Corrosion-resistant piston self-adaptive machining centering device

Abstract

The invention relates to the technical field of air cylinders, and discloses a corrosion-resistant piston self-adaptive machining centering device which comprises an air cylinder and further comprises a centering assembly, a piston plate is installed in the air cylinder in a sliding mode, a piston rod is fixedly installed on the right side of the piston plate, and a piston ring is arranged on the circumferential face of the piston plate; the centering assembly comprises a supporting frame, a supporting groove, a centering frame, a centering hole, a centering spring, a rubber ring, a limiting groove, a mounting plate, an elastic telescopic plate and a connecting rod, the supporting frame is fixedly mounted on the left side of the piston plate, the centering frame is slidably mounted on the rear side of the supporting frame, and the supporting groove is formed in the inner wall of the centering frame; the piston rod is limited by the free end of the elastic telescopic plate and cannot continue to move rightwards, the piston rod can be prevented from excessively moving rightwards and stretching out in an over-limit mode, and therefore deviation of the piston ring caused by excessive right movement of the piston rod is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air cylinders, and in particular to a corrosion-resistant piston self-adaptive machining centering device. BACKGROUND

[0002] The compression gas is controlled by the electromagnetic valve to alternately enter the rodless cavity and the rod cavity of the air cylinder, so that a pressure difference is formed on both sides of the piston, the pressure difference drives the piston to reciprocatingly slide along the cylinder barrel, and in turn drives the piston rod connected with the piston to stretch and retract, so as to provide a pushing, pulling and the like power for an external load; the gas in the other gas chamber is synchronously discharged, and a cycle of action is completed.

[0003] The patent with the patent number CN215521457U relates to a piston self-adaptive centering device and belongs to the technical field of air cylinders. The piston self-adaptive centering device comprises a cylinder body, a anti-disengagement structure is arranged at the upper end of the cylinder body, a piston body is arranged in the cylinder body, the piston body comprises a piston bottom plate and a piston rod, the piston bottom plate is fixed at the upper end of the piston rod, an elastic device is arranged at the outer side of the piston bottom plate, a spring pressing plate is arranged at the side of the elastic device, a piston sealing ring is arranged at the side of the spring pressing plate, the piston sealing ring is a floating structure relative to the piston bottom plate, and a movable hole is reserved at the lower end of the cylinder body. The patent solves the problem that the machining and assembly errors easily cause the eccentricity of the piston and the cylinder, and in turn cause the single-side air leakage or the unbalanced friction force to cause the side turning, and the long-time friction between the piston and the cylinder easily causes the wear of the piston and the cylinder, and reduces the service life of the cylinder.

[0004] The above patent solves the problem that the machining and assembly errors easily cause the eccentricity of the piston and the cylinder, and in turn cause the single-side air leakage or the unbalanced friction force to cause the side turning, but when the piston rod of the air cylinder exceeds the limit and extends, the cantilever length of the piston rod greatly increases, the bending deformation of the piston rod increases, the piston ring is easily deviated from the cylinder barrel axis to cause the piston ring to deviate, and under the conditions of high-frequency reciprocation or heavy load, the piston rod without support is easily deformed and broken, and in turn the service life of the air cylinder is shortened, and the air cylinder gas conveying pipe is dragged to cause the air cylinder gas conveying pipe to be damaged and leaked, and high-pressure gas is sprayed to injure people, so a corrosion-resistant piston self-adaptive machining centering device needs to be designed to solve the above problems. SUMMARY

[0005] The application aims at solving the problems in the prior art and provides a corrosion-resistant piston self-adaptive machining centering device.

