Linear mixing and stirring screw feeder and control method

Abstract

The application discloses a linear mixing stirring type screw feeder and a control method, and relates to the raw material mixing processing field.In the application, a plurality of buffer assemblies are arranged on the mixing tank along the vertical direction, and each buffer assembly is provided with an inlet cavity above; the mixing tank is externally connected with a plurality of feeding assemblies, and each feeding assembly is independently connected with an inlet cavity.The lower side of each buffer assembly is further provided with a material guiding assembly, and the material guiding assembly comprises a chassis, a plurality of upper convex parts arranged on the upper side of the chassis, and a lower section blocking groove matched with the upper convex parts; a pressure sensitive resistance rod is further arranged at the middle position of the top side of each upper convex part.A hydraulic pipe for driving the vertical lifting of the material guiding assembly is arranged on the inner side of the mixing tank, and the bottom of the mixing tank is provided with a mixing discharge cavity.The application realizes the synchronous promotion of the raw material mixing process and the subsequent process of using the mixed raw material, and improves the whole production efficiency.

Description

Technical Field

[0001] This invention relates to the field of raw material mixing and processing, and in particular to a linear mixing and stirring screw feeder and its control method. Background Technology

[0002] In the industrial processing of granular raw materials, various raw materials are typically poured into a mixing tank in bags or barrels, and then mixed for a long time to ensure that the particles are evenly dispersed. However, this mixing method has the problem of long mixing time. The raw materials need to be mixed in advance before each use. In actual use, the mixed raw materials may not be used all at once, but rather in continuous, small-scale, uninterrupted use (for example, 500KG of mixed raw materials may only be consumed at a rate of 10KG per minute on the production line, requiring 50 minutes to consume the mixed raw materials. However, adding the initial mixing time of 500KG of raw materials, such as 30 minutes, the actual process time increases to 80 minutes). The necessary initial raw material mixing process significantly increases the overall process time and affects actual production efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a linear mixing and stirring screw feeder and a control method, thereby realizing the synchronous advancement of the raw material mixing process and the subsequent process of using the mixed raw materials, and improving the overall production efficiency.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] This invention provides a linear mixing and stirring screw feeder. The mixing tank is vertically equipped with multiple buffer components, each with a feeding chamber above it. Each feeding chamber of the mixing tank is equipped with a pressure valve. The buffer components have multiple vertical through-structures, each consisting of an upper wide-mouth groove, a middle connecting groove, and a lower sealing groove, arranged from top to bottom.

[0006] The mixing tank is connected to multiple feeding assemblies, each of which is independently connected to a feed chamber. Each feeding assembly includes a feeding pipe, a feeding tank connected to the feeding pipe, and a blower located at the outer end of the feeding pipe. The feeding tank is also equipped with a linear electrically controlled valve.

[0007] Each buffer component is also equipped with a material guiding component on its lower side. The material guiding component includes: a base frame and multiple upper protrusions located on the upper side of the base frame. The upper protrusions cooperate with the lower section sealing groove. A varistor rod is also provided at the middle position of the top side of each upper protrusion. The varistor rod is inserted upward through the lower section sealing groove, the middle section connecting groove, and the upper section wide-mouth groove. The base frame is also provided with material discharge slots distributed on both sides of the upper protrusions.

[0008] The mixing tank has hydraulic pipes installed inside for driving the material guiding assembly to move vertically. The bottom of the mixing tank is a mixing discharge chamber, and a discharge screw is installed at the bottom of the mixing discharge chamber. The mixing tank is also equipped with a screw motor for driving the discharge screw to rotate.

[0009] As a preferred technical solution of the device of the present invention: the lateral opening width of the upper wide-mouth groove and the lower sealing groove is greater than the lateral opening width of the middle connecting groove.

[0010] As a preferred technical solution of the device of the present invention: let the horizontal width of the buffer component be D, the maximum air outlet speed of the fan be Vmax, and the horizontal height difference between the feed pipe, the inlet of the feed chamber and the top side of the buffer component be △H, then the horizontal height difference △H ≥ (1 / 2)g(D / Vmax) 2 .

