A positioning fixture for CNC machining of furnace head bottom cups

Abstract

This utility model relates to the field of positioning fixture technology and discloses a positioning fixture for CNC machining of stove bottom cups, including a base, a U-shaped clamp, an inner cylinder, and a sleeve. Columns are fixedly connected to the four corners of the upper surface of the base. This positioning fixture for CNC machining of stove bottom cups uses a U-shaped clamp slidingly engaged with a sliding groove and a rotating arm adjusting rod structure. Through a double locking mechanism of fastening bolts one and two, it can achieve multi-angle clamping adaptation and flexibly adjust the spatial position of the positioning chuck by sliding the adjusting rod to meet the clamping requirements of stove bottom cups of different specifications. The sleeve's built-in guide rod and the precise fit with the sliding groove form a longitudinal adjustment reference. Combined with the rapid fine-tuning of the adjusting nut and the spring buffer mechanism, it maintains positioning stability while ensuring adjustment accuracy. The hinge structure between the outer cylinder and the inner rod, combined with fastening bolt three, supports dynamic adjustment of the rotating arm's pitch angle, and is coupled with a vertical power system driven by a hydraulic rod.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixture technology, specifically a positioning fixture for CNC machining of furnace head bottom cups. Background Technology

[0002] In the field of CNC machining of precision metal parts such as furnace head bottom cups, the accuracy and efficiency of clamping and positioning directly affect product yield and production costs.

[0003] Most companies still use manual bolt clamping to fix workpieces, which requires repeated adjustment of the U-shaped clamp position and tightening of bolts one by one. The clamping time for a single piece is long and it is difficult to match the high-efficiency processing rhythm of CNC machine tools. Moreover, long-term operation can easily lead to excessive labor intensity for workers. In addition, most of the existing general-purpose clamps adopt a fixed positioning block structure, which can only be adapted to a single specification of cup. When facing the serial production of furnace head bottom cups with large diameter differences, tooling clamps need to be changed frequently. Conventional clamps use a single locking bolt for fixation. In continuous batch processing, the machine tool vibration can easily cause displacement. Actual measurement data shows that its positioning repeatability is poor and it is difficult to meet the processing requirements of aerospace-grade aluminum alloy cups.

[0004] Therefore, it is necessary to propose a positioning fixture for CNC machining of the furnace head bottom cup. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a positioning fixture for CNC machining of furnace head bottom cups. It has the advantages of being able to quickly switch tooling specifications and adapt to the CNC machining needs of various types of furnace head bottom cups, thus solving the problems mentioned in the background technology.

[0006] This utility model provides the following technical solution: a positioning fixture for CNC machining of a furnace head bottom cup, comprising a base, a U-shaped clamp, an inner cylinder, and a sleeve. Columns are fixedly connected to the four corners of the upper surface of the base, and a CNC table is fixedly connected to the top of each column. Three sliding grooves are formed on the upper surface of the CNC table, arranged circumferentially. The U-shaped clamp is slidably engaged with the edge of one of the sliding grooves. A rotating arm is rotatably connected to one side of the U-shaped clamp, and an adjusting rod is detachably inserted into the top of the rotating arm. A positioning chuck is fixedly connected to one end of the adjusting rod. The inner cylinder is fixedly connected to the lower surface of the CNC table, and a threaded post is slidably inserted into the bottom of the inner cylinder. The sleeve is slidably fitted onto the surface of the threaded post.

[0007] Preferably, the top end of the rotating arm is threaded with a second fastening bolt, and the bottom end of the second fastening bolt is in close contact with the surface of the adjusting rod.

[0008] Preferably, the top of the U-shaped clip is threaded with a fastening bolt, and the bottom end of the fastening bolt is in close contact with the edge surface of the groove.

[0009] Preferably, the sleeve is fixedly connected to three hinge joints on its side. The hinge joints are arranged circumferentially with respect to the surface of the sleeve and correspond to the position of the first sliding groove. An outer cylinder is rotatably connected to the hinge joints. An inner rod is slidably inserted into the top of the outer cylinder. The top of the inner rod is rotatably connected to the bottom of the rotating arm. A fastening bolt three is threadedly connected to the surface of the outer cylinder. The end of the fastening bolt three is tightly fitted to the surface of the inner rod.

[0010] Preferably, the inner cylinder has a second sliding groove on its side wall, a guide rod is fixedly connected to the side of the threaded column, the guide rod is slidably engaged with the second sliding groove, an adjusting nut is rotatably connected to the bottom end of the sleeve, the adjusting nut is threaded onto the surface of the threaded column, a spring is fixedly connected to the top end of the sleeve, a washer is fixedly connected to the top end of the spring, and both the washer and the spring are movably sleeved on the surface of the threaded column.

