Pressure regulating device for doffing of spinning frame

Abstract

The utility model relates to the technical field of textile equipment, and discloses a pressure regulating device for doffing of a spinning frame, which comprises a main control pressure regulating valve arranged on a main air pipe and a branch pressure regulating valve arranged on a light-load air supply pipeline, and the main control pressure regulating valve is connected with the pressure release valve on the main air pipe through a pressure dynamic regulating mechanism, and the branch pressure regulating valve is connected with the pressure release valve on the light-load air supply pipeline through a pressure dynamic regulating mechanism. According to the utility model, the real-time adjusting rod can monitor and feed back the pressure change of each pipeline in real time, and respectively control the cooperative work of the main control pressure adjusting valve and the pressure release valve on the main air pipe and the cooperative work of the branch pressure adjusting valve and the pressure release valve on the light-load air supply pipeline, so that the independent dynamic adjustment of the pressure of the main air pipe and the light-load air supply pipeline is realized; and the pressure of each part during doffing operation is always in an optimal state, so that the doffing efficiency and reliability of the spinning frame are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of textile equipment technology, and in particular to a pressure regulating device for doffing yarn on a spinning machine. Background Technology

[0002] The ring spinning machine is the main machine for spinning yarn. Doffing is the process of removing all the full bobbins of yarn from the ring spinning machine and placing them in a designated position. When gripping the bobbins, if the gripping pressure is too high, the yarn may be excessively squeezed, resulting in yarn damage or breakage. If the gripping pressure is too low, the yarn may not be firmly gripped, affecting the stability of the doffing process. Therefore, the amount of gripping pressure directly affects the production efficiency and product quality of the ring spinning machine.

[0003] The utility model patent with authorization announcement number CN221141979U discloses a pressure regulating device for doffing on a spinning machine. This device improves the air circuit by setting a branch pressure regulating valve on the light-load air circuit, which can realize the graded supply of output pressure in the heavy-load and light-load air circuits. It can more rationally and accurately regulate and control the working pressure of the entire air supply pipeline, avoid damage to the thin airbag tube gripper, and extend the service life of the thin airbag tube gripper by 30%. However, this device cannot realize real-time dynamic adjustment of the working pressure on the heavy-load and light-load air supply pipelines. As a result, the adaptability of the gripping pressure during the gripping of yarn tubes of different thicknesses is still limited, which affects the doffing efficiency and yarn quality, and urgently needs to be improved. Utility Model Content

[0004] The purpose of this invention is to provide a pressure regulating device for doffing of a ring spinning machine. This device can monitor and provide feedback on the pressure changes of each pipeline in real time by adjusting the lever. It can also control the main control pressure regulating valve and the pressure relief valve on the main air pipe, as well as the branch pressure regulating valve and the pressure relief valve on the light load air supply pipeline, to work together. This enables independent dynamic adjustment of the pressure in the main air pipe and the light load air supply pipeline, ensuring that the pressure of the operating components is always in the optimal state during the doffing operation of each part, thereby effectively improving the doffing efficiency and reliability of the ring spinning machine.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A pressure regulating device for doffing of a spinning machine includes a main control pressure regulating valve installed on the main air pipe and a branch pressure regulating valve installed on the light load air supply pipe. Both the main air pipe and the light load air supply pipe are also equipped with pressure relief valves. The main control pressure regulating valve and the pressure relief valve on the main air pipe, as well as the branch pressure regulating valve and the pressure relief valve on the light load air supply pipe, are all connected by a pressure dynamic adjustment mechanism.

[0007] By adopting the above technical solution, the main control pressure regulating valve on the main air pipe and the branch pressure regulating valve on the light-load air supply line are used to adjust the main air pipe and the light-load air supply line according to the actual working conditions, ensuring the graded supply of output pressure for the heavy-load air supply line and the light-load air supply line. The pressure relief valve is used to release pressure in time when the output pressure of the heavy-load air line and the light-load air line is too high, so as to avoid damage to equipment or products due to overpressure. The pressure dynamic adjustment mechanism is used to monitor and feedback the pressure changes of each line in real time, and control the main control pressure regulating valve and the pressure relief valve on the main air pipe, as well as the branch pressure regulating valve and the pressure relief valve on the light-load air supply line, to work together to achieve independent dynamic adjustment of the pressure of the main air pipe and the light-load air supply line. This ensures that the pressure of the operating components is always in the optimal state during the doffing operation of each part, thereby effectively improving the doffing efficiency and reliability of the spinning machine.

