A laser engraving machine

Abstract

The present application relates to a kind of laser engraving machines, it includes: engraving head assembly and for driving engraving head assembly transverse movement transverse movement mechanism;The transverse movement mechanism includes transverse guide rail, engraving head assembly includes with the sliding connection of transverse guide rail vertical base plate, transverse movement mechanism drives vertical base plate along transverse guide rail transverse movement;The back of the vertical base plate is provided with zero setting rod and for adjusting the height of zero setting rod adjustment assembly, when engraving head assembly horizontal stop, adjustment assembly drives zero setting rod to move down to zero position;When engraving head assembly transverse movement, adjustment assembly drives zero setting rod to move up to hidden position.The present application utilizes laser engraving head assembly when engraving, constantly move up and down, by setting two driving wheels and intermediate wheel so that adjusting ring is always in the rotation of the same direction, the convex point of adjusting ring inner side and the side edge of zero setting rod abut and constantly push up zero setting rod, so that zero setting rod can be hidden.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser processing devices, in particular to a laser engraving machine. BACKGROUND

[0002] At present, when the laser engraving machine is working, the working distance needs to be detected, and then the focusing is adjusted. When adjusting the focus, the zero adjustment rod used for adjusting the focus is extended below the laser engraving head. Then the zero adjustment rod moves downward with the laser engraving head, or the workbench carrying the engraved object moves upward until the zero adjustment rod abuts against the engraved object. At this time, the zero distance of the laser engraving head is completed, and the distance between the laser engraving head and the engraved object is determined by the system of the laser engraving machine as the initial value (zero value). The system of the laser engraving machine controls the workbench to move downward by a predetermined distance or controls the laser engraving head to move upward by a predetermined distance to complete the focusing. Then the laser engraving head moves under the drive of the two-dimensional or three-dimensional moving laser and performs engraving on the engraved object. When the engraving head moves in a plane, the zero adjustment rod is located below the laser engraving head. When there is foreign matter on the workbench, the zero adjustment rod will collide with the foreign matter when moving two-dimensionally with the laser engraving head, resulting in damage to the zero adjustment rod.

[0003] In order to avoid damage to the zero adjustment rod, some manufacturers have developed a combined structure of the zero adjustment rod. For example, the utility model patent with the application number CN202122522331.X and the name of a workbench focusing reference assembly based on the focal length of a laser head. The focusing reference assembly of the patent technical solution divides the touch head into a main touch body and a vice touch body. A vice elastic element is connected between the main touch body and the vice touch body. When the main touch body contacts the foreign matter, the main touch body bends relative to the vice touch body. After passing the foreign matter, the main touch body is reset under the driving of the vice elastic element, without affecting the next focusing.

[0004] However, when the main touch body collides with the foreign matter, the moving speed of the laser engraving head is very high, which may cause damage to the foreign matter, and the side surface of the main touch body may also be deformed. Therefore, it is necessary to design a zero adjustment rod that can automatically retract during work to avoid collision with foreign matter. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art and provide a laser engraving machine. When the laser engraving head of the laser engraving machine moves laterally, the zero adjustment rod automatically retracts, avoiding exposure of the zero adjustment rod and reducing the risk of collision with foreign matter.

[0006] A laser engraving machine comprises an engraving head assembly and a transverse moving mechanism for driving the engraving head assembly to move transversely; the transverse moving mechanism comprises a transverse guide rail, and the engraving head assembly comprises a vertical base plate slidably connected with the transverse guide rail, and the transverse moving mechanism drives the vertical base plate to move transversely along the transverse guide rail; the back surface of the vertical base plate is provided with a zero setting rod and an adjusting assembly for adjusting the height of the zero setting rod, and when the engraving head assembly is horizontally stopped, the adjusting assembly drives the zero setting rod to move downward to a zero setting position; when the engraving head assembly moves transversely, the adjusting assembly drives the zero setting rod to move upward to a hidden position.

[0007] Further, the middle part of the side surface of the zero setting rod is provided with a spiral side edge; the adjusting assembly comprises an adjusting ring sleeved with the middle part of the zero setting rod, the inner side surface of the adjusting ring is provided with a convex point, and the convex point abuts against the lower end surface of the side edge; the adjusting assembly is further provided with a driving mechanism for driving the adjusting ring to rotate when the engraving head assembly moves.

