Measurement gradienter capable of being folded and stored

Abstract

The invention relates to the technical field of gradienters, and particularly discloses a foldable storage measuring gradienter which comprises a gradienter body, three sets of supporting legs for supporting the gradienter body are arranged at the bottom end of the gradienter body, the lower end of the gradienter body is connected with a pull-up assembly for jacking up the gradienter body, and the pull-up assembly is stored below the gradienter body in a multi-stage telescopic mode. The lifting assembly comprises a base, a fourth telescopic ring is fixedly connected to the upper end of the base, and the first telescopic ring, the second telescopic ring, the third telescopic ring and the fourth telescopic ring are arranged on the base and matched with one another, so that when a user needs to increase the height of the gradienter, the gradienter is directly lifted by hand, the first telescopic ring slides upwards in the second telescopic ring, and the height of the gradienter is increased. After a sliding block on the surface of the first telescopic ring moves to the top end of a sliding groove in a second telescopic ring, the second telescopic ring is unlocked by extruding a plug pin, the second telescopic ring moves upwards under the action of pulling force, a third telescopic ring with the diameter gradually increased is gradually unlocked according to the pulling-up sequence, and the stability of the pulling-up assembly when the gradienter is lifted is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of level, in particular to a foldable storage measuring level. BACKGROUND

[0002] A laser level is a tool that uses laser technology for measurement. It determines the position of a horizontal plane by emitting a laser beam. Laser levels are widely used in construction, decoration, installation engineering and other fields. The core component of a laser level is a laser emitter, which can emit a highly concentrated laser beam. To ensure that the laser line remains in a truly horizontal or vertical position, a laser level is usually equipped with a precise tilt sensing system, such as an electronic tilt sensor or a bubble level. These systems can automatically adjust the laser emission angle to ensure that the laser line always remains horizontal or vertical.

[0003] The existing level is used for indoor decoration construction. When facing a reference target higher than the level, it can use a tilted laser to align with the target or use a tripod to level the level with the reference target. The first method is convenient and fast, but the reference target must be on the same horizontal plane. If it is not on the same horizontal plane, the laser will have an angle difference or even appear layered when it is irradiated. The height of the laser irradiated on the target will deviate, affecting the construction precision. In this case, the second method of using a tripod is used. The tripod has a minimum height of more than 500 mm to meet most use environments.

[0004] This results in an awkward height range for the level during indoor decoration. Within the range of 0 mm to 500 mm, the construction personnel usually use a board or other device to raise the level, but this method lacks adjustment means and the error will gradually accumulate with the increase in the height of the pad. The height adjustment of the traditional level is very limited and cannot meet the adjustment of the range of 0 mm to 500 mm.

[0005] Therefore, we propose a foldable storage measuring level. SUMMARY

[0006] The purpose of the present application is to provide a foldable storage measuring level to solve the problems raised in the background.

[0007] To achieve the above purpose, the present application provides the following technical solution: a foldable storage measuring level, comprising a level, the bottom end of the level is provided with three groups of supporting feet for supporting the level.

[0008] The lower end of the level is connected with the pull-up assembly which lifts the level, the pull-up assembly is received under the level in the way of multi-stage extension, the pull-up assembly comprises a base, the upper end of the base is fixedly connected with a telescopic ring four, the inside of the telescopic ring four is sleeved with a telescopic ring three, a telescopic ring two and a telescopic ring one, the upper end of the telescopic ring one is fixedly connected with a connecting plate which is fixedly connected with the level;

[0009] The foot stretches out to both sides along the base, and the extension length cooperates with the lifting height of the pull-up assembly.

[0010] Wherein, the telescopic ring three is several groups, the diameters of the telescopic ring three gradually decrease, the large-diameter telescopic ring three is sleeved outside the small-diameter telescopic ring three, the telescopic ring two is located inside the telescopic ring three with the smallest diameter, the annular inner surfaces of the telescopic ring four, the telescopic ring three and the telescopic ring two are provided with sliding grooves, the telescopic ring one, the telescopic ring two and the telescopic ring three are fixedly connected with sliding blocks at the corresponding positions of the sliding grooves.

