Position feedback assembly and valve cylinder

Abstract

The utility model relates to the technical field of valve position feedback, in particular to a position feedback assembly and a valve air cylinder, the position feedback assembly comprises an induction magnetic group, an electromagnetic induction switch and an adjusting back plate assembly, and the induction magnetic group is suitable for being installed on a telescopic rod for controlling the valve air cylinder; the at least two electromagnetic induction switches are located on the two sides of the induction magnetic set respectively, and the electromagnetic induction switches located on the two sides are spaced in the axial direction of the telescopic rod. The adjusting back plate assembly is connected with the electromagnetic induction switch and used for providing an adjusting space in the axial direction of the air cylinder telescopic rod and in the orthogonal direction of the axial direction for the electromagnetic induction switch. According to the utility model, the problem of inaccurate position feedback caused by short stroke of a pipeline control valve cylinder in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve position feedback, in particular to a position feedback component and a valve cylinder. Background Art

[0002] At present, the feedback device used to output the valve travel position on the general-purpose pipeline hydraulic control valve in the industrial production field is mainly a travel switch or a proximity switch. The travel switch is mainly divided into a swing arm switch or a magnetic induction switch.

[0003] Since the switching stroke of the hydraulic control valves on some pipelines on site is relatively small, the use of swing-arm switches can easily result in the situation where one side of the swing-arm switch has not yet returned to the vertical state while the other side of the swing-arm switch has already been activated, which results in the simultaneous existence of open and closed signals, and cannot accurately reflect the position status of the cylinder. Utility Model Content

[0004] In view of the above problems, the present application provides a position feedback component and a valve cylinder, which solves the problem of inaccurate position feedback caused by the short stroke of the pipeline control valve cylinder in the prior art.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the utility model provides a position feedback component, comprising:

[0007] Induction magnet group, suitable for installation on the telescopic rod of the control valve cylinder;

[0008] At least two electromagnetic induction switches are provided, which are respectively located on both sides of the induction magnetic group, and the electromagnetic induction switches located on both sides have a spacing in the axial direction of the telescopic rod;

[0009] The adjusting back plate assembly is connected to the electromagnetic induction switch and is used to provide the electromagnetic induction switch with an adjusting space along the axial direction of the cylinder telescopic rod and along the orthogonal direction of the axial direction.

[0010] According to the position feedback assembly provided by the utility model, the adjusting back plate assembly includes:

[0011] A first transverse plate having a first long hole formed along the axial direction of the telescopic rod;

[0012] The first vertical plate is provided with a second long hole along the vertical direction of the axial direction;

[0013] a first connecting member, which passes through the first vertical plate and the first long hole, and detachably connects the first horizontal plate and the first vertical plate;

[0014] A second connecting member passes through the second long hole and is connected to the electromagnetic induction switch, and is used for detachably connecting the first vertical plate to the electromagnetic induction switch.

[0015] According to the position feedback assembly provided by the utility model, the adjusting back plate assembly includes:

[0016] The second horizontal plate is provided with a third long hole along the axial direction of the telescopic rod;

[0017] The second vertical plate is provided with at least two fourth long holes parallel to each other along the vertical direction of the axial direction;

[0018] a third connecting member, which passes through the second vertical plate and the third long hole, and detachably connects the second horizontal plate and the second vertical plate;

[0019] A fourth connecting member, one end of which is slidably matched with the fourth long hole, and the other end of which is connected to the electromagnetic induction switch;

[0020] The sliding locking mechanism is disposed between the fourth connecting member and the second vertical plate, and is used to lock the sliding between the fourth connecting member and the second vertical plate.

[0021] According to the position feedback assembly provided by the utility model, the sliding locking mechanism includes:

[0022] A one-way rack is arranged along the opening direction of the fourth long hole, and part of the ratchet teeth of the one-way rack extends into the fourth long hole;

[0023] An elastic telescopic member is arranged along a direction perpendicular to the opening direction of the fourth long hole and is connected to the one-way rack so that the one-way rack can reciprocate along the setting direction of the elastic telescopic member;

[0024] A pushing assembly, connected to the one-way rack, and used to push the one-way rack to move in a direction away from the fourth long hole;

[0025] The one-way gear set is arranged on the fourth connecting member and meshes with the one-way rack.

