Protection mechanism and CNC pipe bending machine

Abstract

The utility model discloses a protection mechanism and a CNC pipe bender, the protection mechanism comprises: two installation parts, which are respectively arranged on two opposite sides of the CNC pipe bender, each installation part is provided with a guide part, and the guide parts and the ground are arranged at intervals; the two protection devices correspond to the two mounting parts, each protection device is provided with a scanning device and a sliding part, the scanning devices are connected to the sliding parts, the sliding parts are connected with the guide parts of the corresponding mounting parts, and each scanning device faces the ground and can move relative to the guide parts through the sliding parts; wherein each scanning device is used for forming a light curtain, the light curtain is configured to move along with the corresponding scanning device, and a working area is defined between the two light curtains so that the CNC pipe bending machine can be located in the working area. The protection mechanism provided by the utility model can avoid mistaken intrusion events in the production process, improve the production efficiency and guarantee the production safety.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a protective mechanism and a CNC pipe bending machine. Background Technology

[0002] Currently, Computer Numerical Control (CNC) pipe bending machines are widely used in industrial production, but they have certain shortcomings in terms of operational safety. Existing safety measures for CNC pipe bending machines mainly rely on safety mats or floor-mounted scanners to ensure that the equipment stops when the operator enters the work area. Additionally, using two-hand start buttons to start the machine ensures that the operator has no direct contact with the equipment at the moment of startup, thus improving safety. However, these measures are not effective in preventing operators from unconsciously putting their hands into the work area during manual production, especially when handling abnormal process problems, leading to serious accidents that harm both personal safety and production. Existing safety measures, such as adding physical protection combined with light curtain protection, while improving safety, lead to a significant reduction in production efficiency and affect the product's market competitiveness.

[0003] Therefore, how to ensure operational safety without sacrificing production efficiency has become an urgent problem to be solved in the industry. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that existing CNC pipe bending machine safety measures cannot balance production efficiency and safety. This invention provides a safety mechanism and a CNC pipe bending machine that can ensure operational safety without sacrificing production efficiency.

[0005] To solve the above-mentioned technical problems, the present invention discloses a protective mechanism, comprising: two mounting portions, respectively disposed on opposite sides of the CNC pipe bending machine along a first direction; each mounting portion having a guide portion extending along the first direction and spaced apart from the ground along a second direction, the first direction intersecting the second direction; and two protective devices corresponding to the two mounting portions, each protective device having a scanning device and a sliding portion; the scanning device being connected to the sliding portion, the sliding portion being connected to the guide portion of the corresponding mounting portion, and each scanning device being disposed facing the ground and capable of moving relative to the guide portion along the first direction via the sliding portion; wherein each scanning device is used to form a light curtain extending along a third direction, the light curtain being configured to follow the corresponding scanning device along the first direction; along the first direction, a working area is defined between the two light curtains to allow the CNC pipe bending machine to be located within the working area; the first direction intersects the third direction, and the second direction intersects the third direction.

[0006] Using the above technical solution, the embodiments of this application provide mounting parts on both sides of the main body, and place two scanning devices (e.g., security scanners) on the corresponding mounting parts, so that the scanning devices suspended on the mounting parts form a light curtain from top to bottom, and the worktable of the main body is located within the light curtains (e.g., infrared light curtains) on both sides.

[0007] Therefore, during the production process of the protective mechanism in this embodiment, when an operator outside the work area enters the work area to contact the protective mechanism, the operator will pass through the light curtain and be detected by the scanning device of this embodiment, thus stopping the operation of the protective mechanism and achieving safety protection for the operator.

[0008] Compared with the protection methods of existing safety carpets or scanners installed on the ground, this application embodiment, on the one hand, sets up scanning devices on both sides of the main body to form a light curtain from top to bottom on both sides of the workbench of the main body, thereby achieving accurate monitoring of operator intrusion behavior and completely avoiding the incident where the operator intrudes into the work area and affects the personal safety of the operator during the bending process of the protective mechanism of this application embodiment.