[0011] Wherein, the upper end of the base is provided with a push groove, the inside of the push groove is slidably connected with a telescopic plate, one end of the telescopic plate is fixedly connected with the foot, and the other end is fixedly connected with spring three between the push groove, the end of the telescopic plate away from the foot is fixedly connected with a push plate, the push plate and the telescopic plate are designed at right angles, and the upper end edge of the push plate close to the foot is designed as an inclined structure.

[0012] Wherein, the sliding grooves on the inner surfaces of the telescopic ring two and the telescopic ring three are provided with insertion holes, the upper end of the insertion hole is provided with an insertion slot, and the insertion slot extends to the annular outer surfaces of the telescopic ring two and the telescopic ring three, the inside of the insertion slot is slidably connected with an insertion pin, spring one is fixedly connected between the insertion pin and the insertion slot, the lower end outer surface of the insertion pin is provided with a top groove at the corresponding position of the insertion hole, a top rod is fixedly connected at the corresponding position of the sliding block and the insertion hole, the top rod passes through the insertion hole and contacts the top groove, the annular inner surface of the telescopic ring three is provided with a groove at the corresponding position of the insertion slot, and the annular inner surface of the telescopic ring four is also provided with a groove.

[0013] Wherein, the inner surface of the sliding groove is provided with a connecting groove, the inside of the connecting groove is slidably connected with a connecting rod, spring two is fixedly connected between the connecting rod and the connecting groove, the connecting groove is designed as an "L" shape structure as a whole, the upper end of the connecting rod is fixedly connected with a clamping block, and the sliding block is provided with a clamping slot at the corresponding position of the clamping block.

[0014] Wherein, the connecting groove is provided with a sliding groove close to the outer surface of the lower end, the inside of the sliding groove is slidably connected with a sliding block matched therewith, the end of the sliding block away from the sliding groove is fixedly connected with a resisting block, the upper end of the resisting block is designed as an inclined structure, and the lower end of the connecting rod is also designed as an inclined structure at the corresponding position of the resisting block.

[0015] The air inlet hole is internally provided with a single-way valve, the telescopic plate and the push groove are kept sealed, the telescopic ring one, the telescopic ring two, the telescopic ring three and the telescopic ring four are kept sealed, and the spring five is fixedly connected between the outer surface of the upper end of the base and the outer surface of the lower end of the connecting plate.

[0016] The upper end of the air inlet hole is designed in a conical structure, the outer surface of the upper end of the single-way valve is fixedly connected with a sealing block matched with the conical structure, the sealing block is annular and cannot hinder the flow of the single-way valve gas, the annular inner surface of the air inlet hole is provided with a limiting groove limiting the movement direction of the single-way valve, the limiting groove is internally and slidably connected with a limiting block fixedly connected with the single-way valve, and the spring four is fixedly connected between the limiting block and the air inlet hole.

[0017] The annular outer surface of the single-way valve away from the sealing block is provided with a spiral groove, the lower end of the single-way valve extends to the outside of the air inlet hole, the lower end of the outer surface of the base is rotatably connected with a knob through a bearing at a position corresponding to the air inlet hole, the knob is annular and wraps the extended part of the single-way valve, the inner surface of the knob is connected with a guide block at a position corresponding to the spiral groove, the maximum diameter of the air inlet hole is greater than the maximum diameter of the single-way valve, and the minimum diameter of the air inlet hole is equal to the minimum diameter of the sealing block.

[0018] The application has at least the following beneficial effects:

[0019] 1. By setting the telescopic ring one, the telescopic ring two, the telescopic ring three and the telescopic ring four on the base, and cooperating with each other, when the user needs to raise the height of the level, the level is directly pulled up by hand, the telescopic ring one slides upward in the telescopic ring two, until the slider on the surface of the telescopic ring one moves to the top end of the sliding groove in the telescopic ring two, the telescopic ring two is unlocked by extruding the pin, and moves upward under the action of the pulling force, the telescopic ring three with gradually increasing diameter is gradually unlocked according to the lifting sequence, the stability of the lifting assembly when lifting the level is increased, the height of the level is adjusted through the lifting assembly, the required height under different working conditions is met, and the push plate in contact with the inner surface is pushed outward by the push plate and the supporting leg under the action of the spring three along with the upward movement of the telescopic ring one, the telescopic ring two and the telescopic ring three, the stability of the level when placed is further increased.

