A dispensing machine

Abstract

A dispensing machine provided by the present invention includes a housing, a glue inlet valve group, and a glue outlet valve. A glue storage cavity is arranged inside the housing. The glue inlet valve group and the glue outlet valve are respectively arranged on the side wall of the housing. The glue outlet of the glue inlet valve group and the glue inlet of the glue outlet valve are respectively communicated with the glue storage cavity. In the dispensing machine provided by the present invention, a glue back-suction structure is formed inside the glue outlet valve by cooperating with a glue outlet valve stem and a control cavity. The glue outlet valve stem moves up and down to change the volume of the inner cavity of the glue outlet valve to form negative pressure, thereby well sucking the residual glue inside the dispensing tube back into the glue outlet valve at the moment when the dispensing machine stops dispensing, and well avoiding the phenomenon of dripping or wire drawing.

Description

Technical Field

[0001] The present invention relates to the technical field of dispensing equipment, and particularly to a dispenser. Background Art

[0002] The dispensing valve is the most important working component on the dispenser. A dispenser is an automated machine that controls fluids through a dispensing valve and drips or coats the fluids on the surface or inside of products. With the continuous development of technology, dispensers are widely used in the automotive manufacturing industry, electronic manufacturing industry, industrial electricity, solar photovoltaics, construction engineering, etc., and the market application is quite popular; currently, the equipment is manual, semi-automatic, and fully automatic. The degree of automation is getting higher and higher.

[0003] The application fields of dispensers are constantly enriched and developed, and various forms of requirements are also put forward for the dispensing valve. Currently, there are more than 30 types of dispensing valves on the market in the dispensing industry. According to the glue discharging method, the dispensing valve can be divided into contact type and non-contact type. The non-contact dispensing valve is a new technology developed in recent years. Similar to the inkjet printing principle, it has the advantages of high speed and small glue dots, but the technology is not very mature and is very sensitive to the viscosity of the glue; while the traditional contact dispensing valve is widely used because of its simple and reliable structure, stable performance, wide application range, and long service life. Common ones include: thimble type dispensing valve, plunger type dispensing valve, diaphragm type dispensing valve, AB two-component dispensing valve, and rotary dispensing valve, etc.

[0004] Common problems when using existing dispensing valves for dispensing are the glue remaining on the needle tip after dispensing and the problem of wire drawing during dispensing. The glue remaining on the needle tip, part of it will drip onto the product or fixture due to gravity, and part of it will cause the glue discharge amount to decrease due to solidification, affecting the product quality, and even clogging the needle tip or needle tube; wire drawing occurs when the needle tip moves. If the wire drawing gets on the adhesive, it will affect the dispensing effect. At the same time, when the glue inside the dispensing valve cannot be used up in time, the glue will solidify, thus affecting the overall working efficiency of the dispenser. Summary of the Invention

[0005] In view of the above problems existing in the prior art, a dispenser provided by the present invention has a glue back suction structure inside the glue discharging valve, which can well suck the residual glue inside the dispensing tube back into the glue discharging valve instantly when dispensing stops, and well avoid the phenomenon of dripping glue or wire drawing.

[0006] To achieve the above invention purpose, the technical solution adopted by the present invention is as follows:

[0007] A dispensing machine, comprising a housing, a glue inlet valve group and a glue outlet valve. A glue storage cavity is arranged inside the housing. The glue inlet valve group and the glue outlet valve are respectively arranged on the side wall of the housing. The glue outlet of the glue inlet valve group and the glue inlet of the glue outlet valve are respectively communicated with the glue storage cavity;

[0008] The glue outlet valve comprises a glue outlet valve body, a glue outlet valve piston and a glue outlet valve rod. A power cavity, a movable cavity, a glue inlet cavity, a control cavity and a slide rod cavity are sequentially arranged inside the glue outlet valve body.

[0009] The glue outlet valve piston is arranged in the power cavity. Vent holes are respectively arranged on the side walls of the power cavity on the upper and lower sides of the glue outlet valve piston.

[0010] The glue outlet valve rod is sequentially provided with a first part, a second part and a third part.

[0011] The first part is located in the movable cavity and is slidably and sealingly connected with the movable cavity.

[0012] A glue passing ring is arranged between the glue inlet cavity and the control cavity. Glue passing holes are arranged on the glue passing ring.

[0013] The second part is located in the glue passing hole, and the outer diameter of the second part is smaller than the inner diameter of the glue passing hole.

