A piston rod centering guide

Abstract

The application provides a piston rod centering guide device, comprising: a fixed frame with a through hole; a fixed ring arranged on the fixed frame and in line with the axis of the through hole, the fixed ring being provided with a fixing unit for fixing a cylinder body; a centering unit comprising two oppositely arranged centering plates and a driving assembly for driving the two centering plates to move, the two centering plates being arranged on opposite sides of the fixed ring and moving in a direction towards or away from the axis of the fixed ring to guide and center the piston rod entering the fixed ring, so that the piston rod is coaxial with the cylinder body, thereby avoiding collision between the piston rod and the end of the cylinder body during insertion. The application can effectively guide and center the piston rod during installation, reduce the workload of manual support and adjustment, reduce labor intensity, improve the assembly efficiency of the piston rod and the cylinder body, and reduce the risk of damage to the piston rod due to inaccurate centering.

Description

Technical Field

[0001] This invention relates to the field of piston rod processing technology, and more specifically to a piston rod centering guide device. Background Technology

[0002] Hydraulic cylinders are common actuators widely used in engineering machinery, metallurgical equipment, mining machinery, and other fields. A hydraulic cylinder typically consists of a cylinder body, a piston, and a piston rod. The piston rod is inserted into the cylinder body from one end and connects to the piston to achieve reciprocating motion. During the assembly of a hydraulic cylinder, the piston rod must be accurately inserted into the cylinder body, ensuring that the piston rod and cylinder body remain coaxial to avoid misalignment or collision during installation.

[0003] For piston rods with large diameters and heavy weights, installation typically requires the use of hoisting equipment to lift the piston rod, followed by manual support and adjustment to align it with the mounting hole at the cylinder end before slowly inserting it into the cylinder. However, due to the large mass and length of the piston rod, it is prone to swaying during hoisting, making manual alignment difficult and often requiring multiple operators. This not only increases labor intensity but also reduces assembly efficiency. Furthermore, if the piston rod and cylinder body are not properly coaxial during manual alignment, they are prone to colliding with the cylinder end or guide structure during insertion, resulting in scratches or damage to the piston rod surface and affecting the assembly quality and service life of the hydraulic cylinder. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a piston rod alignment guide device. This device solves the problem that in existing technologies, piston rod installation mainly relies on hoisting equipment and manual labor to support and adjust the piston rod to align it with the cylinder. This process is not only time-consuming and labor-intensive, but also prone to causing collisions between the piston rod and the cylinder end when the alignment is inaccurate, resulting in damage to the piston rod.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A piston rod centering guide device, comprising:

[0007] The mounting bracket has through holes;

[0008] A retaining ring is provided on the retaining frame and is collinear with the axis of the through hole. The retaining ring is provided with a retaining unit for fixing the cylinder body.

[0009] The centering unit includes two opposing centering plates and a drive assembly that drives the two centering plates to move. The two centering plates are respectively located on opposite sides of the fixed ring and move in a direction toward or away from the axis of the fixed ring to guide and center the piston rod entering the fixed ring, so that the piston rod is coaxial with the cylinder.

[0010] Furthermore, the centering plate has a V-shaped groove on the side facing the piston rod, and rollers are provided on the two opposite walls of the V-shaped groove, and the rolling direction of the rollers is consistent with the moving direction of the piston rod.

[0011] Furthermore, the drive assembly includes a mounting bracket disposed on the top of the fixed frame and a telescopic device disposed on the mounting bracket, wherein the centering plate is slidably engaged on the mounting bracket and connected to the telescopic end of the telescopic device.

[0012] Furthermore, the fixing unit includes a plurality of fixing members distributed circumferentially along the fixing ring and a driving member. The driving member is disposed within the fixing ring and is connected in a transmission manner to the plurality of fixing members to drive the plurality of fixing members to move synchronously along the radial direction of the fixing ring.