[0008] A further feature of this invention is that the pressure dynamic adjustment mechanism includes a three-way pipe, with both ends of the three-way pipe on the main air pipe connected to the main control regulating valve and the pressure relief valve on the main air pipe, respectively; both ends of the three-way pipe on the light-load air supply pipeline are connected to the branch pressure regulating valve and the pressure relief valve on the light-load air supply pipeline, respectively; and the other ends of the three-way pipes on the main air pipe and the light-load air supply pipeline are respectively provided with dynamic pressure regulating mechanisms for adjusting the pressure on the main air pipe and the light-load air supply pipeline.

[0009] By adopting the above technical solution, the dynamic pressure regulating mechanism is connected to the main control regulating valve and pressure relief valve on the main air pipe or the branch pressure regulating valve and pressure relief valve on the light-load air supply line via a three-way pipe. This enables independent dynamic adjustment and real-time monitoring of the pressure in the main air pipe and the light-load air supply line. When the stage pressure in the main air pipe or the light-load air supply line is too high, the dynamic pressure regulating mechanism controls the pressure relief valve on the main air pipe or the light-load air supply line to release pressure. When the stage pressure in the main air pipe or the light-load air supply line is too low, the dynamic pressure regulating mechanism controls the main control regulating valve on the main air pipe or the branch pressure regulating valve on the light-load air supply line to increase pressure. This ensures that the spinning machine can operate stably under different working conditions, effectively avoids product quality problems caused by pressure fluctuations, and greatly improves the reliability of the equipment.

[0010] A further feature of this invention is that the dynamic pressure regulating mechanism includes a piston with a sealed sliding fit in the inner cavity of the other end of the three-way pipe. A compression spring is provided on the side of the piston away from the main air pipe or the light-load air supply line. A rotating shaft is provided on the other side of the piston and rotatably connected to the three-way pipe. The rotating shaft is perpendicular to the axial direction of the other end of the three-way pipe. A gear is fixedly provided on the rotating shaft, and the gear meshes with a rack fixed on the piston.

[0011] A further feature of this invention is that both ends of the rotating shaft are rotatably and sealed to the three-way pipe body, and one end of the rotating shaft passes through the three-way pipe body and is fixedly provided with a sector gear. When the sector gear rotates, it does not simultaneously mesh with gear one and gear two fixed on the adjusting knob of the main control pressure regulating valve and pressure relief valve or the branch pressure regulating valve and pressure relief valve.

[0012] By adopting the above technical solution, when the pressure changes in the main air pipe or light-load air supply line, the pressure on the piston located at the other end of the three-way pipe changes. Under the action of pressure and the compression spring, the piston slides axially along the other end of the three-way pipe, thereby driving the rack to move synchronously. When the rack moves, it drives the gear meshing with it to rotate. When the gear rotates, it drives the shaft fixedly connected to it to rotate. When the shaft rotates, it drives the sector gear fixedly connected to it to rotate. When the sector gear rotates, it meshes with gear one or gear two, thereby driving gear one or gear two to rotate. When rotated, the adjustment knob of the main control pressure regulating valve (or the branch pressure regulating valve on the light load air supply line) or the pressure relief valve on the main air pipe is turned, thus realizing the adjustment of the opening degree of the main control pressure regulating valve (or the branch pressure regulating valve on the light load air supply line) or the pressure relief valve on the main air pipe. This ensures independent dynamic adjustment and real-time monitoring of the pressure in the main air pipe and the light load air supply line. The structure is simple, easy to operate, and has high control precision and rapid response. It not only improves the stability and safety of the doffing operation of the spinning machine, but also greatly reduces maintenance costs, effectively extends the service life of the equipment, and improves production efficiency.

[0013] A further feature of this invention is that the sector gear is located between gear one and gear two, and the sector gear is tangent to the pitch circles of gear one and gear two.

[0014] By adopting the above technical solution, the sector gear is located between gear one and gear two, ensuring that it does not mesh with gear one and gear two simultaneously when rotating. This ensures that the adjusting knobs on each valve under different pressures can respond independently and work together efficiently, avoiding mutual interference between valves. This further improves the stability and adjustment accuracy of the system, ensuring the precision and consistency of pressure regulation. In addition, the sector gear is tangent to the pitch circles of gear one and gear two, resulting in better meshing smoothness, higher transmission efficiency, less mechanical wear, and longer component life when the sector gear meshes with gear one or gear two.

