Buffer transmission system

Abstract

The invention relates to a buffer transmission system, and belongs to the technical field of power and free conveyors, the buffer transmission system comprises a power and free conveyor body, the power and free conveyor body comprises a conveying module, the conveying module is used for driving a plurality of trays to move through a chain, cushion blocks are arranged below the trays, and the cushion blocks are arranged on the contact surfaces of the trays and the chain; the power and free conveyor body further comprises a detection module and a control module, the detection module is used for detecting the sizes of cushion blocks of the trays and uploading the sizes to the control module, the detection module is electrically connected with the control module, and the detection module gives an alarm when the sizes of the cushion blocks are smaller than a threshold value.

Description

Technical Field

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

[0002] Buffer transmission, also known as an accumulation conveyor, is mainly characterized by having a certain accumulation capacity and being able to temporarily store materials in a certain part of the conveyor line without stopping the conveying. This kind of equipment is often used in production lines, warehousing, and logistics systems to improve efficiency and flexibility.

[0003] Generally, for an accumulation conveyor, such as an automotive APC accumulation conveyor disclosed in a Chinese patent application with the publication number CN107444848A, it includes a frame, a head wheel assembly, a tail wheel assembly, and a plurality of conveying trolleys located above the frame. On both sides of the frame, a plurality of fixing frames are fixedly installed, and on both sides of the bottom of each fixing frame, a first rectangular groove with openings on both sides is provided. On the inner walls of the two first rectangular grooves close to each other, a guiding column is welded, and sliding grooves are provided on both sides of the guiding column. A rectangular chamber is provided on the fixing frame between the two first rectangular grooves. On the inner wall of one side of the rectangular chamber, a fixed shaft is rotatably installed, and one end of the fixed shaft extends to the outside of the frame and is welded with a runner. The present invention is economical and practical. The two mounting seats on each fixing frame can be finely adjusted according to the actual distance between the two mounting holes, so that the bolt holes and the corresponding mounting holes are on the same vertical axis, thereby facilitating the fixed installation of the fixing frames on the frame; by making the two mounting seats on each fixing frame can be finely adjusted according to the actual distance between the two mounting holes, so that the bolt holes and the corresponding mounting holes are on the same vertical axis, thereby facilitating the fixed installation of the fixing frames on the frame.

[0004] However, for a buffer transmission system used in an automotive welding production line, when transporting smaller parts, trays are usually required for support. At this time, the chain of the transmission system contacts the tray and drives the tray forward through the frictional force generated by the mutual contact. However, during long-term use, the tray is accelerated when it is just placed on the chain and needs to decelerate when it reaches the working station. Inevitably, relative movement will occur between the tray and the chain during the acceleration and deceleration processes. During the relative movement process, the structure on the tray and the chain undergo relative friction. After long-term friction, the contact structure between the tray and the chain will be severely worn, affecting the use. At this time, it is necessary to detect the degree of wear. For this reason, a buffer transmission system with little influence on use due to tray wear and high reliability is required. 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 influence on use due to tray wear and high reliability.

[0006] The object of the present invention can be achieved by the following technical solutions: A buffer transfer system includes an accumulation conveyor body. The accumulation conveyor body includes a conveying module. The conveying module is used to drive a plurality of pallets to move through a chain. A cushion block is arranged below the pallet, and the cushion block is arranged on the contact surface between the pallet and the chain; The accumulation conveyor body further includes a detection module and a control module. The detection module is used to detect the sizes of the cushion blocks of a plurality of pallets and upload them to the control module. The detection module is electrically connected to the control module. When the size of the cushion block is less than the threshold value, the detection module...

[0007] As a preferred technical solution of the present invention, the detection module is used to detect the size c of the cushion blocks of a plurality of pallets and upload it to the control module. The control module is pre-input with a size threshold value c0. The control module judges whether the size c of the cushion block is less than the size threshold value c0, and issues an alarm when the judgment result is yes.

