Adjustable chuck of gas valve key

Abstract

The invention discloses an adjustable chuck of a gas valve key, which comprises a chuck mechanism used for clamping a valve rod of a gas valve, and the chuck mechanism comprises a plurality of clamping jaws; the angle adjusting assembly is used for driving the clamping jaws to move and adjusting the distribution positions of the multiple clamping jaws; and the lifting assembly is used for adjusting the dynamic opening and closing range of the clamping jaw. According to the clamping device, the clamping head mechanism is arranged to clamp the valve rods of the gas valves, and the angle adjusting assembly and the lifting assembly are arranged, so that when the clamping head mechanism faces the valve rods of the gas valves of different models, the distribution positions of clamping jaws in the clamping head mechanism and the dynamic opening and closing range of the clamping jaws can be rapidly changed according to the corresponding valve rods; by arranging the universal connecting assembly to connect the chuck mechanism and the fuel gas valve key handle, the fuel gas valve key handle can still stably drive the chuck mechanism to rotate in a complex operation environment, and the application range is further widened.

Description

Technical Field

[0001] The invention relates to the technical field of gas equipment, and in particular to an adjustable chuck of a gas valve key. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The buried valve is a safety device for gas pipeline projects. It is used to cut off, connect and regulate the gas in the pipeline. It has good control characteristics and closing and sealing performance. When a gas hazard occurs, the buried valve can be closed urgently through the valve opening and closing key to reduce leakage.

[0004] Since the shapes and opening methods of various valve models are different, and valves of the same size are manufactured by many manufacturers with size differences, operators need to bring a large number of valve opening keys for the corresponding valve models, which take up a large space, are inconvenient to carry, and cannot meet the requirements of fast and flexible operation. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned deficiencies and provide an adjustable chuck for a gas valve key, which can be compatible with multiple types of valves and is easy to carry.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: an adjustable chuck of a gas valve key, comprising:

[0007] A chuck mechanism, used for clamping a gas valve stem, the chuck mechanism comprising a plurality of clamping claws;

[0008] An angle adjustment component, used to drive the clamping jaws to move and adjust the distribution positions of multiple clamping jaws;

[0009] The lifting assembly is used to adjust the dynamic opening and closing range of the gripper jaws.

[0010] Further, the chuck mechanism includes a first sleeve, a first support that can move toward and away from the first sleeve and can rotate with the first sleeve is provided at the bottom of the first sleeve, a plurality of the clamping jaws are rotatably provided on the first support, a pull rope is provided at one end of the first support close to the first sleeve, a second support is provided on the first sleeve, a connecting rod rotatably connected to the clamping jaw is provided on the second support, and a first compression spring is provided between the first support and the first sleeve;

[0011] The clamping claw is L-shaped, and consists of a transverse section and a vertical section arranged at the bottom of the transverse section, and the two ends of the transverse section are rotatably connected to the connecting rod and the first support respectively;

[0012] The end of the pull rope away from the first support is connected to the traction mechanism for retracting and releasing the pull rope.

[0013] Furthermore, a second compression spring is arranged between the plurality of the clamping jaws and the first sleeve, and the second compression spring is located between the connecting rod and the first support.

[0014] Furthermore, the number of the clamping jaws and the connecting rods is multiple and all are integer multiples of two, two adjacent clamping jaws and two connecting rods corresponding to the clamping jaws form a group of clamping assemblies, at least two groups of clamping assemblies are arranged on the chuck mechanism, and the first support and the second support are both provided with multiple angle adjustment assemblies corresponding to the multiple groups of clamping assemblies;

[0015] The angle adjustment assembly includes two side plates, an arc track is arranged between the two side plates, one of the clamping jaws and one of the corresponding connecting rods of each group of the clamping assembly are respectively rotatably connected to the arc track on the corresponding angle adjustment assembly, and can reciprocate along the arc track toward the other clamping jaw and the other connecting rod.

[0016] Furthermore, a first motor is arranged on the connecting rod rotatably arranged on the arc track, a first gear is arranged at the output end of the first motor, and an external tooth groove meshing with the first gear is opened on the arc track corresponding to the second support.

