Jack with built-in cord travel sensor

Abstract

The application discloses a jack with built-in pull rope stroke sensor, which comprises a jack body, a sensor assembly and a fixing assembly. The jack body comprises a cylinder base, a cylinder barrel, an end cover and a piston assembly. The cylinder base is provided with a first mounting through hole and a wire outlet hole. The piston rod is provided with a second mounting through hole. The sensor assembly comprises a pull rope sensor and a sensor sleeve. The pull rope sensor is assembled in the first mounting through hole. The sensor sleeve is connected with the cylinder base. The sensor sleeve surrounds the pull rope sensor. A sleeve guide ring is sleeved on the sensor sleeve. There is an annular gap between the sleeve guide ring and the hole wall of the second mounting through hole. The fixing assembly is assembled in the second mounting through hole. The steel wire rope is connected with the fixing assembly. The pull rope sensor is convenient to install and maintain, and has small dismounting space. The sensor sleeve protects the steel wire rope. The sleeve guide ring and the inner wall of the piston rod form hydraulic damping, which reduces the influence of the fluctuation of liquid flow and pressure on the steel wire rope, and improves the measurement accuracy.

Description

Technical Field

[0001] This invention relates to the field of jack technology, and more particularly to a jack with a built-in pull rope travel sensor. Background Technology

[0002] Jacks are the actuators of hydraulic supports, and their extension and retraction play a crucial role in the advancement of the working face. The integrity of jacks equipped with stroke sensors is a key factor in determining the level of automation of the working face, as the stroke position of the jack determines the posture of the hydraulic support. If the sensor fails, it may at least affect the level of automation of the working face, or even lead to jack leakage, causing the hydraulic support to malfunction.

[0003] With the increasing automation of coal mines, the precision requirements for the overall operation of hydraulic supports have become higher, especially the pushing and pulling actions of the pushing jacks, which directly affect the straightness of the working face. The stroke sensor value of the pushing jack serves as a key reference value for automatic pushing and pulling. If the stroke sensor fails, the pushing jack's action cannot be accurately controlled, and the working face cannot be automatically straightened. Other support jacks, balancing jacks, etc., can only achieve automatic and precise control of the hydraulic support's posture by integrating stroke sensors and forming a closed-loop control with the electro-hydraulic controller.

[0004] In related technologies, jacks with built-in stroke sensors require complete disassembly to replace or repair the sensor if the sensor malfunctions. Furthermore, this requires a large space for disassembly and assembly, making installation and maintenance inconvenient. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, embodiments of the present invention propose a jack with a built-in rope travel sensor, which is easy to install and maintain.

[0007] The jack with a built-in draw rope stroke sensor according to an embodiment of the present invention includes: a jack body, a sensor assembly, and a fixing assembly. The jack body includes a cylinder base, a cylinder barrel, an end cap, and a piston assembly. One end of the cylinder barrel is connected to the cylinder base, and the other end of the cylinder barrel is detachably connected to the end cap. The end cap has a clearance hole. The piston assembly includes a piston and a piston rod detachably connected to the piston. The piston is slidably disposed in the cylinder barrel and defines a rodless chamber and a rod chamber in the cylinder barrel. The piston rod passes through the clearance hole. The cylinder base has a liquid inlet channel communicating with the rodless chamber, and the cylinder barrel has a liquid return channel communicating with the rod chamber. The cylinder base also has a first mounting through hole and a cable outlet hole communicating with the first mounting through hole. One end of the first mounting through hole communicates with the outside. The other end is connected to the rodless cavity. The piston rod is provided with a second mounting through hole extending along the length direction of the piston rod. The sensor assembly includes a pull rope sensor and a sensor sleeve. The pull rope sensor is assembled in the first mounting through hole. The sensor sleeve is connected to the cylinder seat. The sensor sleeve surrounds the pull rope sensor. At least a portion of the sensor sleeve is located in the second mounting through hole. A sleeve guide ring is fitted on the sensor sleeve. There is an annular gap between the outer peripheral wall of the sleeve guide ring and the hole wall of the second mounting through hole. The steel wire rope of the pull rope sensor passes through the sensor sleeve. The fixing component is assembled in the second mounting through hole. The fixing component is located at the end of the second mounting through hole away from the cylinder seat. The steel wire rope of the pull rope sensor is detachably connected to the fixing component.

