Device and method for detecting inner diameter of bottle body with small opening and large inner cavity

Abstract

The invention belongs to the technical field of rotary body inner diameter detection, and particularly relates to a device and a method for detecting the inner diameter of a bottle body with a small opening and a large inner cavity. A main shaft is rotationally mounted in a main shaft box, and one end of the main shaft is connected with a main shaft driving motor fixed on a lathe bed through a main shaft transmission mechanism; the three-jaw pneumatic chuck is installed at the other end of the main shaft, the closed end of the tested piece is clamped by the three-jaw pneumatic chuck, and the main shaft driving motor drives the three-jaw pneumatic chuck and the tested piece to rotate; a detection driving servo motor is fixed on the lathe bed, the measuring device is connected with the detection driving servo motor through a detection transmission mechanism, and the detection driving servo motor drives the measuring device to extend into the lathe bed from the open end of a measured piece. The method is good in detection accuracy, low in cost, high in speed, convenient to operate and high in flexibility, has a great effect on improving the quality of the small-opening large-inner-cavity body, and is greatly helpful for improving the product safety and reducing the labor intensity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of the inner diameter detection of a rotary body, in particular to a detection device and method for the inner diameter of a small-opening large-cavity bottle. BACKGROUND

[0002] At present, for the detection of the inner wall radius of a bottle with a caliber of more than 25mm and less than 30mm and a length of more than 800mm, the volumetric measurement method is mostly used, and it is difficult to obtain a direct measurement result; thus, the quality control is not intuitive enough, and it is easy to misjudge, and it has no effect on the inconsistent wall thickness. SUMMARY

[0003] In view of the above problems existing in the detection of the inner diameter of a small-opening large-cavity bottle, the purpose of the present application is to provide a detection device and method for the inner diameter of a small-opening large-cavity bottle.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] The detection device of the present application comprises a bed, a main shaft box, a three-jaw pneumatic chuck and a measuring device, the main shaft box is installed on the bed, the main shaft box is internally rotatably installed with a main shaft, one end of the main shaft is connected with a main shaft driving motor fixed on the bed through a main shaft transmission mechanism, the three-jaw pneumatic chuck is installed on the other end of the main shaft, the closed end of the measured piece is clamped by the three-jaw pneumatic chuck, and the main shaft driving motor drives the three-jaw pneumatic chuck and the measured piece to rotate; a detection driving servo motor is fixed on the bed, the measuring device is connected with the detection driving servo motor through a detection transmission mechanism, and the detection driving servo motor drives the measuring device to extend from the opening end of the measured piece; the measuring device comprises a detection base, an inner diameter detection rod, an electric cylinder, a detection box, a three-jaw chuck, a sliding sleeve, a pull rod key, a connecting rod, a sensor fixing rod and an inner diameter detection sensor, the detection base is connected with the detection transmission mechanism, a lifting servo motor is installed on the detection base, the detection box is connected with the output end of the lifting servo motor, the electric cylinder and the three-jaw chuck are respectively installed on the detection box, one end of the inner diameter detection rod is clamped through the three-jaw chuck, one end of the sensor fixing rod is hinged with the other end of the inner diameter detection rod, and the inner diameter detection sensor is installed on the other end of the sensor fixing rod; a sliding sleeve capable of sliding relative to the outer end of the inner diameter detection rod is sleeved, a pull rod key is slidingly installed between the two ends of the inner diameter detection rod, one end of the sliding sleeve is connected with the output end of the electric cylinder, the other end of the sliding sleeve is connected with one end of the pull rod key, and the other end of the pull rod key is hinged with the sensor fixing rod.

[0006] The auxiliary support device comprises an auxiliary support bracket and a self-centering center frame, an auxiliary support servo motor is fixed on the bed body, an output end of the auxiliary support servo motor is connected with an auxiliary support lead screw in an auxiliary support lead screw pair, the auxiliary support lead screw is rotatably installed on the bed body, the auxiliary support bracket is fixedly connected with an auxiliary support nut in the auxiliary support lead screw pair, and the self-centering center frame is installed on the auxiliary support bracket.

