An adjustable clamp for a variable cross-section hollow cone sleeve preform stitching apparatus

Abstract

The application discloses a kind of adjustable clamps for variable cross-section hollow conical sleeve prefabricated body sewing equipment, including first arc concave and second arc concave being arranged on base plate;The left side of first arc concave is equipped with rotary drive mechanism, rotary drive mechanism is connected with a turntable supported on first arc concave, the right side surface center of turntable is equipped with conical pressing cover;Conical support body is arranged between first arc concave and second arc concave, the tip of conical support body is aligned with conical pressing cover, the open end of conical support body is supported on second arc concave, conical support body and turntable are connected by connecting column, two clamping jaw structures are arranged on the circumference of the open end of conical support body;The arc-shaped moving plate of conical support body is equipped with by spacing adjusting mechanism realizes outward movement or inward retraction.The application has the advantages of stable clamping and automatic feeding, effectively clamps variable cross-section hollow conical sleeve prefabricated body during sewing process, and is beneficial to improve sewing quality.

Description

Technical Field

[0001] This invention belongs to the field of tooling and fixture technology, specifically relating to an adjustable fixture for a stitching device for a hollow conical sleeve preform with variable cross-section. Background Technology

[0002] In the stitching process of composite preforms, common flat preforms can be stitched using a sewing machine. However, for variable cross-section hollow conical sleeve composite preforms, ordinary sewing machines cannot stitch them, and special stitching equipment specifically designed for variable cross-section hollow conical sleeve preforms is required.

[0003] Because the variable cross-section hollow conical composite preform has an irregular and complex shape and a certain degree of flexibility, the special sewing equipment mentioned above, in addition to having a special sewing head and a special moving platform, also needs to be equipped with special clamps to achieve effective clamping of the variable cross-section hollow conical composite preform during the sewing process.

[0004] However, existing conical clamps often have these defects, such as insufficient clamping force leading to unstable clamping and inability to achieve precise feeding, which affects the processing quality, reduces processing efficiency, and ultimately causes the workpiece to fail to meet the accuracy requirements, or even causes the workpiece to fall off during processing, resulting in safety accidents.

[0005] For example, invention patent CN114986412A discloses an adjustable conical clamp for stably holding conical workpieces; however, this clamp lacks adjustability and cannot clamp hollow conical sleeve preforms with varying cross-sections and specifications. As another example, utility model patent CN213411213U discloses a multifunctional cylindrical clamp, but this clamp cannot clamp hollow conical sleeve preforms with varying cross-sections.

[0006] It is evident that there are currently few types of traditional conical clamps on the market, and even fewer clamps that can stably hold hollow conical workpieces with variable cross-sections. These clamps are completely unable to meet the stitching requirements of prefabricated hollow conical sleeves with variable cross-sections. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an adjustable clamp for a stitching device for a hollow conical sleeve preform with a variable cross-section, thereby solving the problem that existing conical clamps cannot stably hold the hollow conical sleeve preform with a variable cross-section during stitching.

[0008] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0009] An adjustable clamp for a stitching device for a hollow conical sleeve preform with variable cross-section includes a base. A first arc-shaped recess and a second arc-shaped recess are fixedly disposed on the upper surface of the base. A rotary drive mechanism is disposed on the left side of the first arc-shaped recess, and the rotary drive mechanism is connected to the left side of a turntable. The turntable is rotatably supported on the first arc-shaped recess. A conical pressure sleeve is disposed at the center of the right side of the turntable. The second arc-shaped recess is located to the right of the first arc-shaped recess, and a clamp is disposed between the first and second arc-shaped recesses. A conical support body is provided, with the tip of the conical support body aligned with the conical pressure sleeve. The open end of the conical support body is rotatably supported on the second arc-shaped concave platform. The circumference of the open end of the conical support body and the circumference of the turntable are fixedly connected by four parallel connecting columns, and two gripper structures are provided on the circumference of the open end of the conical support body. Arc-shaped moving plates are provided on both sides of the conical support body, and the two arc-shaped moving plates can be synchronously moved outward or inward on both sides of the conical support body through a spacing adjustment mechanism.

