Meter weight controller for plastic pipe production

Abstract

The utility model discloses a meter weight controller for plastic pipe production. The meter weight controller comprises a storage hopper, a feeding port, a conveying cylinder, a left baffle, a right baffle, a discharging nozzle, a control valve, a gravity sensor, a controller, a discharging port, a protective cover, a scraper, a rotating rod, a motor and an auxiliary rod. The conveying cylinder is arranged in the storage hopper, and the left baffle and the right baffle which are distributed in a staggered mode are arranged in the conveying cylinder, so that the free falling motion trail of raw materials is changed into the inclined sliding motion trail, the motion speed of the raw materials is reduced, and the raw materials fall onto the gravity sensor from the discharging nozzle at a low speed; the problems that the gravity sensor is impacted and the calculation accuracy is poor are avoided; meanwhile, liquid splashing generated when raw materials make contact with the gravity sensor is reduced. The scraper is arranged outside the induction ball of the gravity sensor and can scrape raw materials on the induction ball in time, so that the contact top end of the induction ball is kept clean, and induction is more accurate. The weight per meter is always kept to the lowest standard, so that raw materials are saved and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic pipe production equipment, in particular to a meter weight controller for plastic pipe production. Background Art

[0002] The meter weight controller is the basis of the automation of the plastic pipe extrusion production line. The basic principle of the meter weight controller: due to the change in raw material density, the feed amount changes during extrusion, and these changes have a considerable impact on the meter weight, and therefore also affect the quality of the product. Manual adjustment of the traction speed or extrusion speed can temporarily compensate for these changes, but it reduces the stability of the entire extrusion process. Therefore, it is necessary to automatically complete the measurement, calculation, output of each link, and closed-loop control to achieve the purpose. It can perform continuous and highly accurate gravity metering and high-level monitoring of solid and liquid materials. The hopper scale suitable for a variety of materials can adjust the meter weight and extrusion volume by recording measurement data and integrating the control system. Through the precise extrusion volume and the control of the weight per meter of continuous products, stable production with less material consumption can be achieved, meeting the dual needs of improving product quality and saving raw materials, and obtaining the most detailed production plan and ensuring the stability of the product production process.

[0003] The existing meter weight controller uses advanced digital electronic technology to measure at high speed, calculates meter weight (kg / m) and extrusion volume (kg / hr), and compares the set value of the production formula to perform closed-loop control to save raw materials and ensure quality. It can be installed on any extruder, and controls the extrusion volume by collecting the extruder host speed and controlling the extruder RPM. The existing meter weight controller works with the extruder, and its efficiency is low, energy consumption is high, and cost is high.

[0004] CN206161124U discloses a meter weight controller, including a feed port, a discharge port, a chassis and a control module, wherein the chassis includes: an upper bin, which is arranged at the top of the chassis and communicates with the feed port; a control valve, which is arranged on the discharge nozzle of the upper bin; an impact plate, which is arranged directly below the discharge nozzle and is separated from the discharge nozzle by a distance; and an impact sensing device, which is arranged below the impact plate. The material is allowed to fall freely from a certain height, and the control module uses a function to calculate the total mass of the material passing through according to the impact force and time on the impact plate that receives the impact of the material. However, since the raw material on the impact plate has a low flow rate based on weight alone, the raw material will stay on the impact plate, affecting the accuracy of the sensing.

[0005] CN210211277U discloses an automatic control system for a meter weight device, including a chassis, a storage bin with an inlet connected to the feeding port of the chassis at the upper part of the chassis, a control valve that can control the flow of raw materials at the discharge nozzle at the lower end of the storage bin, a sensing device at a certain distance from the discharge nozzle is set directly below the discharge nozzle, the sensing device includes a hollow sensing ball, a sensing sticker is set on the inner wall of the sensing ball, an arc-shaped fixed scraper is set on the outside of the sensing ball, and a rotating component that can make the sensing ball rotate is set on the outside of the sensing ball. Compared with the original calculation by extrusion volume, the utility model has high efficiency and low cost; at the same time, a scraper can be set on the outside of the sensing ball to keep the contact top of the sensing ball clean, making the sensing more accurate. However, the sensing device receives the impact force information and time information of the falling raw material and uses a function to calculate the weight of the raw material and the input speed of the raw material. The sensing device is easily affected by the impact of the free fall of the raw material, and there are problems of the impact of the sensing device and the accuracy of the calculation. Summary of the invention

[0006] The purpose of the utility model is to solve the deficiencies of the prior art and to provide a meter weight controller for plastic pipe production.

