A self-weight metering mixer control device

Abstract

The application discloses a self-weight metering mixer control device, which comprises a mixer, a hinged seat connected to the mixer, a lever hinged to the hinged seat and capable of swinging up and down in a vertical plane, a hinged point of the lever being located on a lever body of the lever, one end of the lever being connected to a storage tank and the other end of the lever being vertically applied to a weighing sensor, the weighing sensor being electrically connected to a control processor, wherein a force arm length from the hinged point to the storage tank is L1, a force arm length from the hinged point to the weighing sensor is L2, L1 is greater than L2, and N=L1 / L2, the gravity of the storage tank is expanded N times by the lever and applied to the weighing sensor, the weighing sensor transmits a force signal to the control processor, and the control processor reduces the measurement value of the weighing sensor by N times to obtain the real weight of the storage tank. The application can obviously reduce the proportion of the device affected by external vibration, can reduce the adverse effect of vibration, can improve the measurement precision of the storage tank, and can further improve the material metering accuracy of the mixer.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, and specifically to a control device for a self-weight metering mixer. Background Technology

[0002] A mixer is a type of construction machinery primarily used for mixing building materials such as cement, sand, gravel, and various dry-mix mortars. It is a machine with rotating blades on a shaft within a cylinder or trough, mixing multiple raw materials to create a mixture or a material of suitable consistency. There are various types of mixers, including forced-action mixers, single-shaft mixers, and twin-shaft mixers. Currently, mixers are typically equipped with a weight-measuring control device to precisely control the input of each raw material, achieving the desired proportions for the production process and improving the properties of the mixed material.

[0003] There are various structures for the control device for self-weight measurement. For example, in the prior art, Chinese utility model patent with announcement number CN2642487Y discloses a metering mortar mixer. It adds a hopper above the mortar mixer as a metering container. The weighing sensor generates electronic information of the corresponding weight, and the feeding amount of the material is controlled by an electronic control box to complete the superimposed weighing and metering of different materials such as sand, cement and water.

[0004] For example, Chinese utility model patent CN203090855U discloses a self-weight metering mixer control device. It uses a weighing sensor to transmit and display signals through an amplification and conditioning circuit, an A / D conversion circuit, and a CPU. The CPU outputs a control signal to control the opening and closing of the feeding solenoid valve, thereby realizing the detection and control of materials and ensuring the detection and control accuracy of materials.

[0005] For example, Chinese patent document CN102853885A discloses a material metering device, which includes a metering container, a support, and a controller. The metering container is placed on the support, and a first valve is provided in the feed channel of the metering container to control the size of the conduction area of ​​the feed channel. A weighing sensor is provided between the metering container and the support to measure the weight of the metering container in real time. The controller is electrically connected to the weighing sensor via a line or a wireless signal transceiver. The controller is used to acquire the weight of the metering container and control the size of the conduction area of ​​the feed channel of the metering container by adjusting the opening of the first valve according to the pre-stored correspondence between the conduction area and the weight of the metering container.

[0006] All of the above patent documents use weighing sensors to weigh raw materials. Although they can measure the weight of raw materials, when the self-weight measurement control device is used in conjunction with a mixer, especially when the self-weight measurement control device is integrated with the mixer, the adverse effects of vibration generated during the operation of the mixer are not taken into account. Precision weighing sensors often exhibit large measurement errors under vibration conditions (a weighing sensor is a device that converts force into voltage or current in real time, and changes in force caused by external vibration directly affect the output signal). It is not suitable for environments where precise input quantities are required.

[0007] Therefore, for mixers operating in environments with significant vibration, there is an urgent need for a material control device with accurate metering. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a control device for a self-weight metering mixer.

[0009] The present invention adopts the following technical solution:

[0010] A self-weight metering mixer control device includes a mixer with a hinged base connected to it. A lever that can swing up and down in a vertical plane is hinged to the hinged base, with its hinge point located on the lever's shaft. One end of the lever is connected to a storage tank, and the other end acts vertically on a load cell. The load cell is electrically connected to a control processor. The lever arm length from the hinge point to the storage tank is L1, and the lever arm length from the hinge point to the load cell is L2. L1 is greater than L2, and N = L1 / L2. The weight of the storage tank is amplified N times by the lever and acts on the load cell. The load cell transmits the force signal to the control processor, which reduces the measured value of the load cell by a factor of N to obtain the true weight of the storage tank.