[0011] As a preferred technical solution of the device of the present invention: the upper side of the upper convex part is provided with symmetrically distributed sealing and fitting inclined surfaces, and the top side wall of the lower sealing groove body is fitted with the sealing and fitting inclined surfaces.

[0012] As a preferred technical solution of the device of the present invention: the inner wall of the material discharge trough of the base frame is provided with an inner flow slope.

[0013] As a preferred embodiment of the device of the present invention: a plurality of varistors are arranged in series on the varistor rod. The top of the varistor rod, which penetrates and is inserted into the upper wide-mouth groove, is horizontally lower than the uppermost opening of the upper wide-mouth groove.

[0014] This invention provides a control method for a linear mixing screw feeder, comprising the following steps:

[0015] S1. The upper-level feeding component starts first, supplying the first raw material to the upper-level feed chamber of the mixing tank. The air output power of the upper-level fan changes periodically according to the system's preset power change function F1(t):

[0016] P min ≤F1(t)≤P max ,... (Formula 1).

[0017] F1(t+mT)=F1(t),......(Equation 2).

[0018] Among them, P min P is the minimum output power preset by the system. max The maximum air output power preset by the system is m, where m is an integer and m≥1, and T is the cycle time.

[0019] S2. After any pressure sensor of the upper-level material guiding assembly detects the pressure signal generated by the accumulation of raw materials, the system analyzes the position M1 of the pressure sensor that generated the pressure signal and the raw material quantity parameter Q1 corresponding to the pressure parameter.

[0020] S3. The feeding assembly at the second-to-upper level is activated, starting to supply the second raw material into the feed chamber at the second-to-upper level of the mixing tank. Based on the position of the pressure-sensitive resistor rod generating the pressure signal from the upper-level guiding assembly and the intensity of the generated pressure signal, the output power of the blower at the second-to-upper level is controlled to P. X The amount of the second type of raw material Q2 is controlled in the wide-mouth tank above the varistor rod located at position M1 in the second-upper layer. Among them, P X This is the minimum power required to ensure the second material reaches the upper section of the wide-mouth groove where the varistor rod is located at position M1 in the second-upper layer. Specifically, when the ratio of Q2 to Q1 reaches the system's preset mixing ratio of the second material to the first material, the blowing of the second material into the upper section of the wide-mouth groove where the varistor rod is located at position M1 in the second-upper layer is stopped.

[0021] S4. The feeding component at the lower level is activated, and begins to supply subsequent types of raw materials to the feed chamber at the lower level of the mixing tank. Based on the pressure signal intensity generated by the pressure-sensitive resistor rod at the position of the pressure signal generated by the material guiding component at the adjacent upper level, the output power of the fan at the lower level and the amount of subsequent raw materials accumulated in the upper wide-mouth trough at the corresponding position are adjusted.

[0022] S5. When the amount of raw material accumulated in the upper wide-mouth trough of any of the buffer components in the mixing tank reaches the maximum parameter preset by the system, all feeding components stop feeding. The hydraulic pipe at the bottom position drives the guide component to move down and locks the downward position, releasing the raw material accumulated in the buffer component at the bottom position. Then, in order from bottom to top, the raw material accumulated in the corresponding layer buffer components is released in sequence until all the raw material in the mixing tank is released into the mixing discharge chamber. Then, all hydraulic pipes drive their respective connected guide components to rise and reset, and the raw material injection starts again, repeating S1 to S4.

[0023] S6. The screw motor drives the discharge screw to rotate, which performs secondary mixing and output of various raw materials that have been initially mixed according to the mixing ratio.

