A tapping machine for processing a student bed connecting piece

Abstract

The application discloses a tapping machine for student bed connecting piece machining and relates to the technical field of thread cutting machine tools, which comprises a base and a tapping machine, the tapping machine is installed on the base, the output shaft end of the tapping machine is fixedly connected with a rotating sleeve, the lower end of the rotating sleeve is clamped with a chuck, the chuck holds a tapping head, a detection assembly for detecting the deflection of the tapping head is arranged in the rotating sleeve, when the tapping head is bent, deflected or has abnormal coaxiality during axial detection movement, the deflection part can push the test sleeve to make the rod sliding plate displace, so that the small deflection of the tapping head which is difficult to directly observe is converted into mechanical displacement which can be detected, the pre-detection of the use state of the tapping head is realized, the problems of the threaded hole inclination, uneven thread processing and abnormal wear of the tapping head caused by the deflected tapping head directly participating in thread cutting are reduced, and the stability of the tapping of the connecting piece is improved.

Description

Technical Field

[0001] This invention relates to the field of thread cutting machine tool technology, specifically a tapping machine for machining student bed connecting parts. Background Technology

[0002] Industrial machinery manufacturing is a core industrial sector for the large-scale production of hardware components, home furnishing parts, and precision connectors. It encompasses various metal cutting, forming, and assembly processes. Within this sector, student bed connectors are crucial hardware components ensuring the stability and structural strength of student bed assembly. Welded nut connectors require precise tapping to create standard threaded holes, meeting the assembly accuracy and load-bearing requirements of the bed frame. Therefore, tapping is a critical process in the production of student bed connectors. Currently, the industry commonly uses specialized tapping machines to perform thread cutting on connectors, adapting to the needs of mass production in industrial machinery manufacturing. However, existing tapping equipment still suffers from numerous technical defects that affect the machining accuracy and finished product yield of connectors during actual processing.

[0003] In existing technologies, tapping heads on tapping machines operate at high speeds and undergo frequent feed cutting over extended periods, making them prone to minor deviations, skewing, and coaxiality issues. These minute deformations and positional deviations are extremely small and cannot be detected by the naked eye, making timely inspection and correction before processing difficult. Workers can only rely on experience to install, debug, and routinely inspect the tapping heads, unable to accurately determine their perpendicularity and alignment. Continuous operation of a tapping head with slight skewing defects can cause deviations in the cutting trajectory, resulting in quality problems such as misaligned threaded holes, uneven thread thickness, and diameter deviations in connectors. This not only significantly reduces the thread machining accuracy of connectors but also easily leads to tapping head wear and breakage, increasing equipment maintenance costs and workpiece scrap rates.

[0004] Meanwhile, in the mechanical manufacturing process of student bed connectors, the thread forming of welded nut-type components requires pre-drilling. The perpendicularity and regularity of the pre-drilled holes are fundamental prerequisites for subsequent tapping. Currently, the pre-drilling process is mostly completed using conventional drilling equipment. Due to factors such as tooling positioning errors, workpiece placement offsets, and drilling equipment accuracy deviations, pre-drilled holes are prone to skewness and tilting. Existing tapping machines lack pre-drilled hole position detection and adaptation correction functions, making it impossible to identify skew defects in pre-drilled holes. If thread cutting is performed directly on skewed pre-drilled holes, it will lead to tilted threaded holes and deformed threads, ultimately causing the connectors to fail to assemble properly, resulting in safety hazards such as loose bed frame connections and uneven stress, making it difficult to meet the high-precision and high-stability processing requirements of student bed connectors.

[0005] Therefore, in view of this, the present invention provides a tapping machine for processing student bed connectors. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a tapping machine for processing student bed connectors, thereby solving the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a tapping machine for processing student bed connectors, comprising a base and a tapping machine, the tapping machine being mounted on the base, a rotating sleeve being fixedly connected to the output shaft end of the tapping machine, a chuck being clamped at the lower end of the rotating sleeve, a tapping head being held in the chuck, a detection component for detecting tapping head deviation being provided inside the rotating sleeve, the detection component comprising an electric telescopic rod fixedly connected to the top of the inner cavity of the rotating sleeve, an installation sleeve being fixedly connected to the lower end of the electric telescopic rod for gripping the tapping head and driving the tapping head to move axially upward, a test sleeve for detection being fitted on the outer surface of the tapping head, the inner diameter of the test sleeve being adapted to the outer diameter of the threaded section of the tapping head;

