Combined gantry correction system for forklift gantry welding and control method

Abstract

The invention discloses a combined type gantry correction system for forklift gantry welding and a control method. The method comprises the steps that three sets of correction mechanisms are sequentially arranged at a correction station of a conveying stand, and the three sets of correction devices are arranged in a straight line; the second group of correction mechanisms is fixedly mounted, and the first group of correction mechanisms and the third group of correction mechanisms are movably arranged on the two sides of the second group of correction mechanisms so as to perform servo movement in the length direction; detecting the overall length size of the portal frame, collecting the opening sizes of a plurality of point locations, and determining the point locations needing to be corrected according to the design standard size; and the point positions needing to be corrected are stopped to the second set of correction mechanism one by one for corresponding external supporting or internal pressing, the first set of correction mechanism and the third set of correction mechanism are correspondingly controlled to move to the corresponding positions at the same time to conduct internal supporting or external pressing on the door frame, and therefore deformation of the door frame is reduced. According to the invention, the automation level of correction of the forklift gantry can be improved, and the correction efficiency and convenience are improved.

Description

Technical Field

[0001] This invention relates to the technical field of forklift mast alignment, and more specifically, to a combined mast alignment system and control method for forklift mast welding. Background Technology

[0002] As a key component of forklifts, the mast's opening consistency directly determines the forklift's stability. Since the mast components are welded, welding deformation is unavoidable, necessitating a calibration station to correct the mast's opening dimensions. Currently, the company's calibration is done manually at a single point, applying internal pressure or external support to correct the mast's opening. During calibration, due to the stress, even after one point's opening dimension is corrected, subsequent corrections at adjacent points can affect the already corrected dimensions, requiring multiple re-calibrations per mast. This is not only inefficient but also shortens the mast's lifespan, hindering product quality improvement. Furthermore, calibration requires manual operation, preventing automation. Therefore, finding a quick and convenient way to calibrate the mast, reducing manual labor, is of great significance. Summary of the Invention

[0003] This invention provides a combined mast alignment control system and method for forklift mast welding, which solves the problems of low efficiency and inconvenience caused by the need for repeated alignment of forklift masts. It can improve the automation level of forklift mast alignment and increase alignment efficiency and convenience.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] 1. A combined mast alignment system for forklift mast welding, characterized in that it comprises: a PLC controller, a photoelectric sensor switch, a first set of alignment mechanisms, a second set of alignment mechanisms, and a third set of alignment mechanisms;

[0006] The second set of correction mechanisms is fixedly installed at a set position on the conveyor frame, and the first set of correction mechanisms and the third set of correction mechanisms are movably arranged on both sides of the second set of correction mechanisms;

[0007] The photoelectric sensor switch is installed at the front end of the calibration station to detect whether the gantry has reached the calibration station.

[0008] The PLC controller is connected to the photoelectric sensor switch, the first set of calibration mechanisms, the second set of calibration mechanisms, and the third set of calibration mechanisms respectively.

[0009] When the gantry reaches the calibration station, the PLC controller controls the three sets of calibration mechanisms to automatically extend and retract according to the received gantry opening size, so as to ensure that the gantry passes over the three sets of calibration mechanisms and stops the calibration point of the gantry at the second set of calibration mechanisms. Then, the PLC controller controls the second set of calibration mechanisms to perform internal pressure or external support calibration at the calibration point, and controls the first set of calibration mechanisms and the third set of calibration mechanisms to move to the corresponding positions to perform internal support or external pressure on the gantry, so as to reduce gantry deformation.

[0010] Preferably, it also includes: a sliding platform;

[0011] The sliding frame is slidably mounted on the conveyor frame, the first set of correction mechanisms is mounted on one of the sliding frames, and the third set of correction mechanisms is mounted on another sliding frame.

