A positioning structure with elastic guide, ball valve and positioning method thereof

Abstract

The present invention relates to the technical field related to ball valves, and specifically to an elastically assisted positioning structure, a ball valve and a positioning method thereof, wherein the elastically assisted positioning structure comprises a valve body, a ball movably arranged in the valve body and a valve stem fixedly connected to the ball, and further comprises: a shell fixed to the valve body, the valve stem passing through the shell, and a lever fixed to the end of the valve stem away from the ball, the valve stem being connected to a lateral movement mechanism installed in the shell; a two-way ejection mechanism installed in the shell and connected to the lateral movement mechanism, so that the ball can rotate rapidly and continuously when approaching a closing point or an opening point, thereby achieving the effect of automatic reference positioning, and avoiding the problem that the internal components of the valve body are deformed due to excessive force applied by the staff when the valve body is close to the closing or opening state, thereby affecting the accuracy of the valve body, thereby effectively improving the durability of the valve body.

Description

Technical Field

[0001] The invention relates to the technical field related to ball valves, and in particular to an elastically assisted positioning structure, a ball valve and a positioning method thereof. Background Art

[0002] The ball valve is a very common valve with a wide range of applications. As a multifunctional valve, it plays an important role in industrial production and life. It can control the flow of the medium, adjust the pressure of the medium, cut off the passage of the medium, prevent leakage and contamination of the medium, and ensure the safe operation of the system. At the same time, the ball valve also has the characteristics of good corrosion resistance and high reliability, and is widely used in the fields of petroleum, chemical industry, electric power, pharmaceuticals, tap water, etc.

[0003] When the ball valve is switched between closed and open states, the ball only needs to rotate 90°. Therefore, during actual operation, in order to ensure that the ball has completed a 90° rotation (that is, the valve body is fully closed or open), when the valve stem rotates close to 90°, the force applied by the staff will be excessive, which will cause a certain degree of deformation of the components inside the valve body. In the long run, the internal components of the valve body will be damaged, thereby affecting the accuracy of the valve and making the valve less durable. Summary of the invention

[0004] The object of the present invention is to provide a positioning structure with elastic guidance, a ball valve and a positioning method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An elastically guided positioning structure comprises a valve body, a ball movably arranged in the valve body, and a valve stem fixedly connected to the ball, and further comprises:

[0007] A housing is fixed on the valve body, the valve stem passes through the housing, a lever is fixed to one end of the valve stem away from the ball, and the valve stem is connected to a lateral movement mechanism installed in the housing;

[0008] A two-way ejection mechanism is installed in the housing and connected to the lateral movement mechanism. The lateral movement mechanism is triggered when the valve stem drives the ball to rotate, and can cause the two-way ejection mechanism to store elastic potential energy;

[0009] A sliding fit mechanism is disposed in the housing, connecting the two-way ejection mechanism and the valve stem. The two-way ejection mechanism can release elastic potential energy during the rotation of the valve stem and change the rotation speed of the valve stem through the sliding fit mechanism so that the valve stem continues to rotate to the end of the stroke and the valve body is closed or opened.

[0010] As a further solution of the present invention: the lateral movement mechanism includes a guide rail fixed on the inner wall of the shell and a sliding seat slidably engaged on the guide rail, a guide plate is fixedly installed on the sliding seat, the two-way ejection mechanism is installed on the guide plate, and the sliding seat is connected to the valve stem through a telescopic arm group.

[0011] As a further solution of the present invention: the telescopic arm group includes a first connecting arm fixedly mounted on the valve stem and a second connecting arm slidably fitted with the first connecting arm, and the second connecting arm is rotatably connected to the sliding seat at one end away from the valve stem.

[0012] As a further solution of the present invention: the two-way ejection mechanism includes an assembly plate slidably arranged on the guide plate, a cylinder fixedly mounted on the assembly plate, and a vertical rod slidably fitted with the cylinder, the outer periphery of the vertical rod is sleeved with a first cylindrical spring and a second cylindrical spring, the head ends of the first cylindrical spring and the second cylindrical spring are connected to a ring body fixedly arranged on the vertical rod, and the tail ends abut against the inner wall of the cylinder, one end of the vertical rod is connected to the sliding fitting mechanism, and the other end is connected to a guide limit assembly.

