Screw thread mouth automatic detection device

Abstract

The invention relates to the field of screw detection, in particular to an automatic screw thread opening detection device, a portal frame loaded with a plurality of screw driving manipulators is arranged on the upper portion of a machine table, a material guide frame is arranged on one side below the screw driving manipulators to provide materials, and a plurality of detection cylinders are arranged on the other side below the screw driving manipulators to achieve detection operation. According to the invention, after the screw is screwed into the detection cylinder, the screw and the detection cylinder form a closed cavity, meanwhile, the tooth surface of the screw extrudes the detection probe, when the tooth-missing part enters the arc-shaped cavity, the volume of the cavity is increased, the air pressure is reduced and the pressure sensing module is triggered to unlock the valve ball through the electromagnet mechanism, and when the detection probe extends into the tooth-missing part, the valve ball moves synchronously with the probe to be opened. Under the action of continuous airflow, the pigment is sprayed out from the detection probe by means of negative pressure, and the defect part is automatically detected and marked, so that the automatic detection function of the screw thread is realized.

Description

Technical Field

[0001] This invention relates to the field of screw inspection technology, and more particularly to an automatic screw thread inspection device. Background Technology

[0002] During the screw manufacturing process, due to improper process parameters and other reasons, various defects inevitably appear on the thread teeth. Among them, "missing teeth" (i.e., partial missing or damaged thread profile) is a common quality defect that has a significant impact on product performance.

[0003] In the existing technology, some screw thread inspection operations are carried out using machine vision technology, and screw workpieces with thread defects are collected in a centralized manner.

[0004] However, in practical applications, even if a missing tooth is detected, such devices cannot accurately detect and mark the specific location of the defect in physical space. They can only achieve a single detection effect, and the defective product must be completely discarded and recycled. This makes it difficult to carry out subsequent repair operations (for some customized screws made of special materials or with special shapes, it is not economical to scrap the whole product due to minor local defects. It is perfectly feasible to carry out a repair process of local welding and re-tapping). Therefore, traditional devices have defects in tooth detection and urgently need to be improved. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic screw thread detection device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automatic screw thread detection device includes a machine base. The upper part of the machine base is equipped with a gantry frame that carries multiple screw-driving robots. A guide frame is provided on one side of the screw-driving robots to provide materials, and multiple detection cylinders are provided on the other side to realize the detection operation. The detection cylinder has a through threaded groove in the middle. Multiple arc-shaped cavities are staggered on the inner side of the threaded groove. An air inlet groove and an exhaust groove are connected to the two sides of the arc-shaped cavities respectively. A detection chamber is opened between the air inlet groove and the exhaust groove. A pressure sensing module is installed on one side of the detection chamber, and a detection probe is installed on the other side by a sliding bushing. An excitation block is installed inside the detection probe. The excitation block is fixedly installed on the inner wall of the detection chamber. The inner cavity of the excitation block has a flow groove. A valve seat is provided on one side of the inner wall of the flow groove. The bottom of the valve seat is connected to the pigment tank through an extraction tube, and a valve ball is pressed and sealed on the top. The valve ball is connected to the top wall of the detection chamber through a spring. A connecting rope is provided at the middle of the top of the valve ball. The top of the connecting rope extends out of the excitation block and is connected to the detection probe. A snap-fit ​​groove is provided on one side of the valve ball, and a wedge block is snapped into the snap-fit ​​groove. The wedge block is installed in the mounting groove opened in the inner wall of the valve seat by a spring. A magnetic block is installed inside the wedge block, and an electromagnet is installed on the side away from the magnetic block. The electromagnet is installed on the outer wall side of the excitation block.

[0007] Preferably, a transverse drive mechanism is installed on both sides of the upper part of the machine platform, and a gantry frame is driven on the transverse drive mechanism to realize the overall transverse drive function of the frame. Multiple screw-driving robots are configured on the gantry frame to perform the screw-driving process.

[0008] Preferably, a lifting and feeding mechanism is provided on one side of the machine base. The top discharge port of the lifting and feeding mechanism is connected to the feeding area on the upper part of the machine base 1. Multiple guide frames are installed in the feeding area. One side of the guide frame extends downward to the working area of ​​the screw-driving robot.

[0009] Preferably, a pressure relief valve is installed at one end of the air inlet slot to discharge gas, and an air supply pipe is installed at one end of the exhaust slot, the air supply pipe being connected to an external gas source mechanism to introduce gas.

