Pneumatic clamping device for boring thin-wall cylinder sleeve

Abstract

The invention relates to the technical field of workpiece clamping, in particular to a thin-wall air cylinder sleeve boring pneumatic clamping device. Comprising a clamping cylinder and a mounting ring at the bottom of the clamping cylinder; clamping grooves are uniformly formed in the inner wall of the clamping cylinder; a clamping strip is connected into the clamping groove in a sliding and sealing mode. The outer wall of the clamping cylinder is fixedly connected with a middle ring pipe; the middle ring pipe is communicated with the bottom of the clamping groove and is communicated with a middle gas pipe; the vertical length direction of the clamping strips is consistent with the axial direction of the clamping cylinder; the length of the clamping strips in the radial direction of the clamping cylinder is larger than the depth of the clamping grooves. The adjacent clamping strips in the circumferential direction are fixedly connected through an elastic bag; the elastic bag is connected with the side face of the clamping strip and close to the center of the clamping cylinder. The elastic bags between the adjacent clamping strips in the circumferential direction expand, so that the outer wall, not supported by the clamping strips, of the outer wall of the air cylinder sleeve is tightly abutted by the elastic bags, deformation of the thin-wall air cylinder sleeve in the boring process is reduced, and the machining precision of the thin-wall air cylinder sleeve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece clamping, in particular to a pneumatic clamping device for boring a thin-wall cylinder sleeve. Background Art

[0002] Cylinder liner machining is a precision process designed to ensure that the cylinder liner has the correct dimensions and a high-quality surface. First, the raw material needs to be pre-treated before machining, including removing surface dirt and defects. Then, the cylinder liner is fixed on the processing equipment, usually operated by a CNC machine tool. In the preliminary machining stage, excess material is removed through rough machining to prepare for subsequent fine machining. Next, in the fine machining stage, high-precision tools are used to finely cut the cylinder liner to ensure that the hole diameter, roundness and surface finish meet the design requirements. In order to improve the machining accuracy, a boring process is usually used so that the inner wall of the cylinder liner reaches the required size after boring.

[0003] During the boring process of the cylinder liner, a clamping device is needed to clamp the cylinder liner. In order to be suitable for cylinder liners of different diameters, the existing clamping device has clamping blocks that can be extended and retracted in the radial direction of the cylinder liner. The outer wall of the cylinder liner is contacted and clamped by the clamping blocks approaching the center of the cylinder liner. The number of clamping blocks is limited, and there is a gap between adjacent clamping blocks in the circumferential direction. In this way, the outer wall of the cylinder liner to be processed is not completely clamped, and the outer wall of the cylinder liner that is not clamped will produce slight deformation during the boring process, especially for the boring process of thin-walled cylinder liners, the deformation is more obvious, which affects the processing accuracy of the cylinder liner.

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

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a pneumatic clamping device for boring thin-walled cylinder liner. The present invention expands the elastic bags between adjacent clamping strips in the circumferential direction, so that the outer wall of the cylinder liner not supported by the clamping strips is pressed by the elastic bags, thereby reducing the deformation of the thin-walled cylinder liner during the boring process, thereby improving the processing accuracy of the thin-walled cylinder liner.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a pneumatic clamping device for boring thin-walled cylinder sleeves described in the present invention comprises a clamping tube and a mounting ring at the bottom of the clamping tube; the inner wall of the clamping tube is evenly provided with clamping grooves; the clamping groove is connected to a clamping strip with a sliding seal; the outer wall of the clamping tube is fixedly connected to a middle ring tube; 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 tube; the radial length of the clamping strip in the clamping tube is greater than the depth of the clamping groove; adjacent clamping strips in the circumferential direction are fixedly connected by an elastic bag; the elastic bag is connected to the side of the clamping strip and close to the center of the clamping tube; 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 bag; the deflated elastic bag is compressed and expanded to fill the gap between adjacent clamping strips.

[0007] Preferably, one end of the clamping strip close to the bottom of the clamping groove is connected to the bottom of the clamping groove through a first spring; the elastic bag expands after the clamping strip extends to the clamping groove; and the clamping strip retracts to the corresponding clamping groove after the elastic bag shrinks.