[0013] Furthermore, the fixing member includes an adjusting block that slides through the fixing ring and has a toothed groove on one side, and a fixing block located in the through hole and connected to one end of the adjusting block; the driving member includes a toothed ring that is rotatably engaged in the fixing ring and a gear that is rotatably disposed in the fixing ring, the gear meshing with the toothed ring and the toothed groove respectively.

[0014] Furthermore, the fixing unit also includes an adjusting component, which includes worm gear teeth formed on the outside of the gear ring and a worm that meshes with the worm gear teeth. The fixing ring is provided with a mounting shell, and the worm is rotatably mounted on the mounting shell.

[0015] Furthermore, one end of the worm gear passes through the mounting housing and is provided with an adjustment section.

[0016] Furthermore, the fixed frame is slidably provided with a support plate, which is used to support the cylinder body. A lifting component is also provided between the support plate and the bottom end of the fixed frame, which is used to drive the support plate to move along the height direction of the fixed frame.

[0017] Furthermore, the side of the support plate is provided with a slide, and pulleys are rotatably provided on both sides of the slide. The fixed frame is provided with a sliding groove, and the pulleys are rotatably connected to the sliding groove.

[0018] Furthermore, the lifting component is a hydraulic jack, with the fixed end of the hydraulic jack located at the bottom end of the fixed frame and the telescopic end located at the bottom end of the bearing plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By setting a fixing ring on the fixing frame and using a fixing unit to fix the cylinder body, the cylinder body is kept in a stable position during installation. Simultaneously, by setting a centering unit consisting of two centering plates and using a drive assembly to drive the two centering plates to move towards each other, the piston rod is limited and aligned, achieving coaxiality between the piston rod and the cylinder body, thereby preventing collision between the piston rod and the end of the cylinder body during insertion. Therefore, this invention can effectively guide and center the piston rod during installation, reducing the amount of manual support and adjustment work, lowering labor intensity, improving the assembly efficiency of the piston rod and cylinder body, and reducing the risk of piston rod damage due to inaccurate alignment. Attached Figure Description

[0021] Appendix Figure 1 This is a schematic diagram of the piston rod centering guide device in use in this embodiment.

[0022] Appendix Figure 2 : A schematic diagram of the piston rod centering guide device in this embodiment;

[0023] Appendix Figure 3 This embodiment presents a partial structural diagram of the piston rod centering guide device, mainly showing the centering unit;

[0024] Appendix Figure 4 This embodiment shows a cross-sectional view of the fixing ring in the piston rod centering guide device, mainly illustrating the fixing component and the driving component;

[0025] Appendix Figure 5 This is a cross-sectional structural diagram of the fixing component in the piston rod centering guide device of this embodiment, mainly showing the adjusting component;

[0026] Appendix Figure 6 : A front view structural schematic diagram of the piston rod centering guide device in this embodiment;

[0027] Explanation of icon numbers:

[0028] 10. Fixture; 101. Slide rail;

[0029] 20. Fixing ring;

[0030] 30. Center plate; 31. V-groove; 32. Roller;

[0031] 40. Drive assembly; 41. Mounting bracket; 42. Expansion joint;

[0032] 50. Fastener; 51. Adjusting block; 52. Fixing block;

[0033] 60. Driving component; 61. Gear ring; 62. Gear;

[0034] 70. Adjusting component; 71. Worm gear; 72. Worm; 73. Mounting housing; 74. Adjusting part;

[0035] 80. Load-bearing plate; 81. Carriage; 82. Pulley;

[0036] 90. Lifting components.

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the technical solutions of this invention are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0039] like Figure 1-6 As shown in the figure, an embodiment of the present invention proposes a piston rod centering guide device, comprising: a fixing frame 10 having a through hole; a fixing ring 20 disposed on the fixing frame 10 and collinear with the axis of the through hole, the fixing ring 20 having a fixing unit for fixing the cylinder body; and a centering unit comprising two opposing centering plates 30 and a driving assembly 40 for driving the two centering plates 30 to move respectively, the two centering plates 30 being disposed on opposite sides of the fixing ring 20 and moving in a direction toward or away from the axis of the fixing ring 20 to guide and center the piston rod entering the fixing ring 20, so that the piston rod is coaxial with the cylinder body.