[0010] Preferably, the detection chamber has secondary channels on both sides, which are connected to the air inlet channel and the air outlet channel respectively, and the secondary channels are inclined along the air inlet direction of the air inlet channel and the air outlet direction of the air outlet channel. A connecting pipe is provided on one side of the air inlet slot. The connecting pipe is installed in the secondary channel on the air inlet slot and is connected to the excitation block inside the detection chamber.

[0011] Preferably, a second permanent magnet is mounted on one side of the outer wall of the excitation block, and a first permanent magnet is mounted on the side away from the second permanent magnet. The first permanent magnet is mounted on the inner wall of the detection probe, and the first permanent magnet and the second permanent magnet are symmetrically arranged with a gap between them. The first permanent magnet and the second permanent magnet repel each other. A hollow rubber pad is provided between the detection probe and the sliding bushing. Under normal conditions, the detection probe and the hollow rubber pad remain in contact.

[0012] Preferably, the bottom of the valve seat is connected to an extraction tube, which extends downward and is connected to a pigment container, which is assembled inside the detection cylinder.

[0013] Preferably, a sliding bushing is fixedly installed on one side of the inner side of the detection chamber, and a detection probe is installed inside the sliding bushing. The main body of the detection probe can slide smoothly along the sliding bushing, and the tip of the detection probe penetrates into the arc-shaped cavity and extends to the middle area of ​​the threaded groove on the inner wall of the detection cylinder.

[0014] Preferably, a sealing plug is installed at one end of the detection probe. The sealing plug has a conical structure and is installed at one end of the detection probe by a cross-shaped body. In its natural state, the sealing plug naturally seals the excitation block port configured inside the detection probe.

[0015] Preferably, one side of the excitation block extends outside the detection probe, and a guide block is installed at the extension. The guide block has an arc-shaped groove for installing a connecting rope, and one end of the connecting rope is connected to the detection probe.

[0016] The beneficial effects of this invention are as follows: In this invention, after the screw is screwed into the detection cylinder, it forms a sealed cavity with the detection cylinder. At the same time, the screw teeth press against the detection probe. When the missing tooth enters the arc-shaped cavity, the cavity volume increases, the air pressure decreases, and the pressure sensing module is triggered to unlock the valve ball through the electromagnet mechanism. When the detection probe extends into the missing tooth, the valve ball will move synchronously with the probe and open. Under the action of continuous airflow, the pigment is sprayed out from the detection probe by negative pressure to detect and mark the defective tooth, thereby realizing the automatic detection function of screw teeth. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the automatic screw thread detection device proposed in this invention; Figure 2 This is a schematic diagram of the guide frame installation structure proposed in this invention; Figure 3 This is a schematic diagram of the position structure of the guide frame and detection cylinder proposed in this invention; Figure 4 This is a schematic diagram of the gantry frame installation structure proposed in this invention; Figure 5 This is a schematic diagram of the detection cylinder structure proposed in this invention; Figure 6 This is a schematic diagram of the connection structure between the screw workpiece and the detection cylinder proposed in this invention; Figure 7 This is a partial cross-sectional view of the detection cylinder proposed in this invention; Figure 8 This is a top view of the internal structure of the detection cylinder proposed in this invention; Figure 9 This is a schematic diagram of the arc-shaped cavity connection structure proposed in this invention; Figure 10 This is a schematic diagram of the pigment can structure proposed in this invention; Figure 11 This is an exploded view of the internal structure of the sliding bushing proposed in this invention; Figure 12 This is a cross-sectional view of the connection structure between the excitation block and the detection probe proposed in this invention; Figure 13 This is a schematic diagram of the installation structure of permanent magnet one and permanent magnet two proposed in this invention; Figure 14 This is a schematic diagram of the valve ball mounting structure proposed in this invention; Figure 15This is a schematic diagram of the structure at point A proposed in this invention; Figure 16 This is a schematic diagram of the external structure of the detection probe proposed in this invention.

