A forming device for producing nitrile gloves

Abstract

The present application relates to a kind of forming device for nitrile glove production, including hand mould, hand mould is connected with mounting block, quick coupling sleeve is fixed on mounting block, plug-in hole is provided on quick coupling sleeve, plug-in column is provided in plug-in hole, one end of plug-in column is connected with adapter, n-shaped slide rail groove is provided on the outer side wall of plug-in column, the one end of slide rail groove forms passageway entrance, the other end of slide rail groove forms limiting hole, positioning hole is provided on quick coupling sleeve, the outer side end of positioning hole is provided with cover plate, positioning column is connected with positioning hole, spring is abutted between positioning column and cover plate, spring will drive positioning column to move radially in positioning hole;After plug-in column is inserted into plug-in hole and rotated to pull out, the inner side end of positioning column can slide along slide rail groove after passing through passageway entrance and be inserted in limiting hole, form quick locking structure between plug-in column and quick coupling sleeve.The present application is favorable to solve the problem that some existing forming device needs to be disassembled with the aid of tool and has poor durability.

Description

Technical Field

[0001] This invention relates to the field of glove forming and processing equipment, and in particular to a forming device for producing nitrile gloves. Background Technology

[0002] Nitrile gloves are widely used in numerous fields, including medical, industrial, and laboratory applications, due to their excellent oil resistance, abrasion resistance, and chemical corrosion resistance. Their manufacturing process involves several complex and critical steps, typically including dipping, vulcanization, water cleaning, drying and molding, inflation inspection, low-temperature setting, medium-temperature drying, washing, dehydration, drying again, and packaging. Throughout the production process, each step requires the coordinated participation of glove molds and conveyor belts. The glove molds are generally made of ceramic to ensure their stability and durability during production.

[0003] Currently, in the molding process of nitrile gloves, glove molds need to be installed on a conveyor belt and run continuously. Existing glove molds are generally threaded to the conveyor belt and there is no convenient disassembly and assembly mechanism. After long-term use, rust will appear. Once the glove mold is damaged and needs to be replaced, the rust may make it difficult to disassemble and assemble the glove mold. Damage will greatly reduce the yield of nitrile gloves. Moreover, replacing the glove mold requires the production line to be shut down for a long time. The difficulty of replacement will significantly reduce the production efficiency and progress of nitrile gloves, and waste manpower and resources. This not only affects the normal production of nitrile gloves, but also causes losses to users.

[0004] In response, Chinese patent CN218342649U discloses a nitrile glove molding device, including a hand mold. The hand mold has a connector at its top, with several pressure grooves on its arc surface. The hand mold also has a roller at its top, and a sleeve at its top, which fits onto the connector. A clamping bolt is located on the arc surface of the sleeve. The roller is rotatably connected to an adapter. While this technical solution improves the connection method of the hand mold to some extent, it still has significant drawbacks in practical application. In this solution, the hand mold and roller are locked together by a clamping bolt. This structure requires tools to tighten the clamping bolt during the assembly and disassembly of the hand mold. After repeated assembly and disassembly, the threaded holes on the roller that mate with the clamping bolt are prone to thread wear. Once the threads wear, the connection stability of the hand mold is affected, potentially causing it to loosen or even fall off during production, affecting the production quality of the nitrile gloves. Furthermore, worn threads make the assembly and disassembly of the hand mold more difficult, further reducing production efficiency. Therefore, the above technical solutions still have the drawbacks of requiring tools for disassembling and assembling hand molds and having poor durability, which cannot meet the requirements of modern nitrile glove production for high efficiency, stability and durability. Summary of the Invention

[0005] This invention provides a molding device for nitrile glove production, which helps to solve the problems of existing molding devices that require tools for disassembly and assembly and have poor durability.

