A valve stem detection device

Abstract

The present invention belongs to the field of appearance detection, and specifically discloses a valve stem detection device, including a frame assembly, a dual-point appearance detection mechanism, a conveyor belt drive mechanism, and a locking conversion mechanism. The present invention proposes a device that can comprehensively judge the eligibility. When a product has excessive deviations in any of the above dimensions, an alarm will be triggered. Although the specific type of unqualified cannot be obtained, in actual production, it is only necessary to judge whether it meets the standards; in addition, in order to simplify the drive structure, the present invention can also switch the movement of the conveyor belt drive mechanism between the lateral mode and the rotation mode by alternating locking.

Description

Technical Field

[0001] The invention belongs to the technical field of appearance detection, and specifically refers to a valve stem detection device. Background Art

[0002] The fitting part of the valve stem has high precision requirements, so it needs to be tested after production. The middle fitting part of the valve stem not only has high requirements on the diameter size, but also requires that the whole should be approximately a standard cylinder, that is, the central axis cannot be bent, and there should be no obvious diameter changes.

[0003] In the first commonly used inspection step (weighing method), it is often only possible to determine whether the valve stem is too thick or too thin as a whole, but it is impossible to detect the dimensional deviation within the weight range. For dimensional deviations in multiple dimensions (including the straightness of the center axis, the roundness of the cross section, the overall cylindricity, etc.), the general inspection method requires inspection one by one. The overall steps are relatively cumbersome and not easy to apply in the industry. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention proposes a highly integrated detection device that can simultaneously detect the shape and size deviations of the valve stem fitting parts from multiple dimensions. This scheme does not adopt the traditional one-by-one detection method, but is more in line with actual production needs. It proposes a device that can comprehensively judge the qualification. When the product has excessive deviations in any of the above dimensions, an alarm will be triggered. Although the specific type of unqualified cannot be determined, in actual production, it is only necessary to judge whether it meets the standards; in addition, in order to simplify the drive structure, the present invention can also use alternating locking methods to enable the movement of the transmission belt drive mechanism to switch between the lateral movement mode and the rotation mode.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a valve stem detection device, including a frame assembly, a dual-point shape detection mechanism, a conveyor belt drive mechanism and a locking conversion mechanism, the frame assembly includes a fixed frame and a rigid guide rail, the fixed frame is provided with support rod parts at the top and bottom, and the rigid guide rail is fixedly connected to the support rod part.

[0006] On the one hand, the rigid guide rail can guide the overall conveying of the conveyor belt drive mechanism, and on the other hand, the position accuracy of the valve stem body can be ensured during detection through the cooperation between the rigid guide rail and the sliding block.

[0007] Furthermore, the dual-point shape detection mechanism is arranged in an array along the direction of the rigid guide rail, and the dual-point shape detection mechanism is symmetrically arranged on both sides of the rigid guide rail, wherein the symmetrically arranged dual-point shape detection mechanisms are grouped in pairs, and a total of no less than two groups are arranged; the transmission belt drive mechanism is slidably arranged on the rigid guide rail, and the locking conversion mechanism is arranged on the transmission belt drive mechanism.

[0008] Furthermore, the dual-point shape detection mechanism includes a detection support assembly, a cyclic lifting assembly and a detection alarm assembly, the detection support assembly is arranged on a fixed frame, the cyclic lifting assembly is rotatably arranged on the detection support assembly, the detection alarm assembly is rotatably arranged on the cyclic lifting assembly, and the detection alarm assembly is arranged in an array.

[0009] Preferably, the detection support assembly includes a bow-shaped bracket, a rotating shaft seat, a lifting drive rotating shaft and a lifting driven gear, the bow-shaped bracket is arranged on a fixed frame, the rotating shaft seat is arranged on the bow-shaped bracket, the lifting drive rotating shaft is rotatably arranged in the rotating shaft seat, and the lifting driven gear is engaged with the lifting drive rotating shaft.

[0010] As a further preferred embodiment of the present invention, the circulating lifting assembly includes a lifting guide wheel and a lifting guide rod. The lifting guide wheel is clamped on the lifting drive shaft, and an annular wave groove is provided inside the lifting guide wheel. The lifting guide rod is clamped and slidably provided in the bow-shaped bracket. The lifting guide rod can only slide axially but cannot rotate relative to the bow-shaped bracket. Arc-shaped end portions are provided at both ends of the lifting guide rod, and the arc-shaped end portions are in sliding contact with the annular wave groove.