[0013] As a further solution of the present invention: the guide limit assembly includes a limit plate fixedly mounted on the bottom wall of the shell, the limit plate is provided with a rectangular groove, the vertical rod extends into the rectangular groove and is slidably connected with the limit plate, the rectangular groove includes a first groove section, a second groove section, a third groove section and a fourth groove section that are connected, and the width of the second groove section and the fourth groove section is greater than the width of the first groove section and the third groove section;

[0014] Among them, a column is fixed on the cylinder, and the limiting plate is also provided with a through groove adapted to the column. The column extends into the through groove and is slidably connected to the limiting plate. The through groove includes a first straight section, an inclined section and a second straight section connected to each other.

[0015] As a further solution of the present invention: the sliding matching mechanism includes two guide posts fixed in the housing, a cross bar slidably arranged on the two guide posts, and a slider slidably arranged on the cross bar and fixedly connected to the vertical bar;

[0016] The cross bar is fixedly connected to a sleeve slidably mounted on the valve stem through a connecting plate, a boss is fixed on the inner wall of the sleeve, a transmission groove adapted to the boss is provided on the outer wall of the valve stem, the orthographic projection of the transmission groove is a non-special flat quadrilateral, the boss extends into the transmission groove and is slidably connected to the valve stem, and the transmission groove includes a first arc segment, a first transition segment, a second arc segment and a second transition segment that are connected.

[0017] A ball valve comprises the elastically assisted positioning structure.

[0018] A method for opening and closing the ball valve comprises the following steps:

[0019] Step 1: drive the valve stem to rotate the ball through the lever;

[0020] Step 2: The valve stem drives the lateral moving mechanism to move, and the lateral moving mechanism stores elastic potential energy;

[0021] Step 3: The lateral movement mechanism releases elastic potential energy and prompts the sliding matching mechanism to perform an auxiliary positioning action;

[0022] Step 4: The sliding fit mechanism drives the valve stem to rotate to open or close the ball valve.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the present invention is novel in design, and through the mutual cooperation between various mechanisms and components, during the process of closing or opening the valve body, the elastic potential energy is stored and released by the two-way ejection mechanism, so that the ball can rotate rapidly and continuously when approaching the closing point or the opening point, thereby achieving the effect of automatic reference positioning, and can avoid the problem of deformation of internal components of the valve body due to excessive force applied by the staff when the valve body is close to the closing or opening state, thereby affecting the accuracy of the valve body, thereby effectively improving the durability of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural schematic diagram of an embodiment of a positioning structure with elastic assistance.

[0025] Figure 2 A half-section view of an embodiment of a positioning structure with elastic assistance.

[0026] Figure 3 A schematic diagram of the internal structure of a shell in one embodiment of a positioning structure with elastic assistance.

[0027] Figure 4 for Figure 3 A magnified view of the structure at center.

[0028] Figure 5 A schematic diagram of the connection relationship between the lateral movement mechanism and the valve stem in an embodiment of the elastically assisted positioning structure.

[0029] Figure 6 for Figure 5 Schematic diagram of the structure from another angle.

[0030] Figure 7 An exploded view of the structure of a bidirectional ejection mechanism in one embodiment of an elastically assisted positioning structure.

[0031] In the figure: 1, valve body; 2, ball; 3, valve stem; 301, first arc section; 302, first transition section; 303, second arc section; 304, second transition section; 4, lever; 5, housing; 6, first connecting arm; 7, second connecting arm; 8, guide rail; 9, sliding seat; 10, assembly plate; 11, cylinder; 12, vertical rod; 13, ring body; 14, first cylindrical spring; 15, second cylindrical spring; 16, limit plate; 1601, first slot section; 1602, second slot section; 1603, third slot section; 1604, fourth slot section; 1605, first straight section; 1606, inclined section; 1607, second straight section; 17, guide column; 18, cross bar; 19, connecting plate; 20, sleeve; 21, slider; 22, guide plate; 23, column. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0033] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0034] See also Figure 1-Figure 7 In an embodiment of the present invention, an elastically guided positioning structure includes a valve body 1, a ball 2 movably disposed in the valve body 1, and a valve stem 3 fixedly connected to the ball 2, and further includes:

[0035] A housing 5 is fixed on the valve body 1. The valve stem 3 passes through the housing 5. A lever 4 is fixed to the end of the valve stem 3 away from the ball 2. The valve stem 3 is connected to a lateral movement mechanism installed in the housing 5.

