A carbide barrel screw and grinding device

Abstract

The present invention relates to the technical field of screw grinding, and discloses a carbide barrel screw and grinding device, comprising a machine base, a screw clamping and rotating mechanism, and a screw grinding mechanism. The screw grinding mechanism comprises a mounting ring, a plurality of grinding units arranged at circumferential intervals around the mounting ring on the inner ring wall of the mounting ring and capable of performing telescopic motion along the radial direction of the mounting ring, and a first control unit arranged in the mounting ring and capable of controlling one or more groups of grinding units to perform synchronous telescopic motion. A limiting unit is provided on one side of the mounting ring for limiting the position of the grinding unit when the grinding unit controlled by the first control unit to perform an extending motion extends to a specified stroke. The grinding unit comprises a telescopic component and a grinding component. The grinding component comprises a top grinding component capable of grinding the top of the thread and a three-in-one grinding component capable of simultaneously grinding the inner surface, outer surface and bottom of the thread. The grinding device can significantly improve the grinding efficiency of the screw.

Description

Technical Field

[0001] The present invention relates to the technical field of screw grinding, in particular to a hard alloy barrel screw and a grinding device. Background Art

[0002] The screw used in injection molding equipment can refer to Figure 10 As shown, it includes a screw body and an external thread arranged on the outer surface of the thread body. After processing, the external thread needs to be ground and polished. The parts of the external thread that need to be ground include the thread top, the thread inner surface, the thread outer surface and the thread bottom. The existing grinding method usually adopts manual grinding. During grinding, the screw needs to be continuously rotated, and the grinding worker grinds while moving along the axial direction of the screw. Grinding is time-consuming and labor-intensive, and the grinding effect is poor.

[0003] Chinese patent publication number CN218533862U discloses a screw grinding device, including a machine base, a first support block and a second support block fixed parallel to the machine base, and a clamping mechanism arranged between the first support block and the second support block for clamping the screw. A fifth motor for driving the clamping mechanism to rotate is provided on the first support block. A grinding mechanism is movable along the axial direction of the screw on the machine base. The grinding mechanism includes a second slider that can be raised and lowered and a grinding wheel rotatably arranged on the second slider. The grinding wheel rotates on the second slider. The rotation of the grinding wheel is controlled by the second motor and is limited by a butterfly stud after the grinding wheel rotates to the required angle.

[0004] The above-mentioned grinding device can only grind one part of the screw at a time, such as the inner surface of the thread or the outer surface of the thread or the thread top or the thread bottom. Therefore, there is still room for improvement in the grinding efficiency. Summary of the Invention

[0005] In view of the disadvantage that the inner surface, outer side surface, thread top and thread bottom of the screw in the prior art need to be polished in sequence, resulting in low polishing efficiency, the first purpose of the present invention is to provide a polishing device that can significantly improve the polishing efficiency of the screw.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A grinding device comprises a machine base, a screw clamping and rotating mechanism and a screw grinding mechanism, wherein the screw grinding mechanism comprises a mounting ring through which the screw can pass and reciprocate along the axial direction of the screw, a plurality of grinding units arranged at intervals on the inner ring wall of the mounting ring and arranged around the circumference of the mounting ring and capable of performing telescopic movement along the radial direction of the mounting ring, and a first control unit arranged in the mounting ring and capable of controlling one or more groups of grinding units to perform synchronous telescopic movement, a limiting unit is arranged on one side of the mounting ring (9) for limiting the position of the grinding unit when the grinding unit controlled by the first control unit to perform an extension movement extends to a specified stroke, the grinding unit comprises a telescopic component and a grinding component fixed on the extended end of each telescopic component and used for grinding different parts of the external thread of the screw, The grinding assembly includes a top grinding assembly that can grind the thread top and a three-in-one grinding assembly that can simultaneously grind the inner surface, outer surface and bottom of the thread. The three-in-one grinding assembly includes a mounting block fixed to the protruding end of the telescopic assembly with the opening facing the screw, a clamping member elastically and telescopically arranged on the inner walls on both sides of the mounting block, and a first grinding member detachably fixed on the side opposite to the clamping member. The first grinding member includes a hard layer, an elastic layer and a grinding layer in sequence from the side close to the clamping member to the side away from it. The elastic layer and the grinding layer extend beyond the hard layer at one end away from the telescopic assembly, and the end where the elastic layer and the grinding layer extend beyond the hard layer is arranged to form a first introduction slope for facilitating the introduction of the thread top.

