A new type of hydraulic cylinder with built-in sensor

Abstract

The utility model provides a novel built -in sensor hydraulic cylinder, including cylinder body, displacement sensor and sensor baffle, the cylinder bottom of cylinder body is equipped with the sensor installation groove of echelon, displacement sensor installs in the middle step of sensor installation groove, sensor baffle installs in the high step of sensor installation groove, sensor baffle is used for fixing displacement sensor in cylinder bottom. The cylinder bottom end face of hydraulic cylinder of the application is provided with the sensor installation groove of echelon, installs displacement sensor in the middle step of sensor installation groove, sensor baffle installs in the high step of sensor installation groove, can make sensor baffle can pass through the echelon's step high and low difference, effectively fixes displacement sensor in sensor installation groove, prevents displacement sensor loose, falls off.

Description

Technical Field

[0001] This utility model relates to a hydraulic cylinder structure, specifically, to a novel hydraulic cylinder with a built-in sensor. Background Technology

[0002] In modern industry, hydraulic cylinders, as key power actuators, are widely used in CNC machine tools, automated production lines, lifting equipment, coal mining machinery, and many other fields. The displacement sensor of the hydraulic cylinder, as the core sensing element in this system, plays a crucial role, converting the cylinder's displacement into electrical signals to achieve precise position control.

[0003] The arrangement of displacement sensors has a crucial impact on the structure of hydraulic cylinders. For hydraulic cylinders with milled flat bottoms, existing technologies often use flange connections to house the displacement sensors. For example, Chinese Utility Model Patent CN202222625990.0 discloses a protective device for a built-in displacement sensor probe, where the displacement sensor is fixed between the cylinder bottom and the flange connection. However, such flange connections increase the overall size of the cylinder bottom, requiring more installation space for the hydraulic cylinder and complicating the spatial layout design. Furthermore, flange-connected cylinder bottoms also suffer from higher manufacturing costs and lower structural stability compared to welded designs.

[0004] Therefore, if the hydraulic cylinder with a milled flat bottom is designed as a conventional welded structure, the overall size of the cylinder bottom can be effectively reduced, manufacturing costs can be reduced, and structural stability can be increased. However, since the displacement sensor needs to be installed from the cylinder port to the reserved position on the cylinder bottom after the cylinder bottom is welded, on the one hand, it is not easy to prevent the displacement sensor from loosening, and it is at risk of falling off under special working conditions. On the other hand, for long-stroke hydraulic cylinders, the displacement sensor is difficult to install after the cylinder bottom is welded, which can easily cause the sensor to deform, resulting in poor straightness and affecting measurement accuracy. Therefore, it is not only difficult to install, but also difficult to disassemble.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a novel hydraulic cylinder with a built-in sensor. This cylinder features a sensor sleeve inside the cylinder to fix the displacement sensor to the bottom, preventing the displacement sensor from becoming loose.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a cylinder body, a displacement sensor, and a sensor retainer. The bottom of the cylinder body is provided with a stepped sensor mounting groove. The displacement sensor is installed in the middle step of the sensor mounting groove, and the sensor retainer is installed in the upper step of the sensor mounting groove. The sensor retainer is used to fix the displacement sensor to the bottom of the cylinder.

[0008] Based on the above, the displacement sensor includes a stepped electronic head, the large-diameter section of which is installed in the middle step of the sensor mounting groove, and the small-diameter section of which is located in the inner ring of the sensor sleeve.

[0009] Based on the above, the end face of the sensor sleeve abuts against the stepped surface between the large-diameter section and the small-diameter section of the electronic head, and the end face of the large-diameter section of the electronic head abuts against the stepped surface between the low-level step and the middle-level step of the sensor mounting groove.

[0010] Based on the above, the large-diameter section of the electronic head is interference-fitted with the sensor mounting groove, and the small-diameter section of the electronic head is provided with external threads.

[0011] Based on the above, the side wall of the higher level of the sensor mounting slot is provided with an internal thread, and the outer side wall of the sensor retainer is provided with an external thread. The sensor retainer is installed in the sensor mounting slot through threaded engagement.

