Feedback type valve limit switch

Abstract

The invention provides a feedback type valve limit switch and relates to a valve limit switch, the feedback type valve limit switch comprises a lower shell and an upper shell which are connected with each other, and a transmission shaft is movably arranged in the lower shell and used for being connected with an external valve control shaft; the first cam and the second cam are sequentially arranged on the surface of the transmission shaft in a sleeving mode from top to bottom; the first microswitch and the second microswitch are distributed on the side wall of the lower shell and are installed with the first cam and the second cam in a matched mode respectively. Through the arranged adjusting element and the adjusting piece, adjustment of the horizontal position and the height position of the first cam and the second cam can be completed only by operating the driving element in the overhaul groove of the upper shell, the limitation effect of the shell space is avoided, and compared with a traditional limiting switch, the limiting switch has the advantages that the operation is simple, and the operation is convenient. The whole disassembly of the shell and the disassembly of surrounding components are not needed to make room for the calibration operation of the cam, and the actual use is facilitated.

Description

Technical Field

[0001] The invention relates to the field of limit switches, and in particular to a feedback valve limit switch. Background Art

[0002] The valve limit switch mainly includes a pair of micro switches, an upper cam, a lower cam and a connecting shaft. The upper cam and the lower cam are both connected to the transmission shaft, and the transmission shaft is connected to the drive shaft of the actuator. The upper cam and the lower cam trigger two micro switches respectively during the rotation of the drive shaft to monitor the open position and closed position of the valve.

[0003] Since the cam part on the existing transmission shaft is locked by a compression spring and a limit pin, the cam is easily separated from the limit pin when it is subjected to the vibration impact of the valve opening and closing process and the strong vibration of the equipment in actual use. After long-term use, its position will gradually change. Therefore, it is necessary to regularly calibrate the position of the cam and the corresponding micro switch, otherwise it will lead to inaccurate monitoring of the valve opening and closing positions, resulting in the valve position feedback not being consistent with the actual state of the valve; However, due to the small size of the valve limit switch, the limited internal space, and the arrangement of multiple circuits, the shell needs to be disassembled as a whole during the actual adjustment process, and then the components around the cam need to be disassembled one by one to make enough space. Only then can the position of the limit pin on the outside of the cam be disassembled with auxiliary tools and then corrected. This makes the operation more cumbersome and the correction inconvenient. Therefore, we have made improvements and proposed a feedback valve limit switch. Summary of the invention

[0004] The object of the present invention is to provide a feedback valve limit switch, which solves the problem of inconvenience in cam adjustment due to space limitation by arranging an adjustment element and a release element.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: A feedback valve limit switch, comprising a lower housing and an upper housing connected to each other, wherein a transmission shaft is movably arranged in the lower housing for connecting with an external valve control shaft, and further comprising; Cam 1 and cam 2 are sequentially sleeved on the surface of the transmission shaft from top to bottom; Micro switch 1 and micro switch 2 are distributed on the side wall of the lower housing and are respectively adapted to be installed with cam 1 and cam 2; An adjusting element is sleeved on the surface of the transmission shaft and has two sets of adjusting parts, wherein the adjusting element is connected to the corresponding cam 1 and cam 2 respectively through the adjusting parts thereon, and the cam 1 and cam 2 can be adjusted to the position relative to the corresponding micro switch 1 and micro switch 2 under the action of the adjusting parts; The adjusting member comprises a support plate and an adjusting plate fixed to the surface of the adjusting element, a support spring is fixed to the surface of the support plate, and the support spring is sleeved on the surface of the adjusting element and connected to the bottom of the corresponding cam 1 or cam 2; Wherein, the surface of the adjustment disk has an adjustment groove for connecting and assembling with the corresponding cam 1 or cam 2; The driving element is arranged above the adjusting element and is used for pressing the cam 1 and the cam 2 to form a position adjustment on the adjusting element.

[0006] As a preferred technical solution of the present application, the adjustment slot includes a height slot and a horizontal slot; There are two height slots, which are symmetrically distributed on both sides of the adjustment plate, and the horizontal slot is arranged on one side of the height slot and is interconnected with the height slot; The horizontal grooves have multiple groups, and the multiple groups of horizontal grooves are distributed on the surface of the adjustment disk at equal intervals.

[0007] As a preferred technical solution of the present application, a slider corresponding to and adapted to the height slot is fixed on the inner side of the cam 1 and the cam 2, and a locking block is provided on the top of the slider; The height of the horizontal groove is greater than the combined height of the locking block and the sliding block; The top wall of the horizontal groove has a locking groove for locking with a locking block to form a position lock for cam one or cam two.

[0008] As a preferred technical solution of the present application, the adjusting element comprises a sleeve sleeved on the surface of the transmission shaft, and the supporting plate and the adjusting plate are both fixed on the surface of the sleeve; A locking platform is extended outward from the top of the sleeve, a trapezoidal block is slidably arranged inside the locking platform, and a trapezoidal groove matching the trapezoidal block is formed on the surface of the transmission shaft at a position corresponding to the trapezoidal block; One side of the trapezoidal block is connected with a locking spring fixed to the side wall of the locking platform. The trapezoidal block is slidably opposed to slide in the trapezoidal groove by the force of the locking spring to form mutual locking between the transmission shaft and the sleeve.