[0008] With the above solution, the screw clamping and rotating mechanism can adopt the existing technology. The clamped screw has been passed through the mounting ring. At this time, the various grinding units on the mounting ring are in a contracted state, that is, the grinding assembly and the screw thread are in clearance fit. During grinding, the first control unit can be used to control at least one set of three-in-one grinding assemblies and tooth top grinding assemblies to grind the four parts of the thread. The tooth top grinding assembly is in direct contact with the thread tooth top. As the thread rotates and the mounting ring moves along the axial direction of the screw, the thread tooth top can be evenly ground. The three-in-one grinding assembly first uses the first introduction bevel to guide the thread directly from the tooth top to the grinding layer. The advantage of the elastic layer is that it can drive the grinding layer to deform with it to completely elastically fit with the outer surface or inner side of the thread. When the elastic layer and the grinding layer contact the bottom of the thread, the elastic layer can also use its deformation performance to carry the grinding layer to fold relative to the hard layer. The folded part can just wrap around the bottom of the thread. With the movement of the mounting ring and the rotation of the screw, the grinding assembly can uniformly grind the inner surface, outer side and bottom of the thread at the same time. Therefore, the screw grinding mechanism on the grinding device can uniformly grind the thread top, inner surface, outer surface and bottom of the thread at the same time. The operation is simple and the grinding efficiency is significantly improved.

[0009] Preferably, the tooth top grinding assembly includes a telescopic member elastically and telescopically arranged at the protruding end of the telescopic assembly and a second grinding member detachably fixed to the end of the protruding end of the telescopic member. The second grinding member also includes a hard layer, an elastic layer and a grinding layer in sequence from close to the telescopic member to away from the telescopic member. Both sides of the elastic layer and the grinding layer are arranged to form a second introduction slope for facilitating the introduction of the thread top.

[0010] Using the above solution, the second grinding piece of the tooth top grinding assembly also adopts the structural features of an elastic layer combined with a grinding layer. Due to its deformation properties, the elastic layer can completely fit the entire thread top when the grinding layer contacts the thread top. The second guide bevel can ensure that the thread can be introduced to the bottom of the grinding layer and polished by the grinding layer when the screw rotates. This design can improve the coverage performance of grinding.

[0011] Preferably, the tooth top grinding components and the trinity grinding components are arranged in two or more groups at intervals around the circumference of the mounting ring, and the grinding mesh count of each grinding layer is different.

[0012] With the above solution, the grinding process is a process of continuous refinement. As the grinding level increases, the mesh count of the grinding layer continues to increase. Therefore, by setting multiple groups with different grinding mesh counts, the four parts of the thread can be multi-level ground to improve the grinding quality.

[0013] Preferably, the telescopic assembly includes a first groove recessed in the inner ring wall of the mounting ring, a telescopic rod telescoped in the first groove, and a first elastic member arranged in the first groove for driving the telescopic rod to be in a partially extended state.

[0014] With the above solution, the telescopic rod extends partially at the action portion of the first elastic member, thereby enabling the grinding assembly to contact the threads of the screw, and thus being adaptable to screws of different sizes.

[0015] Preferably, the first control unit includes a first electromagnet fixed to the bottom of the first groove, and a receiving groove for accommodating the first elastic member is recessed at one end of the telescopic rod close to the bottom of the first groove. The two ends of the first elastic member are respectively fixedly connected to the first electromagnet and the telescopic rod, and the extension and retraction of the telescopic rod is controlled by the power supply or de-powering of the first electromagnet.

[0016] With the above solution, when the first electromagnet is energized, it attracts the telescopic rod and retracts it from the screw; when the first electromagnet is de-energized, the telescopic rod is partially extended under the action of the first elastic member and drives the grinding assembly connected to the end of the telescopic rod to cooperate with the thread of the screw. Each first electromagnet is independently arranged on a circuit, and the controller can selectively control one or more first electromagnets to switch between energization and de-energization.

[0017] Preferably, the limiting unit includes teeth and grooves arranged at intervals on the side wall of the telescopic rod along its movement direction, and an engaging tooth member telescopically arranged on the side wall of the mounting ring, which can be partially extended and engaged with the teeth and groove of the telescopic rod and disengaged from the teeth and groove of the telescopic rod after retraction, and the extension and retraction of the engaging tooth member is controlled by the second control unit.

