A calibrating device for piston rods
By using a piston rod calendering and straightening device, the multi-directional residual stress of the piston rod is eliminated through the combined motion trajectory of the rotating mechanism and the straightening roller, thus solving the bending problem caused by material or internal stress, improving product quality and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGYIN PUFIKE HYDRAULIC EQUIPMENT CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-06-26
AI Technical Summary
During the piston rod manufacturing process, bending occurs due to the inability to eliminate material or internal stress. Existing annealing treatments are costly and have inconsistent quality.
A piston rod calendering and straightening device is adopted. The mounting box is driven to slide circumferentially along the fixed gear by a rotating mechanism. Combined with the composite motion trajectory of the straightening roller, it covers the entire circumferential stress area of the piston rod and eliminates multi-directional residual stress.
It effectively eliminates bending problems during piston rod processing, improves product quality stability, reduces production costs, and reduces the labor intensity of workers.
Smart Images
Figure CN224406102U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of piston rod processing technology, and in particular to a piston rod calendering and straightening device. Background Technology
[0002] The piston rod is the connecting component that supports the piston in performing work. It is mostly used in hydraulic cylinders and pneumatic cylinders. It is a moving component with frequent movement and high technical requirements.
[0003] To ensure quality, piston rods undergo strict requirements regarding material hardness, tensile strength, and chemical composition during production, as well as high demands on dimensional and surface precision. However, bending can still occur during processing due to unresolved material or internal stress. The current standard practice is to anneal the material to fully eliminate residual stress within the piston rod, preventing deformation and cracking. However, this increases production costs, and improper annealing can actually lower product quality, leading to inconsistent piston rod quality, high labor intensity for workers, and high costs. Utility Model Content
[0004] To improve the problem of piston rod bending during processing due to the inability to eliminate material or internal stress, this application provides a piston rod calendering and straightening device.
[0005] The piston rod straightening and calendering device provided in this application adopts the following technical solution:
[0006] A piston rod calendering and straightening device includes a base plate, a fixed frame on the base plate, a fixed gear connected to the fixed frame, the fixed gear being arranged in a two-thirds annular shape, the center of the fixed gear being collinear with the axis of the piston rod during processing, a mounting box slidably mounted on the fixed gear, a rotating mechanism on the mounting box for driving the mounting box to rotate circumferentially along the fixed gear, two mounting blocks slidably mounted below the mounting box, an adjusting component on the mounting box for driving the two mounting blocks closer or further apart, a straightening motor connected to the mounting blocks, and a straightening roller connected to the output shaft of the straightening motor.
[0007] Preferably, a support rod is fixedly connected to the mounting box. The support rod is arranged in a direction perpendicular to the side wall of the mounting box. Two support rods are provided on the mounting box. A sliding groove is provided on the fixed gear for the support rod to pass through and slide. The sliding groove is arranged around the circumference of the fixed gear. The side wall of the support rod slides against the inner wall of the sliding groove. A fixing plate is fixedly connected to the end of the support rod that passes through the sliding groove. The surface of the fixing plate slides against the surface of the fixed gear.
[0008] Preferably, the rotating mechanism includes a mounting plate, a first bearing, a rotating rod, a rotating gear, and a rotating motor. The mounting plate is fixedly connected to the mounting box, the first bearing is mounted on the mounting plate, the rotating rod is connected inside the first bearing, the rotating motor is mounted on the top of the mounting box, the output shaft of the rotating motor is coaxially connected to the rotating rod via a coupling, the rotating gear is connected to the end of the rotating rod away from the rotating motor, and the rotating gear and the fixed gear mesh with each other.
