Hydraulic cylinder built-in displacement sensor mounting structure and hydraulic cylinder

Abstract

The utility model provides a hydraulic cylinder built-in displacement sensor installation structure and a hydraulic cylinder. The installation structure comprises a cylinder barrel, a piston arranged in the cylinder barrel, a piston rod with one end connected with the piston, a cylinder bottom and a hinge joint. The cylinder bottom plug is arranged at one end of the cylinder barrel, and the hinge joint is detachably connected with the outside of the cylinder bottom; a magnetic ring assembly is arranged in one end of the piston rod, a first stepped hole, a second stepped hole and a third stepped hole are sequentially formed in the cylinder bottom, a displacement sensor is arranged in the first stepped hole, the measuring end of the displacement sensor penetrates through the magnetic ring assembly to extend into the piston rod, and a split washer is arranged in the second stepped hole and used for abutting against the end, away from the measuring end, of the displacement sensor. A stop screw plug is detachably arranged in the third step hole and used for abutting against the split washer so that the displacement sensor can be firmly installed in the cylinder bottom. The installation difficulty of the sensor and the piston rod can be reduced, and follow-up maintenance and replacement are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a hydraulic cylinder with a built-in displacement sensor mounting structure and a hydraulic cylinder. Background Technology

[0002] In space-constrained hydraulic cylinder structures, embedded magnetostrictive displacement sensors are typically chosen for installation. However, during use, the sensor needs to be inserted through the inside of the cylinder and into the mounting hole at the bottom of the cylinder. This installation method is extremely inconvenient, especially when the cylinder length or stroke exceeds 1 meter. Due to the excessive length of the sensor probe, significant deflection occurs when the probe is placed horizontally, and the assembly of the cylinder piston rod also becomes extremely difficult. This installation method also makes sensor replacement and maintenance inconvenient in the later stages, requiring the entire hydraulic cylinder to be disassembled to remove the sensor, greatly increasing the later maintenance costs.

[0003] Therefore, there is an urgent need for a hydraulic cylinder with a built-in displacement sensor mounting structure and a hydraulic cylinder to reduce the installation difficulty of the sensor and piston rod, and to facilitate subsequent maintenance and replacement. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic cylinder with a built-in displacement sensor mounting structure and a hydraulic cylinder, aiming to solve the technical problems of difficult installation and maintenance of traditional built-in displacement sensor mounting structures.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a hydraulic cylinder built-in displacement sensor mounting structure, including a cylinder barrel, a piston disposed in the cylinder barrel, a piston rod connected at one end to the piston, a cylinder bottom, and a hinge joint;

[0006] The cylinder bottom is located at one end of the cylinder barrel, and the hinge joint is detachably connected to the outside of the cylinder bottom. A magnetic ring assembly is provided inside one end of the piston rod. A first stepped hole, a second stepped hole, and a third stepped hole are sequentially provided inside the cylinder bottom. A displacement sensor is provided in the first stepped hole, and its measuring end extends through the magnetic ring assembly into the piston rod. An open retaining ring is provided in the second stepped hole, which is used to contact the displacement sensor's end away from the measuring end. A stop screw is detachably provided in the third stepped hole, which is used to contact the open retaining ring to securely install the displacement sensor inside the cylinder bottom.

[0007] As a further improvement to the above solution, the cylinder bottom is also provided with a wire outlet hole along its radial direction. The wire outlet hole is connected to the second stepped hole so that the lead wire of the displacement sensor can be led out through the wire outlet hole.

[0008] As a further improvement to the above scheme, the relationship between the diameters D1 of the first stepped hole, D2 of the second stepped hole, and D3 of the third stepped hole is as follows:

[0009] D1 < D2 < D3.

[0010] As a further improvement to the above solution, one end of the piston rod is provided with a first mounting hole for the magnetic ring assembly and a second mounting hole for the measuring rod of the displacement sensor to pass through.

[0011] The first mounting hole and the second mounting hole are connected sequentially, and the diameter of the first mounting hole is larger than the diameter of the second mounting hole.

[0012] As a further improvement to the above solution, the magnetic ring assembly includes two magnetic ring pads and a magnetic ring body. The magnetic ring body is disposed between the two magnetic ring pads and is disposed in the first mounting hole by a retaining spring.

[0013] As a further improvement to the above solution, the cylinder bottom and one end of the cylinder barrel are connected as one piece by welding.

[0014] As a further improvement to the above solution, the open retaining ring includes a retaining ring body and an opening disposed on the retaining ring body, and the opening angle is greater than 45°.

[0015] As a further improvement to the above solution, the hinge joint is detachably connected to the outside of the cylinder bottom via a threaded pair;

[0016] A cylindrical boss is provided on the end face of the cylinder bottom near the stop screw plug end, and a sealing groove is provided on the outer wall of the cylindrical boss. Several threaded holes are also provided on the end face near the stop screw plug end; a sealing ring is provided in the sealing groove.

