Anti-maloperation LVDT connection structure

Abstract

The present invention discloses an anti-misoperation LVDT connection structure, comprising an LVDT housing, the bottom end of the LVDT housing being mounted on a valve body housing through a pressure measuring anti-loosening device, a valve adjusting movable connecting plate being arranged on the upper part of the LVDT housing, one end of the valve adjusting movable connecting plate being connected to the outer wall of a valve stem through a negative pressure self-locking device, and the other end being arranged vertically and having a movable rod with a bottom end penetrating the valve adjusting movable connecting plate and extending into the LVDT housing, a contact detection device being arranged on the upper surface of the valve adjusting movable connecting plate and directly above the movable rod, and anti-loosening components being arranged on the top and bottom of the valve adjusting movable connecting plate; the contact detection device comprising a top plate, a card block arranged at the bottom of the top plate, an extension component at the top and used to give a vertical downward pressure to the card block, a contact switch embedded at the bottom of the card block, and a limit component slidably connected to the bottom of the top plate and used to limit the card block. The present invention is a connection structure that is convenient for detecting the looseness of the installation of the LVDT and can prevent the valve from misoperating.

Description

Technical Field

[0001] The invention mainly relates to the technical field of LVDT displacement sensors, in particular to an anti-misoperation LVDT connection structure. Background Art

[0002] LVDT is the abbreviation of Linear Variable Differential Transformer, which is a linear displacement sensor. It is usually used to measure the opening of the valve. During normal operation, due to the influence of the working environment, the LVDT itself may become loose, causing the LVDT to be out of sync with the actual valve opening. It may even cause the valve to malfunction due to the loose LVDT, seriously affecting the safety of the system.

[0003] According to the LVDT displacement sensor anti-breaking wire lead structure provided in the patent document with application number CN201410524871.3, the product includes a rear end cover and a bobbin, and is characterized in that: on the outer cylindrical surface of the rear end cover, on the left side of the coil retaining ring, there is an anti-breaking wire retaining ring with the same size as the coil retaining ring, and on the outer circumference of the anti-breaking wire retaining ring, there are 5 anti-breaking wire retaining ring lead grooves evenly distributed along the circumference. The product avoids the occurrence of wire breaking failures during use and ensures the reliability of the LVDT displacement sensor.

[0004] The product in the above patent avoids the occurrence of disconnection failure during use and ensures the reliability of the LVDT displacement sensor, but it is not convenient to detect the looseness of the LVDT installation. Summary of the invention

[0005] The present invention mainly provides an anti-malfunction LVDT connection structure to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] The anti-malfunction LVDT connection structure comprises an LVDT housing, the bottom end of which is mounted on the valve body housing through a pressure measuring anti-loosening device, a valve regulating movable connecting plate is arranged on the upper part of the LVDT housing, one end of the valve regulating movable connecting plate is connected to the outer wall of the valve stem through a negative pressure self-locking device, and the other end is provided with a vertically arranged movable rod whose bottom end passes through the valve regulating movable connecting plate and extends into the LVDT housing, a contact detection device is arranged on the upper surface of the valve regulating movable connecting plate and directly above the movable rod, and anti-loosening components are arranged on the top and bottom of the valve regulating movable connecting plate to prevent the movable rod from loosening;

[0008] The pressure measuring and anti-loosening device comprises an “X”-shaped bracket arranged on the valve body shell, a stepped hole passing through the top of the “X”-shaped bracket, a lifting component arranged on the valve body shell, a pressure measuring component arranged at the execution end of the lifting component and located in the stepped hole, and a pressing component sleeved on the bottom of the side wall of the LVDT shell, wherein the pressing component is used to press the bottom of the LVDT shell to the upper surface of the pressure measuring component;

[0009] The contact detection device includes a top plate which is horizontally arranged and one end of which is connected to the upper surface of the valve movable connecting plate through a fixing rod, a card block arranged at the bottom of the top plate, an extension component at the top for applying vertical downward pressure to the card block, a contact switch embedded in the bottom of the card block, and a limiting component which is slidably connected to the bottom of the top plate and is used to limit the card block.

