Pre-tightening type piezoelectric induced piston vibration low-friction air cylinder

Abstract

The utility model discloses a pre-tightening type piezoelectric induced piston vibration low-friction air cylinder, which relates to the technical field of air cylinders, and comprises an air cylinder main body and a piston rod, rollers are arranged above two sides of the air cylinder main body, a guide shell is sleeved outside the air cylinder main body, the outer surface of the piston rod is connected with a guide frame, and the bottom of the guide frame is connected with a cover plate. A sliding ring and a sliding sleeve are connected into the cover plate. Through the arrangement of the cover plate, the sliding ring, the sliding sleeve and the guide shell, the piston rod and a sealing piece of the air cylinder body are shielded through the cooperation of the guide frame and the cover plate, and the phenomena that external dust is attached to the sealing piece, friction force is increased, and abrasion is caused are reduced; by arranging a guide shell, the surface of the air cylinder body is smoother so that the cover plate can be guided, the situation that a guide frame and the cover plate deviate due to vibration and collide with the air cylinder body is avoided, and meanwhile friction force between the cover plate and the air cylinder body and friction force between the guide shell and an air pipe are reduced through cooperation of a sliding ring and a sliding sleeve; a certain protection effect is achieved, and meanwhile friction is small.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinders, in particular to a low-friction cylinder with a pre-tightened piezoelectric piston vibration. Background Art

[0002] A cylinder refers to a cylindrical metal part that guides a piston to perform linear reciprocating motion in the cylinder. It usually drives a certain structure to move by pushing the piston through compressed gas. The low-speed creep problem of the cylinder is one of the main factors affecting the control accuracy of the cylinder motion, so low-speed creep can improve the control accuracy of the cylinder. The methods currently commonly used to reduce the low-speed creep phenomenon of the cylinder mainly include: piezoelectric piston vibration, air flotation method, damping method, etc. Among them, piezoelectric piston vibration is to superimpose a high-frequency vibration signal on the control signal, and use the vibration signal to compensate for the friction force.

[0003] A low-friction cylinder with preloaded piezoelectric piston vibration, application number 202121610691.9, comprises a device body, a piston rod is arranged inside the device body, a first rubber pad is arranged on the outside of the piston rod, a piston is installed at the end of the piston rod, a built-in slide groove is arranged inside the device body, a telescopic spring is arranged inside the built-in slide groove, a fixing plate is installed on the outside of the telescopic spring, a placement groove is opened inside the device body, a placement frame is installed inside the placement groove, a piezoelectric stack is installed inside the placement frame, a sliding groove is installed on the outer end of the placement frame, and a protective cover is installed on the top of the placement groove. The utility model discloses a low-friction cylinder with preloaded piezoelectric piston vibration. The overall design is easy to operate and maintain, and the piezoelectric stack is located at the center of the device body, thereby ensuring stable force during vibration and ensuring work efficiency.

[0004] This technical solution supports and guides the piston rod through the cooperation of two arc-shaped snap rings and rubber pads. Although it can effectively reduce the displacement of the piston rod caused by vibration, rubber usually has a large friction, which increases the resistance of the piston rod when it is extended and retracted. At the same time, during vibration, since the rubber pad itself has elasticity, the piston rod will squeeze the rubber pad and deform it. At this time, the piston rod will still have a small range of displacement, and the contact pressure between the two increases when the piston rod squeezes the rubber, which further increases the friction, thereby increasing the resistance of the piston rod when it is extended and retracted. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a low-friction cylinder with a pre-tightened piezoelectric piston vibration, so as to solve the technical problem that the setting of the supporting guide structure increases the friction force.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pre-tightened piezoelectric low-friction cylinder with piston vibration, comprising a cylinder body and a piston rod, rollers are installed on the upper sides of the cylinder body, a guide shell is sleeved on the outside of the cylinder body, a guide frame is connected to the outer surface of the piston rod, and a cover plate is connected to the bottom of the guide frame, and a slip ring and a sliding sleeve are respectively connected to the inside of the cover plate.

