Vacuum constant pressure air valve core structure of a folding machine

Abstract

The utility model provides a kind of vacuum constant-pressure air valve core structure of folding machine, including negative pressure suction nozzle, negative pressure pipe, fixed seat, rotating part and folding roller, fixed seat is provided on machine table, two parallelly arranged folding rollers are rotatably installed on fixed seat by rotating part, negative pressure pipe is installed in folding roller and is penetrated, negative pressure cavity is formed between folding roller and negative pressure pipe, and the both ends of negative pressure pipe are connected with negative pressure suction nozzle, negative pressure suction nozzle is connected with external negative pressure equipment, a plurality of air suction holes are evenly spaced arranged on the negative pressure pipe, air suction hole is connected with negative pressure cavity and is arranged, folding paper groove and cutting knife are arranged around the outer periphery of folding roller, the folding paper groove of folding roller is matched with the cutting knife of another adjacent folding roller and is arranged, folding paper groove is provided with suction hole, the suction hole is communicated with negative pressure cavity and is arranged through folding roller.The utility model can guarantee that vacuum constant-pressure environment is formed in negative pressure pipe, sealing effect is good, negative pressure adsorption effect is better, is more stable, to guarantee that product folding precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of folding machine structure technology, and in particular to a vacuum constant pressure air valve core structure for a folding machine. Background Technology

[0002] Vacuum adsorption folding machines are key equipment in modern textile, nonwoven fabric, and paper product finishing processes, and their performance directly affects the folding accuracy and production efficiency of the products. In existing technologies, the vacuum adsorption system is considered the core component of the folding machine. It generates negative pressure to adsorb materials, ensuring accurate positioning during conveying and folding. A folding roller, which generates internal negative pressure (vacuum), adsorbs the material surface, completing the precise folding action as the roller rotates. The current mainstream technology involves installing a negative pressure valve core through the internal shaft of the folding roller. This valve core has a specific suction port; when the roller rotates to a specific angle, the suction port of the valve core connects to the vacuum source, thereby generating adsorption force on the roller surface.

[0003] As production demands shift towards wider and more efficient operations, the length of folding rollers continues to increase. This exposes a serious inherent flaw in the traditional valve core structure with a single-point, centrally located pressure supply: Significant negative pressure attenuation and insufficient adsorption force at both ends of the roller: When the folding roller is too long, the negative pressure generated from the suction nozzle in the middle of the valve core needs to be transmitted a long distance to both ends along the narrow channel inside the roller. During this process, the friction loss of airflow increases significantly, causing the negative pressure intensity to decrease sharply with the increase of transmission distance. As a result, the adsorption force in the middle of the roller near the negative pressure suction nozzle is still acceptable, while the adsorption force at both ends of the roller far from the suction nozzle is very weak. This leads to poor folding accuracy and a high scrap rate. To ensure that the ends barely adsorb, it is often necessary to increase the overall negative pressure, which not only increases energy consumption but also fails to fundamentally solve the problem of uneven pressure, resulting in unstable product quality.

[0004] There is a need for a vacuum constant pressure valve core structure for folding machines that can solve the problems mentioned above. Utility Model Content

[0005] This invention provides a vacuum constant pressure air valve core structure for a folding machine. By technically modifying the existing folding machine, it solves the problem of poor adsorption of the negative pressure folding roller, which affects the folding effect.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A vacuum constant pressure valve core structure for a folding machine includes a negative pressure nozzle, a negative pressure tube, a fixed base, a rotating part, and folding rollers. A fixed base is provided on the machine base. Two parallel folding rollers are rotatably mounted on the fixed base via the rotating part. A negative pressure tube is installed inside each folding roller, and the folding rollers and negative pressure tubes are rotatably connected, forming a negative pressure cavity between them. The negative pressure tube is a hollow tube, with both ends connected to the negative pressure nozzle, which is connected to an external negative pressure device. A plurality of suction holes are evenly spaced on the negative pressure tube, and these suction holes communicate with the negative pressure cavity. A folding groove and a cutting blade are arranged around the outer periphery of each folding roller. The folding groove of one folding roller is matched with the cutting blade of another adjacent folding roller. An adsorption hole is provided in the folding groove, passing through the folding roller and communicating with the negative pressure cavity. An external driving device is also provided for rotating the folding rollers.

