Safety pin structure of rotating shaft of metering pump

Abstract

The utility model relates to metering pump drive part technical field especially relates to a kind of metering pump rotating shaft safety pin structure, including safety pin main body, first limiting part is equipped in one end of main body, and the other end detachably installs limiting piece, main body is fixed in circumference by being penetrated by two shaft sleeves, and outer periphery is equipped with transverse fracture groove to be accurate fracture. The second limiting part of first limiting part and limiting piece is equipped with limiting structure, and this structure includes limiting bolt and the elastic support of compression state. When overload, main body is fractured at fracture groove, elastic support pushes the fracture section to separate to both sides, to avoid clamping joint;Limiting step part is set to prevent main body axial jump, and limiting bolt nut avoids that fracture piece is thrown out. It ensures that metering pump can reliably stop after overload, guarantees spinning fineness uniform, improves equipment safety and maintenance convenience.

Description

Technical Field

[0001] This utility model relates to the technical field of metering pump transmission components, specifically to the safety pin structure of the rotating shaft of a metering pump. Background Technology

[0002] In chemical fiber spinning production, metering pumps, as the core equipment for melt delivery, directly affect the linear density uniformity and physical properties of the spun products due to their operational stability. Metering pumps are typically driven by a speed reducer, and precise control of the speed is used to achieve quantitative delivery of the melt. The power transmission system between the two must simultaneously meet the dual requirements of high torque transmission accuracy and overload protection.

[0003] During production, when a metering pump experiences abnormally high rotational resistance, the industry commonly uses a safety pin breakage mechanism to protect it. Under normal circumstances, after the safety pin breaks, the drive motor's output shaft continues to rotate, while the metering pump's rotating shaft should stop. At this point, the spinneret stops spinning, and the winding device, due to continuous winding, will produce noticeable broken wires at the spinneret location, making it easy for staff to detect the fault promptly. After maintenance personnel replace the safety pin and restart the metering pump, the spinneret can resume normal spinning. However, in actual operation, the existing safety pin structure often exhibits the following problem: the safety pin fails to completely detach after breakage. When the drive motor rotates the second bushing approximately half a turn, the broken end of the safety pin on the second bushing side becomes stuck with the broken end on the first bushing side, causing the second bushing to continue driving the first bushing to rotate, thus restarting the metering pump, which should have stopped. During this process, the melt ejection rate of the metering pump is significantly insufficient, resulting in a finer fiber diameter in the middle section of the fiber bundle. Since no obvious fiber breakage occurs, this unevenly distributed fiber bundle is directly wound into the fiber cake, severely affecting product quality. Simultaneously, because the metering pump is constantly running, it is difficult for staff to visually determine whether the safety pin has broken.

[0004] In the Chinese Patent Document Database, patent application number 202420140236.4 discloses an improved device for the connecting shaft of a high-permeability nylon 6 spinning metering pump. It uses painted marking lines on the outer circumference of both bushings; when the safety pin breaks, the two marking lines misalign to indicate a fault. However, in practical applications, this solution only provides a status indication after breakage. If workers fail to address the issue promptly, the broken safety pin may re-engage after misalignment and continue transmitting power, failing to fundamentally prevent product quality problems. Utility Model Content

[0005] The purpose of this invention is to provide a safety pin structure for the rotating shaft of a metering pump to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a safety pin structure for the rotating shaft of a metering pump, comprising a safety pin body, a first limiting part fixed at one end of the length of the safety pin body, the safety pin body passing through a first bushing and a second bushing, for circumferentially fixing the first bushing and the second bushing; the first limiting part abutting against the outer end face of the first bushing, and a limiting component detachably installed at the end of the safety pin body away from the first limiting part, and the limiting component abutting against the outer end face of the second bushing away from the first bushing, for axially limiting the safety pin body; both the first limiting part and the limiting component are provided with limiting structures, the limiting structures being used to generate elastic thrust when the safety pin body breaks, driving the broken segment of the safety pin body and the limiting component to move away from each other and remain separated.

[0007] Furthermore, the limiting structure includes a limiting bolt and an elastic support member sleeved on the limiting bolt; both the first limiting part and the limiting member are provided with through holes to accommodate the limiting bolt sliding back and forth along its length; both the first bushing and the second bushing are provided with threaded holes adapted to the limiting bolt for fixing the limiting bolt; the elastic support member is respectively disposed between the first limiting part and the first bushing, and between the limiting member and the second bushing, and the elastic support member is always in a compressed state.