[0009] Preferably, the adjusting assembly includes a second bearing, a bidirectional threaded rod, a nut seat, and an adjusting motor. The mounting box is hollow. The second bearing is connected to the mounting box, and one second bearing is respectively located on two opposite side walls of the mounting box. The bidirectional threaded rod is connected between the two second bearings. The adjusting motor is mounted on the side wall of the mounting box. The output shaft of the adjusting motor is coaxially connected to the bidirectional threaded rod via a coupling. The nut seat is connected to the bidirectional threaded rod, and one nut seat is respectively located on the bidirectional thread of the bidirectional threaded rod. The nut seat is connected to the mounting block. The mounting box has a through groove for the mounting block to pass through and slide. The side wall of the mounting block slides against the inner wall of the through groove.
[0010] Preferably, the mounting block is arranged in an "I" shape, and the side wall of the mounting block is slidably engaged in the through groove.
[0011] Preferably, the mounting box has an inspection port, and an inspection door is bolted to the inspection port.
[0012] In summary, this application includes the following beneficial technical effects:
[0013] This utility model provides a piston rod calendering and straightening device. Through a rotating mechanism, the mounting box is driven to slide back and forth along the circumference of the fixed gear, realizing the planetary revolution of the straightening roller around the piston rod axis. Combined with the rotation of the straightening roller, a composite motion trajectory is formed, covering the entire circumferential stress area of the piston rod. Compared with the traditional unidirectional roller pressing process, this design can form a spiral progressive compressive stress field in the entire circumference of the workpiece, effectively eliminating multi-directional residual stress, thereby improving the problem of piston rod bending during processing due to the inability to eliminate material or internal stress. Attached Figure Description
[0014] Figure 1 This is a first-view view of the piston rod calendering and straightening device in the embodiments of this application;
[0015] Figure 2 This is a second-view view of the calendering and straightening device for the piston rod in the embodiments of this application;
[0016] Figure 3 This is a perspective view of the internal structure of the mounting box in an embodiment of this application.
[0017] Explanation of reference numerals in the attached drawings: 1. Base plate; 11. Fixing frame; 2. Fixing gear; 21. Slide groove; 3. Mounting box; 31. Support rod; 311. Fixing plate; 32. Inspection door; 4. Rotating mechanism; 41. Mounting plate; 42. First bearing; 43. Rotating rod; 44. Rotating gear; 45. Rotating motor; 5. Mounting block; 51. Straightening motor; 511. Straightening roller; 6. Adjusting assembly; 61. Second bearing; 62. Bidirectional threaded rod; 63. Nut seat; 64. Adjusting motor. Detailed Implementation
[0018] To enable those skilled in the art to better understand the present invention, the solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0020] This application discloses a calendering and straightening device for a piston rod. (Refer to...) Figure 1 and Figure 2 The piston rod pressing and straightening device includes a base plate 1, a fixed frame 11 on the base plate 1, a fixed gear 2 connected to the fixed frame 11, the fixed gear 2 being arranged in a two-thirds circular shape, the center of the fixed gear 2 being collinear with the axis of the piston rod during processing, a mounting box 3 being slidably mounted on the fixed gear 2, a rotating mechanism 4 being provided on the mounting box 3 for driving the mounting box 3 to rotate along the circumference of the fixed gear 2, two mounting blocks 5 being slidably mounted below the mounting box 3, an adjusting component 6 being provided on the mounting box 3 for driving the two mounting blocks 5 to move closer or further apart, a straightening motor 51 being connected to the mounting blocks 5, and a straightening roller 511 being connected to the output shaft of the straightening motor 51.
[0021] The mounting box 3 is driven by the rotating mechanism 4 to slide back and forth along the circumference of the fixed gear 2, so as to realize the planetary revolution of the straightening roller 511 around the piston rod axis. Combined with the rotation of the straightening roller 511, a composite motion trajectory is formed, which covers the entire circumferential stress area of the piston rod. Compared with the traditional unidirectional rolling process, this design can form a spiral progressive compressive stress field in the entire circumference of the workpiece, effectively eliminating multidirectional residual stress.
