Control method of cable bridge partition plate welding device

Abstract

The invention provides a control method of a cable bridge partition plate welding device, and relates to the technical field of cable bridge automatic spot welding, and the control method comprises the following steps: controlling a spot welding mechanism to move downwards until all spot welding heads press a second to-be-welded workpiece in an internal groove body of a first to-be-welded workpiece; plate information of the first to-be-welded workpiece and the second to-be-welded workpiece is obtained, a corresponding welding process is obtained according to the plate information, the plate information at least comprises the material type and the plate thickness at the projection position of each spot welding head, and the welding process at least comprises the welding duration and the welding current of each welding point; and the conductive assemblies are controlled one by one to conduct the corresponding spot welding heads through the welding technology, so that the first to-be-welded workpiece and the second to-be-welded workpiece are sequentially welded at the projection points of the spot welding heads in the vertical direction till all the spot welding heads complete spot welding operation. The spot welding heads are conducted one by one through the conductive assemblies, and automatic spot-by-spot welding of long-strip-shaped plates such as cable bridge partition plates is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of automatic spot welding of cable trays, and in particular to a control method for a cable tray partition welding device. Background Art

[0002] During the installation and use of cable trays, it is often necessary to set partitions inside the cable trays to separate, organize and fix different types of cables and improve the safety and reliability of cable laying. Traditional cable tray partition installation methods mainly use bolt connections, riveting and other methods. These installation methods inevitably have problems such as low installation efficiency, low connection strength, and easy loosening.

[0003] In the prior art, in order to circumvent the above-mentioned problems, spot welding is also used for connection. However, due to the long length of the cable tray partition, the workers need to squeeze the partition and the cable tray with a lot of pressure during spot welding, and then weld them one by one at the spot welding positions until all the spot welding positions in the length direction are completed. The workload is huge, and the welding effect of each welding position cannot be controlled. Summary of the invention

[0004] In view of the above defects or deficiencies in the prior art, the present invention aims to provide a control method for a cable tray partition welding device, which is implemented based on the cable tray partition welding device. The cable tray partition welding device comprises: a base, the base comprises a base and a fixed bracket connected to the base, a processing space is provided between the fixed bracket and the base, the base has a bearing surface located below the fixed bracket, a negative electrode plate is provided on the bearing surface along its length direction, and a plurality of conductive support blocks for placing a first workpiece to be welded and a second workpiece to be welded are provided on the negative electrode plate; A spot welding mechanism, wherein the spot welding mechanism comprises at least one welding gun group, wherein the welding gun group comprises a plurality of spot welding heads sequentially distributed along the length direction of the bearing surface, wherein the spot welding heads are arranged in the processing space, and each of the spot welding heads can move in a direction perpendicular to the bearing surface; at least one positive electrode plate, the positive electrode plate being fixedly mounted on the fixing bracket and located in the processing space; At least one group of conductive mechanisms, each group of the conductive mechanisms is matched with the welding gun group, each group of the conductive mechanisms includes a plurality of flexible conductive sheets corresponding to the spot welding heads, and a driving assembly corresponding to each of the flexible conductive sheets, the driving assembly is fixed in the processing space, one end of the flexible conductive sheet is connected to the corresponding moving end of the driving assembly, and the other end is electrically connected to the corresponding spot welding head through a conductive block; the flexible conductive sheet has a first state and a second state, in the first state, the flexible conductive sheet abuts against the positive electrode plate to achieve electrical connection between the two, and in the second state, the flexible conductive sheet is separated from the positive electrode plate; the driving assembly is used to drive the corresponding flexible conductive sheet to switch between the first state and the second state; A group of the conductive mechanisms has a corresponding transformer and the positive electrode plate, and the transformer provides power for the positive electrode plate and the negative electrode plate; when welding is started, each of the driving components drives the corresponding flexible conductive sheet of the conductive component one by one to be in the first state, so as to turn on the spot welding heads one by one to weld the first workpiece to be welded and the second workpiece to be welded in sequence at each projection point in the vertical direction of the spot welding head, and the control method comprises the following steps: Controlling the spot welding mechanism to move downward until all the spot welding heads press the second workpiece to be welded tightly into the inner groove of the first workpiece to be welded; Acquire plate information of the first workpiece to be welded and the second workpiece to be welded, wherein the first workpiece to be welded and the second workpiece to be welded have the same material; obtain a corresponding welding process according to the plate information, wherein the plate information at least includes material type and plate thickness at each projection of the spot welding head, and the plate thickness is the total thickness of the first workpiece to be welded and the second workpiece to be welded in the moving direction of the spot welding head; the welding process at least includes welding time and welding current of each welding point; The conductive components are controlled one by one to turn on the corresponding spot welding heads using the welding process, so as to weld the first workpiece to be welded and the second workpiece to be welded in sequence at each vertical projection point of the spot welding head until the spot welding heads complete the spot welding operation.

