Top adjustable counteracting doctor blade

Abstract

The utility model provides adjustable reverse scraping knife of top, including piston cavity, the upper end of piston cavity is installed with upper cover, and the bottom of piston cavity corresponds the position of upper cover and is installed with sealed cavity, the bottom of sealed cavity is installed with flow channel lower cover, and the bottom of flow channel lower cover is fixed with scraper head, the four corners of upper cover are inserted with mounting screw, piston cavity, sealed cavity and flow channel lower cover are connected with upper cover locking through mounting screw, the center of upper cover is rotatory and is inserted with stroke adjusting screw rod, the bottom of stroke adjusting screw rod is provided with piston, the position of piston cavity, sealed cavity and flow channel lower cover inside corresponds piston and is set up with flow channel, and the structure of adjusting stroke has done to top, by adjusting stroke screw rod, stroke limit sleeve and piston, supplementary reset spring has composed new stroke adjusting mode, makes it more convenient adjustment, can adjust at will and will not influence its service life, avoids air leakage, glue leakage, jam and so on trouble.

Description

Technical Field

[0001] This utility model relates to the field of adhesive coating and scraping technology (mainly for scraping adhesive onto express delivery bags / bubble bags), specifically an adjustable top-mounted reverse-pull scraper. Background Technology

[0002] Glue application squeegee spray guns are mainly used to evenly apply or spray glue onto the surface of objects, and are widely used in coating and bonding processes in industrial production. Hot melt glue spray guns are suitable for the composite processing of materials such as non-woven fabrics, cartons, mattresses, and sofas, achieving bonding by melting the glue at high temperatures.

[0003] The existing hot melt adhesive spray guns require adjustment of the stroke size from the empty position of the sealed cavity. Due to the small space and complex structure, it is very inconvenient to adjust. Furthermore, excessive adjustments or lack of experience can lead to malfunctions such as air leakage, adhesive leakage, and jamming, increasing maintenance costs and reducing service life. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a top-adjustable reverse-pull scraper to solve the problems mentioned in the background art. This utility model has a novel structure, which integrates the stroke adjustment mechanism at the top. The stroke adjustment screw, stroke limit sleeve, piston, and auxiliary reset spring are combined to form a new stroke adjustment method, making it more convenient to adjust. It can be adjusted at will without affecting its service life and avoids faults such as air leakage, glue leakage, and jamming.

[0005] To achieve the above objectives, this utility model employs the following technical solution: a top-adjustable reverse-pull scraper, comprising a piston cavity, an upper cover mounted on the upper end of the piston cavity, and a sealing cavity mounted on the bottom of the piston cavity corresponding to the position of the upper cover. A flow channel lower cover is mounted on the bottom of the sealing cavity, and a scraper head is fixed to the bottom of the flow channel lower cover. Mounting screws are inserted into the four corners of the upper cover. The piston cavity, sealing cavity, and flow channel lower cover are locked to the upper cover by mounting screws. A stroke adjustment screw is rotatably inserted into the center of the upper cover, and a piston is provided at the bottom of the stroke adjustment screw. Flow channels are opened inside the piston cavity, sealing cavity, and flow channel lower cover corresponding to the position of the piston.

[0006] Furthermore, the bottom of the scraper head is provided with an adhesive outlet, and the side of the scraper head is provided with an adhesive inlet. The scraper head has an internal cavity, and the cavity of the scraper head is connected to the adhesive outlet and the flow channel.

[0007] Furthermore, two air pipes are fixedly installed on the surface of the piston cavity on the other side of the upper cover, and a solenoid valve is fixedly installed on the top of the air pipes.

[0008] Furthermore, an upper plug seal is inserted into the top of the sealed cavity, and a limiting gasket is fitted onto the top of the upper plug seal.

[0009] Furthermore, a stroke limiting sleeve is fixed to the top of the piston, and the stroke limiting sleeve is rotatably connected to the bottom of the stroke adjusting screw. An auxiliary return spring is fixedly sleeved to the bottom of the piston, and the other end of the auxiliary return spring is fixedly connected to the limiting washer.

[0010] Furthermore, a reverse-pull body is inserted into the interior of the flow channel lower cover, and a reverse-pull pin is fixed on the top of the reverse-pull body. A lower plug seal is slidably sleeved on the lower end surface of the reverse-pull pin. A guide copper sleeve is installed on the upper end of the reverse-pull pin located on the lower plug seal. The reverse-pull pin is inserted into the interior of the sealing cavity.

[0011] Furthermore, a second sealing ring is provided between the bottom outlet of the flow channel cover and the cavity of the scraper head, and a first sealing ring is provided on the outer periphery of the flow channel cover at the glue inlet.

[0012] Furthermore, a third sealing ring is provided at the position where the upper cover protrudes from the piston cavity.

[0013] The beneficial effects of this utility model are:

[0014] 1. In this utility model, the hot melt adhesive melts and enters the lower cover of the flow channel under pressure. At this time, the piston is controlled by the solenoid valve to reciprocate to open and close the back-pulling pin. The scraper head scrapes the hot melt adhesive onto the product. The structure for adjusting the stroke is located at the top. The stroke adjustment screw, stroke limit sleeve and piston, and auxiliary reset spring are combined to form a new stroke adjustment method, which makes it easier to adjust. It can be adjusted at will without affecting its service life and avoids failures such as air leakage, glue leakage and jamming.

