Operation method for accurately and rapidly placing workpiece into effective heating area of box-type resistance furnace

Abstract

The invention discloses an operation method for accurately and rapidly placing a workpiece into an effective heating area of a box-type resistance furnace, and relates to the field of metal material heat treatment. The laser marking technology is applied to heat treatment operation, the effective heating area range of the box-type resistance furnace is marked through laser, a reliable reference limit is provided for workers to place workpieces, the accuracy and efficiency of the workpiece placement position are improved, complex operation of manual measurement is reduced, the working efficiency is improved, and the device is simple in structure and convenient to operate. The use is simple and easy to learn and convenient for workers to operate.

Description

Technical Field

[0001] The invention relates to an operating method for heat treating a material using a box-type resistance furnace, and in particular to an operating method for accurately and quickly placing a workpiece into an effective heating zone of the box-type resistance furnace. Background Art

[0002] Box-type resistance furnace is a type of heat treatment furnace and the most widely used heating equipment in heat treatment workshops. It uses radiation heating to form a temperature field in the furnace, and can perform annealing, tempering, quenching, normalizing and other processes. The temperature in the furnace of a box-type resistance furnace is not equal everywhere. The effective heating area only accounts for 90% of the furnace volume, or even less. With the aging of the equipment, the effective heating area will also shrink. Only by placing the workpiece in the effective heating area can the effect and quality of the product heat treatment be guaranteed.

[0003] The effective heating zone is detected through testing. The measurement and inspection personnel only give a size range, and there is no obvious mark in the furnace. After the workpiece is placed in the furnace, it is necessary to use a tape measure to measure the distance between the edge of the workpiece and the furnace mouth, the left furnace wall, the right furnace wall, the rear furnace wall and the furnace top. Limited by the structure and size of the furnace body, among the five dimensions, only the distance between the workpiece and the furnace mouth can be accurately measured, and the measurement of the remaining four dimensions is inconvenient and inaccurate. Especially when the size of the workpiece is close to the effective heating zone, once the workpiece is placed inaccurately and exceeds the range of the effective heating zone, defective products will often appear, affecting the normal production. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses an operation method for placing a workpiece accurately and quickly into the effective heating zone of a box-type resistance furnace. Before loading the workpiece into the furnace, an auxiliary tooling can be installed at the furnace door, and the basic area of ​​the effective heating zone can be marked with laser rays by utilizing the characteristics of laser's strong directivity and propagation in a straight line. The positioning of the effective heating zone in the length direction of this method is calculated using trigonometric functions, and the positioning in the width and height directions is directly measured by the scale on the ruler. This operation method clearly shows the location area where the workpiece can be placed, and workers can quickly and accurately place the workpiece into the effective heating zone of the box-type resistance furnace, effectively ensuring the quality of the product after heat treatment and greatly increasing the number of qualified products.

[0005] An operating method for accurately and quickly placing a workpiece into an effective heating zone of a box-type resistance furnace, wherein the operating method mainly indicates the range of the effective heating zone with the aid of auxiliary tooling, wherein the auxiliary tooling consists of a cross-shaped laser marking device, a straight-line laser marking device 1, a straight-line laser marking device 2, a straight-line laser marking device 3, a horizontal ruler, a vertical ruler, an adjustable support 1, an adjustable support 2, an adjustable support 3, an adjustable support 4, and a guide rod. The specific operating steps are as follows: Step 1: Determination of the effective heating zone of the box-type resistance furnace: The distance from the starting point of the effective heating zone to the laser marker is L=h×tanα. The positioning of the effective heating zone in the length direction can be obtained by adjusting the angle α of the cross-shaped laser marker. The width of the effective heating zone is W=a+b. The width range of the effective heating zone can be displayed by adjusting the position of the straight-line laser marker 1 and the straight-line laser marker 2 on the horizontal ruler. Step 2: Open the door of the box-type resistance furnace, install the auxiliary tooling at the furnace mouth, install the two ends of the horizontal ruler on the fixed support 1 and the fixed support 2 respectively, insert the guide rod into the guide support 3, the fixed support 1, the fixed support 2 and the guide support 3 are welded on the furnace door track, the fixed support 1 is provided with a first fine-tuning knob; the fixed support 2 is provided with a second fine-tuning knob; wherein the two ends of the horizontal ruler are adjusted by the first fine-tuning knob and the second fine-tuning knob respectively for lateral displacement; Step 3: The cross-shaped laser marker is installed on the horizontal ruler through the adjustable support 1; turn on the cross-shaped laser marker, and align the vertical laser line emitted by the laser marker with the center line of the furnace by adjusting the left and right fine-tuning knobs 1 and 2 on the fixed support 1 and the fixed support 2, and then tighten the fine-tuning knobs 1 and 2 to fix the auxiliary tooling.

