Hydraulic cylinder, its working method, and piston rod displacement detection device for hydraulic cylinder.

Abstract

This invention belongs to the technical field of fluid pressure actuators, specifically relating to a hydraulic cylinder, its working method, and a piston rod displacement detection device for the hydraulic cylinder. The hydraulic cylinder includes: a cylinder body with a piston rod inserted therein; a resistance mechanism including: a linear resistor with a first conductive element and a second conductive element respectively disposed at its two ends, and a third conductive element slidably disposed in the middle of the linear resistor; a DC power supply connected to the first and second conductive elements; and a voltage measuring mechanism including: a first voltage measuring unit and a second voltage measuring unit. The first and second voltage measuring units of the hydraulic cylinder, its working method, and the piston rod displacement detection device are directly connected to the conductive elements on the linear resistor. Voltage data is collected to calculate the extension length of the piston rod. Simultaneously, the direct connection of the conductive elements ensures that the collected voltage data is not affected by magnetic field interference.

Description

Technical Field

[0001] This invention belongs to the technical field of fluid pressure actuators, specifically relating to a straight cylinder type fluid pressure actuator, and more particularly to a hydraulic cylinder and its working method, as well as a piston rod displacement detection device for the hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are commonly used actuators in hydraulic systems. They achieve the reciprocating motion of the piston rod by supplying and returning oil to the cylinder body through an oil pump. In order to achieve position control and precise operation of hydraulic cylinders, magnetostrictive displacement sensors are generally used to obtain the movement distance of the piston rod.

[0003] For example, the external magnetostrictive displacement sensor with the publication number "CN218765085U" which integrates the induction magnet into the hydraulic cylinder requires an induction magnet module to be installed inside the cylinder so that the induction magnet module moves with the piston rod to obtain the movement distance of the piston rod.

[0004] In the above solution, the built-in sensing magnet module requires changes to the internal structure of the hydraulic cylinder, which not only increases the structural size of the hydraulic cylinder but also makes inspection and maintenance difficult. At the same time, in some mining and other scenarios with strong magnetic fields, the magnetostrictive sensor is easily affected by the magnetic field, resulting in poor data accuracy.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one hydraulic cylinder, its working method, and a device for detecting the displacement of the piston rod of the hydraulic cylinder.

[0007] In a first aspect, embodiments of this disclosure provide a hydraulic cylinder, comprising: a cylinder body with a piston rod inserted thereon; a resistance mechanism, comprising: a linear resistor, with a first conductive element and a second conductive element respectively disposed at both ends of the linear resistor, and a third conductive element slidably disposed in the middle of the linear resistor; a DC power supply connected to the first conductive element and the second conductive element; and a voltage measuring mechanism, comprising: a first voltage measuring unit and a second voltage measuring unit, the first voltage measuring unit being connected to the first conductive element and the second conductive element, and the second voltage measuring unit being connected to the first conductive element and the third conductive element; wherein one end of the linear resistor is connected to the piston rod, and the third conductive element is connected to the cylinder body; during the extension and retraction of the piston rod, the linear resistor is driven to move synchronously, causing the third conductive element to slide on the linear resistor, thereby changing the distance between the first conductive element and the third conductive element.

[0008] In one optional embodiment, the resistor mechanism further includes: a slider; the linear resistor is disposed inside the slider and has a groove on its upper surface; the first conductive element and the second conductive element are respectively disposed at both ends of the groove, and the third conductive element is slidably connected to the middle of the groove.

[0009] In one optional embodiment, the side wall of the cylinder is provided with a guide rail; one end of the slider is connected to the piston rod, and the middle part of the slider is disposed on the guide rail; wherein the piston rod drives the slider to slide on the guide rail during the extension and retraction process, so that the third conductive component slides in the groove.

[0010] In one optional embodiment, the first conductive element, the second conductive element, and the third conductive element each include: a carbon brush cap, a carbon brush, and a terminal block; wherein one end of the carbon brush is in contact with a groove, the carbon brush cap is disposed on the other end of the carbon brush, and the terminal block is connected to the carbon brush cap; the first voltage measuring unit is connected to the terminal blocks of the first and second conductive elements; the second voltage measuring unit is connected to the terminal blocks of the first and third conductive elements.

