Rotary short-stroke air cylinder

Abstract

The utility model discloses a rotary short-stroke air cylinder which comprises a sleeve, a piston rod, a piston and a rotary air cylinder. The piston rod is connected with the piston and penetrates out of a sleeve shaft hole, and air inlets and air outlets are formed in the two sides of the sleeve to achieve linear motion. One end of the rotating rod is connected with the rotating piston, the other end of the rotating rod is connected with the piston rod, air is controlled to enter and exit from the cavity through an air inlet hole and an air outlet hole in the cylinder body, the rotating piston is driven to drive the rotating rod, and rotation of the piston rod is achieved. The cylinder breaks through a traditional single motion mode, endows a linear and rotary composite motion function, can operate workpieces at multiple angles in scenes such as automatic assembly and precision machining, and improves the operation flexibility and precision; and meanwhile, the structure is simplified, transmission parts are reduced, the equipment complexity, cost and energy loss are reduced, the motion precision and stability are improved, the requirement of modern industry for multi-functionalization of execution elements is met, and wide application prospects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of cylinder technology, specifically a rotary short-stroke cylinder. Background Technology

[0002] Short-stroke cylinders, with their compact structure and rapid response, are widely used in many fields such as industrial automation equipment, precision instruments, and medical devices. In various mechanical devices, short-stroke cylinders mainly control the entry and exit of gas through the air inlet and outlet ports on both sides of the sleeve, pushing the piston to slide within the sleeve cavity, thereby driving the piston rod to achieve linear extension and retraction motion to complete tasks such as material clamping, component positioning, and precise pushing.

[0003] However, with the rapid development of modern industrial technology, the functional requirements of actuators in production processes are becoming increasingly diverse and complex. In some precision operation scenarios, such as raw material conveying, precision assembly of electronic components, and multi-angle machining of small parts, it is not only necessary for cylinders to achieve short-stroke linear reciprocating motion, but also urgently required to achieve piston rod rotational motion in order to perform multi-directional operation and processing of workpieces. Existing short-stroke cylinders have a relatively simple structure, only possessing linear motion function and lacking an effective rotary drive mechanism, which cannot meet the multi-functional requirements of such complex processes. When the piston rod needs to rotate in actual operation, traditional short-stroke cylinders can only achieve this through additional complex transmission devices. This not only increases the structural complexity and cost of the equipment, but also easily leads to transmission errors, reducing motion accuracy and equipment operation stability. Therefore, it is urgent to design a short-stroke cylinder that can directly achieve piston rod rotation while ensuring motion accuracy and stability to meet the ever-evolving needs of modern industry. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a rotary short-stroke cylinder.

[0005] The technical solution adopted by this utility model is: a rotary short-stroke cylinder, including a sleeve, a piston rod and a piston, wherein the piston is slidably and sealed to the inner cavity of the sleeve, one end of the piston rod is fixedly connected to the piston, and the other end extends toward one end of the sleeve and passes through the shaft hole of the sleeve, and the sleeve is provided with air inlet and outlet ports on both sides, and also includes a rotary cylinder, which is used to drive the piston rod to rotate;

[0006] The rotary cylinder includes a cylinder body, a rotary piston, and a rotating rod. The cylinder body has a cavity for accommodating the rotary piston. One end of the rotating rod extends into a rotating hole on one side of the cylinder body and connects to the rotary piston, while the other end connects to the piston rod. The rotating rod is rotaryly sealed with the rotating hole on the cylinder body. The cylinder body is provided with an air inlet and an air outlet that communicate with the cavity.

[0007] Furthermore, the cylinder body includes an upper cylinder body and a lower cylinder body, the upper cylinder body, the lower cylinder body shaft and the sleeve are connected in sequence, and the upper cylinder body and the lower cylinder body are axially spaced with fixing holes for fixing the upper cylinder body and the lower cylinder body.

[0008] The upper cylinder, lower cylinder, and sleeve are provided with fixing holes 2 at axial intervals for fixing the upper cylinder, lower cylinder, and sleeve together.

[0009] Furthermore, the lower cylinder body is provided with a protruding shaft portion, and the end of the sleeve away from the shaft hole is provided with an opening for connecting with the shaft portion of the lower cylinder body. A sealing bushing is fitted between the opening and the shaft portion, and sealing rings are provided on the inner and outer sides of the sealing bushing.

[0010] Furthermore, the lower cylinder body is provided with the aforementioned rotating hole one, and the upper cylinder body is provided with a rotating hole two that is rotatably connected to the rotating rod.

[0011] Furthermore, a positioning block is also provided in the cavity of the upper cylinder and the lower cylinder. One side of the positioning block is provided with a geometric surface that cooperates with the contact surface of the rotating piston to limit the rotatable angle of the rotating piston.