[0009] On the other hand, the scanning device of this application embodiment can move the guide part of the sliding part relative to the mounting part and make the light curtain move synchronously, so as to adjust the size of the working area between the light curtains on both sides of the main body according to the size of the bent tube product. Moreover, it does not require the installation of a large safety carpet or a light curtain formed on the ground, which can greatly reduce the operator's movement distance during work, improve production efficiency, and achieve a balance between production efficiency and safety.

[0010] According to another specific embodiment of the present invention, a protective mechanism is disclosed, wherein each of the mounting parts further includes a mounting bracket, each mounting bracket is used to be spaced apart from the CNC pipe bending machine, and two mounting brackets are arranged opposite to each other along the first direction, and one end of each mounting bracket is connected to the guide part.

[0011] According to another specific embodiment of the present invention, a protective mechanism is disclosed, wherein each of the mounting brackets includes a support section and an extension section, the support section extends along the second direction, the extension section extends along the third direction, one end of the extension section is connected to the support section, and the other end of the extension section is connected to the guide section.

[0012] According to another specific embodiment of the present invention, a protective mechanism is disclosed, wherein each of the sliding parts includes a fixing part and a connecting part. The connecting part is disposed on the side of the fixing part facing away from the scanning device. The connecting part is slidably connected to the guide part. The scanning device is connected to the fixing part. The fixing part can move relative to the guide part through the connecting part to drive the scanning device to move along the first direction.

[0013] According to another specific embodiment of the present invention, a protective mechanism is disclosed, wherein the fixing part includes a base, the connecting part includes a slider, and the guiding part includes a guide rail, the guide rail extending along a first direction; along a second direction, the base is disposed between the scanning device and the slider, the slider is slidably connected to the guide rail, the scanning device is connected to the base, and is slidably connected to the guide rail through the slider.

[0014] According to another specific embodiment of the present invention, a protective mechanism is disclosed. The slider includes a groove extending along the first direction. Along the third direction, each inner wall of the groove has a protrusion, and each side wall of the guide rail has a concave portion corresponding to the protrusion. The protrusion and the concave portion are in concave-convex fit, so that the groove is sleeved on the guide rail and slidably connected to the guide rail.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a protective mechanism, each of the protective devices further comprising an indicator device, the indicator device being connected to the fixing part and facing the ground, the protective mechanism further comprising an identification part corresponding to the indicator device, the identification part extending along the third direction and affixed to the ground; the indicator device is used to illuminate the identification part to form an indicator mark extending along the third direction, and along the second direction, the projection of each light curtain relative to the ground coincides with the projection of the corresponding indicator mark relative to the ground.

[0016] According to another specific embodiment of the present invention, a protective mechanism is disclosed, the protective mechanism further including a protective part, the protective part extending along the first direction, and the protective part being spaced apart in front of the CNC pipe bending machine along the third direction, the protective part and the two light curtains jointly defining the working area.

[0017] The present invention also discloses a CNC pipe bending machine, comprising: a body extending along a third direction and having a worktable; and a protective mechanism as described in any of the above embodiments, wherein the two mounting portions are respectively disposed on opposite sides of the body along the first direction, so that the worktable is located within the working area. Attached Figure Description

[0018] Figure 1 A perspective view of a CNC pipe bending machine according to an embodiment of the present invention is shown;

[0019] Figure 2 A perspective view showing two mounting portions and two protective devices of the protective mechanism according to an embodiment of the present utility model;

[0020] Figure 3 A perspective view of the protective device and guide rail of the protective mechanism according to an embodiment of the present invention is shown.

