An electrically operated shielding lifting structure and marking machine

Abstract

This application discloses an electrically operated shielding lifting structure and a marking machine in the field of laser processing equipment technology. The electrically operated shielding lifting structure includes a lifting housing body, a shielding structure inside the lifting housing body, a lifting structure, and a connecting plate outside the lifting housing body. The front surface of the lifting housing body is provided with a vertically oriented hollow groove. The shielding structure includes a strip curtain, a strip curtain support structure, and a connecting plate fixing structure fixed to the strip curtain. The connecting plate fixing structure reciprocates within the lifting housing body under the drive of the lifting structure. The connecting plate fixing structure is fixedly connected to the connecting plate outside the hollow groove. The end of the strip curtain is supported on the strip curtain support structure. When the connecting plate fixing structure reciprocates within the hollow groove, the strip curtain reciprocates under the support of the strip curtain support structure and shields the hollow groove. This solution solves the spatial structure and wiring problems of the prior art, achieving the beneficial effects of reducing volume and facilitating wiring.

Description

Technical Field

[0001] This application relates to the field of laser processing equipment technology, specifically to an electrically operated shielding lifting structure and a marking machine. Background Technology

[0002] Currently, the shielding lifting structure of laser marking machines on the market can be broadly divided into two categories:

[0003] One type is the open type, where the lifting connection or both sides are exposed and hollow, allowing the interior to be seen directly from the outside. The structure is simple, but prolonged exposure to the outside makes it easy for dust and foreign objects to enter and cause damage to the lifting components.

[0004] One type is the dustproof type, which uses a bellows-style telescopic cover or a thin metal sheet to shield against dust. For example, patent document CN220093470U discloses a fiber laser marking machine where the upper and lower ends of the lifting base are connected to bellows covers. The bellows covers slide against the inner wall of the movable opening, effectively separating the inside of the machine frame from the worktable and preventing laser processing debris from entering the frame, affecting its cleanliness and normal operation. The bellows-style telescopic cover utilizes its telescopic property to expand and contract during lifting; the thin metal sheet mainly uses direct shielding or the metal sheet remains stationary while the lifting structure slides within it for shielding. Disadvantages: It requires a large structural space, the shielding components cannot move with the machine, and it is inconvenient for fiber optic cable routing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides an electrically operated shielding lifting structure and a marking machine, thereby solving the problem that the shielding structure in the prior art cannot move with the laser head, making it inconvenient for wire routing.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] An electrically operated, shielding lifting structure includes a lifting housing body, a shielding structure inside the lifting housing body, and a connecting plate outside the lifting housing body. The front surface of the lifting housing body has a vertically oriented perforated groove. The lifting structure is further comprising a lifting structure. The shielding structure includes a strip curtain, a strip curtain support structure, and a connecting plate fixing structure fixed to the strip curtain. The connecting plate fixing structure reciprocates within the lifting housing body under the drive of the lifting structure. The connecting plate fixing structure is fixedly connected to the connecting plate outside the perforated groove. The end of the strip curtain is supported on the strip curtain support structure. When the connecting plate fixing structure reciprocates within the perforated groove, the strip curtain reciprocates under the support of the strip curtain support structure and shields the perforated groove.

[0008] Preferably, the connecting plate fixing structure includes a fixing block and a transition plate, the strip curtain is fixed between the fixing block and the transition plate, and the connecting plate is fixed in front of the transition plate.

[0009] Preferably, the strip curtain uses a soft belt, and the upper and lower ends of the strip curtain are supported on a strip curtain support structure. The strip curtain support structure uses a roller structure including rollers. The soft belt is an annular closed belt. The soft belt and the rollers on both sides, which serve as pulleys, form a flat belt for parallel transmission. The soft belt uses a tensioning structure to provide tension.

[0010] Preferably, the soft strap material is made of leather to form a belt.

