Lens group adjustment mechanism for welding mask and welding mask

Abstract

A lens group adjustment mechanism for a welding mask comprises a conveyor belt 1, a driving shaft 2, a driven shaft 3, and a lens group connection part 4 arranged inside the welding mask, wherein the conveyor belt 1 is made of a flexible material, extends along the inner wall of the welding mask, and its two ends are respectively sleeved on the driving shaft 2 and the driven shaft 3; both ends of the driving shaft 2 and the driven shaft 3 are installed inside the welding mask, and are arranged radially close to the inner wall of the welding mask; one end of the lens group connection part 4 is connected to the lens group, and the other end is fixedly connected to the surface of the conveyor belt 1. The present invention makes full use of the space between the welding mask and the wearer's head, minimizes interference to the wearer, and also avoids increasing the pressure on the wearer's head and neck due to the shift of the center of gravity of the welding mask due to the addition of a lens group adjustment mechanism; various deformations of the closed loop and the open loop of the conveyor belt adapt to different installation scenarios, avoid slipping of the conveyor belt, and keep the conveyor belt at an appropriate tightness at all times.

Description

Technical Field

[0001] The present invention generally relates to the field of welding helmets, and more particularly, to an adjustment mechanism for a welding helmet lens assembly and a welding helmet. Background Art

[0002] Welding masks are used to protect against occupational hazards from welding. They can protect the eyes and enable accurate positioning and efficient welding during welding. Welding masks generally have eye protection lenses installed on the mask shell. There are two common ways to install the lenses and the mask shell. One is that the lenses are directly installed on the mask shell, and the other is that the lenses are installed on the outer flap, which is set on the mask shell and flipped up as needed. Both methods have some problems. For example, after welding is completed, when it is necessary to check the welding effect or clean and grind the welding slag, for the first type of welding mask, the lens group is directly installed on the mask shell. If the welder looks directly through the lens group, the field of vision is relatively dark and not clear enough, and the operation is inconvenient; for the second type of welding mask, the lens group is installed on the outer flip cover. Since the lens group is generally heavy, as the outer flip cover is flipped up, the lens group and the outer flip cover generally move a large distance, and the center of gravity of the welding mask will move a large distance upward and outward to ensure the stability of the lens group position, which puts heavy pressure on the welder's head. The welder is uncomfortable to wear and easily gets tired. Moreover, as the outer flip cover is flipped up, the side of the lens group close to the eyes will be exposed to the outside. Once the welding slag splashes during the process of cleaning and grinding the welding slag, it is easy to damage the lens group, reduce the service life of the lens group, and affect the work.

[0003] In response to the above problems, patent 2018105922776 provides an inward-folding welding helmet, which includes a mask shell with a window, a lens group arranged on the window, and an outer protective sheet covering the window. The inward-folding welding helmet also includes an inward-folding component arranged on the mask shell and connected to the lens group, and the lens group is flipped on the inner side of the mask shell through the inward-folding component; wherein, the inward-folding component includes a knob arranged on the mask shell, a gear coaxially linked with the knob, a soft strip with a rack, and a slide groove arranged on the mask shell, the soft strip is arranged in the slide groove and connected to the lens group, when the knob rotates, the gear is driven to rotate, the gear is meshed with the rack, and the soft strip is driven to change its displacement, so that the lens group is flipped on the inner side of the mask shell. The present invention provides an inverted assembly that allows the lens group to be turned inside the inverted welding mask, which is easy to operate. The center of gravity of the inverted welding mask changes relatively little, which greatly reduces the pressure of the inverted welding mask and improves the comfort of wearing. The mask shell with a window also provides protection for the user when the lens group is removed. However, the inverted assembly structure of the rack structure is fixed and is not easy to adjust to a form that fits the mask shell, which takes up extra space. Therefore, it is necessary to develop a new welding mask to solve the problems existing in the prior art. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a lens group adjustment mechanism for a welding mask, comprising a conveyor belt 1, a driving shaft 2, a driven shaft 3, and a lens group connecting portion 4 arranged inside the welding mask, wherein the conveyor belt 1 is made of a flexible material, extends along the inner wall of the welding mask, and its two ends are respectively sleeved on the driving shaft 2 and the driven shaft 3; both ends of the driving shaft 2 and the driven shaft 3 are installed inside the welding mask and are arranged radially close to the inner wall of the welding mask; one end of the lens group connecting portion 4 is connected to the lens group, and the other end is fixedly connected to the surface of the conveyor belt 1.

