Linear stroke compensation structure and device having the same

Abstract

This utility model discloses a linear stroke compensation structure and a device having the same. The linear stroke compensation structure includes a main body and a stroke compensation mechanism. The main body includes a cylinder, a piston, and a piston rod. The piston is movably disposed within the cylinder, and the piston rod is connected to the piston, passes through one side of the cylinder, and extends to the outside of the cylinder. One end of the connecting portion of the stroke compensation mechanism is connected to the piston rod, and a cavity is provided on the connecting portion. A pull rod is at least partially movably disposed within the cavity, with one end of the pull rod opposite to the piston rod extending out of the cavity. The pull rod and piston rod are coaxially arranged. A limiting portion is provided at one end of the pull rod disposed within the cavity, and an elastic element is sleeved on the outer periphery of the pull rod. The two ends of the elastic element abut against the limiting portion and the side wall of the cavity opposite to the limiting portion, respectively. This application can at least solve the problem that existing linear motion devices cannot accurately achieve the required linear motion stroke.

Description

Technical Field

[0001] This utility model relates to the field of linear motion device technology, and more specifically, to a linear stroke compensation structure and a device having the same. Background Technology

[0002] In existing technology, hydraulic cylinders, pneumatic cylinders, or electric actuators are commonly used in mechanical equipment as linear motion actuators. One end is fixed, and the other end, a piston rod, is connected to the desired moving part. When the moving part reaches the set position, the linear motion stops. However, in actual use, the required stroke of the moving part needs to be longer than the set stroke to meet the usage requirements. Therefore, higher stroke precision control or a larger operating stroke is required. However, if the piston has reached its maximum stroke and still cannot meet the usage requirements, forcibly increasing the piston stroke with external force will lead to equipment damage. Utility Model Content

[0003] The main objective of this invention is to provide a linear stroke compensation structure and a device having the same, which at least solves the problem that existing linear motion devices cannot accurately achieve the required linear motion stroke.

[0004] According to one aspect of the present invention, a linear travel compensation structure is provided, the linear travel compensation structure being at least used for connection with a moving part, the linear travel compensation structure comprising:

[0005] The main body includes a cylinder, a piston, and a piston rod. The piston is movably disposed within the cylinder, and the piston rod is connected to the piston, passes through one side of the cylinder, and extends to the outside of the cylinder.

[0006] A stroke compensation mechanism includes a connecting part, a pull rod, and an elastic element. One end of the connecting part is connected to the piston rod, and a cavity is provided on the connecting part. The pull rod is at least partially movably disposed in the cavity, and the end of the pull rod opposite to the piston rod extends out of the cavity. The pull rod is coaxially disposed with the piston rod. A limiting part is provided at the end of the pull rod disposed in the cavity, and the elastic element is sleeved on the outer periphery of the pull rod. The two ends of the elastic element abut against the limiting part and the side wall of the cavity opposite to the limiting part, respectively.

[0007] Furthermore, the stroke compensation mechanism also includes a limiting seat, which is connected to the connecting part and located on the side of the cavity away from the cylinder body. One end of the pull rod away from the piston rod passes through the limiting seat and can move relative to the limiting seat. The two ends of the elastic element abut against the limiting part and the limiting seat, respectively.

[0008] Furthermore, the limiting seat is screwed to the connecting part and located on the side of the cavity opposite to the cylinder body.

[0009] Furthermore, the stroke compensation mechanism also includes a guide sleeve, the end of the pull rod away from the piston rod passes through the guide sleeve and is fixedly connected to the guide sleeve, and the guide sleeve is at least partially sleeved on the side of the connecting part away from the cylinder body.

[0010] Furthermore, the stroke compensation mechanism also includes a connecting rod, one end of which is fixedly connected to one end of the pull rod that passes through the guide sleeve. The connecting rod is provided with a connecting hole, and the moving part is connected to the connecting rod through the connecting hole.

[0011] Furthermore, the end of the connecting portion near the piston rod is screwed into the piston rod.

[0012] Furthermore, a notch is provided on the outer side wall of the connecting part near the piston rod end, and the notch extends in the radial direction of the connecting part.

[0013] Furthermore, the piston rod has a threaded hole at the end opposite to the piston, and the threaded hole has a predetermined gap with the piston rod and the connecting part at the screw connection point. The connecting part has a through hole extending in the axial direction of the connecting part at one end near the piston rod, and the two ends of the through hole are respectively connected to the threaded hole and the cavity.

