A level for carpentry work

Abstract

The application relates to the technical field of building construction tools, and discloses a carpentry construction level, which is used to solve the problem that manual alignment cannot guarantee precision, and the positioning leg is rotated to the outer side of a bearing main body by a supporting leg arm, the medium in the supporting cylinder frame is pressed outwards by the elastic force of a liquid pressure spring, the alignment ball in the bearing main body is used to level under the action of gravity, when the bearing main body is inclined, the alignment ball no longer blocks the liquid discharge channel, so that the medium in the supporting cylinder frame is discharged from the liquid discharge channel, the positioning leg is withdrawn into the supporting cylinder frame, thereby reducing the supporting height of the supporting cylinder frame, when the alignment ball and the bearing main body are both in a horizontal state, the alignment ball blocks the liquid discharge channel and makes the medium in the supporting cylinder frame unable to be discharged, so that the positioning leg always maintains the required height for supporting, the bearing main body can always be in a horizontal state, and finally, the automatic leveling effect is realized.

Description

Technical Field

[0001] This application relates to the technical field of construction tools, and in particular to a level for woodworking. Background Technology

[0002] A carpentry level is a crucial auxiliary tool in the carpentry industry. It projects extremely precise horizontal and vertical lines, greatly improving the measurement accuracy and positioning efficiency of carpenters during construction. However, current mainstream levels on the market still have some limitations in terms of leveling and stability.

[0003] First, most levels still rely on traditional manual leveling methods, which involve observing the bubble level inside the level. Carpenters must manually adjust the three support legs at the bottom of the level until the bubble is centered to achieve a theoretically level state. However, this process is highly dependent on the operator's experience and skill; therefore, in practical applications, the accuracy of the level is often difficult to guarantee consistently, especially in complex and variable construction environments.

[0004] Secondly, the existing support legs of levels are typically designed to be compact and fixed in position, which limits the effective expansion of their bottom support area. When the level is subjected to external forces or vibrations, its small support area often makes it prone to losing stability, affecting the reliability of the measurement results. Although increasing the support area can improve stability, this change would increase the overall size of the level, not only increasing the difficulty of storage and transportation but also reducing its portability and flexibility in confined construction spaces. Summary of the Invention

[0005] This application proposes a level for woodworking construction, which has the advantages of rotating and adjusting the positioning legs and automatic leveling, in order to solve the problems mentioned in the background art that manual leveling cannot guarantee accuracy and has poor positioning stability.

[0006] To achieve the above objectives, this application adopts the following technical solution: a woodworking level, comprising: a supporting body, laser projection units for projecting horizontal and vertical lines are provided on the sides and top, a leveling base for leveling adjustment is installed at the bottom, the leveling base being filled with a liquid medium; a support shaft installed at the bottom of the leveling base, a synchronous pulley installed at the top of the support shaft, the synchronous pulleys being connected by a synchronous belt drive, a support arm fixedly installed at the bottom of the support shaft, and a support cylinder frame tightly connected to the end of the support arm, a central liquid inlet channel is provided inside the support shaft, and a drain channel communicating with the central liquid inlet channel is provided in the middle of the leveling base; and a hydraulic piston fitted onto the support cylinder frame. Inside, a reset lever is fixedly installed at the top of the hydraulic piston, and a positioning leg is fixed at the bottom. A hydraulic spring is connected between the bottom of the hydraulic piston and the bottom of the inner side of the support cylinder. A leveling ball is movably installed in the middle of the leveling base, and a counterweight ball is provided at the bottom of the leveling ball. A ball-pressing frame that limits the positioning of the leveling ball is fastened to the middle of the leveling base. The hydraulic chamber is formed by the inside of the support cylinder and the top of the hydraulic piston, and communicates with the intermediate liquid delivery channel. An inlet channel is opened in the middle of the leveling base, and the inlet channel is used to connect the inner cavity of the leveling base and the intermediate liquid delivery channel. A one-way interception mechanism is set inside the leveling base and in the inlet channel to realize the one-way flow of the medium inside the leveling base into the inlet channel.

[0007] Furthermore, a limited moving hole is opened at the bottom of the leveling base.

[0008] Furthermore, the drainage channel is a cylindrical, small-diameter infusion channel.

[0009] Furthermore, a directional bevel gear is movably installed inside the leveling base, and a magnetic stop rod is movably installed on the side of the rotating shaft of the directional bevel gear. A top rod spring is connected between the magnetic stop rod and the directional bevel gear. A detection intermediate rod is installed on the top of the rotating shaft of the directional bevel gear, and a detection lamp is fixedly connected to the top of the detection intermediate rod. A detection switch is fixedly installed inside the leveling base. A detection top rod is fixed on the top of the alignment ball. The detection switch, power supply, and detection lamp are connected in series.

[0010] Furthermore, a starting rod is movably installed inside the leveling base, and a start switch located on one side of the starting rod is fixedly installed inside the leveling base; a limiting frame is fixedly connected to the bottom of the detection intermediate rod, and a limiting push spring is connected between the limiting frame and the leveling base; an anti-reverse top seat is movably installed in the limiting frame, and the anti-reverse top seat abuts against the step surface inside the leveling base under the elastic force of the anti-reverse push spring, and the step surfaces inside the leveling base are transitioned by inclined surfaces.

[0011] Furthermore, a rectangular groove is provided in the middle of the anti-reverse top seat, and a protrusion that mates with the groove is provided on the top inner side of the directional bevel gear shaft.

[0012] Furthermore, a magnetic block is fixed to the top of the inner side of the directional bevel gear shaft.

[0013] Furthermore, a limit screw is coaxially fixedly installed on the top of the support leg shaft, and a reset inclined seat located below the end of the starter rod is threadedly connected to the outer side of the limit screw.

[0014] Furthermore, the first type of unidirectional flow interception mechanism includes: a liquid control piston, which is movably installed in the liquid inlet channel and located on one side of the alignment ball; a reset push spring, which is fixed on the inner side of the leveling base; a pressure boosting spring, which is fixed on the inner bottom of the support cylinder; and a movement limiting groove, which is opened on the inner side of the leveling base and located above the detection switch.

[0015] Furthermore, the second type of one-way flow control mechanism is a one-way valve.

