Building site planning and marking equipment

Abstract

The invention relates to the field of road construction, in particular to building site planning and marking equipment which comprises a hand push rod, a shell and walking wheels. The two walking wheels are coaxially distributed at intervals, and the shell is located between the two walking wheels and driven by the two driving pieces installed in the shell to rotate. Nozzles are mounted at the bottom of the shell; one end of the hand push rod is rotationally mounted on the shell and used for pushing the shell to move; a plurality of thimbles are arranged in the walking wheel in the circumferential direction, extend in the radial direction of the walking wheel and can move in the radial direction of the walking wheel; a trigger assembly is arranged between the hand push rod and the walking wheel, when the moving speed of the hand push rod pushed by an operator is not matched with the moving speed of the walking wheel, the trigger assembly enables the ejector pin to move to be flush with the peripheral face of the walking wheel, the moving resistance of the walking wheel is increased, and meanwhile the operator is reminded to adjust the moving speed of pushing the hand push rod. Therefore, the influence on the movement of the shell is reduced, and the scribing accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of road construction, and particularly to a building site planning marking device. Background Art

[0002] The line marking work on a building site is an important task in the pre-construction preparation, usually used to mark the construction area, the location of buildings, the road layout, the pipeline route, etc. The accuracy of line marking directly affects the quality and progress of subsequent construction. Commonly used line marking devices include four-wheel and two-wheel carts. The structure of the four-wheel cart is usually more complex and is suitable for sites that require higher precision or a large range. The two-wheel cart has a simple and light structure, but poor stability and is suitable for small sites or simple applications. Among them, the H-shaped two-wheel line marking cart usually requires an operator to push the hand push rod to assist in moving. This method depends on the operator's experience and has a low line marking accuracy. Summary of the Invention

[0003] The present invention provides a building site planning marking device to solve the problem of low line marking accuracy of the existing two-wheel line marking cart.

[0004] The following technical solutions are adopted for a building site planning marking device of the present invention: A building site planning marking device includes a hand push rod, a housing and traveling wheels; there are two traveling wheels, which are coaxial and spaced apart. The housing is located between the two traveling wheels. The rotating shafts of the two traveling wheels are both horizontal and rotatably installed in the housing, and are respectively driven to rotate by two driving members installed in the housing; a nozzle is installed at the bottom of the housing; one end of the hand push rod is rotatably installed on the housing for pushing the housing to move; a plurality of ejector pins are arranged circumferentially around the traveling wheels, and the ejector pins extend along the radial direction of the traveling wheels and can move along their radial directions; a trigger assembly is arranged between the hand push rod and the traveling wheels. When the moving speed of the operator pushing the hand push rod does not match the moving speed of the traveling wheels, the trigger assembly makes the ejector pins move to be flush with the outer peripheral surface of the traveling wheels, increasing the moving resistance of the traveling wheels while reminding the operator to control the moving speed of pushing the hand push rod.

[0005] Optionally, the horizontal direction perpendicular to the rotation axis of the walking wheels is the first direction; a connecting shaft is installed inside the housing, and the connecting shaft can move in the housing along the first direction and can rotate around the vertical axis; one end of the hand push rod is axially hinged to the connecting shaft around the connecting shaft; the trigger assembly includes a connecting rod, a transmission block, and two transmission shafts; the two transmission shafts are respectively coaxial with the rotation axes of the two walking wheels, and each transmission shaft is slidably installed in a rotation axis correspondingly; one ends of the two transmission shafts are opposite, and an installation groove adapted to the transmission block is provided at the opposite ends; the transmission block is connected to the connecting shaft through the connecting rod and is installed in the installation groove between the two transmission shafts; the width of the transmission block in the axial direction of the transmission shaft is smaller than the length in the first direction; and the width of the middle part of the transmission block in the first direction is larger than the widths of both ends; when the transmission block moves or rotates relative to the transmission shaft along the first direction, it pushes the two transmission shafts away from each other, and the two transmission shafts pushing away from each other respectively push the ejector pins in their corresponding walking wheels to move outwards.