[0017] Furthermore, the second support is slidably sleeved on the first sleeve, and the lifting assembly is arranged on the first sleeve to drive the second support to move up and down;

[0018] The lifting assembly comprises a first screw sleeve rotatably arranged on the top of the second support, the second support moves synchronously with the up and down movement of the first screw sleeve, and the first sleeve is provided with an external thread groove matched with the first screw sleeve.

[0019] Furthermore, the lifting assembly also includes a second motor arranged in the first sleeve, and the output end of the second motor is provided with a second gear passing through the first sleeve. The first screw sleeve is vertically provided with an internal tooth groove meshing with the second gear, and the length of the internal tooth groove is not less than the distance that the first screw sleeve can move up and down.

[0020] Furthermore, a universal connection assembly is provided between the chuck mechanism and the gas valve key handle, for maintaining torque transmission when the chuck mechanism is deflected.

[0021] Further, the universal connection assembly includes a second sleeve connected to the gas valve key handle, a third sleeve plugged into the second sleeve and capable of moving up and down is provided at the bottom of the second sleeve, the bottom of the third sleeve is connected to the first sleeve, the internal aperture of the second sleeve is larger than the outer diameter of the third sleeve, a latch that passes through the second sleeve transversely is provided on the third sleeve, a strip hole for the latch to move up and down is provided on the second sleeve, two L-shaped top blocks for pushing the third sleeve to rotate and deflect around the latch are rotatably provided on the third sleeve, the two L-shaped top blocks are mirror-symmetrical about the axis of the second sleeve, a second screw sleeve is rotatably provided on the second sleeve, an external thread groove that matches the second screw sleeve is provided on the second sleeve, a top ring that can move up and down with the second screw sleeve is rotatably provided at the bottom end of the second screw sleeve, the maximum spacing between the top ends of the two L-shaped top blocks is not less than the outer diameter of the top ring, at least one groove for avoiding the L-shaped top block is provided at the bottom end of the top ring, and the top ring is an inverted cone-shaped;

[0022] One end of the L-shaped top block is inclined upward and away from the second sleeve, and the other end of the L-shaped top block is inclined downward and close to the third sleeve and abuts against the third sleeve. The rotation center of the L-shaped top block is located in the middle. When the top ring moves downward, it can enter the gap between the L-shaped top block and the second sleeve and squeeze the top of the L-shaped top block, so that when one of the L-shaped top blocks is in the groove, the other L-shaped top block abuts against the third sleeve and pushes the third sleeve to deflect to one side.

[0023] Furthermore, a convex block opposite to the groove is also provided at the bottom end of the top ring, and when the convex block moves downward, it can enter the gap between the L-shaped top block and the second sleeve and squeeze the top of the L-shaped top block.

[0024] The beneficial effects of the present invention are embodied in:

[0025] The present invention provides a chuck mechanism to clamp the gas valve stem, and provides an angle adjustment component and a lifting component, so that when the chuck mechanism faces different types of gas valve stems, the distribution position of the clamping claws in the chuck mechanism and the dynamic opening and closing range of the clamping claws can be quickly changed according to the corresponding valve stems, so that as many different types of gas valve stems as possible can be adapted, and by providing a universal connection component to connect the chuck mechanism and the gas valve key handle, when facing a complex operating environment, it can still be ensured that the gas valve key handle can stably drive the chuck mechanism to rotate, thereby further improving the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional view of the present invention;

[0027] Figure 2 It is a partial view of the chuck mechanism of the present invention;

[0028] Figure 3 It is a partial cross-sectional view of the chuck mechanism of the present invention;

[0029] Figure 4 It is a partial view of the lifting assembly of the present invention;

[0030] Figure 5 It is a three-dimensional view of the universal connection assembly of the present invention.

[0031] In the figure:

[0032] 1. chuck mechanism; 11. first sleeve; 12. first support; 13. clamping claw; 14. pull rope; 15. second support; 16. connecting rod; 17. first compression spring; 18. second compression spring;

[0033] 2. Angle adjustment assembly; 21. Side panel; 22. Arc track; 23. First motor;

[0034] 3. Lifting assembly; 31. First screw sleeve; 32. Second motor;

[0035] 4. Universal connection assembly; 41. Second sleeve; 42. Third sleeve; 43. Latch; 44. L-shaped top block; 45. Second screw sleeve; 46. Top ring; 47. Protrusion. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-5 The present invention discloses an adjustable chuck of a gas valve key, comprising:

[0038] A clamping mechanism 1 is used for clamping a gas valve stem, and the clamping mechanism 1 comprises a plurality of clamping claws 13;

[0039] An angle adjustment component 2, used for driving the clamping jaws 13 to move and adjusting the distribution positions of the multiple clamping jaws 13;

[0040] A lifting assembly 3, used to adjust the dynamic opening and closing range of the clamping jaws 13;

[0041] The universal connection assembly 4 has one end connected to the chuck mechanism 1 and the other end connected to the gas valve key handle, and is used to maintain torque transmission when the chuck mechanism 1 is deflected.

[0042] The present invention provides a chuck mechanism 1 for clamping the gas valve stem, and provides an angle adjustment component 2 and a lifting component 3, so that when the chuck mechanism 1 faces different types of gas valve stems, the distribution position of the clamping jaws 13 in the chuck mechanism 1 and the dynamic opening and closing range of the clamping jaws 13 can be quickly changed according to the corresponding valve stems, so that as many different types of gas valve stems as possible can be adapted. By providing a universal connection component 4 to connect the chuck mechanism 1 and the gas valve key handle, when facing a complex operating environment, it can still be ensured that the gas valve key handle can stably drive the chuck mechanism 1 to rotate, thereby further improving the scope of application.

[0043] In one embodiment, the chuck mechanism 1 includes a first sleeve 11, one end of the first sleeve 11 is connected to the universal connection assembly 4, the other end of the first sleeve 11 is provided with a first support 12 that can move toward and away from the first sleeve 11 and can rotate with the first sleeve 11, a plurality of clamping jaws 13 are rotatably arranged on the first support 12, a pull rope 14 is arranged at one end of the first support 12 close to the first sleeve 11, a second support 15 is sleeved on the first sleeve 11, a connecting rod 16 rotatably connected to the clamping jaw 13 is arranged on the second support 15, a first compression spring 17 is arranged between the first support 12 and the first sleeve 11, and a second compression spring 18 is arranged between the plurality of clamping jaws 13 and the first sleeve 11;

[0044] The clamping jaw 13 is L-shaped, and consists of a transverse section and a vertical section arranged at the bottom of the transverse section. The two ends of the transverse section are rotatably connected to the connecting rod 16 and the first support 12 respectively, and the second compression spring 18 is located between the connecting rod 16 and the first support 12;

[0045] One end of the pull rope 14 away from the first support 12 is connected to a traction mechanism for retracting and releasing the pull rope 14 .

[0046] With this design, after the chuck mechanism 1 is sleeved on the gas valve stem, the pull rope 14 is pulled up to make the clamping jaw 13 rotate to the side close to the gas valve stem under the restriction of the connecting rod 16 until the gas valve stem is clamped. At the same time, the second compression spring 18 applies a thrust to the clamping jaw 13 during the clamping process of the clamping jaw 13, which can effectively avoid the problem of the clamping jaw 13 not clamping firmly due to wear and tear over a long period of time. On the contrary, when the pull rope 14 is loosened, the first compression spring 17 pushes the first support 12 to move down and reset, driving the clamping jaw 13 to rotate in the opposite direction, loosening the gas valve stem, and then the chuck mechanism 1 can be moved up to be taken out of the valve well. By controlling the stretching length of the pull rope 14, the purpose of being compatible with gas valve stems of different models and specifications is achieved, which can effectively solve the problem that the current specifications and sizes of valve opening keys are different, the number of keys carried is large, the volume is large, and the inconvenience of carrying is inconvenient.

[0047] It should be noted that the traction mechanism belongs to the mature existing technology and will not be described in detail here.