[0016] The present invention has the following beneficial effects:

[0017] This application provides a woodworking level that integrates rotational adjustment and automatic leveling functions, significantly improving construction efficiency and positioning accuracy. The level's positioning legs are connected to a support shaft via a precisely designed support arm, enabling flexible rotation. For transport or storage, the positioning legs can easily rotate to the bottom of the supporting body, reducing overall size and facilitating carrying. When the level is in the working position and the positioning legs rotate to the outside of the supporting body, its unique unfolding structure significantly increases the support area, effectively resisting external interference and vibration, ensuring stable horizontal positioning.

[0018] Furthermore, when the support arm rotates the positioning leg to the outside and unfolds the support, the medium inside the support cylinder is compressed by the hydraulic spring. At the same time, a aligning ball is installed inside the support body that can automatically adjust its position according to the direction of gravity. Once the support body tilts, the aligning ball immediately deviates from its original position, no longer tightly sealing the drainage channel, allowing the medium inside the support cylinder to slowly drain out through the drainage channel, thereby reducing the support height of the support cylinder until the support body returns to a horizontal state.

[0019] During this process, the alignment ball not only opens the drainage channel when tilted, but also quickly resets itself when the supporting body reaches a horizontal position, re-sealing the drainage channel to prevent further discharge of the medium. In this way, the positioning leg can automatically adjust to the required height, providing stable and precise support for the supporting body.

[0020] In conclusion, this woodworking level, with its unique rotation adjustment and automatic leveling mechanism, not only simplifies the operation process but also significantly improves the accuracy and stability of horizontal positioning, making it an indispensable and efficient tool in modern woodworking. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0022] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0023] Figure 1 This is a schematic diagram of the overall external three-dimensional structure;

[0024] Figure 2 This is a schematic diagram of the overall bottom three-dimensional structure;

[0025] Figure 3 This is a schematic diagram of the overall internal planar sectional structure;

[0026] Figure 4 for Figure 3 Enlarged structural diagram at point E;

[0027] Figure 5 for Figure 3 Enlarged structural diagram at point F;

[0028] Figure 6 for Figure 3 Enlarged structural diagram at point G in the middle;

[0029] Figure 7 A schematic diagram of the internal three-dimensional structure of the leveling base;

[0030] Figure 8 A schematic diagram of the three-dimensional structure of the repositioning inclined seat and its installation location;

[0031] Figure 9 This is a schematic diagram showing the structure and assembly position between the directional bevel gear and the intermediate detection rod.

[0032] In the diagram: 1. Support body; 2. Leveling base; 200. Liquid inlet channel; 201. Liquid outlet channel; 3. Support leg shaft; 300. Intermediate inlet channel; 4. Support leg arm; 5. Support cylinder frame; 500. Pressure chamber; 6. Reset pressure rod; 7. Positioning leg; 8. Detection light; 9. Laser projection unit; 10. Limiting hole; 11. Alignment ball; 110. Counterweight ball; 111. Detection top rod; 12. Orientation bevel gear; 13. Detection intermediate rod; 14. Starting rod; 140 15. Start switch; 16. Reset inclined seat; 17. Limit screw; 18. Synchronous pulley; 19. Synchronous belt; 20. Limiting frame; 21. Limiting push spring; 22. Anti-reverse top seat; 23. Anti-reverse push spring; 24. Detection switch; 25. Limiting groove; 26. Magnetic rod; 27. Push rod spring; 28. Magnetic block; 29. ​​Ball pressure frame; 20. Liquid control piston; 20. Reset push spring; 21. Liquid pressure piston; 22. Liquid pressure spring; 23. Pressure boosting spring. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example 1

[0034] Please see Figure 1 and Figure 2 As can be seen, the supporting body 1, as the main part of the entire mechanism, uses laser projection units 9 set on the sides and top of the supporting body 1 to project horizontal and vertical lines, facilitating accurate positioning by the carpenter. Regarding the handling and positioning of the supporting body 1, from... Figure 2 As can be seen, a leveling base 2 is installed at the bottom of the supporting body 1, which provides support and horizontal alignment for the supporting body 1. Specifically, three equally angled support leg shafts 3 are movably installed at the bottom of the leveling base 2, combined with... Figure 7 It is evident that each support leg shaft 3 has a corresponding synchronous pulley 17 installed at its top, located within the inner cavity of the leveling base 2. The synchronous pulleys 17 are connected by a synchronous belt 170. When one support leg shaft 3 drives the synchronous pulley 17 to rotate, the synchronous belt 170 and the synchronous pulley 17 drive the three support leg shafts 3 to rotate synchronously. Figure 2 and Figure 7 It is evident that a support arm 4 is fixedly installed at the bottom of the support shaft 3, below the leveling base 2, and a support cylinder 5 is tightly connected to the end of the support arm 4. The support cylinder 5 is a hollow cylinder. A hydraulic piston 26 is housed inside the support cylinder 5, which can move up and down within the support cylinder 5. Simultaneously, a reset lever 6 extending from the top of the support cylinder 5 is fixedly installed at the top of the hydraulic piston 26. A hydraulic spring 260 connects the bottom of the hydraulic piston 26 and the inner bottom of the support cylinder 5. The spring force of the hydraulic spring 260 pushes the hydraulic piston 26 upward, causing it to move upward and push the reset lever 6 upward. The positioning leg 7, fixed to the bottom of the hydraulic piston 26, retracts into the support cylinder 5 due to the upward movement of the hydraulic piston 26, thus reducing the extended length of the positioning leg 7. In practical applications, the positioning leg 7 rests on the ground. When the positioning leg 7 retracts into the support cylinder 5, the support height of the support cylinder 5 on the leveling base 2 is relatively reduced.

[0035] When it is necessary to carry it, by moving any one of the support cylinders 5 towards the bottom center of the leveling base 2, in conjunction with... Figure 2 and Figure 3As can be seen, the bottom of the leveling base 2 is truncated cone-shaped. When the support cylinder 5 rotates via the support arm 4, the reset rod 6 is blocked by the inclined surface of the truncated cone and retracts into the support cylinder 5. The hydraulic piston 26 compresses the hydraulic spring 260. As the support arm 4 retracts, the reset rod 6 is locked into the limiting hole 10 at the bottom of the leveling base 2. Due to the elastic force of the hydraulic spring 260 pushing the hydraulic piston 26, the hydraulic piston 26 pushes the reset rod 6 into the limiting hole 10, thus preventing the support cylinder 5 from deflecting. At this time, the support arm 4 is directly below the leveling base 2, thereby reducing the volume occupied during transportation. At the same time, when the support arm 4 drives the support shaft 3 to rotate, the support shaft 3 is forced to rotate synchronously through the synchronous pulley 17 and the synchronous belt 170, ultimately causing all the positioning legs 7 to move to the bottom of the leveling base 2.