[0012] Preferably, the sliding frame includes: a drive wheel, a base, and a conveying roller;

[0013] The base has drive wheels at both ends of its bottom, which are slidably mounted on the guide rail of the conveyor frame. The top surface of the base has a conveyor roller, which is at the same height as the conveyor roller on the conveyor frame. The base is also used to set the first set of correction mechanisms or the third set of correction mechanisms.

[0014] The drive wheel is connected to the servo motor, and the servo motor is used to drive the drive wheel to move along the guide rail.

[0015] Preferably, the first set of calibration mechanisms, the second set of calibration mechanisms, and the third set of calibration mechanisms each include: a hydraulic cylinder, a calibration head, a base, and a mounting base;

[0016] The mounting base is provided at both ends of the base, the hydraulic cylinder is provided on the outer side of the mounting base, the alignment head is provided on the inner side of the mounting base, and the alignment head is connected to the output end of the hydraulic cylinder.

[0017] The base is provided with a sliding groove, and the correction head is slidably mounted on the sliding groove. The hydraulic cylinder drives the correction head to extend and retract along the sliding groove to provide internal support or external pressure to the correction point of the gantry.

[0018] The present invention also provides a combined mast correction control method for forklift mast welding, using the above-mentioned correction system, comprising:

[0019] Three sets of calibration mechanisms are set up sequentially at the calibration station of the conveyor frame, and the three sets of calibration equipment are arranged in a line.

[0020] The second set of calibration mechanisms is fixedly installed, while the first and third sets of calibration mechanisms are movably arranged on both sides of the second set of calibration mechanisms to perform servo movement along the length direction.

[0021] The entire length of the gantry was inspected, and the opening dimensions at multiple points were collected. The points that needed to be corrected were determined based on the design standard dimensions.

[0022] The points that need to be corrected are stopped one by one by the second set of correction mechanisms for corresponding external support or internal pressure, and the first and third sets of correction mechanisms are simultaneously moved to the corresponding positions to provide internal support or external pressure to the gantry in order to reduce gantry deformation.

[0023] Preferred options also include:

[0024] After all the points that need to be calibrated have been calibrated, the gantry is controlled to return to the forward conveying position of the gantry calibration mechanism. During the gantry return process, the third calibration mechanism automatically collects the gantry opening dimensions corresponding to the calibrated points.

[0025] The dimensions of multiple points after correction are judged. If the gantry is deemed to be qualified, it is released again through the correction mechanism. If it is deemed to be unqualified, the unqualified points are corrected again.

[0026] Preferred options also include:

[0027] When the gantry is being calibrated, the calibrating head of the calibrating mechanism is extended or retracted by the hydraulic servo system of the calibrating mechanism according to the opening size of the gantry, the length of the channel steel and the width of the wing plate, so as to accommodate the passage of the gantry.

[0028] When the gantry is detected by a photoelectric sensor switch at the calibration station, the full length dimension of the gantry is checked based on the length of the gantry channel steel and the rotation speed of the rollers on the conveyor platform.

[0029] After the gantry's full length dimensions are checked, the gantry is controlled to return to the forward conveying position of the gantry alignment mechanism so that the gantry can re-enter the alignment station for gantry alignment.

[0030] Preferred options also include:

[0031] When the second set of correction mechanisms performs internal pressure correction on the corresponding points of the gantry, the first set of correction mechanisms and / or the third set of correction mechanisms are controlled to move to the external support position of the gantry opening to externally support the gantry opening, in order to resist the influence of the second set of internal pressure on the gantry size.

[0032] When the second set of correction mechanisms performs external support correction on the corresponding points of the gantry, the first set of correction mechanisms and / or the third set of correction mechanisms are controlled to move to the internal pressure position of the gantry opening to internally press the gantry opening, in order to resist the influence of the second set of external support correction on the dimensions.

[0033] Preferably, determining the points requiring correction based on design standard dimensions includes:

[0034] A laser rangefinder sensor is installed to detect the correction dimensions of the gantry and the correction dimensions are fed back to the display screen in real time for display of the correction data.

