A pneumatic feeding flour mill

Abstract

This utility model relates to a pneumatically fed grinding device, comprising a housing, a feeding roller, a grinding roller, a belt drive mechanism, and a pneumatic clutch. A torsion spring buffer assembly is provided between the output end of the pneumatic clutch and the input end of the feeding roller. The torsion spring buffer assembly consists of an annular inner shell and an annular outer shell forming an annular spring cavity, with a pre-compressed torsion spring inside. The two ends of the spring are engaged with the inner and outer shells, which can effectively absorb the high-intensity impact force at the moment of engagement of the pneumatic clutch and convert it into the elastic deformation energy of the torsion spring. This significantly reduces the periodic stress concentration transmitted to the input shaft of the feeding roller, avoiding fatigue fracture of the shaft. At the same time, this mechanical buffer mechanism can automatically reset without external control, reducing the equipment failure rate and maintenance frequency, extending the service life of the feeding roller and the entire grinding device, and ensuring production continuity and stability. It improves equipment reliability while reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the technical field of grinding mill clutch mechanism, and in particular to a pneumatic feeding grinding device. Background Technology

[0002] Although existing pneumatic feeding grinding devices use pneumatic clutches to replace traditional jaw clutches to improve feeding control, the huge impact force generated at the moment of engagement of the pneumatic clutch is directly transmitted to the input end of the feed roller, causing the feed roller bearing to suffer periodic stress concentration and frequent fracture failures. This problem is particularly prominent in grinding equipment that has been operating for a long time, which not only increases maintenance costs but also seriously affects the continuity of production.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a pneumatically fed grinding device to solve the problem that the huge impact force generated at the moment of engagement of the pneumatic clutch is directly transmitted to the input end of the feed roller, causing the feed roller bearing to suffer periodic stress concentration and frequent breakage failure.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A pneumatically fed grinding device, characterized in that it comprises:

[0007] Chassis;

[0008] The feed roller is rotatably mounted on the housing;

[0009] The grinding roller is rotatably mounted inside the housing;

[0010] A belt drive mechanism is movably mounted on the chassis;

[0011] A pneumatic clutch is drivenly connected to the feed roller and is coaxially disposed at one end of the feed roller. The pneumatic clutch is synchronously driven to the grinding roller via a belt drive mechanism. A torsion spring buffer assembly is disposed between the output end of the pneumatic clutch and the input end of the feed roller. The torsion spring buffer assembly includes a coaxially sleeved annular inner shell and an annular outer shell. The annular inner shell is fixedly connected to the output end of the pneumatic clutch, and the annular outer shell is fixedly connected to the output end of the feed roller. An annular spring cavity is formed between the annular outer shell and the annular inner shell. A pre-compression torsion spring is disposed in the annular spring cavity, and the two ends of the pre-compression torsion spring are respectively engaged with the annular inner shell and the annular outer shell.

[0012] A further technical solution is that the torsion spring buffer assembly also includes a limiting pawl, which is disposed on the inner wall of the annular outer shell. When the annular inner shell rotates relative to the annular outer shell by an angle exceeding a preset angle value, the limiting pawl is locked in the groove on the annular inner shell.

[0013] A further technical solution is that the pre-compression torque of the pre-compression torsion spring is 10%-30% of the rated load torque of the grinding roller.

[0014] A further technical solution is that the preset angle value is 15°-25°, and at least 6 grooves are evenly distributed around the annular inner shell.

[0015] A further technical solution is that the belt drive mechanism includes a feed roller pulley and a grinding roller pulley; the feed roller pulley is rotatably sleeved on the feed roller, the annular outer shell is fixedly connected to the feed roller pulley, the feed roller pulley is drive-connected to the feed roller, and the feed roller pulley is located at the pneumatic clutch; the grinding roller pulley is rotatably sleeved on the grinding roller, and the grinding roller pulley is drive-connected to the grinding roller.

[0016] A further technical solution is that the belt drive mechanism further includes a tensioning pulley; a tensioning pulley bracket is provided on the housing; the tensioning pulley is rotatably mounted on the tensioning pulley bracket via a tensioning pulley shaft; the feed roller pulley, the grinding roller pulley, and the tensioning pulley are connected by belt drive.

[0017] A further technical solution is that the belt drive mechanism further includes a positioning sleeve; the positioning sleeve is sleeved on the grinding roller, and one end of the grinding roller pulley is located inside one end of the positioning sleeve.