[0036] A two-way ejection mechanism is installed in the housing 5 and connected to the lateral movement mechanism. The lateral movement mechanism is triggered when the valve stem 3 drives the ball 2 to rotate, and can cause the two-way ejection mechanism to store elastic potential energy;

[0037] A sliding fit mechanism is disposed in the housing 5, connecting the two-way ejection mechanism and the valve stem 3. The two-way ejection mechanism can release elastic potential energy during the rotation of the valve stem 3, and change the rotation speed of the valve stem 3 through the sliding fit mechanism, so that the valve stem 3 continues to rotate to the end of the stroke, and the valve body 1 is closed or opened.

[0038] In detail, starting from the state shown in the accompanying drawings, at this time, the valve body 1 is in an open state. When the valve body 1 needs to be closed, the valve stem 3 can be driven to drive the ball 2 to rotate by toggling the lever 4. Accordingly, when the valve stem 3 rotates, it will drive the lateral movement mechanism to move, so that the two-way ejection mechanism reserves elastic potential energy. When the ball 2 is about to complete a 90° rotation, the two-way ejection mechanism releases the elastic potential energy and drives the sliding fit mechanism to move, so that the sliding fit mechanism drives the valve stem 3 to quickly complete the remaining angle of rotation, so that the ball 2 completes a 90° rotation process, and the valve body 1 is switched from an open state to a closed state;

[0039] When the valve body 1 needs to be opened, similarly, the valve stem 3 is driven by the lever 4 to rotate the ball 2. When the ball 2 is about to complete a 90° rotation, the two-way ejection mechanism releases elastic potential energy, prompting the ball 2 to quickly complete the remaining rotation, and the valve body 1 is fully opened.

[0040] In summary, through the mutual cooperation between various mechanisms and components, during the process of closing or opening the valve body 1, the elastic potential energy is stored and released by the two-way ejection mechanism, so that the ball 2 can rotate quickly and continuously when approaching the closing point or the opening point, thereby achieving the effect of automatic reference positioning, and can avoid the problem that the internal components of the valve body 1 are deformed due to excessive force applied by the staff when the valve body 1 is close to the closing or opening state, thereby affecting the accuracy of the valve body 1, thereby effectively improving the durability of the valve body 1.

[0041] For example, when the valve body 1 switches from a closed state to an open state or from an open state to a closed state, the valve stem 3 drives the ball 2 to rotate by 90°. Accordingly, the two-way ejection mechanism stores elastic potential energy during the process of the valve stem 3 rotating by 75°. When the valve stem 3 drives the ball 2 to rotate by an angle exceeding 75°, the two-way ejection mechanism releases the elastic potential energy. Since the release of the elastic potential energy is instantaneous and has an assisting effect on the rotation of the lever 4, the valve stem 3 and the ball 2, the sliding fit mechanism acts quickly to cause the valve stem 3 to drive the ball The body 2 quickly completes the rear 15° rotation, so that the valve body 1 is closed or opened. Therefore, in actual operation, when the rotation angle of the ball 2 exceeds 75°, the staff whose fingers touch the lever 4 can obviously feel the auxiliary guiding force generated by the release of elastic potential energy of the two-way ejection mechanism. At this time, the staff can release the lever 4, and the sliding matching mechanism drives the valve stem 3 to drive the ball 2 to complete the rear degree of rotation, thereby realizing the auxiliary positioning function and avoiding the problem that the internal components of the valve body 1 are deformed due to excessive force applied by the staff when the valve body 1 is close to the closed or opened state, thereby affecting the accuracy of the valve body 1.

[0042] Please refer again Figure 4 and Figure 5 The lateral movement mechanism includes a guide rail 8 fixed on the inner wall of the housing 5 and a sliding seat 9 slidably engaged with the guide rail 8, a guide plate 22 is fixedly mounted on the sliding seat 9, the two-way ejection mechanism is mounted on the guide plate 22, and the sliding seat 9 is connected to the valve stem 3 through a telescopic arm group. The telescopic arm group includes a first connecting arm 6 fixedly mounted on the valve stem 3 and a second connecting arm 7 slidably engaged with the first connecting arm 6, and the end of the second connecting arm 7 away from the valve stem 3 is rotatably connected to the sliding seat 9.