[0022] A support rod 31 is fixedly connected to the mounting box 3. The support rod 31 is arranged in a direction perpendicular to the side wall of the mounting box 3. There are two support rods 31 on the mounting box 3. A groove 21 is opened on the fixed gear 2 for the support rod 31 to pass through and slide. The groove 21 is arranged around the circumference of the fixed gear 2. The side wall of the support rod 31 slides against the inner wall of the groove 21. A fixing plate 311 is fixedly connected to the end of the support rod 31 that passes through the groove 21. The surface of the fixing plate 311 slides against the surface of the fixed gear 2.
[0023] The dual constraint mechanism formed by the support rod 31-slide groove 21 guide structure and the sliding of the fixing plate 311 ensures the stability of the mounting box 3 when it moves on the fixed gear 2. It can also be used in conjunction with a magnetorheological damper (not shown in this application) to absorb vibration energy and further improve the stability of the mounting box 3 when it moves.
[0024] The rotating mechanism 4 includes a mounting plate 41, a first bearing 42, a rotating rod 43, a rotating gear 44, and a rotating motor 45. The mounting plate 41 is fixedly connected to the mounting box 3. The first bearing 42 is mounted on the mounting plate 41. The rotating rod 43 is connected inside the first bearing 42. The rotating motor 45 is mounted on the top of the mounting box 3. The output shaft of the rotating motor 45 is coaxially connected to the rotating rod 43 through a coupling. The rotating gear 44 is connected to the end of the rotating rod 43 away from the rotating motor 45. The rotating gear 44 and the fixed gear 2 mesh with each other.
[0025] When the mounting box 3 moves, the rotating rod 43 and the rotating gear 44 are driven to rotate by the rotating motor 45. Through the cooperation of the rotating gear 44 and the fixed gear 2, the mounting box 3 moves back and forth along the slide groove 21 on the fixed gear 2, so that the straightening roller 511 revolves around the piston rod as the axis.
[0026] The adjusting assembly 6 includes a second bearing 61, a bidirectional threaded rod 62, a nut seat 63, and an adjusting motor 64. The mounting box 3 is hollow. The second bearing 61 is connected to the mounting box 3, and there is one second bearing 61 on each of the two opposite side walls of the mounting box 3. The bidirectional threaded rod 62 is connected between the two second bearings 61. The adjusting motor 64 is mounted on the side wall of the mounting box 3. The output shaft of the adjusting motor 64 is coaxially connected to the bidirectional threaded rod 62 through a coupling. The nut seat 63 is connected to the bidirectional threaded rod 62, and there is one nut seat 63 on each of the bidirectional threads of the bidirectional threaded rod 62. The nut seat 63 is connected to the mounting block 5. The mounting box 3 has a through groove for the mounting block 5 to pass through and slide. The side wall of the mounting block 5 slides against the inner wall of the through groove.
[0027] The position of the straightening roller 511 can be quickly adjusted by the cooperation of the bidirectional threaded rod 62, the nut seat 63 and the mounting block 5, so as to clamp the piston rod.
[0028] The mounting block 5 is shaped like an "I". The side wall of the mounting block 5 is slidably locked in the through groove. This arrangement helps to improve the stability of the mounting block 5 when it moves in the through groove.
[0029] The mounting box 3 has an inspection port, and an inspection door 32 is bolted to the inspection port. The inspection port and inspection door 32 facilitate the operator to maintain the inside of the mounting box 3.
[0030] The implementation principle of the piston rod calendering and straightening device in this application embodiment is as follows: When assembling the piston rod, the piston rod passes through the center of the fixed gear 2, and the piston rod is located between the two straightening rollers 511. Then, the adjusting motor 64 drives the bidirectional threaded rod 62 to rotate. With the cooperation of the mounting block 5 and the through groove, the nut seat 63 can move along the length direction of the bidirectional threaded rod 62. The two nut seats 63 move closer to each other, so that the straightening roller 511 abuts against the piston rod. Then, the straightening motor 51 and the rotating motor 45 are started at the same time. The rotating motor 45 drives the rotating rod 43 and the rotating gear 44 to rotate. Through the cooperation of the rotating gear 44 and the fixed gear 2, the mounting box 3 is driven to move back and forth along the sliding groove 21 on the fixed gear 2, so that the straightening roller 511 revolves around the piston rod as the axis. Combined with the rotation of the straightening roller 511, a compound motion trajectory is formed, covering the entire circumferential stress area of the piston rod.
