Rod end knuckle bearing for electric cylinder

Abstract

The utility model discloses a rod end knuckle bearing for an electric cylinder, which comprises the electric cylinder and a threaded mounting seat, a threaded hole is arranged on the end face of a piston rod of the electric cylinder, the outer diameter of the threaded mounting seat is the same as the inner diameter of the threaded hole, the threaded mounting seat is sleeved in the threaded hole in a threaded manner, and an outer convex ring is arranged on the front end face of the threaded mounting seat extending out of the piston rod. An adjusting gasket is arranged between the outer protruding ring and the end face of the piston rod, a through hole is formed in the threaded installation base in the axis direction of the threaded installation base, the rod end of a rod end knuckle bearing is sleeved with the through hole, and the rod head of the rod end knuckle bearing extends out of the threaded installation base. When the installation distance needing to be adjusted cannot be matched with the thread pitch, the rod end knuckle bearing can freely rotate by 360 degrees in the thread installation base, the rod end knuckle bearing is rotated to enable the rod head of the rod end knuckle bearing to be right opposite to a workpiece needing to be connected, operation is flexible and convenient, and work efficiency is high. On the premise that the electric cylinder does not need to be disassembled and assembled and the piston rod does not need to be machined again, the installation distance can be rapidly and accurately adjusted, and the adjusting efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinder connection bearings, in particular to a rod end joint bearing used for an electric cylinder. Background Art

[0002] The electric cylinder is a universal auxiliary drive device, which can be widely used in the industries of electricity, machinery, metallurgy, transportation, mining, petroleum, chemical industry, heavy lifting, transportation, construction, grain and feed processing, etc. It is an electric drive device that converts the rotary motion of the motor into the linear reciprocating motion of the push rod, and can be used as an executive machine in various simple or complex process flows to achieve remote control, centralized control or automatic control; the rod end joint bearing is a joint bearing with a rod end or mounted on the rod end, which belongs to a type of joint bearing. In the application of the electric cylinder, the rod end joint bearing is usually installed at the end or both ends of the output shaft (piston rod 4) of the electric cylinder, such as patent CN207454528U discloses a rod end joint bearing for an electric push rod, and patent CN214888361U discloses a rod end joint bearing connection structure of an electric push rod. The above patents all install the rod end joint bearing at the end of the piston rod of the electric cylinder; however, the existing rod end joint bearings are all connected to the electric cylinder through the external thread of the outer wall of the rod end. On the piston rod of the movable cylinder, such as the above-mentioned two patents, and patents CN213017280U and CN207715535U both disclose a rod end joint bearing, which are all the above-mentioned threaded connection methods; in some fields with high precision requirements, such as the automobile manufacturing field, the aerospace drone field, etc., there are often high precision requirements for electric cylinders, and in these fields, the adjustment of the installation distance of the electric cylinder is generally achieved by rotating the position of the rod end joint bearing on the piston rod. However, when adjusting the rod end joint bearing, in order to ensure that the end face of the rod head of the rod end joint bearing can face the component to be connected, the adjustment distance value is half a pitch or one pitch (that is, it is necessary to ensure that the rod end joint bearing can rotate 180° or 360°). The adjustment distance is too large and cannot meet the high precision requirements. In this case, the piston rod end face of the electric cylinder is often reworked, such as replacing or polishing the end face to achieve the precise control of the installation distance requirements of the electric cylinder, but the workload of disassembling and assembling the electric cylinder is large, time-consuming and labor-intensive, and the adjustment is difficult. Utility Model Content

[0003] The purpose of the utility model is to provide a rod end joint bearing for an electric cylinder, which has the advantages of being able to rotate 360 ​​degrees freely in a threaded mounting seat when the installation distance to be adjusted cannot match the thread pitch. The rod end joint bearing can be rotated so that its rod head faces the workpiece to be connected. The operation is flexible and convenient, and the installation distance can be quickly and accurately adjusted without disassembling the electric cylinder and reprocessing the piston rod. It is convenient and efficient.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a rod end joint bearing for an electric cylinder, comprising an electric cylinder, the end face of the piston rod of the electric cylinder is provided with a threaded hole along its axial direction, and also comprises a threaded mounting seat, the outer diameter of the threaded mounting seat is the same as the inner diameter of the threaded hole, the outer wall of the threaded mounting seat is provided with an external thread and the thread is sleeved in the threaded hole, and the threaded mounting seat is coaxial with the piston rod, the front end face of the threaded mounting seat extending out of the piston rod is provided with an external convex ring, an adjustment gasket is provided between the external convex ring and the end face of the piston rod, the adjustment gasket is sleeved on the outer wall of the threaded mounting seat, the threaded mounting seat is provided with a through hole along its axial direction, the rod end of the rod end joint bearing is sleeved in the through hole, and the rod head of the rod end joint bearing extends out of the threaded mounting seat.

