Torque-limited self-locking operating device

Abstract

The present application relates to a kind of limited torque self-locking operating device, including handle frame (100), operating handle (200), locking disc (300) and locking piece (400), the locking disc (300) is fixed on the rotating operating mechanism, the handle frame is equipped with operating shaft sleeve (110), the operating shaft sleeve (110) is covered on the operating shaft (20), and operating shaft is rotated, the operating handle (200) is equipped with driving head (210), the driving head (210) drives the locking piece (400) and is pressed to the locking disc (300), the handle frame is equipped with top pressure spring (130), the driving head is equipped with drive ball socket (211), and the top pressure spring (130) is pressed to the drive ball socket (211) by top pressure ball (230).The present application adopts top pressure spring and is pressed to drive ball socket by top pressure ball, and the output torque of operating shaft sleeve is infinitely adjustable;Adopt locking disc, can lock valve stem in valve closed position, so that valve reliably keeps closed state, operating handle is rotated relative to handle frame in the operation of driving self-locking clamp opening and clamping locking disc, can provide significant indication feature for the closed state of valve, avoid misjudgment to the closed state of valve.

Description

Technical Field

[0001] This invention pertains to rotary operating devices, and more particularly to a torque-limiting self-locking operating device. Background Technology

[0002] In mechanical structures, rotary drive devices with operating shafts are commonly used, such as valve stems and lead screws in vises. Taking valves as an example, the valve operating handle drives the valve stem to rotate, used for opening and closing the valve, such as ball valves and butterfly valves. The operating handle rotates within a 90° range, and its position indicates the valve's open / closed status. The operating handle should provide sufficient torque to ensure the valve's opening and closing, and should also prevent overload damage to the valve structure when closing the valve. Simultaneously, the valve needs to lock the valve core and operating handle in the closed position to reliably maintain the closed position. Therefore, an excellent operating handle structure design is crucial for the valve's opening / closing operation and sealing performance. Furthermore, for forced-seal ball valves, as disclosed in Chinese invention patent "A Forced-Seal Valve Stem Operating Device" (Publication No. CN112361012A), the valve stem drives the upper and lower valve disc drive components to rotate within the valve's opening and closing stroke, thus opening and closing the valve. The valve stem also rotates relative to the upper and lower valve disc drive components in the closed position, driving them to move along the valve stem axis. These components then drive the sealing valve disc to press against the valve seat, achieving forced sealing. Forced-seal valves achieve this by using the torque output from the operating device to press the valve disc against the valve seat. Insufficient torque will not achieve a seal, while excessive torque may damage valve components. After forced sealing and closure, the operating handle does not remain in the normal closed position; it may even overlap with the open position. This makes it difficult for valve operators to judge the valve's open / closed status, potentially leading to misoperation. Summary of the Invention

[0003] The purpose of this invention is to propose a technical solution for a torque-limiting self-locking operating device, which can be applied in the field of valves. It can infinitely output a specific sealing torque, reliably lock the valve in a closed state, and clearly display the closed state of the valve.

[0004] To achieve the above objectives, the technical solution of the present invention is: a torque-limiting self-locking operating device for rotating operating mechanism, the rotating operating mechanism having an operating shaft, including a handle bracket (100), an operating handle (200), a locking disc (300), and a locking member (400), the locking disc (300) being fixed on the rotating operating mechanism, the handle bracket having an operating shaft sleeve (110), the operating shaft sleeve (110) being sleeved on the operating shaft (20) and driving the operating shaft (20) to rotate, the operating handle (200) having a drive head (210), the drive head (210) driving the locking member (400) to press the locking disc (300) through a helical engagement, the handle bracket having a top pressure spring (130), the drive head having a drive ball socket (211), the top pressure spring (130) pressing the drive ball socket (211) through a top pressure ball (230).

[0005] Furthermore, a preferred locking member drive structure is that the drive head (210) is provided with a screw hole (212), the locking member (400) is provided with a stud (410), and when the operating handle rotates relative to the handle frame, the drive head (210) drives the locking member (400) through threaded engagement.