[0005] According to one embodiment of the present invention, the lens assembly connecting portion 4 is hinged to the lens assembly.

[0006] According to one embodiment of the present invention, the lens group adjustment mechanism also includes an adjustment shaft 5, which is installed on the inner wall of the welding mask, located between the driving shaft 2 and the driven shaft 3, and is in sliding contact with the conveyor belt 1, and is used to adjust the position of the conveyor belt 1.

[0007] According to one embodiment of the present invention, there are one or more adjusting shafts 5 , and each adjusting shaft 5 is used to adjust one side of the conveyor belt 1 or to adjust two sides of the conveyor belt 1 at the same time.

[0008] According to one embodiment of the present invention, the surface of the adjusting shaft 5 that is in sliding contact with the conveyor belt 1 is a smooth curved surface, and the cross-section of the adjusting shaft 5 perpendicular to the shaft is in any one of the following shapes: circular, semicircular, or concave-moon shape.

[0009] According to one embodiment of the present invention, the conveyor belt 1 is annular, and two ends are respectively sleeved on the driving shaft 2 and the driven shaft 3.

[0010] According to one embodiment of the present invention, the conveyor belt 1 is annular, one end of the conveyor belt 1 is spirally wound around the driving shaft 2 , and the other end is sleeved on the driven shaft 3 .

[0011] According to one embodiment of the present invention, the conveyor belt 1 is a single-end open loop, and two joints at one end of the open loop are fixed on the driving shaft 2 at intervals and wound around the driving shaft 2 in opposite directions, and the other end is sleeved on the driven shaft 3.

[0012] According to one embodiment of the present invention, the conveyor belt 1 is a single-end open loop, and two joints at one end of the open loop are fixed on the driving shaft 2 at intervals and spirally wound on the driving shaft 2 in opposite directions, and the other end is sleeved on the driven shaft 3.

[0013] According to one embodiment of the present invention, the conveyor belt 1 is a double-ended open loop, and two joints located at one end of the driving shaft 2 are fixed on the driving shaft 2 at intervals, and are wound on the driving shaft 2 in opposite directions or in opposite spirals, and two joints located at one end of the driven shaft 3 are fixed on the driven shaft 3 at intervals, and are wound on the driven shaft 3 in opposite directions or in opposite spirals.

[0014] According to one embodiment of the present invention, the welding helmet comprises any one of the lens assembly adjustment mechanisms described above.

[0015] According to one embodiment of the present invention, the welding mask includes a sliding groove 7, and the side of the lens group includes a sliding block 6. The sliding groove 7 is located on the side in the sliding direction of the lens group; the sliding block 6 can be slidably embedded in the sliding groove 7.

[0016] The lens group adjustment mechanism of the present invention is arranged to fit the inner wall of the welding mask to make full use of the space between the welding mask and the wearer's head. On the other hand, the fit of each part to the inner wall of the welding mask minimizes interference to the wearer and avoids the increase in pressure on the wearer's head and neck due to the shift of the center of gravity of the welding mask caused by the addition of the lens group adjustment mechanism. The setting of the adjustment shaft makes the conveyor belt fit the inner wall of the welding mask more closely, further reducing the space occupied by the lens group adjustment mechanism. The various deformations of the closed loop and open loop of the conveyor belt adapt to different installation scenarios, avoid the conveyor belt from slipping, and keep the conveyor belt at an appropriate tightness at all times. The setting of the sliding groove further limits the inclination angle and position of the lens group to avoid adverse effects on the wearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a lens group adjustment mechanism for a welding mask;

