An excitation locking mechanism and a soil strength detector

Abstract

The present invention discloses an excitation locking mechanism and a soil strength detector. The excitation locking mechanism includes an installation cylinder and a limiting piece. An excitation pressure rod is slidably sleeved in the installation cylinder, and an excitation groove is formed on the side wall of the excitation pressure rod. The limiting piece is axially hinged to the external environment through a rotating shaft, and a reset torsion spring is sleeved on the rotating shaft. By setting the limiting piece to be rotatable and providing a reset torsion spring to position its initial position, when the limiting piece is in the initial position, it abuts against the excitation pressure rod, and the excitation pressure rod is used to limit it so that it cannot rotate in the triggering direction. The limiting piece in this state is used to lock the locked object. By providing an excitation groove on the side wall of the excitation pressure rod and arranging it in a staggered manner with the limiting piece, when unlocking is required, the excitation pressure rod is pressed to align the excitation groove with the limiting piece. The elastic potential energy accumulated by the locked object is converted into kinetic energy, squeezing the limiting piece and pressing the limiting piece into the excitation groove, causing the limiting piece to lose the locking effect on the locked object, and the locked object is ejected.

Description

Technical Field

[0001] The present invention relates to the technical field of locking mechanisms, and particularly to an excitation locking mechanism and a soil strength detector. Background Art

[0002] In the field of geotechnical engineering, the use of hand tools or devices is often involved. Some hand tools or devices are provided with mechanisms that convert elastic potential energy into kinetic energy. This part of the mechanism usually requires the user to compress the elastic member by hand pressure, accumulate elastic potential energy in the elastic member, and then remove the hand pressure to convert the accumulated elastic potential energy into kinetic energy. The conversion efficiency is high and it is convenient to use. However, such hand tools or devices still have the following problems:

[0003] When using hand pressure, in order to maintain the accumulation of elastic potential energy, the hand cannot leave the pressure application mechanism, and the person applying the force has been in a state of applying force, seriously consuming human power; the entire tool or device may also have other functions and components that need to be operated, but since the hand cannot leave the pressure application mechanism, the operation of other components cannot be implemented, and other functions cannot be enabled smoothly. Summary of the Invention

[0004] The purpose of the present invention is to provide an excitation locking mechanism and a soil strength detector, which can lock the mechanism that converts elastic potential energy into kinetic energy in the existing hand tools or devices, keep the elastic member in a compressed state, solve the technical problem of the need for continuous hand force of the user, and can be triggered as needed to release the lock.

[0005] The present invention is achieved by the following technical solutions:

[0006] An excitation locking mechanism includes: an installation cylinder, one end of the installation cylinder is connected to the external environment, and the other end is slidably sleeved with an excitation pressure rod, and an excitation groove is opened on the side wall of the excitation pressure rod; a limiting piece, the limiting piece is axially hinged to the external environment through a rotating shaft, the rotating shaft is arranged parallel to the excitation pressure rod, a return torsion spring is sleeved on the rotating shaft, one end of the return torsion spring is connected to the limiting piece, and the other end is connected to the external environment. When the return torsion spring is in a natural state, the limiting piece abuts against the excitation pressure rod so that the limiting piece cannot rotate in the triggering direction; when the excitation pressure rod is slid so that the excitation groove is aligned with the limiting piece, the limiting piece can be inserted into the excitation groove under the action of an external force so that the limiting piece can rotate in the triggering direction.

[0007] Optionally, a return spring is provided between the excitation pressure rod and the installation cylinder, and the relative sliding of the excitation pressure rod and the installation cylinder can compress or stretch the return spring. When the return spring is in a natural state, the limiting piece is misaligned with the excitation groove.

[0008] Optionally, the excitation pressure rod is provided with a limiting portion, the diameter of the limiting portion is larger than the diameter of the excitation pressure rod, the reset spring is arranged between the limiting portion and the mounting tube, one end of the reset spring abuts against the end surface of the limiting portion, and the other end abuts against the end surface of the mounting tube; the excitation groove is opened in the limiting portion.