[0011] Preferably, the lifting structure uses a stepper motor screw lifting structure, which includes a stepper motor, a screw, a nut seat, and a guide shaft. The stepper motor shaft is vertically mounted inside the lifting housing body. The screw is vertically mounted on the stepper motor shaft and rotates under the driving force of the stepper motor shaft. The nut seat is threadedly connected to the screw and is driven to lift and lower when the screw rotates. The nut seat is fixedly connected to the connecting plate fixing structure. The guide shaft is fixed to the lifting housing body from both sides of the screw, parallel to the screw. The guide shaft passes through the nut seat and slides within the oil-free bushing installed on the nut seat.

[0012] Preferably, the roller structure further includes bearings and locking screws. The roller structure is laterally fixed inside the lifting housing body by sheet metal brackets. Two pairs of sheet metal brackets are laterally fixed to the upper and lower ends of the strip curtain inside the lifting housing body. The locking screws are fixed between the front ends of each pair of sheet metal brackets. The roller is rotatably fixed to the locking screws by bearings at both ends. The roller has roller slots at both ends, facing outwards towards the inner side of the strip curtain. The two sides of the strip curtain are engaged in the roller slots.

[0013] Preferably, the roller is made of nylon.

[0014] Preferably, the tensioning structure uses a spring-type tensioning structure, which includes a spring tensioning sheet metal frame, a spring, a spring fixing block, and a spring moving rod. The spring fixing block is fixed to the rear side of the belt inside the lifting housing body. A spring groove is provided in the spring fixing block. One end of the spring is installed in the spring groove. The spring moving rod passes through the spring in the spring groove from the rear side of the spring fixing block and is fixedly connected to the spring tensioning sheet metal frame. The other end of the spring abuts against the back of the spring tensioning sheet metal frame. Forward bends are provided on both sides of the spring tensioning sheet metal frame. The roller structure is laterally fixed between the bends of the spring tensioning sheet metal frame. The rollers of the roller structure press on the rear belt of the soft belt to provide tension.

[0015] Preferably, the surface of the strip curtain covering the hollowed-out groove has wire harness holes.

[0016] Based on the same inventive concept, this application also discloses a marking machine, including a laser head and a wire harness, wherein the wire harness is connected to the rear side of the laser head and includes the electrically operated lifting structure as described above, wherein the laser head is mounted on a connecting plate.

[0017] Compared to existing technologies, this solution offers the following advantages: The electrically operated shielding lifting structure uses a reciprocating belt to shield the open areas of the semi-sealed outer shell. A spring-loaded tensioning structure ensures belt tension adjustment after prolonged operation, keeping the belt constantly taut. The semi-sealed outer shell solves the spatial structure and wiring issues, overcoming the limitation of shielding components not moving together. The belt-driven reciprocating shielding structure perfectly shields the open slots of the semi-sealed outer shell during marking and lifting, ensuring complete coverage and excellent dustproof performance. The belt reciprocating design utilizes a superior stepper motor screw lifting structure, eliminating the need for new mechanical drives, ensuring precise position control, high stability, and fast response. It can both drive the belt in reciprocating motion to meet shielding requirements and precisely adjust the marking and lifting distance. The belt can be perforated, allowing the laser head's wiring or other cables to easily pass through, achieving cable concealment and convenient wiring. It adopts a highly integrated design of coaxial direct-drive stepper motor screw, and innovative stacked arrangement and three-dimensional assembly technology. For example, the front belt reciprocating shielding structure is connected to the transmission lifting structure through a fixed block. The belt roller is set in the upper and lower gaps of the lifting structure, so that the limited space is utilized to the maximum extent and the structure is more compact. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the electrically shielded lifting structure of this solution, showing the laser head wiring harness running inside.

[0019] Figure 2 This is a three-dimensional structural diagram of the internal wiring harness of an embodiment of the laser head mounted on a dynamically shielded lifting structure in this solution.