[0009] As a preferred technical solution of the present application, the driving element comprises a central disk sleeved on the top of the transmission shaft and an outer disk movably sleeved on the outer side of the central disk, and a support portion extends from one side of the outer disk for connecting the adjustment rod thereon; The surface of the support portion is threadedly provided with a bolt for locking the height of the upper adjustment rod thereof.

[0010] As a preferred technical solution of the present application, transmission rods are slidably provided on both sides of the top of the locking platform, and a through hole for the transmission rod to pass through is opened on the center disk.

[0011] As a preferred technical solution of the present application, support columns are fixed at positions near the through holes on both sides of the top of the center disk, and a universal ball is movably embedded in the top of the support column, and the surfaces of the two universal balls are commonly fixedly connected with a handle seat; Wherein, both ends of the handle seat are provided with through slots for the transmission rod to pass through.

[0012] As a preferred technical solution of the present application, the trapezoidal block has an interfering inclined surface, a connecting groove is formed at the end of the interfering inclined surface, and a stabilizing groove is formed on one side wall of the connecting groove; The bottom of one side of the transmission rod is connected with a convex buckle for connecting with the stabilizing groove.

[0013] As a preferred technical solution of the present application, a support element for supporting the driving element is slidably provided on one side of the top of the upper shell; The supporting element comprises a sliding plate slidably arranged on the top of one side of the upper shell, a sliding seat slidably arranged in the sliding plate, and an extension plate rotatably connected to the sliding seat; Wherein, an L-shaped plate is slidably provided at the end of the extension plate, and a bottom groove adapted to the end of the L-shaped plate is provided at the bottom of the center plate, and the center plate can be kept in a positioned state by the locking effect of the L-shaped plate and the bottom groove; The top of the upper shell is provided with an inspection slot, and the top of the upper shell is fixed with an inspection cover by screws for sealing and protecting the inspection slot.

[0014] As a preferred technical solution of the present application, a protective cylinder is fixed on the inspection cover, a feedback column is rotatably arranged in the protective cylinder, two opposite sides of the top of the feedback column have opening areas, and the other two opposite sides of the top of the feedback column have closing areas; The top of the protective tube is provided with a protective cover, two opposite sides of the top of the protective cover are provided with transparent areas, and the other two opposite sides of the top of the protective cover are provided with shielding areas; A movable ring is provided on the sliding sleeve of the surface of the protective tube, and a conflict bolt is threaded through one side of the movable ring. One end of the transmission shaft extends to the bottom of the feedback column and is movably connected to it. Rotating the conflict bolt can make one end of it pass through the feedback column and contact the surface of the transmission shaft, so that the transmission shaft can directly drive the feedback column to rotate and feedback.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the scheme of this application: 1. Through the setting of the adjusting element and adjusting piece, the horizontal position and height position of the cam 1 and the cam 2 can be adjusted by operating the driving element in the inspection slot of the upper shell, without being limited by the shell space. Compared with the traditional limit switch, there is no need to disassemble the entire shell and the surrounding components to make room for the cam calibration operation, which is convenient for actual use; 2. Through the provided driving element and adjusting element, it is realized that during the rotation of the outer disk outside the center disk, the supporting element can realize the positioning of the transmission shaft by positioning the center disk, ensuring that during the rotation calibration of cam 1 and cam 2, the transmission shaft will not rotate synchronously, thus ensuring the accuracy of calibration adjustment; At the same time, the supporting element can support the driving element without the need for adjustment, so that the driving element is supported above the sleeve without forming any movement obstruction with the cam 1 and cam 2 in a rotating state.

