second side groove, wherein the ends of the adjusting wheel and the sliding top tightening wheel that are away from the vertical part of the L-shaped side plate are both supported in the guide groove.

[0016] Preferably, the tension sensing assembly includes a slider fitted in the third side groove, a sliding rod that slides through the slider, a tensioning wheel rotatably connected between the two sliders, and a tensioning spring sleeved on the outside of the sliding rod. The end of the sliding rod away from the slider is connected to a pressure sensing block fixed to the inner wall of the third side groove. One end of the tensioning spring abuts against the surface of the pressure sensing block, and the pressure sensing block is provided with a pressure sensor electrically connected to the control panel.

[0017] Preferably, a horizontal base plate is fixed below the bed, and a screw is rotatably connected between the middle of the base plate and the top of the bed. The screw is threadedly adapted to the lifting assembly, and a hand-cranked assembly extending to the side of the bed is connected to the bottom end of the screw.

[0018] Preferably, the lifting assembly includes a U-shaped frame slidably connected to both sides of the top surface of the bed and a first electric push rod fixed at both ends of the U-shaped frame. The U-shaped frame has a screw hole in the middle that is adapted to the screw rod, and the first electric push rod is electrically connected to the control panel.

[0019] Preferably, the drive telescopic assembly includes a side support plate fixed to the top of the first electric push rod and a second electric push rod installed on the side of the side support plate facing the material holding plate, wherein the fixed end of the second electric push rod is vertically embedded in the top of the side support plate.

[0020] Preferably, the rotary clamping assembly includes a second motor fixed to the end of one of the second electric push rods and a fixed column fixed to the end of the other second electric push rod. The output shaft of the second motor and the end of the fixed column are both connected to a turntable. A push rod is vertically fixed to the center of one side of the turntable, and a sleeve inserted into a pipe is sleeved on the outside of the push rod. A buffer spring is sleeved on the push rod between the sleeve and the turntable. The inside of the sleeve is provided with multiple wedge blocks, and a clamping block connected to the wedge blocks is sleeved on the outside of the sleeve.

[0021] Preferably, the end of the push rod located inside the sleeve is tapered and corresponds to the inclined side of the plurality of wedge blocks, and a buffer spring is also provided between the wedge blocks and the inner wall of the sleeve. The tightening block is arc-shaped, and the surface of the sleeve has a through groove adapted to the tightening block. A connecting rod passing through the through groove connects the tightening block and the wedge blocks.

[0022] A working method for a high-precision CNC grinding machine includes the following steps:

[0023] S1, Place the pipe fitting in the arc-shaped groove of the material holding plate and determine the radius of the pipe fitting to be ground;

[0024] S2, Adjust the height of the lifting assembly so that the rotating clamping assembly fixed at the top of the lifting assembly is coaxial with the inner cavity of the pipe.

[0025] S3, activate the drive telescopic assembly, which uses two rotating clamping components to clamp and fix both ends of the pipe fitting;

[0026] S4, start the lifting assembly, which drives the clamped pipe to move upward. The top surface of the pipe begins to contact the sanding belt and pushes the sanding belt upward until the pipe shaft corresponds to the sliding clamping wheel shaft. At this time, the light sensor transmits a signal, and the control panel controls the lifting assembly to stop.

[0027] S5, at the same time, when the tension sensing component senses a change in the tension of the sanding belt, it activates the first screw adjustment component to move the two adjustment wheels toward each other by a distance X, and then activates the second screw adjustment component to move the two sliding top tightening wheels by a distance Y, and presses the sanding belt against the sliding top tightening wheel and the pipe fitting;

[0028] S6, start the first motor and the second motor. The first motor drives the sanding belt to rotate, and the second motor drives the pipe to rotate, starting the rapid grinding of the pipe surface.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] This invention features two movable adjusting wheels and a sliding top clamping wheel. A lifting assembly raises the pipe to be ground, ensuring that the pipe is level with the axis of the sliding top clamping wheel during the ascent. As the other two adjusting wheels and the two sliding top clamping wheels move, the grinding process changes from horizontal to arc-shaped, increasing the contact area between the grinding belt and the pipe. This results in greater grinding pressure, improving the grinding accuracy and efficiency of the pipe.