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure inside the lifting shell of the electric shielding lifting structure of this solution, showing the internal routing of the laser head wiring harness.

[0021] Figure 4 for Figure 3 The main view;

[0022] Figure 5 for Figure 4 Sectional view along axis AA;

[0023] Figure 6This is a front view of an embodiment of the electrically shielded lifting structure of this solution, in which the laser head wiring harness is routed externally, and the connecting plate is hidden inside the lifting housing body.

[0024] Figure 7 for Figure 6 Sectional view along axis AA;

[0025] Figure 8 for Figure 4 Main view of the stepper motor screw lifting structure behind the belt;

[0026] Figure 9 This is a side view of the internal structure of the laser head mounted on a dynamically shielded lifting structure according to an embodiment of the present solution, showing the internal wiring harness of the laser head.

[0027] Figure 10 for Figure 9 Sectional view along axis AA;

[0028] Figure 11 A three-dimensional schematic diagram of the belt clamping structure of an embodiment of the electrically shielded lifting structure of this solution, in which the laser head wire bundle travels internally;

[0029] Figure 12 for Figure 4 BB-direction sectional view;

[0030] Figure 13 This is another embodiment of the electrically operated lifting structure of this solution. Figure 4 A cross-sectional view along the CC direction from a specific perspective;

[0031] Among them, 1-lifting housing body, 2-shielding structure, 22-belt, 221-belt opening, 23-spring tensioning structure, 231-spring tensioning sheet metal frame, 232-spring, 233-spring fixing block, 234-spring moving rod, 24-roller structure, 241-roller, 2411-roller slotting feature, 242-bearing, 243-locking screw, 244-sheet metal bracket, 25-tube roll, 3-connecting plate, 4-laser head, 5-fixed seat, 6-wire harness, 7-stepper motor screw lifting structure, 71-stepper motor, 72-screw, 73-fixing block, 74-adapter plate, 741-adapter plate fixing screw, 75-nut seat, 76-guide shaft, 77-coupling, 78-oil-free bushing, 79-limit switch. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0033] This application addresses the shortcomings of existing technologies by innovating upon the existing shielding lifting structure. It utilizes a reciprocating belt 22 to shield the semi-sealed outer shell's openwork, solving spatial structure and wiring issues. This solution provides an electrically powered shielding lifting structure, including a lifting outer shell 1, a shielding structure 2 within the lifting outer shell 1, and a connecting plate 3 outside the lifting outer shell 1. A fixed base 5 is installed below the lifting outer shell 1. A vertically oriented openwork groove is provided on the front surface of the lifting outer shell 1. The lifting structure is also included. The shielding structure 2 comprises a strip curtain, a strip curtain support structure, and a connecting plate fixing structure fixed to the strip curtain. The connecting plate fixing structure reciprocates within the lifting outer shell 1 under the drive of the lifting structure. The connecting plate fixing structure is fixedly connected to the connecting plate 3 outside the openwork groove. The end of the strip curtain is supported on the strip curtain support structure. When the connecting plate fixing structure reciprocates within the openwork groove, the strip curtain reciprocates under the support of the strip curtain support structure and shields the openwork groove. This design can conceal the internal structure, making the appearance more seamless, and can also prevent foreign objects from entering the structure and causing damage to the lifting mechanism.

[0034] In this embodiment, the connecting plate fixing structure includes a fixing block 73 and an adapter plate 74. The strip curtain is fixed between the fixing block 73 and the adapter plate 74. Specifically, the front surface of the fixing block 73 has a recess, and the rear surface of the adapter plate 74 has a protrusion of the corresponding size to the recess. The strip curtain has corresponding holes at the positions of the recesses. The protrusion of the adapter plate 74 is placed into the recess, and the holes are aligned. Two adapter plate fixing screws 741 pass through the adapter plate 74 and the strip curtain from the front and are threaded onto the fixing block 73. The fixing block 73 and the adapter plate 74 firmly clamp the strip curtain. The connecting plate 3 is fixed to the front of the adapter plate 74 by four screws. In addition to the above method, the connecting plate fixing structure can also use other methods such as clamping teeth to fix the strip curtain or snap fasteners to fix the connecting plate 74.

