Device for measuring diameter at breast height of forestry tree

Abstract

The utility model relates to the technical field of tree breast diameter measurement, and discloses a forestry tree breast diameter measuring device which comprises a sliding rod, the front end of the sliding rod is respectively provided with a supporting rod extending towards two sides of the front, the front ends of the two supporting rods are respectively connected with a sliding seat in a rotating mode, the two sliding seats are respectively arranged on a sliding rail in a sliding mode, and the two sliding rails are respectively provided with a sliding rod. The two sliding rails are fixedly connected to the outer side of a chain rod, the ends of the two chain rods are rotationally connected, the two chain rods are each provided with a sliding groove, a sliding block is arranged in each sliding groove in a sliding mode, a measuring rod is arranged on each sliding block, and the two chain rods are attached to the surface of a tree trunk, so that the measuring accuracy of the tree trunk is improved. By measuring the distance between each measuring rod and the chain rod on the opposite side, the diameter at breast height of a tree trunk can be obtained, measurement can be carried out twice in the mutually perpendicular directions when the tree trunk is clamped once, the diameter at breast height of the tree trunk can be measured more accurately according to the average value obtained through measurement twice, and the measurement error is reduced.

Description

Technical Field

[0001] This utility model relates to the field of tree diameter at breast height (DBH) measurement technology, specifically a device for measuring the DBH of forestry trees. Background Technology

[0002] Forestry land is land specifically designated for forestry production. This includes forested land, shrubland, sparse forest land, as well as suitable afforestation land and non-forested land that is not yet forested. To understand the local ecological conditions of forestry land, regular surveys of forest land are necessary. In forest resource surveys, diameter at breast height (DBH) is an important stand survey factor. It is also one of the most fundamental factors reflecting the quality and growth of standing trees. Rapid and accurate measurement of DBH is of great significance for forest resource surveys and rational management.

[0003] According to Chinese Patent Publication No. CN221840315U, "A Tree Diameter-at-Breast-Length (DBH) Measuring Device for Forestry Surveys," this invention relates to the field of tree DBH measurement technology. It includes a hollow L-shaped rod, with an operating rod fixedly connected to the middle of its front end. A measuring component is located on the right rear end of the hollow L-shaped rod, and a positioning component is located on the left front end. The measuring component includes a pointer, and a threaded rod is rotatably connected to the left and right sides of the inner surface of the horizontal portion of the hollow L-shaped rod. This forestry tree DBH measuring device, through its measuring and positioning components, allows for precise measurement of the tree's DBH when the hollow L-shaped rod is in close contact with the tree. It requires no fixing, is simple and convenient to use, and thus improves measurement efficiency. The positioning component accurately locates the DBH position for forestry surveyors, resulting in more accurate measurement data and facilitating use by forestry surveyors.

[0004] The device uses a lead screw to drive the clamping rod to move and hold the tree trunk to measure its diameter at breast height (DBH). However, the cross-section of the tree trunk is often not a regular circle, and the device can only perform a single measurement after holding the trunk, which often results in a large error in the measurement results. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a forestry tree diameter-at-breast-width (DBH) measuring device that can perform two measurements in mutually perpendicular directions when clamping a tree trunk once. Based on the average value of the two measurements, the DBH of the tree trunk can be measured more accurately, reducing measurement errors.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A device for measuring the diameter at breast height (DBH) of forest trees includes a sliding rod. A support rod extends forward from the front end of each sliding rod to both sides. A sliding block is rotatably connected to the front end of each support rod. The two sliding blocks are slidably mounted on a slide rail. The two slide rails are fixedly connected to the outer side of a chain rod. The ends of the two chain rods are rotatably connected. A stop block is provided on the inner side of each support rod, and the height of the stop block ensures that the two chain rods are perpendicular to each other when the outer side of the chain rod contacts the stop block. Each chain rod has a groove, and a slider is slidably mounted inside each groove. Each slider has a measuring rod mounted on it, and the measuring rod is perpendicular to the chain rod to which it is located.

[0008] Preferably, the surface of the chain rod is provided with a scale.

[0009] Preferably, a thrust spring is provided between the slider and one end of the inner side of the groove.

[0010] Preferably, it also includes a pull rope, with a first pull rope ring provided on one end of the inner side of the chain rod, and a second pull rope ring provided on the slide rod. The middle position of the pull rope passes through the second pull rope ring, and the two ends of the pull rope pass through the first pull rope rings on both sides and are then fixedly connected to the slider on that side.

