A dual-cylinder alternating glue dispensing device

Abstract

This utility model discloses a dual-cylinder alternating glue dispensing device, relating to the field of glue coating equipment. It aims to solve the problem that glue coating equipment needs to interrupt the coating process for re-applying glue during operation, thus affecting production efficiency and process continuity. The device includes a base, within which multiple sets of heating rods are fixedly connected. A glue tubing network is provided between the heating rods. Two symmetrically distributed glue cylinders are connected to the glue tubing network. Heating wires are fixedly connected to the outside of each glue cylinder, and an insulation cylinder is provided outside the heating wires. The insulation cylinder is fixedly connected to the base. A piston head is slidably connected inside each glue cylinder, and a piston rod is provided on the piston head. A vertically sliding guide slider is fixedly connected to the piston rod. The advantages are: continuous glue dispensing is achieved through the cooperation of the two sets of glue cylinders, the glue tubing network, and the heating rods, and the risk of glue path blockage is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of adhesive coating equipment technology, and in particular to a dual-cylinder alternating adhesive dispensing device. Background Technology

[0002] In the coating, dispensing, or filling of viscous fluids such as butyl rubber and sealants, the continuous glue supply capacity and flow stability of the dispensing equipment are crucial to ensuring production efficiency and product quality. Currently, in relevant industrial production lines, common coating machines or dispensing equipment are typically equipped with a single glue cylinder (or glue bucket, glue storage tank) as the glue source. This traditional structure reveals two main drawbacks in actual operation, severely restricting production efficiency and process continuity, and affecting the quality of the dispensing.

[0003] First, the single glue tank structure necessitates interrupting the coating process for refilling, preventing continuous production. A typical workflow involves pre-loading the glue into the single tank and pumping it to the coating head. When the glue in the tank is nearly depleted, the coating process must stop, requiring manual refilling or auxiliary equipment until the tank is full before restarting. This "stop-refill-restart" cycle creates discontinuities in the production process. For large-scale or high-speed production lines, frequent stoppages for refilling not only directly reduce effective equipment uptime and overall output efficiency but can also lead to quality defects at coating seams (such as uneven glue application), disrupting production rhythm and increasing the complexity of production management and scheduling.

[0004] Secondly, the fluidity of the adhesive decreases significantly at room temperature or lower ambient temperatures, easily leading to adhesive circuit blockage. Materials such as butyl rubber exhibit significant thixotropy and temperature sensitivity; their viscosity increases sharply as temperature decreases. In systems equipped with only a single adhesive tank and lacking effective temperature control, large amounts of adhesive remain in a static storage and working state for extended periods. Especially in northern winters or air-conditioned environments, the adhesive temperature easily drops to room temperature, drastically reducing its fluidity. This increases flow resistance within the delivery pipes, pumps, valves, and coating heads, and can even cause complete solidification, resulting in adhesive circuit blockage. Once blocked, time-consuming cleaning and unblocking are required, also causing production interruptions. Furthermore, viscous and heterogeneous adhesives can also lead to unstable pumping pressure, affecting the uniformity and precision of the final coated or poured adhesive strips. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a dual-cylinder alternating glue dispensing device. This design effectively solves the problem that the glue dispensing equipment needs to interrupt the coating operation for glue replenishment during operation, which affects production efficiency and process continuity.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The present invention includes a base, in which multiple sets of heating rods are fixedly connected, and a rubber tubing network is provided between the multiple sets of heating rods. Two sets of symmetrically distributed rubber cylinders are connected to the rubber tubing network. A heating wire is fixedly connected to the outside of the rubber cylinder, and a heat-insulating cylinder is provided outside the heating wire. The heat-insulating cylinder is fixedly connected to the base. A piston head is slidably connected inside the rubber cylinder, and a piston rod is provided on the piston head. A vertically sliding guide slider is fixedly connected to the piston rod.

[0007] Preferably, the hose network includes a filling hose, which is connected to a distributing hose. Both ends of the distributing hose are connected to a first connecting pipe and a second connecting pipe. The first connecting pipe is connected to the glue cylinder. The two second connecting pipes are connected to a discharging hose. A rotary valve shaft is provided at the junction of the distributing hose, the first connecting pipe, and the second connecting pipe. The rotary valve shaft is rotatably connected to the base. The rotary valve shaft is provided with a T-shaped valve hole.

[0008] Preferably, a pressure measuring tube is connected to the side of the first connecting tube, and the pressure measuring tube is connected to a pressure sensor.

[0009] Preferably, a connecting block is fixedly connected to the cylinder, the connecting block has a through hole for the piston rod to pass through, a drive box is fixedly connected to the connecting block, a column is fixedly connected to the drive box, and a guide groove for the guide slider to slide is provided in the column.