[0035] In this embodiment, the belt curtain uses a soft belt. The upper and lower ends of the belt curtain are supported on a belt curtain support structure. The belt curtain support structure uses a roller structure 24 including rollers 241. The soft belt is a closed loop, and the soft belt and the rollers 241 on both sides, which act as pulleys, form a parallel drive. The belt curtain can also use a thin, rigid metal belt, such as beryllium bronze, phosphor bronze, or some stainless steel, which are inherently elastic metals. In this embodiment, the soft belt material is leather to form a belt 22. Besides leather, other flexible materials such as cloth can also be used. Except for the front covering portion, the vertical middle section of the belt 22 can be hollowed out. The rollers 241 are made of nylon, which has high hardness and strength, is not easily worn, and has high abrasion resistance, extending the service life of the rollers. Nylon also has good self-lubricating properties, reducing friction between the rollers and the belt, allowing for smooth operation. Nylon has a relatively low density and is lightweight, reducing the overall weight of the equipment. Meanwhile, the nylon roller has a certain degree of elasticity, shock absorption, and self-lubrication, which can absorb and buffer the impact force during operation, reduce mutual friction, and enable it to operate with low or no noise. The reciprocating belt 22 is in a wraparound relationship with the roller 241.

[0036] In this embodiment, the lifting structure uses a stepper motor screw lifting structure 7. The stepper motor screw lifting structure 7 includes a stepper motor 71, a screw 72, a nut seat 75, and a guide shaft 76. The stepper motor 71 is vertically mounted inside the lifting housing body 1. The screw 72 is vertically mounted on the stepper motor 71 shaft via a coupling 77 and rotates under the driving force of the stepper motor 71 shaft. The nut seat 75 is threadedly connected to the screw 72 and is driven to lift when the screw 72 rotates. The nut seat 75 is fixedly connected to the connecting plate fixing structure. In this embodiment, the fixing block 73... The front surface has recesses, and four screws pass through the recesses in front of the fixing block 73, through the fixing block, and are fixedly connected to the front of the nut seat 75 on the back. The recesses are also used for positioning with the adapter plate 74 and limiting the belt 22. The two guide shafts 76 are fixed parallel to the screw 72 from both sides of the screw 72 to the fixing structure of the inner back plate of the lifting housing body 1, providing verticality and ensuring that the nut seat 75 travels in a straight line without tilting. The two guide shafts 76 pass through the nut seat 75 and slide within the oil-free bushings 78 installed on both sides of the nut seat 75 body, mainly to provide lubrication for the guide shafts 76. The start and end points of the stepper motor 71 are controlled by limit switches 79. The motor drive stops when the nut seat 75 moves to the position of the two limit switches 79 installed vertically on the inner back plate of the lifting housing body 1, which is controlled by software signals. Thanks to the stability and fast response of the stepper motor screw lifting structure 7, the belt 22 wraps evenly and smoothly around the roller 241. The belt 22 is close to the inner surface of the hollow groove, and vibration is minimal during operation, reducing problems such as incomplete sealing caused by shaking or vibration. This structure highly integrates drive, transmission, and guiding functions into a single compact unit. Compared with traditional belt drive structures, the overall volume is reduced by 40%, installation space requirements are reduced by 50%, and structural complexity is reduced by 30%, effectively reducing assembly errors. Furthermore, it can be installed as an independent module, making the installation process simpler and faster, saving installation time and costs. Space factors were fully considered during the design, and the reciprocating belt 22 and roller 241 were combined through a reasonable layout and design. By using limit switch 79, the manual mode of ordinary hand cranks on the market is changed to motor-driven mode, which has fast response speed and high accuracy, ensuring high-precision marking and focusing requirements. The lifting is driven by screw 72, which has high rigidity and stability and can withstand large axial loads. In addition, the screw 72 thread has a self-locking function to prevent it from falling down on its own due to its own weight in case of emergencies, thus avoiding accidents.