[0014] Furthermore, a mounting portion is provided on the end of the cylinder body away from the stroke compensation mechanism, and a mounting hole is provided on the mounting portion, the axis of the mounting hole being parallel to the axis of the connecting hole.

[0015] On the other hand, this application also provides a device that includes the linear travel compensation structure described above.

[0016] In this invention, by setting up a stroke compensation mechanism connected to the existing main body, in scenarios where stroke control precision is not high, when the cylinder drives the piston to move to the limit position, an external force is applied to compress the elastic element of the tie rod, so that the actual stroke of the tie rod meets the actual requirements. Thus, the required linear motion stroke can be accurately achieved without the need for high-precision stroke control, avoiding equipment damage and extending the service life of the main body. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the linear travel compensation structure disclosed in an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A sectional view;

[0020] Figure 3 This is an exploded view of the linear stroke compensation structure disclosed in an embodiment of the present utility model;

[0021] Figure 4 for Figure 3 A magnified view of a portion of region A in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of a device disclosed in an embodiment of the present utility model.

[0023] The above figures include the following reference numerals:

[0024] 10. Main body; 11. Cylinder; 12. Piston; 13. Piston rod; 131. Threaded hole; 14. Mounting part; 141. Mounting hole; 20. Stroke compensation mechanism; 21. Connecting part; 211. Cavity; 212. Notch; 213. Through hole; 22. Tie rod; 221. Limiting part; 222. Limiting step; 23. Elastic element; 24. Limiting seat; 241. Center hole; 25. Guide sleeve; 26. Connecting rod; 261. Connecting hole; 262. Chamfer; 30. Bearing; 100. Linear stroke compensation structure; 200. Equipment; 201. Moving parts. Detailed Implementation

[0025] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0028] As mentioned in the background section, in mechanical equipment, actuators such as hydraulic cylinders, pneumatic cylinders, or electric push rods are commonly used as linear motion actuators. One end is fixed, and the other end, a piston rod, is connected to the required moving part. When the moving part reaches the set position, the linear motion stops. However, in actual use, the required stroke of the moving part needs to be longer than the set stroke to meet the usage requirements. Therefore, higher stroke precision control or a larger operating stroke is required. However, if the piston has reached its maximum stroke and still cannot meet the usage requirements, forcibly increasing the piston stroke with external force will lead to equipment damage. To address this, this application provides a novel linear stroke compensation structure. This linear stroke compensation structure can at least solve the problem that existing linear motion devices cannot accurately achieve the required linear motion stroke without high-precision stroke control. The linear stroke compensation structure of this application will be described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 4 As shown, according to an embodiment of this application, a linear stroke compensation structure 100 is provided. The linear stroke compensation structure 100 is at least used for connection with a moving part 201, and the linear stroke compensation structure 100 includes: a main body 10 and a stroke compensation mechanism 20.

[0030] Specifically, the main body 10 includes a cylinder 11, a piston 12, and a piston rod 13. The piston 12 is movably disposed inside the cylinder 11. The piston rod 13 is connected to the piston 12 and passes through one side of the cylinder 11 and extends to the outside of the cylinder 11. The stroke compensation mechanism 20 includes a connecting part 21, a pull rod 22, and an elastic element 23. One end of the connecting part 21 is connected to the piston rod 13. A cavity 211 is provided on the connecting part 21. The pull rod 22 is at least partially movably disposed inside the cavity 211. The end of the pull rod 22 away from the piston rod 13 extends out of the cavity 211. The pull rod 22 is coaxially disposed with the piston rod 13. A limiting part 221 is provided at one end of the pull rod 22 disposed inside the cavity 211. The elastic element 23 is sleeved on the outer periphery of the pull rod 22. The two ends of the elastic element 23 abut against the limiting part 221 and the side wall of the cavity 211 away from the limiting part 221, respectively.

