Plastic laser welding clamp with three-point positioning function

Abstract

According to the plastic laser welding clamp with the three-point positioning function, two high-precision linear guide rails are installed on an installation base, and two positioning blocks A and B are arranged at the two ends of each high-precision linear guide rail; a spring positioning pin B is arranged on the right side between the two high-precision linear guide rails; the bottom plate is mounted above the mounting base through the bottom plate adapter and the sliding block A; a stop block A, a sliding rail and a stop block B are mounted on the lower end surface of the bottom plate; the workpiece supporting plate is mounted above the bottom plate through the heightening plate; the two air cylinders B are mounted at the left end and the right end of the bottom plate and are connected with the two pressing plates A; the welding bottom plate is installed on the workpiece supporting plate through a silica gel pad, and workpiece positioning blocks A and B are arranged at the two ends of the welding bottom plate. The two spring positioning pins A are oppositely installed on the left portion and the right portion of the upper end of the workpiece supporting plate. The pressing plate B is installed above the installation welding bottom plate through six air cylinders A, and three pieces of tempered glass are installed in three rectangular holes in the pressing plate B. According to the device, three-point positioning of the plastic workpiece to be welded can be achieved, and the welding quality can be effectively ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding, and in particular relates to a plastic laser welding fixture with three-point positioning. Background Art

[0002] Plastic laser welding generally adopts the principle of transmission welding, using near-infrared laser or mid-infrared laser as the heat source of two superimposed plastic parts. Laser welding of plastics has high strength and good effect, and has more cost and effect advantages than traditional ultrasonic welding, hot melt welding, vibration welding and other processes. Plastic refers to a high molecular polymer material that can be plastically processed and formed under certain conditions. Because of its stable performance and easy processing, it is widely used in various industries, such as construction, agriculture, transportation, electronics and other fields.

[0003] During the laser welding process of plastics, the uneven contact surface will lead to poor welding results. Therefore, in order to obtain better welding results, it is usually necessary to apply pressure to the plastic workpieces so that the superimposed plastic workpieces fit tightly and the welding effect is consistent. Existing plastic laser welding fixtures all use glass pressure, which will damage the glass surface during debugging and production, so the glass needs to be replaced frequently. If this method is used to weld larger plastic parts, the entire piece of glass must be replaced if the glass surface is damaged a little, which greatly increases the production cost. And for larger film-like plastic workpieces, the larger the glass, the more difficult it is to make the plastic workpiece fit tightly. Therefore, there is an urgent need to provide a plastic laser welding fixture that can press large-sized film-like plastic workpieces and is easy to replace when the glass is damaged, and has low cost. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a plastic laser welding fixture with three-point positioning. The device has a low manufacturing cost and can achieve stable clamping of the plastic workpiece to be welded. At the same time, it can achieve three-point positioning of the plastic workpiece to be welded, which can effectively ensure the welding quality. It is suitable for the welding of large-sized thin-film plastic parts.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a plastic laser welding fixture with three-point positioning, including a mounting base, a high-precision linear guide rail, a positioning block A, a positioning block B, a spring positioning pin B, a slider A, a base plate adapter, a base plate, a stopper A, a slide rail, a stopper B, a cylinder B, a workpiece support plate, a pressure plate A, a workpiece positioning block A, a workpiece positioning block B, a silicone pad, a welding base plate, a spring positioning pin A, a cylinder A and a pressure plate B and tempered glass;

[0006] The mounting base is arranged horizontally, and its length direction extends in the left-right direction;

[0007] The length direction of the high-precision linear guide rail is consistent with the length direction of the mounting base, and the two high-precision linear guide rails are fixedly mounted side by side on the upper end surface of the mounting base, and the two are symmetrically distributed along the width direction of the mounting base;

[0008] The two positioning blocks A are correspondingly distributed on the outer sides of the left ends of the two high-precision linear guide rails and are fixedly mounted on the mounting base;

[0009] The two positioning blocks B are correspondingly distributed on the outside of the right ends of the two high-precision linear guide rails and fixedly installed on the mounting base;

[0010] The spring positioning pin B is arranged between two high-precision linear guide rails and is fixedly mounted on the right side of the upper end of the mounting base and is located on the left side of the positioning block B;

[0011] Four pairs of sliders A are distributed in sequence along the length direction of the mounting base, and each pair of sliders A is slidably mounted side by side on two high-precision linear guide rails;

[0012] The four pairs of bottom plate adapters correspond to the distribution of the four pairs of sliders A, and each pair of bottom plate adapters is fixedly installed on the upper end of each pair of sliders A. At the same time, the two bottom plate adapters on the left side and the two bottom plate adapters on the right side of the same high-precision linear guide are fixedly connected by a connecting plate;

[0013] The bottom plate is horizontally arranged above the two high-precision linear guide rails, and the lower end thereof is fixedly connected to the upper ends of the four pairs of bottom plate adapters respectively;

[0014] The stopper A is a strip-shaped block, the upper end of which is vertically fixedly connected to the lower end surface of the bottom plate, the left side of the lower end is a 45° inclined slope structure, and the right side of the lower end is a 90° vertical structure, and the stopper A is distributed correspondingly to the spring positioning pin B;

[0015] The length direction of the slide rail is consistent with the length direction of the mounting base; the slide rail is located on the right side of the stopper A and is fixedly mounted on the lower end surface of the bottom plate, and a slider B is slidably mounted on the slide rail;

[0016] The stopper B is a bar-shaped block, which is located on the right side of the stopper A, with its upper end fixedly connected to the slider B, and its lower end lower than the lower end of the stopper A. At the same time, the left side of its lower end is a 60° inclined surface structure, and the right side of its lower end is a 45° inclined surface structure;

[0017] Two cylinders B are relatively distributed on the upper left end and the upper right end of the bottom plate. The cylinders B are arranged vertically, and their bases are vertically fixedly mounted on the upper end surface of the bottom plate.