[0011] In one optional embodiment, both ends of the slider are provided with pressure blocks; one pressure block is adapted to press the carbon brush cap of the first conductive element so that the carbon brush contacts the slide groove, and the other pressure block is adapted to press the carbon brush cap of the second conductive element so that the carbon brush contacts the slide groove; a mounting bracket is provided on the guide rail; the mounting bracket is adapted to limit the carbon brush cap of the third conductive element, and the carbon brush cap is provided with a spring; wherein the spring is adapted to push the carbon brush cap of the third conductive element so that the carbon brush contacts the slide groove.

[0012] Secondly, embodiments of this disclosure also provide a method for operating the hydraulic cylinder as described above, comprising: connecting a first conductive element and a second conductive element via a DC power supply; causing a third conductive element connected to the cylinder body to slide on the linear resistance between the first and second conductive elements via the extension and retraction of a piston rod; acquiring voltage data between the first and second conductive elements via a first voltage measuring unit; acquiring voltage data between the first and third conductive elements via a second voltage measuring unit; and obtaining the extension length of the piston rod via a control module based on the received voltage data acquired by the first and second voltage measuring units.

[0013] In one optional implementation, the method for obtaining the piston rod extension length by the control module based on the voltage data collected by the first voltage measuring unit and the second voltage measuring unit includes: initialization setting, i.e., obtaining the distance data between the first conductive element and the third conductive element at the minimum stroke of the piston rod based on the voltage data collected by the second voltage measuring unit at the minimum stroke and the voltage data collected by the first voltage measuring unit at the same time, and obtaining the distance data between the first conductive element and the second conductive element; real-time acquisition of the piston rod extension length, i.e., obtaining the piston rod extension length by using the voltage data collected by the first voltage measuring unit and the second voltage measuring unit at the same time received by the control module.

[0014] In one optional embodiment, in the method for obtaining the extension length of the piston rod in real time, the formula for the extension length of the piston rod is set as follows:

[0015] S = L 13 -L0=(U 13 / U 12 )×L 12 -L0;

[0016] Where S is the extension length of the piston rod, in mm; L 13 L0 represents the actual distance between the first and third conductive elements, in mm; L0 represents the distance between the first and third conductive elements when the piston rod has its minimum stroke, in mm; U 13 Real-time voltage data between the first and third conductive components acquired by the second voltage measurement unit, in units of V; U 12 The real-time voltage data between the first and second conductive components acquired by the first voltage measurement unit, in units of V; L 12 The distance between the first and second conductive components is in mm.

[0017] Thirdly, this disclosure also provides a piston rod displacement detection device for a hydraulic cylinder, comprising: a linear resistor; a first conductive element and a second conductive element, respectively disposed at both ends of the linear resistor; a third conductive element, slidably disposed on the linear resistor and located between the first conductive element and the second conductive element; a DC power supply connected to the first conductive element and the second conductive element; a first voltage measuring unit connected to the first conductive element and the second conductive element to acquire voltage data; and a second voltage measuring unit connected to the first conductive element and the third conductive element to acquire voltage data; wherein, when the third conductive element moves relative to the linear resistor, distance data between the first conductive element and the third conductive element is acquired based on the voltage data collected by the second voltage measuring unit.

[0018] In one optional embodiment, one end of the linear resistor is connected to the piston rod, and the other end is slidably disposed on a guide rail on the side wall of the cylinder; the third conductive element is disposed on the cylinder; wherein, during the extension and retraction of the piston rod, the linear resistor moves synchronously with the piston rod, so that the third conductive element slides relative to the linear resistor.

[0019] The beneficial effects of this invention are that the first voltage measuring unit and the second voltage measuring unit of the hydraulic cylinder and its working method, as well as the piston rod displacement detection device for the hydraulic cylinder, are directly connected to the conductive element on the linear resistor. By collecting voltage data, the extension length of the piston rod is calculated. At the same time, the direct connection between the conductive element and the linear resistor also ensures that the collected voltage data is not affected by the magnetic field, that is, the hydraulic cylinder has a stronger anti-interference ability to adapt to the operation of the scene with a strong magnetic field.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder provided in an embodiment of the present disclosure;

[0024] Figure 2 This is a schematic diagram of the connection structure of a DC power supply and a voltage measuring mechanism provided in an embodiment of the present disclosure;

[0025] Figure 3 A schematic diagram of the mounting structure of a linear resistor and a slider provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of the structure of a conductive element provided in an embodiment of the present disclosure;

[0027] Figure 5 A schematic diagram of the installation structure of a pressure block provided in an embodiment of this disclosure;

[0028] Figure 6A schematic diagram of the mounting structure of a mounting bracket provided in an embodiment of this disclosure;

[0029] Figure 7 This is a schematic diagram of a spring mounting structure provided in an embodiment of the present disclosure.