[0011] When the transmission belt drive mechanism is locked and fixed, the self-rotation of the transmission belt drive mechanism can drive the lifting drive shaft to rotate. When the lifting drive shaft rotates, the lifting guide wheel can be used to control the small-amplitude longitudinal reciprocating lifting of the lifting guide rod, thereby expanding the detection area of ​​the arc side wall from a point to a line, and then cooperating with the self-rotation of the valve stem body to expand the detection range from a line to a surface, thereby providing feedback on whether the size of the valve stem body is within the qualified range.

[0012] As a further preferred embodiment of the present invention, the detection alarm component includes a disc terminal, an induction roller, a permanent magnet and an induction coil, the disc terminal is fixedly connected to the lifting guide rod, the disc terminal is provided with an annular positive pole and an annular negative pole, the induction roller is rotatably arranged on the lifting guide rod, the permanent magnet is symmetrically arranged on the induction roller, the induction coil is evenly distributed in an annular manner on the induction roller, the induction coil is provided with a coil positive pole and a coil negative pole, the coil positive pole is in contact and conduction with the annular positive pole, and the coil negative pole is in contact and conduction with the annular negative pole.

[0013] When the induction rollers on the same lifting guide rod are relatively stationary, no current will be generated. If some of the induction rollers rotate relative to other induction rollers, the induction coil will generate current. By determining whether the induced current is generated, it can be determined whether the external dimensions of the valve stem body are within the standard range.

[0014] Furthermore, the belt-type drive mechanism includes a valve stem clamping assembly, a rotating support assembly and a driving assembly. The rotating support assembly and the driving assembly are symmetrically provided at both ends of the valve stem clamping assembly. The rotating support assembly is slidably arranged in a rigid guide rail, and the driving assembly is arranged on the rotating support assembly.

[0015] Preferably, the valve stem clamping assembly includes a valve stem body, a limit slot and a three-jaw chuck, the limit slot is clamped at one end of the valve stem body, the three-jaw chuck is clamped at the other end of the valve stem body, and the induction roller is provided with an arcuate side wall. In one set of symmetrically arranged two-point shape detection mechanisms, the spacing of the arcuate side walls is smaller than the standard diameter of the valve stem body, and in another set of symmetrically arranged two-point shape detection mechanisms, the spacing of the arcuate side walls is larger than the standard diameter of the valve stem body.

[0016] The valve stem body can be fixed by the limit slot and the three-jaw chuck, and the central axis of the valve stem body can be ensured to coincide with the central axis of the limit slot and the three-jaw chuck.

[0017] As a further preferred embodiment of the present invention, the rotating support assembly includes a sliding block, a center bearing and a gear rotating shaft, the gear rotating shaft is arranged at both ends of the limit slot and the three-jaw chuck, the center bearing is engaged with the gear rotating shaft, the sliding block is engaged with the center bearing, and the sliding block is engaged and slidably arranged in the rigid guide rail.

[0018] As a further preferred embodiment of the present invention, the driving assembly includes a driving toothed belt, a main driving gear and a lifting driving gear, the driving toothed belt is slidably arranged on a rigid guide rail, the driving toothed belt is driven by an external driving device, the main driving gear is engaged with the gear rotating shaft, the main driving gear and the gear rotating shaft are fixedly connected, the lifting driving gear is arranged on the main driving gear, the main driving gear and the driving toothed belt are meshed for transmission, and the lifting driving gear and the lifting driven gear are meshed for transmission.

[0019] The drive belt and the main drive gear remain engaged. If the sliding block position is locked, the main drive gear will rotate under the drive of the drive belt. If the main drive gear is locked, the main drive gear will translate along with the drive belt. During the continuous movement of the drive belt, the displacement mode and the in-situ detection mode are switched by whether the main drive gear is locked.

[0020] Furthermore, the locking conversion mechanism includes a gear locking assembly and a transverse locking assembly, the gear locking assembly is arranged on the sliding block, and the transverse locking assembly is arranged on the gear locking assembly; the gear locking assembly includes a telescopic cylinder, a locking pin and a liquid dispensing head bracket, the telescopic cylinder is arranged on the sliding block, an end piston is arranged at the end of the telescopic cylinder, the locking pin is arranged on the end piston, the locking pin is provided with a locking tooth portion matching the main driving gear, and the liquid dispensing head bracket is arranged on the outside of the telescopic cylinder.