[0018] The workpiece support plate is horizontally arranged above the bottom plate and is located between the two cylinders B. At the same time, it is located above the upper end of the cylinder barrel of the cylinder B. The workpiece support plate is fixedly connected to the bottom plate through a plurality of heightening plates.

[0019] The two pressing plates A are correspondingly distributed at the upper ends of the two cylinders B. The two pressing plates A are strip-shaped plates, and their outer ends are respectively fixedly mounted on the piston rod ends of the two cylinders B, and their inner ends approach each other and extend to the inner side above the two ends of the workpiece support plate;

[0020] The workpiece positioning block A and the workpiece positioning block B are relatively fixedly connected to the left and right ends of the end surface of the workpiece supporting plate;

[0021] The silicone pad is arranged between the workpiece positioning block A and the workpiece positioning block B, and is closely connected to the upper end surface of the working support plate;

[0022] The size of the welding base plate matches the size of the silicone pad and is snugly connected to the silicone pad;

[0023] Two spring locating pins A are relatively distributed on the left and right parts of the upper end of the workpiece support plate, and the lower end of the spring locating pin A is vertically fixedly connected to the upper end surface of the workpiece support plate after passing through the welding base plate and the silicone pad in sequence, and the height of the upper end in the natural state is higher than the height of the welding base plate, and the height in the downward pressure state is not higher than the height of the welding base plate;

[0024] The six cylinders A are divided into three groups, with two in each group; the cylinders A are distributed in sequence along the length direction of the mounting base, and each group of cylinders A is relatively distributed on the outside of two high-precision linear guide rails, and the bases of the cylinders A are vertically fixed on the mounting base;

[0025] The pressing plate B is horizontally arranged above the welding base plate, and its length direction is consistent with the length direction of the mounting base, and three rectangular holes are sequentially opened in the central area along the length direction, and the lower end surfaces of the two ends in the width direction are respectively fixedly connected to the piston rod ends of the six cylinders A;

[0026] The size of the tempered glass is matched with the size of the rectangular hole, and three pieces of tempered glass are respectively installed in the three rectangular holes.

[0027] Furthermore, in order to facilitate the installation and disassembly of the high-precision linear guide rail, multiple pairs of threaded holes A and multiple pairs of threaded holes B are opened on the installation base along the length direction, and each pair of threaded holes A and each pair of threaded holes B are symmetrically distributed in the width direction.

[0028] In order to facilitate manual movement of the base plate, a handle A is also included, and the handle A is fixedly installed at the left end of the base plate.

[0029] As a preferred embodiment, the workpiece support plate is made of black anodized aluminum plate.

[0030] Furthermore, in order to better cooperate with the pressing plate A to press the plastic part to be welded onto the workpiece welding base plate, the workpiece positioning block A and the workpiece positioning block B are made of ABS plastic plate.

[0031] As a preferred embodiment, the outer contour of the pressure plate B is a rectangle, and it is connected to the piston rod end of the cylinder A by fixing screws; two U-shaped grooves are provided at both ends of the pressure plate B in the length direction at positions corresponding to the two pressure plates A.

[0032] Furthermore, in order to avoid the tempered glass from being damaged during the pressing process of the pressing plate B, the four sides of the tempered glass are fixedly installed in the rectangular hole by 1 mm thick silicone pads.

[0033] Furthermore, in order to facilitate the carrying of the entire clamp, two handles B are also included. The two handles B are relatively fixedly connected to the end edges of both sides of the mounting base in the width direction.

[0034] As a preferred embodiment, the hardness of the silicone pad is 10°, the thickness is 10mm, and two lower mounting holes with a diameter of 3mm are provided at both ends in the length direction at positions corresponding to the two spring locating pins A; the material of the welding base plate is black anodized aluminum plate, the thickness is 0.5mm, and two upper mounting holes with a diameter of 3mm are provided at both ends in the length direction at positions corresponding to the two spring locating pins A.

[0035] Furthermore, in order to effectively protect the tempered glass, three rectangular holes correspond to the tops of the three groups of cylinders A respectively.