[0030] In the picture:

[0031] Cylinder block 1, guide rail 11, mounting bracket 12;

[0032] Piston rod 2;

[0033] 3. Resistor mechanism, 31. Linear resistor, 311. Slide groove, 32. First conductive element, 321. Carbon brush cap, 322. Carbon brush, 323. Terminal block, 324. Spring, 33. Second conductive element, 34. Third conductive element, 35. Slider, 36. Pressure block.

[0034] First voltage measurement unit 41, second voltage measurement unit 42;

[0035] DC power supply 5. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0038] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] At least one embodiment provides a hydraulic cylinder, such as Figure 1 , Figure 2As shown, it includes: a cylinder body 1 with a piston rod 2 inserted thereon; a resistor mechanism 3, which includes: a linear resistor 31, with a first conductive element 32 and a second conductive element 33 respectively disposed at both ends of the linear resistor 31, and a third conductive element 34 slidably disposed in the middle of the linear resistor 31; a DC power supply 5, connected to the first conductive element 32 and the second conductive element 33; and a voltage measuring mechanism, which includes: a first voltage measuring unit 41 and a second voltage measuring unit 42, the first voltage measuring unit 41 being connected to the first conductive element 32 and the second conductive element 33, and the second voltage measuring unit 42 being connected to the first conductive element 32 and the third conductive element 34.

[0040] Specifically, one end of the linear resistor 31 is connected to the piston rod 2, and the third conductive element 34 is disposed on the cylinder 1 and abuts against the linear resistor 31. That is, during the extension and retraction of the piston rod 2, the linear resistor 31 moves synchronously, causing the third conductive element 34 to slide on the linear resistor 31, thereby changing the distance between the first conductive element 32 and the third conductive element 34.

[0041] Specifically, the DC power supply 5 is used to energize the linear resistor 31, so that the first voltage measurement unit 41 and the second voltage measurement unit 42 can acquire voltage data.

[0042] Specifically, the voltage between any two points on the linear resistor 31 is linearly proportional to its length; as the linear resistor 31 moves synchronously with the piston rod 2, it causes a change in the distance between the first conductive element 32 and the third conductive element 34, thus reflecting the outward extension length of the piston rod 2.

[0043] Specifically, the first voltage measuring unit 41 and the second voltage measuring unit 42 may be, but are not limited to, voltmeters, and the control module may be, but is not limited to, a PLC; the control module controls the first voltage measuring unit 41 and the second voltage measuring unit 42 to collect the corresponding voltage data, and obtains the extension length of the piston rod 2 based on the collected data.

[0044] In this embodiment, the first voltage measuring unit 41 and the second voltage measuring unit 42 are directly connected to the conductive parts on the linear resistor 31. The extension length of the piston rod 2 is calculated by collecting voltage data. At the same time, the direct connection between the conductive parts and the linear resistor 31 also ensures that the collected voltage data is not affected by the magnetic field, that is, the hydraulic cylinder has a stronger anti-interference ability to adapt to the operation of the scene with a strong magnetic field.

[0045] Since the voltage of the battery in the construction machinery fluctuates when it supplies power, this embodiment sets three measurement points on the linear resistor 31: a first conductive element 32, a second conductive element 33, and a third conductive element 34. Two sets of voltage data are collected simultaneously by the first voltage measurement unit 41 and the second voltage measurement unit 42, ensuring that the data used for calculation is in the same fluctuation state.

[0046] In some embodiments, such as Figure 3 As shown, the resistor mechanism 3 also includes: a slider 35; a linear resistor 31 is disposed inside the slider 35 and has a groove 311 on its upper surface; a first conductive element 32 and a second conductive element 33 are respectively disposed at both ends of the groove 311, and a third conductive element 34 is slidably connected to the middle of the groove 311.