[0011] Preferably, the middle position of the pull rope passes through the second pull rope loop and is sleeved on the pulley, the pulley is fixedly mounted on the sliding sleeve, and the sliding sleeve is mounted on the sliding rod.

[0012] Preferably, the slide bar is provided with a handle on its side.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0014] By pushing the device forward, the two chain rods rotate under the push of the tree trunk until the outer side of the chain rods contacts the stop block. At this point, the two chain rods are in contact with the surface of the tree trunk and are perpendicular to each other. Pulling the measuring rods vertically set on the chain rods until they are in contact with the surface of the tree trunk, each measuring rod is parallel to the chain rod on the opposite side. By measuring the distance between each measuring rod and the chain rod on the opposite side, a value of the diameter at breast height (DBH) of the tree trunk can be obtained. The two DBH values ​​are measured in a direction with a 90° interval. This achieves two measurements in mutually perpendicular directions when clamping the tree trunk once. Based on the average value of the two measurements, the DBH of the tree trunk can be measured more accurately, reducing measurement errors. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention after clamping the tree trunk.

[0017] Figure 3 This is a schematic diagram of the structure of the present invention after the pull rope is installed;

[0018] Figure 4 This is a schematic diagram of the structure of the present invention after the pull rope is pulled;

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the chain rod of this utility model.

[0020] The components are: 1. slide rod; 2. support rod; 3. slide block; 4. slide rail; 5. chain rod; 6. stop block; 7. slide groove; 8. slider; 9. measuring rod; 10. scale; 11. thrust spring; 12. pull rope; 13. first pull rope ring; 14. second pull rope ring; 15. pulley; 16. sliding sleeve; 17. grip. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] This utility model provides the following technical solution:

[0023] Combination Figure 1 and Figure 2 As shown in the figure, this embodiment discloses a forest tree diameter at breast height (DBH) measuring device, including a sliding rod 1. The front ends of the sliding rod 1 are respectively provided with a support rod 2 extending forward to both sides. The front ends of the two support rods 2 are rotatably connected to a sliding seat 3. The two sliding seats 3 are respectively slidably mounted on a slide rail 4. The two slide rails 4 are respectively fixedly connected to the outside of a chain rod 5. The ends of the two chain rods 5 are rotatably connected. A stop block 6 is provided on the inner side of the support rod 2. The height of the stop block 6 is such that when the outside of the chain rod 5 contacts the stop block 6, the two chain rods 5 are perpendicular to each other. Each of the two chain rods 5 is provided with a groove 7. A slider 8 is slidably mounted inside each groove 7. A measuring rod 9 is provided on each slider 8. The measuring rod 9 is perpendicular to the chain rod 5 to which it is located.

[0024] By rotating the two chain rods 5 to a horizontal position, the slide block 3 on the outer side of the chain rod 5 slides backward on the slide rail 4. At the same time, the slide block 3 rotates at the end of the support rod 2, forming an opening on the front side of the chain rod 5. The tree trunk is placed in this opening, and the device is pushed forward. At this point, the tree trunk is located at the rotating connection point of the two chain rods 5. Driven by the tree trunk, the two chain rods 5 rotate, and the slide block 3 on the outer side of the chain rod 5 slides forward on the slide rail 4. At the same time, the slide block 3 rotates at the end of the support rod 2 until the outer side of the chain rod 5 contacts the stop block 6. At this point, the two chain rods 5 are in contact with the surface of the tree trunk. Simultaneously, the two chain rods 5 are perpendicular to each other, pulling the measuring rods 9 vertically set on the chain rods 5 until they are in contact with the trunk surface. At this time, each measuring rod 9 is parallel to the chain rod 5 on the opposite side. By measuring the distance between each measuring rod 9 and the chain rod 5 on the opposite side, a value of the trunk's diameter at breast height (DBH) can be obtained. The two DBH values ​​are measured in a direction with a 90° interval. This achieves the ability to perform two measurements in mutually perpendicular directions when clamping the trunk once. Based on the average value of the two measurements, the DBH of the trunk can be measured more accurately, reducing measurement errors.

[0025] Specifically, in combination Figure 1 As shown, a scale 10 is provided on the surface of the chain rod 5.

