A self-centering fixture for the inner wall of a cylinder bottom

Abstract

The utility model discloses a kind of self-centering clamps of cylinder bottom inner wall, including chassis, fixed on the limiting cylinder of chassis, the centering mechanism installed in the limiting cylinder;Centering mechanism includes support rod, ring, shaft, locating plate and driving mechanism, the lower end of support rod is fixedly connected in the limiting cylinder, ring is fixedly connected on the upper end of support rod, shaft is rotatably connected in ring, the both ends of shaft are fixedly connected with locating plate, the center of locating plate is connected with the end surface of shaft, the both ends of locating plate can extend outward, the midpoint of shaft is located on the vertical line where the center of limiting cylinder is, driving mechanism is installed on the limiting cylinder, and driving mechanism is used to drive shaft rotation.The utility model can make cylinder bottom centering, and clamping from cylinder bottom inside, conducive to subsequent processing.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, specifically a self-centering clamp for the inner wall of a cylinder bottom. Background Technology

[0002] In machining, when performing turning, milling, or drilling operations on the bottom of thin-walled cylindrical workpieces (such as engine blocks and hydraulic cylinders), a high-precision fixture is required for clamping and positioning. Traditional clamping methods often employ external chucks or internal expansion clamps. External chuck clamping can easily cause deformation of thin-walled workpieces due to clamping force, affecting machining accuracy. Furthermore, external clamping results in excessive coverage of the outer wall, which is detrimental to machining. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a self-centering fixture for the inner wall of the cylinder bottom that is compact in structure, has high centering accuracy, and is easy to operate.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A self-centering clamp for the inner wall of a cylinder bottom includes a chassis, a limiting cylinder fixed on the chassis, and a centering mechanism installed inside the limiting cylinder. The centering mechanism includes a support rod, a ring sleeve, a shaft, a positioning plate, and a driving mechanism. The lower end of the support rod is fixedly connected to the inside of the limiting cylinder, the ring sleeve is fixedly connected to the upper end of the support rod, the shaft is rotatably connected to the ring sleeve, and positioning plates are fixedly connected to both ends of the shaft. The center of the positioning plate is connected to the end face of the shaft, and both ends of the positioning plate can extend outward. The midpoint of the shaft is located on the vertical line of the center of the limiting cylinder. The driving mechanism is installed on the limiting cylinder and is used to drive the shaft to rotate.

[0005] Preferably, the lower part of the limiting cylinder has a cavity, and the driving mechanism includes a first bevel gear, a first transmission rod, a second bevel gear, a third bevel gear, a second transmission rod, a fourth bevel gear, and a first handle. The first bevel gear is fixedly connected to the shaft, the lower end of the first transmission rod is rotatably connected to the limiting cylinder, the upper end of the first transmission rod is fixedly connected to the second bevel gear, the first bevel gear meshes with the second bevel gear, the lower end of the first moving rod extends into the cavity, and the extended end is fixedly connected to the third bevel gear, the second transmission rod is located in the cavity, one end of which is fixedly connected to the fourth bevel gear, the fourth bevel gear meshes with the third bevel gear, the other end of the second transmission rod is rotatably connected to the side wall of the limiting cylinder, and this end protrudes from the limiting cylinder, and the protruding end is fixedly connected to the first handle.

[0006] In the above technical solution, rotating the first handle drives the second transmission rod to rotate, the second transmission rod drives the fourth bevel gear to rotate, and through cooperation with the third bevel gear, drives the first transmission rod to rotate. The first transmission rod drives the second bevel gear to rotate, and through cooperation with the first bevel gear, drives the shaft to rotate, thereby driving the positioning plate to rotate, so as to clamp the inner wall of the cylinder bottom through the positioning plate.

[0007] Preferably, the positioning plate includes a plate body, a positioning block, and positioning bolts. The center of the plate body is fixedly connected to the end face of the shaft. The two ends of the plate body are provided with slots. One end of the positioning block is provided with an insert block, which is inserted into the slot. The end face of the positioning block away from the insert block is an arc surface. A strip hole is opened on the insert block. Positioning holes matching the strip holes on both sides of the plate body are opened. The insert block is fixed in the slot by the cooperation of the positioning bolts with the positioning holes and the strip holes.