[0037] In this embodiment, the roller structure 24, in addition to the roller 241, also includes bearings 242 and locking screws 243. The roller structure 24 is laterally fixed to the back plate inside the lifting housing body 1 by sheet metal brackets 244. Two pairs of sheet metal brackets 244 are laterally fixed to the upper and lower ends of the strip curtain inside the lifting housing body 1. The locking screws 243 are fixed between the front ends of each pair of sheet metal brackets 244. The roller 241 is rotatably fixed to the locking screws 243 by the bearings 242 at both ends. To prevent the belt 22 from slipping and running off-center, the roller 241 has roller slotting features 2411 at both ends facing outwards. The slotting features 2411 are located at both ends of the roller 241, with the groove openings facing inwards towards the strip curtain. The two sides of the strip curtain are locked in the roller slotting features 2411, which can also be used to correct the position of the belt 22 and prevent the belt 22 from wearing due to the properties of the nylon material.

[0038] During the prolonged reciprocating motion of belt 22, belt 22 may become loose, resulting in insufficient tension and making it easy for foreign objects to enter the slots or for the slots to be incompletely blocked. To address this, a compact spring-loaded tensioning structure is designed. Utilizing spring-loaded tensioning sheet metal frames 231 on both sides of roller 241, the elasticity of spring 232 ensures that roller 241 maintains constant tension on belt 22 within a limited space. Roller 241 can elastically adjust its contact position according to the tightness of belt 22, ensuring continuous tension. In this embodiment, the spring-loaded tensioning structure is installed a short distance behind the reciprocating belt 22. The spring-loaded tensioning structure includes spring-loaded tensioning sheet metal frames 231, springs 232, spring fixing blocks 233, and spring moving rods 234. The spring fixing blocks 233 are fixed to the back plate behind the belt 22 inside the lifting housing body 1, and each spring fixing block 233 has a spring groove. One end of the spring 232 is installed in the spring groove. The spring moving rod 234 passes through the spring 232 in the spring groove from the rear side of the spring fixing block 233 and is fixedly connected to the spring tensioning sheet metal frame 231. In this embodiment, the front end of the spring moving rod 234 is provided with a threaded post. The spring moving rod 234 is screwed into the threaded hole at the corresponding position of the spring tensioning sheet metal frame 231 using the threaded post. The other end of the spring 232 abuts against the back of the spring tensioning sheet metal frame 231. The spring tensioning sheet metal frame 231 has forward bends on both sides. The roller structure 24 is laterally fixed between the bends of the spring tensioning sheet metal frame 231. This is a whole and needs to be installed in advance. The rollers of the roller structure 24 press against the rear belt of the belt 22 to provide tension. The spring-type tensioning structure relies on the elasticity of the spring 232 to make the roller 241 contact the belt 22. This process is noiseless. The tensioning structure is not limited to the spring type; a slider type or a torsion spring swing arm type can also be used. The tensioning roller 241 is connected to the swing arm of the torsion spring. By utilizing the elasticity of the torsion spring, the swing arm of the tensioning roller 241 makes a rotational motion, causing the tensioning roller 241 to slide in contact with the belt 22, resulting in less wear.

[0039] When wiring is required, the surface of the strip curtain covering the hollow groove has wire harness holes. In this embodiment, the belt 22 has belt openings 221 above the fixing block 73 and the adapter plate 74. The wire harness 6 can be inserted through the belt openings 221 and enter the interior of the lifting housing body 1. At this time, the wire harness 6 and the nut seat 75 can be fixed together by adhesive or bundling, and they can run together. The bottom should be left with enough space for movement.