[0006] Optionally, a slider is installed at each end of the connecting shaft, and the two sliders are both slidably installed in the housing along the first direction, and a first elastic member in the first direction is provided between the sliders and the housing; a vertically arranged hinge shaft is rotatably installed in the slider, the end of the connecting shaft passes through the slider, and a long hole vertically penetrating in the axial direction of the connecting shaft is provided at the end of the connecting shaft, the hinge shaft passes through the long hole, and the length of the long hole in the axial direction of the connecting shaft is greater than the diameter of the hinge shaft.

[0007] Optionally, there are four first elastic members, and they are grouped in pairs. The two first elastic members in the same group are respectively located on both sides of a slider in the first direction and are respectively connected to the housing and the slider.

[0008] Optionally, a receiving groove for receiving the end of the transmission shaft is provided in the walking wheel. The opposite ends of the two transmission shafts are respectively located in the receiving grooves in the corresponding walking wheels. The outer peripheral surface of the end of the transmission shaft is an arc surface and abuts against one end of the ejector pin close to the center of the walking wheel; the ejector pin is connected to the walking wheel through a second elastic member, and the second elastic member urges the ejector pin to retract into the walking wheel.

[0009] Optionally, the driving member is a motor, the output shaft of the motor is parallel to the rotation axis of the walking wheel, and drives the rotation axis of the walking wheel to rotate through a set of gears.

[0010] Optionally, the horizontal cross-section of the transmission block is a rhombus, the long side of the rhombus is along the first direction, and the short side of the rhombus is along the axial direction of the transmission shaft.

[0011] Optionally, multiple ejector pins are all located in the middle of the walking wheel in the axial direction.

[0012] Optionally, a material bin is installed on the housing, the material bin is used for storing paint, and the material bin is communicated with the nozzle.

[0013] Optionally, the rotation axis of the transmission wheel is rotatably connected to the housing through a bearing.

[0014] The beneficial effects of the present invention are as follows: The two traveling wheels of the building site planning marking device of the present invention are respectively driven to rotate by different driving members, which can not only make the outer shell move in a straight line but also move along an arc trajectory. Compared with manually pushing its movement, the movement is more stable and the marking accuracy is higher. The operator only needs to push the hand push rod to assist in moving forward, and the operation is simple.

[0015] When the operator accidentally touches or operates improperly, and the speed of pushing the hand push rod is too fast or too slow, the triggering component makes the ejector pin move out to be flush with the outer peripheral surface of the traveling wheel, increasing the moving resistance of the traveling wheel, avoiding excessive deviation of the outer shell under the operator's misoperation, and enabling the operator to receive feedback when feeling the change in the moving resistance of the traveling wheel, and timely adjust the speed of pushing the hand push rod, thereby reducing the impact on the movement of the outer shell and improving the marking accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a building site planning marking device of the present invention; Figure 2 It is a side view of the overall structure of an embodiment of a building site planning marking device of the present invention; Figure 3 It is Figure 2 a sectional view taken along the line A-A in Figure 4 It is Figure 3 an enlarged view at E in Figure 5 It is Figure 2 a sectional view taken along the line B-B in Figure 6 It is Figure 2 a sectional view taken along the line C-C in Figure 7 It is Figure 6 an enlarged view at F in Figure 8 It is a front view of the overall structure of an embodiment of a building site planning marking device of the present invention; Figure 9 It is Figure 8 a sectional view taken along the line D-D in

[0018] In the figure: 100, hand push rod; 200, housing; 210, driving member; 220, connecting shaft; 221, slider; 222, first elastic member; 223, hinge shaft; 230, nozzle; 240, storage bin; 300, traveling wheel; 310, rotating shaft; 320, ejector pin; 321, second elastic member; 400, trigger assembly; 410, connecting rod; 420, transmission block; 430, transmission shaft. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] An embodiment of a building site planning marking device of the present invention is as Figures 1 to 9 shown, including a hand push rod 100, a housing 200, and traveling wheels 300.

