Line casting device, calibration tool and calibration system

Abstract

The invention provides a demarcation device, a calibration tool and a calibration system. The demarcation device comprises a shell, a pendulum body, a laser module and a counterweight part. The swing body is arranged in the shell. The laser module is arranged on the pendulum body. And the counterweight piece is arranged on the pendulum body and is arranged opposite to the laser module, the counterweight piece comprises a magnetic part, magnetic poles of the magnetic part are distributed in the radial direction of the counterweight piece, and the magnetic part is arranged to controllably drive the counterweight piece to rotate under the action of a magnetic field generated by a calibration tool located outside the shell so as to adjust the gravity center of the pendulum body. The counterweight part in the demarcation device is provided with the magnetic part, so that the counterweight part obtains magnetism, under the condition that the calibration tool is not in contact with the counterweight part, the magnetic structure can be used for applying torque to the magnetic part of the counterweight part, the counterweight part is driven to rotate to change the position of the counterweight part, and therefore the calibration tool can be used for calibrating the position of the counterweight part under the condition that the casing of the demarcation device is not disassembled. And the calibration work of the demarcation device is completed.

Description

Technical Field

[0001] This invention belongs to the field of line projector technology, specifically relating to a line projector, calibration tool, and calibration system. Background Technology

[0002] In fields such as building construction, interior decoration, and equipment installation, the laser beam is a commonly used measuring tool. It provides horizontal, vertical, or inclined baselines by emitting laser beams, offering precise positional references for construction operations. The pendulum of the laser beam is the core component that ensures its measurement accuracy. Its main function is to maintain the stability of the baseline axis during operation through a gravity balance mechanism.

[0003] However, in the actual use of the projector, due to the complex environment of the construction site, the equipment will inevitably be affected by external factors such as collisions, drops, and vibrations, which will disrupt the balance of the pendulum and cause accuracy deviations. At this time, it is necessary to adjust the counterweight to calibrate the projector, adjust the light output direction of the projector, and restore the measurement accuracy of the projector.

[0004] In existing line projectors, the counterweight is typically threaded onto the pendulum body or a specific component thereon. This design presents significant challenges in adjustment: Firstly, because the pendulum body is enclosed in the projector's casing, and given the projector's stringent internal sealing requirements, it's impossible to create openings in the casing to provide a channel for calibration tools to access the counterweight. Adjusting the counterweight requires disassembling the projector's casing, a cumbersome process that can easily damage the casing or internal wiring. Secondly, in some projectors, the counterweight is obstructed by surrounding structural components, making it inaccessible even after removing the casing. The entire pendulum body must be disassembled to adjust the counterweight, further complicating the adjustment process. Moreover, repeated disassembly and reassembly of the pendulum body can introduce assembly errors, further compromising the projector's accuracy.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a line projector that solves the problem of the difficulty in adjusting the counterweight of existing line projectors.

[0007] To achieve the above objectives, a specific embodiment of the present invention provides a line projector, which includes a housing, a pendulum, at least one laser module, and a counterweight. The pendulum is disposed inside the housing, and the laser module is disposed on the pendulum. The counterweight is disposed on the pendulum and positioned opposite to the laser module. The counterweight includes a magnetic part, the magnetic poles of which are radially distributed along the counterweight. The magnetic part is configured to controllably drive the counterweight to rotate under the influence of a magnetic field generated by a calibration tool located outside the housing, thereby adjusting the center of gravity of the pendulum.

[0008] In one or more embodiments of the present invention, the magnetic part of the counterweight is provided as an electromagnet.

[0009] In one or more embodiments of the present invention, the line projector further includes a battery for charging the magnetic part and a calibration switch disposed on the housing, the calibration switch being used to control the on / off state of the circuit between the magnetic part and the battery.

[0010] In one or more embodiments of the present invention, the line projector further includes a tube sleeved outside the counterweight, the counterweight being controllably moved along the tube under the action of the magnetic field generated by the calibration tool.