[0031] In actual operation, the piston rod 13 on the main body 10 is connected to the connecting part 21 of the stroke compensation mechanism 20. The stroke compensation mechanism 20 is connected to the moving part 201, and the pull rod 22 is coaxially arranged with the piston rod 13 to ensure that the compensation movement is along the axial direction of the piston 12, ensuring the consistency of the movement of the piston 12 and the pull rod 22, and improving the accuracy of stroke compensation. In scenarios where the stroke control accuracy is not high, when the cylinder 11 (such as a pneumatic cylinder, hydraulic cylinder, or electric cylinder) drives the piston 12 to move to the limit position, the extension length of the pull rod 22 cannot meet the actual requirements. At this time, by applying an external force to the pull rod 22, the limiting part 221 on the pull rod 22 in the cavity 211 overcomes the elastic force of the elastic element 23, causing the pull rod 22 to move along the axial direction of the pull rod 22. When the position of the piston 12 remains unchanged, the pull rod 22 moves to the stroke position actually required by the moving part 201, directly compensating for the deviation and ensuring that the final position of the pull rod 22 meets the actual requirements. This design solves the problem of "insufficient basic stroke" in low-precision control systems, and position calibration can be achieved through a simple structure without the need for high-precision drive components (such as servo motors).

[0032] During the compensation process, the piston 12 remains in a constant position, while only the tie rod 22 moves and compresses the elastic element 23. This prevents the core components responsible for the main stroke drive, such as the cylinder 11 and piston 12, from experiencing additional wear or fatigue due to the compensation action, thus extending their service life. Furthermore, the elastic deformation of the elastic element 23 (such as a spring) provides a "flexible buffer" for the compensation movement of the tie rod 22, preventing external forces from directly acting on the piston 12 or cylinder 11 and reducing the risk of damage to the cylinder wall of the cylinder 11 and the head of the piston 12 from rigid impacts. In addition, using the linear stroke compensation structure 100 of this application, the compensation action can be achieved solely by external force driving the tie rod 22, eliminating the need for additional sensors, control chips, or power sources (such as motors or solenoid valves), thus reducing equipment costs. Simultaneously, the connection between the connecting part 21, the elastic element 23, and the tie rod 22 is simple, requiring no significant modifications to the original core structure of the cylinder 11 and piston rod 13. It is compatible with various piston 12-cylinder 11 basic structures, has low modification costs, and a wide range of applications.

[0033] In other words, by setting up a stroke compensation mechanism 20 and connecting it to the existing main body 10, in scenarios where stroke control accuracy is not high, when the cylinder 11 drives the piston 12 to move to the limit position, an external force is applied to compress the elastic element 23 by the pull rod 22, so that the actual stroke of the pull rod 22 meets the actual requirements. Thus, the required linear motion stroke can be accurately achieved without the need for high-precision stroke control, avoiding equipment damage and extending the service life of the main body 10.

[0034] like Figure 2 As shown, the stroke compensation mechanism 20 also includes a limiting seat 24. The limiting seat 24 is connected to the connecting part 21 and located on the side of the cavity 211 away from the cylinder body 11. One end of the pull rod 22 away from the piston rod 13 passes through the limiting seat 24 and can move relative to the limiting seat 24. The two ends of the elastic element 23 abut against the limiting part 221 and the limiting seat 24, respectively. In this application, by providing the limiting seat 24 in the cavity 211, one end of the elastic element 23 no longer directly abuts against the side wall of the cavity 211. By using the limiting seat 24 as an intermediate transmission structure, frequent abutments are avoided, which would cause wear or deformation of the inner wall of the cavity 211, thus extending the service life of the cavity 211. For example, the limiting seat 24 can be made of a more wear-resistant and high-strength material (such as hardened steel).

[0035] Furthermore, the limiting seat 24 provides additional guiding support for the pull rod 22, ensuring that the pull rod 22 always moves along the central hole 241 of the limiting seat 24 during compression / rebound, further reducing the risk of radial displacement of the elastic element 23. In this application, the central hole 241 is a smooth hole, which facilitates the movement of the pull rod 22 relative to the limiting seat 24. The limiting seat 24 and the connecting part 21 are detachably connected, and the initial compression amount and maximum compression stroke of the elastic element 23 can be flexibly changed by using limiting seats 24 of different thicknesses or adjusting their installation position. For example, when a larger compensation range is required, the thickness of the limiting seat 24 can be increased to reduce the preload of the elastic element 23.

[0036] Furthermore, the limiting seat 24 seals the open end of the cavity 211, forming a structure similar to a "pressure vessel," effectively resisting the axial force generated when the elastic element 23 is compressed. Especially in high-frequency reciprocating compensation scenarios (such as stroke fine-tuning of vibration equipment), this structure can reduce the deformation of the connecting part 21 and maintain the rigidity of the stroke compensation mechanism 20. By setting this end of the limiting seat 24, the limiting seat 24, the elastic element 23, and the pull rod 22 can be pre-assembled into independent modules and then connected to the connecting part 21 as a whole, reducing on-site assembly procedures. Moreover, when the elastic element 23 ages and needs to be replaced, only the limiting seat 24 needs to be removed to take out the elastic element 23, without having to disassemble the entire connection between the connecting part 21 and the piston rod 13, improving maintenance efficiency.