[0008] Preferably, the vertical side surface of the clamping strip 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 strip are symmetrically distributed in an eight-shaped 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 tube; the inclined plates on the circumferentially adjacent clamping strips contact after extending out of the inclined groove; the distance between the elastic bag and the central axis of the clamping tube is smaller than the distance between the inclined plate and the central axis of the clamping tube.

[0009] Preferably, one of the inclined plates on the clamping strip is provided with a convex strip at one end away from the corresponding second spring; the other inclined plate on the clamping strip is provided with a groove at one end away from the corresponding second spring; the groove is adapted to the shape of the convex strip; the convex strips and grooves at the ends of the inclined plates on the circumferentially adjacent clamping strips are plugged into each other.

[0010] Preferably, the bottom of the inclined groove is communicated with the first air hole; the gas in the first air hole can enter the inclined groove; and the inclined plate is connected to the inclined groove in a sliding and sealing manner.

[0011] Preferably, the inner wall of the clamping tube is provided with an upper retaining groove; the upper retaining groove is located directly above the clamping groove and is arranged close to it; the upper retaining plate is connected to the upper retaining plate in a sliding seal in the upper retaining groove; the outer wall of the clamping tube is fixedly connected to the upper ring tube; the upper ring tube is connected to the upper air pipe and the upper retaining groove; the upper retaining plate is located directly above the corresponding elastic bag after extending out of the upper retaining groove; The inner wall of the clamping tube is provided with a lower retaining groove; the lower retaining groove is located directly below the clamping groove and is arranged close to each other; the sliding seal in the lower retaining groove is connected to the lower retaining plate; the outer wall of the clamping tube is fixedly connected to the lower ring tube; the lower ring tube is connected to the lower air pipe and the lower retaining 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 bag in the circumferential direction of the clamping tube is smaller than the distance between adjacent clamping strips in the circumferential direction of the clamping tube; after the clamping strip extends out of the corresponding clamping groove, the elastic bag is in a pulling state in the circumferential direction of the clamping tube.

[0013] Preferably, the thickness of the elastic bag is varied in the vertical direction; the thickness of the elastic bag in the vertical direction increases as it moves away from the middle position.

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

[0015] 2. Due to the restriction of the inclined plate on the elastic bag, the expanded elastic bag will expand toward the outer wall of the cylinder liner after it abuts against the side of the inclined plate close to the central axis of the clamping tube, so that the outer wall of the cylinder liner is quickly pressed tightly, greatly improving the clamping efficiency of the cylinder liner.

[0016] 3. The inflated elastic bag in the present invention will be limited and blocked by the upper baffle and the lower baffle, so that the internal air pressure of the elastic bag can be further expanded, so that the inflated elastic bag can transfer the air pressure to the outer wall of the cylinder liner, further improving the supporting effect on the outer wall of the cylinder liner, so that the cylinder liner can be further suppressed from deformation during the boring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0018] Figure 1 is a stereogram of the present invention; Figure 2 yes Figure 1 The enlarged view of point A in the middle; Figure 3 is a radial cross-sectional view of the present invention; Figure 4 yes Figure 3 The enlarged view of point B in the middle; Figure 5 is an axial cross-sectional view of the present invention; Figure 6 is a cross-sectional view of the clamping tube in the present invention; Figure 7 is a three-dimensional diagram of the clamping tube in the present invention; Figure 8 is a three-dimensional diagram of the clamping strip of the present invention; Fig. 9 yes Figure 8 Enlarged 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 pipe 14, upper retaining groove 15, lower retaining groove 16, clamping strip 2, first air hole 21, first spring 22, inclined groove 23, elastic bag 3, inclined plate 4, second spring 41, convex strip 42, groove 43, upper baffle plate 5, upper ring tube 6, upper air pipe 61, lower baffle plate 7, lower ring tube 8, lower air pipe 81. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

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

[0022] Embodiment 1: A pneumatic clamping device for boring a thin-walled cylinder sleeve comprises a clamping tube 1 and a mounting ring 11 at the bottom of the clamping tube 1; the inner wall of the clamping tube 1 is evenly provided with clamping grooves 12; the clamping groove 12 is slidingly and sealably connected to a clamping strip 2; the outer wall of the clamping tube 1 is fixedly connected to a middle ring tube 13; the middle ring tube 13 is connected to the bottom of the clamping groove 12 and to a middle air pipe 14; the vertical length direction of the clamping strip 2 is consistent with the axial direction of the clamping tube 1; the radial length of the clamping strip 2 in the clamping tube 1 is greater than the depth of the clamping groove 12; adjacent clamping strips 2 in the circumferential direction are fixedly connected by elastic bags 3; the elastic bags 3 are connected to the side of the clamping strip 2 and close to the center of the clamping tube 1; a first air hole 21 is provided in the clamping strip 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 bag 3; the deflated elastic bag 3 is compressed and expands to fill the gap between adjacent clamping strips 2.