[0010] Preferably, the piston rod is provided with a threaded groove, a flange is threadedly connected to the threaded groove, a connecting gear is fixedly connected to the flange, the connecting gear meshes with a drive gear, and both the drive gear and the connecting gear are rotatably connected to the drive box.

[0011] Preferably, a bearing is rotatably connected inside the flange sleeve, and a fixing nut is fitted below the bearing, with the fixing nut threadedly connected to the flange sleeve.

[0012] Preferably, the connecting block is provided with a viewing window.

[0013] Compared with the prior art, the outstanding advantages of this utility model are: This application features two glue cylinders mounted on the base, allowing for the alternating replacement and dispensing of glue. This eliminates the need to stop downstream coating operations during the glue application process, achieving true continuous production. Simultaneously, the design of the base heating rod and insulation cylinder ensures that the glue maintains excellent flowability throughout the system, fundamentally eliminating the risk of glue path blockage. Attached Figure Description

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

[0015] Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the side cross-sectional structure of the heat insulation cylinder of this utility model.

[0017] Figure 4 This is a cross-sectional structural diagram of the drive box of this utility model.

[0018] Figure 5 This is an exploded view of the flange sleeve of this utility model.

[0019] Figure 6 This is a schematic diagram of the axial structure of the base of this utility model.

[0020] Figure 7 This is a schematic diagram of the cross-sectional structure of the base of this utility model.

[0021] Labels in the diagram: 1. Base; 2. Heating rod; 3. Adhesive hose network; 301. Adhesive filling hose; 302. Adhesive dispensing hose; 303. First connecting pipe; 304. Second connecting pipe; 305. Adhesive outlet pipe; 306. Rotary valve shaft; 307. Valve hole; 308. Pressure measuring pipe; 4. Adhesive cylinder; 5. Insulation cylinder; 6. Piston head; 7. Piston rod; 8. Guide slider; 9. Pressure sensor; 10. Connecting block; 11. Drive box; 12. Column; 13. Guide groove; 14. Threaded groove; 15. Flange sleeve; 16. Connecting gear; 17. Drive gear; 18. Bearing; 19. Fixing nut; 20. Viewing window; 21. Heating wire. Detailed Implementation

[0022] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see the appendix Figure 1-7 This embodiment discloses a dual-cylinder alternating glue dispensing device, comprising a base 1, with multiple sets of heating rods 2 fixedly connected inside the base 1, a glue tube network 3 provided between the multiple sets of heating rods 2, two sets of symmetrically distributed glue cylinders 4 connected to the glue tube network 3, a heat preservation cylinder 5 fixedly connected to the outside of the glue cylinder 4, the heat preservation cylinder 5 being fixedly connected to the base 1, a piston head 6 slidably connected inside the glue cylinder 4, a piston rod 7 provided on the piston head 6, and a vertically sliding guide slider 8 connected to the piston rod 7.

[0024] The base 1 provides a mounting foundation for all components. To achieve constant temperature control of the adhesive, multiple sets of electric heating rods 2 are evenly arranged inside the base 1 (especially in the area accommodating the pipeline). Specifically, there are four heating rods 2, located at the four corners of the base 1. These heating rods 2 can heat the base 1 and maintain the entire adhesive pipeline network 3 arranged therein and the bottom of the adhesive cylinder 4 connected to the adhesive pipeline network 3 at a stable operating temperature higher than the ambient temperature (for example, for butyl rubber, it can be maintained at 100-150℃) through heat conduction. This effectively reduces the viscosity of the adhesive and prevents it from solidifying and clogging due to temperature drop.

[0025] The glue supply system above the base 1 adopts a dual glue cylinder 4 design. The two glue cylinders 4 are arranged symmetrically, and each is fitted with an insulation cylinder 5 that maintains a certain gap with its outer wall. The insulation cylinder 5 can be filled with heat insulation materials such as heat insulation cotton. Its bottom is fixedly connected to the base 1, and its top is sealed to the glue cylinder 4 through a flange structure, together forming a good heat insulation cavity. In conjunction with the heating function of the base 1, it minimizes the heat loss of the glue liquid. At the same time, the glue cylinder surface is equipped with heating wires to provide additional heating to the glue cylinder.

[0026] Each glue cylinder 4 is equipped with a piston head 6 that can slide up and down along its inner wall. The piston head 6 is connected to the drive mechanism above via a piston rod 7. The piston head 6 has a sealing ring on its edge to ensure a tight seal with the inner wall of the glue cylinder 4. When the piston head 6 moves downward under the drive, it applies a stable pressure to the glue in the glue cylinder 4, forcing it to be discharged; when it moves upward, it either draws in glue or provides space for glue replenishment.

