A precision positioning type laser etching jig

Abstract

This utility model belongs to the field of laser processing fixture technology, and particularly relates to a precision positioning laser engraving fixture. A precision positioning laser engraving fixture includes a base plate, a vertical plate, a support plate, a material guiding mechanism, a material pulling mechanism, and a positioning mechanism. The material guiding mechanism includes a material guiding plate with a material guiding groove, and a pressure plate with a clearance groove. The material pulling mechanism includes a lower pressure wheel rotatably connected to the vertical plate, a lower pressure cylinder fixedly connected to the vertical plate, an upper pressure wheel driven by the lower pressure cylinder and rotatable, and a driving component for driving the lower pressure wheel to rotate. The positioning mechanism includes a mounting plate, a positioning cylinder mounted on the mounting plate, and a positioning pin driven by the positioning cylinder. The upper and lower pressure wheels can press against the material strip, pulling the material strip under the drive of the driving component. The positioning cylinder drives the positioning pin to insert into the positioning hole of the material strip. This utility model has a simple structure and high repeatability.

Description

Technical Field

[0001] This utility model belongs to the field of laser processing fixture technology, and in particular relates to a precision positioning laser engraving fixture. Background Technology

[0002] Current electroplating small parts strips such as Figure 9 As shown, the strip 1 includes a long strip body 11, with several strip positioning holes 12 evenly distributed on both sides of the strip body 11 along its length. Small parts 13 are formed on the strip body 11 by stamping. In actual production, designated areas of the small parts 13 on the electroplated strip 1 need to be laser-engraved. In this application, the area requiring laser engraving is small; for example, a 0.2mm diameter circular through-hole 15 needs to be laser-engraved within a 0.5mm diameter circular groove 14. This places extremely high requirements on the positioning accuracy of the strip 1.

[0003] Currently, stepper motors are commonly used to pull the material strip. For example, Chinese Utility Model Patent No. CN207593976U discloses a continuous material pulling mechanism for a die-cutting machine, Chinese Utility Model Patent No. CN222554069U discloses an automatic material pulling device for the material strip, and Chinese Utility Model Patent No. CN221247082U discloses a cutting device. The basic principle of the material pulling in these patents is that a material pulling wheel is fixedly sleeved on the output shaft of the stepper motor. Several protrusions are set on the outer circumference of the material pulling wheel according to the spacing of the material strip positioning holes 12. When the material pulling wheel rotates, these protrusions will enter the material strip positioning holes 12 in sequence, thereby driving the material strip forward.

[0004] However, in actual material pulling, the strip is affected by the left and right gaps of the material rail and the pulling speed of the stepper motor. The existing technology, combined with the positioning mechanism, can generally achieve a comprehensive positioning accuracy of about ±0.3mm for the strip. However, when facing the above processing scenario (laser engraving a 0.2mm diameter circular through hole 15 in a 0.5mm diameter circular groove 14), the repeatability of the strip 1 needs to be controlled at a higher precision, such as within ±0.05mm, to ensure that the laser engraving position can be controlled within a minimum range each time. In addition, the pulling wheel in the existing material pulling structure is relatively complex, which also has a certain impact on the pulling accuracy. Therefore, there is an urgent need to design a precision positioning laser fixture with a simple structure and higher repeatability. Utility Model Content

[0005] To address the technical problems existing in the prior art, this application provides a precision positioning laser engraving fixture with a simple structure and high repeatability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A precision positioning laser engraving fixture includes a base plate, a vertical plate mounted on the base, and a support plate fixedly connected to the vertical plate. It also includes... Material guiding mechanism: includes a material guiding plate disposed on the upper end of the support plate, a material guiding groove is provided on the material guiding plate, a pressure plate is disposed on the material guiding plate above the material guiding groove, and the pressure plate is provided with a clearance groove; Material pulling mechanism: includes a lower pressing wheel rotatably connected to an upright plate on one side of the guide plate, a lower pressing cylinder fixedly connected vertically downward on the upright plate, an upper pressing wheel driven by the lower pressing cylinder and rotatable, and a drive assembly that drives the lower pressing wheel to rotate; Positioning mechanism: includes a mounting plate, a positioning cylinder fixedly connected to the mounting plate, and a positioning pin driven by the positioning cylinder; The downward pressing cylinder drives the upper pressing roller to move downward, so that the upper pressing roller and the lower pressing roller press against the material belt, and the material belt is pulled under the drive of the driving component; the positioning cylinder drives the positioning pin to be inserted into the positioning hole of the material belt through the clearance groove.

