Angle sensor swing cylinder

Abstract

The present application relates to the technical field of oil cylinder, and discloses a swing oil cylinder with an angle sensor, which comprises a cylinder barrel, an output nut and a fixed screw rod, the output nut and the fixed screw rod are arranged in the cylinder barrel, one end of the fixed screw rod away from the output nut is provided with an angle sensor, a sensor shaft of the angle sensor is adapted to axially penetrate through the fixed screw rod and be connected with the output nut, the output nut is adapted to drive the sensor shaft to synchronously rotate, and the rotation angle of the swing oil cylinder is output through the angle sensor. The output nut is arranged in the cylinder barrel, and the angle sensor is arranged at one end of the fixed screw rod away from the output nut, the sensor shaft of the angle sensor penetrates through the fixed screw rod and is connected with the output nut, when the swing oil cylinder moves, the output nut drives the sensor shaft to rotate, and the rotation angle of the swing oil cylinder is output through the sensor shaft to the angle sensor, and through the combination of the angle sensor and the swing oil cylinder, the rotation angle of the swing oil cylinder in the use process can be accurately detected.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinders, and in particular to a swing hydraulic cylinder with an angle sensor. Background Technology

[0002] The oscillating cylinder, as an actuator, utilizes a two-set helical spline structure with opposite helical pairs to achieve its operation. It is an actuator with high torque output, and its main body is cylindrical. A fixing nut with helical teeth is welded to the inner wall of the cylinder. Inside the cylinder is a coaxially extending output screw, with a helical spline design on its outer circumference. The hollow screw serves as the piston of the oscillating cylinder, forming an annular sleeve. Its inner and outer diameters are designed with helical splines that mesh with the helical splines of the output screw and the fixing nut. In operation, the cylinder is typically fixed to the frame, and the end face of the output screw is fixed to the rotating parts. Under hydraulic pressure, the hollow screw moves within the cylinder, and the helical teeth drive the output screw to rotate, thus achieving the rotational action.

[0003] However, existing swing cylinders have the following drawbacks:

[0004] (1) Existing swing cylinders cannot accurately measure the angle during use, and the rotation angle can only be estimated manually by the starting and ending positions.

[0005] (2) The existing technology uses welding to connect the fixing nut to the inner wall of the cylinder, which will damage the cylinder to a certain extent, increase the processing steps and increase the production cost of the swing cylinder.

[0006] (3) In the application of large-scale and high-torque output, the existing swing cylinder uses an output screw to output torque. The output screw diameter is limited, which has a weak point and is at risk of breakage during overload operation. At the same time, the cylinder has little advantage in terms of overall size, weight and cost.

[0007] (4) The existing swing cylinder has a short mating surface between the output shaft and the cylinder barrel, which limits its ability to withstand lateral loads.

[0008] In view of this, it is necessary to develop a swing cylinder with an angle sensor to solve the above problems. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a swing cylinder with an angle sensor, which can detect the rotation angle during the practical application of the swing cylinder and output torque through the output nut, thereby improving the torque output capability and the lateral load bearing capacity.

[0010] To address the aforementioned technical problems, the first aspect of this invention provides a swing cylinder with an angle sensor, comprising a cylinder barrel, an output nut, and a fixed screw. The output nut and the fixed screw are disposed within the cylinder barrel, and an angle sensor is provided at the end of the fixed screw away from the output nut. The sensor shaft of the angle sensor is adapted to axially penetrate the fixed screw and connect to the output nut. The output nut is adapted to drive the sensor shaft to rotate synchronously, so that the rotation angle of the swing cylinder can be output through the angle sensor.

[0011] Preferably, the cylinder is further provided with a hollow screw rod, which is disposed between the output nut and the fixed screw rod, so as to separate the internal cavity of the cylinder into multiple chambers.

[0012] More preferably, the cylinder is provided with a plurality of oil ports, which are adapted to connect the gaps between the output nut and the hollow screw, and between the hollow screw and the fixed screw, respectively.

[0013] Through the above-mentioned preferred technical solution, the hollow screw is used in conjunction with the fixed screw and the output screw, and the internal chamber of the cylinder is divided into multiple chambers. The hollow screw and the fixed screw, as well as the hollow screw and the output nut, are connected to oil ports respectively. Oil is supplied to the gaps between each screw through multiple oil ports to improve the overall working efficiency of the hydraulic cylinder.

[0014] More preferably, one end of the fixing screw is provided with a first external helical spline, and the connection end between the hollow screw and the fixing screw is provided with a first internal helical spline. The first external helical spline on the fixing screw and the first internal helical spline on the hollow screw together constitute a first helical pair.

[0015] Preferably, the connection end between the hollow screw and the output nut is provided with a second outer spiral pattern, and the output nut is provided with a second inner spiral pattern. The second outer spiral pattern on the hollow screw and the second inner spiral pattern on the output nut together constitute a second spiral pair.

