Multifunctional measuring sighting rod

Abstract

The invention discloses a multifunctional measuring sighting rod which comprises five sections of sighting rods which are mutually independent, namely a sighting rod I, a sighting rod II, a sighting rod III, a sighting rod IV and a sighting rod V, the sighting rod I, the sighting rod II, the sighting rod III, the sighting rod IV and the sighting rod V are sequentially connected through buckle structures. The sighting rod I, the sighting rod II, the sighting rod III, the sighting rod IV and the sighting rod V are sequentially provided with scales, horizontal mechanisms and fluorescent coatings from top to bottom; telescopic mechanisms are arranged at the top ends of the sighting rod III, the sighting rod IV and the sighting rod V, a soil drilling mechanism 1 is arranged at the bottom end of the sighting rod I, and a measuring mechanism is arranged in the sighting rod II. Through the arrangement of the detachable rotary buckle structures, all the sections of the sighting rods can be rapidly connected, and the effect of being convenient to carry is achieved. Through the arrangement of the horizontal mechanism, during perimeter measurement, leveling of the rod body can be assisted, and the perimeter measurement precision is improved. Through the arrangement of the scales, the process of measuring by using a measuring tape is omitted.

Description

Technical Field

[0001] The invention belongs to the technical field of forest plot measurement, and in particular relates to a multifunctional measuring rod. Background Art

[0002] During forest resource planning and surveys, it's often necessary to establish circular, square, strip, or triangular plots within a small area using random, mechanical, or other sampling methods. The survey factors are then measured within the plots. This requires carrying a large number of instruments and tools, such as compasses, measuring rods, height gauges, tape measures, tree girth rulers, triangular rulers, and GPS. Survey plots are often located in remote areas, often in remote areas. Carrying a large number of instruments significantly increases the burden on surveyors and hinders work efficiency. Furthermore, traditional measuring rods are relatively outdated, with a single design and often employing articulated aluminum structures, making them difficult to carry. Furthermore, they are inconvenient to use in complex terrain and difficult to disassemble, resulting in low work efficiency.

[0003] The existing patent CN217276210U discloses a flower pole for forestry survey and mapping, wherein a conical insertion rod is fixed to the lower end of the accommodating cylinder, and an up-and-down movable rod with a light function is placed at the inner end of the accommodating cylinder, wherein a friction and compression pad connected with glue is embedded in the middle side of one end of the up-and-down movable rod, and an adjusting screw connected with a thread is arranged through one side of the upper end of the accommodating cylinder. This structure can make the upper part of the flower pole have the function of lighting, which solves the technical problem that there are many obstructions in the forest, which is not conducive to observation. However, the flower pole still has a single function and has no other usage scenarios except for perimeter measurement; and the flower pole introduces a light-emitting panel and a battery, but does not strengthen the waterproof protection and the battery is arranged at the upper end of the extension pole, which is very easy to get water in during field work, affecting work. Summary of the Invention

[0004] The main purpose of the invention is to solve the problems of the existing measuring flower rod having a single form, being difficult to carry and having low working efficiency.

[0005] To achieve the above-mentioned objectives, the present invention provides a measuring flower rod with multifunctional uses, comprising five independent flower rods, namely flower rod I, flower rod II, flower rod III, flower rod IV, and flower rod V; flower rod I, flower rod II, flower rod III, flower rod IV, and flower rod V are connected in sequence by a snap-fit ​​structure; flower rod I, flower rod II, flower rod III, flower rod IV, and flower rod V are sequentially provided with scales, a horizontal mechanism, and a fluorescent coating from top to bottom; the tops of flower rods III, flower rod IV, and flower rod V are all provided with telescopic mechanisms, the bottom of flower rod I is provided with a soil drilling mechanism, and a measuring mechanism is provided inside flower rod II.

[0006] Furthermore, the flower stem I, flower stem II, flower stem III, flower stem IV, and flower stem V are all equipped with a storage structure.

[0007] Furthermore, the storage structure includes a cloth bag, an anti-collision gasket, a shoulder pad and a spirit level fixing bag; the cloth bag is used to store flower stem I, flower stem II, flower stem III, flower stem IV4, and flower stem V. The bottom of the cloth bag is equipped with an anti-collision gasket, the cloth bag shoulder strap is equipped with a shoulder pad, and the cloth bag flap is equipped with a spirit level fixing bag.

