Laser etching jig

By designing a laser carving fixture with multiple accommodating grooves and removable covers, the complex structure and high cost of existing laser carving fixtures are solved, and efficient and accurate laser carving numbers of L-shaped sintered workpieces are achieved. Reduces operational difficulty and production costs.

CN222133802UActive Publication Date: 2024-12-10SHENZHEN ELEMENT TECH CO LTD
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Patent Information

Application Number
CN202323555720.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-25
Publication Date
2024-12-10
Estimated Expiration
2033-12-25

AI Technical Summary

Technical Problem

The existing laser engraving fixtures have complex structural design, high production cost, and low efficiency and inconvenient operation when facing L-shaped sintered workpiece products.

Method used

A radium engraving fixture is designed, which includes a main body and a cover plate, and a plurality of accommodation grooves are provided on the main body for accommodating the L-shaped workpiece. The cover plate can be covered on the side of the main body to make the surface of the laser engraving and The sides of the main body are flush and positioned and installed through bases, screws, positioning columns and magnetic parts, making it easy to perform laser engraving operations.

Benefits of technology

The radium carving fixture can simply install multiple L-shaped workpieces and perform radium carving numbers uniformly, which improves the speed and accuracy of radium carving numbers, reduces production costs, is easy to operate and has high accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a laser etching jig which comprises a main body and a cover plate, a plurality of containing grooves used for containing L-shaped workpieces are formed in the main body, and the containing grooves are formed in the two adjacent side faces of the main body; the cover plate is arranged on the side face, provided with the containing grooves, of the main body in a covering mode so that the to-be-laser-etched faces of all the L-shaped workpieces contained in the multiple containing grooves can be flush with the other side face provided with the containing grooves. According to the laser etching jig designed by the utility model, a plurality of L-shaped workpieces can be mounted and accommodated through the optimized design of the structure of the laser etching jig, and the to-be-laser-etched surfaces of the plurality of L-shaped workpieces are exposed, so that the L-shaped workpieces are uniformly subjected to laser etching numbering, the use effect is better, and the production efficiency is improved. The speed and the accuracy of laser carving and numbering on the specific surface of the sintered product can be effectively improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of laser engraving equipment, in particular to a laser engraving jig. Background Art

[0002] Metal Injection Molding (MIM) is a new type of metal parts processing technology formed by applying plastic injection molding technology to powder metallurgy. It is also a "near net forming" technology that combines multiple disciplines such as plastic forming technology, polymer chemistry, powder metallurgy technology and metal materials science. This technology not only has the advantages of fewer conventional powder metallurgy processes, no cutting or less cutting, and high economic benefits, but also overcomes the main shortcomings of traditional powder metallurgy products such as uneven material, low mechanical properties, thin walls that are difficult to form, and complex structures. It is suitable for mass production of small, precise, three-dimensionally complex metal parts and parts with special requirements.

[0003] In the actual application of the metal powder injection molding technology, the metal powder and the binder need to be mixed and kneaded into a feed material, and then the prepared feed material is injected into a green product of a specific shape through an injection machine, and then the injected green sample is subjected to acid degreasing treatment, and finally the acid degreasing sample is subjected to thermal degreasing and high-temperature sintering to obtain a sintered product with better performance. Among them, the obtained sintered product needs to be laser engraved with a number on its specific surface. Due to the product structure, it is difficult to place it on a plane for laser engraving operation, so it is necessary to manufacture a laser engraving fixture with a specific structure to complete this operation process.

[0004] In order to improve the speed and accuracy of laser engraving numbers on specific surfaces of sintered products and reduce labor costs, many laser engraving jigs have been designed and processed. However, the inventors have found that the existing laser engraving jigs have a relatively complex structure design, a high production cost, and often have low efficiency and inconvenient operation when laser engraving L-shaped sintered workpieces.