[0008] As a preferred technical solution of the present invention, the control module is used to calculate the change rate of the sizes of a plurality of sequentially generated cushion blocks. The control module is used to issue an alarm when the change rate exceeds the threshold value.

[0009] As a preferred technical solution of the present invention, the control module stores the average cushion block sizes cjn generated sequentially. The control module is pre-input with a change rate threshold value Δcjn0. The control module is used to calculate whether the change rate Δcjn of the sizes of a plurality of sequentially generated cushion blocks is greater than the change rate threshold value Δcjn0.

[0010] 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. The control module increases the value of the change rate threshold when the speed exceeds the threshold value.

[0011] As a preferred technical solution of the present invention, the detection module is further 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 reference value of the chain speed, and d is a pre-input correction coefficient.

[0012] The beneficial effects of the present invention are: (1) By enabling the detection module to detect the sizes of the cushion blocks of a plurality of pallets and upload them to the control module, and the detection module issues an alarm when the size of the cushion block is less than the threshold value, it avoids the situation that the contact structure between the pallet and the chain is severely worn under long-term friction, affecting the use; (2) By enabling the control module to control according to the change rate of a number of sequentially generated spacer sizes, and the control module is used to issue an alarm when the change rate exceeds a threshold, so that the control module can judge the wear rate of the spacer in advance when the wear rate is relatively fast, preventing the situation where an alarm is issued only after the spacer is worn, and further reducing the impact of spacer wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a block diagram of the control circuit of the present invention; Figure 3 is a schematic structural diagram of the tray placed on the chain during the operation process of the present invention.

[0015] DESCRIPTION OF MAIN ELEMENT SYMBOLS: In the figure: 1, tray; 2, spacer. DETAILED DESCRIPTION OF THE INVENTION

[0016] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0017] Please refer to Figures 1 to 3 , a buffer transfer system, including an accumulation conveyor body, the accumulation conveyor body includes a conveying module, the conveying module is used to drive a number of trays 1 to move through a chain, a spacer 2 is arranged below the tray 1, and the spacer 2 is arranged on the contact surface between the tray 1 and the chain; The accumulation conveyor body further includes a detection module and a control module, the detection module is used to detect the size of the spacer 2 of a number of trays 1 and upload it to the control module, the detection module is electrically connected to the control module, and the detection module issues an alarm when the size of the spacer 2 is less than a threshold.