[0017] The hinge joint has a groove on the end face away from the hinge end that matches the cylindrical boss.

[0018] Secondly, this utility model also provides a hydraulic cylinder, including a hydraulic cylinder built-in displacement sensor mounting structure as described in the first aspect.

[0019] Because this utility model adopts the above technical solutions, the beneficial effects of this application are as follows:

[0020] This utility model provides a hydraulic cylinder with a built-in displacement sensor mounting structure. A cylinder bottom is provided at one end of the cylinder barrel, and a hinge joint is detachably connected to the outside of the cylinder bottom. A magnetic ring assembly is provided inside one end of the piston rod. The displacement sensor is placed inside the cylinder bottom, and three stepped holes are sequentially provided inside the cylinder bottom. The displacement sensor is placed in the first stepped hole, and its measuring end extends through the magnetic ring assembly into the piston rod. An open retaining ring provided in the second stepped hole positions the displacement sensor in the first stepped hole. The open design facilitates the lead-out of the wires on the displacement sensor through the opening, and then... A stop screw plug is detachably installed inside the stepped hole. The stop screw plug contacts the open retaining ring to firmly install the displacement sensor inside the cylinder bottom. With this configuration, during installation, it is only necessary to install the magnetic ring assembly inside one end of the piston rod and assemble it with the piston inside the cylinder. Then, the displacement sensor is passed from the third stepped hole to the first stepped hole so that the displacement sensor body is placed inside the first stepped hole. Its measuring rod passes through the magnetic ring assembly and is placed inside the piston rod. The displacement sensor body is then fixed inside the cylinder bottom by the open retaining ring and the stop screw plug. Finally, the hinge joint is bolted to the cylinder bottom.

[0021] During maintenance and disassembly, simply remove the hinge joint first, and then remove the stop plug to take out the displacement sensor for repair or replacement; the entire installation or disassembly process is convenient and quick, and is not limited by the cylinder length or the cylinder stroke. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a partial cross-sectional view of a hydraulic cylinder built-in displacement sensor mounting structure disclosed in this utility model, which is installed inside the hydraulic cylinder.

[0024] Figure 2 for Figure 1 A magnified schematic diagram of the I-axis;

[0025] Figure 3 This is a partial top view schematic diagram of a hydraulic cylinder built-in displacement sensor mounting structure disclosed in this utility model;

[0026] Figure 4 This is a right-side view of the cylinder bottom disclosed in this utility model;

[0027] Figure 5 for Figure 4 AA sectional view;

[0028] Figure 6 This is a schematic diagram of the opening retaining ring disclosed in this utility model.

[0029] Figure label:

[0030] 1. Cylinder; 2. Piston; 3. Piston rod; 31. First mounting hole; 32. Second mounting hole; 4. Cylinder bottom; 41. First step hole; 42. Second step hole; 43. Third step hole; 44. Outlet hole; 45. Cylindrical boss; 46. Sealing groove; 47. Threaded hole; 5. Hinge joint; 6. Magnetic ring assembly; 61. Magnetic ring washer; 62. Magnetic ring body; 63. Snap ring; 7. Displacement sensor; 8. Opening retaining ring; 9. Locking plug; 10. Sealing ring.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0033] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0035] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] Example 1

[0037] See Figures 1-6 This utility model provides a hydraulic cylinder built-in displacement sensor installation structure, including a cylinder barrel 1, a piston 2 disposed in the cylinder barrel 1, a piston rod 3 connected to the piston 2 at one end, a cylinder bottom 4 and a hinge joint 5;

[0038] The cylinder bottom 4 is plugged at one end of the cylinder barrel 1, and the hinge joint 5 is detachably connected to the outside of the cylinder bottom 4; a magnetic ring assembly 6 is provided inside one end of the piston rod 3, and a first stepped hole 41, a second stepped hole 42 and a third stepped hole 43 are sequentially provided inside the cylinder bottom 4. A displacement sensor 7 is provided in the first stepped hole 41, and its measuring end extends through the magnetic ring assembly 6 into the piston rod 3. An open retaining ring 8 is provided in the second stepped hole 42, and the open retaining ring 8 is used to contact the displacement sensor 7 away from the measuring end. A stop screw 9 is detachably provided in the third stepped hole 43, and the stop screw 9 is used to contact the open retaining ring 8 so that the displacement sensor 7 is firmly installed in the cylinder bottom 4.