[0020] 2. After the lifting assembly is raised, external air enters between the connecting plate and the base through a one-way valve. By filling the space with gas, the lifting assembly provides greater support to the level at different heights. When the user needs to lower the level, simply turn the knob to open the air inlet. The internal air is then expelled by the compression of spring five. At the same time, spring five pulls the connecting plate downwards, applying pressure and forcing several sets of telescopic rings three to gradually retract onto the base surface. This structure enables the level to have a stronger height adjustment capability and reduces dependence on external equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the level and lifting assembly of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the lifting component of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the first telescopic ring, the second telescopic ring, and the third telescopic ring of the present invention;

[0024] Figure 4 This is a cross-sectional structural diagram of the base of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0026] Figure 6 This is a schematic diagram of the single-way valve and spiral groove of the present invention;

[0027] Figure 7 This is an exploded structural diagram of the single-way valve and air inlet of the present invention;

[0028] Figure 8 This is a schematic diagram of the unfolded structure of the lifting component of the present invention;

[0029] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B;

[0030] Figure 10 This is an exploded structural diagram of the connecting rod and connecting groove of the present invention;

[0031] Figure 11 This is a schematic diagram of the unfolded structure of the level and lifting assembly of the present invention;

[0032] Figure 12 For the present invention Figure 8 Enlarged structural diagram at point C;

[0033] Figure 13 For the present invention Figure 4 Enlarged structural diagram at point D.

[0034] In the figure: 1, level; 10, foot; 2, lifting assembly; 20, connecting plate; 21, base; 22, telescopic ring one; 23, telescopic ring two; 24, telescopic ring three; 25, telescopic ring four; 26, sliding block; 27, clamping groove; 28, bolt; 29, insertion slot; 30, spring one; 31, engaging groove; 32, engaging rod; 33, clamping block; 34, recess; 35, resisting block; 36, sliding groove; 37, sliding block; 38, sliding groove; 39, insertion hole; 40, spring two; 41, jacking rod; 42, push plate; 43, spring three; 44, telescopic plate; 45, push groove; 46, jacking groove; 50, knob; 51, air inlet; 52, one-way valve; 53, sealing block; 54, limiting groove; 55, limiting block; 56, spring four; 57, spiral groove; 58, guide block; 59, spring five. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0036] Please refer to Figures 1-13 The present application provides a technical solution: a foldable and storable measuring level, comprising a level 1, the bottom end of the level 1 is provided with three groups of supporting feet 10 supporting the level 1;

[0037] The lower end of the level 1 is connected with a lifting assembly 2 lifting the level 1, the lifting assembly 2 is stored under the level 1 in a multi-stage telescopic manner, the lifting assembly 2 comprises a base 21, the upper end of the base 21 is fixedly connected with a telescopic ring four 25, and the telescopic ring four 25 is sleeved with a telescopic ring three 24, a telescopic ring two 23 and a telescopic ring one 22 inside, the upper end of the telescopic ring one 22 is fixedly connected with a connecting plate 20 fixedly connected with the level 1, when the user needs to adjust the height of the level 1, directly presses the base 21 to lift the level 1, the telescopic ring one 22, the telescopic ring two 23 and the telescopic ring three 24 will slide upward respectively until the expected height is reached, using the layout of whole into parts, using the diameter advantage of the level 1, the telescopic ring one 22 and the telescopic ring two 23 are all stored at the bottom of the level 1, while ensuring a larger height adjustment range, the height of the lifting assembly 2 is shortened, the structure of the lifting assembly 2 is compact enough, and the height adjustment range of the level 1 is increased through the above structure, which better adapts to the construction environment;

[0038] The foot 10 stretches outwards along the base 21, and the stretching length matches the lifting height of the lifting assembly 2. After the lifting assembly 2 lifts the level 1, the foot 10 also moves outwards, increasing the stability of the whole level 1.