[0007] In order to achieve the above object, the utility model provides the following technical solutions:

[0008] A meter weight controller for plastic pipe production comprises a storage hopper, a feed port, a conveying cylinder, a left baffle, a right baffle, a discharge nozzle, a control valve, a gravity sensor, a controller, a discharge port, a protective cover, a scraper, a rotating rod, a motor, and an auxiliary rod.

[0009] The upper part of the storage hopper is cylindrical, the middle part is a funnel with a diameter that decreases from top to bottom, and the lower part is cylindrical; the feed port is located at the center of the top of the storage hopper, the conveying cylinder is located on the central axis inside the storage hopper, the upper end of the conveying cylinder is connected to the feed port, and the inside of the conveying cylinder is provided with left and right baffles that are staggered from the upper end to the lower end, and the left and right baffles are both inclined downward, the lower end of the conveying cylinder is connected to the discharge nozzle, and a control valve is provided at the discharge nozzle, and a gravity sensor is provided directly below the discharge nozzle, the discharge port is located at the very bottom of the storage hopper, a protective cover is provided around the discharge port, and the controller is provided on the outer wall of the storage hopper.

[0010] By adopting the above technical scheme, the raw materials fall into the conveying cylinder from the feed port of the storage hopper, and are repeatedly blocked by the left and right baffles that are staggered to the discharge nozzle, thereby changing the free fall motion trajectory of the raw materials into an inclined sliding motion trajectory, reducing the movement speed of the raw materials, and achieving the goal of the raw materials falling from the discharge nozzle to the gravity sensor at a low speed, thereby avoiding the impact of the gravity sensor and the problem of calculation accuracy; at the same time, reducing the liquid splashing caused by the raw materials contacting the gravity sensor.

[0011] Furthermore, the upper part, the middle part, the lower part, the feed port, the conveying cylinder, the discharge nozzle, the gravity sensor, the discharge port, and the protective cover of the storage hopper are coaxially arranged and the axis passes through the center of the discharge nozzle.

[0012] Furthermore, the gravity sensor is located directly below the discharge nozzle, and the longest distance between the discharge nozzle and the gravity sensor is 20 mm-30 mm.

[0013] Further, the gravity sensor may be one or more integrated gravity sensors, which will automatically compensate for potential fluctuations caused by bulk density.

[0014] Furthermore, the gravity sensor is a hollow sensing ball, an arc-shaped fixed scraper is arranged outside the sensing ball, the inner arc of the scraper corresponds to the spherical surface of the sensing ball, and the inner arc radius of the scraper is larger than the spherical radius of the sensing ball.

[0015] Furthermore, a rotating rod is arranged outside the sensing ball, one end of the rotating rod is fixedly connected to the output end of the motor, the motor is fixedly arranged on the outer wall of the storage hopper, and an auxiliary rod is arranged at the other end of the sensing ball. The rotating rod and the auxiliary rod are arranged coaxially and the axis passes through the center of the sensing ball.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model adopts a conveying cylinder arranged in the storage hopper, and a left baffle and a right baffle which are staggered and distributed mutually, so as to change the free fall motion trajectory of the raw materials into an inclined sliding motion trajectory, reduce the movement speed of the raw materials, and realize that the raw materials fall from the discharge nozzle to the gravity sensor at a low speed, thereby avoiding the impact of the gravity sensor and the problem of calculation accuracy; at the same time, it reduces the liquid splashing caused by the raw materials contacting the gravity sensor.

[0018] 2. A scraper can be provided outside the sensing ball of the gravity sensor in the utility model. With the rotation and movement of the sensing ball, the scraper can timely scrape off the material on the sensing ball, so that the contact top of the sensing ball remains clean, making the sensing more accurate.

