A tapping device for threaded through holes of workpieces

Abstract

The present invention relates to the technical field of tapping processing, and specifically discloses a tapping device for threaded through holes of workpieces, which includes a frame, a fixing component, a tap, 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 approach or move away from each other. The cleaning mechanism is provided in two groups and is respectively installed at the lower ends of the two positioning rods. Each group of cleaning mechanisms includes a scraping plate, a brush and a cleaning rod. The scraping plate and the brush are longitudinally installed at the lower part of the positioning rod. The brush is made of a flexible material, and the cleaning rod is horizontally installed at the lower end of the positioning rod. The present invention can achieve precise positioning of the tap, ensure that the axis of the tap is collinear with the axis of the through hole, and at the same time can clean the burrs in the through hole and timely clean the generated waste chips during the tapping process, ensuring the thread quality and the service life of the tap.

Description

Technical Field

[0001] The present invention relates to the technical field of tapping processing, and specifically relates to a tapping device for threaded through holes of workpieces. Background Art

[0002] Tapping is a common machining process, mainly used to machine internal threads in holes of workpieces. This process is usually completed by using a tap through cutting or extrusion. A tap generally consists of a cutting part, a calibration part, and a shank. The cutting part is responsible for cutting the material to form threads and usually has cutting edges and chip flutes; the calibration part is used to calibrate the size and accuracy of the threads; 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 body device, on which a feeding device and a clamping device are arranged. The feeding device is used to feed the stainless steel nuts to be tapped, and the clamping device is used to clamp the stainless steel nuts to be tapped. During use, the tapping mechanism cooperates with the clamping device to achieve continuous tapping operation on the stainless steel nuts. By switching the mechanism to switch the turning direction of the tapping tool during the retraction process, the tapping tool exits along the internal thread of the stainless steel nut, preventing damage to the internal thread and removing excess burrs in the internal thread.

[0004] However, when using a tapping device to tap holes in a workpiece, there are still some problems. First, when positioning the tap and the workpiece, due to the existence of device errors, the axis of the tap may not be completely aligned with the axis of the through hole of the workpiece, affecting the thread quality. Second, there may be burrs in the holes of the workpiece. The existence of these burrs will interfere with the cutting process of the tap, resulting in an uneven thread surface, affecting the dimensional accuracy of the thread. At the same time, it will also increase the cutting load of the tap, exacerbate the wear of the tap, and may even cause the tap to jam or break. In addition, during the tapping process, the waste chips generated by the tap cutting may gush out from the upper end of the hole under the impact of the cutting force or coolant. These waste chips will accumulate at the hole opening or on the thread profile, not only interfering with the cutting process again, but also blocking the inflow of coolant, making the coolant unable to flow smoothly to the cutting area and affecting the cooling effect. Summary of the Invention

[0005] The present invention provides a tapping device for threaded through holes of workpieces, aiming to solve the problems existing in the tapping devices in the related art. There is a lack of effective positioning of the tap, making it difficult to ensure that the axis of the tap is completely aligned with the axis of the through hole of the workpiece, which affects the thread quality. 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 generated waste chips cannot be cleaned in time, so that the waste chips are easily accumulated at the hole opening or on the thread profile, interfering with the cutting process again and affecting the introduction of the coolant.

[0006] A tapping device for threaded through holes of workpieces according to the present invention includes a frame, a fixing component and a tap. A fixing station is provided on the frame, and the fixing component is used to fix the workpiece at the fixing station. It also includes a positioning mechanism and a cleaning mechanism;

[0007] 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 approach or move away from each other. When the distance between the two positioning rods is small, the two can move downward synchronously and insert 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 collinear with the axis of the through hole;

[0008] The cleaning mechanism is provided in two groups and is respectively installed at the lower ends of the two positioning rods. Each group of cleaning mechanisms includes a scraping plate, a brush and a cleaning rod. The scraping plate and the brush are longitudinally installed at the lower part of the positioning rod. The brush is made of a flexible material. When the two positioning rods move away from each other, both the scraping plate and the brush can be in contact with 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 is in contact with the surface of the workpiece, it can clean the waste chips around the through hole by the rotation of the positioning rod.