[0015] A further feature of this invention is that: an adjusting plate is provided at the end of the compression spring away from the piston; the two ends of the compression spring respectively abut against the piston and the adjusting plate; the adjusting plate can slide axially and rotate circumferentially along the other end of the three-way pipe; an adjusting rod is fixedly provided on the side of the adjusting plate away from the compression spring; the adjusting rod passes through the three-way pipe and is threadedly connected to the three-way pipe.

[0016] By adopting the above technical solution, the adjusting rod is used to manually adjust the position of the adjusting plate at the other end of the three-way pipe, thereby realizing the manual adjustment of the initial position of the piston plate. This allows the system to adapt to working conditions with different pressure requirements, ensuring that the initial position of the piston is always in the optimal state under different pressure requirements. When it is necessary to adjust the pressure according to different working conditions, the sector gear is first removed, and then the adjusting rod is rotated to move the position of the piston so that the initial position of the piston matches the working pressure of the pipeline. Then, the sector gear is fixed on the rotating shaft and the center of the sector gear is ensured to coincide with the center of gear one and gear two. When the working pressure of the pipeline changes, the sector gear can quickly drive gear one or gear two to rotate, thereby realizing the instantaneous adjustment of the main control pressure regulating valve or the branch pressure regulating valve.

[0017] A further feature of this invention is that the other end of the three-way tube is provided with an air hole that communicates with the outside on the side of the piston near the compression spring.

[0018] By adopting the above technical solution, the setting of the air hole allows the cavity at the other end of the three-way tube, located on the side of the piston near the compression spring, to be connected to the outside. This effectively reduces the impact of air pressure changes in the cavity on the piston movement when the piston slides along the other end of the three-way tube, and effectively improves the accuracy of pressure regulation.

[0019] A further feature of this invention is that an adjusting handle is fixedly provided at one end of the adjusting rod located outside the three-way pipe.

[0020] By adopting the above technical solution, the adjustment handle is designed to facilitate direct manual operation by the user, greatly increasing the ease of operation.

[0021] A further feature of this invention is that the outer wall of the adjusting rod is provided with a scale for displaying the adjustment distance.

[0022] By adopting the above technical solution, the scale setting makes it easier for operators to accurately grasp the adjustment amount, ensure adjustment accuracy, avoid blindness in the adjustment process, and improve operating efficiency.

[0023] The beneficial effects of this utility model are:

[0024] 1. In this utility model, the main control pressure regulating valve on the main air pipe and the branch pressure regulating valve on the light-load air supply pipeline are used to adjust the main air pipe and the light-load air supply pipeline according to the actual working conditions, ensuring the graded supply of output pressure to the heavy-load air supply pipeline and the light-load air supply pipeline. The pressure relief valve is used to release pressure in time when the output pressure of the heavy-load air circuit and the light-load air circuit is too high, so as to avoid damage to equipment or products due to overpressure. The pressure dynamic adjustment mechanism is used to monitor and feedback the pressure changes of each pipeline in real time, and control the main control pressure regulating valve and the pressure relief valve on the main air pipe, as well as the branch pressure regulating valve and the pressure relief valve on the light-load air supply pipeline, to work together to achieve independent dynamic adjustment of the pressure of the main air pipe and the light-load air supply pipeline, ensuring that the pressure of the operating components is always in the optimal state during the doffing operation of each part, thereby effectively improving the doffing efficiency and reliability of the spinning machine.

[0025] 2. The dynamic pressure regulating mechanism in this utility model has a simple structure, is easy to operate, has high control precision, and responds quickly. It not only improves the stability and safety of the doffing operation of the spinning machine, but also greatly reduces maintenance costs, effectively extends the service life of the equipment, and improves production efficiency.

[0026] 3. In this utility model, the sector gear is located between gear one and gear two, ensuring that it does not mesh with gear one and gear two simultaneously when rotating. This ensures that the adjusting knobs on each valve under different pressures can respond independently and work together efficiently, avoiding mutual interference between valves. This further improves the stability and adjustment accuracy of the system, ensuring the precision and consistency of pressure regulation. In addition, the sector gear is tangent to the pitch circles of gear one and gear two, resulting in better meshing smoothness, higher transmission efficiency, less mechanical wear, and longer component life when the sector gear meshes with gear one or gear two.

