A pneumatic clamping device for boring a thin-walled cylinder liner

Abstract

The present application relates to the technical fields of workpiece clamping, in particular to a kind of thin-walled cylinder liner boring pneumatic clamping device;Including clamping cylinder and the installation ring of clamping cylinder bottom;The inner wall of the clamping cylinder is uniformly provided with clamping groove;The clamping groove is slidably connected with clamping strip;The outer wall of the clamping cylinder is fixedly connected with middle ring pipe;The middle ring pipe is connected with the bottom of clamping groove, and is connected with middle gas pipe;The vertical length direction of the clamping strip is consistent with the axial direction of the clamping cylinder;The length of the clamping strip in the radial direction of the clamping cylinder is greater than the depth of the clamping groove;Adjacent clamping strips are connected by elastic bag in circumferential direction;The elastic bag is connected with the side of the clamping strip and close to the center position of the clamping cylinder;The elastic bag between adjacent clamping strips in circumferential direction is expanded, so that the outer wall of the cylinder liner which is not supported by the clamping strip is tightly contacted by the elastic bag, thereby reducing the deformation of the thin-walled cylinder liner during boring, so that the machining precision of the thin-walled cylinder liner is improved.

Description

Technical Field

[0001] This invention relates to the field of workpiece clamping technology, specifically a pneumatic clamping device for boring thin-walled cylinder liners. Background Technology

[0002] Cylinder liner machining is a precision process designed to ensure the cylinder liner has the correct dimensions and a high-quality surface. First, the raw material undergoes pretreatment before machining, including removing surface contaminants and defects. Then, the cylinder liner is fixed onto the machining equipment, typically a CNC machine tool. In the preliminary machining stage, rough machining removes excess material, preparing for subsequent finish machining. Next, the finish machining stage begins, using high-precision tools to precisely cut the cylinder liner, ensuring the bore diameter, roundness, and surface finish meet design requirements. To further improve machining accuracy, boring is often used, ensuring the inner wall of the cylinder liner reaches the required dimensions after boring.

[0003] During the boring process of cylinder liners, a clamping device is required to clamp the cylinder liner. In order to be suitable for cylinder liners of different diameters, the existing clamping devices have clamping blocks that can extend and retract radially in the cylinder liner. By bringing the clamping blocks close to the center of the cylinder liner, they contact and clamp the outer wall of the cylinder liner. The number of clamping blocks is limited, and there are gaps between adjacent clamping blocks in the circumferential direction. As a result, the outer wall of the cylinder liner to be machined is not completely clamped. The outer wall of the cylinder liner that is not clamped will undergo slight deformation during the boring process, especially for the boring of thin-walled cylinder liners, where the deformation is more obvious, thus affecting the machining accuracy of the cylinder liner.

[0004] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes a pneumatic clamping device for boring thin-walled cylinder liners, which solves the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a pneumatic clamping device for boring thin-walled cylinder liners. This invention expands the elastic bladder between adjacent clamping bars in the circumferential direction, thereby pressing the outer wall of the cylinder liner that is not supported by the clamping bars against the elastic bladder, thereby reducing the deformation of the thin-walled cylinder liner during the boring process and improving the machining accuracy of the thin-walled cylinder liner.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A pneumatic clamping device for boring thin-walled cylinder liners according to the present invention includes a clamping cylinder and a mounting ring at the bottom of the clamping cylinder; clamping grooves are uniformly arranged on the inner wall of the clamping cylinder; a clamping strip is slidably and sealingly connected in the clamping groove; a middle ring tube is fixedly connected to the outer wall of the clamping cylinder; the middle ring tube is connected to the bottom of the clamping groove and to the middle air pipe; the vertical length direction of the clamping strip is consistent with the axial direction of the clamping cylinder; the radial length of the clamping strip in the clamping cylinder is greater than the depth of the clamping groove; adjacent clamping strips in the circumferential direction are fixedly connected by an elastic bladder; the elastic bladder is connected to the side of the clamping strip and close to the center of the clamping cylinder; a first air hole is provided in the clamping strip; one end of the first air hole is connected to the clamping groove and the other end is connected to the elastic bladder; the deflated elastic bladder expands under pressure and fills the gap between adjacent clamping strips.