[0008] Furthermore, the buckle structure includes a rotating buckle, a slot, and a wear-resistant and waterproof pad; the outer edges of the top ends of the flower rods I, II, III and IV are fixedly connected with a rotating buckle, and the outer edges of the rotating buckle are provided with a protrusion; the bottom ends of the flower rods II, III, IV and V are provided with a slot, and the slot matches the rotary buckle protrusion structure; the adjacent flower rods are axially aligned with the slot through the rotating buckle and then rotated 30°~90° to lock, and the connection is released by reverse rotation; the wear-resistant and waterproof pad is fixed to the bottom end of the rotating buckle, and when the buckle and the slot are locked, the wear-resistant and waterproof pad is in contact with the top plane of the adjacent flower rods.

[0009] Furthermore, the horizontal structure includes a spirit level body and 3M Velcro; the spirit level and the flower rod I, flower rod II, flower rod III, flower rod IV4, and flower rod V are all detachably connected via 3M Velcro.

[0010] Furthermore, the telescopic structure includes: Three built-in pull-out rods are connected to the main bodies of flower rods III, IV, and V through hinged shafts, and the tails are fixed with press-adjustable buckles; The snap-fit ​​groove is located at 90° of the hinge axis. When the pull rod is rotated to 90° around the hinge axis, the snap-fit ​​groove cooperates with the protrusions inside the main body of the flower rod III, flower rod IV, and flower rod V to achieve initial positioning. The push-adjusting buckle pops out after being operated and locks with the slot on the inner wall of the flower rod body to limit the axial displacement of the pull rod.

[0011] Furthermore, the soil drilling mechanism includes a drill bit, which is fixed to the bottom of the lower end of the flower rod I; a folding handle and a foot pedal, which are fixed to the flower rod I through a hinge axis and can rotate around the hinge axis within the range of 0° to 90°; a push plate is built into the inside of the flower rod I; a storage groove is provided on the outer wall of the flower rod I, a snap-fit ​​part is provided on the top of the groove, and a card is provided at the end of the folding handle and the foot pedal, which is folded and stored by snapping the card with the snap-fit ​​part.

[0012] Furthermore, the measuring mechanism includes a spiral ruler groove, which is arranged inside the flower stem II; a ruler opening is opened on the outer wall of the flower stem II opposite to the spiral groove, and the fiber ruler strip is tightened in the spiral ruler groove through the ruler opening. The brake is installed on the outer wall of the flower stem II, one end of the ruler spring is fixed to the inner wall of the flower stem II, and the other end is connected to the end of the fiber ruler strip. Beneficial effects: 1. The present invention provides a storage structure so that the flower stems can be put into a dustproof and waterproof Oxford cloth bag, and the whole can be placed in a stem barrel for storage, achieving the effect of not being easily damaged and convenient to carry. The present invention provides a detachable rotating buckle structure so that each section of the flower stem can be quickly connected, the connection is tighter, the durability is stronger, and the effect of being convenient to carry is achieved. The present invention provides a horizontal mechanism so that when measuring the perimeter, it can assist in leveling the stem body and improve the accuracy of the perimeter measurement. The present invention provides a scale so that the height of herbaceous shrubs can be directly measured during the understory vegetation survey, eliminating the process of measuring with a tape measure.