[0021] Figure 4 A top view of a CNC pipe bending machine according to an embodiment of the present invention is shown. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0028] In existing technologies, the safety measures for CNC pipe bending machines primarily rely on safety mats or floor-mounted scanners to ensure the equipment stops operating when an operator enters the work area. However, because the scanners on existing CNC pipe bending machines are installed on the ground, the safety mechanism is only triggered when the operator steps into the floor-mounted work area. When an operator is handling abnormal process issues, even without stepping into the floor-mounted work area, their hands may unconsciously reach into the CNC pipe bending machine, which will not trigger the existing safety mechanism, potentially leading to serious safety accidents. Furthermore, while adding physical safety features in conjunction with optical fiber protection can improve safety, it can significantly reduce production efficiency.

[0029] In order to ensure operational safety without sacrificing production efficiency, this application provides a CNC pipe bending machine 1, which installs a scanning device on the mounting part in a movable and suspended manner to avoid accidental intrusion during the production process, thereby improving the production efficiency of the CNC pipe bending machine and ensuring production safety.

[0030] refer to Figure 1 and Figure 2 and combined Figure 3 This application provides a CNC pipe bending machine 1. The CNC pipe bending machine 1 of this application includes a body 10 and a protective mechanism. The protective mechanism includes a mounting part 20 and a protective device 30, with the protective device 30 mounted on the mounting part 20, i.e., the mounting part 20 and the protective device 30 corresponding to each other. Exemplarily, the protective mechanism of the CNC pipe bending machine 1 of this application has two mounting parts 20 and two protective devices 30, but is not limited thereto. This application does not specifically limit the number of mounting parts 20 and protective devices 30. For ease of explanation, the following description uses the example of a protective mechanism including two mounting parts 20 and two protective devices 30 corresponding to the mounting parts 20.

[0031] Specifically, such as Figure 1 and Figure 2 as well as Figure 3 As shown in the figure, the body portion 10 of this application embodiment is along a third direction (e.g., Figure 1 , Figure 2 and Figure 3 Extending along the first direction (as shown in the X direction), the main body 10 has a worktable 11 for processing bent pipes (not shown in the figure). Figure 1 , Figure 2 and Figure 3 (As shown in the Y direction), the two mounting parts 20 are respectively provided on opposite sides of the main body 10. For example, the main body 10 is covered with a shell to prevent the operator from accidentally touching the internal equipment of the main body 10, and the worktable 11 is provided at one end of the main body 10 near the two mounting parts 20.

[0032] For example, the bottom of the body part 10 of the CNC pipe bending machine 1 in this application embodiment has four pulleys 101 to facilitate the relocation and movement of the CNC pipe bending machine 1, and the bottom of the worktable 11 also has a support bracket 111 to support the worktable 11.

[0033] Continue to refer to Figure 1 Each mounting part 20 is provided with a guide part 22. The guide part 22 extends along a first direction Y and along a second direction (e.g., Figure 1 The CNC pipe bending machine 1 is positioned at an interval from the ground (as shown in the Z direction). Exemplarily, the first direction Y (i.e., the width direction of the CNC pipe bending machine 1) is perpendicular to the third direction X (i.e., the length direction of the CNC pipe bending machine 1), and the second direction Z (i.e., the height direction of the CNC pipe bending machine 1) is perpendicular to the third direction X. The first direction Y is perpendicular to the second direction Z. Furthermore, this embodiment also includes two protective devices 30 corresponding to the two mounting portions 20. (Continue referring to...) Figure 2 Each protective device 30 has a scanning device and a sliding part 32. Each scanning device is connected to the sliding part 32, and the sliding part 32 is movably connected to the guide part 22 of the corresponding mounting part 20, so that each scanning device can move left and right relative to the guide part 22 in the first direction Y through the sliding part 32.

[0034] Exemplarily, each scanning device is connected upside down to the sliding part 32 so that the head of the scanning device is facing the ground. The scanning device in this embodiment is a security scanner 31, but is not limited to this, as long as it can be used to monitor the work area 312 (see Figure 4 Check for foreign objects (such as the operator's hands) entering the device. For ease of explanation, the following description uses a security scanner 31 as an example.