[0008] Further, the driving mechanism comprises driving wheels located on both sides of the adjusting ring and two fixed plates provided on the back surface of the vertical base plate, the two fixed plates are arranged in parallel and spaced apart, the fixed plate is provided with a through hole for the zero setting rod to pass through, and an active space is formed between the two fixed plates, one of the driving wheels and the adjusting ring are provided with an intermediate wheel, the intermediate wheel abuts against the adjusting ring, the connecting shaft in the middle part of the intermediate wheel is connected with the two fixed plates, the two sides of the fixed plate are respectively provided with transverse moving grooves, the connecting shaft in the middle part of the driving wheel is respectively inserted into the corresponding transverse moving grooves, and the two ends of the connecting shaft are respectively connected with limiting members for preventing the connecting shaft from being separated from the transverse moving grooves, and one end of the driving wheel extends out of the fixed block and abuts against the transverse guide rail.

[0009] Preferably, the driving wheel and the intermediate wheel are both rotating wheels, the rotating wheel comprises the connecting shaft, the connecting shaft is sleeved with a bearing, the bearing is sleeved with a sleeve ring, and the side surface of the sleeve ring is provided with friction lines.

[0010] Preferably, the transverse moving groove is a waist-shaped groove.

[0011] Preferably, the upper end surface of the upper fixed plate is provided with an upper sink hole, and the upper sink hole covers the transverse moving groove of the fixed plate; the lower end surface of the lower fixed plate is provided with a lower sink hole, and the lower sink hole covers the transverse moving groove of the fixed plate, and the limiting member is correspondingly located in the upper sink hole or the lower sink hole.

[0012] More preferably, the upper sink hole and the lower sink hole are rectangular or waist-shaped, and are used for guiding the left and right movement of the limiting member.

[0013] Furthermore, the back of the vertical base plate is provided with an upper fixing block, which is located above the fixing plate. The upper fixing block is connected to an upper guide tube for guiding the zero adjustment rod to move linearly up and down. The upper fixing block is provided with a through hole that matches the upper end of the zero adjustment rod. The upper end of the zero adjustment rod is connected to a zero adjustment block for preventing the zero adjustment rod from disengaging from the upper guide tube.

[0014] Furthermore, the adjustment assembly includes a tension spring fitted around the upper guide tube, with both ends of the tension spring connected to the zeroing block and the upper fixing plate, respectively.

[0015] Preferably, the inner side of the upper guide tube is provided with a protrusion, and the upper middle side of the zeroing rod is provided with a guide groove that cooperates with the protrusion.

[0016] Preferably, a sensing block is provided at the upper end of the vertical substrate, and a sensing hole that cooperates with the zeroing block is provided in the middle of the sensing block.

[0017] The beneficial effects of the present invention are as follows: The present invention utilizes the laser engraving head assembly to continuously move up and down during engraving. By setting two drive wheels and an intermediate wheel, the adjusting ring is always rotating in the same direction. The protrusions on the inner side of the adjusting ring abut against the side edge of the zero-adjustment rod and continuously push the zero-adjustment rod upward, so that the zero-adjustment rod can be hidden. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one structure of the laser engraving machine in this embodiment.

[0019] Figure 2 for Figure 1 A magnified structural diagram of point A in the diagram.

[0020] Figure 3 This is a schematic diagram of a structure in which the zero-adjustment lever is in the zero-adjustment position according to this embodiment.

[0021] Figure 4 for Figure 3 A magnified structural diagram of point B in the diagram.

[0022] Figure 5 This is a schematic diagram of one structure of the vertical substrate in this embodiment.

[0023] Figure 6 This is a schematic diagram of a structure in which the zero-adjustment lever is located in a hidden position in this embodiment.

[0024] Figure 7 This is a schematic diagram of another structure in which the zero-adjustment lever is located in a hidden position in this embodiment.

[0025] Figure 8 This is a schematic diagram of one structure of the adjustment ring in this embodiment.