[0024] Compared with existing technologies, the beneficial effects of this invention are:

[0025] This invention linearly disperses various raw materials that originally required simultaneous large-scale mixing and stirring. Through automatic adjustment of the feeding position and feeding amount, the distribution of various raw materials falling into the mixing and discharging chamber is more uniform. After secondary mixing by the discharge screw, the raw materials can be quickly output to the subsequent processes. This basically realizes the synchronous advancement of the raw material mixing process and the subsequent process of using the mixed raw materials, improving the overall production efficiency (for example, after using the equipment and method of this invention, the time required to completely output 500KG of raw materials is 40 minutes. Although it takes longer than the traditional "big pot" mixing and processing, it has the advantage of timely output, continuously providing well-mixed raw materials for subsequent production processes). Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the linear mixing and stirring screw feeder of the present invention.

[0027] Figure 2 for Figure 1 A magnified schematic diagram of a portion of point A in the middle.

[0028] Figure 3 This is a schematic diagram of the material guiding assembly and hydraulic pipe in this invention.

[0029] Figure 4 This is a schematic diagram of the varistor rod in this invention.

[0030] Figure 5 This is an image showing the change in the air output power of the fan at the upper position in this invention.

[0031] Wherein: 1-Mixing tank; 2-Buffer component, 201-Upper wide-mouth trough, 202-Middle connecting trough, 203-Lower sealing trough; 3-Feeding chamber; 4-Feeding component, 401-Feeding pipe, 402-Feeding tank, 403-Linear solenoid valve, 404-Blower; 5-Guiding component, 501-Base frame, 502-Upper protrusion, 503-Sealing mating slope, 504-Discharge trough, 505-Inner flow slope, 506-Varistor rod, 5061-Varistor; 6-Hydraulic pipe; 7-Mixing discharge chamber; 8-Discharge screw; 9-Screw motor; 10-Pressure valve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] Example 1: This invention designs a linear mixing and stirring screw feeder, the main structural contents of which are as follows:

[0034] Please see Figure 1 Multiple buffer components 2 are fixedly installed vertically inside the mixing tank 1. Each buffer component 2 is also equipped with a material guide component 5 on its lower side. The feeding chamber 3 is located above the buffer components 2. The mixing tank 1 is equipped with multiple pressure valves 10, and each feeding chamber 3 is equipped with a pressure valve 10. Multiple feeding components 4 are fixedly installed in the mixing tank 1. The feeding components 4 include a feeding pipe 401, a feeding tank 402, and a blower 404. The feeding tank 402 is connected to the feeding pipe 401. The blower 404 is located at the outer end of the feeding pipe 401. The feeding tank 402 is also equipped with a linear solenoid valve 403. The feeding pipe 401 of each feeding component 4 is independently connected to the feeding chamber 3 at the corresponding position.

[0035] The mixing discharge chamber 7 is located at the bottom of the mixing tank 1. A discharge screw 8 is installed at the bottom of the mixing discharge chamber 7. The mixing tank 1 is also equipped with a screw motor 9, which drives the discharge screw 8 to rotate for secondary mixing and output of the raw materials.

[0036] In addition, let the horizontal width of the buffer component 2 be D, the maximum air outlet speed of the fan 404 be Vmax, and the horizontal height difference between the feed pipe 401, the inlet of the feed chamber 3 and the top side of the buffer component 2 be △H. According to the parabolic material, the horizontal height difference △H ≥ (1 / 2)g(D / Vmax). 2 This allows the raw materials to reach the furthest position of the cache component.

[0037] Please see Figure 2 The cache component 2 has multiple vertical through structures, each through structure consisting of an upper wide-mouth groove 201, a middle connecting groove 202, and a lower sealing groove 203 from top to bottom.

[0038] Material guiding assembly 5: base frame 501, multiple upper protrusions 502, varistor rod 506. Multiple upper protrusions 502 are squeezed and distributed on the upper side of base frame 501. The upper protrusions 502 cooperate with the lower section sealing groove 203. The varistor rod 506 is located in the middle position on the top side of the upper protrusion 502. The varistor rod 506 is inserted upward through the lower section sealing groove 203, the middle section connecting groove 202, and the upper section wide-mouth groove 201. The base frame also has material discharge slots 504 distributed on both sides of the upper protrusions 502. The upper protrusions 502 move upward and can just block the lower section sealing groove 203.