[0005] Therefore, there is an urgent need to design a laser engraving fixture that is simple to operate, high in efficiency, low in production cost and high in precision to solve this problem. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a laser engraving jig for laser engraving numbers on the specific surface of an L-shaped sintered workpiece product. The utility model has the advantages of simple operation, high efficiency, low production cost and high precision, and can effectively improve the speed and accuracy of laser engraving numbers on the specific surface of an L-shaped sintered workpiece product.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a laser engraving jig, comprising: a main body and a cover plate, wherein the main body is provided with a plurality of receiving grooves for accommodating L-shaped workpieces, and the receiving grooves are provided on two adjacent side surfaces of the main body; wherein the cover plate is provided on one side surface of the main body where the receiving grooves are provided, so that the surfaces to be laser engraved of all L-shaped workpieces accommodated in the plurality of receiving grooves are flush with the other side surface where the receiving grooves are provided.

[0008] Furthermore, the laser engraving jig described in the utility model also includes a base, the base is provided with a groove, and the main body is arranged in the groove.

[0009] Furthermore, in the laser engraving jig described in the utility model, the groove is a U-shaped groove.

[0010] Furthermore, the laser engraving jig described in the utility model also includes a screw, a fixing hole is provided in the groove, and a threaded hole is provided in the main body, and the screw passes through the fixing hole and is threadedly connected to the threaded hole.

[0011] Furthermore, in the laser engraving jig described in the utility model, the screw includes a nail rod and a nail cap, the nail rod of the screw passes through the fixing hole and is threadedly connected to the threaded hole, and the top cap of the screw is arranged in the fixing hole.

[0012] Furthermore, in the laser engraving jig described in the utility model, the main body and the cover plate are respectively provided with positioning columns and positioning holes matched with the positioning columns.

[0013] Furthermore, in the laser engraving jig described in the utility model, a first magnetic component is provided on the main body, and a second magnetic component adsorbed to the first magnetic component is provided on the cover.

[0014] Furthermore, in the laser engraving jig described in the utility model, the plurality of accommodating grooves are all provided on the upper side surface of the main body and a side surface adjacent to the upper side surface.

[0015] Furthermore, in the laser engraving jig described in the present invention, a plurality of the accommodating grooves are opened on the upper side surface of the main body in two rows, one row of the accommodating grooves is opened on the upper side surface of the main body and the left side surface adjacent to the upper side surface, and the other row of the accommodating grooves is opened on the upper side surface of the main body and the right side surface adjacent to the upper side surface.

[0016] Furthermore, in the laser engraving jig described in the utility model, the cover plate includes a left cover plate and a right cover plate, the left cover plate is covered on the left side surface of the main body, and the right cover plate is covered on the right side surface of the main body.

[0017] The beneficial effect of the utility model is that the laser engraving fixture optimizes its own structure, and can be installed to accommodate multiple L-shaped workpieces, and expose the surfaces to be laser engraved of multiple L-shaped workpieces, so as to uniformly laser engrave and number these L-shaped workpieces. When this laser engraving fixture is applied to the specific surface of the sintered product and laser engraved and numbered, it can accurately locate, is simple to operate, has extremely high efficiency, low production cost and high precision, and can effectively improve the speed and accuracy of laser engraving and numbering on the specific surface of the sintered product. It has a better use effect and has good promotion prospects and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the laser engraving jig described in the utility model in one embodiment.

[0019] Figure 2 This is a structural explosion diagram of the laser engraving jig described in the utility model in one embodiment;

[0020] Figure 3 for Figure 2 The structural front view of the laser engraving jig shown;

[0021] Figure 4 It is a schematic structural diagram of the main body of the laser engraving jig described in the utility model under a viewing angle in an implementation mode;

[0022] Figure 5 It is a structural schematic diagram of the main body of the laser engraving jig described in the utility model under another viewing angle in one implementation manner;

[0023] Figure 6 A bottom view of the structure of the main body of the laser engraving jig described in the utility model in one embodiment;

[0024] Figure 7 This is a schematic structural diagram of a base of the laser engraving jig described in the utility model in one embodiment;

[0025] Figure 8 It is a structural schematic diagram of a base of the laser engraving jig described in the utility model under another viewing angle in one implementation mode;

[0026] Fig. 9 It is a structural schematic diagram of the left cover plate of the laser engraving jig described in the utility model in one embodiment.