[0008] An automatic feeding and clamping fixture is installed on the upper surface of the base. The automatic feeding and clamping fixture is equipped with a detection and rejection component for detecting the misalignment of the pre-drilled hole of the connector and rejecting unqualified connectors. The rejection component includes a test head that moves down and inserts into the pre-drilled hole of the connector. A discharge plate for rejecting unqualified connectors by translation is slidably connected to the automatic feeding and clamping fixture. Two auxiliary springs to help the discharge plate reset are fixedly connected between the discharge plate and the side wall of the automatic feeding and clamping fixture.

[0009] Preferably, the detection assembly further includes threaded rods threaded to both sides of the mounting sleeve. One end of the threaded rod, which penetrates into the inner side of the mounting sleeve, is rotatably connected to a clamping pad. Two vertical grooves corresponding to the positions of the threaded rods are formed on the outer surface of the rotating sleeve. One end of the threaded rod extends out of the vertical groove. An arc-shaped sleeve is fixedly connected to the bottom of the chuck. A sliding plate with a rod is slidably connected inside the arc-shaped sleeve. The sliding plate with a rod consists of an arc-shaped plate and two sliding rods. Multiple support springs are fixedly connected between the arc-shaped plate of the sliding plate and the arc-shaped sleeve.

[0010] Preferably, the rods of the sliding plate extend through the lower surface of the arc-shaped sleeve, and one end of the rods of the sliding plate extending through the arc-shaped sleeve is fixedly connected to the test sleeve by bolts. A contact sensor is fixedly connected to the bottom of the inner cavity of the arc-shaped sleeve.

[0011] Preferably, the rotating sleeve has two L-shaped slots on its outer surface near the chuck, and the upper surface of the chuck is fixedly connected to two clamping heads that are adapted to the L-shaped slots.

[0012] Preferably, the automatic feeding clamping fixture is equipped with two pneumatic clamping plates, and a pneumatic feeding plate is provided on the side of the base. A feeding frame is also provided on one side of the automatic feeding clamping fixture. A receiving groove is provided at the end of the pneumatic feeding plate near the feeding frame, and a round hole is provided at the bottom of the receiving groove to facilitate the removal of unqualified connecting nuts.

[0013] Preferably, the rejection assembly also includes an L-shaped plate fixedly connected to one side of the automatic feeding clamping fixture table. A small electric cylinder is fixedly connected to the L-shaped plate. A hollow cylinder is fixedly connected to the movable end of the small electric cylinder. A piston sleeve is slidably connected inside the hollow cylinder. The test head is threadedly connected to the lower end of the piston sleeve. The piston sleeve consists of a piston plate and a threaded sleeve.

[0014] Preferably, a second contact sensor is fixedly connected to the top of the inner cavity of the hollow cylinder, an air pipe is fixedly connected to the outer surface of the hollow cylinder near the upper part, a piston cylinder is fixedly connected to the lower surface of the automatic feeding clamping fixture near the discharge plate, and one end of the air pipe that passes through the L-shaped plate is fixedly connected to the piston cylinder.

[0015] Preferably, a piston plate with a rod is slidably connected to the inner surface of the piston cylinder. The piston plate with a rod consists of a rod and a piston plate. One end of the rod of the piston plate that extends out of the piston cylinder is fixedly connected to the side wall of the discharge plate.

[0016] The tapping machine for processing student bed connectors provided by this invention has the following beneficial effects:

[0017] This invention, by setting a test sleeve on the outside of the tapping head, and cooperating with a sliding plate with a rod, a support spring, and a contact sensor, allows the tapping head to bend, deviate, or have abnormal coaxiality during axial movement. When the tapping head is bent, deviated, or has abnormal coaxiality, the deviated part can push against the test sleeve, causing the test sleeve to move the sliding plate with the rod. This converts the minute deviance of the tapping head, which is difficult to observe directly, into a detectable mechanical displacement, enabling pre-detection of the tapping head's usage status. This reduces the problems of tilted thread holes, uneven thread processing, and abnormal wear caused by the deviated tapping head directly participating in thread cutting, and is beneficial to improving the stability of tapping processing of connecting parts.

