Automatic detection device for screw thread opening

Abstract

The present application relates to the field of screw detection, especially to a screw tooth opening automatic detection device, a gantry loaded with a plurality of screw driving manipulators is arranged on the upper part of the machine table, a material guide frame is arranged on one side below the screw driving manipulators to provide materials, and a plurality of detection barrels are arranged on the other side to realize detection work. In the present application, after the screw is screwed into the detection barrel, a closed cavity is formed with the detection barrel, and the screw tooth surface extrudes the detection probe. When the missing tooth part enters the arc cavity, the chamber volume increases, the air pressure decreases, and the pressure sensing module is triggered to unlock the valve ball through the electromagnetic mechanism. When the detection probe extends into the missing tooth part, the valve ball moves synchronously with the probe to open. Under the action of continuous airflow, the pigment is sprayed out of the detection probe by negative pressure, the defective part is automatically detected and marked, and the automatic detection function of the screw tooth opening 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:

[0007] 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.

[0008] 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.

[0009] The excitation block is fixedly installed on the inner wall of the detection chamber, the inner cavity of the excitation block is provided with a flow channel, the inner wall of the flow channel is provided with a valve seat on one side, the bottom of the valve seat is connected with the pigment tank through a suction pipe, the top of the valve seat is tightly sealed with a valve ball, the valve ball is connected with the top wall of the detection chamber through a spring, the top end of the valve ball is provided with a connecting rope, the top end of the connecting rope extends out of the excitation block and is connected with the detection probe;

[0010] One side of the valve ball is provided with a clamping groove, a wedge-shaped block is clamped in the clamping groove, the wedge-shaped block is installed in the mounting groove on the inner wall of the valve seat through a spring, a magnetic block is installed in the inside of the wedge-shaped block, an electromagnet is installed on the side away from the magnetic block, and the electromagnet is installed on the outer wall of the excitation block.

[0011] Preferably, the machine table is provided with a horizontal movement driving mechanism on both sides of the upper part of the machine table, a gantry is driven and installed on the horizontal movement driving mechanism to realize the horizontal movement function of the whole frame body, and a plurality of screw driving robots are arranged on the gantry to perform the screw driving process.

[0012] Preferably, the machine table is provided with a lifting feeding mechanism on one side, the top discharge port of the lifting feeding mechanism is connected with the feeding area on the upper part of the machine table 1, a plurality of guide frames are arranged in the feeding area, and one side of the guide frame extends downward to the working area of the screw driving robot.

[0013] Preferably, the air inlet groove is provided with a pressure relief valve at one end to discharge gas, and the air outlet groove is provided with a gas inlet pipe at one end, and the gas inlet pipe is connected with an external gas source mechanism to introduce gas.

[0014] Preferably, the detection chamber is provided with a secondary groove on both sides, the secondary grooves are respectively connected with the air inlet groove and the air outlet groove, and the secondary grooves are inclinedly arranged along the air inlet direction of the air inlet groove and the air outlet direction of the air outlet groove.

[0015] One side of the air inlet groove is provided with a connecting pipe, the connecting pipe is installed in the secondary groove on the air inlet groove and is connected with the inside of the excitation block in the detection chamber.

[0016] Preferably, the outer wall of the excitation block is provided with a permanent magnet two on one side, a permanent magnet one is installed on the inner wall of the detection probe away from the permanent magnet two, the permanent magnet one and the permanent magnet two are symmetrically arranged and have a gap, and the permanent magnet one and the permanent magnet two repel each other.

[0017] The hollow rubber pad is arranged between the detection probe and the sliding bushing, and the detection probe and the hollow rubber pad are in contact in a natural state.

[0018] Preferably, the valve seat is connected with a suction pipe at the bottom, the suction pipe extends downward and is connected with the pigment tank, and the pigment tank is arranged in the inside of the detection cylinder.

[0019] Preferably, one side of the inside of the detection chamber is fixedly provided with a sliding bushing, a detection probe is limitingly arranged in the inside of the sliding bushing, the main body of the detection probe can smoothly slide along the sliding bushing, and the tip of the detection probe penetrates into the arc-shaped cavity and extends to the middle region of the threaded groove on the inner wall of the detection cylinder.