[0018] In the diagram: 1. Machine base; 101. Feeding area; 2. Lifting and feeding mechanism; 3. Material frame; 4. Gantry frame; 41. Lateral drive mechanism; 42. Screw-driving robot; 5. Guide frame; 6. Support frame; 7. Detection cylinder; 71. Threaded groove; 72. Arc cavity; 8. Air supply pipe; 9. Pressure relief valve; 10. Detection probe; 11. Air inlet groove; 111. Secondary channel; 112. Connecting pipe; 12. Exhaust groove; 13. Sliding bushing; 14. Excitation block ; 141. Flow channel; 142. Permanent magnet II; 15. Detection chamber; 16. Permanent magnet I; 17. Electromagnet; 18. Spring I; 19. Pressure sensing module; 20. Valve ball; 201. Valve seat; 202. Snap-fit ​​groove; 21. Connecting rope; 22. Extraction tube; 23. Pigment container; 24. Guide block; 25. Mounting groove; 26. Hollow rubber pad; 27. Sealing plug; 28. Wedge block; 281. Spring II; 282. Magnetic block. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figure 1-6 The automatic screw thread detection device includes a machine base 1. A gantry frame 4 is installed on the machine base 1 through a transverse drive mechanism 41 to realize the overall drive transverse movement function of the frame. Multiple screw-driving robots 42 are configured on the gantry frame 4 to perform the screw-driving process. A guide frame 5 for loading is set on one side of the gantry frame 4 at an angle below it, and a support frame 6 for inspection is set on the other side. After the screw workpiece is loaded on the guide frame 5, the screw-driving robot 42 picks up the corresponding workpiece and transfers it to the inspection cylinder 7 above the support frame 6 to complete the inspection process.

[0021] The guide rack 5 has a guide groove in the middle, which allows the screw shank to hang down naturally and pass through. The screw head with a larger diameter is naturally supported and placed on the upper support surface of the guide rack 5 due to structural limitations. This is easy to understand intuitively and will not be explained further.

[0022] Among them, the upper part of the support frame 6 is equipped with multiple detection cylinders 7. Each detection cylinder 7 has a spiral groove inside that matches the screw workpiece. Multiple arc-shaped cavities 72 are arranged in an alternating manner on the inner side of the spiral groove. The arc-shaped cavities 72 are arranged to ensure the smooth feeding and stable positioning of the screw during the detection process while maintaining the continuity of the spiral groove and not interfering with the screw meshing. Among them, the two arc-shaped cavities 72 correspond to the detection areas at two locations, which is easy to understand intuitively and will not be explained further.

[0023] Furthermore, a lifting and feeding mechanism 2 is provided on one side of the machine base 1. The top discharge port of the lifting and feeding mechanism 2 is connected to the feeding area 101 on the upper part of the machine base 1. A guide frame 5 is installed in the feeding area 101. After the screw workpiece is lifted and conveyed by the lifting and feeding mechanism 2, the feeding operation is completed in the feeding area 101 and the guide frame 5. Among them, the lifting and feeding mechanism 2 is a conventional automated feeding device in the field. It is a commercially available and mature product that can be directly purchased and used. Its specific structure and working principle are common knowledge to those skilled in the art, and will not be described in detail here.

[0024] Furthermore, the upper two sides of the machine base 1 are equipped with transverse drive mechanisms 41, and the transverse drive mechanisms 41 are connected to the gantry frame 4 to control the frame to move transversely.

[0025] In addition, a material box 3 is placed on the side away from the support frame 6 to collect the inspected screw parts.

[0026] Furthermore, the same number of detection cylinders 7 as the guide frame 5 are installed on the support frame 6, with the detection cylinders 7 having a through-hole design at the top and bottom.

[0027] Reference Figure 6-16 The outer sides of the detection cylinder 7 are provided with horizontal air inlet grooves 11, which extend into the cylinder and communicate with the corresponding arc-shaped cavity 72. The other side of the arc-shaped cavity 72 is provided with horizontal exhaust grooves 12. The two ends of the arc-shaped cavity 72 are connected to the air inlet groove 11 and the exhaust groove 12 respectively, forming a U-shaped cavity together.

[0028] One end of the air inlet 11 is equipped with an air supply pipe 8, which is connected to an external air source mechanism to supply air into the air inlet 11. In addition, a pressure relief valve 9 is installed on one side of the exhaust duct 12, which discharges the overpressured gas in the U-shaped chamber.

