detailed description

1、 Product Overview and Usage:

The single cone spiral belt dryer is a multifunctional fully enclosed vertical vacuum drying equipment that integrates drying, crushing, and powder mixing. Its drying efficiency is 3-5 times that of the same specification "double cone rotary vacuum dryer". Mainly used for powder drying in industries such as pharmaceuticals, chemicals, pesticides, and food, it can achieve continuous operation in a closed process and is the drying equipment for the above-mentioned industries.

2、 Equipment process characteristics:

The drying and mixing of powders are important steps in the production of active pharmaceutical ingredients, so the selection of drying and mixing equipment is crucial for the quality of the final product and also determines the production and operating costs. The newly developed "single cone spiral belt dryer" by our company is a drying technology in the domestic chemical and pharmaceutical industry with its unique structure and advantages.

（1） The selection of dryers needs to meet the specific requirements and characteristics of various products and processes. The content mainly includes the following aspects:

1. Most of the raw materials processed in production are thermally sensitive, so material clumping often occurs during the drying process. This requires minimizing the drying time and efficiency.

2. In material production, the purity of the circulating gas used in the drying process can have a significant impact on the quality of the material. This device adopts a unique gas supply technology to minimize the impact of gas on the drying process. From the perspective of operational economy, it is hoped that the process pipeline can be fixedly installed, thereby saving the rotational space required for a double cone dryer.

3. In order to ensure the continuity of the entire process and reduce material leakage losses, the solid discharge flow rate of the dryer is controllable. This can reduce the workload of manual loading and unloading in the cleaning area and prevent material from being washed out.

（2） Structure and characteristics of single cone spiral belt dryer:

1. The working process of the DZLG series single cone vacuum ribbon dryer is an intermittent batch operation. After the wet material enters the silo, it is heated through the jacket on the cylinder wall and the interior of the propeller, so that the heating area reaches 140% of the entire container area, and the material is heated and dried. And select the corresponding cone type drying mixer model (working volume) to achieve the desired drying effect. The hybrid dryer with an upward drive structure has the characteristics of drying and mixing capacity, ample space, and easier maintenance for users.

2. Smooth operation, protecting crystal form:

The DZLG series spiral vacuum drying process does not use any auxiliary tools during the drying and mixing process, but only utilizes the revolution and rotation of the conical stirring screw. This allows the material to move in the silo in addition to being lifted and continuously sheared and dispersed by the stirring screw, and the material is not subjected to any external force except for the lifting from the spiral slurry, avoiding ineffective friction between the powder and the equipment as well as between the powder grains, which is often the main factor leading to the destruction of the material crystal form. This is also the fundamental reason why LZG series spiral vacuum drying can maintain the integrity of material crystal shape during the operation process.

3. Partially driven, eliminating the possibility of contamination caused by shaft seals to the product:

By adopting partial drive and relative bottom drive, this device can avoid the following drawbacks:

The mixing blade is disassembled using specialized equipment for cleaning and maintenance

It is difficult to achieve true sealing of the agitator shaft seal and lacks quality assurance

4. Low operating energy consumption cost and high mixing efficiency:

The DZLG series single cone vacuum ribbon drying is driven by a motor, with a unique design. The screw driven by the motor is used to lift the material, without the energy consumption for separate material discharge. It is worth noting that in the process of mixing and drying, traditional mixing and drying equipment provides a belt type stirring blade. Its working principle is that during the stirring motion, the moving material acts as a whole, and a large amount of energy is used for the circular motion of the entire material. Therefore, the drying efficiency provided by this stirring is low. The LZG series spiral vacuum drying provides a conical spiral stirring, in which the entire stirring blade moves in a circular motion around the axis of the conical silo. The materials in different parts of the container can be stirred. As the spiral stirring progresses, the materials at the bottom of the silo are gradually lifted to the top of the container, and then naturally fall down, and so on. This mixing mode ensures uniform mixing of materials in the container, eliminates the possibility of material clumping during the drying process, and greatly improves the mixing and drying efficiency of materials. And it has the advantages of a wide range of processing capacity and low energy consumption per unit mass.

5. Easy to operate and maintain:

The DZLG series single cone vacuum ribbon drying machine has a simple and effective structure, which is easy for operators to understand. The simple button control makes the operation process simple. Some maintenance work can be completed smoothly and quickly even without personnel, and the set manhole can easily adjust and maintain the moving screw without complex disassembly. The device has few vulnerable parts, and the drive unit such as the bearing box is located in the silo. Users can easily remove the entire unit during maintenance, and the space for the drive unit in the silo is also relatively spacious.