[0011] In one or more embodiments of the present invention, the outer shell includes a side shell adjacent to the counterweight, and an identification structure is provided on the outer wall of the side shell, the central axis of the identification structure coinciding with the central axis of the counterweight.

[0012] In one or more embodiments of the present invention, the pendulum body has a threaded hole, and the counterweight includes a main body portion threaded into the threaded hole and a stop portion disposed on the side of the main body portion facing the side shell, wherein the diameter of the stop portion is larger than the diameter of the main body portion.

[0013] In one or more embodiments of the present invention, the tube body is provided with internal threads, and the counterweight includes a main body part provided with external threads and a stop part provided on the side of the main body part facing the side shell. The external threads and internal threads are threadedly connected, and the diameter of the stop part is larger than the diameter of the main body part.

[0014] In one or more embodiments of the present invention, the laser module is a vertical laser module.

[0015] In one or more embodiments of the present invention, two laser modules are provided, and two counterweights are provided and are arranged opposite to each of the two laser modules.

[0016] On the other hand, a specific embodiment of the present invention also provides a calibration tool for calibrating the above-mentioned projection instrument. The calibration tool includes an operating component and a first calibration component disposed at the end of the operating component. The first calibration component is configured as a permanent magnet with magnetic poles distributed radially thereon.

[0017] In another aspect, a specific embodiment of the present invention also provides a calibration system, which includes a target, an image recognition device, and a calibration device. The target is used to receive laser light emitted by a laser projector, and the image recognition device is used to acquire the projected images formed on the target before and after the laser projector rotates at a preset angle, thereby determining the calibration angle and calibration direction of the counterweight. The calibration device is disposed opposite to the target and includes a drive unit and a second calibration element disposed on the drive unit. The second calibration element is configured as a permanent magnet with magnetic poles distributed radially thereon. The drive unit can controllably drive the second calibration element to rotate at a position close to the counterweight according to the calibration angle and calibration direction to adjust the center of gravity of the pendulum.

[0018] In one or more embodiments of the present invention, the calibration system further includes an optical path extension device, wherein the input end of the optical path extension device is used to receive the laser beam emitted by the projector, and the output end is used to project the laser beam after optical path extension onto the target.

[0019] Compared with the prior art, the counterweight inside the projector of the present invention has a magnetic part, which makes the counterweight magnetic. The calibration tool located outside the projector can apply torque to the magnetic part of the counterweight by using the magnetic structure without contacting the counterweight, thereby driving the counterweight to rotate and change its position. Thus, the calibration of the projector can be completed without disassembling the projector housing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the line projector in one embodiment of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the line projector and calibration tool in one embodiment of the present invention;

[0023] Figure 3 This is an internal structural diagram of the projector in one embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional structural diagram of the projector in one embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional structural diagram of the counterweight and calibration tool in one embodiment of the present invention;

[0026] Figure 6This is a three-dimensional structural diagram of the calibration system in one embodiment of the present invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the line projector and calibration device in one embodiment of the present invention.

[0028] Key reference numerals in the attached drawings: 100, Projector; 110, Housing; 111, Side Housing; 112, Marking Structure; 120, Swing Body; 121, Tube Body; 130, Laser Module; 131, First Laser Module; 132, Second Laser Module; 140, Counterweight; 141, Main Body; 142, Stop; 200, Calibration Tool; 210, Operating Component; 220, First Calibration Component; 300, Calibration System; 310, Workbench; 320, Target; 321, Projection Surface; 330, Image Recognition Device; 340, Calibration Device; 341, Drive Unit; 342, Second Calibration Component; 350, Optical Path Extension Device. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0030] In the description of this invention, it should be understood that the terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] Furthermore, the terms "second" and "first" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "second" or "first" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] As an important measuring tool, the counterweight of a line projector is usually installed inside the projector. When calibrating the line projector, the counterweight cannot be adjusted without disassembling the outer casing. It is necessary to disassemble the outer casing or even the main body of the mechanism to adjust the counterweight, which makes the calibration of the line projector very difficult and cumbersome.

