A clamping mechanism for valve blank

Abstract

The utility model discloses a kind of clamping mechanisms for valve blank, including two bases of symmetrical arrangement, two bases are configured to can relatively far away or relatively close, the opposite side of two bases is all installed with elastic clamping piece, two the elastic clamping piece is opposite each other and bends to center, it is formed to a clamping space in common, the clamping space is configured as clamping valve garlic head, to be clamped and fixed by the elastic deformation force of the elastic clamping piece the valve garlic head.Solve the problem of unstable clamping and inaccurate positioning caused by the volume change of valve garlic head due to the fact that traditional clamping structure cannot be adapted.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a clamping mechanism for valve blanks. Background Technology

[0002] The function of a valve is specifically to introduce air into the engine and expel exhaust gases after combustion. A valve consists of a valve head and a stem. Valve head shapes include flat tops, spherical tops, and flared tops.

[0003] In traditional valve manufacturing, the valve stem end undergoes two key processes: resistance heating and forging. In the resistance heating process, existing clamping devices generally employ rigid clamping arms, which have significant drawbacks: First, rigid clamping arms cannot adapt to the volume changes of the valve stem during free forging, leading to unstable clamping force; second, traditional clamping arms lack effective guiding constraints, making the valve stem prone to vertical deflection and torsion during processing; third, the limited contact area of ​​ordinary clamping structures with the valve stem makes it difficult to ensure stable positioning accuracy. These problems not only affect the forming quality of the valve stem but may also lead to cumulative errors in subsequent processing steps. Especially under high-temperature heating environments, the thermal expansion effect of the material further exacerbates the clamping instability, potentially even causing product scrap. Furthermore, most existing clamping mechanisms use an integral design, requiring replacement of the entire unit when the clamping components wear out, increasing operating costs. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a clamping mechanism for valve blanks, which solves the problems of unstable clamping and inaccurate positioning caused by the inability of traditional clamping structures to adapt to changes in the volume of valve bulbs.

[0005] This utility model is achieved using the following technical solution:

[0006] A clamping mechanism for a valve blank includes two symmetrically arranged bases configured to be relatively far apart or relatively close together. Each base has an elastic clamping member mounted on its opposite side. The two elastic clamping members are opposite to each other and bent toward the center to form a clamping space. The clamping space is configured to clamp the valve stem to hold and fix the valve stem by the elastic deformation force of the elastic clamping members.

[0007] Furthermore, the elastic clamping member includes a fixing part and two clamping parts, the two clamping parts being respectively connected to both ends of the fixing part and extending upward relative to the fixing part; wherein, the two clamping parts are symmetrically arranged with respect to the vertical central axis, the ends of the two clamping parts extend towards each other and elastically contact the outer peripheral surface of the valve bulb to form an elastic clamping of the valve bulb.

[0008] Furthermore, the fixing part is a flat sheet structure, and the clamping part is an arc-shaped sheet structure protruding towards the vertical central axis.

[0009] Furthermore, the inner surface of the clamping part has an arcuate surface that matches the outer periphery shape of the valve bulb.

[0010] Furthermore, the elastic clamping member is integrally stamped and bent from a metal sheet.

[0011] Furthermore, the fixing part is mounted on the base by fasteners.

[0012] Furthermore, a clamping space is formed between the clamping portions of the two elastic clamping members, and in the natural state, the minimum distance between the clamping spaces is less than the diameter of the valve bulb.

[0013] Furthermore, the elastic clamping element is a spring sheet.

[0014] Furthermore, the base is provided with a receiving groove, the receiving groove including a pair of opposing guide walls, the guide walls being configured to cooperate with the clamping portion of the elastic clamping member to limit the displacement of the elastic clamping member in a direction perpendicular to its elastic deformation.

[0015] Furthermore, the guide wall is a guide slope that extends obliquely from the surface of the base toward the bottom of the receiving groove, and the elastic clamping member has an inclined surface that cooperates with the guide slope.

[0016] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0017] This invention's clamping mechanism, through the adjustable spacing of two symmetrically arranged bases, allows it to adapt to the volume changes of the valve stem during free forging. The elastic clamping members mounted on the opposing surfaces of the bases are configured to bend towards the center, forming a clamping space. They actively adapt to the shape of the valve stem using elastic deformation force, thus providing dynamic contact pressure during clamping. The bending shape of the elastic clamping members generates a uniformly distributed elastic force when in contact with the valve stem, avoiding the loosening caused by shape mismatch in traditional rigid clamping arms, and suppressing the tilting and torsion of the valve stem in the vertical direction through elastic constraint. The centrally symmetrical design of the clamping space further ensures the centering of the valve stem during clamping, guaranteeing the positioning accuracy of subsequent processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the clamping mechanism according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the elastic clamping member clamping the valve bulb according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the base according to an embodiment of the present utility model;