[0021] There are two traveling wheels 300, which are coaxial and spaced apart. The housing 200 is located between the two traveling wheels 300. The rotating shafts 310 of the two traveling wheels 300 are both horizontally and rotatably installed on the housing 200, and are respectively driven to rotate by two driving members 210 installed in the housing 200; specifically, the rotating shaft 310 of the traveling wheel 300 is rotatably connected to the housing 200 through a bearing. The driving member 210 is a motor, and the output shaft of the motor is parallel to the rotating shaft 310 of the traveling wheel 300, and drives the rotating shaft 310 of the traveling wheel 300 to rotate through a set of gears. When the rotational speeds of the two motors are the same, the two traveling wheels 300 rotate at the same speed and drive the housing 200 to move linearly; when the rotational speeds of the two motors are different, the two traveling wheels 300 drive the housing 200 to move along an arc trajectory. By adjusting the differential speed of the two motors, the radius of the arc trajectory along which the two traveling wheels 300 move can be controlled. Among them, in order to facilitate controlling the traveling trajectory of the traveling wheel 300, both driving members 210 are selected as motors that can be remotely controlled or controlled by a program.

[0022] A nozzle 230 is installed at the bottom of the housing 200, and the nozzle 230 is located at the symmetric center of the two traveling wheels 300, and sprays or drips paint onto the ground when moving with the traveling wheels 300. Specifically, when drawing a line of an arc trajectory, the rotational speed of the traveling wheel 300 close to the center of the arc trajectory is set to n 1 , and the distance from the center is r 1 ; the rotational speed of the traveling wheel 300 far from the center of the arc trajectory is n 3 , and the distance from the center is r 3; The distance between the two walking wheels 300 is a, the walking time is t, and the distance between the nozzle 230 and the center of the circle is r 2 . Given n 3 *t = 2πr 3 , n 1 *t = 2πr 1 , r 3 = r 1 + a, and by combining the equations, we can get n 3 t / n 1 t = 2πr 3 / 2πr 1 , and after sorting, we can get n 3 / n 1 = (r 1 + a) / r 1 = 1 + a / r 1 , and after further sorting, we can get r 1 = a / (n 3 / n 1 - 1), r 2 = r 1 + a / 2 = a / (n 3 / n 1 - 1)+ a / 2.

[0023] In summary, by adjusting the speed ratio of the two walking wheels 300, arc trajectories with different radii can be drawn.

[0024] One end of the hand push rod 100 is rotatably installed on the housing 200 and is used to push the housing 200 to move; a plurality of ejector pins 320 are arranged circumferentially inside the walking wheel 300, and the ejector pins 320 extend radially along the walking wheel 300 and can move radially along it; a trigger assembly 400 is arranged between the hand push rod 100 and the walking wheel 300. When the moving speed of the operator pushing the hand push rod 100 does not match the moving speed of the walking wheel 300, the trigger assembly 400 makes the ejector pins 320 move to be flush with the outer peripheral surface of the walking wheel 300, increasing the moving resistance of the walking wheel 300 while reminding the operator to control the moving speed of pushing the hand push rod 100.

[0025] Since there are only two walking wheels 300, during use, an operator needs to hold the hand push rod 100 to assist the housing 200 to move forward. Since the walking wheels 300 are driven by the driving member 210 to rotate and then drive the housing 200 to move forward, the speed of manually pushing the housing 200 needs to be adapted to the speed at which the walking wheels 300 drive the housing 200 to move forward as much as possible. However, when the operator accidentally touches or operates improperly, and the speed of pushing the hand push rod 100 is too fast or too slow, the triggering assembly 400 causes the ejector pin 320 to move out and be flush with the outer peripheral surface of the walking wheel 300, increasing the moving resistance of the walking wheel 300, preventing the housing 200 from deviating too much under the operator's misoperation, and enabling the operator to receive feedback when feeling the change in the moving resistance of the walking wheel 300, timely adjusting the speed of pushing the hand push rod 100, thereby reducing the impact on the movement of the housing 200 and improving the accuracy of scribing.