[0033] To address the aforementioned problems, this invention proposes a line projector, aiming to solve the technical issues of difficult calibration and the need to disassemble the housing in existing line projectors. The core idea of ​​this invention is to eliminate the need for housing disassembly. By improving the adjustment method of the counterweight, a non-contact adjustment mechanism is adopted. The calibration tool, located outside the housing, does not contact the counterweight. Torque is applied to the counterweight under the obstruction of the housing, driving its rotation and changing its position. This allows for efficient calibration of the line projector without disassembling the housing, and also avoids the impact of frequent housing disassembly on the measurement accuracy.

[0034] Specifically, refer to Figures 1 to 5 As shown, an embodiment of the present invention provides a line projector 100, which includes a housing 110, a pendulum body 120, a laser module 130, and a counterweight 140. The pendulum body 120 is disposed inside the housing 110, and the laser module 130, used for emitting laser light, is disposed at a corresponding position on the pendulum body 120. On the side of the pendulum body 120 facing away from the laser module 130, the counterweight 140 is disposed on two opposite sides of the pendulum body 120, and the counterweight 140 has a magnetic part. In practical applications, a portion of the counterweight 140 can be made into a magnetic part, or the entire counterweight 140 can be made into a magnetic part.

[0035] To facilitate applying torque to the counterweight 140 and enabling it to move relative to the pendulum to adjust its position, the magnetic poles of the magnetic part of the counterweight 140 are distributed radially, rather than axially. Thus, when calibrating the projector 100, the calibration tool 200, located outside the housing 110, is placed close to the counterweight 140. The magnetic structure of the calibration tool 200 provides a magnetic field with its magnetic poles distributed radially. The N pole of the magnetic structure aligns with the S pole of the magnetic part of the counterweight 140, and the S pole of the magnetic structure of the calibration tool 200 aligns with the N pole of the magnetic part of the counterweight 140; the two attract each other and achieve a relatively stable state.

[0036] Next, the calibration tool 200 is rotated. Under the influence of the magnetic field, the relatively stable state of the calibration tool 200 and the counterweight 140 is broken. The magnetic poles of the magnetic part of the counterweight 140 and the magnetic structure of the calibration tool 200, which are opposite to each other, are no longer perfectly aligned, creating a misalignment angle. According to the principle of like poles repelling and unlike poles attracting, the N pole of the magnetic structure of the calibration tool 200 will repel the N pole of the magnetic part of the counterweight 140, and the N pole of the magnetic structure of the calibration tool 200 will attract the S pole of the magnetic part of the counterweight 140. These attractive and repulsive forces are off-axis, and they work together to generate a torque, driving the counterweight 140 to rotate with the calibration tool 200, thereby changing the position of the counterweight 140 and the center of gravity of the pendulum 120. Calibration of the projector 100 is achieved without direct contact with the counterweight 140.

[0037] Of course, in practical applications, under manual calibration, simply rotating the calibration tool 200 once is often insufficient to directly balance the counterweights on both sides of the pendulum 120, adjust the center of gravity of the pendulum 120, and complete the calibration of the projector 100. The actual calibration process usually requires repeatedly rotating the calibration tool 200 clockwise or counterclockwise until the counterweight 140 is moved to a position that allows the counterweights on both sides of the pendulum 120 to achieve balance, thus completing the calibration of the projector 100.

[0038] In one embodiment, reference is made to Figure 3 and Figure 4 As shown, the laser module 130 includes a first laser module 131 and a second laser module 132. Both the first laser module 131 and the second laser module 132 are vertical laser modules, and are used to emit vertical laser lines. Two counterweights 140 are provided. One counterweight 140 is located on opposite sides of the pendulum body 120 from the first laser module 131, and the other counterweight 140 is located on opposite sides of the pendulum body 120 from the second laser module 132.