[0031] In addition, during the placement and grinding of the pipe fittings, the distance that the adjusting wheel and sliding top clamping wheel move can be input through the control panel according to the radius of the pipe fittings. This enables the overall grinding of the pipe fittings to be automated without manual adjustment, thereby further improving the overall grinding efficiency.

[0032] Finally, the pipe fitting is placed in the arc-shaped groove of the material holding plate. The two rotating clamping components are driven to rise and fall by the lifting components, and the lifting mechanism is driven to rise and fall by the screw and hand crank components. Thus, when the diameter of the pipe fitting changes, the height of the rotating clamping components can be initially adjusted to ensure that the rotating clamping components are compatible with the pipe fitting and to tighten the pipe fitting, thereby expanding the overall applicability. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a high-precision CNC grinding machine proposed in this invention;

[0034] Figure 2 This is a schematic diagram of the structure of a high-precision CNC grinding machine proposed in this invention from another perspective;

[0035] Figure 3 This is a front view of a high-precision CNC grinding machine proposed in this invention during cross-section.

[0036] Figure 4 This is a cross-sectional view of a high-precision CNC grinding machine proposed in this invention;

[0037] Figure 5 This invention proposes a high-precision CNC grinding machine. Figure 3 Enlarged view of point A in the middle;

[0038] Figure 6 This is a front view of a high-precision CNC grinding machine proposed in this invention;

[0039] Figure 7This is a schematic diagram of the internal structure of the vertical side plate of a high-precision CNC grinding machine proposed in this invention;

[0040] Figure 8 This is a schematic diagram of the lifting assembly structure of a high-precision CNC grinding machine proposed in this invention;

[0041] Figure 9 This is a schematic diagram of the drive telescopic assembly structure of a high-precision CNC grinding machine proposed in this invention;

[0042] Figure 10 This is a cross-sectional view of a rotary clamping assembly for a high-precision CNC grinding machine proposed in this invention;

[0043] Figure 11 This is a schematic diagram of the grinding structure of a high-precision CNC grinding machine proposed in this invention.

[0044] In the diagram: 1. Bed; 2. L-shaped side plate; 3. Vertical side plate; 4. Control panel; 5. First motor; 6. Drive wheel; 7. Adjusting wheel; 8. Tensioning sensor assembly; 9. Sanding belt; 10. Material holding plate; 11. Rotary clamping assembly; 12. Drive telescopic assembly; 13. Lifting assembly; 14. Base plate; 15. Screw; 16. Hand crank assembly; 17. First lead screw adjusting assembly; 18. Sliding clamping wheel; 19. Second lead screw adjusting assembly; 20. Fittings; 81. Tensioning wheel; 82. Slide rod; 83. Pressure sensing block; 84. Tensioning spring; 201. First side groove; 202. Second side groove; 202. Third side groove; 111. Second motor; 112. Turntable; 113. Sleeve; 114. Buffer spring; 115. Top block; 116. Top rod; 117. Wedge block; 118. Connecting rod; 121. Side support plate; 122. Second electric push rod; 131. U-shaped frame; 132. First electric push rod. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Reference Figures 1-4A high-precision CNC grinding machine includes a bed 1 and a frame fixed to the top surface of the bed 1. The frame includes an L-shaped side plate 2 fixed to one side of the top surface of the bed 1 and a vertical side plate 3 fixed to one end of the L-shaped side plate 2. The L-shaped side plate 2 and the vertical side plate 3 are integrally formed, and an opening is provided between the bottom end of the vertical side plate 3 and the bed 1 to facilitate the placement and removal of pipes. A channel for placing grinding tools is formed between the L-shaped side plate 2 and the vertical side plate 3.

[0048] The abrasives include:

[0049] The drive wheel 6 is fixedly installed on the top between the L-shaped side plate 2 and the vertical side plate 3, and a first motor 5 connected to the drive wheel 6 is installed on the side of the L-shaped side plate 2 facing away from the vertical side plate 3. When the first motor 5 rotates, it drives the drive wheel 6 to rotate in the channel.

