Integral lock shut-off drain ball valve

Abstract

The utility model provides a kind of integrated lock closing decontamination ball valve, belong to valve manufacturing technical field.It solves the existing lock closing valve, decontamination valve single installation and so on problem.This integrated lock closing decontamination ball valve includes valve body, the partition seat that its inner cavity is separated into left chamber and right chamber is provided in valve body, two-way ball core is equipped in left chamber, V-shaped ball core is equipped in right chamber, V-shaped ball core is connected with valve stem two, valve body is equipped with the lock closing core that the outer end of valve stem two is closed, lock closing core is realized by corresponding lock closing handle to open and close, valve body is further provided with filter cavity at the place below partition seat and left chamber and right chamber are connected, filter cavity is equipped with filter screen in the form of barrel.The utility model has the advantages of compact structure, few leakage points etc.

Description

Technical Field

[0001] This utility model belongs to the field of valve manufacturing technology, and specifically relates to an integrated locking and cleaning ball valve. Background Technology

[0002] Currently, piping systems are generally equipped with sludge removal valves and shut-off valves. Sludge removal valves serve to filter and remove impurities, preventing blockages in the pipeline and ensuring clean water output. Shut-off valves, once closed, cannot be arbitrarily opened without tampering, allowing for control over the flow of liquid in the pipeline and effective control over heating and water supply.

[0003] However, both the drain valve and the shut-off valve are installed individually, which is inconvenient to install, has many potential leaks, and requires a lot of maintenance. In addition, the shut-off valve has a two-way ball valve core, which cannot achieve precise control of the medium flow. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing an integrated locking and cleaning ball valve with a compact structure, few leaks, and both cleaning and locking functions.

[0005] The objective of this utility model can be achieved through the following technical solution: An integrated locking and cleaning ball valve, comprising a valve body, characterized in that the valve body has a partition seat dividing its inner cavity into a left chamber and a right chamber; a two-way ball core is provided in the left chamber, and the two-way ball core is connected to a valve stem extending out of the valve body; a handle is fixedly connected to the outer end of the valve stem; a V-shaped ball core is provided in the right chamber, and the V-shaped ball core is connected to a valve stem parallel to the valve stem, the valve stem extending out of the valve body in the same direction as the valve stem. The valve body is provided with a locking core that closes the two outer ends of the valve stem. The locking core is opened and closed by a corresponding locking handle. The valve body also has a filter chamber located below the partition seat and connecting the left chamber and the right chamber. The filter chamber is provided with a cylindrical filter screen. The upper end of the filter screen abuts against the partition seat and the valve body to surround the communication port between the right chamber and the filter chamber. The body of the filter screen blocks the communication port between the left chamber and the filter screen. The lower end of the filter screen is supported by a plug cap that is threaded to the valve body.

[0006] In the aforementioned integrated locking and cleaning ball valve, the inner end of the V-shaped ball core facing the partition seat has a circular hole, and the outer end of the V-shaped ball core connected to the circular hole has a V-shaped groove. The tip and the outwardly expanding end of the groove both have outwardly convex arc-shaped sections, and both sides of the groove are inwardly concave arc-shaped sections.

[0007] In the aforementioned integrated locking and cleaning ball valve, the filter screen is inclined, and the angle between the axis of the filter screen and the axis of the right chamber is 135°.

[0008] In the aforementioned integrated locking and cleaning ball valve, the outer wall of the two outer ends of the valve stem has a limiting surface extending to its top, the inner wall of the valve body where the locking core is installed has a radially convex ring, the locking core has a steel ball for abutting the bottom of the ring, one end of the locking handle has a linkage mechanism that allows the steel ball to retract into the locking core so that the locking core can disengage from the valve body, and the other end of the locking handle has a blind hole adapted to the two outer ends of the valve stem.