[0014] The third part is located in the slide rod cavity and is slidably and sealingly connected with the slide rod cavity.

[0015] The upper end of the first part is connected to the lower end of the glue outlet valve piston. The glue outlet valve piston drives the glue outlet valve rod to move downward so that the lower end surface of the first part fits against the upper end surface of the glue passing ring to seal the glue passing hole.

[0016] The outer diameter of the first part is smaller than the inner diameter of the glue inlet cavity. The outer diameter of the third part is smaller than or equal to the inner diameter of the control cavity and larger than the outer diameter of the first part.

[0017] The glue inlet of the glue outlet valve is arranged on the side wall of the glue inlet cavity and is communicated with the glue inlet cavity. An outlet for the glue is arranged on the side wall of the control cavity and penetrates through the glue outlet valve body. A dispensing tube is connected to the outlet for the glue.

[0018] In one embodiment, a threaded hole is arranged on the lower end surface of the glue outlet valve piston. Threads are arranged on the side wall of the upper end of the first part. The upper end of the first part is screwed into the threaded hole on the glue outlet valve piston.

[0019] In one embodiment, a threaded adjustment hole communicating with the power chamber is provided on the top wall of the glue outlet valve body. An adjustment screw is screwed in the threaded adjustment hole, and a fastening nut is screwed on the adjustment screw above the threaded adjustment hole.

[0020] In one embodiment, the glue inlet valve group includes a switch valve, a glue inlet valve, and a control valve. The switch valve, the glue inlet valve, and the control valve are connected in sequence. The control valve includes a control valve body, a control valve piston, and a control valve rod. An inlet glue channel, an outlet glue channel, a piston channel, and a valve rod channel are provided inside the control valve body. The inlet glue channel communicates with the outlet glue channel. The control valve piston is arranged in the piston channel, and the control valve rod is arranged in the valve rod channel. A sealing ring is provided at the connection between the outlet glue channel and the housing. One end of the control valve rod is connected to the control valve piston. Vent holes are respectively provided on the side walls of the piston channel on both sides of the control valve piston. The control valve piston drives the control valve rod to approach the sealing ring so that its end is inserted into the central hole of the sealing ring to block the outlet glue channel. A proximity sensor for detecting the position of the control valve rod is provided on the end face of the glue inlet valve group away from the housing.

[0021] In one embodiment, the lower end face of the first part and the edge of the control valve rod near the sealing ring are respectively rounded. Tapered counterbores are respectively provided at the upper end of the glue passing hole and one end of the sealing ring near the control valve rod.

[0022] In one embodiment, a first sealing ring is arranged in the movable chamber, and the first sealing ring is sleeved outside the first part to realize a sliding seal connection between the first part and the movable chamber. A first softening agent hole is provided at a position corresponding to the first sealing ring on the side wall of the movable chamber. The outer end of the first softening agent hole is connected with a first softening agent pipe made of a transparent material. The first sealing ring includes two upper and lower first sealing rings, and a gap is provided between the two upper and lower first sealing rings. The first softening agent hole communicates with the gap between the two upper and lower first sealing rings;

[0023] A second sealing ring is arranged in the sliding rod chamber, and the second sealing ring is sleeved outside the third part to realize a sliding seal connection between the third part and the sliding chamber. A second softening agent hole is provided at a position corresponding to the second sealing ring on the side wall of the sliding chamber. The outer end of the second softening agent hole is connected with a second softening agent pipe made of a transparent material. The second sealing ring includes two upper and lower second sealing rings, and a gap is provided between the two upper and lower second sealing rings. The second softening agent hole communicates with the gap between the two upper and lower second sealing rings;

[0024] A third sealing ring is arranged in the valve rod channel, and the third sealing ring is sleeved outside the control valve rod. A third softening agent hole is arranged at a position corresponding to the third sealing ring on the side wall of the valve rod channel. The outer end of the third softening agent hole is connected with a third softening agent pipe made of a transparent material. The third sealing ring includes two third sealing rings on the left and right, and a gap is arranged between the two third sealing rings on the left and right. The third softening agent hole communicates with the gap between the two third sealing rings on the left and right.