[0006] Step 4: According to the calculation in step 1, adjust the adjustable support 1 so that its pointer points to the angle α. At this time, the horizontal laser line of the cross laser marker shows the positioning of the effective heating area in the length direction; Step 5: The straight laser marking device 1 and the straight laser marking device 2 are respectively installed on the adjustable supports of the horizontal ruler, and the adjustable supports can slide on the horizontal ruler; adjust the positions of the straight laser marking device 1 and the straight laser marking device 2 on the horizontal ruler so that the distance between the straight laser marking device 1 and the straight laser marking device 2 is a+b=W, and a=b; turn on the straight laser marking device 1 and the straight laser marking device 2. At this time, the straight laser marking device 1 and the straight laser marking device 2 respectively emit two light beams, and the area between the two light beams is the width range of the effective heating area; Step 6: Adjust the position of the three straight laser markers on the vertical ruler so that their height is equal to the height of the effective heating zone. Turn on the three straight laser markers. The light beam it emits indicates the highest point of the effective heating zone. The space formed between the light beam and the furnace bottom plate is the height range of the effective heating zone.

[0007] Step 7: Place the workpiece into the furnace according to the instructions of the laser lines in steps 4, 5, and 6.

[0008] Furthermore, if the effective heating area is known and unchanged, steps 4, 5 and 6 can be omitted, or they can be adjusted to be completed before step 3, that is, the positions of the one-line laser marker 1, the two-line laser marker 2 and the three-line laser marker 3 are completed before the auxiliary marker is installed.

[0009] Furthermore, a cross-shaped laser marker is installed on an adjustable support one, a straight-line laser marker is installed on an adjustable support two, a straight-line laser marker is installed on an adjustable support three, and a straight-line laser marker is installed on an adjustable support four. Adjustable support one is fixed on a horizontal ruler, and the center line of the cross-shaped laser marker just passes through the 0 scale line of the horizontal ruler. Adjustable support two and adjustable support three are both installed on the horizontal ruler and can slide in the horizontal direction. Adjustable support four is installed on the vertical ruler and can slide in the vertical direction. The vertical ruler is perpendicular to the horizontal ruler, the horizontal ruler is flush with the upper edge of the furnace mouth, the vertical ruler is flush with the left edge of the furnace mouth, and the guide rod is perpendicular to the vertical ruler. The entire set of auxiliary tooling is installed on the furnace door guide rail through fixed support one, fixed support two, and fixed support three.

[0010] Furthermore, the in-line laser marking device 1 and the in-line laser marking device 2 emit in-line laser beams along the vertical direction, and the in-line laser marking device 3 emits a laser beam along the horizontal direction.

[0011] Furthermore, step 3: it is necessary to measure the center line of the furnace body and mark it on the furnace shell on the front of the furnace body as a reference for measuring the effective heating area.

[0012] Further, step 3: fine-tuning knob 1 and fine-tuning knob 2 need to be operated separately when adjusting the horizontal scale position, and the other knob is in a loose state. After the 0 scale line of the horizontal scale is adjusted to the center position of the furnace body, tighten the two knobs.

[0013] Furthermore, the 0 scale line of the horizontal ruler is located at the center of the ruler, and the digital scales increase successively on both sides. The laser marker is fixed at the 0 point position of the horizontal ruler, and the 0 scale line of the vertical ruler is flush with the upper surface of the furnace bottom plate, and the digital scales increase successively from bottom to top.