[0011] Based on the above technical solutions, the following further technical solutions are possible;

[0012] When the loads at both ends of the lever are balanced, the lever is in a horizontal state.

[0013] The lever end on one side of the load cell is provided with a vertically upward force transmission rod. The upper end surface of the force transmission rod is a plane, and this plane is in contact with the detection plane of the load cell.

[0014] The weighing sensor is fixed on the weighing bracket, which is connected to the mixer through a vibration damping device. The vibration damping device includes a sealed box with a vibration damping body inside. When the vibration damping device is subjected to vibration, the vibration damping body can move and collide within the box to dissipate vibration energy.

[0015] The vibration damper is made of particulate matter.

[0016] The particulate matter includes gravel, rubber particles, and plastic particles.

[0017] The vibration damper includes a sealed shell, and movable particles are disposed inside the sealed shell.

[0018] The sealed shell is a spherical shell.

[0019] The hinged seat is connected to the mixer via a vibration damping device.

[0020] The mixer is also equipped with a limiting bracket, which includes a limiting seat. The limiting seat has a limiting plate that is fitted with the side wall of the storage tank and a bearing plate that is fitted with the lower part of the storage tank. When the storage tank is disassembled or installed, the limiting plate restricts the storage tank from tilting and the bearing plate supports the storage tank 4, so that the storage tank is temporarily supported.

[0021] Compared with existing technologies, the present invention has the following advantages:

[0022] This solution amplifies the weight of the storage tank using a lever principle and applies it to the weighing sensor. The control processor then proportionally reduces the measured value from the weighing sensor to obtain the true weight of the storage tank. Compared to existing technologies, the amplified weight measured by the weighing sensor is significantly less affected by external vibrations, thus reducing the adverse effects of vibrations, improving the measurement accuracy of the storage tank, and consequently improving the material metering accuracy of the mixer.

[0023] In addition, by setting up a vibration damping device and installing a vibration damping body inside the box, the vibration energy is consumed by the vibration damping body moving and colliding, so as to achieve the purpose of vibration reduction and further reduce the adverse effects of vibration on the measurement accuracy of the weighing sensor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a self-weight metering mixer control device according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the vibration damping device in a self-weight metering mixer control device according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the combined structure of the vibration damping body in a self-weight metering mixer control device according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Mixer; 1a. Feed inlet; 2. Hinge seat; 3. Lever; 4. Storage tank; 5. Force transmission rod; 6. Weighing sensor; 7. Weighing bracket; 8. Control processor; 9. Vibration damping device; 91. Box body; 92. Door body; 93. Vibration damping body; 93a. Sealed shell; 93b. Particles; 10. Limiting bracket; 10a. Limiting seat; 10b. Limiting plate; 10c. Bearing plate. Detailed Implementation

[0028] To make the present invention clearer, a self-weight metering mixer control device of the present invention will be further described below with reference to the accompanying drawings. The specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0029] like Figure 1 As shown, a self-weight metering mixer control device includes a mixer 1 with a feed inlet 1a at the top. A hinge seat 2 is connected to the top wall of the mixer 1. The hinge seat 2 consists of two side support plates and a connected bottom plate. It is hinged to a lever 3 through a shaft + hole structure, and the hinge point between the hinge seat 2 and the lever 3 is located on the rod of the lever 3. The lever 3 itself can swing around the hinge point in the vertical plane, that is, the lever 3 has only one degree of freedom of rotation around the hinge point. Here, the lever 3 can be a single straight rod or a long frame composed of multiple rods. Under the premise of meeting the requirements of strength and stiffness, the lever 3 is made of a lightweight material, such as aluminum alloy or carbon fiber, to reduce the influence of its own weight on the balance of the lever. A storage tank 4 for storing precisely dispensed materials is fixedly connected to the left end of the lever 3 by bolts. The storage tank 4 is a cylindrical structure with a cone at the bottom, and is vertically arranged. Its lower port is located directly above the feed inlet 1a. The storage tank 4 is fixedly connected only to the lever 3. A vertically upward force transmission rod 5 is welded and fixed to the other end of the lever 3. The upper surface of the force transmission rod 5 is horizontal, and this plane is parallel to and in contact with the detection plane of the load cell 6, so as to ensure that the force of the lever 3 acts vertically on the detection plane of the load cell 6. The load cell 6 is connected to the top wall of the mixer 1 through the weighing bracket 7. Specifically, the weighing bracket 7 can adopt a structure with a cantilever beam connected to one side of the support column, and the load cell 6 is fixed at its cantilever end, with the detection surface of the load cell 6 facing downward. Of course, the weighing bracket 7 can also adopt other structural forms to meet the requirements of installing the load cell 6 and ensuring force stability. The load cell 6 is electrically connected to the control processor 8, which receives and processes the data from the load cell 6.