[0035] Photoelectric switches are set up to detect the opening width corresponding to each point on the gantry. The detected opening width is compared with the design standard width. If the error exceeds the set threshold, the point is determined to be the point that needs to be corrected.

[0036] Preferred options also include:

[0037] After calibration, the gantry is transported back to the photoelectric switch in front of the calibration mechanism via the rollers of the conveyor platform. The photoelectric switch checks whether the calibrated dimensions meet the standard. If they do not meet the standard requirements, the gantry is returned for recalibration. If the calibration meets the standard, the gantry is transported forward to calibrate one point.

[0038] This invention provides a combined mast alignment system and control method for forklift mast welding. It employs three alignment mechanisms arranged in a line, with the second mechanism fixed in place. The first and third mechanisms are servo-movable along the mast's length. For masts of different lengths, the first and third mechanisms automatically move to the appropriate positions to achieve the three-stage alignment of the mast. This solves the problem of inefficiency and inconvenience caused by the need for multiple, repeated alignments in forklift mast welding, improving the automation level of forklift mast alignment and increasing its efficiency and convenience. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below.

[0040] Figure 1 This is a schematic diagram of a combined mast correction system for a forklift mast welding line, provided by an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of the first or third set of calibration mechanisms provided in the embodiments of the present invention.

[0042] Figure 3 This is a schematic diagram of the second set of correction mechanisms provided in an embodiment of the present invention.

[0043] Figure 4 This is a schematic diagram of a combined mast correction control method for welding forklift masts provided by the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and implementation methods.

[0045] To address the problem that current forklift mast alignment requires multiple and repeated adjustments, resulting in low efficiency and inconvenience, this invention provides a combined mast alignment system and control method for forklift mast welding. This system solves the problem of low efficiency and inconvenience caused by the need for multiple and repeated adjustments in forklift mast alignment, improves the automation level of forklift mast alignment, and increases alignment efficiency and convenience.

[0046] like Figures 1-3 As shown, a combined mast alignment system for a forklift mast welding line includes: a PLC controller (not shown), a photoelectric sensor switch (not shown), a first alignment mechanism 1, a second alignment mechanism 2, and a third alignment mechanism 3. The second alignment mechanism 2 is fixedly installed at a set position on the conveyor platform. The first alignment mechanism 1 and the third alignment mechanism 3 are movably arranged on both sides of the second alignment mechanism 2. The photoelectric sensor switch is located at the front end of the alignment station to detect whether the mast has reached the alignment station. The PLC controller is signal-connected to the photoelectric sensor switch, the first alignment mechanism, the second alignment mechanism, and the third alignment mechanism. When the gantry reaches the calibration station, the PLC controller controls the three sets of calibration mechanisms to automatically extend and retract according to the received gantry opening size, so as to ensure that the gantry 4 passes over the three sets of calibration mechanisms and stops the calibration point of the gantry 4 at the second set of calibration mechanisms. Then, the PLC controller controls the second set of calibration mechanisms to perform internal pressure or external support calibration on the calibration point, and controls the first set of calibration mechanisms and the third set of calibration mechanisms to move to the corresponding positions to perform internal support or external pressure on the gantry 4, so as to reduce gantry deformation.

[0047] Specifically, a combined calibration method is adopted, consisting of three sets of calibration mechanisms arranged in a line. The second set is fixed, while the first and third sets can be servo-moved along the length. For gantry of different lengths, the first and third sets can automatically move to the corresponding positions to achieve three-stage calibration of the gantry. When the second set needs to calibrate the internal pressure, the first and / or third calibration mechanisms move to the external support position of the gantry opening to externally support the gantry opening, thus resisting the influence of the second set's internal pressure on the gantry dimensions. When the second set requires external support, the first and / or third calibration mechanisms move to the internal pressure position of the gantry opening to internally press down the gantry opening, thus resisting the influence of the second set's external support on the dimensions. When the gantry automatically moves to the front end of the calibration equipment via the conveyor line, the scanning device on the conveyor line directly transmits the gantry opening dimensions, channel steel length L, and channel steel wing plate width information to the PLC controller by scanning the gantry's QR code. A photoelectric sensor switch is installed at the front end of the calibration station corresponding to the mast calibration mechanism. When the mast is detected, the PLC controller controls the three sets of calibration mechanisms to automatically extend and retract, allowing the calibration mechanisms to adapt to the opening size of the mast and ensuring that the mast can pass through the three sets of calibration mechanisms. This system can improve the automation level of forklift mast calibration, and increase calibration efficiency and convenience.