[0009] In the aforementioned integrated locking and cleaning ball valve, the locking core includes a lock body, a housing, a spring, a magnet, and a lock cylinder. The lock body is cylindrical with a closed top and an open bottom. The housing closes the bottom of the lock body, and its cylindrical outer wall covers the outer wall of the lock body, with the opening of the outer wall riveted to the lock body. The outer wall of the lock body is embedded with circumferentially distributed steel balls. The outer wall of the housing has radial holes for the steel balls to protrude outwards. The lock cylinder is located inside the lock body, and its outer wall has grooves corresponding to the positions of the steel balls. The top of the lock cylinder is embedded with... The lock body has a columnar protrusion at the center of its top wall, with a circumferentially distributed magnet. A spring is fitted onto the columnar protrusion. The lock cylinder has a blind hole for inserting the spring. The spring provides elastic force to keep the bottom of the lock cylinder in contact with the outer shell and to keep the outer wall of the lock cylinder in contact with the steel ball so that the steel ball protrudes out of the outer shell. The elastic force of the spring also keeps the groove of the lock cylinder located below the inner side of the corresponding steel ball. The linkage mechanism includes a second magnet embedded at one end of the locking handle, which is magnetically attracted to the first magnet. The magnetic force between the first magnet and the second magnet is greater than the elastic force of the first spring.

[0010] In another scenario, in the aforementioned integrated locking and cleaning ball valve, the locking core includes a second lock body, a second lock cylinder, a second spring, a lock cover, and a second outer shell. The second lock body is cylindrical with an inwardly folded-out flange at the top. The lock cover is located within the ring formed by the flange, and its outer wall has a step for abutting the lower edge of the flange. The second outer shell is cylindrical, its outer wall covering the outer wall of the second lock body, and the opening of the outer wall of the second outer shell is riveted to the second lock body. The outer wall of the second lock body is embedded with circumferentially distributed steel balls. The outer surface of the second outer shell has radial holes for the steel balls to protrude outwards. The second lock cylinder is located inside the second lock body. The outer wall of the second lock cylinder is used to abut against the steel ball, and the outer wall of the second lock cylinder has a groove corresponding to the position of the steel ball. The second lock cylinder is cylindrical so that the second spring can be axially inserted. The inner wall of the second lock cylinder has a vertical groove that extends axially to its top. The lock cover also has a cylindrical part inserted into the second lock cylinder. The upper end of the second spring is located in the cylindrical part, and the lower end of the second spring abuts against the second outer shell. The second spring provides elastic force so that the step of the lock cover always tends to abut against the lower edge of the stop. The linkage mechanism includes an insertion end at one end of the locking handle. The outer wall of the insertion end has a radially outward protruding rod. The top of the lock body has a slot for the protruding rod to pass through.

[0011] Compared with existing technologies, this integrated locking and cleaning ball valve has both locking and cleaning functions, and is integrated into a single valve body, resulting in fewer leakage points, a compact structure, and convenient installation. In addition, the valve body can be quickly controlled by the handle, valve stem, and two-way ball core, making it easy to operate. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the integrated locking and cleaning ball valve.

[0013] Figure 2 This is a three-dimensional structural diagram of the V-shaped ball core in this integrated locking and cleaning ball valve.

[0014] Figure 3 This is an exploded view of the locking core in the integrated locking and cleaning ball valve.

[0015] Figure 4 This is a cross-sectional view of the locking core in this integrated locking and cleaning ball valve.

[0016] Figure 5 This is a three-dimensional structural diagram of the locking core and locking handle in embodiment 2 of the integrated locking and cleaning ball valve.

[0017] Figure 6 This is a cross-sectional view of the locking core in the integrated locking and cleaning ball valve in Embodiment 2.

[0018] Figure 7 yes Figure 6 Structural cross-sectional view of section AA in the middle.