[0040] Specifically, in use, the cylinder body is first fixed to the fixing ring 20 using a fixing unit, ensuring that the cylinder body and the fixing ring 20 are aligned on the same axis. Then, the piston rod is lifted using a hoisting device and positioned above the fixing ring 20. Next, the two centering plates 30 are moved towards each other using a drive assembly 40, guiding and adjusting the piston rod to gradually move it to the axial position of the fixing ring 20, thus ensuring the piston rod is coaxial with the cylinder body. Once the piston rod is guided to the coaxial position with the fixing ring 20, it is then moved into the cylinder body using the hoisting device for installation.

[0041] This invention, by incorporating a centering unit, guides and centers the piston rod before it enters the cylinder body. This not only reduces manual support and adjustment but also prevents the piston rod from colliding with the cylinder end during installation, minimizing the risk of surface damage. Simultaneously, the centering unit continuously guides the piston rod during installation, thereby improving assembly smoothness.

[0042] In addition, such as Figure 3 As shown in this embodiment of the invention, the centering plate 30 has a V-groove 31 on the side facing the piston rod. Rollers 32 are provided on both opposite walls of the V-groove 31, and the rolling direction of the rollers 32 is consistent with the moving direction of the piston rod. By providing the V-groove 31 on the centering plate 30, when the piston rod enters between the two centering plates 30 during hoisting and movement, the V-groove 31 can guide the piston rod, causing it to gradually move towards the center position of the V-groove 31. This gradually adjusts the position of the piston rod to be aligned with the axis of the fixing ring 20, improving the centering effect of the piston rod. Furthermore, the V-groove 31 can accommodate piston rods of different diameters.

[0043] Meanwhile, rollers 32 are installed on the wall of the V-groove 31, and the rolling direction of the rollers 32 is consistent with the moving direction of the piston rod. This allows the piston rod to form rolling contact with the rollers 32 during axial movement, thus guiding the piston rod without hindering its axial movement. This allows the piston rod to move smoothly into the cylinder body for installation, avoiding scratches or wear on the piston rod surface due to friction.

[0044] Specifically, such as Figure 3-5 As shown, in this embodiment of the invention, the drive assembly 40 includes a mounting bracket 41 disposed on the top of the fixed frame 10 and a telescoping device 42 disposed on the mounting bracket 41. The centering plate 30 is slidably engaged on the mounting bracket 41 and connected to the telescoping end of the telescoping device 42. By controlling the telescoping device 42 to extend and retract, the telescoping end of the telescoping device 42 drives the centering plate 30 to move along the sliding direction of the mounting bracket 41, thereby allowing the two centering plates 30 to move closer to each other to adjust the position of the piston rod, ensuring that the piston rod is aligned with the axis of the fixed ring 20, thus achieving centering guidance of the piston rod. The telescoping device 42 can be any one of a cylinder, hydraulic cylinder, electric telescoping rod, or screw drive mechanism.

[0045] Specifically, such as Figure 4-5 As shown in this embodiment of the invention, the fixing unit includes a plurality of fixing members 50 distributed circumferentially along the fixing ring 20 and a driving member 60. The driving member 60 is disposed within the fixing ring 20 and is pulsatorically connected to the plurality of fixing members 50 to drive the plurality of fixing members 50 to move synchronously along the radial direction of the fixing ring 20. By simultaneously pressing and fixing the cylinder body with the plurality of fixing members 50, not only is the stability during piston rod installation guaranteed, but it also enables the installation and fixing of cylinder bodies of different diameter specifications, thus improving its applicability.