[0005] According to the technical solution provided by the present invention, obtaining the corresponding welding process according to the plate information specifically includes the following steps: If the thickness of the plate at the projection position of each spot welding head is the same, a welding process common to all the spot welding heads is obtained; If the thickness of the plate at the projection locations of at least two of the spot welding heads is different, the welding processes corresponding to the spot welding heads are obtained respectively.

[0006] According to the technical solution provided by the present invention, after obtaining the corresponding welding process according to the plate information, before controlling the plurality of spot welding heads to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process, the following steps are also included: Receiving a real-time grid voltage within a first preset time period; The controlling of the plurality of spot welding heads to sequentially perform spot welding operations along the length direction of the bearing surface under the corresponding welding process specifically comprises the following steps: When all the real-time grid voltages are in the first preset interval and the real-time grid voltage change rate within the first preset time period is less than or equal to the first preset threshold, the multiple spot welding heads are controlled to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process.

[0007] According to the technical solution provided by the present invention, after receiving the real-time grid voltage within the first preset time period, the following steps are also included: When at least one of the real-time grid voltages is not in the first preset interval or the real-time grid voltage change rate within the first preset time period is greater than the first preset threshold, a corrected welding process is obtained according to the real-time grid voltage, and the conductive components are controlled one by one to turn on the corresponding spot welding heads to perform spot welding operations in sequence using the corrected welding process.

[0008] According to the technical solution provided by the present invention, the plate information also includes stress distribution of the first workpiece to be welded and the second workpiece to be welded; the controlling of the plurality of spot welding heads to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process specifically includes the following steps: According to the stress distribution, obtaining the local stress of each of the spot welding heads at the first workpiece to be welded and the second workpiece to be welded; According to each of the local stresses, a welding sequence is obtained, wherein the welding sequence is used to characterize the power-on timing of each of the spot welding heads, wherein the greater the local stress, the later the power-on timing of the corresponding spot welding head; Control the plurality of spot welding heads to perform spot welding operations in sequence under the corresponding welding processes.

[0009] Compared with the prior art, the beneficial effect of the present invention is that: the present invention adopts a design in which multiple spot welding heads are distributed in sequence along the length direction of the bearing surface, and multiple welding points can be welded at the same time, which greatly improves the welding efficiency. Compared with the traditional single spot welding head welding method, a large amount of welding time is saved and the production efficiency is improved. At the same time, each spot welding head has a corresponding conductive mechanism, which can realize synchronous welding, and can also be turned on one by one for welding. In the process of turning on the spot welding heads one by one, multiple spot welding heads share a transformer for power supply, which can greatly reduce the material cost and has strong flexibility. The welding device can be adjusted and adapted according to cable trays and partitions of different specifications. By adjusting the parameters such as the spacing and moving range of the spot welding heads, the welding requirements of cable trays and partitions of different sizes can be met, and it has strong versatility and adaptability. At the same time, the present invention can determine the most suitable welding process, including welding time and welding current, according to different material types and plate thicknesses by obtaining the plate information of the first workpiece to be welded and the second workpiece to be welded. In this way, it can be ensured that each welding point can obtain the best welding effect and improve the stability of welding quality. The spot welding mechanism can press the second workpiece to be welded into the inner groove of the first workpiece to be welded, thereby ensuring the stable position of the workpieces during welding, reducing welding deformation, and further improving welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure inside the cable tray partition welding device provided by the present invention; Figure 2 A schematic diagram of the overall structure of the cable tray partition welding device provided by the present invention; Figure 3 A flow chart of the steps of a control method for a cable tray partition welding device provided by the present invention.