[0010] Preferably, the lifting component includes a base tube whose bottom is connected to the valve body shell, a square block slidably connected to the inner wall of the base tube, a lifting tube whose bottom end is connected to the square block and whose top extends to the outside of the base tube, and a driving ring rotatably connected to the top of the base tube and whose inner wall is threadedly connected to the outer wall of the lifting tube. In this preferred embodiment, the lifting component facilitates the pressure measuring component to be pressed into the stepped hole at the top of the "X"-shaped bracket.

[0011] Preferably, the pressure measuring component comprises a pressure sensor disposed at the top of the lifting tube, and the pressure sensor is annular. In this preferred embodiment, the pressure measuring component is used to facilitate detection of looseness of any one of the X-shaped bracket and the LVDT housing.

[0012] Preferably, the clamping component includes an annular outer cover plate sleeved on the outer wall of the LVDT housing and connected to the upper surface of the cross-shaped bracket at the bottom, a pressure ring sleeved on the outer wall of the LVDT housing and located on the inner wall of the annular outer cover plate, and a plurality of pressure rods provided on the outer wall of the annular outer cover plate and having their bottom ends passing through the annular outer cover plate and rotatably connected to the upper surface of the pressure ring, and the side walls of the pressure rods are threadedly connected to the annular outer cover plate. In this preferred embodiment, the clamping component facilitates the bottom of the LVDT housing to be pressed against the upper surface of the pressure measuring component.

[0013] Preferably, the extension component includes an outer cover tube disposed on the top of the top plate, a guide column rod disposed on the top of the inner wall of the outer cover tube, an extension tube with a top end sleeved on the outer wall of the guide column rod and a bottom portion penetrating the upper surface of the top plate connection block, and a first spring sleeved on the outer wall of the guide column rod and used to apply pressure to the extension tube. In this preferred embodiment, the extension component facilitates the contact switch to be pressed against the top of the movable rod when the movable rod is loosened within a limited range.

[0014] Preferably, a distance measuring sensor is provided at the bottom of the inner wall of the extension tube. In this preferred embodiment, the distance measuring sensor facilitates correction of displacement error when the movable rod is loosened within a limited range.

[0015] Preferably, the limiting component includes a slide groove symmetrically arranged at the bottom of the top plate, a U-shaped limiting frame slidably connected to the slide groove, and a through groove penetrating the U-shaped limiting frame and allowing the movable rod to pass through. In this preferred embodiment, the limiting component is used to facilitate adjustment of the limited loose range of the movable rod.

[0016] Preferably, the negative pressure self-locking device comprises a semicircular groove provided at the end of the valve adjusting movable connecting plate, and a semicircular clip having two ends connected to the ends of the valve adjusting movable connecting plate by locking screws. In this preferred embodiment, the negative pressure self-locking device facilitates the valve adjusting movable connecting plate to stably connect to the valve stem.

[0017] Preferably, a plurality of negative pressure components are provided on one side of the semicircular clip, and the negative pressure components include a pressure tube provided on one side of the semicircular clip away from the valve adjustment movable connecting plate, a pressure groove on the other side, a plunger plate provided in the pressure groove, a connecting rod with one end connected to the plunger plate and the other end passing through the semicircular clip and the pressure tube in sequence and extending to the outside, a pressure plate sleeved on the outer wall of the connecting rod and located in the pressure tube, and a second spring sleeved on the outer wall of the connecting rod and located between the pressure plate and the semicircular clip, and the ends of the plurality of connecting rods are connected to elastic pressure sheets. In this preferred embodiment, negative pressure fixation of the negative pressure self-locking device is achieved by the negative pressure component to achieve secondary reinforcement.