[0007] Preferably, the upright plate includes an upright plate one disposed below the support plate and an upright plate two disposed below the pressing cylinder. A rotating shaft is rotatably connected to the upright plate two, and the rotating shaft is perpendicular to the conveying direction of the material belt. A fixing plate is horizontally fixedly connected to the upper end face of the upright plate two. The pressing cylinder is vertically fixedly connected to the fixing plate. A pressing frame is disposed on the guide rod of the pressing cylinder. A fixing shaft is fixedly connected to the pressing frame. The fixing shaft is parallel to the rotating shaft. The upper pressing wheel is rotatably sleeved on the fixing shaft. The driving assembly can drive the rotating shaft to rotate.

[0008] Preferably, a sliding sleeve is vertically fixedly embedded in the fixed plate, and a sliding rod is slidably inserted in the sliding sleeve, with the lower end face of the sliding rod fixedly connected to the lower pressure frame.

[0009] Preferably, the drive assembly includes a stepper motor fixedly connected to the upright plate, a main synchronous pulley fixedly sleeved on the output shaft of the stepper motor, a driven synchronous pulley fixedly sleeved on the rotating shaft, and a synchronous belt meshing with the main synchronous pulley and the driven synchronous pulley.

[0010] Preferably, a fastening through hole is provided on the outer circumference of the lower pressure roller, the axis of the fastening through hole is perpendicular to the axis of the rotating shaft, and the fastening bolt is threaded into the fastening hole and abuts against the rotating shaft.

[0011] Preferably, an upper bearing is sleeved on the fixed shaft, the upper pressure wheel is fixedly sleeved on the upper bearing, and a limiting sleeve is sleeved on the fixed shaft on both sides of the upper bearing. A limiting through hole is opened on the limiting sleeve, the axis of the limiting through hole is perpendicular to the axis of the fixed shaft, and the limiting bolt is threaded in the limiting through hole and abuts against the fixed shaft.

[0012] Preferably, a sliding plate is fixedly connected to the guide rod of the positioning cylinder, an adjusting plate is vertically fixedly connected to the outer end face of the sliding plate, a connecting plate is fixedly connected to the lower part of the adjusting plate, and the positioning pin is vertically fixedly embedded in the connecting plate.

[0013] Preferably, a horizontal plate is fixedly connected to the upper surface of the pressure plate near the lower pressure roller, and a photoelectric sensor is vertically embedded in the horizontal plate. A pressure plate through hole and a guide plate hole are respectively opened on the pressure plate and the guide plate below the photoelectric sensor.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This invention features a material pulling mechanism comprising a drive assembly, a lower pressure roller, an upper pressure roller, and a lower pressure cylinder. Compared to the existing technology's stepper motor-driven material pulling roller with a pulling protrusion, this material pulling structure is simpler and more efficient. Furthermore, this simple and efficient material pulling structure, in conjunction with a positioning mechanism including a positioning cylinder and a positioning pin, achieves precise positioning of the material strip, ensuring higher repeatability and achieving the positional accuracy control within ±0.05mm required in the prior art. This guarantees accurate laser engraving each time and improves the yield of the laser engraving station. In addition, this invention is simple to operate, has a low failure rate, is easy to debug, has low maintenance costs, and high production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model when used in conjunction with a laser machine.

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the material guiding mechanism and positioning mechanism of this utility model.

[0018] Figure 4 This is a schematic diagram of the material guiding mechanism of this utility model.

[0019] Figure 5 This is a schematic diagram of the positioning mechanism of this utility model.

[0020] Figure 6 This is a three-dimensional structural diagram of the material pulling mechanism of this utility model.

[0021] Figure 7 This is a side view of the material pulling mechanism of this utility model.

[0022] Figure 8 This is a schematic diagram of the structure of this utility model when used in conjunction with a laser machine, a feeding assembly, and a receiving assembly.

[0023] Figure 9 This is a schematic diagram of the existing material strip structure.