[0035] refer to Figure 4 and combined Figure 1 and Figure 2 Two security scanners 31 are spaced apart along a first direction Y. Each security scanner 31 emits infrared rays downward along a second direction Z to form a light curtain 311 extending along a third direction X. Since the security scanners 31 can move along the first direction Y under the action of external forces (such as the push force applied manually by the operator or the force applied automatically by the servo motor), the light curtain 311 formed by each security scanner 31 can move synchronously along the first direction Y with the security scanner 31.

[0036] In this embodiment, mounting portions 20 are provided on both sides of the main body 10, and two security scanners 31 are correspondingly mounted on the respective mounting portions 20, so that the security scanners 31 suspended on the mounting portions 20 form a light curtain 311 from top to bottom, and the worktable 11 of the main body 10 is located within the light curtains 311 on both sides. That is, a working area 312 is defined between the two light curtains 311 that are spaced apart along the first direction Y, and the worktable 11 is located within the working area 312.

[0037] like Figure 1 As shown, the CNC pipe bending machine 1 of this embodiment further includes a protective part 40. The protective part 40 extends along a first direction Y and is spaced apart along a third direction X in front of the worktable 11. Exemplarily, the protective part 40 of this embodiment is a vertically arranged protective net; however, it is not limited thereto. This embodiment does not specifically limit the structure of the protective part 40, as long as it can be used to prevent the operator from accidentally entering the work area 312. Thus, the protective part 40 and the light curtains 311 located on both sides of the worktable 11 together define the work area 312.

[0038] It is understood that, since the CNC pipe bending machine 1 of this embodiment is located within the working area 312, in actual production, the CNC pipe bending machine 1, the light curtains 311 on both sides, and the protective part 40 together define the actual working area 312 (e.g., Figure 4 (As shown in the dashed box area).

[0039] Therefore, during the production process of the CNC pipe bending machine 1 in this embodiment, when an operator located outside the work area 312 enters the work area 312 to contact the CNC pipe bending machine 1, the operator will pass through the light curtain 311 and be detected by the safety scanner 31 in this embodiment, thus stopping the operation of the CNC pipe bending machine 1 in this embodiment, thereby achieving safety protection for the operator.

[0040] Furthermore, compared with the protection methods of safety carpets or scanners installed on the ground in the prior art, on the one hand, the present application embodiment sets up safety scanners 31 on both sides of the main body 10 to form a light curtain 311 from top to bottom on both sides of the workbench 11 of the main body 10, thereby realizing accurate monitoring of the operator's intrusion behavior and completely avoiding the incident in which the operator intrudes into the work area 312 during the bending process of the CNC pipe bending machine 1 in the present application embodiment, which would affect the operator's personal safety.

[0041] On the other hand, the safety scanner 31 of this application embodiment can move relative to the guide part 22 of the mounting part 20 through the sliding part 32 and make the light curtain 311 move synchronously, so as to adjust the size of the working area 312 between the light curtains 311 on both sides of the body part 10 according to the size of the bent tube product. Moreover, there is no need to set up a safety carpet or a light curtain formed on the ground that takes up a large space. This can greatly reduce the distance the operator moves when working, improve production efficiency, and achieve a balance between production efficiency and safety.

[0042] The structure and working principle of the mounting part 20 and the protective device 30 of the present application embodiment will be described in detail below with reference to the accompanying drawings. For ease of explanation, the following description uses one mounting part 20 and a corresponding protective device 30 as an example.

[0043] refer to Figure 2 and Figure 3 and combined Figure 1 and Figure 4 The mounting portion 20 in this embodiment also includes a mounting bracket 21. For example, as shown... Figure 1 and Figure 2 As shown, the mounting brackets 21 and the main body 10 are spaced apart along the first direction Y, and the two mounting brackets 21 are arranged opposite each other along the first direction Y. One end 2101 of the mounting bracket 21 is connected to the guide part 22. However, the arrangement of the two mounting brackets 21 is not limited in this embodiment, as long as they can be used to install the protective device 30 to form a light curtain 311 on both sides of the main body 10. For example, the two mounting brackets 21 can also be staggered along the third direction X.