[0018] Figure 2 It is a schematic diagram of different states of the mirror group;

[0019] Figure 3 is a schematic diagram of a lens group adjustment mechanism including an adjustment shaft;

[0020] Figure 4 It is a schematic diagram of the adjustment axis being one;

[0021] Figure 5 is a schematic diagram of adjustment shafts of different shapes;

[0022] Figure 6 It is a schematic diagram of a conveyor belt in a ring shape;

[0023] Figure 7 It is a schematic diagram of a conveyor belt spirally wound around a driving shaft;

[0024] Figure 8It is a schematic diagram of a conveyor belt that is a single-ended open loop;

[0025] Fig. 9 It is a schematic diagram of another type of conveyor belt that is a single-ended open loop;

[0026] Fig.10 is a schematic diagram of a conveyor belt configured as a double-ended open loop; and

[0027] Fig.11 A schematic diagram of a welding mask. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Reference numerals refer to components and technologies in the present invention so that the advantages and features of the present invention can be more easily understood when implemented in a suitable environment. The following description is a concretization of the claims of the present invention, and other specific implementations related to the claims that are not explicitly described also belong to the scope of the claims.

[0029] Figure 1 The present invention shows a schematic diagram of the overall structure of a lens assembly adjustment mechanism for a welding mask.

[0030] like Figure 1 As shown, a lens group adjustment mechanism for a welding mask comprises a conveyor belt 1, a driving shaft 2, a driven shaft 3, and a lens group connecting portion 4 located inside the welding mask, wherein the conveyor belt 1 is made of a flexible material, extends along the inner wall of the welding mask, and has two ends respectively sleeved on the driving shaft 2 and the driven shaft 3; both ends of the driving shaft 2 and the driven shaft 3 are installed inside the welding mask, and are arranged radially close to the inner wall of the welding mask; one end of the lens group connecting portion 4 is connected to the lens group, and the other end is fixedly connected to the surface of the conveyor belt 1.

[0031] The active shaft 2 is a shaft that can provide power for the movement of the lens assembly. Since the active shaft 2 is located at one end away from the lens assembly, it can be driven by an external knob or power device.

[0032] The driving shaft refers to a rotating shaft that can be connected to an external power source. In the present invention, the driven shaft and the driving shaft can be converted into each other. For example, the driven shaft is connected to a power source and becomes the driving shaft, and the driving shaft has no power source and becomes the driven shaft. According to one embodiment of the present invention, the driving shaft and the driven shaft can also be configured with power sources at the same time, for example, they can be configured with the same power source or connected to different power sources respectively.

[0033] The conveyor belt 1, the driving shaft 2, the driven shaft 3, and the lens group connecting part 4 are all arranged inside the welding mask, making full use of the space between the welding mask and the wearer's head, and are distributed along the inner wall of the welding mask, so that the center of gravity of the welding mask is almost the same as that of the existing helmet, avoiding the increase in pressure on the wearer's head and neck caused by the addition of a lens group adjustment mechanism causing the center of gravity of the welding mask to shift.

[0034] Figure 2 Different states of the mirror assembly are shown.

[0035] like Figure 2 As shown, the lens group is installed in the welding mask. When welding is required, the lens group is between the welding mask window and the wearer's eyes, as the first position A; when it is necessary to observe the front welding situation or other operations, the active shaft 2 is rotated, and the lens group adjustment mechanism moves the lens group from the first position A to the second position B, so that the wearer's eyes can directly observe the outside of the mask through the welding mask window. That is, the lens group adjustment mechanism can adjust the position of the lens group, including but not limited to displacement, angle, etc. When the lens group needs to return to the first position A from the second position B, the active shaft 2 can be reversed.

