Line drawing device for construction

Abstract

The utility model relates to the field of building construction equipment, in particular to a line drawing device for construction. Comprising a mold body and a supporting arm, cavities are formed in the mold body and the supporting arm, the cavities of the mold body are used for being filled with line drawing materials, the supporting arm is connected to the mold body, the cavities of the mold body can be communicated with the cavities of the supporting arm, the supporting arm is provided with a plurality of discharging openings, and the discharging openings are communicated with the mold body. The multiple discharging ports are all communicated with the cavity of the supporting arm, the projections of three discharging ports in the multiple discharging ports are located at the three end points of the same regular triangle respectively, the accuracy degree during regular triangle mark drawing is improved, then the construction quality is improved, and the reworking probability is reduced.

Description

Technical Field

[0001] The utility model relates to the field of construction equipment, and particularly relates to a line drawing device for construction. Background Art

[0002] In construction projects such as building construction, garden construction or road construction, spot ash spreading is an important step for marking the positions or ranges of various facility constructions. Traditional ash spreading methods are mostly manual operations, which are not only inefficient, but also difficult to accurately control the shape and size of the ash spreading. In particular, it is more difficult to draw marks such as equilateral triangle points, equally spaced points and parallel lines. The poor accuracy of the marked points leads to poor construction quality and an increase in the number of reworks. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiency in the prior art that the accuracy of drawing an equilateral triangle mark during the construction process is relatively poor, and to provide a line drawing device for construction.

[0004] The utility model provides a line drawing device for construction, which includes a mold body and a support arm. Cavities are provided inside both the mold body and the support arm. The cavity of the mold body is used for loading line drawing materials. The support arm is connected to the mold body. The cavity of the mold body can communicate with the cavity of the support arm. The support arm is provided with a plurality of discharge ports, and all the plurality of discharge ports communicate with the cavity of the support arm. The projections of 3 of the plurality of discharge ports are respectively located at the three endpoints of the same equilateral triangle.

[0005] By enabling the cavity of the mold body to communicate with the cavity of the support arm, the probability of the line drawing materials being evenly distributed in the cavity of the mold body and the cavity of the support arm can be increased, improving the working quality of the line drawing device. At the same time, only by loading the line drawing materials into the cavity of the mold body, instead of loading the cavities of the mold body and the support arm separately, the working efficiency of the line drawing device is improved; by providing discharge ports on the support arm, the line drawing materials in the cavity of the mold body can be discharged from the discharge ports through the cavity of the support arm. The relative positions of the discharge ports can be changed by moving the line drawing device or the support arm, and thus line drawing can be performed as needed, improving the flexibility of using the line drawing device; by making the projections of 3 of the plurality of discharge ports be respectively located at the three endpoints of the same equilateral triangle, when the line drawing materials are discharged from the discharge ports, the 3 discharge ports whose projections are located at the three endpoints of the equilateral triangle can project the three endpoints of the equilateral triangle in the line drawing target area. By connecting these three endpoints, an equilateral triangle mark can be obtained, improving the accuracy of drawing an equilateral triangle mark, thereby improving the construction quality and reducing the probability of rework. At the same time, by improving the accuracy of drawing an equilateral triangle mark, a perfect circle can be further drawn based on the equilateral triangle, thereby improving the accuracy of drawing a perfect circle.

[0006] Both the mold body and / or the support arms can be set as hollow members, or hollow members can be fixedly arranged inside the mold body and / or inside the support arms.

[0007] The support arms can be movably connected to the mold body, or can be connected to the mold body in a fixed connection manner.

[0008] The number of the discharge ports is at least 3, preferably 3, and can also be set to 4, 5, etc.

[0009] When the number of the discharge ports is greater than 3, during use, 3 discharge ports whose projections are at the three endpoints of the same equilateral triangle can be kept in an open state, and other discharge ports can be closed by components such as cover plates or wooden plugs, so that the line-drawing material is discharged from the 3 discharge ports to draw the three endpoints of the equilateral triangle.

[0010] The support arms include 3 support arm units, and one ends of the 3 support arm units are respectively connected to the mold body, and the other ends are respectively provided with discharge ports.