[0006] Furthermore, in one configuration where the locking member presses against the locking disc, the handle is provided with a self-locking clamp (120), the locking disc (300) is embedded in the self-locking clamp, and the driving head (210) drives the locking member (400) to press against the self-locking clamp (120), thereby clamping the locking disc (300).

[0007] Furthermore, in order to achieve the locking member pressing the self-locking clamp, the locking member (400) is provided with a pressure plate (420), the pressure plate (420) is fixed on the outside of the self-locking clamp, and the driving head (210) drives the pressure plate (420) to press the self-locking clamp (120).

[0008] Furthermore, another structure in which the locking member presses the locking disc is as follows: the locking member (400) is provided with a pressure plate (420), the handle bracket is provided with a locking guide hole (170), the pressure plate is provided with a locking guide pin (440), the locking guide pin (440) slides with the locking guide hole (170), and the driving head (210) drives the pressure plate (420) to press the locking disc (300).

[0009] Furthermore, to ensure the operational reliability of the top-pressure ball, the drive ball socket (211) is a spherical groove corresponding to the top-pressure ball (230). The drive head is provided with a reset ramp (213) and a locking ramp (214). The reset ramp (213) and the locking ramp (214) are arc-shaped grooves corresponding to the top-pressure ball (230). The depth of the drive ball socket (211) is greater than that of the reset ramp (213). When the operating handle is rotated in the locking direction, the top-pressure ball (230) enters the reset ramp (213) and the locking ramp (214) in sequence. The reset ramp (213) is provided with a slope that causes the top-pressure ball (230) to move toward the drive ball socket (211). The locking ramp (214) is provided with a slope that causes the top-pressure ball (230) to move away from the drive ball socket (211).

[0010] Furthermore, a preferred top pressure spring mounting structure is that the handle is provided with a spring sleeve (140), and the top pressure spring (130) is disposed inside the spring sleeve (140).

[0011] Furthermore, a preferred locking disc structure is that the locking disc (300) is a disc spring shaped locking disc.

[0012] Furthermore, the locking disc is fixed to the rotary operating mechanism (1A) by screws (310).

[0013] Furthermore, the torque-limiting self-locking operating device is an operating device installed on the forced sealing ball valve. The rotary operating mechanism includes a valve cover (1A), an operating shaft (20) which is a valve stem, a locking disc fixed on the valve cover (1A), and an operating shaft sleeve (110) fitted on the valve stem (20) and driving the valve stem to rotate. During the stroke of the valve stem (20) driving the valve core (70) to rotate from the open position to the closed position, the operating handle (200) rotates synchronously with the handle bracket (100) and the valve stem (20) under the action of the top pressure spring (130). When the valve core is in the closed position, the operating handle continues to drive the handle bracket and the valve stem to rotate in the closing direction, and drives the sealing valve disc (80) to press against the valve seat (90). After that, the handle bracket and the valve stem stop rotating, and the operating handle rotates relative to the handle bracket against the force of the top pressure spring, driving the locking member (400) to press against the locking disc (300).

[0014] The beneficial effects of this invention are as follows: The use of a top-pressure spring that presses against the ball socket via a top-pressure ball allows for stepless adjustment of the spring's clamping force and the operating sleeve's output torque, ensuring a safe and reliable valve seal. The use of a self-locking clamping disc locks the valve stem in the closed position, reliably maintaining the valve in the closed state. The operating handle rotates relative to the handle holder during the operation of driving the self-locking clamping disc, providing a clear indication of the valve's closed state and preventing misjudgments of the valve's closed status.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present invention, wherein the handle bracket is provided with a self-locking clamp;

[0017] Figure 2 This is an exploded view of the structure of the present invention;

[0018] Figure 3 This is a structural cross-sectional view of the present invention;

[0019] Figure 4 yes Figure 3 The AA sectional view is a structural cross-sectional view of the handle frame and the operating handle;

[0020] Figure 5 This is a structural diagram of the driver head of the present invention;

[0021] Figure 6 This is a structural diagram of the locking disc of the present invention;

[0022] Figure 7 This is a structural diagram of the invention, in which the locking element directly presses against the locking disc;