[0020] Preferably, one end of the detection probe is provided with a sealing plug, the sealing plug is a conical structure and is arranged at one end of the detection probe by a cross body, and in a natural state, the sealing plug naturally blocks the excitation block port arranged in the inside of the detection probe.

[0021] Preferably, one side of the excitation block extends to the outside of the detection probe, a guide block is arranged at the extension section, an arc-shaped groove body for arranging a connecting rope is arranged in the guide block, and one end of the connecting rope is connected with the detection probe.

[0022] The beneficial effects of the present application are:

[0023] In the present application, after the screw is screwed into the detection cylinder, a closed cavity is formed by the detection cylinder, and the tooth surface of the screw extrudes the detection probe; when the toothless part 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 by the electromagnetic mechanism; when the detection probe extends into the toothless part, the valve ball moves synchronously with the probe to open; under the action of continuous airflow, the pigment is sprayed from the detection probe by negative pressure to detect and mark the tooth defect part, and the automatic detection function of the screw tooth is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The present application provides an external structure diagram of a screw tooth automatic detection device;

[0025] Figure 2 The present application provides an installation structure diagram of a material guide frame;

[0026] Figure 3 The present application provides a position structure diagram of a material guide frame and a detection cylinder;

[0027] Figure 4 The present application provides a gantry installation structure diagram;

[0028] Figure 5 The present application provides a detection cylinder structure diagram;

[0029] Figure 6 The present application provides a screw workpiece and detection cylinder connection structure diagram;

[0030] Figure 7 The present application provides a detection cylinder local structure sectional view;

[0031] Figure 8The top view of the internal structure of the detection cylinder proposed in the application;

[0032] Figure 9 The schematic diagram of the arc-shaped cavity connecting structure proposed in the application;

[0033] Figure 10 The schematic diagram of the pigment tank structure proposed in the application;

[0034] Figure 11 The schematic diagram of the internal structure of the sliding bushing proposed in the application;

[0035] Figure 12 The sectional view of the connecting structure of the excitation block and the detection probe proposed in the application;

[0036] Figure 13 The schematic diagram of the installation structure of the permanent magnet one and the permanent magnet two proposed in the application;

[0037] Figure 14 The schematic diagram of the valve ball installation structure proposed in the application;

[0038] Figure 15 The schematic diagram of the structure at A proposed in the application;

[0039] Figure 16 The schematic diagram of the external structure of the detection probe proposed in the application.

[0040] In the figure: 1, machine table; 101, feeding area; 2, lifting feeding mechanism; 3, material frame; 4, gantry; 41, horizontal movement driving mechanism; 42, screwing mechanical hand; 5, guide frame; 6, support frame; 7, detection cylinder; 71, thread groove; 72, arc-shaped cavity; 8, gas conveying pipe; 9, pressure relief valve; 10, detection probe; 11, gas inlet groove; 111, auxiliary groove; 112, connecting pipe; 12, gas outlet groove; 13, sliding bushing; 14, excitation block; 141, flow-through groove; 142, permanent magnet two; 15, detection chamber; 16, permanent magnet one; 17, electromagnet; 18, spring one; 19, pressure sensing module; 20, valve ball; 201, valve seat; 202, clamping groove; 21, connecting rope; 22, suction pipe; 23, pigment tank; 24, guide block; 25, installation groove; 26, hollow rubber pad; 27, sealing plug; 28, wedge-shaped block; 281, spring two; 282, magnetic block. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0042] REFERENCE Figures 1-6, screw tooth mouth automatic detection device, including machine table 1, machine table 1 is installed through horizontal movement driving mechanism 41 with gantry 4 to realize the whole body driving horizontal movement function, a plurality of screwing mechanical hands 42 are configured on gantry 4, for executing screwing process;

[0043] The inclined lower side of the gantry 4 is provided with a guide frame 5 for feeding, and the other side is provided with a supporting frame 6 for detection. After the screw workpiece is fed on the guide frame 5, it is picked up by the screwing mechanical hand 42 and moved to the detection cylinder 7 above the supporting frame 6 to complete the detection process.

[0044] The middle part of the guide frame 5 is provided with a guide groove, which allows the screw rod part of the screw to naturally sag through, while the larger diameter screw head is naturally supported and separated on the upper supporting surface of the guide frame 5 due to structural limitations. This is easy to understand intuitively and will not be explained.

