Shoemaking spraying equipment and method based on 3D printing technology

Abstract

The present invention relates to the field of shoe spraying technology, and more specifically, to a shoe spraying device and method based on 3D printing technology. It comprises a mechanical arm and a fixing part, wherein a glue spraying tube, a hot air tube and a roller are arranged side by side at the bottom of the fixing part, and a cleaning mechanism is arranged above the roller, and the cleaning mechanism is used to scrape off the overflowed glue when the roller moves along the edge of the sole. The glue overflowing from the gap is scraped off by moving a scraper along the edge of the sole, and the ejected hot air flows through the exhaust channel inside the scraper, and the hot air heats the inside of the scraper to soften the glue attached to the inside of the scraper to limit the adhesion of the glue, and the hot air can also soften the solidified glue inside the collection box after passing through the collection box, thereby improving the fluidity of the glue, so that the glue can flow to the glue storage ring for storage, avoiding blockage in the collection box and affecting the recovery of the glue.

Description

Technical Field

[0001] The present invention relates to the field of shoemaking spraying technology, and in particular to shoemaking spraying equipment and a method based on 3D printing technology. Background Art

[0002] 3D printing technology has been used in many fields such as jewelry design, shoe design and manufacturing, industrial design, architectural design, etc. It is also widely used in medical fields such as aerospace and dentistry.

[0003] Shoes are essential daily necessities for human beings. When shoes are debonded, they need to be processed again. First, the impurities in the cracks of the debonded shoes are cleaned, and then glue is sprayed into the cracks using spraying equipment and the upper and the sole are bonded together by extrusion.

[0004] When the glue spraying equipment in the prior art is used, an expansion mechanism is usually used to widen the cracks, and then glue is sprayed into the cleaned cracks using the glue spraying device. However, in real life, in order to increase the layering and beauty of the shoes, the welts between the soles and the uppers (that is, laces, which are decorative parts) are usually set in an up and down shape. When the user's shoes are debonded, it is necessary to spray glue on the shoe seams for a second time. The glue sprayed into the gaps by the glue spraying equipment overflows outward under the action of squeezing, especially when the welts of the soles are flat or concave. Then, the glue overflowing from the concave welts of the soles will adhere to the uppers, affecting the aesthetics of the shoes. Summary of the invention

[0005] The purpose of the present invention is to provide a shoe-making spraying device and method based on 3D printing technology to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention aims to provide a shoe-making spraying equipment based on 3D printing technology, including a mechanical arm and a fixing part, the far end of the mechanical arm is fixedly connected to the fixing part, and a glue spraying hose, a hot air pipe and a roller are arranged side by side at the bottom of the fixing part in sequence, and a cleaning mechanism is arranged above the roller, and the cleaning mechanism is used to scrape off the overflowed glue when the roller moves along the edge of the sole, and a piston cylinder is arranged above the cleaning mechanism, and the symmetrical two sides of the piston cylinder are respectively connected with an exhaust pipe and an air storage box, and the end of the exhaust pipe away from the piston cylinder is close to the hot air pipe, and the hot air pipe is used to heat the overflowed and solidified glue. In the process of the cleaning mechanism moving along the edge of the sole, the cleaning mechanism rises and falls and cooperates with the exhaust pipe to draw the hot air sprayed from the hot air pipe into the air storage box for storage, and the air storage box is connected with the cleaning mechanism, so that the hot air stored in the air storage box is used to heat the cleaning mechanism, so that the glue falls off the cleaning mechanism.

[0007] As a further improvement of the present technical solution, the glue spray hose is rotatably connected to the expansion piece, an air flow channel is arranged inside the expansion piece, a filter plate is arranged inside the air flow channel, and the end of the air flow channel is connected to the first hose through the trachea, the first hose is connected to the bronchus, the bronchus is connected to the hot air pipe and presents a "Y" shape, so that when the hot air in the hot air pipe flows, a negative pressure is formed in the bronchus, and the expansion piece at the end of the air flow channel away from the trachea is conical.