[0013] 2. The present invention uses a fluorescent coating to allow the flower stem to absorb sunlight and then emit light in the forest environment, which is beneficial for surveyors to use a compass to observe the position of the flower stem and improve observation efficiency. The present invention uses a telescopic mechanism to allow the flower stem to form a 1x1 meter and 2x2 meter vegetation survey frame through telescopic combination, eliminating the problem of carrying additional sample frames for forest surveys. The present invention uses a soil drill mechanism to allow the flower stem to have a built-in labor-saving soil drill with a foot pedal, which can be used for soil sample collection and can be inserted into the soil for fixation when measuring the perimeter, eliminating the problem of carrying additional soil drills for forest surveys. The present invention uses a perimeter measurement mechanism to allow the flower stem to have a built-in spiral fiber tape measure. During the perimeter measurement process, the staff only needs to hold the flower stem to pull out the tape measure to measure the length at the same time, eliminating the trouble of carrying the flower stem in one hand and the tape measure in the other hand, thereby improving measurement efficiency. The present invention uses a breast diameter measurement mechanism to allow the built-in spiral fiber tape measure of the flower stem to directly measure the breast diameter, thereby ensuring measurement accuracy and achieving the effect of improving work quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the flower stem provided by the present invention; Figure 2 This is a schematic diagram of the flower stem storage bag provided by the present invention; Figure 3 This is a schematic diagram of the detachable rotating buckle structure of the flower rod provided by the present invention; Figure 4 It is a schematic diagram of the horizontal structure provided by the present invention; Figure 5 This is a schematic structural diagram of the telescopic machine provided by the present invention; Figure 6 It is a structural schematic diagram of the soil drilling rig provided by the present invention; Figure 7 It is a schematic diagram of the perimeter and breast diameter measurement mechanism provided by the present invention.

[0015] Figure 1: 1-flower rod I, 2-flower rod II, 3-flower rod III, 4-flower rod IV, 5-flower rod V, 6-storage structure, 601-cloth bag, 602-anti-collision gasket, 603-shoulder pad, 604-level fixing belt, 7-buckle structure, 701-rotating buckle, 702-card slot, 703-waterproof pad, 8-scale, 9-fluorescent coating, 10-level mechanism, 101-level body, 102-velcro, 11-telescopic mechanism, 1 101- Pull rod, 1102- Adjustment buckle, 1103- Hinge shaft, 1104- Snap slot, 12- Drill mechanism, 1201- Drill bit, 1202- Folding handle, 1203- Foot pedal, 1204- Hinge shaft I, 1205- Push plate, 1206- Buckle, 1207- Card, 13- Measuring mechanism, 1301- Spiral ruler groove, 1302- Fiber ruler strip, 1303- Brake, 1304- Ruler spring, 1305- Ruler mouth. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1: like Figure 1-7 As shown, a multifunctional measuring stem comprises five independent stems, namely stem I1, stem II2, stem III3, stem IV4, and stem V5. Stems I1, II2, III3, IV4, and V5 are each equipped with a storage structure 6. Stems I1, II2, III3, IV4, and V5 are connected in sequence by a detachable rotating buckle structure 7. Stems I1, II2, III3, IV4, and V5 are sequentially provided with scales 8, a horizontal mechanism 10, and a fluorescent coating 9 from top to bottom. A telescopic mechanism 11 is provided at the center of the top of each stem III3, IV4, and V5. A soil drilling mechanism 12 is provided at the bottom of stem I1. A perimeter and diameter-at-breast height measuring mechanism 13 is provided inside stem II2.

[0019] The storage structure 6 includes a dustproof and waterproof Oxford cloth bag 601, an anti-collision gasket 602, a shoulder pad 603, and a spirit level fixing bag 604. Flower stems I1, II2, III3, IV4, and V5 can be stored in the cloth bag 601. The bottom of the cloth bag 601 is equipped with an anti-collision gasket 602, the shoulder pad 603 is equipped on the shoulder strap of the cloth bag 601, and the spirit level fixing bag 604 is equipped on the flap of the cloth bag 601.

[0020] The removable, rotatable buckle structure 7 includes a rotating buckle 701, a slot 702, and a wear-resistant, waterproof pad 703. The outer edges of the tops of the flower stems I1, II2, III3, and IV4 are fixedly connected to the rotating buckle 701, which has a raised structure on the outer edge to achieve rotational locking. The bottoms of the flower stems II2, III3, IV4, and V5 each have a slot 702 that mates with the raised structure of the rotating buckle 701. Rotating the rotating buckle 701 30° to 90° secures the rotating buckle 701 and slot 702 on adjacent flower stems. Adjacent flower stems are locked by aligning the axes of the buckle and slot structures and then rotating to form a continuous rod. In operation, the rotatable buckle 701 is coupled to the slot 702. Rotating the rotatable buckle 701 30-90 degrees connects the rotatable buckle 701 to the slot 702. In non-operational mode, rotating the rotatable buckle 701 in the opposite direction by 30-90 degrees releases the rotatable buckle 701 from the slot 702. A wear-resistant waterproof pad 703 is fixed to the bottom of the rotatable buckle 701 and contacts the top surface of the adjacent flower stem to prevent sand intrusion and reduce wear.