[0009] Optionally, the limiting plate is strip-shaped, the rotating shaft is arranged in the middle of the limiting plate, and the abutment point between the excitation pressure rod and the limiting plate is one end of the limiting plate, so that the limiting plate can only rotate in the direction opposite to the triggering direction.

[0010] Optionally, the limiting plate is a trapezoidal plate, so that the limiting plate forms an extrusion surface at at least one oblique edge, and extruding the extrusion surface can cause the limiting plate to rotate in a direction opposite to the triggering direction; the limiting plate forms a clamping surface at the lower bottom, and the clamping surface is used to clamp and limit the locked object. When the excitation pressure rod is slid to align the excitation groove with the limiting plate, squeezing the clamping surface can cause the limiting plate to rotate in the triggering direction and be inserted into the excitation groove to disengage the limiting plate from the locked object.

[0011] A soil strength tester comprises: a shell, a launching cavity is provided in the shell, a launching block is slidably connected in the launching cavity, the launching block is connected to the inner wall of the shell through an elastic member, and a compression groove is provided in the shell along the length direction; a pull bolt is connected to the launching block, one end of the pull bolt away from the launching block passes through the compression groove and slidably cooperates with the compression groove, the pull bolt is used to compress the elastic member so that the launching block can be launched along the launching cavity; a probe nail is detachably connected to the launching block, and the probe nail is used to penetrate into the test piece. Soil; any one of the above-mentioned excitation locking mechanisms, wherein the external environment is the shell, the locked object is the ejection block, the limiting plate is used to engage with the end face of the ejection block to lock the ejection block, when the ejection block is locked, the elastic member is in a compressed state, when the excitation pressure rod is slid to align the excitation groove with the limiting plate, the ejection block squeezes the limiting plate to rotate the limiting plate in the triggering direction and insert into the excitation groove, the limiting plate disengages from the ejection block, and the ejection block is ejected along the ejection cavity.

[0012] Optionally, the housing includes a mounting box which is detachably connected to the housing. The mounting box includes two half-boxes detachably connected to each other. The mounting cylinder is connected to the inner wall of the half-box, the rotating shaft is connected to the inner wall of the half-box, one end of the excitation lever away from the mounting cylinder penetrates through the box wall of the half-box and is slidably engaged with the half-box, and the limiting piece penetrates through the box wall of the mounting box and the side wall of the housing and cooperates with the ejection block.

[0013] Optionally, the root of the probe nail penetrates through the ejection block, and a bearing plate is coaxially sleeved on the probe nail. The bearing plate abuts against one end of the ejection block away from the elastic member.

[0014] Optionally, a end cover is detachably connected to one end of the housing away from the probe nail. The end cover is used to close the ejection cavity.

[0015] Optionally, a handle is connected to one end of the bolt away from the ejection block.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] An excitation locking mechanism provided by the present invention, by setting a mounting cylinder and an excitation lever, uses the mounting cylinder to provide a support point and a sliding base for the excitation lever, so that the excitation lever can slide along its axis; on this basis, by setting a limiting piece, which is axially hinged through a rotating shaft, so that it can rotate, and a return torsion spring is set to position its initial position and reset its rotation action; on this basis, when the limiting piece is in the initial position, it abuts against the excitation lever, and the excitation lever is used to limit it so that it cannot rotate in the triggering direction. The object to be locked is locked by the limiting piece in this state, so that the object to be locked stores elastic potential energy. Since the limiting piece cannot rotate in the triggering direction, it always blocks the object to be locked; on this basis, an excitation groove is opened on the side wall of the excitation lever and is arranged in a staggered manner with the limiting piece. When unlocking is required, the excitation lever is controlled to slide along the axis so that the excitation groove is aligned with the limiting piece. At this time, the elastic potential energy stored by the object to be locked is converted into kinetic energy, squeezing the limiting piece and pressing the limiting piece into the excitation groove, so that the limiting piece loses the locking effect on the object to be locked, and the object to be locked is ejected.

