Workpiece threaded through hole tapping device

Abstract

The invention relates to the technical field of tapping machining, and particularly discloses a workpiece threaded through hole tapping device which comprises a rack, a fixing assembly, a screw tap, a positioning mechanism and a cleaning mechanism, the positioning mechanism comprises two positioning rods and a driving structure, and the two positioning rods are symmetrically arranged on the two sides of the screw tap and can synchronously rotate along with the screw tap; the driving structure is used for driving the two positioning rods to be close to or away from each other, the two cleaning mechanisms are installed at the lower ends of the two positioning rods respectively, each cleaning mechanism comprises a scraper, a brush and a cleaning rod, the scraper and the brush are longitudinally installed on the lower portion of the positioning rod, the brush is prepared and formed by a flexible material, and the cleaning rod is connected with the scraper. The cleaning rod is horizontally mounted at the lower end of the positioning rod; the screw tap can be accurately positioned, it is ensured that the screw tap and the axis of the through hole are collinear, meanwhile, burrs in the through hole can be removed, generated sweeps are removed in time in the tapping process, and the thread quality and the service life of the screw tap are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of tapping processing, and in particular to a workpiece threaded through-hole tapping device. Background Art

[0002] Tapping is a common machining process, mainly used to produce internal threads in the holes of workpieces. This process is usually completed by cutting or extruding with a tap. A tap usually consists of a cutting part, a calibration part and a shank. The cutting part is responsible for cutting the material to form the thread, usually with a cutting edge and a chip groove; the calibration part is used to calibrate the size and accuracy of the thread; and the shank is used to connect the tap to a tapping machine or other tools.

[0003] The patent document with the authorization announcement number CN118893256B discloses a continuous tapping device for stainless steel nuts, including a main device, on which a pusher device and a clamping device are arranged, the pusher device is used to feed the stainless steel nut to be tapped, and the clamping device is used to clamp the stainless steel nut to be tapped. When in use, the tapping mechanism cooperates with the clamping device to realize continuous tapping of the stainless steel nut, and the switching mechanism switches the direction of the tapping cutter during the retraction process, so that the tapping cutter withdraws along the internal thread of the stainless steel nut, thereby preventing damage to the internal thread and removing excess burrs in the internal thread.

[0004] However, there are still some problems when using a tapping device to tap holes in a workpiece. First, when positioning the tap and the workpiece, the axis of the tap and the through hole of the workpiece may not be fully aligned due to the error of the device, affecting the quality of the thread. Secondly, there may be burrs in the hole on the workpiece. The presence of these burrs will interfere with the cutting process of the tap, resulting in an uneven thread surface and affecting the dimensional accuracy of the thread. At the same time, it will increase the cutting load of the tap, aggravate the wear of the tap, and may even cause the tap to get stuck or break. In addition, during the tapping process, the waste chips generated by the tap cutting may flow out from the upper end of the hole under the impact of the cutting force or the coolant. These waste chips will accumulate at the hole mouth or the thread tooth profile, which will not only interfere with the cutting process again, but also hinder the inflow of coolant, so that the coolant cannot flow smoothly to the cutting area, affecting the cooling effect. Summary of the invention

[0005] The present invention provides a device for tapping a threaded through hole in a workpiece, aiming to solve the problems existing in the tapping device in the related art, such as lack of effective positioning of the tap, difficulty in ensuring that the tap is completely aligned with the axis of the through hole of the workpiece, and affecting the quality of the thread; at the same time, the burrs in the hole are not cleaned before tapping, which may interfere with the cutting process of the tap, affect the thread accuracy, and cause damage to the tap; in addition, during the tapping process, the waste chips generated cannot be cleaned in time, so that the waste chips are easily accumulated on the hole mouth or the thread tooth profile, which again interferes with the cutting process and affects the passage of the coolant.

[0006] The present invention discloses a workpiece threaded through-hole tapping device, comprising a frame, a fixing assembly and a tap, wherein the frame is provided with a fixing station, the fixing assembly is used to fix the workpiece on the fixing station, and further comprises a positioning mechanism and a cleaning mechanism; The positioning mechanism includes two positioning rods and a driving structure. The two positioning rods are symmetrically arranged on both sides of the tap and can rotate synchronously with the tap. The driving structure is used to drive the two positioning rods to move closer to or farther away from each other. When the distance between the two positioning rods is small, the two positioning rods can move downward synchronously and be inserted into the through hole on the workpiece. When the two positioning rods move away from each other and both are in contact with the inner wall of the through hole, the axis of the tap is in line with the axis of the through hole. The cleaning mechanism is set into two groups and is respectively installed at the lower ends of the two positioning rods. Each group of cleaning mechanisms includes a scraper, a brush and a cleaning rod. The scraper and the brush are longitudinally installed at the lower part of the positioning rod. The brush is made of flexible material. When the two positioning rods are away from each other, the scraper and the brush can contact the inner wall of the through hole. The cleaning rod is horizontally installed at the lower end of the positioning rod. When the cleaning rod contacts the surface of the workpiece, the waste chips on the side of the through hole can be cleaned by rotating the positioning rod.