[0036] The lens group adjusting mechanism adjusts the position of the lens group by driving the driving shaft 2 to rotate and drive the conveyor belt 1 to move, and the conveyor belt 1 then drives the lens group connecting part 4 and the lens group to move.

[0037] The conveyor belt 1 is made of a flexible material, so that the conveyor belt 1 can fit the inner contour of the welding mask well, and can reduce the interference to the wearer as much as possible while utilizing the space between the welding mask and the wearer's head. The conveyor belt 1 has a certain width, and can keep the lens group stable when driving the lens group connection part 4 and the lens group to move.

[0038] The driving shaft 2 and the driven shaft 3 are arranged parallel or approximately parallel to each other to avoid interference between the two sides of the conveyor belt 1, and the two ends of the driving shaft 2 and the driven shaft 3 are rotatably connected to the inner wall of the welding mask, wherein a knob or a connecting drive device can also be set at the position where the driving shaft 2 is connected to the inner wall of the welding mask, and the driving shaft 2 is driven to rotate manually or automatically.

[0039] The locations where the driving shaft 2 and the driven shaft 3 are connected to the side wall of the welding mask can be set to be detachable connections. For example, one end of the driving shaft 2 passes through the welding mask and can be installed or removed from the connection with the welding mask, and its end points are fixed with screws.

[0040] The driving shaft 2 and the driven shaft 3 are arranged close to the inner wall of the welding mask in their respective radial directions, so as to fully utilize the space between the welding mask and the wearer's head while minimizing the interference to the wearer.

[0041] One end of the lens assembly connection part 4 is fixedly connected to the transmission belt and can move with the movement of the transmission belt. Riveting or other fixed connection methods can be adopted. Removable riveting is preferred in the present invention. The other end of the lens assembly connection part 4 is movably connected to the lens assembly, such as hinged. In this connection method, when hinged, the angle of the lens assembly can be relatively fixed by relying on the friction force of the hinge. At the same time, the movability of the hinge makes the angle of the lens assembly adjustable, so that the position and angle of the lens assembly can be adjusted at any time during the conversion between the first position A and the second position B to meet the needs of the wearer.

[0042] The present invention only uses the driving shaft 2, the driven shaft 3 and the flexible conveyor belt 1 as the main lens group adjustment structure, which can fully utilize the space between the welding mask and the wearer's head, and on the other hand, the fit of each part with the inner wall of the welding mask minimizes the interference to the wearer. The flexible conveyor belt 1 and the detachable connection mode of the driving shaft 2 and the driven shaft 3 make the maintenance and replacement of the present invention more convenient.

[0043] like Figure 1 As shown, the lens assembly connecting portion is hinged to the lens assembly. In addition to hinged connection, the lens assembly connecting portion 4 and the lens assembly can also be connected in various ways such as pivot connection and threaded connection, that is, both a movable connection and a fixed connection can be used. Among them, when a movable connection is used, it is necessary to form a friction force between the lens assembly connecting portion 4 and the lens assembly to maintain the lens assembly in a relatively stable position state when the lens assembly is in the first position A and the second position B.

[0044] Figure 3 A schematic diagram of a mirror group adjustment mechanism including an adjustment shaft is shown.

[0045] like Figure 3 As shown, the lens group adjustment mechanism also includes an adjustment shaft 5, which is installed on the inner wall of the welding mask, located between the driving shaft 2 and the driven shaft 3, and is in sliding contact with the conveyor belt 1, and is used to adjust the position of the conveyor belt 1.