[0036] Finally, after the main body 1 is transported to the required position, the positioning leg 7 is pulled out, causing the hydraulic piston 26 to pull the reset lever 6 away from the limiting hole 10. Then, the support arm 4 is rotated out through the support shaft 3, so that the three support cylinders 5 are relatively far apart, thereby providing a larger support area for the main body 1 and ensuring the stability of the main body 1 during operation.

[0037] Based on this, in order to achieve automatic leveling and positioning of the supporting body 1, combined with Figure 3 , Figure 5 and Figure 7 It can be clearly seen that a locating ball 11 is movably installed in the middle of the leveling base 2, and the locating ball 11 is hemispherical in shape. A counterweight ball 110 is located at the bottom of the locating ball 11. When the supporting body 1 is in a relatively horizontal state, the counterweight ball 110 uses its own weight to drag the locating ball 11 to a relatively horizontal state. Similarly, when the supporting body 1 is tilted, because the counterweight ball 110 pulls the locating ball 11 to remain in a relatively horizontal state, the locating ball 11 and the leveling base 2 will deflect relative to each other. At this time, the leveling base 2 follows the supporting body 1 into a relatively tilted state, and the counterweight ball 110 pulls downwards to bring the top plane of the locating ball 11 to a relatively horizontal state. Figure 7 As can be clearly seen, the leveling base 2 has a ball-pressing frame 24 located above the alignment ball 11 secured by bolts in the middle. The ball-pressing frame 24 is shaped like a "Z". The ball-pressing frame 24 is used to block and limit the movement of the alignment ball 11, preventing it from detaching from the middle of the leveling base 2. This structure can greatly ensure the position of the alignment ball 11.

[0038] Combination Figure 3 , Figure 5 and Figure 7As can be seen, a central infusion channel 300 is provided inside the support leg shaft 3, and a drainage channel 201 communicating with the central infusion channel 300 is provided in the middle of the leveling base 2. One end of the drainage channel 201 is located near the outer side of the alignment ball 11, and the other end is located on the side of the support leg shaft 3 and communicates with the central infusion channel 300. Figure 5 It is evident that one end of the drainage channel 201 is close to the top plane of the alignment ball 11. When the top plane of the alignment ball 11 is relatively horizontal, the side of the alignment ball 11 blocks the drainage channel 201. Similarly, when there is a relative deflection between the alignment ball 11 and the leveling base 2, the alignment ball 11 will not block the drainage channel 201, thus allowing the drainage channel 201 and the inner cavity of the leveling base 2 to communicate directly. (Reference) Figure 6 and Figure 7 It is understood that the inside of the support cylinder 5 and the top of the hydraulic piston 26 form a hydraulic chamber 500 communicating with the intermediate infusion channel 300. In practical applications, the leveling base 2 is filled with a liquid medium, preferably hydraulic oil. When the support arm 4 drives the support cylinder 5 to deflect below the leveling base 2, the reset lever 6 is restricted by the bottom of the leveling base 2, thereby pushing the hydraulic piston 26 to squeeze the hydraulic spring 260. The downward movement of the hydraulic piston 26 causes a decrease in pressure in the hydraulic chamber 500. In order to enable the medium in the inner cavity of the leveling base 2 to be quickly replenished into the hydraulic chamber 500, combined with... Figure 3 , Figure 5 and Figure 7 It can be seen that the leveling base 2 has an inlet channel 200 located below the drain channel 201 in the middle, and the inlet channel 200 is used to connect the inner cavity of the leveling base 2 and the intermediate delivery channel 300. However, in actual arrangement, a one-way interception mechanism is set inside the leveling base 2 and in the inlet channel 200. The one-way interception structure mentioned in this embodiment is preferably a one-way valve. This arrangement allows the medium in the inner cavity of the leveling base 2 to be input into the pressure chamber 500 through the intermediate delivery channel 300 after the pressure in the pressure chamber 500 decreases due to the pressure reduction, until the pressure chamber 500 is filled with the medium. It can be seen that during the transportation process, the support arm 4 retracts the support cylinder 5 to the bottom of the leveling base 2, which reduces the transportation volume on the one hand, and allows the pressure chamber 500 to accumulate enough medium for subsequent leveling on the other hand.

[0039] Afterwards, once the supporting body 1 is transported to the desired position, the supporting cylinder 5 is rotated out using the support arm 4 and placed directly in the desired position. If the supporting body 1 is in a horizontally aligned state at this time, under the gravity of the counterweight ball 110, the top of the alignment ball 11 is also in a relatively horizontal state. Therefore, the side of the alignment ball 11 will block the drainage channel 201. From Figure 6As can be seen, when the positioning leg 7 is placed on the ground, the hydraulic piston 26 moves upward under the push of the positioning leg 7 and the elastic force of the hydraulic spring 260, causing the hydraulic piston 26 to squeeze the medium in the hydraulic chamber 500. Because the inlet channel 200 is equipped with a one-way flow-stopping mechanism, the medium in the hydraulic chamber 500 can only flow back to the inner cavity of the leveling base 2 through the drain channel 201 after passing through the intermediate delivery channel 300. Since the outside of the alignment ball 11 blocks the drain channel 201, the medium in the hydraulic chamber 500 will not be output outward. The positioning leg 7 provides support to the support cylinder 5, and the support cylinder 5 enables the leveling base 2 to drive the bearing body 1 into a horizontal state. At this moment, the bearing body 1 can always maintain a horizontal state, and then work can begin by projecting horizontal and vertical lines through the laser projection unit 9.