[0023] Figure 8 yes Figure 7 A sectional view of the structure;

[0024] Figure 9 This is an operational schematic diagram of the present invention, with the operating handle in the open position;

[0025] Figure 10 This is an operational schematic diagram of the present invention, showing the operating handle rotated to the valve closed position;

[0026] Figure 11 This is an operational schematic diagram of the present invention, showing the top pressure ball (230) entering the reset groove;

[0027] Figure 12 This is an operation diagram of the present invention. As the operating handle continues to rotate, the top pressure ball (230) enters the locking groove, and the self-locking clamp clamps the locking disc.

[0028] Figure 13This is an exploded view of the invention and the valve.

[0029] Figure 14 This is a structural diagram of an example forced-sealing valve;

[0030] Figure 15 This is an exploded view of the stem operating device of a forced-seal valve, as shown in the example.

[0031] Figure 16 This is an operational schematic diagram of the present invention. The operating handle needs to be rotated further from the valve closed position in the closing direction to drive the valve stem to complete the rotational stroke for forced sealing.

[0032] Figure 17 This is an operational schematic diagram of the present invention. The operating handle rotates relative to the handle bracket in the valve's forced sealing position, and the locking element locks the locking disc. Detailed Implementation

[0033] Example 1:

[0034] like Figures 1 to 6 A torque-limiting self-locking operating device is provided for a rotating operating mechanism, the rotating operating mechanism being provided with an operating shaft. This embodiment takes a valve as an example; the rotating mechanism is the valve's operating mechanism, including a valve cover, and the operating shaft is a valve stem (20). The torque-limiting self-locking operating device includes a handle holder (100), an operating handle (200), a locking disc (300), and a locking element (400).

[0035] The locking disc (300) is a disc with a spring-shaped structure, including a recessed end (340) and a raised end (350). The locking disc has a central hole (320) and is fixed to the valve cover (1A) by screws (310). The recessed end (340) of the locking disc is connected to the valve cover (1A). The valve stem (20) passes through the central hole (320) of the locking disc and protrudes from the outer wall of the valve cover.

[0036] The handle holder (100) includes a handle holder sheet metal part (101), on which a self-locking clamp (120) is provided. The locking disc (300) is embedded in the self-locking clamp (120). In its natural state, the clamping width S1 of the self-locking clamp (120) corresponds to the thickness S2 of the locking disc (300), and the self-locking clamp (120) can rotate around the locking disc. The sheet metal part (101) is also provided with an operating shaft hole (160) that runs through the entire sheet metal part (including the self-locking clamp 120).

[0037] The handle frame is equipped with an operating sleeve (110), which has an inner hole (111) that mates with the valve stem. The inner hole of the operating sleeve has a keyway (112). The operating sleeve (110) is welded to the sheet metal part (101) of the handle frame. In this embodiment, the upper end of the operating sleeve (110) is a closed end, that is, the upper end of the operating sleeve is closed by the sheet metal part of the handle frame. The valve stem (20) passes through the operating sleeve (110) from the lower end. The operating sleeve (110) is connected to the valve stem by a key (114), so that it can drive the valve stem to rotate synchronously. Since the upper end of the operating sleeve is closed by the sheet metal part of the handle frame, the valve stem can be hidden and the valve stem is protected.

[0038] The handle frame is provided with a spring sleeve (140), which is welded to the sheet metal of the handle frame. A top pressure spring (130) is provided inside the spring sleeve. The end of the spring sleeve is provided with a screw (141) for adjusting and tightening the top pressure spring. The top pressure spring (130) presses against a top pressure ball (230).

[0039] The operating handle (200) has a drive head (210) at the front end. The inner hole of the drive head (210) is a screw hole (212). The outer wall of the drive head has a drive ball socket (211). The drive ball socket (211) is a spherical groove corresponding to the top pressure ball (230). The drive head has a reset groove (213) and a locking groove (214). The reset groove (213) and the locking groove (214) are arc-shaped grooves corresponding to the top pressure ball (230). The depth of the drive ball socket (211) is greater than that of the reset groove (213). The reset groove (213) has a slope that causes the top pressure ball (230) to move toward the drive ball socket (211). The locking groove (214) has a slope that causes the top pressure ball (230) to move away from the drive ball socket (211).