[0039] Reference Figures 3 to 5 As shown, in order to allow the counterweight 140 to move relative to the pendulum 120 to adjust its position, a tube 121 is formed on the pendulum 120. The tube 121 and the first laser module 131 are disposed on opposite sides of the pendulum 120. The tube 121 is sleeved on the outside of the counterweight 140, and the counterweight 140 can move horizontally within the tube 121. In one embodiment, the counterweight 140 includes a main body 141 and a stop 142 that are integrally connected and coaxially arranged. The tube 121 has an internal thread on the side facing the main body 141, and the main body 141 has an external thread. The cooperation of the internal and external threads allows the counterweight 140 to move within the tube 121.

[0040] The tube 121 has a certain length, forming a structure similar to a lever arm. The tube 121 allows the counterweight 140 to be positioned relatively far from the pendulum 120. According to the lever principle, torque equals force multiplied by the length of the lever arm. Increasing the length of the lever arm allows even small movements of the counterweight 140 to produce larger torque changes, thereby enabling more precise adjustment of the center of gravity of the pendulum 120 and giving the first laser module 131 relatively high adjustment accuracy.

[0041] In one embodiment, a threaded hole is provided on the pendulum body 120, and the counterweight 140 is threaded into the threaded hole, thereby fixing it to the pendulum body 120. (Refer to...) Figure 5 As shown, the counterweight 140 is configured with a screw-like structure, comprising an integrally connected and coaxially arranged main body 141 and stop 142. The main body 141 is disposed within a threaded hole, and an external thread is provided on the circumference of the main body 141, which is threadedly connected to the internal thread in the threaded hole. The stop 142 is disposed on the side of the main body 141 facing away from the laser module 130. The diameter of the stop 142 is larger than the diameter of the main body 141, preventing the counterweight 140 from completely entering the threaded hole, limiting the maximum distance between the counterweight 140 and the shell wall of its corresponding outer casing 110, preventing the distance between the counterweight 140 and the shell wall of the outer casing 110 from being too large and reducing the torque applied to the counterweight 140 by the calibration tool 200, and ensuring that the calibration tool 200 can stably adjust the position of the counterweight 140.

[0042] Considering that the projector 100 generally has other magnetic structures installed inside, such as a first magnet set at the bottom of the pendulum 120, the first magnet reduces the swing amplitude of the pendulum 120 in the swing state and reduces the time for the pendulum 120 to return to the stationary state from the swing state.

[0043] In one embodiment, considering that the magnetic structure inside the projector 100 may interfere with the counterweight 140, the magnetic part of the counterweight 140 is set as an electromagnet. A separate calibration switch is provided on the housing 110 of the projector 100, and a battery is provided inside the housing 110. The calibration switch is used to control the battery inside the projector 100 to energize the magnetic part of the counterweight 140.

[0044] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, the outer casing 110 includes a side casing 111 adjacent to the counterweight 140. A marking structure 112 is provided on the outer wall of the side casing 111, and the central axis of the marking structure 112 coincides with the central axis of the counterweight 140. The marking structure 112 helps calibration personnel determine the approximate position of the counterweight 140, facilitating the rapid movement of the calibration tool 200 to a position close to the counterweight 140 and improving the calibration efficiency of the line projector 100.

[0045] Furthermore, the marking structure 112 can be configured as a groove structure, a sticker structure, a window structure made of transparent material, a paint coating, and a cross-scratch structure, etc. This application does not impose specific restrictions on the molding method and material of the marking structure 112. Any structure or component that can help calibration personnel quickly identify the approximate position of the counterweight 140 can be used as the marking structure 112.

[0046] Furthermore, considering that when the marking structure 112 is made of magnetic material, the marking structure 112 may exert magnetic attraction or repulsion on the counterweight 140, affecting the calibration accuracy of the line projector 100, it is generally not recommended to use magnetic material to make the marking structure 112.

