Dynamic checkweigher

Abstract

The utility model provides a dynamic checkweigher, which comprises a chassis and a conveyor, the conveyor is arranged above the chassis 1 and is connected through two groups of connecting assemblies, the two groups of connecting assemblies are symmetrically arranged front and back, and any one of the connecting assemblies comprises a pair of sensors which are symmetrically arranged on the chassis left and right; the pair of first outer spherical bearing seats are respectively fixed at the tops of the two sensors; the first optical shaft is connected between the two first outer spherical bearing seats in a penetrating manner; the connecting part is used for connecting the first optical shaft with the conveyor, so that the weight on the conveyor is transmitted to the first optical shaft; according to the invention, plane errors and distance errors of the sensor mounting plane caused by welding processing are eliminated, internal stress between the sensors is eliminated, the vibration influence is reduced, and the dynamic weighing precision of the dynamic checkweigher is improved.

Description

Technical Field

[0001] This utility model relates to a dynamic checkweigher, used for accurate weighing of materials during the conveying process. Background Technology

[0002] Belt conveyors, screw conveyors, and other conveying equipment are widely used in industries such as express delivery, food packaging, chemical batching, and mining. Weighing is an unavoidable requirement during material transport. A significant drawback of multi-sensor dynamic checkweighers on the market is their poor accuracy. Several factors affect the accuracy of dynamic checkweighers, with the following three being particularly influential:

[0003] 1. Stress between sensors: Taking four sensors as an example, whether it is a conveyor or a base frame, due to the influence of processing errors and welding deformation, the installation planes of the four sensors cannot be absolutely on the same plane. There is a certain distance and angle error. After installation, the stress between the sensors is too large, resulting in a decrease in accuracy. The welded base frame will inevitably deform over time, making this situation even more serious.

[0004] 2. Vibration effect: In theory, the conveyor of a dynamic checkweigher continuously transports materials, and the materials are weighed during the transport process. The vibration of the conveyor during operation adds stress, which aggravates the loss of weighing accuracy.

[0005] 3. The effect of the reaction force when the material initially arrives at the conveyor: When the material arrives at the conveyor, its motion state will change (it may accelerate or decelerate), and there will inevitably be a reaction force. This is also a major factor affecting the accuracy of the dynamic checkweigher.

[0006] Due to various factors, traditional dynamic checkweighers have poor accuracy, so the conveyor has to be stopped for weighing, which greatly reduces production efficiency and the weighing accuracy requirement is not high. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this utility model provides a dynamic checkweigher that avoids stress problems between sensors caused by processing and welding errors, reduces the impact of conveyor vibration on weighing accuracy, and improves the dynamic weighing accuracy of the dynamic checkweigher. The technical solution adopted by this utility model is as follows:

[0008] A dynamic checkweigher includes a base frame and a conveyor. The conveyor is disposed above the base frame and connected by two sets of connecting components. The two sets of connecting components are arranged symmetrically front to back. Each of the connecting components includes:

[0009] A pair of sensors are symmetrically arranged on the base frame;

[0010] A pair of first outer spherical bearing seats are respectively fixed on the top of the two sensors;

[0011] The first optical axis passes through and connects the two first outer spherical bearing seats;

[0012] The connecting part connects the first optical axis to the conveyor so that the weight on the conveyor is transferred to the first optical axis.

[0013] Furthermore, the connecting portion includes:

[0014] A pair of second outer spherical bearing seats are symmetrically arranged on the first optical axis;

[0015] A pair of shock absorbers are respectively disposed on the top of the two second outer spherical bearing seats, and the top of the shock absorbers is used to connect the conveyor.

[0016] Furthermore, the base frame is equipped with bullseye bearings that can contact the front or rear side of the shock absorber.

[0017] Furthermore, a channel steel is arranged extending upward from the bottom of the base frame, and the bullseye bearing is mounted on the side of the channel steel.

[0018] Furthermore, the connecting portion also includes:

[0019] The second optical axis passes through the two shock absorbers in a left-right direction;

[0020] A pair of third outer spherical bearing seats, with the second optical axis passing through and connecting the two third outer spherical bearing seats, and the third outer spherical bearing seats fixed to the bottom surface of the conveyor.

[0021] Advantages of this utility model:

[0022] By using the sensor, the first outer spherical bearing housing, and the first optical axis, and by utilizing the self-aligning function of the first outer spherical bearing housing in conjunction with the first optical axis, the installation position of the sensor is transferred to the first optical axis, thus solving the problem that the installation surfaces of the four sensors are not on the same plane.

[0023] By using the second outer spherical bearing housing, shock absorber and bullseye bearing, the reaction force generated by the change in material speed and the vibration of the conveyor are absorbed by the shock absorber, thus reducing the impact of reaction force and conveyor vibration on the balance.