[0008] As a further improvement of the present technical solution, a compression spring is arranged inside the piston cylinder below the first hose, and the cleaning mechanism is moved upward to apply pressure to the compression spring, so that the compression spring squeezes the first hose above, the first hose is deformed, and a baffle passes through the top of the first hose, and the baffle is fixedly connected to the inner wall of the piston cylinder.

[0009] As a further improvement of the technical solution, the return spring sleeved on the glue spraying hose respectively abuts against the lower surface of the expansion piece and the fixing piece, and the stopper arranged below the expansion piece is fixedly connected to the glue spraying hose.

[0010] As a further improvement of the present technical solution, the cleaning mechanism includes a scraper and a piston rod fixedly connected to the bottom of the scraper, the scraper is curved from bottom to top, a scraper is provided on the side of the scraper away from the piston rod, the bottom of the piston rod is rotatably connected to a roller, the piston rod passes through the top of the piston cylinder and is coaxially connected to a piston plate, the piston plate is sleeved and fitted with the piston cylinder, and the compression spring above the piston plate is fixedly connected.

[0011] As a further improvement of the present technical solution, a collecting box is fixedly connected to the bottom of the scraper, the end of the collecting box is connected to a rubber storage ring fixedly connected to the bottom of the piston rod, and the opening of the collecting box extends inward and beyond the scraper, and the angle formed between the scraper and the collecting box is used to fit closely with the edge of the sole.

[0012] As a further improvement of the present technical solution, a one-way valve is provided at the connection between the exhaust pipe and the piston cylinder, and an air inlet hole is opened on the piston cylinder symmetrically with the axis of the piston cylinder at the connection between the exhaust pipe and the piston cylinder, a one-way valve is provided in the air inlet hole, and the air inlet hole is higher than the baffle in the horizontal direction.

[0013] As a further improvement of the technical solution, an auxiliary pipe is also provided at the bottom of the piston cylinder, a second hose is connected to the bottom of the gas storage box, and a pressure relief valve is provided at the connection between the gas storage box and the second hose.

[0014] As a further improvement of the technical solution, the second hose at one end away from the gas storage box is connected to an exhaust channel arranged inside the scraper, and the collection box is located on the path of the exhaust gas from the exhaust channel.

[0015] The second object of the invention is to provide a method for operating a shoe-making spraying device based on 3D printing technology as described above, comprising the following steps:

[0016] S1, inserting the expansion piece into the gap formed by the sole and the upper, and moving the expansion piece along the track of the gap under the action of the robotic arm;

[0017] S2. During the movement, the glue spraying hose sprays glue into the gap, the hot air pipe softens the glue to prevent it from solidifying, and then the roller squeezes the edge of the sole to make the edge of the sole fit tightly with the upper;

[0018] S3, using a scraper and a scraper to scrape off the glue overflowing from the gap, and sucking the hot air blown out of the glue spraying hose into the piston cylinder, and under the action of the piston plate, compressing the hot air into the air storage box for storage;

[0019] S4. The hot air in the air storage box is released to heat the scraper to prevent the glue from adhering to the inner side of the scraper.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the shoe-making spraying equipment based on 3D printing technology, a scraper is used to move along the edge of the sole to scrape off the glue overflowing from the gap. The ejected hot air flows through the exhaust channel inside the scraper. The hot air heats the inside of the scraper to soften the glue attached to the inside of the scraper to limit the adhesion of the glue. Moreover, after the hot air flows through the collection box, it can also soften the solidified glue inside the collection box, thereby improving the fluidity of the glue, allowing the glue to flow to the glue storage ring for storage, avoiding blockage in the collection box and affecting the recovery of the glue.

[0022] 2. In the shoe-making spraying equipment based on 3D printing technology, the piston plate is moved upward to push the compression spring to squeeze the first hose. After being squeezed, the first hose is deformed and the cross-sectional area is reduced. The speed of the gas will increase with the decrease of the cross-sectional area of ​​the pipeline, that is to say, the negative pressure in the air flow channel increases. Therefore, when the expansion piece passes through the raised sole edge, the negative pressure is used to draw the impurities in the gap into the air flow channel, thereby improving the effect of cleaning impurities in the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the cross-section structure of the expansion piece of the present invention;

[0025] Figure 3 It is a schematic diagram of the connection structure between the expansion piece and the piston cylinder of the present invention;

[0026] Figure 4 This is a schematic diagram of the hot air pipe and bronchial pipe connection structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the internal structure of the piston cylinder and the gas storage box of the present invention;

[0028] Figure 6 It is a schematic diagram of the connection structure between the scraper and the piston rod of the present invention;

[0029] Figure 7 It is a schematic diagram of the cutaway structure of the scraper and the collecting box of the present invention;

[0030] Figure 8 It is a schematic diagram of the collecting box, the rubber storage ring and the scraper structure of the present invention.