[0048] In one embodiment, the number of the clamping jaws 13 and the connecting rods 16 is multiple and all are integer multiples of two, two adjacent clamping jaws 13 and two connecting rods 16 corresponding to the clamping jaws 13 form a group of clamping components, at least two groups of clamping components are arranged on the clamping head mechanism 1, and the first support 12 and the second support 15 are both provided with multiple angle adjustment components 2 corresponding to the multiple groups of clamping components;

[0049] The angle adjustment assembly 2 includes two side plates 21, and an arc track 22 is arranged between the two side plates 21. One of the clamping jaws 13 and one of the corresponding connecting rods 16 of each group of clamping assemblies are respectively rotatably connected to the arc track 22 on the corresponding angle adjustment assembly 2, and can reciprocate along the arc track 22 toward the other clamping jaw 13 and the other connecting rod 16. Another clamping jaw 13 and another corresponding connecting rod 16 of each group of clamping assemblies are respectively rotatably connected to one of the side plates 21 on the corresponding angle adjustment assembly 2. A first motor 23 is arranged on the connecting rod 16 rotatably arranged on the arc track 22, and a first gear is arranged at the output end of the first motor 23. An external tooth groove meshing with the first gear is opened on the arc track 22 corresponding to the second support 15.

[0050] With this design, the first motor 23 can be started to drive the first gear to move on the arc track 22 with external tooth grooves, or it can be manually pushed to drive the clamping jaws 13 and the connecting rod 16 connected thereto to move along the arc track 22, thereby changing the horizontal angle between the two clamping jaws 13 in the same group, and further improving the compatibility of the chuck mechanism 1 with different gas valve stems.

[0051] In one embodiment, the second support 15 is slidably sleeved on the first sleeve 11, and the lifting assembly 3 is disposed on the first sleeve 11 to drive the second support 15 to move up and down;

[0052] The lifting assembly 3 includes a first screw sleeve 31 rotatably arranged on the top of the second support 15, and the second support 15 moves synchronously with the up and down movement of the first screw sleeve 31. The first sleeve 11 is provided with an external thread groove adapted to the first screw sleeve 31. The lifting assembly 3 also includes a second motor 32 arranged in the first sleeve 11, and the output end of the second motor 32 is provided with a second gear passing through the first sleeve 11. The first screw sleeve 31 is vertically provided with an internal tooth groove meshing with the second gear, and the length of the internal tooth groove is not less than the distance that the first screw sleeve 31 can move up and down.

[0053] With this design, the first screw sleeve 31 is rotated to drive the second support 15 to move up and down, thereby changing the initial position of the connecting rod 16 and the initial angle of the clamping jaw 13, effectively increasing the clamping range of the clamping jaw 13, and further improving the compatibility of the chuck mechanism 1 with different gas valve stems. At the same time, due to the setting of the second motor 32 and the second gear, the first screw sleeve 31 can also be driven to rotate by the second motor 32 to meet different usage requirements.

[0054] In one embodiment, the universal connection assembly 4 includes a second sleeve 41 connected to the handle of the gas valve key, a third sleeve 42 is provided at the bottom of the second sleeve 41 and is inserted into the second sleeve 41 and can move up and down, the bottom of the third sleeve 42 is connected to the first sleeve 11, the internal aperture of the second sleeve 41 is larger than the outer diameter of the third sleeve 42, the third sleeve 42 is provided with a pin 43 that passes through the second sleeve 41 horizontally, the second sleeve 41 is provided with a strip hole for the pin 43 to move up and down, and the third sleeve 42 is rotatably provided with two pins for pushing the third sleeve 42 to rotate around The latch 43 is rotatably offset by an L-shaped top block 44, and the two L-shaped top blocks 44 are mirror-symmetrical about the axis of the second sleeve 41. A second screw sleeve 45 is rotatably provided on the second sleeve 41, and an external thread groove matching the second screw sleeve 45 is provided on the second sleeve 41. A top ring 46 capable of moving up and down with the second screw sleeve 45 is rotatably provided at the bottom end of the second screw sleeve 45. The maximum distance between the top ends of the two L-shaped top blocks 44 is not less than the outer diameter of the top ring 46. At least one groove for avoiding the L-shaped top block 44 is provided at the bottom end of the top ring 46, and the top ring 46 is in the shape of an inverted cone.

[0055] One end of the L-shaped top block 44 is inclined upward and away from the second sleeve 41, and the other end of the L-shaped top block 44 is inclined downward and close to the third sleeve 42 and abuts against the third sleeve 42. The rotation center of the L-shaped top block 44 is located in the middle. When the top ring 46 moves downward, it can enter the gap between the L-shaped top block 44 and the second sleeve 41 and squeeze the top of the L-shaped top block 44, so that when one of the L-shaped top blocks 44 is in the groove, the other L-shaped top block 44 abuts against the third sleeve 42 and pushes the third sleeve 42 to deflect to one side.