[0021] In the figure: 1. Base; 11. Receiving groove; 12. Guide wall; 2. Elastic clamping component; 21. Fixing part; 22. Clamping part; 221. Arc-shaped surface; 222. Inclined surface; 3. Valve bulb. Detailed Implementation

[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0023] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0024] like Figures 1 to 3As shown, this utility model provides a clamping mechanism for valve blanks, including two symmetrically arranged bases 1. The two bases 1 are configured to be relatively far apart or relatively close together. Each of the two bases 1 has an elastic clamping member 2 installed on its opposite side. The two elastic clamping members 2 are opposite to each other and bend towards the center to form a clamping space. The clamping space is configured to clamp the valve bulb 3 so as to clamp and fix the valve bulb 3 by the elastic deformation force of the elastic clamping members 2.

[0025] In this embodiment, the valve bulb 3 is a forged blank before the valve blank is stamped. The clamping mechanism, through the adjustable spacing design of two symmetrically arranged bases 1, allows the clamping mechanism to adapt to the volume changes of the valve bulb 3 during free forging. The elastic clamping members 2 installed on the opposite surfaces of the bases 1 adopt a configuration that is opposite to each other and bent towards the center, forming a clamping space. They actively adapt to the shape of the valve bulb 3 by utilizing elastic deformation force, thereby providing dynamic contact pressure during clamping. When the bending shape of the elastic clamping member 2 contacts the valve bulb 3, it generates a uniformly distributed elastic force, which not only avoids the clamping loosening caused by the shape mismatch of traditional rigid clamping arms, but also suppresses the tilting and torsion of the valve bulb 3 in the vertical direction through elastic constraint. The central symmetry design of the clamping space further ensures the centering of the valve bulb 3 during clamping, ensuring the positioning accuracy of subsequent processing.

[0026] It should be noted that the two bases 1 can be moved relatively far apart or relatively close together by a drive source such as a cylinder or a hydraulic cylinder.

[0027] In a preferred embodiment, the elastic clamping member 2 includes a fixing part 21 and two clamping parts 22. The two clamping parts 22 are respectively connected to the two ends of the fixing part 21 and extend upward relative to the fixing part 21. The two clamping parts 22 are symmetrically arranged with respect to a central axis, and the ends of the two clamping parts 22 extend towards each other and elastically contact the outer peripheral surface of the valve bulb 3 to form an elastic clamping of the valve bulb 3.

[0028] In this embodiment, the fixing part 21 forms a rigid connection with the base 1, and the two clamping parts 22 bend upward to form a symmetrical elastic structure. Utilizing the elastic contact method where the ends of the clamping parts 22 extend towards each other, the valve bulb 3 can still obtain a uniform radial clamping force when heated and expanding. The fixing part 21 serves as the central hub for transmitting the clamping force, ensuring a stable force transmission path between the clamping parts 22 and the base 1. The upward bending of the clamping parts 22 forms an elastic deformation space, and the opposite extension of their ends forms an adaptive clamping contact surface. This symmetrical arrangement eliminates the deflection torque caused by unilateral force. The elastic contact surface automatically adjusts the contact pressure according to the volume change of the valve bulb 3, ensuring clamping stability while avoiding structural damage caused by rigid clamping.

[0029] In a preferred embodiment, the fixing part 21 is a flat sheet structure, and the clamping part 22 is an arc-shaped sheet structure protruding towards the central axis.

[0030] In this embodiment, the flat, sheet-like fixing part 21 can form a rigid connection with the base 1, ensuring that the clamping mechanism as a whole will not deform or shift under force, providing a stable support foundation for the clamping action. The arc-shaped, sheet-like clamping part 22, protruding towards the vertical central axis, forms a progressive contact surface through its geometric characteristics, which can adapt to the shape changes of the valve bulb 3 during the clamping process: when the valve bulb 3 expands in volume due to heating, the curvature change of the arc-shaped structure can produce a uniformly distributed elastic deformation, which not only ensures the continuous application of clamping force, but also transforms the line contact between the arc surface and the valve bulb 3 into surface contact, effectively suppressing the tilting tendency of the valve bulb 3 in the vertical plane. The combined structure of the flat fixing part 21 and the arc-shaped clamping part 22 also optimizes the mechanical performance. The former bears the main structural load, while the latter focuses on the elastic clamping function. The two work together through integral molding, which improves the dynamic adaptability to the deformation of the valve bulb 3 while ensuring clamping rigidity.

[0031] In a preferred embodiment, the inner surface of the clamping part 22 is an arc-shaped curved surface 221 that is adapted to the outer peripheral shape of the valve bulb 3.