[0011] The text annotations in the figure represent: 1. Base; 2. Fixed bracket; 3. Downward pressure cylinder; 4. Negative electrode plate; 5. Spot welding head; 6. Conductive block; 7. Flexible conductive sheet; 8. Telescopic cylinder. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0013] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0014] Example 1 As mentioned in the background technology, in view of the problems in the prior art, the present invention proposes a cable tray partition welding device, please refer to Figure 1 , Figure 2 As shown, including: A base, the base comprising a base 1 and a fixing bracket 2 connected to the base 1, a processing space being provided between the fixing bracket 2 and the base 1, the base 1 having a bearing surface located below the fixing bracket 2, a negative electrode plate 4 being provided on the bearing surface along its length direction, and a plurality of conductive support blocks 9 for placing workpieces to be welded being provided on the negative electrode plate 4; At least one positive electrode plate 11, wherein the positive electrode plate 11 is fixedly mounted on the fixing bracket 2 and is located in the processing space; Specifically, the base 1 is made of a solid metal material and has sufficient stability and load-bearing capacity. The fixed bracket 2 is firmly connected to the base 1 by welding, bolting, etc. to ensure that no shaking or displacement occurs during the welding process. The fixed bracket 2 and the base 1 are covered with insulating covers on the outside to avoid the risk of electric shock to the staff. The height and shape of the fixed bracket 2 are designed according to actual needs to ensure that the size of the processing space is appropriate to facilitate the operation and movement of the spot welding head 5. On the bearing surface of the base 1, the negative electrode plate 4 is laid along its length. The negative electrode plate 4 can be made of metal materials with good electrical conductivity, such as copper, aluminum, etc. The negative electrode plate 4 is isolated from the base 1 by insulating material to prevent current leakage.

[0015] Specifically, the positive electrode plate 11 is connected to the positive electrode of the transformer. The negative electrode plate 4 should be connected to the negative electrode of the transformer. The workpieces to be welded are a cable tray and a partition, and the partition is placed in the inner slot of the cable tray, so that the cable tray and the partition are welded together along their length direction by the welding device.

[0016] A spot welding mechanism, wherein the spot welding mechanism comprises at least one welding gun group, wherein the welding gun group comprises a plurality of spot welding heads 5 sequentially distributed along the length direction of the bearing surface, wherein the spot welding heads 5 are arranged in the processing space, and each of the spot welding heads 5 can move in a direction perpendicular to the bearing surface; and a group of the welding gun groups has a corresponding transformer to provide power to the spot welding heads in the welding gun group; The plurality of spot welding heads 5 are sequentially distributed in the processing space along the length direction of the bearing surface. The number of the spot welding heads 5 can be adjusted according to the actual welding requirements. The spot welding heads 5 can also be moved in a direction perpendicular to the bearing surface through mechanisms such as guide rails and sliders. This movement can be achieved by motor drive, hydraulic drive or pneumatic drive to ensure that the spot welding heads 5 can accurately align with the welding points of the workpiece to be welded.

[0017] At least one group of conductive mechanisms, each group of the conductive mechanisms is matched with the welding gun group, each group of the conductive mechanisms includes a plurality of flexible conductive sheets 7 corresponding to the spot welding heads 5, and a driving assembly corresponding to each of the flexible conductive sheets 7, the driving assembly is fixed in the processing space, one end of the flexible conductive sheet 7 is connected to the corresponding moving end of the driving assembly, and the other end is electrically connected to the corresponding spot welding head 5 through the conductive block 6; the flexible conductive sheet 7 has a first state and a second state, in the first state, the flexible conductive sheet 7 is in contact with the positive electrode plate 11 to achieve electrical connection between the two, and in the second state, the flexible conductive sheet 7 is separated from the positive electrode plate 11; the driving assembly is used to drive the corresponding flexible conductive sheet 7 to switch between the first state and the second state; Specifically, the conductive block 6 can be made of a metal material with good conductive properties such as copper and aluminum. The conductive block 6 is fixed to the spot welding head 5 by welding, bolting, etc. to ensure that it will not loosen or move during the welding process. The positive electrode plate 11 can be made of the same material as the negative electrode plate 4, and its area and shape should be designed according to actual needs to ensure good contact and conductive properties with the conductive block 6.

[0018] A group of the conductive mechanisms has a corresponding transformer and a positive electrode plate 11, and the transformer provides power for the positive electrode plate 11 and the negative electrode plate 4; when welding is started, each of the driving components drives the flexible conductive sheet 7 of the corresponding conductive component one by one to be in the first state, so as to turn on the spot welding head 5 one by one to weld the workpiece to be welded in sequence at each vertical projection point of the spot welding head 5.

[0019] Furthermore, the number of the transformers is two: the number of the spot welding heads 5 proposed in this embodiment is six, therefore, every three spot welding heads 5 share one transformer, that is, one transformer provides power to three adjacent spot welding heads 5, which can realize time-sharing control, thereby achieving the technical effect of point-by-point welding. Because a transformer may cause power loss in the flexible conductive sheet 7 that reaches the edge. This is because as the distance from the transformer increases, the current may be affected by factors such as resistance and inductance on the transmission path, resulting in a voltage drop, which reduces the actual amount of power obtained by the flexible conductive sheet 7 at the edge.

