Automatic Welding Device for Diamond Composite Sheets in Mining Anchor Drill Bits

Abstract

This invention relates to the field of drill bit processing technology, and in particular to an automatic welding device for diamond composite plates in mining anchor drill bits. The device includes a worktable, a clamping fixture on the top of which clamps and fixes the drill bit body. Multiple mounting holes are circumferentially formed on the surface of the drill bit body. The device also includes a mounting base positioned above the worktable and multiple assembly units mounted on the mounting base. Each assembly unit includes a movable ring slidably connected to the mounting base. This invention, through the sequential coordination of the driving clamping assembly, the pushing and pressing assembly, and the yielding assembly, ensures that the arc-shaped limiting plate plays a role in uniformizing the gap during the assembly stage. After the composite plate body is pressed and fixed, it exits the mounting hole, ensuring that the composite plate body remains at the axis of the mounting hole throughout the brazing process and guaranteeing the uniformity of the brazing filler metal filling the gap, thus ensuring welding strength and extending the service life of the drill bit.

Description

Technical Field

[0001] This invention relates to the field of drill bit processing technology, and in particular to an automatic welding device for diamond composite sheets in mining anchor drill bits. Background Technology

[0002] Mining anchor drill bits are key consumables in coal mine roadway support engineering. The front end of the drill bit is inlaid with multiple diamond composite sheets as cutting elements. The diamond composite sheets are made of polycrystalline diamond layers and cemented carbide matrix through high temperature and high pressure sintering, and have extremely high hardness and wear resistance. The connection between the composite sheet and the drill bit steel matrix is ​​usually made by induction brazing: the composite sheet is inserted into the pre-drilled mounting hole on the drill bit matrix, the gap between the two is filled with brazing filler metal, and the brazing filler metal is melted, wetted and filled by induction heating. After cooling, a strong brazed joint is formed.

[0003] Patent document CN220902365U discloses a diamond composite sheet welding device for drill bits, including a working slot, a connecting bearing installed inside the working slot, a support shaft installed inside the connecting bearing, and a mounting column installed at the upper end of the support shaft. The upper part of the mounting column has a fixing through hole, and four sets of fastening bolts are threaded through the inner wall of the fixing through hole. A limiting hole plate is fixedly sleeved on the side wall of the mounting column, and multiple sets of slots are opened on the upper part of the limiting hole plate. Insert plates pass through the interior of each set of slots. Air storage cylinders are fixedly passed through the facing surfaces of each set of insert plates. Plug plates are slidably installed inside each set of air storage cylinders, and connecting rods are installed on the facing surfaces of each set of plug plates.

[0004] In existing production processes, the assembly of composite sheets mainly relies on manual assembly and automatic pressing. Manual assembly involves operators manually placing the composite sheet into the mounting hole; automatic pressing uses a multi-jaw gripper to hold the composite sheet, which is then driven by a cylinder or servo motor to feed it into the mounting hole. Due to the slight ellipticity of the composite sheet itself caused by the sintering process, and the ellipticity and taper tolerances in the machining of the mounting hole, the final radial position of the composite sheet in the mounting hole is uncontrollable regardless of whether manual assembly or automatic feeding is used. After actual assembly, the composite sheet often leans to one side, resulting in a larger circumferential gap on one side and a smaller gap on the other. This uneven gap manifests in subsequent brazing as: the larger gap results in brazing filler metal loss and weak welds, while the smaller gap prevents the brazing filler metal from fully entering or forms an excessively thin weld, ultimately leading to insufficient weld strength. As a result, the drill bit is prone to composite sheet detachment or premature failure during use. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic welding device for diamond composite sheets in mining anchor drill bits.

[0006] To achieve the above objectives, the technical solution adopted by this invention is as follows: an automatic welding device for diamond composite sheets in mining anchor drill bits, comprising a worktable, a clamping fixture on the top of the worktable, a drill bit body clamped and fixed on the top of the clamping fixture, and multiple mounting holes circumferentially formed on the surface of the drill bit body, and further comprising: The mounting base is positioned above the workbench; Multiple assembly units are mounted on the mounting base, and each assembly unit includes: The movable ring is slidably connected to the mounting base; The composite sheet body is located at one end of the movable ring near the clamping fixture; Multiple curved clamping blocks are arranged circumferentially around the periphery of the composite sheet body to clamp the composite sheet body; Arc-shaped limiting pieces are movably mounted on the inner side of each arc-shaped clamping block facing the composite sheet body, and are used to insert into the gap between the composite sheet body and the mounting hole when the arc-shaped clamping blocks are closed. The pressing rod is slidably inserted inside the movable ring and is used to press the composite sheet body axially. The drive clamping assembly is located on the movable ring and is used to drive each arc-shaped clamping block to radially close or open. Multiple push-press components are mounted on the mounting base and are used to drive the press rod to move axially; A clearance component, mounted on the mounting base, is used to drive the movable ring to move backward axially; An active connecting component is disposed between the corresponding arc-shaped clamping block and the arc-shaped limiting piece, which is used to enable the arc-shaped limiting piece to have a floating displacement within a predetermined range relative to the arc-shaped clamping block; The movable assembly component, set on the worktable, is used to drive the mounting base closer to or away from the clamping fixture.