[0018] This invention, by setting up a test head, a hollow cylinder, and a piston sleeve, allows for the pre-insertion of the test head into the pre-drilled hole of the student bed connector before it enters the tapping station for inspection. When the position and axis of the pre-drilled hole are within the allowable range, the test head can smoothly enter the pre-drilled hole. However, when the pre-drilled hole is significantly tilted, the test head is blocked by the hole wall, causing relative displacement between the piston sleeve and the hollow cylinder. This allows for the identification of connectors with tilted hole defects before formal tapping, avoiding forced tapping of the tilted hole connector and reducing the probability of tilted threads and connector scrap from the source.

[0019] This invention utilizes the pneumatic linkage between the hollow cylinder, piston sleeve, air pipe, piston cylinder, and piston plate with rod. After the test head is blocked by the inclined hole, the pressure generated by the gas pressure inside the hollow cylinder drives the piston plate with rod to move, which in turn drives the discharge plate to open the discharge port at the bottom of the pneumatic feeding plate receiving groove. This allows the defective connectors to be automatically discharged before the actual tapping, achieving mechanical linkage between pre-drilling inspection and defective part rejection, reducing manual inspection and sorting operations.

[0020] This invention provides an L-shaped groove on the rotating sleeve and a clamping head that matches the L-shaped groove on the chuck. When installing the chuck, simply move the clamping head along the vertical part of the L-shaped groove and then rotate it into the horizontal arc part to complete the limiting connection between the chuck and the rotating sleeve. Disassembly is performed by reversing the operation. Compared with the installation method of repeatedly disassembling and assembling multiple fastening bolts, this invention facilitates the inspection and replacement of the chuck and tapping head.

[0021] The test head and piston sleeve of this invention are detachably connected. When the test head is repeatedly inserted into the pre-drilled hole of the metal connector for a long time and wears, bends or suffers surface damage, the test head can be removed and replaced separately without replacing the hollow cylinder, piston sleeve and its drive assembly as a whole. This reduces the maintenance cost of the testing mechanism and makes it easy to replace the test head with a suitable one according to the pre-drilled hole size of different connectors. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation of the three-dimensional structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Enlarged structural diagram of region A in the middle;

[0024] Figure 3 This is a schematic diagram of the installation of the three-dimensional structure from another perspective of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged structural diagram of region B in the middle;

[0026] Figure 5 This is a schematic diagram of a partial cross-section of the rotating sleeve of the present invention;

[0027] Figure 6 For the present invention Figure 5 A magnified structural diagram of region C in the middle.

[0028] Figure 7 This is a schematic diagram showing the installation of the discharge plate, automatic feeding clamping fixture, and auxiliary springs of the present invention.

[0029] Figure 8This is a schematic diagram of the installation of the small electric cylinder, hollow cylinder and piston sleeve of the present invention;

[0030] In the picture:

[0031] 1. Base; 2. Tapping machine; 3. Rotating sleeve; 4. Chuck; 41. L-shaped slot; 42. Snap connector; 5. Tapping head; 51. Electric telescopic rod; 52. Mounting sleeve; 53. Threaded rod; 54. Vertical groove; 55. Clamping pad; 56. Arc sleeve; 57. Support spring; 58. Sliding plate with rod; 59. Test sleeve; 510. Contact sensor one; 6. Automatic feeding clamping fixture; 61. Pneumatic clamping plate; 62. Pneumatic feeding plate; 63. L-shaped plate; 64. Small electric cylinder; 65. Hollow cylinder; 66. Piston sleeve; 67. Test head; 68. Discharge plate; 69. Auxiliary spring; 610. Contact sensor two; 611. Air pipe; 612. Piston cylinder; 613. Piston plate with rod; 7. Feeding frame. Detailed Implementation

[0032] Embodiments of the present invention:

[0033] Example 1

[0034] Please see Figure 1 , Figure 2 and Figure 5 , Figure 6 A tapping machine for processing student bed connectors includes a base 1 and a tapping machine 2. The tapping machine 2 is mounted on the base 1. A rotating sleeve 3 is fixedly connected to the output shaft end of the tapping machine 2. A chuck 4 is clamped at the lower end of the rotating sleeve 3. A tapping head 5 is held in the chuck 4. A lifting detection component for detecting the deviation of the tapping head 5 is provided inside the rotating sleeve 3. The detection component includes an electric telescopic rod 51 fixedly connected to the top of the inner cavity of the rotating sleeve 3. An installation sleeve 52 for holding the tapping head 5 and driving the tapping head 5 to move axially upward is fixedly connected to the lower end of the electric telescopic rod 51. A test sleeve 59 for detection is also fitted on the outer surface of the tapping head 5. The inner diameter of the test sleeve 59 is adapted to the outer diameter of the threaded section of the tapping head 5.