[0008] The jack with a built-in draw-rope stroke sensor in this invention facilitates installation and maintenance. The sensor can be removed from the rear of the cylinder by disconnecting the wire rope from the end of the piston rod, eliminating the need for complete jack disassembly and requiring minimal space. Furthermore, the wire rope is protected by a sensor sleeve, and the sleeve guide ring protects the sensor sleeve. The sleeve guide ring and the inner wall of the piston rod form hydraulic damping, reducing the impact of fluctuations in fluid flow and pressure on the wire rope and improving the measurement accuracy of the draw-rope sensor.

[0009] In some embodiments, the wire rope of the pull rope sensor is provided with a first limiting member, the fixing component includes a fixing post and a locking block, the second mounting hole has an internal thread, the fixing post has an external thread that meshes with the internal thread, the fixing post is provided with a locking groove and a limiting groove communicating with the locking groove, the locking block is disposed in the locking groove, the locking block is provided with a limiting hole, the wire rope of the pull rope sensor passes through the limiting groove, the first limiting member is assembled in the limiting hole, and the cross-sectional area of ​​the limiting groove is smaller than the cross-sectional area of ​​the first limiting member.

[0010] In some embodiments, the wire rope of the pull rope sensor is further provided with a second limiting member, which is located between the pull rope sensor and the first limiting member.

[0011] In some embodiments, the fixing assembly further includes a plurality of first annular seals, which are spaced apart along the axial direction of the fixing post and sleeved on the fixing post, with the outer peripheral wall of the first annular seal abutting against the wall of the second mounting hole. In some embodiments, the jack body further includes a first sealing member, which is detachably connected to the cylinder seat to seal the end of the first mounting through hole that communicates with the outside.

[0012] In some embodiments, the sensor assembly further includes a sensor base, which is fitted into the first mounting through hole and located between the pull rope sensor and the first sealing member. The sensor base has a third mounting through hole, and the pull rope sensor has a wiring portion fitted into the third mounting through hole.

[0013] In some embodiments, a wiring assembly is further included, the wiring assembly including a cable head fixing seat, a cable connector, and a second sealing member. The cable head fixing seat is connected to the cylinder seat, and the cable head fixing seat is provided with a fourth mounting through hole communicating with the cable outlet hole. The cable connector is assembled at the first end of the fourth mounting through hole, the wire of the pull rope sensor is connected to the cable connector, and the second sealing member is assembled at the second end of the fourth mounting through hole.

[0014] In some embodiments, a second annular seal is provided on the end cap, and the outer peripheral wall of the second annular seal abuts against the inner peripheral wall of the cylinder.

[0015] In some embodiments, the piston assembly further includes a first combined sealing ring, a piston guide ring, a second combined sealing ring, a piston rod guide ring, and a dustproof ring. The first combined sealing ring and the piston guide ring are both sleeved on the piston, and the second combined sealing ring, the piston rod guide ring, and the dustproof ring are all disposed on the wall of the clearance hole.

[0016] In some embodiments, the cylinder seat is provided with a liquid inlet connector, the liquid inlet connector is provided with a liquid inlet hole communicating with the liquid inlet channel, and the cylinder barrel is provided with a liquid return connector, the liquid return connector is provided with a liquid return hole communicating with the liquid return channel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a jack with a built-in rope travel sensor according to an embodiment of the present invention.

[0018] Figure 2This is a schematic diagram of the pull rope sensor and fixing assembly of the jack with built-in pull rope travel sensor according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the wiring assembly of the jack with a built-in rope travel sensor according to an embodiment of the present invention.

[0020] Figure label:

[0021] Cylinder seat 1, first mounting through hole 101, cable outlet hole 102, first sealing element 103, liquid inlet connector 104.

[0022] Cylinder 2, Return connector 201

[0023] End cap 3, second annular seal 301

[0024] Piston 4, First combined seal ring 401, Piston guide ring 402

[0025] Piston rod 5, second mounting through hole 501, second combined sealing ring 502, piston rod guide ring 503, dustproof ring 504.