[0008] Furthermore, a transverse fracture groove is provided on the outer peripheral wall of the safety pin body, and the transverse fracture groove is located at one end of the safety pin body near the contact surface of the first bushing and the second bushing. The thickness of the bottom of the transverse fracture groove is less than the thickness of other parts of the safety pin body.

[0009] Furthermore, a first limiting step is provided at the connection between the safety pin body and the first limiting part. The outer diameter of the first limiting step is larger than the outer diameter of the safety pin body and smaller than the outer diameter of the first limiting part. The first limiting step abuts against the outer end face of the first bushing during assembly.

[0010] Furthermore, the limiting member includes a threaded portion and a second limiting portion fixed to one axial end of the threaded portion; the end of the safety pin body away from the first limiting portion is provided with an internal threaded hole adapted to the threaded portion, and the threaded portion is screwed into the internal threaded hole to achieve a detachable connection; the outer diameter of the second limiting portion is larger than the outer diameter of the safety pin body, and the second limiting portion abuts against the outer side wall of the second bushing to achieve axial limiting.

[0011] Furthermore, a second limiting step is provided at the connection between the threaded portion and the second limiting portion. The outer diameter of the second limiting step is larger than the outer diameter of the threaded portion and smaller than the outer diameter of the second limiting portion. The second limiting step abuts against the outer end face of the second bushing during assembly.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The safety pin structure of the metering pump rotating shaft, by setting a safety pin body and a limiting component, after the safety pin body passes through the first and second bushings, the first limiting part and the limiting component can play an axial limiting role. By setting the limiting structure, the limiting structure is installed and positioned with the first and second bushings respectively, so as to generate an elastic thrust when the safety pin body breaks, driving the broken section of the safety pin body and the limiting component to move away from each other and keep them separated, thus preventing the broken safety pin from being stuck and fixed, affecting product quality. At the same time, the limiting structure can limit the safety pin body and the limiting component, preventing the broken safety pin from being thrown out and causing danger. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is an exploded view of the present invention;

[0015] Figure 3 This is a schematic diagram of the assembly state structure of this utility model;

[0016] Figure 4 This is a partial cross-sectional view of the assembled structure of this utility model.

[0017] In the figure: 1. Safety pin body; 101. First limiting part; 102. Transverse fracture groove; 103. First limiting step part; 2. Limiting component; 201. Threaded part; 202. Second limiting part; 203. Second limiting step; 3. Limiting structure; 301. Limiting bolt; 302. Elastic support component; 4. First bushing; 5. Second bushing; 6. Rotating shaft. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] Please see Figure 1-4 This utility model provides an embodiment of a safety pin structure for the rotating shaft of a metering pump, comprising a safety pin body 1, with a first limiting part 101 fixed at one long end of the safety pin body 1. The outer diameter of the first limiting part 101 is larger than the outer diameter of the safety pin body 1. The safety pin body 1 passes through a first bushing 4 and a second bushing 5, and is used to fix the first bushing 4 and the second bushing 5 circumferentially. During installation, the rotating shaft of the metering pump is fixedly connected to the first bushing 4, and the rotating shaft 6 of the reducer is fixedly connected to the second bushing 5, transmitting torque through the safety pin body 1.

[0020] A transverse fracture groove 102 is provided on the outer peripheral wall of the safety pin body 1, and the transverse fracture groove 102 is located at one end of the safety pin body 1 near the contact surface of the first bushing 4 and the second bushing 5. The thickness of the bottom of the transverse fracture groove 102 is less than the thickness of other parts of the safety pin body 1, forming a structural weak area, ensuring that the safety pin body 1 can accurately break at the transverse fracture groove 102 when the load is too large, thereby achieving overload protection for the equipment.

