Locking device

Abstract

The present invention relates to the field of fixture and tooling technology, and in particular to a locking device, which includes a base, a limit block and a longitudinal clamping mechanism, wherein the limit block is fixed on the base; the base is used to support the bottom of the valve stem assembly, the limit block has a first limit portion and a second limit portion, the first limit portion is used to limit the lateral displacement and lateral deflection of the valve stem assembly; the longitudinal clamping mechanism is used to push the air intake pipe longitudinally to move the air intake pipe toward the air intake port on the valve stem assembly, and the longitudinal clamping mechanism cooperates with the second limit portion to limit the longitudinal displacement and longitudinal tilt of the valve stem assembly and the air intake pipe. The locking device provided by the present invention can limit the valve stem assembly to its preset position without any displacement or tilt in any direction, and has a good positioning effect, thereby improving the assembly quality and stability of the air intake pipe and the valve stem assembly.

Description

Technical Field

[0001] The invention relates to the technical field of fixtures and tools, and in particular to a locking device. Background Art

[0002] See also Figure 1 In the assembly process of the stove, there are steps for assembling the air intake pipe 70 and the valve stem assembly 80. Generally, the air intake pipe 70 and the valve stem assembly 80 are positioned by a clamp, and then the air intake pipe 70 and the valve stem assembly 80 are manually fastened together to realize the assembly of the air intake pipe 70 and the valve stem assembly 80.

[0003] The existing clamp for positioning the air intake pipe 70 and the valve stem assembly 80 mainly consists of a base and a longitudinal clamping mechanism. A positioning hole for positioning the valve stem assembly 80 is opened on the base, and a positioning column is set at the bottom of the valve stem assembly 80. During assembly, the positioning column of the valve stem assembly 80 is first installed in the positioning hole to achieve preliminary positioning of the valve stem assembly 80. Then, the air intake pipe 70 is placed in a position corresponding to the valve stem assembly 80. After that, the air intake pipe 70 is pressed against the longitudinal clamping mechanism. Under the restrictive effect of the positioning hole on the positioning column, the valve stem assembly 80 and the air intake pipe 70 can be in close contact, so that the air intake pipe 70 and the valve stem assembly 80 can be manually fastened together. However, in order to facilitate the installation of the valve stem assembly 80, the aperture of the positioning hole will be larger than the diameter of the positioning column. Therefore, after the longitudinal clamping mechanism presses the air intake pipe 70, the positioning column on the valve stem assembly 80 will be tilted to varying degrees relative to the positioning hole (such as Figure 1 As shown in FIG. 1 , the positioning effect is poor, resulting in poor and unstable assembly quality of the intake pipe 70 and the valve stem assembly 80 .

[0004] In summary, how to overcome the above-mentioned defects of the existing fixture for positioning the intake pipe and the valve stem assembly is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a locking device to alleviate the technical problem of poor positioning effect of the fixture for positioning the intake pipe and the valve stem assembly in the prior art.

[0006] The locking device provided by the present invention comprises a base, a limit block and a longitudinal pressing mechanism, wherein the limit block is fixed on the base;

[0007] The base is used to support the bottom of the valve stem assembly, and the limit block has a first limit portion, which is used to limit the lateral displacement and lateral deflection of the valve stem assembly; the longitudinal clamping mechanism is used to limit the longitudinal displacement and longitudinal inclination of the valve stem assembly and the intake pipe.

[0008] Preferably, as an implementation method, the first limiting portion is a first limiting groove with a notch facing upwards opened on the limiting block, the first limiting groove can accommodate the air outlet pipe on the valve stem assembly, and the groove wall of the first limiting groove can limit the lateral displacement and lateral deflection of the air outlet pipe on the valve stem assembly; the first limiting groove corresponds one-to-one to the air outlet pipe on the valve stem assembly.