[0056] In this design, the top ring 46 is rotated to adjust the groove not to be directly above the L-shaped top block 44, and then the second screw sleeve 45 is rotated to drive the top ring 46 to move down and abut against the L-shaped top block 44. The L-shaped top block 44 is pushed and rotated to limit the rotation margin of the third sleeve 42 in the second sleeve 41, so that in this state, the gas valve key handle and the chuck mechanism 1 are in the same straight line, which can meet the normal clamping and rotation requirements; secondly, the top ring 46 is rotated to adjust the groove to be directly above the L-shaped top block 44, and then the second screw sleeve 45 is rotated to make one of the L-shaped top blocks 44 move into the groove and the other L The top block 44 is pushed by the top ring 46 to squeeze the third sleeve 42, so that the third sleeve 42 rotates to the other side, so that in this state, the gas valve key handle is not in the same straight line with the chuck mechanism 1, which can meet the clamping requirements of a narrow environment; secondly, by rotating the second screw sleeve 45, the second screw sleeve 45 is in the upper limit position, at this time, the chuck mechanism 1 is connected to the gas valve stem, so that when the chuck mechanism 1 and the gas valve key handle are at a deflection angle, the chuck mechanism 1 can still be driven to rotate by the rotation of the gas valve key handle under the cooperation of the third sleeve 42, the strip hole and the pin 43.

[0057] It should be noted that when the actuator is used, the positions of the top ring 46 and the second screw sleeve 45 need to be manually adjusted in advance according to the use environment.

[0058] In one embodiment, a protrusion 47 opposite to the groove is further provided at the bottom end of the top ring 46 . When the protrusion 47 moves downward, it can enter the gap between the L-shaped top block 44 and the second sleeve 41 and squeeze the top of the L-shaped top block 44 .

[0059] Such a design enables one of the L-shaped top blocks 44 to move into the groove while the other L-shaped top block 44 is pushed by the protrusion 47, which can accelerate the L-shaped top block 44 to push the third sleeve 42 to deflect, thereby reducing the height that the top ring 46 needs to move downward.

[0060] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0062] In addition, "plurality" means two or more.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable chuck for a gas valve key, characterized in that: include: A clamping mechanism (1) for clamping a gas valve stem, the clamping mechanism (1) comprising a plurality of clamping claws (13); An angle adjustment component (2) is used to drive the clamping jaws (13) to move and adjust the distribution positions of the plurality of clamping jaws (13); The lifting assembly (3) is used to adjust the dynamic opening and closing range of the clamping jaws (13).

2. The adjustable chuck of the gas valve key according to claim 1, characterized in that: The chuck mechanism (1) comprises a first sleeve (11), the bottom of the first sleeve (11) is provided with a first support (12) which can move towards and away from the first sleeve (11) and can rotate with the first sleeve (11), a plurality of clamping jaws (13) are rotatably arranged on the first support (12), a pull rope (14) is arranged at one end of the first support (12) close to the first sleeve (11), a second support (15) is arranged on the first sleeve (11), a connecting rod (16) rotatably connected to the clamping jaw (13) is arranged on the second support (15), and a first compression spring (17) is arranged between the first support (12) and the first sleeve (11); The clamping jaw (13) is L-shaped and consists of a transverse section and a vertical section arranged at the bottom of the transverse section. The two ends of the transverse section are rotatably connected to the connecting rod (16) and the first support (12) respectively. One end of the pull rope (14) away from the first support (12) is connected to a traction mechanism for retracting and releasing the pull rope (14).

3. The adjustable chuck of the gas valve key according to claim 2, characterized in that: A second compression spring (18) is arranged between the plurality of clamping jaws (13) and the first sleeve (11), and the second compression spring (18) is located between the connecting rod (16) and the first support (12).

4. The adjustable chuck of the gas valve key according to claim 2, characterized in that: The number of the clamping jaws (13) and the connecting rods (16) is multiple and all are integer multiples of two; two adjacent clamping jaws (13) and two connecting rods (16) corresponding to the clamping jaws (13) form a group of clamping components; at least two groups of clamping components are arranged on the clamping head mechanism (1); and the first support (12) and the second support (15) are both provided with multiple angle adjustment components (2) corresponding to the multiple groups of clamping components; The angle adjustment assembly (2) comprises two side plates (21), an arc track (22) is arranged between the two side plates (21), one of the clamping jaws (13) and one of the corresponding connecting rods (16) of each group of the clamping assembly are respectively rotatably connected to the arc track (22) on the corresponding angle adjustment assembly (2), and can reciprocate along the arc track (22) toward the other clamping jaw (13) and the other connecting rod (16).

