A polyurethane needle sleeve dispensing device

Abstract

This invention provides a polyurethane needle sleeve dispensing device, including a mounting plate, multiple dispensing heads, and a distributor. The input end of the distributor is connected to a mixing tank via a pump body, and the output end is connected to each dispensing head via independent pipes. Internally, it features a tapered main channel and multiple branch channels. The diameter of the main channel gradually increases along the flow direction to compensate for flow pressure attenuation. Each branch channel output is equipped with an independent ball valve to support precise control of the single-point dispensing volume. The branch channels are connected to the dispensing heads via quick-change connectors, enabling rapid replacement of clogged components. A sliding groove on the side of the mounting plate engages with a slider, and bolts are used to adjust the lateral spacing of the dispensing heads to adapt to different needle sleeve layouts. The distributor is externally equipped with a heating jacket and a temperature sensor, and a controller dynamically maintains the optimal viscosity of the polyurethane. The device is configured with 3-6 synchronous dispensing heads, improving production efficiency compared to traditional single-head equipment while avoiding abnormal colloid curing, meeting the precision dispensing requirements of medical devices.

Description

Technical Field

[0001] This utility model relates to the field of medical device manufacturing and processing equipment technology, and in particular, it designs a polyurethane needle sleeve potting device. Background Technology

[0002] A polyurethane needle sleeve dispensing device is a specialized instrument for precisely injecting liquid polyurethane material into the inside of a needle sleeve. Its core function is to ensure uniform filling of the needle sleeve by precisely controlling the dispensing process, followed by curing. The polyurethane can penetrate into micropores, forming a gapless sealing layer after curing, completely blocking leakage paths. Simultaneously, it forms an "elastic damping layer" to protect the internal needle structure. However, existing dispensing devices, such as those shown in CN115178429A, all use a single dispensing needle for stable dispensing; however, a single dispensing needle limits the productivity of a single device.

[0003] Therefore, it is necessary to develop a polyurethane needle sleeve dispensing device to improve production efficiency while maintaining a stable dispensing volume. In addition, utility model patents with publication numbers CN222783198U and CN222783196U provide several quick-change connectors. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a polyurethane needle sleeve dispensing device with stable dispensing and multiple dispensing needles.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A polyurethane needle sleeve dispensing device includes a mounting plate. Multiple dispensing heads are arranged on the side of the mounting plate. The input ends of the multiple dispensing heads are independently connected to the output end of a distributor via pipes. The input end of the distributor is connected to a mixing tank via a pump body. The distributor includes a main channel and branch channels. Each branch channel has an independently arranged valve at its output end. The main channel has a tapered cross-section, and its diameter gradually increases along the flow direction. The branch channels are detachably connected to the dispensing heads.

[0006] Furthermore, the main channel is arranged horizontally, and the main channel is connected to each branch channel in sequence along the flow direction.

[0007] Furthermore, the mounting plate has a horizontally opened groove on its side, and an elongated hole is provided through the groove. The distribution channel is connected to the dispensing head through a hose. Multiple dispensing heads are independently fixed on sliders that are adapted to the groove. The contact surface between the slider and the groove is provided with a threaded hole, and a bolt is provided that passes through the elongated hole and is connected to the threaded hole.

[0008] Furthermore, a quick-change connector is provided between the end of the distribution channel and the dispensing head.

[0009] Furthermore, a connecting plate extends laterally from the top of the mounting plate, and the connecting plate is vertically provided with at least two sliding sleeves. Each sliding sleeve is rotatably connected to the end of a screw. An adjusting plate is sleeved on the screw, and an adjusting handle is provided at the end of the screw away from the sliding sleeve and the adjusting plate.

[0010] Furthermore, the valve of the diversion channel is a ball valve, which is located on the side of the dispensing head away from the quick-change connector and the diverter.

[0011] Furthermore, the shunt is fitted with a heating jacket, and a resistance wire is installed inside the heating jacket. The resistance wire is electrically connected to the controller, and the controller is also electrically connected to a temperature sensor. The input end of the temperature sensor is in close contact with the side wall of the shunt.

[0012] Furthermore, the diversion channel and the corresponding dispensing head are provided in 3-6 parts.

[0013] The advantages and beneficial effects of this utility model are as follows: The dispensing device uses a tapered structure with a gradually increasing cross-section of the main channel to avoid insufficient dispensing volume at the end dispensing head due to pressure attenuation. Each branch channel is equipped with an independent ball valve at the end, allowing for individual flow rate adjustment for different needle sleeve specifications. Quick-change connectors support rapid replacement of clogged or worn dispensing heads, reducing downtime. The dispensing head is laterally adjustable via grooves and sliders to accommodate needle sleeve layouts with different spacing. Simultaneous dispensing of 3-6 branch channels improves production efficiency compared to traditional single-head dispensing equipment. An external resistance wire heating jacket on the distributor, along with a temperature sensor and controller, provides closed-loop temperature control of the distributor, preventing low temperatures from causing an increase in polyurethane viscosity or high temperatures from triggering pre-curing issues. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the shunt of this utility model;

[0016] Figure label:

[0017] 1-Mounting plate, 2-Dispensing head, 3-Diverter, 4-Main channel, 5-Diverter channel, 6-Ball valve, 7-Slide groove, 8-Long hole, 9-Bolt, 10-Quick-change connector, 11-Sliding sleeve, 12-Screw, 13-Adjusting plate, 14-Adjusting handle, 15-Heating jacket, 16-Temperature sensor. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0019] Example 1

[0020] A polyurethane needle sleeve dispensing device includes a mounting plate 1, on the side of which six dispensing heads 2 are provided; the input ends of the dispensing heads 2 are independently connected to the output end of a distributor 3 via hoses; the input end of the distributor 3 is connected to a mixing tank via a pump body; the distributor 3 includes a main channel 4 and branch channels 5, and each branch channel 5 is independently provided with a ball valve 6 at its output end; the main channel 4 is horizontally arranged, and its cross-section is a tapered structure with a length of 15cm, with its diameter linearly increasing from 5mm at the inlet end to 10mm at the end along the flow direction; the branch channels 5 are detachably connected to the hoses via threaded interfaces, and are sequentially perpendicularly connected to the four branch channels 5 along the flow direction.