[0040] The locking component (400) is provided with a stud (410) and a pressure plate (420). The pressure plate (420) is fixed to the outside of the self-locking clamp (120), and the stud (410) passes through the operating shaft hole (160). The pressure plate (420) and the self-locking clamp (120) can be fixed with screws or welded. In this embodiment, the pressure plate (420) is fixed to the outside of the self-locking clamp by fixing screws (430).

[0041] The operating handle (200) is mounted on the handle holder (100), and the drive head (210) is connected to the stud (410) passing through the self-locking jaw, i.e., the threaded connection between the screw hole (212) and the stud (410). When the operating handle is in the initial position (e.g.) Figure 1 , Figure 3(as shown in the position), the axis (240) of the operating handle is parallel to the center line (113) connecting the operating sleeve (110) and the drive head (210), and the axis (143) of the spring sleeve (140) is inclined to the center line (113) connecting the operating sleeve and the drive head, so that the spring sleeve avoids conflict with the operating sleeve in structure.

[0042] like Figures 9 to 12 This illustrates the operation process of the torque-limiting self-locking operating device installed on a valve in this embodiment. The valve can be a common ball valve or butterfly valve, whose valve stem rotates within a 90° stroke to achieve the opening and closing operation of the valve. When the operating handle is in the initial position, as... Figure 9 As shown (or as Figure 1 , Figure 3 (As shown in the diagram), the pressure spring (130) presses the pressure ball (230) into the drive ball socket (211) of the drive head, enabling the operating handle (200) to rotate the handle holder (100). The pressure spring (130) and the pressure ball (230) limit the driving torque of the operating handle on the handle holder. Figure 10 As shown, when the operating handle (200) is rotated 90° in the valve closing direction, the handle holder (100) drives the valve stem to rotate. When the valve reaches the closed position, the valve stem will stop rotating. Figure 11 As shown, if the operating handle continues to be rotated in the closing direction, and the driving torque of the operating handle exceeds the limit, the operating handle will squeeze the pressure ball (230) out of the drive ball socket (211), and the operating handle (200) will rotate relative to the handle holder (100), causing the pressure ball (230) to enter the reset groove (213). Figure 12 As shown, the operating handle is continuously pushed to rotate in the closing direction, and the top pressure ball (230) passes over the reset groove (213) and enters the locking groove (214) to prevent the operating handle from loosening. During the rotation of the operating handle (200) relative to the handle holder (100), the screw hole (212) of the operating handle rotates relative to the stud (410) of the locking member. Through the threaded transmission, the locking member (400) is driven to move axially. The pressure plate (420) of the locking member presses the self-locking clamp (120), and the self-locking clamp (120) clamps the locking plate (300), realizing the position locking of the torque-limiting self-locking operating device and locking the valve stem in the closed position.

[0043] The valve opening operation is the reverse process of the closing operation. The operating handle (200) rotates in the opening direction, causing the top-pressure ball (230) to disengage from the locking groove (214), enter the reset groove (213), and then enter the drive ball socket (211). During this process, the operating handle (200) rotates relative to the handle holder (100), and the screw hole (212) of the operating handle rotates relative to the stud (410) of the locking element. Through the threaded transmission, this drives the locking element (400) to move axially, causing the pressure plate (420) of the locking element to disengage from the self-locking clamp (120), and the self-locking clamp (120) to disengage from the locking plate (300), thus unlocking the torque-limiting self-locking operating device. During this process, the reset groove (213) helps the top-pressure ball (230) enter the drive ball socket (211), preventing the top-pressure ball (230) from failing to enter the drive ball socket (211) and causing the handle holder (100) to rotate the valve stem. As the operating handle continues to rotate in the opening direction, the handle holder (100) drives the valve stem to rotate, reaching the valve's open position.