[0012] Based on the above, the sensor sleeve is provided with at least two axial holes.

[0013] Based on the above, the cylinder bottom sidewall is provided with a cable hole, which is connected to the lower level of the sensor mounting slot, and the port of the cable hole is provided with a waterproof connector.

[0014] Based on the above, the sidewall of the displacement sensor is provided with a sealing groove, and a sealing element is provided in the sealing groove. The sealing element is located between the displacement sensor and the sensor mounting groove.

[0015] Based on the above, the hydraulic cylinder also includes a piston rod, the displacement sensor includes a measuring rod, the piston rod is provided with a deep hole for inserting the measuring rod, the deep hole port is provided with a stepped magnetic ring mounting groove, a magnetic ring is installed at the lower step of the magnetic ring mounting groove, and a tapered hole guide sleeve is installed at the higher step of the magnetic ring mounting groove. The guide tapered hole of the tapered hole guide sleeve is used to guide the measuring rod through the magnetic ring and into the deep hole.

[0016] Based on the above, the outlet end face of the tapered hole sleeve abuts against the end face of the magnetic ring, the inner wall of the high-level step of the magnetic ring mounting groove is provided with a retaining ring groove, an elastic retaining ring is provided in the retaining ring groove, and the elastic retaining ring abuts against the inlet end face of the tapered hole sleeve so that the elastic retaining ring is installed into the magnetic ring mounting groove.

[0017] This utility model has substantial features and progress compared to the prior art. Specifically, the bottom end face of the hydraulic cylinder of this application is provided with a stepped sensor mounting groove. The displacement sensor is installed in the middle step of the sensor mounting groove, and the sensor retainer is installed in the high step of the sensor mounting groove. In this way, the sensor retainer can effectively fix the displacement sensor in the sensor mounting groove through the height difference of the steps, preventing the displacement sensor from loosening or falling off.

[0018] Meanwhile, the stepped displacement sensor head allows for easy installation of the displacement sensor into the sensor mounting slot at the bottom of the cylinder. The sensor sleeve with axial holes and external threads facilitates easy installation into the sensor mounting slot. The tapered hole bushing allows for easy installation of the piston rod into the cylinder body, and also enables non-destructive disassembly for convenient maintenance. Waterproof connectors and seals ensure the sealing performance of the displacement sensor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure and a cross-sectional view of the novel built-in sensor hydraulic cylinder of this utility model (some structures are not shaded).

[0020] Figure 2 yes Figure 1 A detailed schematic diagram of point A in the middle;

[0021] Figure 3 This is a schematic diagram of the overall structure and a cross-sectional view of the disassembly and assembly tool of this utility model.

[0022] In the figure, the reference numerals are as follows: cylinder body 1, cylinder bottom 11, cylinder barrel 12, cable hole 101; displacement sensor 2, electronic head 21, measuring rod 22, cable 23, waterproof connector 24, seal 25; sensor retainer 3, axial hole 301; piston rod 4, piston 41, guide sleeve 42, deep hole 401; sensor magnetic ring 5, tapered hole lead sleeve 51, leading tapered hole 501; disassembly and assembly tool 6, first end interface 61, second end interface 62, end thread 63, chuck 64. Detailed Implementation

[0023] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0024] Example 1

[0025] like Figures 1-3 As shown, the novel built-in sensor hydraulic cylinder of this application includes a cylinder body 1, which includes a cylinder bottom 11 and a cylinder barrel 12. A guide sleeve 42 is provided at the end of the cylinder body 1, and a piston rod 4 and a piston 41 are installed inside the cylinder body 1.

[0026] The novel built-in sensor hydraulic cylinder of this application also includes a displacement sensor 2 to detect the stroke of the piston rod 4. When the cylinder bottom 11 needs to be milled flat, in order to reduce the overall size of the cylinder body 1, the displacement sensor 2 usually needs to be built in, and it is generally necessary to connect the cylinder bottom 11 and the cylinder barrel 12 by welding. For example, a bevel is set on the cylinder bottom 11 for welding with the cylinder barrel 12 and welding is performed at the bevel. The displacement sensor 2 usually needs to be installed into the cylinder bottom 11 after the cylinder bottom 11 and the cylinder barrel 12 are welded. Therefore, the installation and fixation of the displacement sensor 2 have many difficulties. One of them is that because the displacement sensor 2 is deep inside the cylinder body 1, it is difficult to implement a means to fix the displacement sensor 2, it is not easy to carry out anti-loosening treatment on the displacement sensor 2, and there is a risk of it falling off under special working conditions.