[0018] By adopting the above solution, the limiting unit utilizes the engagement of the telescopic meshing tooth piece with the tooth groove on the telescopic rod to limit the telescopic rod. The advantage is that during grinding, the grinding deviation of the grinding layer on the thread will not increase due to the extension and contraction of the telescopic rod, thereby improving the grinding quality.

[0019] Preferably, the second control unit includes an assembly ring with a mounting groove fixed on one side of the mounting ring and a second electromagnet fixed at the bottom of the mounting groove. The meshing tooth part is retracted in the mounting groove and a second elastic part is provided between the meshing tooth part and the bottom of the mounting groove, with both ends fixedly connected to the two. A through groove is provided on the mounting ring for the meshing tooth part to pass through and enter the first groove. The extension and retraction of the meshing tooth part is controlled by the power on or off of the second electromagnet.

[0020] By adopting the above scheme, the second electromagnet can be connected in series to the same circuit or be independently set on a circuit. When the second electromagnet is energized, the meshing tooth part retracts and the telescopic rod can move; when the second electromagnet is de-energized, the meshing tooth part partially extends and engages with the tooth groove, limiting the movement of the telescopic rod.

[0021] Preferably, the meshing tooth part is a meshing tooth block or a meshing tooth ring. When the meshing tooth part is a meshing tooth block, the number of second electromagnets set is consistent with the number of telescopic rods set; when the meshing tooth part is a meshing tooth ring, one second electromagnet is set and distributed in a ring shape.

[0022] Preferably, the screw clamping and rotating mechanism includes a fixed seat arranged parallel to the machine base and a movable seat that can move closer to or away from the fixed seat, a three-jaw chuck rotatably arranged on the fixed seat, and a pressing piece rotatably arranged on the movable seat and having a slot for partial insertion of the tip of the screw, and the screw is clamped between the three-jaw chuck and the pressing piece.

[0023] Using the above solution, the three-jaw chuck clamps one end of the screw, and the tip of the screw is pressed into the slot of the pressing piece. When the three-jaw chuck rotates, it can drive the screw to rotate. The pressing piece is set on the movable seat, and the adjustment of the position of the movable seat can be suitable for clamping screws of different lengths.

[0024] The second object of the present invention is to provide a cemented carbide barrel screw, comprising a screw body and an external thread provided on the screw body, wherein the external thread is ground by the above-mentioned grinding device.

[0025] Due to the adoption of the above technical scheme, the present invention has significant technical effects: the grinding device can clamp and drive screws of different lengths and diameters to rotate, and use the screw grinding device to quickly grind the screw thread. The clamped screw has been passed through the mounting ring. At this time, the various grinding units on the mounting ring are in a contracted state, that is, the grinding assembly and the screw thread are in a clearance fit. During grinding, the first control unit can be used to control at least one set of three-in-one grinding assemblies and tooth top grinding assemblies to grind four parts of the thread. The tooth top grinding assembly is in direct contact with the thread tooth top. As the thread rotates and the mounting ring moves along the axial direction of the screw, the thread tooth top can be evenly ground. The three-in-one grinding assembly First, use the first guide bevel to guide the thread from the top directly to the grinding layer. The advantage of the elastic layer is that it can drive the grinding layer to completely elastically fit with the outer surface or inner side of the thread as it deforms. When the elastic layer and the grinding layer contact the thread bottom, the elastic layer can also use its deformation performance to carry the grinding layer to fold relative to the hard layer. The folded part can just wrap the thread bottom. With the movement of the mounting ring and the rotation of the screw, the grinding assembly can uniformly grind the inner surface, outer side and thread bottom of the thread at the same time. Therefore, the screw grinding mechanism on the grinding device can uniformly grind the thread top, inner surface, outer surface and thread bottom of the thread at the same time, which is simple to operate and significantly improves the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a top view of a grinding device according to this embodiment;

[0027] Figure 2 yes Figure 1 AA cross-sectional view;

[0028] Figure 3 yes Figure 2 A magnified view of A;

[0029] Figure 4 This is a front view of the screw grinding mechanism of this embodiment;