[0007] Preferably, the end of the clamping strip near the bottom of the clamping groove is connected to the bottom of the clamping groove by a first spring; the elastic bladder expands after the clamping strip extends into the clamping groove; the clamping strip retracts into the corresponding clamping groove after the elastic bladder deflates.

[0008] Preferably, the vertical side of the clamping bar is provided with an inclined groove; an inclined plate is slidably connected in the inclined groove; the inclined plates on both sides of the clamping bar are symmetrically distributed in a figure-eight shape; the inclined plate is connected to the bottom of the inclined groove by a second spring; the end of the inclined plate away from the second spring faces the central axis of the clamping cylinder; the inclined plates on adjacent clamping bars in the circumferential direction extend out of the inclined groove and then contact each other; the distance between the elastic bladder and the central axis of the clamping cylinder is less than the distance between the inclined plate and the central axis of the clamping cylinder.

[0009] Preferably, one of the inclined plates on the clamping bar has a protrusion at the end away from the corresponding second spring; the other inclined plate on the clamping bar has a groove at the end away from the corresponding second spring; the groove is adapted to the shape of the protrusion; the protrusions and grooves at the ends of the inclined plates on the circumferentially adjacent clamping bars are interlocked.

[0010] Preferably, the bottom of the inclined groove is connected to the first air hole; the gas in the first air hole can enter the inclined groove; the inclined plate is slidably sealed to the inclined groove.

[0011] Preferably, the inner wall of the clamping cylinder is provided with an upper baffle groove; the upper baffle groove is located directly above and close to the clamping groove; an upper baffle is slidably and sealingly connected inside the upper baffle groove; an upper ring tube is fixedly connected to the outer wall of the clamping cylinder; the upper ring tube connects to the upper air pipe and the upper baffle groove; the upper baffle is located directly above the corresponding elastic bladder after extending out of the upper baffle groove. The inner wall of the clamping cylinder is provided with a lower baffle groove; the lower baffle groove is located directly below the clamping groove and is close to each other; a lower baffle is slidably and sealingly connected to the lower baffle groove; a lower ring pipe is fixedly connected to the outer wall of the clamping cylinder; the lower ring pipe is connected to the lower air pipe and the lower baffle groove; the lower air pipe and the upper air pipe are connected to the second air pump.

[0012] Preferably, the natural length of the elastic bladder in the circumferential direction of the clamping cylinder is less than the distance between adjacent clamping bars in the circumferential direction of the clamping cylinder; after the clamping bar extends out of the corresponding clamping groove, the elastic bladder is in a stretched state in the circumferential direction of the clamping cylinder.

[0013] Preferably, the thickness of the elastic bladder varies in the vertical direction; the thickness of the elastic bladder in the vertical direction increases as it moves away from the center position.

[0014] The beneficial effects of this invention are as follows: 1. The present invention expands the elastic bladder between adjacent clamping bars in the circumferential direction, thereby pressing the outer wall of the cylinder liner that is not supported by the clamping bars against the elastic bladder, thereby reducing the deformation of the thin-walled cylinder liner during the boring process and improving the machining accuracy of the thin-walled cylinder liner.

[0015] 2. Due to the restriction of the elastic bladder by the inclined plate, the expanded elastic bladder expands towards the outer wall of the cylinder liner after it comes into contact with the side of the inclined plate near the central axis of the clamping cylinder. This causes the outer wall of the cylinder liner to be quickly pressed against, greatly improving the clamping efficiency of the cylinder liner.

