Pressure-relief type pressure-sensitive adhesive hot melt adhesive machine

Abstract

The utility model discloses a pressure-relief type pressure-sensitive adhesive hot melting machine which is characterized in that a melting cylinder is arranged on a machine body, an adhesive outlet channel is arranged on a shunting seat, a material pumping mechanism guides molten pressure-sensitive adhesive from the melting cylinder into the adhesive outlet channel, a bottom hole is formed in the melting cylinder, a mounting hole penetrating through a body of the shunting seat is formed in the shunting seat, and the mounting hole is communicated with the bottom hole and the adhesive outlet channel; a pressure relief seat is fixed in a mounting hole and provided with a pressure relief hole which penetrates through a body of the pressure relief seat and is communicated with a bottom hole, a fixing part is mounted on a shunting seat and is positioned below a glue outlet channel, a sealing part is fixed in the middle of an ejector pin, the bottom end of the ejector pin is connected with the fixing part through an elastic part, and the top end of the ejector pin can extend into the pressure relief hole in an up-and-down moving manner. The upper end face of the sealing piece is located below the glue outlet channel. Glue is normally discharged when the ejector pin is located in the pressure relief hole, and hot melt glue fluid is discharged into the melting cylinder for pressure relief when the ejector pin is located outside the pressure relief hole, so that the normal working pressure of the shunting seat is ensured, and the hot melt glue fluid can be recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of hot melt adhesive devices, in particular to a pressure-releasing pressure-sensitive adhesive hot melt adhesive machine. Background Art

[0002] Hot melt adhesive machines are front-end equipment for melting and conveying thermoplastic hot melt adhesives. They provide sufficient melting capacity and flow dynamics for the adhesive, playing a decisive role in both melting efficiency and conveying capacity. Hot melt adhesive machines are commonly used in various industries, including hygiene products, packaging, product assembly, and bookbinding. They can also be used to feed a variety of adhesives, such as pressure-sensitive adhesives.

[0003] In the process of continuous upgrading and updating, hot melt glue machines are gradually developing in the direction of automation, intelligence and multi-function. For example, a hot melt glue machine with a pressure relief function is disclosed in the application number 202321947084.0. It discloses that after the hot melt glue machine is stopped, the hot melt glue expands and contracts, resulting in a pressure difference in the glue barrel. The hot melt glue can be returned to the glue chamber through the return pipe through the cooperation of the return valve, so as to eliminate the pressure difference caused by the expansion and contraction of the hot melt glue and achieve the pressure relief effect. However, it only discloses the pressure relief structure and method after the hot melt glue machine is stopped. In the working state (glue discharging process), the pressure in the glue discharging channel will also be high due to the high pressure of the molten fluid conveying. If the pressure is not relieved, it may cause damage to the relevant components of the hot melt glue machine or create safety hazards. Utility Model Content

[0004] The purpose of the utility model is to provide a pressure-relief type pressure-sensitive adhesive hot melt adhesive machine, wherein when the ejector pin is inserted into the pressure relief hole, the bottom hole of the melting cylinder and the glue outlet channel can be sealed to ensure normal discharge of the pressure-sensitive adhesive fluid; when the fluid pressure in the glue outlet channel is relatively high, the seal is pressed down to drive the ejector pin to separate from the pressure relief hole, so that the bottom hole, the pressure relief hole and the glue outlet channel are connected to discharge the hot melt adhesive fluid into the melting cylinder for pressure relief, thereby ensuring the normal working pressure of the diverter seat and also realizing the recovery of the hot melt adhesive fluid.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pressure-relief type pressure-sensitive adhesive hot melt adhesive machine, comprising a body, a pumping mechanism, a diverter seat and a pressure relief mechanism, the body being provided with a melting cylinder, the diverter seat being provided with a glue outlet channel, the pumping mechanism guiding the molten pressure-sensitive adhesive from the melting cylinder to the glue outlet channel, the melting cylinder being provided with a bottom hole, the diverter seat being provided with a mounting hole penetrating its body, the mounting hole being connected to the bottom hole and the glue outlet channel, the pressure relief mechanism comprising a pressure relief seat, a ejector pin, a sealing member, an elastic member and a fixing member, the pressure relief seat being fixed in the mounting hole at one end near the bottom hole, the pressure relief seat being provided with a pressure relief hole penetrating its body and connected to the bottom hole, the fixing member being installed on the diverter seat and located below the glue outlet channel, a sealing member being fixed to the middle part of the ejector pin, the bottom end of the ejector pin being connected to the fixing member by an elastic member, the top end of the ejector pin being movable up and down and extending into the pressure relief hole, the upper end surface of the sealing member being located below the glue outlet channel.