[0006] In order to achieve the above object, the application adopts the following technical scheme. The application discloses a corrosion-resistant piston self-adaptive machining centering device, which comprises a cylinder and a centering assembly, a piston plate is slidably arranged in the cylinder, a piston rod is fixedly arranged on the right side of the piston plate, and a piston ring is arranged on the circumferential surface of the piston plate; the centering assembly comprises a supporting frame, a supporting groove, a centering frame, a centering hole, a centering spring, a rubber ring, a limiting groove, a mounting plate, an elastic expansion plate and a connecting rod, the supporting frame is fixedly arranged on the left side of the piston plate, the centering frame is slidably arranged on the rear side of the supporting frame, the supporting groove is arranged in the inner wall of the centering frame, the centering hole is arranged on the left side of the centering frame, the centering spring is arranged between the piston plate and the centering frame, the rubber ring is fixedly arranged on the right side of the centering frame, the sealing property between the centering frame and the piston plate can be improved through the rubber ring, the limiting groove is arranged on the circumferential surface of the piston rod, the mounting plate is fixedly arranged at the bottom of the cylinder, the elastic expansion plate is fixedly arranged at the top of the mounting plate, the connecting rod is arranged on the circumferential surface of the piston rod, the elastic expansion plate is used for limiting the piston rod, the centering frame is used for centering the piston ring on the surface of the piston plate, and the piston rod cannot continue to move to the right side due to the limitation of the free end of the elastic expansion plate.

[0007] As a preferred technical scheme of the application, the piston rod slides through the right side of the cylinder, the piston ring is used for improving the sealing property between the piston plate and the cylinder, the centering frame is in contact with the inner wall of the piston ring, and the piston ring can be continuously supported when the centering frame moves to the right side, so that the piston ring is prevented from deviating.

[0008] As a preferred technical scheme of the application, the top of the elastic expansion plate is arranged as an inclined surface, the friction between the piston rod and the elastic expansion plate can be reduced through the arrangement of the inclined surface on the top of the elastic expansion plate, the free end of the elastic expansion plate is in contact with the connecting rod, the right side of the inner wall of the limiting groove is arranged as an inclined surface, the rubber ring can be extruded when the centering frame moves to the right side, and the rubber ring is deformed after being extruded by the centering frame.

[0009] As a preferred technical scheme of the application, the application further comprises a supporting assembly and a protection assembly, the supporting assembly is used for supporting the piston rod, the protection assembly is used for protecting the cylinder, the supporting assembly comprises an elastic expansion block, an annular plate, a linkage plate, a supporting ring and a buffer plate, the supporting ring can be in contact with the piston rod and support the piston rod when the supporting ring moves upward, the elastic expansion block is fixedly arranged on the top of the mounting plate, the annular plate is fixedly arranged on the circumferential surface of the elastic expansion block, the linkage plate is fixedly arranged on the free end of the elastic expansion plate, the supporting ring is fixedly arranged on the top of the free end of the elastic expansion block, and the buffer plate is fixedly arranged on the circumferential surface of the piston rod.

[0010] As a preferred technical scheme of the present application, the supporting assembly further comprises an elastic telescopic rod and a buffer hole, the elastic telescopic rod is fixedly installed on the right side of the air cylinder, and the buffer hole is arranged on the left side of the elastic telescopic rod.

[0011] As a preferred technical scheme of the present application, the supporting ring is provided with a slope on the top, the annular plate is in contact with the linkage plate, the free end of the elastic telescopic rod is in contact with the buffer plate, and the slow leftward movement of the free end of the elastic telescopic rod makes the buffer plate and the piston rod move leftward to reset.

[0012] As a preferred technical scheme of the present application, the protection assembly comprises a cylindrical rod, a gas conveying hole, a hollow block, a protection block, a protection block, an elastic spring rod and a pressing frame, the pressing frame moves leftward to fix the gas conveying pipe by extruding the protection block and the protection block, the cylindrical rod is fixedly installed on the left side of the free end of the elastic telescopic rod, the gas conveying hole is arranged on the top of the air cylinder, the hollow block is fixedly installed on the top of the air cylinder, the protection block is fixedly installed on the top of the air cylinder, the protection block is fixedly installed on the top of the air cylinder, the elastic spring rod is fixedly installed on the top of the air cylinder, and the pressing frame is fixedly installed on the output end of the elastic spring rod.