[0040] If the supporting body 1 is placed at a relative tilt, Figure 3 For example, if the right side of the supporting body 1 is higher and the left side is lower, the counterweight ball 110, under the action of gravity, keeps the top of the alignment ball 11 in a relatively horizontal state. At this time, the leveling base 2 deflects counterclockwise relative to the alignment ball 11, causing the right side of the alignment ball 11 to be unable to block the drain channel 201. As mentioned above, the medium in the pressure chamber 500, squeezed by the pressure piston 26, always tends to be discharged outwards. When the drain channel 201 is connected, the medium in the pressure chamber 500 will be discharged into the inner cavity of the leveling base 2. At the same time, when the pressure piston 26 moves upwards, the positioning leg 7 retracts into the support cylinder 5, thereby reducing the support height of the support cylinder 5, causing the right side of the leveling base 2 to be relatively lower. As the right support cylinder 5 continues to descend, the leveling base 2 eventually reaches a relatively horizontal state, and the outer side of the alignment ball 11 blocks the drain channel 201 on the right side, thus ensuring that the supporting body 1 remains horizontal. Thus, the supporting body 1 completes automatic horizontal alignment. For alignment in other directions, the process is consistent with the above, ultimately ensuring that the supporting body 1 operates in a horizontal state.

[0041] It should be noted that the drain channel 201 in this application is a small hole to prevent the drain channel 201 from discharging the medium in the pressure chamber 500 too quickly. On the one hand, this avoids the problem of overcorrection caused by the pressure piston 26 moving upward too quickly. On the other hand, it prevents the medium in the pressure chamber 500 from being quickly released by the drain channel 201 before the positioning leg 7 touches the ground after the support cylinder 5 extends from the bottom of the leveling base 2. It can be seen that using a small hole for the drain channel 201 can greatly ensure the stability of the device's movement. Example 2

[0042] Based on Example 1, further improvements are made to facilitate carpenters' understanding of whether the load-bearing structure 1 is relatively level. Please refer to [link / reference needed]. Figure 3 , Figure 4 and Figure 9It can be seen that a directional bevel gear 12 is movably installed inside the leveling base 2, and a magnetic stop rod 22 is movably installed on the side of the rotating shaft of the directional bevel gear 12. A push rod spring 220 is connected between the magnetic stop rod 22 and the directional bevel gear 12. Under the elastic push of the push rod spring 220, the magnetic stop rod 22 is forced to always have a tendency to push outward. A detection intermediate rod 13 is installed on the top of the rotating shaft of the directional bevel gear 12, and a detection lamp 8 extending from the top of the bearing body 1 is fixedly connected to the top of the detection intermediate rod 13. Regarding the electronic control of the detection lamp 8, combined with... Figure 4 As can be seen, a detection switch 20 is fixedly installed on the inner side of the leveling base 2, located above the magnetic stop rod 22. When the magnetic stop rod 22 touches the detection switch 20, the detection switch 20 will turn on and the detection lamp 8 connected in series with the power supply will light up, thereby serving as a warning to the carpenter.

[0043] When the supporting body 1 is relatively tilted, the detection rod 111 fixed at the top of the alignment ball 11 and the directional bevel gear 12 deflect relative to each other. At this time, the magnetic rod 22 does not contact the detection switch 20, and the detection lamp 8 is not lit. This indicates that the supporting body 1 is not in a relatively horizontal state.

[0044] When the supporting body 1 is tilted, the alignment ball 11 is in a relatively horizontal state, while the detection rod 111 is in a relatively vertical state. The detection rod 111 will abut against the inclined surface of the directional bevel gear 12. With the automatic alignment described in Embodiment 1, the detection rod 111 and the directional bevel gear 12 are vertically coaxially aligned. Simultaneously, when the contact area between the directional bevel gear 12 and the detection rod 111 shifts from the inclined surface to the bottom end face of the directional bevel gear 12, the detection rod 111 will be forced to push the directional bevel gear 12 upwards. When the detection rod 111 and the directional bevel gear 12 are vertically aligned, the directional bevel gear 12, pushed by the detection rod 111, forces the magnetic stop rod 22 to move to the detection switch 20. The magnetic stop rod 22 presses against the detection switch 20, forcing the detection switch 20 to connect the detection lamp 8 to the power supply. The detection lamp 8 illuminates, indicating to the carpenter that the supporting body 1 is now horizontal and can proceed with normal work. Example 3

[0045] Further improvements are made based on Embodiment 2. Due to the cluttered nature of construction sites, carpenters are prone to accidentally bumping into the load-bearing body 1 while moving around (or the load-bearing body 1 may move due to vibrations from the working environment), ultimately causing it to tilt. Although the leveling base 2 can self-align, as described in Embodiment 2, its alignment is based on the positioning leg 7 retracting into the support frame 5, utilizing the shortened support height of the support frame 5 to achieve self-leveling. However, in practical applications, if the load-bearing body 1 moves horizontally downwards, the preset horizontal line height will change. This change is not easily noticed by carpenters, leading them to work based on the deviation, severely impacting the quality of their work.

[0046] To solve this problem, we need to combine... Figure 3 and Figure 9 As can be seen, a starting rod 14 is movably installed inside the leveling base 2, and a starter switch 140 is fixedly installed on the inner side of the leveling base 2, located on one side of the starting rod 14. Under normal conditions, the starting rod 14 and the detection intermediate rod 13 are relatively perpendicular. The starter switch 140 is constructed as a jog switch with an internal spring. The spring force pushes the starting rod 14 closer to the detection intermediate rod 13. At this time, the starter switch 140 will not work because it is not under pressure. In actual arrangement, the starter switch 140 serves as the main switch for the laser projection unit 9. Only when the starter switch 140 is pressed and turned on by the starting rod 14 can the laser projection unit 9 in the supporting body 1 operate normally.

[0047] Regarding when the start lever 14 presses the start switch 140 to turn on, in conjunction with Figure 3 , Figure 4 and Figure 9It can be seen that the bottom of the detection intermediate rod 13 is fixedly connected to a limiting frame 18 that moves up and down along the inner side of the directional bevel gear 12, and a limiting spring 180 is connected between the limiting frame 18 and the leveling base 2. The limiting frame 18 is pushed by the elastic force of the limiting spring 180, forcing the detection intermediate rod 13 to move upward. When the limiting frame 18 moves to the top of the inner side of the rotating shaft of the directional bevel gear 12, it will simultaneously push the directional bevel gear 12 upward. When the limiting frame 18 is pushed by the limiting spring 180 and moves to the upper limit, the magnetic stop rod 22 on the directional bevel gear 12 is just below the detection switch 20. At this time, the magnetic stop rod 22 has not yet squeezed the detection switch 20. The advantage of this method is that, in conjunction with the content of Embodiment 2, when the supporting body 1 is horizontally aligned, the directional bevel gear 12 is pushed upward by the limiting frame 18, so that the directional bevel gear 12 is relatively far away from the alignment ball 11, which reduces the resistance of the alignment ball 11 during horizontal alignment and further ensures the accuracy of the alignment ball 11 during horizontal alignment. Only when the alignment ball 11 and the supporting body 1 are both in a relatively horizontal state will the detection top rod 111 contact the bottom of the directional bevel gear 12 and push the magnetic stop rod 22 to squeeze the detection switch 20.