[0046] Specifically, such as Figure 4As shown, in this embodiment of the invention, the fixing member 50 includes an adjusting block 51 that slides through the fixing ring 20 and has a toothed groove on one side, and a fixing block 52 located in the through hole and connected to one end of the adjusting block 51; the driving member 60 includes a toothed ring 61 that is rotatably engaged in the fixing ring 20 and a gear 62 that is rotatably disposed in the fixing ring 20, the gear 62 meshing with the toothed ring 61 and the toothed groove respectively. By controlling the rotation of the toothed ring 61, the toothed ring 61 meshes with the toothed groove on each adjusting block 51 through the gear 62, thereby driving the adjusting block 51 to slide in the radial direction of the fixing ring 20, and then driving the fixing block 52 connected to it to move synchronously in the radial direction through the sliding of the adjusting block 51, so that the fixing block 52 presses and fixes the cylinder body, thereby clamping the cylinder body in the fixing ring 20. Furthermore, since multiple fixed blocks 52 move synchronously through the toothed ring 61 and the gear 62, all fixed blocks 52 move simultaneously in the radial direction, which can achieve uniform force on the cylinder and stable positioning, and avoid cylinder eccentricity or movement.

[0047] Meanwhile, to further ensure the stability of the cylinder block fixation, in this embodiment of the invention, the fixing block 52 is arc-shaped. The arc-shaped fixing block 52 better conforms to the shape of the cylinder block, effectively increasing the contact area between the fixing block 52 and the cylinder block, ensuring the stability of the cylinder block fixation. Furthermore, anti-slip pads can be provided on the fixing block 52 to further increase the friction between the fixing block 52 and the cylinder block, thereby ensuring the stability of the cylinder block fixation.

[0048] Specifically, such as Figure 5 As shown, in this embodiment of the invention, the fixing unit further includes an adjusting member 70. The adjusting member 70 includes a worm gear tooth 71 formed on the outer side of the gear ring 61 and a worm 72 meshing with the worm gear tooth 71. The fixing ring 20 is provided with a mounting shell 73, and the worm 72 is rotatably mounted on the mounting shell 73. When it is necessary to clamp the cylinder body, the worm 72 mounted on the mounting shell 73 is rotated, causing the worm 72 to mesh with the worm gear tooth 71, thereby driving the gear ring 61 to rotate. After the gear ring 61 rotates, it meshes with the tooth grooves of each adjusting block 51, causing the adjusting block 51 and its connected fixing block 52 to move synchronously in the radial direction of the fixing ring 20. Since the meshing of the worm 72 and the worm gear has a self-locking characteristic, after the operation stops, the fixing block 52 can maintain a stable position, preventing the cylinder body from shifting due to vibration or external force, thereby ensuring the safety and stability of the cylinder body during installation and maintenance. Furthermore, one end of the worm 72 passes through the mounting shell 73 and is provided with an adjusting part 74. The adjusting part 74 facilitates the rotation of the worm gear 72. The adjusting part 74 can be in the form of a knob, handle, or hexagonal interface.

[0049] Based on the above solutions, such as Figure 1-2 and Figure 6As shown in this embodiment of the invention, the fixed frame 10 is slidably provided with a support plate 80, which supports the cylinder body. A lifting member 90 is also provided between the support plate 80 and the bottom end of the fixed frame 10. The lifting member 90 is used to drive the support plate 80 to move along the height direction of the fixed frame 10. The height of the support plate 80 can be adjusted by the lifting member 90, thereby adjusting the position of the cylinder body on the fixed frame 10, ensuring that the mounting end of the cylinder body is always above the fixing ring 20, facilitating the subsequent insertion and alignment of the piston rod.

[0050] Specifically, the lifting component 90 is a hydraulic jack, with its fixed end located at the bottom end of the fixed frame 10 and its telescopic end located at the bottom end of the support plate 80. By activating the hydraulic jack, its telescopic end gradually extends, thereby lifting the support plate 80. Furthermore, to further improve the stability of the lifting of the support plate 80, two hydraulic jacks are provided, symmetrically distributed at the bottom end of the fixed frame 10. Of course, in another embodiment, the lifting component 90 can also be a threaded adjustment structure or various telescopic structures (hydraulic cylinders, etc.).