[0048] The system also includes: a sliding frame; the sliding frame is slidably mounted on the conveyor frame, the first set of correction mechanisms is mounted on one of the sliding frames, and the third set of correction mechanisms is mounted on another sliding frame.

[0049] The system also includes: a servo motor (not shown in the figure); the servo motor is driven and connected to the sliding frame and signal-connected to the PLC controller; the PLC controller controls the servo motor to drive the sliding frame to move according to the length of the gantry, so that the first set of correction mechanisms and the second set of correction mechanisms move to the corresponding positions.

[0050] Furthermore, the sliding platform includes: a drive wheel (not shown in the figure), a base 9, and a conveying roller 8; the bottom of both ends of the base is provided with drive wheels, which are slidably mounted on the guide rail of the conveying platform; the top surface of the base 9 is provided with the conveying roller 8, which is at the same height as the conveying roller on the conveying platform; the base is also used to set the first set of correction mechanisms or the third set of correction mechanisms; the drive wheel is driven by the servo motor, which is used to drive the drive wheel to move along the guide rail.

[0051] Furthermore, the first, second, and third sets of correction mechanisms each include: a hydraulic cylinder 5, a correction head 6, a base (not shown in the figure), and a mounting base 7. The mounting base 7 is correspondingly disposed at both ends of the base. The hydraulic cylinder 5 is located on the outer side of the mounting base 7, and the correction head 6 is located on the inner side of the mounting base 7. The correction head 6 is connected to the output end of the hydraulic cylinder 5. The base has a sliding groove, and the correction head is slidably disposed on the sliding groove. The hydraulic cylinder drives the correction head to extend and retract along the sliding groove to provide internal support or external pressure to the correction point of the gantry.

[0052] In practical applications, the calibration head and the cylinder body adopt an easily replaceable structure, which facilitates replacement after wear.

[0053] The system also includes: a laser rangefinder (not shown in the figure); the laser rangefinder is mounted on the base and is used to detect the gantry size; the PLC controller is connected to the laser rangefinder to obtain the detected gantry size in real time.

[0054] In practical applications, each calibration mechanism is equipped with a pair of Keyence high-precision laser rangefinders. The laser rangefinder brackets are mounted on the base plate of the calibration mechanism to reduce measurement errors caused by the movement of the hydraulic cylinder. Once the workpiece enters the predetermined position, the laser rangefinder begins measurement, enabling real-time reading of the gantry dimensions and replacing manual measurement.

[0055] The system also includes: a touch screen (not shown in the figure); the PLC controller is connected to the touch screen via a signal, and the touch screen is equipped with a human-machine interface and displays the detected gantry dimensions in real time.

[0056] In practical applications, the correction dimensions detected by the laser rangefinder are fed back to the touch screen in real time to prompt for correction, and the corrected dimensions are displayed on the touch screen in real time.

[0057] The system also includes a proportional directional valve (not shown in the figure); the proportional directional valve is installed in the hydraulic line between the servo hydraulic system and the hydraulic cylinder, the PLC controller is connected to the proportional directional valve by signal, and adjusts the hydraulic oil flow and direction of the hydraulic cylinder by controlling the opening and direction of the proportional directional valve, so as to drive the extension and retraction of the correction head.