[0020] The use of two transformers can circumvent this problem to a certain extent. When the six spot welding heads 5 are divided into two groups, and each three spot welding heads 5 share one transformer, the distance between each spot welding head 5 and the corresponding transformer is relatively shortened. This can reduce the loss of current in the transmission path, so that the flexible conductive sheet 7 connected to the spot welding head 5 near the edge can also obtain a relatively stable power supply.

[0021] Furthermore, the flexible conductive sheet 7 includes a plurality of flexible conductive strips, and both ends of all the flexible conductive strips along the extension direction are welded to form a rigid connection portion.

[0022] Furthermore, the driving component is a telescopic cylinder 8, the fixed end of the telescopic cylinder 8 is installed on the fixed bracket 2, and the movable end of the telescopic cylinder 8 is connected to the rigid connection part at one end of the flexible conductive strip.

[0023] Furthermore, the spot welding mechanism includes two groups of welding gun groups, each group of welding gun groups includes three spot welding heads 5, and each transformer provides power to the driving components corresponding to three adjacent spot welding heads 5; the negative pole of the transformer is connected to the negative electrode plate 4; and the positive pole of the transformer is connected to the positive electrode plate 11.

[0024] Furthermore, a downward pressing cylinder 3 is installed on the fixed bracket 2, the fixed end of the downward pressing cylinder 3 is fixed on the fixed bracket 2, and the movable end of the downward pressing cylinder 3 is connected to the conductive mechanism; the downward pressing cylinder 3 is used to control multiple spot welding heads 5 to move synchronously in a direction perpendicular to the bearing surface.

[0025] Specifically, the positive output terminal of the transformer is connected to the positive electrode plate 11 through a wire, and the negative terminal of the transformer is connected to the negative electrode plate 4 through a wire.

[0026] Specifically, the use process and working principle are described as follows: first, place the cable tray on the conductive support block 9, and then place the partition in the cable tray. When the telescopic cylinder 8 pushes the rigid connection part of one end of the flexible conductive sheet 7 away from the conductive block 6 and tightly abuts against the positive electrode plate 11, the power-on state is achieved. In the power-on state, the positive output end of the transformer passes through the positive electrode plate 11 and the flexible conductive sheet 7 to reach the conductive block 6, and then the conductive block 6 transmits the current to the spot welding head 5, so that the spot welding head 5 is powered. At the same time, since the spot welding head 5 is in contact with the cable tray and the partition, and the cable tray and the partition are electrically connected to the negative electrode plate 4 through the conductive support block 9, and the negative electrode plate 4 is connected to the negative pole of the transformer, a complete welding current loop is formed, and the partition can be welded in the cable tray. After welding is completed, the telescopic cylinder 8 retracts, so that the rigid connection part of the flexible conductive sheet 7 away from the conductive block 6 is separated from the positive electrode plate 11, the welding current loop is disconnected, and the spot welding head 5 is also powered off.

[0027] Specifically, the conductive block 6 is usually made of a material with good conductivity, such as copper, silver, etc., to ensure a low-resistance conductive path. The fixing method of the conductive block 6 needs to ensure that it will not loosen or shift during the welding process to ensure stable conductive performance.

[0028] Specifically, the material of the flexible conductive sheet 7 generally has good flexibility and conductivity, such as copper foil, conductive rubber, etc. This flexible design enables the conductive sheet to adapt to different positions and movement requirements of the spot welding head 5 .

[0029] Specifically, when the driving element pushes the end of the flexible conductive sheet 7 away from the negative electrode plate 4 to be in close contact with the conductive block 6, the power-on state is achieved. In the power-on state, the positive output end of the transformer transmits the current to the conductive block 6 through the positive electrode plate, and then forms a conductive path between the flexible conductive sheet 7 and the spot welding head 5, so that the spot welding head 5 is powered. At the same time, since the spot welding head 5 is in contact with the cable tray and the partition, and the cable tray and the partition are connected to the negative electrode plate 4, a complete welding current loop is formed. After welding is completed, the driving element (telescopic cylinder 8) retracts, so that the end of the flexible conductive sheet 7 away from the negative electrode plate 4 is separated from the conductive block 6, the above-mentioned conductive path is disconnected, and the spot welding head 5 is also powered off.

