Multistage oil cylinder body outer circle chamfer and drilling positioning tool

Abstract

The utility model provides a kind of multi-stage oil cylinder cylinder body outer circle chamfer and drilling positioning tool, including clamping shaft, the clamping shaft includes central shaft section, and the end of central shaft section is provided with outer shaft section, and the outer diameter of outer shaft section is less than the inner diameter of workpiece, and trapezoidal chucking mouth, positioning mouth and positioning hole are provided on outer shaft section, chucking assembly is provided in chucking mouth, and chucking assembly includes inner support ring, clamping pad, clamping rod and positioning bolt, clamping pad is provided in the clamping pad slot of inner support ring, clamping rod includes stem body, and the top of stem body is provided with the taper head cooperation with the taper hole on inner support ring and the support expansion mouth on clamping pad, and connecting head is provided in the middle position of stem body, and at least two connecting holes are provided on connecting head, and connecting hole is connected by positioning bolt with positioning hole.The utility model design is reasonable, can be multi-angle clamped to cylinder body and be favorable to realize chamfering and drilling operation in lathe station, be favorable to save artificial cost and equipment cost, be suitable for large-scale popularization.

Description

Technical Field

[0001] This utility model belongs to the field of tooling for machining hydraulic cylinder components, and particularly relates to a tooling for chamfering and drilling positioning of the outer circle of a multi-stage hydraulic cylinder. Background Technology

[0002] A multistage hydraulic cylinder is a retractable hydraulic actuator. Its core feature is the use of multiple nested cylinder sections to achieve long-stroke output, primarily used in engineering hydraulic machinery. A multistage hydraulic cylinder mainly consists of an outer cylinder, multiple telescopic cylinder sections, and a piston rod, typically with 2-4 sections. Generally, multistage hydraulic cylinders use a fixed cylinder inlet / outlet method, meaning the inlet and outlet ports are located at the bottom of the outer cylinder.

[0003] Due to the large volume of the cylinder body of multi-stage hydraulic cylinders used in engineering, they are generally manufactured in separate parts, and then assembled or welded into a finished product. For the oil inlet and outlet positions on the cylinder body of a multi-stage hydraulic cylinder, the raw state consists of a steel ring and two steel columns. The steel columns are welded to the steel ring, and a preliminary component is formed by drilling holes in the steel columns and chamfering the outer circle of the steel ring. During the chamfering step, it needs to be clamped on a lathe and chamfered by turning. If oil inlet and outlet holes are to be drilled on the steel columns, the process is done on a drilling machine. Because of the large size of the workpiece, transferring it between processes requires the use of a trolley and involves numerous loading and unloading operations, which is detrimental to improving processing efficiency. Furthermore, if the workstations are combined, the fixtures required for changing the machining surface of the workpiece may not match, which is detrimental to ensuring machining quality. Utility Model Content

[0004] This utility model addresses the technical problems existing in the machining process of multi-stage hydraulic cylinders by proposing a rationally designed multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture that can clamp the cylinder body at multiple angles and facilitates chamfering and drilling operations at the lathe station.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture provided by this utility model includes a clamping shaft, the clamping shaft including a central shaft section, the end of the central shaft section being provided with an outer shaft section, the outer diameter of the outer shaft section being smaller than the inner diameter of the workpiece, the outer shaft section being provided with a trapezoidal clamping opening, the clamping opening having a positioning opening on one side near the central shaft section, the plane of the clamping opening being provided with multiple positioning holes distributed along its length direction, the clamping opening being provided with a clamping assembly, the clamping assembly including an inner support ring, the outer circumference of the inner support ring being provided with two spaced-apart annular... The inner support ring has at least one tapered hole in the retaining groove. The larger end of the tapered hole faces away from the center of the inner support ring. The diameter of the larger end of the tapered hole is greater than the minimum axial distance between the two retaining grooves. A clamping pad is provided in the retaining groove. The clamping pad has a flared opening at a position corresponding to the tapered hole. A clamping rod is provided on the inner side of the inner support ring and is threaded to the positioning hole. The clamping rod includes a rod body. The top of the rod body has a tapered head that mates with the tapered hole and the flared opening. A connector is provided in the middle of the rod body. The connector has at least two connecting holes. The connecting holes and the positioning hole are used to connect through a positioning bolt.

[0006] Preferably, the expansion joint includes a tapered section and a rectangular section, wherein the tapered section is distributed close to the tapered hole and its minimum diameter is smaller than the top diameter of the cone.

[0007] Preferably, the outer wall of the clamping pad is provided with a plurality of anti-slip teeth distributed at intervals along its circumference, and the maximum diameter of the clamping pad in its natural state is 1-3 mm larger than the outer diameter of the inner support ring.

[0008] Preferably, the center of the positioning port is provided with a tip concentric with the central axis segment.