[0026] According to the position feedback assembly provided by the utility model, the push assembly includes:

[0027] A push rod, one end of which is vertically connected to the one-way rack;

[0028] A first wedge-shaped block connected to the other end of the push rod;

[0029] The second wedge block is slidably connected to the second vertical plate, and the inclined surface end of the second wedge block cooperates with the inclined surface end of the first wedge block.

[0030] According to the position feedback assembly provided by the utility model, the induction magnetic group includes:

[0031] The brackets extend toward both sides along the radial direction of the telescopic rod;

[0032] At least two magnet bodies are provided and are respectively installed at two ends of the bracket.

[0033] In a second aspect, the utility model further provides a valve cylinder, comprising the position feedback assembly as described in the first aspect, and further comprising:

[0034] A cylinder body connected to the adjusting back plate assembly;

[0035] The telescopic rod is slidably connected to the cylinder body, and the telescopic rod is connected to the induction magnetic group.

[0036] The utility model provides a position feedback component, which improves the traditional swing arm switch into a magnetic induction type, and can realize flexible adjustment of the magnetic induction range by adjusting the setting of the back plate component, effectively solving the problem that the swing arm switch cannot accurately reflect the stroke information due to the relatively small switch stroke of the hydraulic control valve; at the same time, since the magnetic induction switch is contactless, it can reduce the mechanical wear between the induction magnetic group and the induction switch, and enhance the service life. Specifically, by setting the induction magnetic group on the telescopic rod of the control valve cylinder, it is possible to detect whether the telescopic rod switch is in place; and then to detect whether the valve switch is in place; by setting multiple electromagnetic induction switches, and respectively located on both sides of the induction magnetic group, and with a certain spacing, it is possible to realize real-time induction monitoring of the valve in two switch positions; by adjusting the setting of the back plate component, it is possible to realize flexible adjustment of the position of the electromagnetic induction switch to meet the requirements of the magnetic induction range under different strokes.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0039] Figure 1 A schematic diagram of the three-dimensional structure of a position feedback component provided in an embodiment of the present application;

[0040] Figure 2 A disassembled diagram of the first adjustable back plate assembly provided in an embodiment of the present application;

[0041] Figure 3A second disassembly diagram of an adjustable back plate assembly is provided for an embodiment of the present application;

[0042] Figure 4 A schematic diagram of the planar structure of the sliding locking mechanism provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the position of the one-way gear set provided in an embodiment of the present application;

[0044] Figure 6 A schematic diagram of a top view of the position feedback assembly provided in an embodiment of the present application;

[0045] Figure 7 A schematic diagram of the three-dimensional structure of a valve cylinder provided in an embodiment of the present application;

[0046] Figure 8 The figure is a schematic diagram of the installation position of the swing arm switch and the cylinder valve in the prior art. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] First, the existing technology is introduced:

[0050] like Figure 8 As shown, the valve stem 7 is located between the two swing arm switches 6, that is, the valve stem 7 is located between the two swing arm bodies 601, and the valve stem is installed on the telescopic rod and can reciprocate with the telescopic rod.

[0051] For valve cylinders with relatively long strokes, it is feasible to use a swing arm type travel switch or proximity switch. However, when the valve stem has a relatively short stroke, it is easy for the swing arm switch on one side to not return to the vertical state while the swing arm switch on the other side has already moved, which results in the simultaneous existence of the open and close signals, and cannot accurately reflect the position of the cylinder. In addition, the swing arm switch is susceptible to mechanical wear during the operation process, which increases the subsequent maintenance cost.

[0052] At the same time, if the swing arm switch is simply replaced with a magnetic induction switch, the relative position of the valve stem and the signal target center (sensor head) of the magnetic induction switch cannot be adjusted, resulting in a limited range of magnetic induction, and thus cannot be applied to complex application scenarios on site. It is necessary to customize the base plate to meet the actual application on site, which increases the consumption of time and manpower.