[0058] The system also includes: a position sensor (not shown in the figure); the position sensor is mounted on the base and is used to detect the piston rod stroke position of the hydraulic cylinder in real time; the position sensor is signal-connected to the PLC controller, and the PLC controller controls the extension and retraction of the correction head according to the piston rod stroke position.

[0059] Furthermore, the second set of correction mechanisms also includes: a fixed frame 10; the fixed frame 10 is a frame structure, and the fixed frame is fixedly connected to the conveyor frame.

[0060] As can be seen, this invention provides a combined mast alignment system for forklift mast welding lines. It employs three sets of alignment mechanisms arranged in a single line, with the second set being fixed. The first and third sets can be servo-moved along the length. For masts of different lengths, the first and third sets can automatically move to the corresponding positions to achieve three-stage mast alignment. This solves the problem of low efficiency and inconvenience caused by the need for multiple, repeated alignments in forklift mast alignment, improving the automation level of forklift mast alignment and increasing alignment efficiency and convenience.

[0061] Accordingly, such as Figure 4 As shown, the present invention also provides a combined mast correction control method for forklift mast welding, using the above-mentioned correction system, comprising:

[0062] S1: Three sets of calibration mechanisms are set up in sequence at the calibration station of the conveyor frame, and the three sets of calibration equipment are arranged in a line.

[0063] S2: The second set of correction mechanisms is fixedly installed, while the first set of correction mechanisms and the third set of correction mechanisms are movably arranged on both sides of the second set of correction mechanisms to perform servo movement along the length direction.

[0064] S3: Inspect the entire length of the gantry and collect the opening dimensions at multiple points. Determine the points that need to be corrected based on the design standard dimensions.

[0065] S4: Stop each point that needs to be corrected at the second set of correction mechanisms for corresponding external support or internal pressure, and control the first and third sets of correction mechanisms to move to the corresponding positions to provide internal support or external pressure to the gantry in order to reduce gantry deformation.

[0066] Specifically, such as Figure 1As shown, a combined correction method is adopted using three sets of correction mechanisms arranged in a straight line. The second set of correction mechanisms 2 is fixedly installed, while the first set of correction mechanisms 1 and the third set of correction mechanisms 3 can be servo-moved along the length direction. For gantry 4 of different lengths, the first and third sets of correction mechanisms can automatically move to the corresponding positions to achieve three-way correction of the gantry. By detecting the full length dimension of the gantry, the opening dimensions of multiple points are collected and compared with the design standard dimensions to determine the points that need correction. During correction, the points that need correction are corrected one by one. If the first point needs correction, the correction system will control the first point of the gantry to stop at the second set of correction mechanisms, and apply internal pressure or external support to it according to the actual size of the first point. At the same time, the first set of correction mechanisms applies corresponding external support or internal pressure to the gantry when correcting the first point. If the 2nd to 11th points need correction, the required correction points will automatically stop at the second set of correction positions for correction, and the first and third sets of correction mechanisms will simultaneously apply internal support or external pressure to the relevant positions to reduce deformation. This method can solve the problem of low efficiency and inconvenience caused by the need for repeated calibration of forklift masts. It can improve the automation level of forklift mast calibration and increase calibration efficiency and convenience.

[0067] The method further includes: after all the points requiring correction have been corrected, controlling the gantry to retract to the forward conveying position of the gantry correction mechanism. During the gantry retraction process, the third correction mechanism automatically collects the gantry opening dimensions corresponding to the corrected points. The corrected dimensions of the multiple points are then judged. Gantry that passes the judgment is re-released through the correction mechanism, while those that fail are corrected again at the non-compliant points.

[0068] The method also includes: when the gantry passage correction mechanism is in operation, the correction head of the correction mechanism is controlled to extend and retract according to the opening size of the gantry, the length of the channel steel and the width of the wing plate through the hydraulic servo system of the correction mechanism to accommodate the passage of the gantry.