[0026] Sensor assembly 6, pull cord sensor 601, first limiting member 6011, second limiting member 6012, wiring part 6013, sensor sleeve 602, sleeve guide ring 6021, sensor base 603, third mounting through hole 6031.

[0027] Fixing component 7, fixing post 701, slot 7011, limiting groove 7012, locking block 702, limiting hole 7021, first annular seal 703.

[0028] Wiring assembly 8, cable head fixing base 801, fourth mounting through hole 8011, cable connector 802, second sealing component 803. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] The following describes a jack with a built-in rope travel sensor according to an embodiment of the present invention, with reference to the accompanying drawings.

[0031] like Figures 1 to 3 As shown, the jack with a built-in rope travel sensor in this embodiment of the invention includes: a jack body, a sensor assembly 6, and a fixing assembly 7.

[0032] The jack body includes a cylinder base 1, a cylinder barrel 2, an end cap 3, and a piston assembly. One end of the cylinder barrel 2 is connected to the cylinder base 1, and the other end of the cylinder barrel 2 is detachably connected to the end cap 3. Optionally, such as Figure 1 As shown, the right end face of the cylinder seat 1 has an annular groove, and the left end of the cylinder 2 is welded into the annular groove. The inner circumferential wall of the right end of the cylinder 2 has a rectangular internal thread, and the outer circumferential wall of the end cap 3 has a rectangular external thread, so that the end cap 3 is fixed to the cylinder 2 by the rectangular threads. Furthermore, the end cap 3 has a flange, the left end face of which fits against the right end face of the cylinder 2. Both the flange and the right end face of the cylinder 2 have multiple corresponding mounting holes, and multiple set screws further strengthen the connection between the end cap 3 and the cylinder 2.

[0033] The end cap 3 has a clearance hole. The piston assembly includes a piston 4 and a piston rod 5 detachably connected to the piston 4. The piston 4 is slidably disposed within the cylinder 2 and defines the cylinder 2 into a rodless chamber and a rod chamber. The piston rod 5 passes through the clearance hole. Optionally, as follows... Figure 1 As shown, piston 4 is threaded onto piston rod 5 and secured with multiple set screws to prevent piston 4 from loosening. The rodless chamber is located on the left side of piston 4, and the rod chamber is located on the right side of piston 4. O-rings and retaining rings are fitted onto piston rod 5 to seal the connection between piston rod 5 and piston 4, preventing fluid from flowing between the rod and rodless chambers.

[0034] The cylinder seat 1 is provided with an inlet channel communicating with the rodless chamber, and the cylinder barrel 2 is provided with a return channel communicating with the rod chamber. It is understandable that, as... Figure 1 As shown, the inlet channel is filled with liquid to drive piston 4 to slide to the right, and the return channel is filled with liquid to drive piston 4 to slide to the left.

[0035] The cylinder seat 1 is also provided with a first mounting through hole 101 and a cable outlet hole 102 communicating with the first mounting through hole 101. One end of the first mounting through hole 101 communicates with the outside, and the other end of the first mounting through hole 101 communicates with the rodless chamber. The piston rod 5 is provided with a second mounting through hole 501 extending along the length direction of the piston rod 5. The first mounting through hole 101 and the second mounting through hole 501 both extend in the left-right direction. The two ends of the first mounting through hole 101 extend to the left and right end faces of the cylinder seat 1, respectively, and the two ends of the second mounting through hole 501 extend to the left and right end faces of the piston rod 5, respectively.

[0036] The sensor assembly 6 includes a pull rope sensor 601 and a sensor sleeve 602. The pull rope sensor 601 is assembled in the first mounting through hole 101. The sensor sleeve 602 is connected to the cylinder seat 1 and surrounds the pull rope sensor 601. At least a portion of the sensor sleeve 602 is located in the second mounting through hole 501, and a sleeve guide ring 6021 is sleeved on the sensor sleeve 602. There is an annular gap between the outer peripheral wall of the sleeve guide ring 6021 and the hole wall of the second mounting through hole 501. The steel wire rope of the pull rope sensor 601 passes through the sensor sleeve 602.