[0043] When the staff member moves the lever 4 so that the lever 4 drives the ball 2 to rotate through the valve stem 3, the valve stem 3 drives the first connecting arm 6 and the second connecting arm 7 to deflect, and the first connecting arm 6 and the second connecting arm 7 drive the sliding seat 9 to slide along the guide rail 8. The second connecting arm 7 gradually contracts toward the inside of the first connecting arm 6 during the process of rotating from the inclined state to the position (45°) perpendicular to the guide rail 8, and gradually extends toward the outside of the first connecting arm 6 during the process of continuing to rotate (45°) from the position perpendicular to the guide rail 8;

[0044] The first connecting arm 6 and the second connecting arm 7 rotate with the valve stem 3. Therefore, the process of the ball 2 rotating 90° is equivalent to the sliding process of the sliding seat 9 on the guide rail 8. The sliding process of the sliding seat 9 toward both sides is the closing or opening process of the valve body 1. In the first large sliding stroke of the sliding seat 9 on the guide rail 8, the two-way ejection mechanism stores elastic potential energy, and in the latter small sliding stroke, the two-way ejection mechanism releases elastic potential energy, prompting the sliding matching mechanism to drive the valve stem 3 to complete the remaining angle of rotation, and the ball 2 makes the valve body 1 completely closed or opened.

[0045] Please refer again Figure 4 and Figure 7 The bidirectional ejection mechanism includes an assembly plate 10 slidably arranged on the guide plate member 22, a cylinder 11 fixedly mounted on the assembly plate 10, and a vertical rod 12 slidably fitted with the cylinder 11. The outer periphery of the vertical rod 12 is sleeved with a first cylindrical spring 14 and a second cylindrical spring 15. The head ends of the first cylindrical spring 14 and the second cylindrical spring 15 are connected to a ring body 13 fixedly arranged on the vertical rod 12, and the tail ends abut against the inner wall of the cylinder 11. One end of the vertical rod 12 is connected to the sliding fitting mechanism, and the other end is connected to a guide limit assembly. The guide and limiting assembly includes a limiting plate 16 fixedly mounted on the bottom wall of the shell 5, and a rectangular groove is provided on the limiting plate 16. The vertical rod 12 extends into the rectangular groove and is slidably connected to the limiting plate 16. The rectangular groove includes a first groove section 1601, a second groove section 1602, a third groove section 1603 and a fourth groove section 1604 that are connected, and the widths of the second groove section 1602 and the fourth groove section 1604 are greater than the widths of the first groove section 1601 and the third groove section 1603.

[0046] Furthermore, a column 23 is fixed on the cylinder 11, and a through groove adapted to the column 23 is also provided on the limiting plate 16. The column 23 extends into the through groove and is slidably connected to the limiting plate 16. The through groove includes a first straight section 1605, an inclined section 1606 and a second straight section 1607 that are connected.

[0047] Taking the state of the accompanying figure as the starting point, the column 23 is located at one end of the first straight section 1605 away from the inclined section 1606, and the end of the vertical rod 12 is located at the connecting inflection point of the first slot section 1601 and the fourth slot section 1604. When the valve stem 3 is driven by the lever 4 to drive the ball 2 to rotate, the valve stem 3 drives the sliding seat 9 to slide along the guide rail 8 through the first connecting arm 6 and the second connecting arm 7. Accordingly, the column 23 first moves along the first straight section 1605, and the vertical rod 12 moves along the first slot section 1601. When the column 23 slides along the inclined section 1606, the column 23 will slide with the limit plate 16, so that the cylinder 11 will drive the assembly plate 10 to slide downward on the guide plate 22. At this time, the lower end of the vertical rod 12 is in a limited position in the first slot section 1601, so that the first column spring 14 will be compressed. When the lower end of the vertical rod 12 moves to the second slot section 1602 (at this time, the ball 2 has not completed a 90° rotation, and citing the above example, it has completed a 75° rotation), the first column spring 14 will rebound, so that the vertical rod 12 quickly moves to the connection between the second slot section 1602 and the third slot section 1603. At the same time, the upper end of the vertical rod 12 drives the sliding fitting mechanism to move, so that the valve stem 3 quickly rotates the remaining angle (so the width of the second slot section 1602 and the fourth slot section 1604 needs to be greater than the width of the first slot section 1601 and the third slot section 1603), and the valve body 1 is successfully closed;

[0048] Similarly, when the valve body 1 needs to be opened, the ball 2 is rotated in the opposite direction, the sliding seat 9 changes the sliding direction, the column 23 first slides along the second straight section 1607, and the lower end of the vertical rod 12 enters the third groove section 1603. When the column 23 moves along the inclined section 1606, the cylinder 11 drives the assembly plate 10 to slide upward on the guide plate 22, so that the second column spring 15 is compressed. Subsequently, after the vertical rod 12 enters the fourth groove section 1604, the second column spring 15 rebounds, and the vertical rod 12 quickly moves to the connection between the first groove section 1601 and the fourth groove section 1604, and prompts the sliding matching mechanism to drive the valve stem 3 to drive the ball 2 to quickly complete the remaining angle of rotation, thereby opening the valve body 1.