[0009] Preferably, as an implementable embodiment, the first limiting groove is a groove with a semicircular cross section, the diameter of the first limiting groove is the same as the outer diameter of the corresponding air outlet pipe, and the two ends of the semicircular shape of the first limiting groove are located on the same horizontal plane;

[0010] Alternatively, the first limiting groove is a U-shaped groove, and both groove walls of the first limiting groove are used to abut against the pipe wall of the corresponding air outlet pipe.

[0011] Preferably, as an implementable embodiment, the longitudinal clamping mechanism is used to push the intake pipe in the longitudinal direction so that the intake pipe moves toward the intake port on the valve stem assembly; the limit block also has a second limit portion, which is a side wall on the limit block that is perpendicular to the clamping direction of the longitudinal clamping mechanism, and the longitudinal clamping mechanism cooperates with the second limit portion to limit the longitudinal deviation and longitudinal inclination of the valve stem assembly and the intake pipe.

[0012] Preferably, as an implementation mode, a first support block and a second support block are fixed on the base, the first support block is used to support one end of the longitudinal tube portion of the intake pipe close to the transverse tube portion, and the second support block is used to support one end of the longitudinal tube portion of the intake pipe away from the transverse tube portion.

[0013] Preferably, as an implementable embodiment, a second limiting groove with an upward notch is provided on the first support block, and the second limiting groove can accommodate the air inlet pipe;

[0014] The locking device also includes a transverse clamping mechanism, which is used to push the intake pipe in the transverse direction so that the intake pipe is pressed into the second limiting groove. The transverse clamping mechanism cooperates with the second limiting groove to limit the lateral displacement and lateral deflection of the intake pipe.

[0015] Preferably, as an implementable embodiment, the second limiting groove is an L-shaped groove with a groove wall at an acute angle, and one of the groove walls of the second limiting groove is vertically arranged;

[0016] And / or, a clamping block is provided at the working end of the transverse clamping mechanism, a third limiting groove is opened on the clamping block, the third limiting groove is an L-shaped groove with a groove opening facing downward and a groove wall at an obtuse angle, and one of the groove walls of the third limiting groove is vertically arranged.

[0017] Preferably, as an implementable embodiment, a fourth limiting groove with a notch facing upward is formed on the second support block, the fourth limiting groove can accommodate the air intake pipe, and the groove wall of the fourth limiting groove can limit the lateral displacement and lateral deflection of the air intake pipe.

[0018] Preferably, as an implementable embodiment, the fourth limiting groove is a groove with a semicircular cross section, the diameter of the fourth limiting groove is the same as the outer diameter of the air intake pipe, and both ends of the semicircular shape of the fourth limiting groove are located on the same horizontal plane;

[0019] Alternatively, the fourth limiting groove is a U-shaped groove, and both groove walls of the fourth limiting groove abut against the tube wall of the corresponding air outlet pipe.

[0020] Preferably, as an implementable embodiment, the limiting block, the first supporting block and / or the second supporting block are detachably connected to the base.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The locking device provided by the present invention is mainly composed of a base, a limit block and a longitudinal clamping mechanism, wherein the limit block is fixed on the base, and the limit block has a first limit portion. The base can support the bottom of the valve stem assembly to limit the downward freedom of the valve stem assembly; the first limit portion can limit the lateral displacement and lateral deflection of the valve stem assembly to limit the lateral (left and right) freedom of the valve stem assembly; the longitudinal clamping mechanism can limit the longitudinal displacement and longitudinal inclination of the valve stem assembly and the air intake pipe to limit the longitudinal (front and back) freedom of the valve stem assembly.