[0012] Furthermore, the pins on both sides of the positioning block are connected to the pin holes on the upper and lower cylinder bodies.

[0013] Furthermore, the geometric surface is the limiting surface on both sides of the positioning block, and the included angle between the limiting surfaces is 60-270 degrees.

[0014] Furthermore, a connecting surface is provided on one end of the rotating rod that connects to the piston rod, and a connecting groove is provided on the other end of the piston rod that connects to the rotating rod. After the connecting surface is connected into the connecting groove, it fits against the side of the connecting groove to prevent the piston rod and the rotating rod from rotating relative to each other.

[0015] Furthermore, it also includes a return spring fitted onto the piston rod.

[0016] The beneficial effects of this utility model are:

[0017] Firstly, the newly added rotary cylinder is directly connected to the piston rod, enabling precise rotation of the piston rod and giving the cylinder a combined function of linear and rotary motion. For example, in the process of raw material conveying, if linear conveying followed by rotation is required to unload the material, the conveying angle can be adjusted by rotating the piston rod to unload the material attached to the piston rod container. This improves the flexibility and accuracy of operations, effectively meeting the needs of multi-directional operation in refined work scenarios and broadening the application areas of short-stroke cylinders.

[0018] Secondly, this design avoids the drawbacks of traditional methods that rely on additional complex transmission devices to rotate the piston rod. Reducing transmission components means lowering the structural complexity of the equipment, making the overall structure more compact and concise. This not only saves installation space but also reduces manufacturing and maintenance costs. Simultaneously, the reduction in transmission links lowers energy loss during transmission, effectively improving equipment operating efficiency. Furthermore, it reduces transmission errors caused by wear and loosening of transmission components, significantly improving motion accuracy and equipment stability, thus ensuring the reliability of the production process and product quality.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the piston rod and the rotating rod.

[0023] Figure 4 This is a schematic diagram of an explosion of a rotary cylinder.

[0024] Figure 5 This is a schematic diagram of a rotating cylinder explosion from another perspective.

[0025] Figure 1-5 In the middle section: 1. Sleeve; 2. Piston rod; 3. Piston; 4. Inner cavity; 5. Shaft hole; 6. Air inlet and outlet; 7. Rotary cylinder; 8. Cylinder body; 9. Rotary piston; 10. Rotating rod; 11. Cavity; 12. Rotary hole one; 13. Air inlet; 14. Air outlet; 15. Upper cylinder body; 16. Lower cylinder body; 17. Fixing hole one; 18. Fixing hole two; 19. Shaft; 20. Opening; 21. Sealing bushing; 22. Sealing ring; 23. Rotary hole two; 24. Positioning block; 25. Pin; 26. Pin hole; 27. Limiting surface; 28. Connecting surface; 29. ​​Connecting groove; 30. Return spring; 31. Geometric surface. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] This utility model provides a rotary short-stroke cylinder.

[0029] In this embodiment, refer to Figure 1-5 The rotary short-stroke cylinder includes a sleeve 1, a piston rod 2 and a piston 3. The piston is slidably and sealed to the inner cavity 4 of the sleeve. One end of the piston rod 2 is fixedly connected to the piston, and the other end extends to one end of the sleeve and passes through the shaft hole 5 of the sleeve. The sleeve is provided with air inlet and outlet ports 6 on both sides. It also includes a rotary cylinder 7, which is used to drive the piston rod to rotate.

[0030] The rotary cylinder includes a cylinder body 8, a rotary piston 9, and a rotating rod 10. The cylinder body has a cavity 11 for accommodating the rotary piston. One end of the rotating rod extends into the rotary hole 12 on one side of the cylinder body and connects to the rotary piston, while the other end connects to the piston rod. The rotating rod is rotaryly sealed with the rotary hole 1 on the cylinder body. The cylinder body is provided with an air inlet 13 and an air outlet 14 that communicate with the cavity.

[0031] This rotary short-stroke cylinder's basic structure includes a sleeve, piston rod, and piston. The piston slides and seals within the sleeve's inner cavity. The piston rod connects to the piston and extends through the sleeve's shaft hole. Air inlets and outlets on both sides of the sleeve control the piston's linear motion. A rotary cylinder is added, its internal cavity housing the rotary piston. One end of a rotating rod connects to the rotary piston, and the other end connects to the piston rod, with the rotating rod and cylinder's rotating hole providing a rotary seal. When gas enters the cavity through the inlet, it pushes the rotary piston, causing the rotating rod to rotate, thus rotating the piston rod. Similarly, gas can enter through the outlet, which also serves as the outlet, allowing for forward and reverse rotation of the piston rod. Linear motion is achieved by the gas within the sleeve driving the piston and piston rod, while rotary motion is driven by the rotary cylinder; the two are independent yet can work together.