[0046] The space between the welding mask and the wearer's head is not a straight space, and the inner wall of the welding mask usually has a certain curvature. In order to make the lens group adjustment mechanism fit the inner wall of the welding mask more closely, the present invention adopts an adjustment shaft 5, and the adjustment shaft 5 is arranged parallel to the driving shaft 2 or approximately parallel to the driving shaft 2, has a smooth curved surface, and is in sliding contact with the conveyor belt 1, so that two sides or one side of the conveyor belt 1 change direction between the driving shaft 2 and the driven shaft 3 to better fit the inner wall of the welding mask.

[0047] The adjusting shaft 5 can be configured as a rotatable cylindrical shaft, so as to reduce the friction between the conveyor belt 1 and the adjusting shaft 5 and reduce the hindrance to the movement of the conveyor belt 1 .

[0048] In the present invention, the arrangement of the adjustment shaft 5 enables the conveyor belt 1 to fit the inner wall of the welding mask more closely, further reducing the space occupied by the lens assembly adjustment mechanism.

[0049] There are one or more adjustment shafts 5. When one is used, the adjustment shaft 5 adjusts the positions of the two sides of the conveyor belt 1 at the same time. When two are used, each adjustment shaft 5 can be used to adjust one side of the conveyor belt 1; or each adjustment shaft is distributed at different positions along the conveyor belt to adjust the two sides of the conveyor belt 1 at the same time. Figure 3 As shown, there are two adjusting shafts 5, which respectively adjust the positions of the two sides of the conveyor belt 1.

[0050] The two sides of the conveyor belt 1 refer to two approximately parallel sides located between the driving shaft 2 and the driven shaft 3. When there are two adjustment shafts 5, the two sides can be adjusted separately to make it fit the inner wall of the welding mask more closely and reduce the space occupied. The adjustment shafts 5 can also be provided in plurality as needed to adjust the conveyor belt 1 at different positions.

[0051] According to one embodiment of the present invention, the inner wall of the mask corresponding to the two ends of the adjustment shaft is provided with adjustment grooves, and the two ends of the adjustment shaft are embedded in the adjustment grooves, so that the adjustment shaft can be adjusted along the adjustment shaft. This arrangement of the present invention not only makes the conveyor belt fit the inner wall of the mask more closely, but also plays a role in adjusting the tightness of the conveyor belt.

[0052] Figure 4 A schematic diagram showing one adjustment axis is shown.

[0053] like Figure 4 As shown, when the two sides of the conveyor belt 1 are staggered in a direction perpendicular to or approximately perpendicular to the driving shaft 2, only one adjustment shaft 5 needs to be set at the same position to achieve simultaneous adjustment of the two sides of the conveyor belt 1. Further, in this case, if it is necessary to adjust the two sides of the conveyor belt 1 at different positions, the number of adjustment shafts 5 can be increased as needed.

[0054] Figure 5 Schematic diagrams showing different shapes of adjustment shafts.

[0055] like Figure 5 As shown, the surface of the adjusting shaft 5 that is in sliding contact with the conveyor belt 1 is a smooth curved surface, and the cross-section of the adjusting shaft 5 perpendicular to the shaft is in any of the following shapes: circular, semicircular, or concave-moon shape.

[0056] The shape of the cross section of the adjustment shaft 5 can be flexibly selected according to the size of the space between the inner wall of the welding helmet and the wearer's head. When there are multiple adjustment shafts 5, only one shape can be selected at the same time, or a combination of different shapes can be used at the same time.

[0057] The various shapes of the adjustment shaft 5 of the present invention can be combined in different ways as needed. A concave-moon-shaped adjustment shaft 5 can be used in a location with relatively small space, and a circular-section adjustment shaft 5 can be used in a location with sufficient space. The conveyor belt 1 can be adjusted in a variety of ways to better fit the inner wall of the welding mask and reduce space occupation.

[0058] Figure 6 A schematic diagram showing a conveyor belt in the shape of an annular ring is shown.

[0059] like Figure 6 As shown, the conveyor belt 1 is annular, and its two ends are respectively sleeved on the driving shaft 2 and the driven shaft 3.