[0036] In the present invention, two positioning blocks A and two positioning blocks B are respectively installed on the outer sides of the left and right ends of the two high-precision linear guides, so that a limiting structure can be formed at the left and right ends of the two high-precision linear guides, so that the slider A can be prevented from slipping off the high-precision linear guides; in addition, the two positioning blocks A can also limit the maximum stroke of the left side of the bottom plate during the horizontal movement after contacting with the slider A, which is conducive to quickly locating the first point loading and unloading position. At the same time, the two positioning blocks B can also limit the maximum stroke of the right side of the bottom plate during the horizontal movement after contacting with the slider A, which is conducive to quickly locating the second point first part welding position; installing the slider A on the high-precision linear guide, and then using the bottom plate adapter to install the bottom plate on the slider A, so that the bottom plate can slide smoothly along the length direction of the mounting base, so that the subsequent plastic parts to be welded have the degree of freedom in the X-axis direction. Two cylinders B are installed oppositely at the left and right ends of the base plate, and two pressure plates A are connected oppositely to the piston rod ends of the two cylinders B, so that the two pressure plates A can be driven by the two cylinders B to move vertically, thereby realizing the pressing and loosening of the plastic parts to be welded. The workpiece support plate is installed above the base plate through the heightening plate, and the heightening plate can be used to lift the workpiece support plate above the cylinder barrel of the cylinder B. In this way, when the plastic parts to be welded are set above the workpiece support plate, it can be ensured that the cylinder B can act on the plastic parts to be welded during the process of driving the pressure plate A; the welding base plate is connected to the workpiece support plate through the silicone pad, which can ensure that the plastic parts to be welded have a certain elastic buffering range after being placed on the welding base plate. In this way, when the pressure plate A presses on the end of the plastic parts to be welded, it can ensure that the middle section of the plastic parts to be welded can have a good fit with the welding base plate. Workpiece positioning blocks A and B are installed at both ends of the workpiece support plate relative to the outside of the silicone pad and the welding base plate, which can ensure that after the two ends of the plastic parts to be welded are overlapped on the workpiece positioning blocks A and B, the two pressure plates A can be used to stably press the two ends of the plastic parts to be welded on the workpiece positioning blocks A and B. The six cylinders A fixedly installed on the mounting base are used to support the pressure plate B above the welding base plate, which can facilitate the use of the synchronous telescopic action of the six cylinders A to drive the pressure plate B to move vertically, so that the middle section of the plastic parts to be welded can be stably pressed on the surface of the welding base plate after a certain distance of downward movement, which is conducive to ensuring the stability of the welding process. Three rectangular holes are opened in the length direction of the pressure plate B, and tempered glass is installed in the rectangular holes, which can not only use the hardness of the tempered glass to ensure the pressing effect of the workpiece to be welded, but also facilitate the laser to pass through and act on the plastic parts to be welded. Two spring positioning pins A are arranged on the workpiece support plate, which can facilitate the positioning of the plastic parts to be welded placed on the welding base plate, thereby ensuring the accuracy of the placement position of the plastic parts to be welded and effectively ensuring the welding quality.Install a spring locating pin B with 45° on both sides of the upper end on the mounting base. At the same time, fix the stopper A and the slide rail on the lower end surface of the bottom plate, and slide the stopper B on the slide rail. At the same time, make the left side of the lower end of the stopper A 45° and the right side 90°. In this way, when the spring pin of the spring locating pin B abuts the right side of the stopper A, the second part of the welding position of the third point in the rightward lateral movement of the bottom plate can be positioned. Make the lower end of the stopper B lower than the lower end of the stopper A. At the same time, make the left side of the lower end of the stopper B 60° and the right side 45°, so that the bottom plate can smoothly pass through the positions of the stopper B and the stopper A during the first movement to the right, and can reach the position abutting with the locating block B. At the same time, when the bottom plate moves to the left from the position of the positioning block B, it can smoothly pass through the block A and can interact with the left side surface of the lower end of the block B to push the block B away from the block A for a certain distance, so as to generate a space between the blocks A and B for the elastic pin to bounce up. In this way, the bottom plate can be pushed in the reverse direction to achieve the positioning of the third point.

[0037] The present invention has low manufacturing cost, can realize stable clamping of the plastic workpiece to be welded, and can realize three-point positioning of the plastic workpiece to be welded, which can effectively ensure the welding quality. It is suitable for welding of large-sized film-like plastic parts, can compress large-sized film-like plastic workpieces, and is easy to replace after the tempered glass is damaged. For film-like plastic parts, due to their thin characteristics, when the large-sized glass is pressed down, the contact surface of the plastic workpiece cannot be fully contacted, and the large-sized tempered glass is damaged due to debugging and processing and needs to be replaced at a high cost. The use of this solution can effectively solve the welding clamping problem of film-like plastic parts and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional structural diagram of the present invention in an unclamped state;

[0039] Figure 2 It is a left side view of the present invention in an unclamped state;

[0040] Figure 3 is a front view of the present invention in an unclamped state;

[0041] Figure 4 This is a three-dimensional structural diagram of the present invention in a clamped state;

[0042] Figure 5 It is a left side view of the present invention in a clamped state;

[0043] Figure 6 is a front view of the present invention in a clamped state;

[0044] Figure 7 The explosion of the present invention Figure 1 ;

[0045] Figure 8 The explosion of the present invention Figure 2 ;

[0046] Fig. 9 It is the first point of three-point positioning for loading and unloading;

[0047] Fig.10 It is three-point positioning of the second point and the first part of the welding position;

[0048] Fig.11 It is the three-point positioning third point and second part welding position.