[0014] Furthermore, the laser marker is mounted on an adjustable support 1, the straight laser marker 1 (2) is mounted on an adjustable support 2, the straight laser marker 2 is mounted on an adjustable support 3; the straight laser marker 3 is mounted on an adjustable support 4; the adjustable support 1 rotates within a range of 0-90°, and has a pointer and a scale to display the rotation angle; the adjustable support 2 and the adjustable support 3 can slide left and right on the horizontal scale, and the adjustable support 4 can slide up and down on the vertical scale.

[0015] Furthermore, the adjustable support 2, adjustable support 3 and adjustable support 4 move along the scale, the front of the support is hollow, and there is a pointer in the center, the pointer and the laser beam are in the same plane, and the scale indicated by the pointer is the distance from the laser beam to the zero point.

[0016] Furthermore, the guide rod is used to maintain the stability of the posture of the entire set of auxiliary markers, further ensuring that the light beam emitted by the laser marker is in the horizontal direction without deflection.

[0017] Compared with the prior art, the present invention has achieved the following technical effects: 1. The present invention is applied to the heat treatment production of metal materials. The operation process is simple and convenient for workers to operate. The use of laser lines can intuitively display the actual range of the effective heating zone, providing a reliable basis for workers to place workpieces. The workpieces can be quickly and accurately placed in the effective heating zone of the box-type resistance furnace, solving the problem of inconvenient and inaccurate position measurement after the workpiece is placed, and avoiding unqualified product quality caused by unreasonable placement of parts.

[0018] 2. The design structure of the auxiliary tooling is simple, and it is easy to install and disassemble. The ruler and laser are used in the horizontal and vertical directions. It can be applied to the effective heating areas of different sizes of different box-type resistance furnaces, and it is also applicable to the situation where the effective heating area is reduced due to the aging performance attenuation of a box-type resistance furnace equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the present invention using laser marking to display the scope of the effective heating area; Figure 2 This is a schematic diagram of the positioning of the effective heating area in the length direction of the present invention; Figure 3 This is a schematic diagram of positioning the effective heating area in the width direction of the present invention; Figure 4 It is a schematic diagram of the height direction positioning of the effective heating area of ​​the present invention; Figure 5 It is a schematic diagram of the auxiliary tooling of the present invention installed at the furnace mouth; Figure 6 It is the auxiliary tooling of the present invention; Figure 7 The utility model relates to a fixed support and a fine adjustment knob of the present invention.

[0020] List of figure marks: 1-cross-shaped laser marker; 2-straight-line laser marker one; 3-straight-line laser marker two; 4-straight-line laser marker three; 5-horizontal ruler; 6-vertical ruler; 7-adjustable support one; 8-adjustable support two; 9-adjustable support three; 10-adjustable support four; 11-fine-tuning knob one; 12-fine-tuning knob one; 13-fixed support one; 14-fixed support one; 15-guide support three; 16-guide rod. DETAILED DESCRIPTION

[0021] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Example

[0022] like Figure 1 , 2 , 3, 4, 5 and 6, 7 show an operation method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace, using an auxiliary tooling, which is installed at the furnace mouth through a fixed support; the specific steps are as follows: Step 1: Determination of the effective heating zone of the box-type resistance furnace: The distance L from the starting point of the effective heating zone to the laser marker 1 is h×tanα. The positioning of the effective heating zone in the length direction can be obtained by adjusting the angle α of the cross-shaped laser marker 1. The width of the effective heating zone is W=a+b. The width range of the effective heating zone can be displayed by adjusting the positions of the straight-line laser marker 1 2 and the straight-line laser marker 2 3 on the horizontal ruler 5; Figure 3 ; The height dimension of the effective heating area is H=c, such as Figure 4 Step 2: Open the door of the box-type resistance furnace, install the auxiliary tooling at the furnace mouth, install the two ends of the horizontal ruler 5 on the fixed support 1 13 and the fixed support 2 14 respectively, insert the guide rod 16 into the guide support 3 15, the fixed support 1 13, the fixed support 2 14 and the guide support 3 15 are welded on the furnace door track, the fixed support 1 13 is provided with a first fine-tuning knob 11; the fixed support 2 14 is provided with a second fine-tuning knob 12; wherein the two ends of the horizontal ruler 5 are adjusted by the first fine-tuning knob and the second fine-tuning knob respectively for lateral displacement; Step 3: The cross-shaped laser marker 1 is installed on the horizontal ruler 5 through an adjustable support 1 7; turn on the cross-shaped laser marker 1, and align the vertical laser line emitted by the laser marker 1 with the center line of the furnace by adjusting the left and right fine-tuning knobs 11 and 12 on the fixed support 1 13 and the fixed support 2 14, and then tighten the fine-tuning knobs 11 and 12 to fix the auxiliary tooling.