[0007] Preferably, the push-press component includes: The first electric cylinder is fixedly mounted on the mounting base, and its drive shaft extends axially toward the clamping fixture. A limit baffle is fixedly connected to the end of the drive shaft of the first electric cylinder; Multiple first limit pins are slidably inserted into the limit baffle, and one end of the first limit pin is fixedly connected to the end of the pressing rod away from the clamping fixture; The pressure sensor is fixedly installed on the end of the limit baffle near the pressing rod. A plug-in plate is set between the pressing rod and the limiting baffle, and multiple first limiting pins are slidably inserted into the plug-in plate; Multiple first springs are respectively sleeved on multiple first limit pins, and each first spring is fixedly connected between the plug plate and the pressing rod; The spherical protrusion is fixedly connected to the side of the plug plate near the limit baffle and makes elastic contact with the pressure sensor; The controller is electrically connected to the pressure sensor and is used to receive the detection signal from the pressure sensor and control the action of the first electric cylinder according to the signal.

[0008] Preferably, the controller's control logic is as follows: Receive a signal command from the drive clamping component to release the clamping action; A working command is sent to the first electric cylinder to control the extension of the drive shaft of the first electric cylinder, continuously receive feedback signals from the pressure sensor, and read the current pressure value at a preset sampling period; When the pressure reaches the preset target pressure value, a stop feed command is sent to the first electric cylinder, so that the first electric cylinder maintains its current position and enters the pressure holding stage.

[0009] Preferably, when the first electric cylinder enters the pressure-holding stage, the controller's control logic further includes: Receive the start signal of the induction heating device and read the temperature value at a preset sampling period; When the temperature reaches or exceeds the preset solidus temperature of the brazing filler metal, the controller enters the welding pressure holding control mode and collects the pressure value and the axial displacement value of the composite sheet body in real time. The pressure value is compared with the target pressure value: when the pressure value is lower than the target pressure value minus the preset lower pressure limit deviation, the first electric cylinder is controlled to advance slightly forward; when the pressure value is higher than the target pressure value plus the preset upper pressure limit deviation, the first electric cylinder is controlled to retreat slightly backward; when the pressure value is between the two, the first electric cylinder is controlled to maintain the current position. When the displacement value reaches the preset maximum allowable displacement, heating will stop and an alarm signal will be issued; When the temperature drops below the preset cooling safety temperature, the first electric cylinder is controlled to return to its initial position and a welding completion signal is issued.

[0010] Preferably, the drive clamping assembly includes: The positioning ring is fixedly connected to the surface of the movable ring; Multiple sliding grooves are formed on the positioning ring along the circumference. Sliders are slidably connected inside each sliding groove. Multiple arc-shaped clamping blocks are fixedly connected to the corresponding sliders. A rotating ring is rotatably connected to the surface of a movable ring, and the surface of the rotating ring is provided with multiple inclined guide grooves along the circumference. Multiple circular pins are fixedly connected to multiple sliders, and the multiple circular pins are located inside the corresponding inclined guide grooves; The external toothed ring is fixedly connected to the rotating ring; The drive unit is fixedly mounted on the movable ring, and a gear is fixedly connected to the output shaft of the drive unit. The gear meshes with the external gear ring.

[0011] Preferably, the active connection component includes: A strip groove is formed on the inner side of the curved clamping block; Both second limit pins are fixedly connected to the arc-shaped limit piece and slidably inserted into the arc-shaped clamping block; Two second springs are respectively sleeved on the second limiting pins, and the second springs are fixedly connected between the arc-shaped limiting piece and the strip groove.

[0012] Preferably, the yielding component includes: A fixed bracket is securely connected to multiple movable rings; The second electric cylinder is fixedly mounted on the mounting base, and its drive shaft is fixedly connected to the movable ring.

[0013] Preferably, the active assembly components include: The limit guide rail is fixedly connected to the worktable; The movable block is fixedly connected to the mounting base and slidably connected to the limit guide rail; The lead screw is rotatably connected to the limit guide rail and threadedly connected to the movable block; The first motor is fixedly installed on the limit guide rail, and the output shaft of the first motor is fixedly connected to one end of the lead screw.