[0060] The conveyor belt 1 can be arranged in various forms, among which the annular arrangement can be directly sleeved on the driving shaft 2 and the driven shaft 3, which is simple to assemble and convenient to replace.

[0061] When the conveyor belt 1 is set in this form, the two sides of the conveyor belt 1 are parallel to each other in a direction perpendicular to the driving shaft 2. At this time, when an adjustment shaft 5 needs to be set, there are at least two adjustment shafts 5 for adjusting the positions of the two sides of the conveyor belt 1 respectively.

[0062] Figure 7 A schematic diagram showing a conveyor belt spirally wound around a driving shaft.

[0063] like Figure 7 As shown, the conveyor belt 1 is annular, one end of the conveyor belt 1 is spirally wound around the driving shaft 2, and the other end is sleeved on the driven shaft 3.

[0064] One end of the conveyor belt 1 is wound around the driving shaft 2, and when the driving shaft 2 rotates, one of the two edges is screwed into the driving shaft 2 and the other is screwed out, thereby achieving the purpose of the operation of the conveyor belt 1. When the conveyor belt 1 is set in this form, the two edges of the conveyor belt 1 are spaced apart from each other in a direction parallel to the driving shaft 2. At this time, when an adjustment shaft 5 is required, one adjustment shaft 5 can be set to adjust the positions of the two edges of the conveyor belt 1 at the same time. This method can reduce the number of adjustment shafts 5 and further reduce the space occupied by the lens group adjustment mechanism. In addition, this spiral winding avoids slippage between the conveyor belt 1 and the driving shaft 2.

[0065] Furthermore, a fixing point is set at the spiral winding of the conveyor belt, and the conveyor belt is fixed to the driving shaft 2 by riveting, screws, etc., so that the conveyor belt moves up and down as the driving shaft 2 rotates. This fixing method further avoids slipping between the conveyor belt 1 and the driving shaft 2.

[0066] Figure 8 A schematic diagram showing a conveyor belt as a single-ended open loop.

[0067] like Figure 8 As shown, the conveyor belt 1 is a single-end open loop, and two joints at one end of the open loop are fixed on the driving shaft 2 at intervals and wound around the driving shaft 2 in opposite directions, and the other end is sleeved on the driven shaft 3.

[0068] The two joints at one end of the open loop of the conveyor belt 1 are fixedly connected to the surface of the driving shaft 2 in opposite directions, and at least one of the joints is pre-wound on the driving shaft 2. When the driving shaft 2 rotates, one side of the transmission belt increases the number of windings on the driving shaft 2, and the increased latter circle is sleeved on the outer periphery of the previous circle. Each circle increases along the radial direction of the driving shaft, and the other side reduces the number of windings on the driving shaft 2, so as to achieve the purpose of the operation of the conveyor belt 1. In this embodiment, the two sides of the open-loop conveyor belt 1 are respectively wound around the connection points with the driving shaft 2. This embodiment is suitable for the case where there is sufficient space in the radial direction of the driving shaft 2.

[0069] The conveyor belt 1 of the present invention is open-looped, and one end of the open loop is fixedly connected to the surface of the driving shaft 2, and the two ends of the conveyor belt 1 are respectively wound around fixed points, and the effects are: avoiding slipping between the conveyor belt 1 and the driving shaft 2; the conveyor belt 1 is wound around the driving shaft 2 to form a larger circumference, and the lens group can be adjusted to the target position by turning a smaller number of circles; the number of winding circles at the two joints of the conveyor belt 1 wound on the driving shaft 2 can be pre-set, so as to adjust the tightness of the conveyor belt 1. In particular, when the lens group connection part 4 is detachably connected to the conveyor belt 1, when the conveyor belt 1 becomes loose after being used for a period of time (the transition shaft 5 can be adjusted to allow the conveyor belt to move forward), the number of winding circles of the above two connection points and the position where the lens group connection part 4 is connected to the conveyor belt 1 can be adjusted at the same time, so that the conveyor belt 1 is always in an appropriate tightness.