[0045] Among them, a plurality of detection cylinders 7 are installed on the upper part of the supporting frame 6, and each detection cylinder 7 is provided with a spiral groove matched with the screw workpiece. The inner side of the spiral groove is provided with a plurality of arc cavities 72 staggered upward and downward. The arc cavities 72 are arranged under the premise of maintaining the continuity of the spiral groove and not interfering with the engagement of the screw, ensuring smooth feeding and stable positioning of the screw during detection.

[0046] Among them, two arc cavities 72 correspond to two position detection areas, which are easy to understand intuitively and will not be explained.

[0047] Further, one side of the machine table 1 is provided with a lifting feeding mechanism 2, and the top discharge port of the lifting feeding mechanism 2 is connected with the upper feeding area 101 of the machine table 1. The feeding area 101 is provided with a guide frame 5, and the screw workpiece is lifted and conveyed by the lifting feeding mechanism 2, and the feeding operation is completed in the feeding area 101 and the guide frame 5.

[0048] Among them, the lifting feeding mechanism 2 belongs to the conventional automatic feeding device in the field, which is a mature product that can be directly purchased and used. Its specific structure and working principle are known to those skilled in the art, and will not be described here.

[0049] Further, the upper part of the machine table 1 is provided with a horizontal movement driving mechanism 41, and the horizontal movement driving mechanism 41 is drivingly connected with the gantry 4 to control the horizontal movement of the gantry.

[0050] In addition, a material frame 3 is placed on the side away from the supporting frame 6 to collect the screw workpiece after detection.

[0051] Further, the same number of detection cylinders 7 as the guide frame 5 are installed on the supporting frame 6, and the detection cylinders 7 are through from top to bottom.

[0052] Referring to Figures 6-16The outer two sides of the detection cylinder 7 are horizontally provided with air inlet grooves 11, which extend to the inside of the cylinder body and communicate with the corresponding arc-shaped cavities 72, and the other side of the arc-shaped cavities 72 is horizontally provided with air outlet grooves 12;

[0053] The two ends of the arc-shaped cavities 72 are connected with the air inlet grooves 11 and the air outlet grooves 12 respectively, and together form a U-shaped chamber.

[0054] One end of the air inlet groove 11 is provided with a gas conveying pipe 8, which is connected with an external gas source mechanism to convey gas into the air inlet groove 11;

[0055] In addition, one side of the air outlet groove 12 is provided with a pressure relief valve 9, which discharges the gas with excess pressure in the U-shaped chamber.

[0056] Further, a detection chamber 15 is provided between the air inlet groove 11 and the air outlet groove 12, a sliding bushing 13 is fixedly installed on one side of the inside of the detection chamber 15, a detection probe 10 is limitingly installed in the inside of the sliding bushing 13, the main part of the detection probe 10 can smoothly slide along the sliding bushing 13, and the tip probe part of the detection probe 10 penetrates into the arc-shaped cavity 72 and extends to the middle region of the thread groove 71 on the inner wall of the detection cylinder 7;

[0057] When the screw workpiece is screwed into the inside of the detection cylinder 7, the helical teeth mesh with the thread groove 71, and during the rotation process, the tip of the detection probe 10 is subjected to extrusion force, which pushes the detection probe 10 to slide backward, and in addition, the two sides of the tip of the detection probe 10 are designed as a rounded structure, which facilitates smooth contact with the screw workpiece and reduces interference;

[0058] In addition, after the screw workpiece is completely installed in the detection cylinder 7, the outer wall together with the arc-shaped cavity 72, the air inlet groove 11 and the air outlet groove 12 forms a closed cavity.

[0059] One end of the detection probe 10 is provided with a slot, which communicates with the internal cavity, and a sealing plug 27 is installed at the slot through a crossbar, the sealing plug 27 is conical and extends inwardly and is clamped into the inlet of the flow-through groove 141 on the internal excitation block 14, so as to realize the sealing and blocking of the flow-through groove 141.

[0060] Further, a sub-groove 111 is provided on both sides of the detection chamber 15, which respectively communicates with the air inlet groove 11 and the air outlet groove 12, and the sub-groove 111 is inclinedly provided along the air inlet direction of the air inlet groove 11 and the air outlet direction of the air outlet groove 12, so as to ensure smooth airflow.