[0027] The novel built-in sensor hydraulic cylinder of this application also includes a sensor retainer 3. A stepped sensor mounting groove is provided on the end face of the cylinder bottom 11 of the cylinder body 1. The stepped sensor mounting groove includes three stepped spaces: a low step, a middle step, and a high step. The displacement sensor 2 is installed in the middle step of the sensor mounting groove, and the sensor retainer 3 is installed in the high step of the sensor mounting groove. In this way, the sensor retainer 3 can fix the displacement sensor 2, so that the displacement sensor 2 is firmly fixed on the cylinder bottom 11, preventing the displacement sensor 2 from loosening or falling off.

[0028] Example 2

[0029] Based on Embodiment 1, the novel built-in sensor hydraulic cylinder displacement sensor 2 of this embodiment includes a stepped electronic head 21. The stepped electronic head 21 includes two neck widths: a large diameter section and a small diameter section, thereby generating a height difference. The measuring rod 22 of the displacement sensor 2 is located in the small diameter section of the electronic head 21, and the cable 23 of the displacement sensor 2 is located in the large diameter section of the electronic head 21. The large diameter section of the electronic head 21 is installed in the middle of the sensor mounting groove, and the small diameter section of the electronic head 21 is located within the inner ring of the sensor retainer 3.

[0030] Furthermore, by using the end face of the sensor sleeve 3 to abut against the stepped surface between the large and small diameter sections of the electronic head 21, and the end face of the large diameter section of the electronic head 21 to abut against the stepped surface between the low and middle steps of the sensor mounting groove, the displacement sensor 2 can be installed more stably inside the cylinder bottom 11.

[0031] In this embodiment, by setting the electronic head 21 of the displacement sensor 2 in a stepped shape, the small diameter section of the electronic head 21 is placed within the inner ring of the sensor retainer 3, which can protect the measuring rod 22 of the displacement sensor 2; at the same time, by installing the large diameter section of the electronic head 21 in the middle step of the sensor mounting groove, the sensor retainer 3 can effectively fix the electronic head 21 of the displacement sensor 2 in the sensor mounting groove through the height difference of the steps.

[0032] Example 3

[0033] Based on Embodiment 2, in the novel built-in sensor hydraulic cylinder of this embodiment, the small-diameter section of the electronic head 21 of the displacement sensor 2 is provided with external threads. In addition, the large-diameter section of the electronic head 21 of the displacement sensor 2 can be connected to the middle step of the sensor mounting groove by interference fit; or in other embodiments, for example, the two are connected by interlocking rather than interference fit, and a limiting structure (such as a limiting pin) is provided between them to prevent the electronic head 21 from rotating in the sensor mounting groove.

[0034] Using the structure in this embodiment, the displacement sensor 2 of the novel built-in sensor hydraulic cylinder can be disassembled and assembled using the disassembly and assembly tool 6. For example, the disassembly and assembly tool 6 is cylindrical and can extend into the inner cavity of the cylinder body 1. The measuring rod 22 of the displacement sensor 2 can extend into the inner cavity of the disassembly and assembly tool 6, and the external thread of the small-diameter section of the electronic head 21 and the internal thread on the first end interface 61 of the disassembly and assembly tool 6 (e.g., ...) Figure 3 The end thread 63 of the sensor is engaged with the displacement sensor 2. Thus, the disassembly tool 6 can carry the displacement sensor 2 into the cylinder 1 and install the large diameter section of the electronic head 21 of the displacement sensor 2 in the sensor mounting slot (interference fit). Then, by rotating, the disassembly tool 6 is unscrewed from the electronic head 21 and removed from the cylinder 1, thereby installing the displacement sensor 2. It is easy to understand that the displacement sensor 2 can be disassembled by reversing the above process.

