Hot melt adhesive valve

Abstract

The hot melt adhesive valve comprises a valve body, a nozzle, a stroke nut and a sliding rod, a first material cavity and an air cavity are formed in the valve body, a feeding port and a discharging port which are communicated with the first material cavity are formed in the valve body, a first air inlet and a second air inlet are formed in the valve body, a second material cavity is formed in the nozzle, and the nozzle is detachably connected with the valve body. The stroke nut is connected with the valve body in a matched mode, the sliding rod penetrates through the valve body and the stroke nut and is in sliding connection with the valve body and the stroke nut, a plug is fixedly connected to one end of the sliding rod, a piston is fixedly connected to the middle of the sliding rod and divides the air cavity into a first cavity body and a second cavity body, and the first air inlet and the second air inlet are communicated with the first cavity body and the second cavity body respectively. The other end of the sliding rod is fixedly connected with a limiting nut, and a certain distance is reserved between the limiting nut and the stroke nut. According to the hot melt adhesive valve provided by the utility model, the opening and closing degree of the plug is adjusted by rotating the stroke nut, so that the adhesive outlet amount is adjusted in the spraying process.

Description

Technical Field

[0001] This utility model relates to the field of glue valve flow control, and in particular to a hot melt glue valve. Background Technology

[0002] In the hot melt adhesive coating process, the hot melt adhesive valve is the core component for controlling the adhesive flow rate. Its dispensing accuracy directly affects the coating uniformity and material utilization. Existing technology mainly adjusts the dispensing amount by changing the nozzle with different orifice sizes. For example, when it is necessary to increase the amount of adhesive, the worker needs to stop the machine, disassemble the original nozzle, and replace it with a larger orifice nozzle. If it is necessary to reduce the amount of adhesive, a smaller orifice nozzle needs to be replaced.

[0003] However, during the spraying process, workers cannot adjust the amount of adhesive dispensed in real time using the aforementioned hot melt adhesive valve. For example, if the production line speed suddenly changes or the adhesive layer is found to be too thick or too thin, the amount of adhesive cannot be corrected immediately by adjusting the nozzle size. The machine must be stopped and the nozzle replaced, which reduces production efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a hot melt adhesive valve that allows for adjustment of the adhesive dispensing amount during the spraying process by rotating the stroke nut to adjust the opening and closing size of the plug.

[0005] The technical solution adopted by the hot melt adhesive valve disclosed in this utility model is:

[0006] The device includes a valve body, a nozzle, a stroke nut, and a slide rod. The valve body has a first material chamber and an air chamber. The valve body has an inlet and a outlet communicating with the first material chamber. The valve body also has a first air inlet and a second air inlet. The nozzle has a second material chamber. The nozzle is detachably connected to the valve body. The second material chamber communicates with the outlet and the nozzle nozzle orifice. The stroke nut is fitted to the valve body. The slide rod passes through the valve body and the stroke nut, and is slidably connected to them. One end of the slide rod is fixedly connected to a plug located in the second material chamber, touching the outlet. A piston is fixedly connected to the middle of the slide rod, dividing the air chamber into a first chamber and a second chamber. The first air inlet and the second air inlet communicate with the first and second chambers, respectively. The other end of the slide rod is fixedly connected to a limit nut, which is spaced a certain distance from the stroke nut.

[0007] As a preferred embodiment, the valve body is covered with a first sealing cover and a second sealing cover at both ends, the discharge port is located on the first sealing cover, the first sealing cover is placed on the first material chamber, the first sealing cover is located between the nozzle and the valve body, the slide rod passes through the second sealing cover, the second sealing cover is placed on the air chamber, and the stroke nut is connected to the second sealing cover.

[0008] As a preferred embodiment, a valve ring is installed on the first sealing cover, the discharge port is located inside the valve ring, and the plug touches the valve ring.

[0009] As a preferred embodiment, the second sealing cover has a threaded hole, and the outer side of the stroke nut has an external thread, which engages with the threaded hole of the second sealing cover.

[0010] As a preferred embodiment, the valve seat is further provided with an installation groove, and the valve body is placed in the installation groove for detachable connection. The valve seat is provided with a feeding channel and two air intake channels. One end of the feeding channel is connected to the feeding port, and one end of the two air intake channels is connected to the first air intake and the second air intake, respectively.

[0011] As a preferred embodiment, the feed channel has a three-way structure, with valve seats extending through both ends of the feed channel. Seals and feed pipes are respectively installed at both ends of the feed channel. A filter is detachably installed on the valve seat, and the filter passes through the feed channel.

[0012] As a preferred embodiment, the other end of the air intake channel extends out of the valve seat, and an air intake pipe is installed at the other end of the air intake channel.