[0013] As a preferred technical scheme of the present application, the cylindrical rod is in contact with the pressing frame, the left side of the pressing frame is provided with a curved surface, and the protection block and the protection block are both provided with curved surfaces, so that the pressing frame will hit the hollow block to produce vibration when moving leftward. The present application has the following beneficial effects: 1. The present application, by moving the centering frame rightward, can continuously support the piston ring to avoid the piston ring from deviating, the centering frame and the piston ring form a rigid support, directly limiting the radial movement of the ring, thereby avoiding the deviation of the piston ring caused by the gap between the inner wall of the cylinder or the movement fluctuation of the piston plate, ensuring that the ring and the cylinder barrel are aligned, the rubber ring is deformed to enhance the sealing between the piston ring and the piston plate, the rubber ring is deformed to fill the gap between the piston ring and the piston plate when the piston rod is completely reset, and the gas leakage between the two cavities is blocked, which can ensure the stability of the initial sealing state of the cylinder and avoid the loss of power caused by pressure leakage after reset, the free end of the elastic telescopic plate moves upward to reset and contacts the inner wall of the limiting groove to limit the piston rod, so that the piston rod cannot continue to move rightward and is limited by the free end of the elastic telescopic plate, which can prevent the piston rod from moving rightward excessively and extending out of the limit, thereby avoiding the deviation of the piston ring caused by the excessive rightward movement of the piston rod.

[0014] 2. The present application, by moving the supporting ring upward, can contact and support the piston rod, the cantilever of the piston rod is longest at the maximum extension limit, and the supporting ring can reduce the bending deformation of the piston rod to ensure the output position accuracy of the cylinder at the maximum extension limit.

[0015] 3. The invention, by slowly moving the free end of the elastic extension rod to the left side, the buffer plate and the piston rod are slowly moved to the left side to reset, the slow reset can reduce the vibration of the cylinder when it runs and resets, thereby reducing the impact damage to the cylinder, protecting the corrosion-resistant coating and prolonging the service life of the cylinder.

[0016] 4. The invention, by pressing the frame to the left side, the protection block and the protection block are pressed and fixed to the gas pipe, and when the pressing frame is moved to the right side, it will be separated from the contact with the gas pipe and the limiting of the gas pipe will be released. When the pressing frame moves to the left side, it extrudes and fixes the gas pipe, preventing the hose from being dragged when the cylinder resets. When moving to the right, it releases the limiting of the gas pipe and does not hinder the natural deformation of the hose with the cylinder stroke, avoiding the wear and tear of the hose caused by dragging from the source, and preventing the safety hazards caused by the breakage of the hose.

[0017] 5. The invention, when the pressing frame moves to the left side, it will hit the hollow block and produce vibration, the pressing frame will shake off the waste adhered to the surface, thereby avoiding the friction or extrusion of the waste on the surface of the gas pipe, further reducing the risk of pipe wall scratching or damage, and further prolonging the service life of the gas pipe. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure diagram of the invention is shown in the figure; Figure 2 The half-section structure diagram of the cylinder of the invention is shown in the figure; Figure 3 The half-section structure diagram of the center frame of the invention is shown in the figure; Figure 4 The half-section structure diagram of the cylinder of the invention is shown in the figure; Figure 5 The position structure diagram of the piston rod and the buffer plate of the invention is shown in the figure; Figure 6 The position structure diagram of the elastic extension plate and the linkage plate of the invention is shown in the figure; Figure 7 The half-section structure diagram of the elastic extension rod of the invention is shown in the figure.

