A buffer transmission system

Abstract

The present invention relates to a buffer transmission system, which belongs to the technical field of power-generating conveyors. The system comprises a power-generating conveyor body, wherein the power-generating conveyor body comprises a conveying module, wherein the conveying module is used to drive a plurality of pallets to move via a chain, wherein pads are provided under the pallets, and wherein the pads are provided on the contact surface between the pallets and the chain; the power-generating conveyor body further comprises a detection module and a control module, wherein the detection module is used to detect the sizes of the pads of the plurality of pallets and upload the detected sizes to the control module, wherein the detection module is electrically connected to the control module, and wherein the detection module issues an alarm when the pad size is less than a threshold value.

Description

Technical Field

[0001] The present invention belongs to the technical field of accumulation and release conveyors, and in particular relates to a buffer transmission system. Background Art

[0002] Buffer conveyors, also known as power-and-free conveyors, are characterized by their ability to accumulate material, temporarily storing it in a certain section of the conveyor line without stopping the conveyor. These devices are often used in production lines, warehousing, and logistics systems to improve efficiency and flexibility.

[0003] A general accumulation type conveyor, for example, an automobile APC accumulation type conveyor disclosed in Chinese patent application with publication number CN107444848A, includes a frame, a head wheel assembly, a tail wheel assembly and a plurality of conveying trolleys located above the frame, a plurality of fixed frames are fixedly installed on both sides of the frame, and a first rectangular groove with openings on both sides is opened on both sides of the bottom of each fixed frame, a guide column is welded on the inner wall of the side where the two first rectangular grooves are close to each other, and a slide groove is opened on both sides of the guide column, and a rectangular chamber opened on the fixed frame is provided between the two first rectangular grooves, a fixed shaft is rotatably installed on the inner wall of one side of the rectangular chamber, and one end of the fixed shaft extends to the outside of the frame and is welded to a rotating wheel. The present invention is economical and practical. The two mounting seats on each fixing bracket can be fine-adjusted according to the actual distance between the two mounting holes, so that the bolt hole and the corresponding mounting hole are on the same vertical axis, thereby facilitating the fixed installation of the fixing bracket on the rack. The two mounting seats on each fixing bracket can be fine-adjusted according to the actual distance between the two mounting holes, so that the bolt hole and the corresponding mounting hole are on the same vertical axis, thereby facilitating the fixed installation of the fixing bracket on the rack.

[0004] However, the buffer transmission system used in automobile welding production lines usually requires a pallet to support the transportation of smaller parts. At this time, the chain of the transmission system contacts the pallet and drives the pallet forward through the friction generated by mutual contact. However, during long-term use, the pallet is accelerated when it is just placed on the chain, and needs to be decelerated when it reaches the workstation. During the acceleration and deceleration process, it will inevitably move relative to the chain. During the relative movement, the structure on the pallet and the chain will rub against each other. Long-term friction will cause serious wear of the contact structure between the pallet and the chain, affecting use. At this time, the degree of wear needs to be detected. For this reason, a buffer transmission system with little impact of pallet wear on use and high reliability is needed. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a buffer transmission system, which has the characteristics of little impact on use due to tray wear and high reliability.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A buffer transmission system includes a power-and-free conveyor body, the power-and-free conveyor body includes a conveying module, the conveying module is used to drive a plurality of pallets to move via a chain, and pads are provided below the pallets, and the pads are provided at the contact surface between the pallets and the chain;

[0008] The accumulation conveyor body also includes a detection module and a control module. The detection module is used to detect the size of the pads of several pallets and upload it to the control module. The detection module is electrically connected to the control module. When the pad size is less than a threshold value, the detection module

[0009] As a preferred technical solution of the present invention, the detection module is used to detect the size c of the pads of several pallets and upload it to the control module. The control module is pre-input with a size threshold c0. The control module determines whether the size c of the pad is smaller than the size threshold c0, and issues an alarm when the judgment result is yes.