[0015] 2. When the ejector pin closes upwards, this invention generates an upward suction phenomenon, which draws the residual adhesive from the scraper head back into the flow channel. This avoids incomplete adhesive removal and stringing during the coating process, improving product quality and aesthetics, increasing production efficiency, and reducing the cost of cleaning residual adhesive for customers. This makes it widely applicable to products with high process requirements.

[0016] 3. This utility model uses a second sealing ring to maintain the sealing of the scraper head cavity and the outlet end of the flow channel, a first sealing ring to maintain the sealing between the glue inlet and the flow channel, and a third sealing ring to maintain the sealing of the position where the stroke adjustment screw passes between the top cover and the piston cavity.

[0017] 4. Compared with the prior art, this utility model places the stroke adjustment structure at the top. The stroke adjustment screw, stroke limit sleeve and piston, and auxiliary reset spring are combined to form a new stroke adjustment method, which makes it more convenient to adjust. It can be adjusted at will without affecting its service life and avoids failures such as air leakage, glue leakage and jamming. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the top adjustable reverse scraper of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the top adjustable reverse scraper of this utility model;

[0020] Figure 3 This is an exploded plan view of the top adjustable reverse scraper of this utility model;

[0021] Figure 4 This is a three-dimensional exploded view of the top adjustable reverse scraper of this utility model.

[0022] In the diagram: 1. Piston chamber; 11. Limiting gasket; 12. Upper plug seal; 2. Sealing chamber; 3. Back-pull body; 31. Lower plug seal; 32. Back-pull ejector pin; 33. Guide copper sleeve; 4. Lower cover of flow channel; 41. First sealing ring; 42. Second sealing ring; 43. Scraper head; 44. Glue outlet; 45. Glue inlet; 5. Stroke limiting sleeve; 51. Piston; 52. Auxiliary return spring; 53. Stroke adjusting screw; 6. Air pipe; 7. Upper cover; 71. Third sealing ring; 72. Mounting screw; 73. Solenoid valve. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figures 1 to 4This utility model provides a technical solution: a top-adjustable reverse-pull scraper, including a piston cavity 1, an upper cover 7 installed at the upper end of the piston cavity 1, and a sealing cavity 2 installed at the bottom of the piston cavity 1 corresponding to the position of the upper cover 7. A flow channel lower cover 4 is installed at the bottom of the sealing cavity 2, and a scraper head 43 is fixed at the bottom of the flow channel lower cover 4. Mounting screws 72 are inserted into the four corners of the upper cover 7. The piston cavity 1, the sealing cavity 2, and the flow channel lower cover 4 are locked to the upper cover 7 by the mounting screws 72. A stroke adjustment screw 53 is rotatably inserted into the center of the upper cover 7, and the bottom of the stroke adjustment screw 53 is provided with... There is a piston 51. The piston cavity 1, the sealing cavity 2 and the flow channel cover 4 are provided with flow channels corresponding to the position of the piston 51. After the hot melt adhesive melts, it enters the flow channel cover 4 under pressure. At this time, the piston 51 is controlled to reciprocate by the solenoid valve 73 to realize the opening and closing of the back-pulling pin 32. The scraper head 43 scrapes the hot melt adhesive onto the product. The structure for adjusting the stroke is placed at the top. The stroke adjustment screw, the stroke limit sleeve 5 and the piston 51 and the auxiliary reset spring 52 are combined to form a new stroke adjustment method, which makes it easier to adjust. It can be adjusted at will without affecting its service life and avoids failures such as air leakage, glue leakage and jamming.

[0025] In this embodiment, the scraper head 43 has a glue outlet 44 at its bottom and a glue inlet 45 on its side. The scraper head 43 has an internal cavity that connects the glue outlet 44 and the flow channel. An upper plug seal 12 is inserted into the top of the sealing cavity 2, and a limiting gasket 11 is fitted onto the top of the upper plug seal 12. A stroke limiting sleeve 5 is fixed to the top of the piston 51, and the stroke limiting sleeve 5 is rotatably connected to the bottom of the stroke adjusting screw 53. An auxiliary return spring 52 is fixedly fitted onto the bottom of the piston 51, and the other end of the auxiliary return spring 52 is fixedly connected to the limiting gasket 11. A reverse-pull body 3 is inserted into the interior of the flow channel lower cover 4, and a reverse-pull pin 32 is fixed to the top of the reverse-pull body 3. The lower surface of the reverse-pull pin 32... The upper sliding sleeve is fitted with a lower plug seal 31. The reverse pull pin 32 is located at the upper end of the lower plug seal 31 and is equipped with a guide copper sleeve 33. The reverse pull pin 32 is inserted into the sealing cavity 2. The piston cavity 1 is located on the surface of the other side of the upper cover 7 and two air pipes 6 are fixedly installed. The top of the air pipes 6 is fixedly installed with a solenoid valve 73. In this structure, the reverse pull pin 32 is open when it is downward and closed when it is upward. When the reverse pull pin 32 is closed upward, a physical phenomenon of upward suction will be generated momentarily, so as to draw back the glue remaining on the scraper head 43 into the flow channel. This avoids the phenomenon of incomplete glue breakage and stringing during the product scraping process, improves the product quality and aesthetics, increases production efficiency, and reduces the cost of cleaning residual glue for customers. It can be widely used in some products with high process requirements.