[0044] In this embodiment, the locking disc (300) adopts a butterfly spring-shaped structure. When the self-locking clamp (120) clamps the locking disc, it can moderately increase the elastic deformation of the locking disc. During the rotation of the operating handle (200) relative to the handle holder (100), it reduces the impact of operation and the stiff feel, improving the operating experience. During the opening operation, the self-locking clamp can maintain appropriate contact with the locking disc, so that the operating handle (200) is in a semi-engaged state, avoiding the phenomenon that the operating handle is not reset, the self-locking clamp has released the locking disc, and the valve stem rotates freely. In conjunction with the reset groove (213) and locking groove (214) structure of the drive head, the valve opening operation can be completed smoothly.

[0045] Example 2:

[0046] like Figure 7 , Figure 8 A torque-limiting self-locking operating device is described in this embodiment, which is a structural replacement of the torque-limiting self-locking operating device in Embodiment 1.

[0047] In this embodiment, the drive head (210) is provided with a screw hole (212), the locking member (400) is provided with a stud (410) and a pressure plate (420), the handle frame (100) is provided with a locking guide hole (170), the pressure plate is provided with a locking guide pin (440), the tail of the locking guide pin is a bolt structure (441), the locking guide pin (440) is fixed on the pressure plate (420) by the bolt structure (441), and the locking guide pin (440) restricts the rotation of the locking member (400). The locking guide pin (440) slides with the locking guide hole (170). When the operating handle (200) rotates relative to the handle frame, the drive head (210) drives the pressure plate (420) to press the locking plate (300) through the threaded engagement.

[0048] This embodiment simplifies the structure of the handle holder and eliminates the self-locking clamp (120). The pressure plate (420) of the locking member (400) directly presses against the locking plate (300) to achieve the position locking of the torque-limiting self-locking operating device.

[0049] Example 3:

[0050] A torque-limiting self-locking operating device is disclosed in this embodiment, which is an application example of the torque-limiting self-locking operating device of Embodiment 1 in a forced-sealing valve. This embodiment takes the Chinese invention patent "A valve stem operating device for a forced-sealing valve" (publication number CN112361012A) as an example.

[0051] This article provides a brief overview of the structure and function of "A Forced Sealing Valve Stem Operating Device". More detailed technical features can be found in the published patent documents.

[0052] like Figure 14 , Figure 15 As shown, the forced sealing valve stem operating device includes a valve body (10), a valve stem (20), an upper valve disc drive (30), a lower valve disc drive (40), and a valve core (70).

[0053] A valve cover (1A) is provided on the upper side of the valve body, and the valve stem is installed in the shaft hole 14 of the valve cover. A flow channel 71 is provided in the center of the valve core. An upper drive shaft (72) is provided at the upper end of the valve core, and a lower drive shaft (73) is provided at the lower end of the valve core. The upper drive shaft and the lower drive shaft are provided with threads with opposite directions of rotation, and the valve stem drives the valve core to rotate synchronously.

[0054] The upper valve disc drive (30) and the lower valve disc drive (40) are respectively disposed on both sides of the flow channel of the valve core. The upper valve disc drive is threadedly connected to the upper drive shaft of the valve core, and the lower valve disc drive is threadedly connected to the lower drive shaft of the valve core. When the valve stem rotates relative to the upper and lower valve disc drive, the valve core drives the upper and lower valve disc drive to move in opposite directions through the thread. The upper and lower valve disc drive drive the sealing valve disc (80) to press against the valve seat (90), thereby achieving forced sealing of the valve.

[0055] In this example, the forced-sealing valve uses a valve stem actuation device to open and close the valve. The valve stem completes the opening or closing operation within one rotation stroke. The valve stem drives the upper valve disc actuator to rotate within the valve's opening and closing stroke. In the closed position, the valve stem also rotates relative to the upper valve disc actuator, driving both the upper and lower valve disc actuators to move along the valve stem axis, thus completing the forced-sealing operation.