[0016] 3. Through the cooperation of the set trapezoidal block, trapezoidal groove and transmission rod, the transmission rod can be pressed down to release the locking of the trapezoidal groove by the trapezoidal block, complete the separation of the locking platform and the transmission shaft, and make the convex buckle on the transmission rod engage with the stable groove, and the adjusting element, the adjusting part, the cam one and the cam two can be directly taken out synchronously, which is convenient for the overall disassembly, maintenance and replacement, further improves the actual application operation, and is convenient for subsequent maintenance; 4. Through the provision of the protective cylinder, the transmission shaft drives the cam 1 or cam 2 to rotate so that it contacts the micro switch 1 or micro switch 2 to monitor the signal of valve opening or closing. The relative position of the feedback column and the protective cover can be used to provide synchronous feedback to the outside to assist the operator in judging the status of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a feedback valve limit switch provided in this application; Figure 2 A schematic diagram of the internal structure of a feedback valve limit switch provided in this application; Figure 3 A schematic diagram of the structure of an adjusting element of a feedback valve limit switch provided in this application; Figure 4 A schematic diagram of the structure of an adjustment slot of a feedback valve limit switch provided in this application; Figure 5 A schematic diagram of the maintenance state structure of a feedback valve limit switch provided in this application; Figure 6 A feedback valve limit switch provided in this application Figure 5 The enlarged structural diagram at A in the middle; Figure 7 A schematic diagram of the disassembled structure of a feedback valve limit switch provided in this application; Figure 8 A schematic diagram of the structure of a support element of a feedback valve limit switch provided in this application; Fig. 9A schematic diagram of the locking state structure of a locking platform and a transmission shaft of a feedback type valve limit switch provided in the present application; Fig.10 A schematic diagram of the structure of a feedback valve limit switch provided in the present application in a state where the locking platform and the transmission shaft are separated; Fig.11 A schematic diagram of the protective tube structure of a feedback valve limit switch provided in this application; Fig.12 A feedback valve limit switch provided in this application Fig.11 The enlarged structural diagram at B in the middle; Fig.13 A schematic diagram of the top view structure of a protective cylinder of a feedback type valve limit switch provided in the present application; Fig.14 A schematic diagram of the feedback column structure of a feedback valve limit switch provided in this application; Fig.15 A schematic diagram of the protective cover structure of a feedback valve limit switch provided in this application; Fig.16 A feedback valve limit switch provided in this application Figure 8 The enlarged structural diagram at C; Fig.17 A feedback valve limit switch provided in this application Fig.10 Enlarged structural diagram at D.