[0009] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture. A single fixture can position the workpiece in different postures, facilitating its clamping on a lathe. Chamfering and drilling operations can be performed on the lathe, saving labor and equipment costs. This utility model is rationally designed, capable of multi-angle clamping of the cylinder body, and facilitates chamfering and drilling operations on a lathe, making it suitable for large-scale application. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A perspective view of the multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture provided in the embodiment for machining the outer circle chamfer of the workpiece; Figure 2 The multi-stage cylinder outer circle chamfering and drilling positioning fixture provided in the embodiment is used for machining the outer circle chamfer of the workpiece; Figure 3 A cross-sectional view along the EE direction of the multi-stage cylinder outer circle chamfer and drilling positioning fixture provided in the embodiment; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 A schematic diagram of the structure of the multi-stage hydraulic cylinder outer circle chamfer and drilling positioning fixture provided in the embodiment; Figure 6 A perspective view of the multi-stage hydraulic cylinder outer circle chamfer and drilling positioning fixture provided in the embodiment for drilling workpieces; Figure 7 for Figure 6 Enlarged view of point B in the middle; In the above figures: 1. Clamping shaft; 11. Central shaft section; 12. Outer shaft section; 13. Clamping opening; 14. Positioning opening; 15. Positioning hole; 16. Center; 2. Clamping assembly; 21. Inner support ring; 211. Swap groove; 212. Tapered hole; 22. Clamping pad; 221. Support flare; 221a. Tapered section; 221b. Rectangular section; 222. Anti-slip tooth protrusion; 23. Clamping rod; 231. Rod body; 232. Conical head; 233. Connector; 234. Connecting hole; 24. Positioning bolt; 3. Workpiece. Detailed Implementation

[0012] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0013] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0014] Examples, such as Figures 1-7 As shown, the multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture provided by this utility model includes a clamping shaft 1, which includes a central shaft section 11. An outer shaft section 12 is provided at the end of the central shaft section 11. The outer diameter of the outer shaft section 12 is smaller than the inner diameter of the workpiece 3. A trapezoidal clamping opening 13 is provided on the outer shaft section 12. A positioning opening 14 is provided on the side of the clamping opening 13 near the central shaft section 11. Multiple positioning holes 15 distributed along the length direction are provided on the plane of the clamping opening 13. A clamping assembly 2 is provided in the clamping opening 13. The clamping assembly 2 includes an inner support ring 21. Two annular retaining grooves 211 are provided on the outer circular surface of the inner support ring 21. At least one conical hole 21 is provided on the inner support ring 21. 2. The large bottom end of the tapered hole 212 faces away from the center of the inner support ring 21. The diameter of the large bottom end of the tapered hole 212 is greater than the minimum axial distance between the two retaining grooves 211. A retaining pad 22 is provided in the retaining groove 211. A support flare 221 is provided at the position corresponding to the tapered hole 212. A retaining rod 23 is provided on the inner side of the inner support ring 21, which is threaded to the positioning hole 15. The retaining rod 23 includes a rod body 231. A cone head 232 that mates with the tapered hole 212 and the support flare 221 is provided at the top of the rod body 231. A connector 233 is provided in the middle of the rod body 231. At least two connecting holes 234 are provided on the connector 233. The connecting holes 234 and the positioning hole 15 are used to connect through the positioning bolt 24.

[0015] Specifically, the central shaft section 11 of the clamping shaft 1 is used to connect with the lathe spindle chuck, and the clamping shaft 1 is coaxial with the output end of the machine tool spindle; the outer shaft section 12 is used to position the workpiece 3, and with the assistance of the clamping assembly 2, it can meet the different processing requirements of the workpiece 3. More specifically, the inner support ring 21 is nested inside the workpiece 3, and the inner wall of the inner support ring 21 mates with the circumferential surface of the outer shaft section 12. With the cooperation of the inner support ring 21 and the outer shaft section 12, the workpiece 3 is aligned with the lathe spindle. After inserting a wrench into the connecting hole 234, the clamping rod 23 is rotated. The conical head 232 of the clamping rod 23 moves from contacting the conical hole 212 to opening the flared end 221, and the real-time diameter of the clamping pad 22 changes until the workpiece 3 is fully clamped. The lathe spindle is started, and the tool can be fed from the side to achieve the purpose of machining the outer chamfer of the cylinder body.

[0016] To machine the oil inlet and outlet holes on the cylinder body, a drill bit is mounted on the tailstock of the lathe. The inner support ring 21, clamping rod 23, and workpiece 3 are placed horizontally in the clamping port 13. The real-time height of the inner support ring 21 inside the workpiece 3 is adjusted. The clamping rod 23 is used to open the clamping pad 22 in the same way to ensure that the workpiece 3 is clamped. The steel column with the unmachined hole on the cylinder body is stuck in the positioning port 14. Another steel column on the cylinder body is aligned with the drill bit on the tailstock. Two positioning bolts 24 are connected from two connecting holes 234 to different positioning holes 15 to ensure the reliability of clamping the workpiece 3. The lathe spindle is started, and the tailstock is used as the tool holder for cutting, which can achieve the function of drilling. Furthermore, since the steel column and the steel ring of the workpiece 3 are welded, cutting from the side can turn the welded surface of the steel column and the steel ring to improve the appearance quality of the cylinder body and reduce the amount of subsequent grinding work. It should be noted that, in order to ensure sufficient drilling, the drilling depth is controlled by controlling the forward and backward movement of the drill bit, and a blind hole can be reserved on the inner support ring 21 to allow for a certain amount of drilling allowance for the drill bit.