[0069] In practical applications, when the gantry automatically moves to the front end of the calibration equipment via the conveyor line, the scanning device on the conveyor line will directly transmit the gantry's opening size, channel steel length L, and channel steel wing plate width information to the calibration system by scanning the gantry's QR code. The calibration system automatically controls the hydraulic cylinders of the three calibration mechanisms to extend and retract the calibration head according to the received gantry opening size, so that the calibration mechanism can adapt to the gantry's opening size and ensure that the gantry can pass through the three calibration mechanisms.

[0070] The method also includes: setting up a photoelectric sensor switch in front of the calibration station, and when the gantry is sensed, detecting the full length dimension of the gantry based on the length of the gantry channel steel and the rotation speed of the rollers on the conveyor platform.

[0071] Specifically, when the photoelectric sensor detects the gantry, the timing begins. Based on the length of the gantry channel steel and the speed of the roller conveyor, the laser of the first set of calibration mechanisms will detect the full length of the gantry. Taking a standard 2m long channel steel as an example, the opening dimensions of 12 points will be collected. The calibration system will compare the opening dimensions detected at each point with the set standard dimensions to determine which points need to be calibrated.

[0072] The method also includes: after completing the full-length dimension detection of the gantry, controlling the gantry to return to the forward conveying position of the gantry correction mechanism so that the gantry can re-enter the correction station for gantry correction.

[0073] The method further includes: when the second set of correction mechanisms performs internal pressure correction on the corresponding points of the gantry, controlling the first set of correction mechanisms and / or the third set of correction mechanisms to move to the external support position of the gantry opening to externally support the gantry opening, so as to resist the influence of the second set of internal pressure on the gantry size.

[0074] The method further includes: when the second set of correction mechanisms performs external support correction on the corresponding points of the gantry, controlling the first set of correction mechanisms and / or the third set of correction mechanisms to move to the internal pressure position of the gantry opening to internally press the gantry opening, so as to resist the influence of the second set of external support correction on the dimensions.

[0075] In practical applications, when the first set of calibration mechanisms needs to adjust the internal pressure, the hydraulic cylinders of the second set of calibration mechanisms drive the calibration head to move to the outer support position of the gantry opening to externally support the gantry opening, thus resisting the influence of the first set of internal pressure on the positional dimensions of the second set. When the first set of calibration requires external support, the hydraulic cylinders of the second set of calibration mechanisms drive the calibration head to move to the inner pressure position of the gantry opening to internally press down on the gantry opening, thus resisting the influence of the first set of calibration's external support on the positional dimensions of the second set. When the second set of calibration requires internal pressure adjustment, the hydraulic cylinders of the first and third sets of calibration mechanisms drive the calibration heads to move to the outer support position of the gantry opening to externally support the gantry opening, thus resisting the influence of the second set of internal pressure on the positional dimensions of the first and third sets. When the second set of calibration requires external support, the hydraulic cylinders of the first and third sets of calibration mechanisms drive the calibration head to move to the inner pressure position of the gantry opening to internally press down on the gantry opening, thus resisting the influence of the second set of calibration's external support on the positional dimensions of the first and third sets.

[0076] The method further includes: setting up a laser rangefinder sensor to detect the correction dimension of the gantry, and feeding back the correction dimension to the display screen in real time for display, so as to show the correction data in real time.

[0077] Furthermore, the step of determining the points that need to be corrected according to the design standard dimensions includes: setting up photoelectric switches to detect the opening width corresponding to each point of the gantry; comparing the detected opening width with the design standard width; and if the error exceeds a set threshold, determining that the point is the point that needs to be corrected.

[0078] The method also includes: after calibration, the gantry is transported back to the photoelectric switch in front of the calibration mechanism by the rollers of the conveyor platform. The photoelectric switch detects whether the calibrated dimensions meet the standard. If they do not meet the standard requirements, the gantry is returned for recalibration. If the calibration meets the standard, the gantry is transported forward to calibrate one point.