[0027] 4. In this utility model, the adjusting rod is used to manually adjust the position of the adjusting plate at the other end of the three-way pipe, thereby realizing the manual adjustment of the initial position of the piston plate. This allows the system to adapt to different working pressure requirements and ensures that the initial position of the piston is always in the optimal state under different pressure requirements. When it is necessary to adjust the pressure according to different working conditions, the sector gear is first removed, and then the adjusting rod is rotated to move the position of the piston so that the initial position of the piston matches the working pressure of the pipeline. Then, the sector gear is fixed on the rotating shaft and the center of the sector gear is ensured to coincide with the center of gear one and gear two. When the working pressure of the pipeline changes, the sector gear can quickly drive gear one or gear two to rotate, thereby realizing the instantaneous adjustment of the main control pressure regulating valve or the branch pressure regulating valve.

[0028] 5. The air hole in this utility model allows the cavity at the other end of the three-way tube, located on the side of the piston near the compression spring, to communicate with the outside, thereby effectively reducing the impact of air pressure changes in the cavity on the piston movement when the piston slides along the other end of the three-way tube, and effectively improving the accuracy of pressure regulation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the external structure of a pressure regulating device for doffing a spinning machine according to this utility model.

[0031] Figure 2 This is a schematic diagram of the internal structure of the three-way pipe and the dynamic pressure regulating mechanism in a doffing pressure regulating device for a spinning machine according to this utility model.

[0032] In the diagram: 1. Main air pipe; 2. Main control pressure regulating valve; 3. Light load air supply pipeline; 4. Branch pressure regulating valve; 5. Pressure relief valve; 6. Dynamic pressure adjustment mechanism; 61. T-shaped pipe body; 7. Dynamic pressure adjustment mechanism; 71. Piston; 72. Compression spring; 73. Rotary shaft; 74. Gear; 75. Rack; 76. Gear 1; 77. Gear 2; 78. Adjusting plate; 79. Adjusting rod; 70. Sector gear; 8. Adjusting knob; 9. Air port; 10. Adjusting handle. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] like Figures 1-2 As shown, a pressure regulating device for doffing of a spinning machine includes a main control pressure regulating valve 2 installed on the main air pipe 1 and a branch pressure regulating valve 4 installed on the light load air supply line 3. Both the main air pipe 1 and the light load air supply line 3 are also equipped with pressure relief valves 5. The main control pressure regulating valve 2 and the pressure relief valve 5 on the main air pipe 1, as well as the branch pressure regulating valve 4 and the pressure relief valve 5 on the light load air supply line 3, are all connected by a pressure dynamic adjustment mechanism 6.

[0035] Furthermore, the pressure dynamic adjustment mechanism 6 includes a three-way pipe body 61. The two ends of the three-way pipe body 61 on the main air pipe 1 are respectively connected to the main control regulating valve 2 and the pressure relief valve 5 on the main air pipe 1. The two ends of the three-way pipe body 61 on the light load air supply line 3 are respectively connected to the branch pressure regulating valve 4 and the pressure relief valve 5 on the light load air supply line 3. The other ends of the three-way pipe bodies 61 on the main air pipe 1 and the light load air supply line 3 are respectively provided with dynamic pressure regulating mechanisms 7 for adjusting the pressure on the main air pipe 1 and the light load air supply line 3.

[0036] Furthermore, the dynamic pressure regulating mechanism 7 includes a piston 71 that is slidably fitted to the inner cavity of the other end of the three-way pipe 61. A compression spring 72 is provided on the side of the piston 71 away from the main air pipe 1 or the light-load air supply line 3. A rotating shaft 73 is rotatably connected to the three-way pipe 61 on the other side of the piston 71. The rotating shaft 73 is perpendicular to the axial direction of the other end of the three-way pipe 61. A gear 74 is fixedly provided on the rotating shaft 73. The gear 74 meshes with a rack 75 fixed on the piston 71.

[0037] Furthermore, both ends of the rotating shaft 73 are sealed and rotatably connected to the three-way pipe body 61. One end of the rotating shaft 73 passes through the three-way pipe body 61 and is fixedly provided with a sector gear 70. When the sector gear 70 rotates, it does not simultaneously mesh with gear one 76 and gear two 77 fixed on the adjusting knob 8 of the main control pressure regulating valve 2 and pressure relief valve 5 or the branch pressure regulating valve 4 and pressure relief valve 5.