[0010] Furthermore, the circumferential contour of the turntable is adapted to the arcuate contour of the first arcuate concave platform; the circumferential contour of the open end of the conical support is adapted to the arcuate contour of the second arcuate concave platform; and the inner surface of the conical pressure sleeve is adapted to the outer surface of the cone tip of the variable cross-section hollow conical sleeve preform.

[0011] Furthermore, the gripper structure includes a connecting base, on which two support columns are fixedly connected to both the front and rear sides. The lower ends of the four support columns are jointly fixedly connected to a cylinder base. A small cylinder is fixedly connected to the upper surface of the cylinder base via a cylinder flange. The cylinder rod of the small cylinder passes downward through the cylinder base and is fixedly connected to a moving rod. The left and right ends of the moving rod are respectively hinged to the upper ends of a corresponding transmission connecting rod. The left and right ends of the cylinder base are respectively hinged to the upper ends of a corresponding finger connecting rod. The lower ends of the transmission connecting rods are respectively hinged to the middle bending points of the corresponding finger connecting rods. The bottom ends of the two finger connecting rods are respectively fixedly provided with concave clamping blocks and convex clamping blocks. When the gripper structure is installed on the conical support, the connecting base is circumferentially fixedly connected to the open end of the conical support. The concave clamping block is installed on the bottom end of the finger connecting rod located on the outer side wall of the open end of the conical support, and the convex clamping block is installed on the bottom end of the finger connecting rod located on the inner side wall of the open end of the conical support.

[0012] Furthermore, both the upper and lower ends of each support column are fixedly connected to the connecting base and the cylinder base by locking screws.

[0013] Furthermore, the concave surface of the concave clamping block is adapted to the outer surface of the open portion of the variable cross-section hollow conical sleeve preform, and the convex surface of the convex clamping block is adapted to the inner surface of the open portion of the variable cross-section hollow conical sleeve preform.

[0014] Furthermore, the drive structure includes a motor bracket fixed to the upper surface of the chassis, and the motor bracket is located on the left side of the first arc-shaped recess. A servo motor is mounted on the motor bracket, and the servo motor is fixedly connected to the center of the left side of the turntable via a coupling.

[0015] Furthermore, the main body of the conical support is a conical cylinder. The upper surface of the conical cylinder has a fan-shaped gap for the sewing machine head to pass through during sewing. The open end of the conical cylinder has a semi-circular ring plate for installing the gripper structure and for connecting the connecting column. The two sides of the conical cylinder have sliding groove holes for the arc-shaped moving plate to move outward or inward. The lower surface of the conical cylinder has clearance holes for the spacing adjustment mechanism to be installed on the chassis.

[0016] Furthermore, the two arc-shaped movable plates are movably embedded in the left and right sliding slots, respectively. The spacing adjustment mechanism includes a T-shaped bracket, a lead screw, a lead screw nut, a worm gear, and a worm, all located within the conical support body. The bottom of the T-shaped bracket is fixedly connected to the chassis through the clearance hole. The worm gear is rotatably mounted on the top of the T-shaped bracket. The two ends of the lead screw are threadedly connected to the inner surfaces of the left and right arc-shaped movable plates through corresponding lead screw nuts. The worm gear is fixedly sleeved on the lead screw and meshes with the worm gear.

[0017] Furthermore, the worm gear is provided with a rocker adjustment shaft to facilitate rotation of the worm gear.

[0018] Furthermore, two lead screws are arranged parallel to each other between the two arc-shaped moving plates on the left and right sides, and a worm gear is fixedly sleeved on each lead screw. Both worm gears mesh with the worm gear.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention utilizes a conical support to support the variable cross-section hollow conical sleeve preform during sewing, preventing deformation. A fan-shaped opening on the surface of the conical support facilitates needle puncture. Two gripper structures clamp the preform during sewing, preventing rotation relative to the support. A conical pressure sleeve contacts the tip of the preform, compressing it and preventing detachment. Therefore, this invention offers advantages such as stable clamping and automatic feeding, effectively clamping the preform during sewing and improving sewing quality.

[0021] This invention fixes two grippers to the bottom of a conical support. By starting a cylinder, a moving rod is driven to move up and down. The moving rod transmits power to a transmission link, thereby achieving synchronous swinging of the two finger links. Concave and convex gripping blocks are fixedly installed at the ends of the two finger links, respectively. The surfaces of the concave and convex gripping blocks are adapted to the outer and inner surfaces of the variable cross-section hollow conical preform, respectively, thus achieving stable clamping of the variable cross-section hollow conical preform during the sewing process.