[0037] See you again Figure 2 As shown, the limiting seat 24 is screwed to the connecting part 21 and located on the side of the cavity 211 away from the cylinder body 11. The screw connection has an adjustable screw depth: by rotating the limiting seat 24, the distance between it and the limiting part 221 inside the cavity 211 can be changed, thereby adjusting the initial compression (preload) of the elastic element 23 (such as a spring). The threaded connection forms a self-locking mechanism through helical friction, which can stably fix the relative position of the limiting seat 24 and the connecting part 21, preventing the limiting seat 24 from falling off or shifting due to vibration of the equipment 200 (such as the impact of the reciprocating motion of the piston 12), and ensuring the stable abutment state of the elastic element 23. In addition, if sealant is added to the threaded mating surface or an O-ring is installed, dust, liquid and other impurities can be prevented from entering the cavity 211, protecting the elastic element 23 and components such as the pull rod 22 (such as preventing rust from causing jamming), and extending the service life of the mechanism. At the same time, the use of screw connection can simplify the assembly and maintenance process. If it is necessary to replace the limit seat 24 with a different thickness, material or special function (such as integrated sensor mounting hole), only the part with the same thread specification needs to be replaced. There is no need to modify the structure of the connection part 21, which reduces the modification cost.

[0038] See Figures 1 to 4As shown, the stroke compensation mechanism 20 also includes a guide sleeve 25. The end of the pull rod 22 facing away from the piston rod 13 passes through the guide sleeve 25 and is fixedly connected to the guide sleeve 25. The guide sleeve 25 is at least partially fitted on the side of the connecting part 21 facing away from the cylinder body 11. This arrangement forms a cooperative guiding structure of "connecting part 21 - guide sleeve 25 - pull rod 22": when the pull rod 22 moves relative to the connecting part 21 due to compensation requirements, the guide sleeve 25 slides along the outer periphery of the connecting part 21, providing additional radial support for the pull rod 22 and preventing it from bending or shifting due to its long length or uneven force. In some high-frequency compensation or heavy load scenarios, the guide sleeve 25 can ensure that the pull rod 22 always remains coaxial with the piston rod 13, reducing uneven force on the elastic element 23 caused by radial wobble (such as spring misalignment or local wear), and extending the service life of the components. In addition, the guide sleeve 25 is partially sleeved on the outside of the connecting part 21, which can form a "nested protection" at the point where the connecting part 21 and the pull rod 22 pass through, preventing external dust, oil, debris and other contaminants from entering the cavity 211 and avoiding the elastic element 23, the limiting part 221 and other components from getting stuck or worn due to contamination.

[0039] Furthermore, in this application, the guide sleeve 25 and the pull rod 22 are connected by threads. When the pull rod 22 or the guide sleeve 25 wears out and needs to be replaced, the replacement can be performed by disassembling the fixed connection between the guide sleeve 25 and the pull rod 22, without disassembling the overall structure between the connecting part 21 and the piston rod 13, thus reducing maintenance costs. Figure 4 As shown, a limiting step 222 is provided at the connection between the pull rod 22 and the guide sleeve 25. The diameter of the pull rod 22 is reduced at this point to fit with the inner hole of the guide sleeve 25, facilitating installation and positioning. Furthermore, the reduced diameter of the pull rod 22 at the limiting step 222 makes it easier to process the external thread and reduces production costs. This limiting step 222 can directly serve as an axial limiting structure for the guide sleeve 25: when the guide sleeve 25 is assembled onto the pull rod 22, the limiting step 222 abuts against the end face of the guide sleeve 25, restricting the guide sleeve 25 from moving along the direction of the pull rod 22 towards the piston rod 13. This eliminates the need for additional limiting rings, retaining rings, or other parts, simplifying the structure and preventing the guide sleeve 25 from shifting due to loosening of additional parts.