[0019] In the diagram: 1. Valve body; 2. Left chamber; 3. Right chamber; 4. Divider seat; 5. Two-way ball core; 6. Valve stem one; 7. Handle; 8. V-shaped ball core; 81. Round hole; 9. Valve stem two; 91. Limiting surface; 10. Locking core; 11. Locking handle; 111. Blind hole; 112. Insertion end; 12. Filter screen; 13. Plug cap; 14. Raised ring; 15. Steel ball; 16. Lock body one; 17. Outer shell one; 18. Spring one; 19. Magnet one; 20. Lock cylinder one; 21. Magnet two; 22. Lock body two; 221. Side guard; 23. Lock cylinder two; 231. Vertical groove; 24. Spring two; 25. Lock cover; 251. Step; 26. Outer shell two; 27. Raised rod. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this integrated locking ball valve includes a valve body 1. The valve body 1 has a partition seat 4 that divides its internal cavity into a left chamber 2 and a right chamber 3. A two-way ball core 5 is provided in the left chamber 2, and a valve stem 6 extending out of the valve body 1 is connected to the two-way ball core 5. A handle 7 is fixed to the outer end of the valve stem 6. A V-shaped ball core 8 is provided in the right chamber 3, and a valve stem 9 parallel to the valve stem 6 is connected to the V-shaped ball core 8. The valve stem 9 extends out of the valve body 1 in the same direction as the valve stem 6. The valve body 1 has a locking mechanism that closes the outer end of the valve stem 9. The locking core 10 is opened and closed by the corresponding locking handle 11. The valve body 1 also has a filter chamber located below the partition seat 4 and connecting the left chamber 2 and the right chamber 3. The filter chamber is provided with a cylindrical filter screen 12. The upper end of the filter screen 12 abuts against the partition seat 4 and the valve body 1 to surround the communication port between the right chamber 3 and the filter chamber. The mesh body of the filter screen 12 blocks the communication port between the left chamber 2 and the filter screen 12. The lower end of the filter screen 12 is supported by a plug cap 13 threaded to the valve body 1.

[0022] When using this integrated locking ball valve, handle 7 drives valve stem 6 to rotate, which in turn drives the two-way ball core 5 to rotate, thus controlling the opening and closing of valve body 1. Locking handle 11 opens and closes locking core 10. After locking handle 11 opens locking core 10, locking core 10 is removed from valve body 1. Then, locking handle 11 drives valve stem 9 to rotate, which in turn drives V-shaped ball core 8 to rotate, regulating the flow rate. Because V-shaped ball core 8 has an approximately equal percentage characteristic, it can regulate the flow... The flow rate is precisely controlled. Then, the locking core 10 is reinstalled into the valve body 1 to lock the valve stem 9, improving safety. The water first enters the right chamber 3, flows through the V-shaped ball core 8, and then enters the upper end of the filter screen 12. The filter screen 12 filters impurities in the water. The filtered water flows from the screen body of the filter screen 12 to the left chamber 2, and then through the two-way ball core 5 to exit. After a period of use, the plug cap 13 can be removed to easily clean the impurities in the filter screen 12, making cleaning convenient.

[0023] This integrated locking and cleaning ball valve has locking and cleaning functions, and is integrated into a single valve body 1. It has fewer leakage points, a compact structure, and is easy to install. In addition, the valve body 1 can be quickly controlled to open and close via the handle 7, valve stem 6, and two-way ball core 5, making it easy to operate.

[0024] To elaborate further, the inner end of the V-shaped spherical core 8 facing the separator 4 has a circular hole 81, and the outer end of the V-shaped spherical core 8 connecting the circular hole 81 has a V-shaped groove. The tip and the outwardly expanding end of the groove both have outwardly convex arc-shaped sections, and both sides of the groove have inwardly concave arc-shaped sections. This structural design is reasonable, and the percentage increase or decrease of water flow is more precise and stable.

[0025] The filter screen 12 is tilted, with an angle of 135° between its axis and the axis of the right chamber 3. This reduces water flow resistance, allows water to flow smoothly into the filter screen 12, and makes it easier for impurities to settle at the bottom of the filter screen 12.

[0026] The outer wall of the outer end of the valve stem 9 has a limiting surface 91 extending to its top. The inner wall of the valve body 1 where the locking core 10 is installed has a radially convex ring 14. The locking core 10 has a steel ball 15 for abutting the bottom of the ring 14. One end of the locking handle 11 has a linkage mechanism that allows the steel ball 15 to retract into the locking core 10 so that the locking core 10 can disengage from the valve body 1. The other end of the locking handle 11 has a blind hole 111 adapted to the outer end of the valve stem 9. Normally, the steel ball 15 abuts against the bottom of the convex ring 14, preventing the locking core 10 from detaching from the valve body 1 and thus locking the valve stem 9, ensuring good safety. When opening is required, the end of the locking handle 11 with the linkage mechanism is applied to the locking core 10, causing the steel ball 15 to retract into the locking core 10. This allows the locking core 10 to detach from the valve body 1. Then, the other end of the locking handle 11 is inserted into the outer end of the valve stem 9. Rotating the locking handle 11 causes the valve stem 9 to rotate, thereby adjusting the flow rate. After adjustment, the locking core 10 is reinstalled into the valve body 1, and the steel ball 15 again abuts against the bottom of the convex ring 14, locking the valve stem 9.