[0007] The workpiece to be processed is placed on a fixed workstation and fixed by a fixing assembly. In the initial state, the distance between the two positioning rods is small, so that when the two positioning rods move downward synchronously, their lower ends can be inserted into the through holes on the workpiece. Then, the two positioning rods are driven away from each other by the driving structure until both positioning rods are in contact with the side walls of the through holes. At this time, the axis of the tap is aligned with the axis of the through hole, so that the tap is accurately positioned to ensure the quality of subsequent threads. When the lower end of the positioning rod is inserted into the through hole, the cleaning mechanism installed at the lower end of the positioning rod is synchronously inserted into the through hole. At this time, the rotation of the tap can drive the two positioning rods to rotate synchronously, so that the side walls of the through holes can be cleaned by the scraper and the brush. After the inner wall of the through hole is cleaned, the two positioning rods are synchronously withdrawn from the through hole, and then the two positioning rods move away from each other to provide enough space for the subsequent downward movement of the tap, and then the two positioning rods move downward again until the cleaning rod installed at the lower end of the positioning rod contacts the surface of the workpiece, so that in the subsequent tapping process, the cleaning rod can be driven to rotate around the side of the through hole through the rotation of the positioning rod, and the waste chips generated can be cleaned in time to avoid the accumulation of waste chips on the side of the through hole and interfere with the cutting process again, so as to ensure the smooth progress of the tapping process and the smooth introduction of coolant.

[0008] Preferably, the frame is provided with an adjustment component for adjusting the position of the tap, the adjustment component includes a sliding plate and a lifting plate, the frame is provided with a horizontal slide rail, the sliding plate horizontally slides with the frame through the horizontal slide rail, the sliding plate is provided with a vertical slide rail, the lifting plate longitudinally slides with the sliding plate through the vertical slide rail, the tap is installed on the lifting plate, and the lifting plate is provided with a driving member 1 for driving the tap to move up and down, and a driving member 2 for driving the tap to rotate.

[0009] Preferably, a protective part is installed at the lower end of the lifting plate, and the lower end of the protective part is open. The protective part includes a fixed part and a rotating part. The fixed part is fixedly connected to the lifting plate by a connecting rod. As the lifting plate moves downward, the lower end of the fixed part can contact the surface of the workpiece. The fixed part is formed by a flexible material, and an infusion tube for conveying coolant is installed on the frame. The water outlet end of the infusion tube passes through the fixed part. The rotating part is rotatably installed at the upper end of the fixed part, the positioning rod slides through the rotating part, and the rotating part is provided with a through opening for the tap to pass through.

[0010] The effect is that, through the setting of the protective part, a sealed protective space can be formed around the through hole to be processed, so that the waste chips generated and the coolant introduced during the tapping process can be effectively confined in the protective space, preventing the waste chips and coolant from splashing to other areas on the surface of the workpiece, thereby avoiding the subsequent impact on the processing of other through holes.

[0011] Preferably, a driving member four is provided on the lifting plate, the output end of the driving member four extends vertically downward and is connected to a mounting plate, each positioning rod is relatively fixed to the mounting plate in the longitudinal direction and slides with the mounting plate in the horizontal direction.

[0012] Preferably, the mounting plate includes an outer ring and an inner circular plate, the outer ring is connected to the output end of the driving member 4, the inner circular plate is rotatably mounted on the middle part of the outer ring, a slide groove is longitudinally provided on the shank of the tap, the inner circular plate is longitudinally slidably matched with the shank of the tap through the slide groove, two symmetrical guide grooves are provided on the inner circular plate, and two positioning rods are respectively slidably provided in the corresponding guide grooves.

[0013] The effect is that the tap and the positioning rod can be rotated synchronously through the sliding cooperation between the inner circular plate and the tap, and the sliding cooperation between the positioning rod and the inner circular plate, and the longitudinal movement freedom between the tap and the positioning rod is retained, ensuring the smooth progress of the tapping process and the positioning process.

