A mixer feed control device

Abstract

This invention discloses a feed control device for a mixer, relating to the field of feed control technology. It includes: a weighing body for weighing the material reduction; a receiving bin suspended above the weighing body for receiving materials; a first screw conveyor located at the bottom of the receiving bin; a second screw conveyor located on the weighing body and below the first screw conveyor; and a differential compensation channel connecting the discharge port of the first screw conveyor and the inlet of the second screw conveyor to achieve partial material suspension, compensating for material overfeeding caused by signal transmission delay. This invention, by adding a differential compensation channel, utilizes the principle that suspended material within the channel cannot be weighed by the weighing body. When the weighing body detects that the material reduction reaches a preset value and triggers a stop signal, this suspended material precisely compensates for the extra material feeding during the delay period, completely solving the problem of excessive material feeding caused by signal delay in traditional loss-in-weight scale feed control.

Description

Technical Field

[0001] This invention relates to the field of feed control technology, specifically to a feed control device for a mixer. Background Technology

[0002] In industries such as construction, chemical processing, and food processing, mixers are commonly used material mixing equipment, and the precise control of their feed rate directly affects the quality stability of the final product. Currently, most mixer feed control devices on the market use loss-in-weight scales for feed metering and control. Their working principle is to determine the feed rate by weighing the amount of material lost. When the scale detects that the lost material weight has reached a preset value, it transmits a stop-feed signal to the control mechanism, thereby stopping the feeding equipment.

[0003] However, this traditional loss-in-weight weigher feeding control method has obvious technical defects: during the process of the weigher detecting that the material reduction has reached the preset value and transmitting a signal to the feeding device to stop feeding, there is an unavoidable signal transmission delay. During this delay, the feeding device will continue to feed, causing the actual feeding amount to exceed the preset value, that is, the problem of overfeeding occurs. Overfeeding not only causes material waste, but also disrupts the material ratio, affects the mixing effect of the mixer, and thus reduces product quality. This problem is more prominent in scenarios where the accuracy of material ratio is required. Summary of the Invention

[0004] The purpose of this invention is to provide a feed control device for a mixer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mixer feed control device, comprising: A weighing body, the weighing body being used to weigh the amount of material reduction; The storage compartment is suspended above the scale body and is used to store materials. The No. 1 screw conveyor is located at the bottom of the storage bin, and its inlet is connected to the outlet of the storage bin to achieve uniform material conveying. The No. 2 screw conveyor is located on the scale body and below the No. 1 screw conveyor; The differential compensation channel connects the discharge port of the No. 1 screw conveyor with the feed port of the No. 2 screw conveyor to achieve partial material suspension in order to compensate for the material over-release caused by signal transmission delay. It includes an extension tube and a receiving tube. The extension tube is located inside the receiving tube and can slide along the axial direction of the receiving tube to realize the length adjustment of the differential compensation channel, thereby realizing the quantity adjustment of suspended material. The spacing adjustment mechanism, located between the No. 1 screw conveyor and the No. 2 screw conveyor, can adjust the spacing between the No. 1 screw conveyor and the No. 2 screw conveyor, so that the extension tube slides along the axial direction of the receiving tube.

[0006] As a further preferred embodiment of this technical solution, a base plate is fixedly installed on the upper end of the scale body, and the base plate serves as a load-bearing component.

[0007] As a further preferred embodiment of this technical solution, the No. 1 screw conveyor and the No. 2 screw conveyor have the same structure. The No. 1 screw conveyor includes a fixed base, on which a bearing housing and a receiving bin are fixedly installed. A motor is fixedly installed at one end of the bearing housing, and the output shaft of the motor passes through the bearing housing. A bearing is provided between the outer wall of the output shaft of the motor and the inner wall of the bearing housing. The receiving bin is located on the side of the bearing housing away from the motor, and its upper end is open. A conveying pipe is fixedly installed on its side wall, and the conveying pipe is in communication with the interior of the receiving bin. A discharge pipe is provided at the end of the conveying pipe, and the interior of the discharge pipe is in communication with the interior of the conveying pipe. Its opening faces downward. A helical blade rod is provided at the axis of the conveying pipe, and one end of the helical blade rod passes through the receiving bin and is fixedly connected to the output shaft of the motor.