[0018] Indicated in the figure: 1. Lower shell; 2. Upper shell; 3. Adjusting element; 4. Adjusting member; 5. Supporting element; 6. Protective tube; 7. Driving element; 11. Transmission shaft; 12. Cam 1; 13. Cam 2; 14. Micro switch 1; 15. Micro switch 2; 16. Pneumatic interface; 120, tank body; 21. Inspection slot; 22. Inspection cover; 31. Sleeve; 32. Locking platform; 33. Trapezoidal block; 34. Trapezoidal groove; 35. Locking spring; 36. Transmission rod; 330, conflicting inclined surface; 331, connecting groove; 332, stabilizing groove; 360, convex buckle; 41. Support plate; 42. Adjustment plate; 43. Support spring; 44. Adjustment slot; 440, height slot; 441, horizontal slot; 442, slider; 443, locking block; 444, locking slot; 51. Sliding plate; 52. Sliding seat; 53. Extension plate; 54. L-shaped plate; 55. Bottom groove; 56. Positioning bolt; 61. Feedback column; 62. Opening area; 63. Closing area; 64. Protective cover; 65. Transparent area; 66. Shielding area; 67. Movable ring; 68. Interference bolt; 71. center plate; 72. outer plate; 73. support portion; 74. adjustment rod; 75. bolt; 76. through hole; 710, support column; 711, universal ball; 712, handle seat; 713, through groove. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0020] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. 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.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] See also Figures 1 to 17 The present invention provides a technical solution: a feedback valve limit switch, comprising a lower shell 1 and an upper shell 2 connected to each other, wherein a transmission shaft 11 is movably provided in the lower shell 1 for connecting with an external valve control shaft, such as Figure 1As shown, the front of the lower housing 1 has a pneumatic interface 16, and the external pneumatic equipment is connected to the pneumatic interface 16, and the valve control shaft and the transmission shaft 11 are driven by pneumatic control. The specific structure and driving method are mature and perfect existing technologies, so they are not further described in this embodiment, and also include; Cam 1 12 and cam 2 13 are sequentially sleeved on the surface of the transmission shaft 11 from top to bottom; The micro switch 14 and the micro switch 2 15 are distributed on the side wall of the lower housing 1 and are respectively adapted to be installed with the cam 12 and the cam 2 13. When the cam 12 and the cam 2 13 follow the transmission shaft 11 to rotate synchronously, the cam 12 will contact the surface of the micro switch 14 to trigger an opening signal. When the cam 12 leaves the micro switch 14, the cam 2 13 will contact the surface of the micro switch 2 15 to trigger a closing signal, so as to realize the monitoring of the valve opening and closing. Therefore, in the actual assembly process, the cam 1 12 and the cam 2 13 are arranged to be staggered with each other. In this embodiment, the staggered angle of the cam 1 12 and the cam 2 13 is 90 degrees; The adjusting element 3 is sleeved on the surface of the transmission shaft 11 and has two sets of adjusting members 4 thereon, wherein the adjusting element 3 is respectively connected with the corresponding cam 1 12 and cam 2 13 through the adjusting members 4 thereon, and the cam 1 12 and cam 2 13 can be adjusted relative to the corresponding micro switch 1 14 and micro switch 2 15 by the action of the adjusting members 4; The adjusting member 4 comprises a support plate 41 and an adjusting plate 42 fixed to the surface of the adjusting element 3, a support spring 43 is fixed to the surface of the support plate 41, and the support spring 43 is sleeved on the surface of the adjusting element 3 and contacts the bottom of the corresponding cam 1 12 or cam 2 13; An annular groove is formed at the bottom of the cam 12 or the cam 2 13 at a position corresponding to the support spring 43 for the end of the support spring 43 to contact the inside thereof, so that when the cam 1 12 or the cam 2 13 is rotated, the support spring 43 will not be driven to rotate and twist synchronously, thereby ensuring the support stability of the support spring 43; The surface of the adjustment disk 42 has an adjustment groove 44 for connecting and assembling with the corresponding cam 1 12 or cam 2 13; Under the supporting elastic force of the supporting spring 43 in the natural state, the cam 1 12 or the cam 2 13 connected thereto will be higher than the height of the corresponding adjusting disk 42, so that when the cam 1 12 or the cam 2 13 is connected in the adjusting groove 44 on the corresponding adjusting disk 42, the supporting spring 43 can give the cam 1 12 or the cam 2 13 sufficient supporting elastic force to meet the actual connection stability; The driving element 7 is disposed above the adjusting element 3 and is used to press the cam 1 12 and the cam 2 13 to adjust the position formed on the adjusting element 3. A supporting element 5 for supporting the driving element 7 is slidably disposed on one side of the top of the upper housing 2; The adjusting groove 44 includes a height groove 440 and a horizontal groove 441. There are two height grooves 440, which are symmetrically distributed on both sides of the adjusting disk 42. The horizontal groove 441 is provided on one side of the height groove 440 and is interconnected with the height groove 440. There are multiple groups of horizontal grooves 441, which are evenly spaced and distributed on the surface of the adjusting disk 42. The inner sides of the cam 1 12 and the cam 2 13 are both fixed with a slider 442 corresponding to and matching the height slot 440. The top of the slider 442 has a locking block 443. The height of the horizontal slot 441 is greater than the combined height of the locking block 443 and the slider 442. The top wall of the horizontal groove 441 has a locking groove 444 for locking with the locking block 443 to lock the position of the cam 1 12 or the cam 2 13; like Figure 2 The figure shows the normal use state of the limit switch. When it is found in the actual use process that the relative position of the cam 12 or the cam 2 13 and the corresponding micro switch 1 14 and the micro switch 2 15 is deviated, that is, when the cam 12 or the cam 2 13 rotates to the specified position and the micro switch 1 14 or the micro switch 2 15 does not respond or responds in advance, it indicates that the cam 12 or the cam 2 13 needs to be calibrated. The specific calibration steps are as follows: The cam 12 is pressed down by the driving element 7 so as to be inserted into the corresponding slot 120, and the locking block 443 on the cam 12 is disengaged from the corresponding locking slot 444. Then, the cam 12 is controlled to slide along the direction of the horizontal slot 441 through the slider 442, so that the relative position of the cam 12 and the corresponding micro switch 14 can be adjusted in the horizontal direction. When the cam 12 is adjusted to a suitable position, the downward pressure on the cam 12 is released, and the locking block 443 is clamped into the corresponding locking slot 444 by the force of the supporting spring 43, so that the relative position of the cam 12 and the micro switch 14 is adjusted. If the height of the cam 12 needs to be adjusted, after the cam 12 is pressed down by the driving element 7 so that the locking block 443 falls off the corresponding locking groove 444, the cam 12 is controlled to make the slider 442 thereon slide into the height groove 440 along the horizontal groove 441, and then the cam 12 is controlled to be at a suitable height in the height groove 440, and then the cam 12 is controlled to rotate in the corresponding horizontal groove 441, and after moving to a corresponding angle, the downward pressure on the cam 12 is released, and the force of the supporting spring 43 causes the locking block 443 on the slider 442 to be stuck in the corresponding locking groove 444 to complete the adjustment and locking of the cam 12; The position adjustment of the cam 2 13 is the same as that of the cam 1 12, and will not be repeated in this embodiment; The top of the upper shell 2 is provided with an inspection slot 21, and an inspection cover 22 is fixed to the top of the upper shell 2 by screws for blocking and protecting the inspection slot 21. By removing the screws, the inspection cover 22 can be removed from the upper shell 2 to expose the inspection slot 21, thereby satisfying the driving control of the driving element 7; Since the driving element 7 is arranged inside the upper shell 2, when it is necessary to adjust and calibrate the cam 1 12 and the cam 2 13, it is only necessary to control the driving element 7 in the inspection groove 21. Compared with the traditional valve limit switch, there is no need to completely disassemble the shell and remove the components inside it one by one to free up enough space for disassembly and calibration of the outer side of the cam, thereby improving the actual debugging efficiency and facilitating debugging use.