[0030] Example 2 On the basis of Example 1, this embodiment proposes a control method for a cable tray partition welding device, which is implemented based on the cable tray partition welding device as described in Example 1; please refer to Figure 3 As shown, the following steps are included: S1, controlling the spot welding mechanism to move downward until all the spot welding heads 5 press the second workpiece to be welded tightly into the inner groove of the first workpiece to be welded; Specifically, the cable tray is manually placed on the bearing surface, and the partition is placed in the inner slot of the cable tray.

[0031] Furthermore, the spot welding mechanism is controlled to move downward until all the spot welding heads 5 press the first workpiece to be welded, and the pressing refers to moving all the spot welding heads 5 downward so that all the spot welding heads 5 and the bearing surface clamp the cable tray together, so that the cable tray can be fixed. In this way, when the energized spot welding heads 5 perform spot welding at the corresponding positions, the other unenergized spot welding heads 5 can also play a pressing role, thereby ensuring the fitting effect of the cable tray and the partition, and ensuring better welding results.

[0032] S2, obtaining the plate information of the first workpiece to be welded and the second workpiece to be welded, wherein the first workpiece to be welded and the second workpiece to be welded are made of the same material; obtaining the corresponding welding process according to the plate information, wherein the plate information at least includes the material type and the plate thickness at the projection of each spot welding head 5, and the plate thickness is the total thickness of the first workpiece to be welded and the second workpiece to be welded in the moving direction of the spot welding head 5; the welding process at least includes the welding time and welding current of each welding point; Specifically, use equipment such as a thickness gauge, a material analyzer, etc. to obtain the plate information of the cable tray and the partition, including the material type and the plate thickness at the projection of each spot welding head 5 .

[0033] The acquired plate information is input into the database query system (pre-trained model). The system searches the database according to the material type and plate thickness to find the matching welding process parameters.

[0034] If there is a completely matching plate information in the database, the corresponding welding time and welding current can be directly obtained. If there is no complete match, the interpolation method or approximate matching method can be used to find the welding process parameters corresponding to the closest plate information from the database.

[0035] S3, controlling the conductive components one by one to turn on the corresponding spot welding heads 5 with the welding process, so as to weld the first workpiece to be welded and the second workpiece to be welded in sequence at each vertical projection point of the spot welding heads 5, until the spot welding operations are completed by the spot welding heads 5.

[0036] Specifically, this embodiment has six spot welding heads 5. The first spot welding head 5 enters the first state and is powered on under the action of the control module. After spot welding for a certain period of time, the control module controls its corresponding conductive component to switch to the second state and power off; then, the second spot welding head 5 enters the first state and is powered on under the action of the control module, and power is off after spot welding for a certain period of time; and so on, the third and subsequent spot welding heads 5 perform the same operation in sequence until all spot welding heads 5 complete the spot welding operation.

[0037] Specifically, the present embodiment has two transformers (at this time, there are also two positive electrode plates, and every three spot welding heads 5 share one transformer), so when performing spot welding operations in sequence, it is necessary to start the corresponding transformer first to provide power to the spot welding head 5. At this time, it can be understood as a first transformer and a second transformer. The first transformer provides power to the first spot welding head, the second spot welding head, and the third spot welding head, and the second transformer provides power to the fourth spot welding head, the fifth spot welding head, and the sixth spot welding head. Therefore, when it is necessary to energize the first spot welding head, the second spot welding head, and the third spot welding head, start the first transformer first, and when it is necessary to energize the fourth spot welding head, the fifth spot welding head, and the sixth spot welding head, start the second transformer first.

[0038] In a preferred embodiment, obtaining the corresponding welding process according to the plate information specifically includes the following steps: If the thickness of the plate at the projection of each of the spot welding heads 5 is the same, a welding process common to all the spot welding heads 5 is obtained; If the thickness of the cable tray partitions is uniform, it means that the produced cable tray partitions have good performance. In this way, only one set of welding processes can be obtained, and each of the spot welding heads 5 can use this welding process.

[0039] If the thickness of the plate at the projection locations of at least two of the spot welding heads 5 is different, the welding processes corresponding to the spot welding heads 5 are obtained respectively.

[0040] However, there is also a situation where the thickness of the cable tray partitions is uneven, that is, some places may be thick and some places may be thin. At this time, if the general welding process is still used, the thin places will be penetrated and the thick places will not be welded thoroughly. Therefore, if the thickness of the plate at the projection point of a certain spot welding head 5 is different from the thickness of the plate at the projection point of other spot welding heads 5, the corresponding welding process is searched according to the corresponding plate thickness, that is, each spot welding head 5 corresponds to one welding process.

