Double-station stator laser welding device and double-station welding method thereof

Abstract

The application relates to a double-station stator laser welding device, which comprises a rack, a support frame, a conveying line for conveying workpieces, a tray for carrying the workpieces, a blocking lifting device for lifting and moving the tray, a laser welding device and a control system, the conveying line is arranged on the rack, the bottom of the tray is provided with a collision block, and the tray is arranged on the conveying line; when welding of a first workpiece is completed, a moving cylinder drives a lifting assembly to move, so that a second workpiece enters a welding space; then a servo motor drives a laser welding gun to move through a sliding block to weld the second workpiece, so that the stator and the compressor shell of the second workpiece are welded together, the structural strength, the sealing performance and the heat dissipation capacity of the air conditioner compressor are ensured, normal operation and long-term stability of the air conditioner compressor are ensured, double-station work is realized, and the welding efficiency is improved.

Description

Technical Field

[0001] This invention relates to a dual-station stator laser welding equipment and a dual-station welding method thereof. Background Technology

[0002] In the manufacturing process of air conditioner compressors, welding is required between the compressor pump body and the casing. Welding the casing and stator ensures the structural strength, sealing, and heat dissipation capacity of the air conditioner compressor, and guarantees its normal operation and long-term stability. Welding is a common and reliable connection method, widely used in the manufacturing process.

[0003] The following are the general welding steps and some common welding methods:

[0004] Preparation: Before welding, ensure that the housing and stator surfaces are clean and that suitable weld joints are ready. This includes cleaning the contact surfaces of both components, removing any oxides, dirt, or coatings.

[0005] Welding methods: Common welding methods include manual arc welding, argon arc welding, and laser welding. The specific method chosen depends on the materials of the housing and stator, as well as the design requirements.

[0006] Manual arc welding: This is a traditional welding method that uses an electric arc to generate high temperatures to melt the welding materials and form a weld. The operator controls the position and intensity of the arc using a welding machine to complete the welding.

[0007] Argon arc welding: Argon arc welding is a commonly used inert gas shielded welding method. During the welding process, an inert gas (such as argon) is used to protect the weld seam, preventing oxygen and other impurities from entering, thereby obtaining a high-quality weld seam.

[0008] Laser welding: Laser welding is a high-precision welding method that uses a laser beam to generate extremely high energy density, rapidly melting the welding material and forming a weld. This method typically requires aligning the contact surfaces of the housing and stator before using laser welding equipment to perform the welding.

[0009] Welding process: Depending on the selected welding method, the operator places the electrode, welding wire, or laser welding equipment on the contact surface between the housing and the stator. Then, depending on the specific welding method, the welding current, voltage, or laser parameters are controlled to melt the welding material and form a strong weld.

[0010] Inspection and Finishing: After welding is completed, the weld is inspected to ensure that the welding quality meets the design and manufacturing standards. If necessary, the weld is finished, ground, or surface-treated to achieve the required appearance and performance requirements.

[0011] Existing welding methods cannot achieve fully automated welding, have low welding efficiency, and cannot achieve dual-station welding. Summary of the Invention

[0012] The primary objective of this invention is to provide a dual-station stator laser welding device that features automatic welding, high welding efficiency, and stable welding quality.

[0013] The second objective of this invention is to provide a dual-station welding method that is automated, has high welding efficiency, and provides stable welding quality.

[0014] The first objective of this invention is achieved as follows:

[0015] A dual-station stator laser welding equipment includes a frame, a support frame, a conveyor line for transporting workpieces, a tray for carrying workpieces, a blocking and lifting device for lifting and moving the tray, a laser welding device, and a control system. The conveyor line is mounted on the frame, and the bottom of the tray is provided with a collision block. The tray sits on the conveyor line.

[0016] The blocking and lifting device is mounted on the frame. The blocking and lifting device includes a blocking block, a material arrival sensing module, a lifting assembly, and a transfer cylinder. The lifting telescopic rod of the lifting assembly faces the conveyor line. The transfer telescopic rod of the transfer cylinder is connected to the lifting assembly. The switch of the material arrival sensing module is mounted on the blocking block.

[0017] The laser welding device includes a sliding plate, a slider, at least one laser welding gun, a lifting cylinder, a servo motor, and a transmission assembly. The sliding plate is slidably mounted on a support frame. The lifting cylinder is mounted on the support frame and connected to the sliding plate. The lifting cylinder drives the sliding plate to slide along the length of the support frame. The slider is slidably mounted on the sliding plate. One end of the transmission assembly is connected to the servo motor, and the other end of the transmission assembly is connected to the slider. The servo motor drives the slider to slide along the length of the sliding plate through the transmission assembly. The laser welding guns are spaced apart on the slider, and a welding space is formed between the laser welding guns.