[0050] Two sets of adjusting wheels 7 are provided, located at both ends of the channel. The L-shaped side plate 2 facing the vertical side plate 3 is provided with a first lead screw adjusting assembly 17 that drives the two adjusting wheels 7 to move in opposite directions.

[0051] Tension sensing component 8 is located on one side of drive wheel 6;

[0052] Two sets of sliding top-tightening wheels 18 are provided, and are respectively located at both ends between the two adjusting wheels 7. The L-shaped side plate 2 is also provided with a second lead screw adjusting assembly 19 that drives the two sliding top-tightening wheels 18 to move in opposite directions.

[0053] The sanding belt 9 is connected to the outside of the drive wheel 6, the adjusting wheel 7, the tension sensing component 8 and the sliding top tensioning wheel 18, and is located in the middle of the channel. So that when the first motor 5 is working, the drive wheel 6 can drive the sanding belt 9 to rotate at high speed around the adjusting wheel 7, the tension sensing component 8 and the sliding top tensioning wheel 18.

[0054] A material holding plate 10 for placing the tube 20 to be ground is fixed in the middle of the top surface of the bed 1. The material holding plate 10 is located in the middle between two sliding clamping wheels 18. Rotary clamping components 11 for clamping the ends of the tube 20 are provided on both sides of the material holding plate 10. The top surface of the material holding plate 10 has an arc-shaped groove. The tube is placed in the arc-shaped groove and can slide to the bottom of the arc-shaped groove, so that the tube is always in the middle of the material holding plate 10. One end of each of the two rotary clamping components 11 is provided with a drive telescopic component 12 for support. A light sensor is installed between one set of drive telescopic components 12 and one side of one of the sliding clamping wheels 18. The light sensor includes a transmitter and a receiver. The devices are respectively installed on one side of the drive telescopic assembly 12 and the side of the sliding computer improved 18. When the drive telescopic assembly 12 rises to the point where the tube 20 is aligned with the axis of the sliding top tensioning wheel 18, the light sensor emits a signal. The lifting assembly 13, which connects the two drive telescopic assemblies 12, is slidably installed on the top surface below the bed 1. The control panel 4, which electrically connects the tension sensing assembly 8, the first motor 5, the rotating top tensioning assembly 11, the light sensor, the lifting assembly 13, and the drive telescopic assembly 12, is installed on the outer side of the vertical side plate 3. The control panel 4 can receive corresponding signals and simultaneously emit control signals. The control panel 4 also has preset programs that allow for data input and adjustment.

[0055] Reference Figures 3-5 Two first side slots 201 for placing the first lead screw adjustment assembly 17 are symmetrically opened in the middle of the inner side of the L-shaped side plate 2. Two second side slots 202 for placing the second lead screw adjustment assembly 19 are symmetrically opened below the two first side slots 201. Here, both the first lead screw adjustment assembly 17 and the second lead screw adjustment assembly 19 are composed of a double-headed lead screw and a servo motor. Both ends of the adjusting wheel 7 and the sliding top tightening wheel 18 are connected to lead screw nut blocks fitted on the double-headed lead screw to ensure that when the double-headed lead screw rotates, the two adjusting wheels 7 move towards each other and the two sliding top tightening wheels 18 move towards each other. A third side slot 203 for placing the tension sensing assembly 8 is opened diagonally above one of the first side slots 201 and on the surface of the vertical side plate 3 corresponding to the horizontal direction. This ensures the stability of the tension sensing assembly 8 when the sand belt 9 is tensioned.

[0056] Reference Figures 3-5The tension sensing assembly 8 includes a slider fitted in the third side groove 203, a sliding rod 82 that slides through the slider, a tension wheel 81 rotatably connected between the two sliders, and a tension spring 84 sleeved on the outside of the sliding rod 82. The end of the sliding rod 82 away from the slider is connected to a pressure sensing block 83 fixed to the inner wall of the second side groove 202. One end of the tension spring 84 abuts against the surface of the pressure sensing block 83, and the pressure sensing block 83 is equipped with a pressure sensor electrically connected to the control panel 4. During the operation of the sanding belt 9, the compression and rebound of the tension spring 84 provide tension for the sanding belt 9. When the bottom of the sanding belt 9 is pushed upward by the tube 20, the overall length of the sanding belt 9 remains unchanged. Therefore, the slider is pushed to squeeze the tension spring 84, and the pressure sensor senses a larger pressure change, thereby determining whether the tube 20 is in contact with the sanding belt 9 when it is moving up and down.