[0056] The valve closing operation process is as follows: the valve stem drives the upper and lower valve disc drive components to rotate in the closing direction from the open position. The upper and lower valve disc drive components rotate 90° to reach the closed position. The upper and lower valve disc drive components drive the two sealing valve discs to align with the valve seats at both ends of the valve. The valve stem continues to rotate in the closing direction, and the upper drive shaft (72) and lower drive shaft (73) of the valve core generate relative rotation with the upper and lower valve disc drive components. The upper and lower valve disc drive components drive the sealing valve discs to move towards the valve seat and press against the valve seat, thus realizing the valve closing and forced sealing. The valve stem can no longer continue to rotate in the closing direction.

[0057] The valve opening operation is the reverse of the closing operation. The valve stem rotates from the forced sealing position to the open position in one go, completing the release of the forced seal and the opening of the valve in sequence.

[0058] During the valve operation described above, the valve stem rotates from the open position to the closed position. After reaching the closed position, the stem must continue to rotate in the closing direction to complete the forced sealing rotation stroke. Excessive valve stem closing torque will damage valve components, while insufficient torque will prevent valve sealing. After completing the forced sealing rotation stroke, the valve may retract due to the internal transmission chain (such as threads or drive ramps) not self-locking, causing the threads and valve stem to rotate back, thus failing to maintain the forced sealing state. Furthermore, after completing the forced sealing rotation stroke, the valve stem phase may not remain at the normal closed position (90° relative to the open position), and may even overlap with the open position. This makes it difficult for valve operators to judge the valve's open / closed status, potentially leading to misoperation.

[0059] like Figure 13 In this embodiment, the torque-limiting self-locking operating device described in Embodiment 1 is installed on the forced sealing valve. The locking disc (300) is fixed on the valve cover 1A, and the operating bushing (110) is sleeved on the valve stem (20).

[0060] The valve closing operation process is as follows: the operating handle (200) drives the valve stem (20) from the open position to the closed position through the handle holder (100). Figure 9 The position of the valve handle indicates the valve's open state. Figure 10 The position of the operating handle is displayed when the valve stem reaches the closed position. After the valve stem (20) rotates to the closed position, the operating handle (200) needs to continue rotating in the closing direction to drive the valve stem to complete the rotational stroke for forced sealing, such as... Figure 16As shown. After the forced sealing rotation stroke is completed, the operating handle does not remain in the normal valve closed position, i.e., 90° relative to the open position. In this embodiment, the valve self-locking operating handle described in Embodiment 1 is used. After the valve stem completes the forced sealing valve sealing operation, the operating handle (200) is pushed forcefully in the closing direction. The operating handle continues to rotate relative to the handle holder for a locking stroke, so that the self-locking clamp (120) clamps the locking disc, thereby fixing the handle holder (100) and locking the valve stem in the sealing position, as shown. Figure 17 As shown, this ensures the valve remains reliably sealed, and the rotational position of the operating handle relative to the handle holder clearly indicates that the valve is in the sealed position.

[0061] In this embodiment, the locking disc (300) adopts a butterfly spring-shaped structure. During the locking stroke of the operating handle (200) rotating relative to the handle bracket (100), the self-locking clamp (120) can maintain appropriate contact with the locking disc, so that the operating handle (200) is in a semi-engaged state. The handle bracket maintains a certain torque on the valve stem to prevent the valve stem from retracting in the opening direction.

[0062] The valve opening operation process is as follows: rotate the operating handle in the opening direction to first return the operating handle to its initial position relative to the handle holder, thereby releasing the self-locking clamp from the locking disc. Then, the operating handle drives the valve stem to rotate in the opening direction, thus completing the release of the forced seal and the opening of the valve in sequence.

[0063] Therefore, this invention is particularly suitable for the opening and closing operation of forced sealing valves, and can infinitely adjust the valve closing torque to prevent valve parts from being overloaded; it can reliably lock the valve in the sealed position to prevent the valve from loosening; and it can also clearly indicate the sealing and opening status of the valve.

[0064] The torque-limiting self-locking operating device of the present invention can be used not only for valve operating mechanisms, but also for other types of operating devices that require limiting operating torque and maintaining self-locking, such as locking operating devices for precision bench vises or clamps.