[0018] The material receiving sensing module, lifting assembly, transfer cylinder, lifting cylinder, and servo motor are electrically connected to the control system.

[0019] A pallet carrying the first and second workpieces moves along the conveyor line. When the pallet's collision block touches the blocking block, the pallet stops moving, and the lifting assembly lifts the pallet upwards, separating it from the conveyor line. Then, the lifting cylinder moves the sliding plate, allowing the first workpiece to enter the welding space. Next, the servo motor drives the laser welding gun via the slider to weld the first workpiece, thus welding the stator of the first workpiece and the compressor housing together. This ensures the structural strength, sealing, and heat dissipation capacity of the air conditioning compressor, guaranteeing its normal operation and long-term stability. After the first workpiece is welded, the transfer cylinder moves the lifting assembly, allowing the second workpiece to enter the welding space. Then, the servo motor drives the laser welding gun via the slider to weld the second workpiece, thus welding the stator of the second workpiece and the compressor housing together. This ensures the structural strength, sealing, and heat dissipation capacity of the air conditioning compressor, guaranteeing its normal operation and long-term stability. This achieves dual-station operation, improving welding efficiency. Moreover, during laser welding, a high-energy laser beam is focused on the weld area, heating the workpiece to its melting point, and the two workpieces are joined together by controlling the welding parameters. Due to the high energy density and small heat-affected zone of laser welding, precise welding can be achieved, reducing deformation and heat impact. After the first and second workpieces are welded, the lifting assembly moves down, and the pallet carrying the first and second workpieces moves down and sits on the conveyor line. The collision block moves away from the blocking block, and the conveyor line carries the pallet carrying the first and second workpieces into the next process.

[0020] The primary objective of this invention can also be achieved using the following technical measures:

[0021] Furthermore, the laser welding device also includes an extension arm and a protective cover. A connecting shaft is positioned above the welding space corresponding to the slider. One end of the extension arm is connected to the connecting shaft, and the other end is connected to the laser welding gun. The protective cover is located at the bottom of the connecting shaft and above the welding space. When the lifting cylinder moves the sliding plate downwards, the protective cover moves down to cover the workpiece and seal the upper opening of the compressor housing, preventing welding fumes from entering the compressor cavity and improving the compressor's stability.

[0022] Furthermore, the lifting assembly includes a lifting cylinder, a top plate, a bottom plate, and lifting rods. The lifting rods are spaced apart on the bottom plate, and the top plate has sleeves spaced apart corresponding to the positions of the lifting rods. The top plate is located above the bottom plate, and the upper end of the lifting rods extends through the sleeves toward the tray. The lifting cylinder is mounted on the bottom plate, and the lifting push rod of the lifting cylinder is connected to the top plate. The operation of the lifting cylinder drives the lifting rods to rise and fall.

[0023] Furthermore, the frame has a sliding area, with slide rails on both sides of the sliding area. A sliding block is located at the bottom of the top plate, resting on the slide rails. The transfer cylinder is mounted on the frame, and its transfer extension rod is connected to the top plate. The operation of the transfer cylinder drives the lifting assembly to slide along the slide rails. The sliding area limits the sliding distance of the lifting assembly. By limiting the sliding distance of the lifting assembly through the sliding area, when the transfer cylinder moves the lifting assembly, the pallet follows the lifting assembly. Because the sliding area limits the movement distance of the lifting assembly, after the lifting assembly moves, the second workpiece on the pallet precisely enters the welding space, preventing workpiece position displacement and ensuring the welding effect.

[0024] Furthermore, the transmission assembly is a lead screw transmission assembly, which includes a lead screw and a nut. The lead screw is connected to the output shaft of a servo motor, and the nut is connected to the slider. The servo motor drives the lead screw to rotate, the nut slides along the length of the lead screw, and the slider moves up and down synchronously with the nut.

[0025] Furthermore, the servo motor controls the slider's lifting range to be 10-50mm. The slider's stroke is limited to 10-50mm. Since the laser welding gun is connected to the slider, the laser welding gun's stroke is limited to 10-50mm, ensuring that the weld seam between the stator and the compressor housing of the workpiece is 10-50mm. This ensures the structural strength, sealing, and heat dissipation capacity of the air conditioning compressor, and guarantees its normal operation and long-term stability.

[0026] Furthermore, the workpiece includes an air conditioner compressor housing and a stator, with the stator positioned within the inner cavity of the air conditioner compressor housing.

[0027] Furthermore, the material arrival sensing module is an inflow proximity sensor switch or a strip-shaped sensing plate. Inflow proximity sensors are used on conveyor lines to detect the position of objects on the conveyor line or to perform specific operations. An inflow proximity sensor switch is a sensor that uses electromagnetic principles to detect the approach of objects. When an object approaches the sensor switch, the switch generates an electromagnetic field; when the object enters this electromagnetic field, the sensor switch detects its presence.