[0057] Reference Figures 4-7 Furthermore, to ensure the stability of the movement of the adjusting wheel 7 and the sliding top-tightening wheel 18, guide grooves corresponding to the first side groove 201 and the second side groove 202 should be horizontally placed on the inner side of the vertical side plate 3. The screw nut blocks at both ends of the adjusting wheel 7 and the sliding top-tightening wheel 18 should fit in the guide grooves so that the ends of the adjusting wheel 7 and the sliding top-tightening wheel 18 away from the vertical part of the L-shaped side plate 2 are both supported in the guide grooves, thereby stabilizing the movement of the adjusting wheel 7 and the sliding top-tightening wheel 18. In order to reduce the friction of the screw nut blocks in the guide grooves, a smooth round rod can be installed in the guide grooves to pass through the screw nut blocks, and the smooth round rod provides support and guidance for them.

[0058] Reference Figures 6-7 A horizontal base plate 14 is fixed below the bed 1. A screw 15 is rotatably connected between the middle of the base plate 14 and the top of the bed 1. The screw 15 is in the center position and is threadedly matched with the lifting assembly 13. The bottom end of the screw 15 is connected to a hand crank assembly 16 extending to the side of the bed 1. The hand crank assembly 16 includes a crank handle, a transmission rod, a rotating shaft, and two bevel gears. The rotating shaft is fixedly connected to the bottom end of the screw 15 and is perpendicular to the transmission rod. The two bevel gears mesh and are respectively installed on the rotating shaft and the transmission rod. The crank handle is connected to the end of the transmission rod and is located on the side of the bed 1 to facilitate rotating the transmission rod by the crank handle, which in turn drives the rotating shaft by the bevel gears, and finally drives the screw 15 to rotate, thereby driving the lifting assembly 13 to lift.

[0059] Reference Figure 8The lifting assembly 13 includes a U-shaped frame 131 slidably connected to both sides of the top surface of the bed 1 and a first electric push rod 132 fixed at both ends of the U-shaped frame 131. The U-shaped frame 131 has a screw hole in the middle that is adapted to the screw 15. The two ends of the U-shaped frame 131 are limited while sliding on the bed 1, so that the U-shaped frame 131 can be raised and lowered when the screw 15 rotates. The first electric push rod 132 is electrically connected to the control panel 4, so that the extension and retraction of the first electric push rod 132 can be controlled by the control panel 4.

[0060] Reference Figure 7 and Figure 9 The drive telescopic assembly 12 includes a side support plate 121 fixed to the top of the first electric push rod 132 and a second electric push rod 122 installed on the side of the side support plate 121 facing the material receiving plate 10. The extension and retraction of the first electric push rod 132 can drive the side support plate 121 to rise and fall. The fixed end of the second electric push rod 122 is vertically embedded in the top of the side support plate 121. Furthermore, the second electric push rod 122 is electrically connected to the control panel 4, enabling the extension and retraction of the second electric push rod 122 to be controlled by the control panel 4.

[0061] Reference Figure 7 and Figures 9-10 The rotary clamping assembly 11 includes a second motor 111 fixed to the end of one of the second electric push rods 122 and a fixing post fixed to the end of the other second electric push rod 122. The output shaft of the second motor 111 and the end of the fixing post are both connected to a turntable 112. A push rod 116 is vertically fixed to the center of one side of the turntable 112, and a sleeve 113 inserted into the tube 20 is sleeved on the outside of the push rod 116. A buffer spring 114 is sleeved on the push rod 116 between the sleeve 113 and the turntable 112. The sleeve 113 has multiple wedge blocks 117 inside, and a clamping block 115 connected to the wedge blocks 117 is sleeved on the outside of the sleeve 113. The second motor 111 is fixedly connected to the turntable 112, and the fixed column is rotatably connected to the turntable 112. Thus, with one second motor 111, the turntable 112 can be driven to rotate, thereby driving the push rod 116 and the sleeve 113 to rotate. When the sleeve 113 and the clamping block 115 clamp the pipe 20, the pipe 20 can be driven to rotate.