[0037] Specifically, such as Figure 1 As shown, the right end of the pull-rope sensor 601 extends out of the first mounting through-hole 101. The sensor sleeve 602 includes a first section and a second section, with the cross-sectional area of ​​the first section being larger than that of the second section. The left end of the first section is welded to the cylinder seat 1, and the first section surrounds the pull-rope sensor 601 to protect the portion of the pull-rope sensor 601 that extends out of the first mounting through-hole 101. The right end of the first section is connected to the left end of the second section. An annular groove is provided on the outer peripheral wall of the second section, and a sleeve guide ring 6021 is disposed in the annular groove, providing guidance and support for the sensor sleeve 602.

[0038] The fixing component 7 is assembled within the second mounting through hole 501, and the fixing component 7 is located at the end of the second mounting through hole 501 away from the cylinder seat 1 (e.g. Figure 1 At the right end of the second mounting through hole 501, the wire rope of the pull rope sensor 601 is detachably connected to the fixing component 7.

[0039] Understandably, the sensor sleeve 602 serves to protect the wire rope of the pull rope sensor 601, reducing the impact of fluid flow and pressure fluctuations on the wire rope when the piston rod 5 extends and retracts. At the same time, the annular gap between the sleeve guide ring 6021 and the deep hole of the piston rod 5 acts as hydraulic damping, further reducing the impact of fluid flow and pressure fluctuations on the wire rope when the piston rod 5 extends and retracts.

[0040] If the pull rope sensor 601 malfunctions, first remove the fixing component 7 from the right end of the second mounting through hole 501 of the piston rod 5, then remove the wire rope of the pull rope sensor 601 from the fixing component 7, and finally remove the pull rope sensor 601 from the left end of the first mounting through hole 101 of the cylinder seat 1. This completes the disassembly of the pull rope sensor 601. Compared with jacks with built-in magnetostrictive sensors in related technologies, the jack with built-in pull rope stroke sensor in this embodiment of the invention is easier to disassemble and install, and can be replaced on-site if problems occur.

[0041] Therefore, the jack with a built-in draw rope stroke sensor in this embodiment of the invention, with the built-in draw rope sensor 601, is easy to install and maintain. The sensor can be removed from the tail of the cylinder seat 1 simply by removing the wire rope from the end of the piston rod 5, without needing to completely disassemble the jack, thus requiring minimal space for assembly and disassembly. Furthermore, the wire rope is protected by the sensor sleeve 602, and the sleeve guide ring 6021 protects the sensor sleeve 602. The sleeve guide ring 6021 forms hydraulic damping with the inner wall of the piston rod 5, reducing the impact of fluctuations in liquid flow and pressure on the wire rope and improving the measurement accuracy of the draw rope sensor 601.

[0042] In some embodiments, such as Figure 1 and Figure 2 As shown, the wire rope of the pull rope sensor 601 is provided with a first limiting member 6011. The fixing assembly 7 includes a fixing post 701 and a locking block 702. The second mounting hole has an internal thread, and the fixing post 701 has an external thread that meshes with the internal thread. The fixing post 701 is provided with a locking groove 7011 and a limiting groove 7012 communicating with the locking groove 7011. The locking block 702 is provided in the locking groove 7011 and has a limiting hole 7021. The wire rope of the pull rope sensor 601 passes through the limiting groove 7012. The first limiting member 6011 is assembled in the limiting hole 7021. The cross-sectional area of ​​the limiting groove 7012 is smaller than the cross-sectional area of ​​the first limiting member 6011.

[0043] Optionally, the fixing post 701 is threaded into the second mounting hole, and a hexagonal hole is also provided on the right end face of the fixing post 701 so that the operator can install the fixing post 701 into the second mounting hole using an internal hexagonal tool.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, the limiting groove 7012 is located on the left side of the slot 7011. The limiting groove 7012 is opened at the junction of the outer peripheral wall and the left end face of the fixing post 701. The slot 7011 is opened on the outer peripheral wall of the fixing post 701 and extends radially along the fixing post 701.

[0045] Understandably, the first limiting member 6011 is first assembled into the limiting hole 7021 of the locking block 702, and then the locking block 702 is locked into the locking groove 7011. After the locking block 702 and the fixing post 701 are assembled, a complete columnar structure is formed. Thus, through the action of the locking block 702 and the limiting groove 7012, the first limiting member 6011 is fixed to the right side of the limiting groove 7012, thereby realizing the detachable connection between the wire rope of the pull rope sensor 601 and the piston rod 5.