[0049] In the figure: 1. Pressing plate B, 2. Tempered glass, 3. Fixing screw, 4. Handle A, 5. High-precision linear guide, 6. Positioning block A, 7. Cylinder B, 8. Pressing plate A, 9. Mounting base, 10. Handle B, 11. Cylinder A, 12. Spring locating pin B, 13. Bottom plate adapter, 14. Positioning block B, 15. Slider A, 16. Heightening plate, 17. Spring locating pin A, 18. Welding bottom plate, 19. Silicone pad, 20. Workpiece positioning block A, 21. Workpiece support plate, 22. Slide rail, 23. Block A, 24. Block B, 25. Bottom plate, 26. Workpiece positioning block B. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] like Figures 1 to 11 As shown, the present invention provides a plastic laser welding fixture with three-point positioning, including a mounting base 9, a high-precision linear guide 5, a positioning block A6, a positioning block B14, a spring positioning pin B12, a slider A15, a base plate adapter 13, a base plate 25, a stopper A23, a slide rail 22, a stopper B24, a cylinder B7, a workpiece support plate 21, a pressing plate A8, a workpiece positioning block A20, a workpiece positioning block B26, a silicone pad 19, a welding base plate 18, a spring positioning pin A17, a cylinder A11 and a pressing plate B1 and a tempered glass 2;

[0052] The mounting base 9 is arranged horizontally, and its length direction extends in the left-right direction;

[0053] The length direction of the high-precision linear guide rail 5 is consistent with the length direction of the mounting base 9. The two high-precision linear guide rails 5 are fixedly mounted side by side on the upper end surface of the mounting base 9, and the two are symmetrically distributed along the width direction of the mounting base 9. As a preferred embodiment, the high-precision linear guide rail 5 is a guide rail with a self-lubricating function, so that lubricating oil does not need to be regularly added during use, reducing the maintenance frequency;

[0054] Two positioning blocks A6 are correspondingly distributed on the outer sides of the left ends of the two high-precision linear guide rails 5 and fixedly mounted on the mounting base 9 to limit the maximum limit position of the four sliders A15 moving toward the left end;

[0055] The two positioning blocks B14 are correspondingly distributed on the outer sides of the right ends of the two high-precision linear guide rails 5 and fixedly mounted on the mounting base 9 to limit the maximum limit position of the four sliders A15 moving toward the right end;

[0056] The spring positioning pin B12 is arranged between the two high-precision linear guide rails 5 and is fixedly mounted on the right side of the upper end of the mounting base 9 and is located on the left side of the positioning block B14; as a preferred embodiment, the left and right sides of the upper end of the elastic pin in the spring positioning pin B12 are both inclined at 45°, so as to achieve smooth cooperation with the stopper A23 and the stopper B24 during the sliding process of the bottom plate 25;

[0057] Four pairs of sliders A15 are distributed in sequence along the length direction of the mounting base 9, and each pair of sliders A15 is slidably mounted side by side on two high-precision linear guide rails 5;

[0058] The four pairs of bottom plate adapters 13 correspond to the distribution of the four pairs of sliders A15, and each pair of bottom plate adapters 13 is fixedly installed on the upper end of each pair of sliders A15. At the same time, the two bottom plate adapters 13 on the left side and the two bottom plate adapters 13 on the right side of the same high-precision linear guide rail 5 are fixedly connected by a connecting plate;

[0059] The bottom plate 25 is horizontally arranged above the two high-precision linear guide rails 5, and its lower end is fixedly connected to the upper ends of the four pairs of bottom plate adapters 13 respectively;

[0060] The stopper A23 is a bar-shaped block, the upper end of which is vertically fixedly connected to the lower end surface of the bottom plate 25, the left side of the lower end is a 45° inclined slope structure, and the right side of the lower end is a 90° vertical structure, and the stopper A23 is distributed correspondingly to the spring positioning pin B12;

[0061] The length direction of the slide rail 22 is consistent with the length direction of the mounting base 9; the slide rail 22 is located on the right side of the stopper A23 and is fixedly mounted on the lower end surface of the bottom plate 25, and a slider B is slidably mounted on the slide rail 22;

[0062] The stopper B24 is a bar-shaped block, which is located on the right side of the stopper A23, with its upper end fixedly connected to the slider B, and its lower end lower than the lower end of the stopper A23. At the same time, the left side of its lower end is a 60° inclined surface structure, and the right side of its lower end is a 45° inclined surface structure;

[0063] The two cylinders B7 are relatively distributed on the upper left end and the upper right end of the bottom plate 25. The cylinders B7 are vertically arranged, and their bases are vertically fixedly mounted on the upper end surface of the bottom plate 25.

[0064] The workpiece support plate 21 is horizontally arranged above the bottom plate 25 and is located between the two cylinders B7. At the same time, it is located above the upper end of the cylinder barrel of the cylinder B7. The workpiece support plate 21 is fixedly connected to the bottom plate 25 through a plurality of heightening plates 16.

[0065] The two pressing plates A8 are correspondingly distributed at the upper ends of the two cylinders B7. The two pressing plates A8 are strip-shaped plates. The outer ends of the two pressing plates are respectively fixedly mounted on the piston rod ends of the two cylinders B7, and the inner ends of the two pressing plates approach each other and extend to the inner side above the two ends of the workpiece support plate 21. The two pressing plates A8, driven synchronously by the two cylinders B7, can press the plastic parts to be welded onto the welding base plate 18, thereby avoiding the occurrence of adhesion between the plastic parts and the tempered glass 2 after welding.

