Thermoplastic tubing stretch test fixture for bead production

Abstract

The application relates to the technical field of stretching clamps, in particular to a thermoplastic pipe stretching test clamp for bead production, which comprises a clamping platform, a porous semicircular clamping plate, a sliding support, a connecting frame, a stepping motor, a bidirectional screw rod and a clamping assembly, the sliding support is slidingly connected to the inner side of the bottom of the clamping platform, the porous semicircular clamping plate is installed on the opposite side of the clamping assembly, the clamping assembly is fixedly connected to the top of the sliding support, the motor shaft of the stepping motor is fixedly connected to one end of the bidirectional screw rod through a shaft coupling, and the bidirectional screw rod is screwedly connected to the inner side of the connecting frame. The thermoplastic pipe stretching test clamp for bead production has the advantages that the clamping surface of the porous semicircular clamping plate is in a semicircular structure, the common clamping effect is realized in cooperation with another group of porous semicircular clamping plates, the inner diameters of the pipeline grooves on the inner side of the porous semicircular clamping plate are the same, different types of pipes can be placed into the matched grooves, and the clamping effect is improved.

Description

Technical Field

[0001] This application relates to the field of tensile clamp technology, and in particular to a tensile testing clamp for thermoplastic tubing used in bead production. Background Technology

[0002] Beads are primarily made of glass and plastic. The production process typically involves melting the raw materials (plastic and glass), followed by drawing, cutting, and beading. The drawing machine is the core equipment for this process. After the tubing is processed, a tensile test is performed on the outer diameter of the tubing to ensure its quality and performance meet relevant standards and requirements, thus facilitating the subsequent processing into beads of the desired size.

[0003] The tensile yield stress of thermoplastic pipes is considered an important indicator for testing the mechanical properties of plastic pipes. The accuracy of the pipe tensile property test results is affected by many factors. In addition to objective reasons such as the accuracy of the testing machine and extensometer itself, it is also affected by various factors such as the selection of extensometer, clamping position, type of testing machine fixtures, and sample area measurement.

[0004] For example, Chinese patent publication number CN217033356U discloses an arc-shaped clamp device for tensile testing of small-diameter thermoplastic pipes. By rotating the screw-in pressure rod, the movable clamp is brought close to the fixed clamp and clamps and fixes the end of the small-diameter thermoplastic pipe. Since the concave and convex arc surfaces can better fit the arc-shaped end of the small-diameter thermoplastic pipe, and with the design of the serrated protective surface, the friction force during clamping can be significantly increased, making it less likely for the clamp to slip during the test.

[0005] Regarding the aforementioned technologies, the inventors believe that the following technical defects exist and require improvement:

[0006] Commonly used arc-shaped clamping devices for pipe tensile testing only serve a clamping function and cannot be quickly adapted to the pipe's diameter, and their coordination with pipe tensile testing is poor. Utility Model Content

[0007] This application provides a tensile testing fixture for thermoplastic tubing used in bead production to address the following technical problems:

[0008] Commonly used arc-shaped clamping devices for pipe tensile testing only serve a clamping function and cannot be quickly adapted to the pipe's diameter, and their coordination with pipe tensile testing is poor.

[0009] This application provides a tensile testing fixture for thermoplastic tubing used in beadwork production, employing the following technical solution:

[0010] A tensile testing fixture for thermoplastic tubing used in bead production includes a clamping platform, a porous semi-circular clamping plate, a sliding bracket, a connecting frame, a stepper motor, a bidirectional screw, and a clamping assembly. The sliding bracket is slidably connected to the inner bottom of the clamping platform. The porous semi-circular clamping plate is installed on the opposite side of the clamping assembly. The clamping assembly is fixedly connected to the top of the sliding bracket. The motor shaft of the stepper motor is fixedly connected to one end of the bidirectional screw via a coupling. The bidirectional screw is threadedly connected to the inner side of the connecting frame.

[0011] The clamping platform is used to support the sliding bracket, the stepper motor is used to drive the bidirectional screw to move the two sets of sliding brackets synchronously relative to each other or in opposite directions, the multi-hole semi-arc clamp is used to connect with the multi-hole semi-arc clamp on the other side and firmly clamp pipes of different sizes, and the clamping assembly is used to push the multi-hole semi-arc clamps closer to each other.

[0012] In one feasible technical solution of this application, the porous semi-arc clamp has several sets of pipeline grooves on the side near the pipe, and the inner diameter of the pipeline grooves decreases sequentially from top to bottom.

[0013] In one feasible technical solution of this application, the clamping assembly includes a hydraulic cylinder, a guide rod, a fixing plate, and a limiting block. The output end of the hydraulic cylinder is fixedly connected to the surface of the guide rod, the outer side of the guide rod is fixedly connected to the middle part of the fixing plate, the fixing plate is symmetrically distributed on both sides of the top of the sliding bracket, and the limiting block is fixedly connected to the top of the fixing plate.