[0016] 3. In this invention, the expanded elastic bladder is limited and blocked by the upper baffle and the lower baffle, which allows the internal air pressure of the elastic bladder to be further increased, so that the expanded elastic bladder can transmit the air pressure to the outer wall of the cylinder liner, further improving the pressing and supporting effect on the outer wall of the cylinder liner, and further suppressing the deformation of the cylinder liner during the boring process. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a radial sectional view of the present invention; Figure 4 yes Figure 3 Enlarged view of point B in the middle; Figure 5 This is an axial sectional view of the present invention; Figure 6 This is a cross-sectional view of the clamping cylinder in this invention; Figure 7 This is a perspective view of the clamping cylinder in this invention; Figure 8 This is a perspective view of the clamping strip in this invention; Figure 9 yes Figure 8 A magnified view of point C in the middle.

[0019] In the figure: clamping cylinder 1, mounting ring 11, clamping groove 12, middle ring tube 13, middle air tube 14, upper baffle groove 15, lower baffle groove 16, clamping strip 2, first air hole 21, first spring 22, inclined groove 23, elastic bladder 3, inclined plate 4, second spring 41, protruding strip 42, groove 43, upper baffle 5, upper ring tube 6, upper air tube 61, lower baffle 7, lower ring tube 8, lower air tube 81. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 9 As shown, the present invention includes the following embodiments.

[0022] Example 1: A pneumatic clamping device for boring thin-walled cylinder liners includes a clamping cylinder 1 and a mounting ring 11 at the bottom of the clamping cylinder 1; clamping grooves 12 are uniformly arranged on the inner wall of the clamping cylinder 1; clamping strips 2 are slidably and sealingly connected in the clamping grooves 12; a middle ring pipe 13 is fixedly connected to the outer wall of the clamping cylinder 1; the middle ring pipe 13 is connected to the bottom of the clamping grooves 12 and to a middle air pipe 14; the vertical length of the clamping strips 2 is consistent with the axial direction of the clamping cylinder 1; the radial length of the clamping strips 2 in the clamping cylinder 1 is greater than the depth of the clamping grooves 12; adjacent clamping strips 2 in the circumferential direction are fixedly connected by elastic bladders 3; the elastic bladders 3 are connected to the side of the clamping strips 2 and close to the center of the clamping cylinder 1; a first air hole 21 is provided in the clamping strips 2; one end of the first air hole 21 is connected to the clamping grooves 12, and the other end is connected to the elastic bladder 3; the deflated elastic bladder 3 expands under pressure and fills the gap between adjacent clamping strips 2.

[0023] In this embodiment, the end of the clamping bar 2 near the bottom of the clamping groove 12 is connected to the bottom of the clamping groove 12 by a first spring 22; the elastic bladder 3 expands after the clamping bar 2 extends into the clamping groove 12; the clamping bar 2 retracts into the corresponding clamping groove 12 after the elastic bladder 3 deflates.