[0010] As a preferred technical solution of the present invention, the control module is used for generating a plurality of sequentially generated change rates of the pad block sizes, and the control module is used for issuing an alarm when the change rate exceeds a threshold value.

[0011] As a preferred technical solution of the present invention, the control module stores several average pad block sizes cjn generated in sequence, and the control module is pre-input with a change rate threshold Δcjn0. The control module is used to calculate whether the change rate Δcjn of several average pad block sizes generated in sequence is greater than the change rate threshold Δcjn0.

[0012] As a preferred technical solution of the present invention, the detection module is further used to obtain the average chain speed and upload it to the control module, and the control module increases the value of the change rate threshold when the speed exceeds the threshold.

[0013] As a preferred technical solution of the present invention, the detection module is also used to obtain the average chain speed v and upload it to the control module. The control module adjusts the change rate threshold to Δcjn0×A1, where A1=v / v0×d, v0 is a pre-input chain speed reference value, and d is a pre-input correction coefficient.

[0014] The beneficial effects of the present invention are:

[0015] (1) By having the detection module detect the size of the pads of several pallets and upload it to the control module, the detection module will issue an alarm when the pad size is less than the threshold, thus avoiding the situation where the contact structure between the pallet and the chain will be severely worn due to long-term friction, which will affect the use;

[0016] (2) By enabling the control module to generate a change rate of the pad size according to a number of sequentially generated values, and to issue an alarm when the change rate exceeds a threshold, the control module can determine the pad wear rate in advance when the wear rate is fast, thereby preventing the alarm from being issued after the pad is worn, thereby further reducing the impact of pad wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 This is a control loop block diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure in which a pallet is placed on a chain during the operation of the present invention.

[0021] Description of main component symbols:

[0022] In the figure: 1. Pallet; 2. Pad. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0024] See also Figures 1 to 3 A buffer transmission system includes a power-and-free conveyor body, the power-and-free conveyor body includes a conveying module, the conveying module is used to drive a plurality of pallets 1 to move through a chain, a pad 2 is provided under the pallet 1, and the pad 2 is provided on the contact surface between the pallet 1 and the chain;

[0025] The accumulation conveyor body also includes a detection module and a control module. The detection module is used to detect the size of the pads 2 of several pallets 1 and upload it to the control module. The detection module is electrically connected to the control module. The detection module issues an alarm when the size of the pad 2 is smaller than the threshold.

[0026] Specifically, the accumulation conveyor body includes at least one frame, a driving wheel arranged on the frame, a sprocket driven by the driving wheel and a chain wound around the sprocket. The sprocket and the chain are arranged in such a manner that two parts of the chain are parallel to the ground, and one part is closer to the ground and parallel to the ground than the other part. The part of the chain closer to the ground and parallel to the ground serves as the travel of the pallet 1. The chain is arranged along several processing stations, and at this time, the chain drives the remaining structures to pass through the several processing stations in sequence.

[0027] A pad 2 is provided at the bottom of each tray 1. The pad 2 contacts the chain, and the chain rubs against the friction surface, exerting a force on the pad 2 to move forward along the chain;

[0028] At the same time, the power-and-free conveyor also includes a number of grab arms, which are used to place the pallet 1 on the chain and flip the pallet 1 when the pallet 1 reaches the end of the chain travel. At this time, the pallet 1 is erected obliquely upward and forms a certain angle with the chain, thereby improving the utilization rate of the storage space.

[0029] When in use, different workpieces are placed on different pallets 1. The grabbing arm places the pallet 1 on the chain. The bottom of the pad 2 contacts the chain. The chain rubs against the bottom of the pad 2 as the friction surface, exerting a force on the pad 2 to move forward along the chain. The pallet 1 moves forward along the forward direction of the chain to complete the conveying. When the workpiece on one of the pallets 1 moves to its corresponding processing station, the grabbing arm removes the pallet 1 and the workpiece is processed. After the processing is completed, the grabbing arm places the pallet 1 back on the chain.