[0035] An automatic feeding and clamping fixture 6 is installed on the upper surface of the base 1. The automatic feeding and clamping fixture 6 is equipped with a detection and rejection component for detecting the misalignment of the pre-drilled hole of the connector and rejecting unqualified connectors. The rejection component includes a test head 67 that moves down and inserts into the pre-drilled hole of the connector. A discharge plate 68 for rejecting unqualified connectors by translation is slidably connected to the automatic feeding and clamping fixture 6. Two auxiliary springs 69 are fixedly connected between the discharge plate 68 and the side wall of the automatic feeding and clamping fixture 6 to help the discharge plate 68 reset.

[0036] The detection assembly also includes threaded rods 53 threaded to both sides of the mounting sleeve 52. One end of each threaded rod 53, which penetrates into the inner side of the mounting sleeve 52, is rotatably connected to a clamping pad 55. Two vertical grooves 54, corresponding to the positions of the threaded rods 53, are opened on the outer surface of the rotating sleeve 3. One end of each threaded rod 53 extends out of the vertical groove 54. An arc-shaped sleeve 56 is fixedly connected to the bottom of the chuck 4. A sliding plate 58 with a rod is slidably connected inside the arc-shaped sleeve 56. The sliding plate 58 consists of an arc-shaped plate and two sliding rods. Multiple support springs 57 are fixedly connected between the arc-shaped plate of the sliding plate 58 and the arc-shaped sleeve 56. The rods of the sliding plate 58 extend out of the lower surface of the arc-shaped sleeve 56. One end of each rod of the sliding plate 58 extending out of the arc-shaped sleeve 56 is fixedly connected to the test sleeve 59 by bolts. A contact sensor 510 is fixedly connected to the bottom of the inner cavity of the arc-shaped sleeve 56.

[0037] Two L-shaped slots 41 are provided on the outer surface of the rotating sleeve 3 near the chuck 4. The L-shaped slot 41 is composed of a vertical through slot and a horizontal arc slot. Two clamping heads 42 that are adapted to the L-shaped slots 41 are fixedly connected to the upper surface of the chuck 4.

[0038] When using the above solution, the existing tapping chuck 4 has the functions of clamping the tap and transmitting torque. It is usually installed at the lower end of the spindle. In this solution, when the chuck 4 is installed on the rotating sleeve 3 at the lower end of the spindle, the two retaining heads 42 on the upper surface of the chuck 4 are first aligned with the vertical through groove of the L-shaped retaining groove 41. Then, the chuck 4 is pulled upward to make the retaining heads 42 move upward in the vertical through groove of the L-shaped retaining groove 41 and enter the horizontal arc groove. The chuck 4 can then be rotated to move the retaining heads 42 to the end of the horizontal arc groove of the L-shaped retaining groove 41, which can effectively fix the position of the chuck 4. Then, the tapping head 5 is installed in the chuck 4. The chuck 4 is an existing structure that can clamp and fix the tapping head 5. At this point, the installation of the tapping head 5 is completed.

[0039] Traditional tapping chucks 4 often use threaded locking or bolt tightening methods. This solution uses a snap-fit ​​connector 42 to align with the vertical groove and pull upwards. With a single turn, it can be snapped into the end of the horizontal arc groove to complete the fixation. Reverse rotation and lowering allow for quick disassembly. The entire process can be done by hand without wrenches or tightening screws, which improves the convenience of replacing the chuck 4.

[0040] After the tapping head 5 is initially installed, to prevent the tapping thread from tilting due to long-term use, clamping deviation, or slight bending, a skew test can be performed on the tapping head 5 before the tapping operation begins or periodically according to the preset maintenance cycle. During the test, the spindle of the tapping machine 2 remains stopped, and the tapping head 5 is pre-inserted into the chuck 4, but the chuck 4 is not yet fully locked, allowing the tapping head 5 to move axially a certain distance relative to the chuck 4.