[0021] The horizontal structure 10 includes a spirit level body 1001 and a 3M Velcro 1002. The spirit level 1001 and the flower stems I1, II2, III3, IV4 and V5 are detachably connected via the 3M Velcro 1002 and can be fixedly stored in the spirit level fixing bag 604 in the cloth bag 601 when not in use.

[0022] The telescopic mechanism 11 includes three built-in pull rods 1101, a push-adjustment buckle 1102, a hinge shaft 1103, and a snap-in slot 1104. The pull rod 1101 is built into the flower rod III3 and connected to the flower rod III3 via the hinge shaft 1103. The push-adjustment buckle 1102 is fixed to the tail of the pull rod 1101; the snap-in slot 1104 is located at a 90-degree position of the hinge shaft 1103. When the pull rod 1101 rotates to a specific angle around the hinge shaft 1103, it cooperates with the corresponding structure on the flower rod III3. The connection method and structural relationship of the telescopic mechanism 11 of the flower rod IV4 and flower rod V5 are consistent with those of the flower rod III3 and will not be repeated here.

[0023] The pull-out rod 1101 is built into the flower rod III3 and is connected to the flower rod III3 through the hinge shaft 1103. When the pull-out rod 1101 needs to be extended, the pull-out rod 1101 rotates around the hinge shaft 1103, rotates out from the flower rod III3 and gradually extends. The snap-in groove 1104 is located at a 90-degree position of the hinge shaft 1103. During the rotation of the pull-out rod 1101, when the pull-out rod 1101 forms a 90-degree angle with the flower rod III3, the snap-in groove 1104 will initially cooperate with the corresponding protrusion or snap-in groove structure on the flower rod III3, limiting the pull-out rod 1101 from continuing to rotate around the hinge shaft 1103, so that the pull-out rod 1101 has a relatively stable position in the direction perpendicular to the flower rod III3, preventing it from excessive rotation or accidental rotation. The press-adjust buckle 1102 is fixed to the tail of the pull-out rod 1101. When the pulling rod 1101 is initially positioned in the snap-in groove 1104 and maintains a relatively stable extension angle, the user can continue to pull the pulling rod 1101 to further extend it along the axial direction of the flower rod III3 according to actual needs. At this time, the press-adjust buckle 1102 is in an operable state. The user presses the buckle, and the buckle pops out and snaps into the corresponding slot on the flower rod III3 or fits tightly with the specific structure on the inner wall of the flower rod III3, thereby locking the position of the pulling rod 1101 in the axial direction, preventing it from retracting or shaking during use, and finally locking the position of the pulling rod. The working principle of the telescopic mechanism 11 of the flower rod IV4 and the flower rod V5 is consistent with the working principle of the telescopic mechanism 11 in the flower rod III3, and will not be repeated here.

[0024] The soil drilling mechanism 12 includes a drill bit 1201, a folding handle 1202, a foot pedal 1203, a hinge shaft 1204, and a push plate 1205. The drill bit 1201 is fixed to the bottom of the lower end of the flower stem I1. The folding handle 1202 and foot pedal 1203 are both fixed to the flower stem I1 via the hinge shaft 1204. The foot pedal 1203 is located below the folding handle 1202. Both the foot pedal 1203 and the folding handle 1202 can rotate about the hinge shaft 1204 within a range of 0° (stowed position) to 90° (operating position), enabling the foot pedal 1203 and folding handle 1202 to transition between an extended operating position and a folded, stowed position. When the folding handle 1202 and foot pedal 1203 are opened, they form a 90° angle with the flower stem I1. The push plate 1205 is internal to the flower stem I1. The outer surface of the flower stem I1 is provided with a groove that matches the folding handle 1202 and the footrest 1203 and is used to store the folding handle 1202 and the footrest 1203. A latch 1206 is provided at the top of the groove. A clip 1207 is provided on the end of the folding handle 1202 and the footrest 1203 away from the hinge shaft 1204. The clip 1207 is engaged with the latch 1206, so that the folding handle 1202 and the footrest 1203 are stored in the groove of the flower stem I1.