[0016] More preferably, the first helical pair has opposite rotation directions to the second helical pair.

[0017] Through the above-mentioned preferred technical solution, multiple helical pairs are formed by the combination of internal and external helical patterns between the fixed screw, hollow screw and output nut. The transmission function inside the cylinder can be realized through multiple helical pairs, and welding is not required, thus avoiding damage to the inside of the cylinder caused by welding.

[0018] Preferably, the cylinder barrel includes a welded cylinder barrel component and a stepped inner wall. One end of the welded cylinder barrel component is connected to the output nut via a gasket. The inner wall of the welded cylinder barrel component is connected to the output nut via a guide ring. A positioning nut is also provided on the stepped inner wall, and the output nut and the stepped inner wall are adapted to abut against the inner and outer walls of the positioning nut, respectively, to form a positioning. Through this preferred technical solution, by providing a positioning nut inside the cylinder barrel, and using the stepped inner wall of the cylinder barrel and the output nut together to form a positioning effect on the positioning nut, the output nut can only rotate.

[0019] Preferably, both the output nut and the positioning nut have a non-threaded stepped surface near the fixed screw. Multiple spline grooves are formed on the non-threaded stepped surface, and the number of spline grooves formed on the non-threaded stepped surface of the positioning nut is greater than the number of rectangular splines formed on the non-threaded stepped surface of the output nut.

[0020] More preferably, the output nut and the positioning nut have the same specifications for the multiple spline grooves, and the spline grooves are also provided with spline locking rings. The spline locking rings are adapted to be embedded in the multiple spline grooves so as to simultaneously fasten the positioning nut and the output nut.

[0021] Through the above-mentioned preferred technical solution, the spline locking ring and spline groove can provide a stable fastening effect on the output nut and the hollow screw.

[0022] Preferably, the spline locking ring has a shaft elastic retaining ring at one end near the fixing screw, and the shaft elastic retaining ring is adapted to restrict the axial movement of the spline locking ring.

[0023] Through the above technical solution, the swing cylinder with angle sensor of the present invention has an output nut set inside the cylinder barrel and an angle sensor set at the end of the fixed screw away from the output nut. The sensor shaft of the angle sensor passes through the fixed screw and is connected to the output nut. When the swing cylinder moves, the output nut drives the sensor shaft to rotate and transmits the rotation angle of the swing cylinder to the angle sensor through the sensor shaft. Through the combination of the angle sensor and the swing cylinder, the rotation angle of the swing cylinder can be accurately detected during use.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of a swing cylinder with an angle sensor according to a specific embodiment of the present invention.

[0026] Figure 2This is a side view of a swing cylinder with an angle sensor according to a specific embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of one end of the sensor shaft of the swing cylinder with angle sensor according to a specific embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the locking structure of the output nut of the swing cylinder with angle sensor according to a specific embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Pressing cover plate; 2. Sensor shaft; 3. Output nut; 4. Cylinder welded parts; 5. Gasket; 6. Balance valve; 7. Positioning nut; 8. Spline locking ring; 9. Shaft elastic retaining ring; 10. Valve block; 11. Hollow screw; 12. Cylindrical pin; 13. Piston; 14. Right angle pipe joint; 15. Fixing screw; 16. Angle sensor; 17. Fixing cover plate. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, the term "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] refer to Figure 1 A specific embodiment of the present invention provides a swing cylinder with an angle sensor, comprising a cylinder barrel, an output nut 3, and a fixing screw 15. Both the output nut 3 and the fixing screw 15 are disposed within the cylinder barrel. An angle sensor 16 is provided at the end of the fixing screw 15 away from the output nut 3. The sensor shaft 2 of the angle sensor 16 is adapted to axially pass through the fixing screw 15 and be connected to the output nut 3. Therefore, when the output nut 3 rotates, it is adapted to drive the sensor shaft 2 to rotate synchronously. The sensor shaft 2 transmits the rotational motion to the angle sensor 16, thereby enabling the angle sensor 16 to output the rotation angle of the swing cylinder. Therefore, by combining the angle sensor 16 with the swing cylinder, the rotation angle of the swing cylinder can be accurately detected during use.

[0034] The following is combined Figures 1 to 4The oscillating cylinder with angle sensor is described in detail. One end of the cylinder barrel, equipped with an output nut 3, is also fitted with a clamping cover plate 1, and the other end is fitted with a fixing cover plate 17. The clamping cover plate 1 and the output nut 3 are detachably connected by screws. The fixing tube plate and the fixing screw 15 are also detachably connected by screws. The connection end between the sensor shaft 2 and the output nut 3 is shown in [reference needed]. Figure 3 The end face of the sensor shaft 2 is recessed inward along its axial direction to form a connection port that can be connected to the output nut 3. The diameter of the connection end of the sensor shaft 2 is smaller than the diameter of its middle section. A stepped installation structure is provided at the connection end of the sensor shaft 2 to facilitate the installation and fixation between the sensor shaft 2 and the output nut 3. The two are also fixed by bolt connection.