[0025] In one embodiment, a driving cavity is arranged inside the housing above the glue storage cavity. A lead screw nut is arranged inside the driving cavity. A driving motor is arranged above the housing. The main shaft of the driving motor penetrates through the top wall of the housing and is in transmission connection with the lead screw nut. A piston rod is arranged inside the glue storage cavity. Threads are arranged on the side wall of the upper end of the piston rod. The upper end of the piston rod penetrates through the top of the glue storage cavity and is screwed with the lead screw nut.

[0026] In one embodiment, a speed reducer is arranged between the housing and the driving motor. The driving motor drives the lead screw nut to rotate through the speed reducer to realize the up and down movement of the piston rod.

[0027] In one embodiment, a heating pipe and a temperature sensor are arranged at positions corresponding to the glue storage cavity on the side wall of the housing.

[0028] In one embodiment, pressure sensors for detecting the glue inlet pressure inside the glue storage cavity and the glue inlet valve are respectively arranged on the side walls of the housing and the glue inlet valve.

[0029] Compared with the prior art, a dispensing machine provided by the present invention has the following advantages:

[0030] 1. In the dispensing machine provided by the present invention, a glue back suction structure is formed inside the glue outlet valve by arranging a glue outlet valve rod and a control cavity in cooperation. The glue outlet valve rod moves up and down to change the volume of the inner cavity of the glue outlet valve to form negative pressure, so as to well suck the residual glue inside the dispensing tube back into the glue outlet valve at the moment when the dispensing machine stops dispensing, and well avoid the phenomena of dripping glue or wire drawing.

[0031] 2. The glue in the glue storage cavity is pushed by the piston rod and ejected by the glue outlet valve to realize the dispensing operation. The up and down movement of the piston rod is driven by a servo motor in cooperation with a bearing group and a ball screw pair, achieving the purpose of precisely controlling the glue output and the glue output speed, and greatly improving the operation efficiency of the entire dispensing machine.

[0032] 3. By arranging heating tubes and temperature sensors in the interlayer of the side wall of the glue storage cavity, the glue in the glue storage cavity can be heated, thereby effectively controlling the viscosity of the glue, improving the fluidity of the rubber compound, and avoiding the phenomenon that the glue solidifies in the glue storage cavity.

[0033] 4. By respectively arranging pressure sensors for detecting the glue inlet pressure inside the glue storage cavity and the glue inlet valve on the side walls of the housing and the glue inlet valve, the control system cooperating with the dispensing machine can control the glue inlet and outlet speeds of the dispensing machine according to the detection signals of the pressure sensors, so as to achieve precise dispensing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0035] Figure 2 is a schematic internal structure diagram of the present invention;

[0036] Figure 3 is a schematic internal structure diagram of the control valve in the present invention;

[0037] Figure 4 is a schematic three-dimensional structure diagram of the glue outlet valve in the present invention;

[0038] Figure 5 is a schematic internal structure diagram of the glue outlet valve in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0041] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0044] As Figures 1-5 shown, for the convenience of description, the azimuth references of "up", "down", "left", "right", "front", and "back" in the present invention are based on the Figure 1 azimuth shown;

[0045] A dispensing machine includes a housing 1, a glue inlet valve group 2, and a glue outlet valve 3. A glue storage cavity 101 is provided inside the housing 1. The glue inlet valve group 2 and the glue outlet valve 3 are respectively arranged on the side walls of the housing 1. The glue outlet of the glue inlet valve group 2 and the glue inlet of the glue outlet valve 3 are respectively communicated with the glue storage cavity 101.

[0046] Preferably, the glue outlet of the glue inlet valve group 2 is communicated with the glue inlet of the glue storage cavity 101, the glue inlet of the glue outlet valve 3 is communicated with the glue outlet of the glue storage cavity 101, and the glue inlet of the glue storage cavity 101 is located on the upper side wall of the glue storage cavity 101, and the glue outlet of the glue storage cavity 101 is located on the lower side wall of the glue storage cavity 101. In this way, the glue temporarily stored in the glue storage cavity 101 will enter and exit the glue inlet cavity 101 in an orderly manner according to the principle of first in first out, avoiding the glue that enters the glue storage cavity 101 first from being output from the glue storage cavity 101 later or accumulating in the glue storage cavity 101, resulting in the glue being stored in the glue storage cavity 101 for too long and affecting the quality of the glue;

[0047] The glue outlet valve 3 includes a glue outlet valve body 301, a glue outlet valve piston 302 and a glue outlet valve rod 303. A power cavity 3011, a movable cavity 3012, a glue inlet cavity 3013, a control cavity 3014 and a slide rod cavity 3015 are sequentially arranged in the glue outlet valve body 301 from top to bottom;