[0046] The first limiting member 6011 is a cylindrical member, which can be directly placed in the limiting hole 7021. Alternatively, an external thread is provided on the first limiting member 6011 and an internal thread is provided in the limiting hole 7021, so that the two can be connected by the threads.

[0047] In some embodiments, such as Figure 2 As shown, the fixing assembly 7 also includes a plurality of first annular seals 703, which are spaced apart on the fixing post 701 along the axial direction of the fixing post 701, and the outer peripheral wall of the first annular seal 703 abuts against the wall of the second mounting hole.

[0048] Specifically, the outer peripheral wall of the fixed column 701 is provided with two annular sealing grooves, and there are two first annular sealing elements 703. The first annular sealing element 703 includes an O-ring retainer and an O-ring. The two first annular sealing elements 703 are respectively locked in the two annular sealing grooves to form a high-pressure seal and prevent the high-pressure liquid in the rodless cavity from leaking through the second mounting through hole 501.

[0049] In some embodiments, such as Figure 1 and Figure 2 As shown, the wire rope of the pull rope sensor 601 is also provided with a second limiting member 6012, which is located between the pull rope sensor 601 and the first limiting member 6011.

[0050] Optionally, the second limiting member 6012 is located to the left of the first limiting member 6011, and the second limiting member 6012 is adjacent to the wire rope outlet of the pull rope sensor 601. In other words, the wire rope between the second limiting member 6012 and the first limiting member 6011 is an extended wire rope on the original wire rope of the pull rope sensor 601. The length of the wire rope is increased without changing the volume of the pull rope sensor 601 body, so that the length of the wire rope of the pull rope sensor 601 is greater than the stroke of the piston rod 5.

[0051] Therefore, when the piston rod 5 is fully retracted to replace the cable sensor 601, after the first limiting member 6011 is removed, the loosened wire rope will not cause a large impact on the cable sensor 601 during the retraction process under the action of the second limiting member 6012.

[0052] In some embodiments, such as Figure 1 As shown, the jack body also includes a first sealing member 103, which is detachably connected to the cylinder seat 1 to seal the end of the first mounting through hole 101 that communicates with the outside. Specifically, as shown... Figure 1 and Figure 3 As shown, the first sealing member 103 is installed in the first mounting through hole 101 by thread to seal the left end of the first mounting through hole 101, thereby preventing external impurities from entering the cylinder seat 1.

[0053] In some embodiments, such as Figure 1 and Figure 3 As shown, the sensor assembly 6 also includes a sensor base 603, which is assembled in the first mounting through hole 101. The sensor base 603 is located between the pull rope sensor 601 and the first sealing member 103. The sensor base 603 is provided with a third mounting through hole 6031. The pull rope sensor 601 has a wiring part 6013, which is assembled in the third mounting through hole 6031.

[0054] Understandably, the wires of the pull rope sensor 601 extend out of the cylinder seat 1 through the third mounting through hole 6031, the first mounting through hole 101, and the wire outlet hole 102, thereby facilitating the power supply to the pull rope sensor 601. Optionally, the sensor base 603 is cylindrical and is threaded onto the left side of the pull rope sensor 601. The wiring part 6013 is secured within the third mounting through hole 6031, and the sensor base 603 further serves to fix the pull rope sensor 601.

[0055] In some embodiments, such as Figure 3 As shown, it also includes a wiring assembly 8, which includes a cable head fixing seat 801, a cable connector 802, and a second sealing member 803. The cable head fixing seat 801 is connected to the cylinder seat 1. The cable head fixing seat 801 is provided with a fourth mounting through hole 8011 that communicates with the cable outlet hole 102. The cable connector 802 is assembled at the first end of the fourth mounting through hole 8011. The wire of the pull rope sensor 601 is connected to the cable connector 802. The second sealing member 803 is assembled at the second end of the fourth mounting through hole 8011.

[0056] Specifically, such as Figure 3 As shown, the second sealing element 803 is located at the left end of the fourth mounting through hole 8011 to prevent external impurities from entering the cylinder seat 1. The cable connector 802 is located at the right end of the fourth mounting through hole 8011. The wire of the pull rope sensor 601 enters the fourth mounting through hole 8011 through the outlet hole 102 and is connected to the cable connector 802.