[0008] The above technical solution involves measuring the inner diameter of the cylinder bottom before fixing it, and then adjusting the position of the positioning blocks according to the inner diameter of the cylinder bottom so that the distance between the two positioning blocks and the shaft is equal. At the same time, the total length of the positioning plate is equal to or slightly greater than the inner diameter of the cylinder bottom. In this way, when the positioning plate is rotated to the horizontal or extreme position, both ends of the positioning plate are in contact with the inner wall of the cylinder bottom, thereby achieving clamping from the inner wall of the cylinder bottom.

[0009] Preferably, the outer wall of the positioning block is inlaid with an elastic wear-resistant pad.

[0010] The above technical solution has two advantages: firstly, the wear-resistant pad can reduce wear on the inner wall of the cylinder bottom; secondly, the wear-resistant pad is elastic and has resilience. When the positioning block squeezes the inner wall of the cylinder bottom, it will squeeze the wear-resistant pad and cause it to shrink. When the positioning plate rotates to the limit position, the wear-resistant pad will give the cylinder bottom an outward expansion force, which is conducive to the stable clamping of the cylinder bottom.

[0011] Preferably, the outer periphery of the chassis has several fixing holes.

[0012] The above technical solution allows the chassis, i.e., the fixture, to be fixed to the base surface by bolts passing through the fixing holes.

[0013] Preferably, the side wall of the limiting cylinder is provided with several grooves, each groove is provided with a screw hole, a screw rod is threaded into the screw hole, a second handle is connected to the outer end of the screw rod, and a clamping plate is connected to the inner end of the screw rod, the clamping plate is located in the groove.

[0014] In the above technical solution, after the cylinder bottom is positioned from the inner wall by the centering mechanism, the second handle is rotated in sequence to clamp the outer wall of the cylinder bottom through the clamping plate, thereby achieving clamping of the inner and outer sides of the cylinder bottom at the same time.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Before being placed into the cylinder bottom, the positioning plate is in a vertical position. When positioning the cylinder bottom, the lower part of the cylinder bottom is placed into the limiting cylinder, so that the positioning plate is located inside the cylinder bottom. Then, the shaft is rotated by the drive mechanism, so that the positioning plate rotates around the center of the shaft. The cylinder bottom is pressed by the ends of the positioning plate, so that the cylinder bottom is gradually centered until both ends of the positioning plate are in contact with the inner wall of the cylinder bottom. At this time, the cylinder bottom is in the centered position, which realizes clamping from the inside of the cylinder bottom, which is beneficial for subsequent processing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention; Figure 2 A cross-sectional view of this utility model; Figure 3 A schematic diagram of the centering mechanism; Figure 4 An exploded view of the positioning mechanism's motion; In the diagram: 1-chassis, 2-limiting cylinder, 3-support rod, 4-ring sleeve, 5-shaft rod, 6-positioning plate, 601-plate body, 602-positioning block, 603-positioning bolt, 604-insertion block, 605-strip hole, 606-wear-resistant pad, 7-cavity, 8-first bevel gear, 9-first transmission rod, 10-second bevel gear, 11-third bevel gear, 12-second transmission rod, 13-fourth bevel gear, 14-first handle, 15-fixing hole, 16-groove, 17-screw, 18-second handle, 19-clamping plate, 20-cylinder bottom. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 Please see Figure 1-3 A self-centering clamp for the inner wall of a cylinder bottom includes a chassis 1, a limiting cylinder 2 fixed on the chassis 1, and a centering mechanism installed inside the limiting cylinder 2. The chassis and the limiting cylinder are concentrically arranged. Several fixing holes 15 are provided on the outer periphery of the chassis 1, and the chassis 1 is fixed to the required position, such as any reference surface, by bolts.

[0019] The centering mechanism includes a support rod 3, a ring 4, a shaft 5, a positioning plate 6, and a drive mechanism. The lower end of the support rod 3 is fixedly connected to the bottom of the limiting cylinder 2. The ring 4 is laterally fixedly connected to the upper end of the support rod 3. The shaft 5 is rotatably connected to the ring 4 via bearings. Positioning plates 6 are fixedly connected to both ends of the shaft 5. Specifically, the center of the positioning plate 6 is connected to the end face of the shaft 5. The two ends of the positioning plate 6 can extend outward to accommodate cylinder bottoms of different inner diameters. The midpoint of the shaft 5 is located on the vertical line of the center of the limiting cylinder 2, so the central axes of the two positioning plates coincide with the straight line of the center of the limiting cylinder. When the shaft rotates, it drives the positioning plates to rotate together. When the positioning plates rotate to the horizontal or extreme angle, the cylinder bottom is centered.