[0027] Description of labels:

[0028] 1. Main body; 11. Accommodating groove; 12. Threaded hole; 13. Positioning column; 14. First mounting hole;

[0029] 2. Cover plate; 21. Left cover plate; 22. Right cover plate; 23. Positioning hole; 24. Second mounting hole;

[0030] 3. Base; 31. Groove; 32. Fixing hole;

[0031] 4. Screw; 41. Nail rod; 42. Nail cap;

[0032] 5. A first magnetic member;

[0033] 6. A second magnetic member;

[0034] 7. L-shaped workpiece. DETAILED DESCRIPTION

[0035] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0036] The inventors have found that the mainstream laser engraving jigs on the market have a complex structural design and a high production cost. In addition, when laser engraving L-shaped sintered workpieces, they are inefficient and inconvenient to operate.

[0037] To do this, please refer to Figures 1 to 9 As shown, the utility model designs a laser engraving jig, which includes: a main body 1 and a cover plate 2, wherein the main body 1 is provided with a plurality of receiving grooves 11 for accommodating L-shaped workpieces 7, and the receiving grooves 11 are provided on two adjacent side surfaces of the main body 1; wherein the cover plate 2 is covered on one side surface of the main body 1 on which the receiving grooves 11 are provided, so that the surfaces to be laser engraved of all the L-shaped workpieces 7 accommodated in the plurality of receiving grooves 11 are flush with the other side surface on which the receiving grooves 11 are provided.

[0038] In the above technical scheme of the present invention, the laser engraving jig has a completely new design for the structure of its main body 1, and a plurality of receiving grooves 11 for accommodating L-shaped workpieces 7 are opened on the main body 1, and the receiving grooves 11 are controlled to be opened on two adjacent sides of the main body 1, for example, the upper side and the left side; at this time, the operator can directly place the L-shaped workpiece 7 in the receiving groove 11, and use the cover plate 2 to cover one side with the receiving groove 11, for example, the left side; based on this arrangement, the L-shaped workpiece 7 can be fixed in the receiving cavity formed by the cover plate 2 and the receiving groove 11 of the main body 1, and at this time, the surfaces to be laser engraved of all the L-shaped workpieces 7 in the plurality of receiving grooves 11 can be flush with the other side with the receiving groove 11, that is, the upper side of the main body 1, to facilitate subsequent laser engraving process.

[0039] It can be seen that the laser engraving fixture designed by the utility model can install and accommodate multiple L-shaped workpieces 7 products at one time, and uniformly perform laser engraving numbers on these L-shaped workpieces 7 products. It can accurately locate, is simple to operate, has extremely high efficiency, low production cost and high precision, and can effectively improve the speed and accuracy of laser engraving numbers on specific surfaces of sintered products.

[0040] Moreover, in actual application, since the cover plate 2 is detachably connected to the main body 1, when the L-shaped workpiece 7 is laser engraved, the operator can directly remove the cover plate 2. At this time, multiple L-shaped workpieces 7 can be easily and conveniently removed from the main body 1. The disassembly method is simple and direct, and the use experience is better.

[0041] Furthermore, the laser engraving jig of the utility model further comprises a base 3 , the base 3 is provided with a groove 31 , and the main body 1 is arranged in the groove 31 .

[0042] Furthermore, in the laser engraving jig described in the utility model, the groove 31 is a U-shaped groove.

[0043] In the above technical scheme of the present invention, taking into account the actual use needs of users and ensuring the convenience of installation of the laser engraving jig, the laser engraving jig can also be provided with a base 3, which can be directly used for installation and matching with an external laser engraving machine; in actual application, a groove 31 can be opened on the above base 3 so that the main body 1 can be installed and set in the groove 31 accordingly, thereby achieving good positioning of the base 3 and the groove 31, and then facilitating subsequent laser engraving operations.

[0044] Furthermore, the laser engraving jig described in the utility model further includes a screw 4 , a fixing hole 32 is provided in the groove 31 , and a threaded hole 12 is provided in the main body 1 , and the screw 4 passes through the fixing hole 32 and is threadedly connected to the threaded hole 12 .