[0031] The meaning of each number in the figure is:

[0032] 100, mechanical arm; 101, fixing part; 102, glue spraying hose; 103, hot air pipe; 104, roller; 105, stopper; 106, filter plate;

[0033] 110, piston cylinder; 111, bronchial tube; 112, first hose; 113, auxiliary tube; 114, baffle;

[0034] 120, air extraction pipe; 130, air storage box; 131, second hose;

[0035] 140. expansion member; 141. return spring;

[0036] 150. Collection box;

[0037] 160, rubber storage ring;

[0038] 200, cleaning mechanism; 210, scraper; 220, piston rod; 221, piston plate; 222, compression spring. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] like Figure 1 , Figure 2 and Figure 5 As shown, a shoe spraying device based on 3D printing technology is provided, including a mechanical arm 100 and a fixing member 101, wherein the distal end of the mechanical arm 100 is fixedly connected to the fixing member 101, and a glue spraying tube 102, a hot air tube 103 and a roller 104 are arranged side by side at the bottom of the fixing member 101, and a cleaning mechanism 200 is arranged above the roller 104, and the cleaning mechanism 200 is used to scrape off the overflowed glue when the roller 104 moves along the edge of the sole, and a piston cylinder 110 is arranged above the cleaning mechanism 200, and the symmetrical two sides of the piston cylinder 110 are respectively connected to The exhaust pipe 120 and the air storage box 130, the end of the exhaust pipe 120 away from the piston cylinder 110 is close to the hot air pipe 103, the hot air pipe 103 is used to heat the overflowed and solidified glue, when the cleaning mechanism 200 moves along the edge of the sole, the cleaning mechanism 200 moves up and down and cooperates with the exhaust pipe 120 to draw the hot air sprayed from the hot air pipe 103 into the air storage box 130 for storage, and the air storage box 130 is connected with the cleaning mechanism 200, so that the hot air stored in the air storage box 130 is used to heat the cleaning mechanism 200, so that the glue falls off the cleaning mechanism 200.

[0043] Depend on Figure 2It can be seen that when applying glue to the debonded sole, the inside of the upper is supported by a shoe stretcher, the sole is placed on a table, and the shoe stretcher applies downward pressure to prevent the sole from sliding during gluing. Then, glue is sprayed along the gap through the glue spraying tube 102. At the same time, the roller 104 follows closely to squeeze the edge of the sole to make the edge of the sole close to the upper, and the hot air pipe 103 softens the solidified glue after the glue spraying tube 102 applies the glue, and cooperates with the cleaning mechanism 200 to clean the softened glue, thereby preventing the glue from adhering to the upper and affecting the overall aesthetics.

[0044] It should be noted that the welt of the sole presents an up-and-down fluctuation, with uneven ups and downs. Specifically, from the toe to the heel, the welt will rise slightly in some places, and may drop in other places, forming a continuous undulating curve.

[0045] In order to ensure that there will be no residual impurities in the gap between the sole and the upper when the sole is sprayed with glue for the second time, thereby affecting the firmness of the bonding between the sole and the upper, Figure 2 Based on and combined with Figure 4 and Figure 5 As shown, the glue spray hose 102 is rotatably connected to the expansion piece 140, an air flow channel is arranged inside the expansion piece 140, a filter plate 106 is arranged inside the air flow channel, and the end of the air flow channel is connected to the first hose 112 through the air pipe, the first hose 112 is connected to the bronchus 111, the bronchus 111 is connected to the hot air pipe 103 and presents a "Y" shape, so that when the hot air in the hot air pipe 103 flows, a negative pressure is formed in the bronchus 111.