[0048] The glue outlet valve piston 302 is arranged in the power cavity 3011. First vent holes 304 are respectively arranged on the side walls of the power cavity 3011 on the upper and lower sides of the glue outlet valve piston 302. The first vent holes 304 are externally connected to an external air source and cooperate with a corresponding reversing valve to control the air inlet and outlet directions of the upper and lower two first vent holes 304, thereby driving the glue outlet valve piston 302 to move up and down in the power cavity 3011;

[0049] The glue outlet valve rod 303 is sequentially provided with a first part 3031, a second part 3032 and a third part 3033;

[0050] The first part 3031 is located in the movable cavity 3012 and is slidably and sealingly connected to the movable cavity 3012;

[0051] A glue passing ring 305 is arranged between the glue inlet cavity 3013 and the control cavity 3014, and a glue passing hole 3051 is arranged on the glue passing ring 305;

[0052] The second part 3032 is located in the glue passing hole 3051, and the outer diameter of the second part 3032 is smaller than the inner diameter of the glue passing hole 3051. In this way, a glue passing gap for allowing glue to pass through is formed between the second part 3032 and the glue passing hole 3051;

[0053] The third part 3033 is located in the slide rod cavity 3015 and is slidably and sealingly connected to the slide rod cavity 3015;

[0054] The upper end of the first part 3031 is connected to the lower end of the glue discharging valve piston 302. Specifically, a threaded hole is provided on the lower end face of the glue discharging valve piston 302, and a thread is provided on the side wall of the upper end of the first part 3031. The upper end of the first part 3031 is screwed into the threaded hole on the lower end face of the glue discharging valve piston 302 to achieve the connection between the two. The glue discharging valve piston 302 drives the glue discharging valve stem 303 to move downward so that the lower end face of the first part 3031 fits against the upper end face of the glue passing ring 305 to seal the glue passing hole 3051.

[0055] The outer diameter of the first part 3031 is smaller than the inner diameter of the glue inlet cavity 3013, and the outer diameter of the third part 3033 is smaller than or equal to the inner diameter of the control cavity 3014 and larger than the outer diameter of the first part 3031.

[0056] The glue inlet of the glue discharging valve 3 is provided on the side wall of the glue inlet cavity 3013 and communicates with the glue inlet cavity 3013. A glue outlet is provided on the side wall of the control cavity 3014 and penetrates through the glue discharging valve body 301. A dispensing tube 4 is connected to the glue outlet.

[0057] In this embodiment, a threaded adjustment hole 306 communicating with the power cavity 3011 is provided on the top wall of the glue discharging valve body 301. An adjustment screw 307 is screwed into the threaded adjustment hole 306, and a fastening nut 308 is screwed onto the adjustment screw 307 above the threaded adjustment hole 306. By controlling the distance that the adjustment screw 307 penetrates into the power cavity 306, the distance of the up and down movement of the glue discharging valve piston 302 is limited. Because the cavity formed by the glue inlet cavity 3013 and the control cavity 3014 decreases in volume occupied by the glue discharging valve stem 303 as the glue discharging valve stem 303 moves downward, and the volume reduction amount is equal to the volume amount that the third part 3033 retracts downward into the slide rod cavity 3015 minus the volume increase amount of the first part 3031 entering the glue inlet cavity 3013. Since this part of the volume change will generate negative pressure in the glue inlet cavity 3013 and the control cavity 3014, this part of the volume will be filled by the backflow of the glue in the dispensing tube 4 communicating with the glue outlet of the glue discharging valve body 301. Therefore, the distance of the up and down movement of the glue discharging valve piston 302 directly determines the magnitude of the negative pressure generated in the glue inlet cavity 3013 and the control cavity 3014 during the downward movement of the glue discharging valve stem 303, thereby controlling the magnitude of the backflow volume of the glue in the dispensing tube 4 communicating with the glue outlet of the glue discharging valve body 301. On the other hand, it can also adjust and control the size of the opening between the lower end face of the first part 3031 and the upper end face of the glue passing ring 305 during the first period of opening and the second period of closing to limit the flow rate and velocity of the glue passing between the lower end face of the first part 3031 and the upper end face of the glue passing ring 305.