[0018] A soil strength detector provided by the present invention includes a housing with an ejection cavity formed therein. An ejection block is slidably disposed in the ejection cavity and is connected to the inner wall of the housing through an elastic member. On this basis, a pull bolt is provided, and the elastic member is compressed by pulling the ejection block with the pull bolt to store elastic potential energy in the elastic member. After the pull bolt is released, the elastic potential energy of the elastic member is converted into the kinetic energy of the ejection block, causing the ejection block to eject along the ejection cavity. On this basis, a probe nail is connected to the ejection block, and the ejected ejection block drives the probe nail to move quickly, enabling the probe nail to penetrate into the soil to be detected. Then, the strength of the soil to be detected can be calculated based on the penetration depth of the probe nail. By providing the above-mentioned excitation locking mechanism, the ejection block is locked by a limiting piece, and when locked, the elastic member is in a compressed state, and in this state, the pulling force of the hand on the pull bolt can be removed. When ejection is required, pressing the excitation lever aligns the excitation groove with the limiting piece; the detector has a simple structure, a small volume, and can directly act on the soil to be detected, effectively solving the problems of existing detection instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0020] Figure 1 is a front view of the excitation locking mechanism provided by the present invention;

[0021] Figure 2 is a top view of the excitation locking mechanism provided by the present invention;

[0022] Figure 3 is a side sectional view of the soil strength detector provided by the present invention in a compressed state;

[0023] Figure 4 is a side sectional view of the soil strength detector provided by the present invention in an ejection state.

[0024] Reference numerals in the drawings and corresponding component names:

[0025] 10 - mounting cylinder; 11 - excitation lever; 111 - excitation groove; 112 - limiting portion; 12 - return spring; 20 - limiting piece; 201 - extrusion surface; 202 - clamping surface; 21 - rotating shaft; 22 - return torsion spring; 30 - housing; 301 - compression groove; 31 - ejection cavity; 32 - ejection block; 33 - elastic member; 34 - pull bolt; 341 - handle; 35 - probe nail; 351 - bearing plate; 40 - mounting box; 41 - half box; 42 - end cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0027] Please refer to Figure 1 and Figure 2 The embodiment of the present invention provides an excitation locking mechanism, comprising: an installation tube 10, one end of which is connected to the external environment, and the other end is slidably sleeved with an excitation pressure rod 11, and the side wall of the excitation pressure rod 11 is provided with an excitation groove 111; the second includes a limiting plate 20, the limiting plate 20 is hinged with the external environment through a rotating shaft 21, the rotating shaft 21 is arranged parallel to the excitation pressure rod 11, and the rotating shaft 21 is sleeved with a reset torsion spring 22, one end of the reset torsion spring 22 is connected to the limiting plate 20, and the other end is connected to the external environment, when the reset torsion spring 22 is in a natural state, the limiting plate 20 abuts against the excitation pressure rod 11, so that the limiting plate 20 cannot rotate in the triggering direction; when the excitation pressure rod 11 is slid to align the excitation groove 111 with the limiting plate 20, the limiting plate 20 can be inserted into the excitation groove 111 under the action of external force, so that the limiting plate 20 can rotate in the triggering direction.

[0028] By setting the mounting tube 10 and the excitation pressure rod 11, the mounting tube 10 is used to provide a support point and a sliding basis for the excitation pressure rod 11, so that the excitation pressure rod 11 can slide along its axial direction; on this basis, by setting the limiting plate 20, it is hinged with the external environment through the rotating shaft 21, so that it can rotate with the rotating shaft 21 as the axis, and a reset torsion spring 22 is set to locate the initial position of the limiting plate 20 and reset its rotation action; on this basis, by setting the limiting plate 20 to abut against the excitation pressure rod 11 when it is in the initial position, the excitation pressure rod 11 is used to limit it so that it cannot rotate in the triggering direction, and the limiting plate 20 in this state is used to prevent the triggering pressure rod from rotating in the triggering direction. The plate 20 locks the locked object, allowing the locked object to maintain the accumulation of elastic potential energy. Since the limiting plate 20 cannot rotate in the triggering direction, it always blocks the locked object. On this basis, an excitation groove 111 is opened on the side wall of the excitation pressure rod 11, and the excitation groove 111 and the limiting plate 20 are staggered. When the lock needs to be released, the excitation pressure rod 11 is controlled to slide axially to align the excitation groove 111 with the limiting plate 20. At this time, the elastic potential energy accumulated in the locked object is converted into kinetic energy, squeezing the limiting plate 20, pressing the limiting plate 20 into the excitation groove 111, so that the limiting plate 20 loses its locking effect on the locked object, and the locked object can be ejected smoothly.