[0066] The workpiece positioning block A20 and the workpiece positioning block B26 are relatively fixedly connected to the left and right ends of the upper end surface of the workpiece support plate 21; the arrangement of the workpiece positioning block A20 and the workpiece positioning block B26 can prevent the pressure plate A from not pressing tightly and damaging the workpiece to be welded when pressing down; wherein the upper end surfaces of the workpiece positioning block A20 and the workpiece positioning block B26 are flush;

[0067] The silicone pad 19 is disposed between the workpiece positioning block A20 and the workpiece positioning block B26, and is closely connected to the upper end surface of the work support plate 21; the silicone pad 19 is used to protect the contact layer of the plastic part to be welded so that it can be closely fitted with the welding base plate 18;

[0068] The size of the welding base plate 18 is adapted to the size of the silicone pad 19, and is snugly connected to the silicone pad 19. Preferably, the upper end surface of the welding base plate 18 is flush with the upper end surfaces of the workpiece positioning block A20 and the workpiece positioning block B26; the welding base plate 18 can provide a support base for the plastic parts to be welded, and can prevent the silicone pad 19 from being damaged by the laser.

[0069] The two spring locating pins A17 are relatively distributed at the left and right parts of the upper end of the workpiece support plate 21, and the lower end of the spring locating pin A17 is vertically fixedly connected to the upper end surface of the workpiece support plate 21 after passing through the welding base plate 18 and the silicone pad 19 in sequence, and the height of the upper end in the natural state is higher than the height of the welding base plate 18, and the height in the downward pressure state is not higher than the height of the welding base plate 18; the two spring locating pins A17 are used to locate the placement position of the plastic parts to be welded;

[0070] The six cylinders A11 are divided into three groups, with two in each group; the groups of cylinders A11 are distributed in sequence along the length direction of the mounting base 9, and each group of cylinders A11 is relatively distributed on the outside of the two high-precision linear guide rails 5, and the bases of the cylinders A11 are vertically fixedly mounted on the mounting base 9; the two groups of cylinders A11 are used to drive the pressing plate B1 to move back and forth in the vertical direction through synchronous telescopic actions, so as to realize the pressing and loosening actions of the plastic parts to be welded; as a preferred embodiment, the mounting base 9 is provided with a mounting groove at the position corresponding to the installation of the cylinder A11, so as to ensure that the cylinder A11 can be vertically and stably mounted on the mounting base 9;

[0071] The pressing plate B1 is horizontally arranged above the welding bottom plate 18, and its length direction is consistent with the length direction of the mounting base 9, and three rectangular holes are sequentially opened in the central area along the length direction, and the lower end surfaces of the two ends in the width direction are fixedly connected to the piston rod ends of the six cylinders A11 respectively;

[0072] The size of the tempered glass 2 matches the size of the rectangular hole, and three pieces of tempered glass 2 are installed in the three rectangular holes respectively.

[0073] As a preferred embodiment, the three rectangular holes correspond to the tops of the three groups of cylinders A11, so that each piece of tempered glass 2 can be more evenly stressed during the downward pressing process, thus avoiding the tempered glass 2 from being damaged.

[0074] In order to facilitate the installation and disassembly of the high-precision linear guide rail, the installation base 9 is provided with multiple pairs of threaded holes A and multiple pairs of threaded holes B along the length direction, and each pair of threaded holes A and each pair of threaded holes B are symmetrically distributed in the width direction.

[0075] In order to facilitate manual movement of the base plate, a handle A4 is also included, and the handle A4 is fixedly installed on the left end of the base plate 25.

[0076] As a preferred embodiment, the workpiece support plate 21 is made of black anodized aluminum plate.

[0077] In order to better cooperate with the pressing plate A to press the plastic part to be welded onto the workpiece welding base plate, the workpiece positioning block A20 and the workpiece positioning block B26 are made of ABS plastic plate.

[0078] As a preferred embodiment, the outer contour of the pressing plate B1 is rectangular, and it is connected to the piston rod end of the cylinder A11 by a fixing screw 3; two U-shaped grooves are provided at both ends of the length direction of the pressing plate B1 at positions corresponding to the two pressing plates A8, so that when the pressing plate B1 moves downward, it can avoid interference with the two pressing plates A8. As a preferred embodiment, in order to ensure the load-bearing capacity, the pressing plate B1 is made of steel plate;

[0079] In order to avoid the tempered glass 2 from being damaged during the pressing process of the pressing plate B1, the four sides of the tempered glass 2 are fixed in the rectangular hole by a 1 mm thick silicone pad.

[0080] In order to facilitate the carrying of the entire clamp, two handles B10 are also included. The two handles B10 are relatively fixedly connected to the two side edges of the mounting base 9 in the width direction.

[0081] As a preferred embodiment, the hardness of the silicone pad 19 is 10°, the thickness is 10 mm, and two lower mounting holes with a diameter of 3 mm are provided at both ends in the length direction at positions corresponding to the two spring locating pins A17; the material of the welding base plate 18 is black anodized aluminum plate, the thickness is 0.5 mm, and two upper mounting holes with a diameter of 3 mm are provided at both ends in the length direction at positions corresponding to the two spring locating pins A17.