[0018] A further technical solution is that the belt drive mechanism further includes a rotating bearing; the rotating bearing is sleeved on the grinding roller, and bearing end caps are provided at both ends of the rotating bearing, with the other end of the positioning sleeve located inside the bearing end caps.

[0019] The beneficial effects of this utility model embodiment are as follows:

[0020] (i) A pneumatically fed grinding device includes a housing, a feeding roller, a grinding roller, a belt drive mechanism, and a pneumatic clutch. A torsion spring buffer assembly is provided between the output end of the pneumatic clutch and the input end of the feeding roller. The torsion spring buffer assembly is formed by an annular inner shell and an annular outer shell to form an annular spring cavity. The two ends of the pre-compressed torsion spring are engaged with the inner and outer shells, which can effectively absorb the high-intensity impact force at the moment of engagement of the pneumatic clutch and convert it into the elastic deformation energy of the torsion spring. This significantly reduces the periodic stress concentration transmitted to the input shaft of the feeding roller and avoids fatigue fracture of the shaft. At the same time, this mechanical buffer mechanism can automatically reset without external control, reducing the equipment failure rate and maintenance frequency, extending the service life of the feeding roller and the entire grinding device, and ensuring production continuity and stability. It improves equipment reliability while reducing maintenance costs.

[0021] (ii) Furthermore, the torsion spring buffer assembly also includes a limiting pawl, which is disposed on the inner wall of the annular outer shell. When the rotation angle of the inner annular shell relative to the outer shell exceeds a preset angle value, the limiting pawl locks into a groove on the inner annular shell. The preset angle value is 15°-25°, and there are at least 6 grooves evenly distributed around the circumference of the inner annular shell. When the relative rotation of the inner annular shell and the outer shell does not reach the preset angle of 15°-25°, the pre-compressed torsion spring continues to elastically deform to absorb the impact. Once the angle is exceeded, the pawl immediately embeds into the evenly distributed grooves to form a rigid lock, ensuring that the torque is transmitted to the feed roller under high load conditions. At the same time, the design of at least 6 grooves evenly distributed around the circumference allows the pawl to quickly engage at any rotation phase, completely eliminating transmission lag. Attached Figure Description

[0022] Figure 1 This is a front view of the internal structure of a pneumatically fed grinding device according to the present invention.

[0023] Figure 2 for Figure 1 Enlarged view at point A.

[0024] Figure 3 This is a side view of the torsion spring buffer assembly in a pneumatically fed grinding device according to this utility model.

[0025] In the picture:

[0026] 100. Chassis; 200. Feed roller; 300. Grinding roller; 400. Belt drive mechanism; 410. Feed roller pulley; 420. Grinding roller pulley; 430. Tensioner; 440. Tensioner bracket; 450. Tensioner shaft; 460. Positioning sleeve; 470. Rotary bearing; 480. Bearing end cover; 500. Pneumatic clutch; 600. Torsion spring buffer assembly; 610. Annular inner shell; 611. Groove; 620. Annular outer shell; 630. Annular spring cavity; 640. Pre-compressed torsion spring; 650. Limiting pawl. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0028] First embodiment:

[0029] like Figure 1 As shown, a pneumatically fed grinding device includes a housing 100, a feeding roller 200, a grinding roller 300, a belt drive mechanism 400, and a pneumatic clutch 500. The feeding roller 200 is rotatably mounted on the housing 100. The grinding roller 300 is rotatably mounted inside the housing 100. The belt drive mechanism 400 is movably mounted on the housing 100. Exemplarily, the belt drive mechanism 400 includes a feeding roller pulley 410 and a grinding roller pulley 420. The feeding roller pulley 410 is rotatably mounted on the feeding roller 200 and is drively connected to the feeding roller 200. An annular housing 620 is fixedly connected to the feeding roller pulley 410, and the feeding roller pulley 410 is located at the pneumatic clutch 500. The grinding roller pulley 420 is rotatably mounted on the grinding roller 300 and is drively connected to the grinding roller 300. The belt drive mechanism 400 also includes a rotating bearing 470. The rotating bearing 470 is sleeved on the grinding roller 300, and bearing end caps 480 are provided at both ends of the rotating bearing 470. The other end of the positioning sleeve 460 is located inside the bearing end cap 480.