[0028] On conveyor lines, proximity sensors are typically installed at locations where objects need to pass or perform specific operations. When an object approaches the sensor, it outputs a signal to control further operations on the conveyor line, such as starting the next work phase, stopping the flow, or performing other automated operations.

[0029] This type of inductive switch is fast and reliable, making it suitable for high-speed conveyor lines and automated production lines. It can help improve production efficiency, reduce manual intervention, and ensure objects are in the correct position, thereby enabling the smooth operation of automated production processes.

[0030] A strip-shaped induction plate is typically a type of magnetic sensor used to detect the presence or location of magnetic objects. It usually consists of a thin, strip-shaped sensor and a control unit. When a magnetic object approaches the induction plate, the sensor detects the change in the magnetic field and outputs a corresponding signal through the control unit.

[0031] Furthermore, the tray is provided with two workpiece placement areas. The first workpiece and the second workpiece are placed in their respective workpiece placement areas on the tray, allowing two workpieces to be placed on one tray at the same time, thus realizing dual-station welding.

[0032] Furthermore, it also includes a through-beam sensor, which is electrically connected to the control system. The through-beam sensor includes a transmitter and a receiver, which are mounted on the frame, forming a monitoring area between them. The welding space is located within the monitoring area. A through-beam sensor is a commonly used photoelectric sensor used to detect the presence or position of an object. It consists of a transmitter and a receiver, and detects objects by emitting and receiving a beam of light. On a conveyor line, the through-beam sensor can be used to ensure material availability, i.e., to detect whether an object is in a designated position. When the through-beam sensor detects a workpiece, the dual-station stator laser welding equipment starts; when the through-beam sensor does not detect a workpiece, the dual-station stator laser welding equipment shuts down. Workers need to place additional workpieces on the tray, ensuring that the tray holds at least two workpieces before continuing work, thus ensuring consistency in subsequent processes.

[0033] The second objective of this invention is achieved as follows:

[0034] A dual-station stator laser welding method using a dual-station stator laser welding equipment includes the following steps:

[0035] Step 1: The pallet holds the first and second workpieces. The conveyor line drives the pallet along the conveyor line until the pallet's collision block touches the blocking block and stops.

[0036] Step 2: The pallet is located above the material arrival sensing module. The material arrival sensing module detects the presence of the pallet and sends a signal to the control system. The control system activates the lifting cylinder, which lifts the pallet upward through the lifting rod, causing the pallet to leave the conveyor line.

[0037] Step 3: The lifting cylinder moves the slide plate down, allowing the first workpiece to enter the welding space. At the same time, the protective cover closes the upper opening of the first workpiece to prevent welding fumes from entering the inner cavity of the first workpiece.

[0038] Step 4: As the first workpiece enters the welding space, the transmitter beam is blocked by the first workpiece, causing the receiver to not receive a signal. The through-beam switch stops working, thus ensuring that the first workpiece is present in the welding space. If the transmitter beam is received by the receiver, the through-beam switch continues to work, indicating that the first workpiece was missing from the tray. The through-beam switch sends a feedback signal to the control system, and the dual-station stator laser welding equipment stops operating. At this time, the first workpiece needs to be placed back on the tray for the dual-station stator laser welding equipment to operate normally.

[0039] Step 5: The laser welding gun is started. During the laser welding process, the high-energy laser beam is focused on the weld seam area, heating the first workpiece to its melting point, and the air conditioner compressor housing and stator are welded together by controlling the welding parameters.

[0040] Step 6: The servo motor starts and controls the slider to slide through the lead screw transmission assembly, thereby controlling the laser welding gun to slide and weld the first workpiece, so that the first workpiece produces a weld with a length of 10-50mm, completing the welding of the first workpiece on the tray.

[0041] Step 7: The control system starts the servo motor and lifting cylinder, and the servo motor controls the laser welding gun to return to the initial position;

[0042] Step 8: The control system starts the transfer cylinder, which drives the lifting component to move, thereby moving the tray. At this time, the second workpiece on the tray enters the welding space. The beam of the transmitter is blocked by the second workpiece, so the receiver does not receive a signal. The through-beam switch stops working, thus ensuring that there is a second workpiece in the welding space.

[0043] Step 9: The lifting cylinder moves the slide plate down, allowing the second workpiece to enter the welding space. At the same time, the protective cover closes the upper opening of the second workpiece to prevent welding fumes from entering the inner cavity of the second workpiece.

[0044] Step 10: The laser welding gun is started. During the laser welding process, a high-energy laser beam is focused on the weld area, heating the second workpiece to its melting point. The air conditioner compressor housing and stator are welded together by controlling the welding parameters.