[0020] The lower part of the limiting cylinder 2 is provided with a cavity 7, and the driving mechanism is installed on the limiting cylinder 2 to drive the shaft 5 to rotate. The driving mechanism includes a first bevel gear 8, a first transmission rod 9, a second bevel gear 10, a third bevel gear 11, a second transmission rod 12, a fourth bevel gear 13, and a first handle 14. The first bevel gear 8 is fixedly connected to the shaft 5. The lower end of the first transmission rod 9 is rotatably connected to the limiting cylinder 2. The upper end of the first transmission rod 9 is fixedly connected to the second bevel gear 10. The first bevel gear 8 and the second bevel gear 10 mesh. The lower end of the first transmission rod 9 extends into the cavity 7, and the extended end is fixedly connected to the third bevel gear 11. The second transmission rod 12 is located in the cavity 7, and one end of it is fixedly connected to the fourth bevel gear 13. The fourth bevel gear 13 meshes with the third bevel gear 11. The other end of the second transmission rod 12 is rotatably connected to the side wall of the limiting cylinder 2, and this end protrudes from the limiting cylinder 2. The protruding end is fixedly connected to the first handle 14. By rotating the first handle 14, the second transmission rod 12 is driven to rotate. The second transmission rod 12 drives the fourth bevel gear 13 to rotate. The fourth bevel gear 13, through its engagement with the third bevel gear 11, drives the first transmission rod 9 to rotate. The first transmission rod 9 drives the second bevel gear 10 to rotate. The second bevel gear 10, through its engagement with the first bevel gear 8, drives the shaft 5 to rotate, thereby driving the positioning plate 6 to rotate, so as to clamp the inner wall of the cylinder bottom through the positioning plate 6.

[0021] The positioning plate 6 includes a plate body 601, a positioning block 602, and a positioning bolt 603. The center of the plate body 601 is fixedly connected to the end face of the shaft 5. The plate body 601 has slots at both ends. The positioning block 602 has an insertion block 604 at one end, which is inserted into the slot. The end face of the positioning block 602 away from the insertion block is an arc surface. The insertion block 604 has a strip hole 605. The plate body 601 has positioning holes on both sides that match the strip hole 605 on each side. The insertion block 604 is fixed in the slot by the cooperation of the positioning bolt 603 with the positioning hole and the strip hole 605. Before fixing the cylinder bottom, first measure the inner diameter of the cylinder bottom, and then adjust the position of the positioning blocks according to the inner diameter of the cylinder bottom so that the distance between the two positioning blocks 602 and the shaft 5 is equal. At the same time, make the total length of the positioning plate 6 equal to or slightly greater than the inner diameter of the cylinder bottom. In this way, when the positioning plate 6 is rotated to the horizontal or extreme position, the two ends of the positioning plate 6 just contact the inner wall of the cylinder bottom, thereby achieving clamping from the inner wall of the cylinder bottom.

[0022] The outer wall of the positioning block 602 is inlaid with a wear-resistant pad 606. On the one hand, the wear-resistant pad can reduce the wear on the inner wall of the cylinder bottom; on the other hand, the wear-resistant pad is elastic and has resilience. When the positioning block squeezes the inner wall of the cylinder bottom, it will squeeze the wear-resistant pad and cause the wear-resistant pad to shrink. When the positioning plate rotates to the limit position, the wear-resistant pad will give the cylinder bottom an outward expansion force, which is conducive to the stable clamping of the cylinder bottom.

[0023] The working principle of this embodiment is as follows:

[0024] like Figure 4 As shown, the positioning plate 6 is in a vertical position before the cylinder bottom 20 is placed in. When positioning the cylinder bottom 20, the lower part of the cylinder bottom 20 is placed into the limiting cylinder 2, so that both positioning plates 6 are located inside the cylinder bottom 20. Then, the first handle 14 is turned to drive the shaft 5 to rotate, so that the positioning plate 6 rotates around the center of the shaft 5. When the positioning plate 6 rotates, its end will press against the inner wall of the cylinder bottom, so that the cylinder bottom gradually centers until both ends of the positioning plate 6 are in close contact with the inner wall of the cylinder bottom. At this time, the cylinder bottom is in the centered position, realizing clamping from the inside of the cylinder bottom, which is beneficial for subsequent processing.