[0032] The aforementioned technical solution endows the cylinder with a combined linear and rotary motion function, breaking through the limitations of the single motion mode of traditional short-stroke cylinders. In fields such as automated assembly and precision machining, it enables multi-angle and multi-directional operation of workpieces. For example, in the welding of small parts, the piston rod can first move linearly to the welding position, and then rotate to adjust the angle to complete complex welding processes, significantly improving operational flexibility and accuracy, broadening the application range of cylinders in high-end manufacturing, and meeting the modern industrial demand for multi-functional actuators.

[0033] Specifically, the cylinder body includes an upper cylinder body 15 and a lower cylinder body 16. The upper cylinder body 15, the lower cylinder body shaft 16 and the sleeve 1 are connected in sequence. The upper cylinder body and the lower cylinder body are axially spaced and provided with fixing holes 17 for fixing the upper cylinder body and the lower cylinder body.

[0034] The upper cylinder, lower cylinder, and sleeve are provided with fixing holes 18 at axial intervals for fixing the upper cylinder, lower cylinder, and sleeve together.

[0035] In this embodiment, the cylinder body consists of an upper cylinder body and a lower cylinder body. The upper cylinder body, lower cylinder body, and sleeve are connected and fixed through fixing hole one and fixing hole two. Fixing hole one is used to securely connect the upper cylinder body and lower cylinder body, ensuring the stability of the cylinder body structure; fixing hole two is used to connect the upper cylinder body, lower cylinder body, and sleeve into a whole, ensuring a stable connection between the rotary cylinder and the basic cylinder structure. During assembly, bolts and other connecting parts are passed through the fixing holes to tightly fix the components, ensuring that the entire cylinder maintains structural integrity during operation and preventing loosening of components from affecting motion accuracy and stability.

[0036] This connection method enhances the stability and reliability of the overall cylinder structure, effectively preventing movement deviations and equipment failures caused by loose components. Furthermore, the coaxial arrangement of the cylinder body and sleeve allows for modular and miniaturized product design.

[0037] Specifically, the lower cylinder body is provided with a protruding shaft portion 19, and the sleeve is provided with an opening 20 at the end away from the shaft hole to connect with the shaft portion of the lower cylinder body. A sealing bushing 21 is fitted between the opening and the shaft portion, and sealing rings 22 are provided on the inner and outer sides of the sealing bushing 21.

[0038] In this embodiment, the lower cylinder body is provided with a protruding shaft portion, and the corresponding end of the sleeve is provided with an opening. The sealing sleeve is fitted between the shaft portion and the opening, and sealing rings are installed on both the inner and outer sides of the sealing sleeve. The sealing sleeve plays a supporting and sealing role, ensuring the coaxiality of the lower cylinder body and the sleeve, making the connection between the rotary cylinder and the base cylinder more stable; the sealing ring, through its own elastic deformation, tightly fits the shaft portion and the inner wall of the sleeve opening, preventing gas leakage from the connection, ensuring stable gas pressure in the rotary cylinder cavity, and ensuring the normal operation of the rotary piston.

[0039] Specifically, the lower cylinder body is provided with the aforementioned rotating hole one, and the upper cylinder body is provided with rotating hole two 23 that is rotatably connected to the rotating rod.

[0040] In this embodiment, the lower cylinder is provided with a first rotating hole for one end of the rotating rod to extend into and connect with the rotating piston; the upper cylinder is provided with a second rotating hole to realize the rotational connection between the rotating rod and the upper cylinder.

[0041] Specifically, a positioning block 24 is also provided in the cavity of the upper cylinder and the lower cylinder. A geometric surface 31 is provided on one side of the positioning block 24 to cooperate with the contact surface of the rotating piston, thereby limiting the rotatable angle of the rotating piston.

[0042] In this embodiment, positioning blocks are installed within the upper and lower cylinder cavities of the rotary cylinder, with one geometric surface of the positioning block engaging with the contact surface of the rotary piston. When the rotary piston rotates within the cavity under gas pressure, it moves to a position where it contacts the geometric surface of the positioning block. The positioning block then restricts its continued rotation, thereby limiting the rotatable angle of the rotary piston. By designing geometric profiles of different shapes and angles, the rotational angle range of the rotary piston can be precisely controlled, thereby controlling the rotational angle of the piston rod.

[0043] Specifically, the pins 25 on both sides of the positioning block are connected to the pin holes 26 on the upper and lower cylinder bodies.

[0044] In this embodiment, the pins on both sides of the positioning block are connected to the pin holes on the upper and lower cylinder bodies for assembling the positioning block, which facilitates the assembly and disassembly of the positioning block.

[0045] Specifically, the geometric surface is the limiting surface 27 on both sides of the positioning block, and the included angle between the limiting surface 27 and the limiting surface 27 is 60-270 degrees.