[0026] In this embodiment, a second sealing ring 42 is provided between the bottom outlet of the flow channel of the lower cover 4 and the cavity of the scraper head 43. A first sealing ring 41 is provided around the glue inlet 45 of the lower cover 4. A third sealing ring 71 is provided at the corresponding protrusion positions of the upper cover 7 and the piston cavity 1. The second sealing ring 42 maintains the sealing of the cavity of the scraper head 43 and the outlet end of the flow channel. The first sealing ring 41 maintains the sealing between the glue inlet 45 and the flow channel. The third sealing ring 71 maintains the sealing of the position through which the stroke adjusting screw 53 passes between the upper cover 7 and the piston cavity 1.

[0027] When using the device, the hot melt adhesive melts and enters the lower cover 4 of the flow channel under pressure. At this time, the piston 51 is controlled by the solenoid valve 73 to reciprocate, thereby opening and closing the back-pulling pin 32. The scraper head 43 scrapes the hot melt adhesive onto the product. In this structure, the back-pulling pin 32 is open when it is downward and closed when it is upward. When the back-pulling pin 32 is closed upward, a physical phenomenon of upward suction is generated momentarily, thereby achieving the goal of sucking back the adhesive remaining on the scraper head 43 into the flow channel. This avoids the phenomenon of incomplete glue cutting, stringing and tailing during the product scraping process, improves the quality and aesthetics of the product, increases production efficiency, and reduces the cost of cleaning residual glue strings for customers, making it widely used in some products with high process requirements.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A top-adjustable reverse-pull scraper, including a piston cavity (1), characterized in that: The piston cavity (1) is equipped with an upper cover (7) at its upper end, and a sealing cavity (2) is installed at the bottom of the piston cavity (1) corresponding to the position of the upper cover (7). A flow channel lower cover (4) is installed at the bottom of the sealing cavity (2), and a scraper head (43) is fixed at the bottom of the flow channel lower cover (4). Mounting screws (72) are inserted at the four corners of the upper cover (7). The piston cavity (1), sealing cavity (2) and flow channel lower cover (4) are locked to the upper cover (7) by mounting screws (72). A stroke adjustment screw (53) is rotatably inserted at the center of the upper cover (7). A piston (51) is provided at the bottom of the stroke adjustment screw (53). Flow channels are opened inside the piston cavity (1), sealing cavity (2) and flow channel lower cover (4) corresponding to the position of the piston (51).

2. The top-adjustable reverse-pull scraper according to claim 1, characterized in that: The bottom of the scraper head (43) is provided with a glue outlet (44), and the side of the scraper head (43) is provided with a glue inlet (45). The scraper head (43) has a cavity inside, and the cavity of the scraper head (43) is connected to the glue outlet (44) and the flow channel.

3. The top-adjustable reverse-pull scraper according to claim 1, characterized in that: Two air pipes (6) are fixedly installed on the surface of the piston cavity (1) on the other side of the upper cover (7), and a solenoid valve (73) is fixedly installed on the top of the air pipes (6).

4. The top-adjustable reverse-pull scraper according to claim 1, characterized in that: The top of the sealed cavity (2) is fitted with an upper plug seal (12), and the top of the upper plug seal (12) is fitted with a limiting gasket (11).

5. The top-adjustable reverse-pull scraper according to claim 1, characterized in that: The piston (51) is fixed with a stroke limiting sleeve (5) at the top, and the stroke limiting sleeve (5) is rotatably connected to the bottom of the stroke adjusting screw (53). An auxiliary reset spring (52) is fixedly sleeved at the bottom of the piston (51), and the other end of the auxiliary reset spring (52) is fixedly connected to the limiting pad (11).

6. The top-adjustable reverse-pull scraper according to claim 1, characterized in that: The flow channel cover (4) is inserted with a reverse-pull body (3), and a reverse-pull pin (32) is fixed on the top of the reverse-pull body (3). A lower plug seal (31) is slidably sleeved on the lower surface of the reverse-pull pin (32). A guide copper sleeve (33) is installed on the upper end of the lower plug seal (31). The reverse-pull pin (32) is inserted into the sealing cavity (2).

7. The top-adjustable reverse-pull scraper according to claim 1, characterized in that: A second sealing ring (42) is provided between the bottom outlet of the flow channel cover (4) and the cavity of the scraper head (43), and a first sealing ring (41) is provided on the periphery of the glue inlet (45) of the flow channel cover (4).

8. The top-adjustable reverse-pull scraper according to claim 5, characterized in that: The upper cover (7) is provided with a third sealing ring (71) at the position where it passes through the piston cavity (1).

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