[0070] Fig. 9 A schematic diagram showing another type of conveyor belt that is a single-ended open loop is shown.

[0071] like Fig. 9 As shown, the conveyor belt 1 is a single-end open loop, and two joints at one end of the open loop are fixed on the driving shaft 2 at intervals and spirally wound on the driving shaft 2 in opposite directions, and the other end is sleeved on the driven shaft 3.

[0072] Two joints at one end of the open loop of the conveyor belt 1 are fixedly connected to the driving shaft 2 at a certain distance and are wound in a reverse spiral, and each turn of the reverse spiral is distributed along the axial direction, that is, from the axial direction of the driving shaft 2, one joint is wound clockwise and the other joint is wound counterclockwise. This embodiment is suitable for the case where the radial space of the driving shaft 2 is compact.

[0073] The conveyor belt 1 of the present invention is open-looped, and one end of the open loop is fixedly connected to the surface of the driving shaft 2, and the two ends of the conveyor belt 1 are respectively spirally wound around the fixed points, which has the following effects: preventing the conveyor belt 1 from slipping with the driving shaft 2; the number of windings at the two joints of the conveyor belt 1 wound on the driving shaft 2 can be preset, so as to adjust the tightness of the conveyor belt 1. In particular, when the lens group connection part 4 is detachably connected to the conveyor belt 1, when the conveyor belt 1 becomes loose after being used for a period of time (the transition shaft 5 can be adjusted to allow the conveyor belt to tighten), the number of windings at the above two connection points and the position where the lens group connection part 4 is connected to the conveyor belt 1 can be adjusted at the same time, so that the conveyor belt 1 is always in an appropriate tightness.

[0074] Fig.10 A schematic diagram showing a conveyor belt being arranged as a double-ended open loop.

[0075] like Fig.10 As shown, the conveyor belt 1 is a double-end open loop, and two joints located at one end of the driving shaft 2 are fixed on the driving shaft 2 at intervals, and are wound on the driving shaft 2 in opposite directions or in opposite spirals, and two joints located at one end of the driven shaft 3 are fixed on the driven shaft 3 at intervals, and are wound on the driven shaft 3 in opposite directions or in opposite spirals.

[0076] The conveyor belts respectively wound around the driving shaft 2 and the driven shaft 3 can simultaneously or separately adopt two methods: "increasing along the radial direction of the driving shaft" or "each turn of the reverse spiral is distributed along the axial direction".

[0077] This arrangement of the present invention makes the adjustment of the tightness of the conveyor belt more flexible, and avoids the problem of the rotation of the driving shaft and the displacement of the conveyor belt being out of sync.

[0078] Fig.11 A schematic diagram of a welding helmet is shown.

[0079] like Fig.11 As shown, the welding helmet includes the lens group adjustment mechanism described in any one of the above items.

[0080] The welding mask comprises a sliding groove 7 , and the side of the lens group comprises a sliding block 6 . The sliding groove 7 is located on the side in the sliding direction of the lens group; the sliding block 6 is slidably embedded in the sliding groove 7 .

[0081] The sliding groove 7 and the lens assembly connecting portion 4 jointly adjust the angle of the lens assembly, so that the tilt angle and position of the lens assembly are limited during the conversion process between the first position A and the second position B, thereby avoiding adverse effects on the wearer.

[0082] like Fig.11 As shown, the welding mask further comprises a accommodating bracket 8, wherein the accommodating bracket 8 is located inside the welding mask and is attached to the top wall of the welding mask, and is used to accommodate the lens assembly adjustment mechanism.

[0083] When the accommodating bracket 8 is present, the driving shaft, the driven shaft and the adjusting shaft can all be mounted on the accommodating bracket 8 .