[0006] This invention is implemented as follows:

[0007] A molding apparatus for producing nitrile gloves includes a hand mold. A mounting block is detachably connected to one end of the hand mold away from the molding area. A quick-connect sleeve is fixedly mounted on the mounting block. An insertion hole is axially provided on the quick-connect sleeve. A plug post is detachably inserted into the insertion hole. One end of the plug post extends to the outside of the insertion hole and is connected to an adapter. An N-shaped slide rail groove is provided on the outer wall of the plug post. One end of the slide rail groove forms a passage inlet at the axial end of the plug post, and the other end of the slide rail groove forms a limiting hole radially recessed in the side wall of the plug post. The sleeve has a positioning hole with a radial through hole structure on its side wall. A cover plate is provided at the outer end of the positioning hole. The cover plate is detachably connected to the quick-connect sleeve. A positioning pin is movably connected to the positioning hole on the inner side of the cover plate. A spring abuts between the positioning pin and the cover plate. In the free state, the spring will drive the positioning pin to move radially inward in the positioning hole. After the insertion pin is inserted into the insertion hole according to the threshold condition and rotated and pulled outward, the inner end of the positioning pin can slide along the slide rail groove after passing through the passage inlet and be inserted into the limiting hole, forming a quick-connect locking structure between the insertion pin and the quick-connect sleeve.

[0008] Based on the above technical solution, the inner corner of the positioning post is rounded. After pressing the quick-connect sleeve toward the insertion post according to the threshold condition, the inner end of the positioning post can be disengaged from the limiting post and into the slide rail groove.

[0009] Based on the above technical solution, a number of quick-connect locking structures are provided between the plug-in post and the quick-connect sleeve in a centrally symmetrical distribution.

[0010] Based on the above technical solution, the hand mold and the mounting block are connected by mounting bolts.

[0011] Based on the above technical solution, an anti-detachment structure is provided between the positioning post and the limiting hole.

[0012] Based on the above technical solution, the anti-detachment structure includes a washer fixed to the outer surface of the positioning post, and the washer is made of elastic material.

[0013] Based on the above technical solution, the washer has an annular structure, with an adhesive part that is fixedly connected to the positioning post at its radial inner end, an anti-slip part on the radial outer periphery of the adhesive part, and a hollowed-out softening cavity inside the anti-slip part.

[0014] Based on the above technical solution, the positioning post and the cover plate are provided with limiting groove structures on adjacent sides to prevent the spring from shifting.

[0015] Based on the above technical solution, the adapter has an L-shaped structure and a pivot connection between the adapter and the plug. The plug can rotate relative to the adapter around its own axial centerline.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. This invention achieves tool-free, rapid assembly and disassembly of hand molds through a quick-connect locking structure. Compared to traditional threaded connections, operators do not need tools such as wrenches; they can complete the assembly of the hand mold simply by inserting, rotating, and pulling. Disassembly is also simple, requiring only pressing, rotating, and pulling out, significantly reducing assembly and disassembly time. During production, if the glove mold is damaged and needs replacement, the replacement can be completed quickly, reducing production line downtime and improving production efficiency. For example, with traditional threaded connections, replacing a glove mold may take tens of minutes or even longer, while with the quick-connect structure of this invention, the replacement time can be reduced to a few minutes, greatly improving production continuity.

[0018] 2. This invention significantly improves durability by avoiding thread wear issues. Traditional threaded connections are prone to thread wear after repeated disassembly and assembly, leading to loose connections or even complete failure to connect. The quick-connect structure of this invention does not rely on threaded connections; it achieves locking through the cooperation of the positioning pin, slide rail groove, and limiting hole, eliminating thread wear and improving connection durability. Even under frequent disassembly and assembly, it ensures a stable and reliable connection between the hand mold and the mounting block, reducing production failures and equipment damage caused by connection problems and lowering maintenance costs.