[0035] Furthermore, the swing cylinder with angle sensor outputs torque through output nut 3. Since the radial dimension of output nut 3 is large, that is, the diameter of the radial nut is large, it can improve the torque output capability and the lateral load bearing capacity to a certain extent in a large-size, high-torque swing cylinder with a more compact size, lighter weight and lower cost.

[0036] Specifically, a hollow screw 11 is provided inside the cylinder. The hollow screw 11 is located between the output nut 3 and the fixed screw 15. The sensor shaft 2 passes through the fixed screw 15 and the hollow screw 11 in sequence and is connected to the output nut 3. The hollow screw 11 and the sensor shaft 2 are sealed with a sealing ring. Furthermore, the hollow screw 11 can divide the internal cavity of the cylinder into multiple chambers. The fixed screw 15 and the sensor are sealed with a dustproof ring and a rod sealing ring to prevent external foreign matter from contaminating the cylinder and to prevent oil leakage. In addition, a piston 13 is provided on the hollow screw 11. The piston 13 is threadedly connected to the hollow screw 11. In order to prevent the screw from axially displacing, a cylindrical pin 12 is provided at the end of the piston 13 near the fixed screw 15. The cylindrical pin 12 can prevent the piston 13 from loosening and limit the piston 13 from axially displacing. Sealing rings are provided between the piston 13 and the inner wall of the cylinder and the hollow screw 11, thereby further dividing the inner cavity of the cylinder into two chambers.

[0037] More specifically, one end of the fixing screw 15 is provided with a first external helical pattern, and the connection end between the hollow screw 11 and the fixing screw 15 is provided with a first internal helical pattern. The first external helical spline on the fixing screw 15 and the first internal helical spline on the hollow screw 11 together form a first helical pair. The connection end between the hollow screw 11 and the output nut 3 is provided with a second external helical pattern, and the output nut 3 is provided with a second internal helical pattern. The second external helical pattern on the hollow screw 11 and the second internal helical pattern on the output nut 3 together form a second helical pair, and the first helical pair and the second helical pair have opposite directions of rotation.

[0038] In addition, multiple oil ports are provided inside the cylinder. Among them, oil port a is located between the fixed screw 15 and the hollow screw 11, and oil port b is located between the output nut 3 and the hollow screw 11. Oil ports a and b are connected by oil pipes, and a right-angle pipe joint 14 is provided at the corner. A valve block 10 is provided at the end near oil port b. A balance valve 6 is provided inside the valve block 10. The balance valve 6 is connected to the pipeline of oil port b and is fixed by the valve block 10. Oil ports a and b are suitable for supplying oil to the output nut 3, hollow screw 11, and fixed screw 15. When oil enters through oil port b, the hollow screw 11 moves to the right in a straight line or rotates under the action of oil pressure. Since the first and second helical pairs have opposite directions of rotation, the internal thread spline of the output nut 3 begins to rotate under the action of the external thread spline of the hollow screw 11, thereby realizing the operation of the swing cylinder. Furthermore, the cylinder barrel adopts a connection and transmission method using internal and external thread splines instead of welding, which avoids damage to the cylinder barrel and other parts, reduces the processing steps, and only requires the internal and external thread splines to be assembled, thus improving the service life of the swing cylinder.

[0039] See Figure 1 The cylinder is also equipped with a cylinder welded part 4 and a stepped inner wall. A positioning nut 7 is provided on the stepped inner wall, and the output nut 3 can abut against the inner wall of the positioning nut 7. The stepped inner wall can abut against the outer wall of the positioning nut 7. The output nut 3 and the stepped inner wall can form a positioning effect on the positioning nut 7, so that the output nut 3 can only rotate.

[0040] The positioning nut 7 is connected to the inner wall of the stepped part of the cylinder by a washer 5. One end of the cylinder welded part 4 is also connected to the output nut 3 via a washer 5. The inner wall of the cylinder welded part 4 is connected to the output nut 3 via a guide ring. Due to the setting of the guide ring, it has a longer mating surface, which can further improve the ability to bear lateral loads.

[0041] See Figure 4Both the output nut 3 and the positioning nut 7 have a non-threaded stepped surface near the fixing screw 15. Multiple spline grooves are formed on these non-threaded stepped surfaces, with the number of spline grooves on the positioning nut 7 being greater than the number on the output nut 3. Furthermore, the multiple spline grooves on both the output nut 3 and the positioning nut 7 are of the same specification, with the output nut 3 and positioning nut 7 having the same corresponding spline groove. Additionally, a spline locking ring 8 is provided on the spline groove. The spline locking ring 8 is configured with multiple protruding rectangular annular keyway structures. By embedding the protruding keyways into the multiple spline grooves on the output nut 3 and the positioning nut 7, a tight fixing effect can be achieved for the positioning nut 7 and the output nut 3.

