CN113863969B

CN113863969B - Support column with self-locking structure

Info

Publication number: CN113863969B
Application number: CN202111183811.6A
Authority: CN
Inventors: 王梁; 王海军; 王洪磊; 赵建; 刘少权; 曹云; 孟建新; 杨晓辉; 刘凡; 王振; 杜学飞; 赵嘉宇
Original assignee: General Coal Research Institute Co Ltd
Current assignee: General Coal Research Institute Co Ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-09-06
Anticipated expiration: 2041-10-11
Also published as: CN113863969A

Abstract

The invention relates to the technical field of roadway support and discloses a support column with a self-locking structure, which comprises an upper support leg, a lower support leg and a locking assembly, wherein the upper support leg is connected with the lower support leg through a bolt; a ratchet bar is arranged on the inner wall surface of the upper supporting leg; the lower leg is slidably fitted in the upper leg along the length direction of the upper leg; the locking assembly is coupled to the lower leg and includes a pawl rotatable between an open position in which the pawl engages the ratchet bar to lock the upper leg and the lower leg and a closed position in which the pawl is disengaged from the ratchet bar. The oil-liquid leakage-proof device is ingenious in structural design, light in weight, easy to carry, simpler in installation, disassembly and assembly processes and capable of effectively avoiding environmental pollution caused by oil liquid leakage.

Description

Support column with self-locking structure

Technical Field

The invention relates to the technical field of roadway support, in particular to a support column with a self-locking structure.

Background

Most of the existing roadway supporting and protecting devices adopt hydraulic oil cylinders for supporting, and a supporting pump station is required in the supporting and protecting mode, so that the size is large. And the existing hydraulic cylinder supporting and protecting device basically needs manual work to connect the liquid injection and liquid outlet pipelines in the mounting and dismounting processes, so that the operation is very complicated, and the carrying and mounting are difficult.

In addition, no matter the existing oil cylinder type supporting and supporting device uses hydraulic oil or emulsion, the leakage and seepage faults of the supporting and supporting device frequently occur due to the problems of large matched pump station, complex loop and pipeline, multiple control systems and the like of the supporting and supporting device; and need frequently carry out pipe connection and pull in its installation and dismouting in-process, the inevitable a large amount of leakages that produce of liquid in the pipeline at this in-process to cause very big pollution to mine underground environment, especially cause irreparable pollution to the river system of near region, and then seriously influence the drinking water safety of masses and the descendants of the future, urgent need to solve.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems: the existing roadway supporting device is large in size, very complex in operation in the installation and disassembly processes, difficult in carrying and installation, and extremely large in pollution to the underground environment of a mine due to inevitable leakage of liquid in pipelines in the installation and disassembly processes.

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

To this end, an embodiment of the present invention provides a support column with a self-locking structure, where the support column according to the embodiment of the present invention includes an upper leg, a lower leg, and a locking assembly; a ratchet bar is arranged on the inner wall surface of the upper supporting leg and is detachably connected with the upper supporting leg; the lower leg is slidably fitted in the upper leg along the length direction of the upper leg; said locking assembly connected to said lower leg, said locking assembly including a pawl rotatable between an open position wherein said pawl engages said ratchet bar to lock said upper leg and said lower leg and a closed position wherein said pawl is disengaged from said ratchet bar, said locking assembly further including a housing, a connecting rod and an operating lever; the shell is connected with the upper end of the lower supporting leg, at least part of the pawl is positioned in the shell, and the pawl is rotatably pivoted with the shell; the connecting rod is positioned in the shell, and one end of the connecting rod is connected with the tail end of the pawl; one end of the operating rod is positioned in the shell and is connected with the other end of the connecting rod, and the operating rod can slide along the length direction of the shell to drive the ratchet bar to rotate between the opening position and the closing position.

Compared with the existing oil cylinder type supporting and protecting device, the invention has the following advantages:

1. the support column provided by the invention can replace the traditional oil cylinder type support column, does not need to adopt a hydraulic oil cylinder for supporting, and avoids environmental pollution caused by oil leakage.

2. The supporting column provided by the invention is simpler in mounting and dismounting process, is easy to realize automation, light in weight and easy to carry compared with a hydraulic cylinder supporting column without a manual connecting pipeline and an auxiliary pump station, and can not cause the supporting timeliness caused by leakage of the hydraulic cylinder supporting column when the supporting column is in a long-time supporting state, thereby improving the supporting safety.

In some embodiments, the ratchet bar, the pawl and the connecting rod are in one-to-one correspondence, the two ratchet bars are oppositely arranged on the inner wall surface of the upper supporting leg, and in the opening position, tail portions of the two pawls are pressed against each other.