[0061] The air outlet groove 12 sends the gas into the detection chamber 15 through the sub-groove 111;

[0062] The air intake slot 11 sends gas into the connecting pipe 112 through the secondary channel 111.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] The side of the excitation block 14 extends outside the detection probe 10, and a guide block 24 is installed at the extension section. The connecting rope 21 extends from 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, the connecting rope 21 is pulled tight, thereby driving the valve ball 20 to lift upward, so that the valve seat 201 is connected.

[0072] Further, a pressure sensing module 19 is installed on one side of the inner wall of the detection chamber 15, and the opposite side of the pressure sensing module 19 is provided with the excitation block 14. The sensing end of the pressure sensing module 19 is inside the detection chamber 15.

[0073] The inner wall of the valve seat 201 is provided with a mounting groove 25, and a wedge-shaped block 28 is installed in the mounting groove 25. The wedge-shaped block 28 extends from one side of the mounting groove 25, and the other side is connected to the inner wall of the mounting groove 25 through a spring 281.

[0074] The inside of the mounting groove 25 is provided with a magnetic block 282, and the side away from the magnetic block 282 is provided with an electromagnet 17. The electromagnet 17 is installed on one side of the bottom of the excitation block 14, and the electromagnet 17 is electrically connected to the pressure sensing module 19.

[0075] In this embodiment, the screw workpiece is oriented and lifted by the lifting feeding mechanism 2. The screw falls from the discharge port to the guide frame 5 at the top of the lifting mechanism, that is, the feeding area 101.

[0076] Due to the structural characteristics of the screw workpiece, there is a difference in diameter between the screw head and the screw rod part, so that the screw is separated and distributed in the middle guide groove of the guide frame 5. Then, the screw workpiece slides smoothly along the guide frame 5 with a certain inclination angle and is guided to the material taking station of the screw driving mechanical hand 42.

[0077] Then, the transverse driving mechanism 41 drives the gantry 4 and the screw driving mechanical hand 42 carried thereon to move to the guide frame 5. After the mechanical hand performs the grabbing operation, the screw is moved and positioned into the detection cylinder 7 on the support frame 6 on the other side of the device, and the screw workpiece is screwed into the threaded groove 71 in the middle of the detection cylinder 7.

[0078] At the same time, the external air source mechanism continuously delivers gas to the detection cylinder 7 through the gas delivery pipe 8. The gas flows through the gas inlet groove 11, the arc-shaped cavity 72 and the gas outlet groove 12 in turn.

[0079] When the screw is screwed into the detection cylinder 7, the screw thread closely cooperates with the threaded groove 71, so that one end of the arc-shaped cavity 72 is in a sealed state. At this time, the gas inlet groove 11, the arc-shaped cavity 72 and the gas outlet groove 12 together form a closed chamber, and the overpressure gas in the chamber is discharged through the pressure relief valve 9 at the gas outlet groove 12.

[0080] With the continuous supply of gas source, the gas gradually fills the chamber, and enters the detection chamber 15 through the sub-channel 111 at one end of the exhaust groove 12, and exerts a stable pressure on the sensing end of the pressure sensing module 19 arranged therein. At this time, the internal gas pressure of the arc-shaped cavity 72 is in a balanced state, that is, one end continuously admits gas, and the other end discharges overpressure gas through the pressure relief valve 9. The balanced gas pressure simultaneously exerts a squeezing action on the pressure sensing module 19, but the pressure value has not yet reached the excitation threshold set by the module.

[0081] Then, when the screw is screwed into the detection cylinder 7, the screw thread comes into contact with the detection probe 10 located in the middle of the detection cylinder 7, and exerts pressure on the probe to make it retreat backward. At this time, the distance between the permanent magnet one 16 mounted on the detection probe 10 and the permanent magnet two 142 on the excitation block 14 decreases, and the magnetic repulsion force generated between the two increases significantly.