[0022] This invention achieves precise rotation of the variable cross-section hollow conical preform relative to the sewing machine head by setting a servo motor to drive the coupling to rotate, which in turn drives the turntable to rotate, and the turntable drives the conical support body to rotate together. This results in the suture stitches required during the sewing process of the variable cross-section hollow conical preform.

[0023] This invention provides a method for adjusting the distance between two curved moving plates on both sides of a conical support body by setting up curved moving plates on both sides and a set of worm gear and lead screw mechanism. This allows the curved moving plates on both sides to move outward or inward synchronously relative to the conical support body, thus adapting to the clamping of hollow conical prefabricated bodies with different sizes and cross-sections.

[0024] This invention also provides a method for calculating clamping force, which can accurately calculate the force that the cylinder should provide, so that the preform will not be damaged due to excessive clamping force, nor will the preform loosen during the sewing process due to insufficient clamping force.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 This is a front view of the gripper structure in this invention.

[0029] Figure 3 This is a perspective view of the gripper structure in this invention.

[0030] Figure 4 This is a schematic diagram of the concave clamping block of the gripper structure in this invention.

[0031] Figure 5 This is a schematic diagram of the convex clamping block of the gripper structure in this invention.

[0032] Figure 6 This is a force diagram of the gripper structure in this invention. Detailed Implementation

[0033] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the invention's purpose, features, and advantages. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but are merely illustrative of the essential spirit of the invention's technical solution.

[0034] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0035] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0036] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0037] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0038] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] See Figure 1 As shown, an adjustable clamp for a variable cross-section hollow conical sleeve preform sewing device includes a chassis 17. In one embodiment of the invention, the chassis 17 is rectangular to facilitate assembly with the four-degree-of-freedom platform of the variable cross-section hollow conical sleeve preform sewing device.

[0040] A first arc-shaped recess 2a is fixedly provided on the upper surface of the chassis 17. A rotary drive mechanism is provided on the left side of the first arc-shaped recess 2a. The rotary drive mechanism is connected to the left side of a turntable 7. A conical pressure sleeve 9 is provided at the center of the right side of the turntable 7. The circumferential contour of the turntable 7 is adapted to the arc contour of the first arc-shaped recess 2a so that the turntable 7 can be rotatably supported on the first arc-shaped recess 2a.

[0041] As an embodiment of the present invention, the drive structure includes a motor bracket 4 fixed on the upper surface of the chassis 17, and the motor bracket 4 is located on the left side of the first arc-shaped recess 2a. A servo motor 11 is provided on the motor bracket 4, and the servo motor 11 is fixedly connected to the center of the left side of the turntable 7 through a coupling 10.

[0042] A second arc-shaped recess 2b is fixedly provided on the upper surface of the chassis 17, and the second arc-shaped recess 2b is located to the right of the first arc-shaped recess 2a. A conical support 5 is provided between the first arc-shaped recess 2a and the second arc-shaped recess 2b. The tip of the conical support 5 is aligned with the conical pressure sleeve 9. The circumferential contour of the open end of the conical support 5 is adapted to the arc contour of the second arc-shaped recess 2b, so that the open end of the conical support 5 can be rotatably supported on the second arc-shaped recess 2b.

[0043] The circumference of the open end of the conical support 5 and the circumference of the turntable 7 are fixedly connected by four parallel connecting columns 8. The servo motor 11 drives the turntable 7 and the conical pressure sleeve 9 to rotate synchronously through the coupling 10, and the turntable 7 drives the conical support 5 to rotate synchronously through the four connecting columns 8.