[0014] In one feasible technical solution of this application, multiple sets of compression springs are also fixedly connected to the opposite sides of the fixing plate and the porous semi-arc clamp.

[0015] In one feasible technical solution of this application, a telescopic rod is further installed on the inner side of the compression spring, and the telescopic rod is used to limit the deformation angle of the compression spring.

[0016] In one feasible technical solution of this application, a linear shaft is further provided at the top of the sliding bracket, and the linear shaft passes through the interior of the limiting block and is fixedly connected to the surface of the sliding bracket.

[0017] In one feasible technical solution of this application, the limiting block has a through hole that matches the size of the linear shaft.

[0018] In one feasible technical solution of this application, the connecting frame is further provided with a threaded groove that matches the external thread size of the bidirectional screw.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] The multi-hole semi-circular clamping plate of this product has a semi-circular clamping surface, which works in conjunction with another set of multi-hole semi-circular clamping plates to achieve a joint clamping effect. The inner diameter of the pipe grooves on the inner side of the multi-hole semi-circular clamping plates is the same in all parts, so different types of pipes can be placed into the appropriate grooves, thereby enhancing the clamping effect. In addition, the stepper motor can be used to complete the auxiliary stretching effect of the clamped pipes, improving practicality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a tensile testing fixture for thermoplastic tubing used in bead production, according to an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure inside the clamping platform in the embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the threaded groove in an embodiment of this application.

[0025] Figure 4 This is a top view of the clamping component in an embodiment of this application.

[0026] Figure 5 This is a distribution diagram of the telescopic rods in the embodiments of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Clamping platform; 2. Perforated semi-circular clamping plate; 3. Sliding bracket; 4. Connecting frame; 5. Stepper motor; 6. Bidirectional screw;

[0029] 7. Clamping assembly; 71. Hydraulic cylinder; 72. Guide rod; 73. Fixing plate; 74. Limit block;

[0030] 8. Pipeline groove; 9. Compression spring; 10. Telescopic rod; 11. Linear shaft; 12. Through hole; 13. Threaded groove. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0036] This application discloses a tensile testing fixture for thermoplastic tubing used in beadwork production. (Refer to...) Figure 1 The tensile testing fixture for thermoplastic tubing used in bead production includes a clamping platform 1, a perforated semi-circular clamping plate 2, a sliding bracket 3, a connecting frame 4, a stepper motor 5, a bidirectional screw 6, and a clamping assembly 7. The sliding bracket 3 is slidably connected to the bottom inner side of the clamping platform 1. The perforated semi-circular clamping plate 2 is installed on the opposite side of the clamping assembly 7. The clamping assembly 7 is fixedly connected to the top of the sliding bracket 3. The motor shaft of the stepper motor 5 is fixedly connected to one end of the bidirectional screw 6 through a coupling. The bidirectional screw 6 is threadedly connected to the inner side of the connecting frame 4.

[0037] The clamping platform 1 is used to support the sliding bracket 3, the stepper motor 5 is used to drive the bidirectional screw 6 to move the two sets of sliding brackets 3 synchronously relative to each other or in opposite directions, the multi-hole semi-arc clamp 2 is used to connect with the multi-hole semi-arc clamp 2 on the other side and firmly clamp the pipes of different sizes, and the clamping assembly 7 is used to push the multi-hole semi-arc clamp 2 closer to each other.

[0038] The porous semi-circular clamp 2 has several sets of pipeline grooves 8 on the side near the pipe, and the inner diameter of the pipeline grooves 8 decreases from top to bottom.

[0039] The clamping assembly 7 includes a hydraulic cylinder 71, a guide rod 72, a fixing plate 73, and a limiting block 74. The output end of the hydraulic cylinder 71 is fixedly connected to the surface of the guide rod 72. The outer side of the guide rod 72 is fixedly connected to the middle part of the fixing plate 73. The fixing plates 73 are symmetrically distributed on both sides of the top of the sliding bracket 3. The limiting block 74 is fixedly connected to the top of the fixing plate 73.

[0040] Multiple sets of compression springs 9 are also fixedly connected to the opposite sides of the fixed plate 73 and the porous semi-circular clamping plate 2.

[0041] A telescopic rod 10 is also installed on the inner side of the compression spring 9. The telescopic rod 10 is used to limit the deformation angle of the compression spring 9.

[0042] A linear shaft 11 is also provided on the top of the sliding bracket 3. The linear shaft 11 passes through the interior of the limiting block 74 and is fixedly connected to the surface of the sliding bracket 3.

[0043] The limiting block 74 has a through hole 12 that matches the size of the linear shaft 11.