[0041] This embodiment can not only enable smooth spot welding of cable tray partitions with the same thickness, but also ensure the same spot welding effect at locations with different thicknesses, thereby improving welding effect and stability.

[0042] In a preferred embodiment, after obtaining the corresponding welding process according to the plate information, before controlling the plurality of spot welding heads 5 to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process, the following steps are also included: Receiving a real-time grid voltage within a first preset time period; The controlling of the plurality of spot welding heads 5 to sequentially perform spot welding operations under the corresponding welding processes along the length direction of the bearing surface specifically includes the following steps: When all the real-time grid voltages are in the first preset interval and the real-time grid voltage change rate within the first preset time period is less than or equal to the first preset threshold, the multiple spot welding heads 5 are controlled to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process.

[0043] Specifically, the first preset duration is a time range setting for collecting and analyzing grid voltage data. Within this time range, the system will continue to receive real-time information on the grid voltage in order to determine the stability of the grid voltage. Exemplarily, the first preset duration is 5 seconds, and the voltage value is obtained once per second, and a total of 5 real-time grid voltage values ​​are obtained. The first preset interval is a voltage range setting, which is used to determine whether the grid voltage is in a stable interval suitable for spot welding operations. If the real-time grid voltage is within this interval, it means that the grid voltage is basically stable, which is conducive to ensuring the quality of spot welding. Exemplarily, the first preset interval is [220V - 230V]. The first preset threshold is a setting for measuring the degree of change in the grid voltage. If the rate of change of the grid voltage is less than or equal to this threshold within the first preset duration, it means that the grid voltage changes relatively smoothly and fluctuates less, which helps to ensure a stable supply of current during spot welding. Exemplarily, the first preset threshold is set to 5%. If within the first preset time (such as the 5 seconds assumed above), the real-time grid voltage changes from 220V to 221V, the calculated voltage change rate is (221-220) / 220×100%=0.45%. This change rate is less than 5%, which meets the voltage change rate requirement and spot welding can be performed.

[0044] Specifically, since the grid voltage is sometimes stable and sometimes unstable, when the grid voltage is unstable, it has a greater impact on the welding effect. Therefore, this embodiment further limits the time when the grid voltage is stable and within the normal range, the corresponding welding process queried above can be used for spot welding to ensure the stability of the welding quality.

[0045] Furthermore, after receiving the real-time grid voltage within the first preset time period, the method further includes the following steps: When at least one of the real-time grid voltages is not in the first preset interval or the real-time grid voltage change rate within the first preset time period is greater than the first preset threshold, a corrected welding process is obtained according to the real-time grid voltage, and the conductive components are controlled one by one to turn on the corresponding spot welding heads 5 to perform spot welding operations in sequence with the corrected welding process.

[0046] When the grid voltage is unstable or the real-time grid voltage is not within the normal range, it means that the grid voltage fluctuates greatly, which may have an adverse effect on the welding quality. For example, if the voltage is too high, the welding current may be too large, which may easily cause the plate to burn through or the quality of the welded joint to deteriorate; if the voltage is too low, the welding current may be insufficient and a firm welded joint cannot be formed. In this case, the welding process calculated based on the plate information needs to be corrected. The correction methods can include adjusting the welding current, extending or shortening the welding time, increasing preheating or post-heat treatment, etc. The specific correction method needs to be determined according to the actual voltage conditions and plate characteristics. In this way, the welding quality can be ensured under different grid voltage conditions.

[0047] The following is a method for extending or shortening the welding time for reference: The adjustment coefficient x is obtained according to the quotient of the real-time grid voltage and the standard grid voltage, wherein the standard grid voltage is the voltage corresponding to the welding current in the welding process calculated according to the plate information; If x is less than 1, the corrected welding time t1=1+(1-x)×t0; if x is greater than 1, the corrected welding time t1=1-(1-x)×t0, where t0 represents the welding time in the welding process previously calculated based on the plate information, and t1 is the corrected welding time.

[0048] In a preferred embodiment, the plate information also includes stress distribution of the first workpiece to be welded and the second workpiece to be welded; the controlling of the plurality of spot welding heads 5 to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process specifically includes the following steps: According to the stress distribution, local stress of each of the spot welding heads 5 at the first workpiece to be welded and the second workpiece to be welded is obtained; According to each of the local stresses, a welding sequence is obtained, and the welding sequence is used to characterize the power-on timing of each of the spot welding heads 5, wherein the greater the local stress, the later the power-on timing of the corresponding spot welding head 5; The plurality of spot welding heads 5 are controlled to perform spot welding operations in sequence under the corresponding welding processes.