In some embodiments, the locking assembly further includes a stop member and a first return spring, the other end of the operating rod is located outside the housing and connected to the stop member, the first return spring is sleeved outside the operating rod, one end of the first return spring abuts against an outer wall surface of the housing, and the other end of the first return spring abuts against the stop member.

In some embodiments, the locking assembly further includes a locking pin connected to the operating lever and penetrating through the housing in a thickness direction of the housing, the locking pin is slidable in the thickness direction of the housing, a first through hole is formed at a lower end of the upper leg, and the locking pin is adapted to fit in the first through hole to relatively fix the upper leg and the lower leg.

In some embodiments, the lock pin is provided with a second through hole opened along a radial direction thereof, the operating lever penetrates through the second through hole, and a dimension of the second through hole in a length direction of the lock pin is larger than a dimension of the operating lever in the length direction of the lock pin.

In some embodiments, the locking assembly further includes a locking pin guide rod, a sliding groove is formed in a side wall of the operating rod along the length direction of the operating rod, the locking pin guide rod is connected to the locking pin, and one end of the locking pin guide rod is slidably fitted in the sliding groove.

In some embodiments, the locking assembly further includes a second return spring, the second return spring is sleeved outside the locking pin, an annular protrusion is disposed on the periphery of the locking pin, one end of the second return spring abuts against the annular protrusion, and the other end of the second return spring abuts against the inner wall of the housing.

In some embodiments, the support column further includes a tensioning assembly, the tensioning assembly includes a tensioning rod and a tensioning spring, one end of the tensioning rod is connected to the housing, the other end of the tensioning rod is connected to the upper end of the lower support leg, the tensioning spring is sleeved outside the tensioning rod, one end of the tensioning spring abuts against the housing, and the other end of the tensioning spring abuts against the lower support leg.

In some embodiments, the support column further comprises a foot connected to a lower end of the lower leg.

Drawings

Fig. 1 is a front view of the present invention in a contracted state.

Fig. 2 is a right side view of the invention in a collapsed state.

Fig. 3 is a rear view of the present invention in a collapsed state.

Fig. 4 is a sectional view taken along line a-a of fig. 1.

Fig. 5 is a sectional view taken along line B-B in fig. 1.

Fig. 6 is a sectional view taken along line C-C of fig. 1.

Fig. 7 is a partial enlarged view at D in fig. 5.

Fig. 8 is a sectional view taken along line E-E of fig. 2.

Fig. 9 is a partial enlarged view at F in fig. 8.

Fig. 10 is a schematic view of the locking pin of the present invention assembled with the locking pin guide bar.

FIG. 11 is a block diagram of the invention after deployment.

Reference numerals: 5. an upper support leg; 501. a first through hole; 6. a lower leg; 9. a ratchet bar; 10. a second return spring; 11. a pawl; 12. a housing; 13. a joystick; 1301. a chute; 14. a connecting rod; 15. a pin shaft; 16. a stopper; 17. a first return spring; 18. a locking pin; 1801. a second through hole; 19. a locking pin guide lever; 20. a tension rod; 21. tensioning the spring; 22. footing; 53. an inner supporting hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1 to 11, the present invention provides a support post having a self-locking structure, which includes an upper leg 5, a lower leg 6 and a locking assembly. The inner part of the upper supporting leg 5 is of a hollow structure, namely, a cavity for accommodating the lower supporting leg 6 is formed in the upper supporting leg 5, and a ratchet bar 9 is arranged on the inner wall surface of the upper supporting leg 5; as a preferred embodiment, the ratchet bar 9 may be integrally formed with the upper leg 5. In addition, the ratchet bar 9 can be detachably connected with the upper leg 5, for example, the ratchet bar 9 can also be fixed with the inner wall of the upper leg 5 by a connector such as a bolt. The lower leg 6 is slidably fitted in the upper leg 5 in the length direction of the upper leg 5, and the lower leg 6 is insertedly fitted in a cavity of the upper leg 5 at the time of assembly. The inner side surfaces of the upper supporting leg 5 and the lower supporting leg 6 are respectively provided with a circular inner supporting hole 53.

The locking assembly is connected to the lower leg 6 and comprises a pawl 11, the pawl 11 being rotatable between an open position and a closed position. In the open position, the pawl 11 engages with the ratchet 9 to lock the upper leg 5 and the lower leg 6, and the upper leg 5 and the lower leg 6 cannot slide relative to each other; in the closed position, the pawl 11 is separated from the ratchet bar 9, and the upper support leg 5 and the lower support leg 6 can slide relatively to each other, so that the telescopic adjustment of the support column is realized.