[0030] When the device is operating normally, lever 3 is in a balanced, static state. The lever arm length from the hinge point to the center of gravity of the storage tank 4 is L1, and the lever arm length from the hinge point to the contact point of the weighing sensor is L2. L1 is greater than L2, and N = L1 / L2. The specific values ​​of the lever arm lengths L1 and L2 can be set according to the measurement accuracy of the weighing sensor 6. The total weight of the storage tank 4 (including the internal raw materials) is amplified N times by lever 3 and then acts on the weighing sensor 6. The weighing sensor 6 transmits the force signal to the control processor 8. The control processor 8 reduces the measured value of the weighing sensor 6 by N times to obtain the true weight of the storage tank 4. Here, the control processor 8 is existing technology, and its specific structure is not limited, as long as it achieves the above functions. Since the impact of external vibration on the detection accuracy of the weighing sensor 6 is only within a certain range, for example, the vibration influence error of a certain weighing sensor is ±1kg, and the mixing demand of the mixer is 20kg per mixing cycle, without this device, the weighing error rate under the influence of vibration (excluding the measurement error of the weighing sensor itself) is 5%. However, with this device, assuming the value of N is 5, the detection value of the weighing sensor 6 under the influence of vibration is 5 x 20kg ± 1kg, and the value after processing by the control processor 8 is 20kg ± 0.2kg. The weighing error rate under the influence of vibration (excluding the measurement error of the weighing sensor itself) is 1%. It can be seen that this device can reduce the adverse effects of vibration and improve the measurement accuracy of the storage tank.

[0031] In some embodiments, it is preferable that the lever 3 is in a horizontal state when the loads at both ends are balanced. The lever arm length L1 is the distance between the vertical line of the storage tank 4 through the center of gravity and the vertical line through the hinge point; the lever arm length L2 is the distance between the vertical line of the point of action on the detection plane of the weighing sensor 6 and the vertical line through the hinge point.

[0032] To reduce the impact of vibration on the weighing sensor 6 and the hinge seat 2, in some embodiments, the weighing bracket 7 and the hinge seat 2 are respectively fixedly connected to the mixer 1 via a vibration damping device 9. Figure 2 As shown, the vibration damping device 9 includes a sealed box 91, preferably rectangular in shape, with an openable and closable door 92. The door 92 is sealed to the box 91 by screws. Multiple vibration damping elements 93 are provided inside the box 91, and they do not completely fill the internal space of the box 91. When the vibration damping device 9 is subjected to vibration, the vibration damping elements 93 can move and collide within the box 91 to dissipate vibration energy.

[0033] In some embodiments, the damper 93 can be a liquid, such as a buffered liquid or oil, and preferably a solid particulate matter, such as gravel, rubber particles and plastic particles.

[0034] In other embodiments, the damper 93 can be an assembly, such as... Figure 3 As shown, it includes a sealed shell 93a, preferably a spherical shell, within which movable particles 93b are disposed. The particles do not completely fill the sealed shell 93a. Here, the particles can be gravel, rubber particles, plastic particles, or a combination of the above. The vibration damping body 93 of the combined structure dissipates vibration energy through the movement and collision of the particles 93b and the sealed shell 93a, further improving the vibration damping effect.