[0082] Here’s how to use it:

[0083] Step 1: Pull the bottom plate 25 out to the position of the positioning block A6 through the handle A4. This position is the first loading and unloading position. Place the plastic workpiece to be welded on the upper part of the welding bottom plate 18. The circular holes reserved on both sides of the plastic workpiece to be welded are positioned with the elastic pins of the two spring positioning pins A17. Synchronously control the actions of the two cylinders B7 so that the high-pressure gas output by the high-pressure gas source enters the rod chambers of the two cylinders B7, driving the piston rods of the two cylinders B7 to retract synchronously, and synchronously drive the two pressing plates A8 to move downward until the two ends of the plastic workpiece to be welded are pressed tightly against the positioning workpiece positioning block A20 and the workpiece positioning block B26. In this process, the middle section of the plastic workpiece to be welded is tightly fitted with the welding bottom plate 18;

[0084] Step 2: Push the bottom plate 25 to the welding position of the first part of the second point through the handle A4. The bottom plate 25 moves horizontally to the right along the high-precision linear guide rail 5 through the four sliders A15. When it moves to the position of the spring positioning pin B12, the block B24 overlaps the left side of the spring positioning pin B12 by 45 degrees through the right side inclined surface. The horizontal force becomes a vertical force, so that the spring positioning pin B12 is pressed down, and the bottom plate 25 continues to move. After moving past the block B24, because the distance between the block A23 and the block B24 is almost 0, the spring positioning pin B12 always keeps pressing down, and the bottom plate 25 continues to move. When it moves to the position where it is restricted by the positioning block B14, this position is the welding position of the first part of the second point.

[0085] Step 3: After reaching the welding position of the first part of the second point, control the six cylinders A11 to move synchronously, so that the high-pressure gas output by the high-pressure gas source enters the rod chamber of the six cylinders A11, drives the piston rods of the six cylinders A11 to shrink synchronously, and drives the pressing plate B1 to move toward the mounting base 9, directly pressing the plastic workpiece to be welded and then starting the welding operation. After welding, synchronously control the piston rods of the six cylinders A11 to extend synchronously, and separate the pressing plate B1 from the state of contact with the plastic workpiece to be welded. At this time, move to the welding position of the second part of the third point, and pull the bottom plate 25 back in the opposite direction through the handle A4. Because the left side of the stopper A23 is a 45° inclined surface, it is positioned with the spring. The 45° inclined surfaces of the pin B12 overlap, and the horizontal force becomes a vertical force, so that the spring positioning pin B12 is pressed down, and the bottom plate 25 continues to move. Because the block B24 is slightly lower than the block A23, and the left side of the block B24 is a 60° inclined surface, when the bottom plate 25 is moved, the slowly rebounding spring positioning pin B12 drives the block B24 to move on the slide rail 22 with friction resistance, and finally the gap between the block A23 and the block B24 becomes larger, and the spring positioning pin B12 is completely lifted. After being lifted, it pushes the bottom plate 25 in the opposite direction to move close to the positioning block B14. At this time, the right side of the block A23 is limited by the spring positioning pin B12, and this position is the welding position of the second part of the third point;

[0086] Step 4: After reaching the welding position of the second part of the third point, synchronously control the six cylinders A11 to retract, so that the high-pressure gas output by the high-pressure gas source enters the rod chamber of the six cylinders A11, and drives the piston rods of the six cylinders A11 to retract synchronously, driving the pressure plate B1 to move in the direction close to the mounting base 9, and directly press the plastic workpiece to be welded and start the welding operation. After welding, synchronously control the piston rods of the six cylinders A11 to extend synchronously, and separate the pressure plate B1 from the contact state with the plastic workpiece to be welded. At this time, use the handle A4 to move the bottom plate 25 to the starting position of the first point, so that the bottom plate 25 moves horizontally to the left along the high-precision linear guide 5 through the four sliders A15. During the movement, it encounters the limit stop of the positioning block A6. This position is the loading and unloading position of the first point.