[0023] In summary, the locking device provided by the present invention can limit the freedom of the valve stem assembly in five directions (front, back, left, right, and bottom), and the self-gravity of the valve stem assembly will limit the freedom of the valve stem assembly in another direction (up), that is, the valve stem assembly can be restricted to its preset position without any deviation or tilt in any direction, and the positioning effect is good, thereby improving the assembly quality and stability of the intake pipe and the valve stem assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 An intake pipe and a valve stem assembly assembled using a fixture in the prior art;

[0026] Figure 2 An intake pipe and a valve stem assembly assembled using the locking device provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a top view of the structure of a locking device provided in an embodiment of the present invention locking an intake pipe and a valve stem assembly;

[0028] Figure 4 A right side structural schematic diagram of a locking device provided in an embodiment of the present invention locking an intake pipe and a valve stem assembly;

[0029] Figure 5 A schematic diagram of the three-dimensional structure of a locking device provided in an embodiment of the present invention locking an intake pipe and a valve stem assembly;

[0030] Figure 6 A schematic diagram of the assembly structure of the limit block and the valve stem assembly in the locking device provided for the implementation of the present invention;

[0031] Figure 7 A schematic diagram of the assembly structure of the second support block and the air intake pipe in the locking device provided in an embodiment of the present invention;

[0032] Figure 8 A schematic diagram of the assembly structure of the first support block, the pressing block and the air intake pipe in the locking device provided in an embodiment of the present invention;

[0033] Fig. 9 A schematic diagram of the three-dimensional structure of a locking device provided in an embodiment of the present invention;

[0034] Fig.10 A schematic diagram of the top view of the locking device provided in an embodiment of the present invention;

[0035] Fig.11 A schematic diagram of the rear structural view of the locking device provided in an embodiment of the present invention.

[0036] Icons: 10 - base; 20 - limit block; 30 - longitudinal clamping mechanism; 40 - first support block; 50 - second support block; 60 - transverse clamping mechanism; 70 - air intake pipe; 80 - valve stem assembly; 90 - manual valve control mechanism;

[0037] 21 - first limiting portion; 22 - second limiting portion;

[0038] 61 - compression block;

[0039] 81 - Exhaust pipe. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0044] See also Figure 3 - Figure 6 as well as Fig. 9 - Fig.11 The locking device provided in this embodiment is mainly composed of a base 10, a limit block 20 and a longitudinal clamping mechanism 30, wherein the limit block 20 is fixed on the base 10, and the limit block 20 has a first limit portion 21. The base 10 can support the bottom of the valve stem assembly 80 to limit the downward freedom of the valve stem assembly 80; the first limit portion 21 can limit the lateral displacement and lateral deflection of the valve stem assembly 80 to limit the lateral (left and right) freedom of the valve stem assembly 80; the longitudinal clamping mechanism 30 can limit the longitudinal displacement and longitudinal inclination of the valve stem assembly 80 and the air intake pipe 70 to limit the longitudinal (front and back) freedom of the valve stem assembly 80.

[0045] In summary, the locking device provided in this embodiment can limit the freedom of the valve stem assembly 80 in five directions (forward, backward, left, right, and downward), and the self-weight of the valve stem assembly 80 will limit the freedom of the valve stem assembly 80 in another direction (upward), that is, the valve stem assembly 80 can be restricted to its preset position without any deviation or tilt in any direction (such as Figure 2 As shown), the positioning effect is good; obviously, Figure 2 The assembly quality of the intake pipe 70 and the valve stem assembly 80 assembled by positioning the locking device provided in this embodiment is better than that of Figure 1 The assembly quality of the air intake pipe 70 and the valve stem assembly 80 assembled by positioning with a fixture in the prior art is high, that is, the locking device provided in this embodiment can improve the assembly quality and stability of the air intake pipe 70 and the valve stem assembly 80.

[0046] Specifically, see Figure 6 as well as Fig. 9 - Fig.11 The first limiting portion 21 is a first limiting groove with a notch facing upwards and opened on the limiting block 20. The first limiting groove can accommodate the air outlet pipe 81 on the valve stem assembly 80, and the groove wall of the first limiting groove can limit the lateral displacement and lateral deflection of the air outlet pipe 81 on the valve stem assembly 80.