[0048] An anti-reverse support 19 is movably installed in the limiting frame 18, and the anti-reverse support 19, under the elastic force of the anti-reverse push spring 190, abuts against the stepped surface inside the leveling base 2, such as... Figure 4 As shown, the stepped surfaces inside the leveling base 2 are transitioned by inclined surfaces. When the detection intermediate rod 13 and the directional bevel gear 12 move down synchronously, one end of the limiting frame 18 moves along the stepped surface. After passing the inclined surface, the magnetic blocking rod 22 moves to the same stepped surface as the end of the limiting frame 18. Furthermore, combined with... Figure 4 As can be seen, a rectangular groove is provided in the middle of the anti-reverse top seat 19. Correspondingly, a protrusion that mates with the groove is provided on the top inner side of the directional bevel gear 12 shaft. When the protrusion is inserted into the groove, it will restrict the anti-reverse top seat 19 from extending outward. Therefore, when the detection intermediate rod 13 is pushed downward, even if the limiting frame 18 moves to the end of the starting rod 14, if the top of the directional bevel gear 12 shaft is not disengaged from the limiting frame 18, the anti-reverse top seat 19 will be restricted by the directional bevel gear 12 and will not be able to push outward normally and squeeze the starting rod 14.

[0049] Specifically, under normal conditions, the limiting frame 18 is pushed to the top by the elastic force of the limiting spring 180, and the limiting frame 18 abuts against the top of the directional bevel gear 12 shaft and pushes it upward until the magnetic stop rod 22 is below the detection switch 20.

[0050] Next, horizontal alignment is performed according to the method in Embodiment 2. However, unlike Embodiment 2, in this Embodiment 3, the shaft of the directional bevel gear 12 is pushed upwards by the restrictive frame 18, preventing the directional bevel gear 12 from contacting the alignment ball 11 during the leveling process, thus reducing the movement resistance of the alignment ball 11. As the corresponding positioning leg 7 retracts into the support cylinder 5, the supporting body 1 is finally in a relatively horizontal state. At this time, the detection rod 111 on the alignment ball 11 will also push the directional bevel gear 12 further upwards, causing the magnetic stop rod 22 to abut against the detection switch 20. The detection switch 20 is pressed, causing the detection lamp 8 to light up, indicating that the carpenter knows the supporting body 1 is horizontally positioned correctly.

[0051] If the supporting body 1 is not in a horizontal state, pressing down on the detection light 8 will cause the detection intermediate rod 13 to push the movement limiting frame 18 downward. Since the detection top rod 111 does not provide support force to the bottom of the directional bevel gear 12, the directional bevel gear 12 will follow the movement limiting frame 18 downward under its own weight. Figure 4 As can be seen, when the magnetic blocking rod 22 descends and crosses the inclined plane between the stepped grooves, the magnetic blocking rod 22 extends outward, and the magnetic block 23 fixed on the top inner side of the directional bevel gear 12 shaft is no longer blocked by the magnetic blocking rod 22. At this time, the magnetic block 23 is tightly attracted to the limiting frame 18, ensuring that the top inner side of the directional bevel gear 12 shaft is always in contact with the limiting frame 18. At the same time, the protrusion on the directional bevel gear 12 will continue to be inserted into the groove of the anti-reverse top seat 19. As the detection intermediate rod 13 descends, the magnetic block 23 attracts the limiting frame 18, causing the directional bevel gear 12 to follow and descend until the limiting frame 18 moves the anti-reverse top seat 19 to the end of the starting rod 14. Since the anti-reverse top seat 19 is locked at this time and cannot be pushed outward, the starting rod 14 will not be pressed and will not squeeze the start switch 140, and the laser projection unit 9 will not work. It can be seen that this method can ensure that the laser projection unit 9 cannot work normally when the supporting body 1 is not in a horizontal state.

[0052] When the supporting body 1 is in a horizontal state, the carpenter presses the detection light 8 downwards. At this time, the detection light 8 pushes the detection intermediate rod 13 vertically downwards. Since the supporting body 1 is in a relatively horizontal state at this time, the detection top rod 111 provides vertical support for the directional bevel gear 12. When the detection intermediate rod 13 pushes the limiting frame 18 downwards and compresses the limiting spring 180, the protrusion on the top of the inner side of the directional bevel gear 12 shaft also disengages from the groove in the middle of the anti-reverse top seat 19. As the detection intermediate rod 13 continues to press vertically downwards, it pushes the end of the limiting frame 18 to align with the starting rod 14. At this time, under the elastic force of the anti-reverse spring 190, the anti-reverse top seat 19 is pushed to extend towards the starting rod 14 until the starting rod 14 presses the start switch 140, thereby making the laser projection unit 9 start working.

[0053] Furthermore, during normal operation, the supporting body 1 and the leveling ball 11 remain horizontal, and the detection push rod 111 provides support for the directional bevel gear 12, preventing it from falling. If the supporting body 1 tilts due to external influences, a relative deflection will occur between the leveling base 2 and the leveling ball 11, causing the detection push rod 111 to no longer press directly under the directional bevel gear 12. As the directional bevel gear 12 descends, combined with... Figure 4 It can be seen that the magnetic blocking rod 22 will also cross the inclined surface of the inner step of the leveling base 2, and make the magnetic blocking rod 22 and the limiting frame 18 on the same step surface. The magnetic blocking rod 22 no longer blocks the magnetic block 23, and the magnetic attraction of the magnetic block 23 to the limiting frame 18 forces the two to move closer together. Since the anti-reverse top seat 19 is now in the groove where the starting rod 14 is installed, when the limiting frame 18 moves upward, it cannot move upward because it is pushed out by the anti-reverse top seat 19. The magnetic block 23, through its attraction to the limiting frame 18, forces the directional bevel gear 12 to move further towards the limiting frame 18. In actual use, from Figure 3 As can be seen, the bottom of the directional bevel gear 12 has a spherical protrusion. When the detection rod 111 and the directional bevel gear 12 are not vertically aligned, the offset between the detection rod 111 and the spherical protrusion causes the detection rod 111 to move along the spherical protrusion towards the outside of the directional bevel gear 12 when the directional bevel gear 12 is pushed downwards. Combined with the magnetic attraction of the magnetic block 23, which forces the directional bevel gear 12 to move downwards, this will intensify the deflection of the alignment ball 11 by the detection rod 111. Since the outer side of the directional bevel gear 12 has teeth, when the detection rod 111 is positioned beyond the gap between the teeth, it cannot deflect freely. Finally, as the top inner side of the directional bevel gear 12's rotating shaft touches the limiting frame 18, the directional bevel gear 12 also pushes the alignment ball 11 to deflect in one direction and maintains that angle after deflection.