[0045] Step 11: The servo motor starts and controls the slider to slide through the lead screw transmission assembly, thereby controlling the laser welding gun to slide and weld the second workpiece, so that the second workpiece produces a weld with a length of 10-50mm, completing the welding of the second workpiece on the tray.

[0046] Step 12: After the second workpiece on the tray is welded, the control system starts the servo motor and lifting cylinder. The servo motor controls the laser welding gun to return to the initial position while the protective cover leaves the upper opening of the second workpiece.

[0047] Step Thirteen: The control system starts the lifting cylinder, which drives the lifting rod to descend. The pallet moves down under the action of gravity, allowing the pallet to sit on the conveyor line. The conveyor line carries the pallet and the first and second welded workpieces on the pallet into the next process. Then the conveyor line carries the next pallet along the conveyor line until the pallet's collision block touches the blocking block and stops. This cycle repeats.

[0048] The beneficial effects of this invention are as follows:

[0049] A pallet carrying the first and second workpieces moves along the conveyor line. When the pallet's collision block touches the blocking block, the pallet stops moving, and the lifting assembly lifts the pallet upwards, separating it from the conveyor line. Then, the lifting cylinder moves the sliding plate, allowing the first workpiece to enter the welding space. Next, the servo motor drives the laser welding gun via the slider to weld the first workpiece, thus welding the stator of the first workpiece and the compressor housing together. This ensures the structural strength, sealing, and heat dissipation capacity of the air conditioning compressor, guaranteeing its normal operation and long-term stability. After the first workpiece is welded, the transfer cylinder moves the lifting assembly, allowing the second workpiece to enter the welding space. Then, the servo motor drives the laser welding gun via the slider to weld the second workpiece, thus welding the stator of the second workpiece and the compressor housing together. This ensures the structural strength, sealing, and heat dissipation capacity of the air conditioning compressor, guaranteeing its normal operation and long-term stability. This achieves dual-station operation, improving welding efficiency. Moreover, during laser welding, a high-energy laser beam is focused on the weld area, heating the workpiece to its melting point, and the two workpieces are joined together by controlling the welding parameters. Due to the high energy density and small heat-affected zone of laser welding, precise welding can be achieved, reducing deformation and heat impact. After the first and second workpieces are welded, the lifting assembly moves down, and the pallet carrying the first and second workpieces moves down and sits on the conveyor line. The collision block moves away from the blocking block, and the conveyor line carries the pallet carrying the first and second workpieces into the next process. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of a dual-station stator laser welding equipment (the tray sits on the conveyor line).

[0051] Figure 2 This is a schematic diagram of a dual-station stator laser welding equipment (the conveyor line is hidden, and the tray sits on the conveyor line).

[0052] Figure 3 This is a cross-sectional view of a dual-station stator laser welding equipment (the conveyor line is hidden, and the tray sits on the conveyor line).

[0053] Figure 4This is a schematic diagram of a dual-station stator laser welding equipment (pallet lifted).

[0054] Figure 5 This is a schematic diagram of a dual-station stator laser welding equipment (with the conveyor line hidden and the tray in a lifted state).

[0055] Figure 6 This is a cross-sectional view of a dual-station stator laser welding equipment (with the conveyor line hidden and the pallet in a lifted position).

[0056] Figure 7 This is a schematic diagram of a dual-station stator laser welding equipment (with the conveyor line hidden and the tray lifted and moved).

[0057] Figure 8 This is a cross-sectional view of a dual-station stator laser welding equipment (with the conveyor line hidden and the tray lifted and moving).

[0058] Figure 9 This is a schematic diagram of the welded workpiece.

[0059] Figure 10 This is a top view of the welded workpiece. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0061] Implementation examples, in conjunction with Figures 1 to 10 As shown, a dual-station stator laser welding equipment includes a frame 1, a support frame 2, a conveyor line 3 for transporting workpieces, a tray 4 for carrying workpieces, a blocking and lifting device 5 for lifting and moving the tray 4, a laser welding device 6, and a control system. The conveyor line 3 is mounted on the frame 1, and the bottom of the tray 4 is provided with a collision block 42. The tray 4 sits on the conveyor line 3.

[0062] The blocking and lifting device 5 is mounted on the frame 1. The blocking and lifting device 5 includes a blocking block 51, a material arrival sensing module 52, a lifting assembly 53, and a transfer cylinder 54. The lifting telescopic rod of the lifting assembly 53 faces the conveyor line 3. The transfer telescopic rod of the transfer cylinder 54 is connected to the lifting assembly 53. The switch of the material arrival sensing module 52 is mounted on the blocking block 51.