[0047] Furthermore, the number of marking structures 112 is the same as the number of counterweights 140, and the two are set in a one-to-one correspondence.

[0048] When the line projector 100 needs to be calibrated, the calibration switch is turned on, the circuit between the battery and the magnetic part of the counterweight 140 is closed, the magnetic part of the counterweight 140 is energized and becomes magnetic, which makes it easier for the calibration tool 200 to adjust the position of the counterweight 140.

[0049] When the projector 100 is in working condition, that is, when the projector 100 does not need to be calibrated, the calibration switch mentioned above is turned off, the circuit between the battery and the magnetic part of the counterweight 140 is disconnected, the magnetic part of the counterweight 140 loses its magnetism, and at this time the magnetic structure inside the projector 100 will not exert force or torque on the counterweight 140, thus avoiding mutual interference between the two.

[0050] It should be noted that when the calibration accuracy of the line projector 100 is not very high, or when the line projector 100 has almost no magnetic structure inside, the magnetic part of the counterweight 140 can also be a permanent magnet instead of an electromagnet, which can appropriately reduce the manufacturing cost of the line projector 100.

[0051] In one embodiment, reference is made to Figure 2 , Figure 4 and Figure 5 As shown, one embodiment of the present invention provides a calibration tool 200, which can be manually operated by calibration personnel to calibrate the line projector 100 in the above embodiment.

[0052] Specifically, the calibration tool 200 includes an operating component 210 and a first calibration component 220 arranged approximately coaxially. The operating component 210 is non-magnetic and its structure is similar to a knob or rod, allowing the calibration personnel to control the calibration tool 200 and drive it to rotate at a certain angle. The first calibration component 220 has a roughly circular cross-section and is located at one end of the operating component 210. The first calibration component 220 is configured as a permanent magnet or electromagnet, and its magnetic poles are distributed radially.

[0053] Preferably, to reduce the operational difficulty of the calibration tool 200, the first calibration element 220 is a permanent magnet. Furthermore, the calibration tool 200 may not require components such as a battery, control switch, and power supply circuit as those provided with the first calibration element 220, thus reducing the manufacturing cost of the calibration tool 200.

[0054] In one embodiment, reference is made to Figure 6 and Figure 7 As shown, one embodiment of the present invention provides a calibration system 300, which can automatically calibrate the line projector 100 in the above embodiment without requiring calibration personnel to manually calibrate the line projector 100 using calibration tools 200.

[0055] Specifically, the calibration system 300 includes a workbench 310, a target 320, an image recognition device 330, and a calibration device 340. The target 320, the image recognition device 330, and the calibration device 340 are disposed on the workbench 310, with the target 320 and the calibration device 340 spaced apart, and the space between them is used to place the line projector 100.

[0056] The target 320 includes a projection surface 321 facing the calibration device 340. The projection surface 321 is used to receive laser rays emitted from the projector 100, which can form a dot-shaped projection image on the projection surface 321. The image recognition device 330 is used to acquire the dot-shaped projection image formed on the projection surface 321 by the laser rays emitted from the projector 100. The calibration device 340 includes a drive unit 341 and a second calibration element 342 disposed on the drive unit 341. The second calibration element 342 is a permanent magnet or electromagnet with magnetic poles distributed radially thereon. The drive unit 341 can drive the second calibration element 342 to move and rotate, bringing it closer to the counterweight 140 inside the projector 100, and driving the counterweight 140 to rotate by a corresponding angle.

[0057] The working principle of the above calibration system 300 is as follows:

[0058] First, place the line projector 100 between the target 320 and the calibration device 340, with the line projector 100, the target 320 and the calibration device 340 arranged roughly in a straight line.

[0059] When the projector 100 is activated, the horizontal laser module emits a horizontal laser beam, which forms a first projected image on the projection surface 321 of the target 320. The position information of the first projected image is obtained by the image recognition device 330.