[0026] Figure label:

[0027] 1 - transverse guide rail; 2 - carving head assembly; 3 - vertical base plate; 4 - side edge; 5 - guide groove; 6 - fixing plate; 7 - zero adjustment rod; 8 - right drive wheel; 9 - limiting piece; 10 - connecting shaft; 11 - transverse movement groove; 12 - adjusting ring; 13 - intermediate wheel; 14 - left drive wheel; 15 - inductive block; 16 - zero adjustment block; 17 - upper guide tube; 18 - tension spring; 21 - protrusion; 22 - upper fixing block; 23 - perforation; 24 - mounting hole; 25 - protrusion; 26 - upper counterbore. DETAILED DESCRIPTION

[0028] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0032] The present application will be described in detail below with reference to the drawings. As shown in Figures 1 to 3 .

[0033] Example 1: see Figure 1 , Figure 2A laser engraving machine comprises an engraving head assembly 2 and a transverse moving mechanism for driving the engraving head assembly 2 to move transversely; the transverse moving mechanism comprises a transverse guide rail 1, and the engraving head assembly 2 comprises a vertical base plate 3 which is in sliding connection with the transverse guide rail 1, and the transverse moving mechanism drives the vertical base plate 3 to move transversely along the transverse guide rail 1;

[0034] The back of the vertical base plate 3 is provided with a zero adjustment rod 7 and an adjusting assembly for adjusting the height of the zero adjustment rod 7; when the engraving head assembly 2 is horizontally stopped, the adjusting assembly drives the zero adjustment rod 7 to move downward to a zero adjustment position; when the engraving head assembly 2 moves transversely, the adjusting assembly drives the zero adjustment rod 7 to move upward to a hidden position.

[0035] In the technical solution, the zero adjustment rod 7 is arranged on the back of the vertical base plate 3 and is driven to move upward and downward by the adjusting assembly; when focusing, the engraving head assembly 2 is kept horizontally stopped, i.e. the engraving head assembly 2 does not move transversely, at this time, the adjusting assembly drives the zero adjustment rod 7 to move downward, the zero adjustment rod 7 moves to the zero adjustment position, at this time, the zero adjustment rod 7 cannot move downward any more, i.e. the zero adjustment rod 7 moves to the lowermost position; then vertical height adjustment is performed, the height of a workbench is adjusted until a workpiece (an object to be engraved) on the workbench contacts the zero adjustment rod 7; at this time, zero adjustment is completed, then the control part of the laser engraving machine controls the workbench to move downward by a predetermined distance to complete focusing; of course, the transverse moving mechanism can also be adjusted to move upward and downward until the zero adjustment rod 7 contacts the workpiece on the workbench to complete zero adjustment. In addition, the engraving head assembly 2 can be the prior art, mainly comprising the vertical base plate 3 and a laser engraving head fixed to the front of the vertical base plate.

[0036] When engraving, the engraving head assembly 2 moves transversely along the transverse guide rail 1 under the driving of a transverse laser, at this time, the adjusting assembly drives the zero adjustment rod 7 to move upward, so that the lower end surface of the zero adjustment rod 7 is located above the lower end surface of the engraving head of the engraving head assembly 2. The hidden position here refers to the position of the zero adjustment rod 7 when the lower end surface of the zero adjustment rod 7 is located above the lower end surface of the laser engraving head. In the embodiment, it is exemplarily considered that the lower end surface of the zero adjustment rod 7 is located above the lower end surface of the vertical base plate 3.

[0037] In the technical solution, the adjusting assembly and the zero adjustment rod 7 can be exemplarily designed as a screw rod structure, a screw rod and a motor are adopted, the screw rod is provided with a threaded tube, the motor drives the screw rod to rotate, the screw rod rotates and drives the threaded tube to move upward and downward; in order to facilitate directional upward and downward movement of the threaded tube, the vertical base plate 3 can be provided with a directional structure for assisting directional movement of the threaded tube, such as a linear bearing, etc., the threaded tube is in sleeve connection with the linear bearing, and the linear bearing is fixed to the vertical base plate 3; when zero adjustment is performed, the threaded tube is driven to move downward to the zero adjustment position; when engraving is performed, the threaded tube is driven to move upward to the hidden position.