[0039] In addition, the lateral opening width of the upper wide-mouth groove 201 and the lower sealing groove 203 is greater than the lateral opening width of the middle connecting groove 202. The cross-section of the upper wide-mouth groove 201 is a trapezoidal shape that is wider at the top and narrower at the bottom, and the cross-section of the lower sealing groove 203 is a trapezoidal shape that is narrower at the top and wider at the bottom.

[0040] The upper convex part 502 has a triangular cross-section, and two sealing and mating inclined surfaces 503 are distributed on both sides of the triangle. The top side wall of the lower sealing groove 203 is mated with the sealing and mating inclined surfaces 503.

[0041] Combination Figure 1 , Figure 2 After the varistor rod 506 is inserted through the upper wide-mouth groove 201, the horizontal position of the top of the varistor rod 506 is lower than the horizontal position of the uppermost opening of the upper wide-mouth groove 201, that is, the varistor rod 506 will not protrude out of the upper wide-mouth groove 201 area.

[0042] Please see Figure 2 , Figure 3 The mixing tank 1 is equipped with a hydraulic pipe 6 for driving the material guiding assembly 5 to rise and fall vertically. The output shaft of the hydraulic pipe 6 faces upward and is connected to the corner of the base frame 501, thereby driving the base frame 501 to rise and fall.

[0043] Please see Figure 3 The inner wall of the material discharge trough 504 of the base frame 501 is provided with an inner flow slope 505. The inner flow slope 505 slopes inward and downward, so that the material slides down into the material discharge trough 504.

[0044] Please see Figure 4 Multiple varistors 5061 are provided on the varistor rod 506, and the varistors 5061 are continuously connected in series along the vertical direction.

[0045] Example 2: This invention employs a control method that controls the pre-mixing ratio of corresponding types and then outputs the mixture in real time via screw stirring, comprising the following steps:

[0046] First, the upper feeding component 4 is activated, starting to supply the first raw material to the upper feeding chamber 3 of the mixing tank 1, combined with... Figure 5 As can be seen, the air output power of the upper-level fan 404 varies periodically according to the system's preset power change function F1(t), and F1(t) satisfies the following relationship:

[0047] P min ≤F1(t)≤P max ,...(Formula 1)

[0048] F1(t+mT)=F1(t),......(Equation 2)

[0049] Among them, P min P is the minimum output power preset by the system. max The maximum air output power preset by the system is m, where m is an integer and m≥1, and T is the cycle time.

[0050] In the second step, after any one of the pressure-sensitive resistor rods 506 in the upper-level material guiding component 5 detects the pressure signal generated by the accumulation of raw materials, the system analyzes the position M1 of the pressure-sensitive resistor rod 506 that generates the pressure signal and the raw material quantity parameter Q1 corresponding to the pressure parameter. For example, the pressure signals generated by the pressure-sensitive resistors 5061 at different positions on the pressure-sensitive resistor rod 506 represent the different accumulation heights of the raw materials in the middle section connecting groove 202 and the upper section wide-mouth groove 201.

[0051] Third, the feeding assembly 4 at the second-upper position is activated, starting to supply the second raw material to the feeding chamber 3 at the second-upper position of the mixing tank 1. Based on the position of the pressure-sensitive resistor rod 506 generating the pressure signal from the upper-position guiding assembly 5 and the intensity of the generated pressure signal, the output power of the blower 404 at the second-upper position is controlled to P. X The amount of the second type of raw material Q2 is controlled in the upper section of the wide-mouth groove 201 where the varistor rod 506 is located at the position of the second upper layer M1.

[0052] In this invention, the output power of the fan 404 is P. X At that time, the air output of the fan 404 can ensure that the second raw material reaches the upper section of the wide-mouth groove 201 where the varistor rod 506 is located at the next upper layer M1 position.