[0029] It should be noted that the above-mentioned external environment refers to the device or tool equipped with this excitation locking mechanism. It only needs to fix this excitation locking mechanism to the device or tool by using the mounting cylinder 10 and the rotating shaft 21, and make the limiting piece 20 be able to perform clamping and limiting on the object to be locked (the object bearing kinetic energy).

[0030] It should be noted that the above-mentioned object to be locked refers to the object that bears the kinetic energy converted from elastic potential energy. Limiting and locking the object to be locked to keep it stationary at a certain working position can accumulate elastic potential energy. When the limiting and locking applied to it is removed, the elastic potential energy it has will be converted into its own kinetic energy, causing it to eject.

[0031] It should be noted that after the object to be locked ejects, it is completely separated from the limiting piece 20, and the limiting piece 20 will reset to the initial state under the action of the reset torsion spring 22, that is, it pops out from the excitation groove 111 and abuts against the side wall of the excitation lever 11. At this time, just slide the excitation lever 11 to misalign the excitation groove 111 and the limiting piece 20, and the limiting piece 20 can be restricted from rotating in the triggering direction again.

[0032] It should be noted that the triggering direction is one of the two directions in which the limiting piece 20 can rotate along the rotating shaft 21, and it is a direction defined for the convenience of expression. Specifically, whether it rotates clockwise or counterclockwise can be set correspondingly according to the actual situation.

[0033] It should be noted that the excitation lever 11 can align the excitation groove 111 with the limiting piece 20 by pressing or by pulling outward. In this embodiment, the pressing method is adopted, and the pulling outward method can be adopted in other embodiments, which will not be repeated later.

[0034] In order to realize the automatic reset of the excitation lever 11, a reset spring 12 is provided between the excitation lever 11 and the mounting cylinder 10. The relative sliding of the excitation lever 11 and the mounting cylinder 10 can compress or stretch the reset spring 12. When the reset spring 12 is in the natural state, the limiting piece 20 and the excitation groove 111 are misaligned.

[0035] By setting the reset spring 12, the excitation lever 11 will surely reset under the action of the reset spring 12 after moving axially. For example, when implementing excitation, press the excitation lever 11 to align the excitation groove 111 with the limiting piece 20, and the object to be locked will press the limiting piece 20 into the excitation groove 111. After the object to be locked ejects, the reset torsion spring 22 drives the limiting piece 20 to rotate back and reset, and the limiting piece 20 is separated from the excitation groove 111. At this time, the reset spring 12 drives the excitation lever 11 to reset, and the whole device returns to the initial state.

[0036] To further explain the installation structure of the return spring 12, the excitation lever 11 is provided with a limiting portion 112. The diameter of the limiting portion 112 is larger than that of the excitation lever 11. The return spring 12 is arranged between the limiting portion 112 and the installation cylinder 10. One end of the return spring 12 abuts against the end face of the limiting portion 112, and the other end abuts against the end face of the installation cylinder 10. The excitation groove 111 is formed in the limiting portion 112.

[0037] By providing the limiting portion 112 with a diameter larger than that of the excitation lever 11, on the one hand, the return spring 12 is clamped between the limiting portion 112 and the installation cylinder 10 to prevent the return spring 12 from falling off. On the other hand, when the entire excitation locking mechanism is installed in a housing or a box body, a through hole matching the diameter of the excitation lever 11 is opened so that the pressing end of the excitation lever 11 extends out. At this time, the limiting portion 112 cannot extend out of the through hole, so that the limit can be implemented to prevent the excitation lever 11 from falling off from the box body or the housing. Thirdly, the large diameter of the limiting portion 112 can improve the structural strength of this part. By forming the excitation groove 111 in the limiting portion 112, the structural strength of this part can be effectively utilized to prevent unnecessary fracture of the excitation lever 11 during use.