[0018] 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 arrangement positions of the sprocket and the chain ensure that there are two parts of the chain parallel to the ground, and one of the parts is closer to the ground and parallel to the ground than the other part. The part of the chain parallel to the ground and closer to the ground is used as the travel of the tray 1. The chain is arranged along a number of processing stations. At this time, the chain drives the rest of the structure to pass through a number of processing stations in sequence; A spacer 2 is arranged at the bottom of each tray 1, the spacer 2 is in contact with the chain, and the chain rubs against the friction surface, applying a force along the forward direction of the chain to the spacer 2; Meanwhile, the accumulation conveyor further includes a number of gripping arms. The gripping arms are used to place the pallet 1 on the chain and turn up the pallet 1 when the pallet 1 travels to the end of the chain stroke. At this time, the pallet 1 stands obliquely upward at a certain angle with the chain, improving the utilization rate of the storage space; During use, different workpieces are placed on different pallets 1. The gripping arm places the pallet 1 on the chain. The bottom of the cushion block 2 contacts the chain. The chain rubs against the bottom of the cushion block 2 as the friction surface, applying a force along the forward direction of the chain to the cushion block 2. The pallet 1 advances along the forward direction of the chain to complete the transportation. When the workpiece on one of the pallets 1 moves to its corresponding processing station, the gripping arm removes the pallet 1, and the workpiece is processed. After processing, the gripping arm places the pallet 1 back on the chain; During transportation, the chain of the transmission system contacts the pallet 1 and drives the pallet 1 forward through the frictional force 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 decelerate when it reaches the station. During the acceleration and deceleration processes, relative movement with the chain will inevitably occur. During the relative movement process, the structure on the pallet 1 and the chain undergo relative friction. After long-term friction, the contact structure between the pallet 1 and the chain will be severely worn, affecting the use. At this time, it is necessary to detect the degree of wear and issue an alarm immediately before it affects the use. For this reason, the detection module is used to detect the size c of the cushion blocks 2 of several pallets 1 and upload it to the control module. The control module has a pre-input size threshold c0. The control module determines whether the size c of the cushion block 2 is less than the size threshold c0. The size threshold is calculated in advance by the operator based on historical production experience and wear safety redundancy; Specifically, the detection module at least includes a scanner. The scanner is aligned with the chain. The scanner detects the size of the cushion block 2 through visual recognition. When the pallet 1 passes through the detection module, the detection module detects the size of the cushion block 2 through the scanner and uploads it to the control module; Since the pallet 1 is placed above the chain, the surface of the cushion block 2 that rubs against the chain is the bottom surface, and the bottom surface is constantly worn. There is a tendency for the cushion block 2 to erode from the bottom up. Therefore, after long-term contact, the cushion block 2 will wear in the vertical direction. Therefore, the detection module is used to detect the size c of the cushion block 2 in the vertical direction; When the judgment result is yes, it means that there is a greater probability that the contact structure between the pallet 1 and the chain will be severely worn. At this time, the control module issues an alarm; By enabling the detection module to detect the sizes of the cushion blocks 2 of several pallets 1 and upload them to the control module, and the detection module issues an alarm when the size of the cushion block 2 is less than the threshold, it avoids the situation that the contact structure between the pallet 1 and the chain will be severely worn after long-term friction, affecting the use; During use, the wear rate of the spacer block 2 often represents the operating condition of the machine. When the wear rate of the spacer block 2 is too high, it means that the tray 1 is not properly placed, or the chain is deformed, resulting in an excessive wear rate. At this time, it is necessary to use the wear rate of the spacer block 2 to give an early warning for such situations. Therefore, the control module is used to control according to the change rates of the sizes of several sequentially generated spacer blocks 2, and the control module is used to issue an alarm when the change rate exceeds the threshold value; Specifically, at fixed time intervals, the control module takes the average of the sizes of several spacer blocks 2 within the just-ended fixed time interval as the average size of the spacer block 2. At this time, the average size cj of the spacer block 2 generated after each fixed time interval represents the average size of several spacer blocks 2 within this time interval, representing the wear degree of the spacer block 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 sequentially generated average sizes of the spacer block 2, denoted as cj1, cj2,..., cjn. The control module is pre-input with a change rate threshold value Δcjn0. The control module calculates whether the change rate Δcjn of the sizes of several sequentially generated spacer blocks 2 is greater than the change rate threshold value Δcjn0 according to the average sizes cjn of several sequentially generated spacer blocks 2. When the change rate is greater than the change rate threshold value, it means that the wear rate exceeds the expectation. At this time, the control module issues an alarm. In this embodiment, the control module is based on the latest 10 sequentially generated average sizes cjn of the spacer block 2, and the control module is based on the average sizes cjn of several sequentially generated spacer blocks 2; The calculation method of the change rate is as follows: among the several spacer block 2 size values participating in the calculation, calculate the difference between any two spacer block 2 size values uploaded successively in chronological order to obtain several differences, and then calculate the average value of the several differences. For example, for the latest 10 sequentially generated average sizes cjn of the spacer block 2, calculate the average size cj2 of the spacer block 2 generated second earliest minus the average size cj1 of the spacer block generated earliest, and the average size cj3 of the spacer block 2 generated third earliest minus the average size cj2 of the spacer block 2 generated second earliest, and so on, until nine differences are obtained. Then calculate the average value of the nine differences to obtain the change rate Δcjn; By making the control module be used to control according to the change rates of the sizes of several sequentially generated spacer blocks 2 and the control module be used to issue an alarm when the change rate exceeds the threshold value, the control module can judge the wear rate of the spacer block 2 in advance when the wear rate is relatively fast, preventing the situation of issuing an alarm only after the spacer block 2 is worn, and further reducing the impact of the wear of the spacer block 2.

