Thread detection device

Abstract

The invention relates to the field of precision manufacturing, and aims at providing a thread detection device which comprises a first electric sliding rail and a second electric sliding rail, a posture adjusting mechanism is arranged on a sliding part of the first electric sliding rail, a clamping mechanism is connected to the posture adjusting mechanism, and the clamping mechanism is connected with a clamping mechanism. A multi-axis mechanical arm is installed on a sliding part of the second electric sliding rail, a first motor is fixedly arranged on the multi-axis mechanical arm, and a thread detection mechanism is connected to an output shaft of the first motor; the thread detection mechanism comprises a mounting plate, the front side of the mounting plate is connected with an output shaft of a first motor, the rear side of the mounting plate is provided with at least two groups of tooth gauge detectors, the detection end of one group of tooth gauge detectors is detachably connected with a go gauge detection head, and the detection end of the other group of tooth gauge detectors is detachably connected with a no-go gauge detection head. According to the invention, automatic detection of the threaded hole of the workpiece can be realized, the detection efficiency and precision are improved, and the stability and reliability of the detection process are ensured.

Description

Technical Field

[0001] The present invention relates to the field of precision manufacturing, and specifically to a thread detection device. Background Art

[0002] In the field of precision manufacturing, machining deviations of workpiece thread holes may affect the assembly quality. For example, an over-sized thread hole may cause loose fitting, affecting the reliability and service life of the product; an under-sized thread hole may lead to difficult assembly or even inability to install, requiring rework, thus increasing production costs. Therefore, the detection of thread hole dimensions is particularly important.

[0003] Currently, thread detection mainly uses traditional go-no-go gauges for detection, that is, by screwing in a go gauge not larger than the thread hole and a no-go gauge not smaller than the thread hole to determine whether the thread hole meets the assembly requirements. However, this method mainly relies on manual operation, with low detection efficiency and difficulty in meeting the requirements of mass production. At the same time, the torque for manually screwing in the go-no-go gauges is difficult to unify, with a large degree of subjectivity, and may lead to misjudgment due to improper operation, affecting the stability of detection. Summary of the Invention

[0004] The purpose of the present invention is to provide a thread detection device that can achieve automatic detection of workpiece thread holes, improve detection efficiency and accuracy, and ensure the stability and reliability of the detection process.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A thread detection device includes a first electric slide rail extending forward and backward and a second electric slide rail extending upward and downward. The second electric slide rail is installed on the front side of the first electric slide rail. An attitude adjustment mechanism is fixedly provided on the sliding part of the first electric slide rail. A clamping mechanism for clamping the workpiece is movably connected to the attitude adjustment mechanism. A multi-axis robotic arm is installed on the sliding part of the second electric slide rail. A first motor is fixedly provided on the execution part of the multi-axis robotic arm. A thread detection mechanism cooperating with the clamping mechanism is fixedly connected to the output shaft of the first motor.

[0007] The thread detection mechanism includes a mounting plate. The front side of the mounting plate is fixedly connected to the output shaft of the first motor. At least two sets of thread gauge detectors are installed on the rear side of the mounting plate. The detection ends of the two sets of thread gauge detectors are arranged in opposite directions. A go gauge detection head is detachably connected to the detection end of one set of thread gauge detectors, and a no-go gauge detection head is detachably connected to the detection end of the other set of thread gauge detectors.

[0008] Compared with the prior art, the advantages of the present invention are:

[0009] 1. Through the cooperation of the first electric slide rail, the second electric slide rail, the multi-axis robotic arm, the first motor, the clamping mechanism, and the thread detection mechanism, the automatic detection of the threaded holes of the workpiece can be realized, greatly improving the detection efficiency, reducing the human error, and improving the detection accuracy;

[0010] 2. By setting the thread gauge detector, the go gauge detection head, and the no-go gauge detection head, the go gauge detection head and the no-go gauge detection head are driven by the coaxial motor to perform thread engagement with the threaded hole to be detected, so as to judge whether the diameter of the threaded hole meets the requirements; when the go gauge detection head can smoothly screw into the threaded hole, while the no-go gauge detection head cannot screw into the same threaded hole, it can be judged that the threaded hole is manufactured qualified; and through the cooperation of the ball spline shaft assembly, the limit retaining ring, and the compression spring, the thread gauge detector can achieve buffering and reset during the detection process, thus effectively improving the detection stability of the go gauge detection head and the no-go gauge detection head; in addition, by setting the first motor, the mounting plate can be driven to rotate after the go gauge detection head completes the detection, so that the no-go gauge detection head enters the detection position, thereby realizing continuous detection and improving the detection efficiency;