[0038] To further explain the specific structure of the limiting piece 20, the limiting piece 20 is strip-shaped. The rotating shaft 21 is arranged in the middle of the limiting piece 20. The contact point between the excitation lever 11 and the limiting piece 20 is one end of the limiting piece 20, so that the limiting piece 20 can only rotate in the direction opposite to the triggering direction.

[0039] Through the above settings, it is certain that the limiting piece 20 cannot rotate in the triggering direction under the limitation of the excitation lever 11. However, since the excitation lever 11 only limits one end of the limiting piece 20, and the limiting piece 20 is strip-shaped and the excitation lever 11 is also a thin rod, it does not limit the rotation of the limiting piece 20 in the opposite direction, that is, in the direction opposite to the triggering direction. Utilizing this structural characteristic, the object to be locked can be set to move linearly. When it moves in the direction of accumulating elastic potential energy and contacts and presses the limiting piece 20, the limiting piece 20 rotates in the direction opposite to the triggering direction, and does not limit and lock the object to be locked. The object to be locked smoothly passes over the limiting piece 20, and then the limiting piece 20 resets under the action of the return torsion spring 22. At this time, the external force applied to the object to be locked is removed, and the elastic potential energy accumulated by the object to be locked is converted into kinetic energy, so that it ejects in the opposite direction. At this time, the object to be locked contacts the object to be locked again. At this time, the object to be locked cannot rotate in the triggering direction, so that the object to be locked is clamped, limited and locked.

[0040] In order to further explain the specific structure of the limiting piece 20, the limiting piece 20 is a trapezoidal piece, so that the limiting piece 20 forms an extrusion surface 201 at at least one oblique side, and extruding the extrusion surface 201 can make the limiting piece 20 rotate in the direction opposite to the triggering direction; the limiting piece 20 forms a clamping surface 202 at the bottom, and the clamping surface 202 is used to clamp and limit with the locked object. When the excitation pressure rod 11 is slid to align the excitation groove 111 with the limiting piece 20, squeezing the clamping surface 202 can make the limiting piece 20 rotate in the triggering direction and insert into the excitation groove 111 to make the limiting piece 20 disengage from the locked object.

[0041] By setting it as a trapezoidal piece, its length direction is the direction of the straight line where the upper base and the lower base are located, and its extrusion surface 201 is the side that is first extruded and contacted with the locked object in the above process. By setting it as an inclined surface, the surface contact between the locked object and the limiting plate 20 can be converted into line contact, making the extrusion process smoother, and the clamping surface 202 is the side that is contacted for the second time in the above process.

[0042] It should be noted in advance that in the field of geotechnical engineering, soil is an unfavorable rock mass in engineering construction, and targeted engineering treatment measures are required. The selection of targeted engineering treatment measures is based on the strength parameters of the soil, so it is very important to obtain the strength parameters of the soil. The existing methods for determining soil strength mainly use geotechnical mechanics tests, but geotechnical mechanics tests not only have complex operating procedures, high costs, long test cycles, and can only select typical samples for testing, but the testing instruments used also generally have complex structures, large volumes, and difficult transportation.