[0019] In the figure: 1, cylinder; 2, piston rod; 3, piston plate; 4, support frame; 5, support groove; 6, center frame; 7, center hole; 8, center spring; 9, rubber ring; 10, limiting groove; 11, mounting plate; 12, elastic extension plate; 13, connecting rod; 141, elastic extension block; 142, annular plate; 143, linkage plate; 144, support ring; 145, buffer plate; 146, elastic extension rod; 147, buffer hole; 151, cylindrical rod; 152, gas conveying hole; 153, hollow block; 154, protection block; 155, protection block; 156, extension spring rod; 157, pressing frame. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0021] With reference to Figures 1-7 One embodiment of the present application is a corrosion-resistant piston self-adaptive machining centering device, which comprises a cylinder 1 and a centering assembly. A piston plate 3 is slidably installed inside the cylinder 1. A piston rod 2 is fixedly installed on the right side of the piston plate 3. A piston ring is arranged on the circumferential surface of the piston plate 3. The centering assembly comprises a support frame 4, a support groove 5, a centering frame 6, a centering hole 7, a centering spring 8, a rubber ring 9, a limiting groove 10, a mounting plate 11, an elastic expansion plate 12 and a connecting rod 13. The support frame 4 is fixedly installed on the left side of the piston plate 3. The centering frame 6 is slidably installed on the rear side of the support frame 4. The support groove 5 is arranged in the inner wall of the centering frame 6. The centering hole 7 is arranged on the left side of the centering frame 6. The centering spring 8 is arranged between the piston plate 3 and the centering frame 6. The rubber ring 9 is fixedly installed on the right side of the centering frame 6. The rubber ring 9 can increase the sealing performance between the centering frame 6 and the piston plate 3. The limiting groove 10 is arranged on the circumferential surface of the piston rod 2. The mounting plate 11 is fixedly installed on the bottom of the cylinder 1. The elastic expansion plate 12 is fixedly installed on the top of the mounting plate 11. The connecting rod 13 is arranged on the circumferential surface of the piston rod 2. The elastic expansion plate 12 is used for limiting the piston rod 2. The centering frame 6 is used for centering the piston ring on the surface of the piston plate 3. The piston rod 2 cannot continue to move to the right side due to the limitation of the free end of the elastic expansion plate 12. The piston rod 2 can be prevented from excessively moving to the right side and exceeding the extension. The piston ring deviation caused by the excessive right movement of the piston rod 2 can be avoided.

[0022] The piston rod 2 slides through the right side of the cylinder 1. The piston ring is used for improving the sealing performance between the piston plate 3 and the cylinder 1. The centering frame 6 abuts against the inner wall of the piston ring. The centering frame 6 can continuously support the piston ring when the centering frame 6 moves to the right side, so as to avoid the piston ring deviation. The centering frame 6 and the piston ring form a rigid support, which directly limits the radial movement of the ring, so as to avoid the piston ring deviation caused by the gap between the inner wall of the cylinder 1 or the movement fluctuation of the piston plate 3. The centering frame 6 and the piston ring can ensure the centering alignment of the ring and the cylinder barrel.

[0023] The top of the elastic expansion plate 12 is arranged as an inclined surface. The top of the elastic expansion plate 12 arranged as an inclined surface can reduce the friction force when the piston rod 2 contacts the elastic expansion plate 12. The free end of the elastic expansion plate 12 abuts against the connecting rod 13. The right side of the inner wall of the limiting groove 10 is arranged as an inclined surface. The centering frame 6 moves to the right side and can extrude the rubber ring 9. The rubber ring 9 is deformed due to the extrusion of the centering frame 6. When the piston rod 2 is completely reset, the deformation of the rubber ring 9 fills the gap between the piston ring and the piston plate 3. The gas in the two cavities can be blocked from leaking. The initial sealing state of the cylinder 1 can be ensured to be stable. The power loss caused by the pressure leakage after the reset can be avoided.

[0024] When working: When the cylinder 1 works, the compressed gas enters the rod cavity of the cylinder 1 through the electromagnetic valve control, the compressed gas entering the rod cavity of the cylinder 1 pushes the piston plate 3 to move to the left, the piston plate 3 moving to the left drives the piston rod 2 to move to the left, and the piston plate 3 moving to the left drives the support frame 4 to move to the left, the support frame 4 moving to the left drives the centering frame 6 to move to the left, the centering frame 6 moving to the left contacts and extrudes the left inner wall of the cylinder 1, the centering frame 6 is extruded by the reaction force of the cylinder 1 and moves to the right, and the centering frame 6 moving to the right extrudes the centering spring 8, the centering spring 8 is deformed and stores energy under the extrusion of the centering frame 6, and the centering frame 6 moving to the right continuously supports the piston ring to avoid the piston ring from deviating; The centering frame 6 moving to the right extrudes the rubber ring 9, and the rubber ring 9 is deformed under the extrusion of the centering frame 6. The rubber ring 9 is deformed to enhance the sealing between the piston ring and the piston plate 3. When the cylinder 1 works, the compressed gas enters the rod cavity of the cylinder 1 through the electromagnetic valve control, and the compressed gas entering the rod cavity of the cylinder 1 extrudes the piston plate 3 to move to the right, the piston plate 3 moving to the right drives the piston rod 2 to move to the right, and the piston rod 2 moving to the right aligns the free end of the elastic expansion plate 12 with the limiting groove 10. After the limiting groove 10 aligns with the free end of the elastic expansion plate 12, the free end of the elastic expansion plate 12 moves upward under the action of its own elasticity and resets. The free end of the elastic expansion plate 12 moving upward resets contacts the inner wall of the limiting groove 10 and limits the piston rod 2, and the piston rod 2 cannot continue to move to the right under the limitation of the free end of the elastic expansion plate 12.