[0047] It should be noted that, because the outer tube wall of the air outlet pipe 81 on the valve stem assembly 80 is a cylindrical surface, and when the air outlet pipe 81 on the valve stem assembly 80 is placed in the first limiting groove, the axial direction of the air outlet pipe 81 on the valve stem assembly 80 is the same as the clamping direction of the longitudinal clamping mechanism 30. If the air outlet pipe 81 on the valve stem assembly 80 moves longitudinally relative to the first limiting groove, the outer diameter of the portion of the air outlet pipe 81 that contacts the groove wall of a certain cross section of the first limiting groove will not change. On the one hand, when placing the valve stem assembly 80, it is only necessary to place the valve stem assembly 80 on the base 10 and place the air outlet pipe 81 on the valve stem assembly 80 in the first limiting groove. It is necessary to consider whether the valve stem assembly 80 is accurately placed in the preset position, which can improve efficiency. If the valve stem assembly 80 is not in place, then when the longitudinal clamping mechanism 30 pushes the air intake pipe 70 to move longitudinally, it will indirectly push the valve stem assembly 80 that is in contact with the air intake pipe 70 to move longitudinally, so that the valve stem assembly 80 can reach the preset position; on the other hand, it is convenient to reduce the difficulty of processing the first limit groove; in addition, because the outer surface of the air outlet pipe 81 on the valve body assembly is a smooth curved surface, the valve stem assembly 80 and the first limit portion 21 are less worn during the process of the valve body assembly being pushed by the longitudinal clamping mechanism 30, which is convenient to increase the service life of the limit block 20.

[0048] Furthermore, the first limiting grooves can be matched one-to-one with the air outlet pipes 81 on the valve stem assembly 80, so that all the air outlet pipes 81 on the valve stem assembly 80 can be limited by the first limiting grooves, thereby improving the limiting effect.

[0049] As an implementation option, see Figure 6 , Fig. 9 and Fig.11 The first limiting groove is a groove with a semicircular cross-section. The diameter of the first limiting groove is the same as the outer diameter of the corresponding air outlet pipe 81. Therefore, the first limiting groove is equivalent to the contour structure of the corresponding air outlet pipe 81, and the limiting effect is better; the two ends of the semicircular shape of the first limiting groove are located on the same horizontal plane. On the one hand, it is convenient to place the air outlet pipe 81 on the valve stem assembly 80 into the first limiting groove. On the other hand, the lateral limiting function of the first limiting groove on the air outlet pipe 81 can be fully utilized.

[0050] As another possible implementation mode, the first limiting groove can be set as a U-shaped groove, and the two groove walls of the first limiting groove are both in contact with the tube wall of the corresponding air outlet pipe 81, so as to utilize the two groove walls of the first limiting groove to limit the lateral movement and lateral deflection of the air outlet pipe 81.

[0051] It should be noted that the first limiting groove may also be set to other shapes as long as it can achieve the function of limiting the lateral movement and lateral deflection of the air outlet pipe 81.

[0052] In addition, see Figure 3 , Figure 5 and Fig. 9 The limit block 20 also has a second limit portion 22, and the longitudinal clamping mechanism 30 can also push the air inlet pipe 70 in the longitudinal direction, so that the air inlet pipe 70 moves toward the air inlet on the valve stem assembly 80 under the action of the thrust until the air inlet pipe 70 is pressed against the valve stem assembly 80. At this time, the longitudinal clamping mechanism 30 can cooperate with the second limit portion 22, so that the valve stem assembly 80 and the air inlet pipe 70 can be squeezed between the longitudinal clamping mechanism 30 and the second limit portion 22, which can not only make the valve stem assembly 80 and the air inlet pipe 70 subject to a set of longitudinal balancing forces to limit the longitudinal freedom of the valve stem assembly 80 and the air inlet pipe 70, but also realize the docking of the air outlet on the air inlet pipe 70 with the air inlet on the valve stem assembly 80, so as to facilitate the next step of fixed connection, without the need for additional pushing mechanisms, which is convenient for simplifying the structure and saving costs.