[0035] Therefore, in this embodiment, by using the external thread of the electronic head 21 of the displacement sensor 2 and the interference fit between the electronic head 21 and the cylinder bottom 11, the displacement sensor 2 can be quickly, conveniently and accurately installed and removed from the cylinder bottom 11; by having the installation and removal tool 6 pass through the measuring rod 22 and connect to the electronic head 21, deformation and damage to the displacement sensor 2 can be avoided.

[0036] Example 4

[0037] Based on Embodiment 2, the difference between this embodiment and Embodiment 3 is that other means can be used to connect the disassembly tool 6 and the small diameter section of the electronic head 21. For example, a snap-fit ​​connection scheme can be used, with a snap-fit ​​(lug) provided on the inner wall of the first end interface 61 of the disassembly tool 6, and a slot provided on the side wall of the small diameter section of the electronic head 21. The two are connected by rotating a certain angle or separated by rotating a certain angle.

[0038] Example 5

[0039] Based on Embodiments 1 to 4, in the novel built-in sensor hydraulic cylinder of this embodiment, the side wall of the high-level sensor mounting groove is provided with an internal thread, the outer side wall of the sensor sleeve 3 is provided with an external thread, and the sensor sleeve 3 and the sensor mounting groove are engaged by the thread.

[0040] To facilitate the installation and removal of the sensor cover 3, at least two axial holes 301 are provided on the bottom surface of the sensor cover 3. The axial holes 301 can be configured as through holes or blind holes.

[0041] In this embodiment, the second end interface 62 of the disassembly and assembly tool 6 is provided with at least two claws 64; the disassembly and assembly tool 6 in this embodiment can be the same disassembly and assembly tool 6 as in embodiment 3 or embodiment 4, or two independent disassembly and assembly tools 6 can be used.

[0042] When the same disassembly and assembly tool 6 is used, the chuck 64 can be located at the opposite end port of the disassembly and assembly tool 6, which has an internal thread.

[0043] When the same disassembly and assembly tool 6 is used, the claw 64 at the second end interface 62 of the disassembly and assembly tool 6 can be installed on the inner wall of the port, the outer wall of the port, or the end face of the port, depending on the actual situation (such as when a conical cylinder or a stepped cylinder is used).

[0044] When two independent disassembly and assembly tools 6 are used, the cylinder diameter can be freely set, so the claws 64 can also be installed on the inner wall of the port, the outer wall of the port, or the end face of the port according to the actual situation.

[0045] The chuck 64 engages with the axial hole 301, and the second end interface 62 of the disassembly and assembly tool 6 can extend into the cylinder 1 to disassemble and assemble the sensor sleeve 3.

[0046] Specifically, in this embodiment, the second end interface 62 of the disassembly and assembly tool 6 is provided with at least two claws 64. The claws 64 can be inserted into the axial hole 301 by means of interference fit or magnetic connection, or the sensor sleeve 3 can simply be suspended on the claws 64 due to its own weight. Since both the port of the disassembly and assembly tool 6 and the sensor sleeve 3 can pass through the measuring rod 22, the sensor sleeve 3 can be carried into the cylinder 1 by the disassembly and assembly tool 6. Then, by rotating the disassembly and assembly tool 6, the sensor sleeve 3 is tightened into the large diameter section of the sensor mounting slot, thereby installing the sensor sleeve 3. It is easy to understand that the sensor sleeve 3 can be disassembled by reversing the above process.

[0047] In other embodiments, a retaining ring can be used to fix the sensor retainer 3 to the large diameter section of the sensor mounting groove. For example, the side wall of the large diameter section of the sensor mounting groove is provided with a retaining ring groove. After the sensor retainer 3 is placed into the large diameter section of the sensor mounting groove, the retaining ring is placed into the retaining ring groove using the disassembly and assembly tool 6, thereby fixing the sensor retainer 3.