[0014] Preferably, a distance sensor is provided on the mounting plate to monitor the horizontal movement distance of the positioning rod.

[0015] The effect is that, when the two positioning rods move away from each other, the adjusting component can accurately adjust the tap according to the distance data monitored by the distance sensor, thereby ensuring the accurate positioning of the tap.

[0016] Preferably, the driving structure includes a driving member five, a driving plate and a guide member, the driving member five is mounted on the lifting plate, the driving plate is connected to the output end of the driving member five, and a through hole for the tap to pass through is provided in the middle of the driving plate, the guide member is provided at the lower end of the driving plate, and a slope one is provided on the circumferential side of the guide member, the slope one is inclined from top to bottom toward the direction close to the tap, the upper end of each positioning rod is provided with a slope two matched with the slope one, and the slope one and the slope two can be in sliding contact, and an elastic member for driving the positioning rod to reset is provided between each positioning rod and the inner circular plate.

[0017] Preferably, the fixing assembly includes a splint and a driving member three, wherein two splints are provided and are respectively arranged on both sides of the fixing station, and the driving member three is arranged on the frame for driving the splint to move, and an inclined plane three is provided on the opposite sides of the two splints, and the inclined plane three is inclined from bottom to top toward the direction close to the other splint.

[0018] Preferably, positioning pieces are provided at the four corners of the fixed station, each positioning piece includes two positioning plates, the two positioning plates in the same group are respectively located at two adjacent sides of the fixed station, and each positioning plate is inclined from bottom to top in a direction away from the fixed station.

[0019] The effect is that when the workpiece to be processed is placed on a fixed station, the workpiece can be guided by the positioning member so that the workpiece automatically moves to the center of the fixed station to cooperate with the fixed component to clamp the workpiece and ensure the stability of the workpiece.

[0020] Preferably, the protective element is made of a transparent material.

[0021] The beneficial effects of the present invention are: 1. The present invention is provided with a positioning mechanism. In the initial state, the distance between the two positioning rods is small. At this time, the two positioning rods move downward synchronously, so that the lower ends of the positioning rods can be inserted into the through holes on the workpiece. Then, the two positioning rods are driven away from each other by the driving structure until the two positioning rods are in contact with the side walls of the through holes. At this time, the axis of the tap is just aligned with the axis of the through hole, thereby realizing accurate positioning of the tap and ensuring the quality of subsequent threads.

[0022] 2. The present invention is provided with a cleaning mechanism. When the lower end of the positioning rod is inserted into the through hole, the cleaning mechanism will move synchronously into the through hole. When the two positioning rods are away from each other, the scraper and the brush will contact the side wall of the through hole. At this time, the rotation of the two positioning rods can drive the scraper and the brush to rotate synchronously, and the burrs in the through hole are scraped off, ensuring the smooth progress of the subsequent cutting process, thereby ensuring the quality of the thread and the service life of the tap; in addition, during the tapping process, when the cleaning rod contacts the surface of the workpiece, the rotation of the positioning rod can drive the cleaning rod to rotate synchronously, and the waste chips on the side of the through hole are cleaned in time to avoid the accumulation of waste chips at the through hole and interfere with the cutting process again, so as to ensure the smooth progress of the tapping process and the smooth passage of the coolant.

[0023] 3. The present invention is provided with a protective member. When the lower end of the protective member contacts the surface of the workpiece, a sealed protective space can be formed on the side around the through hole, so that the waste chips generated and the coolant introduced during the tapping process can be confined in the protective space and will not splash to other areas on the surface of the workpiece, thereby avoiding affecting the subsequent processing of other through holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a side view of the present invention.

[0026] Figure 3 It is a schematic diagram of the assembly structure of the positioning mechanism and the cleaning mechanism of the present invention.

[0027] Figure 4 It is a schematic diagram of the positioning mechanism of the present invention when performing positioning.

[0028] Figure 5It is a structural schematic diagram of the positioning mechanism of the present invention.

[0029] Figure 6 It is a schematic diagram of the assembly structure of the positioning rod and the driving structure of the present invention.

[0030] Figure 7 It is a schematic diagram of the assembly structure of the positioning rod and the mounting plate of the present invention.

[0031] Figure 8 It is a schematic diagram of the cleaning rod of the present invention cleaning the peripheral side of the through hole.

[0032] Fig. 9 It is a schematic diagram of the assembly structure of the positioning rod and the protective member of the present invention.

[0033] Fig.10 It is a schematic structural diagram of the protective element of the present invention.