[0023] Step 4: According to the calculation in step 1, adjust the adjustable support 7 so that its pointer points to the angle α. At this time, the horizontal laser line of the cross laser marker 1 shows the positioning of the effective heating area in the length direction; Step 5: The straight laser marking device 1 2 and the straight laser marking device 2 3 are respectively installed on the adjustable supports of the horizontal ruler 5, and the adjustable supports can slide on the horizontal ruler 5; adjust the positions of the straight laser marking device 1 2 and the straight laser marking device 2 3 on the horizontal ruler 5 so that the distance between the laser marking device 1 2 and the straight laser marking device 2 3 is a+b=W, and a=b; turn on the straight laser marking device 1 2 and the straight laser marking device 2 3. At this time, the straight laser marking device 1 2 and the straight laser marking device 2 3 respectively emit two light beams, and the area between the two light beams is the width range of the effective heating area; Step 6: Adjust the position of the straight laser marker 3 4 on the vertical ruler 6 so that its height is equal to the height of the effective heating zone. Turn on the straight laser marker 3 4. The light beam it emits indicates the highest point of the effective heating zone. The space formed between the light beam and the furnace bottom plate is the height range of the effective heating zone.

[0024] Step 7: Place the workpiece into the furnace according to the instructions of the laser lines in steps 4, 5, and 6.

[0025] This embodiment adopts the operating method proposed in this application, placing the workpiece into a box-type resistance furnace with an effective heating zone of 950mmx450mmx300mm. The furnace hearth size is 1590mmx885mmx625mm. The size of the workpiece to be heat treated is 700mmx400mmx200mm. The workpiece size is smaller than the size of the effective heating zone, so production can be carried out.

[0026] The auxiliary tooling is installed at the furnace mouth, the horizontal ruler 5 is installed on the fixed support 1 13 and the fixed support 2 14 , and the guide rod 16 is inserted into the guide support 3 15 .

[0027] Turn on the cross-shaped laser marker 1, and align the vertical laser line emitted by the laser marker 1 with the center line of the furnace by adjusting the left and right fine-tuning knobs 11 and 12 on the fixed support 13 and the fixed support 2 14, and then tighten the fine-tuning knobs 11 and 12 to fix the auxiliary tooling.

[0028] The depth of the furnace is 1590mm, and the size of the effective heating zone is 950mm, that is, the distance between the effective heating zone and the furnace mouth is 320mm, and the horizontal distance between the furnace mouth and the cross laser marker 1 is 295mm. Then the horizontal distance L between the effective heating zone and the cross laser marker 1 is 615mm. The height of the rotation center of the cross laser marker 1 from the furnace bottom plate is 400mm. tanα=615÷400=1.54, α≈57°. Turn the pointer of the adjustable support 7 to an angle of 57°. At this time, the horizontal laser line of the cross laser marker 1 displayed on the furnace bottom plate is the positioning reference of the length of the effective heating zone.

[0029] Adjust the positions of the straight laser marker 1 2 and the straight laser marker 2 3 on the horizontal ruler 5. The middle pointers of the adjustable supports point to 225mm around 0 o'clock. Tighten the locking knob to fix the laser marker. At this time, the distance between the two is exactly 450mm.

[0030] Adjust the position of the straight laser marker 3 4 on the vertical ruler 6, the middle pointer of the adjustable support points to 300mm, tighten the locking knob to fix the laser marker, at this time, the distance between the straight laser marker 3 4 and the furnace bottom plate is exactly equal to 300mm.