[0079] In one embodiment, if the first point needs correction, the correction system will control the gantry to stop at the second correction mechanism at the first point. Based on the actual dimensions of the second point, it will apply internal pressure or external support. Simultaneously, the first correction mechanism will apply corresponding external support or internal pressure to the gantry during the correction of the second point. If the second to eleventh points need correction, the required correction points will automatically stop at the second correction mechanism position for correction. The first and third correction mechanisms will simultaneously apply internal support or external pressure to the relevant positions to reduce deformation. If the twelfth point needs correction, it will automatically stop at the third correction mechanism position for internal support or external pressure correction, and then the second correction mechanism will apply external pressure or internal support. After all 12 points are corrected, the gantry will automatically retract to the front end of the gantry correction mechanism. During the gantry retraction process, the third correction mechanism will automatically collect the corrected gantry opening dimensions at the 12 points. The system will judge the corrected dimensions of the 12 points. Gantry that passes the judgment will be released again through the correction system; those that fail will be corrected at the unqualified points.

[0080] As can be seen, this invention provides a combined mast correction control method for forklift mast welding. It employs three sets of correction mechanisms arranged in a straight line, with the second set fixed in place. The first and third sets of correction mechanisms can move servo-driven along the length direction. For masts of different lengths, the first and third sets of correction mechanisms can automatically move to the corresponding positions to achieve the three-stage correction of the mast. This solves the problem of low efficiency and inconvenience caused by the need for multiple repeated corrections in forklift mast correction, improving the automation level of forklift mast correction and increasing correction efficiency and convenience.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A combined mast alignment system for welding forklift masts, characterized in that, Includes: PLC controller, photoelectric sensor switch, first set of calibration mechanism, second set of calibration mechanism and third set of calibration mechanism; The second set of correction mechanisms is fixedly installed at a set position on the conveyor frame, and the first set of correction mechanisms and the third set of correction mechanisms are movably arranged on both sides of the second set of correction mechanisms; The photoelectric sensor switch is installed at the front end of the calibration station to detect whether the gantry has reached the calibration station. The PLC controller is connected to the photoelectric sensor switch, the first set of calibration mechanisms, the second set of calibration mechanisms, and the third set of calibration mechanisms respectively. When the gantry reaches the calibration station, the PLC controller controls the three sets of calibration mechanisms to automatically extend and retract according to the received gantry opening size, so as to ensure that the gantry passes over the three sets of calibration mechanisms and stops the calibration point of the gantry at the second set of calibration mechanisms. Then, the PLC controller controls the second set of calibration mechanisms to perform internal pressure or external support calibration at the calibration point, and controls the first set of calibration mechanisms and the third set of calibration mechanisms to move to the corresponding positions to perform internal support or external pressure on the gantry, so as to reduce gantry deformation.

2. The combined mast alignment system for forklift mast welding according to claim 1, characterized in that, Also includes: Sliding platform; The sliding frame is slidably mounted on the conveyor frame, the first set of correction mechanisms is mounted on one of the sliding frames, and the third set of correction mechanisms is mounted on another sliding frame.

3. The combined mast alignment system for forklift mast welding according to claim 2, characterized in that, The sliding frame includes: a drive wheel, a base, and a conveyor roller; The base has drive wheels at both ends of its bottom, which are slidably mounted on the guide rail of the conveyor frame. The top surface of the base has a conveyor roller, which is at the same height as the conveyor roller on the conveyor frame. The base is also used to set the first set of correction mechanisms or the third set of correction mechanisms. The drive wheel is connected to the servo motor, and the servo motor is used to drive the drive wheel to move along the guide rail.

4. The combined mast alignment system for forklift mast welding according to claim 3, characterized in that, The first set of calibration mechanisms, the second set of calibration mechanisms, and the third set of calibration mechanisms each include: a hydraulic cylinder, a calibration head, a base, and a mounting base; The mounting base is provided at both ends of the base, the hydraulic cylinder is provided on the outer side of the mounting base, the alignment head is provided on the inner side of the mounting base, and the alignment head is connected to the output end of the hydraulic cylinder. The base is provided with a sliding groove, and the correction head is slidably mounted on the sliding groove. The hydraulic cylinder drives the correction head to extend and retract along the sliding groove to provide internal support or external pressure to the correction point of the gantry.