[0029] Furthermore, a detection chamber 15 is provided between the air inlet groove 11 and the exhaust groove 12. A sliding bushing 13 is fixedly installed on one side inside the detection chamber 15. A detection probe 10 is installed inside the sliding bushing 13. The main body of the detection probe 10 can slide smoothly along the sliding bushing 13, and the tip of the detection probe 10 penetrates into the arc-shaped cavity 72 and extends to the middle area of ​​the threaded groove 71 on the inner wall of the detection cylinder 7. When the screw workpiece is screwed into the inside of the detection cylinder 7, its helical teeth mesh with the thread groove 71, and apply a squeezing force to the tip of the detection probe 10 during the rotation, pushing the detection probe 10 to slide backward. In addition, the tip of the detection probe 10 is designed with rounded corners on both sides to facilitate smooth contact with the screw workpiece and reduce interference. Furthermore, after the screw workpiece is fully inserted into the testing cylinder 7, its outer wall, together with the arc-shaped cavity 72, the air inlet groove 11, and the exhaust groove 12, forms a sealed cavity.

[0030] The detection probe 10 has a slot in the middle of one end, which is connected to its internal cavity. A sealing plug 27 is installed at the slot via a cross. The sealing plug 27 is conical and extends inward to fit into the entrance of the flow groove 141 opened on the internal excitation block 14, thereby sealing and blocking the flow groove 141.

[0031] Furthermore, secondary channels 111 are provided on both sides of the detection chamber 15. The secondary channels 111 are connected to the air inlet channel 11 and the exhaust channel 12 respectively. The secondary channels 111 are inclined along the air inlet direction of the air inlet channel 11 and the exhaust direction of the exhaust channel 12 to ensure smooth airflow.

[0032] Among them, the exhaust duct 12 sends gas into the detection chamber 15 through the secondary duct 111; The air intake slot 11 sends gas into the connecting pipe 112 through the secondary channel 111.

[0033] Furthermore, an excitation block 14 is embedded inside the detection probe 10. The detection probe 10 can achieve horizontal displacement relative to the excitation block 14, and the outer wall of the excitation block 14 is a rectangular structure to effectively constrain the circumferential rotation of the detection probe 10 and ensure that it only makes linear displacement along a preset direction.

[0034] One side of the excitation block 14 is fixedly installed on the bottom wall of the detection chamber 15 and cooperates with the sliding bushing 13 to provide support for the detection probe 10 and guide it to achieve smooth horizontal sliding. The excitation block 14 has a flow groove 141 inside. One end of the flow groove 141 is open and the other end of the flow groove 141 is equipped with a connecting pipe 112. One side of the connecting pipe 112 is connected to the air inlet groove 11 through the secondary channel 111. The airflow entering through the air inlet groove 11 enters the connecting pipe 112 and the flow groove 141 along the secondary channel 111.

[0035] Furthermore, a permanent magnet 142 is installed on one side of the outer wall of the excitation block 14, and a permanent magnet 16 is installed on one side of the inner wall of the detection probe 10. The permanent magnet 16 and the permanent magnet 142 are symmetrically arranged and have a gap. The permanent magnet 16 and the permanent magnet 142 repel each other, thereby applying a thrust to the detection probe 10 in the direction of the center of the detection cylinder 7.

[0036] A hollow rubber pad 26 is provided between the detection probe 10 and the sliding bushing 13. Under natural conditions, the detection probe 10 maintains contact with the hollow rubber pad 26 under the repulsive force generated by the permanent magnet 142.

[0037] In addition, a valve seat 201 is provided on the bottom wall of the side facing the connecting pipe 112 inside the excitation block 14. The valve seat 201 is through the middle and connected to the bottom of the extraction pipe 22. The extraction pipe 22 extends downward and is connected to the pigment tank 23. The pigment tank 23 is assembled inside the detection cylinder 7. Among them, a valve ball 20 is adapted to be installed on the valve seat 201. The valve ball 20 and the valve seat 201 fit together to form a sealing mechanism to achieve the closure of the extraction tube 22. The upper part of the valve seat 201 is connected to the upper wall of the flow groove 141 through a spring 18. The spring 18 can constrain the valve ball 20 to move in the vertical direction.

[0038] Among them, a connecting rope 21 is installed in the middle of the upper end of the valve ball 20. The connecting rope 21 extends upward and passes through the guide block 24 on the upper part of the excitation block 14. An arc-shaped groove is opened inside the guide block 24 for the connecting rope 21 to pass through. The outlet of the arc-shaped groove faces the detection probe 10. One side of the excitation block 14 extends out of the detection probe 10. A guide block 24 is installed at this extension. The connecting rope 21 extends out through one end of the guide block 24 and is connected to the outer wall of the detection probe 10. When the detection probe 10 moves, it will pull the connecting rope 21 to tighten, thereby causing the valve ball 20 to rise upward, so that the valve seat 201 is connected.