[0049] Specifically, the spot welding heads 5 can be energized according to the order in which they are placed along the length of the bearing surface, and spot welding can be performed in sequence. However, considering the stress problem, if the first spot welding head 5 is located close to a weak part such as the edge of a cable tray or a partition, the heat generated by welding may cause large local thermal deformation. During subsequent spot welding, due to the existing thermal deformation, the welding position of the subsequent spot welding head 5 may be slightly offset, thereby affecting the welding accuracy. Different spot welding sequences will result in different distributions of stress on the cable tray and partition during welding. If the sequence is unreasonable, stress may be concentrated in certain specific areas, affecting the dimensional accuracy of the welding part.

[0050] Therefore, this embodiment performs three-dimensional modeling on the combined structure of the cable tray and the partition. Professional finite element analysis software can be used to input parameters such as material properties and geometric dimensions of the cable tray and the partition. Through finite element analysis, the stress distribution under various loads on the structure during and after welding is simulated. Considering factors such as thermal stress and mechanical stress, the area of ​​stress concentration in the structure and the path of stress transfer are determined. Then the local stress at the projection of each spot welding head 5 is obtained.

[0051] Based on the local stress at the projection of each spot welding head 5, the low stress area in the structure is preferentially selected as the first welding part. In this way, the stress concentration caused by heat input and local deformation during welding can be reduced, and the impact on the overall stability of the structure can be reduced. Optionally, welding can be started from the center of the cable tray or the area away from the key connection part, and gradually advance to the high stress area. In the advancement process, the principle of symmetrical welding can also be followed. If the structure is symmetrical, welding can be performed at symmetrical positions at the same time, or symmetrical parts can be welded in a symmetrical order. Symmetrical welding can make the structure more uniformly stressed during welding and reduce the occurrence of asymmetric deformation. Exemplarily, the six spot welding heads 5 of this embodiment can be used as the first spot welding head 5 to start welding and the second spot welding head 5 to start welding, and then spread outward in turn, so that the welding sequence along the length direction of the bearing surface is {6,4,2,1,3,5}, where the number indicates the number of spot welding starts.

[0052] In actual production, some cable tray partitions do not have horizontal wire binding racks, while some products do. For cable tray partitions with wire binding racks, after completing the welding of welding points 1-6, the entire cable tray is offset to the left by about 5 cm in the width direction, so that spot welding heads No. 2 5 and spot welding heads No. 5 can weld one side of the wire binding rack, and then the entire cable tray is offset to the right by about 10 cm in the width direction so that spot welding heads No. 2 5 and spot welding heads No. 5 can weld the other side of the wire binding rack.

[0053] The movement of the cable tray needs to be smooth as a whole, and can be pushed and moved as a whole by a bidirectional multi-cylinder.

[0054] This solution saves the lifting and lowering control energy consumption in the welding control process by pressing down the spot welding head 5 synchronously; spot welding is achieved one by one by controlling the transformer group, ensuring the welding effect of each remote welding point, taking into account the number of transformers and the spot welding effect, saving the equipment space of the device, making the equipment layout compact and light. The cable tray no longer needs to be processed again after welding (black spots will be caused when using carbon dioxide gas shielded welding, and galvanizing or painting is required again to improve the appearance of the product, resulting in additional processing and cost), which improves production efficiency and reduces production costs.