[0024] During operation, the operator first moves the clamping device to the worktable, then aligns the central axis of the clamping device with the central axis of the boring bar. Next, the mounting ring 11 is installed on the worktable to fix the position of the clamping device. Then, the central air pipe 14 is connected to the second air pump, and the clamping device is adjusted. After adjustment, it is put into use. The operator inserts the cylinder liner along the upper port of the clamping cylinder 1 into the inner side of the clamping cylinder 1, ensuring that the upper end of the cylinder liner is lower than the upper end of the clamping bar 2, and the lower end of the cylinder liner is higher than the lower end of the clamping bar 2. Then, the second air pump starts working, injecting gas along the central air pipe 14 into the central ring pipe 13. Since the central ring pipe 13 is connected to the inside of the clamping groove 12, the gas in the central ring pipe 13 enters the clamping groove. Inside the clamping groove 12, the first spring 22 inside the clamping groove 12 applies a force to the clamping bar 2 near the central axis of the clamping cylinder 1. Thus, under the combined action of the air pressure inside the clamping groove 12 and the elastic force of the first spring 22, the clamping bar 2 moves closer to the central axis of the clamping cylinder 1. Multiple clamping bars 2 move synchronously closer to the central axis of the clamping cylinder 1. The clamping bar 2 drives the elastic bladders 3 connected on both sides to move closer to the central axis of the clamping cylinder 1 until one end of the clamping bar 2 near the central axis of the clamping cylinder 1 contacts the outer wall of the cylinder liner and can no longer move. Subsequently, the second air pump continuously injects gas into the middle air pipe 14, increasing the air pressure inside the clamping groove 12. Under the action of air pressure, the clamping bar 2 presses against the outer wall of the cylinder liner, clamping the cylinder liner. Additionally, the gas inside the clamping groove 12 also moves along the first spring 22... An air vent 21 enters the elastic bladder 3, causing it to expand. After expansion, the elastic bladder 3 contacts the inner wall of the clamping cylinder 1 and fills the gap between adjacent clamping bars 2. Finally, the expanded elastic bladder 3 contacts the outer wall of the cylinder liner. The air pressure generated inside the expanded elastic bladder 3 is transmitted to the outer wall of the cylinder liner, achieving clamping and support. Then, the air intake of the middle ring pipe 13 is stopped, and the boring bar and the boring tool on it are controlled to move downwards and enter the inner side of the cylinder liner, achieving boring of the inner wall of the cylinder liner. The debris generated during boring falls along the lower end of the clamping cylinder 1. During the boring process, because the outer wall of the cylinder liner is supported by the expanded elastic bladder 3, the outer wall of the cylinder liner not supported by the clamping bars 2 is less prone to deformation, thus achieving the boring of thin... The boring of the wall-type cylinder liner is successfully completed. After the boring of the cylinder liner is completed, the boring bar moves up and drives the boring tool to move out from the inside of the cylinder liner. Then, the operator inserts his hand or a tool into the inside of the cylinder liner and presses it firmly. The second air pump is then controlled to draw away the gas inside the middle ring pipe 13. The gas in the elastic bladder 3 enters the clamping groove 12 along the first air hole 21 and enters the middle ring pipe 13 along the clamping groove 12. Finally, it flows away along the middle air pipe 14. After the elastic bladder 3 deflates, the clamping bar 2 retracts to the corresponding clamping groove 12 under the action of negative pressure, overcoming the elastic force of the first spring 22. The clamping bar 2 will disengage from the contact with the outer wall of the cylinder liner. The clamping bar 2 will drive the deflated elastic bladder 3 away from the cylinder liner. Then the cylinder liner is taken out from the inside of the clamping cylinder 1, completing the boring of a single cylinder liner. The present invention expands the elastic bladder 3 between adjacent clamping bars 2 in the circumferential direction, thereby pressing the outer wall of the cylinder liner that is not supported by the clamping bars 2 against the elastic bladder 3, thereby reducing the deformation of the thin-walled cylinder liner during the boring process and improving the machining accuracy of the thin-walled cylinder liner.

[0025] Example 2: The vertical side of the clamping bar 2 is provided with an inclined groove 23; an inclined plate 4 is slidably connected in the inclined groove 23; the inclined plates 4 on both sides of the clamping bar 2 are symmetrically distributed in a figure-eight shape; the inclined plate 4 is connected to the bottom of the inclined groove 23 by a second spring 41; the end of the inclined plate 4 away from the second spring 41 faces the central axis of the clamping cylinder 1; the inclined plates 4 on the adjacent clamping bars 2 in the circumferential direction extend out of the inclined groove 23 and then contact each other; the distance between the elastic bladder 3 and the central axis of the clamping cylinder 1 is less than the distance between the inclined plate 4 and the central axis of the clamping cylinder 1.

