Land area measuring device

Abstract

The utility model belongs to the technical field of land area measurement, and particularly relates to a land area measuring device. Comprising a roller, a roller frame is mounted on the roller, a push rod for pushing the roller to move is connected to the roller frame, a plurality of first magnets distributed along the circumference of the roller at equal intervals are arranged on the roller, a mounting hole is formed in the roller frame, and a pressure sensor is mounted in the mounting hole. A second magnet independent of the pressure sensor is arranged in the mounting hole corresponding to the working end of the pressure sensor, and all the first magnets and the second magnet repel each other. According to the utility model, the plurality of first magnets are arranged on the circumference of the roller, the second magnets and the pressure sensors are arranged on the roller frame, every time when one first magnet passes through the second magnets, the second magnets are repelled and collide with the pressure sensors once, and the moving distance between two points is judged according to the number of the collided pressure sensors; therefore, the accuracy in the area measurement process is improved to a certain extent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to land area measurement technical field, especially a land area measurement device. BACKGROUND

[0002] In the land acquisition process, accurate measurement of land area is a vital work, which is directly related to the fairness and rationality of land compensation. The traditional land area measurement method mainly adopts the roller type range finder, and this instrument can meet the basic measurement demand to a certain extent due to its simple operation and relatively low cost.

[0003] However, with the continuous improvement of measurement accuracy requirement, the limitations of the roller type range finder are increasingly prominent. The measurement principle of the wheel type range finder on the market mainly depends on the number of rotations of the roller to determine the distance between two points, and the circumference of one rotation of the roller represents the length of the straight line distance. However, in the actual land area measurement process, due to the unevenness of the land surface, obstacles and the operation habits of the measurement personnel, the roller often cannot rotate a complete number of times each time. For the part of the roller that rotates more than one rotation, the instrument often cannot accurately calculate, and after accumulation, it will significantly affect the final measurement result, resulting in the decrease of the accuracy of land area measurement. SUMMARY

[0004] The utility model aims at providing a land area measurement device, which can improve the accuracy of area measurement to a certain extent.

[0005] The land area measurement device comprises a roller, a wheel frame is installed on the roller, a push rod for pushing the roller to move is connected to the wheel frame, a plurality of first magnets are arranged on the roller at equal intervals along the circumference of the roller, a mounting hole is formed in the wheel frame, a pressure sensor is installed in the mounting hole, a second magnet independent of the pressure sensor is arranged in the mounting hole corresponding to the working end of the pressure sensor, and all the first magnets repel the second magnet.

[0006] Further, all the first magnets are installed on the outer surface of the roller, and the outer surface of the roller is provided with a groove for embedding the first magnet.

[0007] Further, a wheel sleeve is sleeved on the roller, the first magnet is located inside the wheel sleeve, and the wheel sleeve is made of rubber material.

[0008] Further, the wheel frame has a "door" type structure, a center shaft is independently arranged in the center hole of the roller, and the two ends of the center shaft are connected to the two support ends of the wheel frame.

[0009] Further, the mounting hole is arranged on the top of the wheel frame, the connecting end of the push rod is connected with the mounting hole through screw connection, the pressure sensor is fixed on the lower end of the push rod, the second magnet is arranged on the bottom of the mounting hole, a spring for pushing the second magnet away from the working end of the pressure sensor is arranged between the second magnet and the pressure sensor, and the elastic force of the spring is smaller than the repulsion force between the first magnet and the second magnet.

[0010] Further, the outer side wall of the push rod is fixed with a display for displaying distance, a single-chip microcomputer for receiving the signal of the pressure sensor and converting the distance information to be displayed on the display screen is arranged in the display, and the single-chip microcomputer is electrically connected with the pressure sensor.

[0011] Further, one side of the wheel frame is fixed with a shovel plate.

[0012] Compared with the prior art, the area measuring device has the following beneficial effects:

[0013] The first magnet is arranged on the circumference of the roller, the second magnet and the pressure sensor are arranged on the wheel frame, the second magnet is repulsively impacted on the pressure sensor once when each first magnet passes the second magnet, the moving distance between two points is determined by the number of impacts on the pressure sensor, and the accuracy in the area measuring process is improved to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural schematic view of the utility model; Figure 1 It is a sectional view of A-A in the utility model;

[0016] Figure 3 It is a three-dimensional structural view of the utility model;