[0007] The output end of the electric cylinder is connected with an adapter disc, one end of the sliding sleeve is connected with the adapter disc, and a displacement sensor B for monitoring the moving distance of the adapter disc is installed on the detection box.

[0008] The measuring device further comprises an outer diameter detection rod and an outer diameter detection sensor, one end of the outer diameter detection rod is fixedly connected to the top of the detection box, and the outer diameter detection sensor is installed on the other end of the outer diameter detection rod; the outer diameter detection rod is parallel to the inner diameter detection rod.

[0009] The sliding sleeve is movably arranged in the three-jaw chuck, a slip ring A is inserted into the other end of the sliding sleeve, the other end of the sliding sleeve, the slip ring A and one end of the pull rod key are fixedly connected together, the other end of the pull rod key is fixedly connected with a slip ring B, the inner diameter detection rod passes through the slip ring A and the slip ring B respectively, and one end of the connecting rod is hingedly connected with the slip ring B; the sliding sleeve contains a fixing sleeve, one end of the inner diameter detection rod is inserted into the fixing sleeve and is fixedly connected with the fixing sleeve through an integrated expansion sleeve; a strip-shaped hole corresponding to the three clamping jaws of the three-jaw chuck is formed in the sliding sleeve in the axial direction, each clamping jaw is inserted into and clamped on the outer surface of the fixing sleeve through the corresponding strip-shaped hole, and each strip-shaped hole provides space for the axial sliding of the sliding sleeve.

[0010] The detection base is fixedly connected with a guide rail B in the lifting direction of the detection box, the detection box is slidably connected with the guide rail B, and the detection base is provided with a displacement sensor A for monitoring the moving distance of the detection box.

[0011] The detection transmission mechanism comprises a detection lead screw pair and a detection slide saddle, a detection lead screw in the detection lead screw pair is rotatably installed on the bed body and connected with the output end of the detection drive servo motor, the detection slide saddle is fixedly connected with a detection nut in the detection lead screw pair, and the detection base in the measuring device is fixed on the detection slide saddle.

[0012] The main shaft transmission mechanism is a synchronous belt reduction mechanism, the output shaft of the main shaft drive motor and the main shaft are respectively connected with synchronous pulleys, and the two synchronous pulleys are connected through a synchronous belt; the main shaft box is divided into an upper main shaft box and a lower main shaft box, the lower main shaft box is fixed on the bed body, the upper main shaft box is fixedly connected with the lower main shaft box through bolts, and the main shaft is rotatably connected with the main shaft box through a main shaft bearing.

[0013] The present application is directed to a method for detecting the inner diameter of a small opening and large cavity bottle, and the specific steps are as follows:

[0014] Preparation before detection:

[0015] The measured part is clamped by a three-jaw pneumatic chuck, and one end of the inner diameter detection rod is clamped by a three-jaw chuck;

[0016] The lifting servo motor drives the detection box to adjust up and down until the inner diameter detection rod can enter the small opening of the measured part without interference, and the lifting servo motor stops working;

[0017] The detection drive servo motor drives the detection slide to move through the detection screw pair, and then drives the inner diameter detection rod to extend into the cavity of the measured part until the inner diameter detection sensor contacts the bottom of the measured part, and the detection drive servo motor stops working;

[0018] The electric cylinder works, pulls the pull rod key backward through the sliding sleeve, and then pulls the connecting rod backward, and pulls the inner diameter detection sensor fixed at the other end of the sensor fixed rod to a set angle through the connecting rod, and the electric cylinder stops working;

[0019] The lifting servo motor is started again to drive the detection box to adjust up and down, ensuring that the inner diameter detection rod does not contact the small opening of the measured part, and adjusting the length of the inner diameter detection sensor contact steel ball retracted after contacting the inner wall of the measured part;

[0020] Start detection:

[0021] The main shaft drive motor drives the main shaft to rotate through the main shaft transmission mechanism, the three-jaw pneumatic chuck clamps the measured part to rotate, and the inner diameter detection sensor generates a value and is recorded;

[0022] Then, the detection drive servo motor drives the inner diameter detection rod to move horizontally through the detection transmission mechanism, while reading the displacement value and recording;

[0023] After the detection is completed, the electric cylinder is started again to drive the sliding sleeve and the pull rod key to extend forward, and the inner diameter detection sensor is driven to the horizontal position again through the connecting rod;

[0024] Finally, the detection drive servo motor drives the inner diameter detection rod to move out of the cavity of the measured part through the detection transmission mechanism.