[0039] Please refer to Figures 2-4 , the telescopic ring three 24 is in several groups, and the diameters of the telescopic ring three 24 in the several groups decrease successively. The telescopic ring three 24 with a large diameter is sleeved outside the telescopic ring three 24 with a small diameter. The telescopic ring two 23 is located inside the telescopic ring three 24 with the smallest diameter. The annular inner surfaces of the telescopic ring four 25, the telescopic ring three 24 and the telescopic ring two 23 are all provided with sliding grooves 38. The telescopic ring one 22, the telescopic ring two 23 and the telescopic ring three 24 are all fixedly connected with sliding blocks 26 at positions corresponding to the sliding grooves 38. When a user lifts the level 1, the telescopic ring one 22 slides inside the telescopic ring two 23, the telescopic ring two 23 slides inside the telescopic ring three 24, the telescopic ring three 24 with a smaller diameter slides inside the telescopic ring three 24 with a larger diameter, and the telescopic ring three 24 with the largest diameter slides inside the telescopic ring four 25. The sliding grooves 38 and the sliding blocks 26 ensure the stability of the telescopic ring one 22, the telescopic ring two 23, the telescopic ring three 24, the telescopic ring four 25, the telescopic ring one 22, the telescopic ring two 23 and the telescopic ring three 24 during sliding.

[0040] Please refer to Figure 3 , 4 , 6 and Figure 8 , the base 21 is provided with a pushing groove 45 at the upper end. The telescopic plate 44 is slidably connected inside the pushing groove 45. One end of the telescopic plate 44 is fixedly connected with the foot 10. A spring three 43 is fixedly connected between the other end of the telescopic plate 44 and the pushing groove 45. The end of the telescopic plate 44 away from the foot 10 is fixedly connected with a pushing plate 42. The pushing plate 42 and the telescopic plate 44 are designed at a right angle. The upper end edge of the pushing plate 42 close to the foot 10 is designed as an inclined structure. When the telescopic ring one 22 and the telescopic ring two 23 move upwards, the inclined surface of the pushing plate 42 is in contact with the lower end outer surface edge of the telescopic ring one 22 and the telescopic ring two 23. With the upward movement of the telescopic ring one 22 and the telescopic ring two 23, the pushing plate 42 loses the resistance limiting and moves outwards along the pushing groove 45 together with the telescopic plate 44 under the action of the spring three 43, thereby driving the foot 10 to expand outwards, increasing the overall stability of the support. The inclined surface of the pushing plate 42 is always in contact with the telescopic ring three 24 or the telescopic ring two 23 under the action of the spring three 43.

[0041] Please refer to Figure 9 , 10 and Figure 12 , 13The upper end of the insertion hole 39 is provided with an insertion slot 29, and the insertion slot 29 extends to the annular outer surface of the telescopic ring two 23 and the telescopic ring three 24. The insertion slot 29 is slidably connected with a plug pin 28. The plug pin 28 is fixedly connected with a spring one 30 between the plug pin 28 and the insertion slot 29. The upper end of the telescopic ring two 23 is provided with a top slot 46 corresponding to the position of the insertion hole 39. The telescopic ring three 24 is provided with a recess 34 corresponding to the position of the insertion slot 29. When the level 1 is in the original state, the lifting assembly 2 is contracted, and the plug pin 28 in the telescopic ring two 23 and the telescopic ring three 24 is located in the recess 34 away from the one end of the spring one 30. At this time, only the telescopic ring one 22 is in a movable state. When the sliding block 26 on the outer surface of the telescopic ring one 22 moves to the top of the sliding groove 38 in the inner surface of the telescopic ring two 23, the sliding block 26 fixedly connected with the telescopic ring one 22 will pass the top rod 41 through the insertion hole 39, and the end portion thereof is in contact with the top slot 46 of the plug pin 28. The top slot 46 is designed in an inclined structure. After being extruded by the top rod 41, the plug pin 28 will move along the insertion slot 29 to the spring one 30 and extrude the spring one 30. At this time, the end portion of the plug pin 28 is separated from the recess 34 in the outer surface of the telescopic ring three 24. At this time, the telescopic ring two 23 is unlocked and moves upward. Through the above technical scheme, when the height of the level 1 is lifted, the telescopic ring one 22 with the smallest diameter moves upward first, and then the telescopic ring two 23 moves upward. The larger the diameter of the telescopic ring three 24 is, the later the telescopic ring three 24 moves upward. Under the action of the structure, the movement order of the telescopic ring one 22, the telescopic ring two 23 and the telescopic ring three 24 is limited, so that the length of the supporting leg 10 expanded in the transverse direction is in direct proportion to the lifting height of the level 1, that is, the higher the lifting assembly 2 is, the longer the supporting leg 10 is expanded. When the sliding block 26 on the surface of the telescopic ring one 22, the telescopic ring two 23 and the telescopic ring three 24 moves to the top of the sliding groove 38, the clamping groove 27 on the surface of the sliding block 26 is aligned with the opening of the connecting groove 31. The clamping block 33 in the connecting groove 31 is clamped into the clamping groove 27 under the traction of the spring two 40. At this time, the telescopic ring one 22 and the telescopic ring two 23 are connected as a whole through the clamping groove 27 and the clamping block 33 on the surface of the sliding block 26.