[0030] Figure 5 yes Figure 4 Cross-sectional view of BB;

[0031] Figure 6 yes Figure 5 An enlarged view of B;

[0032] Figure 7 yes Figure 5 Cross-sectional view of CC;

[0033] Figure 8 yes Figure 7 An enlarged view of C;

[0034] Figure 9 yes Figure 7 Enlarged view of D;

[0035] Figure 10 This is an axonometric view of a carbide barrel screw that has been polished by the polishing device of this embodiment. The parts indicated by the numbers in the above figures are as follows: 1. Machine base; 2. Fixed base; 3. Bearing base; 4. Moving base; 5. Second screw rod; 6. Second guide rod; 7. Three-jaw chuck; 8. Pressing member; 801. Slot; 9. Mounting ring; 901. Guide hole; 902. Threaded groove; 903. First groove; 10. Dust cover; 11. First guide rod; 12. First screw rod; 13. Second motor; 14. First motor; 15. Assembly ring; 151. Mounting groove; 16. Mounting block; 161. Third groove; 162. Fourth elastic member; 17. Telescopic rod; 171. Accommodating groove; 18. First elastic member; 19. First electromagnet; 20. Tooth groove; 21. Engaging tooth member; 22. Second electromagnet; 23. Second elastic member; 24. Telescopic member; 25. Hard layer; 26. Elastic layer; 27. Insert block; 28. Screw; 29. Third elastic member; 30. Second groove; 31. Clamping member; 32. Polishing layer; 33. First lead-in bevel; 34. Screw body; 35. External thread; 351. Inner surface of thread; 352. Outer surface of thread; 353. Thread top; 354. Thread bottom; 36. Third motor; 37. Second lead-in bevel. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0037] Example

[0038] A grinding device, referring to Figures 1-9 As shown, it includes a machine base 1, a screw clamping and rotating mechanism, and a screw grinding mechanism.

[0039] Reference Figure 1-Figure 2 As shown, the screw clamping and rotating mechanism includes a fixed base 2 and a movable base 4 which are arranged parallel to the upper end surface of the machine base 1. The fixed base 2 is fixed on the machine base 1, and the movable base 4 can approach or move away from the fixed base 2. The approach or distance of the movable base 4 is controlled by the first driving mechanism. A three-jaw chuck 7 is rotatably provided on the fixed base 2. The rotation of the three-jaw chuck 7 is controlled by the first motor 14 fixed in the fixed base 2. A pressing piece 8 is rotatably provided on the side of the movable base 4 close to the fixed base 2. The end of the pressing piece 8 is provided with a slot 801 for the tip of the screw to be inserted. The slot 801 is arranged in a conical shape and can be suitable for partial insertion of the tip of the screw with different tapers.

[0040] The first driving mechanism includes a first guide rod 11 and a first screw rod 12 arranged in parallel. The first guide rod 11 passes through the movable seat 4 and its two ends are respectively rotatably engaged with the fixed seat 2 and the mounting seat fixed on the end of the machine base 1 away from the fixed seat 2. The first screw rod 12 is located below the first guide rod 11 and is threadedly engaged with the movable seat 4. The two ends of the first screw rod 12 are respectively rotatably connected with the fixed seat 2 and the mounting seat. A second motor 13 for driving the first screw rod 12 to rotate is provided in the fixed seat 2. As the second motor 13 rotates forward and backward, the movable seat 4 can be driven close to or away from the fixed seat 2. When the cylindrical section of the screw is clamped by the three-jaw chuck 7, the movable seat 4 can approach until the tip of the screw is inserted into the slot 801 until it is in an interference fit state.

