Measuring tool

Abstract

The invention relates to the technical field of measurement, and particularly discloses a measuring tool which comprises a rod body, and the outer surface of the upper end of the rod body is fixedly connected with measuring equipment; the fine adjustment assembly is located on the outer surface, close to the lower end, of the rod body and can perform fine adjustment on the rod tip when the datum point is measured; the triggering assembly is located at the position, close to the middle, of the rod body, the triggering assembly can rapidly unfold the fine adjustment assembly, the fine adjustment assembly is arranged and used for supporting the rod body, and therefore a user can conveniently align a rod tip to a sample placing point with one hand, and through cooperation of a buffering rod, a buffering groove and an air hole (391), when the rod body is pushed, the rod tip is not prone to falling off. The pushing speed of the rod body is gradually reduced (or the resistance for pushing the rod body is increased) to increase the moving precision of the rod tip, the situation that the rod tip shakes is avoided, the rod tip can be inserted into the surface of a sample placing point at a time, the sample placing efficiency is improved, a user can unfold the support by pinching the pressing plate with one hand by arranging the triggering assembly, and operation is easy and fast.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, specifically to a measuring tool. Background Technology

[0002] Land surveying is the work of measuring and mapping the quantity, distribution, topographic features, and other characteristics of various types of land using surveying and remote sensing techniques. It includes topographic surveying, cadastral surveying, land leveling surveying, land use status surveying, and investigation of reserve resources such as barren hills and wastelands.

[0003] When measuring the area or volume of land, the instruments and tools required include: total station, GPS RTK, level, handheld laser rangefinder, infrared photoelectric rangefinder, steel tape, compass, tape measure, etc. Among them, RTK can measure many parameters such as earthwork volume and earthwork area, and its low cost has made it widely used in land area measurement projects. There are two types of RTK layout methods: one is traditional layout, which requires a level to be centered, and the other requires opening the guide to use inclined layout. The wheelless layout requires fine-tuning near the target point. However, the RTK structure is rod-shaped, and layout is often operated with one hand. When fine-tuning, the position of the rod tip needs to be adjusted with one hand to align it with the target point. During operation, because the rod lacks a fulcrum, relying solely on manual layout will cause the rod to shake, resulting in low layout efficiency.

[0004] Therefore, we propose a measurement tool. Summary of the Invention

[0005] The purpose of this invention is to provide a measuring tool to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a measuring tool, comprising a rod, wherein a measuring device is fixedly connected to the outer surface of the upper end of the rod;

[0007] The fine-tuning component is located on the outer surface of the rod near the lower end, allowing for fine adjustments to the rod tip when measuring the reference point.

[0008] The trigger component is located near the center of the rod and can quickly deploy the fine-tuning component.

[0009] Preferably, the fine-tuning component includes a guide groove, inside which a guide block is slidably connected. The end of the guide block away from the guide groove is connected to a sliding part. The lower end of the sliding part is rotatably connected to a bracket via a rotating shaft. A sliding groove is provided on the side of the bracket near the annular outer surface of the rod. A sliding block is provided inside the sliding groove. The sliding block is fixedly connected to the rod. The sliding groove is designed with an inclined structure. The upper outer surface of the bracket is fixedly connected to the sliding part by a spring.

[0010] Preferably, the sliding part includes a hinge ball, which is sleeved on the annular outer surface of the rod. The end of the guide block away from the guide groove is fixedly connected to the inner surface of the hinge ball. A ball ring is sleeved on the annular outer surface of the hinge ball. The bracket is rotatably connected to the lower outer surface of the ball ring through a bearing. The end of the spring away from the bracket is fixedly connected to the outer surface of the hinge ball.

[0011] Preferably, there are three sets of supports. The ball ring is located in the middle of the outer surface of the hinge ball ring. A blocking block is fixedly connected to the ball ring and the corresponding outer surface of the support ring. A spring is fixedly connected between the guide block and the guide groove.