[0055] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A control method for a cable tray partition welding device, characterized in that: The cable tray partition welding device is implemented based on the cable tray partition welding device, comprising: a base, the base comprising a base (1) and a fixed bracket (2) connected to the base (1), a processing space being provided between the fixed bracket (2) and the base (1), the base (1) having a bearing surface located below the fixed bracket (2), the bearing surface being provided with a negative electrode plate (4) along its length direction, the negative electrode plate (4) being provided with a plurality of conductive support blocks (9) for placing a first workpiece to be welded and a second workpiece to be welded; A spot welding mechanism, the spot welding mechanism comprising at least one welding gun group, the welding gun group comprising a plurality of spot welding heads (5) distributed in sequence along the length direction of the bearing surface, the spot welding heads (5) being arranged in the processing space, and each of the spot welding heads (5) being movable in a direction perpendicular to the bearing surface; At least one positive electrode plate (11), the positive electrode plate (11) being fixedly mounted on the fixed bracket (2) and located in the processing space; At least one group of conductive mechanisms, each group of conductive mechanisms is matched with the welding gun group, each group of conductive mechanisms comprises a plurality of flexible conductive sheets (7) corresponding to the spot welding heads (5) respectively, and a drive assembly corresponding to each flexible conductive sheet (7), the drive assembly being fixed in the processing space, one end of the flexible conductive sheet (7) being connected to the corresponding moving end of the drive assembly, and the other end being electrically connected to the corresponding spot welding head (5) through a conductive block (6); the flexible conductive sheet (7) having a first state and a second state, in the first state, the flexible conductive sheet (7) abuts against the positive electrode plate (11) to achieve electrical connection between the two, and in the second state, the flexible conductive sheet (7) is separated from the positive electrode plate (11); the drive assembly is used to drive the corresponding flexible conductive sheet (7) to switch between the first state and the second state; A group of the conductive mechanisms has a corresponding transformer and a positive electrode plate (11), the transformer providing power for the positive electrode plate (11) and the negative electrode plate (4); when welding is started, each of the drive components drives the corresponding flexible conductive sheet (7) of the conductive mechanism one by one to be in the first state, so as to turn on the spot welding heads (5) one by one to weld the first workpiece to be welded and the second workpiece to be welded in sequence at each vertical projection point of the spot welding heads (5); the control method comprises the following steps: Controlling the spot welding mechanism to move downward until all the spot welding heads (5) press the second workpiece to be welded tightly into the inner groove of the first workpiece to be welded; Acquire plate information of the first workpiece to be welded and the second workpiece to be welded, wherein the first workpiece to be welded and the second workpiece to be welded are made of the same material; obtain a corresponding welding process according to the plate information, wherein the plate information at least includes the material type and the plate thickness at the projection of each spot welding head (5), and the plate thickness is the total thickness of the first workpiece to be welded and the second workpiece to be welded in the moving direction of the spot welding head (5); and the welding process at least includes the welding time and welding current of each welding point; The conductive components are controlled one by one to conduct the corresponding spot welding heads (5) using the welding process, so as to weld the first workpiece to be welded and the second workpiece to be welded in sequence at each vertical projection point of the spot welding head (5), until the spot welding heads (5) have completed the spot welding operation.

2. The control method of the cable tray partition welding device according to claim 1 is characterized in that: The step of obtaining the corresponding welding process according to the plate information specifically includes the following steps: If the thickness of the plate at the projection point of each of the spot welding heads (5) is the same, a welding process common to all the spot welding heads (5) is obtained; If the thickness of the plate at the projection locations of at least two of the spot welding heads (5) is different, the welding processes corresponding to the respective spot welding heads (5) are obtained respectively.

3. The control method of the cable tray partition welding device according to claim 1 is characterized in that: After obtaining the corresponding welding process according to the plate information, before controlling the plurality of spot welding heads (5) to sequentially perform spot welding operations under the corresponding welding process along the length direction of the bearing surface, the step further includes: Receiving a real-time grid voltage within a first preset time period; The controlling of the plurality of spot welding heads (5) to sequentially perform spot welding operations under the corresponding welding processes along the length direction of the bearing surface specifically comprises the following steps: When all the real-time grid voltages are within a first preset interval and the real-time grid voltage change rate within the first preset time period is less than or equal to a first preset threshold, the plurality of spot welding heads (5) are controlled to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process.

4. The control method of the cable tray partition welding device according to claim 3 is characterized in that: After receiving the real-time grid voltage within the first preset time period, the following steps are also included: When at least one of the real-time grid voltages is not within the first preset interval or the real-time grid voltage change rate within the first preset time period is greater than the first preset threshold, a corrected welding process is obtained based on the real-time grid voltage, and the conductive components are controlled one by one to conduct the corresponding spot welding heads (5) with the corrected welding process to perform spot welding operations in sequence.

5. The control method of the cable tray partition welding device according to claim 1 is characterized in that: The plate information also includes stress distribution of the first workpiece to be welded and the second workpiece to be welded; the controlling the plurality of spot welding heads (5) to perform spot welding operations in sequence along the length direction of the bearing surface under the corresponding welding process specifically includes the following steps: According to the stress distribution, local stress of each of the spot welding heads (5) at the first workpiece to be welded and the second workpiece to be welded is obtained; A welding sequence is obtained according to each of the local stresses, wherein the welding sequence is used to characterize the power-on timing of each of the spot welding heads (5), wherein the greater the local stress, the later the power-on timing of the corresponding spot welding head (5); The plurality of spot welding heads (5) are controlled to perform spot welding operations in sequence under the corresponding welding processes according to the welding sequence.

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