[0024] In the diagram: 1. Material strip; 11. Material strip body; 12. Material strip positioning hole; 13. Small part; 14. Circular groove; 15. Circular through hole. 2. Laser engraving fixture, 21. Bottom plate, 22. Vertical plate; 221. Vertical plate one; 222. Vertical plate two; 223. Fixed plate; 224. Sliding sleeve; 225. Sliding rod. 23. Support plate 24. Material guiding mechanism; 241. Material guiding plate; 2411. Material guiding chute; 2412. Material dropping chute; 242. Pressure plate; 2421. Clearance groove; 243. Horizontal plate; 244. Photoelectric sensor. 25. Material pulling mechanism; 251. Rotating shaft; 252. Lower bearing; 253. Stepper motor; 254. Main synchronous pulley; 255. Slave synchronous pulley; 256. Synchronous belt; 257. Lower pressure roller; 2571. Fastening through hole; 2572. Fastening bolt; 258. Lower pressure cylinder; 259. Lower pressure frame; 2591. Fixed shaft; 2592. Upper bearing; 2593. Limit sleeve; 2594. Limiting through hole; 2695. Limiting bolt; 260. Upper pressure roller. 26. Positioning mechanism; 261. Mounting plate; 262. Positioning cylinder; 263. Slide plate; 264. Adjusting plate; 265. Connecting plate; 266. Positioning pin. 3. Workbench, 4. Control display, 5. Laser machine, 6. Material guide rack, 7. Material feeding assembly, 8. Material receiving assembly. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example

[0027] See appendix Figure 1 As shown, a precision positioning laser engraving fixture, referred to as laser engraving fixture 2 in this embodiment for ease of explanation, is depicted. This laser engraving fixture 2 is placed on a worktable 3. Furthermore, a control display 4 is also provided on the worktable 3. A laser machine 5 is located on one side of the laser engraving fixture 2, and a guide frame 6 is provided at the material inlet of the laser engraving fixture 2. It should be noted that the worktable 3, control display 4, laser machine 5, and guide frame 6 are all existing technologies, used only to describe the application scenario of this laser engraving fixture 2.

[0028] See Figure 2 As shown, the laser engraving fixture 2 includes a base plate 21, a vertical plate 22 disposed on the base plate 21, and a support plate 23 fixedly connected to the vertical plate 22. In addition, it also includes a guiding mechanism 24 for guiding the material strip 1, a pulling mechanism 25 for pulling the material strip 1, and a positioning mechanism 26 for positioning the material strip 1.

[0029] Specifically, the base plate 21 is horizontally fixed to the upper surface of the workbench 3 by bolts. The upright plate 22 includes an upright plate 221 that is vertically fixed to the top of the base plate 21 by bolts, and an upright plate 222 that is disposed on one side of the upright plate 221. The upright plate 221 and the upright plate 222 are integrally formed, and the upright plate 222 is higher than the upright plate 221. Thus, the upright plate 221 and the upright plate 222 form an L-shaped structure, and two sets of the upright plate 221 and the upright plate 222 are arranged relatively parallel to each other. Support plates 23 are horizontally fixed to the upper surfaces of the two upright plates 221 by bolts, and fixing plates 223 are horizontally fixed to the upper surfaces of the two upright plates 222 by bolts.

[0030] See Figure 3 , 4 As shown, the material guiding mechanism 24 includes a material guiding plate 241, a pressure plate 242, a horizontal plate 243, and a photoelectric sensor 244.

[0031] The guide plate 241 is a plate-shaped structure and is fixedly connected to the upper surface of the support plate 23 along its length. A guide groove 2411 is formed on the guide plate 241 along its length. Two pressure plates 242 are fixedly connected to the guide plate 241 on both sides above the guide groove 2411 by bolts. The inner end face of the pressure plate 242 extends above the guide groove 2411. The width and depth of the guide groove 2411 match the size of the material strip 1, that is, the material strip 1 is embedded in the guide space enclosed by the guide groove 2411 and the pressure plate 242 and is pulled by the pulling mechanism 25.

[0032] After the circular through hole 15 is cut, there will be material dropping. In order to avoid the material dropping affecting the cutting of the circular through hole 15, a material dropping groove 2412 is provided along the length of the bottom of the guide groove 2411. The material dropping groove 2412 is located below the circular through hole 15. Since the circular through hole 15 is small, its material dropping size is also small. Therefore, the material dropping groove 2412 can be a groove that does not penetrate the guide plate 241. Of course, the material dropping groove 2412 can also be a through groove that penetrates the guide plate 241. A through groove also needs to be provided on the support plate 23 below the material dropping groove 2412 so that the material drops to the bottom of the support plate 23.

[0033] Two clearance grooves 2421 are provided on the inner end face of the pressure plate 242 on one side. The distance between the two clearance grooves 2421 is the same as the distance between a number of strip positioning holes 12. In this embodiment, the distance between the centers of the two clearance grooves 2421 is the same as the distance between the centers of two strip positioning holes 12 that are spaced four consecutive strip positioning holes 12.