[0023] In this embodiment, the end of the clamping strip 2 close to the bottom of the clamping groove 12 is connected to the bottom of the clamping groove 12 through a first spring 22; the elastic bag 3 expands after the clamping strip 2 extends to the clamping groove 12; the clamping strip 2 retracts to the corresponding clamping groove 12 after the elastic bag 3 deflates.

[0024] During work, the staff first moves the clamping device to the workbench, then aligns the center axis of the clamping device with the center axis of the boring bar, and then installs the mounting ring 11 on the workbench to fix the position of the clamping device, and then connects the middle gas pipe 14 to the second air pump to debug the clamping device. After debugging, it is put into use. The staff will put the cylinder sleeve along the upper port of the clamping tube 1 into the inner side of the clamping tube 1, and ensure that the upper end of the cylinder sleeve is lower than the upper end of the clamping strip 2, and the lower end of the cylinder sleeve is higher than the lower end of the clamping strip 2. Then the second air pump starts working, and the second air pump will inject gas into the middle ring pipe 13 along the middle gas pipe 14. Since the middle ring pipe 13 is connected to the inside of the clamping groove 12, the gas in the middle ring pipe 13 will enter the clamping groove 12. Inside the holding groove 12, the first spring 22 in the clamping groove 12 will give the clamping strip 2 a force close to the central axis of the clamping tube 1, so that under the dual action of the air pressure in the clamping groove 12 and the elastic force of the first spring 22, the clamping strip 2 moves close to the central axis of the clamping tube 1, and multiple clamping strips 2 will synchronously approach the central axis of the clamping tube 1, and the clamping strip 2 will drive the elastic bags 3 connected on both sides to approach the central axis of the clamping tube 1, until the end of the clamping strip 2 close to the central axis of the clamping tube 1 contacts the outer wall of the cylinder sleeve and cannot move further, and then the second air pump continues to inject gas into the middle air pipe 14, so that the air pressure in the clamping groove 12 increases accordingly, and the clamping strip 2 is pressed against the outer wall of the cylinder sleeve under the action of the air pressure, so that the cylinder sleeve is clamped by the clamping strip 2, and in addition, the gas in the clamping groove 12 will also move along the first spring 22. After the air hole 21 enters the elastic bag 3, the elastic bag 3 begins to expand. After the elastic bag 3 expands, it will contact the inner wall of the clamping tube 1. After the elastic bag 3 expands, it will fill the gap between the adjacent clamping strips 2. The expanded elastic bag 3 will eventually contact the outer wall of the cylinder liner. The air pressure generated inside the expanded elastic bag 3 will be transmitted to the outer wall of the cylinder liner, thereby achieving the tightness and support of the outer wall of the cylinder liner. Subsequently, the air intake of the middle ring pipe 13 is stopped, and the boring bar and the boring tool on the boring bar are controlled to move downward and enter the inner side of the cylinder liner to achieve the boring of the inner wall of the cylinder liner. The debris generated by the boring can fall along the lower port of the clamping tube 1. During the boring process, since the outer wall of the cylinder liner is supported by the expanded elastic bag 3, the outer wall of the cylinder liner that is not supported by the clamping strip 2 is not easy to deform, thereby achieving the thin The boring of the wall-type cylinder liner is processed smoothly; after the boring of the cylinder liner is completed, the boring bar will move up, and the boring bar will drive the boring tool to move out from the inner side of the cylinder liner, and then the staff will use their hands or tools to reach into the inner side of the cylinder liner and press it tightly, and then control the second air pump to extract the gas inside the middle ring tube 13, and the gas in the elastic bag 3 will enter the clamping groove 12 along the first air hole 21, and enter the middle ring tube 13 along the clamping groove 12, and finally flow away along the middle air pipe 14. After the elastic bag 3 is deflated, the clamping strip 2 overcomes the elastic force of the first spring 22 under the action of negative pressure and retracts to the corresponding clamping groove 12, and the clamping strip 2 will break away from the contact with the outer wall of the cylinder liner, and the clamping strip 2 will drive the deflated elastic bag 3 away from the cylinder liner, and then the cylinder liner is taken out from the inner side of the clamping tube 1, and the boring of a single cylinder liner is completed; The present invention expands the elastic bag 3 between the adjacent clamping strips 2 in the circumferential direction, so that the outer wall of the cylinder liner not supported by the clamping strip 2 is pressed against the elastic bag 3, thereby reducing the deformation of the thin-walled cylinder liner during the boring process, so that the processing accuracy of the thin-walled cylinder liner is improved.