[0034] Reference numerals: 1. Frame; 100. Horizontal slide rail; 11. Tap; 111. Slide groove; 12. Infusion tube; 13. Sliding plate; 131. Vertical slide rail; 14. Lifting plate; 15. Clamping plate; 16. Positioning plate; 17. Cylinder one; 18. Motor; 19. Cylinder two; 2. Positioning rod; 21. Driving member four; 22. Mounting plate; 221. Outer ring; 222. Inner circular plate; 223. Guide groove; 23. Driving member five; 24. Driving plate; 25. Guide member; 26. Elastic member; 31. Scraper; 32. Brush; 33. Cleaning rod; 4. Protective member; 41. Fixed part; 42. Rotating part; 43. Connecting rod. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] like Figures 1 to 10 As shown, a workpiece threaded through-hole tapping device of the present invention comprises a frame 1, a fixing assembly, a tap 11, an infusion tube 12, a positioning mechanism and a cleaning mechanism.

[0037] A fixed station is provided on the frame 1, and the fixed assembly is used to fix the workpiece to be processed on the fixed station. The tap 11 is installed on the frame 1, and can process the required internal thread in the through hole of the workpiece by rotary cutting. The infusion tube 12 is installed on the frame 1, and can deliver coolant to the cutting area to reduce the cutting temperature and improve the cutting efficiency. The positioning mechanism is used to accurately position the tap 11 to ensure that the axis of the tap 11 is colinear with the axis of the through hole to be processed, thereby achieving accurate positioning of the tap 11 and laying the foundation for the operation of the subsequent cleaning mechanism. The cleaning mechanism is installed on the positioning mechanism, and can clean the inside of the through hole while positioning, avoiding the presence of burrs in the through hole and interfering with the cutting process of the tap 11. In addition, the cleaning mechanism can also clean the side of the through hole during the processing process, avoiding the accumulation of waste chips at the hole mouth and affecting the introduction of coolant or the cutting process, thereby ensuring the processing accuracy.

[0038] like Figures 1 to 3 As shown, in order to adjust the position of the tap 11, an adjustment component is provided on the frame 1, and the adjustment component includes a sliding plate 13 and a lifting plate 14. A horizontal slide rail 100 is provided on the frame 1, and the sliding plate 13 slides horizontally with the frame 1 through the horizontal slide rail 100 to adjust the position of the tap 11 in the horizontal direction. A vertical slide rail 131 is provided on the sliding plate 13, and the lifting plate 14 slides longitudinally with the sliding plate 13 through the vertical slide rail 131 to adjust the position of the tap 11 in the vertical direction. The tap 11 is installed on the lifting plate 14, and a driving member 1 for driving the tap 11 to move up and down, and a driving member 2 for driving the tap 11 to rotate are installed on the lifting plate 14.

[0039] In this embodiment, the driving member 1 is set as a cylinder 17, and the handle of the tap 11 is connected to the output end of the cylinder 17 to realize the longitudinal movement of the tap 11. The driving member 2 is set as a motor 18, and the lifting plate 14 is rotatably mounted with a gear 1 and a gear 2, and the gear 1 and the gear 2 are meshed and transmitted, the gear 1 is connected to the output end of the motor 18, and the gear 2 is longitudinally slidably sleeved on the outside of the handle of the tap 11 to realize the rotational movement of the tap 11. Through the coordinated work of the driving member 1 and the driving member 2, the cutting process of the tap 11 can be realized.

[0040] like Figures 1 to 4As shown, the fixing assembly includes a clamping plate 15 and a driving member 3. The clamping plates 15 are provided in two numbers and are respectively provided on both sides of the fixed station for clamping the workpiece. The driving member 3 is provided on the frame 1. The driving member 3 can be provided as two cylinders 2 19, which are used to independently drive the corresponding clamping plates 15 to move, so as to clamp or loosen the workpiece. The two clamping plates 15 are provided with an inclined plane 3 on the opposite side, and the inclined plane 3 is inclined from bottom to top toward the direction close to the other clamping plate 15. In this way, the workpiece can be clamped in the horizontal direction, and a downward force can be applied to the workpiece in the vertical direction, so that the workpiece is firmly pressed on the fixed station to prevent the workpiece from sliding up and down or tilting during the tapping process.