[0031] Turn on the cross laser marker 1, the straight laser marker 2, the straight laser marker 3, and the straight laser marker 3 4, and the following will appear: Figure 1 The prompt range shown pushes the workpiece into the range enclosed by the furnace beam.

[0032] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace, characterized in that: The operation method mainly indicates the range of the effective heating zone with the aid of auxiliary tooling, wherein the auxiliary tooling is composed of a cross-shaped laser marking device (1), a straight-line laser marking device 1 (2), a straight-line laser marking device 2 (3), a straight-line laser marking device 3 (4), a horizontal ruler (5), a vertical ruler (6), an adjustable support 1 (7), an adjustable support 2 (8), an adjustable support 3 (9), an adjustable support 4 (10), and a guide rod (16). The specific operation steps are as follows: Step 1: Determination of the effective heating zone of the box-type resistance furnace: The distance L between the starting point of the effective heating zone and the laser marker (1) is h×tanα. The positioning of the effective heating zone in the length direction can be obtained by adjusting the angle α of the cross-shaped laser marker (1). The width dimension W of the effective heating zone is a+b. The width range of the effective heating zone can be displayed by adjusting the positions of the straight-line laser marker 1 (2) and the straight-line laser marker 2 (3) on the horizontal ruler (5). Step 2: Open the door of the box-type resistance furnace, install the auxiliary tooling at the furnace mouth, install the two ends of the horizontal ruler (5) on the fixed support 1 (13) and the fixed support 2 (14) respectively, insert the guide rod (16) into the guide support 3 (15), the fixed support 1 (13), the fixed support 2 (14) and the guide support 3 (15) are welded to the furnace door track, the fixed support 1 (13) is provided with a first fine-tuning knob (11); the fixed support 2 (14) is provided with a second fine-tuning knob (12); wherein the two ends of the horizontal ruler (5) are adjusted by the first fine-tuning knob and the second fine-tuning knob respectively to perform lateral displacement; Step 3: wherein the cross-shaped laser marker (1) is mounted on the horizontal ruler (5) via the adjustable support 1 (7); the cross-shaped laser marker (1) is turned on, and the vertical laser line emitted by the laser marker (1) is aligned with the center line of the furnace by adjusting the left and right fine adjustment knobs 1 (11) and 2 (12) on the fixed support 1 (13) and the fixed support 2 (14); and then the fine adjustment knobs 1 (11) and 2 (12) are tightened to fix the auxiliary fixture; Step 4: According to the calculation in step 1, adjust the adjustable support 1 (7) so that its pointer points to the angle α. At this time, the horizontal laser line of the cross laser marker (1) shows the location of the effective heating zone in the length direction; Step 5: The straight-line laser marking device 1 (2) and the straight-line laser marking device 2 (3) are respectively mounted on the adjustable supports of the horizontal ruler (5), and the adjustable supports can slide on the horizontal ruler (5); the positions of the straight-line laser marking device 1 (2) and the straight-line laser marking device 2 (3) on the horizontal ruler (5) are adjusted so that the distance between the straight-line laser marking device 1 (2) and the straight-line laser marking device 2 (3) is a+b=W, and a=b; the straight-line laser marking device 1 (2) and the straight-line laser marking device 2 (3) are turned on. At this time, the straight-line laser marking device 1 (2) and the straight-line laser marking device 2 (3) respectively emit two light beams, and the area between the two light beams is the width range of the effective heating area; Step 6: Adjust the position of the straight laser marker 3 (4) on the vertical ruler (6) so that its height is equal to the height of the effective heating zone. Turn on the straight laser marker 3 (4). The light beam it emits indicates the highest point of the effective heating zone. The space formed between the light beam and the furnace bottom plate is the height range of the effective heating zone. Step 7: Place the workpiece into the furnace according to the instructions of the laser lines in steps 4, 5, and 6.