[0025] Embodiment 2: The vertical side surface of the clamping strip 2 is provided with an inclined groove 23; the inclined plate 4 is slidably connected in the inclined groove 23; the inclined plates 4 on both sides of the clamping strip 2 are symmetrically distributed in an eight-shaped shape; the inclined plate 4 is connected to the bottom of the inclined groove 23 through a second spring 41; the end of the inclined plate 4 away from the second spring 41 is toward the central axis of the clamping tube 1; the inclined plates 4 on the circumferentially adjacent clamping strips 2 extend out of the inclined groove 23 and then contact each other; the distance between the elastic bag 3 and the central axis of the clamping tube 1 is smaller than the distance between the inclined plate 4 and the central axis of the clamping tube 1.

[0026] In this embodiment, one of the inclined plates 4 on the clamping strip 2 is provided with a convex strip 42 at one end away from the corresponding second spring 41; the other inclined plate 4 on the clamping strip 2 is provided with a groove 43 at one end away from the corresponding second spring 41; the groove 43 is adapted to the shape of the convex strip 42; the convex strips 42 and the grooves 43 at the ends of the inclined plates 4 on the circumferentially adjacent clamping strips 2 are plugged into 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 connected to the inclined groove 23 in a sliding and sealing manner.

[0028] When working, after the staff controls the cylinder sleeve to enter the inner side of the clamping tube 1, the second air pump injects gas into the middle air pipe 14, and the gas in the middle air pipe 14 will enter the middle ring tube 13, and the gas in the middle ring tube 13 will enter the clamping groove 12, thereby pushing the clamping strip 2 in the clamping groove 12 to extend, and the clamping strip 2 moves away from the corresponding clamping groove 12 bottom. The clamping strip 2 will drive the inclined groove 23 to be exposed from the notch of the clamping groove 12, and the inclined plate 4 will extend out of the inclined groove 23 under the action of the second spring 41, and the end of the inclined plate 4 away from the second spring 41 will extend toward the central axis direction of the clamping tube 1. In this way, under the action of the second spring 41, the inclined plate 4 will extend toward the elastic bag 3, and the inclined plates 4 on the circumferentially adjacent clamping strips 2 will contact each other after extending, so that the elastic bag 3 is blocked by the two combined inclined plates 4 on the side away from the central axis of the clamping tube 1. In order to further enhance the blocking strength of the inclined plate 4 to the elastic bag 3, a convex strip 42 is provided at the end of one of the two contacting inclined plates 4, and the two contacting inclined plates The other inclined plate 4 end of the plate 4 is provided with a groove 43, and the convex strip 42 is adapted to the specifications of the groove 43 and corresponds to each other. Therefore, after the two inclined plates 4 end portions contact, the convex strip 42 can be inserted into the corresponding groove 43, completing the contact and connection of the two inclined plates 4 end portions, thereby further improving the compressive strength of the two inclined plates 4 from the elastic bag 3. In addition, since the end of the inclined plate 4 away from the bottom of the inclined groove 23 extends toward the central axis of the clamping tube 1, the inclined plates 4 on the two clamping strips 2 can be combined into an angle plate after contacting each other, and the inner angle of the angle plate deviates from the corresponding elastic bag 3, thereby further improving the compressive strength of the inclined plate 4 to the elastic bag 3; more importantly, after the inclined groove 23 is exposed to the corresponding clamping groove 12 along the clamping strip 2, the gas will enter the inclined groove 23 along the first air hole 21, and be squeezed out of the 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 is necessary to overcome the air pressure in the inclined groove 23, thereby further improving the limiting strength of the inclined plate 4 to the elastic bag 3; After the clamping strip 2 and the inclined plate 4 are extended successively, as the air pressure in the clamping groove 12 increases, the gas in the clamping groove 12 will enter the elastic bag 3 along the first air hole 21, and the gas will overcome the elastic force of the elastic bag 3 itself, so that the elastic bag 3 will expand. Due to the restriction of the inclined plate 4 on the elastic bag 3, the expanded elastic bag 3 will expand toward the outer wall of the cylinder sleeve after it abuts against the side of the inclined plate 4 close to the central axis of the clamping tube 1, so that the outer wall of the cylinder sleeve is quickly pressed, which greatly improves the clamping efficiency of the cylinder sleeve. After completing the boring process, the second air pump will extract the gas in the clamping groove 12. The elastic bag 3 will shrink first without the restriction of the first spring 22 and the second spring 41. The elastic bag 3 will shrink under the action of its own elastic force, and then the inclined plate 4 will retract into the corresponding inclined groove 23 under the action of negative pressure, overcoming the second spring 41. The clamping bar 2 will overcome the first spring 22 and move toward the bottom of the clamping groove 12. The inclined plate 4 exposed on the outside of the inclined groove 23 will be squeezed by the notch 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 retraction of the clamping bar 2 will not interfere with the clamping groove 12.