[0017] Therefore, this utility model can position the workpiece 3 in different postures by using a set of tooling, which makes it easy to clamp it onto the lathe. The workpiece 3 can be chamfered and drilled at the lathe station, which helps to save labor and equipment costs.

[0018] To improve the clamping performance of the clamping pad 22 on the workpiece 3, this invention uses clamping pads 22 in pairs to ensure uniform distribution of clamping force. Furthermore, the expansion opening 221 is rationally designed, comprising a tapered section 221a and a rectangular section 221b. The tapered section 221a is distributed close to the tapered hole 212, and its minimum diameter is smaller than the top diameter of the cone head 232. The rectangular opening provides the clamping pad 22 with expansion allowance, while the tapered section 221a can engage with the top of the cone head 232 of the clamping rod 23. The taper of the tapered section 221a is smaller than the taper of the cone head 232. Thus, the greater the center distance between the cone head 232 and the inner support ring 21, the greater the expansion pressure exerted by the cone head 232 on the clamping pad 22, until the workpiece 3 and the inner support ring 21 have no free movement, thereby achieving clamping and improving machining quality.

[0019] Furthermore, the outer wall of the clamping pad 22 provided by this utility model is provided with a plurality of anti-slip tooth protrusions 222 distributed at intervals along its circumference. The maximum diameter of the clamping pad 22 in its natural state is 1-3 mm larger than the outer diameter of the inner support ring 21. The outer diameter of the clamping pad 22 and the inner surface of the workpiece 3 have static friction after nesting. After the cone head 232 applies pressure to the support flare 221, the anti-slip tooth protrusions 222 can be clamped to the inner wall of the workpiece 3. The anti-slip tooth protrusions 222 contact the inner wall of the workpiece 3 in a unit manner. The small deformation of the clamping pad 22 within its circumference range can better contact the inner wall of the workpiece 3 and has a better pressure loading effect, which is beneficial to improving the clamping reliability of the workpiece 3.

[0020] To ensure the alignment quality of the oil inlet and outlet ports on the cylinder block, this utility model provides a center point 16 concentric with the central shaft section 11 at the center of the positioning port 14. When drilling is completed at one end, after changing the direction of the workpiece 3, the center point 16 can be placed in the oil hole to provide an alignment reference for machining the other oil hole, thereby ensuring that the drilling result of the cylinder block meets the machining requirements.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture, including a clamping shaft, wherein the clamping shaft includes a central shaft section, characterized in that, The central shaft section has an outer shaft section at its end. The outer diameter of the outer shaft section is smaller than the inner diameter of the workpiece. A trapezoidal clamping opening is provided on the outer shaft section. A positioning opening is provided on the side of the clamping opening near the central shaft section. Multiple positioning holes distributed along the length of the clamping opening are provided on its plane. A clamping assembly is provided in the clamping opening. The clamping assembly includes an inner support ring. Two spaced-apart annular retaining grooves are provided on the outer circumference of the inner support ring. At least one conical hole is provided on the inner support ring. The large bottom end of the conical hole is back... At the center of the inner support ring, the diameter of the large bottom end of the conical hole is greater than the minimum axial distance between the two retaining grooves. A clamping pad is provided in the retaining groove. The clamping pad has a flared opening at the position corresponding to the conical hole. A clamping rod is provided on the inner side of the inner support ring and is threadedly connected to the positioning hole. The clamping rod includes a rod body. The top of the rod body is provided with a conical head that mates with the conical hole and the flared opening. A connector is provided in the middle of the rod body. The connector has at least two connecting holes. The connecting holes are connected to the positioning hole by positioning bolts.

2. The multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture according to claim 1, characterized in that, The flared opening includes a tapered section and a rectangular section, wherein the tapered section is distributed close to the tapered hole and its minimum diameter is smaller than the top diameter of the cone.

3. The multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture according to claim 2, characterized in that, The outer wall of the clamping pad is provided with a plurality of anti-slip teeth distributed at intervals along its circumference, and the maximum diameter of the clamping pad in its natural state is 1-3 mm larger than the outer diameter of the inner support ring.

4. The multi-stage hydraulic cylinder outer circle chamfering and drilling positioning fixture according to claim 3, characterized in that, The center of the positioning port is provided with a tip concentric with the central axis segment.

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