[0084] The accommodating bracket 8 protects the lens group adjustment mechanism and isolates the lens group adjustment mechanism from the user's head, thereby reducing interference to the user wearing the lens group.

[0085] The lens group adjustment mechanism of the present invention is arranged to fit the inner wall of the welding mask to make full use of the space between the welding mask and the wearer's head. On the other hand, the fit of each part to the inner wall of the welding mask minimizes interference to the wearer and avoids the increase in pressure on the wearer's head and neck due to the shift of the center of gravity of the welding mask caused by the addition of the lens group adjustment mechanism. The setting of the adjustment shaft makes the conveyor belt fit the inner wall of the welding mask more closely, further reducing the space occupied by the lens group adjustment mechanism. The various deformations of the closed loop and the open loop of the conveyor belt 1 adapt to different installation scenarios, avoid the conveyor belt from slipping, and keep the conveyor belt at an appropriate tightness at all times. The setting of the sliding groove further limits the inclination angle and position of the lens group to avoid adverse effects on the wearer.

[0086] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation to the claims.

Claims

1. A lens assembly adjustment mechanism for a welding mask, characterized in that: It comprises a conveyor belt (1) arranged inside a welding mask, a driving shaft (2), a driven shaft (3), and a lens assembly connecting portion (4). The conveyor belt (1) is made of a flexible material, extends along the inner wall of the welding mask, and has two ends respectively sleeved on the driving shaft (2) and the driven shaft (3); Both ends of the driving shaft (2) and the driven shaft (3) are mounted inside the welding mask and are arranged close to the inner wall of the welding mask in the radial direction; One end of the lens group connecting portion (4) is connected to the lens group, and the other end is fixedly connected to the surface of the conveyor belt (1). The lens group connecting portion (4) is hinged to the lens group and further comprises an adjustment shaft (5). The adjustment shaft (5) is mounted on the inner wall of the welding mask, is located between the driving shaft (2) and the driven shaft (3), is in sliding contact with the conveyor belt (1), and is used to adjust the position of the conveyor belt (1).

2. The lens assembly adjustment mechanism according to claim 1, characterized in that: There are one or more adjustment shafts (5), and each adjustment shaft (5) is used to adjust one side of the conveyor belt (1) or to adjust two sides of the conveyor belt (1) at the same time.

3. The lens assembly adjustment mechanism according to claim 1, characterized in that: The surface of the adjustment shaft (5) that is in sliding contact with the conveyor belt (1) is a smooth curved surface, and the cross-section of the adjustment shaft (5) perpendicular to the shaft is in any of the following shapes: circular, semicircular, or concave-moon shape.

4. The lens assembly adjustment mechanism according to any one of claims 1 to 3, characterized in that: The conveyor belt (1) is annular, with two ends respectively sleeved on the driving shaft (2) and the driven shaft (3).

5. The lens assembly adjustment mechanism according to any one of claims 1 to 3, characterized in that: The conveyor belt (1) is annular, one end of the conveyor belt (1) is spirally wound around the driving shaft (2), and the other end is sleeved on the driven shaft (3).

6. The lens assembly adjustment mechanism according to any one of claims 1 to 3, characterized in that: The conveyor belt (1) is a single-end open loop, wherein two joints at one end of the open loop are fixed on the driving shaft (2) at intervals and are wound around the driving shaft (2) in opposite directions, and the other end is sleeved on the driven shaft (3).

7. The lens assembly adjustment mechanism according to any one of claims 1 to 3, characterized in that: The conveyor belt (1) is a single-end open loop, wherein two joints at one end of the open loop are fixed on the driving shaft (2) at intervals and are spirally wound on the driving shaft (2) in opposite directions, and the other end is sleeved on the driven shaft (3).

8. A welding helmet, characterized in that: A lens group and a lens group adjustment mechanism are installed in the welding helmet, and the lens group adjustment mechanism adopts the lens group adjustment mechanism described in any one of claims 1-7.

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