[0047] In this embodiment, the linear resistor 31 needs to move synchronously with the piston rod 2. In order to ensure the stability of the movement of the linear resistor 31, the linear resistor 31 is set parallel to the piston rod 2 and the two points of the linear resistor 31 are supported. In order to prevent the linear resistor 31 from being worn, the linear resistor 31 is set inside the slider 35 so that the slider 35 contacts other components.

[0048] In some embodiments, such as Figure 1 As shown, the side wall of the cylinder 1 is provided with a guide rail 11; one end of the slider 35 is connected to the piston rod 2, and the middle part of the slider 35 is provided on the guide rail 11; wherein the piston rod 2 drives the slider 35 to slide on the guide rail 11 during the extension and retraction process, so that the third conductive component 34 slides in the groove 311.

[0049] In this embodiment, the slider 35 is slidably disposed with the guide rail 11, so that the linear resistor 31 can move stably.

[0050] In some embodiments, such as Figure 4 As shown, the first conductive element 32, the second conductive element 33, and the third conductive element 34 each include: a carbon brush cap 321, a carbon brush 322, and a terminal block 323; wherein one end of the carbon brush 322 is in contact with the slide groove 311, the carbon brush cap 321 is sleeved on the other end of the carbon brush 322, and the terminal block 323 is connected to the carbon brush cap 321; the first voltage measuring unit 41 is connected to the terminal block 323 of the first conductive element 32 and the second conductive element 33; the second voltage measuring unit 42 is connected to the terminal block 323 of the first conductive element 32 and the third conductive element 34.

[0051] In this embodiment, a conductive path is formed between the linear resistor 31, the carbon brush 322, the carbon brush cap 321, and the terminal block 323.

[0052] In some embodiments, such as Figure 5 As shown, both ends of the slider 35 are provided with pressure blocks 36; one pressure block 36 is adapted to press the carbon brush cap 321 of the first conductive element 32 so that the carbon brush 322 contacts the slide groove 311, and the other pressure block 36 is adapted to press the carbon brush cap 321 of the second conductive element 33 so that the carbon brush 322 contacts the slide groove 311; as shown Figure 6 , Figure 7As shown, a mounting bracket 12 is provided on the guide rail 11; the mounting bracket 12 is adapted to limit the carbon brush cap 321 of the third conductive element 34, and a spring 324 is provided on the carbon brush cap 321; wherein the spring 324 is adapted to push the carbon brush cap 321 of the third conductive element 34 so that the carbon brush 322 contacts the slide groove 311.

[0053] Specifically, the function of the pressure block 36 is to fix the conductive components, so that the first conductive component 32 and the second conductive component 33 are in stable contact with the linear resistor 31.

[0054] Specifically, the mounting bracket 12 is used to limit the carbon brush cap 321 and carbon brush 322 of the third conductive component 34. Since the carbon brush 322 of the third conductive component 34 will wear after sliding friction with the linear resistor 31 for a long time, a spring 324 is set so that the spring 324 always pushes the carbon brush 322 to maintain stable contact with the linear resistor 31.

[0055] Specifically, both the pressure block 36 and the mounting bracket 12 have limit grooves to accommodate the end of the carbon brush cap 321, thereby preventing the carbon brush cap 321 and the carbon brush 322 from vibrating and dislodging from the limit.

[0056] At least one embodiment also provides a method for operating a hydraulic cylinder, comprising: connecting a first conductive element 32 and a second conductive element 33 via a DC power supply 5; causing a third conductive element 34 connected to the cylinder body 1 to slide on a linear resistor 31 between the first conductive element 32 and the second conductive element 33 via the extension and retraction of the piston rod 2; acquiring voltage data between the first conductive element 32 and the second conductive element 33 via a first voltage measuring unit 41; acquiring voltage data between the first conductive element 32 and the third conductive element 34 via a second voltage measuring unit 42; and obtaining the extension length of the piston rod 2 via a control module based on the received voltage data acquired by the first voltage measuring unit 41 and the second voltage measuring unit 42.