[0042] Please refer to Figure 9 , 10The inner surface of the sliding groove 38 is provided with a connecting groove 31, the connecting groove 31 is slidably connected with a connecting rod 32, the connecting rod 32 and the connecting groove 31 are fixedly connected with spring two 40, the connecting groove 31 is designed in whole as "L" shape structure, and both ends are open, the upper end of the connecting rod 32 is fixedly connected with a clamping block 33, the connecting rod 32 and the clamping block 33 are made of smooth metal, which increases the strength and reduces the friction, the sliding block 26 is provided with a clamping groove 27 at the corresponding position of the clamping block 33, the outer surface of the lower end of the connecting groove 31 is provided with a sliding groove 36, the sliding groove 36 is slidably connected with a sliding block 37 matched therewith, the end of the sliding block 37 away from the sliding groove 36 is fixedly connected with a resisting block 35, the upper end of the resisting block 35 is designed in inclined structure, the position corresponding to the lower end of the connecting rod 32 and the resisting block 35 is also designed in inclined structure, which can better trigger the displacement of the connecting rod 32 through the resisting block 35, when the user needs to lower the height of the level 1, the user presses downwardly the level 1, at this time, the telescopic ring three 24 with the largest diameter moves downwardly along the sliding groove 38 in the telescopic ring four 25 until the bottom of the resisting block 35 contacts with the outer surface of the upper end of the base 21, the inclined surface of the resisting block 35 contacts with the inclined surface of the connecting rod 32, with the increase of the pressing force, the resisting block 35 drives the connecting rod 32 to move upwardly along the sliding groove 36 through the sliding block 37, the connecting rod 32 moves in the connecting groove 31 and pulls up the spring two 40, the connecting rod 32 drives the clamping block 33 at the top to be separated from the clamping groove 27 on the surface of the sliding block 26, at this time, the sliding block 26 constrained by the clamping block 33 is released from the limitation and can slide downwardly along the sliding groove 38, through the above structure, the telescopic ring three 24 with the smaller diameter is reset more backwardly, then the telescopic ring two 23 is reset, and finally the telescopic ring one 22 is reset, in cooperation with the inclined surface of the push plate 42, when the height of the lifting assembly 2 is lowered, the unfolded length of the supporting leg 10 still maintains the proportional relationship with the height of the lifting assembly 2, that is, when the height of the lifting assembly 2 is lowered, the unfolded length of the supporting leg 10 is reduced, through the above structure, the stability of the whole structure can be increased.

[0043] Please refer to Figures 5-7The bottom base 21 is provided with an air inlet hole 51 in the center, a single-way valve 52 is arranged inside the air inlet hole 51, the telescopic plate 44 is sealed with the push groove 45, the telescopic ring one 22, the telescopic ring two 23, the telescopic ring three 24 and the telescopic ring four 25 are all sealed, the spring five 59 is fixedly connected between the outer surface of the upper end of the bottom base 21 and the outer surface of the lower end of the connecting plate 20, when the user pulls up the level 1, the external air enters the space between the connecting plate 20 and the bottom base 21 through the single-way valve 52, the design of the single-way valve 52 ensures that the gas inside the space cannot overflow, when any one of the telescopic ring three 24 moves to the middle position of the sliding groove 38 matched therewith through the sliding block 26, the height of the lifting assembly 2 is lifted by relying on the gas support, the range after the height adjustment is fixed, and the practicability of the overall structure is improved.