[0012] Preferably, the triggering component includes a pressing plate, which is rotatably connected to the annular outer surface of the rod body via a rotating shaft. A compression chamber is provided inside the rod body at a position corresponding to the pressing plate. A compression plate is slidably connected inside the compression chamber and is located on one side of the compression chamber. A spring is fixedly connected between the compression chamber and the compression plate. A push-in groove is provided at the lower end of the inner surface of the compression chamber. A push-in rod is slidably connected inside the push-in groove. The lower outer surface of the push-in rod is fixedly connected to the upper end of the guide block. A trigger rod is fixedly connected at the end of the compression plate away from the spring. A reserved groove is provided at a position corresponding to the trigger rod. The trigger rod passes through the reserved groove and contacts the pressing plate.

[0013] Preferably, a spring four is fixedly connected between the pressing plate and the rod body. The spring four is located near the position where the pressing plate and the rod body are rotatably connected. The push-in groove is located on the side of the compression chamber away from the pressing plate. A spring piece is fixedly connected to one end of the annular outer surface of the rod body near the end of the pressing plate. A triangular structure design bayonet is fixedly connected to the upper outer surface of the spring piece. The bayonet is located in the middle of the spring plate.

[0014] Preferably, there are two sets of guide blocks. One set is fixedly connected to the push rod, and the other set has a buffer rod fixedly connected to the upper outer surface. A buffer groove is opened at the corresponding position of the rod and the buffer rod. The buffer rod is inserted into the buffer groove and the two are sealed. A vent hole (391) is opened through the annular outer surface of the rod. There are several sets of vent holes (391), and all of them are connected to the buffer groove.

[0015] Preferably, the fine-tuning component also includes a horizontal component, which fixes the outer surface of the connecting rod. The bracket has a telescopic groove inside, and a telescopic rod is slidably connected inside the telescopic groove. An overflow hole (305) is opened on the surface of the telescopic rod. Electrorheological fluid is injected into the telescopic groove, and the electrorheological fluid is controlled by the horizontal component.

[0016] Preferably, the leveling component includes a support block, which is fixedly connected to the annular outer surface of the rod. A level is fixedly connected to the upper outer surface of the support block, and the level is fixedly connected to the outer surface of the rod. A contact point one is fixedly connected to the middle position of the inner surface of the level, and a contact point two is fixedly connected around the contact point one. A switching groove is provided inside the support block, and an electromagnet one and an electromagnet two are fixedly connected to the two ends of the switching groove, respectively. A switching block made of magnetic metal is slidably connected inside the switching groove, and a switch is fixedly connected to one end of the switching block.

[0017] This invention has at least the following beneficial effects:

[0018] By setting up a fine-tuning component to provide support for the rod, the user can easily align the rod tip with the layout point with one hand. Through the cooperation of the buffer rod, buffer groove and vent (391), the pushing speed of the rod is gradually reduced (or the resistance of the pushing rod is increased) to increase the accuracy of the rod tip movement and avoid the rod tip shaking. Thus, it can be inserted into the layout point surface in one go, improving the layout efficiency. By setting up a trigger component, the user can unfold the support by squeezing the press plate with one hand, which is simple and quick to operate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the rod structure of the present invention;

[0021] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0022] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B;

[0023] Figure 5 This is an exploded view of the fine-tuning component of the present invention;

[0024] Figure 6 This is a schematic diagram of the sliding groove and sliding block of the present invention;

[0025] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C;

[0026] Figure 8 This is a schematic diagram of the cut-out side view of the rod body of the present invention;

[0027] Figure 9 This is a schematic diagram of the explosion structure of the triggering component of the present invention;

[0028] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point D;

[0029] Figure 11 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0030] Figure 12 For the present invention Figure 11 Enlarged structural diagram at point E in the middle.

[0031] In the diagram: 1. Rod body; 2. Trigger assembly; 20. Press plate; 21. Compression chamber; 22. Compression plate; 23. Trigger rod; 24. Reserved slot; 25. Spring piece; 26. Bayonet; 27. Spring three; 28. Push-in groove; 29. ​​Spring four; 3. Fine-tuning assembly; 30. Bracket; 301. Sliding block; 302. Sliding groove; 303. Telescopic groove; 304. Telescopic rod; 305. Overflow hole; 31. Hinge ball; 311. Guide block; 32. Ball ring; 33. Guide groove; 34. Spring 2; 35. Spring 1; 36. Buffer rod; 37. Push rod; 38. Blocking block; 39. Buffer groove; 391. Vent hole; 4. Horizontal assembly; 40. Support block; 41. Level; 42. Contact 2; 43. Contact 1; 44. Switching groove; 45. Switching block; 46. Electromagnet 1; 47. Electromagnet 2; 48. Switch. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-12 The present invention provides a technical solution:

[0034] Example 1,

[0035] A measuring tool includes a rod 1, with a measuring device fixedly connected to the outer surface of the upper end of the rod 1;

[0036] The fine-tuning component 3 is located on the outer surface of the lower end of the rod 1. When measuring the reference point, the tip of the rod can be finely adjusted, providing a fulcrum for the rod 1 and facilitating manual adjustment.

[0037] Trigger component 2 is located near the middle of lever 1. Trigger component 2 can quickly deploy fine-tuning component 3, simplifying the user's operation steps.

[0038] The fine-tuning component 3 includes a guide groove 33, inside which a guide block 311 is slidably connected. The end of the guide block 311 away from the guide groove 33 is connected to a sliding part. The lower end of the sliding part is rotatably connected to a bracket 30 via a rotating shaft. A sliding groove 302 is provided on the side of the bracket 30 near the annular outer surface of the rod 1. A sliding block 301 is provided inside the sliding groove 302. The sliding block 301 is fixedly connected to the rod 1. The sliding groove 302 is designed with an inclined structure. The upper outer surface of the bracket 30 is fixedly connected to the sliding part by a spring 35. The two ends of the spring 35 are fixedly connected to the hinge ball 31 and the bracket 30 respectively, generating a pulling force to house the bracket 30 on the outer surface of the rod 1.

[0039] The user unfolds the bracket 30 in the fine-tuning component 3 by triggering component 2. Then the sliding part moves downward along the guide groove 33. During the downward sliding of the bracket 30, the sliding groove 302 will contact the sliding block 301. Since the sliding groove 302 is designed with an inclined structure, the sliding block 301 resists the sliding groove 302 to open the bracket 30 and stretch the spring 35. At this time, until the length of the bracket 30 exceeds the tip of the rod, the user inserts the bracket 30 into the ground to provide support for the rod 1. This makes it convenient for the user to use the bracket 30 as a fulcrum to fine-tune the tip of the rod, thereby quickly aligning with the target point of the layout and improving the layout efficiency.

[0040] The sliding part includes a hinge ball 31, which is sleeved on the annular outer surface of the rod body 1. The end of the guide block 311 away from the guide groove 33 is fixedly connected to the inner surface of the hinge ball 31. A ball ring 32 is sleeved on the annular outer surface of the hinge ball 31. The bracket 30 is rotatably connected to the lower outer surface of the ball ring 32 through a bearing. The end of the spring away from the bracket 30 is fixedly connected to the outer surface of the hinge ball 31.

[0041] The hinge ball 31 slides downward together with the ball ring 32 via the guide block 311 and guide groove 33. The ball ring 32 can rotate on the annular outer surface of the hinge ball 31. The design of the hinge ball 31 and ball ring 32 makes it possible for the support 30 not to be parallel to the rod 1. When laying out, the user can lay out the rod 1 in an inclined position. At this time, the support 30 is rotatably connected to the outer surface of the ball ring 32. Under the action of the gravity of the support 30, the center of the three sets is perpendicular to the ground. At this time, the user can simply place the support 30 on the ground, then hold the rod 1 and visually align the rod tip with the laying point, and push the rod 1 towards the laying point. At this time, the hinge ball 31 and ball ring 32 support the rod 1 and are limited by the support 30. At the same time, the axes of the hinge ball 31 and ball ring 32 are at a certain angle, and the axis of the hinge ball 31 is consistent with the axis of the rod 1. The rod 1 moves towards the laying point along the guide block 311 via the guide groove 33. By providing support for the rod 1, the amplitude of fine adjustment sway is reduced, indirectly improving the laying efficiency.