[0032] In this embodiment, by providing an arc-shaped curved surface 221 on the inner surface of the clamping part 22 that matches the outer peripheral shape of the valve stem 3, the contact surfaces of the clamping part 22 and the valve stem 3 form a geometrically complementary relationship. This arc-shaped curved surface 221 increases the contact area between the clamping part 22 and the valve stem 3, allowing the clamping force to be evenly distributed across the circumferential surface of the valve stem 3, avoiding localized stress concentration. Simultaneously, the shape of the arc-shaped curved surface 221 can adapt to the volume expansion deformation of the valve stem 3 during free forging, maintaining clamping stability through the continuous guiding effect of the arc surface contact. This curved surface adaptation design effectively solves the problem of poor contact between traditional planar clamping surfaces and irregularly shaped workpieces, and is particularly suitable for clamping valve stems 3 with non-planar structures such as spherical or flared tops.

[0033] In a preferred embodiment, the elastic clamping member 2 is integrally stamped and bent from a metal sheet. By employing an integral stamping and bending process, the elastic clamping member 2 achieves overall structural strength and consistency. The choice of metal sheet ensures that the clamping member possesses sufficient elastic deformation capacity and rigidity, providing a stable and durable elastic clamping force when clamping the valve stem 3. The integral stamping process avoids structural weaknesses caused by welding or assembly, ensuring the shape accuracy and uniformity of the mechanical properties of the elastic clamping member 2, thereby improving clamping stability. The stamping and bending process directly forms a continuous structure between the fixing part 21 and the clamping part 22, allowing the end of the clamping part 22 to precisely match the outer circumferential shape of the valve stem 3, reducing uneven clamping gaps caused by manufacturing errors, and further preventing displacement or torsion of the valve stem 3 in the vertical direction.

[0034] In a preferred embodiment, the fixing part 21 is mounted on the base 1 by fasteners.

[0035] In this embodiment, the fixing part 21 of the elastic clamping member 2 is rigidly connected to the base 1 using fasteners, which enhances the overall structural stability of the clamping mechanism. The fixing part 21 serves as the connection between the elastic clamping member 2 and the base 1. The fasteners enable detachable fixing, ensuring that there is no relative displacement between the fixing part 21 and the base 1 during elastic deformation of the clamping part 22, and facilitating future maintenance and replacement. The tightening force of the fasteners precisely controls the friction between the contact surfaces of the fixing part 21 and the base 1, preventing loosening due to clamping vibration or external impact, thus ensuring that the clamping force of the clamping part 22 on the valve stem 3 remains within the design range.

[0036] In a preferred embodiment, a clamping space is formed between the clamping portions 22 of the two elastic clamping members 2, and in the natural state, the minimum distance between the clamping spaces is less than the diameter of the valve bulb 3.

[0037] This embodiment limits the minimum spacing of the clamping space formed by the clamping portion 22 of the elastic clamping member 2 in its natural state to be less than the diameter of the valve stem 3. This ensures that when the valve stem 3 is placed into the clamping space, it must overcome the elastic deformation force of the elastic clamping member 2 to enter. This design ensures that the clamping portion 22 always applies a preload force to the valve stem 3, utilizing the elastic recovery characteristics of the elastic clamping member 2 to create an adaptive clamping effect. Specifically, the construction that the minimum spacing of the clamping space is less than the diameter of the valve stem 3 forces the elastic clamping member 2 to undergo outward elastic deformation during clamping. The reverse force generated by this deformation effectively eliminates the assembly gap between the valve stem 3 and the clamping portion 22, thereby simultaneously forming constraints in the vertical and circumferential directions. This prevents the valve stem 3 from tilting, twisting, or shifting during heating or processing, ensuring precise positioning.

[0038] In a preferred embodiment, the elastic clamping member 2 is a spring sheet. The material properties of the spring sheet enable it to generate sufficient clamping force to fix the valve stem 3, and also allow it to adapt to deformation when the valve stem 3 expands due to heat, avoiding local stress concentration or clamping failure caused by rigid clamping. The high fatigue strength of the spring sheet ensures the stability of the clamping force during long-term repeated use, while its structural uniformity helps to eliminate asymmetrical forces on the valve stem 3 during clamping, thereby suppressing tilting and torsion in the vertical direction.

[0039] In a preferred embodiment, the base 1 is provided with a receiving groove 11, the receiving groove 11 including a pair of oppositely arranged guide walls 12, the guide walls 12 being configured to cooperate with the clamping portion 22 of the elastic clamping member 2 to limit the displacement of the elastic clamping member 2 in a direction perpendicular to its elastic deformation.