[0034] During the pulling process of the material strip 1, in order to identify the length of the material strip 1 pulled, a horizontal plate 243 is fixedly connected to the pressure plate 242 on the other side by bolts. A photoelectric sensor 244 is vertically fixedly inserted in the horizontal plate 243. The pressure plate 242 and the guide plate 241 below the photoelectric sensor 244 are respectively provided with pressure plate through holes and guide plate holes (not shown in the figure). When the material strip 1 moves to the point where the material strip positioning hole 12 is aligned with the pressure plate through hole and the guide plate hole, the light signal of the photoelectric sensor 244 is not blocked. When the material strip positioning hole 12 is not aligned with the pressure plate through hole and the guide plate hole, the light signal of the photoelectric sensor 244 is blocked. The photoelectric sensor 244 sends the unblocked signal to the existing controller and control display 4 to calculate and identify the pulling length of the material strip 1.

[0035] See Figure 3 , 5 As shown, the positioning mechanism 26 is mounted on the support plate 23 on one side of the guiding mechanism 24. The positioning mechanism 26 includes a mounting plate 261 vertically fixed to the upper end face of the support plate 23 by bolts, and a positioning cylinder 262 vertically fixed downwards to the mounting plate 261 by bolts. An L-shaped sliding plate 263 is fixedly connected to the guide rod of the positioning cylinder 262 by an existing floating joint. The horizontal end face of the sliding plate 263 is fixedly connected to the guide rod of the positioning cylinder 262. An adjusting plate 264 is vertically fixed to the outer side of the vertical end face of the sliding plate 263. Connecting holes of different heights are provided on the vertical end face of the sliding plate 263. The height of the adjusting plate 264 is adjusted by bolting into the connecting holes of different heights. A connecting plate 265 is vertically fixed to the lower part of the adjusting plate 264 by bolts, and a positioning pin 266 is vertically fixedly embedded in the connecting plate 265.

[0036] The distance between the axes of the two positioning pins 266 is the same as the distance between the centers of the two clearance grooves 2421. That is, under the drive of the positioning cylinder 262, the two positioning pins 266 can be inserted into the two clearance grooves 2421 and the two material strip positioning holes 12 in sequence. The outer diameter of the two positioning pins 266 is the same as the inner diameter of the material strip positioning hole 12. The lower end of the two positioning pins 266 is a conical structure. When the positioning pins 266 are inserted into the material strip positioning hole 12, the material strip 1 is positioned.

[0037] See Figure 6 , 7 As shown, the feeding mechanism 25 includes a rotating shaft 251 rotatably connected to a vertical plate 222 on one side of the guide plate 241. The rotating shaft 251 is arranged perpendicular to the vertical plate 222, that is, the rotating shaft is perpendicular to the conveying direction of the material belt. Lower bearings 252 are fixedly embedded in the two vertical plates 222 respectively, and the two ends of the rotating shaft 251 are fixedly inserted into the inner rings of the two lower bearings 252 respectively.

[0038] Two lower pressure rollers 257 are fixedly sleeved on the rotating shaft 251. In order to facilitate the installation of the lower pressure rollers 257 and the adjustment of their position on the rotating shaft 251, a fastening through hole 2571 is provided on the outer circumference of the lower pressure rollers 257. The axis of the fastening through hole 2571 is perpendicular to the axis of the rotating shaft 251. The fastening bolt 2572 is threaded into the fastening through hole 2571 and abuts against the rotating shaft 251.

[0039] The rotating shaft 251 can be driven to rotate by a drive assembly, which includes a stepper motor 253 fixedly connected to the first vertical plate 221 by bolts, a main synchronous pulley 254 fixedly sleeved on the output shaft of the stepper motor 253, a driven synchronous pulley 255 fixedly sleeved on the rotating shaft 221 extending to the outside of the second vertical plate 222, and a synchronous belt 256 meshing with the stepper motor 254 and the stepper motor 255. The drive assembly and its drive to rotate the rotating shaft 251 are both prior art, that is, the stepper motor 253 drives the main synchronous pulley 254 to rotate, thereby driving the synchronous belt 256, the driven synchronous pulley 255, the rotating shaft 251, and the lower pressure roller 257 to rotate.