[0057] For details regarding the specific structure and implementation process of the hydraulic cylinder, please refer to the relevant discussions in the above embodiments, which will not be repeated here.

[0058] In some embodiments, the method for obtaining the extension length of the piston rod 2 by the control module based on the voltage data collected by the first voltage measuring unit 41 and the second voltage measuring unit 42 includes: initialization setting, that is, based on the voltage data collected by the second voltage measuring unit 42 at the minimum stroke and the maximum stroke of the piston rod 2, and combined with the voltage data collected by the first voltage measuring unit 41 at this time, obtaining the distance data between the first conductive element 32 and the third conductive element 34 at the minimum stroke of the piston rod 2, and obtaining the distance data between the first conductive element 32 and the second conductive element 33; real-time acquisition of the extension length of the piston rod 2, that is, obtaining the extension length of the piston rod 2 by the voltage data collected by the first voltage measuring unit 41 and the second voltage measuring unit 42 at the same time received by the control module.

[0059] In some embodiments, in the method for obtaining the extension length of the piston rod 2 in real time, the formula for the extension length of the piston rod 2 is set as follows:

[0060] S = L 13 -L0=(U 13 / U 12 )×L 12 -L0;

[0061] Where S is the extension length of piston rod 2, in mm; L 13 L0 represents the actual distance between the first conductive element 32 and the third conductive element 34, in mm; L0 represents the distance between the first conductive element 32 and the third conductive element 34 when the piston rod 2 has its minimum stroke, in mm; U 13 The real-time voltage data between the first conductive element 32 and the third conductive element 34 acquired by the second voltage measurement unit 42 is expressed in V; U 12 The real-time voltage data between the first conductive element 32 and the second conductive element 33 acquired by the first voltage measuring unit 41 is expressed in V; L 12 The distance between the first conductive element 32 and the second conductive element 33 is in mm.

[0062] Since the voltage of the battery in the construction machinery fluctuates when it supplies power, this embodiment sets three measurement points on the linear resistor 31: a first conductive element 32, a second conductive element 33, and a third conductive element 34. Two sets of voltage data are collected simultaneously by the first voltage measurement unit 41 and the second voltage measurement unit 42, ensuring that the data used for calculation is in the same fluctuation state.

[0063] In one optional implementation, a 12V DC power supply 5 is used, and the piston rod 2 has a maximum stroke of 100mm. The initialization settings are as follows:

[0064] First, the piston rod 2 is fully retracted. At this time, the extension length of the piston rod 2 is 0mm. The voltage data between the first conductive element 32 and the third conductive element 34 is collected by the second voltage measurement unit 42, for example, 2V.

[0065] Then, the piston rod 2 is fully extended, at which point the extension length of the piston rod 2 is 100mm. The voltage data between the first conductive element 32 and the third conductive element 34 is collected by the second voltage measurement unit 42, for example, 10V.

[0066] Since the voltage between any two points on the linear resistor 31 is linearly proportional to the length, the voltage change is 8V when the extension length is 100mm. The extension length corresponding to the 2V voltage when the piston rod 2 is fully retracted is 25mm. The 12V voltage between the first conductive element 32 and the second conductive element 33 corresponds to a length of 125mm.

[0067] As can be seen from the above, 125mm corresponds to the length L between the first conductive element 32 and the second conductive element 33. 13 ; 25mm corresponds to the distance L0 between the first conductive element 32 and the third conductive element 34 when the piston rod 2 has its minimum stroke.

[0068] After initialization, when calculating the real-time extension length of piston rod 2, only U needs to be collected. 13 and U 12 The voltage data is sufficient, U 12 Although it is the rated voltage of DC power supply 5, this voltage data can fluctuate due to many factors. Therefore, U is also collected. 13 and U 12 Two sets of data are used to avoid the instability of DC power supply 5 voltage affecting data accuracy.