[0025] Measuring mechanism 13 comprises a spiral ruler groove 1301, a fiber ruler strip 1302, a brake 1303, a ruler spring 1304, and a ruler opening 1305. Screw ruler groove 1301 is located within stem II2. A ruler opening 1305 is defined on the outer wall of stem II2 opposite to screw ruler groove 1301. Fiber ruler strip 1302 is tightened within screw ruler groove 1301 within stem II2 via ruler opening 1305. Brake 1303 is mounted on the outer wall of stem II2. Rule spring 1304 is located within stem II2. One end of rule spring 1304 is fixed to the inner wall of stem II2, and the other end is directly connected to the end of fiber ruler strip 1302 near ruler opening 1305, forming an elastic traction structure.

[0026] When fiber ruler 1302 is pulled outward through ruler opening 1305, it unwinds along the spiral path of spiral ruler groove 1301. At this point, ruler spring 1304 elastically deforms and accumulates energy due to the applied force. After the measurement is complete, brake 1303 physically locks the surface of fiber ruler 1302 by pressing against it, fixing the measurement value and preventing retraction-induced errors. When brake 1303 is released, ruler spring 1304 releases its stored elastic potential energy, driving fiber ruler 1302 to rotate back along spiral ruler groove 1301, forming a uniformly wound state and preventing tangling or misalignment.

[0027] The multifunctional measuring flower rod of the present invention can improve the measurement efficiency of the flower rod in perimeter measurement. At the same time, the introduction of multiple components also enhances the functionality of the flower rod, greatly improves the efficiency of forest resource surveys, and reduces the burden of carrying instruments for investigators.

[0028] The working principle of a multifunctional measuring flower rod is as follows: Sample plot measurement includes perimeter measurement, sample plot survey, and soil sampling. In the field, the staff must first carry the measuring tools and walk to the sample plot according to the sample plot coordinates. In this process, the staff needs a lightweight storage structure. The present invention uses the storage structure to allow the flower stems to be placed in a dustproof and waterproof Oxford cloth bag 601, and the entire stem can be placed in a stem barrel for storage, achieving the effect of not being easily damaged and convenient to carry; through the setting of the detachable and rotatable snap structure 7, the flower stems of each section can be quickly connected, the connection is tighter, the durability is stronger, and the effect of being easy to carry is achieved. After arriving at the sample plot, the staff needs to carry out perimeter measurement and lay out circular, square, strip or angled sample plots through random, mechanical or other sampling methods. This process mainly relies on tools such as a compass, flower stems and a tape measure. By fixing the direction with a compass, the staff can walk along the direction holding the flower pole. The perimeter and diameter at breast height measuring mechanism 13 can replace the tape measure to complete the boundary length direction measurement. The setting of the horizontal mechanism 10 can assist the pole body in leveling during perimeter measurement, thereby improving the accuracy of perimeter measurement. The setting of the fluorescent coating 9 allows the flower pole to absorb sunlight and then emit light in the forest environment, which is beneficial for the surveyor to use the compass to observe the position of the flower pole and improve the observation efficiency. After completing the perimeter measurement, the flower pole generally completes the measurement task. The next step is to measure the diameter at breast height of the trees in the sample plot. The diameter at breast height measurement requires measuring the diameter at breast height at 1.3m from the tree. The present invention can utilize the setting of the diameter at breast height measuring mechanism of the flower pole so that the built-in spiral fiber tape measure of the flower pole can directly measure the diameter at breast height, thereby ensuring the measurement accuracy and achieving the effect of improving the work quality. In addition, it is necessary to carry out vegetation sample surveys, which are carried out in the form of vegetation sample frames. Previous surveys often used tape measures or homemade sample frames, which were time-consuming to set up and inconvenient to carry. The present invention uses the telescopic mechanism 11 to allow the flower rod to form 1x1 meter and 2x2 meter vegetation survey frames through telescopic combination, eliminating the problem of carrying extra sample frames for forest surveys. In the past, soil sampling usually involved carrying a soil drill, which was heavy and inconvenient to carry. The present invention uses the soil drill mechanism to allow the flower rod to have a labor-saving soil drill with a foot pedal built into it, which can be used to collect soil samples and can also be inserted into the soil for fixation when measuring the perimeter, eliminating the problem of carrying extra soil drills for forest surveys.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional measuring rod, characterized in that: The invention comprises five mutually independent flower stems, namely flower stem I, flower stem II, flower stem III, flower stem IV and flower stem V; flower stem I, flower stem II, flower stem III, flower stem IV and flower stem V are sequentially connected by a snap-fit ​​structure; flower stem I, flower stem II, flower stem III, flower stem IV and flower stem V are sequentially provided with scales, a horizontal mechanism and a fluorescent coating from top to bottom; the tops of flower stems III, flower stem IV and flower stem V are all provided with a telescopic mechanism, the bottom end of flower stem I is provided with a soil drilling mechanism, and the interior of flower stem II is provided with a measuring mechanism.