[0040] Besides using roller structure 24, other structures can also be used for the support structure of the strip curtain. For example, when using a rigid strip, the strip curtain can use an open loop instead of a closed loop, forming an opening and closing roller shape. Even with a rigid curtain, both ends are wound around the roller tube 25. During the lifting and lowering process, the wound rigid strip performs an action similar to a roller shutter door. During the upward movement, one end repeatedly winds around the roller tube 25, while the other end continuously unwinds. The downward movement is the opposite. When using this scheme, a roller tube motor can be installed on each of the upper and lower roller tubes 25. In this case, the stepper motor screw lifting structure 7 can be omitted, and the roller tube motor can be used directly as the lifting structure for lifting and lowering control. When lifting, the roller tube motor rotates forward, and when lowering, the roller tube motor rotates in reverse. If there is enough space below the connecting plate fixing structure inside the lifting housing body 1, the lower roller tube 25 and roller tube motor can also be omitted. Guide rails on both sides of the rigid strip can be arranged inside the hollow groove, and only the roller tube 25 and roller tube motor at one end of the strip curtain can be used.

[0041] Based on the same inventive concept, this application also discloses a marking machine, including a laser head 4 and a wire harness 6. The wire harness 6 is connected to the rear side of the laser head 4 and includes the aforementioned electrically operated lifting structure with a shielding mechanism. In this embodiment, the connecting plate 3 is L-shaped, and the laser head 4 is mounted on the long side of the connecting plate 3. The shielding reciprocating motion of the belt 22 is mainly achieved by the stepper motor 71 driving the screw 72 to move, thereby performing reciprocating motion. The belt 22 wraps around the roller 241, providing directional restriction and sliding. The fixing block 73 is first connected to the nut seat 75 by screws. The fixing block 73 and the adapter plate 74 are clamped in the middle by the adapter plate fixing screw 741, so that the belt 22 and the nut seat 75 move up and down together, thereby realizing that the stepper motor 71 drives the screw 72 to reciprocate while driving the belt 22 to reciprocate and shield the hollow groove. The belt 22 is divided into two types: with holes and without holes, mainly corresponding to whether the wire harness 6 of the laser head 4 runs inside or outside the lifting housing body 1. The biggest advantage of using this solution is that it is compatible with both the placement of the laser head 4's wiring harness 6 inside and outside the liftable housing body 1. Furthermore, while the laser head 4's wiring harness 6 runs inside the liftable housing body 1, it can also perfectly cover the hollowed-out groove of the liftable housing body 1. In addition, the belt 22 can also reciprocate and cover without being affected, making its appearance more beautiful and its structure more compact.

[0042] In this specification, the schematic diagrams in the accompanying drawings highlight the main features and key parts, and details are appropriately simplified or omitted. Therefore, they do not represent actual scale and size relationships. The terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] The above description is only a preferred embodiment of the present solution, but the scope of protection claimed by the present solution is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. An electrically operated lifting structure with a shielding function, comprising a lifting housing body (1), a shielding structure (2) in the lifting housing body (1), and a connecting plate (3) outside the lifting housing body (1), wherein a vertical hollow groove is arranged on the front surface of the lifting housing body (1), characterized in that: It also includes a lifting structure. The shielding structure (2) includes a strip curtain, a strip curtain support structure and a connecting plate fixing structure fixed on the strip curtain. The connecting plate fixing structure moves back and forth in the lifting shell body (1) under the drive of the lifting structure. The connecting plate fixing structure is fixedly connected to the connecting plate (3) outside the hollow groove. The end of the strip curtain is supported on the strip curtain support structure. When the connecting plate fixing structure moves back and forth within the hollow groove, the strip curtain moves back and forth under the support of the strip curtain support structure and shields the hollow groove.