[0019] 3. The meter weight controller of the utility model can always keep the meter weight to the minimum standard, stabilize the fluctuation caused by raw materials, make the production process smoother and more stable, control the tolerance to be stable, improve the consistency of products, reduce the scrap rate, thereby saving raw materials and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] Figure 1 The utility model is a schematic diagram of the structure of a meter weight controller for plastic pipe production.

[0023] Figure 1 Shown in: 1. Storage hopper, 2. Feed port, 3. Conveying cylinder, 4. Left baffle, 5. Right baffle, 6. Discharge nozzle, 7. Control valve, 8. Gravity sensor, 9. Controller, 10. Discharge port, 11. Protective cover, 12. Auxiliary rod, 13. Scraper, 14. Rotating rod, 15. Motor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The terms such as "left", "right", "upper", "lower" etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships shall be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0026] Reference Figure 1 The utility model discloses a meter weight controller for plastic pipe production, including a storage hopper 1, a feed port 2, a conveying cylinder 3, a left baffle 4, a right baffle 5, a discharge nozzle 6, a control valve 7, a gravity sensor 8, a controller 9, a discharge port 10, a protective cover 11, an auxiliary rod 12, a scraper 13, a rotating rod 14, and a motor 15.

[0027] The upper end of the conveying cylinder 3 is arranged at the center of the top of the storage hopper 1, and is connected to the feed port 2 at the center of the top circle of the storage hopper. The conveying cylinder 3 is provided with a left baffle 4 and a right baffle 5 which are staggered from the upper end to the lower end. The left baffle 4 and the right baffle 5 are both inclined downward to change the free fall motion trajectory of the raw material to an inclined sliding motion trajectory, thereby reducing the movement speed of the raw material.

[0028] A control valve 7 for controlling the flow of raw materials is provided at the discharge nozzle 6 at the lower part of the storage hopper 1 , and the control valve 7 can control the discharge speed of the storage hopper 1 .

[0029] Furthermore, a gravity sensor 8 that can sense the weight and speed of the falling raw materials is arranged directly below the discharge nozzle 6. The maximum distance between the discharge nozzle 6 and the gravity sensor 8 is 20 mm-30 mm, so that the raw materials fall from the discharge nozzle 6 to the gravity sensor 8 at a low speed, avoiding the impact of the gravity sensor 8 and the problem of calculation accuracy, while reducing the liquid splashing caused by the raw material contacting the gravity sensor 8.

[0030] Furthermore, an arc-shaped fixed scraper 13 is arranged outside the gravity sensor 8 , and the inner arc of the scraper 13 corresponds to the spherical surface of the gravity sensor 8 . The scraper 13 is used to scrape the raw materials on the surface of the gravity sensor 8 .

[0031] Furthermore, a rotating rod 14 is arranged outside the gravity sensor 8, and the rotating rod 14 is arranged horizontally. One end of the rotating rod 14 is fixedly connected to the output end of the motor 15, and the motor 15 is fixedly arranged on the outer wall of the storage hopper 1. The motor 15 drives the rotating rod 14 to rotate, so that the gravity sensor 8 rotates.

[0032] Furthermore, a rotating rod 14 is provided at one end of the gravity sensor 8, and an auxiliary rod 12 is provided at the other end of the gravity sensor 8. The rotating rod 14 and the auxiliary rod 12 are coaxially arranged and the axis passes through the center of the gravity sensor 8. The rotating rod 14 and the auxiliary rod 12 are both rotatably connected to the storage hopper 1 through bearings, and the auxiliary rod 12 is used to auxiliary support the gravity sensor 8 and the scraper 13.

[0033] The scraper 13 cooperates with the rotation and movement of the gravity sensor 8. The fixed scraper 13 can scrape off the raw materials on the gravity sensor 8 in time, so that the contact top of the gravity sensor 8 remains clean, making the sensing more accurate.