[0026] In this embodiment, one of the inclined plates 4 on the clamping bar 2 is provided with a protrusion 42 at the end away from the corresponding second spring 41; the other inclined plate 4 on the clamping bar 2 is provided with a groove 43 at the end away from the corresponding second spring 41; the groove 43 is adapted to the shape of the protrusion 42; the protrusion 42 and the groove 43 at the end of the inclined plate 4 on the adjacent clamping bars 2 in the circumferential direction are interlocked with each other.

[0027] In this embodiment, the bottom of the inclined groove 23 is connected to the first air hole 21; the gas in the first air hole 21 can enter the inclined groove 23; the inclined plate 4 is slidably sealed to the inclined groove 23.

[0028] During operation, after the operator controls the cylinder liner to enter the inner side of the clamping cylinder 1, the second air pump injects gas into the middle air pipe 14. The gas in the middle air pipe 14 enters the middle ring pipe 13, and the gas in the middle ring pipe 13 enters the clamping groove 12, thereby pushing the clamping bar 2 in the clamping groove 12 to extend. The clamping bar 2 moves away from the bottom of the corresponding clamping groove 12, and the clamping bar 2 drives the inclined groove 23 to protrude from the opening of the clamping groove 12. The inclined plate 4 extends out from the inclined groove 23 under the action of the second spring 41. The end of the inclined plate 4 away from the second spring 41 extends towards the central axis of the clamping cylinder 1. Thus, under the action of the second spring 41, the inclined plate 4 extends towards the elastic bladder 3. The inclined plates 4 on the circumferentially adjacent clamping bars 2 contact after extension, so that the side of the elastic bladder 3 away from the central axis of the clamping cylinder 1 is blocked by the two combined inclined plates 4. In order to further improve the blocking strength of the inclined plate 4 on the elastic bladder 3, a protrusion 42 is provided at the end of one of the two contacting inclined plates 4. At the same time, the two contacting inclined plates 4 are... The other inclined plate 4 of plate 4 is provided with a groove 43 at its end. The convex strip 42 is adapted to the groove 43 and corresponds to it. Therefore, after the ends of the two inclined plates 4 come into contact, the convex strip 42 can be inserted into the corresponding groove 43 to complete the contact and connection of the ends of the two inclined plates 4. This further improves the compressive strength of the two inclined plates 4 from the elastic bladder 3. In addition, since the end of the inclined plate 4 away from the bottom of the inclined groove 23 extends towards the central axis of the clamping cylinder 1, the inclined plates 4 on the two clamping bars 2 can be combined into an angle plate after they come into contact with each other. The inner angle of the angle plate is away from the corresponding elastic bladder 3, which further improves the compressive strength of the inclined plate 4 on the elastic bladder 3. More importantly, after the inclined groove 23 is exposed to the corresponding clamping groove 12 along the clamping bar 2, the gas will enter the inclined groove 23 along the first air hole 21 and be squeezed out by the downward inclined plate 4 with the cooperation of the second spring 41. If the inclined plate 4 is compressed back to the corresponding inclined groove 23, it needs to overcome the air pressure in the inclined groove 23, which further improves the limiting strength of the inclined plate 4 on the elastic bladder 3. After the clamping bar 2 and the inclined plate 4 extend one after another, as the air pressure in the clamping groove 12 increases, the gas in the clamping groove 12 will enter the elastic bladder 3 along the first air hole 21. The gas will overcome the elastic force of the elastic bladder 3 itself, causing the elastic bladder 3 to expand. Due to the restriction of the elastic bladder 3 by the inclined plate 4, after the expanded elastic bladder 3 is pressed against the side of the inclined plate 4 near the central axis of the clamping cylinder 1, the elastic bladder 3 will expand towards the outer wall of the cylinder liner. In this way, the outer wall of the cylinder liner is quickly pressed, which greatly improves the clamping efficiency of the cylinder liner. After the boring process is completed, the second air pump will remove the gas from the clamping groove 12. Without the restriction of the first spring 22 and the second spring 41, the elastic bladder 3 will deflate first. Under its own elastic force, the elastic bladder 3 will deflate. Then, under the negative pressure, the inclined plate 4 will retract into the corresponding inclined groove 23 against the second spring 41. The clamping bar 2 will move towards the bottom of the clamping groove 12 against the first spring 22. The inclined plate 4 exposed outside the inclined groove 23 will be squeezed by the opening of the clamping groove 12 during the process of the clamping bar 2 retracting into the clamping groove 12, so that the inclined plate 4 is tilted and squeezed into the corresponding inclined groove 23, and the clamping bar 2 will not cause interference when it retracts into the clamping groove 12.