[0043] Please refer to Figure 3 and Figure 4, To solve the above problems, an embodiment of the present invention further provides a soil strength detector, including: a housing 30, an ejection chamber 31 is opened in the housing 30, an ejection block 32 is slidably connected in the ejection chamber 31, the ejection block 32 is connected to the inner wall of the housing 30 through an elastic member 33, and the housing 30 is provided with a compression groove 301 along the length direction; Secondly, a pull bolt 34 is included, the pull bolt 34 is connected to the ejection block 32, one end of the pull bolt 34 away from the ejection block 32 penetrates through the compression groove 301 and is slidably matched with the compression groove 301, and the pull bolt 34 is used to compress the elastic member 33 so that the ejection block 32 can be ejected along the ejection chamber 31; Thirdly, a probe nail 35 is included, the probe nail 35 is detachably connected to the ejection block 32, and the probe nail 35 is used to penetrate into the soil to be measured; Fourthly, the above-mentioned excitation locking mechanism is included, the external environment is the housing 30, the object to be locked is the ejection block 32, and the limiting piece 20 is used to be clamped with the end face of the ejection block 32 to lock the ejection block 32. When the ejection block 32 is locked, the elastic member 33 is in a compressed state. When the excitation lever 11 is slid so that the excitation groove 111 is aligned with the limiting piece 20, the ejection block 32 presses the limiting piece 20, causing the limiting piece 20 to rotate in the trigger direction and insert into the excitation groove 111. The limiting piece 20 is disengaged from the ejection block 32, and the ejection block 32 is ejected along the ejection chamber 31.

[0044] By providing the housing 30, an ejection chamber 31 is opened in the housing 30, an ejection block 32 is slidably arranged in the ejection chamber 31, and the ejection block 32 is connected to the inner wall of the housing 30 through an elastic member 33. On this basis, by providing a pull bolt 34, the elastic member 33 is compressed by pulling the ejection block 32 with the pull bolt 34 to store elastic potential energy for the elastic member 33. After the pull bolt 34 is released, the elastic potential energy of the elastic member 33 is converted into the kinetic energy of the ejection block 32, so that the ejection block 32 is ejected along the ejection chamber 31. On this basis, a probe nail 35 is connected to the ejection block 32, and the ejected ejection block 32 drives the probe nail 35 to move quickly, so that the probe nail 35 penetrates into the soil to be detected. Then, the strength of the soil to be measured can be calculated according to the penetration depth of the probe nail 35. By providing the above-mentioned excitation locking mechanism, the ejection block 32 is locked by using the limiting piece 20, and when locked, the elastic member 33 is in a compressed state. In this state, the pulling of the hand on the pull bolt 34 can be removed. When ejection is required, press the excitation lever 11 so that the excitation groove 111 is aligned with the limiting piece 20; this detector has a simple structure, is small in size, and can directly act on the soil to be measured, effectively solving the problems of existing detection instruments.

[0045] For the installation and protection of the excitation locking mechanism, the housing 30 includes an installation box 40. The installation box 40 is detachably connected to the housing 30. The installation box 40 includes two detachably connected half-boxes 41. The installation cylinder 10 is connected to the inner wall of the half-box 41. The rotating shaft 21 is connected to the inner wall of the half-box 41. One end of the excitation pressure rod 11 away from the installation cylinder 10 penetrates through the box wall of the half-box 41 and is slidably matched with the half-box 41. The limiting piece 20 penetrates through the box wall of the installation box 40 and the side wall of the housing 10 and cooperates with the ejection block 32.

[0046] To further explain the specific structure of the probe nail 35, the root of the probe nail 35 penetrates through the ejection block 32. The probe nail 35 is coaxially sleeved with a bearing plate 351. The bearing plate 351 abuts against one end of the ejection block 32 away from the elastic member 33.

[0047] By arranging the probe nail 35 to be inserted into the ejection block 32, the two can be quickly loaded and unloaded. By arranging the bearing plate 351, the contact area between the probe nail 35 and the ejection block 32 is increased, thereby reducing the pressure between the two and preventing the reaction force during the penetration of the probe nail 35 from causing the head of the probe nail 35 to penetrate reversely into the ejection block 32.

[0048] To facilitate the loading and unloading of the ejection block 32, an end cover 42 is detachably connected to one end of the housing 30 away from the probe nail 35. The end cover 42 is used to close the ejection cavity 31.

[0049] To facilitate the pulling of the bolt 34, a handle 341 is connected to one end of the bolt 34 away from the ejection block 32. The size of the handle 341 is larger than that of the bolt 34, and it is detachably connected to the bolt 34, thereby facilitating the loading and unloading between the bolt 34 and the compression groove 301.