[0011] 3. By setting the second motor, the swing frame, and the third motor, the clamping mechanism can achieve two-axis displacement, so that the workpiece can swing at multiple angles, further adapting the thread detection mechanism to detect the threaded holes at different positions, and improving the adaptability and detection coverage rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of an embodiment of a thread detection device of the present invention;

[0013] Figure 2 is Figure 1 the top view structure diagram of;

[0014] Figure 3 is a schematic structural diagram of the thread detection mechanism of the present invention;

[0015] Figure 4 is a schematic structural diagram of the thread gauge detector of the present invention;

[0016] Figure 5 is Figure 4 the exploded view of the structure of;

[0017] Figure 6 is a sectional view of the structure of the attitude adjustment mechanism of the present invention;

[0018] Figure 7 is Figure 6 the three-dimensional structure diagram of;

[0019] Figure 8 is the rear view of the partial structure of the present invention.

[0020] Label description: 1. First electric slide rail; 11. Ball screw linear slide rail; 12. Guide rail; 13. Photoelectric induction groove; 14. Light-shielding baffle; 2. Second electric slide rail; 3. Attitude adjustment mechanism; 31. Fixed frame; 32. Swing frame; 33. Second motor; 34. Third motor; 35. First synchronous pulley; 36. Second synchronous pulley; 37. Synchronous belt; 4. Clamping mechanism; 41. Workbench; 42. Corner pressing cylinder; 43. Positioning column; 5. Multi-axis robotic arm; 6. First motor; 7. Thread detection mechanism; 71. Mounting plate; 72. Thread gauge detector; 721. Through-shaft motor; 7221. Spline shaft; 7222. Ball spline nut; 723. Coupling; 724. Floating reamer head; 725. Limit retaining ring; 726. Compression spring; 727. Spring cover; 73. Go-gauge detection head; 74. No-go-gauge detection head. Detailed implementation mode

[0021] The following describes the content of the present invention in detail with reference to the accompanying drawings of the specification and embodiments:

[0022] As Figure 1-8 shown, it is a schematic diagram of an embodiment of a thread detection device provided by the present invention:

[0023] A thread detection device includes a first electric slide rail 1 extending forward and backward and a second electric slide rail 2 extending upward and downward. The second electric slide rail 2 is installed on the front side of the first electric slide rail 1. An attitude adjustment mechanism 3 is fixedly provided on the sliding part of the first electric slide rail 1. A clamping mechanism 4 for clamping a workpiece is movably connected to the attitude adjustment mechanism 3. A multi-axis robotic arm 5 is installed on the sliding part of the second electric slide rail 2. A first motor 6 is fixedly provided on the execution part of the multi-axis robotic arm 5. A thread detection mechanism 7 cooperating with the clamping mechanism 4 is fixedly connected to the output shaft of the first motor 6;

[0024] The thread detection mechanism 7 includes a mounting plate 71. The front side of the mounting plate 71 is fixedly connected to the output shaft of the first motor 6. At least two groups of thread gauge detectors 72 are installed on the rear side of the mounting plate 71. The detection ends of the two groups of thread gauge detectors 72 are arranged in opposite directions. A go-gauge detection head 73 is detachably connected to the detection end of one group of thread gauge detectors 72, and a no-go-gauge detection head 74 is detachably connected to the detection end of the other group of thread gauge detectors 72.

[0025] Specifically, the size specification of the go-gauge detection head 73 should be smaller than that of the no-go-gauge detection head 74. The go-gauge detection head 73 preferably has a size specification of M12, and the no-go-gauge detection head 74 preferably has a size specification of M14.