[0048] Example 6

[0049] Based on Embodiments 1-5, in this embodiment, the side wall of the cylinder bottom 11 is provided with a cable hole 101, the lower step of the sensor mounting groove is connected to the cable hole 101, and the port of the cable hole 101 is provided with a waterproof connector 24 to ensure the sealing performance of the displacement sensor 2; the cable 23 of the displacement sensor 2 is connected outward from the lower step of the sensor mounting groove and the cable hole 101, and the cable 23 is located on the large diameter end face of the electronic head 21.

[0050] In addition, the side wall of the displacement sensor 2 is provided with a sealing groove, and a sealing element 25 is provided in the sealing groove. The sealing element 25 is located between the large diameter section of the electronic head 21 of the displacement sensor 2 and the middle position of the sensor mounting groove. The sealing element 25 can be an O-ring or the like.

[0051] It is worth noting that in this application, the stepped sensor mounting groove is described as having three steps, namely a low step, a middle step, and a high step. The low step is mainly used to connect with the cable hole 101 so that the cable 23 of the displacement sensor 2 can be led out from the cylinder 1. Therefore, the low step of the sensor mounting groove in this application can be regarded as part of the cable hole 101 (i.e., the cable hole 101 is set to an L shape). When the low step can be regarded as part of the cable hole 101, the stepped sensor mounting groove can also be regarded as a two-stage stepped structure, which actually plays an equivalent role to the three-stage stepped mechanism in this application.

[0052] Example 7

[0053] Based on Embodiments 1-5, the novel built-in sensor hydraulic cylinder of this embodiment also includes a piston rod 4, and the displacement sensor 2 includes a measuring rod 22. The piston rod 4 is provided with a deep hole 401 for inserting the measuring rod 22. The port of the deep hole 401 is provided with a magnetic ring 5 and a tapered hole sleeve 51. The tapered hole sleeve 51 is provided with a guide to the tapered hole 501. The measuring rod 22 is located on the small-diameter end face of the electronic head 21.

[0054] Specifically, the deep hole 401 port is provided with a stepped magnetic ring mounting groove. The magnetic ring 5 is installed on the lower step of the magnetic ring mounting groove, and the tapered hole sleeve 51 is installed on the higher step of the magnetic ring mounting groove. The outlet end face of the tapered hole sleeve 51 abuts against the end face of the magnetic ring 5. The inner wall of the higher step of the magnetic ring mounting groove is provided with a retaining ring groove, and an elastic retaining ring is provided in the retaining ring groove. The elastic retaining ring abuts against the inlet end face of the tapered hole sleeve 51 so that the elastic retaining ring is installed into the magnetic ring mounting groove.

[0055] The inlet end face of the tapered hole guide sleeve 51 is the end face leading to the wide end of the tapered hole 501, which refers to the inlet end when the guide rod 22 passes through. The outlet end face of the tapered hole guide sleeve 51 is the end face leading to the small end of the tapered hole 501, which refers to the outlet end when the guide rod 22 passes through.

[0056] When installing the piston rod 4 into the cylinder barrel 12 of the cylinder body 1, the piston rod 4 is pushed into the cylinder body 1. The head of the probe 22 passes through the guide cone 501 of the cone hole sleeve 51. The guide cone 501 can guide the probe 22 through the magnetic ring 5 and into the deep hole 401, thus avoiding mechanical damage to the probe 22.

[0057] The disassembly and assembly process of this utility model is as follows: When installing the displacement sensor 2, the cylindrical disassembly and assembly tool 6 is connected to the small diameter section of the electronic head 21 of the displacement sensor 2, the probe 22 is inserted into the inner cavity of the disassembly and assembly tool 6, and the disassembly and assembly tool 6 is used to carry the displacement sensor 2 into the inner cavity of the cylinder 1, so that the large diameter section of the electronic head 21 is installed in the middle position of the sensor mounting slot at the bottom of the cylinder 11, and then the disassembly and assembly tool 6 is withdrawn from the cylinder 1; the disassembly and assembly tool 6 is connected to the sensor retaining sleeve 3, and the disassembly and assembly tool 6 is used to carry the sensor retaining sleeve into the cylinder 1, the disassembly and assembly tool 6 passes through the probe 22, so that the sensor retaining sleeve 3 is installed in the high position of the sensor mounting slot at the bottom of the cylinder 11; when installing the piston rod 4, the guide cone hole 501 can guide the probe 22 through the magnetic ring 5 and extend into the deep hole 401.