[0044] Two gripper structures 6 are provided on the circumference of the open end of the conical support 5. See also Figure 2-5 As shown in one embodiment of the present invention, the gripper structure 6 includes a connecting base 601. Two support columns 602 are fixedly connected to both the front and rear sides of the connecting base 601 via locking screws. The lower ends of the four support columns 602 are jointly fixedly connected to a cylinder base 603 via locking screws. A small cylinder 605 is fixedly connected to the upper surface of the cylinder base 603 via a cylinder flange 604. The cylinder rod of the small cylinder 605 passes downward through the cylinder base 603 and is fixedly connected to a moving rod 606. The left and right ends of the moving rod 606 are respectively hinged to the upper ends of a corresponding transmission connecting rod 607. The left and right ends of the cylinder base 603 are respectively hinged to a corresponding transmission connecting rod 607. The upper end of the corresponding finger link 608 is hinged, and the lower ends of the two transmission links 607 are respectively hinged to the middle bending point of the corresponding finger link 608. The bottom ends of the two finger links 608 are respectively fixedly provided with a concave clamping block 609 and a convex clamping block 610. When the claw structure 6 is installed on the conical support body 5, the connecting base 601 is circumferentially fixedly connected to the open end of the conical support body 5. The concave clamping block 609 is installed on the bottom end of the finger link 608 located on the outer side wall of the open end of the conical support body 5, and the convex clamping block 610 is installed on the bottom end of the finger link 608 located on the inner side wall of the open end of the conical support body 5.

[0045] Arc-shaped movable plates 12 are respectively provided on both sides of the conical support 5. The two arc-shaped movable plates 12 can be moved outward or inward synchronously on both sides of the conical support 5 through a spacing adjustment mechanism.

[0046] As an embodiment of the present invention, the main body of the conical support 5 is a conical cylinder. The upper surface of the conical cylinder is provided with a fan-shaped gap for the sewing machine head to pass through during sewing. The open end of the conical cylinder is provided with a semi-circular ring plate for installing the clamping structure 6 and for connecting the connecting column 8. The two side surfaces of the conical cylinder are provided with sliding groove holes for the arc-shaped moving plate 12 to move outward or inward. The lower surface of the conical cylinder is provided with clearance holes for the spacing adjustment mechanism to be installed on the chassis 17.

[0047] The two arc-shaped movable plates 12 are movably embedded in the left and right sliding slots, respectively. In one embodiment of the invention, the spacing adjustment mechanism includes a T-shaped bracket 18, a lead screw 13, a lead nut, a worm gear 14, and a worm 15, all located within the conical support body 5. The bottom of the T-shaped bracket 18 is fixedly connected to the chassis 17 through the clearance hole. The worm 15 is rotatably mounted on the top of the T-shaped bracket 18. Both ends of the lead screw 13 are threadedly connected to the inner surfaces of the left and right arc-shaped movable plates 12 through corresponding leads. The worm gear 14 is fixedly sleeved on the lead screw 13 and meshes with the worm 15. The worm 15 is provided with a rocker adjustment shaft 16 for easy rotation.

[0048] The worm gear 15 drives the lead screw 13 to rotate through the worm wheel 14. The two ends of the lead screw 13 cause the two arc-shaped moving plates 12 on the left and right to move outward or inward synchronously on the lead screw 13 through the corresponding nuts, thereby realizing the adjustment of the distance between the two arc-shaped moving plates 12.

[0049] Preferably, two lead screws 13 are arranged in parallel between the two arc-shaped moving plates 12 on the left and right sides. Each lead screw 13 is fixedly fitted with a worm gear 14. Both worm gears 14 are engaged with the worm 15 to ensure the stability of the movement of the arc-shaped moving plates 12.

[0050] In this invention, the conical support 5 is used to support the variable cross-section hollow conical sleeve preform during stitching, preventing deformation. Two clamping structures 6 are used to clamp the variable cross-section hollow conical sleeve preform, preventing it from detaching from the conical support 5. Therefore, the concave surface of the concave clamping block 609 of the clamping structure 6 is adapted to the outer surface of the open portion of the variable cross-section hollow conical sleeve preform, and the convex surface of the convex clamping block 610 is adapted to the inner surface of the open portion of the variable cross-section hollow conical sleeve preform, so that the clamping structure 6 can stably clamp the variable cross-section hollow conical sleeve preform, thereby preventing rotation of the variable cross-section hollow conical sleeve preform relative to the conical support. The conical pressure sleeve 9 is used to contact the conical tip of the variable cross-section hollow conical sleeve preform, holding the variable cross-section hollow... The conical sleeve preform is pressed tightly, so the inner surface of the conical pressure sleeve 9 matches the outer surface of the cone tip of the variable cross-section hollow conical sleeve preform, thereby preventing the variable cross-section hollow conical sleeve preform from falling off; the two arc-shaped moving plates 12 are adjusted by a set of worm gear and screw nut mechanism to adjust the distance between the two arc-shaped moving plates, thereby realizing the synchronous outward or inward movement of the two arc-shaped moving plates relative to the conical support, thus adapting to the clamping of hollow conical preforms of different sizes and specifications; the rotary drive mechanism is used to realize the precise rotation of the variable cross-section hollow conical preform relative to the sewing machine head, obtaining the sewing stitches required in the sewing process of the variable cross-section hollow conical preform.