[0041] Then, the electric telescopic rod 51 is activated, causing the movable end of the electric telescopic rod 51 to move the mounting sleeve 52 to the smooth rod part on the upper part of the tapping head 5. Then, the threaded rods 53 on both sides of the mounting sleeve 52 are rotated respectively, so that the two threaded rods 53 gradually move towards the inside of the mounting sleeve 52. The two threaded rods 53 respectively drive the corresponding clamping pads 55 to approach the tapping head 5, until the two clamping pads 55 clamp the tapping head 5 from both sides. Since the clamping pad 55 is rotatably connected to the end of the threaded rod 53, the clamping pad 55 can maintain a relatively stable clamping posture during the rotation and feeding process of the threaded rod 53, thus avoiding the clamping pad 55 from scratching the surface of the tapping head 5 due to synchronous rotation with the threaded rod 53. After the mounting sleeve 52 clamps the tapping head 5, the electric telescopic rod 51 is controlled to retract, and the mounting sleeve 52 moves upward with the electric telescopic rod 51. The two clamping pads 55 drive the tapping head 5 to move upward along its own axis. During this process, the threaded rod 53 will slide upward in the vertical groove 54, so that the threaded end of the tapping head 5 gradually passes through the inside of the test sleeve 59. The inner diameter of the test sleeve 59 is matched with the outer dimensions of the threaded end of the tapping head 5. Only a test gap is reserved between them to allow normal passage. Therefore, when the axis of the tapping head 5 is basically vertical and there is no obvious bending, the threaded end of the tapping head 5 can pass smoothly along the center position of the test sleeve 59. The tapping head 5 will not produce an obvious eccentric pushing effect on the inner wall of the test sleeve 59. The test sleeve 59 and the rod sliding plate 58 fixedly connected to the test sleeve 59 remain in the normal test position. The contact sensor 510 will not be abnormally triggered. Based on this, it can be determined that the tapping head 5 is within the allowable verticality range.

[0042] When the tapping head 5 is bent, misaligned, or its threaded end is not aligned with the axis of the chuck 4, during the upward movement of the tapping head 5 by the electric telescopic rod 51, the misaligned threaded end of the tapping head 5 will first contact the inner wall of one side of the test sleeve 59. Since the tapping head 5 continues to move upward, the misaligned tapping head 5 will exert a pushing force on the test sleeve 59, causing the test sleeve 59 to undergo axial displacement relative to the chuck 4. When the test sleeve 59 displaces, it will simultaneously drive the rod-mounted sliding plate 58, which is fixedly connected to it, to slide inside the arc-shaped sleeve 56, and cause the support spring 57 to undergo elastic deformation. As the displacement of the rod-mounted sliding plate 58 gradually increases, when the degree of misalignment of the tapping head 5 reaches the set allowable deviation value, the rod-mounted sliding plate 58 triggers the contact sensor 510. The contact sensor 510 transmits the detection signal to the control system of the tapping machine 2, thereby determining that the tapping head 5 is currently misaligned. At this point, the subsequent tapping action is stopped, and the electric telescopic rod 51 is controlled to reset. The operator can readjust the installation position of the tapping head 5. If it is still detected as misaligned after reinstallation, the tapping head 5 can be removed and replaced to avoid the tapping head 5 with slight bending or misalignment defects from directly participating in thread cutting.

[0043] Compared to workers directly observing with the naked eye whether the tapping head 5 has slightly bent, this structure uses a test sleeve 59 that matches the external dimensions of the threaded end of the tapping head 5 to convert the small radial deviation of the tapping head 5 into a mechanical displacement that can be detected by the test sleeve 59 and the sliding plate 58 with the rod. Then, the contact sensor 510 is used to judge the state, so that slight deviations that are difficult to be detected by the naked eye can be detected more intuitively, thus improving the accuracy of the inspection before the tapping head 5 is used.

[0044] It should be noted that during normal tapping, the mounting sleeve 52 causes the clamping pad 55 to separate from the tapping head 5 and remain in a clearance position. The tapping head 5 is mainly fixed and the rotational torque is transmitted by the chuck 4, so as to avoid the skew detection mechanism from exerting additional constraints on the tapping head 5 during the high-speed rotation and axial feed of the tapping head 5.