[0014] Preferably, a second motor is fixedly installed at the bottom of the worktable, and the output shaft of the second motor is fixedly connected to the axis at the bottom of the clamping fixture.

[0015] Preferably, the pressing rod is made of ceramic material.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the sequential coordination of the driving clamping component, the pushing and pressing component, and the yielding component, enables the arc-shaped limiting piece to play a role in uniformizing the gap during the assembly stage. After the composite piece body is pressed and fixed, it exits the mounting hole, ensuring that the composite piece body is always at the axis of the mounting hole during the brazing process and ensuring the uniformity of the brazing filler metal filling the gap, thus guaranteeing the welding strength and extending the service life of the drill bit.

[0017] 2. When the composite sheet body is fully inserted into the mounting hole and cannot move further, the pressing rod stops moving forward due to the reaction force of the composite sheet body. As the first electric cylinder drive shaft extends further, the first spring is compressed, and the spring force gradually increases. This spring force is transmitted to the pressure sensor through the plug plate and the spherical protrusion. The pressure sensor detects the current pressure value in real time and feeds it back to the controller. The controller has a preset target pressure value. When the pressure value fed back by the pressure sensor reaches the target pressure, the controller determines that the composite sheet body has been pressed to the predetermined depth, and then issues a command to stop the feed of the first electric cylinder and maintain the current pressure.

[0018] 3. By monitoring the pressure value in real time, and controlling the first electric cylinder to advance slightly when the pressure is lower than the lower limit, the pressing rod follows the composite piece to maintain constant pressure; ensuring that the composite piece body always maintains close contact with the bottom surface of the mounting hole throughout the melting and solidification process of the brazing filler metal, avoiding the composite piece from rebounding or floating due to pressure drop, and ensuring uniform brazing gap and firm welding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first structure of the present invention; Figure 2 This is a schematic diagram of the second structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the diagram; Figure 4 This is a first schematic diagram of the mating structure of the mounting base, movable ring, and composite sheet body of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B in the diagram; Figure 6 This is a second schematic diagram of the mating structure of the mounting base, movable ring, and composite sheet body of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point C; Figure 8 This is a schematic cross-sectional view of the mounting base, movable ring, and composite sheet body mating structure of the present invention; Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point D; Figure 10 For the present invention Figure 8 Enlarged schematic diagram of the structure at point E in the diagram.

[0020] In the diagram: 1. Workbench; 2. Clamping fixture; 3. Drill bit body; 4. Mounting hole; 5. Mounting base; 6. Movable ring; 7. Composite plate body; 8. Arc-shaped clamping block; 9. Arc-shaped limiting plate; 10. Pressing rod; 11. First electric cylinder; 12. Limiting baffle; 13. First limiting pin; 14. Pressure sensor; 15. Connecting plate; 16. First spring; 17. Spherical protrusion; 18. Positioning ring; 19. Sliding groove; 20. Slider; 21. Rotating ring; 22. Inclined guide groove; 23. Circular pin; 24. External gear ring; 25. Drive unit; 26. Gear; 27. Strip groove; 28. Second limiting pin; 29. ​​Second spring; 30. Fixed bracket; 31. Second electric cylinder; 32. Limiting guide rail; 33. Movable block; 34. Lead screw; 35. First motor; 36. Second motor. Detailed Implementation

[0021] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0022] like Figures 1 to 10 The automatic welding device for diamond composite sheets of mining anchor drill bits shown includes a workbench 1, a clamping fixture 2 on the top of the workbench 1, a drill bit body 3 clamped and fixed on the top of the clamping fixture 2, and multiple mounting holes 4 circumferentially opened on the surface of the drill bit body 3. It also includes: Mounting base 5 is positioned above workbench 1; Multiple assembly units are mounted on the mounting base 5, and each assembly unit includes: The movable ring 6 is slidably connected to the mounting base 5; The composite sheet body 7 is located at one end of the movable ring 6 near the clamping fixture 2; Multiple curved clamping blocks 8 are arranged circumferentially around the composite sheet body 7 to clamp the composite sheet body 7; The arc-shaped limiting piece 9 is movably disposed on the inner side of each arc-shaped clamping block 8 facing the composite sheet body 7, and is used to insert into the gap between the composite sheet body 7 and the mounting hole 4 when the arc-shaped clamping block 8 is closed. The pressing rod 10 is slidably inserted into the movable ring 6 (e.g., ...). Figure 8 and Figure 9 (As shown), used for axially pressing the composite sheet body 7; The drive clamping assembly is set on the movable ring 6 and is used to drive each arc-shaped clamping block 8 to radially close or open. Multiple push-press components are all mounted on the mounting base 5 and are used to drive the pressing rod 10 to move axially. A clearance assembly, mounted on the mounting base 5, is used to drive the movable ring 6 to move axially backward; An active connecting component is disposed between the corresponding arc-shaped clamping block 8 and the arc-shaped limiting piece 9, which is used to enable the arc-shaped limiting piece 9 to have a floating displacement within a predetermined range relative to the arc-shaped clamping block 8. The movable assembly component is set on the worktable 1 and is used to drive the mounting base 5 to move closer to or away from the clamping fixture 2.