[0019] At different speeds of the chain, the wear rate of the spacer block 2 is different. When the production plan requires the chain to run at a relatively high speed, the wear rate of the spacer block 2 is relatively large. At this time, there is a probability that the control module determines that the wear rate exceeds the threshold when the spacer block 2 wears naturally. When the chain speed is low, the rapid wear of the spacer block 2 is more likely 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 according to the running speed of the chain. For this purpose, the detection module is also used to obtain the average speed v of the chain 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 correction coefficient input in advance, which is calculated by the operator in advance according to experience and historical production data, and v0 is a reference value of the chain speed input in advance; When the chain speed v is relatively large, the value of Δcjn0×A1 is relatively large. When the control module adjusts the change rate threshold to Δcjn0×A1, it completes the operation of increasing the judgment threshold when the chain speed is relatively large and reducing the misjudgment probability; When the chain speed v is relatively small, the value of Δcjn0×A1 is relatively small. When the control module adjusts the change rate threshold to Δcjn0×A1, it completes the operation of reducing the judgment threshold when the chain speed is relatively small and completes the monitoring of the wear rate of the spacer block 2.

[0020] The working principle and usage process of the present invention: During use, different workpieces are placed on different pallets 1. The grasping arm places the pallet 1 on the chain. The bottom of the spacer block 2 is in contact with the chain. The chain rubs against the bottom of the spacer block 2 as the friction surface, applying a force along the forward direction of the chain to the spacer block 2. The pallet 1 moves forward along the forward direction of the chain to complete the transportation. When the workpiece on one of the pallets 1 moves to its corresponding processing station, the grasping arm removes the pallet 1, and the workpiece is processed. After processing, the grasping arm places the pallet 1 back on the chain.

[0021] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to it as equivalent embodiments within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A buffer transmission system, characterized in that: It includes an accumulation conveyor body, and the accumulation conveyor body includes a conveying module. The conveying module is used to drive a plurality of pallets to move through a chain. A cushion block is arranged below the pallet, and the cushion block is arranged on the contact surface between the pallet and the chain. The accumulation conveyor body further includes a detection module and a control module. The detection module is used to detect the sizes of the cushion blocks of a plurality of pallets and upload them to the control module. The detection module is electrically connected to the control module, and the detection module issues an alarm when the size of the cushion block is less than a threshold value.

2. The buffer transmission system according to claim 1, wherein: The detection module is used to detect the size c of the cushion blocks of a plurality of pallets and upload it to the control module. A size threshold value c0 is pre-entered into the control module. The control module judges whether the size c of the cushion block is less than the size threshold value c0, and issues an alarm when the judgment result is yes.

3. The buffer transmission system according to claim 2, characterized in that: The control module is further used to calculate the change rate of a plurality of successively generated cushion block sizes. The control module is used to issue an alarm when the change rate exceeds a threshold value.

4. A buffer transmission system according to claim 3, wherein: The control module stores a plurality of successively generated average cushion block sizes cjn. A change rate threshold value Δcjn0 is pre-entered into the control module. The control module is used to calculate whether the change rate Δcjn of a plurality of successively generated cushion block sizes is greater than the change rate threshold value Δcjn0.

5. A buffer transmission system according to claim 4, wherein: The detection module is further used to obtain the average chain speed and upload it to the control module. The control module increases the value of the change rate threshold when the speed exceeds a threshold value.

6. The buffer transmission system according to claim 5, wherein: The detection module is further 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-entered reference value of the chain speed, and d is a pre-entered correction coefficient.

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