[0087] In the present invention, two positioning blocks A and two positioning blocks B are respectively installed on the outer sides of the left and right ends of the two high-precision linear guides, so that a limiting structure can be formed at the left and right ends of the two high-precision linear guides, so that the slider A can be prevented from slipping off the high-precision linear guides; in addition, the two positioning blocks A can also limit the maximum stroke of the left side of the bottom plate during the horizontal movement after contacting with the slider A, which is conducive to quickly locating the first point loading and unloading position. At the same time, the two positioning blocks B can also limit the maximum stroke of the right side of the bottom plate during the horizontal movement after contacting with the slider A, which is conducive to quickly locating the second point first part welding position; installing the slider A on the high-precision linear guide, and then using the bottom plate adapter to install the bottom plate on the slider A, so that the bottom plate can slide smoothly along the length direction of the mounting base, so that the subsequent plastic parts to be welded have the degree of freedom in the X-axis direction. Two cylinders B are installed oppositely at the left and right ends of the base plate, and two pressure plates A are connected oppositely to the piston rod ends of the two cylinders B, so that the two pressure plates A can be driven by the two cylinders B to move vertically, thereby realizing the pressing and loosening of the plastic parts to be welded. The workpiece support plate is installed above the base plate through the heightening plate, and the heightening plate can be used to lift the workpiece support plate above the cylinder barrel of the cylinder B. In this way, when the plastic parts to be welded are set above the workpiece support plate, it can be ensured that the cylinder B can act on the plastic parts to be welded during the process of driving the pressure plate A; the welding base plate is connected to the workpiece support plate through the silicone pad, which can ensure that the plastic parts to be welded have a certain elastic buffering range after being placed on the welding base plate. In this way, when the pressure plate A presses on the end of the plastic parts to be welded, it can ensure that the middle section of the plastic parts to be welded can have a good fit with the welding base plate. Workpiece positioning blocks A and B are installed at both ends of the workpiece support plate relative to the outside of the silicone pad and the welding base plate, which can ensure that after the two ends of the plastic parts to be welded are overlapped on the workpiece positioning blocks A and B, the two pressure plates A can be used to stably press the two ends of the plastic parts to be welded on the workpiece positioning blocks A and B. The six cylinders A fixedly installed on the mounting base are used to support the pressure plate B above the welding base plate, which can facilitate the use of the synchronous telescopic action of the six cylinders A to drive the pressure plate B to move vertically, so that the middle section of the plastic parts to be welded can be stably pressed on the surface of the welding base plate after a certain distance of downward movement, which is conducive to ensuring the stability of the welding process. Three rectangular holes are opened in the length direction of the pressure plate B, and tempered glass is installed in the rectangular holes, which can not only use the hardness of the tempered glass to ensure the pressing effect of the workpiece to be welded, but also facilitate the laser to pass through and act on the plastic parts to be welded. Two spring positioning pins A are arranged on the workpiece support plate, which can facilitate the positioning of the plastic parts to be welded placed on the welding base plate, thereby ensuring the accuracy of the placement position of the plastic parts to be welded and effectively ensuring the welding quality.Install a spring locating pin B with 45° on both sides of the upper end on the mounting base. At the same time, fix the stopper A and the slide rail on the lower end surface of the bottom plate, and slide the stopper B on the slide rail. At the same time, make the left side of the lower end of the stopper A 45° and the right side 90°. In this way, when the spring pin of the spring locating pin B abuts the right side of the stopper A, the second part of the welding position of the third point in the rightward lateral movement of the bottom plate can be positioned. Make the lower end of the stopper B lower than the lower end of the stopper A. At the same time, make the left side of the lower end of the stopper B 60° and the right side 45°, so that the bottom plate can smoothly pass through the positions of the stopper B and the stopper A during the first movement to the right, and can reach the position abutting with the locating block B. At the same time, when the bottom plate moves to the left from the position of the positioning block B, it can smoothly pass through the block A and can interact with the left side surface of the lower end of the block B to push the block B away from the block A for a certain distance, so as to generate a space between the blocks A and B for the elastic pin to bounce up. In this way, the bottom plate can be pushed in the reverse direction to achieve the positioning of the third point.

[0088] The present invention has low manufacturing cost, can realize stable clamping of the plastic workpiece to be welded, and can realize three-point positioning of the plastic workpiece to be welded, which can effectively ensure the welding quality. It is suitable for welding of large-sized film-like plastic parts, can compress large-sized film-like plastic workpieces, and is easy to replace after the tempered glass is damaged. For film-like plastic parts, due to their thin characteristics, when the large-sized glass is pressed down, the contact surface of the plastic workpiece cannot be fully contacted, and the large-sized tempered glass is damaged due to debugging and processing and needs to be replaced at a high cost. The use of this solution can effectively solve the welding clamping problem of film-like plastic parts and reduce production costs.