[0050] The above specific implementation manners have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soil strength detector, characterized in that, Comprising: A housing, within which an ejection chamber is formed. An ejection block is slidably connected within the ejection chamber. The ejection block is connected to the inner wall of the housing through an elastic member. The housing is provided with a compression groove along its length direction. A bolt, which is connected to the ejection block. One end of the bolt away from the ejection block penetrates through the compression groove and is slidably engaged with the compression groove. The bolt is used to compress the elastic member so that the ejection block can be ejected along the ejection chamber. A probe nail, which is detachably connected to the ejection block. The probe nail is used to penetrate into the soil to be measured. An excitation locking mechanism, comprising: An installation cylinder, one end of which is connected to the housing, and the other end is slidably sleeved with an excitation pressure rod. An excitation groove is formed on the side wall of the excitation pressure rod. A limiting piece, which is axially hinged to the housing through a rotating shaft. The rotating shaft is arranged parallel to the excitation pressure rod. A return torsion spring is sleeved on the rotating shaft. One end of the return torsion spring is connected to the limiting piece, and the other end is connected to the housing. When the return torsion spring is in its natural state, the limiting piece abuts against the excitation pressure rod so that the limiting piece cannot rotate in the triggering direction. When the excitation pressure rod is slid so that the excitation groove is aligned with the limiting piece, the limiting piece can be inserted into the excitation groove under an external force so that the limiting piece can rotate in the triggering direction. A return spring is provided between the excitation pressure rod and the installation cylinder. The relative sliding of the excitation pressure rod and the installation cylinder can compress or stretch the return spring. When the return spring is in its natural state, the limiting piece is misaligned with the excitation groove. The excitation pressure rod is provided with a limiting portion, the diameter of which is larger than that of the excitation pressure rod. The return spring is arranged between the limiting portion and the installation cylinder. One end of the return spring abuts against the end face of the limiting portion, and the other end abuts against the end face of the installation cylinder. The excitation groove is formed on the limiting portion. The limiting piece is trapezoidal in shape, so that at least one beveled side of the limiting piece forms a pressing surface. Pressing the pressing surface can make the limiting piece rotate in a direction opposite to the triggering direction. A clamping surface is formed at the lower base of the limiting piece. The clamping surface is used for clamping and limiting the ejection block. When the excitation pressure rod is slid so that the excitation groove is aligned with the limiting piece, pressing the clamping surface can make the limiting piece rotate in the triggering direction and insert into the excitation groove so that the limiting piece is disengaged from the ejection block. The limiting piece is used for clamping with the end face of the ejection block to lock the ejection block. When the ejection block is locked, the elastic member is in a compressed state. When the excitation pressure rod is slid so that the excitation groove is aligned with the limiting piece, the ejection block presses the limiting piece so that the limiting piece rotates in the triggering direction and inserts into the excitation groove. The limiting piece is disengaged from the ejection block, and the ejection block is ejected along the ejection chamber.

2. The soil strength detector according to claim 1, characterized in that, The housing includes a mounting box, the mounting box is detachably connected to the housing, the mounting box includes two half-boxes detachably connected to each other, the mounting cylinder is connected to the inner wall of the half-box, the rotating shaft is connected to the inner wall of the half-box, one end of the excitation lever away from the mounting cylinder penetrates through the box wall of the half-box and is slidably matched with the half-box, and the limiting piece penetrates through the box wall of the mounting box and the side wall of the housing and cooperates with the ejection block.

3. The soil strength detector according to claim 1, wherein The root of the probe nail penetrates through the ejection block, a bearing plate is coaxially sleeved on the probe nail, and the bearing plate abuts against one end of the ejection block away from the elastic member.

4. The soil strength detector according to claim 1, characterized in that, One end of the housing away from the probe nail is detachably connected with an end cover, and the end cover is used for closing the ejection cavity.

5. The soil strength detector according to claim 1, wherein, One end of the bolt away from the ejection block is connected with a handle.

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