[0021] The first limiting part 101 abuts against the outer end face of the first bushing 4. A limiting member 2 is detachably installed at the end of the safety pin body 1 away from the first limiting part 101, and the limiting member 2 abuts against the outer end face of the second bushing 5 away from the first bushing 4, together achieving axial limiting of the safety pin body 1. Specifically, as... Figure 2 As shown, the limiting member 2 includes a threaded portion 201 and a second limiting portion 202 fixed to one axial end of the threaded portion 201; the end of the safety pin body 1 away from the first limiting portion 101 is provided with an internal threaded hole that is adapted to the threaded portion 201, and the threaded portion 201 is screwed into the internal threaded hole to achieve a detachable connection; the outer diameter of the second limiting portion 202 is larger than the outer diameter of the safety pin body 1, and the second limiting portion 202 abuts against the outer side wall of the second bushing 5 to achieve axial limiting.

[0022] Both the first limiting part 101 and the second limiting part 202 on the limiting member 2 are provided with limiting structures 3. The limiting structures 3 are used to generate elastic thrust when the safety pin body 1 breaks, driving the broken section of the safety pin body 1 and the limiting member 2 to move away from each other and remain separated. Figure 1-2 As shown, the limiting structure 3 includes a limiting bolt 301 and an elastic support 302 sleeved on the limiting bolt 301. In this embodiment, the elastic support 302 is specifically a helical spring. Both the first limiting part 101 and the limiting member 2 are provided with through holes to accommodate the limiting bolt 301 sliding back and forth along its length. The first bushing 4 and the second bushing 5 are both provided with threaded holes adapted to the limiting bolt 301 for fixing the limiting bolt 301. The elastic support 302 is respectively disposed between the first limiting part 101 and the first bushing 4, and between the second limiting part 202 and the second bushing 5, and the elastic support 302 is always in a compressed state. During assembly, the limiting bolt 301 is passed through the through hole on the first limiting part 101 or the second limiting part 202, and then threadedly connected to the first bushing 4 and the second bushing 5. The two ends of the elastic support 302 abut against the first limiting part 101 and the first bushing 4, or the second limiting part 202 and the second bushing 5, respectively. When the safety pin body 1 breaks, the elastic support 302 at both ends releases its elastic potential, pushing the two broken sections to move to both sides, which can effectively prevent the transmission from being restored due to the broken ends jamming together; at the same time, the nut of the limiting bolt 301 can play a limiting role, preventing the safety pin body 1 or the limiting part 2 from being thrown out after the breakage.

[0023] In this embodiment, to prevent the elastic force of the elastic support 302 from causing the safety pin body 1 to move axially within the through hole, a first limiting step 103 is provided at the connection between the safety pin body 1 and the first limiting part 101. The outer diameter of the first limiting step 103 is larger than the outer diameter of the safety pin body 1 but smaller than the outer diameter of the first limiting part 101. The first limiting step 103 abuts against the outer end face of the first bushing 4 during assembly. A second limiting step 203 is provided at the connection between the threaded part 201 and the second limiting part 202. The outer diameter of the second limiting step 203 is larger than the outer diameter of the threaded part 201 but smaller than the outer diameter of the second limiting part 202. The second limiting step 203 abuts against the outer end face of the second bushing 5 during assembly. The first limiting step 103 and the second limiting step 203 together form a limiting fit, while reserving space for the elastic support 302 after compression.

[0024] Working principle: During assembly, firstly, the limiting member 2 is rotated off the safety pin body 1. Then, the limiting bolts 301 are passed through the through holes on the first limiting part 101 and the second limiting part 202 respectively. Next, the elastic support members 302 are respectively sleeved on the limiting bolts 301, so that one end of the elastic support member 302 abuts against the first limiting part 101 and the limiting member 2 respectively. Then, the safety pin body 1 is passed through the through holes on the first bushing 4 and the second bushing 5 in sequence. Then, the threaded part 201 is tightened and fixed to the end of the safety pin body 1 away from the first limiting part 101 until the second limiting step 203 abuts against the second bushing 5 and the first limiting step part 103 abuts against the first bushing 4, so that the first bushing 4 and the second bushing 5 are relatively fixed. Finally, each limiting bolt 301 is tightened so that it is threaded and fixed to the first bushing 4 and the second bushing 5 respectively. At this time, the other end of the elastic support member 302 abuts against the first bushing 4 and the second bushing 5 respectively and is in a compressed state.

