Pneumatic rotating joint of printing machine rolling shaft

Abstract

The utility model relates to the technical field of rolling shafts, and discloses a pneumatic rotary joint of a printing machine rolling shaft, which comprises a first joint fixedly connected with an air cylinder pipeline and a second joint fixedly connected with an air source pipeline, the first joint and the second joint are hinged with each other, and the first joint can synchronously rotate along with the rolling shaft; the pneumatic rotary joint further comprises a limiting block, and the limiting block is provided with a limiting groove used for containing the second joint. According to the pneumatic rotary joint, through the design of introducing the limiting block and the limiting groove, the pulling effect of an air source pipeline on the second joint is effectively isolated, the stability and the reliability of the pneumatic rotary joint are guaranteed, damage or performance reduction caused by pulling is avoided, and the operation efficiency and the safety of a printing machine are improved.

Description

Technical Field

[0001] This utility model relates to the field of winding shaft technology, specifically a pneumatic rotary joint for a printing press winding shaft. Background Technology

[0002] In fields such as bag making and product packaging, there is a need to print patterns on film materials in batches. The printing press drives the take-up shaft 1 to rotate, wind, or unwind the film material. For example... Figure 1 As shown, a cylinder-driven clamp 2 is typically installed on the power shaft of a printing press. The clamp 2 expands or contracts radially to act on the take-up shaft 1, thereby achieving coaxial fixation between the take-up shaft 1 and the power shaft. The cylinder rotates synchronously with the power shaft, while the air source is stationary; therefore, a pneumatic rotary joint is needed to connect the pipelines of both.

[0003] like Figure 2 As shown, the two ends of the traditional connector 6 are hinged together, and the hinged part adopts a graphite sealing structure 3. When the printing machine is running, one end of the connector rotates with the cylinder pipe 4, and the other end is often subjected to the pulling action of the air source pipe 5, which will apply radial load (or shear force) to the connector. Long-term use will aggravate the wear of the graphite sealing structure 3, causing air leakage. In addition, the maintenance cost is high, which further limits its mass application in the printing production line. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides a pneumatic rotary joint for the winding shaft of a printing press, which can reduce wear during operation and extend service life.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses a pneumatic rotary joint for a printing press take-up shaft, including a first joint for fixed connection with a cylinder pipeline and a second joint for fixed connection with an air source pipeline. The two are hinged to each other, and the first joint can rotate synchronously with the take-up shaft. The pneumatic rotary joint also includes a limiting block with a limiting groove for accommodating the second joint, thereby isolating the pulling force of the air source pipeline on the second joint.

[0007] As a further improvement to the above solution, the take-up shaft is mounted on the printing press housing and can rotate relative to the housing; the limit block is fixedly connected to the housing.

[0008] As a further improvement to the above scheme, the projection of the limiting groove in a vertical plane is U-shaped and has two opposing sidewalls. The distance between the two sidewalls is not less than the maximum diameter of the second connector; the vertical plane is perpendicular to the axis of the take-up shaft.

[0009] As a further improvement of the above scheme, a buffer layer is arranged on each side wall of the limiting groove for abutting the outer side of the second joint, and the buffer layer is made of rubber, sponge or EVA foam structure.

[0010] As a further improvement of the above scheme, the limiting block is fixedly connected to the machine shell by bolts.

[0011] As a further improvement of the above scheme, a gas passage is further arranged on the limiting block, an inlet of the gas passage is communicated with the gas source pipeline, and an outlet of the gas passage is communicated with the second joint in the limiting groove.

[0012] As a further improvement of the above scheme, the first joint is a straight pipe, and the second joint is a 90° elbow pipe, which are hingedly connected to form an L-shaped bending structure.

[0013] As a further improvement of the above scheme, when the second joint is threadedly connected to the outlet of the gas passage, the other end of the second joint and the straight pipe section both extend out of the limiting groove, so as to facilitate the rotary installation of the second joint.