[0069] At least one embodiment also provides a piston rod displacement detection device for a hydraulic cylinder, comprising: a linear resistor 31; a first conductive element 32 and a second conductive element 33, respectively disposed at both ends of the linear resistor 31; a third conductive element 34 slidably disposed on the linear resistor 31 and located between the first conductive element 32 and the second conductive element 33; a DC power supply 5 connected to the first conductive element 32 and the second conductive element 33; a first voltage measuring unit 41 connected to the first conductive element 32 and the second conductive element 33 to acquire voltage data; and a second voltage measuring unit 42 connected to the first conductive element 32 and the third conductive element 34 to acquire voltage data; wherein, when the third conductive element 34 moves relative to the linear resistor 31, distance data between the first conductive element 32 and the third conductive element 34 is obtained based on the voltage data collected by the second voltage measuring unit 42.

[0070] In some embodiments, one end of the linear resistor 31 is connected to the piston rod 2, and the other end is slidably disposed on the guide rail 11 on the side wall of the cylinder 1; the third conductive element 34 is disposed on the cylinder 1; wherein, during the extension and retraction of the piston rod 2, the linear resistor 31 moves synchronously with the piston rod 2 so that the third conductive element 34 slides relative to the linear resistor 31.

[0071] In summary, the first voltage measuring unit 41 and the second voltage measuring unit 42 of the hydraulic cylinder and its working method, as well as the piston rod displacement detection device for the hydraulic cylinder, are directly connected to the conductive element on the linear resistor 31. By collecting voltage data, the extension length of the piston rod 2 is calculated. At the same time, the direct connection between the conductive element and the linear resistor 31 also ensures that the collected voltage data is not affected by the magnetic field, that is, the hydraulic cylinder has a stronger anti-interference ability to adapt to the operation of the scene with strong magnetic field.

[0072] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0073] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0074] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0075] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0076] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0077] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0078] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0079] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0080] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0081] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic cylinder, characterized in that, include: A cylinder (1) with a piston rod (2) inserted thereon. The resistor mechanism (3) includes: a linear resistor (31), with a first conductive element (32) and a second conductive element (33) respectively disposed at both ends of the linear resistor (31), and a third conductive element (34) slidably disposed at the middle of the linear resistor (31). DC power supply (5) is connected to the first conductive element (32) and the second conductive element (33); A voltage measuring mechanism includes: a first voltage measuring unit (41) and a second voltage measuring unit (42), wherein the first voltage measuring unit (41) is connected to a first conductive element (32) and a second conductive element (33), and the second voltage measuring unit (42) is connected to the first conductive element (32) and a third conductive element (34); wherein One end of the linear resistor (31) is connected to the piston rod (2), and the third conductive element (34) is connected to the cylinder (1); During the extension and retraction process, the piston rod (2) drives the linear resistor (31) to move synchronously, causing the third conductive element (34) to slide on the linear resistor (31) to change the distance between the first conductive element (32) and the third conductive element (34).

2. The hydraulic cylinder as described in claim 1, characterized in that, The resistor mechanism (3) further includes: a slider (35); The linear resistor (31) is disposed inside the slider (35), and a groove (311) is provided on its upper surface. The first conductive element (32) and the second conductive element (33) are respectively disposed at both ends of the slide groove (311), and the third conductive element (34) is slidably connected to the middle part of the slide groove (311).

3. The hydraulic cylinder as described in claim 2, characterized in that, The side wall of the cylinder (1) is provided with a guide rail (11). One end of the slider (35) is connected to the piston rod (2), and the middle part of the slider (35) is set on the guide rail (11); wherein During the extension and retraction process, the piston rod (2) drives the slider (35) to slide on the guide rail (11) so that the third conductive element (34) slides in the groove (311).

4. The hydraulic cylinder as described in claim 3, characterized in that, The first conductive element (32), the second conductive element (33), and the third conductive element (34) each include: a carbon brush cap (321), a carbon brush (322), and a terminal block (323); wherein One end of the carbon brush (322) is in contact with the slide groove (311), the carbon brush cap (321) is sleeved on the other end of the carbon brush (322), and the terminal block (323) is connected to the carbon brush cap (321). The first voltage measuring unit (41) is connected to the wiring terminals (323) of the first conductive element (32) and the second conductive element (33); The second voltage measuring unit (42) is connected to the wiring terminals (323) of the first conductive element (32) and the third conductive element (34).