5. A combined mast correction control method for forklift mast welding, using the correction system described in any one of claims 1 to 4, characterized in that, include: Three sets of calibration mechanisms are set up sequentially at the calibration station of the conveyor frame, and the three sets of calibration equipment are arranged in a line. The second set of calibration mechanisms is fixedly installed, while the first and third sets of calibration mechanisms are movably arranged on both sides of the second set of calibration mechanisms to perform servo movement along the length direction. The entire length of the gantry was inspected, and the opening dimensions at multiple points were collected. The points that needed to be corrected were determined based on the design standard dimensions. The points that need to be corrected are stopped one by one by the second set of correction mechanisms for corresponding external support or internal pressure, and the first and third sets of correction mechanisms are simultaneously moved to the corresponding positions to provide internal support or external pressure to the gantry in order to reduce gantry deformation.

6. The combined mast correction control method for forklift mast welding according to claim 5, characterized in that, Also includes: After all the points that need to be calibrated have been calibrated, the gantry is controlled to return to the forward conveying position of the gantry calibration mechanism. During the gantry return process, the third calibration mechanism automatically collects the gantry opening dimensions corresponding to the calibrated points. The dimensions of multiple points after correction are judged. If the gantry is deemed to be qualified, it is released again through the correction mechanism. If it is deemed to be unqualified, the unqualified points are corrected again.

7. The combined mast correction control method for forklift mast welding according to claim 6, characterized in that, Also includes: When the gantry is being calibrated, the calibrating head of the calibrating mechanism is extended or retracted by the hydraulic servo system of the calibrating mechanism according to the opening size of the gantry, the length of the channel steel and the width of the wing plate, so as to accommodate the passage of the gantry. When the gantry is detected by a photoelectric sensor switch at the calibration station, the full length dimension of the gantry is checked based on the length of the gantry channel steel and the rotation speed of the rollers on the conveyor platform. After the gantry's full length dimensions are checked, the gantry is controlled to return to the forward conveying position of the gantry alignment mechanism so that the gantry can re-enter the alignment station for gantry alignment.

8. The combined mast correction control method for forklift mast welding according to claim 7, characterized in that, Also includes: When the second set of correction mechanisms performs internal pressure correction on the corresponding points of the gantry, the first set of correction mechanisms and / or the third set of correction mechanisms are controlled to move to the external support position of the gantry opening to externally support the gantry opening, in order to resist the influence of the second set of internal pressure on the gantry size. When the second set of correction mechanisms performs external support correction on the corresponding points of the gantry, the first set of correction mechanisms and / or the third set of correction mechanisms are controlled to move to the internal pressure position of the gantry opening to internally press the gantry opening, in order to resist the influence of the second set of external support correction on the dimensions.

9. The combined mast correction control method for forklift mast welding according to claim 8, characterized in that, The process of determining the points that need to be corrected based on design standard dimensions includes: A laser rangefinder sensor is installed to detect the correction dimensions of the gantry and the correction dimensions are fed back to the display screen in real time for display of the correction data. Photoelectric switches are set up to detect the opening width corresponding to each point on the gantry. The detected opening width is compared with the design standard width. If the error exceeds the set threshold, the point is determined to be the point that needs to be corrected.

10. The combined mast correction control method for forklift mast welding according to claim 9, characterized in that, Also includes: After calibration, the gantry is transported back to the photoelectric switch in front of the calibration mechanism via the rollers of the conveyor platform. The photoelectric switch checks whether the calibrated dimensions meet the standard. If they do not meet the standard requirements, the gantry is returned for recalibration. If the calibration meets the standard, the gantry is transported forward to calibrate one point.

Images