[0039] Furthermore, a pressure sensing module 19 is installed on one side of the inner wall of the detection chamber 15, and an excitation block 14 is arranged directly opposite the pressure sensing module 19, wherein the sensing end of the pressure sensing module 19 is located inside the detection chamber 15.

[0040] Among them, an installation groove 25 is provided on one side of the inner wall of the valve seat 201. A wedge block 28 is installed in the installation groove 25. One tip of the wedge block 28 extends out of the installation groove 25, and the other side is connected to the inner wall of the installation groove 25 through a spring 281. A magnetic block 282 is installed inside the mounting slot 25. An electromagnet 17 is provided on the side away from the magnetic block 282. The electromagnet 17 is installed at the bottom of one side of the excitation block 14 and is electrically connected to the pressure sensing module 19.

[0041] In this embodiment, the lifting and feeding mechanism 2 lifts and conveys the screw workpiece in a directional manner. After the screw moves up to the top with the lifting mechanism, it falls down from the discharge port to a place in the guide frame 5, namely the feeding area 101. Due to the structural characteristics of the screw workpiece itself, there is a diameter difference between the screw head and the screw shaft, which causes the screw to be separated and distributed in the middle guide groove of the guide frame 5. Subsequently, the screw workpiece slides down smoothly along the guide frame 5 with a certain inclination angle by its own weight and is guided and transported to the picking station of the screw-driving robot 42.

[0042] Then, the transverse drive mechanism 41 drives the gantry frame 4 and the screw-driving robot 42 mounted on it to move to the guide frame 5. After the robot performs the gripping operation, it transfers the screw and positions it into the detection cylinder 7 on the support frame 6 on the other side of the device, and screws the screw workpiece into the thread groove 71 in the middle of the detection cylinder 7.

[0043] At the same time, the external gas source mechanism continuously supplies gas to the detection cylinder 7 through the gas supply pipe 8, and the gas flows through the inlet groove 11, the arc-shaped cavity 72 and the exhaust groove 12 in sequence. When the screw is screwed into the inside of the detection cylinder 7, its helical teeth and the threaded groove 71 form a tight fit, so that one end of the arc-shaped cavity 72 is in a sealed state. At this time, the air inlet groove 11, the arc-shaped cavity 72 and the exhaust groove 12 together form a closed chamber, and the overpressure gas in the chamber is discharged through the pressure relief valve 9 at the exhaust groove 12.

[0044] As the gas source continues to supply gas, the gas gradually fills the chamber and enters the detection chamber 15 through the secondary channel 111 at one of the exhaust channels 12. It applies a stable pressure to the sensing end of the pressure sensing module 19 installed therein. At this time, the gas pressure inside the arc-shaped cavity 72 is in a balanced state, that is, one end continues to receive gas, while the other end discharges overpressure gas through the pressure relief valve 9. This balanced gas pressure also exerts a squeezing effect on the pressure sensing module 19, but its pressure value has not yet reached the excitation threshold set by the module.

[0045] Next, when the screw is screwed into the detection cylinder 7, its helical teeth come into contact with the detection probe 10 located in the middle of the detection cylinder 7 and apply pressure to the probe to make it retract. At this time, the distance between the permanent magnet 16 mounted on the detection probe 10 and the permanent magnet 142 on the excitation block 14 decreases, and the magnetic repulsion force generated between them increases significantly.

[0046] As the screw is screwed in, its continuous helical teeth pass through the arc-shaped cavity 72 opened in the inner wall of the detection cylinder 7 in sequence. When there are obvious missing teeth on the helical teeth (affecting the screw performance), once the missing tooth side enters the arc-shaped cavity 72, the overall cavity space of the arc-shaped cavity 72 will increase. At this time, the air pressure will fluctuate to a certain extent, that is, the air pressure will decrease. When the pressure sensing module 19 senses that the air pressure has decreased to the corresponding excitation threshold, it will perform a single excitation operation. The external control mechanism drives the electromagnet 17 located at the bottom of the excitation block 14 to be energized, causing the wedge block 28 at the valve seat 201 inside the excitation block 14 to retract under electromagnetic attraction and disengage from the locking groove 202 opened in the outer wall of the valve ball 20 in the middle of the valve seat 201. At this time, the valve ball 20 is unlocked. Subsequently, when the missing tooth moves to the detection probe 10, due to the obvious concave structure of the missing tooth, the detection probe 10, which was originally compressed, will be quickly ejected into the notch due to the release of the magnetic repulsion between permanent magnet 16 and permanent magnet 142. At this time, the detection probe 10 will link with the connecting rope 21 to lift the valve ball 20. When the detection probe 10 extends, its movement causes the sealing plug 27, which was originally blocking the outlet of the flow channel 141 of the excitation block 14, to disengage, thereby opening the channel. Since the excitation block 14 is connected to the air inlet slot 11 through the connecting pipe 112, a continuous airflow can fill the flow channel 141 inside it and be quickly ejected after the channel is opened.