[0030] like Figure 2 As shown, a pneumatic clutch 500 is driven by the feed roller 200, and the pneumatic clutch 500 is coaxially disposed at one end of the feed roller 200. The pneumatic clutch 500 is synchronously driven by the grinding roller 300 through a belt drive mechanism 400. A torsion spring buffer assembly 600 is disposed between the output end of the pneumatic clutch 500 and the input end of the feed roller 200. The torsion spring buffer assembly 600 includes an annular inner shell 610 and an annular outer shell 620 coaxially sleeved. The annular inner shell 610 is fixedly connected to the output end of the pneumatic clutch 500, and the annular outer shell 620 is fixedly connected to the output end of the feed roller 200. An annular spring cavity 630 is formed between the annular outer shell 620 and the annular inner shell 610. A pre-compression torsion spring 640 is disposed in the annular spring cavity 630, and the two ends of the pre-compression torsion spring 640 are respectively engaged with the annular inner shell 610 and the annular outer shell 620. For example, the pre-compression torque of the pre-compression torsion spring 640 is 10%-30% of the rated load torque of the grinding roller 300.

[0031] like Figures 2-3As shown, the torsion spring buffer assembly 600 further includes a limiting pawl 650, which is disposed on the inner wall of the annular outer shell 620. When the rotation angle of the annular inner shell 610 relative to the annular outer shell 620 exceeds a preset angle value, the limiting pawl 650 locks into the groove 611 on the annular inner shell 610. For example, the preset angle value is 15°-25°, and at least six grooves 611 are evenly distributed around the annular inner shell 610. When the relative rotation of the annular inner shell 610 and the outer shell does not reach the preset angle of 15°-25°, the pre-compressed torsion spring 640 continues to elastically deform to absorb the impact. Once the angle is exceeded, the pawl immediately engages with the evenly distributed grooves 611 to form a rigid lock, ensuring that the torque is transmitted to the feed roller 200 under high load conditions. At the same time, the design of at least six circumferentially distributed grooves 611 allows the pawl to quickly engage at any rotational phase, completely eliminating transmission lag.

[0032] like Figure 1 As shown, the belt drive mechanism 400 further includes a tensioning pulley 430. A tensioning pulley bracket 440 is provided on the housing 100. The tensioning pulley 430 is rotatably mounted on the tensioning pulley bracket 440 via a tensioning pulley shaft 450. The feed roller pulley 410, the grinding roller pulley 420, and the tensioning pulley 430 are connected by a belt drive. When the belt becomes stretched and loose due to long-term operation, the tensioning pulley bracket 440 can be manually or automatically adjusted to force the tensioning pulley 430 to press against the inner side of the belt, compensating for the belt elongation. This eliminates the risk of transmission slippage between the feed roller pulley 410 and the grinding roller pulley 420, ensuring that the rotational speed of the grinding roller 300 is strictly synchronized with that of the feed roller 200, while reducing abnormal belt wear and extending the service life of the transmission system.

[0033] like Figure 1 As shown, the belt drive mechanism 400 further includes a positioning sleeve 460. The positioning sleeve 460 is sleeved on the grinding roller 300, and one end of the grinding roller pulley 420 is disposed inside one end of the positioning sleeve 460. The cylindrical body of the positioning sleeve 460 is tightly fitted to the shaft of the grinding roller 300, and supports the grinding roller pulley 420 through its end face, eliminating radial assembly clearance in the key connection; at the same time, it evenly distributes the axial load generated by the belt drive to the entire grinding roller 300, avoiding local stress concentration that could cause deformation of the grinding roller 300, reducing vibration noise and extending bearing life.

[0034] In operation, this embodiment is as follows:

[0035] When the pneumatic clutch 500 engages, its output end drives the annular inner shell 610 to rotate. The pre-compressed torsion spring 640 first absorbs the initial impact torque through elastic deformation, causing the annular outer shell 620 to lag behind the annular inner shell 610, resulting in a relative rotational displacement of 15°-25°. When the rotation angle exceeds the preset value, the limiting pawl 650 on the inner wall of the annular outer shell 620 is embedded in the circumferentially distributed grooves 611 of the annular inner shell 610, achieving locking and driving the input end of the feed roller 200 to rotate synchronously. At this time, the feed roller pulley 410 drives the grinding roller pulley 420 through the belt drive mechanism 400, causing the grinding roller 300 to enter the grinding state. If an abnormal overload is encountered during operation, the pawl slips out of the groove 611, causing the torsion spring to re-enter the buffer deformation state, cutting off the power transmission to protect the equipment. When the clutch is de-energized and disengaged, the pre-compressed torsion spring 640 releases its deformation and automatically resets to its initial position, preparing for the next start-up.