[0058] In this embodiment, the glue inlet valve group 2 includes a switching valve 201, a glue inlet valve 202, and a control valve 203. The switching valve 201, the glue inlet valve 202, and the control valve 203 are connected in sequence. The control valve 203 includes a control valve body 2031, a control valve piston 2032, and a control valve stem 2033. An inlet glue channel 20311, an outlet glue channel 20312, a piston channel 20313, and a valve stem channel 20314 are provided inside the control valve body 2031. The inlet glue channel 20311 is located above the outlet glue channel 20312 and communicates with the outlet glue channel 20312. The control valve piston 2032 is arranged in the piston channel 20313, and the control valve stem 2033 is arranged in the valve stem channel 20314. A sealing ring 204 is provided at the connection between the outlet glue channel 20312 and the housing 1. One end of the control valve stem 2033 is connected to the control valve piston 2032. Second air vents 205 are respectively provided on the side walls of the piston channel 20313 on both sides of the control valve piston 2032. The second air vents 205 are externally connected to an external air source, and cooperate with a corresponding reversing valve to control the air inlet and outlet directions of the left and right second air vents 205, thereby driving the control valve piston 2032 to move left and right in the piston channel 20313. Furthermore, the control valve piston 2032 drives the control valve stem 2033 to approach the sealing ring 204 so that its end is inserted into the central hole of the sealing ring 204 to block the outlet glue channel 20312. At the same time, a proximity sensor 206 for detecting the position of the control valve stem 2033 is provided on the end face of the glue inlet valve group 2 away from the housing 1. The proximity sensor 206 transmits its detection signal to a controller that cooperates with the dispensing machine provided by the present invention. The controller can control the air inlet time and air inlet direction of the air source that supplies air to the dispensing machine according to the control program inside it and the detection signals of each sensor, so as to realize the automatic control of the opening and closing action of the control valve 203.

[0059] In this embodiment, the lower end face of the first part 3031 and the edge of the control valve stem 2033 near the sealing ring 204 are respectively subjected to rounding treatment. Tapered counterbores are respectively provided at the upper end of the glue passing hole 3051 and one end of the sealing ring 204 near the control valve stem 2033. Therefore, sealing surfaces are respectively formed between the lower end face of the first part 3031 and the upper end of the glue passing hole 3051, and between one end of the control valve stem 2033 near the sealing ring 204 and one end of the sealing ring 204 near the control valve stem 2033, so as to achieve the sealing between the lower end face of the first part 3031 and the upper end of the glue passing hole 3051, and between one end of the control valve stem 2033 near the sealing ring 204 and one end of the sealing ring 204 near the control valve stem 2033.

[0060] In this embodiment, a first sealing ring 309 is disposed in the movable cavity 3012, and the first sealing ring 309 is sleeved outside the first part 3031 to achieve a sliding sealing connection between the first part 3031 and the movable cavity 3012. A first softening agent hole is provided at a position corresponding to the first sealing ring 309 on the side wall of the movable cavity 3012. The outer end of the first softening agent hole is connected to a first softening agent pipe 310 made of a transparent material. The first sealing ring 309 includes two upper and lower first sealing rings 309, and a gap is provided between the two upper and lower first sealing rings 309. The first softening agent hole communicates with the gap between the two upper and lower first sealing rings 309. The softening agent can be conveniently injected between the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303 through the first softening agent pipe 310 and the first softening agent hole. Because when the lower end of the first part 3031 reciprocates into and out of the glue inlet cavity 3013, glue is inevitably adhered to its surface. Therefore, injecting the softening agent between the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303 can not only lubricate between the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303, but also, by the action of the softening agent, peel off the glue adhered to the first part 3031 of the glue discharging valve stem 303. On the other hand, after the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303 cooperate with each other for a long time, when the first sealing ring 309 is worn or aged, the gap between the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303 will become larger. Therefore, the glue adhered to the lower end of the first part 3031 may enter the first softening agent pipe 310 through the first softening agent hole as the first part 3031 moves upward. Because the first softening agent pipe 310 is made of a transparent material, when the user finds traces of glue in the first softening agent pipe 310, it indicates that the gap between the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303 is too large at this time, and the first sealing ring 309 or the glue discharging valve stem 303 needs to be repaired or replaced, which plays a very good warning role. Preferably, a dust cover is provided at the end of the first softening agent pipe 310 to prevent external dust or foreign objects from entering the first softening agent pipe 310 and even affecting the sealing performance between the first sealing ring 309 and the first part 3031 of the glue discharging valve stem 303.