[0025] Wherein: when batch detection is performed, it is completed by comparison method, that is, a standard measured part is detected before formal detection, and the standard value of the standard measured part is compared with the value of the batch detected measured part during formal detection to determine whether it is qualified or not.

[0026] The advantages and positive effects of the present application are:

[0027] 1. The present application has good detection accuracy, low cost, fast speed, convenient operation, strong flexibility, great effect on improving the quality of small opening and large inner cavity, improving product safety, and greatly helping to reduce labor intensity.

[0028] 2. The present application can detect the outer wall radius of the measured part through the outer diameter detection rod, lift the small opening of the measured part at a right angle by inserting the inner diameter detection rod, and detect the inner wall radius by using the inner diameter detection sensor in a contact manner, thereby completing the detection of the measured part. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is one of the schematic diagrams of the three-dimensional structure of the detection device of the present application;

[0030] Figure 2 It is the second schematic diagram of the three-dimensional structure of the detection device of the present application;

[0031] Figure 3 It is the front view of the detection device of the present application;

[0032] Figure 4 It is the schematic diagram of the three-dimensional structure of the measuring device in the detection device of the present application;

[0033] Figure 5 It is the front view of the measuring device in the detection device of the present application;

[0034] Figure 6 It is the front view of the partial structure of the measuring device in the detection device of the present application;

[0035] Figure 7 It is the schematic diagram of the structure of the measuring device in the detection device of the present application for measuring the bottom of the bottle;

[0036] Figure 8 It is the schematic diagram of the structure of the measuring device in the detection device of the present application for measuring the large inner cavity bottle body after replacing the long inner diameter detection rod;

[0037] Wherein: 1 is the bed body, 101 is the base, 102 is the detection driving servo motor, 103 is the auxiliary support servo motor, 104 is the auxiliary support screw pair, 105 is the detection screw pair, 106 is the auxiliary support slide saddle, 107 is the detection slide saddle, and 108 is the guide rail A;

[0038] 2 is the main shaft box, 201 is the main shaft driving motor, 202 is the synchronous belt reduction mechanism, 203 is the lower main shaft box, 204 is the main shaft bearing, 205 is the main shaft, 206 is the upper main shaft box, and 207 is the chuck chair;

[0039] 3 is the three-jaw pneumatic chuck, and 4 is the measured part;

[0040] 5 is an auxiliary support device, 501 is an auxiliary support bracket, and 502 is a self-centering central frame;

[0041] 6 is the measuring device, 601 is the detection base, 602 is the guide rail B, 603 is the outer diameter detection rod, 604 is the outer diameter detection sensor, 605 is the inner diameter detection rod, 606 is the lifting servo motor, 607 is the displacement sensor A, 608 is the dust cover, 609 is the electric cylinder, 610 is the detection box, 611 is the chuck seat, 612 is the adapter plate, 613 is the displacement sensor B, 614 is the three-jaw chuck, 615 is the gripper, 616 is the sliding sleeve, 617 is the slip ring A, 618 is the pull rod key, 619 is the slip ring B, 620 is the connecting rod, 621 is the inner diameter detection sensor, 622 is the sensor fixing rod, 623 is the strip hole, 624 is the integrated expansion sleeve, and 625 is the fixing sleeve. Detailed Implementation

