Feeding turning plate structure of granulation mixing tank in processing technology of loss-control compound fertilizer

Abstract

The feeding turning plate structure of the granulation mixing tank in the processing technology of the loss-control compound fertilizer comprises a mixing tank body, a discharging pipe, a hinge arm and a valve plate, a bolt rod is arranged at the center of the front side of the valve plate and comprises a first rod body and a second rod body, and the first rod body and the second rod body are provided with a first external thread and a second external thread respectively; the diameter of the addendum circle of the first external thread is smaller than that of the second external thread, the lead angle of the first external thread is smaller than that of the second external thread, a valve body made of polytetrafluoroethylene is arranged on the second rod body and is in a circular truncated cone shape, and the valve body is connected with the second rod body in a screwed mode. The front side of the first rod body exceeds the front side of the valve body and is connected with a locking nut matched with the first external thread on the first rod body in a screwed mode, and a conical face matched with the circular-truncated-cone-shaped valve body in the circumferential direction is arranged at the end, close to the valve plate in the axial direction, of the discharging pipe. The flap valve is good in sealing performance, not prone to material leakage, stable in performance and long in overall service life.

Description

Technical Field

[0001] The utility model relates to a feeding flap structure of a granulation mixing tank in a processing technology for controlling the loss of compound fertilizers. Background Art

[0002] Controlled-release compound fertilizers are key products for improving soil fertility and promoting plant growth. During production, the granules must be coated with a coating material that resists degradation. Controlled-release compound fertilizers, on the other hand, address the inefficiencies of nutrient loss and volatilization in chemical fertilizers by adding nutrient-capturing agents to the formula, improving fertilizer utilization while reducing environmental pollution. High-tower granulation is often used in production, effectively enhancing granule uniformity and yield rates for controlled-release fertilizers.

[0003] In the production process of controlled-loss compound fertilizers, flap valves are a commonly used discharge device. Their structure and functions are widely used in many industries, such as the related structural design mentioned in Chinese Patent CN217583202U. However, the use of traditional stainless steel flap valves as the discharge port in the high-tower granulation mixing tank of controlled-loss compound fertilizers has some significant shortcomings. The design of conventional flap valves forms a hard seal between them and the discharge pipe. Due to the high viscosity of the loss control agent, the valve does not close tightly, resulting in leakage problems. Especially for the second mixing tank (generally, the first mixing tank is injected with room temperature raw materials, and the second mixing tank is injected with processed high-temperature materials). Due to the high feed temperature, operators are easily burned by the high-temperature material leaking from the valve plate when repairing the emulsifier. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a feeding flap structure of a granulation mixing tank in the preparation process of controlled loss compound fertilizer, the flap has good sealing performance, is not easy to leak, the flap valve has stable performance and a long overall life.

[0005] In order to solve the above technical problems, the utility model provides a feeding flap structure of a granulating mixing trough in the processing technology of controlled loss compound fertilizer, comprising a mixing trough body, a discharge pipe, an articulated arm, and a valve plate. The discharge pipe is arranged on the circumferential side wall of the mixing trough body, and the end of the discharge pipe exceeds the circumferential side wall of the mixing trough body. The valve plate is installed on the inner wall of the mixing trough through the articulated arm and cooperates with the discharge pipe. It is characterized in that: the side of the valve plate close to the discharge pipe along its normal direction is the front side, and the side away from the discharge pipe is the rear side. A bolt rod extending forward along the normal direction is provided at the center of the front side of the valve plate. The bolt rod comprises a first rod body and a second rod body coaxially arranged in front and back. The first rod body is circumferentially provided with a first external thread, and the second rod body is circumferentially provided with a second external thread. The tooth top circle diameter of the first external thread is smaller than The bottom circle diameter of the second external thread, the helix angle of the first external thread is smaller than the helix angle of the second external thread, and the second rod body is provided with a valve body made of polytetrafluoroethylene. The valve body is frustum-shaped, and its axial direction is front-to-back. The front diameter of the frustum-shaped valve body is small and the rear diameter is large. A threaded hole is provided axially through the frustum-shaped valve body at the axis core, and the internal thread of the threaded hole matches the second external thread. The valve body is screwed to the second rod body, and the rear side of the valve body is against the front side of the valve plate. The front side of the valve body extends beyond the front side of the second rod body, and the front side of the first rod body extends beyond the front side of the valve body and is screwed with a locking nut matching the first external thread on the first rod body. The rear side of the locking nut is tightly attached to the front side of the valve body, and the discharge pipe is provided with a conical surface that matches the circumference of the frustum-shaped valve body at one end close to the valve plate along its axial direction.

[0006] Advantages of this utility model:

[0007] The valve body of the present invention adopts a truncated cone-shaped valve body made of polytetrafluoroethylene. The truncated cone-shaped valve body has a conical surface, and a corresponding conical surface is also provided on the discharge pipe. Compared with the traditional straight surface sealing, the conical surface sealing effect has a larger fitting area and a better sealing effect. Polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance. The valve body is installed using a two-stage bolt rod. If the screw connection between the valve body and the second rod body becomes loose, the valve body tends to drive the locking nut to rotate. However, since the helix angle of the first external thread is smaller than the helix angle of the second external thread (the locking nut is driven by the valve body through friction, so the rotation angle of the locking nut is less than or equal to the valve body rotation angle), the axial movement distance of the valve body is greater than the axial movement distance of the locking nut. This will only make the locking nut fit more tightly with the valve body and will not drive the locking nut to rotate. This structure makes the valve body itself have extremely high mechanical stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural diagram of the utility model (flap closed state).