[0051] This invention provides a method for calculating the force of an adjustable clamp used in a stitching device for hollow conical precast bodies with variable cross-sections. The specific steps are as follows:

[0052] 1. First, establish a rectangular coordinate system and mark the rod vector and azimuth of each component. Then, assume the reaction force of each component is...

[0053] (1)

[0054] (2)

[0055] 2. First-solve kinematic pair: The condition for the first-solve kinematic pair in a mechanism is that the external forces and torques acting on the two components constituting the kinematic pair are both known. In this mechanism, kinematic pair B is the first-solve kinematic pair.

[0056] Find F B Consider component 3 as a separate body, and take the moment of the force on component 1 about point B, then ∑M B =0.

[0057] Therefore

[0058] (3)

[0059] Similarly, taking component 2 as a separate body, and taking the moment of the force on component 2 about point A, ∑M A =0.

[0060] (4)

[0061] (5)

[0062] (6)

[0063] (7)

[0064] From this we can obtain

[0065] (8)

[0066] (9)

[0067] Find F A According to the equilibrium conditions of the forces on component 1, component 1 is subjected to two forces F in the x-direction. Ax and -F Ax If these two forces are equal in magnitude and opposite in direction, then:

[0068] (10)

[0069] According to the force calculation method of the present invention, the force that the cylinder should provide can be accurately calculated, so that the preform will not be damaged due to excessive clamping force, nor will the preform loosen during the sewing process due to insufficient clamping force.

[0070] Therefore, the present invention has the advantages of stable clamping and automatic feeding, and realizes effective clamping of the variable cross-section hollow conical sleeve preform during the sewing process, which is beneficial to improving the sewing quality of the variable cross-section hollow conical sleeve preform.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An adjustable clamp for a sewing device for a hollow conical sleeve prefabricated body with variable cross-section, characterized in that: Includes a chassis (17), on the upper surface of which a first arc-shaped recess (2a) and a second arc-shaped recess (2b) are fixedly provided; a rotary drive mechanism is provided on the left side of the first arc-shaped recess (2a), the rotary drive mechanism is connected to the left side of a turntable (7), the turntable (7) is rotatably supported on the first arc-shaped recess (2a), and a conical pressure sleeve (9) is provided at the center of the right side of the turntable (7); the second arc-shaped recess (2b) is located to the right of the first arc-shaped recess (2a), and a conical support body is provided between the first arc-shaped recess (2a) and the second arc-shaped recess (2b). 5) The cone tip of the cone support (5) is aligned with the cone pressure sleeve (9). The open end of the cone support (5) is rotatably supported on the second arc-shaped concave platform (2b). The circumference of the open end of the cone support (5) and the circumference of the turntable (7) are fixedly connected by four parallel connecting columns (8). Two claw structures (6) are provided on the circumference of the open end of the cone support (5). Arc-shaped moving plates (12) are provided on both sides of the cone support (5). The two arc-shaped moving plates (12) are adjusted by a spacing mechanism to move outward or inward synchronously on both sides of the cone support (5). The main body of the conical support (5) is a conical cylinder. The upper surface of the conical cylinder is provided with a fan-shaped gap for the sewing machine head to pass through during sewing. The open end of the conical cylinder is provided with a semi-circular ring plate for installing the clamp structure (6) and for connecting the connecting column (8). The two sides of the conical cylinder are provided with sliding groove holes for the arc-shaped moving plate (12) to move outward or inward. The lower surface of the conical cylinder is provided with clearance holes for the spacing adjustment mechanism to be installed on the chassis (17). The two arc-shaped movable plates (12) are respectively movably embedded in the left and right sliding groove holes. The spacing adjustment mechanism includes a T-shaped bracket (18), a lead screw (13), a lead screw nut, a worm wheel (14), and a worm (15) all located in the conical support body (5). The bottom of the T-shaped bracket (18) is fixedly connected to the chassis (17) through the clearance hole. The worm (15) is rotatably set on the top of the T-shaped bracket (18). The two ends of the lead screw (13) are respectively threaded to the inner sides of the left and right arc-shaped movable plates (12) through the corresponding lead screw nuts. The worm wheel (14) is fixedly sleeved on the lead screw (13), and the worm wheel (14) meshes with the worm (15).