[0063] The laser welding device 6 includes a slide plate 61, a slider 62, three laser welding guns 63, a lifting cylinder 64, a servo motor 65, and a transmission assembly (not shown in the figure). The slide plate 61 is slidably mounted on the support frame 2. The lifting cylinder 64 is mounted on the support frame 2 and connected to the slide plate 61. The lifting cylinder 64 drives the slide plate 61 to slide along the length of the support frame 2. The slider 62 is slidably mounted on the slide plate 61. One end of the transmission assembly is connected to the servo motor 65, and the other end of the transmission assembly is connected to the slider 62. The servo motor 65 drives the slider 62 to slide along the length of the slide plate 61 through the transmission assembly. The laser welding guns 63 are spaced apart on the slider 62, and the laser welding guns 63 form a welding space 100.

[0064] The material receiving sensing module 52, lifting component 53, transfer cylinder 54, lifting cylinder 64 and servo motor 65 are electrically connected to the control system.

[0065] Furthermore, the laser welding device 6 also includes an extension arm 68 and a protective cover 66. The slider 62 is provided with a connecting shaft 67 above the welding space 100. One end of the extension arm 68 is connected to the connecting shaft 67, and the other end of the extension arm 68 is connected to the laser welding gun 63. The protective cover 66 is provided at the bottom of the connecting shaft 67 and located above the welding space 100.

[0066] Furthermore, the lifting assembly 53 includes a lifting cylinder 531, a top plate 532, a bottom plate 533, and lifting rods 534. The lifting rods 534 are spaced apart on the bottom plate 533. The top plate 532 has sleeves 535 spaced apart from the lifting rods 534. The top plate 532 is located above the bottom plate 533. The upper end of the lifting rods 534 passes through the sleeves 535 and extends toward the tray 4. The lifting cylinder 531 is mounted on the bottom plate 533. The lifting push rod of the lifting cylinder 531 is connected to the top plate 532. The operation of the lifting cylinder 531 drives the lifting rods 534 to rise and fall.

[0067] Furthermore, the frame 1 has a sliding area 11, and slide rails 12 are provided on both sides of the sliding area 11. A sliding block 5321 is provided at the bottom of the top plate 532, and the sliding block 5321 sits on the slide rail 12. The transfer cylinder 54 is provided on the frame 1, and the transfer telescopic rod of the transfer cylinder 54 is connected to the top plate 532. When the transfer cylinder 54 works, it drives the lifting assembly 53 to slide along the slide rail 12. The sliding area 11 limits the sliding distance of the lifting assembly 53.

[0068] Furthermore, the transmission assembly is a lead screw transmission assembly, which includes a lead screw and a nut. The lead screw is connected to the output shaft of the servo motor 65, and the nut is connected to the slider 62. The servo motor 65 drives the lead screw to rotate, the nut slides along the length of the lead screw, and the slider 62 moves up and down synchronously with the nut.

[0069] Furthermore, the servo motor 65 controls the slider 62 to rise and fall within a range of 20mm.

[0070] Furthermore, the workpiece includes an air conditioner compressor housing 200 and a stator 300, with the stator 300 disposed within the cavity of the air conditioner compressor housing 200.

[0071] Furthermore, the material arrival sensing module 52 is an inflow proximity sensing switch.

[0072] Furthermore, it also includes a through-beam switch (not shown in the figure), which is electrically connected to the control system. The through-beam switch includes a transmitter and a receiver, which are mounted on the frame 1, forming a monitoring area between the transmitter and the receiver. The welding space 100 is located within the monitoring area.

[0073] Furthermore, the tray 4 is provided with two workpiece placement areas 41.

[0074] In another embodiment, the material receiving sensing module 52 is a long strip-shaped sensing sheet.

[0075] The inflow proximity sensor used on conveyor line 3 is used to detect the position of an object on conveyor line 3 or to perform specific operations. The inflow proximity sensor is a sensor that uses electromagnetic principles to detect the approach of an object. When an object approaches the sensor, the sensor generates an electromagnetic field; when the object enters this electromagnetic field, the sensor detects its presence.

[0076] On conveyor line 3, inflow proximity sensors are typically installed at locations where objects need to pass or perform specific operations. When an object approaches the sensor, the sensor outputs a signal to control further operations on conveyor line 3, such as starting the next working stage, stopping the flow, or performing other automated operations.

[0077] This inductive switch is fast and reliable, making it suitable for high-speed conveyor lines and automated production lines. It helps improve production efficiency, reduce manual intervention, and ensures objects are in the correct position, thus facilitating the smooth operation of automated production processes.

[0078] A strip-shaped induction plate is typically a type of magnetic sensor used to detect the presence or location of magnetic objects. It usually consists of a thin, strip-shaped sensor and a control unit. When a magnetic object approaches the induction plate, the sensor detects the change in the magnetic field and outputs a corresponding signal through the control unit.