[0011] By setting 3 support arm units, each support arm unit is respectively provided with a discharge port, so that the total number of the discharge ports on the support arms is 3, and the projections are respectively located at the three endpoints of the same equilateral triangle, further improving the accuracy of the equilateral triangle drawn by the line-drawing device.

[0012] The mold body is a cylinder, the 3 support arm units are all sleeved on the mold body, the 3 support arm units can all rotate circumferentially around the mold body, and clamping portions are respectively arranged at the three equal division points of the mold body along the circumferential direction of the mold body, and the 3 clamping portions are respectively used for clamping the 3 support arm units to the mold body.

[0013] By setting that the support arm units can all rotate circumferentially around the mold body, the line-drawing device can adjust the positions of the support arm units according to requirements, and further adjust the distances between the discharge ports to complete the line-drawing work with different requirements, improving the adaptability of the device; by respectively arranging clamping portions at the three equal division points of the mold body along the circumferential direction of the mold body, each support arm unit can be respectively clamped to the mold body, and when each support arm unit is clamped to the mold body, the included angle between two adjacent support arm units is 60°, and the projections of each discharge port are respectively located at the three endpoints of the same equilateral triangle. Through this setting, the device can adjust the relative positions of the support arm units and can also be reset to make the projections of each discharge port be respectively located at the three endpoints of the same equilateral triangle, improving the flexibility of the device.

[0014] The mold body can also be set as a sphere, or can also be set as a cone, etc.

[0015] The boom unit is telescopic and is provided with scale lines.

[0016] With this setting, the boom unit can be telescoped according to the indication of the scale to adjust the length of the boom unit, so that the projections of the discharge ports can be located at the endpoints of the same equilateral triangle, and equilateral triangles of different sizes can be drawn as needed.

[0017] The boom includes an additional segment, which is correspondingly arranged with the boom unit. The additional segment is connected to the boom unit through a slide rail and can move along the length direction of the boom unit. Sliding the additional segment can change the length of the corresponding boom unit, and the discharge port is arranged on the additional segment.

[0018] By setting the additional segment, the length of the corresponding boom unit can be adjusted according to requirements, thereby changing the distance between the discharge ports, so that the projections of the discharge ports can be located at the endpoints of equilateral triangles of different sizes. By setting the slide rail, when the additional segment slides, the friction between the boom unit and the additional segment can be reduced, making the sliding smoother and reducing the probability of damage to the additional segment due to friction.

[0019] The additional segment can also be connected to the boom unit through a slider or a pulley.

[0020] The boom unit is also provided with a locking member for restricting the movement of the additional segment.

[0021] By setting the locking member, when the additional segment is adjusted to the position required for the operation of the device, the locking member is used to restrict the movement of the additional segment, reducing the probability of the additional segment moving during the operation of the device, thereby improving the accuracy of the device.

[0022] The locking member can be a bolt and a threaded hole provided on the additional segment, or can be set as a hook used in cooperation, etc.

[0023] The mold body is also provided with a driving device, which is communicated with the cavity of the mold body, and the driving device is used to drive the marking material to be discharged from the discharge port.

[0024] By setting the driving device, the driving device drives the marking material to be discharged from the discharge port, improving the convenience of using the device.

[0025] The driving device is an air pump, which is arranged inside the mold body and communicated with the cavity of the mold body. The air pump is provided with a grip rod and a pressure switch. The grip rod is slidably connected to the inner wall of the air pump, and moving the grip rod can compress air into the air pump. The pressure switch is connected to the air pump, and operating the pressure switch can make the air discharged from the air pump.

[0026] By setting the grip rod to be slidably connected to the inner wall of the air pump, and compressing air into the air pump by sliding the grip rod, the grip rod is integrally arranged in the air pump, reducing the volume of the device and making the device convenient to carry. At the same time, the grip rod is slidably connected to the air pump, reducing the friction between the grip rod and the air pump and improving the convenience during the air compression process. By setting a pneumatic switch, the air outlet of the air pump can be opened and closed as needed. When it is necessary to discharge the marking material, the pneumatic switch is opened, and the compressed air in the air pump enters the cavity of the mold body, driving the marking material to be discharged from the discharge port. When the pneumatic switch is closed, the flow of gas in the air pump to the cavity of the mold body is blocked. Through this setting, the pneumatic switch can be operated as needed to discharge the marking material from the discharge port or keep it in the cavity of the mold body, improving the flexibility of the device.