[0053] In this invention, when the ratio of Q2 to Q1 reaches the system's preset mixing ratio of the second raw material to the first raw material, for example, when Q2:Q1=2, that is, when the mixing ratio of the second raw material to the first raw material reaches 2:1, the blowing of the second raw material into the upper wide-mouth groove 201 where the varistor rod 506 is located at the next upper layer M1 position is stopped.

[0054] The fourth step is to start the feeding component 4 at the lower position, which begins to supply subsequent types of raw materials to the feeding chamber 3 at the lower position of the mixing tank 1. The output power of the fan 404 at the lower position and the amount of subsequent raw materials accumulated in the upper wide-mouth trough 201 are adjusted according to the pressure signal intensity generated by the pressure-sensitive resistor rod 506 at the position of the adjacent upper feeding component 5.

[0055] In addition, when the amount of raw material accumulated in the upper wide-mouth trough 201 of any of the buffer components 2 in the mixing tank 1 reaches the maximum parameter preset by the system, for example, when the raw material accumulation in the upper wide-mouth trough 201 "submerges" 80% of the resistance of the varistor rod 506, all feeding components 4 stop feeding. The hydraulic pipe 6 at the bottom position drives the guiding component 5 to move down and lock the downward position, releasing the raw material accumulated in the buffer component 2 at the bottom position. Then, in the order from bottom to top, the raw material accumulated in the corresponding layer buffer component 2 is released in sequence until all the raw material in the mixing tank 1 is released into the mixing discharge chamber 7. Then, all hydraulic pipes 6 drive the guiding component 5 connected to them to rise and reset, reconnecting the guiding component 5 with the buffer component 2, and restarting the raw material injection, repeating the contents of the first to fourth steps.

[0056] At this point, the various raw materials falling into the mixing and discharge chamber 7 have been distributed relatively evenly according to the mixing ratio. Finally, the screw motor 9 drives the discharge screw 8 to rotate, and performs secondary mixing and output of the various raw materials that have been initially mixed according to the mixing ratio.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A linear mixing and stirring screw feeder, characterized in that: The mixing tank (1) includes a plurality of buffer components (2) arranged vertically, and each buffer component (2) has a feeding chamber (3) above it. Each feeding chamber (3) of the mixing tank (1) is equipped with a pressure valve (10). The cache component (2) is provided with multiple vertical through structures, each through structure being, from top to bottom, an upper wide-mouth groove (201), a middle connecting groove (202), and a lower sealing groove (203). The mixing tank (1) is externally connected to multiple feeding components (4), each feeding component (4) being independently connected to a feeding chamber (3); The feeding assembly (4) includes a feeding pipe (401), a feeding tank (402) connected to the feeding pipe (401), and a fan (404) located at the outer end of the feeding pipe (401). The feeding tank (402) is also equipped with a linear solenoid valve (403). Let the horizontal width of the buffer component (2) be D, the maximum air outlet speed of the fan (404) be Vmax, and the horizontal height difference between the feed pipe (401), the inlet of the feed chamber (3) and the top side of the buffer component (2) be △H. Then the horizontal height difference △H ≥ (1 / 2)g(D / Vmax) 2 ; Each buffer component (2) is also provided with a material guiding component (5) on its lower side. The material guiding component (5) includes: a base frame (501) and a plurality of upper protrusions (502) located on the upper side of the base frame (501). The upper protrusions (502) cooperate with the lower section sealing groove (203). A varistor rod (506) is also provided at the middle position on the top side of each upper protrusion (502). The varistor rod (506) is inserted upward through the lower section sealing groove (203), the middle section connecting groove (202), and the upper section wide-mouth groove (201). The base frame is also provided with material discharge slots (504) distributed on both sides of the upper protrusions (502). The mixing tank (1) is equipped with a hydraulic pipe (6) for driving the material guiding assembly (5) to rise and fall vertically. The bottom of the mixing tank (1) is a mixing discharge chamber (7), and the bottom of the mixing discharge chamber (7) is provided with a discharge screw (8). The mixing tank (1) is also equipped with a screw motor (9) for driving the discharge screw (8) to rotate.

