Chuck positioning engagement mechanism for a spout forming connector

Abstract

The utility model relates to the technical field of pipe orifice processing, specifically be a chuck positioning combination mechanism for pipe orifice forming connecting piece, including by four independent clamp seat spliced out round table shape clamp seat group and set up at its axial both ends rear chuck and front baffle ring. The central hole inner wall of clamp seat is provided with the installation groove that constitutes by rectangle preloading part and right angle trapezoidal clamping part, four grooves form die installation space, rear chuck is connected through its joint groove and the joint lug of clamp seat end to provide axial thrust, and the front baffle ring is fixed to the external frame body, and its inner mesa is matched with the outer mesa of clamp seat group. Through the axial movement of rear chuck is converted into the synchronous, even radial contraction movement of four clamp seats, utilize large area mesa contact to replace traditional multi-tooth joint groove, realized the stable clamping of mould, and the precision requirement of mould and clamp seat group is low.

Description

Technical Field

[0001] This utility model mainly relates to the field of pipe end processing technology, specifically a chuck positioning and connecting mechanism for pipe end forming connectors. Background Technology

[0002] During pipe end processing, a clamping mechanism is typically used to connect and clamp the forming mold, and to push the mold to perform plastic forming operations such as extrusion and flanging on the pipe end. Due to the diversity of processing requirements, the clamping mold needs to be changed frequently.

[0003] To ensure ease of replacement, existing technologies employ a structure with large toothed slots on the inner wall of the fixture to facilitate quick engagement and disengagement with the mold. However, this multi-tooth structure has significant drawbacks: when subjected to the enormous thrust from the rear end, each tooth needs to share a large amount of stress, placing extremely high demands on the machining accuracy of the teeth and the strength of the mold material. In practical use, wear or breakage of any single tooth can lead to simultaneous damage to the entire fixture and the expensive mold, requiring them to be scrapped, resulting in high maintenance costs.

[0004] Therefore, a more durable chuck positioning mechanism with lower precision requirements is needed to clamp the mold. Utility Model Content

[0005] The purpose of this invention is to provide a chuck positioning and connecting mechanism for pipe forming connectors, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a chuck positioning and connecting mechanism for pipe end forming connectors, comprising a clamping seat assembly for clamping the mold, wherein a rear chuck and a front retaining ring are respectively provided at both axial ends of the clamping seat assembly.

[0007] The fixture assembly includes four fixture seats arranged in a circumferential array. Each fixture seat is a quarter-frustum shape with a central opening. When the four fixture seats are combined, the assembly forms a complete frustum structure with a central opening. Each fixture seat has a mounting groove on the inner wall of its central opening, comprising a pre-installation section and a clamping section. The mounting grooves on the four fixture seats together form a complete mold mounting space for pre-installing and ultimately clamping the mold.

[0008] One end of the rear chuck has a locking groove, and one end of any of the fixture seats has a locking protrusion that matches the locking groove. Axial movement of the rear chuck can drive the entire fixture seat assembly to move axially synchronously.

[0009] The front retaining ring is fixedly installed on the outer frame. Its inner wall is shaped as an inner platform that fits the outer platform of the clamp seat assembly. It is used to limit the axial range of motion of the clamp seat assembly and to force it to produce radial contraction or expansion when it moves axially.

[0010] Preferably, the axial cross-section of the pre-assembly part is rectangular, and the axial cross-section of the clamping part is a right trapezoid. During installation, the mold is first pre-positioned within the spacious area formed by the pre-assembly part. Then, under the push of the rear chuck, the mold moves axially together with the fixture assembly and slides along the trapezoidal hypotenuse of the clamping part, and is finally radially clamped.

[0011] Preferably, the clamping base has mounting holes at both circumferential ends. When two adjacent clamping bases are brought together, their corresponding mounting holes communicate with each other, and springs are installed within them. The two ends of each spring are fixed to the inside of a mounting hole. The extension and retraction of the springs drive the entire clamping base assembly to perform radial opening and closing movements.

[0012] Preferably, when the spring is in its natural state, its elastic force causes the four clamping seats to separate from each other, at which point the mold installation space is maximized, facilitating the placement and removal of the mold.