[0029] Embodiment 3: The inner wall of the clamping tube 1 is provided with an upper retaining groove 15; the upper retaining groove 15 is located directly above the clamping groove 12 and is arranged close thereto; the upper retaining plate 5 is connected to the sliding seal in the upper retaining groove 15; the outer wall of the clamping tube 1 is fixedly connected to the upper ring tube 6; the upper ring tube 6 is connected to the upper air pipe 61 and the upper retaining groove 15; the upper retaining plate 5 is located directly above the corresponding elastic bag 3 after extending out of the upper retaining groove 15; The inner wall of the clamping tube 1 is provided with a lower retaining groove 16; the lower retaining groove 16 is located directly below the clamping groove 12 and is arranged close to each other; the lower retaining groove 16 is slidingly sealed and connected to the lower baffle 7; the outer wall of the clamping tube 1 is fixedly connected to the lower ring tube 8; the lower ring tube 8 is connected to the lower air pipe 81 and the lower retaining 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, and the upper air pipe 61 and the lower air pipe 81 are controlled by the second air pump. Before the staff extends the cylinder sleeve into the inner side of the clamping tube 1, the first air pump is controlled to pump out the gas in the clamping groove 12, and the second air pump is controlled to pump out the gas in the upper air pipe 61 and the lower air pipe 81 at the same time, so that the clamping bar 2 is retracted to the clamping groove 12, the upper baffle 5 is retracted to the upper baffle groove 15, and the lower baffle 7 is retracted to the lower baffle groove 16. Then the staff will place the cylinder sleeve inside the clamping tube 1 and start the second air pump. The second air pump will fill the gas into the upper ring tube 6 along the upper air pipe 61. The gas in the upper ring tube 6 will enter the upper baffle groove 15, so that the upper baffle plate 5 will extend under the action of air pressure. The upper baffle plate 5 extends to the inside of the clamping tube 1, but will not extend to the inside of the cylinder sleeve, so as to avoid interference in boring processing. After extending, the upper baffle plate 5 will cover the corresponding elastic bag 3 directly above. The number of upper baffles 5 and the number of lower baffles 7 are the same as those of the elastic bag 3; after a part of the gas enters the upper air pipe 61, the other part of the gas enters the lower air pipe 81 at the same time, the gas in the lower air pipe 81 will enter the lower annular tube 8, and the gas in the lower annular tube 8 will enter the lower baffle groove 16, and the gas in the lower baffle groove 16 will push the lower baffle plate 7 to extend from the lower baffle groove 16. After the lower baffle plate 7 is extended, it will be located directly below the corresponding elastic bag 3, thereby achieving a limited shielding of the lower part of the elastic bag 3, and then the first air pump works to clamp the clamping strip 2 to the cylinder sleeve, and the elastic bag 3 expands accordingly, and the expanded elastic bag 3 will be limited and blocked by the upper baffle plate 5 and the lower baffle plate 7, so that the internal air pressure of the elastic bag 3 can be further expanded, so that the expanded elastic bag 3 can transmit the air pressure to the outer wall of the cylinder sleeve, further improving the tight support effect on the outer wall of the cylinder sleeve, so that the cylinder sleeve can further suppress deformation during the boring process.