[0009] Figure 2This is another structural diagram of the present invention (flap open state). DETAILED DESCRIPTION

[0010] See also Figure 1-Figure 2 , the feeding flap structure of the granulation mixing trough in the preparation process of controlled loss compound fertilizer includes a mixing trough body 1, a discharge pipe 2, an articulated arm 3, and a valve plate 4. The discharge pipe 2 is arranged on the circumferential side wall of the mixing trough body 1, and the end of the discharge pipe 2 exceeds the circumferential side wall of the mixing trough body 1. The valve plate 4 is installed on the inner wall of the mixing trough through the articulated arm 3 and cooperates with the discharge pipe 2. The side of the valve plate 4 close to the discharge pipe 2 along its normal direction is the front side, and the side away from the discharge pipe 2 is the rear side. A bolt rod 5 extending forward along the normal direction is provided at the center of the front side of the valve plate 4. The bolt rod 5 includes a first rod body 51 and a second rod body 52 arranged coaxially in front and back. The first rod body 51 is circumferentially provided with a first external thread, and the second rod body 52 is circumferentially provided with a second external thread. The tooth top circle diameter of the first external thread is smaller than the tooth bottom circle diameter of the second external thread. The helix angle of the first external thread is smaller than the helix angle of the second external thread. The second rod body 52 is provided with a valve body 6 made of polytetrafluoroethylene. The valve body 6 is truncated cone-shaped, and its axial direction is forward and backward. The front diameter of the truncated cone-shaped valve body 6 is small and the rear diameter is large. A threaded hole is provided at the axis core of the truncated cone-shaped valve body 6 that passes through it axially. The internal thread of the threaded hole matches the second external thread. The valve body 6 is screwed to the second rod body 52, and the rear side of the valve body 6 is against the front side of the valve plate 4. The front side of the valve body 6 extends beyond the front side of the second rod body 52. ​​The front side of the first rod body 51 extends beyond the front side of the valve body 6 and is screwed with a locking nut 7 that matches the first external thread on the first rod body 51. The rear side of the locking nut 7 is tightly attached to the front side of the valve body 6, and the discharge pipe 2 is provided with a conical surface 21 that matches the circumference of the truncated cone-shaped valve body 6 at one end along its axial direction close to the valve plate 4.

[0011] Advantages of this utility model:

[0012] The valve body 6 in the present invention adopts a truncated cone-shaped valve body 6 made of polytetrafluoroethylene. The truncated cone-shaped valve body 6 has a conical surface, and a corresponding conical surface 21 is also provided on the discharge pipe 2. The sealing effect of the conical surface 21 is compared with the traditional straight face seal, the fitting area becomes larger, and the sealing effect is good. Polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging endurance. The valve body 6 is installed using a two-stage bolt rod 5. If the screw connection between the valve body 6 and the second rod body 52 becomes loose, the valve body 6 tends to drive the locking nut 7 to rotate. However, since the helix angle of the first external thread is smaller than the helix angle of the second external thread (the locking nut 7 is driven by the valve body 6 through friction, so the rotation angle of the locking nut 7 is less than or equal to the rotation angle of the valve body 6), the axial movement distance of the valve body 6 is greater than the axial movement distance of the locking nut 7. This will only make the locking nut 7 fit more closely to the valve body 6 and will not drive the locking nut 7 to rotate. This structure makes the valve body 6 itself have extremely high mechanical stability.

Claims

1. The feeding flap structure of the granulation mixing trough in the process of controlling the loss of compound fertilizer is characterized by: It includes a mixing trough body, a discharge pipe, an articulated arm, and a valve plate. The discharge pipe is arranged on the circumferential side wall of the mixing trough body, and the end of the discharge pipe exceeds the circumferential side wall of the mixing trough body. The valve plate is installed on the inner wall of the mixing trough through the articulated arm and cooperates with the discharge pipe. It is characterized in that: the side of the valve plate close to the discharge pipe along its normal direction is the front side, and the side away from the discharge pipe is the rear side. A bolt rod extending forward along the normal direction is provided at the center of the front side of the valve plate. The bolt rod includes a first rod body and a second rod body coaxially arranged in front and back connection. The first rod body is circumferentially provided with a first external thread, and the second rod body is circumferentially provided with a second external thread. The tooth top circle diameter of the first external thread is smaller than the tooth bottom circle diameter of the second external thread. The spiral rise of the first external thread The angle is smaller than the helix angle of the second external thread. The second rod body is provided with a valve body made of polytetrafluoroethylene. The valve body is frustum-shaped, and its axial direction is front-to-back. The front diameter of the frustum-shaped valve body is small and the rear diameter is large. A threaded hole is provided at the axis core of the frustum-shaped valve body that passes through it axially. The internal thread of the threaded hole matches the second external thread. The valve body is screwed to the second rod body, and the rear side of the valve body is against the front side of the valve plate. The front side of the valve body extends beyond the front side of the second rod body. The front side of the first rod body extends beyond the front side of the valve body and is screwed with a locking nut that matches the first external thread on the first rod body. The rear side of the locking nut is tightly attached to the front side of the valve body, and a conical surface that matches the circumference of the frustum-shaped valve body is provided on one end of the discharge pipe along its axial direction close to the valve plate.

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