[0042] There are three sets of brackets 30 to better support and limit the rod body 1. The ball ring 32 is located in the middle of the annular outer surface of the hinge ball 31, ensuring that the ball ring 32 can rotate around the hinge ball 31 at a certain angle. The ball ring 32 and the corresponding annular outer surface of the bracket 30 are fixedly connected to the blocking block 38 to limit the maximum opening angle of the bracket 30. The guide block 311 and the guide groove 33 are fixedly connected to the second spring 34. The design of the second spring 34 is that after the trigger component 2 is activated, the hinge ball 31 will automatically move downward under the pulling force generated by the second spring 34. At the same time, when the user pushes the rod body 1, the second spring 34 can provide a certain resistance to further reduce the amplitude of the rod tip shaking.

[0043] The trigger assembly 2 includes a pressing plate 20, which is rotatably connected to the annular outer surface of the rod body 1 via a rotating shaft. A compression cavity 21 is provided inside the rod body 1 at a position corresponding to the pressing plate 20. A compression plate 22 is slidably connected inside the compression cavity 21 and is located on one side of the compression cavity 21. A spring 3 27 is fixedly connected between the compression cavity 21 and the compression plate 22. A push-in groove 28 is provided at the lower end of the inner surface of the compression cavity 21. A push-in rod 37 is slidably connected inside the push-in groove 28. The lower outer surface of the push-in rod 37 is fixedly connected to the upper end of the guide block 311. A trigger rod 23 is fixedly connected at the end of the compression plate 22 away from the spring 3 27. A reserved groove 24 is provided at a position corresponding to the trigger rod 23 on the rod body 1. The trigger rod 23 passes through the reserved groove 24 and contacts the pressing plate 20.

[0044] After arriving at the layout area, the user places the support 30 and then pinches the pressing plate 20, causing the pressing plate 20 to rotate around the pivot point. The pressure is transmitted to the compression plate 22 through the trigger rod 23. The compression plate 22 slides inside the compression chamber 21, while squeezing the spring 27. The air inside the compression chamber 21 is then pushed through the injection groove 28 to press the injection rod 37, forcing the injection rod 37 to move downward. Together with the spring 34, the spring ball 31 is pulled downward, making the support 30 unfold faster.

[0045] A spring 29 is fixedly connected between the pressing plate 20 and the rod 1. The spring 29 is located near the position where the pressing plate 20 and the rod 1 are rotatably connected. The injection groove 28 is located on the side of the compression chamber 21 away from the pressing plate 20, ensuring that more gas inside the compression chamber 21 can enter the injection groove 28. A spring piece 25 is fixedly connected to one end of the annular outer surface of the rod 1 near the end of the pressing plate 20. A triangular structure design bayonet 26 is fixedly connected to the upper outer surface of the spring piece 25. The bayonet 26 is located in the middle of the spring plate.

[0046] Spring 4 29 is located near the pivot point, allowing the user to apply pressure to it using leverage, reducing the need for hand strength. When the pressing plate 20 is pressed to its limit, one end of the pressing plate 20 contacts the latch 26 on the surface of the spring 25, forcing the spring 25 to deform. At this time, the outer side of the pressing plate 20 contacts the latch 26 with its triangular structure, which restricts the rebound of the pressing plate 20, making it easier for the user to operate. If the layout is finished, the user can directly move the spring 25, and the pressing plate 20 will automatically reset under the action of spring 4 29. At the same time, spring 3 27 pushes the compression plate 22 to reset, drawing the gas inside the injection groove 28 back into the compression chamber 21. The injection rod 37 moves along the injection groove 28 under the pressure of the gas, causing the hinge ball 31 to move upward, while overcoming the tension generated by spring 2 34, allowing the fine adjustment component 3 to quickly reset, making it easier for the user to move around. The bracket 30 can be attached with a certain amount of magnetism, so that it can be attached to the outer surface of the rod 1, further facilitating the user's movement.