[0018] Preferably, the anti-loosening component comprises a fixing nut, a third spring and a gasket which are sleeved on the outer wall of the movable rod and arranged in sequence from top to bottom, the fixing nut is threadedly connected to the outer wall of the movable rod, and the bottom of the gasket contacts the upper surface of the valve adjustment movable connecting plate. In this preferred embodiment, the possibility of loosening of the movable rod can be reduced or slowed down by the anti-loosening component.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The connection structure of the present invention facilitates the detection of loose installation of the LVDT;

[0021] The possibility of loosening of the movable rod can be reduced or slowed down by the anti-loosening component, the valve adjusting movable connecting plate can be stably connected to the valve stem by the negative pressure self-locking device, the negative pressure self-locking device can be negatively fixed by the negative pressure component to achieve secondary reinforcement, the lifting component can press the pressure measuring component into the stepped hole at the top of the "X"-shaped bracket, the pressing component can press the bottom of the LVDT housing to the upper surface of the pressure measuring component, the pressure measuring component can detect the looseness of any one of the "X"-shaped bracket and the LVDT housing, the extension component can press the contact switch to the top of the movable rod when the movable rod is loose within a limited range, the distance measuring sensor can correct the displacement error when the movable rod is loose within a limited range, and the limit component can adjust the limited loosening range of the movable rod.

[0022] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an axonometric diagram of the overall structure of the present invention;

[0024] Figure 2 It is an exploded view of the overall structure of the present invention;

[0025] Figure 3 It is an exploded view of the contact detection device structure of the present invention;

[0026] Figure 4 It is an exploded view of the structure of the pressure measuring and anti-loosening device of the present invention;

[0027] Figure 5 It is a top view of the overall structure of the present invention;

[0028] Figure 6 It is a side view of the overall structure of the present invention;

[0029] Figure 7 It is a cross-sectional view of the overall structure of the present invention;

[0030] Figure 8 It is an enlarged view of the structure at A of the present invention;

[0031] Fig. 9 It is an enlarged view of the structure at B of the present invention.

[0032] Description of the drawings: 10, LVDT housing; 20, pressure measurement and anti-loosening device; 21, "X"-shaped bracket; 211, stepped hole; 22, lifting component; 221, base tube; 222, square block; 223, lifting tube; 224, driving ring; 23, pressure measurement component; 231, pressure sensor; 24, pressing component; 241, annular outer cover plate; 242, pressure ring; 243, pressure rod; 30, valve adjustment movable connecting plate; 31, movable rod; 32, anti-loosening component; 321, fixing nut; 322, third spring; 323, gasket; 40, negative pressure self-locking device; 41, semi- Circular groove; 42, locking screw; 43, semicircular clip; 44, negative pressure component; 441, pressure tube; 442, pressure groove; 443, plunger plate; 444, connecting rod; 445, pressure plate; 446, second spring; 447, elastic pressure piece; 50, contact detection device; 51, top plate; 52, block; 53, extension component; 531, outer cover tube; 532, guide column rod; 533, extension tube; 534, first spring; 54, contact switch; 55, limit component; 551, slide groove; 552, U-shaped limit frame; 553, through groove; 56, distance sensor. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] Please refer to the attached Figure 1 , 2As shown in Figures 4, 7 and 8, in a preferred embodiment of the present invention, an anti-malfunction LVDT connection structure includes an LVDT housing 10, the bottom end of which is mounted on the valve body housing through a pressure measuring and anti-loosening device 20, the pressure measuring and anti-loosening device 20 includes an "X"-shaped bracket 21 provided on the valve body housing, a stepped hole 211 passing through the top of the "X"-shaped bracket 21, a lifting component 22 provided on the valve body housing, a pressure measuring component 23 provided at the execution end of the lifting component 22 and located in the stepped hole 211, and a pressing component 24 sleeved on the bottom of the side wall of the LVDT housing 10, the pressing component 24 is used to press the bottom of the LVDT housing 10 to the upper surface of the pressure measuring component 23; the lifting component 22 includes a base tube 221 connected to the valve body housing at the bottom, a square block 22 slidably connected to the inner wall of the base tube 221 2, a lifting tube 223 whose bottom end is connected to the square block 222, whose top end extends to the outside of the base tube 221, and a driving ring 224 which is rotatably connected to the top of the base tube 221 and whose inner wall is threadedly connected to the outer wall of the lifting tube 223, the pressure measuring component 23 includes a pressure sensor 231 arranged on the top of the lifting tube 223, and the pressure sensor 231 is annular, the pressing component 24 includes an annular outer cover plate 241 which is sleeved on the outer wall of the LVDT housing 10 and whose bottom is connected to the upper surface of the "X"-shaped bracket 21, a pressure ring 242 which is sleeved on the outer wall of the LVDT housing 10 and located on the inner wall of the annular outer cover plate 241, and a plurality of pressure rods 243 which are arranged on the outer wall of the annular outer cover plate 241 and whose bottom ends penetrate the annular outer cover plate 241 and are rotatably connected to the upper surface of the pressure ring 242, and the side wall of the pressure rod 243 is threadedly connected to the annular outer cover plate 241.