[0013] As a preferred embodiment, a heating device is installed inside the valve seat, the heating device is close to the feed channel, and a power cord is installed on the valve seat, the power cord passing through the valve seat and electrically connected to the heating device.

[0014] The beneficial effects of the hot melt adhesive valve disclosed in this utility model are:

[0015] After the hot melt adhesive is pre-filled into the first material chamber through the feed port, air is injected into the first chamber through the first air inlet, driving the piston to slide down in the air chamber and drive the slide rod to move in conjunction, so that the limit nut touches the stroke nut, the plug moves away from the discharge port, and the connection between the first material chamber and the second material chamber is opened, and the hot melt adhesive is sprayed through the nozzle.

[0016] During the processing, when the worker needs to adjust the amount of adhesive dispensed, the worker rotates the stroke nut to move it up and down along the valve body. Through the contact linkage between the limit nut and the stroke nut, the slide rod is controlled to drive the plug to move linearly, thereby adjusting the size of the plug opening discharge port, and thus realizing real-time stepless adjustment of the amount of adhesive dispensed during the spraying process.

[0017] After the air in the first chamber is cut off, air is injected into the second chamber through the second air inlet, driving the piston to slide and rise in the air chamber and drive the slide rod to block the discharge port, thereby stopping the spraying process; during the upward movement of the plug, a negative pressure back suction effect is generated. The distance of the plug from the discharge port is adjusted by the stroke nut to control the amount of adhesive back suctioned by the nozzle and eliminate the dripping problem. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a hot melt adhesive valve according to this utility model.

[0019] Figure 2 This is a schematic diagram of the valve body structure of a hot melt adhesive valve according to this utility model.

[0020] Figure 3 This is a cross-sectional view of a hot melt adhesive valve according to this utility model.

[0021] Figure 4 This is a schematic diagram of the nozzle installation of a hot melt adhesive valve according to this utility model.

[0022] Figure 5 This is a schematic diagram of the installation of the stroke nut of a hot melt adhesive valve according to this utility model.

[0023] Figure 6 This is a schematic diagram of the first sealing cover structure of a hot melt adhesive valve according to this utility model.

[0024] Figure 7 This is a schematic diagram of the valve body installation of a hot melt adhesive valve according to this utility model.

[0025] Figure 8 This is a cross-sectional view of the valve body and valve seat of a hot melt adhesive valve according to this utility model.

[0026] Figure 9 This is a cross-sectional view of the feed channel of a hot melt adhesive valve according to this utility model.

[0027] Figure 10 This is a cross-sectional view of the heating device for a hot melt adhesive valve according to this utility model. Detailed Implementation

[0028] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0029] Please refer to Figures 1-6 .

[0030] The present invention discloses a hot melt adhesive valve, comprising a valve body 1, a slide rod 2, a stroke nut 3, a nozzle 4, and a valve seat 5.

[0031] The valve body 1 has a first material chamber 11 and an air chamber 12, which are located near the two ends of the valve body 1, respectively.

[0032] The slide rod 2 passes through the valve body 1 and is slidably connected to the valve body 1. The slide rod 2 passes through the first material chamber 11 and the air chamber 12. Two first sealing rings are sleeved on the outside of the slide rod 2. The first sealing rings are fixedly connected to the valve body 1. The two first sealing rings are close to the first material chamber 11 and the air chamber 12 respectively.

[0033] The valve body 1 is covered with a first sealing cover 13 and a second sealing cover 14 at both ends. The first sealing cover 13 is placed on the first material chamber 11 and the second sealing cover 14 is placed on the air chamber 12.

[0034] Furthermore, the valve body 1 is provided with an inlet 111 and a outlet 131. The inlet 111 passes into the valve body 1 and communicates with the first material chamber 11. The outlet 131 is located on the first sealing cover 13 and passes through the first sealing cover 13 to communicate with the first material chamber 11. A valve ring 132 is installed on the first sealing cover 13, and the outlet 131 is located inside the valve ring 132. One end of the slide rod 2 passes through the outlet 131 and the valve ring 132. The slide rod 2 passes through the second sealing cover 14, and a second sealing ring is fitted on the slide rod 2. The second sealing ring is fixedly connected to the second sealing cover 14.

[0035] Furthermore, three recesses are provided on the inner wall of the discharge port 131. The hot melt adhesive in the first material chamber 11 flows through the recesses and then flows out of the first material chamber 11 through the gap between the valve body 1 and the slide rod 2.