[0041] Reference Figure 4-Figure 9As shown, the screw grinding mechanism includes a mounting ring 9 for the screw to pass through and to reciprocate along the axial direction of the screw between the fixed seat 2 and the movable seat 4. The movement of the mounting ring 9 is controlled by a second driving mechanism. The second driving mechanism includes a bearing seat 3 provided on both sides of the fixed seat 2 and the mounting seat on the machine base 1. Guide holes 901 and thread grooves 902 are symmetrically provided on both sides of the mounting ring 9. A second guide rod 6 is passed through the guide hole 901. A second screw rod 5 is matched with the thread groove 902. Both ends of the second guide rod 6 and the second screw rod 5 are engaged with the bearing seats 3 located at both ends of the machine base 1. The rotation of the second screw 5 is controlled by a third motor 36 fixed to a bearing seat 3. Six groups of grinding units that can perform telescopic movement along the radial direction of the mounting ring 9 are arranged on the inner ring wall of the mounting ring 9 at axial intervals around the mounting ring 9. The grinding unit includes a telescopic component and a grinding component fixed on the protruding end of each telescopic component for grinding different parts of the screw external thread 35. The telescopic component includes a second groove 30 recessed in the inner ring wall of the mounting ring 9, a telescopic rod 17 telescopic in the first groove 903, and a driving member arranged in the first groove 903 for driving the telescopic rod 17 is a first elastic member 18 in a partially extended state. The first elastic member 18 is a spring. A first control unit that can control the synchronous extension and retraction of one or more grinding units is provided in the mounting ring 9. The first control unit includes a first electromagnet 19 fixed to the bottom of the first groove 903. One end of the telescopic rod 17 near the bottom of the first groove 903 is recessed with a receiving groove 171 that can accommodate the first elastic member 18. The two ends of the first elastic member 18 are fixedly connected to the first electromagnet 19 and the telescopic rod 17 respectively. The extension and retraction of the telescopic rod 17 is controlled by the power on or off of the first electromagnet 19. When the first electromagnet 19 is energized, it attracts the telescopic rod 17 and the telescopic rod 17 retracts and disengages from the screw; when the first electromagnet 19 is de-energized, the telescopic rod 17 is partially extended under the action of the first elastic member 18 and drives the grinding assembly connected to the end of the telescopic rod 17 to cooperate with the thread of the screw. The energization or de-energization of each first electromagnet 19 is independently controlled by a control circuit, which includes a first electromagnet 19 and a first control switch arranged in series. The first control switch is connected to a controller, and the controller can simultaneously control the opening and closing of one or more first control switches according to demand.

[0042] The grinding assembly includes a top grinding assembly that can grind the thread top 353 and a three-in-one grinding assembly that can simultaneously grind the thread inner surface 351, the thread outer surface 352 and the thread bottom 354. The three-in-one grinding assembly includes a mounting block 16 fixed to the protruding end of the telescopic rod 17 and with the opening facing the screw, a third groove 161 is recessed on the inner walls on both sides of the opening of the mounting block 16, a clamping member 31 is telescopically arranged in the third groove 161, and a fourth elastic member 162 is provided between the bottom of the third groove 161 and the clamping member 31 to drive the clamping member 31 to be in a state of partially extending out of the third groove 161, and a first grinding member is detachably fixed on the side opposite to the clamping member 31, and the first grinding member is moved from the side close to the clamping member 31 to the far side. The side away from it includes a hard layer 25, an elastic part and a polishing layer 32 in sequence. The elastic layer 26 is made of sponge, silicone or rubber. The end of the elastic layer 26 and the polishing layer 32 away from the telescopic component extends beyond the hard layer 25, and the end of the elastic layer 26 and the polishing layer 32 extending beyond the hard layer 25 is set to form a first introduction slope 33 for facilitating the introduction of the thread top 353. The first introduction slope 33 can gradually introduce the external thread 35 from the thread top 353 until the polishing layer 32 contacts the thread bottom 354 and is folded toward the fixed layer.

[0043] The tooth top grinding assembly includes a second groove 30 recessed at the protruding end of the telescopic rod 17, and a telescopic part 24 is telescopically arranged in the second groove 30. A third elastic part 29 is arranged between the bottom of the second groove 30 and the telescopic part 24, and its two ends are fixed to the two and drive the telescopic part 24 to be in a partially extended state. The third elastic part 29 is a spring, and a second grinding part is detachably fixed to the protruding end of the telescopic part 24. The second grinding part also includes a hard layer 25, an elastic part and a grinding layer 32 in sequence from close to the telescopic part 24 to away from the telescopic part 24. The elastic layer 26 is made of sponge, silicone or rubber. The two sides of the elastic layer 26 and the grinding layer 32 are arranged to form a second introduction slope 37 for facilitating the introduction of the thread top 353.