[0019] 3. Regarding production efficiency and cost, the device of this invention improves the production efficiency and progress of nitrile gloves while reducing labor and material costs. Because the hand molds are easy to assemble and disassemble, it reduces production line downtime, allowing for more continuous production and improving equipment utilization. Simultaneously, it reduces the workload and maintenance time for maintenance personnel, lowering labor costs. Furthermore, it avoids production delays and product quality issues caused by difficulties in changing glove molds, reduces raw material waste, and lowers production costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a molding device for producing nitrile gloves in one embodiment;

[0022] Figure 2 for Figure 1 Side view of the connection structure of the mounting block, quick-connect sleeve, plug-in post, and adapter;

[0023] Figure 3 for Figure 2 A cross-sectional view;

[0024] Figure 4 for Figure 3 A magnified view of part A in the image;

[0025] Figure 5 This is a schematic diagram showing the structure of the plug-in pin located inside the plug-in hole;

[0026] Figure 6 This is a schematic diagram of the slide rail groove structure;

[0027] Figure 7 This is a partial schematic diagram of the assembly structure of the positioning column in another embodiment;

[0028] Figure 8 for Figure 7 A three-dimensional structural diagram of the center positioning post;

[0029] Figure 9 This is a one-sided sectional view of a washer in one embodiment.

[0030] The diagram is labeled as follows: 100, hand mold; 200, mounting block; 210, mounting bolt; 300, quick-connect sleeve; 310, insertion hole; 320, positioning hole; 330, positioning post; 331, washer; 3311, adhesive part; 3312, anti-slip part; 3313, softening cavity; 340, cover plate; 341, closing bolt; 350, spring; 400, insertion post; 410, slide rail groove; 411, passage inlet; 412, limit hole; 500, adapter. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0032] In the description of this invention, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] Example 1: Combination Figure 1-6 As shown in the figure, this embodiment discloses a molding device for nitrile glove production, mainly including a hand mold 100, a mounting block 200, a quick-connect sleeve 300, a plug-in post 400, an adapter 500, a positioning post 330, a cover plate 340, and a spring 350. This invention aims to effectively solve the problems of existing molding devices requiring tools for assembly and disassembly and having poor durability, thereby improving the efficiency and quality of nitrile glove production and reducing production costs.

[0036] Specifically, the hand mold 100 is a key component in the molding of nitrile gloves, such as... Figure 1 As shown, the end of the hand mold 100 furthest from the molding area (its finger and palm areas are the molding area) is detachably connected to a mounting block 200. This detachable connection facilitates individual maintenance and replacement of the hand mold 100, improving the flexibility and maintainability of the equipment. In this embodiment, the hand mold 100 and the mounting block 200 are connected by two mounting bolts 210. The mounting bolt connection method has the advantages of strong connection and easy disassembly, which can meet the connection requirements between the hand mold 100 and the mounting block 200. In practical applications, the mounting block 200 and the hand mold 100 are pre-connected and fixed assemblies, meaning that the hand mold 100 and the mounting block 200 are simultaneously assembled and disassembled.

[0037] Combination Figure 1 and Figure 2 As shown, a quick-connect sleeve 300 is fixedly mounted on the mounting block 200. In this embodiment, the quick-connect sleeve 300 is fixed to the mounting block 200 by welding, and the quick-connect sleeve 300 provides the mounting base for the entire quick-connect structure. Combined with... Figure 3 and Figure 5 As shown, the quick-connect sleeve 300 has an axial insertion hole 310. If the hand mold 100 is defined as being located below the mounting block 200, the insertion hole 310 forms an opening structure at the axial top of the quick-connect sleeve 300. An insertion post 400 is detachably inserted into the insertion hole 310. The bottom of the insertion post 400 can be inserted into or pulled out of the insertion hole 310. The outer contour of the insertion post 400 matches the inner contour of the insertion hole 310, and the insertion fit between the two will not loosen or wobble.