[0021] Preferably, the transverse locking assembly includes a three-way liquid distributor head, a spring mounting plate, a synchronous spring and a telescopic locking leg. The three-way liquid distributor head is arranged on a liquid distributor head bracket. The three-way liquid distributor head consists of a main pipe part and a branch pipe part. The spring mounting plate is fixedly connected to the middle position of the branch pipe part. The telescopic locking leg is snap-fitted and slidably arranged in the branch pipe part. The synchronous spring is arranged between the spring mounting plate and the telescopic locking leg.

[0022] The mode switching can be controlled by extending and retracting the telescopic cylinder, and when the main driving gear is locked, the rigid guide rail and the telescopic cylinder are unlocked; when the rigid guide rail and the telescopic cylinder are locked by the telescopic locking leg, the main driving gear is also unlocked at the same time.

[0023] The beneficial effects achieved by the present invention using the above structure are as follows:

[0024] (1) The rigid guide rail can guide the overall conveying of the belt drive mechanism on the one hand, and can also ensure the position accuracy of the valve stem body through the cooperation between the rigid guide rail and the sliding block during detection on the other hand.

[0025] (2) When the transmission belt drive mechanism is locked and fixed, the self-rotation of the transmission belt drive mechanism can drive the lifting drive shaft to rotate. When the lifting drive shaft rotates, the lifting guide wheel can control the small longitudinal reciprocating lifting of the lifting guide rod, so that the detection area of ​​the arc side wall is expanded from a point to a line, and then the self-rotation of the valve stem body is combined with the detection range to expand from a line to a surface, so as to provide feedback on whether the size of the valve stem body is within the qualified range.

[0026] (3) When the induction rollers on the same lifting guide rod are relatively stationary, no current will be generated. If some of the induction rollers rotate relative to other induction rollers, the induction coil will generate current. By determining whether the induced current is generated, it can be determined whether the external dimensions of the valve stem body are within the standard range.

[0027] (4) The valve stem body can be fixed by the limit slot and the three-jaw chuck, and the central axis of the valve stem body can be ensured to coincide with the central axis of the limit slot and the three-jaw chuck.

[0028] (5) The drive belt and the main drive gear remain engaged. If the sliding block is locked, the main drive gear will rotate under the drive of the drive belt. If the main drive gear is locked, the main drive gear will translate along with the drive belt. During the continuous movement of the drive belt, the displacement mode and the in-situ detection mode are switched by whether the main drive gear is locked.

[0029] (6) The mode switching can be controlled by the extension and retraction of the telescopic cylinder, and when the main drive gear is locked, the rigid guide rail and the telescopic cylinder are unlocked; when the rigid guide rail and the telescopic cylinder are locked by the telescopic locking leg, the main drive gear is also unlocked at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of a valve stem detection device proposed by the present invention;

[0031] Figure 2 This is a front view of a valve stem detection device proposed by the present invention;

[0032] Figure 3 This is a left side view of a valve stem detection device proposed by the present invention;

[0033] Figure 4 A top view of a valve stem detection device proposed by the present invention;

[0034] Figure 5 for Figure 3 A cross-sectional view along the cutting line AA;

[0035] Figure 6 for Figure 2 A cross-sectional view along the cutting line BB;

[0036] Figure 7 for Figure 5 A cross-sectional view along the cutting line CC;

[0037] Figure 8 for Figure 5 A partial enlarged view of point Ⅰ in the middle;

[0038] Fig. 9 for Figure 5 A partial enlarged view of the middle II;

[0039] Fig.10 for Figure 4 A partial enlarged view of the middle part III;

[0040] Fig.11 for Figure 6 A partial enlarged view of the middle IV;

[0041] Fig.12 for Figure 1 A partial enlarged view of point V in the middle.