[0060] The projector 100 is rotated at a preset angle. After the projector 100 is rotated at the preset angle, it should ensure that the laser beam emitted by the horizontal laser module can still be projected onto the projection surface 321 of the target 320, and a second projected image is formed on the projection surface 321 of the target 320. Then, the position information of the second projected image is obtained through the image recognition device 330.

[0061] Calculate the height difference between the first and second projected images. If the height difference is within the allowable error range, calibration of the projector 100 is not required. If the height difference is greater than the allowable error range, calibration of the projector 100 is required. In this case, the image recognition device 330 obtains the calibration angle and calibration direction corresponding to the counterweight 140 based on the height difference.

[0062] Once it is determined that the line projector 100 needs to be calibrated and the corresponding calibration angle and calibration direction are obtained, the calibration device 340 controls its drive unit 341 to move the second calibration piece 342 to a position close to the counterweight 140 and align the second calibration piece 342 with the marking structure 112. Then, the second calibration piece 342 is controlled to rotate according to the calibration angle and calibration direction, and the energized counterweight 140 is synchronously driven to rotate according to the calibration angle and calibration direction, and the counterweight 140 is driven to move to calibrate the line projector 100.

[0063] Of course, after completing the calibration, the above steps can be repeated to check the calibration results. If the height difference obtained during the check is within the allowable error range, it indicates that the projector 100 has been calibrated and its measurement accuracy has been restored. If the height difference obtained during the check is still greater than the allowable error range, it indicates that the projector 100 has not yet restored its measurement accuracy, and the above steps need to be followed to continue calibrating the projector 100.

[0064] It should be noted that the preset angle can generally be set to one of 180 degrees, 90 degrees, or 270 degrees. Of course, the specific value of the preset angle can also be adjusted according to the actual calibration situation, and its specific value is not limited to the values ​​listed above.

[0065] Preferably, a lookup table exists between the aforementioned height difference and the calibration angle and calibration direction. For example, the lookup table may contain the following: when the height difference is positive, the calibration direction is clockwise; when the height difference is negative, the calibration direction is counterclockwise. When the height difference is 1 mm, the calibration angle is 30°; when the height difference is 2 mm, the calibration angle is 60°. The calibration device 340 stores the data from the lookup table in its memory. When it obtains the specific value of the height difference, it can quickly read the data from the memory to obtain the calibration angle and calibration direction corresponding to the height difference, and control the calibration device 340 to drive the second calibration component 342 to rotate according to the calibration angle and calibration direction at a position close to the counterweight 140.

[0066] Of course, the information in the comparison table listed above is only a part of the information contained therein. The listed rotation direction, height value and angle value are only for illustrative purposes and should not be regarded as a limitation on the technical solution of this application.

[0067] Furthermore, the reference table is not limited to using specific size values ​​to represent the height difference. The number of scale lines can be used to represent the height difference. For example, multiple scale lines are set on the projection surface 321 of the target 320 according to the height direction. The scale lines are marked from bottom to top as -10, -9, ... -2, -1, 0, 1, 2 ... 9, 10. When the first projected image is located at the scale line 1 and the second projected image is located at the scale line -1, the height difference between the two can be recorded as 2. Then, the calibration angle and calibration direction corresponding to the height difference of 2 can be obtained from the reference table.

[0068] In one embodiment, reference is made to Figure 6 As shown, the calibration system 300 also includes an optical path extension device 350. The image recognition device 330 is located between the target 320 and the optical path extension device 350. The input end of the optical path extension device 350 is used to receive the laser beam emitted by the projector 100, and the output end is used to project the extended laser beam onto the projection surface 321 of the target 320. After extending the optical path of the laser beam, the optical path extension device 350 can amplify the tiny errors of the laser beam, making the originally invisible and imprecise tiny errors clearly visible and easy to measure after being projected onto the target 320. Thus, high-precision and high-efficiency calibration of the projector 100 can be achieved within a limited space.