[0040] The downward pressing cylinder 258 is vertically fixed to the upper end face of the fixed plate 223 by bolts. The guide rod of the downward pressing cylinder 258 can slide through the fixed plate 223 and extend to the bottom of the fixed plate 223. An inverted U-shaped pressing frame 259 is provided on the guide rod of the downward pressing cylinder 258 below the fixed plate 223. The guide rod of the downward pressing cylinder 258 is fixedly connected to the horizontal end face of the pressing frame 259 through a floating joint. Fixed shafts 2591 are horizontally fixedly connected to the two vertical end faces of the pressing frame 259. The fixed shafts 2591 are set parallel to the rotating shaft 251. Two upper bearings 2592 are fixedly sleeved on the fixed shaft 2591. The upper pressure roller 260 is fixedly sleeved on the outer ring of the upper bearings 2592. In order to limit the two upper bearings 2592 and facilitate the adjustment of the position of the upper pressure roller 260 on the fixed shaft 2591, limiting sleeves 2593 are sleeved on the fixed shaft 2591 on the left and right sides of the upper bearings 2592. Limiting through holes 2594 are opened on the limiting sleeves 2593. The axis of the limiting through holes 2594 is perpendicular to the axis of the fixed shaft 2591. The limiting bolts 2595 are threaded into the limiting through holes 2594 and abut against the fixed shaft 2591. Two upper pressure rollers 260 are respectively arranged opposite to two lower pressure rollers 257. When the guide rod of the lower pressure cylinder 258 extends to drive the upper pressure rollers 260 to move downward, the upper pressure rollers 260 and the lower pressure rollers 257 can press against the material belt 1. Under the drive of the drive assembly, the lower pressure rollers 257 rotate, and the material belt 1 is pulled by the friction between the lower pressure rollers 257, the upper pressure rollers 260 and the material belt 1.

[0041] Furthermore, in order to guide the lower pressure frame 259 when it moves, in this embodiment, a sliding sleeve 224 is vertically fixedly embedded in the fixed plate 223, and a sliding rod 225 is slidably inserted in the sliding sleeve 224. The lower end face of the sliding rod 225 is fixedly connected to the horizontal end face of the lower pressure frame 259 by bolts.

[0042] The working principle and process of this embodiment are as follows: See Figure 8 As shown, the laser engraving fixture 2 is fixedly installed on the workbench 3. An existing material guide 6 is set at the feeding end on the right side of the laser engraving fixture 2. An existing material feeding component 7 is placed on the right side of the material guide 6. An existing laser machine 5 and a control display 4 are installed on the workbench 3 on one side of the laser engraving fixture 2. An existing material receiving component 8 is placed on the left side of the workbench 3. 1. The material strip 1 is fed from the feeding assembly 7 through the guide frame 6 and the guide groove 2411 into the space between the upper pressure roller 260 and the lower pressure roller 257. The guide rod of the lower pressure cylinder 258 extends to drive the lower pressure frame 259 and the upper pressure roller 260 to move down so that both the upper pressure roller 260 and the lower pressure roller 257 press against the material strip 1. The stepper motor 253 drives the rotating shaft 251 to rotate, which in turn drives the lower pressure roller 257 to rotate, thereby pulling the material strip 1. The photoelectric sensor 244 is activated. When the material strip positioning hole 12 is detected for the first time, the initial pulling position of the material strip 1 is positioned (i.e., the photoelectric sensor 244 does not block the first time). 2. Stepper motor 253 stops rotating, guide rod of pressing cylinder 258 retracts to disengage upper pressing roller 260 from material strip 1, guide rod of positioning cylinder 262 extends to drive slide plate 263, adjusting plate 264, connecting plate 265, and positioning pin 266 to move downward, so that positioning pin 266 enters the corresponding material strip positioning hole 12 through the corresponding clearance groove 2421, thereby achieving positioning of material strip 1; laser machine starts to achieve laser cutting of circular through hole 15 in circular groove 14 on small part product 13; 3. After the circular through hole 15 is laser-cut, the guide rod of the pressing cylinder 258 extends to drive the pressing frame 259 and the upper pressing roller 260 to move down so that the upper pressing roller 260 and the lower pressing roller 257 are both pressed against the material strip 1. The guide rod of the positioning cylinder 262 retracts so that the positioning pin 266 disengages from the material strip positioning hole 12. Then the stepper motor 253 drives the lower pressing roller 257 to rotate, thereby pulling the material strip 1 forward a certain distance until the photoelectric sensor 244 is no longer blocked. After that, the next material strip positioning hole 12 is identified, and the above step 2 is repeated. The positioning and laser cutting of the entire material strip 1 can be achieved by repeating the cycle. It should be noted that the material strip 1 after laser cutting is wound up by the take-up assembly 8.