[0045] like Figure 6 and Figure 7 As shown, in the above technical solution of the present invention, according to the structural design of the main body 1 and the base 3, a fixing hole 32 can be specifically opened in the groove 31 of the base 3, and a threaded hole 12 can be opened in the main body 1, so that the screw 4 can pass through the fixing hole 32 in the above groove 31, thereby ensuring that the screw 4 can be threadedly connected with the threaded hole 12 in the main body 1, thereby achieving installation matching between the base 3 and the main body 1.

[0046] Furthermore, in the laser engraving jig described in the utility model, the screw 4 includes a nail rod 41 and a nail cap 42 , the nail rod 41 of the screw 4 passes through the fixing hole 32 and is threadedly connected to the threaded hole 12 , and the top cap of the screw 4 is arranged in the fixing hole 32 .

[0047] Furthermore, in the laser engraving jig described in the utility model, the main body 1 and the cover plate 2 are respectively provided with positioning posts 13 and positioning holes 23 matched with the positioning posts 13 .

[0048] In the above technical scheme of the utility model, in order to facilitate the relative positioning and matching between the above-mentioned main body 1 and the cover plate 2, in actual application, a plurality of positioning posts 13 can be provided on the main body 1, and positioning holes 23 corresponding to these positioning posts 13 can be provided on the cover plate 2, so that when the cover plate 2 is covered on the main body 1, the above-mentioned plurality of positioning posts 13 can be matched with the positioning holes 23 correspondingly, thereby realizing the relative positioning of the main body 1 and the cover plate 2.

[0049] Furthermore, in the laser engraving jig described in the utility model, a first magnetic component 5 is provided on the main body 1 , and a second magnetic component 6 adsorbed to the first magnetic component 5 is provided on the cover plate 2 .

[0050] Of course, after completing the positioning and matching of the cover 2 and the main body 1, in order to facilitate the operator to remove the cover 2, in some preferred embodiments of the present invention, the cover 2 and the main body 1 can be specifically controlled to be adsorbed, connected and matched in a magnetic manner, that is, a first magnetic component 5 can be set on the main body 1, and a second magnetic component 6 that is adsorbed with the above-mentioned first magnetic component 5 can be set on the cover 2.

[0051] When the cover plate 2 is positioned correspondingly and matched with the main body 1, the first magnetic member 5 and the second magnetic member 6 can be attracted to each other, thereby attracting the cover plate 2 to the main body 1, so that the cover plate 2 is not easily loosened from the main body 1. Of course, if the operator applies external force, it is easy to take the cover plate 2 off the main body 1, which can greatly simplify the operation of the operator to install and replace the L-shaped workpiece 7 set on the main body 1, thereby greatly optimizing the user experience.

[0052] Furthermore, in the laser engraving jig described in the present invention, the plurality of receiving grooves 11 are all provided on the upper side surface of the main body 1 and on a side surface adjacent to the upper side surface.

[0053] Furthermore, in the laser engraving jig described in the present invention, a plurality of the accommodating grooves 11 are opened on the upper side surface of the main body 1 in two rows, one row of the accommodating grooves 11 is opened on the upper side surface of the main body 1 and the left side surface adjacent to the upper side surface, and the other row of the accommodating grooves 11 is opened on the upper side surface of the main body 1 and the right side surface adjacent to the upper side surface.

[0054] Furthermore, in the laser engraving jig described in the present invention, the cover plate 2 includes a left cover plate 21 and a right cover plate 22 , the left cover plate 21 is covered on the left side surface of the main body 1 , and the right cover plate 22 is covered on the right side surface of the main body 1 .

[0055] Please refer to Figure 1-Figure 9 , Embodiment 1 of the present utility model is:

[0056] A laser engraving jig includes: a base 3, a main body 1, a left cover plate 21, a right cover plate 22, a cylindrical first magnetic member 5, a cylindrical second magnetic member 6, and a hexagon socket screw 4. The screw 4 includes a nail rod 41 and a nail cap 42 connected to each other.