[0025] Reference Figures 1-7 On the basis of the above embodiment, another embodiment of the application further comprises a supporting assembly and a protection assembly, the supporting assembly is used for supporting the piston rod 2, and the protection assembly is used for protecting the cylinder 1. The supporting assembly comprises an elastic expansion block 141, an annular plate 142, a linkage plate 143, a supporting ring 144 and a buffer plate 145. The elastic expansion block 141 is fixedly installed on the top of the mounting plate 11, the annular plate 142 is fixedly installed on the circumferential surface of the elastic expansion block 141, the linkage plate 143 is fixedly installed on the free end of the elastic expansion plate 12, the supporting ring 144 is fixedly installed on the top of the free end of the elastic expansion block 141, and the buffer plate 145 is fixedly installed on the circumferential surface of the piston rod 2. When the maximum extension limit of the piston rod 2 is the longest cantilever, the supporting ring 144 contacts and supports to reduce the bending deformation of the piston rod 2, and the output position accuracy of the cylinder 1 at the maximum extension limit is ensured.

[0026] The support assembly further comprises an elastic telescopic rod 146 fixedly installed at the right side of the air cylinder 1 and a buffer hole 147 formed at the left side of the elastic telescopic rod 146, and a sealing ring is arranged between the free end and the fixed end of the elastic telescopic rod 146, so as to increase the sealing performance between the free end and the fixed end of the elastic telescopic rod 146.

[0027] The top of the support ring 144 is provided as an inclined surface, the annular plate 142 is in contact with the linkage plate 143, the free end of the elastic telescopic rod 146 is in contact with the buffer plate 145, and the slow leftward movement of the free end of the elastic telescopic rod 146 makes the buffer plate 145 slowly move leftward to reset the piston rod 2, so as to reduce the vibration of the air cylinder 1 during the reset operation, thereby reducing the impact damage to the air cylinder 1, protecting the corrosion-resistant coating and prolonging the service life of the air cylinder 1.

[0028] The protection assembly comprises a cylindrical rod 151, a gas conveying hole 152, a hollow block 153, a protection block 154, a protection block 155, an elastic spring rod 156 and a pressing frame 157, the cylindrical rod 151 is fixedly installed at the left side of the free end of the elastic telescopic rod 146, the gas conveying hole 152 is formed at the top of the air cylinder 1, the hollow block 153 is fixedly installed at the top of the air cylinder 1, the protection block 154 is fixedly installed at the top of the air cylinder 1, the protection block 155 is fixedly installed at the top of the air cylinder 1, the elastic spring rod 156 is fixedly installed at the top of the air cylinder 1, and the pressing frame 157 is fixedly installed at the output end of the elastic spring rod 156. When the left side of the pressing frame 157 moves to reset, it extrudes the fixed gas conveying pipe, so as to prevent the hose from being dragged during the reset of the air cylinder 1, and when it moves rightward for operation, it releases the limiting of the gas conveying pipe, so as to avoid hindering the hose from naturally deforming with the stroke of the air cylinder 1, thereby avoiding the hose abrasion and breakage caused by dragging from the source, and preventing the safety hazards caused by the breakage of the hose.