Claims

1. A torque-limiting self-locking operating device for a rotary operating mechanism, wherein the rotary operating mechanism is provided with an operating shaft, characterized in that, The device includes a handle holder (100), an operating handle (200), a locking disc (300), and a locking element (400). The locking disc (300) is fixed on the rotary operating mechanism. The handle holder is provided with an operating bushing (110), which is sleeved on the operating shaft (20) and drives the operating shaft (20) to rotate. The operating handle (200) is provided with a drive head (210). When the handle holder (100) and the operating shaft (20) stop rotating, the drive head (210) drives the locking element (400) to press the locking disc (300) through a helical engagement. The handle holder is provided with a top pressure spring (130), and the drive head is provided with a drive ball socket (211). The top pressure spring (130) presses the drive ball socket (211) through a top pressure ball (230).

2. The torque-limiting self-locking operating device according to claim 1, characterized in that, The drive head (210) is provided with a screw hole (212), and the locking member (400) is provided with a stud (410). When the operating handle rotates relative to the handle frame, the drive head (210) drives the locking member (400) through threaded engagement.

3. The torque-limiting self-locking operating device according to claim 1, characterized in that, The handle is provided with a self-locking clamp (120), the locking disc (300) is embedded in the self-locking clamp, the drive head (210) drives the locking member (400) to press the self-locking clamp (120), and the self-locking clamp (120) clamps the locking disc (300).

4. The torque-limiting self-locking operating device according to claim 3, characterized in that, The locking member (400) is provided with a pressure plate (420), which is fixed to the outside of the self-locking clamp. The driving head (210) drives the pressure plate (420) to press the self-locking clamp (120).

5. The torque-limiting self-locking operating device according to claim 1, characterized in that, The locking component (400) is provided with a pressure plate (420), the handle bracket is provided with a locking guide hole (170), the pressure plate is provided with a locking guide pin (440), the locking guide pin (440) slides with the locking guide hole (170), and the driving head (210) drives the pressure plate (420) to press the locking plate (300).

6. The torque-limiting self-locking operating device according to claim 1, characterized in that, The drive ball socket (211) is a spherical groove corresponding to the top pressure ball (230). The drive head is provided with a reset ramp (213) and a locking ramp (214). The reset ramp (213) and the locking ramp (214) are arc-shaped grooves corresponding to the top pressure ball (230). The depth of the drive ball socket (211) is greater than that of the reset ramp (213). When the operating handle is rotated in the locking direction, the top pressure ball (230) enters the reset ramp (213) and the locking ramp (214) in sequence. The reset ramp (213) is provided with a slope that causes the top pressure ball (230) to move toward the drive ball socket (211). The locking ramp (214) is provided with a slope that causes the top pressure ball (230) to move away from the drive ball socket (211).

7. The torque-limiting self-locking operating device according to claim 1, characterized in that, The handle is provided with a spring sleeve (140), and the top pressure spring (130) is disposed inside the spring sleeve (140).

8. The torque-limiting self-locking operating device according to claim 1, characterized in that, The locking disc (300) is a spring-shaped locking disc.

9. The torque-limiting self-locking operating device according to claim 1, characterized in that, The locking disc is fixed to the rotary operating mechanism by screws (310).

10. A torque-limiting self-locking operating device according to claim 1, characterized in that, The torque-limiting self-locking operating device is an operating device installed on a forced-sealing ball valve. The rotary operating mechanism includes a valve cover (1A), an operating shaft (20) which is a valve stem, a locking disc fixed on the valve cover (1A), and an operating shaft sleeve (110) fitted on the valve stem (20) and driving the valve stem to rotate. During the stroke of the valve stem (20) driving the valve core (70) to rotate from the open position to the closed position, the operating handle (200) rotates synchronously with the handle bracket (100) and the valve stem (20) under the action of the top pressure spring (130). When the valve core is in the closed position, the operating handle continues to drive the handle bracket and the valve stem to rotate in the closing direction and drives the sealing valve disc (80) to press against the valve seat (90). After that, the handle bracket and the valve stem stop rotating, and the operating handle overcomes the force of the top pressure spring and rotates relative to the handle bracket, driving the locking member (400) to press against the locking disc (300).

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