[0057] In some embodiments, such as Figure 1 As shown, a second annular seal 301 (Y-ring) is fitted on the end cap 3, and the outer peripheral wall of the second annular seal 301 abuts against the inner peripheral wall of the cylinder 2.

[0058] Optionally, such as Figure 1 As shown, the end cover 3 is provided with an annular sealing groove for engaging the second annular seal 301, and the annular sealing groove is located to the left of the rectangular thread on the end cover 3. Thus, the high-pressure seal between the end cover 3 and the cylinder 2 is achieved through the second annular seal 301, preventing the leakage of high-pressure fluid in the rod cavity.

[0059] In some embodiments, such as Figure 1 As shown, the piston assembly also includes a first combined sealing ring 401, a piston guide ring 402, a second combined sealing ring 502, a piston rod guide ring 503, and a dustproof ring 504. The first combined sealing ring 401 and the piston guide ring 402 are both sleeved on the piston 4, and the second combined sealing ring 502, the piston rod guide ring 503, and the dustproof ring 504 are all disposed on the wall of the clearance hole.

[0060] The first combined sealing ring 401 and the piston guide ring 402 are respectively fitted into the annular groove 7011 opened on the piston 4. The first combined sealing ring 401 is used to prevent fluid leakage between the rod chamber and the rodless chamber. The second combined sealing ring 502, the piston rod guide ring 503, and the dustproof ring 504 are respectively set into the annular groove 7011 opened on the wall of the clearance hole. The second combined sealing ring 502 is used to prevent fluid leakage in the rod chamber, and the dustproof ring 504 is used to prevent foreign objects from entering the jack.

[0061] In some embodiments, such as Figure 1 As shown, the cylinder base 1 is provided with a liquid inlet connector 104, which has a liquid inlet hole communicating with the liquid inlet channel. The cylinder barrel 2 is provided with a liquid return connector 201, which has a liquid return hole communicating with the liquid return channel. By providing the liquid inlet connector 104 and the liquid return connector 201, it is convenient to connect the liquid inlet pipe and the liquid return pipe to the outside.

[0062] In summary, the disassembly process of the pull rope sensor 601 is described in detail below.

[0063] When disassembling the pull-rope sensor 601, first remove the first sealing component 103 and loosen the connection between the wire of the pull-rope sensor 601 and the cable connector 802. Then, use an Allen wrench to remove the fixing component 7, remove the locking block 702 from the fixing post 701, remove the first limiting component 6011 and insert it into the second mounting through hole 501 of the piston rod 5. Finally, use a socket tool to remove the sensor base 603, pull the pull-rope sensor 601 out of the first mounting through hole 101, and simultaneously pull the steel wire rope out of the second mounting through hole 501. At this point, the pull-rope sensor 601 is completely removed. Since the pull-rope sensor 601 does not require a magnetic ring and the steel wire rope is flexible, the space required for disassembly is smaller. The pull-rope sensor 601 can be removed without completely removing the piston rod 5, and the problem of the magnetic ring being difficult to replace when it malfunctions inside the piston rod 5 in related technologies is solved.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A jack with a built-in rope travel sensor, characterized in that, include: The jack body includes a cylinder base, a cylinder barrel, an end cap, and a piston assembly. One end of the cylinder barrel is connected to the cylinder base, and the other end of the cylinder barrel is detachably connected to the end cap. The end cap has a clearance hole. The piston assembly includes a piston and a piston rod detachably connected to the piston. The piston is slidably disposed in the cylinder barrel and defines a rodless chamber and a rod chamber in the cylinder barrel. The piston rod passes through the clearance hole. The cylinder base has a liquid inlet channel communicating with the rodless chamber. The cylinder barrel has a liquid return channel communicating with the rod chamber. The cylinder base also has a first mounting through hole and a cable outlet hole communicating with the first mounting through hole. One end of the first mounting through hole communicates with the outside, and the other end of the first mounting through hole communicates with the rodless chamber. The piston rod has a second mounting through hole extending along the length direction of the piston rod. A sensor assembly includes a pull-wire sensor and a sensor sleeve. The pull-wire sensor is mounted in a first mounting through hole. The sensor sleeve is connected to a cylinder seat and surrounds the pull-wire sensor. At least a portion of the sensor sleeve is located in a second mounting through hole, and a sleeve guide ring is fitted on the sensor sleeve. An annular gap exists between the outer peripheral wall of the sleeve guide ring and the wall of the second mounting through hole. The steel wire rope of the pull-wire sensor passes through the sensor sleeve. The annular gap is used to generate hydraulic damping when hydraulic oil passes through, thereby reducing the impact of fluid flow and pressure fluctuations on the steel wire rope. The sensor sleeve includes a first section and a second section. The cross-sectional area of ​​the first section is larger than that of the second section. The left end of the first section is welded to the cylinder seat and surrounds the pull-wire sensor to protect the portion of the pull-wire sensor extending out of the first mounting through hole. The right end of the first section is connected to the left end of the second section. An annular groove is provided on the outer peripheral wall of the second section, and the sleeve guide ring is located in the annular groove, providing guidance and support for the sensor sleeve. A fixing component is fitted into the second mounting through hole, the fixing component being located at the end of the second mounting through hole away from the cylinder seat, and the wire rope of the pull rope sensor is detachably connected to the fixing component.