According to the support column provided by the embodiment of the invention, the controllable extension and contraction between the upper support leg 5 and the lower support leg 6 are realized in a mode that the pawl 11 is matched with the ratchet bar 9, and a stable support effect can be achieved. The support column provided by the invention can replace the traditional oil cylinder type support column, does not need to adopt a hydraulic oil cylinder for supporting, and avoids environmental pollution caused by oil leakage. Moreover, the mounting, dismounting and mounting process of the support column is simpler, compared with a support column of a hydraulic oil cylinder type, the support column does not need a manual connecting pipeline, does not need an auxiliary pump station, is easy to realize automation, and has the advantages of light weight and easy carrying. In addition, when the support column is in a long-time support state, the support column does not have the support aging caused by leakage of hydraulic oil cylinder support columns, and therefore the support safety is improved.

The latch assembly further comprises a housing 12, an operating lever 13 and a connecting rod 14. The housing 12 is also disposed within the cavity of the upper leg 5 and one end of the housing 12 is connected to the upper end of the lower leg 6, the housing 12 moving synchronously with the lower leg 6 as the lower leg 6 slides within the upper leg 5. One end of the operating lever 13 is located in the housing 12 and connected to the rear end of the connecting rod 14, and the operating lever 13 is slidable along the length of the housing 12 (which is the same as the length of the lower leg 6) to rotate the pawl 11 between the open position and the closed position.

In specific implementation, a through hole for passing the operating lever 13 is formed in the top center of the housing 12, and the operating lever 13 is inserted into the through hole in the housing 12 and can slide in the through hole along the length direction of the lower leg 6. The cross-sectional shape of the operating lever 13 is designed to be non-circular (e.g., rectangular), and the shape of the through-hole of the housing 12 for passing the operating lever 13 therethrough is matched to the cross-sectional shape of the operating lever 13, thereby preventing the operating lever 13 from rotating about its axis. The connecting rod 14 is positioned in the shell 12, one end of the connecting rod 14 is hinged with the rod body of the operating rod 13, and the other end of the connecting rod 14 is hinged with the tail end of the pawl 11. Said pawl 11 is at least partially located within the housing 12, the end of the pawl 11 remote from the connecting rod 14 being adapted to engage with the ratchet bar 9. The pawl 11 is pivotally connected to the housing 12 in a rotatable manner, in a specific implementation, a pin hole penetrating through two side surfaces of the pawl 11 may be formed in the pawl 11, a pin 15 is inserted into the through hole in the pawl 11, and two ends of the pin 15 are fixed to the housing 12, and the pawl 11 may rotate around the pin 15 under the pulling action of the connecting rod 14, thereby achieving engagement and separation between one end of the pawl 11 away from the connecting rod 14 and the ratchet bar 9.

In some embodiments, the ratchet bars 9, the pawls 11 and the connecting rods 14 are two and correspond to each other, the two ratchet bars 9 are oppositely arranged on the inner wall surface of the upper leg 5, in the open position, the tail portions of the two pawls 11 are pressed against each other, and the two ratchet bars 9, the two pawls 11 and the two connecting rods 14 are symmetrically distributed on two sides of the operating rod 13. The two pawls 11 are connected with the operating rod 13 through the two connecting rods 14, so that the two pawls 11 are synchronously opened and closed, the two pawls 11 can be simultaneously in a locked or opened state through operating the operating rod 13, the two pawls 11 and the two ratchet bars 9 are simultaneously stressed when the support column works, and the whole structure can play a balance role in the stress of the two pawls 11 and the stress of the two ratchet bars 9, so that the strength requirements of the pawls 11 and the ratchet bars 9 are reduced, and the support stability and the support safety of the support column are improved.

Referring to fig. 8 and 9, the locking assembly further includes a stopper 16 and a first return spring 17, and one end of the operating rod 13 extends to the outside of the housing 12 and is fixedly connected to the stopper 16. The first return spring 17 is a compression spring, the first return spring 17 is sleeved outside the operating lever 13 between the stop member 16 and the housing 12, one end of the first return spring 17 abuts against the outer wall surface of the housing 12, and the other end of the first return spring abuts against the stop member 16.