2. The linear mixing and stirring screw feeder according to claim 1, characterized in that: The lateral opening width of the upper wide-mouth groove (201) and the lower sealing groove (203) is greater than the lateral opening width of the middle connecting groove (202).

3. The linear mixing and stirring screw feeder according to claim 1, characterized in that: The upper side of the upper protrusion (502) is provided with symmetrically distributed sealing and fitting inclined surfaces (503), and the top side wall of the lower sealing groove (203) is fitted with the sealing and fitting inclined surfaces (503).

4. The linear mixing and stirring screw feeder according to claim 1, characterized in that: The inner wall of the material discharge trough (504) of the base frame (501) is provided with an inner flow slope (505).

5. A linear mixing and stirring screw feeder according to claim 1, characterized in that: The varistor rod (506) is provided with a plurality of varistors (5061) continuously connected in series. The top of the varistor rod (506) that penetrates the upper wide-mouth groove (201) is horizontally lower than the uppermost opening of the upper wide-mouth groove (201).

6. A control method for a linear mixing screw feeder, characterized in that, The linear mixing and stirring screw feeder according to any one of claims 1 to 5 includes the following steps: S1. The upper feeding assembly (4) is started first, and the first raw material is supplied to the upper feeding chamber (3) of the mixing tank (1); The power output of the upper-level fan (404) varies periodically according to the system's preset power variation function F1(t): P min ≤F1(t)≤P max , (Formula 1); F1(t+mT)=F1(t), (Equation 2); Among them, P min P is the minimum output power preset by the system. max The maximum air output power preset by the system, m is an integer, m≥1, and T is the cycle time; S2. After any pressure-sensitive resistor rod (506) of the upper position material guiding component (5) detects the pressure signal generated by the accumulation of raw materials, the system analyzes the position M1 of the pressure-sensitive resistor rod (506) that generates the pressure signal and the raw material quantity parameter Q1 corresponding to the pressure parameter. S3. The feeding assembly (4) at the second-upper position is started, and the second raw material is supplied to the feeding chamber (3) at the second-upper position of the mixing tank (1). According to the position of the pressure-sensitive resistor rod (506) that generates the pressure signal from the upper position guiding assembly (5) and the intensity of the generated pressure signal, the output power of the blower (404) at the second-upper position is controlled to be P. X The amount of the second type of raw material Q2 is controlled in the wide-mouth groove (201) above the varistor rod (506) at the position of the second upper layer M1; Among them, P X It is the minimum power required to ensure that the second raw material reaches the upper section of the wide-mouth groove (201) where the varistor rod (506) is located at the next upper layer M1 position; When the ratio of Q2 to Q1 reaches the system's preset ratio of the mixing quantity of the second raw material to the first raw material, the second raw material is stopped from being blown into the upper wide-mouth groove (201) where the varistor rod (506) is located at the next upper layer M1 position; S4. The feeding component (4) at the lower position is started to supply subsequent types of raw materials to the feeding chamber (3) at the lower position of the mixing tank (1). The output power of the fan (404) at the lower position and the amount of subsequent raw materials piled in the upper section wide-mouth trough (201) are adjusted according to the pressure signal intensity generated by the pressure-sensitive resistor rod (506) of the material guiding component (5) at the adjacent upper position. S5. When the amount of raw material accumulated in the upper wide-mouth groove (201) of any of the buffer components (2) of the mixing tank (1) reaches the maximum parameter preset by the system, all feeding components (4) stop feeding, the hydraulic pipe (6) at the bottom position drives the guide component (5) to move down and lock the downward position, release the raw material accumulated in the buffer component (2) at the bottom position, and then release the raw material accumulated in the corresponding layer buffer component (2) in the order from bottom to top, until all the raw materials in the mixing tank (1) are released into the mixing discharge chamber (7), all hydraulic pipes (6) drive the guide component (5) connected to them to rise and reset, and start the raw material injection again, repeating S1 to S4; S6. The screw motor (9) drives the discharge screw (8) to rotate, and performs secondary mixing and output of various raw materials that are initially mixed according to the mixing ratio.

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