2. The motorized screening lifting structure according to claim 1, characterized in that: The connecting plate fixing structure includes a fixing block (73) and a transition plate (74). The strip curtain is fixed between the fixing block (73) and the transition plate (74). The connecting plate (3) is fixed in front of the transition plate (74).

3. The electrically operated shielding lifting structure according to claim 1, characterized in that: The strip curtain uses a soft belt, and the upper and lower ends of the strip curtain are supported on the strip curtain support structure. The strip curtain support structure uses a roller structure (24) including rollers (241). The soft belt is an annular closed belt. The soft belt and the rollers (241) on both sides as pulleys form a flat belt parallel transmission. The soft belt uses a tensioning structure to provide tension.

4. The electrically operated shielding lifting structure according to claim 3, characterized in that: The soft strap material is made of leather to form a belt (22).

5. The electrically operated shielding lifting structure according to claim 1, characterized in that: The lifting structure uses a stepper motor screw lifting structure (7), which includes a stepper motor (71), a screw (72), a nut seat (75), and a guide shaft (76). The stepper motor (71) is vertically mounted on the shaft inside the lifting housing body (1). The screw (72) is vertically mounted on the shaft of the stepper motor (71) and rotates under the driving force of the shaft of the stepper motor (71). The nut seat (75) is threadedly connected to the screw (72) and is driven to lift when the screw (72) rotates. The nut seat (75) is fixedly connected to the connecting plate fixing structure. The guide shaft (76) is fixed on the lifting housing body (1) from both sides of the screw (72) parallel to the screw (72). The guide shaft (76) passes through the nut seat (75) and slides in the oil-free bushing (78) installed on the nut seat (75).

6. The electrically operated shielding lifting structure according to claim 3, characterized in that: The roller structure (24) also includes bearings (242) and locking screws (243). The roller structure (24) is horizontally fixed inside the lifting housing body (1) by sheet metal brackets (244). Two pairs of sheet metal brackets (244) are horizontally fixed at the upper and lower ends of the strip curtain inside the lifting housing body (1). The locking screws (243) are fixed between the front ends of each pair of sheet metal brackets (244). The roller (241) is rotatably fixed on the locking screws (243) by bearings (242) at both ends. The roller (241) has roller slotting features (2411) at both ends facing the outer end of the roller (241) towards the inner side of the strip curtain. The two sides of the strip curtain are stuck in the roller slotting features (2411).

7. The electrically operated shielding lifting structure according to claim 3, characterized in that: The roller (241) is made of nylon.

8. The electrically operated shielding lifting structure according to claim 3, characterized in that: The tensioning structure uses a spring-type tensioning structure, which includes a spring tensioning sheet metal frame (231), a spring (232), a spring fixing block (233), and a spring moving rod (234). The spring fixing block (233) is fixed to the rear side of the inner belt (22) of the lifting housing body (1). A spring groove is provided in the spring fixing block (233), and one end of the spring (232) is installed in the spring groove. The spring moving rod (234) moves from the spring fixing block (231) to the inner belt (22). The spring (232) passing through the spring groove on the rear side of the fixed block (233) is fixedly connected to the spring tensioning sheet metal frame (231). The other end of the spring (232) rests against the back of the spring tensioning sheet metal frame (231). The spring tensioning sheet metal frame (231) has forward bends on both sides. The roller structure (24) is horizontally fixed between the bends of the spring tensioning sheet metal frame (231). The roller (241) of the roller structure (24) presses on the back belt of the soft belt to provide tension.

9. The electrically operated shielding lifting structure according to any one of claims 1 to 8, characterized in that: The surface of the strip curtain covering the hollowed-out groove has wire harness holes.

10. A marking machine, comprising a laser head (4) and a wire harness (6), characterized in that: The wiring harness (6) is connected to the rear side of the laser head (4), characterized in that: it includes an electrically operated shielding lifting structure as described in any one of claims 1 to 9, and the laser head (4) is mounted on the connecting plate (3).

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