[0045] Example 2

[0046] Please see Figure 1 , Figure 3 , Figure 4 and Figure 7 , Figure 8 The automatic feeding clamping fixture table 6 is equipped with two pneumatic clamping plates 61, and the base 1 is equipped with a pneumatic feeding plate 62 on the side. The automatic feeding clamping fixture table 6 is also equipped with a feeding frame 7 on one side. The pneumatic feeding plate 62 is provided with a receiving groove at one end near the feeding frame 7, and the bottom of the receiving groove is provided with a round hole to facilitate the removal of unqualified connecting nuts.

[0047] The rejection assembly also includes an L-shaped plate 63 fixedly connected to one side of the automatic feeding clamping fixture 6. A small electric cylinder 64 is fixedly connected to the L-shaped plate 63. A hollow cylinder 65 is fixedly connected to the movable end of the small electric cylinder 64. A piston sleeve 66 is slidably connected inside the hollow cylinder 65. A test head 67 is threadedly connected to the lower end of the piston sleeve 66. The piston sleeve 66 consists of a piston plate and a threaded sleeve. The inner diameter of the lower end of the hollow cylinder 65 is smaller than the size of the piston plate to prevent the piston sleeve 66 from detaching from the lower end of the hollow cylinder 65.

[0048] A contact sensor 610 is fixedly connected to the top of the inner cavity of the hollow cylinder 65. An air pipe 611 is fixedly connected to the outer surface of the hollow cylinder 65 near the upper part. A piston cylinder 612 is fixedly connected to the lower surface of the automatic feeding clamping fixture 6 near the discharge plate 68. One end of the air pipe 611 that passes through the L-shaped plate 63 is fixedly connected to the piston cylinder 612. A piston plate 613 with a rod is slidably connected to the inner surface of the piston cylinder 612. The piston plate 613 with a rod consists of a rod and a piston plate. One end of the rod of the piston plate 613 that passes through the piston cylinder 612 is fixedly connected to the side wall of the discharge plate 68.

[0049] It should be noted that the two pneumatic clamping plates 61 are arranged on the automatic feeding and clamping fixture table 6. They rely on cylinder drive to achieve synchronous clamping and releasing of the workpiece. After the nut workpiece is delivered to the position, the two pneumatic clamping plates 61 clamp and limit it from both sides to eliminate gaps and offsets in the workpiece placement, ensuring that the workpiece does not shake during processing. After processing, one of the pneumatic clamping plates 61 automatically releases the clamp, and the other pneumatic clamping plate 61 pushes the finished product out of the material. One side of the feeding frame 7 is connected to the vibrating feeding plate, which receives the student bed welding nut connectors that are orderly discharged from the vibrating feeding plate. Then, the cylinder of the pneumatic feeding plate 62 pneumatically drives the receiving groove to approach the feeding frame 7, so that the nut can enter the receiving groove. Then, the pneumatic feeding plate 62 pushes it close to the pneumatic clamping plate 61, and the pneumatic clamping plate 61 pushes it away from the receiving groove of the pneumatic feeding plate 62 and closes it to the other pneumatic clamping plate 61 for clamping. The above is the operation process of the existing automatic nut feeding mechanism.