[0040] like Figures 1 to 3As shown, the stroke compensation mechanism 20 also includes a connecting rod 26. One end of the connecting rod 26 is fixedly connected to the end of the pull rod 22 that passes through the guide sleeve 25. The connecting rod 26 is provided with a connecting hole 261, and the moving part 201 is connected to the connecting rod 26 through the connecting hole 261. In this application, the structure, size, and connection method (such as bolt connection, pin connection, etc.) of the moving part 201 may vary depending on the application scenario. The connecting hole 261 on the connecting rod 26 can be designed according to the specific requirements of the moving part 201 (such as hole diameter, hole position distribution, hole type, etc.), avoiding the limitation of the pull rod 22's own size or shape when directly machining the connection structure on the pull rod 22, thus enhancing the adaptability of the stroke compensation mechanism 20 to different moving parts 201. In addition, in this application, the connecting rod 26 can reduce the machining complexity of the pull rod 22 and improve the reliability of the stroke compensation mechanism 20. If the moving part 201 needs to be finely adjusted in its installation position (such as a slight axial or radial offset), it can be achieved by replacing the connecting rod 26 of a different size or adjusting the machining accuracy of the connecting hole 261. There is no need to adjust the structure of the tie rod 22, which reduces the overall design change cost caused by changes in connection requirements.

[0041] Furthermore, the connecting rod 26 can also reduce the impact generated by the moving parts 201 during movement, prevent these forces from acting directly on the connection between the pull rod 22 and the guide sleeve 25, reduce fatigue damage to the pull rod 22, and protect its core function in stroke compensation.

[0042] Furthermore, in actual operation, the extended length of the connecting rod 26 directly corresponds to the basic stroke of the piston 12. By observing the exposed length of the connecting rod 26, the movement position and initial stroke of the piston 12 can be quickly determined without the need for additional sensors or measuring tools, simplifying the real-time monitoring of the basic stroke of the stroke compensation mechanism 20. Moreover, the connecting rod 26, as the direct carrier of the compensation operation, improves the convenience of stroke compensation. The design of the connecting rod 26 avoids external forces acting directly on the pull rod 22, extending the service life of the pull rod 22. Compared to directly transmitting stroke through the pull rod 22, the rigid structure of the connecting rod 26 can transmit motion and force more stably, avoiding stroke errors caused by loose connections. Especially during the position holding phase after compensation, the connecting rod 26 can stably support the external load through the preload of the elastic element 23.

[0043] Furthermore, the connecting rod 26 and the pull rod 22 are connected by a thread, which reduces the difficulty of operation when the connecting rod 26 needs to be replaced. In addition, in this application, the connecting hole 261 can be a smooth hole or a threaded hole, and a bearing 30 can be installed in the connecting hole 261. This arrangement can reduce frictional resistance and reduce wear on the moving parts 201 and the connecting rod 26. Moreover, the bearing 30 can also compensate for installation deviations, improve motion stability, ensure motion accuracy, and distribute force, preventing deformation and cracking of the connecting hole 261 due to excessive local stress. In addition, this arrangement also increases the aesthetics of the connecting rod 26.

[0044] Furthermore, a chamfer 262 is provided between the side of the connecting rod 26 near the guide sleeve 25 and the side of the connecting hole 261, making the thickness of the connecting rod 26 at the location of the connecting hole 261 less than the thickness of the connecting rod 26 away from the connecting hole 261. This design reduces the thickness at the location of the connecting hole 261, allowing for better adaptation to and docking with the moving part 201, reducing assembly difficulty and minimizing assembly interference caused by dimensional incompatibility. In addition, appropriately reducing the thickness reduces the overall weight of the connecting rod 26, making the equipment more flexible and responsive during operation. The chamfer 262 on the connecting rod 26 also makes the cross-sectional change of the connecting rod 26 smoother and the stress distribution more uniform, thereby reducing stress concentration and improving the fatigue resistance and service life of the connecting rod 26.

[0045] like Figures 1 to 3 As shown, the end of the connecting part 21 near the piston rod 13 is screwed into the piston rod 13. The threaded connection allows the connecting part 21 and the piston rod 13 to be installed in stages, eliminating the need for irreversible processes such as welding or riveting. This facilitates adjustment of their relative positions during assembly (e.g., fine-tuning the axial depth by rotation) to meet dimensional matching requirements under different working conditions. When the connecting part 21, piston rod 13, or related components (such as the elastic element 23 and pull rod 22 in the stroke compensation mechanism 20) experience wear or failure, they can be quickly separated by disassembling the threads, allowing for individual replacement of damaged parts and avoiding complete scrapping, thus reducing maintenance costs and downtime. Furthermore, the threaded connection, through the self-locking characteristics of the helical pair, provides stable axial force and shear resistance, ensuring that the connecting part 21 and the piston rod 13 do not loosen relative to each other during movement (e.g., when the piston rod 13 extends or retracts, or when the stroke compensation mechanism 20 is under stress), guaranteeing effective force transmission.