[0008] As a further preferred embodiment of this technical solution, the spacing adjustment mechanism includes a sleeve, a threaded rod, and a mounting base. The sleeve is fixedly connected to the fixed base of the first screw conveyor, with its opening facing downwards and an internal thread on its inner wall. The mounting base is fixedly mounted on the fixed base of the second screw conveyor, with its shaft being a hollow structure and a rotating groove on its inner wall. The bottom of the threaded rod is inserted into the mounting base, and a rotating plate is fixedly fitted onto its bottom outer wall. The rotating plate is located within the rotating groove, and the rotating plate is rotatably adapted to the rotating groove. The upper end of the threaded rod is inserted into the bottom of the sleeve, and the threaded rod is threadedly engaged with the sleeve. An adjustment plate, which is hexagonal in shape, is also fixedly fitted onto the exposed outer wall of the threaded rod.

[0009] As a further preferred embodiment of this technical solution, the spacing adjustment mechanism further includes guide rods and guide members. There are two guide rods, both of which are fixedly installed on the upper end of the base plate and symmetrically distributed on both sides of the No. 1 screw conveyor. Guide members are fixedly installed on both sides of the fixed seat of the No. 1 screw conveyor. Guide grooves are provided on the guide members, and the guide rods are located in the guide grooves and are slidably adapted to the guide grooves.

[0010] As a further preferred embodiment of this technical solution, a threaded hole is provided on the side wall of one of the guide members, the threaded hole extends into the guide groove, and a locking bolt is provided in the threaded hole, the outer wall of the locking bolt being threadedly engaged with the inner wall of the threaded hole.

[0011] As a further preferred embodiment of this technical solution, a protective sleeve is fitted on the outer wall of the sleeve, the protective sleeve is slidably adapted to the sleeve, and the bottom of the protective sleeve is fixedly connected to the adjusting plate to achieve protection of the threaded rod.

[0012] This invention provides a feed control device for a mixer, which has the following advantages: (1) By adding a differential compensation channel, the present invention utilizes the principle that suspended materials in the differential compensation channel cannot be weighed by the scale body. When the scale body detects that the material reduction reaches the preset value and triggers the stop signal, the suspended material just compensates for the extra feeding during the delay period, which completely solves the problem of excessive feeding caused by signal delay in the feeding control of traditional loss-in-weight scales, ensures that the actual feeding amount is highly consistent with the preset feeding amount, ensures the accuracy of subsequent material mixing ratio, and thus improves the stability of final product quality.

[0013] (2) The present invention can conveniently adjust the distance between the No. 1 screw conveyor and the No. 2 screw conveyor by means of the spacing adjustment mechanism, thereby flexibly adjusting the length of the differential compensation channel and the amount of suspended material, so as to adapt to materials with different flowability and different density. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the overall structure of the present invention; Figure 3 In this invention Figure 2 A sectional diagram; Figure 4 This is a schematic diagram of the differential compensation channel in this invention; Figure 5 This is a partial schematic diagram of the spacing adjustment mechanism in this invention; Figure 6 This is another schematic diagram of the spacing adjustment mechanism in this invention; Figure 7 This is a schematic diagram of the No. 1 screw conveyor in this invention.

[0015] In the diagram: 1. Scale body; 11. Base plate; 2. Storage bin; 3. No. 1 screw conveyor; 31. Fixed base; 32. Motor; 33. Bearing housing; 34. Receiving bin; 35. Conveying pipe; 36. Screw blade rod; 37. Discharge pipe; 4. No. 2 screw conveyor; 5. Spacing adjustment mechanism; 51. Sleeve; 52. Threaded rod; 521. Adjusting plate; 522. Rotating plate; 53. Mounting base; 531. Rotating groove; 54. Protective cylinder; 55. Guide rod; 56. Guide component; 561. Guide groove; 562. Threaded hole; 57. Locking bolt; 6. Differential compensation channel; 61. Extension pipe; 62. Storage pipe. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] This invention provides a technical solution: such as Figure 1 As shown, in this embodiment, a mixer feeding control device includes a weighing body 1, a storage bin 2, a first screw conveyor 3, a second screw conveyor 4, a differential compensation channel 6, and a spacing adjustment mechanism 5. like Figure 1 As shown, the weighing body 1 is a CW-1000 loss-in-weight scale, which is used to weigh the amount of material loss in real time and transmit the weight signal to the control unit. The control unit is an existing conventional PLC controller, model S7-200. The upper end of the weighing body 1 is fixedly mounted with a base plate 11 by bolts, which serves as a load-bearing unit and is used to install components such as the second screw conveyor 4 and guide rod 55.

[0018] like Figure 1 As shown, the storage bin 2 is made of stainless steel and is suspended above the scale body 1. It is used to store the materials to be conveyed. The bottom of the storage bin 2 is provided with a discharge port, which guides the materials into the No. 1 screw conveyor 3.