[0057] See also Figure 2 , Figure 4 , Figure 5 and Figure 6 It can be seen that, in the present embodiment, ten receiving grooves 11 for receiving the L-shaped workpiece 7 are provided on the main body 1, and the receiving grooves 11 are provided on two adjacent side surfaces of the main body 1; wherein, in the present embodiment, all the receiving grooves 11 are provided on the upper side surface of the main body 1 and a side surface adjacent to the upper side surface, and these ten receiving grooves 11 are provided on the upper side surface of the main body 1 in two rows, that is, each row includes five receiving grooves 11, the five receiving grooves 11 in one row are provided on the upper side surface of the main body 1 and the left side surface adjacent to the upper side surface, and the five receiving grooves 11 in the other row are provided on the upper side surface of the main body 1 and the right side surface adjacent to the upper side surface.

[0058] In actual application, the ten receiving grooves 11 can all be used to receive the L-shaped workpiece 7, and after the L-shaped workpiece 7 is placed in the receiving groove 11, the operator can use the left cover plate 21 to cover the left side of the main body 1, and use the right cover plate 22 to cover the right side of the main body 1, so that the laser engraving surfaces of all the L-shaped workpieces 7 received in the plurality of receiving grooves 11 are flush with the upper side of the main body 1, thereby facilitating subsequent laser engraving. The structures of the left cover plate 21 and the right cover plate 22 are completely the same, and the structure of the left cover plate 21 can be seen in Fig. 9 .

[0059] like Fig. 9As shown, in this embodiment, the left cover plate 21 and the right cover plate 22 respectively installed on the left side and the right side of the main body 1 of the laser engraving jig are provided with two positioning holes 23 and two second mounting holes 24; correspondingly, two positioning posts 13 and two first mounting holes 14 are respectively provided on the left side and the right side of the main body 1 of the laser engraving jig. The positioning posts 13 are used to be aligned with the positioning holes 23, so that when the left cover plate 21 / right cover plate 22 is covered on the left side / right side of the main body 1, the positioning posts 13 on the main body 1 are correspondingly inserted into the positioning holes 23 of the cover plate 2, thereby ensuring the relative positioning between the cover plate 2 and the main body 1.

[0060] At the same time, after completing the positioning and matching of the cover 2 and the main body 1, in order to facilitate the operator to remove the cover 2, in this embodiment, the cover 2 and the main body 1 can be specifically controlled to be adsorbed and connected in a magnetic manner, that is, a first magnetic component 5 is set in the first mounting hole 14 opened on the left and right sides of the main body 1, and a second magnetic component 6 that is adsorbed with the above-mentioned first magnetic component 5 is set in the second mounting hole 24 of the left cover 21 and the right cover 22.

[0061] When the cover plate 2 is positioned correspondingly and matched with the main body 1, the first magnetic member 5 and the second magnetic member 6 can be attracted to each other, thereby attracting the cover plate 2 to the main body 1, so that the cover plate 2 is not easily loosened from the main body 1. Of course, if the operator applies external force, it is easy to take the cover plate 2 off the main body 1, which can greatly simplify the operation of the operator to install and replace the L-shaped workpiece 7 set on the main body 1, thereby greatly optimizing the user experience.

[0062] In addition, in this embodiment, two threaded holes 12 are further provided on the lower side of the main body 1 of the laser engraving jig. Both of the two threaded holes 12 extend in the vertical height direction and have internal threads therein.

[0063] Accordingly, if Figure 7 and Figure 8 As shown, in this embodiment, a groove 31 is provided in the middle of the upper side of the base 3, and the groove 31 is a U-shaped groove, and the groove 31 is used to install the main body 1, so that the main body 1 is arranged in the groove 31. Among them, two fixing holes 32 are also provided in the groove 31 of the base 3, and the two fixing holes 32 are arranged to allow the nail rod 41 of the hexagon socket screw 4 to pass through, but the nail cap 42 cannot pass through together.

[0064] To this end, in the present embodiment, the two fixing holes 32 are both set as stepped holes of equal size and shape; when the nail rod 41 of the screw 4 passes through the fixing hole 32 of the base 3 and is threadedly connected with the threaded hole 12 of the main body 1, the operator can control the top cap of the screw 4 to be screwed into the fixing hole 32 serving as the stepped hole, that is, the nail cap 42 is screwed into the fixing hole 32 at this time, so as to install the main body 1 on the base 3 and ensure that the fixture can be placed stably on a horizontal plane after assembly.