[0014] As a further improvement of the above scheme, the first joint and the second joint are hingedly connected through mechanical sealing.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model introduces the design of the limiting block and the limiting groove, effectively isolates the pulling effect of the gas source pipeline on the second joint, guarantees the stability and reliability of the pneumatic rotary joint, avoids damage or performance decline caused by pulling, and improves the operation efficiency and safety of the printing machine.

[0017] 2. The design of the limiting groove of the utility model considers the maximum diameter of the second joint, ensures the free movement of the second joint in the limiting groove without being extruded or limited by the side wall. This design not only guarantees the smooth rotation of the joint, but also avoids damage caused by friction or jamming, prolongs the service life of the pneumatic rotary joint.

[0018] 3. The utility model designs the joint as an L-shaped bending structure, which is not only convenient for installation and debugging, but also can effectively reduce the space occupation. DETAILED DESCRIPTION

[0019] Figure 1 The partial structure diagram of the traditional joint installed on the winding machine.

[0020] Figure 2 The Figure 1 The three-dimensional structure diagram of the traditional joint, the cylinder pipeline and the gas source pipeline.

[0021] Figure 3The utility model discloses a preferable embodiment of the utility model three-dimensional structure schematic diagram of pneumatic rotary joint installation on the winding machine.

[0022] Figure 4 For Figure 3 The utility model discloses a preferable embodiment three-dimensional joint schematic diagram of pneumatic rotary joint, cylinder pipeline and gas source pipeline.

[0023] Figure 5 For the three-dimensional assembly schematic diagram of first joint and second joint in the preferable embodiment of the utility model.

[0024] Figure 6 For Figure 3 The utility model discloses a preferable embodiment three-dimensional joint schematic diagram of limiting block.

[0025] In the drawing: 1, winding shaft;2, clamp;3, graphite sealing structure;4, cylinder pipeline;5, gas source pipeline;6, traditional joint;70, limiting block;701, limiting groove;702, gas passage;71, first joint;72, second joint;8, machine shell;9, buffer layer;10, bolt. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the range protected by the utility model.

[0027] Please refer to Figures 3 to 6 The utility model discloses a kind of pneumatic rotary joints of printing machine winding shaft, including limiting block 70, first joint 71 and second joint 72.

[0028] Winding shaft 1 is arranged on the machine shell 8 of printing machine, and can generate rotation relative to machine shell 8.It needs to be explained, machine shell 8 can be the shell of driving motor of power shaft, can also be other mechanisms of printing machine, for example, base, support frame etc., as long as it is relatively static with ground when equipment runs.

[0029] First joint 71 is used to and cylinder pipeline 4 fixed connection, first joint 71 can rotate synchronously with winding shaft 1;Second joint 72 is used to and gas source pipeline 5 fixed connection.First joint 71 and second joint 72 are hinged to each other, can be realized hinged through traditional graphite sealing structure;Can also adopt existing more advanced high-speed rotary joint, and hinged is realized through mechanical seal.

[0030] In the embodiment, first joint 71 is straight pipe, and second joint 72 is 90 ° elbow pipe, and are hinged to each other to constitute L-shaped bending structure.

[0031] The limiting block 70 can be fixedly connected to the shell 8 by the bolt 10. The limiting block 70 is provided with a limiting groove 701 for accommodating the second joint 72. Through the hinged structure of the first joint 71 and the second joint 72, the function of synchronous rotation of the first joint 71 with the winding shaft 1 is realized. In particular, the design of the limiting block 70 and the limiting groove 701 effectively isolates the pulling effect of the gas source pipeline 5 on the second joint 72, ensuring the stability and reliability of the pneumatic rotary joint, avoiding damage or performance degradation caused by pulling, and improving the operation efficiency and safety of the printing machine.

[0032] In this embodiment, the projection of the limiting groove 701 in a vertical plane is in the shape of a "concave" character, and has two opposite side walls, the distance between the two side walls is not less than the maximum diameter of the second joint 72; the vertical plane is perpendicular to the axis of the winding shaft 1. The design of the limiting groove 701 takes into account the maximum diameter of the second joint 72, ensuring the free movement of the second joint 72 in the limiting groove 701 without being squeezed or limited by the side walls. This design not only ensures the smooth rotation of the joint, but also avoids damage caused by friction or jamming, prolonging the service life of the pneumatic rotary joint.