[0026] In this embodiment, the horizontal direction perpendicular to the rotation axis 310 of the traveling wheels 300 is the first direction, which is the direction of movement of the housing 200; a connecting shaft 220 is installed in the housing 200, and the connecting shaft 220 can move in the housing 200 along the first direction and can rotate about the vertical axis; one end of the hand push rod 100 is axially hinged to the middle of the connecting shaft 220 around the connecting shaft 220. The trigger assembly 400 includes a connecting rod 410, a transmission block 420, and two transmission shafts 430; the two transmission shafts 430 are respectively coaxial with the rotation axes 310 of the two traveling wheels 300, and each transmission shaft 430 is slidably installed in a rotation axis 310 correspondingly; the two transmission shafts 430 are arranged in sequence along the axial direction of the rotation axis 310, and one ends are opposite to each other, and installation grooves adapted to the transmission block 420 are provided at the opposite ends of the two transmission shafts 430. The transmission block 420 is connected to the connecting shaft 220 through the connecting rod 410 and is installed in the installation grooves between the two transmission shafts 430; the width of the transmission block 420 in the axial direction of the transmission shaft 430 is smaller than the length in the first direction; and the width of the middle part of the transmission block 420 in the first direction is larger than the widths of the two ends; when the transmission block 420 moves or rotates relative to the transmission shaft 430 along the first direction, it pushes the two transmission shafts 430 away from each other, and the two transmission shafts 430 pushing away from each other respectively push the ejector pins 320 in the corresponding traveling wheels 300 to move outwards. In the initial state, the side wall of the transmission block 420 is in contact with the side wall of the installation groove. When the operator pushes the hand push rod 100 to generate an instantaneous forward movement (the front side in the traveling direction of the housing 200, that is, the front side in the first direction), the connecting shaft 220 drives the transmission block 420 to move forward relative to the transmission shaft 430 through the connecting rod 410. Since the width of the middle part of the transmission block 420 in the first direction is larger than the widths of the two ends, the transmission block 420 will push the two transmission shafts 430 away from each other when moving forward relative to the transmission shaft 430, thereby pushing the ejector pins 320 to extend. When the two traveling wheels 300 rotate differentially to drive the housing 200 to move along an arc track, if the operator pushes the hand push rod 100 to generate a rotation greater than the current rotation amplitude of the housing 200, the connecting shaft 220 drives the transmission block 420 to rotate relative to the transmission shaft 430 through the connecting rod 410. Since the width of the transmission block 420 in the axial direction of the transmission shaft 430 is smaller than the length in the first direction, when the transmission block 420 rotates relative to the transmission shaft 430, it will also push the two transmission shafts 430 away from each other, thereby pushing the ejector pins 320 to extend.

[0027] In this embodiment, a slider 221 is installed at each end of the connecting shaft 220. The two sliders 221 are both slidably installed on the housing 200 in the first direction, and a first elastic member 222 in the first direction is provided between the sliders 221 and the housing 200. A vertically arranged hinge shaft 223 is rotatably installed in the slider 221. The end of the connecting shaft 220 passes through the slider 221, and a long hole penetrating in the vertical direction is formed at the end of the connecting shaft 220. The hinge shaft 223 passes through the long hole, and the length of the long hole in the axial direction of the connecting shaft 220 is greater than the diameter of the hinge shaft 223. Wherein, the slider 221 is provided with a through hole for the connecting shaft 220 to pass through, and the length of the through hole in the first direction is greater than the diameter of the connecting shaft 220. The through hole and the long hole provide a clearance space for the two ends of the connecting shaft 220 to rotate around the hinge shaft 223.

[0028] In this embodiment, there are four first elastic members 222, and they are grouped in pairs. The two first elastic members 222 in the same group are respectively located on both sides of a slider 221 in the first direction, and are respectively connected to the housing 200 and the slider 221. Wherein, the first elastic member 222 is a spring. In the initial state, the four first elastic members 222 act together to keep the connecting shaft 220 holding the transmission block 420 in a state of being in contact with the installation groove through the connecting rod 410.