[0029] Example 3: The inner wall of the clamping cylinder 1 is provided with an upper baffle groove 15; the upper baffle groove 15 is located directly above and close to the clamping groove 12; an upper baffle 5 is slidably and sealingly connected inside the upper baffle groove 15; an upper ring tube 6 is fixedly connected to the outer wall of the clamping cylinder 1; the upper ring tube 6 connects the upper air pipe 61 and the upper baffle groove 15; the upper baffle 5 is located directly above the corresponding elastic bladder 3 after extending out of the upper baffle groove 15; The inner wall of the clamping cylinder 1 is provided with a lower baffle groove 16; the lower baffle groove 16 is located directly below the clamping groove 12 and is arranged close to each other; the lower baffle 7 is slidably and sealingly connected to the lower baffle groove 16; the outer wall of the clamping cylinder 1 is fixedly connected to the lower ring pipe 8; the lower ring pipe 8 connects the lower air pipe 81 and the lower baffle groove 16; the lower air pipe 81 and the upper air pipe 61 are connected to the second air pump.

[0030] During operation, the middle air pipe 14 is controlled by the first air pump, while the upper air pipe 61 and lower air pipe 81 are controlled by the second air pump. Before the operator inserts the cylinder liner into the clamping cylinder 1, the first air pump is controlled to remove the gas from the clamping groove 12, and the second air pump is controlled to remove the gas from the upper air pipe 61 and lower air pipe 81. This causes the clamping bar 2 to retract into the clamping groove 12, the upper baffle 5 to retract into the upper baffle groove 15, and the lower baffle 7 to retract into the lower baffle groove 16. The operator will then place the cylinder liner inside the clamping cylinder 1 and start the second air pump. The second air pump will pump gas along the upper air pipe 61 into the upper ring pipe 6. The gas in the upper ring pipe 6 will enter the upper baffle groove 15, causing the upper baffle 5 to extend under air pressure. The upper baffle 5 extends to the inside of the clamping cylinder 1, but will not extend to the inside of the cylinder liner, thus avoiding interference during boring. After extending, the upper baffle 5 will block the area directly above the corresponding elastic bladder 3. The number of upper baffles 5 and lower baffles 7 is the same as that of the elastic bladder 3. After a portion of the gas enters the upper air pipe 61, another portion of the gas simultaneously enters the lower air pipe 81. The gas in the lower air pipe 81 enters the lower ring pipe 8, and the gas in the lower ring pipe 8 enters the lower baffle groove 16. The gas in the lower baffle groove 16 pushes the lower baffle 7 to extend out of the lower baffle groove 16. After the lower baffle 7 extends, it will be located directly below the corresponding elastic bladder 3, thereby limiting and blocking the lower part of the elastic bladder 3. Then the first air pump works, causing the clamping bar 2 to clamp the cylinder liner. The elastic bladder 3 expands accordingly. The expanded elastic bladder 3 is limited and blocked by the upper baffles 5 and the lower baffles 7. This allows the internal air pressure of the elastic bladder 3 to be further increased, so that the expanded elastic bladder 3 can transmit the air pressure to the outer wall of the cylinder liner, further improving the pressing and supporting effect on the outer wall of the cylinder liner, and further suppressing the deformation of the cylinder liner during the boring process.