[0046] In this way, when the gluing work just starts, the expansion piece 140 at the end of the air flow channel away from the trachea is conical, that is, the end of the expansion piece 140 goes deep into the gap. As the expansion piece 140 moves, the expansion piece 140 can not only expand the gap so that the glue spraying tube 102 can spray glue in the gap, but also the negative pressure generated in the bronchus 111 can also suck the impurities that are not completely cleaned in the gap into the air flow channel. The impurities are filtered through the filter plate 106, thereby achieving the purpose of cleaning the impurities in the gap and preventing the impurities from remaining in the gap and affecting the firmness of the bonding between the sole and the upper.

[0047] On the other hand, since the edge of the sole fluctuates up and down, when the amplitude of the up and down fluctuation of the edge is large, the contact area between the raised edge and the upper is large, and at this time, relatively more impurities remain in the gap. Therefore, when the cleaning mechanism 200 moves along the edge of the sole, the cleaning mechanism 200 moves upward, and a compression spring 222 is arranged inside the piston cylinder 110 below the first hose 112. The cleaning mechanism 200 moves upward to apply pressure to the compression spring 222, so that the compression spring 222 squeezes the first hose 112 above, causing the first hose 112 to deform, and the baffle 114 passes through the top of the first hose 112, and the baffle 114 is fixedly connected to the inner wall of the piston cylinder 110. In this way, the baffle 114 blocks the squeezed first hose 112, and the first hose 112 is deformed and its cross-sectional area is reduced after being squeezed. The speed of the gas increases with the reduction of the cross-sectional area of ​​the pipeline, that is to say, the negative pressure in the air flow channel increases. Therefore, when the expansion piece 140 passes through the raised edge of the sole, the negative pressure is used to draw the impurities in the gap into the air flow channel, thereby improving the effect of cleaning impurities in the gap.

[0048] Secondly, the return spring 141 on the glue spraying tube 102 abuts against the lower surface of the expansion piece 140 and the fixing piece 101 respectively, and the stopper 105 arranged below the expansion piece 140 is fixedly connected to the glue spraying tube 102. When the expansion piece 140 moves to the toe position, since the toe is in an arc shape, at this time, the expansion piece 140 and the glue spraying tube 102 rotate to make the expansion piece 140 move along the gap, and under the action of the return spring 141, it can ensure that the end of the expansion piece 140 sucking impurities is deeply in the gap, so as to prevent the expansion piece 140 from detaching from the gap.

[0049] Immediately afterwards Figure 5 Based on and combined with Figure 3 , Figure 6 The structure of the cleaning mechanism 200 is further disclosed. The cleaning mechanism 200 includes a scraper 210 and a piston rod 220 fixedly connected to the bottom of the scraper 210. The scraper 210 is curved from bottom to top. A scraper is provided on the side of the scraper 210 away from the piston rod 220. The bottom of the piston rod 220 is rotatably connected to the roller 104. The piston rod 220 passes through the top of the piston cylinder 110 and is coaxially connected to the piston plate 221. The piston plate 221 is sleeved with the piston cylinder 110, and the compression spring 222 above the piston plate 221 is fixedly connected. On the other hand, combined with Figure 8 As shown, a collecting box 150 is fixedly connected to the bottom of the scraper 210, and the end of the collecting box 150 is connected to a rubber storage ring 160 fixedly connected to the bottom of the piston rod 220, and the opening of the collecting box 150 extends inward and beyond the scraper. The angle formed between the scraper and the collecting box 150 is used to fit the edge of the sole.

[0050] Therefore, during the process of gluing, the roller 104 squeezes the edge to make the edge close to the upper, and the scraper moves along the edge of the sole, so as to use the scraper to scrape off the glue overflowing from the gap. Due to the bending characteristics of the arc scraper, it is easier to control the direction and angle of force when using it, so as to maintain the flow direction of the glue during the scraping process, making it more difficult to move upward, and the scraped glue moves downward to the collection box 150 under the action of gravity.