[0007] Preferably, the folding groove includes a V-shaped groove block, and the outer periphery of the folding roller is recessed with an installation groove. The V-shaped groove block is fixedly installed in the installation groove by fixing bolts. The outer surface of the V-shaped groove block is provided with a V-shaped folding groove position, and the inner side of the folding groove position is provided with an adsorption hole that communicates with the negative pressure cavity inside the folding roller.

[0008] Preferably, a cutting blade is installed at an adjacent position of each folding groove on the outer periphery of the folding roller. The outer periphery of the folding roller is provided with a cutting blade groove. A fixing screw hole perpendicular to the direction of the cutting blade is provided on the side of the cutting blade groove. The fixing bolt passes through the fixing screw hole and abuts against the cutting blade.

[0009] Preferably, the rotating part includes a rotating bearing, the outer end of the folding roller is rotatably connected to the fixed seat through the rotating bearing, and the two ends of the inner cavity of the folding roller are also rotatably connected to the negative pressure pipe through sealed bearings.

[0010] Preferably, two sealing strips are fixedly provided on the outside of the negative pressure tube, the outer end face of the sealing strips is in contact with the inner cavity of the folding roller, the adsorption hole is provided between the two sealing strips, and the negative pressure tube, the sealing strips and the inner cavity of the folding roller form a negative pressure cavity, which is opposite to a folding groove arranged on the outer periphery of the folding roller.

[0011] Preferably, a brush assembly is also fixedly installed on the outer side of the negative pressure pipe. The brush assembly is disposed inside the negative pressure chamber, and the bristles of the brush assembly are arranged to abut against the inner cavity of the folding roller.

[0012] The beneficial effects of this utility model are as follows: This invention features a negative pressure pipe valve core installed inside a folding roller, with negative pressure nozzles at both ends of the negative pressure pipe. An externally installed negative pressure device draws air to create a vacuum environment inside the negative pressure pipe, forming a negative pressure chamber within the pipe and folding roller. The folding roller has paper folding grooves distributed on its outer surface, each groove having an adsorption hole connected to the negative pressure chamber. When the driving device rotates the folding roller, the negative pressure chamber sequentially connects with the adsorption holes of the paper folding grooves on the folding roller, thereby generating an adsorption force on the roller surface, firmly adsorbing the paper into the folding grooves. The driving device also rotates the folding roller, and the paper cutting blade of an adjacent folding roller cuts the continuous paper before it is folded and placed by alternating folding rollers.

[0013] The negative pressure devices at both ends of this application can ensure that a vacuum constant pressure environment is formed inside the negative pressure tube, resulting in a good sealing effect, better negative pressure adsorption effect, and greater stability, thereby ensuring higher product folding accuracy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model installed on the machine base; Figure 2 This is a schematic diagram of the front structure of this utility model; Figure 3 This is a schematic cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the exploded structure of this utility model; Figure 5 This is a schematic diagram of the external structure of the negative pressure pipe of this utility model; Figure 6 This is a schematic diagram of the V-groove block and cutting blade structure of this utility model; Figure 7 This is a schematic diagram of the folding roller structure of this utility model; The following are the reference numerals: 1. Fixed base; 2. Negative pressure nozzle; 3. Negative pressure tube; 31. Suction hole; 32. Sealing strip; 33. Brush assembly; 4. Rotating part; 5. Folding roller; 51. Mounting groove; 52. Cutting knife groove; 53. Fixing screw hole; 54. Sealing bearing; 6. Negative pressure chamber; 7. Folding groove; 71. Adsorption hole; 72. V-shaped groove block; 8. Cutting knife. Detailed Implementation

