Chemical liquid filling anti-loosening device

Abstract

This utility model belongs to the field of chemical filling technology, specifically disclosing a chemical liquid filling anti-loosening device, including an input pipe and an output pipe connected by a connector; one end of the connector is threaded to the input pipe, and the outer surface of the other end is connected to a locking pin by a pin. The locking pin has an arc-shaped pin head and a pin rod, with the arc-shaped pin head located inside the connector to press the output pipe; a limiting sleeve is fitted on the input pipe, and the limiting sleeve has a groove that mates with the pin rod. A locking nut is also provided on the side of the limiting sleeve away from the connector, and the locking nut is threaded to the input pipe. By tightening it, the limiting sleeve is pushed to press the pin rod. Through the primary locking of the locking pin and the groove on the limiting sleeve, and the secondary locking of the locking nut and the limiting sleeve, the output pipe and the connector are firmly coupled, significantly reducing the impact of vibration and instantaneous impact on the connection. At the same time, the axial compression of the limiting sleeve and the locking nut can resist the lateral impact of forklifts, loading arms, and personnel on site, improving the overall safety of chemical liquid filling operations.

Description

Technical Field

[0001] This utility model belongs to the field of chemical filling technology, specifically relating to a chemical liquid filling anti-loosening device. Background Technology

[0002] In the petrochemical industry, D-type conventional snap-fit ​​quick couplings are commonly used for filling liquid products in tank trucks, railway tank cars, and IBC containers. This coupling uses a pair of symmetrically arranged pull lugs to engage with corresponding slots on the tank interface, completing the connection in seconds. It is suitable for loading and unloading oil, water, gas, and all other fluid media. Typical applications include the bulk filling of hazardous chemicals such as liquid ammonia, methanol, carbon dioxide, liquefied petroleum gas, and acid / alkali solutions.

[0003] However, conventional fasteners rely solely on a single-point contact between the pull lug and the slot for locking, lacking a secondary locking mechanism. During the liquid filling process, they are easily affected by the continuous vibration and instantaneous impact generated by the start-up and shutdown of the tank truck's engine and pumps, as well as valve throttling, which can lead to loosening of the joint. At the same time, with forklifts, loading arms, and personnel frequently moving around the filling site, if there is a lateral impact or if the operator fails to press the pull lug into place, the joint will disengage, causing a safety accident. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model designs a chemical liquid filling anti-loosening device to achieve connection stability during chemical liquid filling, avoid joint loosening, and reduce the occurrence of safety accidents.

[0005] This utility model relates to a chemical liquid filling anti-loosening device, which includes an input pipe and an output pipe connected by a connector. One end of the connector is threaded to the input pipe, and the outer surface of the other end is connected to a retaining pin by a pin. The retaining pin has an arc-shaped pin head and a pin rod. The arc-shaped pin head is located inside the connector to press the output pipe. A limiting sleeve is fitted onto the input pipe. The limiting sleeve has a groove that mates with the pin. A locking nut is also provided on the side of the limiting sleeve away from the connector. The locking nut is threaded onto the input pipe and is tightened to push the limiting sleeve to press the pin.

[0006] The outer surface of the connector is provided with a connecting seat, the pin passes through the connecting seat, one end of the pin is fixed with a positioning pin, the positioning pin passes through a through hole opened on the locking pin, and the other end of the pin is threaded with a nut.

[0007] A spring is also fitted onto the pin, and the spring is located between the nut and the connecting seat.

[0008] The input pipe is also threaded with a back cap, which is located on the side of the locking nut away from the limiting sleeve.

[0009] The beneficial effects of this utility model are: Compared with existing technologies, this utility model uses a double-locking structure—a primary locking mechanism with a locking pin and a groove on the limiting sleeve, and a secondary locking mechanism with a locking nut and the limiting sleeve—to firmly couple the output pipe and the connector. This significantly reduces the impact of continuous vibrations and instantaneous impacts from engine and pump start-ups and valve throttling on the connection. At the same time, the axial compression of the limiting sleeve and the locking nut can resist lateral impacts from forklifts, loading arms, and personnel on site, preventing disengagement due to improper clamping by the operator. Ultimately, this effectively avoids loosening of the connector and the resulting safety accidents, improving the overall safety of chemical liquid filling operations. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments are briefly introduced below.

[0011] Figure 1 This is a schematic diagram of the overall structure of the anti-loosening device in the embodiment.

[0012] Figure 2 This is a schematic diagram of an explosion involving the anti-loosening device in the embodiment.

[0013] Figure 3 This is a schematic diagram of the connector structure for installing the anti-loosening device in the embodiment.

[0014] Figure 4 This is a cross-sectional view of the joint in the embodiment where the anti-loosening device is installed.

[0015] Figure 5 This is a schematic diagram of the locking pin structure for the anti-loosening device in the embodiment.

[0016] In the attached diagram, the structural names represented by each number are as follows: 1-Output tube, 2-Connector, 3-Limit sleeve, 301-Slot, 4-Locking nut, 5-Input tube, 6-Back cap, 7-Connecting seat, 8-Snap pin, 801-Arc-shaped pin head, 802-Pin rod, 803-Through hole, 9-Pin, 10-Spring, 11-Positioning pin, 12-Nut. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Example 1 See Figures 1 to 4 As shown, a chemical liquid filling anti-loosening device is provided, which mainly includes an output pipe 1, a connector 2, an input pipe 5, and a limiting sleeve 3 and a locking nut 4 arranged sequentially from left to right on the input pipe 5.