[0029] In this embodiment, a receiving groove for receiving the end of the transmission shaft 430 is formed in the traveling wheel 300. The mutually remote ends of the two transmission shafts 430 are respectively located in the receiving grooves in the corresponding traveling wheels 300. A plurality of ejector pins 320 are all located in the middle of the traveling wheel 300 in the axial direction, and the end close to the center of the traveling wheel 300 extends into the receiving groove. The outer peripheral surface of the end of the transmission shaft 430 is an arc surface and abuts against the end of the ejector pin 320 close to the center of the traveling wheel 300. The ejector pin 320 is connected to the traveling wheel 300 through a second elastic member 321, and the second elastic member 321 urges the ejector pin 320 to retract into the traveling wheel 300. Wherein, the second elastic member 321 is a spring or an elastic strip connecting the ejector pin 320 and the traveling wheel 300.

[0030] In this embodiment, the horizontal cross-section of the transmission block 420 is a rhombus, and the long side of the rhombus is along the first direction, and the short side of the rhombus is along the axial direction of the transmission shaft 430. In some other embodiments, the horizontal cross-section of the transmission block 420 can also be a spindle shape that is wide in the middle and narrow at both ends.

[0031] In this embodiment, a material bin 240 is installed on the housing 200. The material bin 240 is used for storing paint, and the material bin 240 is communicated with the nozzle 230. In some other embodiments, the material bin 240 and the nozzle 230 can also be communicated through a hose. During use, the hand-held material bin 240 moves along with the housing 200 to reduce the load of the housing 200.

[0032] When a building site planning marking device of the present invention is in use, an operator holds the hand push rod 100 to assist the housing 200 to move forward. Since the traveling wheels 300 are driven by the driving member 210 to rotate and then drive the housing 200 to move forward, the speed of manually pushing the housing 200 needs to be adapted to the speed at which the traveling wheels 300 drive the housing 200 to move forward as much as possible. In the initial state, under the action of the first elastic member 222, the connecting shaft 220 makes the transmission block 420 fit with the installation grooves opened at the opposite ends of the two transmission shafts 430 through the connecting rod 410. When the traveling wheels 300 rotate at the same speed and drive the housing 200 to move forward in the first direction, the operator uses the hand push rod 100 to assist the housing 200 to move in the first direction. When the operator pushes the hand push rod 100 instantaneously forward (the front side in the traveling direction of the housing 200, that is, the front side in the first direction), the connecting shaft 220 drives the transmission block 420 to move forward relative to the transmission shaft 430 through the connecting rod 410. Since the width of the middle part of the transmission block 420 in the first direction is greater than the widths of both ends, when the transmission block 420 moves forward relative to the transmission shaft 430, it will push the two transmission shafts 430 away from each other, and then push the ejector pin 320 to extend. When the two traveling wheels 300 rotate differentially and drive the housing 200 to move along an arc trajectory, if the operator pushes the hand push rod 100 to generate a rotation greater than the current rotation amplitude of the housing 200, the connecting shaft 220 drives the transmission block 420 to rotate relative to the transmission shaft 430 through the connecting rod 410. Since the width of the transmission block 420 in the axial direction of the transmission shaft 430 is less than the length in the first direction, when the transmission block 420 rotates relative to the transmission shaft 430, it will also push the two transmission shafts 430 away from each other, and then push the ejector pin 320 to extend. The ejector pin 320 moves out and is flush with the outer peripheral surface of the traveling wheel 300, increasing the moving resistance of the traveling wheel 300, preventing the housing 200 from deviating too much under the misoperation of the operator, and enabling the operator to receive feedback when feeling the change in the moving resistance of the traveling wheel 300, and timely adjust the speed or angle of pushing the hand push rod 100, thereby reducing the influence on the movement of the housing 200 and improving the accuracy of scribing.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction site planning marking device, characterized in that: It includes a push rod, a housing and a travel wheel; There are two running wheels, which are coaxial and spaced apart. The housing is located between the two running wheels. The rotating shafts of the two running wheels are horizontally and rotatably mounted on the housing, and are driven to rotate by two driving members installed in the housing respectively. A nozzle is installed at the bottom of the housing. One end of the push rod is rotatably installed on the outer shell, and is used to push the outer shell to move; a plurality of ejectors are arranged around the circumference of the walking wheel, and the ejectors extend radially along the walking wheel and can move radially along the walking wheel; a trigger assembly is arranged between the push rod and the walking wheel, and when the moving speed of the push rod pushed by the operator does not match the moving speed of the walking wheel, the trigger assembly causes the ejector to move to be flush with the outer circumferential surface of the walking wheel, thereby increasing the moving resistance of the walking wheel and reminding the operator to control the moving speed of the push rod.