[0042] Among them, 1. frame assembly, 2. double-point shape detection mechanism, 3. transmission belt drive mechanism, 4. locking conversion mechanism, 5. fixed frame, 6. rigid guide rail, 7. support rod, 8. detection support assembly, 9. circulation lifting assembly, 10. detection alarm assembly, 11. bow bracket, 12. shaft seat, 13. lifting drive shaft, 14. lifting driven gear, 15. lifting guide wheel, 16. lifting guide rod, 17. disc terminal, 18. induction roller, 19. permanent magnet, 20. induction coil, 21. annular wave slide, 22. arc end, 23. annular positive pole, 24. annular negative pole, 25. arc side wall, 26. coil positive Pole, 27, coil negative pole, 28, valve stem clamping assembly, 29, rotating support assembly, 30, drive assembly, 31, valve stem body, 32, limit slot, 33, three-jaw chuck, 34, sliding block, 35, center bearing, 36, gear rotating shaft, 37, drive belt, 38, main drive gear, 39, lifting drive gear, 40, gear locking assembly, 41, transverse locking assembly, 42, telescopic cylinder, 43, locking pin, 44, liquid dispensing head bracket, 45, three-way liquid dispensing head, 46, spring mounting plate, 47, synchronization spring, 48, telescopic locking leg, 49, end piston, 50, locking tooth portion, 51, main pipe portion, 52, branch pipe portion.

[0043] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0046] like Figure 1 to Figure 12As shown, the present invention proposes a valve stem detection device, including a frame assembly 1, a dual-point shape detection mechanism 2, a conveyor belt drive mechanism 3 and a locking conversion mechanism 4, the frame assembly 1 includes a fixed frame 5 and a rigid guide rail 6, the fixed frame 5 is provided with a support rod portion 7 at the upper and lower parts, and the rigid guide rail 6 is fixedly connected to the support rod portion 7.

[0047] On the one hand, the rigid guide rail 6 can guide the overall conveying of the conveyor belt drive mechanism 3 , and on the other hand, the position accuracy of the valve stem body 31 can be ensured during detection through the cooperation between the rigid guide rail 6 and the sliding block 34 .

[0048] The double-point shape detection mechanism 2 is arranged in an array along the direction of the rigid guide rail 6, and the double-point shape detection mechanism 2 is symmetrically arranged on both sides of the rigid guide rail 6, wherein the symmetrically arranged double-point shape detection mechanism 2 is grouped in pairs, and no less than two groups are arranged in total.

[0049] The transmission belt type driving mechanism 3 is slidably arranged on the rigid guide rail 6 , and the locking conversion mechanism 4 is arranged on the transmission belt type driving mechanism 3 .

[0050] The conveyor belt drive mechanism 3 includes a valve stem clamping assembly 28, a rotating support assembly 29 and a driving assembly 30. The rotating support assembly 29 and the driving assembly 30 are symmetrically arranged at both ends of the valve stem clamping assembly 28. The rotating support assembly 29 is slidably arranged in the rigid guide rail 6, and the driving assembly 30 is arranged on the rotating support assembly 29.

[0051] The valve stem clamping assembly 28 includes a valve stem body 31, a limit slot 32 and a three-jaw chuck 33. The limit slot 32 is clamped at one end of the valve stem body 31, and the three-jaw chuck 33 is clamped at the other end of the valve stem body 31. The induction roller 18 is provided with an arcuate side wall 25. In one set of symmetrically arranged double-point shape detection mechanisms 2, the spacing of the arcuate side walls 25 is smaller than the standard diameter of the valve stem body 31. In another set of symmetrically arranged double-point shape detection mechanisms 2, the spacing of the arcuate side walls 25 is greater than the standard diameter of the valve stem body 31.

[0052] The valve stem body 31 can be fixed by the limiting groove 32 and the three-jaw chuck 33 , and the central axis of the valve stem body 31 can be ensured to coincide with the central axis of the limiting groove 32 and the three-jaw chuck 33 .

[0053] The rotating support assembly 29 includes a sliding block 34, a center bearing 35 and a gear rotating shaft 36. The gear rotating shaft 36 is arranged at both ends of the limit slot 32 and the three-jaw chuck 33. The center bearing 35 is engaged with the gear rotating shaft 36, and the sliding block 34 is engaged with the center bearing 35. The sliding block 34 is engaged and slidably arranged in the rigid guide rail 6.