[0051] Specifically, such as Figure 1-2 and Figure 6 As shown in this embodiment of the invention, the side of the support plate 80 is provided with a slide 81, and pulleys 82 are rotatably provided on both sides of the slide 81. The fixed frame 10 has a sliding groove 101, and the pulleys 82 are rolledly connected to the sliding groove 101. Through the cooperation of the pulleys 82 and the sliding groove 101, the support plate 80 can slide smoothly when it is raised and lowered along the height direction of the fixed frame 10, avoiding lateral swaying or tilting, thereby ensuring the safety and stability of the cylinder during the raising and lowering process. Of course, in actual use, the height of the support plate 80 can be adjusted first, and then the cylinder can be placed on the support plate 80.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A piston rod centering guide device, characterized in that, include: The mounting bracket (10) has a through hole; A fixing ring (20) is provided on the fixing frame (10) and is collinear with the axis of the through hole. The fixing ring (20) is provided with a fixing unit for fixing the cylinder body. The centering unit includes two opposing centering plates (30) and a drive assembly (40) that drives the two centering plates (30) to move respectively. The two centering plates (30) are respectively located on opposite sides of the fixed ring (20) and move in a direction toward or away from the axis of the fixed ring (20) to guide and center the piston rod entering the fixed ring (20) so that the piston rod is coaxial with the cylinder.

2. The piston rod centering guide device according to claim 1, characterized in that, The centering plate (30) has a V-shaped groove (31) on the side facing the piston rod. Rollers (32) are provided on the two opposite groove walls of the V-shaped groove (31), and the rolling direction of the rollers (32) is consistent with the moving direction of the piston rod.

3. The piston rod centering guide device according to claim 1, characterized in that, The drive assembly (40) includes a mounting bracket (41) located on top of the fixed frame (10) and a telescopic device (42) located on the mounting bracket (41). The centering plate (30) is slidably mounted on the mounting bracket (41) and connected to the telescopic end of the telescopic device (42).

4. The piston rod centering guide device according to claim 1, characterized in that, The fixing unit includes a plurality of fixing members (50) distributed circumferentially along the fixing ring (20) and a driving member (60). The driving member (60) is disposed inside the fixing ring (20) and is connected to the plurality of fixing members (50) in a transmission manner to drive the plurality of fixing members (50) to move synchronously along the radial direction of the fixing ring (20).

5. The piston rod centering guide device according to claim 4, characterized in that, The fixing member (50) includes an adjusting block (51) that slides through the fixing ring (20) and has a toothed groove on one side, and a fixing block (52) located in the through hole and connected to one end of the adjusting block (51); the driving member (60) includes a toothed ring (61) that is rotatably engaged in the fixing ring (20) and a gear (62) that is rotatably disposed in the fixing ring (20), the gear (62) meshing with the toothed ring (61) and the toothed groove respectively.

6. The piston rod centering guide device according to claim 5, characterized in that, The fixing unit also includes an adjusting member (70), which includes a worm gear tooth (71) opened on the outside of the toothed ring (61) and a worm (72) meshing with the worm gear tooth (71). The fixing ring (20) is provided with a mounting shell (73), and the worm (72) is rotatably mounted on the mounting shell (73).

7. The piston rod centering guide device according to claim 6, characterized in that, One end of the worm gear (72) passes through the mounting housing (73) and is provided with an adjustment part (74).

8. The piston rod centering guide device according to any one of claims 1-7, characterized in that, The fixed frame (10) is slidably provided with a support plate (80), which is used to support the cylinder body. A lifting member (90) is also provided between the support plate (80) and the bottom end of the fixed frame (10), which is used to drive the support plate (80) to move along the height direction of the fixed frame (10).

9. The piston rod centering guide device according to claim 8, characterized in that, The side of the support plate (80) is provided with a slide (81), and pulleys (82) are rotatably provided on both sides of the slide (81). The fixed frame (10) is provided with a groove (101), and the pulleys (82) are rotatably connected to the groove (101).

10. The piston rod centering guide device according to claim 8, characterized in that, The lifting component (90) is a hydraulic jack. The fixed end of the hydraulic jack is located at the bottom end of the fixed frame (10), and the telescopic end is located at the bottom end of the bearing plate (80).

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