[0027] In this embodiment, the locking core 10 includes a lock body 16, a housing 17, a spring 18, a magnet 19, and a lock cylinder 20. The lock body 16 is cylindrical with a closed top and an open bottom. The housing 17 closes the bottom of the lock body 16. The outer wall of the housing 17 is cylindrical and covers the outer wall of the lock body 16, with the opening of the outer wall of the housing 17 riveted to the lock body 16. The outer wall of the lock body 16 is embedded with circumferentially distributed steel balls 15. The outer wall of the housing 17 has radial holes for the steel balls 15 to partially protrude outward. The lock cylinder 20 is located inside the lock body 16, and the outer wall of the lock cylinder 20 has grooves corresponding to the positions of the steel balls 15. The top of the lock cylinder 20 is embedded with circumferentially distributed magnets. 19. The top wall of the lock body 16 has a columnar protrusion at its center. The spring 18 is fitted onto the columnar protrusion. The lock cylinder 20 has a blind hole for the spring 18 to be inserted. The spring 18 provides elastic force so that the bottom of the lock cylinder 20 tends to abut against the outer shell 17 and the outer wall of the lock cylinder 20 abuts against the steel ball 15 so that the steel ball 15 tends to protrude from the outer shell 17. The elastic force of the spring 18 also makes the groove of the lock cylinder 20 located below the inner side of the corresponding steel ball 15. The linkage mechanism includes a magnet 21 embedded at one end of the locking handle 11 that is magnetically attracted to the magnet 19. The magnetic force between the magnet 19 and the magnet 21 is greater than the elastic force of the spring 18.

[0028] When locked, the spring force of spring 18 causes the groove of lock cylinder 20 to be lower than that of steel ball 15. The outer wall of lock cylinder 20 abuts against steel ball 15, preventing steel ball 15 from moving inward. The part of steel ball 15 protruding from outer shell 17 abuts against the bottom of convex ring 14, and lock body 16 locks the valve body 1 opening at the outer end of valve stem 9. When flow adjustment is required, the end of locking handle 11 with magnet 21 is brought close to lock body 16. Magnet 21 and magnet 19 attract each other, and the magnetic force is greater than the spring force of spring 18, causing lock cylinder 20 to rise. Locking handle 11 drives locking cylinder 10. The convex ring 14 moves upward, abutting against each steel ball 15, causing each steel ball 15 to retract and slide into the corresponding groove, thereby causing the locking core 10 to disengage from the valve body 1. Then, the other end of the locking handle 11 is inserted into the valve body 1, driving the valve stem 9 to rotate to adjust the flow rate. After adjusting the flow rate, the locking handle 11 attracts the locking core 10, allowing the locking core 10 to be reinstalled into the valve body 1. Then, the edge of the lock body 16 is pressed, causing the locking handle 11 to disengage from the locking core 10. The elastic force of the spring 18 causes the locking core 20 to move downward again, and the steel ball 15 abuts against the bottom of the convex ring 14 again, and the locking core 10 once again performs the locking function. Example 2