[0041] like Figures 3 to 8 As shown, the positioning mechanism includes two positioning rods 2 and a driving structure. The two positioning rods 2 are symmetrically arranged on both sides of the tap 11 and can rotate synchronously with the tap 11. The driving structure is used to drive the two positioning rods 2 to move closer to or away from each other. When the distance between the two positioning rods 2 is small, the two positioning rods 2 are moved downward synchronously, and the lower ends of the two positioning rods 2 can be synchronously inserted into the through holes on the workpiece. Then the two positioning rods 2 move away from each other until both positioning rods 2 contact the inner wall of the through hole. At this time, the axis of the tap 11 is collinear with the axis of the through hole, thereby realizing the positioning of the tap 11.

[0042] like Figures 3 to 5 As shown, in order to achieve the synchronous up and down movement of the two positioning rods 2, a driving member 21 is provided on the lifting plate 14, and the driving member 21 can be a cylinder, an electric push rod, etc. The output end of the driving member 21 extends vertically downward and is connected to the mounting plate 22, which can achieve the up and down movement of the mounting plate 22. Each positioning rod 2 is relatively fixed to the mounting plate 22 in the longitudinal direction to ensure that the positioning rod 2 can move up and down synchronously with the mounting plate 22. Each positioning rod 2 is slidably matched with the mounting plate 22 in the horizontal direction, allowing the positioning rod 2 to be adjusted in the horizontal direction while maintaining synchronous up and down movement.

[0043] Among them, a distance sensor is provided on the mounting plate 22, which can monitor the horizontal movement distance of the positioning rod 2. Specifically, the distance sensor can monitor the horizontal movement distance of the positioning rod 2 in real time, and feed back the monitored data to the control system. The control system adjusts the position of the tap 11 accordingly through the adjustment component according to the received distance data, so as to ensure that when both positioning rods 2 are in contact with the inner wall of the through hole, the monitored data are consistent, so as to ensure that the tap 11 corresponds to the center position of the through hole. In addition, the distance sensor can be used in conjunction with the drive structure to achieve precise control of the positioning rod 2. When the distance sensor detects that the positioning rod 2 reaches the predetermined position, it can trigger the drive structure to stop moving, thereby ensuring the smooth progress of the positioning process and the cleaning process.

[0044] like Figures 3 to 7As shown, the driving structure includes a driving member 5 23, a driving plate 24 and a guide member 25. The driving member 5 23 is installed on the lifting plate 14. The driving member 5 23 can be a cylinder, an electric push rod, etc. The driving plate 24 is connected to the output end of the driving member 5 23. The middle part of the driving plate 24 is provided with a through hole for the tap 11 to pass through, allowing the tap 11 to pass through for tapping operations. The guide member 25 is arranged at the lower end of the driving plate 24. The peripheral side of the guide member 25 is provided with an inclined surface 1. The inclined surface 1 is inclined from top to bottom toward the direction close to the tap 11. The upper end of each positioning rod 2 is provided with an inclined surface 2 that matches the inclined surface 1, and the inclined surface 1 and the inclined surface 2 can slide in contact, pushing the two positioning rods 2 away from each other, and realizing contact positioning with the inner wall of the through hole. An elastic member 26 is provided between each positioning rod 2 and the inner circular plate 222. The elastic force direction of the elastic member 26 is the same as the sliding direction of the positioning rod 2. The elastic member 26 can be a compression spring, which can maintain a small distance between the two positioning rods 2 when the positioning rod 2 is not subject to force, so as to facilitate its insertion into the through hole.

[0045] Specifically, when it is necessary to tap the workpiece, the driving plate 24 is controlled to move upward by the driving member 5 23. At this time, the two positioning rods 2 will be in a close state under the action of the elastic member 26, which is convenient for inserting the positioning rod 2 into the through hole of the workpiece. Then, the driving plate 24 is controlled to move downward by the driving member 5 23, so that the inclined surface 1 on the guide member 25 contacts the inclined surface 2 at the upper end of the positioning rod 2. As the driving plate 24 continues to move downward, the two positioning rods 2 gradually separate until they are in close contact with the inner wall of the through hole. At this time, the axis of the tap 11 remains in line with the axis of the through hole to achieve precise positioning. After the tapping is completed, the driving member 5 23 controls the driving plate 24 to move upward. Under the action of the elastic member 26, the two positioning rods 2 automatically reset and approach each other, which is convenient for removing the positioning rod 2 from the through hole.