[0053] Specifically, the second limiting portion 22 is a side wall on the limiting block 20 that is perpendicular to the clamping direction of the longitudinal clamping mechanism 30. When the valve stem assembly 80 is squeezed against the vertical side wall of the limiting block 20, it can be subjected to a relatively uniform longitudinal squeezing force, thereby reducing the probability of lateral deflection or longitudinal tilt of the valve stem assembly 80.

[0054] Preferably, see Figure 3 - Figure 5 as well as Figure 7 - Fig.11 , a first support block 40 and a second support block 50 can be fixedly arranged on the base 10, so that the first support block 40 can be used to support one end of the longitudinal tube portion of the air intake pipe 70 close to the transverse tube portion, and the second support block 50 can be used to support one end of the longitudinal tube portion of the air intake pipe 70 away from the transverse tube portion. Therefore, with the cooperation of the first support block 40 and the second support block 50, the air intake pipe 70 can be lifted to a specific height so that the air outlet of the air intake pipe 70 can be at the same height as the air outlet of the valve stem assembly 80; in addition, when the longitudinal clamping mechanism 30 pushes the air intake pipe 70 to move longitudinally, the longitudinal tube portion of the air intake pipe 70 will not separate from the first support block 40 and the second support block 50. Therefore, in the process of longitudinal movement of the air intake pipe 70, the first support block 40 and the second support block 50 can both play a due lifting and positioning effect on the air intake pipe 70.

[0055] Specifically, see Figure 5 as well as Figure 8 - Fig.10 A second limiting groove with an upward notch can be opened on the first support block 40 so that the air intake pipe 70 can be placed in the second limiting groove and can be supported by the first support block 40; the specific structure of the locking device provided in this embodiment also includes a transverse clamping mechanism 60, which can push the air intake pipe 70 in the transverse direction to press the air intake pipe 70 in the second limiting groove into the second limiting groove, so that under the cooperation of the transverse clamping mechanism 60 and the second limiting groove, the air intake pipe 70 can be clamped between the second limiting groove and the transverse clamping mechanism 60, so that the lateral displacement and lateral deflection of the air intake pipe 70 can be limited, so as to improve the positioning effect of the air intake pipe 70, and further improve the assembly quality and quality stability of the air intake pipe 70 and the valve stem assembly 80.

[0056] For further information, see Figure 8 The second limiting groove can be set as an L-shaped groove with an acute-angled groove wall, and one of the groove walls of the second limiting groove can be set vertically, that is, the other groove wall of the second limiting groove will be inclined downward from the outside to the inside. On the one hand, when the air intake pipe 70 is placed in the second limiting groove, the inclined groove wall of the second limiting groove will form a certain limit on the air intake pipe 70, thereby preventing the air intake pipe 70 from rolling out of the second limiting groove; on the other hand, setting the second limiting groove as an L-shaped groove can reduce the contact area between the second limiting groove and the air intake pipe 70, thereby reducing the wear between the air intake pipe 70 and the second limiting groove when the longitudinal clamping mechanism 30 clamps the air intake pipe 70.

[0057] See also Figure 5 and Figure 8A clamping block 61 can be set at the working end of the transverse clamping mechanism 60, and a third limiting groove is opened on the clamping block 61. The third limiting groove is an L-shaped groove with a groove opening facing downward and a groove wall at an obtuse angle, and one of the groove walls of the third limiting groove is vertically arranged, that is, the other groove wall of the third limiting groove is inclined upward from the outside to the inside. On the one hand, when the clamping block 61 on the transverse clamping mechanism 60 is pressed toward the first supporting block 40, the third limiting groove on the clamping block 61 can be effectively used to clamp the air intake pipe 70; on the other hand, the inclined groove wall of the third limiting groove can apply a downward inclined pressure to the air intake pipe 70, thereby, combined with the supporting effect of the inclined groove wall of the second limiting groove, the longitudinal displacement and longitudinal deflection of the air intake pipe 70 can be limited.