[0025] like Fig. 9 and Fig.10 As shown, the adjusting element 3 includes a sleeve 31 sleeved on the surface of the transmission shaft 11, and the supporting plate 41 and the adjusting plate 42 are both fixed on the surface of the sleeve 31; A locking platform 32 is extended outward from the top of the sleeve 31, a trapezoidal block 33 is slidably arranged inside the locking platform 32, and a trapezoidal groove 34 matching with the trapezoidal block 33 is formed on the surface of the transmission shaft 11 at a position corresponding to the trapezoidal block 33; One side of the trapezoidal block 33 is connected with a locking spring 35 fixed to the side wall of the locking platform 32. The trapezoidal block 33 is slidable in the trapezoidal groove 34 by the force of the locking spring 35 to form mutual locking between the transmission shaft 11 and the sleeve 31. The mutual locking between the trapezoidal block 33 and the trapezoidal groove 34 ensures the synchronous rotation between the transmission shaft 11 and the sleeve 31, so that when the transmission shaft 11 is rotated synchronously with the external valve control shaft, the cam 1 12 and the cam 2 13 will rotate synchronously. The driving element 7 includes a central disk 71 sleeved on the top of the transmission shaft 11 and an outer disk 72 movably sleeved on the outer side of the central disk 71. A support portion 73 is extended from one side of the outer disk 72 for connecting the adjustment rod 74 thereto. The outer disk 72 can rotate on the surface of the central disk 71. The surface of the support portion 73 is threaded with a bolt 75 for locking the height of the adjusting rod 74 thereon. After the bolt 75 is screwed to release the locking effect on the adjusting rod 74, the adjusting rod 74 can slide relatively on the surface of the support portion 73. The surfaces of the cam 1 12 and the cam 2 13 are both provided with a groove 120 for the end of the adjusting rod 74 to be inserted. When it is necessary to calibrate the position of cam 12, bolt 75 is taken out to move the height of adjusting rod 74 so that adjusting rod 74 moves into groove 120 on the surface of cam 12, and then bolt 75 is rotated to fix the height of adjusting rod 74. At this time, the center plate 71 can be pressed down so that the outer plate 72 thereon drives the adjusting rod 74 to move downward synchronously. The downwardly moved adjusting rod 74 will unlock cam 12 to adjust the position. The same is true for the adjustment method of cam 2 13. Since the positions of cam 12 and cam 2 13 are staggered and have multiple grooves 120 thereon, the adjusting rod 74 can extend into the groove 120 to adjust cam 2 13 without forming movement obstruction with cam 12. Transmission rods 36 are slidably disposed on both sides of the top of the locking platform 32, and a through hole 76 is provided on the center plate 71 for the transmission rods 36 to pass through; Support columns 710 are fixed at the positions near the through holes 76 on both sides of the top of the center plate 71. Universal balls 711 are movably embedded at the tops of the support columns 710. A handle seat 712 is fixedly connected to the surfaces of the two universal balls 711. Through slots 713 are provided at both ends of the handle seat 712 for the transmission rod 36 to pass through. When the position of the cam 12 is corrected as described above, the height of the center disk 71 can be moved first so that it passes through the transmission rod 36, and then the height of the adjusting rod 74 can be adjusted. In this way, when the outer disk 72 is rotated to adjust the adjusting rod 74, the center disk 71 can be positioned because the center disk 71 is limited by the transmission rod 36 and the locking platform 32, and the locking platform 32 and the sleeve 31 are in a fixed connection state. Therefore, pressing the center disk 71 to form a positioning effect is to form a positioning effect on the sleeve 31 and the transmission shaft 11 thereon. In this way, when the outer disk 72 is rotated to adjust the adjusting rod 74, the transmission shaft 11 and the adjusting member 4 thereon will not rotate synchronously, thereby ensuring the accuracy of the adjustment. The trapezoidal block 33 has an interfering inclined surface 330, a connecting groove 331 is formed at the end of the interfering inclined surface 330, a stabilizing groove 332 is formed on one side wall of the connecting groove 331, and a convex buckle 360 ​​is connected to the bottom of one side of the transmission rod 36 for connecting with the stabilizing groove 332; When the cam 12 and the cam 2 13 need to be replaced or further repaired, the handle seat 712 can be tilted to make the through groove 713 on it contact the surface of the transmission rod 36 to form a friction effect, and then the handle seat 712 can be pressed down to drive the transmission rod 36 to move downward synchronously. During the downward movement, the transmission rod 36 will form a friction effect with the friction slope 330, and the trapezoidal block 33 subjected to the friction force will be as follows. Fig. 9 As shown, it will slide toward both sides, and finally the trapezoidal block 33 will be separated from the corresponding transmission shaft 11, and the locking state between the sleeve 31 and the transmission shaft 11 will be released. Further, the transmission rod 36 will slide in the connecting groove 331, and then the locking spring 35 will cause the protruding buckle 360 ​​to engage with the stable groove 332 to form a Fig.10 In the state shown, the transmission rod 36 can be pulled upward to synchronously remove and disassemble the sleeve 31, the adjustment member 4, the cam 1 12 and the cam 2 13 without sequentially disassembling the housing and its internal parts; After the above-mentioned “pulling the transmission rod 36 upward to synchronously remove and disassemble the sleeve 31, the adjusting member 4, the cam 1 12 and the cam 2 13”, after the components removed from the outside are inspected or cleaned, since the convex buckle 360 ​​and the stabilizing groove 332 are still in a stable engaging state at this time, after resetting them on the surface of the transmission shaft 11, it is necessary to manually press the locking platform 32 downward to make it stable relative to the transmission shaft 11, and then synchronously pull the transmission rod 36 upward. Since the locking platform 32 is in a stationary state at this time, the convex buckle 360 ​​thereon will gradually disengage from the corresponding stabilizing groove 332 during the process of pulling the transmission rod 36. When the transmission rod 36 is completely disengaged from the stabilizing groove 332, the locking spring 35 is reset at this time, which can cause the trapezoidal block 33 to slide toward the direction of the transmission shaft 11 and finally engage with the corresponding trapezoidal groove 34, thus completing the reset installation of the overall structure such as the cam 12 and the cam 2 13 after disassembly, and forming the locking effect between the locking platform 32 and the transmission shaft 11 again; The supporting element 5 includes a sliding plate 51 slidably disposed on the top of one side of the upper shell 2, a sliding seat 52 slidably disposed in the sliding plate 51, and an extension plate 53 rotatably connected to the sliding seat 52. A positioning bolt 56 is threadedly penetrated on one side of the sliding plate 51. Fig.12 As shown, under the action of the sliding seat 52, the extension plate 53 can no longer be turned downward but can only be turned upward, and the sliding plate 51 can slide along the height direction of the upper shell 2 and will not be separated from the upper shell 2 during the sliding process; The end of the extension plate 53 is slidably provided with an L-shaped plate 54, and the bottom of the center plate 71 is provided with a bottom groove 55 adapted