[0005] Furthermore, one end of the rod end away from the rod head extends out of a threaded mounting seat and is located in the threaded hole, and the end sleeve is provided with a clamping structure for clamping and fixing the rod end.

[0006] Furthermore, the snap-fit ​​structure includes a snap ring, which is a two-half structure. When the two halves of the snap ring are snapped together, the outer diameter thereof is the same as the diameter of the threaded hole. An inner convex ring is provided on the inner wall of one end of the snap ring, and a snap groove is provided on the outer wall of one end of the rod end extending out of the threaded mounting seat. When the snap ring is snapped together, the inner convex ring fits into the snap groove.

[0007] Furthermore, the rod end of the rod end joint bearing is rotatably located in the threaded mounting seat.

[0008] Compared with the prior art, the advantages of the utility model are:

[0009] The threaded mounting seat is connected to the piston rod through threads. The threaded connection can withstand large axial tension and shear force, and the threaded connection can easily adjust the depth of the threaded mounting seat inserted into the threaded hole, thereby realizing the adjustment of the installation distance of the rod end joint bearing. When the installation distance to be adjusted cannot match the thread pitch, the rod end joint bearing can be freely rotated 360° in the threaded mounting seat. The rod end joint bearing can be rotated so that its rod head is facing the workpiece to be connected. The operation is flexible and convenient. The installation distance can be quickly and accurately adjusted without disassembling the electric cylinder and reprocessing the piston rod. It is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 for Figure 1 A magnified view of part A;

[0012] Figure 3 A cross-sectional view of the retaining ring.

[0013] In the figure: 1, electric cylinder; 2, threaded hole; 3, threaded mounting seat; 4, piston rod; 5, through hole; 6, rod end joint bearing; 601, rod end; 602, rod head; 7, outer convex ring; 8, adjustment gasket; 9, retaining ring; 10, inner convex ring; 11, retaining groove; 12, positioning column; 13, positioning groove. DETAILED DESCRIPTION

[0014] The utility model will be further described below.

[0015] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0017] See also Figure 1-3

[0018] A rod end joint bearing for an electric cylinder comprises an electric cylinder 1, wherein the end face of the piston rod 4 of the electric cylinder 1 is provided with a threaded hole 2 along its axial direction, and further comprises a threaded mounting seat 3, wherein the outer diameter of the threaded mounting seat 3 is the same as the inner diameter of the threaded hole 2, the outer wall of the threaded mounting seat 3 is provided with an external thread and is threadedly sleeved in the threaded hole 2, and the threaded mounting seat 3 is coaxial with the piston rod 4, the front end face of the threaded mounting seat 3 extending out of the piston rod 4 is provided with an external convex ring 7, an adjustment gasket 8 is provided between the external convex ring 7 and the end face of the piston rod 4, the adjustment gasket 8 is sleeved on the outer wall of the threaded mounting seat 3, the threaded mounting seat 3 is provided with a through hole 5 along its axial direction, the through hole 5 is sleeved with a rod end 601 of a rod end joint bearing 6, the rod head 602 of the rod end joint bearing 6 extends out of the threaded mounting seat 3, and the rod end 601 of the rod end joint bearing 6 is rotatably located in the threaded mounting seat 3.

[0019] The threaded mounting seat 3 is connected to the piston rod 4 by a threaded connection. The threaded connection can withstand large axial tension and shear force, and the threaded connection can easily adjust the depth of the threaded mounting seat 3 inserted into the threaded hole 2, thereby realizing the adjustment of the installation distance of the rod end joint bearing 6. Compared with the prior art, when the installation distance to be adjusted cannot match the thread pitch, the device does not need to disassemble and assemble the electric cylinder 1, and the adjustment is convenient and quick; for example, when the thread pitch on the rod end of the rod end joint bearing in the prior art is 2mm, and the installation distance to be adjusted is 2.5mm, then the rod end joint bearing needs to be rotated 450°, and the rod head of the rod end joint bearing cannot face the workpiece to be connected. At this time, it can only be done by reprocessing the end face of the piston rod and grinding its end face by 0.5mm. However, the above-mentioned processing methods all have the problems of large workload for disassembling and assembling the electric cylinder, time-consuming and labor-intensive, and inconvenient adjustment. When adjusting the installation distance through the threaded mounting seat 3, since the rod end joint bearing 6 is rotatably located in the threaded mounting seat 3, the threaded mounting seat 3 can be directly rotated to move it 2.5 mm and rotated 450°. At this time, the rod end joint bearing 6 can be freely rotated 360° in the threaded mounting seat 3. The rod end joint bearing 6 can be rotated to make its rod head 602 face the workpiece to be connected. The operation is flexible and convenient. The installation distance can be quickly and accurately adjusted without disassembling the electric cylinder 1 and reprocessing the piston rod 4. It is convenient and efficient.