[0044] The connecting bracket 4 is also provided with a threaded groove 13 that matches the external thread size of the bidirectional screw 6.

[0045] The general process of using the thermoplastic tubing tensile testing fixture for bead production according to this application embodiment is as follows:

[0046] Before stretching, the top hydraulic cylinder 71 can be activated simultaneously, and its output end pushes the guide rod 72 to push the fixing plate 73. The two sets of fixing plates 73 push their respective multi-hole semi-arc clamps 2 to move relative to each other, thereby completing the clamping and holding of the pipe. On the other hand, the multi-hole semi-arc clamps 2 have multiple sets of pipe grooves 8 with different diameters. After the pipe grooves 8 are connected, they form a complete circle, which can clamp pipes of different sizes, improving the use effect and saving the time of changing the clamps. Then, the outer stepper motor 5 is activated, and the stepper motor 5 drives the bidirectional screw 6 to rotate. The two sets of bidirectional screws 6 rotating in the same direction pass through the interior of the connecting frame 4, thereby preventing the sliding bracket 3 from rotating with them. Under the limiting action of the two sets of bidirectional screws 6, the threaded groove 13 opened on the connecting frame 4 cooperates with the threaded surface of the bidirectional screw 6, so that the two sets of sliding brackets 3 can move in opposite directions synchronously along the horizontal direction of the bidirectional screws 6, so that the clamped pipe can complete the mechanized stretching.

[0047] The beneficial technical effects of the thermoplastic tubing tensile testing fixture for bead production according to the embodiments of this application are roughly as follows:

[0048] The multi-hole semi-arc clamping plate 2 of this product has a semi-arc structure for its clamping surface. It works in conjunction with another set of multi-hole semi-arc clamping plates 2 to achieve a joint clamping effect. The inner diameter of the pipe groove 8 on the inner side of the multi-hole semi-arc clamping plate 2 is the same in all parts, so different types of pipes can be placed into the appropriate grooves, thereby enhancing the clamping effect. In addition, the stepper motor 5 can be used to complete the auxiliary stretching effect of the clamped pipe, improving its practicality.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tensile testing fixture for thermoplastic tubing used in bead production, characterized in that, The device includes a clamping platform (1), a multi-hole semi-arc clamping plate (2), a sliding bracket (3), a connecting frame (4), a stepper motor (5), a bidirectional screw (6), and a clamping assembly (7). The sliding bracket (3) is slidably connected to the bottom inner side of the clamping platform (1). The multi-hole semi-arc clamping plate (2) is installed on the opposite side of the clamping assembly (7). The clamping assembly (7) is fixedly connected to the top of the sliding bracket (3). The motor shaft of the stepper motor (5) is fixedly connected to one end of the bidirectional screw (6) through a coupling. The bidirectional screw (6) is threadedly connected to the inner side of the connecting frame (4). The clamping platform (1) is used to support the sliding bracket (3), the stepper motor (5) is used to drive the bidirectional screw (6) to move the two sets of sliding brackets (3) synchronously relative to each other or in opposite directions, the multi-hole semi-arc clamp (2) is used to connect with the multi-hole semi-arc clamp (2) on the other side and firmly clamp the pipes of different sizes, and the clamping assembly (7) is used to push the multi-hole semi-arc clamp (2) closer to each other.

2. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 1, characterized in that, The porous semi-arc clamp (2) has several sets of pipeline grooves (8) on the side near the pipe, and the inner diameter of the pipeline grooves (8) decreases from top to bottom.

3. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 1, characterized in that, The clamping assembly (7) includes a hydraulic cylinder (71), a guide rod (72), a fixing plate (73), and a limiting block (74). The output end of the hydraulic cylinder (71) is fixedly connected to the surface of the guide rod (72). The outer side of the guide rod (72) is fixedly connected to the middle part of the fixing plate (73). The fixing plates (73) are symmetrically distributed on both sides of the top of the sliding bracket (3). The limiting block (74) is fixedly connected to the top of the fixing plate (73).

4. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 3, characterized in that, Multiple sets of compression springs (9) are also fixedly connected to the opposite sides of the fixed plate (73) and the porous semi-arc clamp (2).

5. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 4, characterized in that, A telescopic rod (10) is also installed on the inner side of the compression spring (9), and the telescopic rod (10) is used to limit the deformation angle of the compression spring (9).

6. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 3, characterized in that, The top of the sliding bracket (3) is also provided with a linear shaft (11), which passes through the interior of the limiting block (74) and is fixedly connected to the surface of the sliding bracket (3).

7. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 6, characterized in that, The limiting block (74) has a through hole (12) that matches the size of the linear shaft (11).

8. The tensile testing fixture for thermoplastic tubing used in bead production according to claim 1, characterized in that, The connecting frame (4) is also provided with a threaded groove (13) that matches the external thread size of the bidirectional screw (6).

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