[0079] A through-beam sensor is a commonly used photoelectric sensor used to detect the presence or position of an object. It consists of a transmitter and a receiver, and detects objects by emitting and receiving a beam of light.

[0080] On conveyor line 3, a photoelectric sensor is used to ensure material presence, i.e., to detect whether an object is in a designated position. The working principle is as follows: a transmitter emits a beam of light, which is transmitted to a receiver. When an object appears in the path of the beam, the beam is blocked, and the receiver cannot receive a sufficient light signal. By detecting the output signal of the receiver, the presence or position of the object can be determined.

[0081] By installing a beam switch at an appropriate location on conveyor line 3, it is possible to monitor in real time whether the object is in the correct position. If the beam is blocked or the signal output by the receiver changes, it can be determined that the object may not be in the designated position, thereby triggering an alarm or other appropriate measures.

[0082] Laser welding is a high-precision, non-contact welding technology that can be used to join compressor housings and stators 300. During laser welding, a high-energy laser beam is focused on the weld seam 600, heating the workpieces to their melting point. By controlling the welding parameters, the two workpieces are joined together. Due to the high energy density and small heat-affected zone of laser welding, precise welding can be achieved, reducing deformation and heat impact. By controlling the laser welding parameters, the width of the weld seam 600 can be ensured to reach the expected 20mm.

[0083] Dual-station welding method of dual-station stator laser welding equipment:

[0084] Step 1: The first workpiece 400 and the second workpiece 500 are placed on the pallet 4. The conveyor line 3 drives the pallet 4 to be transported along the conveyor line 3 until the collision block 42 of the pallet 4 touches the blocking block 51 and stops.

[0085] Step 2: The tray 4 is located above the material arrival sensing module 52. The material arrival sensing module 52 detects the presence of the tray 4 and sends a signal to the control system. The control system starts the lifting cylinder 531. The lifting cylinder 531 lifts the tray 4 upward through the lifting rod 534, causing the tray 4 to leave the conveyor line 3.

[0086] Step 3: The lifting cylinder 64 moves the slide plate 61 down, allowing the first workpiece 400 to enter the welding space 100. At the same time, the protective cover 66 closes the upper opening of the first workpiece 400 to prevent welding fumes from entering the inner cavity of the first workpiece 400.

[0087] Step 4: As the first workpiece 400 enters the welding space 100, the beam of the transmitter is blocked by the first workpiece 400, causing the receiver to not receive a signal. The through-beam switch stops working, thus ensuring that the first workpiece 400 is present in the welding space 100. If the beam of the transmitter is received by the receiver, the through-beam switch continues to work, indicating that the first workpiece 400 was missing from the tray 4. The through-beam switch sends a feedback signal to the control system, and the dual-station stator laser welding equipment stops operating. At this time, the first workpiece 400 needs to be placed back on the tray 4 for the dual-station stator laser welding equipment to operate normally.

[0088] Step 5: The laser welding gun 63 is started. During the laser welding process, the high-energy laser beam is focused on the weld area, heating the first workpiece 400 to the melting point, and welding the air conditioner compressor housing 200 and stator 300 together by controlling the welding parameters.

[0089] Step 6: Servo motor 65 starts, and servo motor 65 controls slider 62 to slide through lead screw transmission assembly, thereby controlling laser welding gun 63 to slide to weld the first workpiece 400, so that the first workpiece 400 produces a weld seam with a length of 10-50mm, completing the welding of the first workpiece on tray 4.

[0090] Step 7: The control system starts the servo motor 65 and the lifting cylinder 64. The servo motor 65 controls the laser welding gun 63 to return to the initial position.

[0091] Step 8: The control system starts the transfer cylinder 54, which drives the lifting component 53 to move, thereby moving the tray 4. At this time, the second workpiece 500 on the tray 4 enters the welding space 100. The beam of the transmitter is blocked by the second workpiece 500, so the receiver does not receive a signal. The photoelectric switch stops working, which proves that the second workpiece 500 is placed in the tray 4, ensuring that the second workpiece 500 exists in the welding space 100. If the beam of the transmitter is received by the receiver, the photoelectric switch continues to work, which proves that the second workpiece 500 is missing from the tray 4. The photoelectric switch feeds a signal to the control system, and the dual-station stator laser welding equipment stops running. At this time, the second workpiece 500 needs to be placed back on the tray 4 for the dual-station stator laser welding equipment to run normally.

[0092] Step 9: The lifting cylinder 64 drives the slide plate 61 to move down, allowing the second workpiece 500 to enter the welding space 100. At the same time, the protective cover 66 closes the upper opening of the second workpiece 500 to prevent welding fumes from entering the inner cavity of the second workpiece 500.