[0062] The end of the push rod 116 located inside the sleeve 113 is tapered and corresponds to the inclined side of multiple wedge blocks 117. When the push rod 116 is inserted inward, it can move the wedge blocks 117 closer to the inner wall of the sleeve 113. At the same time, the end of the sleeve 113 away from the turntable 112 is also tapered, which facilitates insertion into the pipe fitting 20. A buffer spring 114 is also provided between the wedge blocks 117 and the inner wall of the sleeve 113. When the wedge blocks 117 are moved by the push rod 116, the buffer spring 114 is compressed, thereby preventing the push rod 116 from moving. When compressed again, the wedge block 117 can be restored by the buffer spring 114. The clamping block 115 is arc-shaped, which can better abut against the inner wall of the pipe fitting 20. The surface of the sleeve 113 has a through groove that matches the clamping block 115. Under normal conditions, the clamping block 115 fits in the through groove to facilitate the insertion of the sleeve 113 into the pipe fitting 20. A connecting rod 118 passing through the through groove connects the clamping block 115 and the wedge block 117. At the same time, a pressure sensor is also installed on the surface of the clamping block 115 that is in contact with the inside of the pipe fitting 20.

[0063] Reference Figures 1-11 A working method for a high-precision CNC grinding machine includes the following steps:

[0064] S1, place the pipe fitting 20 in the arc-shaped groove of the material holding plate 10, and determine the radius of the pipe fitting 20 to be ground;

[0065] S2, adjust the height of the lifting component 13, start the crank of the hand crank component 16, drive the screw 15 to rotate, and then drive the U-shaped frame 131 to rise and fall. When the U-shaped frame 131 rises and falls, it drives the first electric push rod 132 to rise and fall, and then drives the top fixed drive telescopic component 12 to rise and fall, so as to realize that the rotating clamping component 11 and the inner cavity of the pipe 20 are coaxially corresponding or nearly coaxial, so as to facilitate the insertion of the sleeve 113 of the rotating clamping component 11;

[0066] S3, activate the second electric push rod 122 of the drive telescopic assembly 12. The two second electric push rods 122 extend, driving the two rotating clamping assemblies 11 to move toward the pipe fitting 20 until the sleeve 113 is inserted into the pipe fitting 20. When the two turntables 112 contact the side wall of the pipe fitting 20, the second electric push rod 122 continues to extend, and the push rod 116 slides into the sleeve 113 until it contacts the wedge block 117, pushing the wedge block 117. Driven by the connecting rod 118, the clamping block 115 moves toward the surface of the pipe fitting 20 until the pressure sensor on the surface of the clamping block 115 detects that the clamping block 115 is in contact with the pipe fitting 20. The pressure detected by the pressure sensor determines whether it is in contact. The surface of the clamping block 115 is set with a rubber layer to better clamp the pipe fitting 20.

[0067] S4, start the first electric push rod 132 of the lifting assembly 13, and drive the clamped pipe 20 to move upward. The top surface of the pipe 20 begins to contact the sanding belt 9 and continues to push the sanding belt 9 upward until the axis of the pipe 20 corresponds to the axis of the sliding top clamping wheel 18. At this time, the light sensor transmits a signal, and the control panel 4 controls the first electric push rod 132 of the lifting assembly 13 to stop.