[0019] The upstream end of the input pipe 5 is connected to a filling pump or process pipeline, and the downstream end of the output pipe 1 is connected to the tank opening of a tank car, railway tank car, or IBC tonne container; the two pipes are coupled together through a connector 2. The locking pin 8 is installed on the outer surface of the connector 2 by a pin 9, and its arc-shaped pin head 801 extends into the interior of the connector 2 to press the output pipe 1; the limiting sleeve 3 is fitted on the input pipe 5 and has a locking groove 301 that mates with the pin rod 802 of the locking pin 8; the locking nut 4 is threaded onto the input pipe 5 and is located on the side of the limiting sleeve 3 away from the connector 2, and is used to push the limiting sleeve 3 to press the pin rod 802.

[0020] Specifically, one end of the connector 2 has an internal thread on its inner wall, which is connected and sealed with the external thread on the outer wall of the input pipe 5; the other end of the connector 2 is a socket end, which is used to accommodate the end of the output pipe 1. A pair of radially symmetrical connecting seats 7 are welded to the outer circumferential surface of the socket end. The connecting seats 7 are machined with coaxial holes for inserting pins 9, which can slide axially within the connecting seats 7.

[0021] Pin 9 is connected to locking pin 8, which is a one-piece forged part consisting of an arc-shaped pin head 801 and a pin rod 802. The arc-shaped pin head 801 is outwardly convex and fan-shaped to press the output pipe 1.

[0022] See Figure 5 As shown, one end of the pin 9 is provided with a positioning pin 11, which is L-shaped. One end is fixed to the pin 9, and the other end passes through the through hole 803 on the locking pin 8 to limit the rotation of the locking pin 8. The other end of the pin 9 is threadedly connected to a nut 12. A spring 10 is provided between the nut 12 and the connecting seat 7 to provide a certain preload and prevent the pin 9 from loosening accidentally.

[0023] The limiting sleeve 3 is slidably fitted onto the input pipe 5, and its inner side has a groove 301 that can engage with the pin 802 of the locking pin 8. The locking nut 4 is threaded onto the input pipe 5 and is located on the side of the limiting sleeve 3 away from the connector 2. By tightening the locking nut 4, the limiting sleeve 3 can be pushed towards the connector 2, thereby pressing the pin 802 and achieving axial fixation of the locking pin 8. To further enhance the locking reliability, a back cap 6 is also provided on the input pipe 5. The back cap 6 is located on the side of the locking nut 4 away from the limiting sleeve 3 and forms an opposing structure with the locking nut 4 to prevent the locking nut 4 from loosening in a vibration environment.

[0024] Work process: During filling, the input pipe 5 is threaded to one end of the connector 2, and the output pipe 1 is inserted into the other end of the connector 2. The locking pin 8 is rotated so that its arc-shaped pin head 801 presses against the output pipe 1. Then, the positioning pin 11 is inserted into the through hole 803 of the locking pin 8 to restrict its rotation. The nut 12 is then tightened to compress the spring 10, further fixing the position of the pin 9. Finally, the limiting sleeve 3 is slid along the input pipe 5 so that its groove 301 engages with the pin 802. The locking nut 4 (and the back cap 6) is then tightened to push the limiting sleeve 3 against the pin 802, completing the double locking, allowing for chemical liquid filling. Continuous or momentary mechanical vibration is initially absorbed by the radial pressure of the arc-shaped pin head 801 on the output pipe 1. If a lateral impact or accidental contact occurs, the limiting sleeve 3 and the pin 802, combined with the axial pressure of the locking nut 4, prevent the locking pin 8 from rotating and the connector 2 from loosening, thus significantly improving the safety of the filling operation. Disassembly is performed by reversing the operation.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not describe all details exhaustively, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification.

Claims

1. A chemical liquid filling anti-loosening device, comprising an input pipe (5) and an output pipe (1) connected by a joint (2), characterized in that, One end of the connector (2) is threaded to the input pipe (5), and the outer surface of the other end is connected to the locking pin (8) by a pin (9). The locking pin (8) has an arc-shaped pin head (801) and a pin rod (802). The arc-shaped pin head (801) is located inside the connector (2) to press the output pipe (1). The input pipe (5) is fitted with a limiting sleeve (3), the limiting sleeve (3) is provided with a groove (301) that cooperates with the pin (802), and a locking nut (4) is also provided on the side of the limiting sleeve (3) away from the connector (2). The locking nut (4) is threadedly connected to the input pipe (5) and is tightened to push the limiting sleeve (3) to press the pin (802).

2. The chemical liquid anti-loosening device according to claim 1, characterized by The outer surface of the connector (2) is provided with a connecting seat (7), the pin (9) passes through the connecting seat (7), one end of the pin (9) is fixed with a positioning pin (11), the positioning pin (11) passes through the through hole (803) opened on the locking pin (8), and the other end of the pin (9) is threaded with a nut (12).

3. The chemical liquid anti-loosening device according to claim 2, characterized by A spring (10) is also fitted on the pin (9), and the spring (10) is located between the nut (12) and the connecting seat (7).

4. The chemical liquid anti-loosening device according to claim 1, characterized by The input pipe (5) is also threaded with a back cap (6), which is located on the side of the locking nut (4) away from the limiting sleeve (3).

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