[0089] The structure and implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A plastic laser welding fixture with three-point positioning, comprising a mounting base (9), characterized in that: It also includes a high-precision linear guide rail (5), a positioning block A (6), a positioning block B (14), a spring positioning pin B (12), a slider A (15), a base plate adapter (13), a base plate (25), a stopper A (23), a slide rail (22), a stopper B (24), a cylinder B (7), a workpiece support plate (21), a pressure plate A (8), a workpiece positioning block A (20), a workpiece positioning block B (26), a silicone pad (19), a welding base plate (18), a spring positioning pin A (17), a cylinder A (11), a pressure plate B (1) and a tempered glass (2); The mounting base (9) is arranged horizontally, and its length direction extends in the left-right direction; The length direction of the high-precision linear guide rail (5) is consistent with the length direction of the mounting base (9), and the two high-precision linear guide rails (5) are fixedly mounted side by side on the upper end surface of the mounting base (9), and the two are symmetrically distributed along the width direction of the mounting base (9); The two positioning blocks A (6) are correspondingly distributed on the outer sides of the left ends of the two high-precision linear guide rails (5) and are fixedly mounted on the mounting base (9); The two positioning blocks B (14) are correspondingly distributed on the outer sides of the right ends of the two high-precision linear guide rails (5) and are fixedly mounted on the mounting base (9); The spring positioning pin B (12) is arranged between the two high-precision linear guide rails (5) and is fixedly mounted on the right side of the upper end of the mounting base (9) and is located on the left side of the positioning block B (14); Four pairs of sliders A (15) are distributed in sequence along the length direction of the mounting base (9), and each pair of sliders A (15) is slidably mounted side by side on two high-precision linear guide rails (5); The four pairs of bottom plate adapters (13) correspond to the distribution of the four pairs of sliders A (15), and each pair of bottom plate adapters (13) is fixedly mounted on the upper end of each pair of sliders A (15). At the same time, the two bottom plate adapters (13) on the left side and the two bottom plate adapters (13) on the right side of the same high-precision linear guide rail (5) are fixedly connected by a connecting plate. The bottom plate (25) is horizontally arranged above the two high-precision linear guide rails (5), and the lower end thereof is fixedly connected to the upper ends of the four pairs of bottom plate adapters (13) respectively; The stopper A (23) is a bar-shaped block, the upper end of which is vertically fixedly connected to the lower end surface of the bottom plate (25), the left side of the lower end is a 45° inclined slope structure, and the right side of the lower end is a 90° vertical structure, and the stopper A (23) is distributed correspondingly to the spring positioning pin B (12); The length direction of the slide rail (22) is consistent with the length direction of the mounting base (9); the slide rail (22) is located on the right side of the stopper A (23) and is fixedly mounted on the lower end surface of the bottom plate (25); a slider B is slidably mounted on the slide rail (22); The stopper B (24) is a bar-shaped block, which is located on the right side of the stopper A (23), with its upper end fixedly connected to the slider B, and its lower end lower than the lower end of the stopper A (23). At the same time, the left side of the lower end is a 60° inclined surface structure, and the right side of the lower end is a 45° inclined surface structure; The two cylinders B (7) are relatively distributed on the upper left end and the upper right end of the bottom plate (25). The cylinders B (7) are arranged vertically, and their bases are vertically fixedly mounted on the upper end surface of the bottom plate (25). The workpiece support plate (21) is horizontally arranged above the bottom plate (25) and is located between the two cylinders B (7). At the same time, it is located above the upper end of the cylinder barrel of the cylinder B (7). The workpiece support plate (21) is fixedly connected to the bottom plate (25) through a plurality of heightening plates (16); The two pressing plates A (8) are correspondingly distributed at the upper ends of the two cylinders B (7), and the two pressing plates A (8) are strip-shaped plates, the outer ends of which are respectively fixedly mounted on the piston rod ends of the two cylinders B (7), and the inner ends of which are close to each other and extend to the inner side above the two ends of the workpiece support plate (21); The workpiece positioning block A (20) and the workpiece positioning block B (26) are relatively fixedly connected to the left and right ends of the upper end surface of the workpiece support plate (21); The silica gel pad (19) is arranged between the workpiece positioning block A (20) and the workpiece positioning block B (26), and is closely connected to the upper end surface of the working support plate (21); The size of the welding base plate (18) matches the size of the silicone pad (19), and is snugly connected to the silicone pad (19); Two spring positioning pins A (17) are relatively distributed on the left and right parts of the upper end of the workpiece support plate (21), and the lower end of the spring positioning pin A (17) is vertically fixedly connected to the upper end surface of the workpiece support plate (21) after passing through the welding base plate (18) and the silicone pad (19) in sequence, and the height of the upper end in a natural state is higher than the height of the welding base plate (18), and the height in a downwardly pressed state is not higher than the height of the welding base plate (18); The six cylinders A (11) are divided into three groups, each group having two cylinders; the three groups of cylinders A (11) are sequentially distributed along the length direction of the mounting base (9), and each group of cylinders A (11) is relatively distributed on the outer sides of the two high-precision linear guide rails (5), and the bases of the cylinders A (11) are vertically fixedly mounted on the mounting base (9); The pressing plate B (1) is horizontally arranged above the welding base plate (18), its length direction is consistent with the length direction of the mounting base (9), and its central area is provided with three rectangular holes spaced in sequence along the length direction, and the lower end surfaces of the two ends in the width direction are respectively fixedly connected to the ends of the piston rods of the six cylinders A (11); The size of the tempered glass (2) is matched to the size of the rectangular hole, and three pieces of tempered glass (2) are respectively installed in the three rectangular holes.

2. The plastic laser welding fixture with three-point positioning according to claim 1 is characterized in that: The mounting base (9) is provided with a plurality of pairs of threaded holes A and a plurality of pairs of threaded holes B along the length direction, and each pair of threaded holes A and each pair of threaded holes B are symmetrically distributed in the width direction.

3. A plastic laser welding fixture with three-point positioning according to claim 1 or 2, characterized in that: It also includes a handle A (4), which is fixedly mounted on the left end of the bottom plate (25).

4. The plastic laser welding fixture with three-point positioning according to claim 3 is characterized in that: The workpiece support plate (21) is made of a black anodized aluminum plate.

5. The plastic laser welding fixture with three-point positioning according to claim 4 is characterized in that: The workpiece positioning block A (20) and the workpiece positioning block B (26) are made of ABS plastic plate.

6. The plastic laser welding fixture with three-point positioning according to claim 5, characterized in that: The outer contour of the pressing plate B (1) is rectangular, and it is connected to the piston rod end of the cylinder A (11) by a fixing screw (3); two U-shaped grooves are provided at both ends of the pressing plate B (1) in the length direction at positions corresponding to the two pressing plates A (8).

7. The plastic laser welding fixture with three-point positioning according to claim 6, characterized in that: The four sides of the tempered glass (2) are fixedly mounted in the rectangular hole via a 1 mm thick silicone pad.

8. The plastic laser welding fixture with three-point positioning according to claim 7, characterized in that: It also includes two handles B (10), which are fixedly connected to the two side edges of the mounting base (9) in the width direction.

9. The plastic laser welding fixture with three-point positioning according to claim 8, characterized in that: The hardness of the silicone pad (19) is 10°, the thickness is 10 mm, and two lower mounting holes with a diameter of 3 mm are provided at both ends in the length direction at positions corresponding to the two spring positioning pins A (17); the material of the welding base plate (18) is a black anodized aluminum plate, the thickness is 0.5 mm, and two upper mounting holes with a diameter of 3 mm are provided at both ends in the length direction at positions corresponding to the two spring positioning pins A (17).

10. The plastic laser welding fixture with three-point positioning according to claim 9, characterized in that: The three rectangular holes correspond to the tops of the three groups of cylinders A (11) respectively.

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