[0044] In order to facilitate the disassembly of the first polishing piece and the second polishing piece, the first polishing piece and the second polishing piece are connected to the clamping piece 31 and the telescopic piece 24 through a detachable structure. The detachable structure includes an insert block 27 protruding from the end of the hard layer 25 away from the elastic layer 26 and can be inserted into the clamping piece 31 or the telescopic piece 24. When the insert block 27 is connected to the clamping piece 31 or the telescopic piece 24, the two are locked by the screw 28. When disassembling, it is only necessary to remove the screw 28 and pull out the insert block 27.

[0045] In this embodiment, two groups of tooth top grinding components are provided, and four groups of three-in-one grinding components are provided. The grinding meshes of the grinding layers 32 of the two groups of tooth top grinding components can be the same or different. The meshes of the grinding layers 32 of the three-in-one grinding components can be all the same or different or distributed differently in pairs. If the grinding meshes are all the same, the replacement frequency of the first grinding piece and the second grinding piece under the single-stage grinding mesh grinding condition can be reduced; if the grinding meshes are all different, the external thread 35 of the screw can be continuously polished in multiple stages without replacing the grinding layer 32, that is, without stopping the machine to replace the grinding layer, thereby improving the grinding efficiency. In the actual production process, the operator can make corresponding adjustments according to the screw production indicators.

[0046] A limiting unit is provided on one side of the mounting ring 9 for limiting the position of the grinding unit when the grinding unit, which is controlled by the first control unit to perform an extending movement, is extended to a specified stroke. The limiting unit includes teeth 20 spaced apart on the side wall of the telescopic rod 17 along its movement direction and a meshing tooth member 21 telescopically arranged on the side wall of the mounting ring 9, which can be partially extended and engaged with the teeth 20 of the telescopic rod 17 and disengaged from the teeth 20 of the telescopic rod 17 after retraction. The extension and retraction of the meshing tooth member 21 is controlled by the second control unit. The second control unit includes an assembly ring 15 with a mounting groove 151 fixed on one side of the mounting ring 9 and a second electromagnet 22 fixed at the bottom of the mounting groove 151. The meshing tooth member 21 is extended and retracted in the mounting groove 151 and has two ends fixedly connected to the meshing tooth member 21 and the bottom of the mounting groove 151. The second elastic member 23 is a spring, and a through groove is provided on the mounting ring 9 for the meshing tooth member 21 to pass through and enter the first groove 903. The extension and retraction of the meshing tooth member 21 is controlled by the power on or off of the second electromagnet 22. The meshing tooth member 21 is a meshing tooth block or a meshing tooth ring. When the meshing tooth member 21 is a meshing tooth block, the number of second electromagnets 22 is consistent with the number of telescopic rods 17. When the meshing tooth member 21 is a meshing tooth ring, one second electromagnet 22 is provided and distributed in a ring shape. The present embodiment adopts a meshing tooth block, and the telescopic rod 17 is limited by the engagement of the telescopic meshing tooth block with the tooth groove 20 on the telescopic rod 17. The advantage is that the grinding deviation of the grinding layer 32 on the thread will not be increased due to the extension and retraction of the telescopic rod 17 during grinding, thereby improving the grinding quality.

[0047] Reference Figure 2-Figure 3 As shown, in order to prevent debris generated by grinding from entering the first screw rod 12 and the first guide rod 11, an elastically retractable dust cover 10 is wrapped around the first screw rod 12 and the second screw rod 5. The dust cover 10 is distributed between the movable seat 4 and the mounting ring 9 and between the mounting ring 9 and the fixed seat 2 to ensure the smooth movement of the movable seat 4. The second screw rod 5 and the second guide rod 6 can also be equipped with a dust cover 10 as needed to ensure the smooth movement of the mounting ring 9.

[0048] The above-mentioned first motor 14, second motor 13, third motor 36, three-jaw chuck 7, first electromagnet 19 and second electromagnet 22 are all connected to a PLC controller. The opening and closing, speed and sequential control of the first motor 14, second motor 13 and third motor 36, the opening and closing of the three-jaw chuck 7, the power on or off of the first electromagnet 19, the power on or off of the second electromagnet 22, etc. are all realized by the existing logic programming of the controller.