[0019] like Figure 1 As shown, screw conveyor 3 and screw conveyor 4 have the same structure and both use horizontal screw conveyors of model LS200.

[0020] like Figure 1 As shown, the first screw conveyor 3 is located at the bottom of the receiving bin 2. The upper opening of its receiving bin 34 is fixedly connected to the discharge port of the receiving bin 2 via a flange, thereby achieving mutual communication between the inlet and the outlet of the receiving bin 2. Figure 7As shown, the No. 1 screw conveyor 3 includes a fixed base 31, a motor 32, a bearing housing 33, a receiving bin 34, a conveying pipe 35, a screw blade rod 36, and a discharge pipe 37. The fixed base 31 is welded from Q235 steel plate. The motor 32 is a Y90L-4 three-phase asynchronous motor, which is bolted to one end of the bearing housing 33. The bearing housing 33 is fixedly mounted on the fixed base 31. The output shaft of the motor 32 passes through the bearing housing 33, and a 6205 deep groove ball bearing is installed between the outer wall of the output shaft of the motor 32 and the inner wall of the bearing housing 33. The receiving bin 34 is made of stainless steel and has an open top. It is located away from the motor on the bearing housing 33. One side of the machine 32 is fixed to the fixed base 31 by bolts. The conveying pipe 35 is made of stainless steel. One end of it is fixed to the side wall of the receiving bin 34 by welding and is in communication with the inside of the receiving bin 34. The end of the conveying pipe 35 is welded with the discharge pipe 37, which is in communication with the inside of the conveying pipe 35. The opening faces downward and is used to discharge the material to the differential compensation channel 6. The conveying pipe 35 has a spiral blade rod 36 at the axis. The spiral blade rod 36 is made of 45 steel. One end of it runs through the receiving bin 34 and is fixedly connected to the output shaft of the motor 32 by a coupling. The motor 32 drives the spiral blade rod 36 to rotate to realize the uniform conveying of materials.

[0021] like Figure 1 As shown, the second screw conveyor 4 is fixedly installed on the upper end of the base plate 11 by bolts and is located below the first screw conveyor 3. Its structure is exactly the same as that of the first screw conveyor 3. The upper opening of its receiving bin 34 is connected to the receiving pipe 62 of the differential compensation channel 6, which is used to receive the material conveyed by the differential compensation channel 6 and convey the material to the feed port of the mixer. The mixer is existing equipment and is not shown in the attached figure.

[0022] like Figure 1 As shown, the differential compensation channel 6 is used to connect the discharge port of screw conveyor 3 and the feed port of screw conveyor 4, so as to realize the suspension of local materials and compensate for the over-release of materials caused by signal transmission delay, such as... Figure 4 As shown, the differential compensation channel 6 includes an extension tube 61 and a receiving tube 62, both made of stainless steel. The extension tube 61 is located inside the receiving tube 62, and its outer wall is slidably adapted to the inner wall of the receiving tube 62, allowing it to slide along the axial direction of the receiving tube 62. This enables the length adjustment of the differential compensation channel 6, thereby adjusting the quantity of suspended materials and adapting to different signal delay times. The upper end of the extension tube 61 is fixedly connected to the discharge pipe 37 of the first screw conveyor 3 via a flange, and the lower end of the receiving tube 62 is fixedly connected to the receiving bin 34 of the second screw conveyor 4 via a flange.

[0023] like Figure 1As shown, the spacing adjustment mechanism 5 is located between the first screw conveyor 3 and the second screw conveyor 4, and is used to adjust the spacing between them, so that the extension tube 61 slides along the axial direction of the receiving tube 62, thereby adjusting the length of the differential compensation channel 6, as shown. Figure 4 As shown, the spacing adjustment mechanism 5 includes a sleeve 51, a threaded rod 52, and a mounting base 53. The sleeve 51 has an internal thread on its inner wall, and its upper end is fixedly connected to the fixed base 31 of the first screw conveyor 3 by welding, with the opening facing downwards. The mounting base 53 is made of 45# steel, and its shaft has a hollow structure. An annular rotating groove 531 is formed on its inner wall. The mounting base 53 is fixedly mounted on the fixed base 31 of the second screw conveyor 4 by welding. The threaded rod 52 is also made of 45# steel, and its upper outer wall has an external thread. Its bottom is inserted into the mounting base 53, and a rotating plate 522 is fixedly fitted onto its bottom outer wall by welding. The rotating plate 522 is annular... A shaped steel plate is located inside the rotating groove 531. The rotating plate 522 is rotatably adapted to the rotating groove 531, ensuring that the threaded rod 52 can rotate freely within the mounting base 53 without axial movement. The upper end of the threaded rod 52 is inserted into the bottom of the sleeve 51 and threadedly engages with the sleeve 51. By rotating the threaded rod 52, the sleeve 51 and the No. 1 screw conveyor 3 are driven to move up and down, thereby adjusting the distance between them. An adjusting plate 521 is also fixedly fitted onto the exposed outer wall of the threaded rod 52 by welding. The adjusting plate 521 has a hexagonal structure, which makes it easy to rotate the adjusting plate 521 with tools such as wrenches, thereby driving the threaded rod 52 to rotate and realizing convenient adjustment of the distance.