[0026] The thread gauge detector 72 includes a through-shaft motor 721, a ball spline shaft assembly, a coupling 723, and a floating reamer head 724 for connecting a go-gauge detection head 73 or a no-go-gauge detection head 74;

[0027] Specifically, the floating reamer head 724 is a prior art. After the floating reamer head 724 is connected to the go-gauge detection head 73 or the no-go-gauge detection head 74, it allows the go-gauge detection head 73 or the no-go-gauge detection head 74 to adaptively float and compensate within a certain range, so as to better adapt to the slight deviation of the threaded hole, and thus improve the smoothness and accuracy of the detection.

[0028] The ball spline shaft assembly includes a spline shaft 7221 and a ball spline nut 7222 sleeved on the spline shaft 7221. The spline shaft 7221 and the ball spline nut 7222 are inserted through the through-shaft cavity of the through-shaft motor 721, and the ball spline nut 7222 is connected to the driving part of the through-shaft motor 721;

[0029] A limit retaining ring 725, two compression springs 726, and a spring cover 727 are sleeved on the spline shaft 7221. The spring cover 727 is fixedly covered on the upper end of the through-shaft cavity. The two compression springs 726 are axially limited between the ball spline nut 7222 and the spring cover 727; the limit retaining ring 725 is fixed on the spline shaft 7221 and located between the two compression springs 726, and the limit retaining ring 725 is in limit cooperation with the compression springs 726 on both sides;

[0030] Further, the limit retaining ring 725 and the spline shaft 7221 are tightly fitted and connected;

[0031] The two compression springs 726 are axially limited between the ball spline nut 7222 and the spring cover 727, that is, the top end of the upper compression spring 726 is in limit cooperation with the spring cover 727, and the bottom end of the lower compression spring 726 is in limit cooperation with the ball spline nut 7222. In this embodiment, the ball spline nut 7222 is fixedly connected to the driving part of the through-shaft motor 721 through a connecting shaft, and the lower end of the lower compression spring 726 directly abuts against the connecting shaft.

[0032] One end of the coupling 723 is connected to the lower end of the spline shaft 7221, and the other end of the coupling 723 is connected to the floating reamer head 724.

[0033] The posture adjusting mechanism 3 includes a fixed frame 31 and a swing frame 32. The fixed frame 31 is fixedly arranged on the sliding part of the first electric slide rail 1. The swing frame 32 is rotatably connected between the left and right side walls of the fixed frame 31. A second motor 33 is installed on the outer side wall of the fixed frame 31. The output shaft of the second motor 33 penetrates through the side wall of the fixed frame 31 and is connected to the swing frame 32. The output shaft of the second motor 33 extends left and right.

[0034] The clamping mechanism 4 is rotatably connected to the top side of the swing frame 32. A third motor 34 directly or indirectly driving the clamping mechanism 4 is installed at the bottom of the swing frame 32. The output shaft of the third motor 34 extends up and down.

[0035] A first synchronous pulley 35 is sleeved on the output shaft of the third motor 34. The bottom of the clamping mechanism 4 penetrates through the top side of the swing frame 32, and a second synchronous pulley 36 is also sleeved on the bottom of the clamping mechanism 4. A synchronous belt 37 is drivingly connected between the first synchronous pulley 35 and the second synchronous pulley 36.

[0036] The first electric slide rail 1 includes a lead screw linear slide rail 11 and a guide rail 12 which are distributed at intervals left and right. One end of the posture adjusting mechanism 3 is fixedly connected to the sliding part of the lead screw linear slide rail 11, and the other end is slidably connected to the guide rail 12.

[0037] Photoelectric induction grooves 13 are provided at both the front and rear ends of the first electric slide rail 1. The photoelectric induction grooves 13 are used to sense the traveling state of the sliding part of the first electric slide rail 1. A light-shielding stop piece 14 matched with the photoelectric induction grooves 13 is fixedly arranged on the bottom side of the sliding part of the first electric slide rail 1.

[0038] The clamping mechanism 4 includes a workbench 41 and a plurality of corner pressing cylinders 42. The bottom of the workbench 41 is rotatably connected to the posture adjusting mechanism 3. A plurality of positioning columns 43 are arranged on the top side of the workbench 41. The plurality of positioning columns 43 correspond one by one to the positioning holes of the external workpiece.

[0039] The corner pressing cylinders 42 are installed on the top side of the workbench 41. When the rocker arms of the corner pressing cylinders 42 tighten downward, the workpiece can be clamped on the workbench 41.