to the end of the L-shaped plate 54. When no calibration is required, Figure 2As shown, the locking effect of the L-shaped plate 54 and the bottom groove 55 can keep the center plate 71 in a positioned state, so that it is separated from the transmission rod 36, cam 1 12 and cam 2 13 below, avoiding movement obstruction when the transmission shaft 11 rotates; like Figure 2 As shown, it is the natural state of the valve limit switch, at this time, the driving element 7 is kept separated from the transmission shaft 11 by the action of the supporting element 5, so that when the transmission shaft 11 rotates, the cam 1 12 and the cam 2 13 will not form a movement obstacle with it, ensuring the stable use of the limit switch; When it is necessary to calibrate the cam 1 12 and the cam 2 13, the inspection cover 22 is disassembled, the positioning bolt 56 is taken out to release the limiting effect on the sliding plate 51, and then the center plate 71 is pressed down to allow the through hole 76 on the center plate to pass through the transmission rod 36, and the position of the adjustment rod 74 is adjusted to be placed in the corresponding groove 120, and the outer plate 72 is rotated and moved on the outer side of the center plate 71 to complete the position calibration of the cam 1 12 and the cam 2 13; During the position calibration of the cam 1 12 and the cam 2 13, the support element 5 will slide up and down synchronously with the center plate 71 to meet the need of adjusting the height position of the cam 1 12 or the cam 2 13 through the height slot 440. Fig.12 As shown, the L-shaped plate 54 and the bottom groove 55 are in a snap-fitting state, so that the support element 5 can move synchronously with the center disk 71 without external force, and during the rotation of the outer disk 72, the center disk 71 is connected by the L-shaped plate 54 and will not rotate in the axial horizontal direction. At the same time, since the center disk 71 and the locking platform 32 form a limited state through the transmission rod 36, it is ensured that the transmission shaft 11 will not rotate in the axial direction, so as to meet the adjustment accuracy of the cam 1 12 and the cam 2 13 during the rotation adjustment process of the adjustment rod 74 on the outer disk 72; like Fig.12 As shown, if it is necessary to increase the engagement strength between the L-shaped plate 54 and the bottom groove 55, a rubber convex ball can be added inside the bottom groove 55, so that after the L-shaped plate 54 is inserted into the bottom groove 55, the rubber convex ball will be squeezed and give the L-shaped plate 54 a counteracting resistance force, thereby increasing the strength of the L-shaped plate 54 and the bottom groove 55 in the engagement state, so that it can more stably follow the movement of the center plate 71 to achieve the calibration adjustment of the height direction of the cam 1 12 or the cam 2 13; When the adjusting member 4, cam 1 12 and cam 2 13 on the transmission shaft 11 need to be collectively removed, disassembled, repaired or replaced, there is no need to disassemble the upper shell 2 and the lower shell 1, as well as other internal components, and they can be removed independently. The specific steps are as follows; Remove the positioning bolt 56 to release the limiting effect on the supporting element 5, move the sliding plate 51 to separate it from the central plate 71, and then flip the extension plate 53 inside the sliding seat 52 to flip it upward to ensure that the supporting element 5 and other structures will not be hindered from moving when they are taken out; Then, the handle seat 712 is turned over so that the through groove 713 thereon forms a friction with the transmission rod 36, and the handle seat 712 is pressed down to drive the transmission rod 36 to move downward synchronously, so that the trapezoidal block 33 releases the lock on the transmission shaft 11, and the transmission rod 36 is engaged with the stable groove 332 through the convex buckle 360 ​​thereon, and the transmission rod 36 is moved up to complete the synchronous disassembly of the adjustment member 4, the cam 1 12 and the cam 2 13, and finally the following is formed. Figure 7 As shown; Through the above operation, the upper shell 2 and the lower shell 1 will not be affected by the internal space limitation, and the shell will not need to be destroyed as a whole. At the same time, there is no need to disassemble the components around the cam 1 12 and the cam 2 13 one by one to free up the operation space, which is convenient for actual use and subsequent maintenance and repair, and has higher practicality. A protective cylinder 6 is fixed on the inspection cover 22, and a feedback column 61 is rotatably arranged inside the protective cylinder 6. Two opposite sides of the top of the feedback column 61 have opening areas 62, and the other two opposite sides of the top of the feedback column 61 have closing areas 63. The top of the protective tube 6 has a protective cover 64, two opposite sides of the top of the protective cover 64 have transparent areas 65, and the other two opposite sides of the top of the protective cover 64 have shielding areas 66; The surface of the protective tube 6 is provided with a movable ring 67. Figure 3 One side of the protective tube 6 shown in the figure has a U-shaped connecting section, which can realize the stable connection between the upper and lower parts of the protective tube 6 of the movable ring 67 and allow the movable ring 67 to rotate with the movable ring. A conflict bolt 68 is threadedly penetrated on one side of the movable ring 67. One end of the transmission shaft 11 passes through the protective tube 6 and extends to the bottom of the feedback column 61 to be movably connected with it. The rotation of the conflict bolt 68 can make one end of it pass through the feedback column 61 and contact the surface of the transmission shaft 11, so that the transmission shaft 11 can directly drive the feedback column 61 to rotate and feedback, and the feedback of the valve state is realized by staggering the positions on the feedback column 61 and the protective cover 64. After the cam 12 and the cam 2 13 are independently calibrated, the feedback column 61 also needs to be calibrated. The specific calibration steps are: rotating the interference bolt 68 to release the interference with the transmission shaft 11, and then rotating the movable ring 67. The feedback column 61 will be driven to rotate synchronously through the action of the interference bolt 68. For example, the cam 12 just acts on the micro switch 14 to form a signal monitoring to open the valve. In the process of rotating the movable ring 67, the opening area 62 on the feedback column 61 is rotated to the corresponding transparent area 65, and then the interference bolt 68 is rotated. The bolt 68 makes one end of it contact with the surface of the feedback column 61. When the transmission shaft 11 continues to rotate, the cam 12 will separate from the micro switch 14, and the cam 2 13 will then contact the micro switch 2 15 to complete the signal monitoring of the valve closing. In this process, since the transmission shaft 11 is in a synchronous motion state with the feedback column 61 through the contact bolt 68, the closing area 63 on the feedback column 61 will rotate below the transparent area 65 to provide feedback, so as to provide feedback on the real-time monitoring of the valve status and assist outside personnel in making judgments on relevant situations. Before removing the inspection cover 22 to calibrate cam 1 12 or cam 2 13, it is necessary to first rotate the interference bolt 68 to release the interference with the transmission shaft 11, and then the inspection cover 22 will be taken out synchronously with the protective tube 6 to separate the transmission shaft 11 from the protective tube 6 and the feedback column 61.