[0037] It should be noted that, in the present embodiment, when the LVDT housing 10 is installed, the I-shaped bracket 21 and the base tube 221 are fixed to the valve body housing by screws, the drive ring 224 is rotated, and the inner wall of the drive ring 224 drives the lifting tube 223 to move upward through the thread, so that the top of the lifting tube 223 contacts the bottom of the stepped hole 211 and the pressure sensor 231 is located on the inner wall of the stepped hole 211, the annular outer cover plate 241 is fixed to the upper surface of the I-shaped bracket 21 by screws, the pressure rod 243 is rotated, and the pressure rod 243 drives the pressure ring 242 to descend, so that the bottom of the LVDT housing 10 is pressed against the upper surface of the pressure sensor 231. Any looseness of the I-shaped bracket 21 and the LVDT housing 10 will cause the value of the pressure sensor 231 to drop. The controller receives the pressure data of the pressure sensor 231 and stops the valve operation when the pressure data is less than the set value.

[0038] Please refer to the attached Figure 2 , 5As shown in Figures 6 and 9, in another preferred embodiment of the present invention, a regulating valve movable connecting plate 30 is provided on the upper part of the LVDT housing 10, one end of the regulating valve movable connecting plate 30 is connected to the outer wall of the valve stem through a negative pressure self-locking device 40, and the other end is provided with a vertically arranged movable rod 31 with a bottom end penetrating through the regulating valve movable connecting plate 30 and extending into the LVDT housing 10, the top and bottom of the regulating valve movable connecting plate 30 are provided with an anti-loosening component 32 for preventing the movable rod 31 from loosening, the anti-loosening component 32 includes a fixing nut 321, a third spring 322 and a gasket 323 which are sleeved on the outer wall of the movable rod 31 and arranged in sequence from top to bottom, the fixing nut 321 is threadedly connected to the outer wall of the movable rod 31, the bottom of the gasket 323 contacts the upper surface of the regulating valve movable connecting plate 30, and the negative pressure self-locking device 40 includes a A semicircular groove 41, and a semicircular clip 43 whose two ends are connected to the end of the regulating valve movable connecting plate 30 by locking screws 42 respectively, a plurality of negative pressure components 44 are provided on one side of the semicircular clip 43, and the negative pressure component 44 includes a pressure tube 441 arranged on the side of the semicircular clip 43 away from the regulating valve movable connecting plate 30, a pressure groove 442 on the other side, a plunger plate 443 arranged in the pressure groove 442, a connecting rod 444 with one end connected to the plunger plate 443 and the other end passing through the semicircular clip 43 and the pressure tube 441 in sequence and extending to the outside, a pressure plate 445 sleeved on the outer wall of the connecting rod 444 and located in the pressure tube 441, and a second spring 446 sleeved on the outer wall of the connecting rod 444 and located between the pressure plate 445 and the semicircular clip 43, and the ends of the plurality of connecting rods 444 are all connected to elastic pressure sheets 447.