[0017] Figure 4 It is a sectional view of B in the utility model; Figure 2

[0018] Names of components in the drawing: 1, roller; 2, central shaft; 3, first magnet; 4, spring; 5, pressure sensor; 6, display; 7, handle; 8, push rod; 9, wheel frame; 10, second magnet; 11, end cover; 12, wheel sleeve. DETAILED DESCRIPTION

[0019] The utility model is further described in connection with the drawings through specific embodiments, but is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0020] EMBODIMENT ​

[0021] The land area measuring device comprises a roller 1, a wheel frame 9 installed on the roller 1, a center shaft 2 independently penetrating the center hole of the roller 1, and two end covers 11 connected to the two ends of the center shaft 2. Figure 2 The wheel frame 9 is in a "door" type structure, the center hole of the roller 1 is independently penetrated by the center shaft 2, and the two ends of the center shaft 2 are respectively connected to the two support ends of the wheel frame 9. The roller 1 is located on the inner side of the wheel frame 9, the support ends of the wheel frame 9 are provided with left and right connecting holes, the left and right ends of the center shaft 2 are respectively penetrated through the connecting holes and connected with the end covers 11, and the end covers 11 prevent the center shaft 2 from falling off. The end covers 11 are connected with the center shaft 2 through threads, the two ends of the center shaft 2 are provided with first external threads, and the inner side of the end cover 11 is provided with first internal threads matched with the first external threads. In use, the roller 1 can freely roll in the wheel frame 9.

[0022] A plurality of first magnets 3 are arranged on the roller 1 at equal intervals along the circumference of the roller 1, the first magnets 3 are all installed on the outer surface of the roller 1, and the outer surface of the roller 1 is provided with grooves for embedding the first magnets 3. The first magnets 3 are fixed on the roller 1 through the grooves. The interval between every two adjacent first magnets 3 is the same, and the representative straight line distance is communicated. A wheel sleeve 12 is sleeved on the roller 1, the first magnets 3 are located on the inner side of the wheel sleeve 12, and the wheel sleeve 12 is made of rubber.

[0023] A push rod 8 for pushing the roller 1 to move is connected to the wheel frame 9, a handle 7 is fixed to the pushing end of the push rod 8, and in use, the staff holds the handle 7 to push the roller 1 to work.

[0024] As shown in Figure 2 and Figure 4 , an installation hole is formed in the wheel frame 9, a pressure sensor 5 is installed in the installation hole, a second magnet 10 corresponding to the working end of the pressure sensor 5 is arranged in the installation hole, all the first magnets 3 repel the second magnet 10, the installation hole is formed in the top of the wheel frame 9, the connecting end of the push rod 8 is connected to the installation hole through threads, the pressure sensor 5 is fixed to the lower end of the push rod 8, the second magnet 10 is located at the bottom of the installation hole, a spring 4 is installed between the second magnet 10 and the pressure sensor 5 to push the second magnet 10 away from the working end of the pressure sensor 5, and the elastic force of the spring 4 is smaller than the repulsive force of the first magnet 3 and the second magnet 10.

[0025] A second external thread is formed on the outer side wall of the lower end of the push rod 8, a second internal thread matched with the second external thread is formed in the installation hole, and in installation, the push rod 8 is rotated into the installation hole to be connected with the wheel frame 9. An inlay groove is formed in the lower end of the push rod 8, the pressure sensor 5 is installed in the inlay groove and also in the installation hole.

[0026] In use, the roller 1 rotates, and when the first magnet 3 and the second magnet 10 pass each other, repulsion is generated between the two, and the second magnet 10 breaks through the elastic force of the spring 4 and moves to the working end of the pressure sensor 5 and collides with it.

[0027] The bottom of the mounting hole is provided with a through hole communicating between the inside and the outside, and the diameter of the through hole is smaller than the diameter of the second magnet 10, so as to prevent the second magnet 10 from being separated from the mounting hole, and the through hole reduces the obstacles between the first magnet 3 and the second magnet 10 and increases the repulsion. Of course, if the repulsion is sufficient, the through hole is not recommended to be provided, which is easy to make dust enter the mounting hole and affect the pressure sensor 5.

[0028] As shown in Figure 3 The outer side wall of the push rod 8 is fixed with a display 6 for displaying the distance, and the display 6 is provided with a single-chip microcomputer for receiving the signal of the pressure sensor 5 and converting the distance information to be displayed on the display screen, and the single-chip microcomputer is electrically connected with the pressure sensor 5. The push rod 8 is hollow, which is used to hide the wires connected between the pressure sensor 5, the single-chip microcomputer and the display 6. The single-chip microcomputer and the pressure sensor 5 are connected through wires, and of course the battery required by the electronic components such as the display 6 and the pressure sensor 5 can also be installed in the shell of the display 6.