[0054] As described in Embodiment 1, when the alignment ball 11 deflects, it connects the drain channel 201 and the inner cavity of the leveling base 2, thereby continuously discharging the medium in the pressure chamber 500. Since the alignment ball 11 is constantly deflected due to the constraint of the directional bevel gear 12, the corresponding drain channel 201 keeps the inner cavity of the leveling base 2 and the pressure chamber 500 continuously connected. As the pressure spring 260 pushes the pressure piston 26 upward, the medium in the pressure chamber 500 is completely returned to the inner cavity of the leveling base 2. At this time, at least one of the positioning legs 7 in the support frame 5 is completely retracted, which causes the load-bearing body 1 to tilt severely, and the horizontal line emitted by the laser projection unit 9 also tilts severely, thus warning that the woodworking load-bearing body 1 has an inaccurate horizontal alignment problem.

[0055] Even better, because the support arm 4 pushes the support cylinder 5 outward, the three positioning legs 7 can provide the maximum support area for the load-bearing body 1. When one of the positioning legs 7 is completely retracted into the support cylinder 5, the relatively large support area between the positioning legs 7 prevents the tilted load-bearing body 1 from falling over, greatly ensuring that the load-bearing body 1 will not be damaged due to tilting.

[0056] Based on this, in order to ensure that the laser projection unit 9 can be shut down normally after use, combined with Figure 3 , Figure 8 and Figure 9 As can be seen, a limit screw 16 is coaxially fixedly installed on the top of a support leg shaft 3. When the support leg shaft 3 rotates, it will drive the limit screw 16 to rotate synchronously. Correspondingly, a reset inclined seat 15 located below the end of the starting rod 14 is threadedly connected to the outer side of the limit screw 16. Figure 3 As can be seen, the reset inclined seat 15 uses a round rod for guidance, limiting its movement to only vertical. Since the top of the reset inclined seat 15 is inclined, specifically, when the support arm 4 pulls the support cylinder 5 to below the leveling base 2, the reset pressure rod 6 retracts into the limiting hole 10. At this time, the support cylinder 5 retracts to the bottom of the leveling base 2. During this process, the support arm 4 drives the support shaft 3 to rotate, forcing the limiting screw 16 and the reset inclined seat 15 to rotate relative to each other. Driven by the screw, the reset inclined seat 15 pushes the starting rod 14 upwards, causing the starting rod 14 to move to the left away from the start switch 140. This releases the pressure on the start switch 140, stopping the laser projection unit 9 from working; on the other hand, the starting rod 14 pushes the anti-reverse top seat 19 to the left, causing the anti-reverse top seat 19 to retract into the limiting frame 18. When the anti-reverse top seat 19 is fully retracted into the movement limiting frame 18, the anti-reverse top seat 19 will not restrict the upward movement of the movement limiting frame 18. At this time, under the elastic force of the movement limiting spring 180, the movement limiting frame 18 is forced to move upward until the movement limiting frame 18 reaches its top limit. It can be seen that when the laser projection unit 9 needs to be stopped, it means that the carpenter has completed the positioning work. In order to prevent the support cylinder 5 from extending outward through the support arm 4 during the transportation of the load-bearing body 1, resulting in a large transportation volume, the method of this embodiment three is used to ensure that the laser projection unit 9 needs to be stopped when the support cylinder 5 is fully retracted to the bottom of the leveling base 2, thereby forcing the carpenter to retract the support cylinder 5 to stop the whole machine from working.

[0057] Meanwhile, when the support cylinder 5 deflects to the outside of the supporting body 1 using the support leg arm 4, the support leg shaft 3 will drive the limiting screw 16 to rotate in the opposite direction. The limiting screw 16 then pulls the reset inclined seat 15 downwards, moving it away from the starting rod 14, thus releasing the movement restriction on the starting rod 14. Furthermore, when the limiting screw 16 pulls the reset inclined seat 15 downwards, the limited downward stroke of the reset inclined seat 15 prevents excessive deflection of the support leg arm 4. This primarily prevents the support cylinder 5 from dragging the support leg arm 4 to continuously deflect in the same direction. In practical applications, by setting the available sliding length of the reset inclined seat 15 along the circular rod, the outward deflection angle of the support leg arm 4 can also be limited. Example 4

[0058] Based on Embodiments 1 and 3, a further improvement is made as another unidirectional interception structure; please refer to [link / reference]. Figure 3 , Figure 5 and Figure 7 It is clearly visible that a liquid control piston 25 is movably installed in the liquid inlet channel 200, located on one side of the alignment ball 11. The cross-sectional shape of the liquid control piston 25 is "T". From Figure 5 As can be seen, a reset spring 250 located outside the control piston 25 is fixedly connected to the inner side of the leveling base 2. It should be noted that one end of the reset spring 250 is fastened to the leveling base 2, while the other end is not connected to the control piston 25. Under normal conditions, the reset spring 250 is at its normal length, neither stretched nor compressed. When the control piston 25 is attached to the right end of the reset spring 250, it will block the inlet channel 200. Because the middle area of ​​the inlet channel 200 is relatively large, i.e., there is a diameter expansion phenomenon in the middle, when the control piston 25 moves to the right and away from the alignment ball 11, a gap will be left between the control piston 25 and the inner side of the inlet channel 200, so that the inlet channel 200 and the inner cavity of the leveling base 2 are connected, ensuring that the medium inside the leveling base 2 can be connected to the pressure chamber 500 through the inlet channel 200.