[0029] The cylindrical rod 151 is in contact with the pressing frame 157, the left side of the pressing frame 157 is provided as a curved surface, the protection block 154 and the protection block 155 are both provided as curved surfaces, and the pressing frame 157 will hit the hollow block 153 to produce vibration when it moves leftward, and the vibration of the pressing frame 157 will shake off the waste adhered to the surface, so as to avoid the waste from rubbing or extruding on the surface of the gas conveying pipe.

[0030] During operation, the upward movement of the free end of the elastic telescopic plate 12 will drive the upward movement of the linkage plate 143, the upward movement of the linkage plate 143 will contact and extrude the annular plate 142, the annular plate 142 will move upward under the extrusion of the linkage plate 143, the upward movement of the annular plate 142 will drive the upward movement of the free end of the elastic telescopic block 141, the upward movement of the free end of the elastic telescopic block 141 will drive the upward movement of the support ring 144, the upward movement of the support ring 144 will contact and support the piston rod 2, and the piston rod 2 will extrude the free end of the elastic telescopic plate 12 when it moves leftward to reset; The free end of the elastic telescopic plate 12 moves downward under the pressure of the piston rod 2. The downward movement of the free end of the elastic telescopic plate 12 will drive the linkage plate 143 to move downward. The downward movement of the linkage plate 143 will disengage from the contact with the annular plate 142. After the annular plate 142 disengages from the contact with the linkage plate 143, the elastic telescopic block 141 drives the support ring 144 to move downward and reset under its own elastic force. At the same time, the piston rod 2 moves to the left and resets, which will drive the buffer plate 145 to move to the left and reset. The buffer plate 145 moves to the left and resets, which will contact the free end of the elastic telescopic rod 146 and squeeze the free end of the elastic telescopic rod 146. The free end of the elastic telescopic rod 146 moves to the left under the pressure of the buffer plate 145. When the free end of the elastic telescopic rod 146 moves to the left, it compresses the gas inside the elastic telescopic rod 146. The gas inside the elastic telescopic rod 146 is compressed by the free end of the elastic telescopic rod 146 and slowly flows out through the buffer hole 147. The slow flow of the gas inside the elastic telescopic rod 146 through the buffer hole 147 causes the free end of the elastic telescopic rod 146 to slowly move to the left. The slow movement of the free end of the elastic telescopic rod 146 to the left causes the buffer plate 145 and the piston rod 2 to slowly move to the left and reset.

[0031] When the free end of the elastic telescopic rod 146 moves to the left to reset, it will cause the cylindrical rod 151 to move to the left. When the cylindrical rod 151 moves to the left, it will contact the pressing frame 157 and squeeze the pressing frame 157. The pressing frame 157 moves to the left under the squeezing of the cylindrical rod 151. The pressing frame 157 moves to the left and squeezes the free end of the telescopic spring rod 156. The free end of the telescopic spring rod 156 retracts and stores force under the squeezing of the pressing frame 157. At the same time, the pressing frame 157 moves to the left to cooperate with the protective block 154 and the protective block 155 to squeeze and fix the gas pipe. When the free end of the elastic telescopic rod 146 moves to the right to reset, it will drive the cylindrical rod 151 to move to the right. The cylindrical rod 151 will disengage from the pressing frame 157 when it moves to the right. After the pressing frame 157 disengages from the cylindrical rod 151, the pressing frame 157 moves to the right and resets under the elastic force of the telescopic spring rod 156. The pressing frame 157 moves to the right and resets, disengaging from the gas pipe and releasing the restriction on the gas pipe. When the pressing frame 157 moves to the left, it will hit the hollow block 153 and cause vibration.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A corrosion-resistant piston self-adapting machining centering device comprising a cylinder (1), characterized in that, It also includes a centering assembly, a supporting assembly and a protection assembly, a piston plate (3) is slidably installed in the cylinder (1), a piston rod (2) is fixedly installed on the right side of the piston plate (3), and a piston ring is arranged on the circumferential surface of the piston plate (3); The centering assembly comprises a supporting frame (4), a supporting groove (5), a centering frame (6), a centering hole (7), a centering spring (8), a rubber ring (9), a limiting groove (10), a mounting plate (11), an elastic expansion plate (12) and a connecting rod (13), the supporting frame (4) is fixedly installed on the left side of the piston plate (3), the centering frame (6) is slidably installed on the rear side of the supporting frame (4), the supporting groove (5) is arranged in the inner wall of the centering frame (6), the centering hole (7) is arranged on the left side of the centering frame (6), the centering spring (8) is arranged between the piston plate (3) and the centering frame (6), the rubber ring (9) is fixedly installed on the right side of the centering frame (6), the limiting groove (10) is arranged on the circumferential surface of the piston rod (2), the mounting plate (11) is fixedly installed on the bottom of the cylinder (1), the elastic expansion plate (12) is fixedly installed on the top of the mounting plate (11), and the connecting rod (13) is arranged on the circumferential surface of the piston rod (2); the elastic expansion plate (12) is used for limiting the piston rod (2), and the centering frame (6) is used for centering the piston ring on the surface of the piston plate (3). The supporting assembly is used for supporting the piston rod (2), and the protection assembly is used for protecting the cylinder (1).