[0038] Furthermore, the sector gear 70 is located between gear one 76 and gear two 77, and the sector gear 70 is tangent to the pitch circles of gear one 76 and gear two 77.

[0039] Furthermore, an adjusting plate 78 is provided at the end of the compression spring 72 away from the piston 71. The two ends of the compression spring 72 abut against the piston 71 and the adjusting plate 78 respectively. The adjusting plate 78 can slide axially and rotate circumferentially along the other end of the three-way tube 61. An adjusting rod 79 is fixedly provided on the side of the adjusting plate 78 away from the compression spring 72. The adjusting rod 79 passes through the three-way tube 61 and is threadedly connected to the three-way tube 61.

[0040] Furthermore, the other end of the three-way tube 61 is provided with an air hole 9 that communicates with the outside on the side of the piston 71 near the compression spring 72.

[0041] Furthermore, an adjustment handle 10 is fixedly provided at one end of the adjusting rod 79 located outside the three-way pipe body 61.

[0042] Furthermore, the outer wall of the adjusting rod 79 is provided with a scale for displaying the adjustment distance.

[0043] The working principle of this utility model is as follows: The main control pressure regulating valve 2 on the main air pipe 1 and the branch pressure regulating valve 4 on the light load air supply pipeline 3 are used to adjust the main air pipe 1 and the light load air supply pipeline 3 according to the actual working conditions, ensuring the graded supply of output pressure of the heavy load air supply pipeline and the light load air supply pipeline 3. The pressure relief valve 5 is used to release pressure in time when the output pressure of the heavy load air circuit and the light load air circuit is too high, so as to avoid overpressure causing damage to equipment or products. The pressure dynamic adjustment mechanism 6 is used to monitor and feedback the pressure changes of each pipeline in real time, and control the main control pressure regulating valve 2 and the pressure relief valve 5 on the main air pipe 1, as well as the branch pressure regulating valve 4 and the pressure relief valve 5 on the light load air supply pipeline 3, to work together to realize the independent dynamic adjustment of the pressure of the main air pipe 1 and the light load air supply pipeline 3, ensuring that the pressure of the operating components is always in the best state during the doffing operation of each part, thereby effectively improving the doffing efficiency and reliability of the spinning machine.

[0044] When the pressure changes in the main air pipe 1 or the light-load air supply line 3, the pressure on the piston 71 located at the other end of the three-way pipe body 61 changes. Under the pressure and the compression spring 72, the piston 71 slides axially along the other end of the three-way pipe body 61, thereby driving the rack 75 to move synchronously. When the rack 75 moves, it drives the gear 74 meshing with it to rotate. When the gear 74 rotates, it drives the rotating shaft 73 fixedly connected to it to rotate. When the rotating shaft 73 rotates, it drives the sector gear 70 fixedly connected to it to rotate. When the sector gear 70 rotates, it meshes with gear one 76 or gear two 77, thereby driving gear one 76 or gear two 77 to rotate. When wheel 1 (76) or gear 2 (77) rotates, it drives the adjustment knob 8 of the main control pressure regulating valve 2 on the main air pipe 1 or the branch pressure regulating valve 4 or the pressure relief valve 5 on the light load air supply line 3 to rotate. This realizes the adjustment of the opening degree of the main control pressure regulating valve 2 on the main air pipe 1 or the branch pressure regulating valve 4 or the pressure relief valve 5 on the light load air supply line 3, ensuring independent dynamic adjustment and real-time monitoring of the pressure of the main air pipe 1 and the light load air supply line 3. The structure is simple, the operation is convenient, and the control accuracy is high and the response is fast. It not only improves the stability and safety of the doffing operation of the spinning machine, but also greatly reduces the maintenance cost, effectively extends the service life of the equipment, and improves the production efficiency.

[0045] When pressure needs to be adjusted according to different working conditions, the sector gear 70 is removed, and then the adjusting rod 79 is rotated to move the position of the piston 71. When the adjusting rod 79 rotates, it will drive the adjusting plate 78 to move. When the adjusting plate 78 moves, it will cause the piston 71 to move synchronously, thereby adjusting the initial position of the piston 71 and ensuring that the initial position of the piston 71 matches the working pressure of the pipeline. Then, the sector gear 70 is fixed on the rotating shaft 73 and the center of the sector gear 70 is made to coincide with the center of gear 1 76 and gear 2 77. This allows the sector gear 70 to quickly drive gear 1 76 or gear 2 77 to rotate when the working pressure of the pipeline changes, thereby realizing the instantaneous adjustment of the main control pressure regulating valve 2 or the branch pressure regulating valve 4.