[0059] In practical application, as the support frame 5 moves towards the bottom of the leveling base 2 using the support leg arm 4, the bottom of the leveling base 2 presses the reset rod 6 downwards, causing the reset rod 6 to push the hydraulic piston 26 downwards and compress the hydraulic spring 260. This reduces the pressure in the hydraulic chamber 500. During this process, combined with... Figure 5 It can be seen that when the pressure in the inlet channel 200 decreases, it will force the pressure piston 26 to move to the right until the control piston 25 moves to the expansion area of ​​the inlet channel 200. At this time, there is a gap between the control piston 25 and the inlet channel 200. The medium in the inner cavity of the leveling base 2 flows into the pressure chamber 500 after passing through the gap between the control piston 25 and the inlet channel 200, thereby replenishing the medium into the pressure chamber 500.

[0060] When the support cylinder 5 is removed from the bottom of the leveling base 2, the hydraulic spring 260 pushes the hydraulic piston 26 upward and squeezes the medium in the hydraulic chamber 500. The increased pressure of the medium in the hydraulic chamber 500 will cause the medium in the inlet channel 200 to tend to push the control piston 25 to the left until the control piston 25 is removed from the aperture area of ​​the inlet channel 200 and the inlet channel 200 is blocked by the control piston 25. During this process, since the elastic force of the hydraulic spring 260 is relatively smaller than that of the return spring 250, the return spring 250 will not be compressed. The control piston 25 continues to block the inlet channel 200, thereby realizing the one-way interception function.

[0061] In special circumstances, such as when the load-bearing body 1 becomes unstable due to external factors during normal use, as described in Embodiment 3, the anti-reverse top seat 19 will always abut against the end of the starting rod 14, and the magnetic block 23 will continuously attract the movement limiting frame 18, causing the directional bevel gear 12 to continuously press down to the top of the movement limiting frame 18. In this case, the load-bearing body 1 still needs to be used. Resetting it by lifting the load-bearing body 1 and retracting the support arm 4 to the bottom of the leveling base 2 is obviously too cumbersome. Furthermore, after the load-bearing body 1 is lifted, it is difficult to ensure that the positioning leg 7 is in the same position as before. In this situation, refer to... Figure 6 As can be seen, a pressure spring 261 is fixedly installed on the bottom inner side of the support frame 5. When the supporting body 1 tilts unexpectedly during normal use, only the thumb needs to press the reset lever 6 and the other fingers need to lift the support arm 4, so that the reset lever 6 pushes the hydraulic piston 26 to apply pressure to the hydraulic spring 260 first. As mentioned above, when the pressure in the hydraulic chamber 500 decreases, the control piston 25 will move to the right, and the medium in the inner cavity of the leveling base 2 will be transported to the hydraulic chamber 500. As the hydraulic piston 26 continues to press down, the bottom of the hydraulic piston 26 will contact the pressure spring 261 and compress it. At this time, the hydraulic piston 26 compresses the hydraulic spring 260 and the pressure spring 261 simultaneously.

[0062] After each reset lever 6 has been pressed, when the pressure on the reset lever 6 is released, the hydraulic piston 26 is subjected to the combined elastic force of the booster spring 261 and the hydraulic spring 260, causing the hydraulic piston 26 to increase the pressure of the medium in the hydraulic chamber 500. At this time, the pressure in the inlet channel 200 increases, causing the control piston 25 to squeeze the reset push spring 250 and push the control piston 25 to contact the side of the alignment ball 11. Since the side of the alignment ball 11 is spherical, when the control piston 25 comes into contact with the outer spherical part of the alignment ball 11, it forces the alignment ball 11 to tend to move upward until the top plane of the alignment ball 11 comes into contact with the ball-pressing frame 24. Since the number of liquid control pistons 25 corresponds to the number of support cylinders 5, the bottom of the alignment ball 11 is pressed by all three liquid control pistons 25, which eventually causes the top plane of the alignment ball 11 to press against the three pressure ball frames 24. The positioning restriction of the three pressure ball frames 24 forces the detection push rod 111 and the directional bevel gear 12 on the alignment ball 11 to be in a coaxial state.

[0063] Before the alignment ball 11 is attached to the pressure frame 24, the detection rod 111 and the directional bevel gear 12 are in a relatively vertical state due to gravity, as described in Embodiment 3. At this time, the detection rod 111 abuts against the teeth on the side of the directional bevel gear 12. As the top plane of the alignment ball 11 abuts against the pressure frame 24, it forces the detection rod 111 to move along the tooth spacing of the directional bevel gear 12 to the bottom of the directional bevel gear 12. During this process, the detection rod 111 will continuously push the directional bevel gear 12 upward, thereby causing the directional bevel gear 12 to drive the magnetic stop rod 22 upward. At this time, the alignment ball 11 is pushed upward by the liquid control piston 25 and also moves upward a certain distance. This distance is the distance between the top plane of the liquid control piston 25 and the alignment ball 11. This results in an increase in the distance that the detection rod 111 pushes the directional bevel gear 12 upward. Figure 4 It can be seen that the leveling base 2 has a limiting groove 21 located above the detection switch 20 on its inner side. When the top plane of the alignment ball 11 is completely in contact with the ball pressing frame 24, the detection push rod 111 pushes the directional bevel gear 12, causing the magnetic stop rod 22 to abut against the limiting groove 21. Thus, the limitation between the magnetic stop rod 22 and the limiting groove 21 forces the directional bevel gear 12 to not move downward. At this time, the bottom of the directional bevel gear 12 is exactly against the bottom of the limiting frame 18.

[0064] Subsequently, as the pressure spring 261 and the hydraulic spring 260 push the hydraulic piston 26 upwards, when the hydraulic piston 26 moves away from the pressure spring 261, the elastic force of the hydraulic spring 260 is insufficient to compress the reset spring 250. At this time, with the reset spring 250 pushing the control piston 25, the control piston 25 releases its pushing action on the bottom of the alignment ball 11, and the alignment ball 11 moves downwards and away from the ball-pressing frame 24. Finally, the alignment ball 11 reattaches to the leveling base 2 and connects / disconnects the corresponding drainage channel 201. Autonomous horizontal alignment is then performed according to the description in Example 1.