[0049] Please refer again Figure 4 , Figure 6 as well as Figure 7The sliding matching mechanism includes two guide posts 17 fixed in the housing 5, a cross bar 18 slidably arranged on the two guide posts 17, and a slider 21 slidably arranged on the cross bar 18 and fixedly connected to the vertical bar 12. The cross bar 18 is fixedly connected to a sleeve 20 slidably sleeved on the valve stem 3 through a connecting plate 19, a boss is fixed on the inner wall of the sleeve 20, a transmission groove adapted to the boss is provided on the outer wall of the valve stem 3, the positive projection of the transmission groove is a non-special flat quadrilateral, the boss extends into the transmission groove and is slidably connected to the valve stem 3, and the transmission groove includes a first arc segment 301, a first transition segment 302, a second arc segment 303 and a second transition segment 304 connected to each other.

[0050] Citing the above example, further speaking, initially, the boss is located at the connecting inflection point between the first arc segment 301 and the second transition segment 304. During the closing process of the valve body 1, after the valve stem 3 rotates 75°, the boss is located at the connecting inflection point between the first arc segment 301 and the first transition segment 302. Subsequently, the first column spring 14 rebounds, and the vertical rod 12 drives the cross rod 18 to slide downward on the two guide columns 17 through the slider 21. The cross rod 18 drives the sleeve 20 to slide downward on the valve stem 3 through the connecting plate 19. The boss slides with the valve stem 3 through the first transition segment 302, so that the valve stem 3 quickly completes the remaining rotation angle (15°). Finally, the boss is located at the connecting inflection point between the first transition segment 302 and the second arc segment 303.

[0051] Similarly, during the opening process of the valve body 1, the valve stem 3 first rotates in the opposite direction by 75°, and the boss is located at the connecting inflection point between the second arc segment 303 and the second transition segment 304. Subsequently, the second cylindrical spring 15 rebounds, so that the boss slides with the valve stem 3 through the second transition segment 304, and the valve stem 3 quickly completes the rotation of the remaining angle (15°), and the boss is located at the connecting inflection point between the first arc segment 301 and the second transition segment 304.

[0052] As another embodiment of the present invention, a ball valve is also provided, and the ball valve includes the elastically assisted positioning structure.

[0053] As another embodiment of the present invention, a method for opening and closing positioning of the ball valve is also proposed, comprising the following steps:

[0054] Step 1: The valve stem 3 drives the ball 2 to rotate by the lever 4;

[0055] Step 2: the valve stem 3 drives the lateral moving mechanism to move, and enables the lateral moving mechanism to store elastic potential energy;

[0056] Step 3: The lateral movement mechanism releases elastic potential energy and prompts the sliding matching mechanism to perform an auxiliary positioning action;

[0057] Step 4: The sliding fit mechanism drives the valve stem 3 to rotate, so that the ball valve is opened or closed.