[0049] Polishing process:

[0050] 1. Loading:

[0051] 1.1 The movable seat 4 and the mounting ring 9 both move to the end away from the fixed seat 2;

[0052] 1.2 The screw is hoisted between the mounting ring 9 and the fixing seat 2 using a hoisting mechanism;

[0053] 1.3 The three-jaw chuck 7 is opened, and the lifting mechanism inserts the cylindrical section of the screw into the three-jaw chuck 7, and the three-jaw chuck 7 is clamped;

[0054] 1.4 Move the mounting ring 9 to one end close to the fixing base 2;

[0055] 1.5 Move the seat 4 until the tip of the screw is inserted into the pressing piece 8 and the pressing piece 8 presses against the screw;

[0056] 2. Polishing:

[0057] 2.1 Trinity polishing:

[0058] 2.1.1 A set of three-in-one grinding assemblies is selected, and the corresponding first electromagnets 19 of one set are de-energized, while the remaining first electromagnets 19 are energized. The first grinding member of the three-in-one grinding assembly partially elastically extends, and the first guide bevel 33 of the first grinding member presses against the thread crest 353 of the external thread 35 opposite to it. The thread crest 353 at this location is guided along the first guide bevel 33 of the first grinding member into between the two grinding layers 32 of the first grinding member until the grinding layer 32 flips toward the hard layer 25 and the hard layer 25 contacts the screw body 34.

[0059] 2.1.2 The second electromagnet 22 is switched to the de-energized state, limiting the movement of the telescopic rod 17 in the partially extended state in 2.1.1;

[0060] 2.1.3 Start the rotation of the three-jaw chuck 7 and the movement of the mounting ring 9 at the same time, driving the grinding layer 32 to evenly grind the inner surface 351, the outer surface 352 and the bottom 354 of the thread. The number of reciprocating movements of the mounting ring 9 along the screw can be set as required.

[0061] 2.1.4 After polishing is completed, the second electromagnet 22 is switched to the energized state, and all the first electromagnets 19 are switched to the energized state;

[0062] 2.2 Thread top 353 grinding:

[0063] 2.2.1 Select a group of crest grinding assemblies, and de-energize the corresponding first electromagnets 19. The remaining first electromagnets 19 are energized. The second grinding members of this group of crest grinding assemblies are partially elastically extended. The second guide slopes 37 on both sides of the second grinding members can be guided into the thread crests 353 and ensure that the grinding layer 32 can be elastically pressed against the thread crests 353 during grinding.

[0064] 2.2.2 The second electromagnet 22 is switched to the de-energized state, limiting the movement of the telescopic rod 17 in the partially extended state in 2.2.1;

[0065] 2.2.3 Start the rotation of the three-jaw chuck 7 and the movement of the mounting ring 9 at the same time, driving the grinding layer 32 to evenly grind the inner surface 351, the outer surface 352 and the bottom 354 of the thread. The number of reciprocating movements of the mounting ring 9 along the screw can be set as required.

[0066] 2.2.4 After polishing is completed, the second electromagnet 22 is switched to the energized state, and all the first electromagnets 19 are switched to the energized state;

[0067] If multi-stage grinding is required, you can select the Trinity grinding component and the tooth top grinding component with different mesh sizes and repeat the above steps.

[0068] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A grinding device comprising a base (1), a screw clamping and rotating mechanism located at the upper end of the base (1) for clamping a screw and driving it to rotate, and a screw grinding mechanism, characterized in that: The screw grinding mechanism comprises a mounting ring (9) through which the screw can pass and reciprocate along the axial direction of the screw, a plurality of grinding units arranged at intervals on the inner ring wall of the mounting ring (9) around the circumference of the mounting ring (9) and capable of performing telescopic movement in the radial direction of the mounting ring (9), and a first control unit arranged in the mounting ring (9) and capable of controlling one or more groups of grinding units to synchronously extend and retract. A limiting unit is provided on one side of the mounting ring (9) for limiting the position of the grinding unit when the grinding unit controlled by the first control unit to perform an extension movement extends to a specified stroke. The grinding unit comprises a telescopic assembly and a grinding assembly fixed on the extended end of each telescopic assembly and used for grinding different parts of the screw external thread (35). The grinding assembly comprises a tooth top grinding assembly capable of grinding the thread tooth top (353) and a tooth top grinding assembly capable of simultaneously grinding the thread inner surface (351) and the thread outer surface (352). A three-in-one grinding assembly for grinding a surface (352) and a thread bottom (354), the three-in-one grinding assembly comprising a mounting block (16) fixed to the protruding end of the telescopic assembly and with an opening facing the screw, a clamping member (31) elastically and telescopically arranged on the inner walls of both sides of the mounting block (16), and a first grinding member detachably fixed on the side opposite to the clamping member (31), the first grinding member comprising a hard layer (25), an elastic layer (26) and a grinding layer (32) in sequence from the side close to the clamping member (31) to the side away from it, the elastic layer (26) and the grinding layer (32) extending beyond the hard layer (25) at one end away from the telescopic assembly, and the elastic layer (26) and the grinding layer (32) extending beyond the hard layer (25) at one end thereof being arranged to form a first introduction slope (33) for facilitating the introduction of the thread top (353).