[0042] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0043] like Figures 1-6 As shown, the detection device of the present invention includes a bed 1, a spindle box 2, a three-jaw pneumatic chuck 3, and a measuring device 6. The spindle box 2 is mounted on the bed 1, and a spindle 205 is rotatably mounted inside the spindle box 2. One end of the spindle 205 is connected to a spindle drive motor 201 fixed on the bed 1 through a spindle transmission mechanism. The three-jaw pneumatic chuck 3 is mounted on the other end of the spindle 205. The closed end of the workpiece 4 to be measured is clamped by the three-jaw pneumatic chuck 3. The spindle drive motor 201 drives the three-jaw pneumatic chuck 3 and the workpiece 4 to rotate. A detection drive servo motor 102 is fixed on the bed 1. The measuring device 6 is connected to the detection drive servo motor 102 through a detection transmission mechanism. The detection drive servo motor 102 drives the measuring device 6 to extend into the open end of the workpiece 4.

[0044] The horizontal assembly characteristics of the bed body 1 directly affect the rigidity of the whole machine, especially the long-term accuracy of detection; the bed body 1 of the embodiment comprises a base 101, the top of the base 101 is provided with a guide rail A108 along the moving direction of the measuring device 6, and a main shaft driving motor 201 and a detection driving servo motor 102 are fixed on the base 101. The detection device of the embodiment further comprises an auxiliary support device 5 for cooperating with the detection of the measuring device 6 to ensure the stability and accuracy of the measured member 4 during detection; the auxiliary support device 5 comprises an auxiliary support bracket 501 and a self-centering center frame 502, an auxiliary support servo motor 103 is fixed on the base 101, the output end of the auxiliary support servo motor 103 is connected with an auxiliary support screw in an auxiliary support screw pair 104, the auxiliary support screw is rotatably installed on the base 101, the auxiliary support bracket 501 is fixed with an auxiliary support nut in the auxiliary support screw pair 104 and is in sliding connection with the guide rail A108, and the self-centering center frame 502 is installed on the auxiliary support bracket 501. The open end of the measured member 4 is clamped and in rolling contact through the self-centering center frame 502, and the measured member 4 can be automatically centered and assisted to rotate through the self-centering center frame 502 when rotating.

[0045] The detection driving mechanism of the embodiment comprises a detection screw pair 105 and a detection slide saddle 107, a detection screw in the detection screw pair 105 is rotatably installed on the base 101 and is connected with the output end of the detection driving servo motor 102, the detection slide saddle 107 is fixed with a detection nut in the detection screw pair 105 and is in sliding connection with the guide rail A108, and the measuring device is fixed on the detection slide saddle 107.

[0046] The main shaft driving mechanism of the embodiment is a synchronous belt reduction mechanism 202, and synchronous pulleys are connected on the output shaft of the main shaft driving motor 201 and the main shaft 205, and the two synchronous pulleys are connected through a synchronous belt; in order to facilitate casting production, the main shaft box 2 of the embodiment is divided into an upper main shaft box 206 and a lower main shaft box 203, the lower main shaft box 203 is fixed on the base 101, and the upper main shaft box 206 is fixed with the lower main shaft box 203 through bolts; the main shaft 205 is rotatably connected with the main shaft box 2 through a main shaft bearing 204, both ends of the main shaft 205 are located outside the main shaft box 2, one end of the main shaft 205 is used for being connected with the synchronous belt reduction mechanism 202, and the other end of the main shaft 205 is connected with a chuck seat 207 for mounting a three-jaw pneumatic chuck 3, and the three-jaw pneumatic chuck 3 is used for automatically clamping the outer wall of the measured member 4 of different specifications. The main shaft box 2 transmits the rotary motion of the main shaft driving motor 201 to the main shaft 205 through the synchronous belt reduction mechanism 202, and stepless speed regulation is realized, so as to adapt to the measurement requirements of the measured member 4 of different specifications.