[0027] The driving device can also be set as a hydraulic pump or an electric air pump, etc.

[0028] The mold body is also provided with a handle.

[0029] By setting the handle, it is convenient to move and carry the device. The handle can be integrally arranged on the mold body or connected to the mold body in a detachable manner.

[0030] The mold body is also provided with a discharge port, and the discharge port is communicated with the cavity of the mold body.

[0031] By setting the discharge port on the mold body, other marks can be drawn according to actual needs, improving the applicability of the device.

[0032] Compared with the prior art, the beneficial effects of the present utility model are:

[0033] 1. The present utility model provides a line marking device for construction. By setting a mold body and a support arm, cavities are provided inside both the mold body and the support arm. The cavity of the mold body is used to fill the line marking material. The support arm is connected to the mold body, and the cavity of the mold body can be communicated with the cavity of the support arm. The support arm is provided with a plurality of discharge ports, and all the plurality of discharge ports are communicated with the cavity of the support arm. The projections of 3 of the plurality of discharge ports are respectively located at the three endpoints of the same equilateral triangle, improving the accuracy when drawing an equilateral triangle mark, thereby improving the construction quality and reducing the probability of rework. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the main schematic diagram of the line marking device for construction provided by Embodiment 1 of the present utility model.

[0035] Figure 2 It is the top view schematic diagram of the line marking device for construction provided by Embodiment 2 of the present utility model.

[0036] Figure 3 It is a bottom view schematic diagram of the first working state of the line-drawing device for construction in Embodiment 2 provided by the present utility model.

[0037] Figure 4 It is a bottom view schematic diagram of the second working state of the line-drawing device for construction in Embodiment 2 provided by the present utility model.

[0038] Figure 5 It is a bottom view schematic diagram of the third working state of the line-drawing device for construction in Embodiment 2 provided by the present utility model.

[0039] Figure 6 It is a bottom view schematic diagram of the fourth working state of the line-drawing device for construction in Embodiment 2 provided by the present utility model.

[0040] Markings in the figure:

[0041] 1 - Mold main body, 11 - Holding rod, 12 - Pneumatic switch, 13 - Handle, 2 - Support arm, 21 - Additional segment, 22 - Locking piece, 3 - First one-way valve, 4 - Second one-way valve, 5 - Soft plug, 6 - Discharge port. Specific embodiments

[0042] The present utility model will be further described in detail below in conjunction with specific embodiments. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0043] In the description of the specific embodiments of the present utility model without special instructions, the expression terms of the orientation or position relationship indicated by "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / device / device of the present utility model is habitually used. These terms of orientation or position relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship. Therefore, it should not be understood as a limitation to the present utility model.

[0044] In addition, when terms such as "horizontal", "vertical", "hanging", and "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel. Instead, it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in directions such as "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present utility model.

[0045] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0046] In addition, in the description of the embodiments of the present utility model, "several", "multiple", and "a plurality of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0047] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / limited, where terms such as "set", "installed", "connected", "coupled", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0048] Embodiment 1

[0049] As shown in the Figure 1 accompanying drawings, the line-drawing device for construction includes a mold body 1 and a support arm 2. Chambers are provided inside both the mold body 1 and the support arm 2. The chamber of the mold body 1 is used for loading line-drawing materials. The support arm 2 is connected to the mold body 1. The chamber of the mold body 1 can communicate with the chamber of the support arm 2. The support arm 2 is provided with a plurality of discharge ports 6. All of the plurality of discharge ports 6 communicate with the chamber of the support arm 2. Among the plurality of discharge ports 6, the projections of 3 discharge ports 6 are respectively located at the three endpoints of the same equilateral triangle.