[0054] The driving assembly 30 includes a driving toothed belt 37, a main driving gear 38 and a lifting driving gear 39. The driving toothed belt 37 is slidably arranged on the rigid guide rail 6. The driving toothed belt 37 is driven by an external driving device. The main driving gear 38 is engaged with the gear rotating shaft 36. The main driving gear 38 and the gear rotating shaft 36 are fixedly connected. The lifting driving gear 39 is arranged on the main driving gear 38. The main driving gear 38 and the driving toothed belt 37 are meshed for transmission. The lifting driving gear 39 and the lifting driven gear 14 are meshed for transmission.

[0055] The drive belt 37 and the main drive gear 38 remain engaged. If the position of the sliding block 34 is locked, the main drive gear 38 will rotate under the drive of the drive belt 37. If the main drive gear 38 is locked, the main drive gear 38 will translate along with the drive belt 37. During the continuous movement of the drive belt 37, the displacement mode and the in-situ detection mode are switched by whether the main drive gear 38 is locked.

[0056] The locking conversion mechanism 4 includes a gear locking assembly 40 and a transverse locking assembly 41. The gear locking assembly 40 is arranged on the sliding block 34, and the transverse locking assembly 41 is arranged on the gear locking assembly 40; the gear locking assembly 40 includes a telescopic cylinder 42, a locking pin 43 and a liquid dispensing head bracket 44. The telescopic cylinder 42 is arranged on the sliding block 34, and an end piston 49 is arranged at the end of the telescopic cylinder 42. The locking pin 43 is arranged on the end piston 49, and a locking tooth portion 50 matching the main driving gear 38 is arranged on the locking pin 43. The liquid dispensing head bracket 44 is arranged on the outside of the telescopic cylinder 42.

[0057] The transverse locking assembly 41 includes a three-way liquid distributor 45, a spring mounting plate 46, a synchronization spring 47 and a telescopic locking leg 48. The three-way liquid distributor 45 is arranged on the liquid distributor bracket 44. The three-way liquid distributor 45 is composed of a main pipe part 51 and a branch pipe part 52. The spring mounting plate 46 is fixedly connected to the middle position of the branch pipe part 52. The telescopic locking leg 48 is slidably arranged in the branch pipe part 52. The synchronization spring 47 is arranged between the spring mounting plate 46 and the telescopic locking leg 48.

[0058] The mode switching can be controlled by the extension and retraction of the telescopic cylinder 42, and when the main drive gear 38 is locked, the rigid guide rail 6 and the telescopic cylinder 42 are unlocked; when the rigid guide rail 6 and the telescopic cylinder 42 are locked by the telescopic locking leg 48, the main drive gear 38 is also unlocked at the same time.

[0059] The dual-point shape detection mechanism 2 includes a detection support assembly 8, a circulating lifting assembly 9 and a detection alarm assembly 10. The detection support assembly 8 is arranged on the fixed frame 5, the circulating lifting assembly 9 is rotatably arranged on the detection support assembly 8, the detection alarm assembly 10 is rotatably arranged on the circulating lifting assembly 9, and the detection alarm assembly 10 is arranged in an array.

[0060] The detection support assembly 8 includes a bow-shaped bracket 11, a rotating shaft seat 12, a lifting drive rotating shaft 13 and a lifting driven gear 14. The bow-shaped bracket 11 is arranged on the fixed frame 5, the rotating shaft seat 12 is arranged on the bow-shaped bracket 11, the lifting drive rotating shaft 13 is rotatably arranged in the rotating shaft seat 12, and the lifting driven gear 14 is engaged with the lifting drive rotating shaft 13.

[0061] The circulating lifting component 9 includes a lifting guide wheel 15 and a lifting guide rod 16. The lifting guide wheel 15 is clamped on the lifting drive shaft 13. An annular wave slide groove 21 is provided inside the lifting guide wheel 15. The lifting guide rod 16 is clamped and slidably provided in the bow-shaped bracket 11. The lifting guide rod 16 can only slide axially relative to the bow-shaped bracket 11 but cannot rotate relatively. Arc-shaped end portions 22 are provided at both ends of the lifting guide rod 16. The arc-shaped end portions 22 are in sliding contact with the annular wave slide groove 21.

[0062] When the transmission belt drive mechanism 3 is locked and fixed, the lifting drive shaft 13 can be driven to rotate by the self-rotation of the transmission belt drive mechanism 3. When the lifting drive shaft 13 rotates, the lifting guide wheel 15 can be used to control the small-amplitude longitudinal reciprocating lifting of the lifting guide rod 16, so that the detection area of ​​the arc-shaped side wall 25 is expanded from a point to a line, and then the self-rotation of the valve stem body 31 is combined with the detection range to expand from a line to a surface, so as to feedback whether the size of the valve stem body 31 is within the qualified range.