[0030] During transportation, the chain of the transmission system contacts the pallet 1 and drives the pallet 1 forward through the friction generated by the mutual contact. However, during long-term use, the pallet 1 is accelerated when it is just placed on the chain, and needs to be decelerated when it reaches the work station. During the acceleration and deceleration process, it is inevitable that it will have relative movement with the chain. During the relative movement, the structure on the pallet 1 and the chain will have relative friction. Under long-term friction, the contact structure between the pallet 1 and the chain will cause serious wear, affecting the use. At this time, it is necessary to detect the degree of wear and issue an alarm immediately before the use is affected. To this end, the detection module is used to detect the size c of the pad 2 of several pallets 1 and upload it to the control module. The control module is pre-input with a size threshold c0. The control module determines whether the size c of the pad 2 is less than the size threshold c0, where the size threshold is pre-calculated by the operator based on historical production experience and wear safety redundancy;

[0031] Specifically, the detection module includes at least a scanner, which is aligned with the chain and detects the size of the pad 2 through visual recognition. When the pallet 1 passes through the detection module, the detection module detects the size of the pad 2 through the scanner and uploads it to the control module;

[0032] Since the pallet 1 is placed above the chain, the surface where the pad 2 rubs against the chain is the bottom surface. The bottom surface is constantly worn, and the pad 2 tends to erode from the bottom upwards. Therefore, after long-term contact, the pad 2 will wear in the vertical direction. Therefore, the detection module is used to detect the vertical dimension c of the pad 2;

[0033] If the result of the judgment is yes, it means that there is a greater probability that the contact structure between the tray 1 and the chain will be severely worn, and the control module will issue an alarm;

[0034] By having the detection module detect the size of the pads 2 of several pallets 1 and upload it to the control module, the detection module will issue an alarm when the size of the pads 2 is smaller than the threshold, thus avoiding the situation where the contact structure between the pallet 1 and the chain will be seriously worn due to long-term friction, which will affect the use;

[0035] During use, the wear rate of the pad 2 often represents the operating status of the machine. When the wear rate of the pad 2 is too high, it means that the pallet 1 is not placed correctly, or the chain is deformed, resulting in excessive wear. In this case, it is necessary to use the wear rate of the pad 2 to issue an early warning for such situations. To this end, the control module is used to generate a plurality of sequentially generated change rates of the pad 2 size and issue an alarm when the change rate exceeds a threshold.

[0036] Specifically, at every fixed time period, the control module takes the average of the sizes of several pads 2 in the fixed time period just now as the average size of the pad 2. At this time, the average pad 2 size cj generated after each fixed time period represents the average size of several pads 2 in this time period, and represents the wear degree of the pad 2 at this time. Each time an average size is generated, it is uploaded to the control module. At this time, the control module stores several average pad 2 sizes generated in sequence, which are recorded as cj1, cj2, ..., cjn. The control module is pre-input with a change rate threshold Δcjn0. The control module calculates whether the change rate Δcjn of several sequentially generated pad 2 sizes is greater than the change rate threshold Δcjn0 based on the several sequentially generated average pad 2 sizes cjn. When the change rate is greater than the change rate threshold, it means that the wear speed exceeds expectations, and the control module issues an alarm. In this embodiment, the control module calculates the average pad 2 sizes cjn based on the latest 10 sequentially generated average pad 2 sizes;

[0037] The change rate is calculated as follows: among the multiple pad block 2 size values ​​involved in the calculation, the difference between any two pad block 2 size values ​​uploaded in chronological order is calculated to obtain multiple differences, and then the average value of the multiple differences is calculated. For example, for the latest 10 sequentially generated average pad block 2 sizes cjn, the average size cj2 of the second earliest generated pad block 2 is calculated minus the average size cj1 of the earliest generated pad block, the average size cj3 of the third earliest generated pad block 2 is minus the average size cj2 of the second earliest generated pad block, and so on, until nine differences are obtained. Then, the average value of the nine differences is calculated to obtain the change rate Δcjn.