[0039] This invention features a magnetic ring assembly 6 inside one end of the piston rod 3, and a displacement sensor 7 disposed inside the cylinder bottom 4. Three stepped holes are sequentially provided inside the cylinder bottom 4. The displacement sensor 7 is disposed in the first stepped hole 41, with its measuring end extending through the magnetic ring assembly 6 into the piston rod 3. An open retaining ring 8 disposed in the second stepped hole 42 positions the displacement sensor 7 within the first stepped hole 41. The open design facilitates the routing of the wires from the displacement sensor 7. A detachable stop screw 9 is disposed in the third stepped hole 43, the stop screw 9 contacting the open... The retaining ring 8 securely mounts the displacement sensor 7 inside the cylinder bottom 4. With this configuration, during installation, it is only necessary to mount the magnetic ring assembly 6 inside one end of the piston rod 3 and assemble it with the piston 2 inside the cylinder 1. Then, the displacement sensor 7 passes through the third step hole 43 towards the first step hole 41, placing the displacement sensor 7 body inside the first step hole 41. Its measuring rod passes through the magnetic ring assembly 6 and is placed inside the piston rod 3. The retaining ring 8 and the stop plug 9 are then used to fix the displacement sensor 7 body inside the cylinder bottom 4. Finally, the hinge joint 5 is bolted onto the cylinder bottom 4.

[0040] During maintenance and disassembly, simply remove the hinge joint 5 first, and then remove the stop screw 9 to take out the displacement sensor for repair or replacement; the entire installation or disassembly process is convenient and quick, and is not limited by the length of the cylinder 1 or the stroke of the hydraulic cylinder.

[0041] As a preferred embodiment, see Figure 2and Figure 5 The cylinder bottom 4 is also provided with a wire outlet hole 44 along its radial direction. The wire outlet hole 44 is connected to the second stepped hole 42. When installing the open retaining ring 8, the opening of the open retaining ring 8 is aligned with the wire outlet hole 44 so that the lead wire of the displacement sensor 7 can be led out through the wire outlet hole 44 to connect to an external power source.

[0042] The open retaining ring 8 not only ensures the installation and fixation of the displacement sensor 7, but also allows the lead wire of the displacement sensor 7 to be easily pulled out to the outside through the opening.

[0043] As a preferred embodiment, see Figure 5 The diameters D1 of the first stepped hole 41, D2 of the second stepped hole 42, and D3 of the third stepped hole 43 are related as follows:

[0044] D1 < D2 < D3;

[0045] The step-holes, arranged sequentially from small to large, not only ensure the stable installation of the displacement sensor 7, but also facilitate the positioning of the sensor by using the steps of each hole, making the installation and removal of the displacement sensor 7 more convenient.

[0046] As a preferred embodiment, see Figure 1 One end of the piston rod 3 is provided with a first mounting hole 31 for the magnetic ring assembly 6 and a second mounting hole 32 for the measuring rod of the displacement sensor 7 to pass through.

[0047] The first mounting hole 31 and the second mounting hole 32 are connected sequentially, and the diameter of the first mounting hole 31 is larger than the diameter of the second mounting hole 32; this arrangement forms a positioning platform between the two mounting holes to facilitate the positioning of the magnetic ring assembly 6.

[0048] As a preferred embodiment, see Figure 1 and Figure 2 The magnetic ring assembly 6 includes two magnetic ring pads 61 and a magnetic ring body 62. The magnetic ring body 62 is disposed between the two magnetic ring pads 61 and is secured in the first mounting hole 31 by a retaining spring 63. Specifically, the magnetic ring pads 61 are non-magnetic pads. During installation, one magnetic ring pad 61 is first installed in the first mounting hole 31, then the magnetic ring body 62 is placed in, and then the other magnetic ring pad 61 is installed. Finally, the magnetic ring assembly 6 is fixedly installed in the first mounting hole 31 by the retaining spring 63. During disassembly, only the retaining spring 63 needs to be removed to remove the magnetic ring body 62 from the first mounting hole 31.

[0049] In a preferred embodiment, the cylinder bottom 4 is connected to one end of the cylinder barrel 1 by welding to form an integral unit; the separate arrangement of the cylinder barrel 1 and the cylinder bottom 4 facilitates the processing of the various step holes and lead wire holes in the cylinder bottom 4 and can reduce processing costs; it also facilitates the installation of the displacement sensor 7 and the magnetic ring assembly 6. Welding the cylinder bottom 4 and the cylinder barrel 1 together increases the strength of the cylinder barrel 1.

[0050] As a preferred embodiment, see Figure 6 The opening retaining ring 8 includes a retaining ring body and an opening provided on the retaining ring body, and the opening angle is greater than 45°. The opening can prevent the lead wire of the displacement sensor 7 from interfering with the opening retaining ring 8, so that its lead wire can be easily pulled to the outside of the oil cylinder through the opening and lead wire hole for easy connection to the power supply.