[0050] By enabling the cavity of the mold body 1 to communicate with the cavity of the support arm 2, the probability of the line-drawing material being evenly distributed in the cavities of the mold body 1 and the support arm 2 can be increased, improving the working quality of the line-drawing device. At the same time, by only loading the line-drawing material into the cavity of the mold body 1 instead of loading the cavities of the mold body 1 and the support arm 2 separately, the working efficiency of the line-drawing device is improved; by providing a discharge port 6 on the support arm 2, the line-drawing material in the cavity of the mold body 1 can be discharged from the discharge port 6 through the cavity of the support arm 2. The relative position of the discharge port 6 can be changed by moving the line-drawing device or the support arm 2, and thus line-drawing can be carried out as required, improving the flexibility of the line-drawing device; by making the projections of 3 of the several discharge ports 6 respectively located at the three endpoints of the same equilateral triangle, when the line-drawing material is discharged from the discharge port 6, the 3 discharge ports 6 whose projections are located at the three endpoints of the same equilateral triangle can project the three endpoints of the equilateral triangle in the line-drawing target area. By connecting these three endpoints, an equilateral triangle mark can be obtained, improving the accuracy when drawing an equilateral triangle mark, thus improving the construction quality and reducing the probability of rework.

[0051] Both the mold body 1 and the support arm 2 are hollow members. The support arm 2 is fixedly connected to the mold body 1, and the number of the discharge ports 6 is 3.

[0052] The support arm 2 includes 3 support arm units. One ends of the 3 support arm units are respectively connected to the mold body 1, and the other ends are respectively provided with discharge ports 6.

[0053] By providing 3 support arm units, each support arm unit is respectively provided with a discharge port 6, so that there are a total of 3 discharge ports 6 on the support arm 2, and the projections of the discharge ports 6 are respectively located at the three endpoints of the same equilateral triangle, further improving the accuracy of the line-drawing device in drawing an equilateral triangle.

[0054] The support arm unit can be telescopic, and the support arm unit is provided with scale lines.

[0055] With this setting, according to the indication of the scale, the support arm unit can be telescoped to adjust the length of the support arm unit, so that the projections of the discharge ports 6 can be located at the endpoints of the same equilateral triangle, and equilateral triangles of different sizes can be drawn as required.

[0056] The support arm 2 includes an additional section 21. The additional section 21 is correspondingly arranged with the support arm unit. The additional section 21 is connected to the support arm unit through a slide rail. The additional section 21 can move along the length direction of the support arm unit. Sliding the additional section 21 can change the length of the corresponding support arm unit, and the discharge port 6 is arranged on the additional section 21.

[0057] By setting the additional section 21, the length of the corresponding arm unit can be adjusted according to requirements, thereby changing the distance between the discharge ports 6, so that the projections of the discharge ports 6 can be located at the endpoints of equilateral triangles of different sizes. By setting the slide rail, when the additional section 21 slides, the friction between the arm unit and the additional section 21 can be reduced, making the sliding smoother and reducing the probability of damage to the additional section 21 due to friction.

[0058] The arm unit is also provided with a locking member 22, and the locking member 22 is used to limit the movement of the additional section 21.

[0059] By setting the locking member 22, when the additional section 21 is adjusted to the position required for the device to work, the locking member 22 is used to limit the movement of the additional section 21, reducing the probability of the additional section 21 moving during the operation of the device, and thus improving the accuracy of the device.

[0060] The locking member 22 is a locking block that can snap the additional section 21 and the arm unit corresponding to the additional section 21 together.

[0061] The mold body 1 is also provided with a driving device, the driving device is communicated with the cavity of the mold body 1, and the driving device is used to drive the marking material to be discharged from the discharge port.

[0062] By setting the driving device, the driving device drives the marking material to be discharged from the discharge port, improving the convenience of using the device.