[0047] There are two sets of guide blocks 311. One set is fixedly connected to the push rod 37, and the other set has a buffer rod 36 fixedly connected to its upper outer surface. The rod body 1 and the buffer rod 36 are respectively provided with buffer grooves 39. The buffer rod 36 is inserted into the buffer groove 39 and the two are kept sealed. The annular outer surface of the rod body 1 is provided with vent holes 391. There are several sets of vent holes 391, and they are all connected to the buffer groove 39. When the user pushes the rod body 1 and inserts the rod tip into the placement point, the hinge ball 31 moves upward relative to the rod body 1. At this time, the buffer rod 36 will move along the inside of the buffer groove 39. The air inside the buffer groove 39 is discharged outward through the vent holes 391. As the buffer rod 36 gradually reaches the bottom of the buffer groove 39, the number of vent holes 391 gradually decreases and the amount of air flowing out also gradually decreases, thereby reducing the moving speed of the rod body 1 and reducing the shaking of the rod body 1 when it moves by increasing the resistance.

[0048] Example 2,

[0049] The fine-tuning component 3 also includes a horizontal component 4, which fixes the outer surface of the connecting rod 1. A telescopic groove 303 is provided inside the bracket 30, and a telescopic rod 304 is slidably connected inside the telescopic groove 303. An overflow hole 305 is provided on the surface of the telescopic rod 304. Electrorheological fluid is located inside the overflow hole 305 and is integrated with the electrorheological fluid inside the telescopic groove 303. When energized, it can fix and limit the telescopic rod 304. Electrorheological fluid is injected into the telescopic groove 303 and is controlled by the horizontal component 4. The horizontal component 4 includes a support block 40, which is fixed... A level 41 is fixedly connected to the upper outer surface of the support block 40, which is connected to the annular outer surface of the rod body 1. The level 41 is fixedly connected to the outer surface of the rod body 1. A contact 43 is fixedly connected to the middle position of the inner surface of the level 41. Several sets of contacts 42 are fixedly connected around the contact 43. A switching groove 44 is opened inside the support block 40. Electromagnets 46 and 47 are fixedly connected to the two ends of the switching groove 44 respectively. A switching block 45 made of magnetic metal is slidably connected inside the switching groove 44. A switch 48 is fixedly connected to one end of the switching block 45.

[0050] When the user determines the benchmark point using the traditional layout method, after the bracket 30 is opened and fixed, the position of the bubble inside the level 41 is adjusted. The liquid inside the level 41 is a conductive liquid. When the bubble is not in the center position of the level 41, the liquid inside the level 41 will contact the contact 43, energizing the contact 43. At this time, the electromagnet 46 inside the switching groove 44 is energized, attracting the switching block 45 and triggering the switch 48. At this time, the electrorheological fluid inside the telescopic groove 303 is de-energized and becomes flowable. (In this embodiment, the initial state of the electrorheological fluid is energized.) (State), the telescopic rod 304 moves toward the ground under its own weight. When the bubble is in the middle position of the level 41, contact 1 43 is no longer energized, and contact 2 42 is energized. At this time, electromagnet 2 47 is energized and magnetically attracts the switching block 45, causing the switch 48 to lose its pressure and return to the untriggered state. At this time, the electrorheological fluid inside the telescopic groove 303 continues to maintain the initial energized state. The solid electrorheological fluid fixes the telescopic rod 304, which makes it convenient for the user to locate the target on uneven ground. The rod body 1 is brought to vertical by the bracket 30 with the telescopic rod 304.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A measuring tool, comprising a rod (1), wherein a measuring device is fixedly connected to the outer surface of the upper end of the rod (1), characterized in that: Fine-tuning component (3) is located on the outer surface of the lower end of the rod (1) and can make fine adjustments to the tip of the rod when measuring the reference point; Trigger component (2), which is located near the middle of the rod (1), can quickly deploy the fine-tuning component (3).

2. The measuring tool according to claim 1, characterized in that: The fine-tuning component (3) includes a guide groove (33), a guide block (311) is slidably connected inside the guide groove (33), a sliding part is connected to the end of the guide block (311) away from the guide groove (33), a bracket (30) is rotatably connected to the lower end of the sliding part through a rotating shaft, a sliding groove (302) is provided on the side of the bracket (30) near the annular outer surface of the rod (1), a sliding block (301) is provided inside the sliding groove (302), the sliding block (301) is fixedly connected to the rod (1), the sliding groove (302) is designed with an inclined structure, and the upper outer surface of the bracket (30) is fixedly connected to the sliding part by a spring (35).