[0024] By contacting the bullseye bearing with the shock absorber, the front end of the front shock absorber and the rear end of the rear shock absorber are both supported by the bullseye bearing, preventing the connecting part and the conveyor from swinging back and forth. The first optical shaft is only subjected to downward pressure and has no horizontal component force. As a result, the reaction force generated on the conveyor when the material speed changes is transmitted to the bullseye bearing through the shock absorber without affecting the weighing.

[0025] By using the second optical axis and the third outer spherical bearing housing, and by utilizing the self-aligning function of the third outer spherical bearing housing in conjunction with the second optical axis, the installation position of the conveyor is transferred to the second optical axis, thus solving the problem that the installation plane of the conveyor cannot achieve complete coplanarity due to low precision caused by bending and welding deformation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structural composition of this utility model.

[0027] Figure 2 This is a schematic diagram of the structural composition of the conveyor of this utility model.

[0028] Figure 3 for Figure 2 Top view.

[0029] In the diagram: 1-Base frame, 2-Conveyor, 3-Sensor, 4-First outer spherical bearing housing, 5-First optical axis, 6-Second outer spherical bearing housing, 7-Shock absorber, 8-Bullseye bearing, 9-Second optical axis, 10-Third outer spherical bearing housing. 1a-Channel steel. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 only used to explain this utility model and are not intended to limit this utility model.

[0031] Please see the appendix Figure 1 -Appendix Figure 3 This application proposes a dynamic checkweigher, including a base frame 1 and a conveyor 2. The conveyor 2 is disposed above the base frame 1 and connected by two sets of connecting components. The two sets of connecting components are arranged symmetrically front and rear. Each connecting component includes: a pair of sensors 3, symmetrically arranged left and right on the base frame 1; a pair of first outer spherical bearing seats 4, respectively fixed to the top of the two sensors 3; a first optical axis 5, which passes through and connects the two first outer spherical bearing seats 4; and a connecting part, which connects the first optical axis 5 to the conveyor 2 so that the weight on the conveyor 2 is transferred to the first optical axis 5.

[0032] Specifically, conveyor 2 is a belt conveyor, screw conveyor, or other common conveying type; the four sensors 3 are all pressure sensors, arranged in a rectangular shape near the four corners of the top of the base frame 1. Due to the high degree of freedom of the outer spherical bearing seats, unevenness of the mounting surface at the bottom of conveyor 2 or the mounting surface where the four sensors 3 are located can be solved by the self-aligning function of the outer spherical bearing seats. Therefore, the two left and right first outer spherical bearing seats 4 are connected by a first optical shaft 5, which transfers the installation position of the conveyor to the first optical shaft 5. Even if there are height errors, angle errors, and distance errors in the two left and right first outer spherical bearing seats 4, it does not matter. It can eliminate the problems of planar errors and distance errors caused by welding and processing of the mounting surfaces of the left and right sensors, eliminate the internal stress between the sensors, and improve the weighing accuracy. When the material is conveyed on the conveyor 2, its gravity is transmitted to the sensor 3 through the conveyor 2 and the first optical shaft 5. The weight of the material is calculated by the signal fed back to the control system by the sensor 3.

[0033] In this application, the connecting part includes: a pair of second outer spherical bearing seats 6, symmetrically arranged on the first optical axis 5; a pair of shock absorbers 7, respectively arranged on the top of the two second outer spherical bearing seats 6, the top of the shock absorbers 7 being used to connect the conveyor 2.

[0034] Specifically, the shock absorber 7 is a nylon block or made of other non-metallic materials with the same function; the connection between the second outer spherical bearing seat 6 and the shock absorber 7 forms a swing arm that can swing back and forth around the first optical axis 5. The lines connecting the four swing arms in the front, back, left and right sides with the lower base frame 1 and the upper conveyor form a parallelogram. The elastic deformation function of the shock absorber 7 reduces the impact of materials on the conveyor 2 and the vibration of the conveyor operation, while also eliminating the influence of the plane and distance errors of the front and rear sensor mounting surfaces.

[0035] Furthermore, the base frame 1 is equipped with a bullseye bearing 8 capable of contacting the front or rear side of the shock absorber 7. (See attached image) Figure 2 As shown, the conveyor 2 conveys in a back-to-back direction. The bullseye bearing 8 in the connecting part on the front side abuts against the front side of the shock absorber 7, and the bullseye bearing 8 in the connecting part on the rear side abuts against the rear side of the shock absorber 7. Therefore, the parallelogram formed between the four swing arms, the lower base frame 1, and the upper conveyor 2 is restricted by the two bullseye bearings 8 at the front and rear, preventing it from swinging back and forth. The swing arms only experience force in the direction of gravity and have no horizontal component force. Therefore, the reaction force (forward and backward) generated by the change in material speed is transmitted to the bullseye bearings 8 through the shock absorber 7 without affecting the weighing.