[0027] Please combine Figure 2 , Figure 6 and Figure 7 The glue hose network 3 is crucial for achieving dual-cylinder switching and continuous glue supply. It includes a replenishment hose 301 for introducing glue from an external glue supply system (such as a large storage tank). The replenishment hose 301 connects to the middle of a distribution hose 302. Each end of the distribution hose 302 branches into two lines: one is a first connecting hose 303, which directly connects to the bottom of the corresponding glue cylinder 4; the other is a second connecting hose 304. The two second connecting hoses 304 eventually converge and connect to a main glue outlet hose 305, which delivers the glue to the downstream coating head or glue gun.

[0028] At the tee junction where the dispensing pipe 302 intersects with the first connecting pipe 303 and the second connecting pipe 304, a rotary valve shaft 306 is provided. This rotary valve shaft 306 is horizontally mounted on the base 1 and can be driven to rotate by a small stepper motor or a manual wrench. The rotary valve shaft rotates 90 degrees at a time. Figure 7As shown, a T-shaped through valve hole 307 is machined at the center of the rotary valve shaft 306. By rotating the valve shaft 306 (for example, rotating it 90 degrees each time), the correspondence between the three ports of the T-shaped valve hole 307 and the dispensing pipe 302, the first connecting pipe 303, and the second connecting pipe 304 can be changed, thereby achieving the switching between the following two working flow paths: Position A (Refill Position): The L-shaped passage of the "T"-shaped valve hole 307 connects the refill pipe 301 and the first connecting pipe 303, while simultaneously closing the second connecting pipe 304. At this time, external adhesive can enter the corresponding glue cylinder 4 for refilling through the refill pipe 301 and the first connecting pipe 303, while the glue supply of the glue outlet pipe 305 is independently maintained by another glue cylinder 4.

[0029] Position B (glue outlet): The vertical passage of the "T"-shaped valve hole 307 connects the first connecting pipe 303 and the second connecting pipe 304, while simultaneously closing the glue distribution pipe 302. At this time, the glue in the glue cylinder 4 on this side flows through the first connecting pipe 303 and the second connecting pipe 304 to the glue outlet pipe 305 under the piston pressure, participating in glue supply.

[0030] To ensure the working pressure inside the glue outlet, a pressure measuring tube 308 is connected to the side wall of each first connecting tube 303. The pressure measuring tube 308 is connected to a pressure sensor 9 embedded in the base 1, which is used to monitor the outlet pressure of the glue cylinder 4 in real time, provide feedback for drive control, and can alarm when the pressure is abnormal. It ensures the pressure of glue dispensing when dispensing glue and ensures the pressure inside the glue cylinder when replenishing glue.

[0031] Please see Figure 4 and Figure 5 A connecting block 10 is fixedly connected to the upper flange of the insulation cylinder 5. The connecting block 10 has a through hole that allows the piston rod 7 to pass through. A drive box 11 is fixedly installed above the connecting block 10. A column 12 extends upward from the top of the drive box 11, and a vertical guide groove 13 is machined on the inner side of the column 12.

[0032] The upper end of the piston rod 7 is connected to a guide slider 8. The two side flanges of the guide slider 8 are precisely embedded in the guide groove 13 of the column 12, ensuring that the piston rod 7 and piston head 6 can only move in a strictly vertical direction without radial oscillation, thereby improving the life of the seal and the stability of the dispensing pressure.

[0033] The drive system employs a combination of helical and gear drives. The upper section of the piston rod 7 is machined with external threads (threaded groove 14). The flange sleeve 15 engages with this threaded groove 14 via its internal threads. A connecting gear 16 is mounted above the flange sleeve step. The connecting gear has four holes, and is secured to the flange sleeve via these holes and fixing bolts (or by welding or other methods). A drive gear 17 meshes with the connecting gear 16 and is driven by a motor installed in the drive housing 11. Inside the flange sleeve 15, two bearings 18 are installed above the threads: one is a thrust bearing, and the other is a radial bearing. Their purpose is to withstand the axial force generated when the piston is pressed down. Below the bearings 18, a fixing nut 19, which engages with the internal threads of the flange sleeve 15, provides axial positioning and preload adjustment.