2. The method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace according to claim 1 is characterized in that: Steps 4, 5 and 6 can be omitted if the effective heating area is known and unchanged, or can be adjusted to be completed before step 3, that is, the positions of the straight-line laser marker 1 (2), the straight-line laser marker 2 (3) and the straight-line laser marker 3 (4) are adjusted before the auxiliary marker is installed.

3. The method of placing a workpiece into the effective heating zone of a box-type resistance furnace accurately and quickly according to claim 1, characterized in that: The cross-shaped laser marking device (1) is mounted on the adjustable support 1 (7), the straight-shaped laser marking device 1 (2) is mounted on the adjustable support 2 (8), the straight-shaped laser marking device 2 (3) is mounted on the adjustable support 3 (9), and the straight-shaped laser marking device 3 (4) is mounted on the adjustable support 4 (10). The adjustable support 1 (7) is fixed on the horizontal ruler (5), and the center line of the cross-shaped laser marking device (1) just passes through the 0 scale line of the horizontal ruler (5). The adjustable supports 2 (8) and 3 (9) are fixed on the horizontal ruler (5). ) are mounted on the horizontal scale (5) and can slide in the horizontal direction. The adjustable support four (10) is mounted on the vertical scale (6) and can slide in the vertical direction. The vertical scale (6) is perpendicular to the horizontal scale (5). The horizontal scale (5) is flush with the upper edge of the furnace mouth. The vertical scale (6) is flush with the left edge of the furnace mouth. The guide rod (16) is perpendicular to the vertical scale (6). The whole set of auxiliary tooling is mounted on the furnace door guide rail through the fixed support one (13), the fixed support two (14) and the fixed support three (15).

4. The method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace according to claim 1 or 2, characterized in that: The straight-line laser marking device 1 (2) and the straight-line laser marking device 2 (3) emit straight-line laser beams in a vertical direction, and the straight-line laser marking device 3 (4) emits a laser beam in a horizontal direction.

5. The method of placing a workpiece into the effective heating zone of a box-type resistance furnace accurately and quickly according to claim 1, characterized in that: Step 3: It is necessary to measure the center line of the furnace body and mark it on the furnace shell on the front of the furnace body as a reference for measuring the effective heating area.

6. The method of claim 1 for accurately and quickly placing a workpiece into an effective heating zone of a box-type resistance furnace, characterized in that: Step 3: Fine-tuning knob 1 (11) and fine-tuning knob 2 (12) need to be operated separately when adjusting the horizontal scale position, while the other knob is in the loose state. After the 0 scale line of the horizontal scale is adjusted to the center of the furnace body, tighten the two knobs.

7. The method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace according to claim 1 or 2, characterized in that: The 0 scale line of the horizontal ruler (5) is located at the center of the ruler, and the digital scales increase in sequence on both sides. The laser marking device (1) is fixed at the 0 point position of the horizontal ruler (5). The 0 scale line of the vertical ruler (6) is flush with the upper surface of the furnace bottom plate, and the digital scales increase in sequence from bottom to top.

8. The method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace according to claim 1 or 2, characterized in that: The laser marker (1) is mounted on an adjustable support (7), the straight laser marker (2) is mounted on an adjustable support (8), and the straight laser marker (3) is mounted on an adjustable support (9); the straight laser marker (4) is mounted on an adjustable support (10); the adjustable support (7) is rotatable within a range of 0-90°, and has a pointer and a scale to display the rotation angle; the adjustable support (8) and the adjustable support (9) can slide left and right on the horizontal scale (5), and the adjustable support (10) can slide up and down on the vertical scale (6).

9. The method for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace according to claim 6 is characterized in that: The adjustable support 2 (8), the adjustable support 3 (9) and the adjustable support 4 (10) move along the scale. The front of the support is hollow and has a pointer in the center. The pointer and the laser beam are in the same plane. The scale indicated by the pointer is the distance from the laser beam to the zero point.

10. According to the method of claim 2 for accurately and quickly placing a workpiece into the effective heating zone of a box-type resistance furnace, the guide rod (12) is used to maintain the stability of the posture of the entire set of auxiliary markers, and further ensure that the light beam emitted by the laser marker (4) is in the horizontal direction without deflection.

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