[0015] The specific content of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0016] Please see Figure 1-7As shown, this utility model provides a vacuum constant pressure valve core structure for a folding machine, including a fixed base 1, a negative pressure suction nozzle 2, a negative pressure tube 3, a rotating part 4, and folding rollers 5. The fixed base 1 is provided on the machine base. Two parallel folding rollers 5 are rotatably mounted on the fixed base 1 via the rotating part 4. A negative pressure tube 3 is installed inside each folding roller 5, and the folding roller 5 and the negative pressure tube 3 are rotatably connected. A negative pressure cavity 6 is formed between the folding roller 5 and the negative pressure tube 3. The negative pressure tube 3 is a hollow tube, and both ends of the negative pressure tube 3 are connected to the negative pressure suction nozzle. The nozzle 2 is connected to the negative pressure suction nozzle 2 and connected to the external negative pressure equipment. Several suction holes 31 are evenly spaced on the negative pressure pipe 3. The suction holes 31 are connected to the negative pressure chamber 6. The folding roller 5 is surrounded by a folding groove 7 and a cutting knife 8. The folding groove 7 of the folding roller 5 is matched with the cutting knife 8 of another adjacent folding roller 5. The folding groove 7 is provided with an adsorption hole 71. The adsorption hole 71 passes through the folding roller 5 and is connected to the negative pressure chamber 6. A drive device for driving the folding roller 5 to rotate is also provided externally.

[0017] Both ends of the negative pressure tube 3 extend to the outside of the folding roller 5 and are fixedly connected to a negative pressure suction nozzle 2. Both negative pressure suction nozzles 2 are connected to an external negative pressure device through pipes. An independent negative pressure chamber 6 is defined between the negative pressure tube 3 and the folding roller 5 by a seal, which is used to extract air from the suction holes 71 set on the outer periphery of the folding roller 5. The outer periphery of the folding roller 5 generates an adsorption force to adsorb paper.

[0018] Furthermore, in order to facilitate paper cutting and folding, the folding groove 7 includes a V-shaped groove block 72. The outer periphery of the folding roller 5 is recessed with an installation groove 51. The V-shaped groove block 72 is fixedly installed in the installation groove 51 by fixing bolts. The outer surface of the V-shaped groove block 72 is provided with a V-shaped folding groove 7 position. The inner side of the folding groove 7 position is provided with an adsorption hole 71 that communicates with the negative pressure chamber 6 in the folding roller 5.

[0019] Furthermore, a cutting blade 8 is installed at an adjacent position on each folding groove 7 on the outer periphery of the folding roller 5. A cutting blade groove 52 is provided on the outer periphery of the folding roller 5, and a fixing screw hole 53 perpendicular to the direction of the cutting blade 8 is provided on the side of the cutting blade groove 52. The fixing bolt passes through the fixing screw hole 53 and abuts against the cutting blade 8. The fixing bolt clamps the side of the cutting blade 8 to achieve a secure installation of the cutting blade 8.

[0020] Furthermore, the rotating part 4 includes a rotating bearing. The outer end of the folding roller 5 is rotatably connected to the fixed base 1 via the rotating bearing, and both ends of the inner cavity of the folding roller 5 are rotatably connected to the negative pressure pipe 3 via sealing bearings 54. This ensures the stability of the folding roller 5 during rotation and the sealing of the negative pressure cavity 6.

[0021] Furthermore, two sealing strips 32 are fixedly installed on the outside of the negative pressure tube 3. The outer end face of the sealing strip 32 is in contact with the inner cavity of the folding roller 5. The adsorption hole 71 is located between the two sealing strips 32. The negative pressure tube 3, the sealing strips 32 and the inner cavity of the folding roller 5 form a negative pressure cavity 6. The negative pressure cavity 6 is opposite to a folding groove 7 arranged on the outer periphery of the folding roller 5.

[0022] Furthermore, a brush assembly 33 is fixedly installed on the outer side of the negative pressure pipe 3. The brush assembly 33 is disposed inside the negative pressure chamber 6, and the bristles of the brush assembly 33 are in contact with the inner cavity of the folding roller 5. The brush assembly 33 is used to clean the inner wall of the folding roller 5, prevent impurities such as fiber dust from clogging the adsorption holes 71, and ensure smooth airflow.