[0063] The detection alarm component 10 includes a disc terminal 17, an induction roller 18, a permanent magnet 19 and an induction coil 20. The disc terminal 17 is fixedly connected to the lifting guide rod 16. The disc terminal 17 is provided with an annular positive pole 23 and an annular negative pole 24. The induction roller 18 is rotatably arranged on the lifting guide rod 16. The permanent magnet 19 is symmetrically arranged on the induction roller 18. The induction coil 20 is evenly distributed in an annular manner on the induction roller 18. The induction coil 20 is provided with a coil positive pole 26 and a coil negative pole 27. The coil positive pole 26 is in contact with the annular positive pole 23, and the coil negative pole 27 is in contact with the annular negative pole 24.

[0064] When the induction rollers 18 on the same lifting guide rod 16 are relatively stationary, no current will be generated. If some of the induction rollers 18 rotate relative to other induction rollers 18, the induction coil 20 will generate current. By determining whether the induced current is generated, it can be determined whether the external dimensions of the valve stem body 31 are within the standard range.

[0065] When in use, the user first needs to make the main driving gear 38 locked by the locking pin 43 and the telescopic locking leg 48 not contact the rigid guide rail 6, and then drive the toothed belt 37 to drive the transmission belt drive mechanism 3 and the locking conversion mechanism 4 to slide along the rigid guide rail 6 as a whole; when the central axis of the valve stem body 31 moves to the plane formed by the central axes of the two lifting guide rods 16, the end piston 49 of the telescopic cylinder 42 is controlled to extend;

[0066] When the end piston 49 is extended, on the one hand, the locking pin 43 is controlled to be away from the main drive gear 38, thereby releasing the lock of the main drive gear 38. On the other hand, the end piston 49 slides in the main pipe part 51, so that the liquid in the main pipe part 51 can be pressed into the branch pipe part 52. Due to the presence of the spring mounting plate 46 and the synchronous spring 47, the telescopic locking legs 48 on both sides are extended synchronously until the telescopic locking legs 48 contact and press on the rigid guide rail 6, thereby completing the locking of the position of the sliding block 34.

[0067] After the position of the sliding block 34 is locked, when the driving toothed belt 37 continues to rotate, it will rotate the main driving gear 38 through the meshing between itself and the main driving gear 38, and at the same time, the lifting driving gear 39 and the gear rotating shaft 36 will rotate together, and then the valve stem clamping assembly 28 will rotate. At this time, the lifting driving gear 39 will also rotate with the lifting driven gear 14. The lifting driven gear 14 rotates with the lifting driving shaft 13 and the lifting guide wheel 15 also rotates together. Through the cooperation of the annular wave slide groove 21 and the lifting guide rod 16, the lifting guide rod 16 will reciprocate and rise and fall in a small range in the arch bracket 11;

[0068] The symmetrically arranged double-point shape detection mechanisms 2 are arranged in pairs, and no less than two groups are arranged in total; if multiple groups are arranged, the product can be tested to be qualified based on multiple range standards. If two groups are arranged in total, then in one group, the distance between the arc-shaped side walls 25 of the two symmetrically distributed inductive rollers 18 should be equal to the lower limit of the dimensional tolerance of the valve stem body 31; in the other group, the distance between the arc-shaped side walls 25 of the two symmetrically distributed inductive rollers 18 should be equal to the upper limit of the dimensional tolerance of the valve stem body 31;

[0069] If the size of the valve stem body 31 is qualified, when the valve stem body 31 rotates at the first detection position, all the induction rollers 18 at this position should rotate synchronously under the drive of the valve stem body 31, and the induction coil 20 does not generate current at this time; when the valve stem body 31 rotates at the second detection position, all the induction rollers 18 at this position do not contact the valve stem body 31, and all the induction rollers 18 do not rotate at this time, and the induction coil 20 does not generate current at this time;

[0070] If the induction coil 20 generates current during the detection process, it means that the induction roller 18 on the same lifting guide rod 16 has undergone relative rotation, which is equivalent to the induction coil 20 rotating in the magnetic field of the adjacent detection alarm component 10. The asynchronous movement of the induction roller 18 on the same lifting guide rod 16 indicates that there is an error in the external dimensions of the valve stem body 31. When current is detected in the induction coil 20, an alarm can be issued.