[0040] There are four groups of thread gauge detectors 72 in total. The four groups of thread gauge detectors 72 are divided into two pairs and are respectively arranged on the left and right sides of the mounting plate; in each pair, the detection ends of the two groups of thread gauge detectors 72 are arranged in opposite directions, and a go-gauge detection head 73 is detachably connected to the detection end of one group, and a no-go-gauge detection head 74 is detachably connected to the detection end of the other group.

[0041] The working process of the present invention is generally as follows:

[0042] The workpiece is placed on the clamping mechanism 4 located at the initial position (i.e., the rear end of the first electric slide rail 1) by an external loading and unloading mechanism (such as a manipulator), and the positioning hole on the workpiece is aligned and sleeved on the positioning post 43 on the workbench 41. Subsequently, the corner pressing cylinder 42 presses down the workpiece to clamp the workpiece on the workbench 41. Then, driven by the sliding part of the lead screw linear slide rail 11, the workpiece is driven to the detection position (i.e., the front end of the first electric slide rail 1). When reaching the detection position, the light-shielding baffle 14 blocks the groove part of the photoelectric induction groove 13 at the front end of the first electric slide rail 1, and the lead screw linear slide rail 11 stops moving.

[0043] Next, the thread detection mechanism 7 is driven by the second electric slide rail 2 and the multi-axis robotic arm 5 to move above the thread hole to be detected on the workpiece. Then, the thread gauge detector 72 equipped with the go-gauge detection head 73 is activated, and the through-shaft motor 721 drives the go-gauge detection head 73 to rotate. During the rotation, the spline shaft 7221 moves downward together with the go-gauge detection head 73 that is in thread fit. At this time, the limit retaining ring 725 on the spline shaft 7221 presses down the compression spring 726 below it. After the detection is completed, the go-gauge detection head 73 rotates in the reverse direction and withdraws from the thread hole, and the compression spring 726 below the limit retaining ring 725 elastically resets and pushes up the limit retaining ring 725, so as to reset the spline shaft 7221. During the reset process, the compression spring 726 above the limit retaining ring 725 plays a buffering effect.

[0044] Subsequently, the first motor 6 drives the mounting plate 71 to rotate, so that the thread gauge detector 72 equipped with the no-go-gauge detection head 74 is aligned with the same thread hole. The through-shaft motor 721 drives the no-go-gauge detection head 74 to rotate. If the no-go-gauge detection head 74 cannot be screwed into the same thread hole, the size of the thread hole is detected as qualified. During the detection process, the attitude adjustment mechanism 3 can adjust the position of the workpiece on the clamping mechanism 4 to make the workpiece swing at multiple angles, further adapting to the detection of thread holes at different positions by the thread detection mechanism 7.

[0045] After the workpiece is inspected, the clamping mechanism 4 returns to the initial position driven by the sliding part of the first electric slide rail 1. The light-shielding baffle 14 slides to block the groove part of the photoelectric induction groove 13 at the rear end of the first electric slide rail 1, and the external loading and unloading mechanism takes away the inspected workpiece, thus realizing automatic detection.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A thread detection device, comprising a first electric slide rail (1) extending forward and backward and a second electric slide rail (2) extending upward and downward, wherein the second electric slide rail (2) is installed on the front side of the first electric slide rail (1), characterized in that: A posture adjustment mechanism (3) is fixedly provided on the sliding part of the first electric slide rail (1), and a clamping mechanism (4) for clamping a workpiece is movably connected to the posture adjustment mechanism (3); a multi-axis mechanical arm (5) is installed on the sliding part of the second electric slide rail (2), and a first motor (6) is fixedly provided on the execution part of the multi-axis mechanical arm (5); and a thread detection mechanism (7) cooperating with the clamping mechanism (4) is fixedly connected to the output shaft of the first motor (6); The thread detection mechanism (7) comprises a mounting plate (71), the front side of the mounting plate (71) being fixedly connected to the output shaft of the first motor (6), and the rear side of the mounting plate (71) being mounted with at least two groups of thread gauge detectors (72), the detection ends of the two groups of thread gauge detectors (72) being arranged in opposite directions, and the detection end of one group of thread gauge detectors (72) being detachably connected to a through gauge detection head (73), and the detection end of the other group of thread gauge detectors (72) being detachably connected to a stop gauge detection head (74).