[0058] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An elastically guided positioning structure, comprising a valve body (1), a ball (2) movably arranged in the valve body (1), and a valve stem (3) fixedly connected to the ball (2); It is characterized in that Also includes: A shell (5) is fixed on the valve body (1); the valve stem (3) passes through the shell (5); a lever (4) is fixed to the end of the valve stem (3) away from the ball (2); and the valve stem (3) is connected to a lateral movement mechanism installed in the shell (5); a bidirectional ejection mechanism, installed in the housing (5) and connected to the transverse movement mechanism, wherein the transverse movement mechanism is triggered when the valve stem (3) drives the ball (2) to rotate, and can cause the bidirectional ejection mechanism to store elastic potential energy; a sliding fit mechanism, arranged in the housing (5), connecting the bidirectional ejection mechanism and the valve stem (3); the bidirectional ejection mechanism can release elastic potential energy during the rotation of the valve stem (3), and change the rotation speed of the valve stem (3) through the sliding fit mechanism, so that the valve stem (3) continues to rotate to the end of the stroke, and the valve body (1) is closed or opened; The lateral movement mechanism comprises a guide rail (8) fixed on the inner wall of the housing (5) and a sliding seat (9) slidably engaged with the guide rail (8), a guide plate (22) being fixedly mounted on the sliding seat (9), the two-way ejection mechanism being mounted on the guide plate (22), and the sliding seat (9) being connected to the valve stem (3) via a telescopic arm assembly; The bidirectional ejection mechanism comprises an assembly plate (10) slidably mounted on the guide plate (22), a cylinder (11) fixedly mounted on the assembly plate (10), and a vertical rod (12) slidably sleeved with the cylinder (11); a first cylindrical spring (14) and a second cylindrical spring (15) are sleeved on the outer periphery of the vertical rod (12); the first ends of the first cylindrical spring (14) and the second cylindrical spring (15) are connected to a ring body (13) fixedly mounted on the vertical rod (12), and the tail ends thereof are in contact with the inner wall of the cylinder (11); one end of the vertical rod (12) is connected to the sliding matching mechanism, and the other end is connected to a guide limit assembly; In the first short process of the valve body (1) switching from the closed state to the open state or from the open state to the closed state, the lever (4) is moved, and the lever (4) drives the ball (2) to rotate through the valve stem (3), and the two-way ejection mechanism stores elastic potential energy; in the second short process, the two-way ejection mechanism releases the elastic potential energy, so that the valve stem (3) completes the rotation of the remaining angle, and the valve body (1) is completely closed or opened through the ball (2).

2. The elastic guide-assisted positioning structure according to claim 1, characterized in that: The telescopic arm assembly comprises a first connecting arm (6) fixedly mounted on the valve stem (3) and a second connecting arm (7) slidably fitted with the first connecting arm (6), and an end of the second connecting arm (7) away from the valve stem (3) is rotatably connected to the sliding seat (9).

3. The elastic guide-assisted positioning structure according to claim 2, characterized in that: The guide limiter assembly comprises a limiter plate (16) fixedly mounted on the bottom wall of the housing (5), the limiter plate (16) being provided with a rectangular groove, the vertical rod (12) extending into the rectangular groove and being slidably connected to the limiter plate (16), the rectangular groove comprising a first groove section (1601), a second groove section (1602), a third groove section (1603) and a fourth groove section (1604) which are connected, and the width of the second groove section (1602) and the fourth groove section (1604) is greater than the width of the first groove section (1601) and the third groove section (1603); A column (23) is fixed on the cylinder (11), and a through groove adapted to the column (23) is provided on the limiting plate (16); the column (23) extends into the through groove and is slidably connected to the limiting plate (16); the through groove comprises a first straight section (1605), an inclined section (1606), and a second straight section (1607) which are connected to each other.

4. The elastic guide-assisted positioning structure according to claim 3, characterized in that: The sliding fit mechanism comprises two guide posts (17) fixed in the housing (5), a cross bar (18) slidably disposed on the two guide posts (17), and a sliding block (21) slidably disposed on the cross bar (18) and fixedly connected to the vertical bar (12); The cross bar (18) is fixedly connected to a sleeve (20) slidably mounted on the valve stem (3) via a connecting plate (19); a boss is fixedly mounted on the inner wall of the sleeve (20); a transmission groove adapted to the boss is provided on the outer wall of the valve stem (3); the positive projection of the transmission groove is a parallelogram; the boss extends into the transmission groove and is slidably connected to the valve stem (3); the transmission groove comprises a first arc segment (301), a first transition segment (302), a second arc segment (303) and a second transition segment (304) which are connected to each other.

5. A ball valve, characterized in that: It comprises the elastically guided positioning structure as described in any one of claims 1 to 4.

6. A method for opening and closing positioning of a ball valve as claimed in claim 5, characterized in that: The following steps are involved: Step 1: driving the valve stem (3) to drive the ball (2) to rotate by means of the lever (4); Step 2: the valve stem (3) drives the lateral movement mechanism to move, and enables the bidirectional ejection mechanism to store elastic potential energy; Step 3: The bidirectional ejection mechanism releases elastic potential energy and prompts the sliding matching mechanism to perform an auxiliary positioning action; Step 4: The sliding fit mechanism drives the valve stem (3) to rotate, thereby opening or closing the ball valve.

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