[0046] See you again Figures 1 to 3As shown, a notch 212 is provided on the outer wall of the connecting part 21 near the piston rod 13, and the notch 212 extends radially along the connecting part 21. When the connecting part 21 is rigidly connected to the piston rod 13, the notch 212 provides a reliable force application point for installation tools (such as wrenches), ensuring the stability of the connection; reducing assembly difficulty and improving operational convenience. In addition, the notch 212 can also avoid damage to the body of the connecting part 21, and the notch 212 can be formed by conventional machining methods such as milling and grinding, without complex processes, and has minimal impact on the overall strength of the connecting part 21.

[0047] like Figure 2 As shown, the piston rod 13 has a threaded hole 131 at the end opposite to the piston 12. The threaded hole 131 has a predetermined gap with the piston rod 13 and the connecting part 21 at the screw connection point. The connecting part 21 has a through hole 213 extending axially along the connecting part 21 at the end near the piston rod 13. The two ends of the through hole 213 communicate with the threaded hole 131 and the cavity 211, respectively. This configuration results in a solid structure at the end of the piston rod 13 near the piston 12 and a hollow structure at the end near the connecting part 21. The connecting part 21 is screwed into the hollow space, making full use of the hollow space and avoiding structural redundancy caused by external connections. The two ends of the through hole 213 communicate with the threaded hole 131 and the cavity 211, balancing the flow of media between the cavity 211 and the outside, and preventing air resistance or abnormal pressure.

[0048] For example, when the piston rod 13 extends or retracts, or when the stroke compensation mechanism 20 operates, the volume of the cavity 211 may change, causing internal pressure fluctuations. The through hole 213 can communicate with the outside through the threaded hole 131 (or the opening and closing can be controlled by a sealing bolt), preventing the internal pressure of the cavity 211 from being too high (e.g., due to the thermal expansion of hydraulic oil) or too low (e.g., the formation of a vacuum), thus protecting the seals and the connecting structure. Furthermore, the combination of the through hole 213 and the threaded hole 131 adds an "external-internal" interaction channel to the mechanism without increasing the radial dimension excessively, making the functions of the piston rod 13 and the connecting part 21 more integrated. In this application, the assembly status inside the cavity 211 can also be observed through the through hole 213 (e.g., whether the elastic element 23 is installed in place, whether the pull rod 22 is centered), or the internal dimensions can be detected using a special tool (e.g., a probe), without disassembling the connected components, thus improving the efficiency of assembly quality control.

[0049] like Figures 1 to 3As shown, a mounting portion 14 is provided on the end of the cylinder body 11 away from the stroke compensation mechanism 20. The mounting portion 14 has a mounting hole 141, the axis of which is parallel to the axis of the connecting hole 261. This arrangement ensures that the mounting reference of the main body 10 and the stroke compensation mechanism 20 is consistent, improving overall assembly accuracy. This, in turn, ensures that the extension / retraction direction of the piston rod 13, the movement direction of the stroke compensation mechanism 20, and the force direction of the load remain parallel, reducing the risk of "jamming" and "deviation" during movement and ensuring the accuracy of stroke compensation. When the cylinder body 11 operates, the extension / retraction of the piston rod 13 generates a reaction force, and the stroke compensation mechanism 20 also experiences a reaction force when driving the load. The parallelism between the axes of the mounting hole 141 and the connecting hole 261 keeps the lines of action of these two forces parallel, reducing additional torque and extending the service life of the components. Furthermore, the parallelism between the axis of the mounting hole 141 and the axis of the connecting hole 261 simplifies installation and improves assembly efficiency.

[0050] As can be seen from the above embodiments, the linear travel compensation mechanism 100 provided in this application has at least the following technical effects:

[0051] This application provides a stroke compensation mechanism 20, which can compensate for the stroke without damaging the equipment 200 when the control accuracy is not high or the linear stroke is insufficient.

[0052] Recombined Figures 1 to 5 As shown, this application also provides a device 200, which includes the aforementioned linear travel compensation structure 100. Therefore, the device 200 provided in this embodiment includes all the technical effects of the aforementioned linear travel compensation structure 100. The technical effects of the linear travel compensation structure 100 have been described in detail above and will not be repeated here.