[0058] Specifically, see Figure 7 A fourth limiting groove with the groove facing upward is opened on the second support block 50, so that the intake pipe 70 can be placed in the fourth limiting groove and can be supported by the second support block 50; the groove wall of the fourth limiting groove can limit the lateral displacement and lateral deflection of the intake pipe 70, so as to further improve the positioning effect of the intake pipe 70, and improve the assembly quality and quality stability of the intake pipe 70 and the valve stem assembly 80.

[0059] As an implementation option, see Figure 7 , Fig. 9 and Fig.11 The fourth limiting groove can be set as a groove with a semicircular cross-section, and the diameter of the fourth limiting groove can be set to be the same as the outer diameter of the air intake pipe 70, so that the fourth limiting groove is equivalent to a contoured structure of the air intake pipe 70, and the limiting effect is better; and the two ends of the semicircular shape of the fourth limiting groove are set on the same plane. On the one hand, it is convenient to place the air intake pipe 70 into the fourth limiting groove, and on the other hand, the lateral limiting function of the fourth limiting groove on the air intake pipe 70 can be fully utilized.

[0060] As another possible implementation, the fourth limiting groove can be set as a U-shaped groove, and the two groove walls of the fourth limiting groove are both in contact with the tube wall of the intake pipe 70, so as to utilize the two groove walls of the fourth limiting groove to limit the lateral movement and lateral deflection of the intake pipe 70.

[0061] It should be noted that the fourth limiting groove may also be set to other shapes as long as it can achieve the function of limiting the lateral movement and lateral deflection of the intake pipe 70.

[0062] Preferably, the limit block 20 and the base 10 can be connected in a detachable manner (such as a threaded connection) to facilitate replacement of the limit block 20 according to the requirements of the valve stem assembly 80, thereby enhancing the adaptability of the locking device provided in this embodiment.

[0063] The first support block 40 and the base 10 may be connected in a detachable manner (eg, threaded connection) so that the first support block 40 can be replaced according to the requirements of the air intake pipe 70 , thereby enhancing the adaptability of the locking device provided in this embodiment.

[0064] The second support block 50 can be connected to the base 10 in a detachable connection (such as a threaded connection) so that the second support block 50 can be replaced according to the requirements of the air intake pipe 70, thereby enhancing the adaptability of the locking device provided in this embodiment.

[0065] In addition, the longitudinal pressing mechanism 30 and the transverse pressing mechanism 60 can both use cylinders as power sources.

[0066] Also, see Figure 3 - Figure 5 A manual valve control mechanism 90 for controlling the extension and retraction of the cylinder can be installed on the base 10.

[0067] In summary, the present invention discloses a locking device, which overcomes many technical defects of the conventional clamp for positioning the air intake pipe 70 and the valve stem assembly 80. The locking device provided in this embodiment can limit the freedom of the valve stem assembly 80 in five directions (front, back, left, right, and bottom), while the self-weight of the valve stem assembly 80 will limit the freedom of the valve stem assembly 80 in another direction (upward), that is, the valve stem assembly 80 can be restricted to its preset position without any deviation or tilt in any direction, and the positioning effect is good, thereby improving the assembly quality and stability of the air intake pipe 70 and the valve stem assembly 80.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A locking device, characterized in that: It comprises a base (10), a limit block (20) and a longitudinal pressing mechanism (30), wherein the limit block (20) is fixed on the base (10); The base (10) is used to support the bottom of the valve stem assembly (80); the limit block (20) has a first limit portion (21), and the first limit portion (21) is used to limit the lateral displacement and lateral deflection of the valve stem assembly (80); the longitudinal clamping mechanism (30) is used to limit the longitudinal displacement and longitudinal inclination of the valve stem assembly (80) and the air intake pipe (70); The first limiting portion (21) is a first limiting groove with an upward notch formed on the limiting block (20), the first limiting groove being capable of accommodating an air outlet pipe (81) on the valve stem assembly (80), and a groove wall of the first limiting groove being capable of limiting lateral displacement and lateral deflection of the air outlet pipe (81) on the valve stem assembly (80); When the air outlet pipe (81) on the valve stem assembly (80) is placed in the first limiting groove, the axial direction of the air outlet pipe on the valve stem assembly (80) is the same as the clamping direction of the longitudinal clamping mechanism (30); The longitudinal clamping mechanism (30) is used to push the air inlet pipe (70) in the longitudinal direction so that the air inlet pipe (70) moves toward the air inlet on the valve stem assembly (80); the limit block (20) also has a second limit portion (22), and the second limit portion (22) is a side wall on the limit block (20) that is perpendicular to the clamping direction of the longitudinal clamping mechanism (30). The longitudinal clamping mechanism (30) cooperates with the second limit portion (22) to limit the longitudinal deviation and longitudinal inclination of the valve stem assembly (80) and the air inlet pipe (70).