[0038] Referring to Figure 3 , Figure 4 , the side middle part of the zeroing rod 7 is provided with a helical side edge 4; the adjusting assembly includes an adjusting ring 12 sleeved with the middle part of the zeroing rod 7, referring to Figure 8 , the inner side of the adjusting ring 12 is provided with a convex point 25 abutting against the lower end surface of the side edge 4; the adjusting assembly is further provided with a driving mechanism for driving the adjusting ring 12 to rotate when the carving head assembly 2 moves.

[0039] In order to facilitate the driving of the up and down movement of the zeroing rod 7, in the embodiment, the helical side edge 4 is arranged in the middle part of the side of the zeroing rod 7, and the adjusting ring 12 is sleeved with the middle part of the zeroing rod 7; when adjusting, the driving mechanism drives the adjusting ring 12 to rotate, the adjusting ring 12 rotates relative to the zeroing rod 7, and the convex point 25 on the inner side of the adjusting ring 12 also moves along the side edge 4 of the side of the zeroing rod 7; when the convex point 25 moves downward along the side edge 4, the convex point 25 will push the side edge 4 and the zeroing rod 7 to move upward; when the convex point 25 moves upward along the side edge 4, the zeroing rod 7 will move downward under the action of its own gravity. In order to make the zeroing rod 7 move upward to the hidden position when the carving head assembly 2 moves, it is necessary to match the rotating direction of the adjusting ring 12 with the helical rotation of the side edge 4, so that the convex point 25 pushes the side edge 4 and the zeroing rod 7 to move upward when the carving head assembly 2 moves.

[0040] It can be understood that, in order to facilitate the up and down linear movement of the zeroing rod 7, the vertical base plate 3 can be provided with a guide sleeve cooperating with the zeroing rod 7 or a linear bearing and the like for assisting the up and down movement of the zeroing rod 7. So that the zeroing rod 7 does not shake greatly when moving up and down.

[0041] Secondly, in order to facilitate the control of the up and down movement of the zeroing rod 7, when the zeroing rod 7 reaches the zeroing position, the convex point 25 on the inner side of the adjusting ring 12 is still in contact with the side edge 4 of the zeroing rod 7, so as to avoid the disengagement of the zeroing rod 7 from the adjusting ring 12.

[0042] Referring to Figures 3 to 7 , the driving mechanism includes driving wheels located on both sides of the adjusting ring 12 and two fixed plates 6 arranged on the back of the vertical base plate 3, referring to Figure 5Two fixed plates 6 are arranged in parallel and spaced apart. The fixed plates 6 are provided with through holes 23 for the zero adjustment rod 7 to pass through, and an movable space is formed between the two fixed plates 6. An intermediate wheel 13 is provided between one of the drive wheels and the adjusting ring 12. The intermediate wheel 13 abuts against the adjusting ring 12. The fixed plate 6 is provided with mounting holes 24 for connecting shaft 10 of the intermediate wheel 13. The connecting shaft 10 in the middle of the intermediate wheel 13 is connected to the two fixed plates 6. The two sides of the fixed plates 6 are respectively provided with transverse moving grooves 11. The two ends of the connecting shaft 10 in the middle of the drive wheel are respectively inserted into the corresponding transverse moving grooves 11, and the two ends of the connecting shaft 10 are respectively connected with limiting members 9 to prevent the connecting shaft 10 from disengaging from the transverse moving groove 11. One end of the drive wheel extends out of the fixed block and abuts against the transverse guide rail 1.

[0043] See appendix Figure 6 , Figure 7 When engraving, the engraving head assembly 2 will move laterally along the transverse guide rail 1. The lateral movement includes leftward movement and rightward movement. For ease of description, the intermediate wheel 13 is exemplarily set on the left side. At the same time, the drive wheel on the left side is called the left drive wheel 14, and the drive wheel on the right side is called the right drive wheel 8.