[0025] Example 2 Based on Embodiment 1, the side wall of the limiting cylinder 2 is provided with several grooves 16, each groove 16 having a threaded hole. A screw 17 is threaded into the threaded hole, the outer end of the screw 17 is connected to a second handle 18, and the inner end of the screw 17 is connected to a clamping plate 19, which is located within the groove 16. After the cylinder bottom is positioned from the inner wall by the centering mechanism, rotating all the second handles 18 in sequence allows the clamping plate 19 to clamp the outer wall of the cylinder bottom, thereby achieving simultaneous clamping of the inner and outer sides of the cylinder bottom, making the cylinder bottom more stable.

[0026] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-centering clamp for the inner wall of a cylinder bottom, characterized in that, Includes a chassis (1), a limiting cylinder (2) fixed on the chassis (1), and a centering mechanism installed inside the limiting cylinder (2); The centering mechanism includes a support rod (3), a ring sleeve (4), a shaft (5), a positioning plate (6), and a driving mechanism. The lower end of the support rod (3) is fixedly connected to the limiting cylinder (2). The ring sleeve (4) is fixedly connected to the upper end of the support rod (3). The shaft (5) is rotatably connected to the ring sleeve (4). The two ends of the shaft (5) are fixedly connected to the positioning plate (6). The center of the positioning plate (6) is connected to the end face of the shaft (5). The two ends of the positioning plate (6) can extend outward. The midpoint of the shaft (5) is located on the vertical line where the center of the limiting cylinder (2) is located. The driving mechanism is installed on the limiting cylinder (2) and is used to drive the shaft (5) to rotate.

2. The self-centering clamp for the inner wall of a cylinder bottom according to claim 1, characterized in that, The lower part of the limiting cylinder (2) is provided with a cavity (7). The driving mechanism includes a first bevel gear (8), a first transmission rod (9), a second bevel gear (10), a third bevel gear (11), a second transmission rod (12), a fourth bevel gear (13), and a first handle (14). The first bevel gear (8) is fixedly connected to the shaft (5). The lower end of the first transmission rod (9) is rotatably connected to the limiting cylinder (2). The upper end of the first transmission rod (9) is fixedly connected to the second bevel gear (10). 8) Engages with the second bevel gear (10), the lower end of the first transmission rod (9) extends into the cavity (7), and the extended end is fixedly connected to the third bevel gear (11). The second transmission rod (12) is located in the cavity (7), and one end of it is fixedly connected to the fourth bevel gear (13). The fourth bevel gear (13) meshes with the third bevel gear (11). The other end of the second transmission rod (12) is rotatably connected to the side wall of the limiting cylinder (2), and this end passes through the limiting cylinder (2), and the passing end is fixedly connected to the first handle (14).

3. A self-centering clamp for the inner wall of a cylinder bottom according to claim 2, characterized in that, The positioning plate (6) includes a plate body (601), a positioning block (602), and a positioning bolt (603). The center of the plate body (601) is fixedly connected to the end face of the shaft (5). The two ends of the plate body (601) are provided with slots. One end of the positioning block (602) is provided with an insert (604). The insert (604) is inserted into the slot. The end face of the positioning block (602) away from the insert is an arc surface. The insert (604) is provided with a strip hole (605). The two sides of the plate body (601) are provided with positioning holes that match the strip hole (605) on their respective sides. The insert (604) is fixed in the slot by the cooperation of the positioning bolt (603) with the positioning hole and the strip hole (605).

4. A self-centering clamp for the inner wall of a cylinder bottom according to claim 3, characterized in that, The outer wall of the positioning block (602) is inlaid with a wear-resistant pad (606).

5. A self-centering clamp for the inner wall of a cylinder bottom according to claim 4, characterized in that, The chassis (1) has several fixing holes (15) on its periphery.

6. A self-centering fixture for the inner wall of a cylinder bottom according to claim 5, characterized in that, The side wall of the limiting cylinder (2) is provided with several grooves (16), and each groove (16) is provided with a screw hole. A screw rod (17) is threaded into the screw hole. A second handle (18) is connected to the outer end of the screw rod (17). A clamping plate (19) is connected to the inner end of the screw rod (17). The clamping plate (19) is located in the groove (16).

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