[0036] A plug 21 is fixedly connected to one end of the slide rod 2, and the plug 21 touches the valve ring 132; a piston 22 is fixedly connected to the middle of the slide rod 2, and the piston 22 is located in the air chamber 12. The piston 22 divides the air chamber 12 into a first chamber 121 and a second chamber 123. A first air inlet 122 and a second air inlet 124 are provided on the valve body 1. The first air inlet 122 and the second air inlet 124 are respectively connected to the first chamber 121 and the second chamber 123; three third sealing rings are fixedly connected to the valve body 1. The first air inlet 122, the second air inlet 124 and the feed inlet 111 are respectively located in the three third sealing rings.

[0037] The second sealing cover 14 has a threaded hole, and the outer side of the stroke nut 3 has an external thread. The stroke nut 3 is connected to the threaded hole of the second sealing cover 14 of the valve body 1 through the external thread. By rotating the stroke nut 3 forward or backward, the stroke nut 3 moves up and down along the valve body 1.

[0038] Furthermore, the slide rod 2 passes through the stroke nut 3, and the other end of the slide rod 2 is fixedly connected to the limit nut 23. The limit nut 23 and the stroke nut 3 are spaced a certain distance apart. By rotating the stroke nut 3, the distance between the stroke nut 3 and the limit nut 23 can be adjusted.

[0039] The nozzle 4 is detachably connected to the valve body 1. The first sealing cover 13 is located between the nozzle 4 and the valve body 1. The nozzle 4 has a second material chamber 41. The plug 21 is located in the second material chamber 41. When the plug 21 is away from the valve ring 132, the first material chamber 11 is connected to the second material chamber 41 through the discharge port 131. The second material chamber 41 is connected to the nozzle 4 nozzle outlet.

[0040] After the hot melt adhesive is pre-filled into the first material chamber 11 through the feed port 111, air is injected into the first chamber 121 through the first air inlet 122. This drives the piston 22 to slide down in the air chamber 12 and drives the slide rod 2 to move in conjunction, so that the limit nut 23 touches the stroke nut 3, the plug 21 moves away from the valve ring 132, and the connection between the first material chamber 11 and the second material chamber 41 is opened. The hot melt adhesive in the first material chamber 11 is injected into the second material chamber 41 through the discharge port 131. The hot melt adhesive is then sprayed through the nozzle 4.

[0041] During the processing, when the worker needs to adjust the glue dispensing amount, the stroke nut 3 is rotated to move up and down along the valve body 1. When the glue dispensing amount is to be reduced, the stroke nut 3 is rotated to rise in the valve body 1. The stroke nut 3 pulls the plug 21 up through the limit nut 23 and the slide rod 2, bringing the plug 21 closer to the valve ring 132. This reduces the size of the discharge port 131 opened by the plug 21, thus reducing the glue dispensing amount. When the glue dispensing amount is to be increased, the stroke nut 3 is rotated to fall in the valve body 1. The stroke nut 3 pulls the plug 21 down through the limit nut 23 and the slide rod 2, moving the plug 21 away from the valve ring 132. This increases the size of the discharge port 131 opened by the plug 21, thus increasing the glue dispensing amount. This allows for real-time stepless adjustment of the glue dispensing amount during the spraying process.

[0042] After the air in the first chamber 121 is cut off, air is injected into the second chamber 123 through the second air inlet 124, driving the piston 22 to slide and rise in the air chamber 12 and drive the slide rod 2 to block the discharge port 131, thereby stopping the spraying process; during the upward movement of the plug 21, a negative pressure back suction effect is generated. The distance of the plug 21 from the discharge port 131 is adjusted by the stroke nut 3 to control the amount of adhesive back suctioned by the nozzle 4 and eliminate the dripping problem.

[0043] Please refer to Figures 7-10 .

[0044] The valve seat 5 has an installation groove 51, and the valve body 1 is placed in the installation groove 51 and detachably connected by bolts. The valve seat 5 has a structure design that surrounds the valve body 1, which improves the heat insulation effect of the valve body 1 and reduces heat loss.

[0045] Furthermore, the valve seat 5 is provided with a feeding channel 52 and two air inlet channels 53. One end of the feeding channel 52 is connected to the feeding port 111, and one end of each of the two air inlet channels 53 is connected to the first air inlet 122 and the second air inlet 124 respectively. The other end of the air inlet channel 53 extends out of the valve seat 5, and an air inlet pipe 531 is installed at the other end of the air inlet channel 53. The air inlet pipe 531 injects air into the air chamber 12 through the air inlet channel 53.

[0046] Furthermore, in this embodiment, the feed channel 52 preferably has a three-way structure. Both ends of the feed channel 52 extend out of the valve seat 5. A filter 523 is detachably installed on the valve seat 5. The filter 523 passes through the feed channel 52. When the hot melt adhesive flows through the feed channel 52, it needs to pass through the filter 523. The filter 523 filters out impurities in the hot melt adhesive. Seals 522 and feed pipes 521 are respectively installed at the other ends of the feed channel 52. The seal 522 is detachably connected to the feed channel 52. The detachable design of the seal 522 facilitates cleaning of the feed channel 52 during later maintenance. The outside of the seal 522 is sprayed with heat insulation material to prevent the temperature of the hot melt adhesive from being conducted outward through the seal 522 and to prevent workers from being burned.