[0020] Providing an adjustment gasket 8 between the threaded mounting seat 3 and the piston rod 4 can ensure the stability and safety of the connection of the threaded mounting seat 3; specifically, the adjustment gasket 8 can protect the surfaces of the threaded mounting seat 3 and the piston rod 4, avoiding scratches or indentations on the surfaces of the piston rod 4 and the outer convex ring 7 during the tightening process of the threaded mounting seat 3. At the same time, the adjustment gasket 8 can use an anti-slip gasket (such as a toothed gasket) to increase the friction of the contact surface and prevent the threaded mounting seat 3 from rotating or loosening during use; at the same time, in the process of adjusting the installation distance, an adjustment gasket 8 of appropriate thickness can also be selected to compensate for the tolerance and improve the accuracy of the installation distance adjustment.

[0021] Specifically, in this embodiment, one end of the rod end 601 away from the rod head 602 extends out of the threaded mounting seat 3 and is located in the threaded hole 2, and the end sleeve is provided with a clamping structure for clamping and fixing the rod end 601. The snap-fitting structure includes a snap ring 9, which is a two-half structure (that is, the snap ring 9 is formed by buckling two semicircular rods). When the two halves of the snap ring 9 are buckled, their outer diameter is the same as the inner thread minor diameter of the threaded hole 2, that is, the snap ring 9 can be inserted into the threaded hole 2 after being buckled. The inner wall of one end of the snap ring 9 is provided with an inner convex ring 10, and the outer wall of one end of the rod end 601 extending out of the threaded mounting seat 3 is provided with a snap groove 11. When the snap ring 9 is buckled, the inner convex ring 10 is fitted into the snap groove 11, and the left and right end faces of the inner convex ring 10 are tightly fitted with the left and right end faces of the snap groove 11 respectively, and at the same time, the end face of the snap ring 9 is fitted with the end face of the threaded mounting seat 3, so that the movement of the rod end joint bearing 6 in the axial direction can be limited, thereby ensuring the accuracy of the rod end joint bearing 6 in the axial direction.

[0022] In another embodiment, in order to facilitate the quick and accurate buckling of the two-half structure of the snap ring 9 (that is, the accurate buckling of the two semicircular rods), a positioning assembly is provided on the snap ring 9, and the positioning assembly includes a positioning column 12. The positioning column 12 is arranged on the two buckling end faces of one of the semicircular rods, and the two buckling end faces of the other semicircular rod are provided with one-to-one corresponding positioning grooves 13. The mutually matched positioning columns 12 and positioning grooves 13 can ensure the coaxiality of the two semicircular rods after buckling, ensure that the snap ring 9 is coaxial with the threaded mounting seat 3, and improve accuracy.

[0023] Specific examples are used in this article to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method of the utility model and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. Changes and improvements to the utility model will be possible without exceeding the concept and scope specified in the attached claims. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A rod end joint bearing for an electric cylinder, comprising an electric cylinder (1), wherein the end surface of a piston rod (4) of the electric cylinder (1) is provided with a threaded hole (2) along the axial direction thereof, and characterized in that: The invention also comprises a threaded mounting seat (3), wherein the outer diameter of the threaded mounting seat (3) is the same as the inner diameter of the threaded hole (2), the outer wall of the threaded mounting seat (3) is provided with an external thread and the thread is sleeved in the threaded hole (2), and the threaded mounting seat (3) is coaxial with the piston rod (4), the front end surface of the threaded mounting seat (3) extending out of the piston rod (4) is provided with an external convex ring (7), an adjustment gasket (8) is provided between the external convex ring (7) and the end surface of the piston rod (4), and the adjustment gasket (8) is sleeved on the outer wall of the threaded mounting seat (3), the threaded mounting seat (3) is provided with a through hole (5) along its axial direction, the through hole (5) is sleeved with the rod end (601) of the rod end joint bearing (6), and the rod head (602) of the rod end joint bearing (6) extends out of the threaded mounting seat (3).

2. The rod end joint bearing for an electric cylinder according to claim 1, characterized in that: One end of the rod end (601) away from the rod head (602) extends out of a threaded mounting seat (3) and is located in the threaded hole (2), and the end sleeve is provided with a clamping structure for clamping and fixing the rod end (601).

3. The rod end joint bearing for an electric cylinder according to claim 2, characterized in that: The snap-fit ​​structure comprises a snap ring (9), wherein the snap ring (9) is a two-half structure. When the two halves of the snap ring (9) are snapped together, their outer diameter is the same as the diameter of the threaded hole (2). An inner convex ring (10) is provided on the inner wall of one end of the snap ring (9), and a snap groove (11) is provided on the outer wall of one end of the rod end (601) extending out of the threaded mounting seat (3). When the snap ring (9) is snapped together, the inner convex ring (10) fits into the snap groove (11).

4. The rod end joint bearing for an electric cylinder according to claim 3, characterized in that: The rod end (601) of the rod end joint bearing (6) is rotatably located in the threaded mounting seat (3).

Images