[0068] S5, at the same time, when the tension sensing component 8 senses a change in the tension of the sanding belt 9, the control panel 4 starts to activate the first lead screw adjustment component 17, causing the two adjusting wheels 7 to move towards each other by a distance X. Then, the second lead screw adjustment component 19 is activated, causing the two sliding top tensioning wheels 18 to move by a distance Y, so that the sanding belt 9 is pressed between the sliding top tensioning wheels 18 and the pipe fitting 20. Here, the moving distance X = 1 / 2 circumference of the pipe fitting 20 + 1 / 4 circumference of the sliding top tensioning wheel 18, and the moving distance Y = half of (the initial distance between the two sliding top tensioning wheels 18 - the diameter of the pipe fitting 20 - the thickness of the sanding belt 9 * 2).

[0069] S6, start the first motor 5 and the second motor 111. The first motor 5 drives the sanding belt 9 to rotate, and the second motor 111 drives the pipe fitting 20 to rotate, starting to quickly grind the surface of the pipe fitting 20. After grinding is completed, first start the first electric push rod 132 to retract, so that the pipe fitting 20 leaves the sanding belt 9. After returning to the initial position, the control panel 4 controls the first lead screw adjustment assembly 17 and the second lead screw adjustment assembly 19 again to restore the adjusting wheel 7 and the sliding top tightening wheel 18. Finally, retract the second electric push rod 122 to disengage the rotating top tightening assembly 11 from the pipe fitting 20.

[0070] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-precision CNC grinding machine, comprising a bed (1) and a frame fixed to the top surface of the bed (1), characterized in that: The frame includes an L-shaped side plate (2) fixed to one side of the top surface of the bed (1) and a vertical side plate (3) fixed to one end of the L-shaped side plate (2), and a channel for placing the grinding tool is formed between the L-shaped side plate (2) and the vertical side plate (3). The grinding tool includes: The drive wheel (6) is fixedly installed on the top between the L-shaped side plate (2) and the vertical side plate (3), and a first motor (5) connected to the drive wheel (6) is installed on the side of the L-shaped side plate (2) facing away from the vertical side plate (3). Two sets of adjusting wheels (7) are provided, located at both ends of the channel. The L-shaped side plate (2) facing the vertical side plate (3) is provided with a first screw adjusting assembly (17) that drives the two adjusting wheels (7) to move in opposite directions. The tension sensing component (8) is located on one side of the drive wheel (6); Two sets of sliding top-tightening wheels (18) are provided, and are respectively located at both ends between the two adjusting wheels (7). The L-shaped side plate (2) is also provided with a second screw adjusting assembly (19) that drives the two sliding top-tightening wheels (18) to move in opposite directions. A sanding belt (9) is connected to the outside of the drive wheel (6), the adjusting wheel (7), the tension sensing assembly (8), and the sliding top tensioning wheel (18); The top surface of the bed (1) is fixed with a material holding plate (10) for placing the pipe fitting (20) to be ground. Rotary clamping components (11) for clamping the ends of the pipe fitting (20) are provided on both sides of the material holding plate (10). The top surface of the material holding plate (10) is provided with an arc-shaped groove. One end of each of the two rotary clamping components (11) is provided with a drive telescopic component (12) for support. A light sensor is installed between one of the drive telescopic components (12) and one side of one of the sliding clamping wheels (18). A lifting component (13) connecting the two drive telescopic components (12) is slidably installed on the bottom top surface of the bed (1). A control panel (4) for electrically connecting the tension sensing component (8), the first motor (5), the rotary clamping component (11), the light sensor, the lifting component (13) and the drive telescopic component (12) is installed on the outer side of the vertical side plate (3). The inner side of the L-shaped side plate (2) has two first side slots (201) symmetrically opened in the middle for placing the first lead screw adjustment assembly (17), and two second side slots (202) symmetrically opened below the two first side slots (201) for placing the second lead screw adjustment assembly (19). A third side slot (203) for placing the tension sensing assembly (8) is opened diagonally above one of the first side slots (201) and on the surface of the corresponding vertical side plate (3). The inner side of the vertical side plate (3) is laterally corresponding to the guide grooves of the first side groove (201) and the second side groove (202), wherein the end of the adjusting wheel (7) and the sliding top tightening wheel (18) away from the vertical part of the L-shaped side plate (2) is supported in the guide groove; The tension sensing assembly (8) includes a slider fitted in the third side groove (203), a sliding rod (82) that slides through the slider, a tension wheel (81) rotatably connected between the two sliders, and a tension spring (84) sleeved on the outside of the sliding rod (82). The end of the sliding rod (82) away from the slider is connected to a pressure sensing block (83) fixed to the inner wall of the third side groove (203). One end of the tension spring (84) abuts against the surface of the pressure sensing block (83), and the pressure sensing block (83) is provided with a pressure sensor electrically connected to the control panel (4). A horizontal base plate (14) is fixed below the bed (1). A screw (15) is rotatably connected between the middle of the base plate (14) and the top of the bed (1). The screw (15) is threadedly matched with the lifting assembly (13), and a hand crank assembly (16) extending to the side of the bed (1) is connected to the bottom end of the screw (15). The lifting assembly (13) includes a U-shaped frame (131) slidably connected to both sides of the top surface of the bed (1) and a first electric push rod (132) fixed at both ends of the U-shaped frame (131). The U-shaped frame (131) has a screw hole in the middle that is compatible with the screw (15). The first electric push rod (132) is electrically connected to the control panel (4). The drive telescopic assembly (12) includes a side support plate (121) fixed to the top of the first electric push rod (132) and a second electric push rod (122) installed on the side of the side support plate (121) facing the material holding plate (10), with the fixed end of the second electric push rod (122) vertically embedded in the top of the side support plate (121); The rotating clamping assembly (11) includes a second motor (111) fixed to the end of one of the second electric push rods (122) and a fixing column fixed to the end of the other second electric push rod (122). The output shaft of the second motor (111) and the end of the fixing column are both connected to a turntable (112). A push rod (116) is vertically fixed to the center of one side of the turntable (112), and a sleeve (113) inserted into the tube (20) is sleeved on the outside of the push rod (116). A buffer spring (114) is sleeved on the push rod (116) between the sleeve (113) and the turntable (112). The inside of the sleeve (113) is provided with multiple wedge blocks (117), and a clamping block (115) connected to the wedge blocks (117) is sleeved on the outside of the sleeve (113). The end of the top rod (116) located inside the sleeve (113) is tapered and corresponds to the inclined side of the plurality of wedge blocks (117). A buffer spring (114) is also provided between the wedge block (117) and the inner wall of the sleeve (113). The top block (115) is arc-shaped. The surface of the sleeve (113) has a through groove adapted to the top block (115). A connecting rod (118) passing through the through groove is connected between the top block (115) and the wedge block (117).