[0021] Example 2

[0022] A polyurethane needle sleeve dispensing device differs from Embodiment 1 in that the mounting plate 1 has a horizontally opened groove 7 on its side, and an elongated hole 8 is provided through the side of the groove 7; six dispensing heads 2 are independently fixed on sliders that are adapted to the groove 7, and the bottom of the sliders has threaded holes; the sliders and grooves 7 are locked and positioned by bolts 9 passing through the elongated holes 8, and the spacing between the dispensing heads 2 is adjustable in the range of 20-50mm. A connecting plate extends horizontally from the top of the mounting plate 1; the connecting plate has two vertically arranged sliding sleeves 11; each sliding sleeve 11 is rotatably connected to the end of a screw 12 through an embedded bearing; an adjusting plate 13 is sleeved on the screw 12, and an adjusting handle 14 is provided at the end of the screw 12 away from the sliding sleeve 11 and the adjusting plate 13. Rotating both adjusting handles 14 at the same time can move the entire dispensing device up and down.

[0023] Example 3

[0024] A polyurethane needle sleeve potting device differs from Embodiment 2 in that the outer wall of the shunt 3 is covered with a silicone heating sleeve 15, and a nickel-chromium resistance wire is embedded in the heating sleeve 15. The resistance wire is connected to a DC power supply through a controller, and the controller is also electrically connected to a thermocouple as a temperature sensor 16. The probe of the temperature sensor 16 is tightly attached to the side wall of the shunt 3 through thermally conductive adhesive to form a closed-loop temperature control system.

[0025] The working principle of this invention is as follows: The adjusting plate is fixed to the production line support with bolts. The height of the device is set by rotating the adjusting handle. After adjusting the entire device to a suitable height, the corresponding number of diversion ball valves can be opened sequentially from the end with the larger diameter of the conical main channel for dispensing glue, according to actual production conditions. When dealing with dispensing needle sleeves of different specifications, the distance between the dispensing heads can be adjusted by tightening the bolts through the grooves and elongated holes. Before formal production, the dispensing volume of the device is pre-adjusted by dispensing a sample of each dispensing head and then adjusting the ball valve of the corresponding dispensing head to ensure that the positive and negative range of the dispensing heads obtained in one dispensing is within the allowable error range. The temperature sensor and controller adjust the temperature of the diversion device to 40±2℃.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A polyurethane needle hub filling device comprising a mounting plate (1) characterised in that: The mounting plate (1) has multiple dispensing heads (2) on its side; the input ends of the multiple dispensing heads (2) are independently connected to the output end of the distributor (3) through pipes; the input end of the distributor (3) is connected to the mixing tank through the pump body; the distributor (3) includes a main channel (4) and a branch channel (5), and each branch channel (5) has an independent valve at its output end; the main channel (4) has a tapered cross-section, and its diameter gradually increases along the flow direction; the branch channel (5) is detachably connected to the dispensing head (2).

2. The polyurethane barrel filling device of claim 1, wherein: The main channel (4) is arranged horizontally and is connected to each branch channel (5) in sequence along the flow direction.

3. The polyurethane barrel filling device of claim 2, wherein: The diversion channel (5) is connected to the dispensing head (2) via a hose. The mounting plate (1) has a horizontal groove (7) on its side. The groove (7) has a through hole (8). Multiple dispensing heads (2) are independently fixed on sliders that are adapted to the groove (7). The contact surface between the slider and the groove (7) is provided with a threaded hole. A bolt (9) is provided through the through hole (8) and connected to the threaded hole.

4. The polyurethane barrel filling device of claim 3, wherein: A quick-change connector (10) is provided between the end of the diversion channel (5) and the dispensing head (2).

5. The polyurethane barrel filling device according to any one of claims 1 to 4, wherein: A connecting plate extends laterally from the top of the mounting plate (1); the connecting plate is vertically provided with at least two sliding sleeves (11); each sliding sleeve (11) is rotatably connected to the end of a screw (12); the screw (12) is fitted with an adjusting plate (13), and an adjusting handle (14) is provided at the end of the screw (12) away from the sliding sleeve (11) and the adjusting plate (13).

6. The polyurethane needle sleeve dispensing device according to any one of claims 1-4, characterized in that: The valve of the diversion channel (5) is a ball valve (6), which is located on the side of the dispensing head (2) away from the quick-change connector (10) and the diverter (3).

7. The polyurethane needle sleeve dispensing device according to any one of claims 1-4, characterized in that: The shunt (3) is covered with a heating sleeve (15); a resistance wire is provided inside the heating sleeve (15), and the resistance wire is electrically connected to the controller; the controller is also electrically connected to a temperature sensor (16), and the input end of the temperature sensor (16) is close to the side wall of the shunt (3).

8. The polyurethane needle sleeve dispensing device according to any one of claims 1-4, characterized in that: The number of the distribution channels (5) and the matching dispensing heads (2) is 3-6.

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