[0023] In this invention, a negative pressure tube 3 with a valve core is installed inside a folding roller 5, and negative pressure suction nozzles 2 are installed at both ends of the negative pressure tube 3. By drawing air through an external negative pressure device, a vacuum environment is formed inside the negative pressure tube 3, and a negative pressure chamber 6 is formed inside the negative pressure tube 3 and the folding roller 5. Folding grooves 7 are distributed on the outer surface of the folding roller 5. The folding grooves 7 have suction holes 71 that are connected to the negative pressure chamber 6. When the driving device drives the folding roller 5 to rotate, the negative pressure chamber 6 connects with the suction holes 71 of the folding grooves 7 arranged on the folding roller 5 in sequence, thereby generating an adsorption force on the roller surface and firmly adsorbing the paper into the folding groove. During the subsequent rotation, the cutting blade 8 on the adjacent folding roller 5 will cooperate with the folding groove 7 to complete the cutting of the continuous paper, and achieve precise folding through the alternating action of the two rollers.

[0024] This application achieves a uniform distribution of adsorption force on the roller surface: through the design of symmetrical pressure supply at both ends, negative pressure is supplied simultaneously from both ends of the roller body, which greatly shortens the transmission path of negative pressure and fundamentally eliminates the problem of negative pressure attenuation caused by friction resistance. This ensures that the adsorption force from the middle to both ends of the roller body is highly consistent, and significantly improves the folding accuracy of wide products.

[0025] The negative pressure chamber 6 is isolated by a sealing strip 32, featuring a compact structure and good sealing performance. Both the folding slot 7 and the cutting blade 8 adopt a modular, detachable design for easy replacement, maintenance, and cleaning. The added brush assembly 33 effectively prevents clogging and extends the equipment's service life.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

[0027] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A vacuum constant pressure valve core structure for a folding machine, characterized in that, The machine includes a negative pressure nozzle, a negative pressure tube, a fixed base, a rotating part, and folding rollers. A fixed base is provided on the machine base. Two parallel folding rollers are rotatably mounted on the fixed base via the rotating part. A negative pressure tube is installed inside each folding roller, and the folding rollers and negative pressure tubes are rotatably connected, forming a negative pressure cavity between them. The negative pressure tube is a hollow tube, with both ends connected to the negative pressure nozzle, which is connected to an external negative pressure device. Several suction holes are evenly spaced on the negative pressure tube, and these holes communicate with the negative pressure cavity. A folding groove and a cutting blade are arranged around the outer periphery of each folding roller. The folding groove of one folding roller matches the cutting blade of the adjacent folding roller. The folding groove has suction holes that pass through the folding roller and communicate with the negative pressure cavity. An external drive device is also provided to drive the folding rollers to rotate.

2. The vacuum constant pressure valve core structure for a folding machine according to claim 1, characterized in that, The folding groove includes a V-shaped groove block. The outer periphery of the folding roller is recessed and has an installation groove. The V-shaped groove block is fixedly installed in the installation groove by fixing bolts. The outer surface of the V-shaped groove block is provided with a V-shaped folding groove. The inner side of the folding groove is provided with an adsorption hole that communicates with the negative pressure cavity inside the folding roller.

3. The vacuum constant pressure valve core structure for a folding machine according to claim 1, characterized in that, A cutting blade is installed at an adjacent position of each folding groove on the outer periphery of the folding roller. The outer periphery of the folding roller is provided with a cutting blade groove. A fixing screw hole perpendicular to the direction of the cutting blade is provided on the side of the cutting blade groove. The fixing bolt passes through the fixing screw hole and abuts against the cutting blade.

4. The vacuum constant pressure valve core structure for a folding machine according to claim 1, characterized in that, The rotating part includes a rotating bearing. The outer end of the folding roller is rotatably connected to the fixed seat through the rotating bearing, and the two ends of the inner cavity of the folding roller are also rotatably connected to the negative pressure pipe through sealed bearings.

5. The vacuum constant pressure valve core structure for a folding machine according to claim 1, characterized in that, Two sealing strips are fixedly installed on the outside of the negative pressure tube. The outer end face of the sealing strip is in contact with the inner cavity of the folding roller. The adsorption hole is located between the two sealing strips. The negative pressure tube, the sealing strips and the inner cavity of the folding roller form a negative pressure cavity. The negative pressure cavity is opposite to a folding groove arranged on the outer periphery of the folding roller.

6. The vacuum constant pressure valve core structure for a folding machine according to claim 5, characterized in that, A brush assembly is also fixedly installed on the outer side of the negative pressure pipe. The brush assembly is set inside the negative pressure chamber, and the bristles of the brush assembly are set to abut against the inner cavity of the folding roller.

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