[0023] A clamping fixture 2 is fixedly installed on the top of the workbench 1. The clamping fixture 2 is used to clamp and fix the drill bit body 3. Multiple mounting holes 4 are opened on the surface of the drill bit body 3 in the circumferential direction. The inner diameter of the mounting holes 4 is slightly larger than the outer diameter of the composite sheet body 7 to form a fitting gap to accommodate the brazing filler metal. The mounting base 5 is positioned above the workbench 1 and is connected to the workbench 1 via a movable assembly assembly. The movable assembly assembly drives the mounting base 5 to move horizontally, thereby enabling the mounting base 5 to move closer to or further away from the clamping fixture 2. Multiple movable rings 6 are slidably connected to the mounting base 5, and the end of the movable ring 6 closer to the clamping fixture 2 (hereinafter referred to as the front end) is used to mount the composite sheet body 7. The composite sheet body 7 is fixedly installed at the front end of the movable ring 6 and is coaxially arranged with the movable ring 6; the outer diameter of the composite sheet body 7 is adapted to the inner diameter of the mounting hole 4 on the drill bit body 3, and a brazing gap is reserved between the two. The arc-shaped clamping blocks 8 are evenly arranged around the periphery of the composite sheet body 7; the inner surface of each arc-shaped clamping block 8 is an arc surface that matches the outer wall of the composite sheet body 7. The arc-shaped clamping blocks 8 are driven by the driving clamping assembly and can close or open in the radial direction; when the driving clamping assembly drives the arc-shaped clamping blocks 8 to close, the inner surface of each arc-shaped clamping block 8 hugs the composite sheet body 7 from the periphery, thereby clamping and fixing the composite sheet body 7. Arc-shaped limiting pieces 9 are disposed on the inner side of each arc-shaped clamping block 8. The arc-shaped limiting pieces 9 are arc-shaped thin sheets, and their inner arc surfaces are in close contact with the outer wall surface of the composite sheet body 7. The design gap between the composite sheet body 7 and the mounting hole 4 matches the thickness of the arc-shaped limiting pieces 9. When the arc-shaped clamping blocks 8 are closed, the arc-shaped limiting pieces 9 move closer to the composite sheet body 7 along with the arc-shaped clamping blocks 8, and their inner arc surfaces are in close contact with the outer wall of the composite sheet body 7. When the arc-shaped clamping blocks 8 are opened, the arc-shaped limiting pieces 9 move outward and disengage from the composite sheet body 7. The pressing rod 10 is slidably inserted inside the movable ring 6 and is coaxially arranged with the movable ring 6; the front end of the pressing rod 10 faces the end face of the composite sheet body 7, and its rear end is driven by the pushing and pressing assembly; the pushing and pressing assembly can drive the pressing rod 10 to move forward along the axis, thereby pressing the end face of the composite sheet body 7 and pushing the composite sheet body 7 into the mounting hole 4 on the drill bit body 3 to a predetermined depth; This invention, through the sequential coordination of the driving clamping component, the pushing and pressing component, and the yielding component, enables the arc-shaped limiting piece 9 to play a role in uniformizing the gap during the assembly stage, and after the composite piece body 7 is pressed and fixed, it exits the mounting hole 4, ensuring that the composite piece body 7 is always at the axis of the mounting hole 4 during the brazing process and ensuring the uniformity of the brazing filler metal filling the gap, thus ensuring the welding strength and extending the service life of the drill bit.

[0024] As a further embodiment of the present invention, the push-press component includes: The first electric cylinder 11 is fixedly installed on the mounting base 5, and its drive shaft extends axially toward the clamping fixture 2. The limiting baffle 12 is fixedly connected to the end of the drive shaft of the first electric cylinder 11; Multiple first limit pins 13 are slidably inserted on the limit baffle 12, and one end of the first limit pin 13 is fixedly connected to the end of the pressing rod 10 away from the clamping fixture 2; Pressure sensor 14 is fixedly installed on the end of limit baffle 12 near the pressing rod 10; A plug-in plate 15 is disposed between the pressing rod 10 and the limiting baffle 12, and multiple first limiting pins 13 are slidably inserted into the plug-in plate 15. Multiple first springs 16 are respectively sleeved on multiple first limit pins 13, and each first spring 16 is fixedly connected between the plug plate 15 and the pressing rod 10. The spherical protrusion 17 is fixedly connected to the side of the plug plate 15 near the limit baffle 12 and is in elastic contact with the pressure sensor 14. The controller is electrically connected to the pressure sensor 14 and is used to receive the detection signal from the pressure sensor 14 and control the action of the first electric cylinder 11 according to the signal.