[0044] The upper end of the air inlet hole 51 is designed in a conical structure, the outer surface of the upper end of the single-way valve 52 is fixedly connected with a sealing block 53 matched with the conical structure, the sealing block 53 is annular and cannot hinder the flow of the gas of the single-way valve 52, the annular inner surface of the air inlet hole 51 is provided with a limiting groove 54 limiting the movement direction of the single-way valve 52, the limiting groove 54 is slidably connected with a limiting block 55 fixedly connected with the single-way valve 52, the limiting block 55 and the air inlet hole 51 are fixedly connected with a spring four 56, in order to facilitate the resetting of the lifting assembly 2, when the user needs to reset, the single-way valve 52 and the sealing block 53 move downward along the limiting groove 54 through the limiting block 55, the air between the connecting plate 20 and the bottom base 21 is discharged through the gap between the sealing block 53 and the conical air inlet hole 51, and the power for the automatic downward movement of the connecting plate 20 comes from the spring five 59 after being pulled up.

[0045] Please refer to Figure 5 , 7 , the annular outer surface of the single-way valve 52 away from the sealing block 53 is provided with a spiral groove 57, the lower end of the single-way valve 52 extends to the outside of the air inlet hole 51, the lower end of the outer surface of the bottom base 21 is rotatably connected with a knob 50 corresponding to the air inlet hole 51 through a bearing, the knob 50 is annular and wraps the extended part of the single-way valve 52, the inner surface of the knob 50 is connected with a guide block 58 corresponding to the spiral groove 57, the maximum diameter of the air inlet hole 51 is greater than the maximum diameter of the single-way valve 52, and the minimum diameter of the air inlet hole 51 is equal to the minimum diameter of the sealing block 53, in order to increase the stability of the adjustable single-way valve 52, the knob 50 is added, through the guide block 58 inside the knob 50 and the spiral groove 57 on the surface of the single-way valve 52, the user rotates the knob 50, the guide block 58 rotates synchronously, under the guidance of the spiral groove 57, the single-way valve 52 moves downward, the knob 50 is hollow to facilitate the flow of air, through the above structure, the operation steps can be simplified, and the adjustment and storage can be quickly completed in one step, and the structure is simple and has high practicability.

[0046] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve to identify different entities or actions from each other, without necessarily requiring or implying any actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0047] While embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, changes, and variations can be made in the embodiments without departing from the spirit and scope of the present application, which is defined by the appended claims and their equivalents.

Claims

1. A foldable and retractable measuring level, comprising a level (1), wherein the bottom end of the level (1) is provided with three sets of support legs (10) for supporting the level (1), characterized in that: The lower end of the level (1) is connected to a lifting assembly (2) that lifts the level (1). The lifting assembly (2) is stored below the level (1) in a multi-stage telescopic manner. The lifting assembly (2) includes a base (21). The upper end of the base (21) is fixedly connected to a telescopic ring four (25). The telescopic ring four (25) is fitted with a telescopic ring three (24), a telescopic ring two (23), and a telescopic ring one (22). The upper end of the telescopic ring one (22) is fixedly connected to a connecting plate (20) that is fixedly connected to the level (1). The support leg (10) extends and retracts along the base (21) to both sides, and the extension length is matched with the lifting height of the lifting assembly (2).

2. The foldable and retractable measuring level according to claim 1, characterized in that: The number of telescopic rings three (24) is several groups, and the diameter of the several groups of telescopic rings three (24) decreases in sequence. The larger diameter telescopic rings three (24) are fitted outside the smaller diameter telescopic rings three (24). The telescopic ring two (23) is located inside the telescopic ring three (24) with the smallest diameter. The inner surface of the telescopic ring four (25), telescopic ring three (24) and telescopic ring two (23) are all provided with sliding grooves (38). The telescopic ring one (22), telescopic ring two (23) and telescopic ring three (24) are all fixedly connected to the sliding grooves (38) with sliders (26).