2. A grinding device according to claim 1, characterized in that: The tooth top grinding assembly comprises a telescopic member (24) elastically and telescopically arranged at the extended end of the telescopic member and a second grinding member detachably fixed to the extended end of the telescopic member (24). The second grinding member also comprises a hard layer (25), an elastic layer (26) and a grinding layer (32) in sequence from close to the telescopic member (24) to away from the telescopic member (24).

3. A grinding device according to claim 2, characterized in that: The tooth top grinding components and the trinity grinding components are arranged in two or more groups at intervals in the circumferential direction of the mounting ring (9), and the grinding mesh counts of the grinding layers (32) of each group are different.

4. A grinding device according to claim 3, characterized in that: The telescopic assembly comprises a first groove (903) recessed in the inner ring wall of the mounting ring (9), a telescopic rod (17) telescoped in the first groove (903), and a first elastic member (18) arranged in the first groove (903) for driving the telescopic rod (17) to be in a partially extended state.

5. A grinding device according to claim 4, characterized in that: The first control unit includes a first electromagnet (19) fixed to the bottom of the first groove (903); an end of the telescopic rod (17) close to the bottom of the first groove (903) is recessed with a receiving groove (171) for accommodating the first elastic member (18); two ends of the first elastic member (18) are fixedly connected to the first electromagnet (19) and the telescopic rod (17) respectively; and the extension and retraction of the telescopic rod (17) is controlled by the power on or off of the first electromagnet (19).

6. A grinding device according to claim 4, characterized in that: The limiting unit comprises tooth grooves (20) arranged at intervals on the side wall of the telescopic rod (17) along the movement direction thereof, and an engaging tooth member (21) arranged telescopically on the side wall of the mounting ring (9), which can be partially extended and engaged with the tooth groove (20) of the telescopic rod (17) and disengaged from the tooth groove (20) of the telescopic rod (17) after retraction. The extension and retraction of the engaging tooth member (21) is controlled by a second control unit.

7. A grinding device according to claim 6, characterized in that: The second control unit comprises an assembly ring (15) with a mounting groove (151) fixed on one side of the mounting ring (9) and a second electromagnet (22) fixed at the bottom of the mounting groove (151); the meshing tooth member (21) is retracted in the mounting groove (151) and a second elastic member (23) is provided between the meshing tooth member (21) and the bottom of the mounting groove (151) with both ends fixedly connected to the two; a through groove is provided on the mounting ring (9) for the meshing tooth member (21) to pass through and enter the first groove (903); the retraction and expansion of the meshing tooth member (21) is controlled by the power on or off of the second electromagnet (22).

8. A grinding device according to claim 7, characterized in that: The meshing tooth part (21) is a meshing tooth block or a meshing tooth ring. When the meshing tooth part (21) is a meshing tooth block, the number of the second electromagnets (22) is consistent with the number of the telescopic rods (17). When the meshing tooth part (21) is a meshing tooth ring, one second electromagnet (22) is provided and distributed in a ring shape.

9. The grinding device according to claim 1, characterized in that: The screw rod clamping and rotating mechanism comprises a fixed seat (2) arranged parallel to a machine base (1) and a movable seat (4) which can approach or move away from the fixed seat (2), a three-jaw chuck (7) rotatably arranged on the fixed seat (2), and a pressing piece (8) rotatably arranged on the movable seat (4) and having a slot (801) for partially inserting the tip of the screw rod, wherein the screw rod is clamped between the three-jaw chuck (7) and the pressing piece (8).

10. A carbide barrel screw, comprising a screw body (34) and an external thread (35) provided on the screw body (34), characterized in that: The external thread (35) is ground by the grinding device according to any one of claims 1 to 9.

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