[0082] As the screw workpiece is screwed in, its continuous screw thread will pass through the arc-shaped cavity 72 opened on the inner wall of the detection cylinder 7 in sequence, and when the screw thread has a significant missing tooth (which affects the performance of the screw), the side gap of the missing tooth will enter one side of the arc-shaped cavity 72 once, and the overall cavity space of the arc-shaped cavity 72 will become larger. At this time, the gas pressure will fluctuate, that is, the gas pressure will decrease. At this time, the pressure sensing module 19 senses that the gas pressure has decreased to the corresponding excitation threshold, and performs a single excitation operation. Through the external control mechanism, the electromagnet 17 located at the bottom of the excitation block 14 is energized, causing the wedge-shaped block 28 at the valve seat 201 inside the excitation block 14 to retract under the electromagnetic attraction and disengage from the clamping groove 202 opened on 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.

[0083] Subsequently, when the missing tooth moves to the detection probe 10, the detection probe 10 originally under compression will be quickly ejected and displaced into the gap due to the release of the magnetic repulsion force between the permanent magnet one 16 and the permanent magnet two 142. At this time, the detection probe 10 will lift the valve ball 20 through the linkage connecting rope 21.

[0084] When the detection probe 10 is extended, its movement causes the sealing plug 27 originally blocking the outlet of the flow-through groove 141 of the excitation block 14 to disengage, thereby opening the passage. Since the excitation block 14 is connected to the air inlet groove 11 through the connecting pipe 112, continuous airflow fills the flow-through groove 141 inside the excitation block 14 and is quickly ejected after the passage is opened.

[0085] Since the valve ball 20 is lifted synchronously with the displacement of the detection probe 10, that is, the valve seat 201 is flowing, the pigment in the pigment tank 23 is extracted through the suction pipe 22 under negative pressure. After the pigment is mixed with the airflow, it is ejected through the flow-through groove 141 of the excitation block 14, realizing the detection and marking operation of the missing tooth part of the screw.

[0086] Subsequently, the hollow rubber pad 26 arranged at the front end of the detection probe 10 will buffer the fast-extended detection probe 10, so as to reset it stably.

[0087] Finally, the detected screw workpiece will be screwed out by the screwing manipulator 42 and picked up into the material frame 3 placed on the upper part of the machine table 1 to complete the collection.

[0088] In actual application, due to the spring 281 in the installation groove 25 tightly pressing the wedge block 28, the wedge block 28 is stably clamped in the clamping groove 202 of the valve ball 20, so that the valve ball 20 cannot be lifted, avoiding the situation that the detection probe 10 is displaced and misoperated due to small missing teeth.

[0089] In actual application, when the screw head is rotated to be separated from the arc-shaped cavity 72, the detection probe 10 is retracted, at this time, the connecting rope 21 is not taut and the spring 281 drives the valve ball 20 to be pressed on the valve seat 201 again.

[0090] Therefore, especially for the defect position of the screw head, the existing technology cannot physically detect and mark the screw head gap, and the device can effectively detect and mark the missing tooth position of the screw head gap by rotating the screw workpiece into the detection cylinder 7 and cooperating the detection probe 10 with the pressure sensing module 19 and other components.

[0091] In addition, it should be noted that the specific structure and working principle of the lifting feeding mechanism 2 and the screw feeding thereof which are not described in detail above are common knowledge of those skilled in the art. The mechanism is used to realize the automatic lifting and conveying of screws and provides the workpiece to be taken for the manipulator, which belongs to the conventional configuration in the automatic assembly equipment and will not be described here.

[0092] Moreover, the screwing mechanism is composed of the screwing manipulator 42, the gantry 4 and the horizontal movement driving mechanism 41. The horizontal movement driving mechanism 41 can be a servo electric sliding table module, a screw sliding table mechanism or a linear motor driving module, which cooperates with an external control mechanism to accurately move the gantry 4 and the loaded screwing manipulator 42 along a predetermined trajectory. The gantry 4 serves as the installation and bearing basis of the screwing manipulator 42 and provides structural support and motion guidance for the screwing manipulator 42.

[0093] The screwing manipulator 42 can be directly purchased and used on the market. The specific mechanical structure, driving and control principle thereof are common technical means in the art and are common knowledge of those skilled in the art, which will not be described here.

[0094] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

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). 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. 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). 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. 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).

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, 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).

5. The automatic screw thread detection device according to claim 4, 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).

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

Images