[0061] Similarly, a second sealing ring 311 is provided in the sliding rod cavity 3015, and the second sealing ring 3012 is sleeved on the outside of the third part 3033 to realize a sliding sealing connection between the third part 3033 and the sliding cavity 3015, and a second softener hole is provided at a position corresponding to the second sealing ring 311 on the side wall of the sliding cavity 3015, and the outer end of the second softener hole is connected to a second softener tube 312 made of a transparent material, and the second sealing ring 311 includes two upper and lower second sealing rings 311, and a gap is provided between the upper and lower second sealing rings 311, and the second softener hole is connected to the gap between the upper and lower second sealing rings 311; the structure and function of the second sealing ring 311 and the second softener tube 312 here are the same as those of the first sealing ring 309 and the first softener tube 310 mentioned above, and therefore, they are not repeated here.

[0062] Similarly, a third sealing ring 207 is provided in the valve stem channel 20314, and the third sealing ring 207 is sleeved on the outside of the control valve stem 2033, and a third softener hole is provided on the side wall of the valve stem channel 20314 at a position corresponding to the third sealing ring 207, and the outer end of the third softener hole is connected to a third softener tube 208 made of transparent material, and the third sealing ring 207 includes two left and right third sealing rings 207, and a gap is provided between the two left and right third sealing rings 207, and the third softener hole is connected to the gap between the two left and right third sealing rings 207; the structure and function of the third sealing ring 207 and the third softener tube 208 here are the same as those of the above-mentioned first sealing ring 309 and the first softener tube 310, so they are not repeated here.

[0063] In the present embodiment, a driving chamber 102 is arranged inside the shell body above the glue storage chamber 101, a lead screw nut 103 is arranged inside the driving chamber 102, a driving motor 4 is arranged above the shell body 1, the main shaft of the driving motor 4 passes through the top wall of the shell body 1 and is transmission-connected with the lead screw nut 103, a piston rod 104 is arranged inside the glue storage chamber 101, a thread is arranged on the side wall at the upper end of the piston rod 104, the upper end of the piston rod 104 passes through the top of the glue storage chamber 101 and is threadedly connected with the lead screw nut 103, a reducer 5 is arranged between the shell body 1 and the driving motor 4, the driving motor 4 drives the lead screw nut 103 to rotate through the reducer 5 to realize the up and down movement of the piston rod 104; the driving motor 4 can realize precise control of the lead screw nut 103 through the reducer 5, thereby greatly improving the accuracy of the dispensing operation of the dispensing machine provided by the present invention.

[0064] In this embodiment, a heating pipe and a temperature sensor are provided at a position on the side wall of the housing 1 corresponding to the glue storage cavity 101. The heating pipe is designed to heat the glue stored inside the glue storage cavity 101, so as to always ensure good fluidity of the glue, avoid the glue from solidifying in the glue storage cavity 101 and affecting the effect of the entire dispensing operation. Secondly, the temperature sensor detects the temperature of the glue in the glue storage cavity 101 at any time, and the temperature sensor transmits its detection signal to the controller that cooperates with the dispensing machine provided by the present invention. The controller can control the heating duration and the on / off time point of the heating pipe according to the control program inside it and the detection signal of the temperature sensor, avoiding the glue from solidifying due to overheating or overcooling, and realizing the automatic control of the heating action of the heating pipe.

[0065] In this embodiment, pressure sensors 7 for detecting the glue inlet pressure inside the glue storage cavity 101 and the inlet valve 202 are respectively provided on the side walls of the housing 1 and the inlet valve 202. The pressure sensors 7 transmit their detection signals to the controller that cooperates with the dispensing machine provided by the present invention. The controller can control the glue inlet speed of the device supplying glue to the dispensing machine according to the control program inside it and the detection signals of the respective pressure sensors 7, and cooperate with the above-mentioned respective proximity sensors 206 and temperature sensors 103 and other sensors to realize the automatic control of the dispensing action of the entire dispensing machine, greatly improving the efficiency and accuracy of the entire dispensing machine operation.

[0066] The back suction principle of the present invention is: before the glue outlet valve piston 302 drives the glue outlet valve stem 303 to move downward, the glue inlet valve group 2 has stopped supplying glue, and at the same time, the drive motor 4 also stops injecting the glue in the glue storage cavity 101 into the glue inlet cavity 3013.