[0047] The measuring device 6 of the embodiment comprises a detection base 601, an outer diameter detection rod 603, an outer diameter sensor 604, an inner diameter detection rod 605, an electric cylinder 609, a detection box 610, a three-jaw chuck 614, a sliding sleeve 616, a pull rod key 608, a connecting rod 620, a sensor fixing rod 622 and an inner diameter detection sensor 621. The detection base 601 is mounted on the detection sliding saddle 107, and a lifting servo motor 606 is fixed on the detection base 601. The detection box 610 is connected with the output end of the lifting servo motor 606 and is driven to lift by the lifting servo motor 606. The detection base 601 is fixedly connected with a guide rail B 602 along the lifting direction of the detection box 610, and the detection box 610 is slidingly connected with the guide rail B 602. On the detection base 601 at one side of the lifting servo motor 606, a displacement sensor A 607 for monitoring the moving distance of the detection box 610 is installed. The electric cylinder 609, the outer diameter detection rod 603 and the three-jaw chuck 614 are respectively installed on the detection box 610. One end of the outer diameter detection rod 603 is fixed on the top of the detection box 610, and the other end of the outer diameter detection rod 603 is provided with the outer diameter detection sensor 604 for detecting the outer diameter of the measured member. The outer diameter detection rod 603 is parallel to the inner diameter detection rod 605. The inner diameter detection rod 605 is a hollow rod. One end of the inner diameter detection rod 605 is clamped by the three-jaw chuck 614, one end of the sensor fixing rod 622 is hingedly connected with the other end of the inner diameter detection rod 605, and the inner diameter detection sensor 621 is installed on the other end of the sensor fixing rod 622. The outer part of one end of the inner diameter detection rod 605 is provided with the sliding sleeve 616 which can slide relatively, and the pull rod key 618 is slidingly installed between the two ends of the inner diameter detection rod 605. The output end of the electric cylinder 609 is connected with an adapter disc 612, one end of the sliding sleeve 616 is connected with the adapter disc 612, the other end of the sliding sleeve 616 is connected with one end of the pull rod key 618, and the other end of the pull rod key 618 is hingedly connected with the sensor fixing rod 622. A displacement sensor B 613 for monitoring the moving distance of the adapter disc 612 is installed on the detection box 610.

[0048] The sliding sleeve 616 of the embodiment is movably arranged in the three-jaw chuck 614. A sliding ring A 617 is inserted into the other end of the sliding sleeve 616. The other end of the sliding sleeve 616, the sliding ring A 617 and one end of the pull rod key 618 are fixed together by screws. The other end of the pull rod key 618 is fixed with a sliding ring B 619 by a screw. The inner diameter detection rod 605 passes through the sliding ring A 617 and the sliding ring B 619. One end of the connecting rod 620 is hingedly connected with the sliding ring B 619. The sliding sleeve 616 is provided with a fixed sleeve 625. One end of the inner diameter detection rod 605 is inserted into the fixed sleeve 625 and is fixed with the fixed sleeve 625 by an integrated expansion sleeve 624. Axial strip-shaped holes 623 corresponding to the three clamping jaws 615 of the three-jaw chuck 614 are formed in the sliding sleeve 616. Each clamping jaw 615 extends into and clamps the outer surface of the fixed sleeve 625 through the corresponding strip-shaped hole 623. Each strip-shaped hole 623 provides space for the axial sliding of the sliding sleeve 616.

[0049] As shown in Figure 7 , it is the state diagram of the bottom of the measuring bottle of the detection device of the application. As shown in Figure 8 , only the clamping jaw 615 needs to be loosened, and the slide sleeve 616, the slide ring A 617, the pull rod key 618, the slide ring B 619, the connecting rod 620, the inner diameter detection sensor 621, the sensor fixing rod 622, the integrated expansion sleeve 624 and the fixing sleeve 625 can be taken out, and the quick replacement is completed.

[0050] The self-centering center frame 502 of the application is a commercially available product, purchased from the German SMW-Autoblok company, and the model is SR6. The displacement sensor A 607 and the displacement sensor B 613 of the application are both commercially available products, purchased from the miniature pull rod linear displacement sensor produced by the Xi'an Xinmin Electronic Technology Co., Ltd., and the model is WYW1. The inner diameter detection sensor 321 of the application is a commercially available product, purchased from the British Tufa Solartron Metrology Company, and the model is OPTIMUM. The three-jaw pneumatic chuck 3 and the three-jaw chuck 614 of the application are both prior art, and will not be described here. Each sensor of the application is connected to a control device, and the control device of the application is also prior art, and will not be described here.