[0044] See Figure 6 When the engraving head assembly 2 moves to the right along the transverse guide rail 1, both the left drive wheel 14 and the right drive wheel 8 abut against the transverse guide rail 1 and are affected by the friction force of the transverse guide rail 1. This friction force is in the left direction, so the friction force drives the left drive wheel 14 and the right drive wheel 8 to move to the left first. The connecting shaft 10 of the left drive wheel 14 and the right drive wheel 8 moves to the left along the transverse moving groove 11 and moves to the left end of the moving groove. At this time, the left drive wheel 14 separates from the intermediate wheel 13, and the side of the right drive wheel 8 abuts against the side of the adjusting ring 12. After that, the right drive wheel 8 rotates relative to the fixed plate 6. For ease of understanding, the rotation direction of the right drive wheel 8 can be defined as the right-hand rotation direction. At the same time, because the right drive wheel... The side of wheel 8 abuts against the side of the adjusting ring 12. The right drive wheel 8 will drive the adjusting ring 12 to rotate (rotate). The rotation direction of the adjusting ring 12 is opposite to the rotation direction of the right drive wheel 8, which can be defined as the left hand direction. At this time, the adjusting ring 12 rotates and drives the zero adjustment lever 7 to move upward until the protrusion 25 on the side of the adjusting ring 12 leaves the side edge 4 of the zero adjustment lever 7. When leaving the side edge 4, the zero adjustment lever 7 will fall a short distance under the action of gravity. The protrusion 25 will contact the bottom surface of the side edge 4 again, and will continue to push the zero adjustment lever 7 to move upward until the protrusion 25 on the side of the adjusting ring 12 leaves the side edge 4 of the zero adjustment lever 7 again. This process is repeated. During this period, the zero adjustment lever 7 is always kept in the hidden position.

[0045] See Figure 7When the carving head assembly 2 moves left along the transverse guide rail 1, since the left driving wheel 14 and the right driving wheel 8 are in abutment with the transverse guide rail 1 and are affected by the friction force of the transverse guide rail 1, the friction force drives the left driving wheel 14 and the right driving wheel 8 to move right first; the connecting shaft 10 of the left driving wheel 14 and the right driving wheel 8 moves right along the transverse moving groove 11 and moves to the right end of the moving groove; at this time, the right driving wheel 8 is separated from the adjusting ring 12, and the side surface of the left driving wheel 14 is in abutment with the side surface of the intermediate wheel 13; thereafter, the left driving wheel 14 rotates relative to the fixed plate 6, and at this time, the rotation direction of the left driving wheel 14 is the left-hand rotation direction, and at the same time, since the side surface of the intermediate wheel 13 is in abutment with the side surface of the adjusting ring 12, the left driving wheel 14 drives the adjusting ring 12 to rotate (rotate around its own axis) through the intermediate wheel 13, and the rotation directions of the left driving wheel 14 and the adjusting ring 12 are opposite to the rotation direction of the intermediate wheel 13, so the rotation direction of the adjusting ring 12 is the same as the rotation direction of the left driving wheel 14, and the rotation direction of the adjusting ring 12 is the left-hand rotation direction; as known from the above, at this time, the rotation of the adjusting ring 12 drives the zero adjustment rod 7 to move up until the zero adjustment rod 7 is always kept in the hidden position. Whether the carving head assembly 2 moves left or right, the zero adjustment rod 7 can be driven to move up.

[0046] It can be understood that, for the convenience of setting, the thickness of the driving wheel, the thickness of the intermediate wheel 13 and the thickness of the adjusting ring 12 can be equal or have a small difference, and are adapted to the vertical width of the moving space; so that the driving wheel, the intermediate wheel 13 and the adjusting ring 12 can rotate freely.

[0047] Secondly, in order to facilitate the driving wheel to drive the intermediate wheel 13 or the adjusting ring 12 to rotate, the side surface of the driving wheel is provided with friction lines, the side surface of the intermediate wheel 13 is provided with friction lines, and the side surface of the adjusting ring 12 is provided with friction lines; preferably, the friction lines are protruding teeth.

[0048] Preferably, the driving wheel and the intermediate wheel 13 are both rotating wheels, the rotating wheel comprises the connecting shaft 10, the connecting shaft 10 is sleeved with a bearing, the bearing is sleeved with a sleeve ring, and the side surface of the sleeve ring is provided with friction lines.