[0046] In this embodiment, the included angle between the limiting surfaces on both sides of the positioning block is set between 60 and 180 degrees. By adjusting this angle, the maximum rotation angle range of the rotating piston can be changed, thereby achieving flexible adjustment of the piston rod rotation angle. Different included angles correspond to different rotation angle ranges. In practical applications, a positioning block with a suitable included angle can be selected according to the specific work task requirements to meet diverse process requirements. In this application, the limiting surfaces are 180 degrees apart.

[0047] Specifically, a connecting surface 28 is provided on one end of the rotating rod that connects to the piston rod, and a connecting groove 29 is provided on one end of the piston rod that connects to the rotating rod. After the connecting surface is connected into the connecting groove, it fits against the side of the connecting groove to prevent the piston rod and the rotating rod from rotating relative to each other.

[0048] In this embodiment, a connecting surface is provided at the connection end of the rotating rod and the piston rod, and a connecting groove is provided at the corresponding end of the piston rod. The connecting surface is embedded into the connecting groove and fits against the side of the groove. This structural design utilizes the tight fit between the connecting surface and the side of the connecting groove to form a mechanical limit, preventing relative rotation between the rotating rod and the piston rod, ensuring that the rotational motion of the rotating rod can be completely and accurately transmitted to the piston rod, so that the two maintain synchronous rotation. This meets the requirement of quick assembly and disassembly of the rotating rod and the piston rod.

[0049] Specifically, it also includes a return spring 30 mounted on the piston rod.

[0050] In this embodiment, a return spring is fitted onto the piston rod for piston reset. One end of the return collar abuts against the piston, and the other end abuts against the sleeve.

[0051] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A rotary short-stroke cylinder, comprising a sleeve, a piston rod, and a piston, wherein the piston is slidably and sealingly connected to the inner cavity of the sleeve, one end of the piston rod is fixedly connected to the piston, and the other end extends toward one end of the sleeve and passes through the shaft hole of the sleeve, and inlet and outlet ports are provided on both sides of the sleeve, characterized in that: It also includes a rotary cylinder, which is used to drive the piston rod to rotate; The rotary cylinder includes a cylinder body, a rotary piston, and a rotating rod. The cylinder body has a cavity for accommodating the rotary piston. One end of the rotating rod extends into a rotating hole on one side of the cylinder body and connects to the rotary piston, while the other end connects to the piston rod. The rotating rod is rotaryly sealed with the rotating hole on the cylinder body. The cylinder body is provided with an air inlet and an air outlet that communicate with the cavity.

2. The rotary short-stroke cylinder according to claim 1, characterized in that: The cylinder body includes an upper cylinder body and a lower cylinder body. The upper cylinder body, the lower cylinder body shaft and the sleeve are connected in sequence. The upper cylinder body and the lower cylinder body are provided with fixing holes at axial intervals for fixing the upper cylinder body and the lower cylinder body. The upper cylinder, lower cylinder, and sleeve are provided with fixing holes 2 at axial intervals for fixing the upper cylinder, lower cylinder, and sleeve together.

3. The rotary short-stroke cylinder according to claim 2, characterized in that: The lower cylinder body is provided with a protruding shaft portion. The end of the sleeve away from the shaft hole is provided with an opening for connecting with the shaft portion of the lower cylinder body. A sealing bushing is fitted between the opening and the shaft portion. Sealing rings are provided on the inner and outer sides of the sealing bushing.

4. The rotary short-stroke cylinder according to claim 2, characterized in that: The lower cylinder body is provided with the aforementioned rotating hole one, and the upper cylinder body is provided with rotating hole two that is rotatably connected to the rotating rod.

5. The rotary short-stroke cylinder according to claim 2, characterized in that: The upper and lower cylinder bodies are also equipped with positioning blocks. One side of the positioning block has a geometric surface that mates with the contact surface of the rotating piston to limit the rotatable angle of the rotating piston.

6. The rotary short-stroke cylinder according to claim 5, characterized in that: The pins on both sides of the positioning block are connected to the pin holes on the upper and lower cylinder bodies.

7. The rotary short-stroke cylinder according to claim 6, characterized in that: The geometric surface is the limiting surface on both sides of the positioning block, and the included angle between the limiting surfaces is 60-270 degrees.

8. The rotary short-stroke cylinder according to claim 1, characterized in that: A connecting surface is provided on one end of the rotating rod that connects to the piston rod, and a connecting groove is provided on the other end of the piston rod that connects to the rotating rod. After the connecting surface is connected into the connecting groove, it fits against the side of the connecting groove to prevent the piston rod and the rotating rod from rotating relative to each other.

9. The rotary short-stroke cylinder according to claim 1, characterized in that: It also includes a return spring fitted onto the piston rod.

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