[0029] In use, the roller 1 rotates, and when the first magnet 3 and the second magnet 10 pass each other, repulsion is generated between the two, and the second magnet 10 breaks through the elastic force of the spring 4 and moves to the working end of the pressure sensor 5 and collides with it. The signal received by the pressure sensor 5 is transmitted to the single-chip microcomputer, and after information processing, the single-chip microcomputer converts the signal of each collision into distance information and displays it on the display screen of the display 6.

[0030] The single-chip microcomputer is a product, and its model is STM32. The STM32 series single-chip microcomputer has rich peripherals and powerful processing capability, and can easily process the encoder signal, the pressure sensor 5 and perform distance calculation. For example, the STM32 single-chip microcomputer can receive the pressure sensor 5 and calculate the moving distance combined with the circumference between the two first magnets 3.

[0031] One side of the wheel frame 9 is fixed with a shovel plate, and in use, the soil brought by the rotation of the roller 1 is removed by the shovel plate. Avoiding the influence of the residual soil on the roller 1 on the repulsion magnetic field between the second magnet 10 and the first magnet 3.

[0032] In actual use, the staff pushes the roller 1 forward, the first magnet 3 repeatedly passes under the second magnet 10, the repulsion between the two makes the second magnet 10 collide with the working end of the pressure sensor 5, and the single-chip microcomputer feeds back the distance information according to the number of collisions accepted by the pressure sensor 5, thereby avoiding the measurement deviation caused by the multiple rotation of the roller 1 without a week, and the distance measurement deviation of the embodiment is controlled within the circumference between the two first magnets 3, which improves the accuracy of area measurement to a certain extent.

[0033] To measure the area of the land, the length distance and the width distance need to be measured and calculated. The product also has the advantages of simple structure and easy maintenance. Users only need to check the status of the first magnet 3, the second magnet 10 and the pressure sensor 5 regularly to ensure that they can work normally.

Claims

1. A land area measuring device comprising a roller (1), a wheel frame (9) is installed on the roller (1), a push rod (8) for pushing the roller (1) to move is connected to the wheel frame (9), characterized in that: The rolling wheel (1) is provided with a plurality of first magnets (3) distributed equidistantly along the circumference of the rolling wheel (1), the wheel frame (9) is provided with a mounting hole, a pressure sensor (5) is mounted in the mounting hole, a second magnet (10) is arranged in the mounting hole corresponding to the working end of the pressure sensor (5), and all the first magnets (3) repel the second magnet (10).

2. The land area measuring apparatus according to claim 1, characterized by: All the first magnets (3) are mounted on the outer surface of the rolling wheel (1), and the outer surface of the rolling wheel (1) is provided with a groove for embedding the first magnets (3).

3. The land area measuring apparatus according to claim 2, characterized by: The rolling wheel (1) is sleeved with a wheel sleeve (12), the first magnets (3) are located inside the wheel sleeve (12), and the wheel sleeve (12) is made of rubber.

4. The land area measuring apparatus according to claim 1, characterized by: The wheel frame (9) is in a "door" type structure, the central hole of the rolling wheel (1) is independently provided with a central shaft (2), and the two ends of the central shaft (2) are connected to the two support ends of the wheel frame (9).

5. The land area measuring apparatus according to claim 4, characterized by: The mounting hole is arranged at the top of the wheel frame (9), the connecting end of the push rod (8) is connected to the mounting hole through threads, the pressure sensor (5) is fixed to the lower end of the push rod (8), the second magnet (10) is located at the bottom of the mounting hole, a spring (4) is arranged between the second magnet (10) and the pressure sensor (5) to push the second magnet (10) away from the working end of the pressure sensor (5), and the elastic force of the spring (4) is smaller than the repulsive force between the first magnet (3) and the second magnet (10).

6. The land area measuring apparatus according to claim 5, characterized by: The outer side wall of the push rod (8) is fixed with a display (6) for displaying the distance, a single-chip microcomputer is arranged in the display (6) to receive the signal of the pressure sensor (5) and convert the distance information into a display on the display screen, and the single-chip microcomputer is electrically connected to the pressure sensor (5).

7. The land area measuring apparatus according to claim 1, characterized by: One side of the wheel frame (9) is fixed with a shovel plate.

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