[0009] Place the workpiece to be processed on the fixed station and fix it through the fixing component. Since the distance between the two positioning rods is small in the initial state, when the two positioning rods move downward synchronously, their lower ends can be inserted into the through holes on the workpiece. Then, drive the two positioning rods to move away from each other through 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, realizing the precise positioning of the tap and ensuring the subsequent thread quality. 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, by rotating the tap, the two positioning rods can be driven to rotate synchronously, so as to clean the side walls of the through hole through the scraping plate and the brush, remove the burrs in the through hole, ensure the smooth progress of the subsequent cutting process, and guarantee the thread quality and the service life of the tap. After cleaning the inner wall of the through hole, the two positioning rods withdraw from the through hole synchronously, and then the two positioning rods move away from each other to provide enough space for the subsequent downward movement of the tap. 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 during the subsequent tapping process, the cleaning rod can be driven to rotate around the circumference of the through hole by the rotation of the positioning rod, and the generated waste chips can be cleaned in time, avoiding the accumulation of waste chips on the circumference of the through hole and interfering with the cutting process again, and ensuring the smooth progress of the tapping process and the smooth introduction of the coolant.

[0010] Preferably, an adjusting component for adjusting the position of the tap is provided on the frame. The adjusting component includes a sliding plate and a lifting plate. A horizontal slide rail is provided on the frame. The sliding plate is horizontally slidably matched with the frame through the horizontal slide rail. A vertical slide rail is provided on the sliding plate. The lifting plate is longitudinally slidably matched with the sliding plate through the vertical slide rail. The tap is installed on the lifting plate, and a first driving part for driving the tap to move up and down and a second driving part for driving the tap to rotate are installed on the lifting plate.

[0011] Preferably, a protective part is installed at the lower end of the lifting plate. 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 through 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 made of a flexible material. An infusion pipe for conveying coolant is installed on the frame. The water outlet end of the infusion pipe penetrates through the fixed part. The rotating part is rotatably installed at the upper end of the fixed part. The positioning rod slidably penetrates through the rotating part, and a through hole for the tap to pass through is provided on the rotating part.

[0012] 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 during the tapping process, the generated waste chips and the introduced coolant can be effectively restricted in the protective space, preventing the waste chips and the coolant from splashing to other areas on the surface of the workpiece and avoiding affecting the processing of other through holes subsequently.

[0013] Preferably, a fourth driving member is provided on the lifting plate. The output end of the fourth driving member extends vertically downward and is connected to a mounting plate. Each positioning rod is fixedly relative to the mounting plate in the longitudinal direction and is slidably engaged with the mounting plate in the horizontal direction.

[0014] Preferably, the mounting plate includes an outer ring and an inner circular plate. The outer ring is connected to the output end of the fourth driving member. The inner circular plate is rotatably mounted in the middle of the outer ring. A chute is provided longitudinally on the shank of the tap. The inner circular plate is longitudinally slidably engaged with the shank of the tap through the chute. Two symmetric guiding grooves are provided on the inner circular plate. The two positioning rods are respectively slidably disposed in the corresponding guiding grooves.

[0015] The effect is that the synchronous rotation of the tap and the positioning rod can be realized through the sliding fit between the inner circular plate and the tap and the sliding fit between the positioning rod and the inner circular plate, and the longitudinal movement freedom between the tap and the positioning rod is reserved to ensure the smooth progress of the tapping process and the positioning process.

[0016] Preferably, a distance sensor is provided on the mounting plate, which can monitor the distance of the horizontal movement of the positioning rod.

[0017] The effect is that during the process of the two positioning rods moving away from each other, the precise adjustment of the tap by the adjustment assembly can be realized according to the distance data monitored by the distance sensor, ensuring the precise positioning of the tap.