[0011] Preferably, a hydraulic rod is fixedly connected to the upper surface of the base, and the hydraulic rod is located directly below the threaded column.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This positioning fixture for CNC machining of stove head bottom cups employs a U-shaped clamping piece slidingly engaged with a sliding groove and a rotating arm adjusting rod structure. Through a double locking mechanism using fastening bolts one and two, it achieves multi-angle clamping adaptation and allows for flexible adjustment of the positioning chuck's spatial position via the adjusting rod, meeting the clamping requirements of different stove head bottom cup specifications. The sleeve's built-in guide rod, precisely engaged with sliding groove two, forms a longitudinal adjustment reference. Combined with the rapid fine-tuning of the adjusting nut and a spring buffer mechanism, it maintains positioning stability while ensuring adjustment accuracy. The hinged structure of the outer cylinder and inner rod, along with fastening bolt three, supports dynamic adjustment of the rotating arm's pitch angle. Combined with a hydraulically driven vertical power system, it achieves adaptive positioning during complex curved surface machining. The innovative design of a double guide rod and sliding groove, along with a spring self-resetting mechanism, ensures automatic return to position when no external force is applied to the threaded column, guaranteeing repeatable positioning accuracy during batch processing. This structure replaces manual operation with mechanical linkage, significantly reducing labor intensity and improving processing efficiency. Its modular design allows for rapid switching of tooling specifications, adapting to the CNC machining needs of various stove head bottom cups. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0016] Figure 2 This is a schematic diagram of the rotating arm structure of this utility model;

[0017] Figure 3 This is a cross-sectional view of the inner cylinder structure of this utility model. Detailed Implementation

[0018] 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.

[0019] Reference Figures 1-3 As shown, a positioning fixture for CNC machining of a stove bottom cup includes a base 100, a U-shaped clamp 200, an inner cylinder 300, and a sleeve 400. Columns are fixedly connected to the four corners of the upper surface of the base 100, and a CNC table 101 is fixedly connected to the top of each column. Three sliding grooves 102 are formed on the upper surface of the CNC table 101, arranged in a circular pattern. The U-shaped clamp 200 is slidably engaged with the edge of the sliding groove 102. A rotating arm 202 is rotatably connected to one side of the U-shaped clamp 200. An adjusting rod 203 is detachably inserted into the top of the rotating arm 202. A positioning chuck 204 is fixedly connected to one end of the adjusting rod 203. The inner cylinder 300 is fixedly connected to the lower surface of the CNC table 101. A threaded post 302 is slidably inserted into the bottom of the inner cylinder 300, and the sleeve 400 is slidably sleeved on the surface of the threaded post 302.

[0020] In a further preferred embodiment, the top end of the rotating arm 202 is threadedly connected with a second fastening bolt 205. The bottom end of the second fastening bolt 205 is tightly fitted with the surface of the adjusting rod 203. The adjusting rod 203 can slide at the top end of the rotating arm 202 to adjust the position of the positioning chuck 204, and the second fastening bolt 205 can fix the position of the positioning chuck 204.

[0021] In a further preferred embodiment, the top of the U-shaped clamp 200 is threaded with a fastening bolt 201, and the bottom end of the fastening bolt 201 is tightly fitted with the edge surface of the slide groove 102. The structure of sliding engagement with the slide groove 102 enables multi-angle clamping adaptation, and the combination of the rotating arm 202 and the adjusting rod 203 provides flexible spatial positioning capability, suitable for the clamping needs of different specifications of burner bottom cups.

[0022] More preferably, three hinge joints 404 are fixedly connected to the side of the sleeve 400. The hinge joints 404 are arranged circumferentially with respect to the surface of the sleeve 400 and correspond to the position of the slide groove 102. An outer cylinder 500 is rotatably connected to the hinge joints 404. An inner rod 501 is slidably inserted into the top of the outer cylinder 500. The top of the inner rod 501 is rotatably connected to the bottom of the rotating arm 202. A fastening bolt 3 502 is threadedly connected to the surface of the outer cylinder 500. The end of the fastening bolt 3 502 is tightly fitted to the surface of the inner rod 501. The adjusting nut 401 at the bottom of the sleeve 400 controls the rapid fine adjustment of the position of the sleeve 400 on the surface of the threaded post 302. The hinge structure between the outer cylinder 500 and the inner rod 501 supports the dynamic adjustment of the pitch angle of the rotating arm 202, enhancing the adaptability to complex curved surface processing.