[0013] Preferably, the outer wall of the snap-fit ​​protrusion is recessed inward along the axial direction to form an annular snap-fit. Correspondingly, the inner wall of the snap-fit ​​groove protrudes outward along the axial direction to form an annular protrusion that fits into the annular snap-fit. The four clamp seats are reliably installed and limited within the rear chuck by the engagement of their annular snap-fits with the annular protrusion on the rear chuck, forming a unified unit that can be driven synchronously.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By designing the clamping unit as a split frustum structure composed of four independent clamping units, and utilizing the snap-fit ​​between the rear end of the clamping unit and the rear chuck, and the interaction between the outer platform surface of the clamping unit and the inner platform surface of the front retaining ring, the axial thrust of the rear chuck is converted into a synchronous and uniform radial clamping force of the four clamping units. Furthermore, the large-area platform contact of the inner clamping part bears the working thrust, resulting in uniform stress distribution and avoiding localized cracking caused by stress concentration. This makes the overall load-bearing capacity of the mechanism stronger, its service life longer, and its tolerance for part machining errors higher.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the present invention and other related contents, and should not be considered as limitations on the present invention.

[0017] In the accompanying drawings of the instruction manual:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is an exploded view of each structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the fixture assembly of this utility model in its natural state.

[0021] Figure 4 For the present utility model Figure 3 Schematic diagram of the back side of the structure;

[0022] Figure 5 For the present utility model Figure 3 A schematic diagram of the top structure of the clamp seat in the lower left position;

[0023] Figure label:

[0024] 100. Fixture base assembly; 101. Fixture base; 102. Mounting groove; 103. Spring; 104. Snap-fit ​​protrusion; 105. Annular bayonet; 106. Mounting hole; 107. Pre-assembly part; 108. Clamping part; 200. Rear chuck; 201. Snap-fit ​​groove; 202. Annular protrusion; 300. Front retaining ring; 400. Mold mounting space. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 5 As shown, the chuck positioning and connecting mechanism for pipe forming connectors provided by this utility model mainly consists of three parts: a clamp seat group 100, a rear chuck 200, and a front retaining ring 300.

[0028] The fixture assembly 100 consists of four independent fixture seats 101 arranged in a circular array around a central axis. Each fixture seat 101 is a quarter-truncated cone with a hole at its center and a mounting groove 102 machined into its wall. The mounting groove 102 is divided into two sections: a pre-installation section 107 near the rear end, with a rectangular axial cross-section and ample space for initial mold placement; and a clamping section 108 near the front end, with a right-angled trapezoidal axial cross-section, whose inclined surface guides and ultimately locks the mold. When the four fixture seats 101 are closed, their mounting grooves 102 together form a complete mold mounting space 400.

[0029] Mounting holes 106 are formed on the contact end faces of two adjacent clamp seats 101. When the four clamp seats 101 are engaged, the adjacent mounting holes 106 are connected, and springs 103 are installed in them. The two ends of the springs 103 are detachably mounted to the bottom of the mounting holes 106 on both sides. More specifically, each end of the spring 103 has a connector, which is an elastic plug or a bolt, so as to elastically engage or threadedly connect with the bottom of the mounting holes 106. Both methods are common in the prior art and will not be described in detail. Under the natural elastic force of the springs 103, the four clamp seats 101 tend to move away from each other, so that the clamp seat assembly 100 is in a radially open state (e.g., Figure 3 (As shown).

[0030] The rear chuck 200 is driven by an external drive mechanism (such as a hydraulic cylinder or servo motor) and can move axially. The front end of the rear chuck 200 has an annular engagement groove 201. The rear end of each clamp seat 101 has an engagement protrusion 104 that mates with the engagement groove 201. To achieve a more reliable connection, an annular notch 105 is formed on the outer wall of the engagement protrusion 104, and an annular protrusion 202 matching the annular notch 105 is provided on the inner wall of the engagement groove 201 of the rear chuck 200. Through the engagement of the annular notch 105 and the annular protrusion 202, the four clamp seats 101 are securely assembled on the rear chuck 200, forming a synchronously driven unit.