[0026] When the two link 5 are perpendicular to each other, the position of the surface of one link 5 corresponding to the inner side of the other link 5 is aligned with the zero mark of the scale 10. The diameter at breast height (DBH) of the tree is obtained by measuring the reading of the corresponding position of the measuring rod 9 and the scale 10.

[0027] Specifically, in combination Figure 5 As shown, a thrust spring 11 is provided between the slider 8 and one end of the inner side of the groove 7.

[0028] The thrust spring 11 applies an outward thrust to the slider 8, keeping the measuring rod 9 outside the chain rod 5, thus avoiding manual reset after measurement.

[0029] Specifically, in combination Figure 3 and Figure 4 As shown, it also includes a pull rope 12. A first pull rope ring 13 is provided on one end of the inner side of the chain rod 5, and a second pull rope ring 14 is provided on the slide rod 1. The middle position of the pull rope 12 passes through the second pull rope ring 14, and the two ends of the pull rope 12 pass through the first pull rope rings 13 on both sides and are then fixedly connected to the slider 8 on that side.

[0030] After the two chain rods 5 are perpendicular to each other and in contact with the tree trunk surface, by pulling the middle position of the pull rope 12, the pull rope 12, guided by the first pull rope ring 13 and the second pull rope ring 14, applies an inward sliding force to the slider 8, causing the measuring rod 9 to be in contact with the tree trunk surface. Pulling the middle position of the pull rope 12 can simultaneously make both measuring rods 9 in contact with the tree trunk, which is convenient to use.

[0031] Specifically, in combination Figure 3 and Figure 4 As shown, the middle position of the pull rope 12 passes through the second pull rope ring 14 and is sleeved on the pulley 15. The pulley 15 is fixedly mounted on the sliding sleeve 16, and the sliding sleeve 16 is slidably mounted on the slide rod 1.

[0032] The sliding sleeve 16 drives the pulley 15 to move, pulling the middle position of the pull rope 12. With the pulley 15 set, when the trunk cross section is irregular, the two measuring rods 9 move different distances. The middle position of the pull rope 12 slides on the surface of the pulley 15 to balance the pulling distance on both sides, ensuring that both measuring rods 9 are in contact with the trunk surface.

[0033] Specifically, in combination Figure 3 and Figure 4 As shown, a grip bar 17 is provided on the side of the slide bar 1.

[0034] The device is easy to use by holding the lever 17 with one hand and pulling the slide 16 with the other.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A forestry tree breast diameter measuring device comprising a slide bar (1) characterised in that: The front end of the slide rod (1) extends to the front of both sides and is provided with a support rod (2), the front end of the two support rods (2) is rotatably connected with a slide block (3), the two slide blocks (3) are slidably arranged on a slide rail (4), the two slide rails (4) are fixedly connected to the outer side of a chain rod (5), the end of the two chain rods (5) is rotatably connected, the inner side of the support rod (2) is provided with a stop block (6), and the height of the stop block (6) satisfies that when the outer side of the chain rod (5) is in contact with the stop block (6), the two chain rods (5) are perpendicular to each other, a sliding groove (7) is arranged on each of the two chain rods (5), a sliding block (8) is slidably arranged in each sliding groove (7), a measuring rod (9) is arranged on each sliding block (8), and the measuring rod (9) is perpendicular to the chain rod (5) where it is arranged.

2. A forestry tree breast diameter measuring device according to claim 1, characterised in that: The surface of the chain rod (5) is provided with a scale (10).

3. A forestry tree breast diameter measuring device according to claim 2, characterised in that: The sliding block (8) and one end of the sliding groove (7) are provided with a push spring (11).

4. A forestry tree breast diameter measuring device according to claim 3, characterised in that: It also includes a pull rope (12), a first pull rope ring (13) is arranged on one end of the inner side of the chain rod (5), a second pull rope ring (14) is arranged on the slide rod (1), the middle position of the pull rope (12) passes through the second pull rope ring (14), and the two ends of the pull rope (12) pass through the first pull rope ring (13) on both sides and are fixedly connected to the sliding block (8) on the side.

5. A forestry tree breast diameter measuring device according to claim 4, characterised in that: The middle position of the pull rope (12) passes through the second pull rope ring (14) and is sleeved on the pulley (15), the pulley (15) is fixedly arranged on the sliding sleeve (16), and the sliding sleeve (16) is slidably arranged on the slide rod (1).

6. A forestry tree breast diameter measuring device according to claim 5, characterised in that: The side surface of the slide rod (1) is provided with a handle (17).

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