[0051] However, after the softened glue is scraped off by the scraper, the glue will adhere to the inner side of the scraper 210 (in Figure 7 For example, the position of the scraper is the inner side, and vice versa), and the glue will solidify soon after softening. In this way, the solidified glue will cause the inside of the collection box 150 to be blocked, affecting the recovery of the glue.

[0052] To this end, return to Figure 2 and Figure 5 As shown, a one-way valve is provided at the connection between the air extraction pipe 120 and the piston cylinder 110, and an air inlet hole is provided on the piston cylinder 110 symmetrically with the axis of the piston cylinder 110 at the connection between the air extraction pipe 120 and the piston cylinder 110, and a one-way valve is provided in the air inlet hole, and the air inlet hole is higher than the baffle 114 in the horizontal direction. In addition, an auxiliary pipe 113 is provided at the bottom of the piston cylinder 110, and a second hose 131 is connected to the bottom of the air storage box 130, and a pressure relief valve is provided at the connection between the air storage box 130 and the second hose 131. In this way, when the piston rod 220 moves upward, that is, the piston plate 221 compresses the gas, the one-way valve arranged at the connection between the exhaust pipe 120 and the piston cylinder 110 is closed, the one-way valve in the air inlet hole is opened, and the pressure relief valve arranged at the connection between the gas storage box 130 and the second hose 131 is closed. At this time, the external gas enters the piston cylinder 110 from the auxiliary pipe 113, and the piston plate 221 squeezes the gas inside the piston cylinder 110 into the gas storage box 130 for short-term storage.

[0053] On the contrary, when the piston plate 221 is in the process of exhausting air, the piston plate 221 moves downward under the elastic action of the compression spring 222, the one-way valve provided at the connection between the exhaust pipe 120 and the piston cylinder 110 opens, the hot air ejected from the hot air pipe 103 enters the piston cylinder 110 from the exhaust pipe 120, and the one-way valve in the air inlet is closed. The above process is repeated in this way, and the piston plate 221 continuously squeezes the drawn hot air into the gas storage box 130 for storage. When the pressure in the gas storage box 130 breaks through the pressure relief valve, the gas in the gas storage box 130 can be ejected from the second hose 131. At this time, combined with Figure 7As shown, the second hose 131 at one end away from the gas storage box 130 is connected to the exhaust channel set inside the scraper 210, and the collecting box 150 is located on the path of the exhaust gas from the exhaust channel. Then, the ejected hot air flows through the exhaust channel inside the scraper 210, and the hot air heats the inside of the scraper 210 to soften the glue attached to the inner side of the scraper 210 to limit the adhesion of the glue.