2. A corrosion resistant piston self adaptive machining centering device according to claim 1, wherein, The piston rod (2) slides through the right side of the cylinder (1), the piston ring is used for improving the sealing performance between the piston plate (3) and the cylinder (1), and the centering frame (6) abuts against the inner wall of the piston ring.

3. A corrosion resistant self adaptive machining centering device for a piston as set forth in claim 2, wherein, The top of the elastic expansion plate (12) is inclined, the free end of the elastic expansion plate (12) abuts against the connecting rod (13), and the right side of the inner wall of the limiting groove (10) is inclined.

4. A corrosion resistant piston self adaptive machining centering device according to claim 3, wherein, The supporting assembly comprises an elastic expansion block (141), an annular plate (142), a linkage plate (143), a supporting ring (144) and a buffer plate (145), the elastic expansion block (141) is fixedly installed on the top of the mounting plate (11), the annular plate (142) is fixedly installed on the circumferential surface of the elastic expansion block (141), the linkage plate (143) is fixedly installed on the free end of the elastic expansion plate (12), the supporting ring (144) is fixedly installed on the top of the free end of the elastic expansion block (141), and the buffer plate (145) is fixedly installed on the circumferential surface of the piston rod (2).

5. A corrosion resistant self adaptive machining centering device for a piston as defined in claim 4, wherein, The supporting assembly further comprises an elastic expansion rod (146) and a buffer hole (147), the elastic expansion rod (146) is fixedly installed on the right side of the cylinder (1), the buffer hole (147) is arranged on the left side of the elastic expansion rod (146), and a sealing ring is arranged between the free end and the fixed end of the elastic expansion rod (146).

6. A corrosion resistant piston self adaptive machining centering device according to claim 5, wherein, The top of the supporting ring (144) is inclined, the annular plate (142) contacts the linkage plate (143), and the free end of the elastic expansion rod (146) abuts against the buffer plate (145).

7. A corrosion resistant self adaptive machining centering device for a piston as set forth in claim 6, wherein, Said protection assembly includes cylindrical rod (151), air hole (152), hollow block (153), protection block (154), guard block (155), telescopic spring rod (156) and pressing frame (157), the cylindrical rod (151) is fixedly installed in the left side of the free end of the elastic telescopic rod (146), the air hole (152) is opened in the top of the air cylinder (1), the hollow block (153) is fixedly installed in the top of the air cylinder (1), the protection block (154) is fixedly installed in the top of the air cylinder (1), the guard block (155) is fixedly installed in the top of the air cylinder (1), the telescopic spring rod (156) is fixedly installed in the top of the air cylinder (1), and the pressing frame (157) is fixedly installed in the output end of the telescopic spring rod (156).

8. A corrosion resistant piston self adaptive machining centering device according to claim 7, wherein, The cylindrical rod (151) is in contact with the pressing frame (157), the left side of the pressing frame (157) is provided as an arc surface, and the protection block (154) and the guard block (155) are both provided as arc surfaces.

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