[0063] The driving device is an air pump, the air pump is arranged inside the mold body 1 and communicated with the cavity of the mold body 1. The air pump includes an air inlet chamber and an air storage chamber. The air inlet chamber is communicated with the air storage chamber through a first one-way valve 3, and the air storage chamber is communicated with the cavity of the mold body 1 through a second one-way valve 4. The first one-way valve 3 is used to limit the movement of gas from the air storage chamber to the air inlet chamber, and the second one-way valve 4 is used to limit the movement of gas from the cavity of the mold body 1 to the air storage chamber. The air pump is provided with a grip rod 11 and a pressure switch 12. The grip rod 11 is provided with a soft plug 5. The grip rod 11 is slidably connected to the inner wall of the air pump through the soft plug 5. Moving the grip rod 11 can compress air into the air pump, and operating the pressure switch 12 can discharge air from the air pump.

[0064] By setting the grip rod 11 to be slidably connected to the inner wall of the air pump, and compressing air into the air inlet chamber by sliding the grip rod 11, the grip rod 11 is integrally arranged in the air pump, reducing the volume of the device and making the device easy to carry. At the same time, the sliding connection between the grip rod 11 and the air pump reduces the friction between the grip rod 11 and the air pump, improving the convenience of the air compression process. By setting the first one-way valve 3, the gas can move from the air inlet chamber to the air storage chamber and the probability of gas backflow is reduced, improving the effect of compressing gas in the air storage chamber. By setting the second one-way valve 4, the gas can move from the air storage chamber to the cavity of the mold body 1 and the probability of gas backflow is reduced, thereby reducing the probability of the line-drawing material entering the air storage chamber and improving the service life of the air pump. By setting the air pressure switch 12 and connecting the air pressure switch 12 to the second one-way valve 4, the second one-way valve 4 can be switched on and off as needed. When it is necessary to discharge the line-drawing material, the air pressure switch 12 is opened, and the compressed air in the air pump enters the cavity of the mold body 1, driving the line-drawing material to be discharged from the discharge port. When the air pressure switch 12 is closed, the flow of the gas in the air pump to the cavity of the mold body 1 is blocked. Through this setting, the air pressure switch 12 can be operated as needed to discharge the line-drawing material from the discharge port or keep it in the cavity of the mold body 1, improving the flexibility of the device.

[0065] The mold body 1 is further provided with a handle 13.

[0066] By setting the handle 13, it is convenient to move and carry the device. The handle 13 can be integrally arranged on the mold body 1 or connected to the mold body 1 in a detachable manner.

[0067] Embodiment 2

[0068] As shown in the Figures 2 - 6 accompanying drawings, the difference between this embodiment and Embodiment 1 is that the mold body 1 is a cylinder, and the 3 arm units are all sleeved on the mold body 1. The 3 arm units can all rotate circumferentially around the mold body 1. At the three equal division points of the mold body 1 along the circumferential direction of the mold body 1, clamping parts are respectively provided, and the 3 clamping parts are respectively used to clamp the 3 arm units to the mold body 1.

[0069] By setting that the support arm units can all rotate circumferentially around the mold body 1, the line drawing device can adjust the positions of the support arm units according to requirements, and further adjust the distances between the discharge ports 6, so as to complete the line drawing work with different requirements and improve the adaptability of the device; by providing clamping parts at the trisection points of the mold body 1 along the circumferential direction of the mold body 1, each support arm unit can be respectively clamped to the mold body 1, and when each support arm unit is clamped to the mold body 1, the included angle between two adjacent support arm units is 60°, and the projections of the discharge ports 6 are respectively located at the three endpoints of the same equilateral triangle. Through this setting, the device can also be reset to make the projections of the discharge ports 6 respectively located at the three endpoints of the same equilateral triangle by adjusting the relative positions of the support arm units, which improves the flexibility of the device.

[0070] The mold body 1 is further provided with a discharge port 6, and the discharge port 6 is communicated with the cavity of the mold body 1.

[0071] By providing the discharge port 6 on the mold body 1, other marks can be drawn according to actual needs, which improves the applicability of the device.

[0072] As Figure 3 shown, in the first working state, two of the support arm units in the support arm 2 can be moved to overlap axially along the mold body 1, and the other support arm unit can be moved to form an included angle of 180° with the other two support arm units. The additional section 21 is extended to the farthest position. During operation, the air pump is operated to discharge the line drawing material from the discharge ports of the support arm 2 and the discharge port of the mold body 1. At the same time, the mold body 1 is moved, and three parallel lines or three equally spaced points can be drawn.