[0018] Preferably, the driving structure includes a fifth driving member, a driving plate and a guiding member. The fifth driving member is mounted on the lifting plate. The driving plate is connected to the output end of the fifth driving member. A through hole for the tap to pass through is provided in the middle of the driving plate. The guiding member is disposed at the lower end of the driving plate. A first inclined surface is provided on the circumferential side of the guiding member. The first inclined surface inclines downward from top to bottom towards the direction close to the tap. A second inclined surface adapted to the first inclined surface is provided at the upper end of each positioning rod. The first inclined surface and the second inclined surface can be in sliding contact. An elastic member for driving the positioning rod to reset is provided between each positioning rod and the inner circular plate.

[0019] Preferably, the fixing assembly includes clamping plates and a third driving member. The clamping plates are provided in two and are respectively disposed on both sides of the fixing station. The third driving member is disposed on the machine frame and is used for driving the clamping plates to move. A third inclined surface is provided on the opposite side of the two clamping plates. The third inclined surface inclines upward from bottom to top towards the direction close to the other clamping plate.

[0020] Preferably, positioning members are provided at the four corners of the fixing station. Each positioning member includes two positioning plates. The two positioning plates in the same group are respectively located at two adjacent side edges of the fixing station. Each positioning plate inclines upward from bottom to top towards the direction away from the fixing station.

[0021] The effect is that when the workpiece to be processed is placed at the fixed station, the positioning member can guide the workpiece, so that the workpiece automatically moves towards the center of the fixed station to cooperate with the fixing component to clamp the workpiece and ensure the stability of the workpiece.

[0022] Preferably, the protective member is formed of a transparent material.

[0023] The beneficial effects of the present invention are as follows:

[0024] 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, by moving the two positioning rods downward synchronously, the lower ends of the positioning rods can be inserted into the through holes on the workpiece. Then, the driving structure drives the two positioning rods to move away from each other until both 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, realizing the precise positioning of the tap and ensuring the subsequent thread quality.

[0025] 2. The present invention is provided with a cleaning mechanism. When the lower ends of the positioning rods are inserted into the through holes, the cleaning mechanism will move into the through holes synchronously. When the two positioning rods move away from each other, the scraper and the brush will both be in contact with the side walls of the through holes. At this time, by rotating the two positioning rods, the scraper and the brush can be driven to rotate synchronously to scrape the burrs in the through holes, ensuring the smooth progress of the subsequent cutting process, and thus guaranteeing the thread quality and the service life of the tap; in addition, during the tapping process, when the cleaning rod contacts the surface of the workpiece, the cleaning rod can be driven to rotate synchronously by the rotation of the positioning rod to timely clean the waste chips around the through holes, preventing the waste chips from accumulating at the through holes and interfering with the cutting process again, so as to ensure the smooth progress of the tapping process and the smooth passage of the coolant.

[0026] 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 around the through hole, so that during the tapping process, the generated waste chips and the introduced coolant can be restricted within the protective space and will not splash to other areas on the surface of the workpiece, avoiding affecting the processing of other through holes subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structural schematic diagram of the present invention.

[0028] Figure 2 is the side view of the present invention.

[0029] Figure 3 is the assembled structural schematic diagram of the positioning mechanism and the cleaning mechanism of the present invention.

[0030] Figure 4 is the schematic diagram when the positioning mechanism of the present invention performs positioning.

[0031] Figure 5 It is a schematic structural diagram of the positioning mechanism of the present invention.

[0032] Figure 6 It is a schematic assembly structure diagram of the positioning rod and the driving structure of the present invention.

[0033] Figure 7 It is a schematic assembly structure diagram of the positioning rod and the mounting plate of the present invention.

[0034] Figure 8 It is a schematic diagram when the cleaning rod of the present invention cleans the periphery of the through hole.

[0035] Figure 9 It is a schematic assembly structure diagram of the positioning rod and the protective member of the present invention.

[0036] Figure 10 It is a schematic structural diagram of the protective member of the present invention.

[0037] Reference numerals:

[0038] 1, frame; 100, horizontal slide rail; 11, tap; 111, chute; 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, guiding groove; 23, driving member five; 24, driving plate; 25, guiding member; 26, elastic member; 31, scraping plate; 32, brush; 33, cleaning rod; 4, protective member; 41, fixing portion; 42, rotating portion; 43, connecting rod. Detailed Description of the Invention

[0039] The embodiments of the present invention will be described in detail below, and the examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] As Figures 1 to 10 shown, a tapping device for a threaded through hole of a workpiece of the present invention includes a frame 1, a fixing assembly, a tap 11, an infusion tube 12, a positioning mechanism, and a cleaning mechanism.