[0034] The working process of this embodiment is as follows:

[0035] The raw material enters the conveying cylinder 3 from the feed port 2 of the storage hopper 1. After the raw material passes through the left baffle 4 and the right baffle 5 which are staggered with each other, the free fall motion trajectory is changed to an inclined sliding motion trajectory, and the raw material slides to the discharge nozzle 6, and then falls to the gravity sensor 8 at a low speed. The gravity sensor 8 senses the gravity and time information of the raw material. The controller 9 uses the function to calculate the weight of the raw material and the input speed of the raw material. At the same time, the motor 15 drives the sensing ball of the gravity sensor 8 to rotate, and the fixed scraper 13 scrapes the raw material on the surface of the sensing ball of the gravity sensor 8, so that the top of the sensing ball of the gravity sensor 8 remains clean and the sensing is more accurate. The scraper 13 hangs the raw material and the raw material flows out from the discharge port 10 of the storage hopper 1.

[0036] Of course, the embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A meter weight controller for plastic pipe production, characterized in that: The invention comprises a storage hopper (1), a feed port (2), a conveying cylinder (3), a left baffle (4), a right baffle (5), a discharge nozzle (6), a control valve (7), a gravity sensor (8), a controller (9), a discharge port (10), a protective cover (11), an auxiliary rod (12), a scraper (13), a rotating rod (14), and a motor (15); the upper part of the storage hopper (1) is cylindrical, the middle part is a funnel with a diameter that decreases from top to bottom, and the lower part is cylindrical; the feed port (2) is located at the center of the top of the storage hopper (1); the conveying cylinder (3) is located on the central axis of the storage hopper (1); the upper end of the conveying cylinder (3) is The conveying cylinder (3) is connected to the feed port (2), and a left baffle (4) and a right baffle (5) are arranged inside the conveying cylinder (3) from the upper end to the lower end, and the left baffle (4) and the right baffle (5) are both inclined downward. The lower end of the conveying cylinder (3) is connected to the discharge nozzle (6), and a control valve (7) is arranged at the discharge nozzle (6). A gravity sensor (8) is arranged directly below the discharge nozzle (6). The discharge port (10) is located at the bottom of the storage hopper (1), and a protective cover (11) is arranged around the discharge port (10). The controller (9) is arranged on the outer wall of the storage hopper (1).

2. A meter weight controller for plastic pipe production according to claim 1, characterized in that: The upper part, the middle part, the lower part, the feed port (2), the conveying cylinder (3), the discharge nozzle (6), the gravity sensor (8), the discharge port (10), and the protective cover (11) of the storage hopper (1) are coaxially arranged, and the axis passes through the center of the discharge nozzle (6).

3. A meter weight controller for plastic pipe production according to claim 1, characterized in that: The gravity sensor (8) is located directly below the discharge nozzle (6), and the longest distance between the discharge nozzle (6) and the gravity sensor (8) is 20 mm-30 mm.

4. A meter weight controller for plastic pipe production according to claim 1, characterized in that: The gravity sensor (8) is one or more integrated gravity sensors (8) that can automatically compensate for potential fluctuations caused by bulk density.

5. A meter weight controller for plastic pipe production according to claim 1, characterized in that: The gravity sensor (8) is a hollow sensing ball, and an arc-shaped fixed scraper (13) is arranged outside the sensing ball; the inner arc of the scraper (13) corresponds to the spherical surface of the sensing ball, and the inner arc radius of the scraper (13) is larger than the spherical surface radius of the sensing ball.

6. A meter weight controller for plastic pipe production according to claim 1, characterized in that: A rotating rod (14) is arranged outside the sensing ball of the gravity sensor (8), one end of the rotating rod (14) is fixedly connected to the output end of a motor (15), and the motor (15) is fixedly arranged on the outer wall of the storage hopper (1), and an auxiliary rod (12) is arranged at the other end of the sensing ball, and the rotating rod (14) and the auxiliary rod (12) are coaxially arranged, and the axis passes through the center of the sensing ball.

7. A meter weight controller for plastic pipe production according to claim 1, characterized in that: A control valve (7) for controlling the flow of raw materials is provided at the discharge nozzle (6) at the bottom of the storage hopper (1).

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