[0007] By adopting the above technical scheme, the piston rod drives the guide frame to move during the extension and retraction process, thereby avoiding the deviation of the piston rod due to vibration. The guide frame contacts the roller to force the roller to rotate, thereby reducing the friction force that increases the extension and retraction resistance of the piston rod when the guide frame supports and guides the piston rod. The guide frame cooperates with the cover plate to shield the seals of the piston rod and the cylinder body, thereby reducing the phenomenon of external dust adhering to the seals to increase friction and wear. The setting of the guide shell makes the surface of the cylinder body smoother to facilitate guiding the cover plate, thereby avoiding the deviation of the guide frame and the cover plate due to vibration and colliding with the cylinder body. At the same time, the cooperation of the slip ring and the sliding sleeve reduces the friction between the cover plate and the cylinder body, the guide shell and the air pipe, thereby reducing the resistance.

[0008] Furthermore, the guide frame is in contact with a roller, and a plurality of rollers are provided, and the plurality of rollers are distributed in a ring array.

[0009] By adopting the above technical solution, the piston rod drives the guide frame to move during the extension and retraction process, avoiding vibration that causes the piston rod to deviate. The guide frame contacts the roller and causes the roller to rotate under force, thereby reducing the friction force, so as to reduce the friction force that is large when the guide frame supports and guides the piston rod and increases the extension and retraction resistance of the piston rod.

[0010] Furthermore, the piston rod is connected to the output end of the cylinder body, both sides of the cylinder body are connected to air pipes, and a piezoelectric stack is fixed inside the cylinder body.

[0011] By adopting the above technical solution, one end of the cylinder body without the piston rod is exposed to the outside, so that the staff can install the cylinder body on the equipment through the exposed surface. Then the staff connects the actuator to the end of the piston rod, and then allows compressed gas to enter the cylinder body through the air pipe. Then the piston rod is pushed to reciprocate linearly by compressed gas, so that the actuator performs linear reciprocating motion. At the same time, the piezoelectric stack is started, and the friction force is compensated by the vibration signal, thereby reducing the influence of the piston rod on the control accuracy when it creeps at a low speed.

[0012] Furthermore, the slip ring is slidably connected to the air pipe, and the sliding sleeve is slidably connected to the cylinder body and the guide housing respectively.

[0013] By adopting the above technical solution, the friction between the cover plate and the cylinder body, the guide shell and the air pipe is reduced through the cooperation of the slip ring and the sliding sleeve, thereby reducing the resistance.

[0014] Furthermore, the slip ring and the sliding sleeve are both made of Teflon material.

[0015] By adopting the above technical solution, the slip ring and the sliding sleeve made of Teflon material have a self-lubricating effect, which can reduce friction and reduce resistance.

[0016] Furthermore, a nut is sleeved on the outside of the piston rod, and a bolt penetrates the bottom of the cover plate.

[0017] By adopting the above technical solution, when the guide shell, cover plate, slip ring and sleeve are damaged, the staff will first separate the cylinder body from the equipment body and the executed element, and then the staff will remove the bolts first, and then the cover plate can be removed from the guide frame. At this time, the staff only needs to remove the nuts to remove the guide frame from the piston rod and the cylinder body, and the installation operation is the opposite.

[0018] Furthermore, the nut is threadedly connected to the piston rod, and the guide frame is detachably connected to the piston rod via the nut.

[0019] By adopting the above technical solution, the staff only needs to remove the nut to remove the guide frame from the piston rod and the cylinder body, and the installation operation is the opposite.

[0020] Furthermore, the bolts are threadedly connected to the guide frame, and the cover plate is detachably connected to the guide frame via the bolts.

[0021] By adopting the above technical solution, the staff can remove the cover plate from the guide frame by removing the bolts first. When installing, the cover plate is fitted to the guide frame and then the bolts are screwed in.

[0022] In summary, the utility model mainly has the following beneficial effects:

[0023] 1. The utility model uses the arrangement of the cover plate, the slip ring, the sliding sleeve and the guide housing, and the cooperation of the guide frame and the cover plate to shield the seal of the piston rod and the cylinder body, thereby reducing the phenomenon of external dust adhering to the seal to increase friction and wear. The arrangement of the guide housing makes the surface of the cylinder body smoother to facilitate the guidance of the cover plate, thereby preventing the guide frame and the cover plate from being offset and colliding with the cylinder body due to vibration. At the same time, the cooperation of the slip ring and the sliding sleeve reduces the friction between the cover plate and the cylinder body, the guide housing and the air pipe, thereby reducing resistance. It has a certain protective effect, and the friction is small at the same time.