[0025] After the drive clamping assembly drives the arc-shaped clamping block 8 to open radially and release the clamping of the composite sheet body 7, the controller controls the drive shaft of the first electric cylinder 11 to extend. At this time, the limit baffle 12, the plug plate 15, the first spring 16, the first limit pin 13 and the pressing rod 10 move forward as a whole. During the movement, the pressing rod 10 abuts against the end face of the composite sheet body 7. The drive shaft of the first electric cylinder 11 continues to extend, causing the pressing rod 10 to drive the composite sheet body 7 to move into the mounting hole 4. When the composite sheet body 7 is completely inside the mounting hole 4 and cannot move, the pressing rod 10 stops moving forward due to the reaction force of the composite sheet body 7. As the drive shaft of the first electric cylinder 11 extends further, the first spring 16 is compressed and the spring force gradually increases. This spring force is transmitted to the pressure sensor 14 through the plug plate 15 and the spherical protrusion 17. The pressure sensor 14 detects the current pressure value in real time and feeds it back to the controller. The controller has a preset target pressure value. When the pressure value fed back by the pressure sensor 14 reaches the target pressure, the controller determines that the composite sheet body 7 has been pressed to the predetermined depth, and then issues a command to stop the feed of the first electric cylinder 11 and maintain the current pressure.

[0026] As a further embodiment of the present invention, the control logic of the controller is as follows: Receive a signal command from the drive clamping component to release the clamping action; A working command is sent to the first electric cylinder 11 to control the extension of the drive shaft of the first electric cylinder 11, continuously receive the feedback signal from the pressure sensor 14, and read the current pressure value at a preset sampling period. When the pressure reaches the preset target pressure value, a stop feed command is issued to the first electric cylinder 11, so that the first electric cylinder 11 maintains its current position and enters the pressure holding stage.

[0027] As a further embodiment of the present invention, when the first electric cylinder 11 enters the pressure holding stage, the control logic of the controller further includes: Receive the start signal of the induction heating device and read the temperature value at a preset sampling period; When the temperature reaches or exceeds the preset solidus temperature of the brazing filler metal, the controller enters the welding pressure holding control mode and collects the pressure value and the axial displacement value of the composite sheet body 7 in real time. The pressure value is compared with the target pressure value: when the pressure value is lower than the target pressure value minus the preset lower pressure limit deviation, the first electric cylinder 11 is controlled to advance slightly forward; when the pressure value is higher than the target pressure value plus the preset upper pressure limit deviation, the first electric cylinder 11 is controlled to retreat slightly backward; when the pressure value is between the two, the first electric cylinder 11 is controlled to maintain the current position. When the displacement value reaches the preset maximum allowable displacement, heating will stop and an alarm signal will be issued; When the temperature drops below the preset cooling safety temperature, the first electric cylinder 11 is controlled to return to its initial position and a welding completion signal is issued.

[0028] Before the composite sheet body 7 enters the mounting hole 4, the staff needs to place brazing filler metal inside the mounting hole 4 in advance. During the induction heating process, the brazing filler metal melts to form liquid brazing filler metal and becomes the filler material of the weld, connecting the composite sheet body 7 and the drill bit body 3 into one piece. When the temperature reaches the solidus temperature of the brazing filler metal, the filler metal begins to melt. When the temperature continues to rise to the liquidus temperature, the filler metal completely melts into a liquid state. Under capillary action, the liquid filler metal flows into the bottom and side gaps between the composite sheet body 7 and the mounting hole 4. As the liquid filler metal flows into the side gaps, the thickness of the filler metal layer on the bottom surface of the composite sheet body 7 gradually decreases. Under the pressure of the pressing rod 10, the composite sheet body 7 undergoes a slight displacement into the mounting hole 4. If the pressing rod 10 remains in a fixed position, the contact pressure between the pressing rod 10 and the composite sheet body 7 will decrease accordingly. When the temperature reaches the solidus temperature of the brazing filler metal, the filler metal begins to melt and shrink in volume. The composite sheet body 7 will undergo a slight displacement inward, causing the pressure of the pressing rod 10 on the composite sheet to decrease. This control logic monitors the pressure value in real time and controls the first electric cylinder 11 to advance slightly when the pressure is below the lower limit, so that the pressing rod 10 follows the composite sheet and maintains constant pressure; it ensures that the composite sheet body 7 always maintains close contact with the bottom surface of the mounting hole 4 during the entire process of brazing and solidification, avoiding the composite sheet from rebounding or floating due to pressure drop, and ensuring uniform brazing gap and firm welding. When the pressure value is higher than the target pressure value plus the upper limit deviation, the first electric cylinder 11 is controlled to retract slightly to release the excess pressure; this prevents abnormal pressure rise caused by thermal expansion or excessive displacement of the composite sheet, and avoids the composite sheet body 7 or diamond layer from cracking due to overpressure.