[0049] In specific implementation, the driving wheel and the intermediate wheel 13 need to rotate relative to the fixed plate 6, and exemplarily, the driving wheel and the intermediate wheel 13 used in the embodiment are both rotating wheel structures, and the sleeve ring located on the outer side can rotate relative to the connecting shaft 10 through the setting of the bearing, so as to rotate relative to the fixed plate 6. It can be understood that the connecting shaft 10 of the driving wheel and the intermediate wheel 13 can be connected with the fixed plate 6 through the bearing, and the driving wheel and the intermediate wheel 13 both adopt the structure of a fixed wheel, i.e. a wheel shaft integrated structure, and when rotating, the connecting shaft 10 rotates relative to the bearing, so as to rotate relative to the fixed plate 6.

[0050] Preferably, the transverse moving groove 11 is a waist-shaped groove.

[0051] In order to facilitate the left and right movement of the connecting shaft 10 of the driving wheel, the transverse movement slot 11 on the fixed plate 6 is designed as a waist-shaped slot, and the two ends of the waist-shaped slot are respectively matched with the connecting shaft 10. The connecting shaft 10 can be moved to the end of the waist-shaped slot, thereby increasing the contact area between the connecting shaft 10 and the transverse movement slot 11, and reducing the shaking of the connecting shaft 10.

[0052] Preferably, the upper end surface of the upper fixed plate 6 is provided with an upper sink hole 26, and the upper sink hole 26 covers the transverse movement slot 11 of the fixed plate 6. The lower end surface of the lower fixed plate 6 is provided with a lower sink hole, and the lower sink hole covers the transverse movement slot 11 of the fixed plate 6. The limiting piece 9 is correspondingly located in the upper sink hole 26 or the lower sink hole.

[0053] More preferably, the upper sink hole 26 and the lower sink hole are designed as rectangles or waist shapes, and are used to guide the left and right movement of the limiting piece 9.

[0054] The upper sink hole 26 and the lower sink hole are designed as rectangles, so as to become guide holes. The limiting piece 9 is located in the upper sink hole 26 or the lower sink hole. When the connecting shaft 10 moves with the driving wheel, the limiting piece 9 is driven to move transversely. At the same time, the limiting piece 9 is located in the upper sink hole 26 or the lower sink hole, and is limited and guided by the upper sink hole 26 or the lower sink hole, so that the movement of the connecting shaft 10 is more stable and does not shake. In a specific design, the limiting piece 9 can be designed as a rectangle, a circle or a hexagon. In a specific use, a nut can be used, and the connecting shaft 10 can be a bolt. When the connecting shaft 10 of the intermediate wheel 13 is connected with the fixed plate 6, an interference fit can be used, and the installation can be performed by thermal expansion and cold contraction. Of course, the limiting piece 9 such as a nut can be connected to the two ends of the connecting shaft 10 of the intermediate wheel 13.

[0055] Further, the back surface of the vertical base plate 3 is provided with an upper fixed block 22 located above the fixed plate 6. The upper fixed block 22 is connected with an upper guide pipe 17 used to guide the linear up and down movement of the zero adjustment rod 7. The upper fixed block 22 is provided with a through hole 23 matched with the upper end of the zero adjustment rod 7. The upper end of the zero adjustment rod 7 is connected with a zero adjustment block 16 used to prevent the zero adjustment rod 7 from being separated from the upper guide pipe 17.

[0056] Referring to the drawings, Figure 3When the carving head assembly 2 is stationary in a horizontal plane, the zeroing rod 7 moves downward under its own gravity, and at the same time pushes the adjusting ring 12 to rotate. When the zeroing rod 7 reaches the zeroing position, the convex point 25 on the inner side of the adjusting ring 12 is still in abutment with the side edge 4 on the side surface of the zeroing rod 7, and at this time, it is necessary to limit the zeroing rod 7 from continuing to move downward. In the technical solution, the upper guide pipe 17 and the zeroing block 16 are arranged, the upper middle part of the zeroing rod 7 passes through the upper guide pipe 17 and the upper fixed block 22, and under the guidance of the upper guide pipe 17, the zeroing rod 7 moves vertically downward. When the zeroing block 16 is in abutment with the upper guide pipe 17, the zeroing rod 7 is limited to move downward, and at this time, the zeroing rod 7 reaches the zeroing position. The zeroing block 16 can not only limit the zeroing rod 7 from being separated from the upper guide pipe 17, but also can position the zeroing position.