[0051] The detection method for the inner diameter of the small-opening large-cavity bottle body of the application is as follows:

[0052] Preparation before detection:

[0053] The measured part 4 is clamped by the three-jaw pneumatic chuck 3, and one end of the inner diameter detection rod 605 is clamped by the three-jaw chuck 614;

[0054] The lifting servo motor 606 drives the detection box 610 to adjust up and down along the guide rail B 602 until the inner diameter detection rod 605 can enter the small opening of the measured part 4 without interference, and the lifting servo motor 606 stops working;

[0055] The detection driving servo motor 102 drives the detection slide saddle 107 to move along the guide rail A 108 through the detection screw pair 105, and then drives the inner diameter detection rod 605 to extend into the cavity of the measured part 4 until the inner diameter detection sensor 621 contacts the bottom of the measured part 4 (at this time, the inner diameter detection rod 605 and the axial center line of the measured part 4 may not be collinear), and the detection driving servo motor 102 stops working;

[0056] The electric cylinder 609 works, pulls the pull rod key 618 backward through the sliding sleeve 616, further pulls the connecting rod 620 backward, pulls up the inner diameter detection sensor 621 fixed at the other end of the sensor fixing rod 622 to a set angle (the sensor fixing rod 622 of the embodiment is pulled up from the horizontal state to be perpendicular to the inner diameter detection rod 605) through the connecting rod 620, during which the cable of the inner diameter detection sensor 621 is protected in the cavity of the inner diameter detection rod 605, and the electric cylinder 609 stops working; during the process of pulling up the sensor fixing rod 622, the displacement sensor B 613 detects the count, which is converted into the angle of lifting the inner diameter detection sensor 621;

[0057] The lifting servo motor 606 is started again to drive the detection box 610 to adjust up and down, so that the inner diameter detection rod 605 is adjusted to ensure that the contact steel ball of the inner diameter detection sensor 621 is in contact with the inner wall of the measured part 4 after being retracted (the inner diameter detection sensor 621 counts) without being in contact with the small opening of the measured part 4;

[0058] Start detection:

[0059] The main shaft driving motor 201 drives the main shaft 205 to rotate through the synchronous belt reduction mechanism 202, the main shaft 205 drives the three-jaw pneumatic chuck 3 to rotate to clamp the measured part 4, and the inner diameter detection sensor 621 generates a value and is recorded;

[0060] Then, the detection driving servo motor 102 drives the inner diameter detection rod 605 installed on the detection sliding saddle 107 to move horizontally through the detection screw pair 105, and reads the displacement value and records it at the same time;

[0061] After the detection is completed, the electric cylinder 609 is started again to drive the sliding sleeve 616 and the pull rod key 618 to stretch forward, and the inner diameter detection sensor 621 is driven by the connecting rod 620 to turn to the horizontal position again;

[0062] Finally, the detection driving servo motor 102 drives the inner diameter detection rod 605 installed on the detection sliding saddle 107 to move out of the cavity of the measured part 4 through the detection screw pair 105.

[0063] When batch detection is performed, it is completed by comparison method, that is, a standard measured part 4 is detected before formal detection, and the standard value of the standard measured part 4 is compared with the value of the batch detected measured part 4 during formal detection to determine whether it is qualified or not.