[0029] like Figure 5 , Figure 6 and Figure 7 As shown, this embodiment is basically the same in structure and principle as embodiment 1. The difference is that in this embodiment, the locking cylinder 10 includes a second lock body 22, a second lock cylinder 23, a second spring 24, a lock cover 25, and a second outer shell 26. The second lock body 22 is cylindrical and has an inwardly folded flange 221 at the top. The lock cover 25 is located in the circle formed by the flange 221, and the outer wall of the lock cover 25 has a step 251 for abutting the lower edge of the flange 221. The outer shell 26 is cylindrical and its outer wall covers the outer wall of the second lock body 22, and the opening of the outer wall of the second outer shell 26 is riveted to the second lock body 22. The outer wall of the second lock body 22 is embedded with circumferentially distributed steel balls 15. The outer surface of the second outer shell 26 has radial holes for the steel balls 15 to partially protrude outward. The second lock cylinder 23 is located in the second lock body 22. 2. The outer wall of the second lock cylinder 23 is used to abut against the steel ball 15 and the outer wall of the second lock cylinder 23 has a groove corresponding to the position of the steel ball 15. The second lock cylinder 23 is cylindrical so that the second spring 24 can be axially inserted. The inner wall of the second lock cylinder 23 has a vertical groove 231 that extends axially to its top. The lock cover 25 also has a cylindrical part inserted into the second lock cylinder 23. The upper end of the second spring 24 is located in the cylindrical part, and the lower end of the second spring 24 abuts against the outer shell 26. The second spring 24 provides elastic force so that the step 251 of the lock cover 25 always maintains the tendency to abut against the lower edge of the stop 221. The linkage mechanism includes a locking handle 11 with an insertion end 112 at one end. The outer wall of the insertion end 112 has a radially outward protruding protrusion 27. The top of the lock body has a slot for the protrusion 27 to pass through.

[0030] When locked, the elastic force provided by spring 24 causes step 251 to abut against the lower edge of stop 221, so that lock cover 25 closes the ring of stop 221. The outer wall of lock cylinder 23 abuts against steel ball 15, preventing steel ball 15 from moving inward. The part of steel ball 15 protruding from outer shell 26 abuts against the bottom of convex ring 14. Lock body 22 and lock cover 25 lock the valve body 1 opening at the outer end of valve stem 29. When flow adjustment is required, insert end 112 of locking handle 11 abuts against lock cover 25 and overcomes the elastic force of spring 24, pressing lock cover 25 down. The protrusion slides into vertical groove 231. Then, rotating locking handle 11 causes lock cylinder 23 to rotate until steel ball 15... 5 is located in the corresponding groove. Then, pull the locking handle 11. The protruding rod 27 is blocked by the second lock body 22, so the locking core 10 is disengaged from the valve body 1. Then, insert the other end of the locking handle 11 into the valve body 1 and rotate the second valve stem 9 to adjust the flow rate. After adjusting the flow rate, put the locking core 10 on the locking handle 11 back into the valve body 1. Then rotate the locking handle 11. The outer wall of the second lock core 23 abuts against the steel ball 15 again. The protruding rod 27 is located at the groove. Then remove the locking handle 11. The elastic force of the second spring 24 causes the lock cover 25 to close the ring of the stop edge 221 again. The steel ball 15 abuts against the bottom of the protruding ring 14 again. The locking core 10 plays the locking role again.

[0031] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. An integrated locking and cleaning ball valve, comprising a valve body (1), characterized in that, The valve body (1) has a partition seat (4) that divides its internal cavity into a left chamber (2) and a right chamber (3). The left chamber (2) is provided with a two-way ball core (5), which is connected to a valve stem (6) extending out of the valve body (1). The outer end of the valve stem (6) is fixedly connected to a handle (7). The right chamber (3) is provided with a V-shaped ball core (8), which is connected to a valve stem (9) parallel to the valve stem (6). The direction in which the valve stem (9) extends out of the valve body (1) is consistent with that of the valve stem (6). The valve body (1) is provided with a locking mechanism that closes the outer end of the valve stem (9). The locking core (10) is opened and closed by the corresponding locking handle (11). The valve body (1) also has a filter chamber located below the partition seat (4) and connecting the left chamber (2) and the right chamber (3). The filter chamber is provided with a cylindrical filter screen (12). The upper end of the filter screen (12) abuts against the partition seat (4) and the valve body (1) to surround the communication port connecting the right chamber (3) and the filter chamber. The mesh body of the filter screen (12) blocks the communication port connecting the left chamber (2) and the filter screen (12). The lower end of the filter screen (12) is supported by a plug cap (13) threaded to the valve body (1).

2. The integrated locking and cleaning ball valve according to claim 1, characterized in that, The inner end of the V-shaped ball core (8) facing the separator (4) has a round hole (81), and the outer end of the V-shaped ball core (8) connected to the round hole (81) has a V-shaped groove. The tip and the outer expansion end of the groove have convex arc sections, and both sides of the groove have concave arc sections.