2. The multifunctional measuring rod according to claim 1, characterized in that: Flower rod I, flower rod II, flower rod III, flower rod IV, and flower rod V are all equipped with storage structures.

3. The multifunctional measuring rod according to claim 2, characterized in that: The storage structure includes a cloth bag, an anti-collision gasket, a shoulder pad and a spirit level fixing bag; the cloth bag is used to store flower pole I, flower pole II, flower pole III, flower pole IV and flower pole V, the bottom of the cloth bag is equipped with an anti-collision gasket, the cloth bag shoulder strap is equipped with a shoulder pad, and the cloth bag flap is equipped with a spirit level fixing bag.

4. The multifunctional measuring rod according to claim 1, characterized in that: The buckle structure includes a rotating buckle, a slot, and a wear-resistant and waterproof pad; the outer edges of the top ends of the flower rods I, II, III and IV are fixedly connected with a rotating buckle, and the outer edges of the rotating buckle are provided with a protrusion; the bottom ends of the flower rods II, III, IV and V are provided with a slot, and the slot matches the protrusion structure of the rotating buckle; the adjacent flower rods are axially aligned with the slot through the rotating buckle and then rotated 30°~90° to lock, and the connection is released by reverse rotation; the wear-resistant and waterproof pad is fixed to the bottom end of the rotating buckle, and when the buckle and the slot are locked, the wear-resistant and waterproof pad is in contact with the plane of the top ends of the adjacent flower rods.

5. The multifunctional measuring rod according to claim 1, characterized in that: The level structure includes a spirit level body and 3M Velcro; the spirit level and the flower rod I, flower rod II, flower rod III, flower rod IV4, and flower rod V are all detachably connected via 3M Velcro.

6. The multifunctional measuring rod according to claim 1, characterized in that: The telescopic structure includes: The three built-in pull-out rods are connected to the main bodies of flower rods III, IV, and V respectively through hinged shafts, with fixed press-adjustment buckles at the tails. After pressing the adjustment buckles, they pop out and lock with the inner wall slots of flower rods III, IV, and V to limit the axial displacement of the pull-out rods. The snap-fit ​​groove is located at 90° of the hinge axis. When the pull rod is rotated to 90° around the hinge axis, the snap-fit ​​groove cooperates with the protrusions inside the main body of the flower rod III, flower rod IV, and flower rod V to achieve initial positioning.

7. The multifunctional measuring rod according to claim 1, characterized in that: The soil drilling mechanism includes a drill bit, which is fixed to the bottom of the lower end of the flower rod I; the folding handle and the foot pedal are fixed to the flower rod I through a hinge shaft, and can rotate around the hinge shaft within the range of 0° to 90°; the push plate is built into the inside of the flower rod I; the outer wall of the flower rod I is provided with a storage groove, the top of the groove is provided with a snap fastener, and the ends of the folding handle and the foot pedal are provided with a card, which is folded and stored by snapping the card with the snap fastener.

8. The multifunctional measuring rod according to claim 1, characterized in that: The measuring mechanism includes a spiral ruler groove, which is arranged inside the flower stem II; a ruler opening is opened on the outer wall of the flower stem II opposite to the spiral groove, and the fiber ruler strip is tightened in the spiral ruler groove through the ruler opening. The brake is installed on the outer wall of the flower stem II, one end of the ruler spring is fixed to the inner wall of the flower stem II, and the other end is connected to the end of the fiber ruler strip.

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