[0031] Embodiment 4: The natural length of the elastic bag 3 in the circumferential direction of the clamping tube 1 is smaller than the distance between adjacent clamping strips 2 in the circumferential direction of the clamping tube 1 ; after the clamping strip 2 extends out of the corresponding clamping groove 12 , the elastic bag 3 is in a pulling state in the circumferential direction of the clamping tube 1 .

[0032] During operation, during the expansion and deflation of the elastic bag 3, impurities attached to the surface of the elastic bag 3 fall off and are not easy to remain, thereby avoiding impurities from being stuck between the elastic bag 3 and the outer wall of the cylinder liner, thereby ensuring the tightening effect of the elastic bag 3 on the cylinder liner. In addition, whether the clamping strip 2 is extended or retracted to the clamping groove 12, the elastic bag 3 is in a pulling state in the horizontal direction, so that the elastic bag 3 is tightened. The pulling of the elastic bag 3 in the horizontal direction can be understood as the elastic bag 3 being pulled in the circumferential direction of the clamping tube 1, and can also be understood as the elastic bag 3 being pulled by the two clamping strips 2 at the end. After the inclined plate 4 extends out of the corresponding inclined groove 23, the inclined plates 4 on adjacent clamping strips 2 are close to each other. The tightened elastic bag 3 is not easily clamped by the two inclined plates 4, so that the two inclined plates 4 can be in better and more stable contact.

[0033] Embodiment 5: The thickness of the elastic bag 3 is varied in the vertical direction; the thickness of the elastic bag 3 in the vertical direction increases as it moves away from the middle position.

[0034] During operation, the elastic bag 3 is located in the center of the clamping strip 2 in the vertical direction. Normally, the axial length of the cylinder sleeve is consistent with the length of the elastic bag 3 in the vertical direction. However, in order to be applicable to more boring processes of the cylinder sleeves, the thickness of the elastic bag 3 is limited. The elastic bag 3 is divided into an upper end position, a middle position and a lower end position in the vertical direction. The thickness of the elastic bag 3 in the middle position is the thinnest, and the thickness of the elastic bag 3 increases as it moves away from the middle position. It can be seen that the thickness of the upper end position and the lower end position of the elastic bag 3 is the thickest. In this way, when the cylinder sleeve is placed inside the clamping tube 1, the middle position of the cylinder sleeve needs to correspond to the middle position of the elastic bag 3. In this way, when gas enters the elastic bag 3, the middle position of the elastic bag 3 expands first, and the middle position of the elastic bag 3 expands. After expansion, it will press against the middle outer wall of the cylinder liner. As the air pressure inside the elastic bag 3 increases, the part of the elastic bag 3 away from the middle position begins to expand. After the elastic bag 3 expands slightly above the cylinder liner, the first air pump stops supplying air to the elastic bag 3, thereby completing the clamping of the cylinder liner whose vertical length is smaller than the elastic bag 3; the position of the elastic bag 3 above the cylinder liner can be limited to the upper position of the cylinder liner after slightly expanding, and the position of the elastic bag 3 below the cylinder liner can be limited to the lower position of the cylinder liner after slightly expanding, thereby achieving the vertical limitation of the cylinder liner, further improving the clamping effect of the cylinder liner, and making the boring of the cylinder liner more stable; the elastic bag 3 in this embodiment expands slightly above the cylinder liner and will not exceed the inner edge of the cylinder liner, and will not interfere with the boring process.

[0035] The circumferential direction of each component in the present application refers to the circumferential direction of the clamping cylinder 1 .

[0036] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood 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 cannot be understood as indicating or implying relative importance.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pneumatic clamping device for boring a thin-walled cylinder sleeve, comprising a clamping tube (1) and a mounting ring (11) at the bottom of the clamping tube (1); the inner wall of the clamping tube (1) is evenly provided with clamping grooves (12); the inner wall of the clamping groove (12) is connected to a clamping strip (2) in a sliding seal; the outer wall of the clamping tube (1) is fixedly connected to a middle ring tube (13); the middle ring tube (13) is connected to the bottom of the clamping groove (12) and is connected to a middle air pipe (14); the characteristics are: The vertical length direction of the clamping strip (2) is consistent with the axial direction of the clamping tube (1); the radial length of the clamping strip (2) in the clamping tube (1) is greater than the depth of the clamping groove (12); adjacent clamping strips (2) in the circumferential direction are fixedly connected by elastic bags (3); the elastic bags (3) are connected to the side of the clamping strip (2) and close to the center of the clamping tube (1); a first air hole (21) is provided in the clamping strip (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 bag (3); the deflated elastic bag (3) expands under pressure and fills the gap between adjacent clamping strips (2).