[0006] As a further optimization, one side of the pressure relief seat extends into the bottom hole.

[0007] As a further optimization, the fixing part includes a base plate, a sleeve and a positioning part. The base plate is arranged on the diverter seat. The sleeve is fixed to the base plate through the positioning part and extends into the mounting hole. The lower part of the elastic part extends into the sleeve and the bottom wall of the sleeve abuts against each other.

[0008] As a further optimization, the positioning piece is a nut arranged on the base plate, and an external thread is provided on the outer wall of the sleeve. The sleeve is threaded onto the nut, and the position of the sleeve can be easily adjusted to adjust the elastic support performance of the elastic piece, which can be suitable for different pressures in the glue outlet channel.

[0009] As a further optimization, the elastic member is a spring.

[0010] As a further optimization, the sealing member includes a pan-seal and a pan-seal fixing seat, the pan-seal fixing seat is arranged in the middle of the ejector pin, and the pan-seal is arranged on the pan-seal fixing seat.

[0011] As a further optimization, a limiting step abutting against the upper end of the sealing member is provided in the mounting hole.

[0012] As a further optimization, the machine body is provided with a pumping cavity connected to the melting cylinder and the glue outlet channel, and the pumping mechanism includes a driving unit and a gear group arranged at the output end of the driving unit. The driving unit is arranged on the machine body, and the gear group is arranged in the pumping cavity.

[0013] As a further optimization, a filter is provided in the pump cavity and / or the glue outlet channel to improve the purity of the pressure-sensitive adhesive fluid.

[0014] As a further optimization, the diverter seat is provided with a drainage hole connected to the glue outlet channel, and a glue discharge valve is provided in the drainage hole. The glue discharge valve can be opened to flush out the waste material, blocking material, etc. remaining or accumulated in the glue outlet channel from the drainage hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By inserting an ejector pin into the pressure relief hole, the bottom hole of the melting cylinder and the glue outlet channel can be sealed to ensure normal discharge of the pressure-sensitive adhesive fluid. When the fluid pressure in the glue outlet channel is high, the fluid presses down on the seal, driving the ejector pin out of the pressure relief hole, connecting the bottom hole, the pressure relief hole, and the glue outlet channel. This allows the hot melt adhesive fluid to be discharged from the glue outlet channel and then into the melting cylinder for pressure relief. This not only ensures the normal working pressure of the diverter seat, but also allows the hot melt adhesive fluid to be recovered.

[0017] 2. By adjusting the position of the sleeve, the elastic support performance of the elastic member can be adjusted to adapt to different fluid pressures in the glue outlet channel, and the amount of hot melt adhesive backflow can be controlled, thereby controlling the amount of hot melt adhesive applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the utility model.

[0019] Figure 2 This is a structural diagram of the utility model after the cover is opened.

[0020] Figure 3 It is a cross-sectional view of the pumping mechanism of the present invention.

[0021] Figure 4 It is a cross-sectional view of the diverter seat and the pressure relief mechanism of the utility model.

[0022] Figure 5 It is a cross-sectional view of the pressure relief mechanism of the present utility model. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figures 1 to 5As shown, a pressure-relief type pressure-sensitive adhesive hot melt adhesive machine includes a machine body 10, a pumping mechanism 30, a diverter seat 40 and a pressure relief mechanism 50. The machine body 10 is provided with a melting cylinder 20, and the diverter seat 40 is provided with a glue outlet channel. The pumping mechanism 30 is arranged on the machine body 10 for guiding the molten pressure-sensitive adhesive from the melting cylinder 20 to the glue outlet channel. Specifically, the glue outlet channel includes a glue inlet hole 401, a flow channel 402 and a glue outlet nozzle 403 connected in sequence. The melting cylinder 20 is provided with a bottom hole 201, and the diverter seat 40 is provided with a mounting hole 404 that runs through its body. The mounting hole 404 connects the bottom hole 201 and the glue outlet channel (specifically, the flow channel 402). The pressure relief mechanism 50 includes a pressure relief seat 51, an ejector pin 5 2. Sealing member 53, fixing member 54 and elastic member 55. The pressure relief seat 51 is fixed to one end of the mounting hole 404 near the bottom hole 201. The pressure relief seat 51 is provided with a pressure relief hole 510 that runs through its body and is connected to the bottom hole 201. The fixing member 54 is installed on the diverter seat 40 and is located below the glue outlet channel (specifically, the flow channel 402). A sealing member 53 is fixed to the middle part of the ejector pin 52. The bottom end of the ejector pin 52 is connected to the fixing member 54 through an elastic member 55. The elastic member 55 can be a spring. The top end of the ejector pin 52 can move up and down to extend into the pressure relief hole 510, and the upper end surface of the sealing member 53 is located below the glue outlet channel (specifically, the flow channel 402).