[0053] Combine the following Figures 1 to 7 The embodiment shown describes the technical solution of the utility model: wherein, Figure 1 As shown:

[0054] The embodiment of the utility model provides a position feedback component, including: an induction magnet group 2, an electromagnetic induction switch 1 and an adjustment back plate component 3, wherein the induction magnet group 2 is suitable for being installed on the telescopic rod 5 of the control valve cylinder; at least two electromagnetic induction switches 1 are provided, which are respectively located on both sides of the induction magnet group 2, and are respectively arranged symmetrically with the induction magnet group 2 as the center; the adjustment back plate component 3 is connected to the electromagnetic induction switch 1, and is used to provide the electromagnetic induction switch 1 with an adjustment space along the axial direction of the cylinder telescopic rod 5 and in the orthogonal direction along the axial direction.

[0055] The present utility model provides a position feedback component, which improves the traditional swing arm switch into a magnetic induction type, and by adjusting the setting of the back plate component 3, can realize flexible adjustment of the magnetic induction range, effectively solving the problem that the swing arm switch cannot accurately reflect the stroke information due to the relatively small switch stroke of the hydraulic control valve; at the same time, since the magnetic induction switch is contactless, it can reduce the mechanical wear between the induction magnetic group 2 and the induction switch, and enhance the service life. Specifically, by setting the induction magnetic group 2 on the telescopic rod 5 of the control valve cylinder, it is possible to detect whether the telescopic rod 5 is in place; and then to detect whether the valve switch is in place;

[0056] By setting multiple electromagnetic induction switches 1, and locating them on both sides of the induction magnetic group 2 with a certain distance between them, real-time induction monitoring of the valve in the two switch positions can be achieved; by adjusting the setting of the back plate component 3, the position of the electromagnetic induction switch 1 can be flexibly adjusted to meet the requirements of the magnetic induction range under different strokes.

[0057] According to the position feedback component provided by the embodiment of the utility model, Figure 2As shown, the adjustable back plate assembly 3 includes: a first horizontal plate 311, a first vertical plate 312, a first connecting member 315 and a second connecting member 316, wherein the first horizontal plate 311 is provided with a first long hole 313 along the axial direction of the telescopic rod 5; the first vertical plate 312 is provided with a second long hole 314 along the vertical direction of the axial direction; the first connecting member 315 penetrates the first vertical plate 312 and the first long hole 313, and detachably connects the first horizontal plate 311 and the first vertical plate 312; the second connecting member 316 penetrates the second long hole 314 and is connected to the electromagnetic induction switch 1, and is used to detachably connect the first vertical plate 312 and the electromagnetic induction switch 1.

[0058] In some embodiments, the first horizontal plate and the first vertical plate are both made of aluminum alloy and are sprayed with anti-corrosion paint. The first long hole 313 is provided with two parallel holes, and the second long hole 314 is provided in the middle of the first vertical plate 312 along the vertical direction;

[0059] The first connecting member 315 can be preferably a bolt assembly. During installation, it is only necessary to adjust the position of the first vertical plate 312 relative to the first horizontal plate 311, and then pass the bolt assembly through the mounting hole on the first vertical plate 312 and the first long hole 313 below to finally fasten the two. The second connecting member 316 can also be preferably a bolt assembly with a threaded rod. During installation, after adjusting the relative position of the first vertical plate 312 and the electromagnetic induction switch 1, the bolt assembly passes through the second long hole 314 from below and is threadedly connected to the electromagnetic induction switch 1. Specifically, the distance between the electromagnetic induction switch 1 and the telescopic rod is adjusted to 10mm-15mm, and then the fastening screws are fixed.