[0031] Finally, it should be noted that the above description is only a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions within the scope of this utility model's concept are within the protection scope of this utility model. It should be pointed out that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A calendering and straightening device for a piston rod, characterized in that: Includes a base plate (1), on which a fixing frame (11) is provided, and a fixing gear (2) is connected to the fixing frame (11). The fixing gear (2) is arranged in a two-thirds circular shape, and the center of the fixing gear (2) is collinear with the axis of the piston rod during processing. A mounting box (3) is slidably arranged on the fixing gear (2). A rotating mechanism (4) for driving the mounting box (3) to rotate around the fixing gear (2) is provided on the mounting box (3). Two mounting blocks (5) are slidably arranged below the mounting box (3). An adjusting component (6) for driving the two mounting blocks (5) to move closer or further away from each other is provided on the mounting box (3). A straightening motor (51) is connected to the mounting block (5), and a straightening roller (511) is connected to the output shaft of the straightening motor (51).
2. The piston rod calendering and straightening device according to claim 1, characterized in that: A support rod (31) is fixedly connected to the mounting box (3). The support rod (31) is arranged in a direction perpendicular to the side wall of the mounting box (3). There are two support rods (31) on the mounting box (3). A groove (21) is opened on the fixed gear (2) for the support rod (31) to pass through and slide. The groove (21) is arranged along the circumference of the fixed gear (2). The side wall of the support rod (31) slides against the inner wall of the groove (21). A fixing plate (311) is fixedly connected to the end of the support rod (31) that passes through the groove (21). The plate surface of the fixing plate (311) slides against the surface of the fixed gear (2).
3. The piston rod calendering and straightening device according to claim 1, characterized in that: The rotating mechanism (4) includes a mounting plate (41), a first bearing (42), a rotating rod (43), a rotating gear (44), and a rotating motor (45). The mounting plate (41) is fixedly connected to the mounting box (3). The first bearing (42) is mounted on the mounting plate (41). The rotating rod (43) is connected inside the first bearing (42). The rotating motor (45) is mounted on the top of the mounting box (3). The output shaft of the rotating motor (45) is coaxially connected to the rotating rod (43) through a coupling. The rotating gear (44) is connected to the end of the rotating rod (43) away from the rotating motor (45). The rotating gear (44) and the fixed gear (2) mesh with each other.
4. The piston rod calendering and straightening device according to claim 1, characterized in that: The adjustment assembly (6) includes a second bearing (61), a bidirectional threaded rod (62), a nut seat (63), and an adjustment motor (64). The mounting box (3) is hollow. The second bearing (61) is connected to the mounting box (3). The second bearing (61) is provided on two opposite side walls of the mounting box (3). The bidirectional threaded rod (62) is connected between the two second bearings (61). The adjustment motor (64) is installed on the side wall of the mounting box (3). The output shaft of the adjustment motor (64) is coaxially connected to the bidirectional threaded rod (62) through a coupling. The nut seat (63) is connected to the bidirectional threaded rod (62). The nut seat (63) is provided on the bidirectional thread of the bidirectional threaded rod (62). The nut seat (63) is connected to the mounting block (5). The mounting box (3) has a through groove for the mounting block (5) to pass through and slide. The side wall of the mounting block (5) slides against the inner wall of the through groove.
5. The piston rod calendering and straightening device according to claim 4, characterized in that: The mounting block (5) is arranged in an "I" shape, and the side wall of the mounting block (5) is slidably engaged in the through groove.
6. The piston rod calendering and straightening device according to claim 4, characterized in that: The installation box (3) is provided with an inspection port, and an inspection door (32) is connected to the inspection port by bolts.