[0025] In the present invention, a solid pressure-sensitive adhesive is placed in the melting cylinder 20 and is in a molten state under the action of the heating mechanism on the body 10. The fluid enters the glue outlet channel on the diverter seat 40 from the melting cylinder 20 through the action of the pumping mechanism 30, and flows out of the diverter seat through the glue inlet hole 401, the flow channel 402 and the glue outlet nozzle 403 in sequence. When the fluid flows through the flow channel 402, it will also fill the area between the pressure relief seat 51 and the sealing member 53 in the mounting hole 404 and surround the circumference of the ejector pin 52. When the feeding pressure of the fluid in the flow channel 402 is large, the large pressure also acts between the pressure relief seat 51 and the sealing member 53 in the mounting hole 404. When the pressure is greater than the pressure on the ejector pin 52 and the sealing member 53 by the elastic member 55, the elastic member 55 will press the ejector pin 52 and the sealing member 53 together. 3, the fluid compresses the elastic member 55 downward through the seal 53, and the seal 53 and the ejector pin 52 move downward, causing the upper part of the ejector pin 52 to separate from the pressure relief hole 510, thereby connecting the pressure relief hole 510 to the mounting hole 404 and the bottom hole 201. The fluid with a higher pressure in the flow channel 402 and the mounting hole 404 enters the melting cylinder 20 through the pressure relief hole 510, thereby reducing the fluid pressure in the flow channel 402. When the pressure drops to a certain level (the downward pressure of the fluid on the seal 53 is less than the supporting force of the elastic member 55), the elastic member 55 pushes the ejector pin 52 and the seal 53 upward, causing the upper part of the ejector pin 52 to extend into the pressure relief seat in the pressure relief hole 510 to seal the pressure relief seat, and the pressure of the fluid in the flow channel 402 returns to normal.

[0026] The utility model provides an ejector pin 52 extending into the pressure relief hole 510 of the pressure relief seat 51 to seal the bottom hole 201 and the glue outlet channel of the melting cylinder 20, thereby ensuring the normal discharge of the pressure-sensitive adhesive fluid. When the hot melt adhesive fluid with relatively high pressure passes through the glue outlet channel, the downward pressure of the seal 53 can drive the ejector pin 52 to separate from the pressure relief seat 51, so that the bottom hole 201, the pressure relief hole 510 and the glue outlet channel are connected to discharge the hot melt adhesive fluid out of the glue outlet channel and into the melting cylinder 20 for pressure relief, thereby ensuring the normal working pressure of the diverter seat 40 and realizing the recovery of the hot melt adhesive fluid.

[0027] One side of the pressure relief seat 51 extends into the bottom hole 201, which can ensure the installation stability and sealing of the pressure relief seat; a limiting portion or a contraction portion matching the end of the ejector pin 52 is provided in the pressure relief hole 510 to limit the ejector pin 52 to the highest position in the pressure relief hole 510.

[0028] More specifically, the fixing part 54 includes a base plate 541, a sleeve 542 and a positioning part 543. The base plate 541 is arranged on the diverter seat 40. The sleeve 542 is fixed to the base plate 541 by the positioning part 543 and extends into the mounting hole 404. The lower part of the elastic part 55 extends into the sleeve 542 and abuts against the bottom wall of the sleeve 542. It is convenient to install multiple components such as the fixing part 54, the spring 55, the ejector pin 52 and the sealing part 53 in the mounting hole 404, and the length space of the sleeve 542 can accommodate an elastic part (spring) of a certain length with the required compression range to achieve a certain supporting force to adapt to the normal working pressure in the flow channel 402.

[0029] Furthermore, the positioning member 543 is a nut arranged on the base plate 541, and an external thread is provided on the outer wall of the sleeve 542. The sleeve 542 is screwed onto the nut. The sleeve 542 can be rotated to adjust its position on the base plate 541 to adjust the elastic force of the elastic member 55, thereby adjusting it to be suitable for different fluid pressures in the flow channel 402; moreover, the amount of hot melt adhesive backflow can be controlled, thereby controlling the amount of hot melt adhesive applied.

[0030] The specific structure of the sealing member 53 may include a flood seal and a flood seal fixing seat. The flood seal fixing seat is arranged in the middle of the ejector pin, and the flood seal is arranged on the flood seal fixing seat.

[0031] In addition, a limiting step 4041 is provided in the mounting hole 404 and can abut against the upper end of the sealing member 53 , thereby preventing the sealing member 53 from extending upward into the flow channel 402 and affecting its normal pressure-bearing function.