[0029] As a further embodiment of the present invention, the driving clamping assembly includes: Positioning ring 18 is fixedly connected to the surface of movable ring 6; Multiple sliding grooves 19 are formed on the positioning ring 18 along the circumferential direction. Slider 20 is slidably connected inside each sliding groove 19. Multiple arc-shaped clamping blocks 8 are fixedly connected to the corresponding slider 20. A rotating ring 21 is rotatably connected to the surface of the movable ring 6. Multiple inclined guide grooves 22 are provided on the surface of the rotating ring 21 along the circumference. Multiple circular pins 23 are fixedly connected to multiple sliders 20 respectively, and the multiple circular pins 23 are located inside the corresponding inclined guide grooves 22. The external toothed ring 24 is fixedly connected to the rotating ring 21; The drive unit 25 is fixedly mounted on the movable ring 6. A gear 26 is fixedly connected to the output shaft of the drive unit 25, and the gear 26 meshes with the external gear ring 24.

[0030] When the output shaft of the drive unit 25 drives the gear 26 to rotate in the forward direction, the gear 26 drives the external gear ring 24 and the rotating ring 21 to rotate in the forward direction around the axis of the movable ring 6 through meshing. When the rotating ring 21 rotates, the inclined guide groove 22 rotates accordingly. Under the constraint of the inclined guide groove 22, the circular pin 23 moves along the sliding groove 19 towards the center of the positioning ring 18, driving the slider 20 and the arc-shaped clamping block 8 to move radially inward, realizing the closing of the arc-shaped clamping block 8, thereby clamping the composite sheet body 7. Similarly, when the output shaft of the drive unit 25 rotates in the reverse direction, the multiple arc-shaped clamping blocks 8 open and release the clamping of the composite sheet body 7.

[0031] As a further embodiment of the present invention, the active connection component includes: A strip groove 27 is formed on the inner side of the arc-shaped clamping block 8; The two second limiting pins 28 are both fixedly connected to the arc-shaped limiting piece 9 and slidably inserted into the arc-shaped clamping block 8; Two second springs 29 are respectively sleeved on the second limiting pin 28, and the second springs 29 are fixedly connected between the arc-shaped limiting piece 9 and the strip groove 27.

[0032] When multiple curved clamping blocks 8 are closed, the curved clamping blocks 8 drive the curved limiting piece 9 to approach the composite sheet body 7, so that the curved limiting piece 9 first adheres to the surface of the composite sheet body 7. As the curved clamping blocks 8 continue to move, the curved clamping blocks 8 and the curved limiting piece 9 generate relative displacement, and the curved clamping blocks 8 then adhere to the composite sheet body 7 for clamping. When multiple arc-shaped clamping blocks 8 open simultaneously and release their clamping force on the composite sheet body 7, the arc-shaped limiting piece 9 remains in contact with the surface of the composite sheet body 7 under the elastic force of the second spring 29. Thus, when the arc-shaped clamping blocks 8 release their clamping force on the composite sheet body 7, one end of the arc-shaped limiting piece 9 remains in the gap between the composite sheet body 7 and the inner wall of the mounting hole 4 as an intermediate pad, reducing the frictional resistance when the pressing rod 10 pushes the composite sheet body 7 into the mounting hole 4.

[0033] As a further embodiment of the present invention, the clearance component includes: The fixed bracket 30 is fixedly connected to multiple movable rings 6; The second electric cylinder 31 is fixedly installed on the mounting base 5, and the drive shaft of the second electric cylinder 31 is fixedly connected to the movable ring 6.

[0034] After multiple composite sheet bodies 7 are pressed and fixed, the drive shaft of the second electric cylinder 31 retracts, pulling the fixed bracket 30 and multiple movable rings 6 to move synchronously away from the clamping fixture 2, so that the arc-shaped clamping block 8 and the arc-shaped limiting piece 9 are withdrawn from the mounting hole 4 as a whole.