When in use, the operating rod 13 can be operated to move up and down through the stop piece 16, so that the pawl 11 is meshed with and separated from the ratchet bar 9, and the specific principle is as follows: the operating rod 13 moves downwards by pressing the stop piece 16, the first return spring 17 is compressed, the connecting rod 14 connected with the bottom of the operating rod 13 pushes the pawl 11 to rotate, one end of the pawl 11 close to the ratchet rack 9 rotates towards the operating rod 13, meanwhile, because the shell 12 and the lower leg 6 have the tendency of moving downwards, the separation of the pawl 11 and the ratchet rack 9 can be easily realized, and finally, the pawl 11 moves to the closed position, at the moment, the upper leg 5 and the lower leg 6 can slide relatively, and the extension or the shortening of the support column can be realized; after the supporting column is lengthened or shortened to a required length, the pressing force applied to the stop piece 16 is removed, then under the elastic force of the first return spring 17, the operating rod 13 slides upwards, the connecting rod 14 connected to the bottom of the operating rod 13 drives the pawl 11 to rotate, and finally, one end of the pawl 11 far away from the connecting rod 14 is clamped between teeth of the ratchet bar 9, and simultaneously, one ends of the two pawls 11 are contacted with each other, so that the upper leg 5 and the lower leg 6 are locked with each other, and the supporting column cannot stretch and retract.

Referring to fig. 6 and 7, the locking assembly further includes a locking pin 18, the locking pin 18 is connected to the operating lever 13 and penetrates the housing 12 along a thickness direction (left and right directions indicated by an arrow G in fig. 6) of the housing 12, the locking pin 18 is slidable along the thickness direction of the housing 12, the upper end of the upper leg 5 is provided with a first through hole 501, and the locking pin 18 is adapted to be fitted in the first through hole 501 to relatively fix the lower leg 6 of the upper leg 5. The lock pin 18 is provided with a second through hole 1801 formed along a radial direction thereof, the operating lever 13 penetrates through the second through hole 1801, and in order to ensure that the lock pin 18 can slide along a thickness direction of the housing 12, a dimension of the second through hole 1801 in a length direction of the lock pin 18 is larger than a dimension of the operating lever 13 in the length direction of the lock pin 18 (the same as a left-right direction indicated by an arrow G in fig. 6).

The locking assembly further comprises a locking pin guide rod 19, a sliding groove 1301 is formed in the side wall of the operating rod 13 in the length direction of the operating rod, the locking pin guide rod 19 is fixedly connected with the locking pin 18, two opposite side faces of the locking pin 18 can be respectively provided with a guide rod mounting hole penetrating through the second through hole 1801 during specific assembly, and the two locking pin guide rods 19 are mounted in the corresponding guide rod mounting holes in an interference fit mode. One end of the locking pin guide rod 19 is slidably matched in the sliding groove 1301, an inclined surface inclined with the cross section of the operating rod 13 is arranged in the sliding groove 1301, when one end of the locking pin 18 is inserted into the first through hole 501 in the upper supporting leg 5, the operating rod 13 slides downwards by pressing the stop piece 16, the inclined surface in the sliding groove 1301 is in contact with the locking pin guide rod 19 in the process, the locking pin 18 moves towards the direction far away from the first through hole 501 under the interaction of the locking pin guide rod 19 and the inclined surface, the locking pin 18 gradually breaks away from the first through hole 501, and unlocking sliding of the locking pin 18 is achieved. The locking subassembly still includes second reset spring 10, second reset spring 10 cover is established in the outside of locking round pin 18, the week side of locking round pin 18 is equipped with the annular arch, the one end and the protruding counterbalance of annular of second reset spring 10 link to each other, the other end with the inner wall of casing 12 offsets. When the support column is contracted to the shortest state, the locking pin 18 automatically enters the first through hole 501 under the action of the elastic force of the second return spring 10, so that the upper and lower support legs 6 are in a locking state, and the support column is more convenient to use through the arranged second return spring 10.

Two pawls 11 in the locking assembly are arranged back to back, when the pawls 11 and the ratchet bars 9 in the locking assembly are in a locking state, the tails of the pawls 11 are mutually pressed, and the torque generated by the acting force of the ratchet bars 9 on the heads of the pawls 11 is mutually offset by the acting force and the reaction of the tails of the pawls 11 to form an internal force, so that the pawls 11 are prevented from generating positive pressure on the ratchet bars 9, the requirement of the upper supporting legs 5 on the structural strength is reduced, and the whole anti-loosening pre-tightening supporting column is light and simple.