[0034] During operation, the motor drives the drive gear 17 to rotate, which in turn drives the meshing connecting gear 16 and flange sleeve 15 to rotate. Since the piston rod 7 is restricted from rotating by the guide slider 8, the rotational motion of the flange sleeve 15 is converted into the linear lifting motion of the piston rod 7 and piston head 6 through the rotational motion of the threaded engagement. By controlling the direction and angle of the motor, the stroke and speed of the piston head 6 can be precisely controlled, thereby achieving a stable and adjustable dispensing flow rate and pressure.

[0035] In addition, a viewing window 20 (such as a pressure-resistant glass observation window) is provided on the side wall of the connecting block 10, so that the operator can intuitively observe the remaining amount of glue in the glue cylinder 4 and the approximate position of the piston head 6, which is convenient for judging the timing of glue replenishment and the status of the equipment.

[0036] The working principle and beneficial effects of this invention are as follows: When the equipment is working, by switching the rotary valve shaft 306, one of the glue cylinders 4 is in the "glue dispensing position," and its piston head 6 is pressed down under the action of the drive mechanism, stably pressurizing the constant-temperature glue liquid to the glue dispensing pipe 305. At the same time, the other glue cylinder 4 can be switched to the "glue replenishment position," and glue liquid is replenished from the outside through the glue replenishment pipe 301. When the glue liquid in the working glue cylinder 4 is about to run out, the state of the rotary valve shaft 306 is quickly switched, so that the glue cylinder 4 that has just been replenished takes over the glue supply, while the original working cylinder becomes the glue replenishment cylinder. This process can be completed instantly without stopping the downstream coating operation, realizing true continuous production. At the same time, the design of the heating base 1 and the heat preservation cylinder 5 ensures that the glue liquid maintains good fluidity throughout the system, fundamentally eliminating the risk of glue circuit blockage. The precise guidance and transmission of the piston drive mechanism ensures the constant glue dispensing pressure and improves the coating quality. The overall equipment has a compact structure, a high degree of automation, and significantly improves production efficiency and process stability.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-cylinder alternating glue dispensing device, characterized in that: Includes a base (1), in which multiple sets of heating rods (2) are fixedly connected, and a hose mesh (3) is provided between the multiple sets of heating rods (2). Two sets of symmetrically distributed hose cylinders (4) are connected to the hose mesh (3). A heating wire (21) is fixedly connected to the outside of the hose cylinder (4). A heat insulation cylinder (5) is provided outside the heating wire (21). The heat insulation cylinder (5) is fixedly connected to the base (1). A piston head (6) is slidably connected inside the hose cylinder (4). A piston rod (7) is provided on the piston head (6). A vertically sliding guide slider (8) is fixedly connected to the piston rod (7).

2. The dual-cylinder alternating glue dispensing device according to claim 1, characterized in that: The hose network (3) includes a filling hose (301), which is connected to a distributing hose (302). Both ends of the distributing hose (302) are connected to a first connecting pipe (303) and a second connecting pipe (304). The first connecting pipe (303) is connected to the glue cylinder (4), and the two second connecting pipes (304) are connected to a discharging hose (305). A rotary valve shaft (306) is provided at the junction of the distributing hose (302), the first connecting pipe (303), and the second connecting pipe (304). The rotary valve shaft (306) is rotatably connected to the base (1), and a T-shaped valve hole (307) is provided on the rotary valve shaft (306).

3. The dual-cylinder alternating glue dispensing device according to claim 2, characterized in that: The first connecting pipe (303) is connected to a pressure measuring pipe (308) on its side, and the pressure measuring pipe (308) is connected to a pressure sensor (9).

4. The dual-cylinder alternating glue dispensing device according to claim 1, characterized in that: A connecting block (10) is fixedly connected to the rubber cylinder (4). The connecting block (10) has a through hole for the piston rod (7) to pass through. A drive box (11) is fixedly connected to the connecting block (10). A column (12) is fixedly connected to the drive box (11). A guide groove (13) is provided in the column (12) for the guide slider (8) to slide.

5. The dual-cylinder alternating glue dispensing device according to claim 4, characterized in that: The piston rod (7) is provided with a threaded groove (14), and a flange sleeve (15) is threadedly connected to the threaded groove (14). A connecting gear (16) is fixedly connected to the flange sleeve (15), and a drive gear (17) is meshed with the connecting gear (16). Both the drive gear (17) and the connecting gear (16) are rotatably connected to the drive box (11).

6. The dual-cylinder alternating glue dispensing device according to claim 5, characterized in that: A bearing (18) is rotatably connected inside the flange sleeve (15), and a fixing nut (19) is fitted below the bearing (18). The fixing nut (19) is threadedly connected to the flange sleeve (15).

7. The dual-cylinder alternating glue dispensing device according to claim 4, characterized in that: The connecting block (10) is provided with a viewing window (20).

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