[0073] As Figure 4 shown, in the second working state, the three support arms 2 can be moved to overlap axially along the mold body 1, and the additional section 21 is shortened to the minimum position. During operation, the air pump is operated to discharge the line drawing material from the discharge ports of the support arm 2 and the discharge port of the mold body 1. At the same time, the mold body 1 is moved, and two parallel lines can be drawn.

[0074] As Figure 5 shown, in the third working state, the three support arms 2 can be moved to overlap axially along the mold body 1, and a part of the additional section 21 extends out of the support arm 2. During operation, the air pump is operated to discharge the line drawing material from the discharge ports of the support arm 2 and the discharge port of the mold body 1. At the same time, the mold body 1 is moved, and two parallel lines can be drawn.

[0075] As Figure 6 shown, in the fourth working state, the three support arms 2 can be moved to overlap axially along the mold body 1, and the additional section 21 is extended to the farthest position. During operation, the air pump is operated to discharge the line drawing material from the discharge ports of the support arm 2 and the discharge port of the mold body 1. At the same time, the mold body 1 is moved, and two parallel lines can be drawn.

[0076] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A line-drawing device for construction, characterized in that, It includes a mold body (1) and a support arm (2). Chambers are provided inside both the mold body (1) and the support arm (2). The chamber of the mold body (1) is used for filling line-drawing materials. The support arm (2) is connected to the mold body (1). The chamber of the mold body (1) can communicate with the chamber of the support arm (2). The support arm (2) is provided with a number of discharge ports, and all the discharge ports communicate with the chamber of the support arm (2). The projections of 3 of the discharge ports are respectively located at the three endpoints of the same equilateral triangle.

2. The line-drawing device for construction according to claim 1, characterized in that, The support arm (2) comprises 3 support arm units. One ends of the 3 support arm units are respectively connected to the mold body (1), and the other ends are respectively provided with discharge ports.

3. The line drawing device for construction according to claim 2, characterized in that, The mold body (1) is a cylinder. The 3 support arm units are all sleeved on the mold body (1). The 3 support arm units can all rotate circumferentially around the mold body (1). Clamping parts are provided at the three equal division points of the mold body (1) along the circumferential direction of the mold body (1), and the 3 clamping parts are respectively used for clamping the 3 support arm units to the mold body (1).

4. A line-drawing device for construction according to claim 2 or 3, characterized in that, The support arm unit can be telescopic, and the support arm unit is provided with scale lines.

5. The line drawing device for construction according to claim 4, characterized in that, The support arm (2) includes an additional section (21). The additional section (21) is arranged corresponding to the support arm unit. The additional section (21) is connected to the support arm unit through a slide rail. The additional section (21) can move along the length direction of the support arm unit. Sliding the additional section (21) can change the length of the corresponding support arm unit. The discharge port is arranged on the additional section (21).

6. The line drawing device for construction according to claim 5, characterized in that, The support arm unit is further provided with a locking member (22), and the locking member (22) is used to limit the movement of the additional section (21).

7. The line-drawing device for construction according to claim 4, characterized in that, The mold body (1) is further provided with a driving device. The driving device communicates with the chamber of the mold body (1), and the driving device is used to drive the line-drawing materials to be discharged from the discharge port.

8. A line-drawing device for construction according to claim 7, characterized in that, The driving device is an air pump. The air pump is arranged inside the mold body (1) and communicates with the chamber of the mold body (1). The air pump is provided with a grip rod (11) and a pneumatic switch (12). The grip rod (11) is slidably connected to the inner wall of the air pump. Moving the grip rod (11) can compress air into the air pump. The pneumatic switch (12) is connected to the air pump, and operating the pneumatic switch (12) can make the air be discharged from the air pump.

9. A line drawing device for construction according to claim 4, characterized in that, The mold body (1) is further provided with a handle (13).

10. A line-drawing device for construction according to claim 4, characterized in that, The mold body (1) is further provided with a discharge port, and the discharge port communicates with the chamber of the mold body (1).

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