[0031] Example 4: The natural length of the elastic bladder 3 in the circumferential direction of the clamping cylinder 1 is less than the distance between the adjacent clamping strips 2 in the circumferential direction of the clamping cylinder 1; after the clamping strips 2 extend out of the corresponding clamping grooves 12, the elastic bladder 3 is in a stretched state in the circumferential direction of the clamping cylinder 1.

[0032] During operation, as the elastic bladder 3 expands and deflates, impurities adhering to its surface fall off, preventing them from remaining and thus avoiding them from getting stuck between the elastic bladder 3 and the outer wall of the cylinder liner. This ensures the elastic bladder 3 effectively holds the cylinder liner in place. Furthermore, whether the clamping strip 2 extends or retracts into the clamping groove 12, the elastic bladder 3 is in a state of tension in the horizontal direction, causing it to be tightened. This horizontal tension can be understood as the elastic bladder 3 being pulled upwards around the clamping cylinder 1, or as the elastic bladder 3 being pulled by the two clamping strips 2 at its ends. After the inclined plate 4 extends out of the corresponding inclined groove 23, as the inclined plates 4 on adjacent clamping strips 2 approach and contact each other, the taut elastic bladder 3 is less likely to be clamped by the two inclined plates 4, allowing the two inclined plates 4 to make better and more stable contact.

[0033] Example 5: The thickness of the elastic bladder 3 varies in the vertical direction; the thickness of the elastic bladder 3 in the vertical direction increases as it moves away from the center position.

[0034] During operation, the elastic bladder 3 is positioned centrally in the vertical direction of the clamping bar 2. Normally, the axial length of the cylinder liner is consistent with the vertical length of the elastic bladder 3. However, to accommodate boring operations on more cylinder liners, the thickness of the elastic bladder 3 is limited. The elastic bladder 3 is divided into upper, middle, and lower positions in the vertical direction. The middle position of the elastic bladder 3 is the thinnest, and its thickness increases with distance from the middle position. Therefore, the upper and lower positions of the elastic bladder 3 are the thickest. Thus, during the placement of the cylinder liner inside the clamping cylinder 1, the middle position of the cylinder liner must correspond to the middle position of the elastic bladder 3. When gas enters the elastic bladder 3, the middle position of the elastic bladder 3 expands first. After expansion, it will press tightly against the outer wall of the middle section of the cylinder liner. As the internal air pressure of the elastic bladder 3 increases, the part of the elastic bladder 3 away from the middle section begins to expand. After the elastic bladder 3 expands slightly above the cylinder liner, the first air pump stops supplying air to the inside of the elastic bladder 3. In this way, the cylinder liner with a vertical length less than the elastic bladder 3 is clamped. The position of the elastic bladder 3 above the cylinder liner after slight expansion can limit the upper position of the cylinder liner, and the position of the elastic bladder 3 below the cylinder liner after slight expansion can limit the lower position of the cylinder liner. In this way, the vertical limit of the cylinder liner is achieved, which further improves the clamping effect of the cylinder liner and makes the boring of the cylinder liner more stable. In this embodiment, the slight expansion of the position of the elastic bladder 3 above the cylinder liner will not exceed the inner edge of the cylinder liner and will not interfere with the boring process.

[0035] In this application, the circumferential direction claimed by each component refers to the circumferential direction of the clamping cylinder 1.