[0093] Step 10: The laser welding gun 63 is started. During the laser welding process, the high-energy laser beam is focused on the weld area, heating the second workpiece 500 to the melting point, and welding the air conditioner compressor housing 200 and stator 300 together by controlling the welding parameters.

[0094] Step 11: Servo motor 65 starts, and servo motor 65 controls slider 62 to slide through lead screw transmission assembly, thereby controlling laser welding gun 63 to slide to weld the second workpiece 500, so that the second workpiece 500 produces a weld seam with a length of 10-50mm, completing the welding of the second workpiece on tray 4.

[0095] Step 12: After the second workpiece 500 on tray 4 is welded, the control system starts the servo motor 65 and the lifting cylinder 64. The servo motor 65 controls the laser welding gun 63 to return to the initial position, and at the same time the protective cover 66 leaves the upper opening of the second workpiece 500.

[0096] Step Thirteen: The control system starts the lifting cylinder 531, which drives the lifting rod 534 to descend. The pallet 4 moves down under the action of gravity, so that the pallet 4 sits on the conveyor line 3. The conveyor line 3 carries the pallet 4 and the first and second welded workpieces 500 on the pallet 4 into the next process. Then the conveyor line 3 carries the next pallet 4 along the conveyor line 3 until the collision block 42 of the pallet 4 touches the blocking block 51 and stops. This cycle repeats.

[0097] Detect whether there is a workpiece in tray 4:

[0098] Conveyor line 3 drives pallet 4 to travel along conveyor line 3 until the collision block 42 of pallet 4 touches the blocking block 51 and stops. The material sensing module detects the presence of pallet 4 and lifts pallet 4. At the same time, the photoelectric switch detects whether there is a workpiece in the welding space 100. If there is a workpiece, it proves that there is a workpiece in pallet 4 and the dual-station stator laser welding equipment works normally. If the photoelectric switch detects that there is no workpiece in the welding space 100, it proves that there is no workpiece in pallet 4. The photoelectric switch feeds back a signal to the control system and the dual-station stator laser welding equipment stops running.

Claims

1. A dual-station stator laser welding equipment, comprising a frame, a support frame, a conveyor line for transporting workpieces, a tray for carrying workpieces, a blocking and lifting device for lifting and moving the tray, a laser welding device, and a control system, characterized in that: The conveyor line is mounted on a frame, and the bottom of the tray is provided with a collision block. The tray sits on the conveyor line. The blocking and lifting device is mounted on the frame. The blocking and lifting device includes a blocking block, a material arrival sensing module, a lifting assembly, and a transfer cylinder. The lifting telescopic rod of the lifting assembly faces the conveyor line. The transfer telescopic rod of the transfer cylinder is connected to the lifting assembly. The switch of the material arrival sensing module is mounted on the blocking block. The laser welding device includes a sliding plate, a slider, at least one laser welding gun, a lifting cylinder, a servo motor, and a transmission assembly. The sliding plate is slidably mounted on a support frame. The lifting cylinder is mounted on the support frame and connected to the sliding plate. The lifting cylinder drives the sliding plate to slide along the length of the support frame. The slider is slidably mounted on the sliding plate. One end of the transmission assembly is connected to the servo motor, and the other end of the transmission assembly is connected to the slider. The servo motor drives the slider to slide along the length of the sliding plate through the transmission assembly. The laser welding guns are spaced apart on the slider, and a welding space is formed between the laser welding guns. The material receiving sensing module, lifting assembly, transfer cylinder, lifting cylinder and servo motor are electrically connected to the control system respectively; It also includes a through-beam switch, which is electrically connected to the control system. The through-beam switch includes a transmitter and a receiver, which are mounted on a frame and form a monitoring area between the transmitter and the receiver. The welding space is located within the monitoring area. The laser welding device also includes an extension arm and a protective cover. The slider is provided with a connecting shaft above the welding space. One end of the extension arm is connected to the connecting shaft, and the other end of the extension arm is connected to the laser welding gun. The protective cover is provided at the bottom of the connecting shaft and located above the welding space. The lifting assembly includes a lifting cylinder, a top plate, a bottom plate, and lifting rods. The lifting rods are spaced apart on the bottom plate. The top plate has sleeves spaced apart corresponding to the positions of the lifting rods. The top plate is located above the bottom plate. The upper end of the lifting rods passes through the sleeves and extends toward the tray. The lifting cylinder is mounted on the bottom plate. The lifting rod of the lifting cylinder is connected to the top plate. When the lifting cylinder is working, it drives the lifting rods to rise and fall. The frame has a sliding area, and slide rails are provided on both sides of the sliding area. A sliding block is provided at the bottom of the top plate, and the sliding block sits on the slide rail. The transfer cylinder is provided on the frame, and the transfer telescopic rod of the transfer cylinder is connected to the top plate. When the transfer cylinder works, it drives the lifting assembly to slide along the slide rail. The sliding area limits the sliding distance of the lifting assembly. The transmission assembly is a lead screw transmission assembly, which includes a lead screw and a nut. The lead screw is connected to the output shaft of a servo motor, and the nut is connected to the slider. The servo motor drives the lead screw to rotate, the nut slides along the length of the lead screw, and the slider moves up and down synchronously with the nut. The servo motor controls the slider's lifting range to be 10-50mm. The material inlet sensing module is an inlet proximity sensing switch or a long strip-shaped sensing sheet; The workpiece includes an air conditioner compressor housing and a stator, with the stator placed inside the air conditioner compressor housing. The tray is provided with two workpiece placement areas. The workpiece is placed in the first workpiece placement area to form the first workpiece, and the workpiece is placed in the second workpiece placement area to form the second workpiece. When the lifting cylinder moves the sliding plate downward, the protective cover moves down and covers the workpiece, sealing the upper opening of the compressor housing to prevent welding fumes from entering the compressor cavity. By limiting the sliding distance of the lifting assembly through the sliding area, when the transfer cylinder moves the lifting assembly, the pallet moves with the lifting assembly. Because the sliding area limits the moving distance of the lifting assembly, after the lifting assembly moves, the second workpiece on the pallet just enters the welding space, avoiding workpiece position displacement.