[0047] As the valve ball 20 is simultaneously detected by the displacement of the probe 10, it is lifted, that is, the valve seat 201 is open. The pigment in the pigment tank 23 is drawn out by the extraction tube 22 through the negative pressure. After the pigment is mixed with the airflow, it is sprayed out through the flow groove 141 of the excitation block 14, so as to realize the detection and marking operation of the missing thread part of the screw.

[0048] Subsequently, the hollow rubber pad 26 set at the front end of the detection probe 10 will buffer the rapidly extending detection probe 10, causing it to return to its original position smoothly.

[0049] Finally, the screw workpiece after inspection will be screwed out again by the screw-driving robot 42 and picked up into the material box 3 placed on the upper part of the machine 1 for collection.

[0050] In practical applications, under natural conditions, the spring 281 in the mounting groove 25 presses against the wedge block 28, making it securely engaged in the side engagement groove 202 of the valve ball 20. This prevents the valve ball 20 from being lifted, thus avoiding accidental contact due to displacement of the detection probe 10 caused by small missing teeth.

[0051] In practical applications, when the screw teeth rotate and disengage from the arc cavity 72, the detection probe 10 retracts again. At this time, the connecting rope 21 is no longer taut and the spring 281 drives the valve ball 20 to press back onto the valve seat 201.

[0052] Therefore, especially for defective parts of screw threads, where existing technologies cannot physically detect and mark the missing screw threads, this device can effectively detect and mark the missing screw threads by screwing the screw workpiece into the detection cylinder 7. During this process, the detection probe 10 and pressure sensing module 19 and other components work together to detect and mark the missing screw threads.

[0053] In addition, it should be noted that the specific structure and working principle of the lifting and feeding mechanism 2 and its screw feeding, which are not described in detail above, are common knowledge to those skilled in the art. This mechanism is used to realize the automatic lifting and conveying of screws and to provide the robot with the workpiece to be picked up. It is a standard configuration in automated assembly equipment and will not be described in detail here. Moreover, the screw-driving robot 42, the gantry 4, and the transverse drive mechanism 41 together constitute the screw-driving mechanism. The transverse drive mechanism 41 can be a servo electric slide module, a lead screw slide mechanism, or a linear motor drive module. In conjunction with an external control mechanism, it is used to drive the gantry 4 and the loaded screw-driving robot 42 to move precisely along a predetermined trajectory. The gantry 4 serves as the mounting and bearing foundation for the screw-driving robot 42, providing it with structural support and motion guidance. Among them, the screw-driving robot 42 can be directly purchased and used on the market. Its specific mechanical structure, drive and control principles are all conventional technical means in this field and common knowledge to those skilled in the art, so they will not be described in detail here.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic screw thread detection device, comprising a machine base (1), characterized in that, The machine (1) is equipped with a gantry (4) on the upper part, which is loaded with multiple screw-driving robots (42). A guide frame (5) is provided on one side below the screw-driving robot (42) to provide materials, and multiple detection cylinders (7) are provided on the other side to realize detection operations. The detection cylinder (7) has a through threaded groove (71) in the middle. Multiple arc-shaped cavities (72) are staggered on the inner side of the threaded groove (71). An air inlet groove (11) and an exhaust groove (12) are connected to the two sides of the arc-shaped cavity (72). A detection chamber (15) is opened between the air inlet groove (11) and the exhaust groove (12). A pressure sensing module (19) is provided on one side of the detection chamber (15), and a detection probe (10) is installed on the other side by a sliding bushing (13). An excitation block (14) is installed inside the detection probe (10). The excitation block (14) is fixedly installed on the inner wall of the detection chamber (15). The inner cavity of the excitation block (14) is provided with a flow groove (141). A valve seat (201) is provided on one side of the inner wall of the flow groove (141). The bottom of the valve seat (201) is connected to the pigment tank (23) through the extraction tube (22), and the top is pressed and sealed with a valve ball (20). The valve ball (20) is connected to the top wall of the detection chamber (15) through a spring (18). A connecting rope (21) is provided in the middle of the top of the valve ball (20). The top of the connecting rope (21) extends out of the excitation block (14) and is connected to the detection probe (10). A snap-fit ​​groove (202) is provided on one side of the valve ball (20), and a wedge block (28) is snapped in the snap-fit ​​groove (202). The wedge block (28) is installed in the mounting groove (25) opened on the inner wall of the valve seat (201) by a spring (281). A magnetic block (282) is installed inside the wedge block (28), and an electromagnet (17) is installed on the side away from the magnetic block (282). The electromagnet (17) is installed on the outer wall side of the excitation block (14).