5. The adjustable chuck of the gas valve key according to claim 4, characterized in that: A first motor (23) is arranged on the connecting rod (16) rotatably arranged on the arc track (22), a first gear is arranged at the output end of the first motor (23), and an external tooth groove meshing with the first gear is provided on the arc track (22) corresponding to the second support (15).

6. The adjustable chuck of the gas valve key according to claim 2, characterized in that: The second support (15) is slidably sleeved on the first sleeve (11), and the lifting assembly (3) is arranged on the first sleeve (11) to drive the second support (15) to move up and down; The lifting assembly (3) comprises a first screw sleeve (31) rotatably arranged on the top of the second support (15); the second support (15) moves synchronously with the up and down movement of the first screw sleeve (31); and the first sleeve (11) is provided with an external thread groove matched with the first screw sleeve (31).

7. The adjustable chuck of the gas valve key according to claim 6, characterized in that: The lifting assembly (3) further comprises a second motor (32) arranged in the first sleeve (11); a second gear penetrating the first sleeve (11) is arranged at the output end of the second motor (32); an internal tooth groove meshing with the second gear is vertically provided on the first screw sleeve (31); and a length dimension of the internal tooth groove is not less than a distance dimension that the first screw sleeve (31) can move up and down.

8. The adjustable chuck of the gas valve key according to claim 2, characterized in that: A universal connection assembly (4) is provided between the clamping mechanism (1) and the gas valve key handle, and is used to maintain torque transmission when the clamping mechanism (1) is deflected.

9. The adjustable chuck of the gas valve key according to claim 8, characterized in that: The universal connection assembly (4) comprises a second sleeve (41) connected to the handle of the gas valve key, a third sleeve (42) is provided at the bottom of the second sleeve (41) and is plugged into the second sleeve (41) and can move up and down, the bottom of the third sleeve (42) is connected to the first sleeve (11), the inner diameter of the second sleeve (41) is larger than the outer diameter of the third sleeve (42), the third sleeve (42) is provided with a latch (43) which passes through the second sleeve (41) transversely, the second sleeve (41) is provided with a strip hole for the latch (43) to move up and down, and the third sleeve (42) is rotatably provided with two locking members for pushing the third sleeve (42) to rotate around the latch (43) 43) an L-shaped top block (44) that is rotatably offset, the two L-shaped top blocks (44) are mirror-symmetrical about the axis of the second sleeve (41), a second screw sleeve (45) is rotatably provided on the second sleeve (41), an external thread groove that matches the second screw sleeve (45) is provided on the second sleeve (41), a top ring (46) that can move up and down with the second screw sleeve (45) is rotatably provided at the bottom end of the second screw sleeve (45), the maximum distance between the top ends of the two L-shaped top blocks (44) is not less than the outer diameter of the top ring (46), at least one groove for avoiding the L-shaped top block (44) is provided at the bottom end of the top ring (46), and the top ring (46) is in the shape of an inverted cone; One end of the L-shaped top block (44) is tilted upward and away from the second sleeve (41), and the other end of the L-shaped top block (44) is tilted downward and close to the third sleeve (42) and abuts against the third sleeve (42). The rotation center of the L-shaped top block (44) is located in the middle. When the top ring (46) moves downward, it can enter the gap between the L-shaped top block (44) and the second sleeve (41) and squeeze the top of the L-shaped top block (44), so that when one of the L-shaped top blocks (44) is in the groove, the other L-shaped top block (44) abuts against the third sleeve (42) and pushes the third sleeve (42) to deflect to one side.

10. The adjustable chuck of the gas valve key according to claim 9, characterized in that: The bottom end of the top ring (46) is also provided with a convex block (47) opposite to the groove. When the convex block (47) moves downward, it can enter the gap between the L-shaped top block (44) and the second sleeve (41) and squeeze the top of the L-shaped top block (44).

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