[0060] In this way, the first vertical plate 312 can be adjusted in the axial direction and the electromagnetic induction switch 1 can be adjusted in the radial direction, so that the position of the electromagnetic induction switch 1 relative to the induction magnetic group 2 can be changed. This not only solves the problem of inaccurate position feedback caused by the short stroke of the pipeline control valve cylinder in the prior art, but also improves the applicability of the position feedback component. For valve switches with different strokes, their positions can be adjusted arbitrarily according to needs.

[0061] According to the position feedback component provided by the embodiment of the utility model, Figure 3As shown, the adjustable back plate assembly 3 includes: a second transverse plate 321, a second vertical plate 322, a third connecting member 325, a fourth connecting member 326 and a sliding locking mechanism 327. The second transverse plate 321 is provided with a third long hole 323 along the axial direction of the telescopic rod 5; the second vertical plate 322 is provided with at least two mutually parallel fourth long holes 324 along the axial vertical direction; the third connecting member 325 penetrates the second vertical plate 322 and the third long hole 323, and detachably connects the second transverse plate 321 and the second vertical plate 322; one end of the fourth connecting member 326 is slidably matched with the fourth long hole 324, and the other end is connected to the electromagnetic induction switch 1; the sliding locking mechanism 327 is arranged between the fourth connecting member 326 and the second vertical plate 322, and is used to lock the sliding between the fourth connecting member 326 and the second vertical plate 322.

[0062] In some embodiments, two third long holes 323 are formed in parallel with each other, and two fourth long holes 324 are formed in parallel with each other along the vertical direction and are formed in the middle of the second vertical plate 322;

[0063] The third connecting member 325 is preferably a bolt assembly, and its installation method and structure are the same as those of the first connecting member 315; the fourth connecting member 326 is a threaded rod, and can penetrate the electromagnetic induction switch 1, and its upper end is fixed by a nut, and a U-shaped clamping plate 3261 is provided at the lower end, and the U-shaped clamping plate 3261 is inserted into the fourth long hole 324, and the lower end is connected to a fixing plate by bolts to prevent the U-shaped clamping plate 3261 from slipping out of the fourth long hole 324;

[0064] Since the fourth connecting member 326 needs to slide relative to the second vertical plate 322, the sliding locking mechanism 327 is disposed between the fourth connecting member 326 and the second vertical plate 322, and the sliding locking mechanism 327 can be a variety of structures, such as a top screw locking mechanism or a ratchet pawl mechanism; when the ratchet pawl mechanism is preferred:

[0065] See also Figure 4 and Figure 5 The sliding locking mechanism 327 includes: a one-way rack 3271, an elastic telescopic member 3272, a pushing assembly and a one-way tooth group 3276, wherein the one-way rack 3271 is arranged along the opening direction of the fourth long hole 324, and part of the ratchet teeth of the one-way rack 3271 extend into the fourth long hole 324; the elastic telescopic member 3272 is arranged along the opening direction perpendicular to the fourth long hole 324, and is connected to the one-way rack 3271, so that the one-way rack 3271 can reciprocate along the setting direction of the elastic telescopic member 3272; the pushing assembly is connected to the one-way rack 3271, and is used to push the one-way rack 3271 to move in a direction away from the fourth long hole 324; the one-way tooth group 3276 is arranged on the fourth connecting member 326, and is meshed with the one-way rack 3271.

[0066] In this way, compared with the above-mentioned embodiment in which position adjustment is achieved through the first connecting member 315 and the second connecting member 316, this embodiment has better automatic locking performance. When the electromagnetic induction switch 1 needs to be adjusted to a certain position, it is only necessary to push the electromagnetic induction switch 1 along the vertical surface direction of the ratchet teeth of the one-way rack 3271, or press the push assembly to unlock it and move it along the vertical surface direction away from the ratchet teeth. After moving to the target position, it is only necessary to release the push assembly.

[0067] like Figure 5 As shown, the one-way tooth set 3276 is arranged on both sides of the U-shaped clamping plate 3261 and can be engaged with the one-way rack 3271.