[0036] In this embodiment, the torsion spring buffer assembly 600 forms an annular spring cavity 630 with an annular inner shell 610 and an annular outer shell 620. The pre-compressed torsion spring 640 is embedded in the inner and outer shells at both ends, which can effectively absorb the high-intensity impact force at the moment of engagement of the pneumatic clutch 500 and convert it into the elastic deformation energy of the torsion spring. This significantly reduces the periodic stress concentration transmitted to the input shaft of the feed roller 200 and avoids fatigue fracture of the shaft. At the same time, this mechanical buffer mechanism can automatically reset without external control, reducing the equipment failure rate and maintenance frequency, extending the service life of the feed roller 200 and the entire grinding device, and ensuring production continuity and stability. It improves equipment reliability while reducing maintenance costs.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pneumatically fed flour milling device, characterized in that include: Chassis (100); The feed roller (200) is rotatably mounted on the housing (100); The grinding roller (300) is rotatably disposed within the housing (100); A belt drive mechanism (400) is movably mounted on the housing (100); A pneumatic clutch (500) is connected to the feed roller (200) and is coaxially disposed at one end of the feed roller (200). The pneumatic clutch (500) is synchronously connected to the grinding roller (300) via the belt drive mechanism (400). A torsion spring buffer assembly (600) is disposed between the output end of the pneumatic clutch (500) and the input end of the feed roller (200). The torsion spring buffer assembly (600) includes a coaxially sleeved annular inner shell. (610) and annular shell (620), the annular inner shell (610) is fixedly connected to the output end of the pneumatic clutch (500), and the annular shell (620) is fixedly connected to the output end of the feed roller (200); an annular spring cavity (630) is formed between the annular shell (620) and the annular inner shell (610), and a pre-compression torsion spring (640) is provided in the annular spring cavity (630), and the two ends of the pre-compression torsion spring (640) are respectively engaged with the annular inner shell (610) and the annular shell (620).

2. A pneumatic fed flour milling apparatus as claimed in claim 1, wherein: The torsion spring buffer assembly (600) also includes a limiting pawl (650), which is disposed on the inner wall of the annular outer shell (620). When the annular inner shell (610) rotates relative to the annular outer shell (620) by an angle exceeding a preset angle value, the limiting pawl (650) is locked in the groove (611) on the annular inner shell (610).

3. A pneumatic fed flour milling apparatus as claimed in claim 2, wherein: The preset angle value is 15°-25°, and at least 6 grooves (611) are evenly distributed around the annular inner shell (610).

4. The pneumatic fed flour milling apparatus of claim 1, wherein: The pre-compression torque of the pre-compression torsion spring (640) is 10%-30% of the rated load torque of the grinding roller (300).

5. The pneumatic fed mill as claimed in claim 1, wherein: The belt drive mechanism (400) includes a feed roller pulley (410) and a grinding roller pulley (420); the feed roller pulley (410) is rotatably mounted on the feed roller (200), the annular outer shell (620) is fixedly connected to the feed roller pulley (410), the feed roller pulley (410) is drive-connected to the feed roller (200), and the feed roller pulley (410) is located at the pneumatic clutch (500); the grinding roller pulley (420) is rotatably mounted on the grinding roller (300), and the grinding roller pulley (420) is drive-connected to the grinding roller (300).

6. A pneumatic fed flour milling apparatus as claimed in claim 5, wherein: The belt drive mechanism (400) further includes a tensioning pulley (430); a tensioning pulley bracket (440) is provided on the housing (100); the tensioning pulley (430) is rotatably mounted on the tensioning pulley bracket (440) via a tensioning pulley shaft (450); the feed roller pulley (410), the grinding roller pulley (420) and the tensioning pulley (430) are connected by belt drive.

7. A pneumatic fed flour milling apparatus as claimed in claim 5, wherein: The belt drive mechanism (400) further includes a positioning sleeve (460); the positioning sleeve (460) is sleeved on the grinding roller (300), and one end of the grinding roller pulley (420) is located inside one end of the positioning sleeve (460).

8. A pneumatic fed flour milling apparatus as claimed in claim 7, wherein: The belt drive mechanism (400) also includes a rotating bearing (470); the rotating bearing (470) is sleeved on the grinding roller (300), and bearing end caps (480) are provided at both ends of the rotating bearing (470), and the other end of the positioning sleeve (460) is provided inside the bearing end caps (480).

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