[0043] It should be noted that this utility model also involves existing control devices. The connection method and control principle of the control device and its components are existing technologies. Anything not described in this specification is existing technology and will not be elaborated here. As long as the above working process can be met, it is acceptable.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision positioning laser engraving fixture, comprising a base plate, a vertical plate disposed on the base plate, and a support plate fixedly connected to the vertical plate, characterized in that: It also includes, Material guiding mechanism: includes a material guiding plate disposed on the upper end of the support plate, a material guiding groove is provided on the material guiding plate, a pressure plate is disposed on the material guiding plate above the material guiding groove, and the pressure plate is provided with a clearance groove; Material pulling mechanism: includes a lower pressing wheel rotatably connected to an upright plate on one side of the guide plate, a lower pressing cylinder fixedly connected vertically downward on the upright plate, an upper pressing wheel driven by the lower pressing cylinder and rotatable, and a drive assembly that drives the lower pressing wheel to rotate; Positioning mechanism: includes a mounting plate, a positioning cylinder fixedly connected to the mounting plate, and a positioning pin driven by the positioning cylinder; The downward pressing cylinder drives the upper pressing roller to move downward, so that the upper pressing roller and the lower pressing roller press against the material belt, and the material belt is pulled under the drive of the driving component; the positioning cylinder drives the positioning pin to be inserted into the positioning hole of the material belt through the clearance groove.

2. The precision positioning laser engraving fixture according to claim 1, characterized in that: The upright plate includes an upright plate one disposed below the support plate and an upright plate two disposed below the pressing cylinder. A rotating shaft is rotatably connected to the upright plate two, and the rotating shaft is perpendicular to the conveying direction of the material belt. A fixing plate is horizontally fixedly connected to the upper end face of the upright plate two. The pressing cylinder is vertically fixedly connected to the fixing plate. A pressing frame is disposed on the guide rod of the pressing cylinder. A fixing shaft is fixedly connected to the pressing frame. The fixing shaft is parallel to the rotating shaft. The upper pressing wheel is rotatably sleeved on the fixing shaft. The driving assembly can drive the rotating shaft to rotate.

3. The precision positioning laser engraving fixture according to claim 2, characterized in that: A sliding sleeve is vertically fixedly embedded in the fixed plate, and a sliding rod is slidably inserted through the sliding sleeve. The lower end face of the sliding rod is fixedly connected to the lower pressure frame.

4. The precision positioning laser engraving fixture according to claim 2, characterized in that: The drive assembly includes a stepper motor fixedly connected to the upright plate, a main synchronous pulley fixedly sleeved on the output shaft of the stepper motor, a driven synchronous pulley fixedly sleeved on the rotating shaft, and a synchronous belt meshing with the main synchronous pulley and the driven synchronous pulley.

5. The precision positioning laser engraving fixture according to claim 2, characterized in that: A fastening through hole is provided on the outer circumference of the lower pressure roller. The axis of the fastening through hole is perpendicular to the axis of the rotating shaft. The fastening bolt is threaded into the fastening through hole and abuts against the rotating shaft.

6. The precision positioning laser engraving fixture according to claim 2, characterized in that: An upper bearing is fitted onto the fixed shaft, and the upper pressure wheel is fixedly fitted onto the upper bearing. Limiting sleeves are fitted onto the fixed shafts on the left and right sides of the upper bearing. Limiting through holes are opened on the limiting sleeves. The axis of the limiting through holes is perpendicular to the axis of the fixed shaft. Limiting bolts are threaded into the limiting through holes and abut against the fixed shaft.

7. The precision positioning laser engraving fixture according to claim 1, characterized in that: A sliding plate is fixedly connected to the guide rod of the positioning cylinder, an adjusting plate is vertically fixedly connected to the outer end face of the sliding plate, a connecting plate is fixedly connected to the lower part of the adjusting plate, and the positioning pin is vertically fixedly embedded in the connecting plate.

8. The precision positioning laser engraving fixture according to claim 1, characterized in that: A horizontal plate is fixedly connected to the upper surface of the pressure plate near the lower pressure roller. A photoelectric sensor is vertically embedded in the horizontal plate. Pressure plate through holes and guide plate holes are respectively opened on the pressure plate and guide plate below the photoelectric sensor.

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