[0035] Since the storage tank 4 is only fixedly connected to the lever 3, and considering the convenience of installation or maintenance of this device, a limiting bracket 10 fixedly connected to the mixer 1 is provided on one side of the storage tank 4. The limiting bracket 10 includes a limiting seat 10a, a limiting plate 10b that is clearance-fitted with the side wall of the storage tank 4 on the upper side of the limiting seat 10a, and a bearing plate 10c that is clearance-fitted with the lower part of the storage tank 4. The bearing plate 10c has a through hole, and the size of the through hole is smaller than the diameter of the cylinder of the storage tank 4. The conical part of the lower side of the storage tank 4 passes through the through hole and is clearance-fitted with it. When the storage tank 4 is disassembled or installed, the limiting plate 10b restricts the side contact of the storage tank 4 to prevent it from tipping over, and the bearing plate 10c restricts the vertical downward movement of the storage tank 4 through the through hole, so that the storage tank 4 is temporarily supported to facilitate the disassembly and installation of components such as the lever 3. In addition, it should be emphasized that the limiting bracket 10 and the storage tank 4 have sufficient clearance. When the device is operating normally, the storage tank 4 and the limiting bracket 10 do not have any contact, and the entire weight of the storage tank 4 is applied to the lever 3.

[0036] The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, obvious variations or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A self-weight metering mixer control device comprising a mixer (1), characterized in that: The stirring machine (1) is connected with a hinged seat (2), the hinged seat (2) is hinged with a lever (3) which can swing up and down in the vertical plane, the hinged point is located on the lever (3), one end of the lever (3) is connected with the storage tank (4), the other end is vertically applied to the load cell (6), the load cell (6) is electrically connected with the control processor (8), wherein the length of the force arm from the hinged point to the storage tank (4) is L1, the length of the force arm from the hinged point to the load cell (6) is L2, L1 is greater than L2, and N=L1 / L2, the gravity of the storage tank (4) is expanded N times by the lever (3) and applied to the load cell (6), the load cell (6) transmits the force signal to the control processor (8), the control processor (8) reduces the measurement value of the load cell (6) by N times to obtain the true weight of the storage tank (4); the end of the lever (3) on one side of the load cell (6) is provided with a vertically upward force transmission rod (5), the upper end surface of the force transmission rod (5) is a plane, and the plane is in contact with the detection plane of the load cell (6); the load cell (6) is fixed on the weighing support (7), and the weighing support (7) is connected with the stirring machine (1) through the damping device (9); the damping device (9) comprises a sealed box body (91), and a damping body (93) is arranged in the box body (91), when the damping device (9) is vibrated, the damping body (93) can move and collide in the box body (91) to consume vibration energy.

2. A self-weighted scale mixer control device as claimed in claim 1, wherein: When the two ends of the lever (3) bear the load in balance, the whole is in a horizontal state.

3. A self-weighted scale mixer control device as claimed in claim 2, wherein: The damping body (93) is a particulate matter.

4. A self-weighted scale mixer control device as claimed in claim 3, wherein: The particulate matter includes sand, rubber particles and plastic particles.

5. A self-weight scale mixer control device according to claim 2, wherein: The damping body (93) comprises a sealed shell (93a), and a movable particulate body (93b) is arranged in the sealed shell (93a).

6. A self-weighted scale mixer control device as claimed in claim 5, wherein: The sealed shell (93a) is a spherical shell.

7. A self-weight scale mixer control device according to claim 2, wherein: The hinged seat (2) is connected with the stirring machine (1) through the damping device (9).

8. A self-weight scale mixer control device according to claim 1, wherein: The stirring machine (1) is further provided with a limiting support (10), the limiting support (10) comprises a limiting seat (10a), a limiting plate (10b) which is in gap cooperation with the side wall of the storage tank (4) and a bearing plate (10c) which is in gap cooperation with the lower part of the storage tank (4) are arranged on the limiting seat (10a); when the storage tank (4) is disassembled or installed, the limiting plate (10b) limits the storage tank (4) from being poured, and the bearing plate (10c) supports the storage tank (4), so that the storage tank (4) is temporarily supported.

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