3、 Equipment structural characteristics and functions:

1. The equipment adopts jacket and screw internal heating, which increases the overall heating area of the equipment by about 40%.

The single screw belt stirrer used in the equipment is a patented product of our company, which can achieve the effect of bottom-up circulation stirring and can achieve forced heat transfer performance. When the material loading rate is between 40% and 100%, it can be heated and utilized 100%. Suitable for mixing and drying delicate materials.

3. Fully sealed system, no foreign matter contamination, high cleanliness, especially suitable for mixing and drying of pharmaceutical intermediates and raw materials, as well as for mixing and drying sterile raw materials.

4. The small gap between the single screw mixer and the container wall can effectively prevent materials from sticking to the surface of the container wall.

5. Adopting a small angle conical cylinder structure, the unloading speed is fast, clean, and does not accumulate material.

6. Equipped with a recoil device:

The dust raised during the material drying process is adsorbed onto the vacuum trap, blocking the vacuum channel. The obstruction of the gas channel directly leads to an extension of the drying time. The lower the temperature and shorter the drying time of the material during the drying process, the less the impact on the quality of the material. In response to the above reasons, our company has developed a single cone dryer with a back blowing device installed on the vacuum collector, which can maintain the smoothness of the vacuum channel during the material drying process, thereby improving the drying time and quality.

7. The bottom discharge valve is a suction valve with reliable sealing, which is conducive to vacuum drying.

8. The equipment has a compact structure, operates smoothly, has good sealing, no lubrication leakage, is easy to operate, and has a long service life.

4、 Working principle:

This machine is equipped with a heating jacket on the heating cone, and the heat source is hot water, thermal oil or low-pressure steam, so as to maintain a certain temperature on the inner wall of the cone. The variable frequency speed regulating motor drives the single screw belt agitator to rotate through a parallel helical gear reducer, and the animal material is rotated along the conical cylinder and lifted from bottom to top. After the material reaches the high point, it automatically flows towards the center of the vortex and returns to the bottom of the conical cylinder by gravity and inertia. The entire process forces the material to be heated inside the conical cylinder, with relative convection and mixing. The heat diffuses among the materials, causing irregular reciprocating motion of the materials, completing high-frequency heat exchange between the materials and the single screw belt and cylinder wall surface, and achieving heating and drying effect in a short period of time. Thus, the internal moisture of the material continuously evaporates. Under the action of the vacuum pump, the water vapor is drawn out by the vacuum pump. If it is necessary to recover the liquid, a condenser or a recovery liquid storage tank can be used for recovery. After drying, open the discharge valve at the bottom to discharge the material.

5、 Main structure:

This machine consists of a motor, reducer, frame, mechanical seal, metal sintered mesh filter, hollow double screw belt agitator, conical cylinder with jacket heating, and discharge valve.

1. Transmission and sealing parts:

Composed of an electric motor, reducer, frame, and mechanical seal.

1.1 Electric motor: Adopting variable frequency speed regulation motor, the speed can be adjusted as needed during operation.

1.2 Reducer: The SLFA series helical gear reducer runs smoothly and reliably, with low noise and a long service life.

1.3 Rack: Self designed and manufactured with high precision. Equipped with two sets of roller bearings, the mixer height and radial swing can be adjusted.

1.4 Mechanical seal: Single end sanitary type with material receiving flushing chamber, good sealing performance.

2. Blender:

The hollow mixing shaft is connected to the hollow ribbon with support rods, and the upper and lower ends connected to the hollow ribbon are formed with hollow support rods to form a circuit that can pass through the heat medium. In order to prevent the material from sticking to the cylinder wall, the gap between the screw strip and the cylinder wall is very small.

3. Tank body:

This part consists of an upper head, a conical cylinder, a vacuum filter, a discharge valve, etc.

3.1 Upper head: carries the transmission part and agitator; The inner surface connecting ports have rounded transitions. The material in contact with the material is 316L. The process pipe openings are as follows: DN400 sanitary manhole, pressure gauge, explosion-proof sight light, mirror port, feeding port, cleaning port, vacuum port, etc.

3.2 Lower cone with heating jacket: The inner surface is smooth and can dry the material. When discharging, use the rotation of the mixer to quickly and cleanly discharge the material.

3.3 Filter: Metal sintered mesh is used, with high filtration accuracy and large filtration area. And an exhaust port is set up at the vacuum outlet to perform compressed air blowback regeneration on the filter during exhaust.

3.4 Discharge valve: Adopting a suction valve, its discharge speed is fast, operation is convenient, and there is no residue in the discharge.