[0026] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A feedback valve limit switch, comprising a lower housing (1) and an upper housing (2) connected to each other, wherein a transmission shaft (11) is movably provided in the lower housing (1) for connecting to an external valve control shaft, characterized in that: Also includes; Cam 1 (12) and cam 2 (13) are sequentially sleeved on the surface of the transmission shaft (11) from top to bottom; A micro switch 1 (14) and a micro switch 2 (15), which are distributed on the side wall of the lower housing (1) and are respectively adapted to be mounted on the cam 1 (12) and the cam 2 (13); An adjusting element (3) is sleeved on the surface of a transmission shaft (11) and has two sets of adjusting members (4) thereon, wherein the adjusting element (3) is connected to a corresponding cam 1 (12) and a corresponding cam 2 (13) through the adjusting members (4) thereon, and the cam 1 (12) and the cam 2 (13) are adjusted relative to the corresponding micro switch 1 (14) and the micro switch 2 (15) by the action of the adjusting members (4); The adjusting member (4) comprises a support plate (41) and an adjusting plate (42) fixed to the surface of the adjusting element (3); a support spring (43) is fixed to the surface of the support plate (41); the support spring (43) is sleeved on the surface of the adjusting element (3) and contacts the bottom of the corresponding cam 1 (12) or cam 2 (13); The surface of the adjustment disk (42) has an adjustment groove (44) for connecting and assembling with the corresponding cam 1 (12) or cam 2 (13); A driving element (7) is disposed above the adjusting element (3) and is used to press cam 1 (12) and cam 2 (13) to form a position adjustment on the adjusting element (3).