2. The automatic screw thread detection device according to claim 1, characterized in that, The machine base (1) is equipped with a transverse drive mechanism (41) on both sides of the upper part. The transverse drive mechanism (41) drives the gantry frame (4) to realize the overall drive transverse movement function of the frame. The gantry frame (4) is equipped with multiple screw-driving robots (42) to perform the screw-driving process.

3. The automatic screw thread detection device according to claim 1, characterized in that, The machine base (1) is equipped with a lifting and feeding mechanism (2) on one side. The top discharge port of the lifting and feeding mechanism (2) is connected to the feeding area (101) on the upper part of the machine base 1. Multiple guide frames (5) are installed in the feeding area (101). One side of the guide frame (5) extends downward to the working area of ​​the screw-driving robot (42).

4. The automatic screw thread detection device according to claim 1, characterized in that, One end of the air inlet slot (11) is equipped with a pressure relief valve (9) to discharge gas, and one end of the exhaust slot (12) is equipped with an air supply pipe (8), which is connected to an external gas source mechanism to introduce gas.

5. The automatic screw thread detection device according to claim 1, characterized in that, The detection chamber (15) has secondary channels (111) on both sides. The secondary channels (111) are connected to the air inlet channel (11) and the exhaust channel (12) respectively. The secondary channels (111) are opened at an angle along the air inlet direction of the air inlet channel (11) and the exhaust direction of the exhaust channel (12). A connecting pipe (112) is provided on one side of the air inlet slot (11). The connecting pipe (112) is installed in the secondary channel (111) on the air inlet slot (11) and is connected to the inside of the excitation block (14) inside the detection chamber (15).

6. The automatic screw thread detection device according to claim 1, characterized in that, The outer wall of the excitation block (14) is equipped with a second permanent magnet (142) on one side and a first permanent magnet (16) on the side away from the second permanent magnet (142). The first permanent magnet (16) is installed on the inner wall of the detection probe (10), and the first permanent magnet (16) and the second permanent magnet (142) are symmetrically arranged with a gap. The first permanent magnet (16) and the second permanent magnet (142) repel each other. A hollow rubber pad (26) is provided between the detection probe (10) and the sliding bushing (13). Under normal conditions, the detection probe (10) and the hollow rubber pad (26) remain in contact.

7. The automatic screw thread detection device according to claim 1, characterized in that, The bottom of the valve seat (201) is connected to an extraction tube (22), which extends downward and is connected to the pigment tank (23), which is installed inside the detection cylinder (7).

8. The automatic screw thread detection device according to claim 1, characterized in that, A sliding bushing (13) is fixedly installed on one side of the inner side of the detection chamber (15). A detection probe (10) is installed inside the sliding bushing (13). The main body of the detection probe (10) can slide smoothly along the sliding bushing (13), and the tip of the detection probe (10) penetrates into the arc-shaped cavity (72) and extends to the middle area of ​​the threaded groove (71) on the inner wall of the detection cylinder (7).

9. The automatic screw thread detection device according to claim 8, characterized in that, A sealing plug (27) is installed at one end of the detection probe (10). The sealing plug (27) has a conical structure and is installed at one end of the detection probe (10) by a cross-shaped body. In its natural state, the sealing plug (27) naturally seals the port of the excitation block (14) configured inside the detection probe (10).

10. The automatic screw thread detection device according to claim 1, characterized in that, One side of the excitation block (14) extends out of the detection probe (10), and a guide block (24) is installed at the extension. An arc-shaped groove for installing the connecting rope (21) is opened in the guide block (24), and one end of the connecting rope (21) is connected to the detection probe (10).

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