[0032] For example Figure 2 As shown, a cover 11 is provided on the machine body 10 to seal the feeding port of the melting cylinder 20 . The hinged arrangement of the cover 11 not only makes feeding convenient, but also makes it easy to observe the amount of glue in the melting cylinder 20 .

[0033] For example Figure 3 As shown, the machine body 10 is provided with a pumping cavity 301 connected with the melting cylinder 20 and the glue outlet channel (specifically, the glue inlet hole 401). The pumping mechanism 30 includes a driving unit 31 and a gear set 32 ​​arranged at the output end of the driving unit. The driving unit 31 is arranged on the machine body 10, and the gear set 32 ​​is arranged in the pumping cavity 301. The driving unit 31 drives the gear set 32 ​​to drive the pressure-sensitive adhesive fluid from the melting cylinder 20 into the pumping cavity 301, and enters the glue outlet channel (specifically, the glue inlet hole 401) through the glue outlet hole 302 on the pumping cavity 301.

[0034] In order to ensure the purity of the pressure-sensitive adhesive fluid, a filter screen may be provided in the pump cavity 301 ; similarly, a filter screen may also be provided in the adhesive outlet channel.

[0035] For example Figure 4 As shown, the diverter seat 40 is provided with a drain hole connected to the glue outlet channel (specifically, the flow channel 402), and a glue discharge valve 60 is provided in the drain hole. The glue discharge valve 60 can be set next to the filter screen on the diverter seat 40. When the filter screen is seriously blocked due to filtering carbide, the fluid output pressure will be reduced, the flow rate will be reduced, and the glue spraying effect of the spray gun will be affected. In order to extend the service life of the filter screen and reduce the number of cleanings and downtime maintenance time, the drain hole can be opened by loosening the glue discharge valve 60, and the glue pressure of the fluid can be used to flush the dirt and impurities on the surface of the filter screen. The hot melt glue and impurities are mixed and flushed out and discharged under the glue pressure. Repeated flushing can reduce the dirt on the filter screen and allow the fluid to pass smoothly through the glue outlet channel.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A pressure-relief type pressure-sensitive adhesive hot melt adhesive machine, comprising a machine body, a pumping mechanism, and a diverter seat, wherein the machine body is provided with a melting cylinder, the diverter seat is provided with a glue outlet channel, and the pumping mechanism guides the molten pressure-sensitive adhesive from the melting cylinder to the glue outlet channel, characterized in that: It also includes a pressure relief mechanism, the melting cylinder is provided with a bottom hole, the diverter seat is provided with a mounting hole that passes through its body, the mounting hole is connected to the bottom hole and the glue outlet channel, the pressure relief mechanism includes a pressure relief seat, a ejector pin, a sealing member, an elastic member and a fixing member, the pressure relief seat is fixed at one end near the bottom hole in the mounting hole, the pressure relief seat is provided with a pressure relief hole that passes through its body and is connected to the bottom hole, the fixing member is installed on the diverter seat and is located below the glue outlet channel, a sealing member is fixed to the middle of the ejector pin, the bottom end of the ejector pin is connected to the fixing member by an elastic member, and the top end thereof can move up and down to extend into the pressure relief hole, and the upper end surface of the sealing member is located below the glue outlet channel.

2. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 1, characterized in that: One side of the pressure relief seat extends into the bottom hole.

3. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 1, characterized in that: The fixing member includes a base plate, a sleeve and a positioning member. The base plate is arranged on the diverter seat. The sleeve is fixed to the base plate through the positioning member and extends into the mounting hole. The lower part of the elastic member extends into the sleeve and the bottom wall of the sleeve abuts against each other.

4. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 3, characterized in that: The positioning member is a nut arranged on the bottom plate, an outer side wall of the sleeve is provided with an external thread, and the sleeve is threadedly connected to the nut.

5. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 1 or 3, characterized in that: The elastic member is a spring.

6. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 1, characterized in that: The sealing component includes a pan-seal and a pan-seal fixing seat. The pan-seal fixing seat is arranged at the middle part of the ejector pin, and the pan-seal is arranged on the pan-seal fixing seat.

7. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 4 or 6, characterized in that: A limiting step abutting against the upper end of the sealing member is provided in the mounting hole.

8. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 1, characterized in that: The machine body is provided with a pumping cavity connected to the melting cylinder and the glue outlet channel. The pumping mechanism includes a driving unit and a gear set arranged at the output end of the driving unit. The driving unit is arranged on the machine body, and the gear set is arranged in the pumping cavity.

9. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 8, characterized in that: A filter is provided in the pump cavity and / or the glue outlet channel.

10. The pressure-relief pressure-sensitive adhesive hot melt adhesive machine according to claim 8 or 9, characterized in that: The diverter seat is provided with a drain hole connected to the glue outlet channel, and a glue discharge valve is provided in the drain hole.

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