2. A working method for a high-precision CNC grinding machine, employing the high-precision CNC grinding machine as described in claim 1, characterized in that, Includes the following steps: S1, place the pipe fitting (20) in the arc-shaped groove of the material holding plate (10) and determine the radius of the pipe fitting (20) to be ground; S2, adjust the height of the lifting assembly (13) so that the rotating clamping assembly (11) fixed at the top of the lifting assembly (13) is coaxial with the inner cavity of the pipe fitting (20); S3, start the drive telescopic assembly (12), and the two ends of the pipe fitting (20) are tightened and fixed by the two rotating clamping assemblies (11); S4, start the lifting assembly (13), the lifting assembly (13) drives the clamped pipe (20) to move upward, the top surface of the pipe (20) begins to contact the sanding belt (9), and continues to push the sanding belt (9) upward until the axis of the pipe (20) corresponds to the axis of the sliding top clamping wheel (18). At this time, the light sensor transmits a signal, and the control panel (4) controls the lifting assembly (13) to stop. S5, at the same time, when the tension sensing component (8) senses that the tension of the sanding belt (9) has changed, the first screw adjustment component (17) is activated, so that the two adjusting wheels (7) move towards each other by a distance X. Then the second screw adjustment component (19) is activated, so that the two sliding top tightening wheels (18) move by a distance Y, and the sanding belt (9) is pressed between the sliding top tightening wheel (18) and the pipe fitting (20). S6, start the first motor (5) and the second motor (111). The first motor (5) drives the sanding belt (9) to rotate, and the second motor (111) drives the pipe (20) to rotate, and starts to quickly grind the surface of the pipe (20).

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