[0042] To limit the axial displacement of the spline locking ring 8, a shaft elastic retaining ring 9 is provided at one end of the spline locking ring 8 near the fixing screw 15. The shaft elastic retaining ring 9 can further restrict the axial movement of the spline locking ring 8, preventing it from moving axially. At the same time, the shaft elastic retaining ring 9, in conjunction with the spline locking ring 8, can achieve the function of locking the nut. Furthermore, the use of the spline locking ring 8 and the shaft elastic retaining ring 9 to lock the nut results in a larger overall force-bearing area and more uniform force distribution, which can better improve the locking ability of the fixing nut and improve the reliability, safety, and lifespan of the swing cylinder.

[0043] In the description of this invention, the reference to terms such as "one embodiment," "some embodiments," "one implementation," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this invention, 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.

[0044] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A swing cylinder with an angle sensor, characterized in that, The cylinder includes a cylinder barrel, an output nut (3), and a fixing screw (15). The output nut (3) and the fixing screw (15) are disposed inside the cylinder barrel. An angle sensor (16) is provided at the end of the fixing screw (15) away from the output nut (3). The sensor shaft (2) of the angle sensor (16) is adapted to axially pass through the fixing screw (15) and be connected to the output nut (3). The output nut (3) is adapted to drive the sensor shaft (2) to rotate synchronously so that the rotation angle of the swing cylinder can be output through the angle sensor (16). The cylinder is also provided with a hollow screw (11), which is located between the output nut (3) and the fixed screw (15) so that the internal cavity of the cylinder can be separated to form multiple chambers. The output nut (3) is sleeved on the hollow screw (11), and the hollow screw (11), the output nut (3), and the fixed screw (15) are all threadedly engaged. The cylinder has a stepped inner wall, and a positioning nut (7) is provided on the stepped inner wall. The output nut (3) and the stepped inner wall are adapted to abut against the inner wall and outer wall of the positioning nut (7) respectively to form a positioning. A spline locking ring (8) for connecting the output nut (3) and the positioning nut (7) is embedded between the output nut (3) and the positioning nut (7).

2. The swing cylinder with angle sensor according to claim 1, characterized in that, The cylinder is provided with multiple oil ports, which are adapted to connect the gaps between the output nut (3) and the hollow screw (11), and between the hollow screw (11) and the fixed screw (15), respectively.

3. The swing cylinder with angle sensor according to claim 1, characterized in that, One end of the fixed screw (15) is provided with a first external helical spline, and the connection end between the hollow screw (11) and the fixed screw (15) is provided with a first internal helical spline. The first external helical spline provided on the fixed screw (15) and the first internal helical spline provided on the hollow screw (11) together constitute a first helical pair.

4. The swing cylinder with angle sensor according to claim 3, characterized in that, The hollow screw (11) and the output nut (3) are connected at the end of the connection with the output nut (3) and are provided with a second outer spiral pattern. The output nut (3) is provided with a second inner spiral pattern. The second outer spiral pattern provided on the hollow screw (11) and the second inner spiral pattern provided on the output nut (3) together constitute a second spiral pair.

5. The swing cylinder with angle sensor according to claim 4, characterized in that, The first helical pair has the opposite rotation direction to the second helical pair.

6. The swing cylinder with angle sensor according to claim 1, characterized in that, The cylinder is provided with a cylinder welding component (4), one end of which is connected to the output nut (3) via a gasket (5), and the inner wall of the cylinder welding component (4) is connected to the output nut (3) via a guide ring.

7. The swing cylinder with angle sensor according to claim 6, characterized in that, Both the output nut (3) and the positioning nut (7) have a non-threaded stepped surface near the fixed screw (15). Multiple spline grooves are opened on the non-threaded stepped surface, and the number of spline grooves opened on the non-threaded stepped surface of the positioning nut (7) is greater than the number of spline grooves opened on the non-threaded stepped surface of the output nut (3).

8. The swing cylinder with angle sensor according to claim 7, characterized in that, The output nut (3) and the positioning nut (7) have the same specifications for multiple spline grooves, and the spline grooves are also provided with spline locking rings (8). The spline locking rings (8) are adapted to be embedded in multiple spline grooves so as to simultaneously fasten the positioning nut (7) and the output nut (3).

9. The swing cylinder with angle sensor according to claim 8, characterized in that, The spline locking ring (8) has a shaft elastic retaining ring (9) at one end near the fixing screw (15), which is adapted to restrict the spline locking ring (8) from axial movement.

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