[0024] 2. The utility model arranges the guide frame and the roller so that the piston rod drives the guide frame to move during the extension and retraction process, thereby avoiding the deviation of the piston rod caused by vibration. The guide frame contacts the roller and causes the roller to rotate under force, thereby reducing the friction force, so as to reduce the friction force that increases the extension and retraction resistance of the piston rod when the guide frame supports and guides the piston rod; the supporting and stabilizing guiding effect is better, and the friction force is reduced to reduce the resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the guide frame of the utility model;

[0027] Figure 3 This is a schematic diagram of the explosion structure of the cylinder body of the utility model;

[0028] Figure 4 It is a schematic diagram of the explosion structure of the guide frame of the utility model.

[0029] In the figure: 1. Cylinder body; 2. Air pipe; 3. Piston rod; 4. Piezoelectric stack; 5. Guide frame; 6. Cover plate; 7. Slip ring; 8. Sliding sleeve; 9. Roller; 10. Guide housing; 11. Bolt; 12. Nut. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0031] The following describes an embodiment of the utility model based on its overall structure.

[0032] Embodiment 1:

[0033] A low friction cylinder with preloaded piezoelectric piston vibration, such as Figure 1-Figure 4As shown, it includes a cylinder body 1 and a piston rod 3. Rollers 9 are installed on both sides of the cylinder body 1. There are multiple rollers 9, which are distributed in a ring array. A guide shell 10 is sleeved on the outside of the cylinder body 1. A guide frame 5 is connected to the outer surface of the piston rod 3. The guide frame 5 is in contact with the roller 9. The piston rod 3 drives the guide frame 5 to move during the extension and retraction process to avoid the piston rod 3 from being offset due to vibration. The guide frame 5 is in contact with the roller 9 to force the roller 9 to rotate, thereby reducing friction. A cover plate 6 is connected to the bottom of the cover plate 6, and the guide frame 5 cooperates with the cover plate 6 to cover the piston rod 3 and the seal of the cylinder body 1; a slip ring 7 and a sliding sleeve 8 are respectively connected to the inside of the cover plate 6, and the slip ring 7 and the sliding sleeve 8 are made of Teflon material. The slip ring 7 is slidably connected to the air pipe 2, and the sliding sleeve 8 is slidably connected to the cylinder body 1 and the guide housing 10 respectively. The cooperation of the slip ring 7 and the sliding sleeve 8 reduces the friction between the cover plate 6 and the cylinder body 1, the guide housing 10 and the air pipe 2, thereby reducing the resistance.

[0034] See also Figure 1-Figure 3 In the above embodiment, the piston rod 3 is connected to the output end of the cylinder body 1, and the cylinder body 1 is connected to the air pipe 2 on both sides. The compressed gas can enter the cylinder body 1 through the air pipe 2, and then the piston rod 3 is pushed to reciprocate linearly by the compressed gas; a piezoelectric stack 4 is fixed inside the cylinder body 1, and the piezoelectric stack 4 is started to compensate for the friction force with the vibration signal, thereby reducing the influence of the piston rod 3 on the control accuracy when creeping at a low speed.

[0035] Embodiment 2:

[0036] On the basis of the above-mentioned embodiment 1, it is convenient to replace the guide housing 10, the cover plate 6, the slip ring 7 and the sliding sleeve 8 which are damaged after long-term use.

[0037] See also Figure 1 and Figure 4 In the above embodiment, a nut 12 is sleeved on the outside of the piston rod 3, and the nut 12 is threadedly connected to the piston rod 3. The guide frame 5 is detachably connected to the piston rod 3 through the nut 12. A bolt 11 passes through the bottom of the cover plate 6, and the bolt 11 is threadedly connected to the guide frame 5. The cover plate 6 is detachably connected to the guide frame 5 through the bolt 11. The staff first removes the bolt 11, and then the cover plate 6 can be removed from the guide frame 5. At this time, the staff only needs to remove the nut 12 to remove the guide frame 5 from the piston rod 3 and the cylinder body 1.