[0031] The front retaining ring 300 is fixed to the external equipment bracket by bolts, and its inner wall is an inner platform that matches the outer platform of the clamp seat assembly 100.

[0032] The working principle of this product is as follows: In the initial state, the clamping seat assembly 100 is radially opened by the action of the spring 103. The operator inserts the mold into the mold installation space 400 from the left side along the axis, further stretching the spring 103 to open the clamping seat assembly 100 and place it into the spacious mold installation space 400 composed of four pre-installation parts 107. Then the spring 103 automatically returns to its original position, completing the mold pre-installation.

[0033] Then, an external drive mechanism pushes the rear chuck 200 forward axially. The rear chuck 200 drives the entire clamping assembly 100 forward together through the annular notch 105 and the annular protrusion 202. Since the front retaining ring 300 is fixed, its inner platform contacts the outer platform of the advancing clamping assembly 100, forcing the four clamping seats 101 to overcome the elastic force of the spring 103 and synchronously and smoothly retract radially towards the center. During this process, the mold slides from the pre-installation part 107 into the clamping part 108, and is finally held firmly by the four clamping seats 101 through their trapezoidal inclined surfaces, providing strong clamping. During use, the stress distribution is uniform and local cracking is not easy, and the trapezoidal inclined surface of the clamping part 108 allows for a certain degree of accuracy error between the clamping seats 101 and the mold.

[0034] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from its essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A chuck positioning and engaging mechanism for pipe forming connectors, comprising a clamping seat assembly (100) for holding the mold, characterized in that: The clamp seat assembly (100) is provided with a rear chuck (200) and a front retaining ring (300) at its two axial ends respectively. The fixture assembly (100) includes four fixture seats (101) arranged in a circumferential array. Each fixture seat (101) is a quarter-truncated cone with a hole at its center, so that the assembled fixture assembly (100) is a complete truncated cone with a central hole. The inner wall of the central hole of each fixture seat (101) has a mounting groove (102). The mounting groove (102) includes a pre-installation part (107) and a clamping part (108). The four mounting grooves (102) together form a mold installation space (400) for pre-installing and clamping the mold. One end of the rear chuck (200) has a snap-fit ​​groove (201), and one end of any of the fixture seats (101) forms a snap-fit ​​protrusion (104) that matches the snap-fit ​​groove (201). The rear chuck (200) pushes the fixture seat assembly (100) to move axially as a whole. The front retaining ring (300) is fixed on the outer frame, and its inner wall fits with the outer platform of the clamp seat assembly (100) to limit the axial movement range of the clamp seat assembly (100).

2. The chuck positioning and connecting mechanism for a pipe end forming connector according to claim 1, characterized in that: The axial section of the pre-installed part (107) is rectangular, and the axial section of the clamping part (108) is a right trapezoid. When the mold is installed in the mold installation space (400), it is first placed in the pre-installed part (107) and then axially slid and clamped along the trapezoidal hypotenuse of the clamping part (108).

3. The chuck positioning and connecting mechanism for a pipe end forming connector according to claim 1, characterized in that: The clamp seat (101) has mounting holes (106) at both ends of its circumferential direction. The two mounting holes (106) between adjacent clamp seats (101) are connected to each other and are provided with springs (103). The two ends of the springs (103) are respectively installed and fixed inside the mounting holes (106). The springs (103) extend and retract to drive the clamp seat assembly (100) to open and close radially.

4. The chuck positioning and connecting mechanism for a pipe end forming connector according to claim 3, characterized in that: When the spring (103) is in its natural state, the four clamp seats (101) are separated from each other.

5. The chuck positioning and connecting mechanism for a pipe end forming connector according to claim 1, characterized in that: The outer wall of the snap-fit ​​protrusion (104) is recessed inward along the axial direction to form an annular snap-fit ​​opening (105), and the inner wall of the snap-fit ​​groove (201) protrudes outward along the axial direction to form an annular protrusion (202) that fits into the annular snap-fit ​​opening (105). The four clamp seats (101) are installed in the rear chuck (200) with the cooperation of the annular snap-fit ​​opening (105) and the annular protrusion (202).

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