[0067] During the process of the glue outlet valve piston 302 driving the glue outlet valve stem 303 to move downward, since the outer diameter of the third part 3033 is less than or equal to the inner diameter of the control cavity 3014 and greater than the outer diameter of the first part 3031, and at the same time, the distance that the third part 3033 retracts from the control cavity 3014 into the slide rod cavity 3015 is equal to the distance that the first part 3031 enters the glue inlet cavity 3013, but the outer diameter of the third part 3033 is greater than the outer diameter of the first part 3031.

[0068] Before the lower end surface of the first part 3031 is not in contact with the upper end surface of the glue-passing ring 305, the glue inlet cavity 3013 and the control cavity 3014 are in communication with each other. Therefore, as the glue outlet valve stem 303 moves downward, the volume of the cavity formed by the glue inlet cavity 3013 and the control cavity 3014 decreases. The amount of volume reduction is equal to the volume of the third part 3033 retracting downward into the sliding rod cavity 3015 minus the increased volume of the first part 3031 entering the glue inlet cavity 3013. Since this change in volume will generate negative pressure in the glue inlet cavity 3013 and the control cavity 3014, the glue in the dispensing tube 4 connected to the glue outlet of the glue outlet valve body 301 will backflow to fill this part of the volume, thereby achieving the back suction effect. Finally, as the glue outlet valve stem 303 moves downward, the lower end surface of the first part 3031 of the glue outlet valve stem 303 is in contact with the upper end surface of the glue-passing ring 305 to seal the glue-passing hole 3051, and the glue inlet of the control cavity 3014 is completely sealed, avoiding the phenomenon of glue dripping or wire drawing in the dispensing tube 4 when dispensing stops.

[0069] Preferably, the dispensing machine provided by the present invention can adjust the number of the housing 1, the glue inlet valve group 2 and the glue outlet valve 3 included in a dispensing machine according to the type of glue composition. For example, for the dispensing operation of AB glue on the market at present, when using the dispensing machine of the present invention for dispensing, two sets of the housing 1, the glue inlet valve group 2 and the glue outlet valve 3 can be set on the same dispensing machine. Finally, the AB glue coming out of the glue outlet of the two glue outlet valves 3 is mixed into a dispensing tube 4 through a pipeline to realize the dispensing operation of AB glue. At the same time, according to the mixing ratio of AB glue, the dispensing speed of A or B glue can be controlled respectively to match the ratio of the components of different mixed glues.

[0070] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0071] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A dispensing machine, characterized in that, it includes a housing, a glue inlet valve group and a glue outlet valve. A glue storage cavity is arranged inside the housing. The glue inlet valve group and the glue outlet valve are respectively arranged on the side wall of the housing. The glue outlet of the glue inlet valve group and the glue inlet of the glue outlet valve are respectively communicated with the glue storage cavity; The glue outlet valve includes a glue outlet valve body, a glue outlet valve piston and a glue outlet valve rod. A power cavity, a movable cavity, a glue inlet cavity, a control cavity and a slide rod cavity are sequentially arranged inside the glue outlet valve body, the glue outlet valve piston is arranged in the power cavity, and air vents are respectively arranged on the side walls of the power cavity on the upper and lower sides of the glue outlet valve piston, the glue outlet valve rod is sequentially provided with a first part, a second part and a third part, the first part is located in the movable cavity and is slidably and sealingly connected with the movable cavity, a glue passing ring is arranged between the glue inlet cavity and the control cavity, and a glue passing hole is arranged on the glue passing ring, the second part is located in the glue passing hole, and the outer diameter of the second part is smaller than the inner diameter of the glue passing hole, the third part is located in the slide rod cavity and is slidably and sealingly connected with the slide rod cavity, the upper end of the first part is connected to the lower end of the glue outlet valve piston. The glue outlet valve piston drives the glue outlet valve rod to move downward so that the lower end surface of the first part fits against the upper end surface of the glue passing ring to seal the glue passing hole, the outer diameter of the first part is smaller than the inner diameter of the glue inlet cavity, and the outer diameter of the third part is smaller than or equal to the inner diameter of the control cavity and larger than the outer diameter of the first part, the glue inlet of the glue outlet valve is arranged on the side wall of the glue inlet cavity and is communicated with the glue inlet cavity. A glue outlet is arranged on the side wall of the control cavity and penetrates through the glue outlet valve body. A dispensing tube is connected to the glue outlet.