[0068] According to the position feedback component provided by the embodiment of the utility model, Figure 4 As shown, the push assembly includes: a push rod 3273, a first wedge block 3274 and a second wedge block 3275, wherein one end of the push rod 3273 is vertically connected to the one-way rack 3271; the first wedge block 3274 is connected to the other end of the push rod 3273; the second wedge block 3275 is slidably connected to the second vertical plate 322, and the inclined end of the second wedge block 3275 cooperates with the inclined end of the first wedge block 3274.

[0069] In some embodiments, the push rod 3273 is vertically connected to one end of the one-way rack 3271, and the push rod 3273 is penetrated by a support ring, that is, the push rod 3273 slides in the support ring; the free end of the push rod 3273 is fixedly connected to a first wedge block 3274, and a second wedge block 3275 is provided to slide vertically to the sliding direction of the push rod 3273, and the end surface of the second wedge block 3275 has two inclined surfaces, and the inclination of the inclined surfaces is the same as that of the first wedge block 3274, that is, when the second wedge block 3275 is pressed inward, the push rod 3273 will move outward, and then shrink back into the inner cavity of the second vertical plate 322 with ratchet teeth. And the second wedge block 3275 is arranged on the side of the second vertical plate 322, which can be convenient for personnel to operate, and has the advantages of saving space and being easy to operate compared with the top screw fastening mechanism. Of course, a limit plate is provided on the second wedge block 3275 to prevent it from completely detaching from the second vertical plate 322.

[0070] According to the position feedback component provided by the embodiment of the utility model, Figure 6 As shown, the induction magnetic group 2 includes: a bracket 21 and a magnet body 22, wherein the bracket 21 extends toward both sides along the radial direction of the telescopic rod 5; at least two magnet bodies 22 are provided and are respectively installed at both ends of the bracket 21.

[0071] In some embodiments, the bracket 21 includes a moving rod fixedly sleeved on the telescopic rod 5, a support rod extending to both sides is fixedly sleeved on the moving rod, and a magnet body 22 is fixedly connected to the end of the support rod. The magnet body 22 is at a certain distance from the induction head 11 on the electromagnetic induction switch 1, and the induction head 11 is not located at the center of the electromagnetic induction switch 1, but at an eccentric position, so the part shown by the dotted line in the figure indicates that there is a certain distance between the induction heads 11 of the magnetic induction switches on both sides, so as to represent the open position and the closed position.

[0072] The utility model also provides a valve cylinder, such as Figure 7 As shown, it includes the position feedback component as described above, and also includes: a cylinder body 4 and a telescopic rod 5, wherein the cylinder body 4 is connected to the adjustment back plate component 3; the telescopic rod 5 is slidably connected to the cylinder body 4, and the telescopic rod 5 is connected to the induction magnetic group 2.

[0073] The following is an overall description of the action process of the cylinder with position feedback valve:

[0074] The cylinder actuates to drive the telescopic rod to move, and the telescopic rod drives the moving rod to reciprocate within the travel range.

[0075] After the cylinder telescopic rod is opened to the full position, the moving rod is in the open position, and the magnet body 22 reaches the sensing area of ​​the target center (sensing head 11) of the magnetic induction switch. At this time, the magnetic induction switch transmits the full open position signal to the processing module;

[0076] When the telescopic rod of the cylinder is retracted, the moving rod moves to the middle position. At this time, the magnetic induction switches on both sides are in the recovery state and no signal is output.

[0077] After the cylinder telescopic rod is closed, the rod is moved to the closed position. At this time, the magnetic induction switch transmits a closed position signal to the processing module;

[0078] Since the magnetic induction switch and the adjustment backplane assembly are tightly connected, the feedback signal can be triggered or disconnected normally and stably without false operation or refusal to operate. In addition, the magnetic induction switch is a memory type, which further ensures the continuity and stability of the position signal.