[0039] It should be noted that, in this embodiment, when the valve movable connecting plate 30 is connected to the valve stem, the valve stem is located between the end of the valve movable connecting plate 30 and the semicircular clamping piece 43, and the locking screw 42 is locked before pushing the elastic pressure piece 447 inward to move the plunger plate 443 to discharge the air in the pressure groove 442, tighten the locking screw 42 and loosen the elastic pressure piece 447, at this time, the semicircular clamping piece 43 and the semicircular groove 41 cooperate to clamp the valve stem, and the second spring 446 gives the plunger plate 443 an outward force through the pressure plate 445, so that negative pressure is generated in the pressure groove 442 for secondary fixation;

[0040] Furthermore, when the anti-loosening component 32 is working, the fixing nut 321 in the locked state compresses the third spring 322, and the third spring 322 applies an upward force to the fixing nut 321 to prevent the fixing nut 321 from loosening;

[0041] Furthermore, when the valve stem moves up and down, it drives the movable rod 31 to move up and down in the LVDT housing 10 to perform displacement detection.

[0042] Please refer to the attached Figure 2 ,3 As shown in Figures 7 and 8, in another preferred embodiment of the present invention, a contact detection device 50 is provided on the upper surface of the door adjustment movable connecting plate 30 and directly above the movable rod 31; the contact detection device 50 includes a top plate 51 which is horizontally arranged and one end of which is connected to the upper surface of the door adjustment movable connecting plate 30 through a fixing rod, a block 52 provided at the bottom of the top plate 51, an extension component 53 at the top and used to apply vertical downward pressure to the block 52, a contact switch 54 embedded in the bottom of the block 52, and a limiting component 55 slidably connected to the bottom of the top plate 51 and used to limit the block 52, the extension component 53 includes a An outer cover tube 531 is provided at the top of the inner wall of the outer cover tube 531, a guide column rod 532 is arranged at the top of the inner wall of the outer cover tube 531, an extension tube 533 with a top end sleeved on the outer wall of the guide column rod 532 and a bottom penetrating through the top plate 51 to connect to the upper surface of the block 52, and a first spring 534 sleeved on the outer wall of the guide column rod 532 and used to apply pressure to the extension tube 533, a distance measuring sensor 56 is provided at the bottom of the inner wall of the extension tube 533, and the limiting component 55 includes a slide groove 551 symmetrically arranged at the bottom of the top plate 51, a U-shaped limiting frame 552 slidably connected to the slide groove 551, and a through groove 553 penetrating the U-shaped limiting frame 552 and for the movable rod 31 to pass through.

[0043] It should be noted that, in this embodiment, as required, a U-shaped limit frame 552 of a suitable height is slidably installed to adjust the limited loose range of the movable rod 31. When the movable rod 31 is loose and descends within the limited range, the first spring 534 drives the extension tube 533 to move downward, and the extension tube 533 drives the block 52 to move downward, so that the contact switch 54 and the top of the movable rod 31 are kept in contact with each other. The controller receives the moving distance information of the extension tube 533 measured by the distance measuring sensor 56, and compensates the moving distance information to the valve stem linear displacement data, and the LVDT housing 10 is in a state to be repaired.

[0044] When the movable rod 31 loosens and drops beyond the limited range, the U-shaped limit frame 552 limits the block 52, the controller receives the non-contact information of the contact switch 54 and stops the driving element of the valve stem, and the LVDT housing 10 is in a state of waiting for maintenance.

[0045] The specific process of the present invention is as follows:

[0046] The controller model is "6ES7315-2EH14-0AB0", the pressure sensor 231 model is "GSS416", and the distance sensor 56 model is "WS-A164012T".

[0047] When the LVDT housing 10 is installed, the “X”-shaped bracket 21 and the base tube 221 are fixed to the valve body housing by screws, the driving ring 224 is rotated, and the inner wall of the driving ring 224 drives the lifting tube 223 to move upward through the thread, so that the top of the lifting tube 223 contacts the bottom of the stepped hole 211 and the pressure sensor 231 is located on the inner wall of the stepped hole 211, the annular outer cover plate 241 is fixed to the upper surface of the “X”-shaped bracket 21 by screws, the pressure rod 243 is rotated, and the pressure rod 243 drives the pressure ring 242 to descend, so that the bottom of the LVDT housing 10 is pressed against the upper surface of the pressure sensor 231. If any one of the “X”-shaped bracket 21 and the LVDT housing 10 is loose, the value of the pressure sensor 231 will decrease. The controller receives the pressure data of the pressure sensor 231 and stops the valve from working when the pressure data is less than the set value.