[0057] It can be understood that when the upper guide pipe 17 is connected with the upper fixed block 22, the upper guide pipe 17 can be connected with the upper fixed block 22 by welding or by a threaded connection mode. The lower part of the upper guide pipe 17 is provided with external threads, the upper fixed block 22 is provided with internal threads, and the upper guide pipe 17 is connected with the upper fixed block 22 in a threaded connection mode. Of course, the upper guide pipe 17 can also be connected with the upper fixed block 22 in a plug-in connection mode, an interference fit connection mode or the like.

[0058] Further, the adjusting assembly comprises a tension spring 18 sleeved outside the upper guide pipe 17, and the two ends of the tension spring 18 are connected with the zeroing block 16 and the upper fixed plate 6 respectively.

[0059] When the zeroing position is adjusted, if the zeroing rod 7 is located in the hidden position at this time, it is necessary to relatively quickly move the zeroing rod 7 downward at this time. The technical solution exemplarily provides the tension spring 18, and of course other elastic members can also be used. Through the action force of the tension spring 18, the zeroing rod 7 is subjected to a downward pulling force, which can overcome the friction force between the zeroing rod 7 and the convex point 25, the friction force between the adjusting ring 12 and the intermediate wheel 13, and the friction force between one of the drive wheels and the transverse guide rail 1. The zeroing rod 7 is quickly moved downward to the zeroing position under the pulling force of the tension spring 18.

[0060] Preferably, the inner side surface of the upper guide pipe 17 is provided with a convex part 21, and the upper middle side surface of the zeroing rod 7 is provided with a guide groove 5 matched with the convex part 21.

[0061] In the relative movement between the adjusting ring 12 and the zeroing rod 7, the zeroing rod 7 needs to keep moving up and down, and cannot rotate, otherwise the adjusting ring 12 will rotate together with the zeroing rod 7, so that the adjustment cannot be achieved; the rotation of the zeroing rod 7 needs to be limited, in the embodiment, a protrusion 21 is arranged on the inner side of the upper guide pipe 17, and a guide groove 5 is arranged on the middle upper part of the zeroing rod 7, in use, the zeroing rod 7 is inserted into the upper guide pipe 17, and the protrusion 21 is inserted into the guide groove 5; so as to prevent the zeroing rod 7 from rotating. The protrusion 21 of the upper guide pipe 17 can be obtained by stamping the side surface of the upper guide pipe 17, or by other means. When limiting the rotation of the zeroing rod 7, other means can also be used.

[0062] Preferably, the upper end of the vertical base plate 3 is provided with a sensing block 15, and the middle part of the sensing block 15 is provided with a sensing hole matched with the zeroing block 16.

[0063] When the zeroing rod 7 is in the zeroing position, if the workbench lifting is observed by naked eye and the workpiece is in contact, the error is large; generally, an automatic adjustment mode is used, in the embodiment, the sensing block 15 is exemplarily arranged, the sensing block 15 is connected with the laser engraving machine control system, when the workbench slowly rises to contact the zeroing rod 7, a small force is applied to the zeroing rod 7, the zeroing rod 7 moves upward under the force and drives the zeroing block 16 to move upward, the sensing block 15 senses the movement of the zeroing block 16 and sends a signal to the laser engraving machine control system, the laser engraving machine control system controls the workbench to stop rising, at this time, the workbench height gauge is the zero height, then the laser engraving machine control system controls the workbench to move downward by a predetermined distance, so as to complete the focusing.