3. The measuring tool according to claim 2, characterized in that: The sliding part includes a hinge ball (31), which is sleeved on the annular outer surface of the rod body (1). The end of the guide block (311) away from the guide groove (33) is fixedly connected to the inner surface of the hinge ball (31). A ball ring (32) is sleeved on the annular outer surface of the hinge ball (31). The bracket (30) is rotatably connected to the lower outer surface of the ball ring (32) through a bearing. The end of the spring away from the bracket (30) is fixedly connected to the outer surface of the hinge ball (31).

4. The measuring tool according to claim 3, characterized in that: The number of brackets (30) is three sets. The ball ring (32) is located in the middle of the annular outer surface of the hinge ball (31). The ball ring (32) and the corresponding annular outer surface of the bracket (30) are fixedly connected with a blocking block (38). The guide block (311) and the guide groove (33) are fixedly connected with a spring (34).

5. The measuring tool according to claim 2, characterized in that: The triggering component (2) includes a pressing plate (20), which is rotatably connected to the annular outer surface of the rod (1) via a rotating shaft. A compression chamber (21) is provided inside the rod (1) at a position corresponding to the pressing plate (20). A compression plate (22) is slidably connected inside the compression chamber (21), and the compression plate (22) is located on one side of the compression chamber (21). A spring (27) is fixedly connected between the compression chamber (21) and the compression plate (22). 21) A push-in groove (28) is provided at the lower end of the inner surface. A push-in rod (37) is slidably connected inside the push-in groove (28). The lower outer surface of the push-in rod (37) is fixedly connected to the upper end of the guide block (311). A trigger rod (23) is fixedly connected to the end of the compression plate (22) away from the spring (27). A reserved groove (24) is provided at the corresponding position of the rod body (1) and the trigger rod (23). The trigger rod (23) passes through the reserved groove (24) and contacts the pressing plate (20).

6. The measuring tool according to claim 5, characterized in that: A spring four (29) is fixedly connected between the pressing plate (20) and the rod (1). The spring four (29) is located near the position where the pressing plate (20) and the rod (1) are rotatably connected. The push-in groove (28) is located on the side of the compression chamber (21) away from the pressing plate (20). A spring piece (25) is fixedly connected to one end of the annular outer surface of the rod (1) near the end of the pressing plate (20). A triangular structure design bayonet (26) is fixedly connected to the upper outer surface of the spring piece (25). The bayonet (26) is located in the middle of the spring plate.

7. The measuring tool according to claim 5, characterized in that: The guide blocks (311) are in two sets. One set is fixedly connected to the push rod (37), and the other set has a buffer rod (36) fixedly connected to the upper outer surface. The rod body (1) and the buffer rod (36) are provided with buffer grooves (39) at corresponding positions. The buffer rod (36) is inserted into the buffer groove (39) and the two are sealed. The annular outer surface of the rod body (1) is provided with vent holes (391). There are several sets of vent holes (391), and they are all connected to the buffer grooves (39).

8. The measuring tool according to claim 2, characterized in that: The fine-tuning component (3) also includes a horizontal component (4), which fixes the outer surface of the connecting rod (1). The bracket (30) has a telescopic groove (303) inside, and a telescopic rod (304) is slidably connected inside the telescopic groove (303). An overflow hole (305) is opened on the surface of the telescopic rod (304). Electrorheological fluid is injected into the telescopic groove (303), and the electrorheological fluid is controlled by the horizontal component (4).

9. The measuring tool according to claim 8, characterized in that: The horizontal component (4) includes a support block (40), which is fixedly connected to the annular outer surface of the rod (1). A level (41) is fixedly connected to the upper outer surface of the support block (40). The level (41) is fixedly connected to the outer surface of the rod (1). A contact point one (43) is fixedly connected to the middle position of the inner surface of the level (41). A contact point two (42) is fixedly connected around the contact point one (43). A switching groove (44) is opened inside the support block (40). Electromagnet one (46) and electromagnet two (47) are fixedly connected to the two ends of the switching groove (44) respectively. A switching block (45) made of magnetic metal is slidably connected inside the switching groove (44). A switch (48) is fixedly connected to one end of the switching block (45).

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