[0048] When the valve movable connecting plate 30 is connected to the valve stem, the valve stem is located between the end of the valve movable connecting plate 30 and the semicircular clamping piece 43. The locking screw 42 is locked before pushing the elastic pressure piece 447 inward to move the plunger plate 443 to discharge the air in the pressure groove 442. The locking screw 42 is tightened and the elastic pressure piece 447 is loosened. At this time, the semicircular clamping piece 43 and the semicircular groove 41 cooperate to clamp the valve stem. The second spring 446 applies a force to move the plunger plate 443 outward through the pressure plate 445, so that negative pressure is generated in the pressure groove 442 for secondary fixation.

[0049] When the anti-loosening component 32 is working, the fixing nut 321 in the locked state compresses the third spring 322, and the third spring 322 gives an upward force to the fixing nut 321 to prevent the fixing nut 321 from loosening;

[0050] When the valve stem moves up and down, it drives the movable rod 31 to move up and down in the LVDT housing 10 to perform displacement detection;

[0051] According to the needs, a U-shaped limit frame 552 of a suitable height is slidably installed to adjust the limited loose range of the movable rod 31. When the movable rod 31 is loose and descends within the limited range, the first spring 534 drives the extension tube 533 to move downward, and the extension tube 533 drives the block 52 to move downward, so that the contact switch 54 and the top of the movable rod 31 are kept in contact. The controller receives the moving distance information of the extension tube 533 measured by the distance measuring sensor 56, and compensates the moving distance information to the valve stem linear displacement data, and the LVDT housing 10 is in a state to be repaired;

[0052] When the movable rod 31 loosens and drops beyond the limited range, the U-shaped limit frame 552 limits the block 52, the controller receives the non-contact information of the contact switch 54 and stops the driving element of the valve stem, and the LVDT housing 10 is in a state of waiting for maintenance.

[0053] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An anti-malfunction LVDT connection structure, comprising an LVDT housing (10), characterized in that The bottom end of the LVDT housing (10) is mounted on the valve body housing through a pressure measuring anti-loosening device (20); a valve regulating movable connecting plate (30) is provided on the upper part of the LVDT housing (10); one end of the valve regulating movable connecting plate (30) is connected to the outer wall of the valve stem through a negative pressure self-locking device (40); the other end is provided with a vertically arranged movable rod (31) whose bottom end passes through the valve regulating movable connecting plate (30) and extends into the LVDT housing (10); a contact detection device (50) is provided on the upper surface of the valve regulating movable connecting plate (30) and directly above the movable rod (31); and anti-loosening components (32) for preventing the movable rod (31) from loosening are provided on the top and bottom of the valve regulating movable connecting plate (30); The pressure measuring and anti-loosening device (20) comprises an "X"-shaped bracket (21) arranged on the valve body shell, a stepped hole (211) penetrating the top of the "X"-shaped bracket (21), a lifting component (22) arranged on the valve body shell, a pressure measuring component (23) arranged at the execution end of the lifting component (22) and located in the stepped hole (211), and a pressing component (24) sleeved on the bottom of the side wall of the LVDT shell (10), wherein the pressing component (24) is used to press the bottom of the LVDT shell (10) to the upper surface of the pressure measuring component (23); The contact detection device (50) comprises a top plate (51) which is arranged horizontally and one end of which is connected to the upper surface of the valve adjustment movable connecting plate (30) via a fixing rod, a clamping block (52) arranged at the bottom of the top plate (51), an extension component (53) at the top and used to apply vertical downward pressure to the clamping block (52), a contact switch (54) embedded in the bottom of the clamping block (52), and a limiting component (55) which is slidably connected to the bottom of the top plate (51) and used to limit the clamping block (52).