[0041] A fixed station is provided on the frame 1, and a fixing component is used to fix the workpiece to be processed on the fixed station. The tap 11 is installed on the frame 1 and can machine the required internal thread in the through-hole of the workpiece by means of rotary cutting. The infusion pipe 12 is installed on the frame 1 and can convey 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 collinear with the axis of the through-hole to be processed, thereby realizing the accurate positioning of the tap 11 and laying a 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 interference with the cutting process of the tap 11 due to burrs in the through-hole. In addition, the cleaning mechanism can also clean the periphery of the through-hole during the machining process, avoiding the influence of waste chips accumulated at the hole opening on the passage of the coolant or the cutting process, thereby ensuring the machining accuracy.

[0042] As Figures 1 to 3 shown, in order to realize the adjustment of the position of the tap 11, an adjustment component is provided on the frame 1. 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 is horizontally slidably matched with the frame 1 through the horizontal slide rail 100 to realize the position adjustment 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 is longitudinally slidably matched with the sliding plate 13 through the vertical slide rail 131 to realize the position adjustment of the tap 11 in the vertical direction. The tap 11 is installed on the lifting plate 14, and a first driving member for driving the tap 11 to move up and down and a second driving member for driving the tap 11 to rotate are installed on the lifting plate 14.

[0043] In this embodiment, the first driving member is set as the first cylinder 17, and the shank of the tap 11 is connected to the output end of the first cylinder 17 to realize the longitudinal movement of the tap 11. The second driving member is set as the motor 18. A first gear and a second gear are rotatably installed on the lifting plate 14, and the first gear and the second gear are meshed and driven. The first gear is connected to the output end of the motor 18, and the second gear is longitudinally slidably sleeved outside the shank of the tap 11 to realize the rotational movement of the tap 11. Through the coordinated work of the first driving member and the second driving member, the cutting process of the tap 11 can be realized.

[0044] As Figures 1 to 4As shown in the figure, the fixing component includes clamping plates 15 and the third driving member. There are two clamping plates 15, which are respectively arranged on both sides of the fixing station for clamping the workpiece. The third driving member is arranged on the frame 1. The third driving member can be set as two second cylinders 19, which are used to independently drive the corresponding clamping plates 15 to move, so as to clamp or loosen the workpiece. On the opposite sides of the two clamping plates 15, there are both inclined surfaces three, and the inclined surfaces three are inclined upward in the direction approaching the other clamping plate 15. In this way, not only can the workpiece be clamped in the horizontal direction, but also a downward force can be applied to the workpiece in the vertical direction, firmly pressing the workpiece on the fixing station to prevent the workpiece from sliding up and down or tilting during the tapping process.

[0045] As Figures 3 to 8 shown in the figure, 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 approach or move away from each other. When the distance between the two positioning rods 2 is small, at this time, the two positioning rods 2 can be synchronously moved downward, 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 are in contact with 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, realizing the positioning of the tap 11.

[0046] As Figures 3 to 5 shown in the figure, in order to realize the synchronous up and down movement of the two positioning rods 2, a fourth driving member 21 is arranged on the lifting plate 14. The fourth driving member 21 can be a cylinder, an electric push rod, etc. The output end of the fourth driving member 21 extends vertically downward and is connected with a mounting plate 22, which can realize the up and down movement of the mounting plate 22. Each positioning rod 2 is relatively fixed to the mounting plate 22 longitudinally, ensuring 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 make horizontal adjustments while maintaining synchronous up and down movement.

[0047] Among them, a distance sensor is arranged 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 the monitored data back to the control system. The control system adjusts the position of the tap 11 accordingly through the adjusting component according to the received distance data to ensure that when both positioning rods 2 are in contact with the inner wall of the through hole, the monitored data is consistent, ensuring that the tap 11 corresponds to the center position of the through hole. In addition, the distance sensor can be used in cooperation with the driving structure to realize precise control of the positioning rod 2. When the distance sensor monitors that the positioning rod 2 reaches the predetermined position, the driving structure can be triggered to stop moving, thus ensuring the smooth progress of the positioning process and the cleaning process.