[0046] like Figures 4 to 8 As shown, the cleaning mechanism is set to two groups and is respectively installed at the lower ends of the two positioning rods 2. Each group of cleaning mechanisms includes a scraper 31, a brush 32 and a cleaning rod 33. The scraper 31 and the brush 32 are longitudinally installed at the lower part of the positioning rod 2. When the positioning rod 2 contacts the inner wall of the through hole, the scraper 31 and the brush 32 can contact the inner wall of the through hole. Among them, the scraper 31 can be made of cemented carbide material, which has sufficient rigidity and wear resistance and can effectively scrape off the harder burrs in the through hole. The brush 32 is made of flexible material and can adapt to the slight unevenness of the inner wall of the through hole to ensure the comprehensiveness of the cleaning. The cleaning rod 33 is horizontally installed at the lower end of the positioning rod 2. When the cleaning rod 33 contacts the surface of the workpiece, the waste chips on the side of the through hole can be cleaned by rotating the positioning rod 2.

[0047] like Figures 3 to 7As shown, in order to realize the rotation of the positioning rod 2, the mounting plate 22 includes an outer ring 221 and an inner circular plate 222. The outer ring 221 is connected to the output end of the driving member 21, and the inner circular plate 222 is rotatably mounted in the middle of the outer ring 221, so that the inner circular plate 222 can rotate freely in the outer ring 221, providing a basis for the synchronous rotation of the tap 11 and the positioning rod 2. A sliding groove 111 is longitudinally provided on the handle of the tap 11, and the inner circular plate 222 is longitudinally slidably matched with the handle of the tap 11 through the sliding groove 111. Two symmetrical guide grooves 223 are provided on the inner circular plate 222, and the two positioning rods 2 are slidably arranged in the corresponding guide grooves 223 respectively. Through the sliding cooperation between the inner circular plate 222 and the tap 11, and the sliding cooperation between the positioning rod 2 and the inner circular plate 222, the synchronous rotation of the positioning rod 2 and the tap 11 is realized, while the longitudinal movement freedom of each component is retained, simplifying the device structure.

[0048] like Figure 1 , Figure 3 , Fig. 9 and Fig.10 As shown, a protective member 4 is installed at the lower end of the lifting plate 14, and the lower end of the protective member 4 is open. The protective member 4 includes a fixed portion 41 and a rotating portion 42. The fixed portion 41 is fixedly connected to the lifting plate 14 through a connecting rod 43. As the lifting plate 14 moves downward, the lower end of the fixed portion 41 can contact the surface of the workpiece to form a closed protective space around the through hole to be processed. The fixed portion 41 is made of a flexible material, such as silicone, soft plastic or flexible rubber. These materials have good elasticity and sealing properties and can form an effective seal when in contact with the surface of the workpiece. The water outlet end of the infusion tube 12 is set through the fixed portion 41 to ensure that the coolant can be smoothly transported to the cutting area to ensure the cooling effect. The rotating portion 42 is rotatably installed at the upper end of the fixed portion 41, and the positioning rod 2 slides through the rotating portion 42, and the rotating portion 42 is provided with a through hole for the tap 11 to pass through, to ensure the normal positioning operation and tapping operation. By providing the protective member 4, the waste chips generated and the coolant introduced during the tapping process are confined in the protective space and will not splash to other areas on the workpiece surface, thereby avoiding affecting the subsequent processing of other through holes. At the same time, it can also effectively protect the operator from being harmed by the splashing waste chips and coolant.

[0049] The protective member 4 is made of a transparent material, which is convenient for the operator to observe the tapping process in real time, and promptly discover and deal with possible problems, such as the tap 11 being stuck, poor thread quality, etc. At the same time, the transparent protective member 4 is also convenient for the operator to check the flow of the coolant to ensure the cooling effect, thereby ensuring the smooth progress of the tapping operation.

[0050] like Figures 1 to 4As shown, positioning members are provided at the four corners of the fixed station, and each positioning member includes two positioning plates 16. The two positioning plates 16 of the same group are respectively located at two adjacent sides of the fixed station, and each positioning plate 16 is inclined from bottom to top in a direction away from the fixed station. When the workpiece is placed at the fixed station, the four groups of positioning members will guide the workpiece at the same time, so that the workpiece automatically slides to the center position of the fixed station to ensure the accurate positioning of the workpiece on the fixed station. Among them, the positioning plate 16 is slidably mounted on the frame 1 to accommodate workpieces of different sizes.

[0051] The working process of the tapping device of the present invention is as follows: first, the workpiece to be processed is placed on the fixed station, and then the workpiece is firmly fixed on the fixed station by the fixing assembly. At this time, the two positioning rods 2 of the positioning mechanism maintain a small distance in the initial state, and when the driving member 21 is started and the mounting plate 22 is driven to move downward, the two positioning rods 2 can be driven to move downward synchronously, so that the lower ends of the positioning rods 2 are inserted into the through holes on the workpiece.