2. The dispensing machine according to claim 1, characterized in that, a threaded hole is arranged on the lower end surface of the glue outlet valve piston, threads are arranged on the side wall of the upper end of the first part, and the upper end of the first part is screwed into the threaded hole on the glue outlet valve piston.

3. The dispensing machine according to claim 1, characterized in that, a threaded adjustment hole communicating with the power cavity is arranged on the top wall of the glue outlet valve body. An adjustment screw is screwed into the threaded adjustment hole, and a fastening nut is screwed onto the adjustment screw above the threaded adjustment hole.

4. The dispensing machine according to claim 1, characterized in that, The glue inlet valve group includes a switching valve, a glue inlet valve, and a control valve. The switching valve, the glue inlet valve, and the control valve are connected in sequence. The control valve includes a control valve body, a control valve piston, and a control valve stem. An inlet glue channel, an outlet glue channel, a piston channel, and a valve stem channel are provided inside the control valve body. The inlet glue channel communicates with the outlet glue channel. The control valve piston is arranged in the piston channel, and the control valve stem is arranged in the valve stem channel. A sealing ring is provided at the connection between the outlet glue channel and the housing. One end of the control valve stem is connected to the control valve piston. Vent holes are respectively provided on the side walls of the piston channel on both sides of the control valve piston. The control valve piston drives the control valve stem to approach the sealing ring so that its end is inserted into the central hole of the sealing ring to block the outlet glue channel. A proximity sensor for detecting the position of the control valve stem is provided on the end face of the glue inlet valve group away from the housing.

5. A dispensing machine according to claim 4, wherein, The lower end face of the first part and the edge of the control valve stem near the sealing ring are respectively subjected to rounding treatment. Tapered counterbores are respectively provided at the upper end of the glue passing hole and one end of the sealing ring near the control valve stem.

6. A dispensing machine according to claim 5, wherein, A first sealing ring is provided in the movable cavity, and the first sealing ring is sleeved outside the first part to achieve a sliding sealing connection between the first part and the movable cavity. A first softening agent hole is provided at a position corresponding to the first sealing ring on the side wall of the movable cavity. The outer end of the first softening agent hole is connected to a first softening agent pipe made of a transparent material. The first sealing ring includes two upper and lower first sealing rings, and a gap is provided between the two upper and lower first sealing rings. The first softening agent hole communicates with the gap between the two upper and lower first sealing rings; A second sealing ring is provided in the slide rod cavity, and the second sealing ring is sleeved outside the third part to achieve a sliding sealing connection between the third part and the sliding cavity. A second softening agent hole is provided at a position corresponding to the second sealing ring on the side wall of the sliding cavity. The outer end of the second softening agent hole is connected to a second softening agent pipe made of a transparent material. The second sealing ring includes two upper and lower second sealing rings, and a gap is provided between the two upper and lower second sealing rings. The second softening agent hole communicates with the gap between the two upper and lower second sealing rings; A third sealing ring is provided in the valve stem channel, and the third sealing ring is sleeved outside the control valve stem. A third softening agent hole is provided at a position corresponding to the third sealing ring on the side wall of the valve stem channel. The outer end of the third softening agent hole is connected to a third softening agent pipe made of a transparent material. The third sealing ring includes two left and right third sealing rings, and a gap is provided between the two left and right third sealing rings. The third softening agent hole communicates with the gap between the two left and right third sealing rings.

7. A dispensing machine according to claim 1, wherein, Inside the housing above the glue storage cavity, a drive cavity is provided. Inside the drive cavity, a lead screw nut is provided. Above the housing, a drive motor is provided. The main shaft of the drive motor penetrates the top wall of the housing and is in transmission connection with the lead screw nut. Inside the glue storage cavity, a piston rod is provided. Threads are provided on the side wall of the upper end of the piston rod. The upper end of the piston rod penetrates the top of the glue storage cavity and is screwed to the lead screw nut.

8. A dispensing machine according to claim 7, characterized in that a speed reducer is provided between the housing and the drive motor, and the drive motor drives the lead screw nut to rotate through the speed reducer to realize the up and down movement of the piston rod.

9. A dispensing machine according to claim 1, characterized in that heating pipes and temperature sensors are provided at positions corresponding to the glue storage cavity on the side wall of the housing.

10. A dispensing machine according to claim 4, characterized in that pressure sensors for detecting the glue inlet pressure inside the glue storage cavity and the glue inlet valve are respectively provided on the side walls of the housing and the glue inlet valve.

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