[0038] One end of the plug-in post 400 extends to the outside of the plug-in hole 310 and is connected to an adapter 500. The adapter 500 is used to connect to a conveyor belt or other transmission components to enable the hand mold 100 to operate during the production process. In this embodiment, refer to Figure 1 or... Figure 2 The adapter 500 has an L-shaped structure, which better adapts to the layout of conveyor belts or other transmission components, making the installation of the hand mold 100 more flexible. The adapter 500 and the insertion post 400 are pivotally connected, allowing the insertion post 400 to rotate relative to the adapter 500 around its own axial centerline. This pivotal design allows the hand mold 100 to rotate at a certain angle during production as needed, improving its mobility and contributing to higher molding quality of nitrile gloves.

[0039] Furthermore, in combination Figure 5 and Figure 6 As shown, the outer wall of the plug-in post 400 is provided with an n-shaped slide rail groove 410. The design of the slide rail groove 410 is key to achieving quick connection and locking. One end of the slide rail groove 410 forms a passage inlet 411 at the axial end of the plug-in post 400, and the other end forms a limiting hole 412 radially recessed on the side wall of the plug-in post 400. The passage inlet 411 is used for the inner end of the positioning post 330 to slide into the slide rail groove 410, and the limiting hole 412 is used to cooperate with the positioning post 330 to form a snap-fit ​​locking structure.

[0040] Correspondingly, combined Figure 2 and Figure 4As shown, the quick-connect sleeve 300 has a positioning hole 320 with a radial through hole structure on its side wall. The cross-sectional profile of the positioning hole 320 is T-shaped, and its radial outer profile is larger than its radial inner profile. A cover plate 340 is provided at the outer end of the positioning hole 320. The cover plate 340 is detachably connected to the quick-connect sleeve 300. This detachable connection method facilitates the installation and maintenance of the positioning post 330 and the spring 350. In this embodiment, the cover plate 340 is assembled with the threaded hole on the quick-connect sleeve 300 by the closing bolts 341 on the left and right sides. After installation, the cover plate 340 is located inside the positioning hole 320 and does not protrude from the outer side wall of the quick-connect sleeve 300. A positioning hole 320 is located inside the cover plate 340 and is movably connected to a positioning post 330. The cross-sectional profile of the positioning post 330 is T-shaped, which matches the inner end profile of the positioning hole 320. It will not fall out of the positioning hole 320 into the insertion hole 310, and the inner end of the positioning post 330 can slide stably laterally in and out of the positioning hole 320. A spring 350 abuts against the positioning post 330 and the cover plate 340. In the free state, the spring 350 will drive the positioning post 330 to move radially inward in the positioning hole 320, so that the positioning post 330 always maintains the tendency to move towards the insertion post 400.

[0041] Both the positioning post 330 and the cover plate 340 have limiting groove structures on adjacent sides to prevent the spring 350 from shifting. During equipment operation, the spring 350 may shift due to vibration or other reasons, affecting its normal operation. The limiting groove structure can effectively restrict the position of the spring 350, keeping it in the correct position and ensuring that the spring 350 can properly drive the positioning post 330 to move radially inward, thus improving the stability and reliability of the entire quick-connect structure.

[0042] When the plug pin 400 is inserted into the plug hole 310 according to the threshold condition (that is, the position of the slide rail groove 410 is aligned with the position of the positioning hole 320, which can be achieved by marking lines) and rotated and pulled outward, the inner end of the positioning pin 330 can slide along the slide rail groove 410 after passing through the passage inlet 411 and be inserted into the limiting hole 412, thus forming a quick-connect locking structure between the plug pin 400 and the quick-connect sleeve 300. This quick-connect locking structure does not require tools, and the installation of the hand mold 100 can be completed by simple insertion, rotation and pulling operations; when disassembling, the positioning pin 330 can be disengaged from the limiting hole 412 by a specific operation, and the plug pin 400 can be pulled out of the plug hole 310, which greatly improves the efficiency of the assembly and disassembly of the hand mold 100. Specifically, when the plug pin 400 is inserted into the plug hole 310 at a suitable angle, the inner end of the positioning pin 330, which originally extends into the plug hole 310, will enter the slide rail groove 410 through the passage inlet 411. The inner end of the positioning pin 330 slides axially relative to the plug pin 400 in the slide rail groove 410 to the target position and is blocked from continuing to slide axially. At this time, the user rotates the plug pin 400 or the hand mold 100 in a suitable direction (the purpose is to make the plug pin 400 and the positioning pin 330 move relative to each other). The inner end of the positioning post 330 can continue to slide along the transverse section of the slide rail groove 410, but is then blocked and cannot continue to slide laterally. Then the user continues to push the plug post 400 or the hand mold 100 (the purpose is to make the plug post 400 and the positioning post 330 move axially relative to each other). The inner end of the positioning post 330 will slide axially along the slide rail groove 410 to the limiting hole 412. The spring 350 provides an inward pushing force, so that the inner end of the positioning post 330 is embedded in the limiting hole 412, forming a quick-locking structure.