[0048] As Figures 3 to 7As shown in the figure, the driving structure includes a fifth driving member 23, a driving plate 24 and a guiding member 25. The fifth driving member 23 is installed on the lifting plate 14, and the fifth driving member 23 can be a cylinder, an electric push rod, etc. The driving plate 24 is connected to the output end of the fifth driving member 23. A through hole for the tap 11 to pass through is provided in the middle of the driving plate 24, allowing the tap 11 to pass through for tapping operation. The guiding member 25 is provided at the lower end of the driving plate 24. An inclined surface one is provided on the peripheral side of the guiding member 25. The inclined surface one is inclined downward from top to bottom in the direction close to the tap 11. An inclined surface two adapted to the inclined surface one is provided at the upper end of each positioning rod 2, and the inclined surface one and the inclined surface two can be in sliding contact to push the two positioning rods 2 away from each other to realize the contact positioning of 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 keep the distance between the two positioning rods 2 small when the positioning rod 2 is not stressed, so as to insert it into the through hole.

[0049] Specifically, when tapping the workpiece is required, the driving plate 24 is controlled by the fifth driving member 23 to move upward. 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 rods 2 into the through hole of the workpiece. Then, the driving plate 24 is controlled by the fifth driving member 23 to move downward, so that the inclined surface one on the guiding member 25 contacts the inclined surface two 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 is collinear with the axis of the through hole, realizing precise positioning. After tapping is completed, the driving plate 24 is controlled by the fifth driving member 23 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 taking out the positioning rods 2 from the through hole.

[0050] As Figures 4 to 8 shown in the figure, two sets of cleaning mechanisms are provided and are respectively installed at the lower ends of the two positioning rods 2. Each set of cleaning mechanisms includes a scraping plate 31, a brush 32 and a cleaning rod 33. The scraping plate 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, both the scraping plate 31 and the brush 32 can contact the inner wall of the through hole. Among them, the scraping plate 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 formed by a flexible material and can adapt to the slight unevenness of the inner wall of the through hole to ensure the comprehensiveness of 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, it can clean the waste chips on the periphery of the through hole by the rotation of the positioning rod 2.

[0051] As Figures 3 to 7As shown, in order to achieve 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 four 21. The inner circular plate 222 is rotatably mounted in the middle of the outer ring 221, so that the inner circular plate 222 can freely rotate within the outer ring 221, providing a basis for the synchronous rotation of the tap 11 and the positioning rod 2. A chute 111 is longitudinally provided on the shank of the tap 11. The inner circular plate 222 is longitudinally slidably engaged with the shank of the tap 11 through the chute 111. Two symmetric guiding grooves 223 are provided on the inner circular plate 222, and the two positioning rods 2 are respectively slidably disposed in the corresponding guiding grooves 223. Through the sliding fit between the inner circular plate 222 and the tap 11, and the sliding fit between the positioning rod 2 and the inner circular plate 222, the synchronous rotation of the positioning rod 2 and the tap 11 is achieved, while retaining the longitudinal movement freedom of each component, simplifying the device structure.

[0052] As Figure 1 , Figure 3 , Figure 9 and Figure 10 As shown, a protective member 4 is installed at the lower end of the lifting plate 14. The lower end of the protective member 4 is in an open shape. The protective member 4 includes a fixed part 41 and a rotating part 42. The fixed part 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 part 41 can be brought into contact with the surface of the workpiece, so as to form a closed protective space around the through hole to be machined. The fixed part 41 is formed by a flexible material, such as silica gel, soft plastic or flexible rubber and other materials. These materials have good elasticity and sealing performance, and can form an effective seal when contacting the surface of the workpiece. The water outlet end of the infusion pipe 12 penetrates through the fixed part 41, ensuring that the coolant can be smoothly delivered to the cutting area and guaranteeing the cooling effect. The rotating part 42 is rotatably mounted at the upper end of the fixed part 41. The positioning rod 2 slidably penetrates through the rotating part 42, and a through hole for the tap 11 to pass through is provided on the rotating part 42, ensuring the normal progress of the positioning operation and the tapping operation. By providing the protective member 4, during the tapping process, the generated waste chips and the introduced coolant are restricted within the protective space and will not splash to other areas on the surface of the workpiece, avoiding affecting the machining of subsequent other through holes, and at the same time, it can effectively protect the operator from the harm of flying waste chips and coolant.