[0071] The arc-shaped side wall 25 is in point contact with the valve stem body 31. The equivalent range of this point contact can be expanded to line contact by lifting and lowering the lifting guide rod 16. Combined with the rotation of the valve stem body 31 itself, the entire outer surface of the valve stem body 31 can be tested.

[0072] The pre-weight detection method can prevent the valve stem body 31 from being too thick or too thin as a whole. If an alarm occurs during the detection process, it means that the valve stem body 31 is not an approximate standard cylinder, but may have dimensional problems such as excessive bending of the axis, low roundness, uneven diameter, etc.

[0073] After the detection is completed, the background records the detection result of the workpiece for subsequent sorting, and then the end piston 49 is slid by the retraction of the telescopic cylinder 42. When the end piston 49 slides, on the one hand, it can lock the contact between the sliding block 34 and the rigid guide rail 6 through the retraction of the telescopic locking leg 48, and on the other hand, it can lock the main drive gear 38 through the locking tooth portion 50. After the main drive gear 38 cannot rotate, the drive toothed belt 37 will move the main drive gear 38 to the next position.

[0074] Since the position of the sliding block 34 is fixed by extending the telescopic locking leg 48, a higher positioning accuracy can be achieved, and the locking of the main drive gear 38 is achieved by the cooperation of the locking tooth portion 50 and the main drive gear 38, so the position accuracy requirement is also lower.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0076] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A valve stem detection device, characterized in that: The invention comprises a frame assembly (1), a dual-point shape detection mechanism (2), a conveyor belt drive mechanism (3) and a locking conversion mechanism (4), wherein the frame assembly (1) comprises a fixed frame (5) and a rigid guide rail (6), the fixed frame (5) is provided with a support rod portion (7) at the top and the bottom, and the rigid guide rail (6) is fixedly connected to the support rod portion (7); The dual-point shape detection mechanisms (2) are arranged in an array along the direction of the rigid guide rail (6), and the dual-point shape detection mechanisms (2) are symmetrically arranged on both sides of the rigid guide rail (6), wherein the symmetrically arranged dual-point shape detection mechanisms (2) form a group of two, and a total of no less than two groups are arranged; The transmission belt type driving mechanism (3) is slidably arranged on a rigid guide rail (6), and the locking conversion mechanism (4) is arranged on the transmission belt type driving mechanism (3); The dual-point shape detection mechanism (2) comprises a detection support component (8), a cyclic lifting component (9) and a detection alarm component (10), wherein the detection support component (8) is arranged on a fixed frame (5), the cyclic lifting component (9) is rotatably arranged on the detection support component (8), the detection alarm component (10) is rotatably arranged on the cyclic lifting component (9), and the detection alarm components (10) are arranged in an array; The transmission belt drive mechanism (3) comprises a valve stem clamping assembly (28), a rotating support assembly (29) and a driving assembly (30); the rotating support assembly (29) comprises a sliding block (34), a center bearing (35) and a gear rotating shaft (36); the driving assembly (30) comprises a driving toothed belt (37), a main driving gear (38) and a lifting driving gear (39); The locking conversion mechanism (4) comprises a gear locking assembly (40) and a transverse locking assembly (41); the gear locking assembly (40) is arranged on the sliding block (34), and the transverse locking assembly (41) is arranged on the gear locking assembly (40); the gear locking assembly (40) comprises a telescopic cylinder (42), a locking pin (43) and a liquid dispensing head bracket (44); the telescopic cylinder (42) is arranged on the sliding block (34); an end piston (49) is arranged at the end of the telescopic cylinder (42); the locking pin (43) is arranged on the end piston (49); a locking tooth portion (50) matching the main driving gear (38) is arranged on the locking pin (43); and the liquid dispensing head bracket (44) is arranged outside the telescopic cylinder (42); The transverse locking assembly (41) comprises a three-way liquid dispensing head (45), a spring mounting plate (46), a synchronous spring (47) and a telescopic locking leg (48); the three-way liquid dispensing head (45) is arranged on a liquid dispensing head bracket (44); the three-way liquid dispensing head (45) comprises a main pipe portion (51) and a branch pipe portion (52); the spring mounting plate (46) is fixedly connected to a middle position of the branch pipe portion (52); the telescopic locking leg (48) is slidably arranged in the branch pipe portion (52); and the synchronous spring (47) is arranged between the spring mounting plate (46) and the telescopic locking leg (48).