[0036] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic clamping device for boring thin-walled cylinder liners, comprising a clamping cylinder (1) and a mounting ring (11) at the bottom of the clamping cylinder (1); clamping grooves (12) are uniformly arranged on the inner wall of the clamping cylinder (1); a clamping strip (2) is slidably and sealingly connected in the clamping grooves (12); a middle ring pipe (13) is fixedly connected to the outer wall of the clamping cylinder (1); the middle ring pipe (13) communicates with the bottom of the clamping grooves (12) and is also connected to a middle air pipe (14); characterized in that: The vertical length of the clamping bar (2) is aligned with the axial direction of the clamping cylinder (1); the radial length of the clamping bar (2) in the clamping cylinder (1) is greater than the depth of the clamping groove (12); adjacent clamping bars (2) in the circumferential direction are fixedly connected by an elastic bladder (3); the elastic bladder (3) is connected to the side of the clamping bar (2) and close to the center of the clamping cylinder (1); a first air hole (21) is provided inside the clamping bar (2); one end of the first air hole (21) is connected to the clamping groove (12), and the other end is connected to the elastic bladder (3); the deflated elastic bladder (3) expands under air pressure and fills the gap between adjacent clamping bars (2); The clamping strip (2) is connected to the bottom of the clamping groove (12) by a first spring (22); the elastic bladder (3) expands after the clamping strip (2) extends into the clamping groove (12); the clamping strip (2) retracts into the corresponding clamping groove (12) after the elastic bladder (3) deflates. The vertical side of the clamping bar (2) is provided with a groove (23); a sloping plate (4) is slidably connected in the groove (23); the sloping plates (4) on both sides of the clamping bar (2) are symmetrically distributed in a figure-eight shape; the sloping plate (4) is connected to the bottom of the groove (23) by a second spring (41); the end of the sloping plate (4) away from the second spring (41) faces the central axis of the clamping cylinder (1); the sloping plates (4) on the adjacent clamping bars (2) extend out of the groove (23) and then contact each other; the distance between the elastic bladder (3) and the central axis of the clamping cylinder (1) is less than the distance between the sloping plate (4) and the central axis of the clamping cylinder (1); One of the inclined plates (4) on the clamping bar (2) has a protrusion (42) at the end away from the corresponding second spring (41); the other inclined plate (4) on the clamping bar (2) has a groove (43) at the end away from the corresponding second spring (41); the groove (43) is adapted to the shape of the protrusion (42); the protrusion (42) at the end of the inclined plate (4) on the circumferentially adjacent clamping bars (2) and the groove (43) are interlocked with each other; The bottom of the inclined groove (23) is connected to the first air hole (21); the gas in the first air hole (21) can enter the inclined groove (23); the inclined plate (4) is slidably sealed to the inclined groove (23).

2. The pneumatic clamping device for boring thin-walled cylinder liners according to claim 1, characterized in that: The inner wall of the clamping cylinder (1) is provided with an upper baffle groove (15); the upper baffle groove (15) is located directly above and close to the clamping groove (12); the upper baffle (5) is slidably and sealingly connected inside the upper baffle groove (15); the outer wall of the clamping cylinder (1) is fixedly connected to an upper ring pipe (6); the upper ring pipe (6) is connected to the upper air pipe (61) and the upper baffle groove (15); the upper baffle (5) is located directly above the corresponding elastic bladder (3) after extending out of the upper baffle groove (15); The inner wall of the clamping cylinder (1) is provided with a lower baffle groove (16); the lower baffle groove (16) is located directly below the clamping groove (12) and is close to each other; the lower baffle plate (7) is slidably sealed inside the lower baffle groove (16); the outer wall of the clamping cylinder (1) is fixedly connected to the lower ring pipe (8); the lower ring pipe (8) is connected to the lower air pipe (81) and the lower baffle groove (16).

3. The pneumatic clamping device for boring thin-walled cylinder liners according to claim 1, characterized in that: The natural length of the elastic bladder (3) in the circumferential direction of the clamping cylinder (1) is less than the distance between the adjacent clamping strips (2) in the circumferential direction of the clamping cylinder (1); after the clamping strips (2) extend out of the corresponding clamping grooves (12), the elastic bladder (3) is in a pulling state in the circumferential direction of the clamping cylinder (1).

4. The pneumatic clamping device for boring thin-walled cylinder liners according to claim 1, characterized in that: The thickness of the elastic bladder (3) is varied in the vertical direction; the thickness of the elastic bladder (3) in the vertical direction increases as it moves away from the center position.

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