[0053] Among them, the protective member 4 is formed by a transparent material, which is convenient for the operator to observe the tapping process in real time, timely discover and handle 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 condition of the coolant, ensuring the cooling effect and thus ensuring the smooth progress of the tapping operation.

[0054] As Figures 1 to 4As shown in the figure, positioning members are provided at the four corners of the fixed station. Each positioning member includes 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 inclines away from the fixed station from bottom to top. When the workpiece is placed on the fixed station, the four groups of positioning members will guide the workpiece simultaneously, causing the workpiece to automatically slide towards the center position of the fixed station, ensuring the accurate positioning of the workpiece on the fixed station. Among them, the positioning plates 16 are slidably installed on the frame 1 to adapt to workpieces of different sizes.

[0055] The working process of the tapping device of the present invention is as follows: First, place the workpiece to be processed on the fixed station, and then firmly fix the workpiece on the fixed station through the fixing component. At this time, the two positioning rods 2 of the positioning mechanism maintain a relatively small distance in the initial state. When starting the driving member four 21 and driving the mounting plate 22 to move downward, it can drive the two positioning rods 2 to move downward synchronously, so that the lower ends of the positioning rods 2 are inserted into the through holes on the workpiece.

[0056] After the positioning rods 2 are inserted into the through holes, start the driving member five 23 to drive the driving plate 24 and the guiding member 25 to move downward, so that the first inclined surface on the guiding member 25 contacts the second inclined surface at the upper end of the positioning rod 2. At this time, by continuously moving the driving plate 24 downward, it can push the two positioning rods 2 away from each other. During this process, according to the distance data of the movement of the positioning rods 2 monitored by the distance sensor, adjust the position of the lifting plate 14 through the adjusting component until both positioning rods 2 contact the side walls of the through holes. 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, realizing the precise positioning of the tap 11.

[0057] Then start the motor 18 to drive the first gear to rotate, and under the meshing transmission of the first gear and the second gear, drive the second gear and the tap 11 to rotate. Since the shank of the tap 11 is longitudinally slidably matched with the inner circular plate 222, it will drive the inner circular plate 222 to rotate accordingly, and at the same time drive the two positioning rods 2 to rotate. At this time, the scraping plates 31 and the brushes 32 installed at the lower ends of the positioning rods 2 can contact the side walls of the through holes to scrape and clean the burrs in the through holes, providing a good through hole environment for the subsequent tapping process.

[0058] After completing the cleaning of the inside of the through hole, start the driving member four 21 to drive the mounting plate 22 to move upward and drive the two positioning rods 2 to move upward synchronously, so that the lower ends of the positioning rods 2 withdraw from the through holes. Then start the driving member five 23 to drive the driving plate 24 and the guiding member 25 to continue moving 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 start the driving member four 21 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.

[0059] Then, drive member 1 and drive member 2 are started, so that while the tap 11 moves downward, it rotates, and a tapping operation is performed on the through hole in the workpiece; while the tap 11 rotates, the positioning rod 2 rotates accordingly. At this time, the waste chips on the periphery of the through hole can be cleaned by the cleaning rod 33, so as to prevent the waste chips from accumulating at the hole opening and affecting the smooth progress of the cutting process and the smooth passage of the coolant.

[0060] After the tapping operation is completed, the tap 11 withdraws from the through hole. 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 of the two positioning rods 2 are in contact with the side wall of the through hole. At this time, as the positioning rod 2 rotates, the inner wall threads of the through hole can be cleaned by the scraping plate 31 and the brush 32 to remove the burrs on the thread surface and ensure the thread quality; then the positioning rod 2 withdraws from the through hole and resets to prepare for the next positioning.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to 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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