2. The locking device according to claim 1, characterized in that: The first limiting groove corresponds one-to-one to the air outlet pipe (81) on the valve stem assembly (80).

3. The locking device according to claim 2, characterized in that: The first limiting groove is a groove with a semicircular cross section, the diameter of the first limiting groove is the same as the outer diameter of the corresponding air outlet pipe (81), and the two ends of the semicircular shape of the first limiting groove are located on the same horizontal plane; Alternatively, the first limiting groove is a U-shaped groove, and the two groove walls of the first limiting groove are used to abut against the tube wall of the corresponding air outlet pipe (81).

4. The locking device according to any one of claims 1 to 3, characterized in that: A first support block (40) and a second support block (50) are fixed on the base (10), wherein the first support block (40) is used to support an end of the longitudinal tube portion of the air intake pipe (70) close to the transverse tube portion, and the second support block (50) is used to support an end of the longitudinal tube portion of the air intake pipe (70) away from the transverse tube portion.

5. The locking device according to claim 4, characterized in that: The first support block (40) is provided with a second limiting groove with the notch facing upwards, and the second limiting groove is capable of accommodating the air inlet pipe (70); The locking device further comprises a transverse pressing mechanism (60), wherein the transverse pressing mechanism (60) is used to push the air intake pipe (70) in a transverse direction so that the air intake pipe (70) is pressed into the second limiting groove, and the transverse pressing mechanism (60) cooperates with the second limiting groove to limit the transverse displacement and transverse deflection of the air intake pipe (70).

6. The locking device according to claim 5, characterized in that: The second limiting groove is an L-shaped groove with a groove wall at an acute angle, and one groove wall of the second limiting groove is vertically arranged; And / or, a clamping block (61) is provided at the working end of the transverse clamping mechanism (60), and a third limiting groove is provided on the clamping block (61), wherein the third limiting groove is an L-shaped groove with a groove opening facing downward and groove walls at an obtuse angle, and one of the groove walls of the third limiting groove is vertically arranged.

7. The locking device according to claim 4, characterized in that: The second support block (50) is provided with a fourth limiting groove with an upward notch, the fourth limiting groove being capable of accommodating the air intake pipe (70), and the groove wall of the fourth limiting groove being capable of limiting the lateral displacement and lateral deflection of the air intake pipe (70).

8. The locking device according to claim 7, characterized in that: The fourth limiting groove is a groove with a semicircular cross section, the diameter of the fourth limiting groove is the same as the outer diameter of the air intake pipe (70), and the two ends of the semicircular shape of the fourth limiting groove are located on the same horizontal plane; Alternatively, the fourth limiting groove is a U-shaped groove, and both groove walls of the fourth limiting groove abut against the tube wall of the corresponding air outlet pipe (81).

9. The locking device according to claim 4, characterized in that: The limiting block (20), the first supporting block (40) and / or the second supporting block (50) are detachably connected to the base (10).

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