[0052] After the positioning rod 2 is inserted into the through hole, the driving member 5 23 is started to drive the driving plate 24 and the guide member 25 to move downward, so that the inclined surface 1 on the guide member 25 contacts the inclined surface 2 on the upper end of the positioning rod 2. At this time, the driving plate 24 continues to move downward, which can push the two positioning rods 2 away from each other. In this process, according to the distance data of the positioning rod 2 movement monitored by the distance sensor, the position of the lifting plate 14 is adjusted by the adjustment component until both positioning rods 2 contact the side wall of the through hole. At this time, since the two positioning rods 2 are symmetrically arranged on both sides of the tap 11, the axis of the tap 11 is collinear with the axis of the through hole, so that the tap 11 can be accurately positioned.

[0053] Then start the motor 18 to drive the gear 1 to rotate, and under the meshing transmission of the gear 1 and the gear 2, drive the gear 2 and the tap 11 to rotate. Since the handle of the tap 11 is longitudinally slidably matched with the inner circular plate 222, the inner circular plate 222 will be driven to rotate accordingly, and the two positioning rods 2 will be driven to rotate at the same time. At this time, the scraper 31 and the brush 32 installed at the lower end of the positioning rod 2 can contact the side wall of the through hole to scrape and clean the burrs in the through hole, providing a good through-hole environment for the subsequent tapping process.

[0054] After the cleaning of the inside of the through hole is completed, the driving member 21 is started to drive the mounting plate 22 to move upward, and the two positioning rods 2 to move upward synchronously, so that the lower ends of the positioning rods 2 are withdrawn from the through hole. Then the driving member 23 is started to drive the driving plate 24 and the guide member 25 to continue to move downward, so that the two positioning rods 2 continue to move away from each other, so that there is enough space between the two positioning rods 2 for the tap 11 to move downward; then the driving member 21 is started to drive the two positioning rods 2 to move downward, so that the cleaning rod 33 installed at the lower end of the positioning rod 2 contacts the surface of the workpiece.

[0055] Then, the driving member 1 and the driving member 2 are started, so that the tap 11 moves downward and rotates at the same time to perform tapping operation on the through hole on the workpiece; while the tap 11 rotates, the positioning rod 2 rotates accordingly, and at this time, the waste chips around the through hole can be cleaned by the cleaning rod 33 to prevent the waste chips from accumulating at the hole mouth and affecting the smooth progress of the cutting process and the smooth passage of the coolant.

[0056] After completing the tapping operation, the tap 11 is withdrawn from the through hole, and then the two positioning rods 2 repeat the above positioning steps, so that the two positioning rods 2 are inserted into the through hole again, and both positioning rods 2 are in contact with the side wall of the through hole. At this time, as the positioning rods 2 rotate, the threads on the inner wall of the through hole can be cleaned by the scraper 31 and the brush 32 to remove burrs on the thread surface and ensure the quality of the thread; then the positioning rod 2 is withdrawn from the through hole and reset to prepare for the next positioning.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A workpiece threaded through-hole tapping device, comprising a frame (1), a fixing assembly and a tap (11), wherein the frame (1) is provided with a fixing station, and the fixing assembly is used to fix the workpiece on the fixing station, characterized in that: It also includes a positioning mechanism and a cleaning mechanism; The positioning mechanism comprises two positioning rods (2) and a driving structure, wherein the two positioning rods (2) are symmetrically arranged on both sides of the tap (11) and can rotate synchronously with the tap (11), and the driving structure is used to drive the two positioning rods (2) to move closer to or farther away from each other, and when the distance between the two positioning rods (2) is small, the two positioning rods (2) can move downward synchronously and be inserted into a through hole on a workpiece, and when the two positioning rods (2) move away from each other and are in contact with the inner wall of the through hole, the axis of the tap (11) is collinear with the axis of the through hole; The cleaning mechanism is provided in two groups and is respectively mounted on the lower ends of the two positioning rods (2). Each group of the cleaning mechanism comprises a scraper (31), a brush (32) and a cleaning rod (33). The scraper (31) and the brush (32) are longitudinally mounted on the lower part of the positioning rod (2). The brush (32) is formed by a flexible material. When the two positioning rods (2) are away from each other, the scraper (31) and the brush (32) can both contact the inner wall of the through hole. The cleaning rod (33) is horizontally mounted on the lower end of the positioning rod (2). When the cleaning rod (33) contacts the surface of the workpiece, the positioning rod (2) can be rotated to clean the waste chips on the side of the through hole.