[0079] The beneficial effects of the embodiments of the present application are as follows: by improving the traditional swing arm switch to a magnetic induction type, and by adjusting the setting of the back plate assembly, the magnetic induction range can be flexibly adjusted, effectively solving the problem that the swing arm switch cannot accurately reflect the stroke information due to the relatively small switch stroke of the hydraulic control valve; at the same time, since the magnetic induction switch is contactless, the mechanical wear between the induction magnetic group and the induction switch can be reduced, and the service life can be enhanced. Specifically, by setting the induction magnetic group on the telescopic rod of the control valve cylinder, the detection of the telescopic rod switch in place can be realized; and then the detection of the valve switch in place can be realized; by setting multiple electromagnetic induction switches, and respectively located on both sides of the induction magnetic group, and with a certain spacing, real-time induction monitoring of the valve in two switch positions can be realized; by adjusting the setting of the back plate assembly, the position of the electromagnetic induction switch can be flexibly adjusted to meet the requirements of the magnetic induction range under different strokes.

[0080] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and methods can be implemented in other ways. For example, the module embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, modules or units, which can be electrical, mechanical or other forms.

[0081] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A position feedback component, characterized in that: include: Induction magnet group, suitable for installation on the telescopic rod of the control valve cylinder; At least two electromagnetic induction switches are provided, which are respectively located on both sides of the induction magnetic group, and the electromagnetic induction switches located on both sides have a spacing in the axial direction of the telescopic rod; The adjusting back plate assembly is connected to the electromagnetic induction switch and is used to provide the electromagnetic induction switch with an adjusting space along the axial direction of the cylinder telescopic rod and along the orthogonal direction of the axial direction.

2. The position feedback assembly according to claim 1, characterized in that: The adjusting back plate assembly comprises: A first transverse plate having a first long hole formed along the axial direction of the telescopic rod; The first vertical plate is provided with a second long hole along the vertical direction of the axial direction; A first connecting member, which passes through the first vertical plate and the first long hole, and detachably connects the first horizontal plate and the first vertical plate; A second connecting member passes through the second long hole and is connected to the electromagnetic induction switch, and is used for detachably connecting the first vertical plate to the electromagnetic induction switch.

3. The position feedback assembly according to claim 1, characterized in that: The adjusting back plate assembly comprises: The second horizontal plate is provided with a third long hole along the axial direction of the telescopic rod; The second vertical plate is provided with at least two fourth long holes parallel to each other along the vertical direction of the axial direction; a third connecting member, which passes through the second vertical plate and the third long hole, and detachably connects the second horizontal plate and the second vertical plate; A fourth connecting member, one end of which is slidably matched with the fourth long hole, and the other end of which is connected to the electromagnetic induction switch; The sliding locking mechanism is disposed between the fourth connecting member and the second vertical plate, and is used to lock the sliding between the fourth connecting member and the second vertical plate.

4. The position feedback assembly according to claim 3, characterized in that: The sliding locking mechanism comprises: A one-way rack is arranged along the opening direction of the fourth long hole, and part of the ratchet teeth of the one-way rack extends into the fourth long hole; An elastic telescopic member is arranged along a direction perpendicular to the opening direction of the fourth long hole and is connected to the one-way rack so that the one-way rack can reciprocate along the setting direction of the elastic telescopic member; A pushing assembly connected to the one-way rack and used for pushing the one-way rack to move in a direction away from the fourth long hole; The one-way gear set is arranged on the fourth connecting member and meshes with the one-way rack.

5. The position feedback assembly according to claim 4, characterized in that: The push assembly comprises: A push rod, one end of which is vertically connected to the one-way rack; A first wedge-shaped block connected to the other end of the push rod; The second wedge block is slidably connected to the second vertical plate, and the inclined surface end of the second wedge block cooperates with the inclined surface end of the first wedge block.

6. The position feedback assembly according to claim 1, characterized in that: The induction magnetic group comprises: The brackets extend toward both sides along the radial direction of the telescopic rod; At least two magnet bodies are provided and are respectively installed at two ends of the bracket.

7. A valve cylinder, characterized in that: The method comprises a position feedback component as claimed in any one of claims 1 to 6, further comprising: A cylinder body connected to the adjusting back plate assembly; A telescopic rod is slidably connected to the cylinder body, and the telescopic rod is connected to the induction magnetic group.

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