[0051] As a preferred embodiment, see Figure 1 and Figure 3 The hinge joint 5 is detachably connected to the outside of the cylinder bottom 4 via a threaded pair;

[0052] A cylindrical boss 45 is provided on the end face of the cylinder bottom 4 near the stop screw plug 9, and a sealing groove 46 is provided on the outer wall of the cylindrical boss 45. A plurality of threaded holes 47 are also provided on the end face near the stop screw plug 9. A sealing ring 10 is provided in the sealing groove 46.

[0053] The hinge joint 5 has a groove on the end face away from the hinge end that matches the cylindrical boss 45.

[0054] In this embodiment, the hinge joint 5 is detachably connected to the cylinder bottom 4 by six bolts. The cylindrical boss 45 and the sealing ring 10 ensure the sealing between the hinge joint 5 and the cylinder bottom 4 to prevent water from entering from here.

[0055] Example 2

[0056] This utility model also provides a hydraulic cylinder, see [link]. Figure 1 The hydraulic cylinder includes a built-in displacement sensor mounting structure as described in the first aspect, and also includes a guide sleeve disposed at the other end of the cylinder 1, and the guide sleeve is detachably disposed at the other end of the cylinder 1, and the other end of the piston rod 3 passes through the guide sleeve; such a configuration can greatly reduce the installation difficulty of the hydraulic cylinder, and in subsequent maintenance processes, only the hinge joint 5 or the guide sleeve needs to be removed to replace and maintain the displacement sensor 7.

[0057] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A mounting structure for a displacement sensor built into a hydraulic cylinder, characterized in that, It includes a cylinder, a piston disposed inside the cylinder, a piston rod connected at one end to the piston, a cylinder bottom, and a hinge joint; The cylinder bottom is located at one end of the cylinder barrel, and the hinge joint is detachably connected to the outside of the cylinder bottom. A magnetic ring assembly is provided inside one end of the piston rod. A first stepped hole, a second stepped hole, and a third stepped hole are sequentially provided inside the cylinder bottom. A displacement sensor is provided in the first stepped hole, and its measuring end extends through the magnetic ring assembly into the piston rod. An open retaining ring is provided in the second stepped hole, which is used to contact the displacement sensor's end away from the measuring end. A stop screw is detachably provided in the third stepped hole, which is used to contact the open retaining ring to securely install the displacement sensor inside the cylinder bottom.

2. The mounting structure for a displacement sensor built into a hydraulic cylinder according to claim 1, characterized in that, The cylinder bottom is also provided with a wire outlet hole along its radial direction. The wire outlet hole is connected to the second stepped hole so that the lead wire of the displacement sensor can be led out through the wire outlet hole.

3. A hydraulic cylinder built-in displacement sensor mounting structure according to claim 1 or 2, characterized in that, The relationship between the diameters D1 of the first stepped hole, D2 of the second stepped hole, and D3 of the third stepped hole is as follows: D1 < D2 < D3.

4. A hydraulic cylinder built-in displacement sensor mounting structure according to claim 1 or 2, characterized in that, One end of the piston rod is provided with a first mounting hole for the magnetic ring assembly and a second mounting hole for the measuring rod of the displacement sensor to pass through. The first mounting hole and the second mounting hole are connected sequentially, and the diameter of the first mounting hole is larger than the diameter of the second mounting hole.

5. The mounting structure for a hydraulic cylinder with a built-in displacement sensor according to claim 4, characterized in that, The magnetic ring assembly includes two magnetic ring pads and a magnetic ring body. The magnetic ring body is disposed between the two magnetic ring pads and is secured in the first mounting hole by a snap ring.

6. A hydraulic cylinder built-in displacement sensor mounting structure according to claim 1 or 2, characterized in that, The cylinder bottom and one end of the cylinder barrel are connected as one piece by welding.

7. A hydraulic cylinder built-in displacement sensor mounting structure according to claim 1 or 2, characterized in that, The open retaining ring includes a retaining ring body and an opening disposed on the retaining ring body, and the opening angle is greater than 45°.

8. A hydraulic cylinder built-in displacement sensor mounting structure according to claim 1 or 2, characterized in that, The hinge joint is detachably connected to the outside of the cylinder bottom via a threaded pair; A cylindrical boss is provided on the end face of the cylinder bottom near the stop screw plug end, and a sealing groove is provided on the outer wall of the cylindrical boss. Several threaded holes are also provided on the end face near the stop screw plug end; a sealing ring is provided in the sealing groove. The hinge joint has a groove on the end face away from the hinge end that matches the cylindrical boss.

9. A hydraulic cylinder, characterized in that, This includes a hydraulic cylinder built-in displacement sensor mounting structure as described in any one of claims 1-8.

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