[0040] This embodiment achieves precise constraint on the displacement of the elastic clamping member 2 by providing a receiving groove 11 with guide walls 12 on the base 1. The receiving groove 11 is designed with a pair of opposing guide walls 12, which engage with the clamping portion (clamping part 22) of the elastic clamping member 2. This engagement effectively restricts the displacement of the elastic clamping member 2 in directions perpendicular to its elastic deformation (e.g., the horizontal direction), thereby preventing positional shifts due to lateral displacement during clamping. By constraining the degrees of freedom in non-elastic deformation directions, it ensures that the elastic clamping member 2 deforms only along a preset elastic deformation direction (e.g., the vertical direction), thus maintaining the stable posture of the valve bulb 3 within the clamping space and preventing tilting and torsion.

[0041] In a preferred embodiment, the guide wall 12 is a guide slope that extends obliquely from the surface of the base 1 toward the bottom of the receiving groove 11, and the elastic clamping member 2 has an inclined surface 222 that cooperates with the guide slope.

[0042] In this embodiment, the guide wall 12 is designed as a sloping structure extending inclinedly from the surface of the base 1 to the bottom of the groove, and the elastic clamping member 2 is correspondingly provided with a matching sloping surface 222, forming a sloping surface mating mechanism. This design ensures that when the elastic clamping member 2 is subjected to external force, the contact surface between the sloping surface 222 and the guide sloping surface generates a constraint force component perpendicular to the sloping direction, thereby effectively limiting the displacement of the elastic clamping member 2 in the direction perpendicular to its elastic deformation (i.e., the vertical direction). In particular, the mating relationship between the guide sloping surface and the clamping member's sloping surface 222 can convert the vertical displacement of the clamping member into sliding along the sloping direction through the geometric constraint of the sloping surface. This allows the clamping member to move normally in the direction of elastic deformation while eliminating the degree of freedom in the vertical direction, thereby preventing the valve bulb 3 from tilting or twisting during clamping. Compared with the traditional vertical limiting structure, this sloping surface mating mechanism can achieve multi-directional displacement restriction through geometric constraints without affecting the elastic performance of the clamping member.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A clamping mechanism for valve blanks, characterized in that, The device includes two symmetrically arranged bases (1), which are configured to be relatively far apart or relatively close together. Each base (1) has an elastic clamping member (2) installed on its opposite side. The two elastic clamping members (2) are opposite to each other and bend toward the center to form a clamping space. The clamping space is configured to clamp the valve stem (3) so as to clamp and fix the valve stem (3) by the elastic deformation force of the elastic clamping members (2).

2. The clamping mechanism for valve blanks according to claim 1, characterized in that, The elastic clamping member (2) includes a fixing part (21) and two clamping parts (22). The two clamping parts (22) are respectively connected to the two ends of the fixing part (21) and extend upward relative to the fixing part (21). The two clamping parts (22) are symmetrically arranged with respect to the vertical central axis. The ends of the two clamping parts (22) extend towards each other and elastically contact the outer peripheral surface of the valve bulb (3) to form an elastic clamping of the valve bulb (3).

3. The clamping mechanism for valve blanks according to claim 2, characterized in that, The fixing part (21) is a flat sheet structure, and the clamping part (22) is an arc-shaped sheet structure protruding towards the vertical central axis.

4. The clamping mechanism for valve blanks according to claim 3, characterized in that, The inner surface of the clamping part (22) has an arc-shaped curved surface (221) that is adapted to the outer peripheral shape of the valve bulb (3).

5. The clamping mechanism for valve blanks according to claim 2, characterized in that, The elastic clamping member (2) is integrally stamped and bent from a metal sheet.

6. The clamping mechanism for valve blanks according to claim 2, characterized in that, The fixing part (21) is installed on the base (1) by fasteners.

7. The clamping mechanism for valve blanks according to claim 2, characterized in that, A clamping space is formed between the clamping portions (22) of the two elastic clamping members (2). In the natural state, the minimum distance between the clamping spaces is less than the diameter of the valve bulb (3).

8. The clamping mechanism for valve blanks according to claim 1 or 2, characterized in that, The elastic clamping element (2) is a spring sheet.

9. The clamping mechanism for valve blanks according to claim 1, characterized in that, The base (1) is provided with a receiving groove (11), the receiving groove (11) includes a pair of oppositely arranged guide walls (12), the guide walls (12) are configured to cooperate with the clamping part of the elastic clamping member (2) to limit the displacement of the elastic clamping member (2) in a direction perpendicular to its elastic deformation.

10. The clamping mechanism for valve blanks according to claim 9, characterized in that, The guide wall (12) is a guide slope that extends obliquely from the surface of the base (1) toward the bottom of the receiving groove (11), and the elastic clamping member (2) has an inclined surface (222) that cooperates with the guide slope.

Images