[0047] A heating device 541 is installed inside the valve seat 5. In this embodiment, it is preferred that there are two heating devices 541. The two heating devices 541 are respectively close to the two sides of the feed channel 52 to improve the heating efficiency of the hot melt adhesive in the feed channel 52. A power cord 54 is installed on the valve seat 5. The power cord 54 passes through the valve seat 5 and is electrically connected to the heating device 541.

[0048] This utility model provides a hot melt adhesive valve. After the hot melt adhesive is pre-filled into the first material chamber through the inlet, air is injected into the first chamber through the first air inlet. This drives the piston to slide down in the air chamber and drive the slide rod to move in conjunction, so that the limit nut touches the stroke nut, the plug moves away from the discharge port, and the connection between the first material chamber and the second material chamber is opened. The hot melt adhesive is then sprayed through the nozzle.

[0049] During the processing, when the worker needs to adjust the amount of adhesive dispensed, the worker rotates the stroke nut to move it up and down along the valve body. Through the contact linkage between the limit nut and the stroke nut, the slide rod is controlled to drive the plug to move linearly, thereby adjusting the size of the plug opening discharge port, and thus realizing real-time stepless adjustment of the amount of adhesive dispensed during the spraying process.

[0050] After the air in the first chamber is cut off, air is injected into the second chamber through the second air inlet, driving the piston to slide and rise in the air chamber and drive the slide rod to block the discharge port, thereby stopping the spraying process; during the upward movement of the plug, a negative pressure back suction effect is generated. The distance of the plug from the discharge port is adjusted by the stroke nut to control the amount of adhesive back suctioned by the nozzle and eliminate the dripping problem.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A hot melt adhesive valve, characterized in that, include The valve body has a first material chamber and an air chamber, and the valve body has a material inlet and a discharge outlet communicating with the first material chamber. The valve body also has a first air inlet and a second air inlet. The nozzle has a second material chamber inside, the nozzle is detachably connected to the valve body, the second material chamber is connected to the discharge port, and the second material chamber is connected to the nozzle outlet; A stroke nut, which is connected to the valve body; A sliding rod passes through the valve body and the stroke nut, and is slidably connected thereto. One end of the sliding rod is fixedly connected to a plug, which is located in the second material chamber and touches the discharge port. A piston is fixedly connected to the middle of the sliding rod, which divides the air chamber into a first chamber and a second chamber. The first air inlet and the second air inlet are respectively connected to the first chamber and the second chamber. The other end of the sliding rod is fixedly connected to a limit nut, which is spaced a certain distance from the stroke nut.

2. A hot melt adhesive valve as described in claim 1, characterized in that, The valve body is covered with a first sealing cover and a second sealing cover at both ends. The discharge port is located on the first sealing cover. The first sealing cover is placed on the first material chamber. The first sealing cover is located between the nozzle and the valve body. The slide rod passes through the second sealing cover. The second sealing cover is placed on the air chamber. The stroke nut is connected to the second sealing cover.

3. A hot melt adhesive valve as described in claim 2, characterized in that, A valve ring is installed on the first sealing cover, the discharge port is located inside the valve ring, and the plug touches the valve ring.

4. A hot melt adhesive valve as described in claim 3, characterized in that, The second sealing cover has a threaded hole, and the outer side of the stroke nut has an external thread, which is engaged with the threaded hole of the second sealing cover.

5. A hot melt adhesive valve as described in any one of claims 1 or 4, characterized in that, It also includes a valve seat, on which an installation groove is provided. The valve body is placed in the installation groove and can be detachably connected. The valve seat has a feeding channel and two air intake channels. One end of the feeding channel is connected to the feeding port, and one end of the two air intake channels is connected to the first air intake and the second air intake, respectively.

6. A hot melt adhesive valve as described in claim 5, characterized in that, The feed channel has a three-way structure, with valve seats extending through both ends of the feed channel. Seals and feed pipes are installed at the other two ends of the feed channel, respectively. A filter is detachably installed on the valve seat, and the filter passes through the feed channel.

7. A hot melt adhesive valve as described in claim 5, characterized in that, The other end of the air intake channel extends out of the valve seat, and an air intake pipe is installed at the other end of the air intake channel.

8. A hot melt adhesive valve as described in claim 5, characterized in that, A heating device is installed inside the valve seat, which is located near the feed channel. A power cord is installed on the valve seat and passes through the valve seat to be electrically connected to the heating device.

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