[0038] The implementation principle of the utility model is as follows: first, one end of the cylinder body 1 without the piston rod 3 is exposed to the outside, so that the staff can install the cylinder body 1 on the equipment through the exposed surface, and then the staff connects the end of the piston rod 3 to the actuator, and then allows the compressed gas to enter the cylinder body 1 through the air pipe 2, and then the piston rod 3 is pushed by the compressed gas to reciprocate linearly, so that the actuator performs linear reciprocating motion, and at the same time the piezoelectric stack 4 is started, and the friction force is compensated by the vibration signal, so as to reduce the influence of the piston rod 3 on the control accuracy when the low-speed creeping occurs;

[0039] During the extension and retraction process of the piston rod 3, the guide frame 5 is driven to move, so as to avoid the piston rod 3 being deflected due to vibration. The guide frame 5 contacts the roller 9 to force the roller 9 to rotate, thereby reducing the friction force, so as to reduce the friction force when the guide frame 5 supports and guides the piston rod 3, which increases the extension and retraction resistance of the piston rod 3. At the same time, the guide frame 5 cooperates with the cover plate 6 to cover the seals of the piston rod 3 and the cylinder body 1, so as to reduce the external dust adhering to the seals and the piston rod 3 to increase the friction force and wear. The surface of the cylinder body 1 is made smoother by the setting of the guide shell 10, so as to facilitate the guidance of the cover plate 6, so as to avoid the guide frame 5 and the cover plate 6 being deflected and colliding with the cylinder body 1 due to vibration. At the same time, the friction between the cover plate 6 and the cylinder body 1, the guide shell 10 and the air pipe 2 is reduced by the cooperation of the slip ring 7 and the sliding sleeve 8, thereby reducing the resistance.

[0040] When the guide housing 10, cover plate 6, slip ring 7 and sleeve 8 are damaged, the staff first disassembles the cylinder body 1 from the equipment body and the executed element, and then removes the bolt 11 to remove the cover plate 6 from the guide frame 5. At this time, the staff only needs to remove the nut 12 to remove the guide frame 5 from the piston rod 3 and the cylinder body 1. The installation operation is the opposite.

[0041] Although an embodiment of the utility model has been shown and described, this specific embodiment is only an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A low-friction cylinder with preloaded piezoelectric piston vibration, comprising a cylinder body (1) and a piston rod (3), characterized in that: Rollers (9) are installed above both sides of the cylinder body (1), a guide shell (10) is sleeved on the outside of the cylinder body (1), the outer surface of the piston rod (3) is connected to a guide frame (5), and the bottom of the guide frame (5) is connected to a cover plate (6), and the inside of the cover plate (6) is respectively connected to a slip ring (7) and a slip sleeve (8).

2. The preloaded piezoelectric piston vibration low friction cylinder according to claim 1, characterized in that: The guide frame (5) is in contact with a roller (9), and a plurality of rollers (9) are provided, and the plurality of rollers (9) are distributed in a ring array.

3. The preloaded piezoelectric piston vibration low friction cylinder according to claim 1, characterized in that: The piston rod (3) is connected to the output end of the cylinder body (1), both sides of the cylinder body (1) are connected to air pipes (2), and a piezoelectric stack (4) is fixed inside the cylinder body (1).

4. The preloaded piezoelectric piston vibration low friction cylinder according to claim 3 is characterized in that: The slip ring (7) is slidably connected to the air pipe (2), and the sliding sleeve (8) is slidably connected to the cylinder body (1) and the guide housing (10) respectively.

5. The low-friction cylinder with preloaded piezoelectric piston vibration according to claim 4 is characterized in that: The sliding ring (7) and the sliding sleeve (8) are both made of Teflon material.

6. The preloaded piezoelectric piston vibration low friction cylinder according to claim 1, characterized in that: The piston rod (3) is sleeved with a nut (12) on the outside, and a bolt (11) passes through the bottom of the cover plate (6).

7. The low-friction cylinder with preloaded piezoelectric piston vibration according to claim 6, characterized in that: The nut (12) is threadedly connected to the piston rod (3), and the guide frame (5) is detachably connected to the piston rod (3) via the nut (12).

8. The low-friction cylinder with preloaded piezoelectric piston vibration according to claim 6, characterized in that: The bolts (11) are threadedly connected to the guide frame (5), and the cover plate (6) is detachably connected to the guide frame (5) via the bolts (11).

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