[0064] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A detection device for the inner diameter of a bottle with a small opening and a large inner cavity, characterized in that: The device includes a bed (1), a spindle box (2), a three-jaw pneumatic chuck (3), and a measuring device (6). The spindle box (2) is mounted on the bed (1), and a spindle (205) is rotatably mounted inside the spindle box (2). One end of the spindle (205) is connected to a spindle drive motor (201) fixed on the bed (1) through a spindle transmission mechanism. The three-jaw pneumatic chuck (3) is mounted on the other end of the spindle (205). The closed end of the workpiece (4) being measured is clamped by the three-jaw pneumatic chuck (3). The spindle drive motor (201) drives the three-jaw pneumatic chuck. The disc (3) and the workpiece (4) rotate; a detection drive servo motor (102) is fixed on the bed (1), and the measuring device (6) is connected to the detection drive servo motor (102) through a detection transmission mechanism. The detection drive servo motor (102) drives the measuring device (6) to extend into the open end of the workpiece (4); the measuring device (6) includes a detection base (601), an inner diameter detection rod (605), an electric cylinder (609), a detection box (610), a three-jaw chuck (614), a sliding sleeve (616), a pull rod key (608), and a connecting rod (62). 0), Sensor fixing rod (622) and inner diameter detection sensor (621), the detection base (601) is connected to the detection transmission mechanism, the lifting servo motor (606) is installed on the detection base (601), the detection box (610) is connected to the output end of the lifting servo motor (606), the electric cylinder (609) and the three-jaw chuck (614) are respectively installed on the detection box (610), one end of the inner diameter detection rod (605) is clamped by the three-jaw chuck (614), one end of the sensor fixing rod (622) is connected to the inner diameter detection rod (621). The other end of the inner diameter detection sensor (621) is hinged, and the inner diameter detection sensor (621) is installed at the other end of the sensor fixing rod (622); a sliding sleeve (616) that can slide relative to the inner diameter detection rod (605) is sleeved on the outside of one end, and a pull rod key (618) is slidably installed between the two ends of the inner diameter detection rod (605). One end of the sliding sleeve (616) is connected to the output end of the electric cylinder (609), and the other end of the sliding sleeve (616) is connected to one end of the pull rod key (618). The other end of the pull rod key (618) is hinged to the sensor fixing rod (622).

2. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: It also includes an auxiliary support device (5), which includes an auxiliary support bracket (501) and a self-centering center frame (502). An auxiliary support servo motor (103) is fixed on the bed (1). The output end of the auxiliary support servo motor (103) is connected to the auxiliary support screw in the auxiliary support screw pair (104). The auxiliary support screw is rotatably mounted on the bed (1). The auxiliary support bracket (501) is fixedly connected to the auxiliary support nut in the auxiliary support screw pair (104). The self-centering center frame (502) is mounted on the auxiliary support bracket (501). The open end of the test piece (4) is clamped by the self-centering center frame (502) and makes rolling contact.

3. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: The output end of the electric cylinder (609) is connected to the adapter plate (612), one end of the sliding sleeve (616) is connected to the adapter plate (612), and the detection box (610) is equipped with a displacement sensor B (613) for monitoring the moving distance of the adapter plate (612).

4. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: The measuring device (6) further includes an outer diameter detection rod (603) and an outer diameter detection sensor (604). One end of the outer diameter detection rod (603) is fixed to the top of the detection box (610), and the outer diameter detection sensor (604) is installed at the other end of the outer diameter detection rod (603). The outer diameter detection rod (603) is parallel to the inner diameter detection rod (605).

5. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: The sliding sleeve (616) is movably disposed within the three-jaw chuck (614). A slip ring A (617) is inserted into the other end of the sliding sleeve (616). The other end of the sliding sleeve (616), slip ring A (617), and one end of the pull rod key (618) are fixedly connected together. A slip ring B (619) is fixedly connected to the other end of the pull rod key (618). The inner diameter detection rod (605) passes through slip ring A (617) and slip ring B (619) respectively. One end of the connecting rod (620) is hinged to slip ring B (619). The sliding sleeve (616) contains… A fixed sleeve (625) is provided, and one end of the inner diameter detection rod (605) is inserted into the fixed sleeve (625) and fixed to the fixed sleeve (625) by an integral expansion sleeve (624); the sliding sleeve (616) has a strip hole (623) along the axial direction corresponding to the three jaws (615) of the three-jaw chuck (614), and each jaw (615) extends into the corresponding strip hole (623) and clamps on the outer surface of the fixed sleeve (625), and each strip hole (623) provides space for the axial sliding of the sliding sleeve (616).

6. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: A guide rail B (602) is fixedly connected to the detection base (601) along the lifting direction of the detection box (610). The detection box (610) is slidably connected to the guide rail B (602). A displacement sensor A (607) for monitoring the moving distance of the detection box (610) is installed on the detection base (601).

7. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: The detection transmission mechanism includes a detection lead screw pair (105) and a detection slide saddle (107). The detection lead screw in the detection lead screw pair (105) is rotatably mounted on the bed (1) and connected to the output end of the detection drive servo motor (102). The detection slide saddle (107) is fixedly connected to the detection nut in the detection lead screw pair (105). The detection base (601) in the measuring device (6) is fixed on the detection slide saddle (107).

8. The detection device for the inner diameter of a bottle with a small opening and a large inner cavity according to claim 1, characterized in that: The main spindle transmission mechanism is a synchronous belt reduction mechanism (202). The output shaft of the main spindle drive motor (201) and the main spindle (205) are respectively connected to synchronous pulleys, and the two synchronous pulleys are connected by a synchronous belt. The main spindle box (2) is divided into an upper main spindle box (206) and a lower main spindle box (203). The lower main spindle box (203) is fixed on the bed (1). The upper main spindle box (206) is fixed to the lower main spindle box (203) by bolts. The main spindle (205) is rotatably connected to the main spindle box (2) through the main spindle bearing (204).

9. A method for detecting the inner diameter of a bottle with a small opening and a large inner cavity, characterized in that: The specific steps of using the detection device according to any one of claims 1 to 8 are as follows: Preparation before testing: The test piece (4) is clamped by a three-jaw pneumatic chuck (3), and one end of the inner diameter detection rod (605) is clamped by a three-jaw chuck (614); The lifting servo motor (606) drives the detection box (610) to adjust up and down until the inner diameter detection rod (605) can enter the small opening of the test piece (4) without interference, and then the lifting servo motor (606) stops working. The detection drive servo motor (102) drives the detection slide saddle (107) to move through the detection lead screw pair (105), thereby driving the inner diameter detection rod (605) to extend into the cavity of the test piece (4) until the inner diameter detection sensor (621) contacts the bottom of the test piece (4), and the detection drive servo motor (102) stops working. When the electric cylinder (609) is working, the sliding sleeve (616) pulls the lever key (618) backward, which in turn pulls the connecting rod (620) backward. The connecting rod (620) then pulls up the inner diameter detection sensor (621) fixed to the other end of the sensor fixing rod (622) to a set angle, and the electric cylinder (609) stops working. The lifting servo motor (606) is restarted again, driving the detection box (610) to adjust up and down, ensuring that the inner diameter detection rod (605) does not contact the small opening of the test piece (4), and adjusting the length of the contact steel ball of the inner diameter detection sensor (621) after contacting the inner wall of the test piece (4). Start testing: The main spindle drive motor (201) drives the main spindle (205) to rotate through the main spindle transmission mechanism. The main spindle (205) drives the three-jaw pneumatic chuck (3) to clamp the workpiece (4) to rotate. The inner diameter detection sensor (621) generates a value and records it. Then, the detection drive servo motor (102) drives the inner diameter detection rod (605) to move horizontally through the detection transmission mechanism, while reading and recording the displacement value; After the test is completed, the electric cylinder (609) is restarted, driving the sliding sleeve (616) and the pull rod key (618) to extend forward, and driving the inner diameter detection sensor (621) to rotate back to the horizontal position through the connecting rod (620); Finally, the detection drive servo motor (102) drives the inner diameter detection rod (605) out of the cavity of the test piece (4) through the detection transmission mechanism.

10. The detection method according to claim 9, characterized in that: When performing batch testing, the comparison method is used. That is, before the formal testing, a standard test piece (4) is tested. During the formal testing, the standard value of the standard test piece (4) is compared with the value of the test piece (4) in the batch testing to determine whether it is qualified or not.

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