Claims

1. A pressure regulating device for doffing of a spinning machine, comprising a main control pressure regulating valve (2) installed on the main air pipe (1) and a branch pressure regulating valve (4) installed on the light load air supply pipe (3), characterized in that: The main air pipe (1) and the light-load air supply line (3) are also equipped with pressure relief valves (5). The main control pressure regulating valve (2) and the pressure relief valve (5) on the main air pipe (1) and the branch pressure regulating valve (4) and the pressure relief valve (5) on the light-load air supply line (3) are all connected by a pressure dynamic adjustment mechanism (6).

2. The pressure regulating device for doffing of a spinning frame according to claim 1, characterized in that: The pressure dynamic adjustment mechanism (6) includes a three-way pipe (61). The two ends of the three-way pipe (61) on the main air pipe (1) are respectively connected to the main control regulating valve (2) and the pressure relief valve (5) on the main air pipe (1). The two ends of the three-way pipe (61) on the light load air supply pipeline (3) are respectively connected to the branch pressure regulating valve (4) and the pressure relief valve (5) on the light load air supply pipeline (3). The other end of the three-way pipe (61) on the main air pipe (1) and the light load air supply pipeline (3) is respectively provided with a dynamic pressure regulating mechanism (7) for regulating the pressure on the main air pipe (1) and the light load air supply pipeline (3).

3. The pressure regulating device for doffing of a spinning frame according to claim 2, characterized in that: The dynamic pressure regulating mechanism (7) includes a piston (71) with a sealed sliding fit in the inner cavity of the other end of the three-way pipe (61). A compression spring (72) is provided on the side of the piston (71) away from the main air pipe (1) or the light-load air supply line (3). A rotating shaft (73) is rotatably connected to the three-way pipe (61) on the other side of the piston (71). The rotating shaft (73) is perpendicular to the axial direction of the other end of the three-way pipe (61). A gear (74) is fixed on the rotating shaft (73). The gear (74) meshes with a rack (75) fixed on the piston (71).

4. The pressure regulating device for doffing of a spinning frame according to claim 3, characterized in that: Both ends of the rotating shaft (73) are sealed and rotatably connected to the three-way pipe body (61). One end of the rotating shaft (73) passes through the three-way pipe body (61) and is fixedly provided with a sector gear (70). When the sector gear (70) rotates, it does not simultaneously mesh with gear one (76) and gear two (77) fixed on the adjusting knob (8) of the main control pressure regulating valve (2) and pressure relief valve (5) or the branch pressure regulating valve (4) and pressure relief valve (5).

5. The pressure regulating device for doffing of a spinning frame according to claim 4, characterized in that: The sector gear (70) is located between gear one (76) and gear two (77), and the sector gear (70) is tangent to the pitch circles of gear one (76) and gear two (77).

6. The pressure regulating device for doffing of a spinning frame according to claim 5, characterized in that: The compression spring (72) is provided with an adjusting plate (78) at one end away from the piston (71). The two ends of the compression spring (72) abut against the piston (71) and the adjusting plate (78) respectively. The adjusting plate (78) can slide axially and rotate circumferentially along the other end of the three-way tube (61). An adjusting rod (79) is fixedly provided on the side of the adjusting plate (78) away from the compression spring (72). The adjusting rod (79) passes through the three-way tube (61) and is threadedly connected to the three-way tube (61).

7. A pressure regulating device for doffing on a spinning frame according to claim 6, characterized in that: The other end of the three-way tube (61) is located on the side of the piston (71) near the compression spring (72) and has an air hole (9) that communicates with the outside.

8. A pressure regulating device for doffing on a spinning frame according to claim 7, characterized in that: The adjusting rod (79) is fixedly provided with an adjusting handle (10) at one end outside the three-way pipe body (61).

9. A pressure regulating device for doffing on a spinning frame according to claim 8, characterized in that: The outer wall of the adjusting rod (79) is provided with a scale for displaying the adjustment distance.

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