[0050] When a nut enters the receiving slot of the pneumatic feeding plate 62, the pneumatic feeding plate 62 drives the nut forward via a cylinder to the automatic feeding clamping fixture 6. After the program controls the nut to move directly below the test head 67, the small electric cylinder 64 starts, driving the test head 67 downward through the hollow cylinder 65 and piston sleeve 66 until it is inserted into the pre-drilled hole in the center of the nut. If the hole is not angled, the test head 67 will move downward and contact the automatic feeding clamping fixture 6. At this time, the small electric cylinder 64 will drive the test head 67 upward to reset, allowing the qualified nut to be fed by the pneumatic feeding plate 62 into one of the pneumatic clamps 61. At this time, the program starts the pneumatic clamp near the nut. Plate 61 extends, allowing pneumatic clamp 61 to push away the nut located in the receiving groove of pneumatic feed plate 62. Then, pneumatic clamp 61 resets, allowing pneumatic feed plate 62 to retract and approach the loading frame 7 again to receive the next nut. The previous nut is held by two pneumatic clamps 61. At this time, tapping machine 2 drives tapping head 5 to descend, and the spindle of tapping machine 2, through the cooperation of rotating sleeve 3 and chuck 4, drives the held tapping head 5 to rotate and descend to cut the thread hole in the nut. Meanwhile, pneumatic feed plate 62 drives the next nut for testing. If a nut with a pre-drilled hole is detected as an angled hole, the test head 67, which matches the nut's hole, cannot descend smoothly but is blocked by the inclined pre-drilled hole wall. Due to the small electric... As cylinder 64 extends, and test head 67 remains stationary due to resistance, hollow cylinder 65 continues to descend. Piston sleeve 66 moves within hollow cylinder 65 as it descends, compressing the gas inside and releasing it through air pipe 611 into piston cylinder 612. The gradually filling piston cylinder 612 pushes the piston plate 613 with rod towards the auxiliary spring 69. The piston plate 613 then drives the discharge plate 68 to slide at the bottom of the automatic feeding clamping fixture 6, gradually stretching the two auxiliary springs 69. When hollow cylinder 65 continues to descend until piston sleeve 66 contacts contact sensor 610, small electric cylinder 64... The plate then remains stationary for a few seconds, at which point the discharge plate 68 slides to the side of the automatic feeding clamping fixture 6, exposing the round hole at the bottom of the receiving groove of the pneumatic feeding plate 62. This allows unqualified nuts to fall through the round hole at the bottom of the receiving groove from the bottom of the automatic feeding clamping fixture 6, thus achieving the effect of automatically rejecting unqualified nuts after inspection. The nuts are first inspected by the test head 67, and only those that pass the inspection are sent to the tapping station, avoiding ineffective tapping of oblique hole nuts. Nuts with oblique hole defects fall and separate directly, and are not sent to the tapping station, preventing semi-finished products with oblique hole defects from continuing to be tapped and forming unqualified threads. It also prevents the tapping head 5 from being subjected to force on one side and twisting and breaking due to forced tapping of oblique hole workpieces.

[0051] When the aforementioned defective nut falls off, the small electric cylinder 64 resets upwards, and the test head 67 no longer contacts the nut. At this time, the two auxiliary springs 69 drive the discharge plate 68 to slide back to its original position. When the discharge plate 68 moves, it also drives the piston plate 613 with rod to move back to its original position. The piston plate 613 with rod is pushed by the auxiliary springs 69 to move the discharge plate 68, which will compress the gas in the piston cylinder 612 again and return it to the hollow cylinder 65 through the air pipe 611. The hollow cylinder 65 gradually fills with gas, which will compress the piston sleeve 66 and the test head 67 to their initial state, making it easier to test the next nut. Moreover, the test head 67 will wear, bend slightly, and scratch due to repeated insertion into the metal nut hole over a long period of time. Therefore, the test head 67 can be replaced separately after deformation. Simply rotate the test head 67 and unscrew it from one end of the piston sleeve 66 for replacement.

[0052] Furthermore, when the oblique hole blocking test head 67 is used, the hollow cylinder 65 and the piston sleeve 66 form a pneumatic buffer structure. The rigid impact is absorbed by the gas buffer, and it will not hard push against the small electric cylinder 64 and the test head 67, reducing the risk of overload damage to the small electric cylinder 64 and bending deformation of the test head 67.

[0053] When the pre-drilled hole of the nut is correctly positioned and the hole axis is within the allowable perpendicularity range, the test head 67 can smoothly enter and pass through the pre-drilled hole of the nut. During this process, the test head 67 is not significantly obstructed by the inner wall of the pre-drilled hole. Therefore, there will be no relative displacement between the piston sleeve 66 and the hollow cylinder 65 that reaches the abnormal detection threshold. The gas in the hollow cylinder 65 will not be forced into the piston cylinder 612 in large quantities. The piston plate 613 with rod and the discharge plate 68 continue to remain in their original positions, and the contact sensor 610 will not generate an abnormal detection signal. When the small electric cylinder 64 completes the preset detection stroke, it retracts upward, thus determining that the pre-drilled hole of the nut is qualified.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tapping machine for processing connecting parts of a student bed, comprising a base (1) and a tapping machine (2), characterized in that: The tapping machine (2) is mounted on the base (1). The output shaft end of the tapping machine (2) is fixedly connected to a rotating sleeve (3). The lower end of the rotating sleeve (3) is clamped with a chuck (4). The chuck (4) holds the tapping head (5). The rotating sleeve (3) is equipped with a lifting detection component for detecting the deviation of the tapping head (5). The detection component includes an electric telescopic rod (51) fixedly connected to the top of the inner cavity of the rotating sleeve (3). The lower end of the electric telescopic rod (51) is fixedly connected to an installation sleeve (52) for holding the tapping head (5) and driving the tapping head (5) to move axially upward. The outer surface of the tapping head (5) is also fitted with a test sleeve (59) for detection. The inner diameter of the test sleeve (59) is matched with the outer diameter of the thread section of the tapping head (5). An automatic feeding clamping fixture (6) is installed on the upper surface of the base (1). The automatic feeding clamping fixture (6) is equipped with a detection and rejection component for detecting the misalignment of the pre-drilled hole of the connector and rejecting unqualified connectors. The rejection component includes a test head (67) that moves down and inserts into the pre-drilled hole of the connector. A discharge plate (68) for rejecting unqualified connectors by translation is slidably connected on the automatic feeding clamping fixture (6). Two auxiliary springs (69) for helping the discharge plate (68) to reset are fixedly connected between the discharge plate (68) and the side wall of the automatic feeding clamping fixture (6).