[0054] At the same time, the hot air flows toward the collection box 150 through the exhaust channel. After the hot air flows through the collection box 150, it can also soften the solidified glue inside the collection box 150, thereby improving the fluidity of the glue and allowing the glue to flow to the glue storage ring 160 for storage, thereby avoiding blockage in the collection box 150 and affecting the recovery of the glue.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A shoe-making spraying device based on 3D printing technology, comprising a mechanical arm (100) and a fixing member (101), wherein the distal end of the mechanical arm (100) is fixedly connected to the fixing member (101), and a glue spraying hose (102), a hot air hose (103) and a roller (104) are arranged side by side at the bottom of the fixing member (101), characterized in that: A cleaning mechanism (200) is arranged above the roller (104), and the cleaning mechanism (200) is used to scrape off the overflowed glue when the roller (104) moves along the edge of the sole, and a piston cylinder (110) is arranged above the cleaning mechanism (200), and the symmetrical two sides of the piston cylinder (110) are respectively connected to the exhaust pipe (120) and the air storage box (130), and the end of the exhaust pipe (120) away from the piston cylinder (110) is close to the hot air pipe (103), and the hot air storage box (130) is connected to the hot air pipe (103). The air duct (103) is used to heat the overflowed and solidified glue. When the cleaning mechanism (200) moves along the edge of the sole, the cleaning mechanism (200) rises and falls and cooperates with the exhaust pipe (120) to draw the hot air ejected from the hot air duct (103) into the air storage box (130) for storage. The air storage box (130) is connected to the cleaning mechanism (200), so that the hot air stored in the air storage box (130) is used to heat the cleaning mechanism (200), so that the glue falls off the cleaning mechanism (200); The glue spraying tube (102) is rotatably connected to the expansion piece (140); an air flow channel is provided inside the expansion piece (140); a filter plate (106) is provided inside the air flow channel; and the end of the air flow channel is connected to a first hose (112) via an air pipe; the first hose (112) is connected to a bronchus (111); the bronchus (111) is connected to the hot air pipe (103) and presents a "Y" shape, so that when hot air in the hot air pipe (103) flows, negative pressure is formed in the bronchus (111); the expansion piece (140) at the end of the air flow channel away from the air pipe is conical; A compression spring (222) is arranged inside the piston cylinder (110) below the first hose (112); the cleaning mechanism (200) is moved upward to apply pressure to the compression spring (222), so that the compression spring (222) squeezes the first hose (112) above, causing the first hose (112) to deform, and the first hose (112) passes through a baffle (114) above; the baffle (114) is fixedly connected to the inner wall of the piston cylinder (110); The return spring (141) sleeved on the glue spraying tube (102) respectively abuts against the lower surface of the expansion piece (140) and the fixing piece (101), and the stopper (105) arranged below the expansion piece (140) is fixedly connected to the glue spraying tube (102); The cleaning mechanism (200) comprises a scraper (210) and a piston rod (220) fixedly connected to the bottom of the scraper (210); the scraper (210) is curved from bottom to top; a scraper is provided on the side of the scraper (210) away from the piston rod (220); a roller (104) is rotatably connected to the bottom of the piston rod (220); the piston rod (220) passes through the top of the piston cylinder (110) and is coaxially connected to a piston plate (221); the piston plate (221) is sleeved and matched with the piston cylinder (110); and a compression spring (222) above the piston plate (221) is fixedly connected.

2. The shoe-making spraying equipment based on 3D printing technology according to claim 1 is characterized in that: The bottom of the scraper (210) is fixedly connected to a collecting box (150), the end of the collecting box (150) is connected to a rubber storage ring (160) fixedly connected to the bottom of the piston rod (220), and the opening of the collecting box (150) extends inwardly and exceeds the scraper, and the angle formed between the scraper and the collecting box (150) is used to fit with the edge of the sole.

3. The shoe-making spraying equipment based on 3D printing technology according to claim 1 is characterized in that: A one-way valve is provided at the connection between the air extraction pipe (120) and the piston cylinder (110), and an air inlet hole is provided on the piston cylinder (110) symmetrically with the axis of the piston cylinder (110) at the connection between the air extraction pipe (120) and the piston cylinder (110), wherein the one-way valve is provided in the air inlet hole, and the air inlet hole is higher than the baffle (114) in the horizontal direction.

4. The shoe-making spraying equipment based on 3D printing technology according to claim 2 is characterized in that: An auxiliary pipe (113) is also provided at the bottom of the piston cylinder (110), a second hose (131) is connected to the bottom of the gas storage box (130), and a pressure relief valve is provided at the connection between the gas storage box (130) and the second hose (131).

5. The shoe-making spraying equipment based on 3D printing technology according to claim 4 is characterized in that: The second hose (131) at one end away from the gas storage box (130) is in communication with an exhaust passage provided inside the scraper (210), and the collection box (150) is located on a path for exhausting gas from the exhaust passage.

6. A method for operating the shoemaking spraying equipment based on 3D printing technology according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1, inserting the expansion piece (140) into the gap formed by the sole and the upper, and moving the expansion piece (140) along the track of the gap under the action of the mechanical arm (100); S2. During the movement, the glue spraying tube (102) sprays glue into the gap, the hot air tube (103) softens the glue to prevent the glue from solidifying, and then the roller (104) squeezes the edge of the sole to make the edge of the sole closely attached to the upper; S3, using a scraper (210) and a scraper to scrape off the glue overflowing from the gap, and sucking the hot air blown out from the glue spraying hose (102) into the piston cylinder (110), and under the action of the piston plate (221), compressing the hot air into the air storage box (130) for storage; S4. The hot air in the air storage box (130) is released to heat the scraper (210), so as to prevent the glue from adhering to the inner side of the scraper (210).

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