3. The integrated locking and cleaning ball valve according to claim 2, characterized in that, The filter screen (12) is tilted, and the angle between the axis of the filter screen (12) and the axis of the right chamber (3) is 135°.

4. The integrated locking and cleaning ball valve according to claim 3, characterized in that, The outer wall of the outer end of the valve stem (9) has a limiting surface (91) extending to its top. The inner wall of the valve body (1) where the locking core (10) is located has a radially convex ring (14). The locking core (10) has a steel ball (15) for abutting the bottom of the ring (14). One end of the locking handle (11) has a linkage mechanism that allows the steel ball (15) to retract into the locking core (10) so that the locking core (10) can disengage from the valve body (1). The other end of the locking handle (11) has a blind hole (111) adapted to the outer end of the valve stem (9).

5. The integrated locking and cleaning ball valve according to claim 4, characterized in that, The locking cylinder (10) includes a lock body (16), a shell (17), a spring (18), a magnet (19), and a lock cylinder (20). The lock body (16) is cylindrical with a closed top and an open bottom. The shell (17) closes the bottom of the lock body (16). The outer wall of the shell (17) is cylindrical and covers the outer wall of the lock body (16), and the opening of the outer wall of the shell (17) is riveted to the lock body (16). The outer wall of the lock body (16) is embedded with circumferentially distributed steel balls (15). The outer wall of the shell (17) has radial holes for the steel balls (15) to protrude outward. The lock cylinder (20) is located inside the lock body (16), and the outer wall of the lock cylinder (20) has grooves corresponding to the positions of the steel balls (15). The top of the lock cylinder (20) is embedded with circumferentially distributed steel balls (15). Magnet 1 (19), the top wall center of the lock body 1 (16) has a columnar protrusion, the spring 1 (18) is sleeved on the columnar protrusion, the lock cylinder 1 (20) has a blind hole for the spring 1 (18) to be inserted, the spring 1 (18) provides elastic force so that the bottom of the lock cylinder 1 (20) tends to abut against the outer shell 1 (17) and the outer wall of the lock cylinder 1 (20) abuts against the steel ball (15) so that the steel ball (15) tends to protrude out of the outer shell 1 (17), the elastic force of the spring 1 (18) also makes the groove of the lock cylinder 1 (20) located below the inner side of the corresponding steel ball (15), the linkage mechanism includes a magnet 2 (21) embedded at one end of the locking handle (11) that is magnetically attracted to magnet 1 (19), the magnetic force of magnet 1 (19) and magnet 2 (21) is greater than the elastic force of spring 1 (18).

6. The integrated locking and cleaning ball valve according to claim 4, characterized in that, The locking core (10) includes a second lock body (22), a second lock cylinder (23), a second spring (24), a lock cover (25), and a second outer shell (26). The second lock body (22) is cylindrical and has an inwardly folded flange (221) at the top. The lock cover (25) is located in the circle formed by the flange (221), and the outer wall of the lock cover (25) has a step (251) for abutting the lower edge of the flange (221). The outer shell (26) is cylindrical and its outer wall covers the outer wall of the second lock body (22), and the opening of the outer wall of the second outer shell (26) is riveted to the second lock body (22). The outer wall of the second lock body (22) is embedded with circumferentially distributed steel balls (15). The outer surface of the second outer shell (26) has radial holes for the steel balls (15) to protrude outward. The second lock cylinder (23) is located inside the second lock body (22), and the outer wall of the second lock cylinder (23) is... The outer wall of the lock cylinder (23) is provided with a groove corresponding to the position of the steel ball (15) to abut against the steel ball (15). The lock cylinder (23) is cylindrical for the spring (24) to pass through axially. The inner wall of the lock cylinder (23) has a vertical groove (231) extending axially to its top. The lock cover (25) also has a cylindrical part inserted into the lock cylinder (23). The upper end of the spring (24) is located in the cylindrical part. The lower end of the spring (24) abuts against the outer shell (26). The spring (24) provides elastic force so that the step (251) of the lock cover (25) always maintains the tendency to abut against the lower edge of the stop (221). The linkage mechanism includes a locking handle (11) with an insertion end (112) at one end. The outer wall of the insertion end (112) has a radially protruding protrusion (27). The top of the lock body has a slot for the protrusion (27) to pass through.

Images