[0023] In a further preferred embodiment, the inner cylinder 300 has a second sliding groove 301 on its side wall, a guide rod 303 is fixedly connected to the side of the threaded column 302, the guide rod 303 is slidably engaged with the second sliding groove 301, an adjusting nut 401 is rotatably connected to the bottom end of the sleeve 400, the adjusting nut 401 is threaded onto the surface of the threaded column 302, a spring 402 is fixedly connected to the top end of the sleeve 400, a washer 403 is fixedly connected to the top end of the spring 402, and both the washer 403 and the spring 402 are movably sleeved on the surface of the threaded column 302. The fastening bolt 201 of the U-shaped clamp 200 and the fastening bolt 205 of the rotating arm 202 form a double locking mechanism to prevent clamping displacement. The fastening bolt 502 of the outer cylinder 500 ensures the position is locked after angle adjustment. The guide rod 303 built into the inner cylinder 300 cooperates with the slide groove 301 to ensure longitudinal adjustment accuracy. When there is no external force on the threaded post 302, the spring 402 pushes the threaded post 302 to the lowest position through the combination of the spring 402 and the washer 403, maintaining positioning stability.

[0024] Preferably, a hydraulic rod 103 is fixedly connected to the upper surface of the base 100. The hydraulic rod 103 is located directly below the threaded column 302. The hydraulic rod 103 integrated in the base 100 provides vertical power support, which drives the threaded column 302 and the sleeve 400 to move up and down. This causes the outer cylinder 500 and the inner rod 501 to push the rotating arm 202 to rotate the positioning chuck 204, thereby controlling the positioning chuck 204 to clamp and position the furnace head bottom cup, reducing the intensity of manual operation and improving the efficiency of batch processing.

[0025] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[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 positioning jig for numerical control machining of a bottom cup of a burner head, comprising a base (100), a U-shaped clamping piece (200), an inner cylinder (300) and a sleeve (400), characterized in that: The base (100) has columns fixedly connected to the four corners of its upper surface, and a CNC table (101) is fixedly connected to the top of each column. The upper surface of the CNC table (101) has three sliding grooves (102) arranged in a circle. The U-shaped clamp (200) is slidably engaged with the edge of the sliding groove (102). A rotating arm (202) is rotatably connected to one side of the U-shaped clamp (200). An adjusting rod (203) is detachably inserted into the top of the rotating arm (202). A positioning chuck (204) is fixedly connected to one end of the adjusting rod (203). The inner cylinder (300) is fixedly connected to the lower surface of the CNC table (101). A threaded column (302) is slidably inserted into the bottom of the inner cylinder (300). The sleeve (400) is slidably sleeved on the surface of the threaded column (302).

2. The positioning jig for numerically controlling machining of a bottom cup of a burner head according to claim 1, characterized in that: The top of the rotating arm (202) is threaded with a second fastening bolt (205), and the bottom end of the second fastening bolt (205) is in close contact with the surface of the adjusting rod (203).

3. The positioning jig for numerically controlling machining of a bottom cup of a burner head according to claim 1, characterized in that: The top of the U-shaped clip (200) is threaded with a fastening bolt (201), and the bottom end of the fastening bolt (201) is in close contact with the edge surface of the groove (102).

4. The positioning jig for numerically controlling machining of a bottom cup of a burner head according to claim 1, characterized in that: Three hinge joints (404) are fixedly connected to the side of the sleeve (400). The hinge joints (404) are arranged in a circle with respect to the surface of the sleeve (400) and correspond to the position of the first slide groove (102). An outer cylinder (500) is rotatably connected to the hinge joint (404). An inner rod (501) is slidably inserted into the top of the outer cylinder (500). The top of the inner rod (501) is rotatably connected to the bottom of the rotating arm (202). A fastening bolt three (502) is threadedly connected to the surface of the outer cylinder (500). The end of the fastening bolt three (502) is tightly fitted to the surface of the inner rod (501).

5. A positioning fixture for CNC machining of a furnace head bottom cup according to claim 1, characterized in that: The inner cylinder (300) has a second sliding groove (301) on its side wall. A guide rod (303) is fixedly connected to the side of the threaded column (302). The guide rod (303) is slidably engaged with the second sliding groove (301). An adjusting nut (401) is rotatably connected to the bottom end of the sleeve (400). The adjusting nut (401) is threaded onto the surface of the threaded column (302). A spring (402) is fixedly connected to the top end of the sleeve (400). A washer (403) is fixedly connected to the top end of the spring (402). Both the washer (403) and the spring (402) are movably sleeved on the surface of the threaded column (302).

6. A positioning fixture for CNC machining of a furnace head bottom cup according to claim 1, characterized in that: A hydraulic rod (103) is fixedly connected to the upper surface of the base (100), and the hydraulic rod (103) is located directly below the threaded column (302).

Images