[0069] In one embodiment, reference is made to Figure 6 and Figure 7 As shown, the drive unit 341 of the calibration device 340 is configured as a robotic arm that can be automatically controlled. The robotic arm drives the second calibration component 342 to move and rotate, thereby realizing the automatic calibration of the line projector 100.

[0070] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A line projector (100), characterized in that, The line projector (100) includes: Outer shell (110); The pendulum body (120) is disposed inside the outer shell (110); At least one laser module (130) is disposed on the pendulum body (120); A counterweight (140) is disposed on the pendulum (120) and is disposed opposite to the laser module (130). The counterweight (140) includes a magnetic part, the magnetic poles of which are distributed radially along the counterweight (140). The magnetic part is configured to controllably drive the counterweight (140) to rotate under the action of a magnetic field generated by a calibration tool located outside the housing (110) to adjust the center of gravity of the pendulum (120).

2. The line projector (100) according to claim 1, characterized in that, The magnetic part of the counterweight (140) is an electromagnet.

3. The line projector (100) according to claim 2, characterized in that, The line projector (100) also includes a battery for charging the magnetic part and a calibration switch provided on the housing (110), the calibration switch being used to control the circuit connection between the magnetic part and the battery.

4. The line projector (100) according to claim 1, characterized in that, The line projector (100) also includes a tube (121) sleeved outside the counterweight (140), and the counterweight (140) can be moved in a controlled manner along the tube (121) under the action of the magnetic field generated by the calibration tool.

5. The line projector (100) according to claim 1, characterized in that, The outer shell (110) includes a side shell (111) adjacent to the counterweight (140), and an identification structure (112) is provided on the outer wall of the side shell (111), the central axis of the identification structure (112) coincides with the central axis of the counterweight (140).

6. The line projector (100) according to claim 1, characterized in that, The pendulum (120) has a threaded hole, and the counterweight (140) includes a main body (141) threaded into the threaded hole and a stop (142) provided on the side of the main body (141) facing the side shell (111). The diameter of the stop (142) is larger than the diameter of the main body (141).

7. The line projector (100) according to claim 4, characterized in that, The tube body (121) is provided with an internal thread. The counterweight (140) includes a main body (141) with an external thread and a stop (142) provided on the side of the main body (141) facing the side shell (111). The external thread is threadedly connected to the internal thread, and the diameter of the stop (142) is larger than the diameter of the main body (141).

8. The line projector (100) according to claim 1, characterized in that, The laser module (130) is a vertical laser module.

9. The line projector (100) according to claim 1, characterized in that, Two laser modules (130) are provided, and two counterweights (140) are provided and are arranged opposite to each of the two laser modules (130).

10. A calibration tool (200) for calibrating a projector (100) as described in any one of claims 1 to 9, characterized in that, The calibration tool (200) includes an operating element (210) and a first calibration element (220) disposed at the end of the operating element (210), wherein the first calibration element (220) is configured as a permanent magnet with magnetic poles distributed radially thereon.

11. A calibration system (300) for calibrating a projector (100) as described in any one of claims 1 to 9, characterized in that, The calibration system (300) includes: A target (320) is used to receive the laser emitted by the laser projector (100); Image recognition device (330) is used to acquire the projected image formed on the target (320) before and after the line projector (100) rotates at a preset angle, and to determine the calibration angle and calibration direction of the counterweight (140); A calibration device (340) is disposed opposite to the target (320). The calibration device (340) includes a drive unit (341) and a second calibration element (342) disposed on the drive unit (341). The second calibration element (342) is a permanent magnet with magnetic poles distributed radially thereon. The drive unit (341) can controllably drive the second calibration element (342) to rotate at a position close to the counterweight (140) according to the calibration angle and calibration direction, so as to adjust the center of gravity of the pendulum (120).

12. The calibration system (300) according to claim 11, characterized in that, The calibration system (300) also includes an optical path extension device (350), the input end of which is used to receive the laser beam emitted by the projector (100), and the output end is used to project the laser beam after optical path extension onto the target (320).

Images