[0038] By enabling the control module to issue an alarm when the rate of change of the pad block 2 size is exceeded according to several sequentially generated values, the control module can judge the wear rate of the pad block 2 in advance when the wear rate is fast, thereby preventing the alarm from being issued only after the pad block 2 is worn, thereby further reducing the impact of the wear of the pad block 2.

[0039] At different chain speeds, the wear rate of the pad 2 is different. When the production plan requires the chain to run at a higher speed, the wear rate of the pad 2 is higher. At this time, there is a probability that the control module will judge that the wear rate exceeds the threshold when the pad 2 is naturally worn. When the chain speed is low, the rapid wear of the pad 2 is more likely to be caused by factors that need to be monitored, such as the pallet 1 not being placed correctly or the chain being deformed. Therefore, the control module needs to adjust the threshold for judging the wear rate as the chain runs. To this end, the detection module is also used to obtain the average chain speed v and upload it to the control module. The control module adjusts the change rate threshold to Δcjn0×A1, where A1=v / v0×d, d is a pre-input correction coefficient, d is calculated in advance by the operator based on experience and historical production data, and v0 is a pre-input chain speed reference value;

[0040] When the chain speed v is large, the value of Δcjn0×A1 is large. When the control module adjusts the change rate threshold to Δcjn0×A1, the judgment threshold is increased when the chain speed is large, reducing the probability of misjudgment.

[0041] When the chain speed v is small, the value of Δcjn0×A1 is small. When the control module adjusts the change rate threshold to Δcjn0×A1, the judgment threshold is lowered when the chain speed is small, and the wear speed of the pad 2 is monitored.

[0042] The working principle and use process of the present invention:

[0043] During use, different workpieces are placed on different pallets 1. The grabbing arm places the pallet 1 on the chain, and the bottom of the pad 2 contacts the chain. The chain rubs against the bottom of the pad 2 serving as the friction surface, exerting a force on the pad 2 to move forward along the chain. The pallet 1 moves along the direction of the chain to complete the conveying. When the workpiece on one of the pallets 1 moves to its corresponding processing station, the grabbing arm removes the pallet 1 and the workpiece is processed. After the processing is completed, the grabbing arm places the pallet 1 back on the chain.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Buffer transmission system, characterized by: The power-and-free conveyor comprises a main body, wherein the main body comprises a conveying module, wherein the conveying module is used to drive a plurality of pallets to move through a chain, and a pad is provided under the pallet, and the pad is provided on the contact surface between the pallet and the chain; The power-and-free conveyor body further includes a detection module and a control module. The detection module is used to detect the size of the pads of several pallets and upload the information to the control module. The detection module is electrically connected to the control module. The detection module issues an alarm when the pad size is smaller than a threshold value. The accumulation conveyor body comprises at least one frame, a driving wheel arranged on the frame, a sprocket driven by the driving wheel, and a chain wound around the sprocket; The detection module is used to detect the size c of the pads of several pallets and upload it to the control module. The control module is pre-input with a size threshold c0. The control module determines whether the size c of the pad is less than the size threshold c0 and issues an alarm if the judgment result is yes. The control module is further configured to generate an alarm based on a plurality of sequentially generated change rates of the pad sizes when the change rate exceeds a threshold.

2. The buffer transmission system according to claim 1, wherein: The control module stores a plurality of sequentially generated average block sizes cjn, and is pre-input with a change rate threshold Δcjn0. The control module is used to calculate whether the change rate Δcjn of the plurality of sequentially generated block sizes is greater than the change rate threshold Δcjn0.

3. The buffer transmission system according to claim 2, wherein: The detection module is further configured to obtain an average chain speed and upload the speed to the control module. The control module increases a value of a change rate threshold when the speed exceeds a threshold.

4. The buffer transmission system according to claim 3, wherein: The detection module is also used to obtain the average chain speed v and upload it to the control module. The control module adjusts the change rate threshold to Δcjn0×A1, where A1=v / v0×d, where v0 is a pre-input chain speed reference value and d is a pre-input correction coefficient.

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