[0036] As one embodiment of this application, in order to facilitate the lateral installation of the bullseye bearing 8, a channel steel 1a is arranged extending upward from the bottom of the base frame 1, and the bullseye bearing 8 is installed on the side of the channel steel 1a.

[0037] In one specific embodiment, as shown in the appendix Figure 2 As shown, regarding the front connecting assembly, each sensor 3 has two channel steels 1a on its front side, facing away from each other and forming a groove in the middle. The height of the bullseye bearing 8 corresponds to that of the shock absorber 7. The bullseye bearing 8 is fixed to the channel steel 1a by bolt fasteners. The tightness of the bullseye bearing against the shock absorber can be adjusted. Regarding the rear connecting assembly, each sensor 3 has two channel steels 1a on its rear side, facing away from each other and forming a groove in the middle. The height of the bullseye bearing 8 corresponds to that of the shock absorber 7. The bullseye bearing 8 is fixed to the channel steel 1a by bolt fasteners. The tightness of the bullseye bearing against the shock absorber can be adjusted.

[0038] The bullseye bearing 8 is provided with a stable vertical movement trajectory by using two channel steels 1a and the channel. When there is a height difference between the front and rear shock absorbers 7, the height of the bullseye bearing 8 can be adjusted in time.

[0039] In addition, to further improve the coplanar installation effect between the conveyor 2 and the sensor 3, the connecting part also includes: a second optical axis 9, which passes through the two shock absorbers 7 in the left-right direction; a pair of third outer spherical bearing seats 10, wherein the second optical axis 9 passes through and connects between the two third outer spherical bearing seats 10, and the third outer spherical bearing seats 10 are fixed on the bottom surface of the conveyor 2.

[0040] It should be noted that the first outer spherical bearing housing 4, the second outer spherical bearing housing 6, and the third outer spherical bearing housing 10 in this application are bearings with self-aligning functions, such as fisheye bearings, spherical plain bearings, and self-aligning ball bearings. By using the self-aligning function of the two outer spherical bearing housings and passing through a second optical axis 9, the installation position of the conveyor 2 can be transferred to the second optical axis 9, solving the problem that the left and right installation planes cannot achieve complete coplanarity due to low bending accuracy and welding deformation.

[0041] In summary, this invention employs a combination of multiple self-aligning bearings, four bullseye bearings, four optical shafts, and four nylon shock absorbers. This eliminates planar and distance errors caused by welding processes on the sensor mounting plane, eliminates internal stress between sensors, eliminates the impact of reaction forces generated by material acceleration on the sensors, and reduces the impact of vibrations generated by conveyor operation on the sensors. It improves the dynamic weighing accuracy of the dynamic checkweigher without requiring significant investment in processing precision or extensive software debugging, offering low cost and ease of manufacturing.

[0042] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A dynamic checkweigher, comprising a base frame (1) and a conveyor (2), wherein the conveyor (2) is disposed above the base frame (1) and connected by two sets of connecting components, the two sets of connecting components being arranged symmetrically front and rear, characterized in that: Any of the connection components includes: A pair of sensors (3) are symmetrically arranged on the base frame (1); A pair of first outer spherical bearing seats (4) are respectively fixed on the top of the two sensors (3); The first optical axis (5) is connected through the two first outer spherical bearing seats (4); The connecting part connects the first optical axis (5) to the conveyor (2) so that the weight on the conveyor (2) is transferred to the first optical axis (5).

2. The dynamic checkweigher as described in claim 1, characterized in that, The connecting part includes: A pair of second outer spherical bearing seats (6) are symmetrically arranged on the first optical axis (5); A pair of shock absorbers (7) are respectively disposed on the top of the two second outer spherical bearing seats (6), and the top of the shock absorbers (7) is used to connect the conveyor (2).

3. The dynamic checkweigher as described in claim 2, characterized in that: The base frame (1) is provided with bullseye bearings (8) that can contact the front or rear side of the shock absorber (7).

4. The dynamic checkweigher as described in claim 3, characterized in that: The bottom of the base frame (1) extends upward with a channel steel (1a), and the bullseye bearing (8) is installed on the side of the channel steel (1a).

5. The dynamic checkweigher as described in any one of claims 2-4, characterized in that, The connecting part further includes: The second optical axis (9) passes through the two shock absorbers (7) in the left-right direction. A pair of third outer spherical bearing seats (10), the second optical axis (9) is connected through the two third outer spherical bearing seats (10), and the third outer spherical bearing seats (10) are fixed on the bottom surface of the conveyor (2).

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