2. A valve stem detection device according to claim 1, characterized in that: The detection support assembly (8) comprises an arch-shaped bracket (11), a rotating shaft seat (12), a lifting drive rotating shaft (13) and a lifting driven gear (14); the arch-shaped bracket (11) is arranged on a fixed frame (5); the rotating shaft seat (12) is arranged on the arch-shaped bracket (11); the lifting drive rotating shaft (13) is rotatably arranged in the rotating shaft seat (12); and the lifting driven gear (14) is engaged with the lifting drive rotating shaft (13).

3. A valve stem detection device according to claim 2, characterized in that: The cyclic lifting component (9) comprises a lifting guide wheel (15) and a lifting guide rod (16); the lifting guide wheel (15) is snap-fitted on the lifting drive shaft (13); an annular wave slide groove (21) is provided inside the lifting guide wheel (15); the lifting guide rod (16) is snap-fitted and slidably provided in the arch support (11); the lifting guide rod (16) can only slide axially but cannot rotate relative to the arch support (11); arc-shaped end portions (22) are provided at both ends of the lifting guide rod (16); the arc-shaped end portions (22) are in sliding contact with the annular wave slide groove (21).

4. A valve stem detection device according to claim 3, characterized in that: The detection alarm component (10) comprises a disk terminal (17), an induction roller (18), a permanent magnet (19) and an induction coil (20); the disk terminal (17) is fixedly connected to the lifting guide rod (16); an annular positive electrode (23) and an annular negative electrode (24) are provided on the disk terminal (17); the induction roller (18) is rotatably arranged on the lifting guide rod (16); the permanent magnet (19) is symmetrically arranged on the induction roller (18); the induction coil (20) is evenly distributed in an annular shape on the induction roller (18); a coil positive electrode (26) and a coil negative electrode (27) are provided on the induction coil (20); the coil positive electrode (26) and the annular positive electrode (23) are in contact and conduction with each other; and the coil negative electrode (27) and the annular negative electrode (24) are in contact and conduction with each other.

5. A valve stem detection device according to claim 4, characterized in that: A rotating support assembly (29) and a driving assembly (30) are symmetrically provided at both ends of the valve stem clamping assembly (28); the rotating support assembly (29) is slidably arranged in a rigid guide rail (6), and the driving assembly (30) is arranged on the rotating support assembly (29).

6. A valve stem detection device according to claim 5, characterized in that: The valve stem clamping assembly (28) comprises a valve stem body (31), a limit slot (32) and a three-jaw chuck (33), wherein the limit slot (32) is snap-fitted at one end of the valve stem body (31), and the three-jaw chuck (33) is snap-fitted at the other end of the valve stem body (31). The sensing roller (18) is provided with an arcuate side wall (25), and in one set of symmetrically arranged double-point shape detection mechanisms (2), the spacing of the arcuate side walls (25) is smaller than the standard diameter of the valve stem body (31), and in another set of symmetrically arranged double-point shape detection mechanisms (2), the spacing of the arcuate side walls (25) is larger than the standard diameter of the valve stem body (31).

7. A valve stem detection device according to claim 6, characterized in that: The gear rotating shaft (36) is arranged at both ends of the limit clamping groove (32) and the three-jaw chuck (33), the center bearing (35) is engaged with the gear rotating shaft (36), the sliding block (34) is engaged with the center bearing (35), and the sliding block (34) is engaged and slidably arranged in the rigid guide rail (6).

8. A valve stem detection device according to claim 7, characterized in that: The drive toothed belt (37) is slidably arranged on the rigid guide rail (6), the drive toothed belt (37) is driven by an external driving device, the main drive gear (38) is engaged with the gear rotating shaft (36), the main drive gear (38) and the gear rotating shaft (36) are fixedly connected, the lifting drive gear (39) is arranged on the main drive gear (38), the main drive gear (38) and the drive toothed belt (37) are meshed for transmission, and the lifting drive gear (39) and the lifting driven gear (14) are meshed for transmission.

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