2. The anti-malfunction LVDT connection structure according to claim 1, characterized in that: The lifting component (22) comprises a base tube (221) whose bottom is connected to the valve body shell, a square block (222) slidably connected to the inner wall of the base tube (221), a lifting tube (223) whose bottom end is connected to the square block (222) and whose top end extends to the outside of the base tube (221), and a driving ring (224) which is rotatably connected to the top of the base tube (221) and whose inner wall is threadedly connected to the outer wall of the lifting tube (223).

3. The anti-malfunction LVDT connection structure according to claim 2, characterized in that: The pressure measuring component (23) comprises a pressure sensor (231) arranged at the top of the lifting tube (223); the pressure sensor (231) is annular.

4. The anti-malfunction LVDT connection structure according to claim 1, characterized in that: The clamping component (24) includes an annular outer cover plate (241) which is sleeved on the outer wall of the LVDT housing (10) and connected to the upper surface of the I-shaped bracket (21) at the bottom, a pressure ring (242) which is sleeved on the outer wall of the LVDT housing (10) and located on the inner wall of the annular outer cover plate (241), and a plurality of pressure rods (243) which are arranged on the outer wall of the annular outer cover plate (241) and have their bottom ends passing through the annular outer cover plate (241) and rotatably connected to the upper surface of the pressure ring (242), and the side walls of the pressure rods (243) are threadedly connected to the annular outer cover plate (241).

5. The anti-malfunction LVDT connection structure according to claim 1, characterized in that: The extension component (53) comprises an outer cover tube (531) arranged on the top of the top plate (51), a guide column rod (532) arranged on the top of the inner wall of the outer cover tube (531), an extension tube (533) with a top end sleeved on the outer wall of the guide column rod (532) and a bottom penetrating through the top plate (51) and connected to the upper surface of the block (52), and a first spring (534) sleeved on the outer wall of the guide column rod (532) and used to apply pressure to the extension tube (533).

6. The anti-malfunction LVDT connection structure according to claim 5, characterized in that: A distance measuring sensor (56) is provided at the bottom of the inner wall of the extension tube (533).

7. The anti-malfunction LVDT connection structure according to claim 1, characterized in that: The limiting component (55) comprises a sliding groove (551) symmetrically arranged at the bottom of the top plate (51), a U-shaped limiting frame (552) slidably connected to the sliding groove (551), and a through groove (553) penetrating the U-shaped limiting frame (552) and allowing the movable rod (31) to pass through.

8. The anti-malfunction LVDT connection structure according to claim 1, characterized in that: The negative pressure self-locking device (40) comprises a semicircular groove (41) provided at the end of the valve adjustment movable connecting plate (30), and a semicircular clip (43) whose two ends are connected to the end of the valve adjustment movable connecting plate (30) via locking screws (42).

9. The anti-malfunction LVDT connection structure according to claim 8, characterized in that: A plurality of negative pressure components (44) are provided on one side of the semicircular clamp (43), and the negative pressure components (44) include a pressure tube (441) provided on one side of the semicircular clamp (43) away from the valve regulating movable connecting plate (30), a pressure groove (442) on the other side, a plunger plate (443) provided in the pressure groove (442), a connecting rod (444) having one end connected to the plunger plate (443) and the other end passing through the semicircular clamp (43) and the pressure tube (441) in sequence and extending to the outside, a pressure plate (445) sleeved on the outer wall of the connecting rod (444) and located in the pressure tube (441), and a second spring (446) sleeved on the outer wall of the connecting rod (444) and located between the pressure plate (445) and the semicircular clamp (43), and the ends of the plurality of connecting rods (444) are all connected to an elastic pressure plate (447).

10. The anti-malfunction LVDT connection structure according to claim 1, characterized in that: The anti-loosening component (32) comprises a fixing nut (321), a third spring (322) and a gasket (323) which are sleeved on the outer wall of the movable rod (31) and arranged in sequence from top to bottom. The fixing nut (321) is threadedly connected to the outer wall of the movable rod (31), and the bottom of the gasket (323) contacts the upper surface of the valve adjustment movable connecting plate (30).

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