2. The jack with a built-in rope travel sensor according to claim 1, characterized in that, The wire rope of the pull rope sensor is provided with a first limiting member. The fixing component includes a fixing post and a locking block. The second mounting through hole has an internal thread. The fixing post has an external thread that meshes with the internal thread. The fixing post is provided with a locking groove and a limiting groove communicating with the locking groove. The locking block is disposed in the locking groove and has a limiting hole. The wire rope of the pull rope sensor passes through the limiting groove. The first limiting member is assembled in the limiting hole. The cross-sectional area of ​​the limiting groove is smaller than the cross-sectional area of ​​the first limiting member.

3. The jack with a built-in rope travel sensor according to claim 2, characterized in that, The wire rope of the pull rope sensor is also provided with a second limiting member, which is located between the pull rope sensor and the first limiting member.

4. The jack with a built-in draw rope stroke sensor according to claim 2, characterized in that, The fixing assembly further includes a plurality of first annular seals, which are spaced apart on the fixing post along the axial direction of the fixing post, and the outer peripheral wall of the first annular seal abuts against the wall of the second mounting through hole.

5. The jack with a built-in draw rope stroke sensor according to claim 1, characterized in that, The jack body also includes a first sealing element, which is detachably connected to the cylinder seat to seal the end of the first mounting through hole that is connected to the outside.

6. The jack with a built-in rope travel sensor according to claim 5, characterized in that, The sensor assembly further includes a sensor base, which is fitted into the first mounting through hole. The sensor base is located between the pull rope sensor and the first sealing member. The sensor base is provided with a third mounting through hole. The pull rope sensor has a wiring part, which is fitted into the third mounting through hole.

7. The jack with a built-in rope travel sensor according to claim 1, characterized in that, It also includes a wiring assembly, which includes a cable head fixing seat, a cable connector, and a second sealing component. The cable head fixing seat is connected to the cylinder seat, and the cable head fixing seat is provided with a fourth mounting through hole communicating with the cable outlet hole. The cable connector is assembled at the first end of the fourth mounting through hole, the wire of the pull rope sensor is connected to the cable connector, and the second sealing component is assembled at the second end of the fourth mounting through hole.

8. The jack with a built-in rope travel sensor according to claim 1, characterized in that, The end cap is fitted with a second annular seal, the outer peripheral wall of which abuts against the inner peripheral wall of the cylinder.

9. The jack with a built-in draw rope stroke sensor according to claim 1, characterized in that, The piston assembly further includes a first combined sealing ring, a piston guide ring, a second combined sealing ring, a piston rod guide ring, and a dustproof ring. The first combined sealing ring and the piston guide ring are both sleeved on the piston, and the second combined sealing ring, the piston rod guide ring, and the dustproof ring are all disposed on the wall of the clearance hole.

10. The jack with a built-in draw rope stroke sensor according to claim 1, characterized in that, The cylinder seat is provided with a liquid inlet connector, which has a liquid inlet hole communicating with the liquid inlet channel. The cylinder barrel is provided with a liquid return connector, which has a liquid return hole communicating with the liquid return channel.

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