[0024] like Figure 5 As shown, a protective sleeve 54 is fitted on the outer wall of the sleeve 51. The protective sleeve 54 is made of stainless steel and is slidably adapted to the sleeve 51. The bottom of the protective sleeve 54 is fixedly connected to the adjusting plate 521 by welding to protect the threaded rod 52 and prevent material dust and debris from adhering to the threads of the threaded rod 52.

[0025] like Figure 6 As shown, the spacing adjustment mechanism 5 also includes guide rods 55 and guide members 56, which are used to guide the No. 1 screw conveyor 3 when it moves up and down, ensuring that its movement is smooth and avoiding deviation. There are two guide rods 55, both of which are fixedly installed on the upper end of the base plate 11 by bolts and are symmetrically distributed on both sides of the No. 1 screw conveyor 3. Guide members 56 are fixedly installed on both sides of the fixed seat 31 of the No. 1 screw conveyor 3 by welding. The guide members 56 are provided with guide grooves 561. The guide rods 55 are located in the guide grooves 561 and are slidably adapted to the guide grooves 561 to ensure that the No. 1 screw conveyor 3 moves smoothly along the length direction of the guide rods 55 during the spacing adjustment process.

[0026] like Figure 6As shown, a threaded hole 562 is provided on the side wall of a guide member 56, extending into the guide groove 561. A locking bolt 57 is provided in the threaded hole 562, and its outer wall is threadedly engaged with the inner wall of the threaded hole 562. After the spacing is adjusted, the locking bolt 57 is tightened so that the end of the locking bolt 57 abuts against the guide rod 55, thereby fixing the guide member 56 and the guide rod 55, and thus fixing the position of the first screw conveyor 3, preventing the spacing from shifting during operation, and ensuring the stability of the length of the difference compensation channel 6.

[0027] Work process: The material to be conveyed is poured into the receiving bin 2. The material enters the receiving bin 34 of the first screw conveyor 3 through the discharge port of the receiving bin 2. The control unit is started, and the preset feed weight and related parameters, such as the speed of the screw conveyor, are set. The control unit controls the motors 32 of the first screw conveyor 3 and the second screw conveyor 4 to start. The motors 32 drive the screw blade rods 36 to rotate, and the material conveying begins.

[0028] The weighing platform 1 measures the decrease in material in real time and transmits the weight signal to the control unit in real time. When the weighing platform 1 detects that the decrease in material has reached the preset value, the control unit immediately sends a stop feeding signal to control the motors 32 of the first screw conveyor 3 and the second screw conveyor 4 to stop working. Since the material in the difference compensation channel 6 is in a suspended state and cannot be weighed by the weighing platform 1, the total amount of material in the device at this time is greater than the value measured by the weighing platform 1. This part of the suspended material that is not weighed can just compensate for the overfeed caused by the signal transmission delay, ensuring that the actual feed amount is consistent with the preset feed amount.

[0029] Due to different materials and different conveying speeds, there may be discrepancies in the amount of material discharged due to signal transmission delay. In this case, by turning the adjusting plate 521 with a wrench, the threaded rod 52 is rotated. Since the threaded rod 52 is threadedly engaged with the sleeve 51, and the guide rod 55 and guide member 56 restrict the rotation of the first screw conveyor 3, the sleeve 51 drives the first screw conveyor 3 to move up and down, thereby adjusting the distance between the first screw conveyor 3 and the second screw conveyor 4, so that the extension tube 61 slides along the axial direction of the receiving tube 62, adjusting the length of the difference compensation channel 6, and thus adjusting the amount of suspended material, ensuring that the amount of suspended material can compensate for the amount of material discharged due to signal transmission delay. The specific amount needs to be tested. After the adjustment is completed, tighten the locking bolt 57 to fix the position of the first screw conveyor 3.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A feed control device for a mixer, characterized in that, include: Weighing body (1), the weighing body (1) is used to weigh the amount of material reduction; The storage compartment (2) is suspended above the weighing body (1) and is used to store materials; The No. 1 screw conveyor (3) is located at the bottom of the receiving bin (2), and its inlet is connected to the outlet of the receiving bin (2) to achieve uniform material conveying. The second screw conveyor (4) is located on the weighing body (1) and below the first screw conveyor (3); The differential compensation channel (6) connects the discharge port of the first screw conveyor (3) and the feed port of the second screw conveyor (4) to realize the suspension of local materials in order to compensate for the over-release of materials caused by signal transmission delay. It includes an extension pipe (61) and a receiving pipe (62). The extension pipe (61) is located inside the receiving pipe (62) and can slide along the axial direction of the receiving pipe (62) to realize the length adjustment of the differential compensation channel (6) and thus realize the quantity adjustment of the suspended materials. The spacing adjustment mechanism (5) is located between the first screw conveyor (3) and the second screw conveyor (4), and can adjust the spacing between the first screw conveyor (3) and the second screw conveyor (4) so ​​that the extension tube (61) slides along the axial direction of the receiving tube (62).