[0044] Specifically, such as Figure 2 As shown, the mounting bracket 21 includes a support section 211 and an extension section 212. The support section 211 extends along a second direction Z, and the extension section 212 extends along a third direction X. One end 21201 of the extension section 212 connects to the support section 211, and the other end 21202 of the extension section 212 connects to the guide section 22. Exemplarily, the mounting bracket 21 has a "7"-shaped suspension structure with one side suspended, so that the protective device 30 (e.g., the aforementioned security scanner 31) of this embodiment is suspended and mounted on the guide section 22 of the mounting section 20, ensuring that the protective device 30 does not interfere with the main body 10 or the operator's operating area (i.e., the area outside the working area 312), thus avoiding affecting the operator's operating efficiency.

[0045] Continue to refer to Figure 3 and combined Figure 2The sliding part 32 of the protective device 30 in this embodiment includes a fixing part and a connecting part. The connecting part is located on the side of the fixing part facing away from the security scanner 31, and the connecting part is slidably connected to the guide part 22. Exemplarily, the fixing part in this embodiment is a base 321, the connecting part is a slider 322, and the guide part 22 includes a guide rail 221. The guide rail 221 extends along the first direction Y and is fixedly disposed on the lower side of the guide part 22 facing the ground.

[0046] Specifically, such as Figure 2 and Figure 3 As shown, the security scanner 31 is connected to a plate-shaped base 321. The base 321 is positioned between the security scanner 31 and the slider 322 along the second direction Z. The slider 322 is slidably connected to the guide rail 221, allowing the base 321 to move relative to the guide rail 221 via the slider 322. This, in turn, causes the security scanner 31 to move left and right along the first direction Y, thereby adjusting the size of the working area 312 (e.g., the width W of the working area 312, see [reference]). Figure 4 ).

[0047] For example, the slider 322 includes a groove 3221 extending along the first direction Y. Along the third direction X, each inner wall 32211 of the groove 3221 has a protrusion 32212, and each side wall 2211 of the guide rail 221 has a recess 2212 corresponding to the protrusion 32212. The protrusion 32212 and the recess 2212 engage in a convex-concave fit, allowing the groove 3221 to be fitted onto the guide rail 221 and slidably connected to it. However, this embodiment does not specifically limit the connection structure of the fixing part and the connecting part, as long as it allows the security scanner 31 to move relative to the guide part 22 along the first direction Y. For example, the fixing part and the connecting part can also be driven by a servo motor to drive a ball screw, causing the security scanner 31 to move relative to the guide part 22 along the first direction Y, replacing manual movement by the operator and increasing convenience.

[0048] In addition, continue to refer to Figure 4 For example, the protective device 30 in this embodiment of the application further includes an indicator device. The indicator device in this embodiment is a laser indicator light (not shown in the figure), which is connected to a fixing part (such as the base 321 described above) and faces the ground. Furthermore, the CNC pipe bending machine 1 in this embodiment of the application also includes a marking part corresponding to the laser indicator light. The marking part in this embodiment of the application is a color mark, which extends along a third direction X and is affixed to the ground.

[0049] It is understood that the security scanner 31 emits an infrared light curtain 311 that is invisible to the human eye. Therefore, when the indicating device and the marking unit of this embodiment cooperate, that is, when the laser indicator light illuminates the color marking, an indicating marking 50 extending in the third direction X can be formed. Furthermore, along the second direction Z, the projection of each light curtain 311 relative to the ground coincides with the projection of the corresponding indicating marking 50 relative to the ground. That is, by cooperating with the indicating device and the marking unit, which are also mounted on the base 321, when the laser indicator light illuminates the color marking on the ground, the position of the resulting indicating marking 50 is the position of the light curtain 311 formed by the current security scanner 31.

[0050] Therefore, the present application embodiment, through the design of the indicator device and the marking part, indicates the effective range of the operator's work area 312 in a visible manner, which can prevent the operator from accidentally entering the work area 312 during the production process, triggering the light curtain 311, causing the CNC pipe bending machine 1 to stop running, and having an adverse impact on production efficiency.