2. A construction site planning marking device according to claim 1, characterized in that: The horizontal direction perpendicular to the rotating shaft of the walking wheel is the first direction; a connecting shaft is installed in the shell, and the connecting shaft can move in the shell along the first direction and can rotate around the vertical axis; one end of the hand push rod is axially hinged to the connecting shaft around the connecting shaft; the trigger assembly includes a connecting rod, a transmission block and two transmission shafts; the two transmission shafts are coaxial with the rotating shafts of the two walking wheels respectively, and each transmission shaft is correspondingly slidably installed in a rotating shaft; one end of the two transmission shafts is opposite to each other, and the opposite end is provided with a mounting groove adapted to the transmission block; the transmission block is connected to the connecting shaft through the connecting rod and is installed in the mounting groove between the two transmission shafts; the width of the transmission block in the axial direction of the transmission shaft is smaller than the length in the first direction; and the width of the middle part of the transmission block in the first direction is larger than the width at both ends; when the transmission block moves or rotates relative to the transmission shaft along the first direction, it pushes the two transmission shafts away from each other, and the two transmission shafts move away from each other and push the ejectors in their corresponding walking wheels to move out.

3. A construction site planning marking device according to claim 2, characterized in that: A slider is installed at each end of the connecting shaft, and both sliders are slidably installed on the outer shell along a first direction, and a first elastic member along the first direction is arranged between the slider and the outer shell; a vertically arranged hinge shaft is rotatably installed in the slider, and the end of the connecting shaft passes through the slider, and a long hole is opened at the end of the connecting shaft and passes through the long hole, and the length of the long hole in the axial direction of the connecting shaft is greater than the diameter of the hinge shaft.

4. A construction site planning marking device according to claim 3, characterized in that: There are four first elastic members, which are arranged in groups of two. The two first elastic members in the same group are respectively located on both sides of a slider in the first direction, and are respectively connected to the housing and the slider.

5. A construction site planning marking device according to claim 2, characterized in that: A receiving groove for receiving the end of the transmission shaft is provided in the traveling wheel, and the ends of the two transmission shafts that are away from each other are respectively located in the corresponding receiving grooves in the traveling wheel. The outer peripheral surface of the end of the transmission shaft is an arc surface and abuts against the end of the ejector close to the center of the traveling wheel; the ejector and the traveling wheel are connected by a second elastic member, and the second elastic member prompts the ejector to be retracted into the traveling wheel.

6. A construction site planning marking device according to claim 1, characterized in that: The driving member is a motor, the output shaft of the motor is parallel to the rotating shaft of the walking wheel, and drives the rotating shaft of the walking wheel to rotate through a group of gears.

7. A construction site planning marking device according to claim 2, characterized in that: The horizontal cross section of the transmission block is a rhombus, with the long side of the rhombus along the first direction and the short side of the rhombus along the axial direction of the transmission shaft.

8. A construction site planning marking device according to claim 1, characterized in that: The plurality of ejectors are all located in the middle of the traveling wheel in the axial direction.

9. A construction site planning marking device according to claim 1, characterized in that: A silo is installed on the shell, the silo is used to store paint, and the silo is connected with the nozzle.

10. A construction site planning marking device according to claim 1, characterized in that: The rotating shaft of the transmission wheel is rotatably connected to the housing via a bearing.

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