5. The hydraulic cylinder as described in claim 4, characterized in that, Both ends of the slider (35) are provided with pressure blocks (36); One of the pressure blocks (36) is adapted to press the carbon brush cap (321) of the first conductive element (32) so that the carbon brush (322) contacts the groove (311), and the other pressure block (36) is adapted to press the carbon brush cap (321) of the second conductive element (33) so that the carbon brush (322) contacts the groove (311); A mounting bracket (12) is provided on the guide rail (11); The mounting bracket (12) is adapted to limit the carbon brush cap (321) of the third conductive element (34), and a spring (324) is provided on the carbon brush cap (321); wherein The spring (324) is adapted to push the carbon brush cap (321) of the third conductive element (34) so ​​that the carbon brush (322) comes into contact with the groove (311).

6. A method for operating a hydraulic cylinder as described in any one of claims 1-5, characterized in that, include: The first conductive element (32) and the second conductive element (33) are connected by a DC power supply (5); The extension and retraction of the piston rod (2) causes the third conductive element (34) connected to the cylinder (1) to slide on the linear resistor (31) between the first conductive element (32) and the second conductive element (33); Voltage data between the first conductive element (32) and the second conductive element (33) is collected by the first voltage measurement unit (41); Voltage data between the first conductive element (32) and the third conductive element (34) is acquired by the second voltage measurement unit (42); The control module obtains the extension length of the piston rod (2) based on the voltage data collected by the first voltage measurement unit (41) and the second voltage measurement unit (42).

7. The working method as described in claim 6, characterized in that, The method for obtaining the extension length of the piston rod (2) by the control module based on the voltage data collected by the first voltage measuring unit (41) and the second voltage measuring unit (42) includes: Initialization settings, that is, based on the voltage data collected by the second voltage measurement unit (42) when the piston rod (2) is at its minimum and maximum stroke, and combined with the voltage data collected by the first voltage measurement unit (41) at this time, obtain the distance data between the first conductive element (32) and the third conductive element (34) when the piston rod (2) is at its minimum stroke, and obtain the distance data between the first conductive element (32) and the second conductive element (33); The extension length of the piston rod (2) is obtained in real time, that is, the extension length of the piston rod (2) is obtained by receiving voltage data collected by the first voltage measurement unit (41) and the second voltage measurement unit (42) at the same time through the control module.

8. The working method as described in claim 7, characterized in that, In the method for obtaining the extension length of the piston rod (2) in real time, the formula for the extension length of the piston rod (2) is set as follows: ； in, S The extension length of the piston rod (2) is in mm; L 13 The actual distance between the first conductive element (32) and the third conductive element (34) is in mm; L 0 The distance between the first conductive element (32) and the third conductive element (34) when the piston rod (2) is at its minimum stroke is measured in mm. U 13 The real-time voltage data between the first conductive element (32) and the third conductive element (34) obtained by the second voltage measurement unit (42) is in V; U 12 The real-time voltage data between the first conductive element (32) and the second conductive element (33) obtained by the first voltage measurement unit (41) is in V; L 12 The distance between the first conductive element (32) and the second conductive element (33) is in mm.

9. A piston rod displacement detection device for a hydraulic cylinder, characterized in that, include: Linear resistor (31); The first conductive element (32) and the second conductive element (33) are respectively disposed at both ends of the linear resistor (31); The third conductive element (34) is slidably disposed on the linear resistor (31) and located between the first conductive element (32) and the second conductive element (33); DC power supply (5) is connected to the first conductive element (32) and the second conductive element (33); The first voltage measuring unit (41) is connected to the first conductive element (32) and the second conductive element (33) to obtain voltage data; The second voltage measuring unit (42) is connected to the first conductive element (32) and the third conductive element (34) to obtain voltage data; When the third conductive element (34) moves relative to the linear resistor (31), the distance data between the first conductive element (32) and the third conductive element (34) is obtained based on the voltage data collected by the second voltage measurement unit (42).

10. The piston rod displacement detection device for a hydraulic cylinder as described in claim 9, characterized in that, One end of the linear resistor (31) is connected to the piston rod (2), and the other end is slidably mounted on the guide rail (11) on the side wall of the cylinder (1); The third conductive element (34) is disposed on the cylinder body (1); During the extension and retraction of the piston rod (2), the linear resistor (31) moves synchronously with the piston rod (2) so that the third conductive element (34) slides relative to the linear resistor (31).

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