[0033] In some embodiments, a buffer layer 9 can also be provided on each side wall of the limiting groove 701 for abutting the outside of the second joint 72, and the buffer layer 9 is made of rubber, sponge or EVA foam structure. The introduction of the buffer layer 9 reduces the direct contact between the second joint 72 and the side wall of the limiting groove 701, reduces friction and wear, and further improves the durability and stability of the pneumatic rotary joint. At the same time, the buffer layer 9 can also play a role in shock absorption and noise reduction, improving the working environment.

[0034] A gas passage 702 can also be provided on the limiting block 70, the inlet of the gas passage 702 is used for communication with the gas source pipeline 5, and the outlet of the gas passage 702 is used for communication with the second joint 72 in the limiting groove 701, thereby realizing the indirect communication between the gas source pipeline 5 and the second joint 72. On the one hand, it ensures the efficiency and stability of gas transmission, and on the other hand, when the gas source pipeline 5 is pulled, the object of action is the limiting block 70 rather than the pneumatic rotary joint, thereby further reducing the wear of the joint hinged part.

[0035] One end of the second joint 72 can be threadedly connected to the outlet of the gas passage 702, and the other end of the second joint 72 and the straight pipe segment are both extended out of the limiting groove 701, so as to facilitate the rotary installation of the second joint 72. The size of the limiting block 70 can be set according to the needs, that is, the length of the two side extensions constituting the limiting groove 701. The L-shaped bending structure facilitates installation and debugging, and can also effectively reduce the space occupation.

[0036] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A pneumatic rotary joint for a printing press take-up shaft, comprising a first joint (71) for fixed connection to a cylinder line (4) and a second joint (72) for fixed connection to an air source line (5), the two being hinged to each other, and the first joint (71) being able to rotate synchronously with the take-up shaft (1); characterized in that, It also includes a limiting block (70), which has a limiting groove (701) for accommodating the second connector (72) to isolate the pulling effect of the gas source pipeline (5) on the second connector (72).

2. The pneumatic rotary joint for a printing press take-up shaft according to claim 1, characterized in that, The take-up shaft (1) is mounted on the housing (8) of the printing press and can rotate relative to the housing (8); the limiting block (70) is fixedly connected to the housing (8).

3. The pneumatic rotary joint for a printing press take-up shaft according to claim 1, characterized in that, The projection of the limiting groove (701) in a vertical plane is in the shape of a concave "U" and has two opposing side walls. The distance between the two side walls is not less than the maximum diameter of the second connector (72). The vertical plane is perpendicular to the axis of the take-up shaft (1).

4. The pneumatic rotary joint for a printing press take-up shaft according to claim 3, characterized in that, Each sidewall of the limiting groove (701) is provided with a buffer layer (9) for fitting against the outside of the second connector (72). The buffer layer (9) is made of rubber, sponge or EVA foam.

5. A pneumatic rotary joint for a printing press take-up shaft according to claim 2, characterized in that, The limiting block (70) is fixedly connected to the housing (8) by bolts (10).

6. A pneumatic rotary joint for a printing press take-up shaft according to any one of claims 1 to 5, characterized in that, The limiting block (70) is also provided with a gas channel (702). The inlet of the gas channel (702) is used to connect with the gas source pipeline (5), and the outlet of the gas channel (702) is used to connect with the second connector (72) in the limiting groove (701).

7. A pneumatic rotary joint for a printing press take-up shaft according to claim 6, characterized in that, The first connector (71) is a straight tube, and the second connector (72) is a 90° bent tube, which are hinged together to form an L-shaped bending structure.

8. A pneumatic rotary joint for a printing press take-up shaft (1) according to claim 7, characterized in that, When one end of the second connector (72) is threaded to the outlet of the gas channel (702), the other end of the second connector (72) and the straight pipe section extend out of the limiting groove (701) to facilitate the rotational installation of the second connector (72).

9. A pneumatic rotary joint for a printing press take-up shaft according to any one of claims 1 to 5, characterized in that, The first joint (71) and the second joint (72) are hinged by a mechanical seal.

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