2. A workpiece threaded through-hole tapping device according to claim 1, characterized in that: The frame (1) is provided with an adjustment component for adjusting the position of the tap (11), the adjustment component comprising a sliding plate (13) and a lifting plate (14), the frame (1) is provided with a horizontal slide rail (100), the sliding plate (13) is horizontally slidably matched with the frame (1) via the horizontal slide rail (100), the sliding plate (13) is provided with a vertical slide rail (131), the lifting plate (14) is longitudinally slidably matched with the sliding plate (13) via the vertical slide rail (131), the tap (11) is mounted on the lifting plate (14), and a driving member 1 for driving the tap (11) to move up and down, and a driving member 2 for driving the tap (11) to rotate are mounted on the lifting plate (14).

3. A workpiece threaded through-hole tapping device according to claim 2, characterized in that: A protective member (4) is installed at the lower end of the lifting plate (14). The lower end of the protective member (4) is open. The protective member (4) comprises a fixed portion (41) and a rotating portion (42). The fixed portion (41) is fixedly connected to the lifting plate (14) via a connecting rod (43). As the lifting plate (14) moves downward, the lower end of the fixed portion (41) can contact the surface of the workpiece. The fixed portion (41) is formed from a flexible material. A liquid infusion pipe (12) for conveying a coolant is installed on the frame (1). The water outlet end of the liquid infusion pipe (12) is arranged to penetrate the fixed portion (41). The rotating portion (42) is rotatably installed at the upper end of the fixed portion (41). The positioning rod (2) is slidably arranged to penetrate the rotating portion (42). The rotating portion (42) is provided with a through hole for the tap (11) to pass through.

4. A workpiece threaded through-hole tapping device according to claim 2, characterized in that: A driving member 4 (21) is provided on the lifting plate (14), the output end of the driving member 4 (21) extends vertically downward and is connected to a mounting plate (22), each positioning rod (2) is relatively fixed to the mounting plate (22) in the longitudinal direction, and is slidably matched with the mounting plate (22) in the horizontal direction.

5. A workpiece threaded through-hole tapping device according to claim 4, characterized in that: The mounting plate (22) comprises an outer ring (221) and an inner circular plate (222). The outer ring (221) is connected to the output end of the driving member 4 (21). The inner circular plate (222) is rotatably mounted on the middle part of the outer ring (221). A slide groove (111) is longitudinally provided on the handle of the tap (11). The inner circular plate (222) is longitudinally slidably matched with the handle of the tap (11) through the slide groove (111). Two symmetrical guide grooves (223) are provided on the inner circular plate (222). Two positioning rods (2) are respectively slidably arranged in the corresponding guide grooves (223).

6. A workpiece threaded through-hole tapping device according to claim 5, characterized in that: A distance sensor is provided on the mounting plate (22) and is capable of monitoring the horizontal movement distance of the positioning rod (2).

7. A workpiece threaded through-hole tapping device according to claim 5, characterized in that: The driving structure comprises a driving member five (23), a driving plate (24) and a guide member (25), wherein the driving member five (23) is mounted on the lifting plate (14), the driving plate (24) is connected to the output end of the driving member five (23), and a through hole for the tap (11) to pass through is provided in the middle of the driving plate (24), the guide member (25) is provided at the lower end of the driving plate (24), a bevel one is provided on the peripheral side of the guide member (25), the bevel one is inclined from top to bottom in a direction close to the tap (11), the upper end of each positioning rod (2) is provided with a bevel two matched with the bevel one, and the bevel one and the bevel two can be in sliding contact, and an elastic member (26) for driving the positioning rod (2) to reset is provided between each positioning rod (2) and the inner circular plate (222).

8. A workpiece threaded through-hole tapping device according to claim 1, characterized in that: The fixing assembly comprises a clamping plate (15) and a driving member 3, wherein two clamping plates (15) are provided and are respectively arranged on both sides of the fixing station, and the driving member 3 is arranged on the frame (1) and is used to drive the clamping plate (15) to move, and an inclined plane 3 is provided on opposite sides of the two clamping plates (15), and the inclined plane 3 is inclined from bottom to top in a direction close to the other clamping plate (15).

9. A workpiece threaded through-hole tapping device according to claim 1, characterized in that: Positioning pieces are provided at the four corners of the fixed station, each positioning piece comprises two positioning plates (16), the two positioning plates (16) in the same group are respectively located at two adjacent sides of the fixed station, and each positioning plate (16) is inclined from bottom to top in a direction away from the fixed station.

10. A workpiece threaded through-hole tapping device according to claim 3, characterized in that: The protective element (4) is formed from a transparent material.

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