[0025] When a fault occurs during the transmission of the drive motor and the metering pump, causing the transverse fracture groove 102 of the safety pin body 1 to break, the elastic support members 302 at both ends release elastic potential energy instantaneously, pushing the two broken parts to move to both sides and maintain a separated state. This effectively avoids the problem of the broken end rotating half a turn and then re-clamping in the traditional structure, fundamentally preventing the abnormal operation of the metering pump in the fault state and ensuring product quality. At the same time, the nut of the limit bolt 301 can limit the movement range of the broken body and prevent it from being thrown out and causing safety hazards.

[0026] In the description of this utility model, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and do not specifically refer to any order or sequence, nor are they intended to limit this utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" are interpreted broadly, including fixed connection, detachable connection, mechanical or electrical connection, direct or indirect connection, and internal communication of components. The specific meaning can be understood by those skilled in the art in conjunction with practical experience. The directional terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer" are based on the orientations shown in the accompanying drawings and are for ease of description only, not constituting a limitation on the device's structure.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A safety pin structure for the rotating shaft of a metering pump, comprising a safety pin body (1), wherein a first limiting part (101) is fixed at one end of the length of the safety pin body (1), characterized in that, The safety pin body (1) passes through the first bushing (4) and the second bushing (5) and is used to fix the first bushing (4) and the second bushing (5) circumferentially. The first limiting part (101) abuts against the outer end face of the first bushing (4). The end of the safety pin body (1) away from the first limiting part (101) is detachably equipped with a limiting member (2), and the limiting member (2) abuts against the outer end face of the second bushing (5) away from the first bushing (4) and is used to limit the axial movement of the safety pin body (1). The first limiting part (101) and the limiting member (2) are both provided with a limiting structure (3). The limiting structure (3) is used to generate an elastic thrust when the safety pin body (1) breaks, driving the broken section of the safety pin body (1) and the limiting member (2) to move away from each other and remain separated.

2. The metering pump rotating shaft safety pin structure according to claim 1, characterized in that, The limiting structure (3) includes a limiting bolt (301) and an elastic support member (302) sleeved on the limiting bolt (301); both the first limiting part (101) and the limiting member (2) are provided with through holes to accommodate the limiting bolt (301) sliding back and forth along its length direction; both the first bushing (4) and the second bushing (5) are provided with threaded holes that are adapted to the limiting bolt (301) for fixing the limiting bolt (301); the elastic support member (302) is respectively disposed between the first limiting part (101) and the first bushing (4), and between the limiting member (2) and the second bushing (5), and the elastic support member (302) is always in a compressed state.

3. The metering pump rotating shaft safety pin structure according to claim 1, characterized in that, A transverse fracture groove (102) is provided on the outer peripheral wall of the safety pin body (1), and the transverse fracture groove (102) is located at one end of the safety pin body (1) near the contact surface of the first bushing (4) and the second bushing (5). The bottom thickness of the transverse fracture groove (102) is less than the thickness of other parts of the safety pin body (1).

4. The metering pump rotating shaft safety pin structure according to claim 1, characterized in that, A first limiting step (103) is provided at the connection between the safety pin body (1) and the first limiting part (101). The outer diameter of the first limiting step (103) is larger than the outer diameter of the safety pin body (1) and smaller than the outer diameter of the first limiting part (101). The first limiting step (103) abuts against the outer end face of the first bushing (4) during assembly.

5. The metering pump rotating shaft safety pin structure according to claim 1, characterized in that, The limiting member (2) includes a threaded part (201) and a second limiting part (202) fixed to one axial end of the threaded part (201); the end of the safety pin body (1) away from the first limiting part (101) is provided with an internal threaded hole that is adapted to the threaded part (201), and the threaded part (201) is screwed into the internal threaded hole to achieve a detachable connection; the outer diameter of the second limiting part (202) is larger than the outer diameter of the safety pin body (1), and the second limiting part (202) abuts against the outer side wall of the second bushing (5) to achieve axial limiting.

6. The metering pump rotating shaft safety pin structure according to claim 5, characterized in that, A second limiting step (203) is provided at the connection between the threaded part (201) and the second limiting part (202). The outer diameter of the second limiting step (203) is larger than the outer diameter of the threaded part (201) and smaller than the outer diameter of the second limiting part (202). The second limiting step (203) abuts against the outer end face of the second bushing (5) during assembly.

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