2. A pneumatic clamping device for boring thin-walled cylinder sleeves according to claim 1, characterized in that: One end of the clamping strip (2) close to the bottom of the clamping groove (12) is connected to the bottom of the clamping groove (12) via a first spring (22); the elastic bag (3) expands after the clamping strip (2) extends to the clamping groove (12); and the clamping strip (2) retracts to the corresponding clamping groove (12) after the elastic bag (3) shrinks.

3. A pneumatic clamping device for boring a thin-walled cylinder liner according to claim 1, characterized in that: The vertical side surface of the clamping strip (2) is provided with an inclined groove (23); the inclined plate (4) is slidably connected in the inclined groove (23); the inclined plates (4) on both sides of the clamping strip (2) are symmetrically distributed in an eight-shaped shape; the inclined plate (4) is connected to the bottom of the inclined groove (23) through a second spring (41); the end of the inclined plate (4) away from the second spring (41) faces the central axis of the clamping tube (1); the inclined plates (4) on the circumferentially adjacent clamping strips (2) extend out of the inclined groove (23) and then contact each other; the distance between the elastic bag (3) and the central axis of the clamping tube (1) is smaller than the distance between the inclined plate (4) and the central axis of the clamping tube (1).

4. A pneumatic clamping device for boring a thin-walled cylinder liner according to claim 3, characterized in that: One of the inclined plates (4) on the clamping strip (2) is provided with a convex strip (42) at one end away from the corresponding second spring (41); another inclined plate (4) on the clamping strip (2) is provided with a groove (43) at one end away from the corresponding second spring (41); the groove (43) is adapted to the shape of the convex strip (42); the convex strips (42) and the grooves (43) at the ends of the inclined plates (4) on the circumferentially adjacent clamping strips (2) are plugged into each other.

5. A pneumatic clamping device for boring thin-walled cylinder sleeves according to claim 3, characterized in that: The bottom of the inclined groove (23) is in communication with the first air hole (21); the gas in the first air hole (21) can enter the inclined groove (23); and the inclined plate (4) is connected to the inclined groove (23) in a sliding and sealing manner.

6. A pneumatic clamping device for boring thin-walled cylinder sleeves according to claim 1, characterized in that: The inner wall of the clamping tube (1) is provided with an upper retaining groove (15); the upper retaining groove (15) is located directly above the clamping groove (12) and is arranged close thereto; the upper retaining groove (15) is slidingly and sealingly connected to the upper retaining plate (5); the outer wall of the clamping tube (1) is fixedly connected to the upper ring tube (6); the upper ring tube (6) is connected to the upper air pipe (61) and the upper retaining groove (15); the upper retaining plate (5) is located directly above the corresponding elastic bag (3) after extending out of the upper retaining groove (15); The inner wall of the clamping tube (1) is provided with a lower retaining groove (16); the lower retaining groove (16) is located directly below the clamping groove (12) and is arranged close to each other; the lower retaining groove (16) is connected to the lower retaining plate (7) in a sliding seal; the outer wall of the clamping tube (1) is fixedly connected to the lower annular tube (8); the lower annular tube (8) is connected to the lower air pipe (81) and the lower retaining groove (16).

7. A pneumatic clamping device for boring a thin-walled cylinder liner according to claim 5, characterized in that: The natural length of the elastic bag (3) in the circumferential direction of the clamping tube (1) is smaller than the distance between adjacent clamping strips (2) in the circumferential direction of the clamping tube (1); after the clamping strip (2) extends out of the corresponding clamping groove (12), the elastic bag (3) is in a pulling state in the circumferential direction of the clamping tube (1).

8. A pneumatic clamping device for boring a thin-walled cylinder liner according to claim 1, characterized in that: The thickness of the elastic bag (3) is arranged to vary in the vertical direction; the thickness of the elastic bag (3) in the vertical direction increases as it moves away from the middle position.

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