2. The tapping machine for processing student bed connectors according to claim 1, characterized in that: The detection assembly also includes threaded rods (53) threaded to both sides of the mounting sleeve (52). One end of the threaded rod (53) that penetrates into the inner side of the mounting sleeve (52) is rotatably connected to a clamping pad (55). The outer surface of the rotating sleeve (3) has two vertical grooves (54) corresponding to the position of the threaded rod (53). One end of the threaded rod (53) passes through the vertical groove (54). The bottom of the chuck (4) is fixedly connected to an arc sleeve (56). A sliding plate (58) with a rod is slidably connected inside the arc sleeve (56). The sliding plate (58) with a rod consists of an arc plate and two sliding rods. Multiple support springs (57) are fixedly connected between the arc plate of the sliding plate (58) and the arc sleeve (56).

3. The tapping machine for processing student bed connectors according to claim 2, characterized in that: The rods of the sliding plate (58) all extend through the lower surface of the arc sleeve (56). One end of the rods of the sliding plate (58) extending through the arc sleeve (56) is fixedly connected to the test sleeve (59) by bolts. A contact sensor (510) is fixedly connected to the bottom of the inner cavity of the arc sleeve (56).

4. The tapping machine for processing student bed connectors according to claim 1, characterized in that: Two L-shaped slots (41) are opened on the outer surface of the rotating sleeve (3) near the chuck (4), and two clamping heads (42) that are adapted to the L-shaped slots (41) are fixedly connected to the upper surface of the chuck (4).

5. A tapping machine for processing student bed connectors according to claim 1, characterized in that: The automatic feeding clamping fixture (6) is equipped with two pneumatic clamping plates (61), and the base (1) is equipped with a pneumatic feeding plate (62) on the side. The automatic feeding clamping fixture (6) is also equipped with a feeding frame (7) on one side. The pneumatic feeding plate (62) is provided with a receiving groove at the end near the feeding frame (7), and the bottom of the receiving groove is provided with a round hole to facilitate the removal of unqualified connecting nuts.

6. A tapping machine for processing student bed connectors according to claim 5, characterized in that: The rejection assembly also includes an L-shaped plate (63) fixedly connected to one side of the automatic feeding clamping fixture (6). A small electric cylinder (64) is fixedly connected to the L-shaped plate (63). A hollow cylinder (65) is fixedly connected to the movable end of the small electric cylinder (64). A piston sleeve (66) is slidably connected inside the hollow cylinder (65). A test head (67) is threadedly connected to the lower end of the piston sleeve (66). The piston sleeve (66) consists of a piston plate and a threaded sleeve.

7. A tapping machine for processing student bed connectors according to claim 6, characterized in that: A contact sensor 2 (610) is fixedly connected to the top of the inner cavity of the hollow cylinder (65). An air pipe (611) is fixedly connected to the outer surface of the hollow cylinder (65) near the top. A piston cylinder (612) is fixedly connected to the lower surface of the automatic feeding clamping fixture (6) near the discharge plate (68). One end of the air pipe (611) that passes through the L-shaped plate (63) is fixedly connected to the piston cylinder (612).

8. A tapping machine for processing student bed connectors according to claim 7, characterized in that: A piston plate (613) with a rod is slidably connected to the inner surface of the piston cylinder (612). The piston plate (613) with a rod consists of a rod and a piston plate. One end of the rod of the piston plate (613) that passes through the piston cylinder (612) is fixedly connected to the side wall of the discharge plate (68).

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