2. A feedback valve limit switch according to claim 1, characterized in that: The adjustment slot (44) comprises a height slot (440) and a horizontal slot (441); There are two height grooves (440), the two height grooves (440) are symmetrically distributed on both sides of the adjustment plate (42), and the horizontal groove (441) is arranged on one side of the height groove (440) and is in communication with the height groove (440); The horizontal grooves (441) have a plurality of groups, and the plurality of groups of horizontal grooves (441) are distributed at equal intervals on the surface of the adjustment disk (42).

3. A feedback valve limit switch according to claim 2, characterized in that: A sliding block (442) corresponding to and matching the height slot (440) is fixed on the inner side of each of the cams 1 (12) and 2 (13), and a locking block (443) is provided on the top of the sliding block (442); The height of the horizontal groove (441) is greater than the sum of the heights of the locking block (443) and the sliding block (442); The top wall of the horizontal groove (441) has a locking groove (444) for locking with a locking block (443) to lock the position of cam one (12) or cam two (13).

4. A feedback valve limit switch according to claim 1, characterized in that: The adjusting element (3) comprises a sleeve (31) sleeved on the surface of the transmission shaft (11), and the supporting disk (41) and the adjusting disk (42) are both fixed on the surface of the sleeve (31); A locking platform (32) is extended outward from the top of the sleeve (31), a trapezoidal block (33) is slidably provided inside the locking platform (32), and a trapezoidal groove (34) matching the trapezoidal block (33) is formed on the surface of the transmission shaft (11) at a position corresponding to the trapezoidal block (33); One side of the trapezoidal block (33) is connected to a locking spring (35) fixed to the side wall of the locking platform (32). The force of the locking spring (35) causes the trapezoidal block (33) to slide in the trapezoidal groove (34) to form a mutual locking between the transmission shaft (11) and the sleeve (31).

5. A feedback valve limit switch according to claim 4, characterized in that: The driving element (7) comprises a central disk (71) sleeved on the top of the transmission shaft (11) and an outer disk (72) movably sleeved on the outer side of the central disk (71); a support portion (73) is extended from one side of the outer disk (72) for connecting the adjustment rod (74) thereto; A bolt (75) for locking the height of the upper adjustment rod (74) is threadedly provided on the surface of the support portion (73); The surfaces of the cam 1 (12) and the cam 2 (13) are both provided with a groove (120) for the end of the adjusting rod (74) to be inserted.

6. A feedback valve limit switch according to claim 5, characterized in that: Transmission rods (36) are slidably provided on both sides of the top of the locking platform (32), and a through hole (76) is provided on the central disk (71) for the transmission rods (36) to pass through.

7. A feedback valve limit switch according to claim 6, characterized in that: Support columns (710) are fixed at positions close to the through holes (76) on both sides of the top of the center disk (71), a universal ball (711) is movably embedded in the top of the support column (710), and a handle seat (712) is fixedly connected to the surfaces of the two universal balls (711); Wherein, both ends of the handle seat (712) are provided with through slots (713) for the transmission rod (36) to pass through.

8. A feedback valve limit switch according to claim 7, characterized in that: The trapezoidal block (33) has a resisting inclined surface (330), a connecting groove (331) is formed in a concave shape at the end of the resisting inclined surface (330), and a stabilizing groove (332) is formed on one side wall of the connecting groove (331); A protruding buckle (360) is connected to the bottom of one side of the transmission rod (36) for connecting with the stabilizing groove (332).

9. A feedback valve limit switch according to claim 8, characterized in that: A support element (5) for supporting the driving element (7) is slidably provided on one side of the top of the upper shell (2); The supporting element (5) comprises a sliding plate (51) slidably disposed on the top of one side of the upper shell (2), a sliding seat (52) slidably disposed in the sliding plate (51), and an extension plate (53) rotatably connected to the sliding seat (52); An L-shaped plate (54) is slidably provided at the end of the extension plate (53), and a bottom groove (55) adapted to the end of the L-shaped plate (54) is provided at the bottom of the center plate (71), so that the center plate (71) can be kept in a positioned state by the locking action of the L-shaped plate (54) and the bottom groove (55); The top of the upper shell (2) is provided with an inspection slot (21), and the top of the upper shell (2) is fixed with an inspection cover (22) by means of screws for sealing and protecting the inspection slot (21).

10. A feedback valve limit switch according to claim 9, characterized in that: A protective cylinder (6) is fixed on the inspection cover (22), a feedback column (61) is rotatably provided inside the protective cylinder (6), two opposite sides of the top of the feedback column (61) are provided with opening areas (62), and the other two opposite sides of the top of the feedback column (61) are provided with closing areas (63); The top of the protective tube (6) is provided with a protective cover (64), two opposite sides of the top of the protective cover (64) are provided with transparent areas (65), and the other two opposite sides of the top of the protective cover (64) are provided with shielding areas (66); A movable ring (67) is slidably sleeved on the surface of the protective tube (6), and a conflict bolt (68) is threadedly penetrated on one side of the movable ring (67). One end of the transmission shaft (11) extends to the bottom of the feedback column (61) and is movably connected thereto. The conflict bolt (68) can be rotated to allow one end of the conflict bolt to pass through the feedback column (61) and come into contact with the surface of the transmission shaft (11), so that the transmission shaft (11) can directly drive the feedback column (61) to rotate and feedback.

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