[0035] As a further embodiment of the present invention, the active assembly component includes: The limit guide rail 32 is fixedly connected to the worktable 1; The movable block 33 is fixedly connected to the mounting base 5 and slidably connected to the limiting guide rail 32; The lead screw 34 is rotatably connected to the limit guide rail 32 and threadedly connected to the movable block 33; The first motor 35 is fixedly mounted on the limit guide rail 32, and the output shaft of the first motor 35 is fixedly connected to one end of the lead screw 34.

[0036] When it is necessary to move the mounting base 5 towards the clamping fixture 2, the output shaft of the first motor 35 rotates in the forward direction, driving the lead screw 34 to rotate synchronously in the forward direction; the lead screw 34 drives the movable block 33 to move linearly along the limit guide rail 32 towards the clamping fixture 2 through the threaded engagement, and the movable block 33 drives the mounting base 5 and the components mounted on it to move forward synchronously, so that the composite sheet body 7 approaches and enters the mounting hole 4.

[0037] As a further embodiment of the present invention, a second motor 36 is fixedly installed at the bottom of the workbench 1 (e.g., ...). Figure 1 As shown), the output shaft of the second motor 36 is fixedly connected to the center of the bottom of the clamping fixture 2.

[0038] After multiple composite sheet bodies 7 are inserted into the mounting holes 4 in the mounting direction of the drill bit body 3 and welded, the output shaft of the second motor 36 drives the clamping fixture 2 to rotate at the corresponding angle, thereby assembling and welding the composite sheet bodies 7 into the mounting holes 4 in the next direction.

[0039] As a further embodiment of the present invention, the pressing rod 10 is made of ceramic material.

[0040] The pressing rod 10 is made of ceramic refractory material, which enables it to work normally in the high temperature environment of brazing, while protecting the precision components at the rear from heat damage and preventing adhesion to the liquid brazing filler metal.