[0058] The disassembly process is simply the reverse of the above process.

[0059] The entire loading and unloading process is simple and efficient, easy to operate and easy to learn. It can avoid deformation and damage to displacement sensor 2, and can achieve quick and non-destructive assembly and disassembly.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A novel hydraulic cylinder with a built-in sensor, characterized in that, The device includes a cylinder body (1), a displacement sensor (2), and a sensor sleeve (3). The cylinder bottom (11) of the cylinder body (1) is provided with a stepped sensor mounting groove. The displacement sensor (2) is installed in the middle step of the sensor mounting groove, and the sensor sleeve (3) is installed in the upper step of the sensor mounting groove. The sensor sleeve (3) is used to fix the displacement sensor (2) to the cylinder bottom (11).

2. The novel built-in sensor hydraulic cylinder according to claim 1, characterized in that, The displacement sensor (2) includes a stepped electronic head (21), the large diameter section of which is installed in the middle step of the sensor mounting groove, and the small diameter section of which is located in the inner ring of the sensor sleeve (3).

3. The novel built-in sensor hydraulic cylinder according to claim 2, characterized in that, The end face of the sensor sleeve (3) abuts against the stepped surface between the large-diameter section and the small-diameter section of the electronic head (21), and the end face of the large-diameter section of the electronic head (21) abuts against the stepped surface between the low-level step and the middle-level step of the sensor mounting groove.

4. The novel built-in sensor hydraulic cylinder according to claim 2, characterized in that, The large diameter section of the electronic head (21) is interference-fitted with the middle section of the sensor mounting groove, and the small diameter section of the electronic head (21) is provided with external threads.

5. The novel built-in sensor hydraulic cylinder according to claim 1, characterized in that, The sensor mounting slot has an internal thread on its high-level sidewall and an external thread on its outer sidewall. The sensor sleeve (3) is installed in the sensor mounting slot by means of threaded engagement.

6. The novel built-in sensor hydraulic cylinder according to claim 1 or 5, characterized in that, The sensor sleeve (3) is provided with at least two axial holes (301).

7. The novel built-in sensor hydraulic cylinder according to claim 1, characterized in that, The side wall of the cylinder bottom (11) is provided with a cable hole (101), which is connected to the lower level of the sensor mounting slot. The port of the cable hole (101) is provided with a waterproof connector (24).

8. The novel built-in sensor hydraulic cylinder according to claim 1, 2, 3, or 4, characterized in that, The displacement sensor (2) has a sealing groove on its side wall, and a sealing element (25) is provided in the sealing groove. The sealing element (25) is located between the displacement sensor (2) and the sensor mounting groove.

9. The novel built-in sensor hydraulic cylinder according to claim 1, 2, 3, or 4, characterized in that, The hydraulic cylinder also includes a piston rod (4), and the displacement sensor (2) includes a measuring rod (22). The piston rod (4) is provided with a deep hole (401) for inserting the measuring rod (22). The port of the deep hole (401) is provided with a stepped magnetic ring mounting groove. A magnetic ring (5) is installed at the lower level of the magnetic ring mounting groove, and a tapered hole guide sleeve (51) is installed at the higher level of the magnetic ring mounting groove. The guide tapered hole (501) of the tapered hole guide sleeve (51) is used to guide the measuring rod (22) through the magnetic ring (5) and into the deep hole (401).

10. The novel built-in sensor hydraulic cylinder according to claim 9, characterized in that, The outlet end face of the tapered hole sleeve (51) abuts against the end face of the magnetic ring (5). The inner wall of the high-level step of the magnetic ring mounting groove is provided with a retaining ring groove. An elastic retaining ring is provided in the retaining ring groove. The elastic retaining ring abuts against the inlet end face of the tapered hole sleeve (51) so that the elastic retaining ring is installed into the magnetic ring mounting groove.

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