[0053] For example, in this application, the device 200 can be industrial automation and manufacturing equipment, transportation equipment, energy and heavy-duty machinery, etc. Figure 5 The illustration shows the application of the linear travel compensation structure 100 of this application to a door lock device. The door rotates about a door hinge mechanism, with the cylinder 11 (e.g., an electric cylinder) in the main body 10 providing rotational power. When the door rotates to the closing position, it cannot fully close due to the influence of the sealing ring behind the door. The door locking mechanism overcomes the elasticity of the sealing ring to complete the final door closing action, requiring the electric cylinder to generate an additional stroke. At this time, the linear travel compensation structure 100 of this application will automatically compensate for this closing stroke.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0056] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. Linear stroke compensation arrangement, which linear stroke compensation arrangement (100) is intended at least for connection with a moving part (201), characterised in that, The linear travel compensation structure (100) includes: The main body (10) includes a cylinder (11), a piston (12) and a piston rod (13). The piston (12) is movably disposed inside the cylinder (11). The piston rod (13) is connected to the piston (12) and passes through one side of the cylinder (11) and extends to the outside of the cylinder (11). The stroke compensation mechanism (20) includes a connecting part (21), a pull rod (22), and an elastic element (23). One end of the connecting part (21) is connected to the piston rod (13). A cavity (211) is provided on the connecting part (21). The pull rod (22) is at least partially movably disposed in the cavity (211), and the end of the pull rod (22) away from the piston rod (13) extends out of the cavity (211). The pull rod (22) is coaxially disposed with the piston rod (13). A limiting part (221) is provided at one end of the pull rod (22) disposed in the cavity (211). The elastic element (23) is sleeved on the outer periphery of the pull rod (22). The two ends of the elastic element (23) abut against the limiting part (221) and the side wall of the cavity (211) away from the limiting part (221), respectively. The end of the connecting part (21) near the piston rod (13) is screwed into the piston rod (13); A notch (212) is provided on the outer side wall of the connecting part (21) near the piston rod (13), and the notch (212) extends in the radial direction of the connecting part (21).

2. The linear travel compensation structure according to claim 1, characterized in that, The stroke compensation mechanism (20) also includes a limiting seat (24), which is connected to the connecting part (21) and located on the side of the cavity (211) away from the cylinder (11). The end of the pull rod (22) away from the piston rod (13) passes through the limiting seat (24) and can move relative to the limiting seat (24). The two ends of the elastic element (23) abut against the limiting part (221) and the limiting seat (24) respectively.

3. The linear stroke compensation structure according to claim 2, characterized in that, The limiting seat (24) is screwed to the connecting part (21) and is located on the side of the cavity (211) away from the cylinder (11).

4. The linear travel compensation structure according to claim 1, characterized in that, The stroke compensation mechanism (20) also includes a guide sleeve (25), one end of the pull rod (22) away from the piston rod (13) passes through the guide sleeve (25) and is fixedly connected to the guide sleeve (25), and the guide sleeve (25) is at least partially sleeved on the side of the connecting part (21) away from the cylinder body (11).

5. The linear stroke compensation structure according to claim 4, characterized in that, The stroke compensation mechanism (20) also includes a connecting rod (26), one end of which is fixedly connected to one end of the pull rod (22) that passes through the guide sleeve (25). The connecting rod (26) is provided with a connecting hole (261), and the moving part (201) is connected to the connecting rod (26) through the connecting hole (261).

6. The linear travel compensation structure according to claim 1, characterized in that, The piston rod (13) is provided with a threaded hole (131) at the end away from the piston (12). The threaded hole (131) has a predetermined gap with the piston rod (13) and the connecting part (21) at the screw connection. The connecting part (21) is provided with a through hole (213) extending along the axial direction of the connecting part (21) at one end near the piston rod (13). The two ends of the through hole (213) are respectively connected to the threaded hole (131) and the cavity (211).

7. The linear travel compensation structure according to claim 5, characterized in that, The cylinder body (11) is provided with a mounting part (14) at the end away from the stroke compensation mechanism (20), and the mounting part (14) is provided with a mounting hole (141), the axis of the mounting hole (141) being parallel to the axis of the connecting hole (261).

8. A device, characterized in that, The device (200) includes the linear travel compensation structure (100) according to any one of claims 1 to 7.

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