[0041] The working principle of this invention is as follows: The drive clamping assembly drives the arc-shaped clamping block 8 to close and clamp the composite sheet body 7; at this time, the inner arc surface of the arc-shaped limiting piece 9 is in contact with the outer wall of the composite sheet body 7; the clearance assembly drives the movable ring 6 to the forward position, that is, the position where the composite sheet body 7 is close to the mounting hole 4; the movable assembly assembly drives the mounting base 5 to move towards the clamping fixture 2, so that the front end of the composite sheet body 7 enters the mounting hole 4. During this process, the arc-shaped limiting piece 9 enters the mounting hole 4 together with the composite sheet body 7 and is inserted into the gap between the composite sheet body 7 and the inner wall of the mounting hole 4. The drive clamping assembly drives the arc-shaped clamping block 8 to open radially, and the arc-shaped limiting piece 9 moves outward with the arc-shaped clamping block 8, releasing the clamping of the composite sheet body 7. At this time, the composite sheet body 7 and the mounting hole 4 are only filled and limited by multiple arc-shaped limiting pieces 9. The push pressing assembly drives the pressing rod 10 to move axially forward. The front end of the pressing rod 10 presses against the end face of the composite sheet body 7, pushing the composite sheet body 7 further into the mounting hole 4 until the composite sheet body 7 reaches the predetermined depth. At this time, the composite sheet body 7 is held in a fixed position by the friction between it and the mounting hole 4. The moving ring 6 of the clearance component moves axially backward along the sliding connection, so that the arc-shaped clamping block 8 and the arc-shaped limiting piece 9 are moved away from the mounting hole 4 as a whole; then, the induction heating coil (not shown in the figure) heats the area of ​​the mounting hole 4, and the brazing filler melts and flows into the gap between the composite sheet body 7 and the mounting hole 4 by capillary action to form a brazed joint.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An automatic welding device for diamond composite sheets in mining anchor drill bits, comprising a worktable, a clamping fixture on the top of the worktable, a drill bit body clamped and fixed on the top of the clamping fixture, and a plurality of mounting holes circumferentially formed on the surface of the drill bit body, characterized in that... Also includes: The mounting base is positioned above the workbench; Multiple assembly units are mounted on the mounting base, and each assembly unit includes: The movable ring is slidably connected to the mounting base; The composite sheet body is located at one end of the movable ring near the clamping fixture; Multiple curved clamping blocks are arranged circumferentially around the periphery of the composite sheet body to clamp the composite sheet body; Arc-shaped limiting pieces are movably mounted on the inner side of each arc-shaped clamping block facing the composite sheet body, and are used to insert into the gap between the composite sheet body and the mounting hole when the arc-shaped clamping blocks are closed. The pressing rod is slidably inserted inside the movable ring and is used to press the composite sheet body axially. The drive clamping assembly is located on the movable ring and is used to drive each arc-shaped clamping block to radially close or open. Multiple push-press components are mounted on the mounting base and are used to drive the press rod to move axially; A clearance component, mounted on the mounting base, is used to drive the movable ring to move backward axially; An active connecting component is disposed between the corresponding arc-shaped clamping block and the arc-shaped limiting piece, which is used to enable the arc-shaped limiting piece to have a floating displacement within a predetermined range relative to the arc-shaped clamping block; The movable assembly component is set on the worktable and is used to drive the mounting base to move closer to or away from the clamping fixture. The push-press component includes: The first electric cylinder is fixedly mounted on the mounting base, and its drive shaft extends axially toward the clamping fixture. A limit baffle is fixedly connected to the end of the drive shaft of the first electric cylinder; Multiple first limit pins are slidably inserted into the limit baffle, and one end of the first limit pin is fixedly connected to the end of the pressing rod away from the clamping fixture; The pressure sensor is fixedly installed on the end of the limit baffle near the pressing rod. A plug-in plate is set between the pressing rod and the limiting baffle, and multiple first limiting pins are slidably inserted into the plug-in plate; Multiple first springs are respectively sleeved on multiple first limit pins, and each first spring is fixedly connected between the plug plate and the pressing rod; The spherical protrusion is fixedly connected to the side of the plug plate near the limit baffle and makes elastic contact with the pressure sensor; The controller is electrically connected to the pressure sensor and is used to receive the detection signal from the pressure sensor and control the action of the first electric cylinder according to the signal. The controller's control logic is as follows: Receive a signal command from the drive clamping component to release the clamping action; A working command is sent to the first electric cylinder to control the extension of the drive shaft of the first electric cylinder, continuously receive feedback signals from the pressure sensor, and read the current pressure value at a preset sampling period; When the pressure reaches the preset target pressure value, a stop feed command is sent to the first electric cylinder, so that the first electric cylinder maintains its current position and enters the pressure holding stage; When the first electric cylinder (11) enters the pressure holding stage, the controller's control logic also includes: Receive the start signal of the induction heating device and read the temperature value at a preset sampling period; When the temperature reaches or exceeds the preset solidus temperature of the brazing filler metal, the controller enters the welding pressure holding control mode and collects the pressure value and the axial displacement value of the composite sheet body in real time. The pressure value is compared with the target pressure value: when the pressure value is lower than the target pressure value minus the preset lower pressure limit deviation, the first electric cylinder is controlled to advance slightly forward; when the pressure value is higher than the target pressure value plus the preset upper pressure limit deviation, the first electric cylinder is controlled to retreat slightly backward; when the pressure value is between the two, the first electric cylinder is controlled to maintain the current position. When the displacement value reaches the preset maximum allowable displacement, heating will stop and an alarm signal will be issued; When the temperature drops below the preset cooling safety temperature, the first electric cylinder is controlled to return to its initial position and a welding completion signal is issued. The drive clamping assembly includes: The positioning ring is fixedly connected to the surface of the movable ring; Multiple sliding grooves are formed on the positioning ring along the circumference. Sliders are slidably connected inside each sliding groove. Multiple arc-shaped clamping blocks are fixedly connected to the corresponding sliders. A rotating ring is rotatably connected to the surface of a movable ring, and the surface of the rotating ring is provided with multiple inclined guide grooves along the circumference. Multiple circular pins are fixedly connected to multiple sliders, and the multiple circular pins are located inside the corresponding inclined guide grooves; The external toothed ring is fixedly connected to the rotating ring; The drive unit is fixedly mounted on the movable ring, and a gear is fixedly connected to the output shaft of the drive unit. The gear meshes with the external gear ring. The active connection components include: A strip groove is formed on the inner side of the curved clamping block; Both second limit pins are fixedly connected to the arc-shaped limit piece and slidably inserted into the arc-shaped clamping block; Two second springs are respectively sleeved on the second limiting pins, and the second springs are fixedly connected between the arc-shaped limiting piece and the strip groove; The yielding components include: A fixed bracket is securely connected to multiple movable rings; The second electric cylinder is fixedly mounted on the mounting base, and the drive shaft of the second electric cylinder is fixedly connected to the movable ring. The push rod is made of ceramic.

2. The automatic welding device for diamond composite sheets in mining anchor drill bits according to claim 1, characterized in that, The active assembly components include: The limit guide rail is fixedly connected to the worktable; The movable block is fixedly connected to the mounting base and slidably connected to the limit guide rail; The lead screw is rotatably connected to the limit guide rail and threadedly connected to the movable block; The first motor is fixedly installed on the limit guide rail, and the output shaft of the first motor is fixedly connected to one end of the lead screw.

3. The automatic welding device for diamond composite sheets in mining anchor drill bits according to claim 1, characterized in that, A second motor is fixedly installed at the bottom of the worktable, and the output shaft of the second motor is fixedly connected to the axis at the bottom of the clamping fixture.

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