[0065] It should be noted that during actual installation and application, first, the base 3 is placed stably on the desktop, and then the main body 1 is installed on the groove 31 of the base 3. At this time, the upper surface of the groove 31 can fit together with the lower side of the main body 1. The operator fixes the base 3 and the main body 1 together with the hexagon socket screws 4. At this time, the assembly of the laser engraving jig is basically completed.

[0066] Next, turn the connected laser engraving jig upside down and place it steadily on the table, with the base 3 at the bottom and the main body 1 at the top. The operator can place the L-shaped workpiece 7 on the multiple receiving grooves 11 of the laser engraving jig in sequence. After all the receiving grooves 11 are filled with L-shaped workpieces 7, the left and right cover plates 2 can be simply and directly installed on the left and right sides of the main body 1 through the positioning columns 13 on the main body 1 and the positioning holes 23 on the left cover plate 21 / right cover plate 22. At this time, through the magnetic attraction of the first magnetic part 5 in the main body 1 and the second magnetic part 6 installed on the cover plate 2, the left cover plate 21 / right cover plate 22 can be tightly attached to the left and right sides of the main body 1. Finally, place the laser engraving jig under the laser engraving equipment for laser engraving. After the laser engraving is completed, remove the cover plate 2 and pour the L-shaped workpiece 7 of the completed laser engraving product into the material box to complete a laser engraving operation.

[0067] From the above, it can be seen that the laser engraving fixture designed by the utility model optimizes its own structure. It can install and accommodate multiple L-shaped workpieces, and expose the surfaces to be laser engraved of multiple L-shaped workpieces, so as to uniformly perform laser engraving numbering on these L-shaped workpiece products. When this laser engraving fixture is applied to the specific surface of the sintered product and laser engraved and numbered, it can accurately locate, is simple to operate, has extremely high efficiency, low production cost and high precision, and can effectively improve the speed and accuracy of laser engraving numbering on the specific surface of the sintered product. It has a good use effect and has a good prospect for promotion and application.

[0068] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A laser engraving jig, characterized in that: include: A main body and a cover plate, wherein the main body is provided with a plurality of receiving grooves for receiving L-shaped workpieces, and the receiving grooves are provided on two adjacent side surfaces of the main body; wherein the cover plate is provided on one side surface of the main body on which the receiving grooves are provided, so that the surfaces to be laser engraved of all L-shaped workpieces received in the plurality of receiving grooves are flush with the other side surface on which the receiving grooves are provided.

2. The laser engraving jig according to claim 1, characterized in that: It also includes a base, the base is provided with a groove, and the main body is arranged in the groove.

3. The laser engraving jig according to claim 2, characterized in that: The groove is a U-shaped groove.

4. The laser engraving jig according to claim 2, characterized in that: It also includes a screw, a fixing hole is provided in the groove, and a threaded hole is provided in the main body. The screw passes through the fixing hole and is threadedly connected with the threaded hole.

5. The laser engraving jig according to claim 4, characterized in that: The screw comprises a nail rod and a nail cap, the nail rod of the screw passes through the fixing hole and is threadedly connected with the threaded hole, and the top cap of the screw is arranged in the fixing hole.

6. The laser engraving jig according to claim 1, characterized in that: The main body and the cover plate are respectively provided with positioning posts and positioning holes matched with the positioning posts.

7. The laser engraving jig according to claim 1, characterized in that: The main body is provided with a first magnetic component, and the cover plate is provided with a second magnetic component which is attracted to the first magnetic component.

8. The laser engraving jig according to claim 1, characterized in that: The plurality of accommodating grooves are all disposed on the upper side surface of the main body and a side surface adjacent to the upper side surface.

9. The laser engraving jig according to claim 8, characterized in that: The plurality of accommodating grooves are arranged in two rows on the upper side surface of the main body, one row of the accommodating grooves is arranged on the upper side surface of the main body and the left side surface adjacent to the upper side surface, and the other row of the accommodating grooves is arranged on the upper side surface of the main body and the right side surface adjacent to the upper side surface.

10. The laser engraving jig according to claim 9, characterized in that: The cover plate comprises a left cover plate and a right cover plate, wherein the left cover plate is covered on the left side surface of the main body, and the right cover plate is covered on the right side surface of the main body.