2. The mixer feed control device according to claim 1, characterized in that: The upper end of the scale body (1) is fixedly mounted with a base plate (11), which serves as a load-bearing component.

3. The mixer feed control device according to claim 1, characterized in that: The No. 1 screw conveyor (3) and the No. 2 screw conveyor (4) have the same structure. The No. 1 screw conveyor (3) includes a fixed base (31), on which a bearing seat (33) and a receiving bin (34) are fixedly installed. A motor (32) is fixedly installed at one end of the bearing seat (33). The output shaft of the motor (32) passes through the bearing seat (33). A bearing is provided between the outer wall of the output shaft of the motor (32) and the inner wall of the bearing seat (33). The receiving bin (34) is located in the bearing seat (33) away from the motor. On one side of 32), the upper end is open, and a conveying pipe (35) is fixedly installed on its side wall. The conveying pipe (35) is in communication with the inside of the receiving bin (34). The end of the conveying pipe (35) is provided with a discharge pipe (37). The inside of the discharge pipe (37) is in communication with the inside of the conveying pipe (35), and its opening faces downward. A spiral blade rod (36) is provided at the axis of the conveying pipe (35). One end of the spiral blade rod (36) runs through the receiving bin (34) and is fixedly connected to the output shaft of the motor (32).

4. The mixer feed control device according to claim 2, characterized in that: The spacing adjustment mechanism (5) includes a sleeve (51), a threaded rod (52), and a mounting base (53). The sleeve (51) is fixedly connected to the fixed base (31) of the first screw conveyor (3), with its opening facing downwards and an internal thread on its inner wall. The mounting base (53) is fixedly mounted on the fixed base (31) of the second screw conveyor (4), with its shaft being a hollow structure and a rotating groove (531) on its inner wall. The bottom of the threaded rod (52) is inserted into the mounting base (53). 3) Inside, a rotating plate (522) is fixedly sleeved on the bottom outer wall. The rotating plate (522) is located in the rotating groove (531). The rotating plate (522) and the rotating groove (531) are rotatably adapted. The upper end of the threaded rod (52) is inserted into the bottom of the sleeve (51). The threaded rod (52) and the sleeve (51) are threaded together. An adjusting plate (521) is also fixedly sleeved on the exposed outer wall of the threaded rod (52). The adjusting plate (521) has a hexagonal structure.

5. The mixer feed control device according to claim 4, characterized in that: The spacing adjustment mechanism (5) further includes guide rods (55) and guide members (56). There are two guide rods (55). Both guide rods (55) are fixedly installed on the upper end of the base plate (11) and symmetrically distributed on both sides of the first screw conveyor (3). Guide members (56) are fixedly installed on both sides of the fixed seat (31) of the first screw conveyor (3). The guide members (56) are provided with guide grooves (561). The guide rods (55) are located in the guide grooves (561) and are slidably adapted to the guide grooves (561).

6. The mixer feed control device according to claim 5, characterized in that: A threaded hole (562) is provided on the side wall of one of the guide members (56), the threaded hole (562) extends into the guide groove (561), and a locking bolt (57) is provided in the threaded hole (562), the outer wall of the locking bolt (57) is threadedly engaged with the inner wall of the threaded hole (562).

7. The mixer feed control device according to claim 4, characterized in that: A protective sleeve (54) is fitted on the outer wall of the sleeve (51). The protective sleeve (54) is slidably adapted to the sleeve (51). The bottom of the protective sleeve (54) is fixedly connected to the adjusting plate (521) to achieve protection of the threaded rod (52).

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