[0064] Preferably, the zeroing rod 7 can be a telescopic rod, which includes an upper rod and a lower rod, the lower end of the upper rod is provided with a threaded hole, the upper end of the lower rod is provided with an external thread, the upper rod and the lower rod are threadedly connected, and the side edge is arranged on the upper rod. When not working, most of the lower rod can be hidden in the upper rod, and the zeroing rod 7 can be hidden.

[0065] The above is only a preferred embodiment of the present application, and those skilled in the art can make changes in specific implementation and application range according to the idea of the present application, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A laser engraver comprising: The invention discloses a carving head assembly and a transverse moving mechanism for driving the transverse moving of the carving head assembly; the transverse moving mechanism comprises a transverse guide rail, and the carving head assembly comprises a vertical base plate in sliding connection with the transverse guide rail, and the transverse moving mechanism drives the vertical base plate to move transversely along the transverse guide rail; characterized in that: The back of the vertical base plate is provided with a zero adjustment rod and an adjusting assembly for adjusting the height of the zero adjustment rod; when the carving head assembly is horizontally stopped, the adjusting assembly drives the zero adjustment rod to move downward to a zero adjustment position; when the carving head assembly moves transversely, the adjusting assembly drives the zero adjustment rod to move upward to a hidden position. The middle part of the side surface of the zero adjustment rod is provided with a spiral side edge; the adjusting assembly comprises an adjusting ring in sleeve connection with the middle part of the zero adjustment rod, the inner side surface of the adjusting ring is provided with a convex point, the convex point is in abutment with the lower end surface of the side edge; the adjusting assembly is further provided with a driving mechanism for driving the self-rotation of the adjusting ring when the carving head assembly moves. The driving mechanism comprises driving wheels located on both sides of the adjusting ring and two fixed plates provided on the back of the vertical base plate; the two fixed plates are arranged in parallel and at intervals, the fixed plate is provided with a through hole for the zero adjustment rod to pass through, and an active space is formed between the two fixed plates; one of the driving wheels is in abutment with the adjusting ring through an intermediate wheel, the connecting shaft in the middle part of the intermediate wheel is connected with the two fixed plates, the two sides of the fixed plate are respectively provided with transverse moving grooves, the connecting shaft in the middle part of the driving wheel is inserted into the corresponding transverse moving groove at both ends, and the both ends of the connecting shaft are respectively connected with limiting members for preventing the connecting shaft from being separated from the transverse moving grooves, and one end of the driving wheel extends out of the fixed block and is in abutment with the transverse guide rail. The back of the vertical base plate is provided with an upper fixed block above the fixed plate, the upper fixed block is connected with an upper guide tube for guiding the linear up-and-down movement of the zero adjustment rod, the upper fixed block is provided with a through hole matched with the upper end of the zero adjustment rod, and the upper end of the zero adjustment rod is connected with a zero adjustment block for preventing the zero adjustment rod from being separated from the upper guide tube. The adjusting assembly comprises a tension spring sleeved on the outer side of the upper guide tube, and both ends of the tension spring are connected with the zero adjustment block and the upper fixed plate respectively.

2. The laser engraver of claim 1, wherein: Both the driving wheel and the intermediate wheel are rotating wheels, the rotating wheel comprises the connecting shaft, the connecting shaft is sleeved with a bearing, the bearing is sleeved with a sleeve ring, and the side surface of the sleeve ring is provided with friction lines.

3. The laser engraver of claim 2, wherein: The upper end surface of the upper fixed plate is provided with an upper sink hole covering the transverse moving groove of the fixed plate, and the lower end surface of the lower fixed plate is provided with a lower sink hole covering the transverse moving groove of the fixed plate, and the limiting member is correspondingly located in the upper sink hole or the lower sink hole.

4. The laser engraver of claim 3, wherein: The upper sink hole and the lower sink hole are arranged in a rectangular or waist shape for guiding the left-and-right movement of the limiting member.

5. The laser engraver of claim 1, wherein: The inner side surface of the upper guide tube is provided with a protrusion, and the middle upper part of the side surface of the zero adjustment rod is provided with a guide groove matched with the protrusion.

6. The laser engraver of claim 1, wherein: The upper end of the vertical base plate is provided with a sensing block, and the middle part of the sensing block is provided with a sensing hole matched with the zero adjustment block.

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