[0065] Finally, after the supporting body 1 is horizontally aligned, the carpenter presses down on the detection light 8, causing the detection light 8 to push the detection intermediate rod 13 to continue moving downward. Although the anti-reverse top seat 19 extends to the end area of ​​the starting rod 14, the end of the anti-reverse top seat 19 is smaller than the end of the starting rod 14. Therefore, the anti-reverse top seat 19 can move downward along the end of the starting rod 14 to a certain extent. When the detection intermediate rod 13 pushes the limiting frame 18 downward, the bottom of the limiting frame 18 presses the directional bevel gear 12 downward, eventually causing the magnetic rod 22 on the directional bevel gear 12 to disengage from the limiting groove 21. After that, the directional bevel gear 12 moves downward under its own weight.

[0066] If the supporting body 1 is in a relatively horizontal state at this time, the detection rod 111 and the directional bevel gear 12 are coaxial. As the directional bevel gear 12 moves downward, the magnetic stop rod 22 will eventually stop at the detection switch 20. The detection switch 20 is pressed, causing the detection lamp 8 to light up, indicating that the supporting body 1 is properly leveled. After that, the carpenter can adjust the horizontal position of the laser projection unit 9 and start working again. Similarly, if the detection lamp 8 does not light up after being pressed, it means that the magnetic stop rod 22 is not in the position that presses the detection switch 20, that is, the detection rod 111 and the directional bevel gear 12 are not vertically aligned. This indicates that the supporting body 1 is not adjusted to a horizontal state and needs to be adjusted again.

Claims

1. A level for use in woodworking operations, characterized in that, Include: The bearing body (1) is provided with a laser projection unit (9) for projecting horizontal and vertical lines on the side and top, and a leveling base (2) for horizontal adjustment is installed at the bottom, and a liquid medium is installed inside the leveling base (2); The support leg shaft (3) is installed at the bottom of the leveling base (2), the top of the support leg shaft (3) is provided with a synchronous wheel (17), the synchronous wheels (17) are drivingly connected by a synchronous belt (170), the bottom of the support leg shaft (3) is fixedly provided with a support leg arm (4), and the end of the support leg arm (4) is fixedly connected with a support cylinder frame (5), and the inside of the support leg shaft (3) is provided with a middle liquid delivery channel (300), and the middle of the leveling base (2) is provided with a liquid discharge channel (201) communicated with the middle liquid delivery channel (300); The liquid pressure piston (26) is sleeved in the inside of the support cylinder frame (5), the top end of the liquid pressure piston (26) is fixedly provided with a reset pressure rod (6), the bottom is fixedly provided with a positioning leg (7), and the bottom of the liquid pressure piston (26) and the inside bottom of the support cylinder frame (5) are connected with a liquid pressure spring (260); The alignment ball (11) is movably installed in the middle of the leveling base (2), and the bottom of the alignment ball (11) is provided with a counterweight ball (110), and the middle of the leveling base (2) is fixedly connected with a ball pressing frame (24) limiting the alignment ball (11); The liquid pressure cavity (500) is formed by the inside of the support cylinder frame (5) and the top of the liquid pressure piston (26), and is communicated with the middle liquid delivery channel (300); The middle of the leveling base (2) is provided with a liquid inlet channel (200), and the liquid inlet channel (200) is used for communication between the inner cavity of the leveling base (2) and the middle liquid delivery channel (300), and a one-way flow interception mechanism is arranged in the inside of the leveling base (2) and in the liquid inlet channel (200), so that the medium in the inside of the leveling base (2) flows to the liquid inlet channel (200) in one way.

2. The level for woodworking operations according to claim 1, characterized in that, The bottom of the leveling base (2) is provided with a limit hole (10).

3. The level for woodworking construction according to claim 1, characterized in that The liquid discharge channel (201) is a cylindrical small-diameter liquid delivery channel.

4. The level for woodworking construction according to claim 1, characterized in that, The inside of the leveling base (2) is movably provided with a directional bevel gear (12), the shaft side of the directional bevel gear (12) is movably provided with a magnetic blocking rod (22), and the magnetic blocking rod (22) and the directional bevel gear (12) are connected with a top rod spring (220); The top of the directional bevel gear (12) is provided with a detection middle rod (13), and the top of the detection middle rod (13) is fixedly connected with a detection lamp (8), and the inside of the leveling base (2) is fixedly provided with a detection switch (20); The top of the alignment ball (11) is fixedly provided with a detection top rod (111); The detection switch (20), the power supply and the detection lamp (8) are connected in series.

5. The level for use in woodworking operations according to claim 4, characterized in that The inside of the leveling base (2) is movably provided with a starting rod (14), and the inside of the leveling base (2) is fixedly provided with a starting switch (140) on one side of the starting rod (14); The bottom of the detection middle rod (13) is fixedly connected with a limit frame (18), and the limit frame (18) and the leveling base (2) are connected with a limit spring (180). A reverse top preventing seat (19) is movably installed in the limiting frame (18), and is pushed against the stepped surface on the inner side of the leveling base (2) under the elastic pushing of a reverse pushing spring (190), and the stepped surfaces in the leveling base (2) are connected by a slope.

6. A spirit level for use in woodworking operations according to claim 5, characterised in that A rectangular recess is formed in the middle of the reverse top preventing seat (19), and a protrusion is arranged on the inner top of the rotating shaft of the directional bevel gear (12) to cooperate with the recess.

7. The level for woodworking operations according to claim 5, characterized in that, A magnetic block (23) is fixed to the inner top of the rotating shaft of the directional bevel gear (12).

8. The level for woodworking construction according to claim 5, characterized in that A limiting screw (16) is coaxially fixed to the top of the supporting leg shaft (3), and a reset inclined seat (15) is threadedly connected to the outer side of the limiting screw (16) and located below the end of the starting lever (14).

9. A spirit level for use in woodworking operations according to claim 8, characterised in that The first one-way flow cutting mechanism comprises: A liquid control piston (25) is movably installed in the liquid inlet channel (200) and located on one side of the alignment ball (11); A reset pushing spring (250) is fixed to the inner side of the leveling base (2); A pressure increasing spring (261) is fixed to the inner bottom of the supporting cylinder frame (5); A limiting groove (21) is formed in the inner side of the leveling base (2) and located above the detection switch (20).

10. The level for woodworking construction according to claim 1, characterized in that, The second one-way flow cutting mechanism is a one-way valve.

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