The support column according to the embodiment of the invention is further provided with a tensioning assembly consisting of a tensioning rod 20 and a tensioning spring 21, one end of the tensioning rod 20 is connected with the shell 12, the other end of the tensioning rod is connected with the upper end of the lower leg 6, the tensioning spring 21 is sleeved on the outer side of the tensioning rod 20, one end of the tensioning spring 21 abuts against the shell 12, and the other end of the tensioning spring 21 abuts against the lower leg 6. When the supporting column works, the tensioning assembly can play a role in pre-tensioning and anti-loosening, and the stroke position of the supporting column has a certain buffering distance, so that the discrete locking characteristic of the pawl 11 and the ratchet bar 9 is adapted.

The supporting column according to the embodiment of the invention is further provided with the foot 22, the foot 22 is hinged with the lower end of the lower leg 6, when the supporting column is changed from the contraction state to the expansion state, the foot 22 can rotate to the state shown in fig. 11, the contact surface is increased through the foot 22, the contact surface is prevented from being crushed, and meanwhile, a better supporting effect is achieved.

The support column provided by the invention has the advantages of ingenious structural design, light weight and easiness in carrying, is favorable for saving energy in both a manufacturing link and a using link, and plays a role in reducing carbon emission. In addition, the support column provided by the invention can form various support devices by simple matching, and automatic support can be realized easily.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A support column with a self-locking structure, comprising:

the inner wall surface of the upper supporting leg is provided with a ratchet bar, and the ratchet bar is detachably connected with the upper supporting leg;

a lower leg slidably fitted within the upper leg along a length of the upper leg;

a locking assembly coupled to the lower leg, the locking assembly including a pawl rotatable between an open position and a closed position, in the open position, the pawl engages the ratchet bar to lock the upper leg and the lower leg, in the closed position, the pawl is disengaged from the ratchet bar, the locking assembly further includes a housing, a connecting rod, and an operating lever, the housing is connected to the upper end of the lower leg, at least a portion of the pawl is located within the housing, the pawl is pivoted with the shell in a rotatable way, the connecting rod is positioned in the shell, one end of the connecting rod is connected with the tail end of the pawl, one end of the operating rod is positioned in the shell and is connected with the other end of the connecting rod, and the operating rod can slide along the length direction of the shell to drive the pawl to rotate between the opening position and the closing position.

2. The self-locking support post according to claim 1, wherein the ratchet bars, the pawls and the connecting rods are all two and one-to-one corresponding to each other, the two ratchet bars are oppositely disposed on an inner wall surface of the upper leg, and in the open position, tail portions of the two pawls are pressed against each other.

3. The support post with the self-locking structure according to claim 2, wherein the locking assembly further comprises a stop member and a first return spring, the other end of the operating rod is located outside the housing and connected to the stop member, the first return spring is sleeved outside the operating rod, one end of the first return spring abuts against an outer wall surface of the housing, and the other end of the first return spring abuts against the stop member.

4. The self-locking supporting column according to claim 1, wherein the locking assembly further comprises a locking pin, the locking pin is connected to the operating rod and penetrates through the housing along a thickness direction of the housing, the locking pin is slidable along the thickness direction of the housing, a first through hole is formed in an upper end of the upper supporting leg, and the locking pin is adapted to fit in the first through hole so that the upper supporting leg and the lower supporting leg are relatively fixed.

5. The support post with the self-locking structure according to claim 4, wherein the locking pin is provided with a second through hole opened along a radial direction thereof, the operating lever penetrates through the second through hole, and a dimension of the second through hole in a length direction of the locking pin is larger than a dimension of the operating lever in the length direction of the locking pin.

6. The self-locking supporting column according to claim 5, wherein the locking assembly further comprises a locking pin guide rod, a sliding groove is formed in a side wall of the operating rod along a length direction of the operating rod, the locking pin guide rod is connected with the locking pin, and one end of the locking pin guide rod is slidably fitted in the sliding groove.

7. The support column with the self-locking structure according to claim 5, wherein the locking assembly further comprises a second return spring, the second return spring is sleeved outside the locking pin, an annular protrusion is disposed on the periphery of the locking pin, one end of the second return spring abuts against the annular protrusion, and the other end of the second return spring abuts against the inner wall of the housing.

8. The support post with the self-locking structure according to claim 1, further comprising a tension assembly, wherein the tension assembly comprises a tension rod and a tension spring, one end of the tension rod is connected with the housing, the other end of the tension rod is connected with the upper end of the lower leg, the tension spring is sleeved on the outer side of the tension rod, one end of the tension spring abuts against the housing, and the other end of the tension spring abuts against the lower leg.

9. A prop with self-locking mechanism according to any one of claims 1 to 8, further comprising a foot connected to the lower end of the lower leg.