[0051] In summary, the CNC pipe bending machine 1 of this application embodiment movably mounts the protective device 30 onto the mounting part 20 to form light curtains 311 located on both sides of the main body 10, and the positions of the light curtains 311 on both sides can be adjusted relative to the main body 10 to achieve size adjustment of the working area 312. Therefore, the CNC pipe bending machine 1 of this application embodiment can ensure operational safety without sacrificing production efficiency.

[0052] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A safeguard mechanism applied to a CNC pipe bender, characterized in that, The application relates to a protection device for a CNC pipe bending machine. The protection device comprises two installation parts arranged on opposite sides of the CNC pipe bending machine along a first direction, each of the installation parts is provided with a guide part extending along the first direction and spaced apart from the ground along a second direction, and the first direction intersects the second direction. The protection device further comprises two protection devices corresponding to the two installation parts, each of the protection devices is provided with a scanning device and a sliding part, the scanning device is connected to the sliding part, the sliding part is connected to the guide part of the corresponding installation part, and each of the scanning devices is arranged towards the ground and can move along the first direction relative to the guide part through the sliding part. Each of the scanning devices is used for forming a light curtain extending along a third direction, the light curtain is configured to move along the first direction with the corresponding scanning device, and between the two light curtains, a working area is defined along the first direction for arranging the CNC pipe bending machine, the first direction intersects the third direction, and the second direction intersects the third direction.

2. The guard mechanism of claim 1, wherein, Each of the installation parts further comprises an installation support, each of the installation supports is arranged spaced apart from the CNC pipe bending machine, and the two installation supports are arranged opposite to each other along the first direction, and one end of each of the installation supports is connected to the guide part.

3. The guard mechanism of claim 2, wherein, Each of the installation supports comprises a support section extending along the second direction and an extension section extending along the third direction, one end of the extension section is connected to the support section, and the other end of the extension section is connected to the guide part.

4. The guard mechanism of claim 3, wherein, Each of the sliding parts comprises a fixed part and a connecting part, the connecting part is arranged on the side of the fixed part away from the scanning device, the connecting part is slidably connected to the guide part, the scanning device is connected to the fixed part, and the fixed part can move relative to the guide part through the connecting part to drive the scanning device to move along the first direction.

5. The guard mechanism of claim 4, wherein, The fixed part comprises a base, the connecting part comprises a sliding block, and the guide part comprises a guide rail extending along the first direction. Along the second direction, the base is arranged between the scanning device and the sliding block, the sliding block is slidably connected to the guide rail, the scanning device is connected to the base and slidably connected to the guide rail through the sliding block.

6. The guard mechanism of claim 5, wherein, The sliding block comprises a groove extending along the first direction, each side inner wall of the groove has a convex part along the third direction, each side wall of the guide rail has a concave part corresponding to the convex part, and the convex part and the concave part are matched to allow the groove to be sleeved on the guide rail and slidably connected to the guide rail.

7. The guard mechanism of claim 4, wherein, Each of the protection devices further comprises an indicating device connected to the fixed part and arranged towards the ground, and the protection device further comprises an identification part corresponding to the indicating device, the identification part extends along the third direction and is attached to the ground. The indicating device is used for irradiating the marking part to form an indicating mark extending along the third direction, and along the second direction, the projection of each light curtain on the ground plane coincides with the projection of the corresponding indicating mark on the ground plane.

8. The guard mechanism of claim 1, wherein, The protection mechanism further comprises a protection part extending along the first direction, and the protection part is arranged in front of the CNC pipe bender along the third direction, and the protection part and the two light curtains jointly define the working area.

9. A CNC pipe bender characterized by, Comprise: A body part extending along the third direction, having a workbench; The protection mechanism according to any one of claims 1 to 8, wherein the two mounting parts are respectively arranged on opposite sides of the body part along the first direction, so that the workbench is located in the working area.

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