[0043] To make the sliding of the positioning pin 330 relative to the slide rail groove 410 smoother, the corners of the slide rail groove 410 are provided with smooth chamfering.

[0044] The axial inner corner of the positioning post 330 is rounded. When the quick-connect sleeve 300 is pressed towards the insertion post 400 according to a threshold condition (i.e., applying a certain force), the inner end of the positioning post 330 can disengage from the limiting post and enter the slide rail groove 410. The rounded corner design makes the sliding of the positioning post 330 within the slide rail groove 410 smoother, reducing jamming and improving the reliability and stability of the quick-connect structure. Simultaneously, this design also facilitates quick disengagement of the positioning post 330 from the limiting hole 412 by pressing the quick-connect sleeve 300 during disassembly, further simplifying the disassembly operation. During actual disassembly, pulling the insertion post 400 or using the hand mold 100 causes the inner end of the positioning post 330 to disengage from the limiting hole 412. Reversing the operation allows the inner end of the positioning post 330 to slide along the path of the slide rail groove 410, thus disengaging the quick-connect sleeve 300 and the insertion post 400.

[0045] In this embodiment, two quick-connect locking structures are provided between the plug-in post 400 and the quick-connect sleeve 300, arranged symmetrically in a central configuration. The two quick-connect locking structures ensure a more secure connection between the plug-in post 400 and the quick-connect sleeve 300, evenly distributing the stress generated during the connection process and improving the load-bearing capacity of the entire connection structure. In practical applications, the number of quick-connect locking structures can be appropriately set according to the size of the hand mold 100 and the usage requirements to ensure the stability and reliability of the connection.

[0046] In this embodiment, the design of the n-shaped slide rail groove 410 makes the position distribution of the limiting hole 412 safer and more reliable. When the hand mold 100 moves with the external transmission mechanism, the positioning pin 330 will not fall out of the limiting hole 412.

[0047] Example 2: Based on Example 1, combined with Figure 7-9 As shown, in this embodiment, an anti-detachment structure is provided between the positioning post 330 and the limiting hole 412 to prevent the positioning post 330 from accidentally falling out of the limiting hole 412 during the production process, thus ensuring the stability of the quick-connect structure. The anti-detachment structure includes a washer 331 fixed to the outer surface of the positioning post 330. The washer 331 is made of an elastic material (such as rubber). The washer 331 made of elastic material has good elasticity and cushioning performance, and can play a role in buffering and fixing between the positioning post 330 and the limiting hole 412.

[0048] Furthermore, the washer 331 has a ring-shaped structure, with an adhesive portion 3311 on its radially inner end that is fixedly connected to the positioning post 330. An anti-slip portion 3312 is provided on the radially outer periphery of the adhesive portion 3311, and a hollowed-out softening cavity 3313 is provided inside the anti-slip portion 3312. The adhesive portion 3311 ensures a firm connection between the washer 331 and the positioning post 330, preventing the washer 331 from falling off during use. The anti-slip portion 3312 increases the friction between the washer 331 and the inner wall of the limiting hole 412, further improving the anti-fall-off performance of the positioning post 330. The hollowed-out softening cavity 3313 gives the washer 331 a certain degree of flexibility, allowing it to better adapt to changes in the gap between the positioning post 330 and the limiting hole 412, enhancing the anti-fall-off effect.