2. A dual-station welding method using the dual-station stator laser welding equipment described in claim 1, comprising the following steps: Step 1: The pallet holds the first and second workpieces. The conveyor line drives the pallet along the conveyor line until the pallet's collision block touches the blocking block and stops. Step 2: The pallet is located above the material arrival sensing module. The material arrival sensing module detects the presence of the pallet and sends a signal to the control system. The control system activates the lifting cylinder, which lifts the pallet upward through the lifting rod, causing the pallet to leave the conveyor line. Step 3: The lifting cylinder moves the slide plate down, allowing the first workpiece to enter the welding space. At the same time, the protective cover closes the upper opening of the first workpiece to prevent welding fumes from entering the inner cavity of the first workpiece. Step 4: As the first workpiece enters the welding space, the transmitter beam is blocked by the first workpiece, causing the receiver to not receive a signal. The through-beam switch stops working, thus ensuring that the first workpiece is present in the welding space. If the transmitter beam is received by the receiver, the through-beam switch continues to work, indicating that the first workpiece was missing from the tray. The through-beam switch sends a feedback signal to the control system, and the dual-station stator laser welding equipment stops operating. At this time, the first workpiece needs to be placed back on the tray for the dual-station stator laser welding equipment to operate normally. Step 5: The laser welding gun is started. During the laser welding process, the high-energy laser beam is focused on the weld seam area, heating the first workpiece to its melting point, and the air conditioner compressor housing and stator are welded together by controlling the welding parameters. Step 6: The servo motor starts and controls the slider to slide through the lead screw transmission assembly, thereby controlling the laser welding gun to slide and weld the first workpiece, so that the first workpiece produces a weld with a length of 10-50mm, completing the welding of the first workpiece on the tray. Step 7: The control system starts the servo motor and lifting cylinder, and the servo motor controls the laser welding gun to return to the initial position; Step 8: The control system starts the transfer cylinder, which drives the lifting component to move, thereby moving the tray. At this time, the second workpiece on the tray enters the welding space. The beam of the transmitter is blocked by the second workpiece, so the receiver does not receive a signal. The through-beam switch stops working, thus ensuring that there is a second workpiece in the welding space. Step 9: The lifting cylinder moves the slide plate down, allowing the second workpiece to enter the welding space. At the same time, the protective cover closes the upper opening of the second workpiece to prevent welding fumes from entering the inner cavity of the second workpiece. Step 10: The laser welding gun is started. During the laser welding process, a high-energy laser beam is focused on the weld area, heating the second workpiece to its melting point. The air conditioner compressor housing and stator are welded together by controlling the welding parameters. Step 11: The servo motor starts and controls the slider to slide through the lead screw transmission assembly, thereby controlling the laser welding gun to slide and weld the second workpiece, so that the second workpiece produces a weld with a length of 10-50mm, completing the welding of the second workpiece on the tray. Step 12: After the second workpiece on the tray is welded, the control system starts the servo motor and lifting cylinder. The servo motor controls the laser welding gun to return to the initial position while the protective cover leaves the upper opening of the second workpiece. Step Thirteen: The control system starts the lifting cylinder, which drives the lifting rod to descend. The pallet moves down under the action of gravity, allowing the pallet to sit on the conveyor line. The conveyor line carries the pallet and the first and second welded workpieces on the pallet into the next process. Then the conveyor line carries the next pallet along the conveyor line until the pallet's collision block touches the blocking block and stops. This cycle repeats.

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