3. The foldable and retractable measuring level according to claim 2, characterized in that: The upper end of the base (21) is provided with a push groove (45), and a telescopic plate (44) is slidably connected inside the push groove (45). One end of the telescopic plate (44) is fixedly connected to the support leg (10), and the other end is fixedly connected to the push groove (45) with a spring (43). The end of the telescopic plate (44) away from the support leg (10) is fixedly connected with a push plate (42). The push plate (42) and the telescopic plate (44) are designed at a right angle, and the upper edge of the push plate (42) is inclined on the side close to the support leg (10).

4. The foldable and retractable measuring level according to claim 2, characterized in that: The upper end of the sliding groove (38) on the inner surface of the telescopic ring two (23) and the telescopic ring three (24) is provided with a socket (39). The upper end of the socket (39) is provided with a slot (29), and the slot (29) extends to the outer annular surface of the telescopic ring two (23) and the telescopic ring three (24). The slot (29) is slidably connected with a pin (28). A spring (30) is fixedly connected between the pin (28) and the slot (29). The lower outer surface of the pin (28) is provided with a top groove (46) at the position corresponding to the socket (39). The slider (26) is fixedly connected with a top rod (41) at the position corresponding to the socket (39). The top rod (41) passes through the socket (39) and contacts the top groove (46). The inner annular surface of the telescopic ring three (24) is provided with a groove (34) at the position corresponding to the slot (29). The inner annular surface of the telescopic ring four (25) is also provided with a groove (34).

5. The foldable and retractable measuring level according to claim 4, characterized in that: The inner surface of the slide groove (38) is provided with a connecting groove (31), and a connecting rod (32) is slidably connected inside the connecting groove (31). A spring (40) is fixedly connected between the connecting rod (32) and the connecting groove (31). The connecting groove (31) is designed as an "L" shape. A locking block (33) is fixedly connected to the upper end of the connecting rod (32). A locking groove (27) is provided at the corresponding position of the slider (26) and the locking block (33).

6. The foldable and retractable measuring level according to claim 5, characterized in that: The connecting groove (31) has a sliding groove (36) on the side near the lower outer surface. A matching sliding block (37) is slidably connected inside the sliding groove (36). A resisting block (35) is fixedly connected to the end of the sliding block (37) away from the sliding groove (36). The upper end of the resisting block (35) is designed with an inclined structure. The lower end of the connecting rod (32) is also designed with an inclined structure corresponding to the position of the resisting block (35).

7. The foldable and retractable measuring level according to claim 2, characterized in that: The base (21) has an air inlet (51) through the center. The air inlet (51) is equipped with a one-way valve (52). The telescopic plate (44) and the push groove (45) are sealed together. The telescopic ring one (22), telescopic ring two (23), telescopic ring three (24) and telescopic ring four (25) are all sealed together. A spring five (59) is fixedly connected between the outer surface of the upper end of the base (21) and the outer surface of the lower end of the connecting plate (20).

8. The foldable and retractable measuring level according to claim 7, characterized in that: The upper end of the air inlet (51) is designed with a conical structure. A sealing block (53) matching the conical shape is fixedly connected to the outer surface of the upper end of the single-way valve (52). The sealing block (53) is annular and cannot obstruct the flow of gas in the single-way valve (52). A limiting groove (54) restricting the movement direction of the single-way valve (52) is opened on the annular inner surface of the air inlet (51). A limiting block (55) fixedly connected to the single-way valve (52) is slidably connected inside the limiting groove (54). A spring (56) is fixedly connected between the limiting block (55) and the air inlet (51).

9. The foldable and retractable measuring level according to claim 8, characterized in that: The one-way valve (52) has a spiral groove (57) on its annular outer surface away from the sealing block (53). The lower end of the one-way valve (52) extends to the outside of the air inlet (51). The lower outer surface of the base (21) is rotatably connected to the air inlet (51) via a bearing. The knob (50) is annular and covers the extended part of the one-way valve (52). The inner surface of the knob (50) is connected to the spiral groove (57) at a height. The maximum diameter of the air inlet (51) is greater than the maximum diameter of the one-way valve (52), and the minimum diameter of the air inlet (51) is equal to the minimum diameter of the sealing block (53).

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