[0049] The molding device for nitrile glove production of the present invention has significant advantages in terms of ease of assembly and disassembly, durability, production efficiency, cost, yield, and adaptability. It can meet the requirements of modern nitrile glove production for high efficiency, stability, and durability, and has broad market application prospects.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A molding apparatus for producing nitrile gloves, characterized in that, Includes a hand mold (100), with a mounting block (200) detachably connected to one end of the hand mold (100) away from the molding operation area. A quick-connect sleeve (300) is fixedly mounted on the mounting block (200). The quick-connect sleeve (300) has an axially extending insertion hole (310). An insertion post (400) is detachably inserted into the insertion hole (310). One end of the insertion post (400) extends to the outside of the insertion hole (310) and is connected to an adapter (500). An n-shaped slide rail groove (410) is provided on the outer wall of the insertion post (400). One end of the slide rail groove (410) forms a passage inlet (411) at the axial end of the insertion post (400). The other end of the rail groove (410) is radially recessed in the side wall of the plug post (400) to form a limiting hole (412). The side wall of the quick-connect sleeve (300) is provided with a positioning hole (320) with a radial through hole structure. The outer end of the positioning hole (320) is provided with a cover plate (340). The cover plate (340) is detachably connected to the quick-connect sleeve (300). The positioning hole (320) is located inside the cover plate (340) and is movably connected to a positioning post (330). A spring (350) abuts between the positioning post (330) and the cover plate (340). In the free state, the spring (350) will drive the positioning post (330) to move radially inward in the positioning hole (320). After the plug-in pin (400) is inserted into the plug-in hole (310) according to the threshold condition and rotated and pulled outward, the inner end of the positioning pin (330) can slide along the slide rail groove (410) after passing through the passage inlet (411) and be inserted into the limiting hole (412), thus forming a quick-locking structure between the plug-in pin (400) and the quick-connect sleeve (300); An anti-detachment structure is provided between the positioning post (330) and the limiting hole (412); The anti-detachment structure includes a washer (331) fixed to the outer surface of the positioning post (330), the washer (331) being made of an elastic material.

2. The molding apparatus for producing nitrile gloves according to claim 1, characterized in that, The axial inner corner of the positioning post (330) is rounded. After pressing the quick-connect sleeve (300) toward the plug post (400) according to the threshold condition, the inner end of the positioning post (330) can be disengaged from the limiting post and into the slide rail groove (410).

3. The molding apparatus for producing nitrile gloves according to claim 1, characterized in that, Several quick-connect locking structures are provided between the plug post (400) and the quick-connect sleeve (300) in a centrally symmetrical distribution.

4. The molding apparatus for producing nitrile gloves according to claim 1, characterized in that, The hand mold (100) is connected to the mounting block (200) by mounting bolts (210).

5. The molding apparatus for producing nitrile gloves according to claim 1, characterized in that, The washer (331) is an annular structure, with an adhesive part (3311) that is fixedly connected to the positioning post (330) at its radial inner end. The adhesive part (3311) is provided with an anti-slip part (3312) on its radial outer periphery, and the anti-slip part (3312) is provided with a hollowed-out softening cavity (3313).

6. The molding apparatus for producing nitrile gloves according to claim 1, characterized in that, The positioning post (330) and the cover plate (340) are provided with limiting groove structures on adjacent sides to prevent the spring (350) from moving.

7. The molding apparatus for producing nitrile gloves according to claim 1, characterized in that, The adapter (500) has an L-shaped structure and a pivot connection between the adapter (500) and the plug (400). The plug (400) can rotate relative to the adapter (500) around its own axial centerline.

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