2. The adjustable clamp for stitching a variable cross-section hollow conical sleeve preform according to claim 1, characterized in that: The circumferential contour of the turntable (7) is adapted to the arc contour of the first arc-shaped concave platform (2a); the circumferential contour of the open end of the conical support (5) is adapted to the arc contour of the second arc-shaped concave platform (2b); the inner surface of the conical pressure sleeve (9) is adapted to the outer surface of the cone tip of the variable cross-section hollow conical sleeve preform.

3. The adjustable clamp for stitching a variable cross-section hollow conical sleeve preform according to claim 1, characterized in that: The gripper structure (6) includes a connecting base (601). Two support columns (602) are fixedly connected to both the front and rear sides of the connecting base (601). The lower ends of the four support columns (602) are fixedly connected to the cylinder base (603). A small cylinder (605) is fixedly connected to the upper surface of the cylinder base (603) through a cylinder flange (604). The cylinder rod of the small cylinder (605) passes downward through the cylinder base (603) and is fixedly connected to a moving rod (606). The left and right ends of the moving rod (606) are respectively hinged to the upper ends of a corresponding transmission link (607). The left and right ends of the cylinder base (603) are respectively hinged to the upper ends of a corresponding finger link (608). Next, the lower ends of the two transmission links (607) are respectively hinged to the middle bending point of the corresponding finger link (608), and the bottom ends of the two finger links (608) are respectively fixedly provided with concave clamping blocks (609) and convex clamping blocks (610); when the claw structure (6) is installed on the conical support (5), the connecting base (601) is circumferentially fixedly connected to the open end of the conical support (5), the concave clamping block (609) is installed on the bottom end of the finger link (608) located on the outside of the side wall of the open end of the conical support (5), and the convex clamping block (610) is installed on the bottom end of the finger link (608) located on the inside of the side wall of the open end of the conical support (5).

4. The adjustable clamp for stitching a variable cross-section hollow conical sleeve preform according to claim 3, characterized in that: The upper and lower ends of each of the support columns (602) are fixedly connected to the connecting base (601) and the cylinder base (603) by locking screws.

5. The adjustable clamp for stitching a prefabricated hollow conical sleeve with variable cross-section according to claim 3, characterized in that: The concave surface of the concave clamping block (609) is adapted to the outer surface of the open portion of the variable cross-section hollow conical sleeve preform, and the convex surface of the convex clamping block (610) is adapted to the inner surface of the open portion of the variable cross-section hollow conical sleeve preform.

6. The adjustable clamp for stitching a variable cross-section hollow conical sleeve preform according to claim 1, characterized in that: The rotary drive mechanism includes a motor bracket (4) fixed on the upper surface of the chassis (17), and the motor bracket (4) is located on the left side of the first arc-shaped recess (2a). A servo motor (11) is provided on the motor bracket (4), and the servo motor (11) is fixedly connected to the center of the left side of the turntable (7) through a coupling (10).

7. The adjustable clamp for sewing equipment for variable cross-section hollow conical sleeve preforms according to claim 1, characterized in that: The worm (15) is provided with a rocker adjustment shaft (16) for easy rotation of the worm (15).

8. The adjustable clamp for stitching a variable cross-section hollow conical sleeve preform according to claim 1, characterized in that: Two lead screws (13) are arranged in parallel between the two arc-shaped moving plates (12) on the left and right sides. Each lead screw (13) is fixedly fitted with a worm gear (14), and both worm gears (14) mesh with the worm (15).

Images