2. The thread detection device according to claim 1, characterized in that: The tooth gauge detector (72) comprises a through-shaft motor (721), a ball spline shaft assembly, a coupling (723), and a floating reamer head (724) for connecting to a through gauge detection head (73) or a stop gauge detection head (74); The ball spline shaft assembly comprises a spline shaft (7221) and a ball spline nut (7222) sleeved on the spline shaft (7221); the spline shaft (7221) and the ball spline nut (7222) are inserted through the through-shaft cavity of the through-shaft motor (721), and the ball spline nut (7222) is connected to a driving portion of the through-shaft motor (721); The spline shaft (7221) is sleeved with a limit ring (725), two compression springs (726) and a spring cover (727); the spring cover (727) is fixedly covered on the upper end of the through-shaft cavity; the two compression springs (726) are axially limited between the ball spline nut (7222) and the spring cover (727); the limit ring (725) is fixed on the spline shaft (7221) and is located between the two compression springs (726); and the limit ring (725) is limitedly matched with the compression springs (726) on both sides; One end of the coupling (723) is connected to the lower end of the spline shaft (7221), and the other end of the coupling (723) is connected to the floating reamer head (724).

3. The thread detection device according to claim 2, characterized in that: The posture adjustment mechanism (3) comprises a fixed frame (31) and a swing frame (32), wherein the fixed frame (31) is fixedly mounted on a sliding portion of the first electric slide rail (1), and the swing frame (32) is rotatably connected between left and right side walls of the fixed frame (31), and a second motor (33) is mounted on an outer side wall of the fixed frame (31), an output shaft of the second motor (33) passes through the side wall of the fixed frame (31) and is connected to the swing frame (32), and the output shaft of the second motor (33) extends leftward and rightward; The clamping mechanism (4) is rotatably connected to the top side of the swing frame (32), and a third motor (34) is installed at the bottom of the swing frame (32) for direct or indirect transmission with the clamping mechanism (4), and an output shaft of the third motor (34) extends up and down.

4. The thread detection device according to claim 3, characterized in that: A first synchronous wheel (35) is sleeved on the output shaft of the third motor (34); the bottom of the clamping mechanism (4) passes through the top side of the swing frame (32); and a second synchronous wheel (36) is sleeved on the bottom of the clamping mechanism (4); a synchronous belt (37) is connected between the first synchronous wheel (35) and the second synchronous wheel (36).

5. The thread detection device according to claim 1, characterized in that: The first electric slide rail (1) comprises a lead screw linear slide rail (11) and a guide rail (12) which are spaced apart on the left and right sides; one end of the posture adjustment mechanism (3) is fixedly connected to the sliding portion of the lead screw linear slide rail (11), and the other end thereof is slidably connected to the guide rail (12).

6. The thread detection device according to claim 5, characterized in that: Both front and rear ends of the first electric slide rail (1) are provided with photoelectric sensing grooves (13), the photoelectric sensing grooves (13) being used to sense the travel state of the sliding portion of the first electric slide rail (1), and a light shielding baffle (14) cooperating with the photoelectric sensing grooves (13) is fixedly provided on the bottom side of the sliding portion of the first electric slide rail (1).

7. The thread detection device according to claim 1, characterized in that: The clamping mechanism (4) comprises a workbench (41) and a plurality of angular downward-pressing cylinders (42); the bottom of the workbench (41) is rotatably connected to the posture adjustment mechanism (3); a plurality of positioning columns (43) are arranged on the top side of the workbench (41); the plurality of positioning columns (43) correspond one-to-one to positioning holes of the external workpiece; The corner pressing cylinder (42) is installed on the top side of the workbench (41), and the rocker arm of the corner pressing cylinder (42) is tightened downward to clamp the workpiece on the workbench (41).

8. The thread detection device according to any one of claims 1 to 7, characterized in that: The tooth gauge detectors (72) are provided in four groups in total, and the four groups of tooth gauge detectors (72) are arranged in pairs on the left and right sides of the mounting plate; in each pair, the detection ends of the two groups of tooth gauge detectors (72) are arranged in opposite directions, and the detection end of one group is detachably connected to a through gauge detection head (73), and the detection end of the other group is detachably connected to a stop gauge detection head (74).

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