Thread tightening device and method for low-temperature valve

Abstract

The thread tightening device comprises a top seat, two valve clamping claws are installed in a bottom groove of the top seat, valve clamping claw driving motors are installed on the side edges of the valve clamping claws, and the valve clamping claws can slide in the bottom groove of the top seat under driving of the valve clamping claw driving motors. And the valve is clamped by the valve clamping claw. And the base is fixed on the ground, and a groove is formed in the base, so that the valve placed in the groove can be limited and does not slide. Two guide rails are fixed to the left side and the right side of the base, sliding blocks are arranged on the guide rails respectively, and the tightening support is fixed to the two sliding blocks and can slide on the guide rails along with the sliding blocks. The tightening shaft driving motor is fixed on the tightening shaft support, the tightening shaft penetrates through the tightening shaft support, the nut clamp is fixed at the top end of the tightening shaft and clamps the nut, and the tightening shaft driving motor can drive the tightening shaft to rotate and move back and forth, so that the purpose of tightening or removing the nut is achieved. The lower end of the tightening shaft support is provided with the lead screw, and the lead screw is driven by the lead screw driving motor to move back and forth in the axial direction of the guide rail, so that all components on the tightening shaft support are driven to move together, and the purpose that the nut gets close to the valve is achieved. The limiting device is installed on the guide rail, and after the tightening shaft support is in place, the lead screw driving motor stops working. According to the invention, valve joint thread butt joint, tightening and torque application can be realized, valve thread tightening under normal temperature and low temperature conditions can be met, the risk of injury to operators caused by valve assembly in a low temperature environment is avoided, the assembly quality is ensured, and the test capability is improved.

Description

Technical Field

[0001] The invention relates to a thread tightening device and method for a cryogenic valve, belonging to the technical field of thread assembly in a cryogenic environment. Background Art

[0002] When testing low-temperature valves, the valves are generally threaded. When switching between tests, the product at low temperature is involved in getting on and off the stage. In the traditional process, operators wear gloves to operate, or wait for the product to warm up before operating. In the former case, wearing gloves increases the difficulty of operation, and the low temperature also poses a risk to the health and safety of operators. In the latter case, the warming process increases the total test time and reduces the test efficiency. Both assembly quality and efficiency will be affected, which in turn affects the test efficiency. Summary of the invention

[0003] The present invention provides a thread tightening device and method for cryogenic valves, which can realize the thread connection, tightening and torque application of valve joints, and can meet the requirements of valve thread tightening under normal temperature and low temperature conditions.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: the threaded tightening device includes a top seat, a valve clamping claw, a valve clamping claw driving cylinder, and a valve; there is a groove at the bottom of the top seat, and the valve clamping claw driving cylinder is located on the side of the valve clamping claw, and the valve clamping claw driving cylinder can drive the valve clamping claw to slide in the groove at the bottom of the top seat until the valve clamping claw clamps or releases the valve.

[0005] The threaded tightening device also includes a base; the base has a groove to ensure that the valve placed thereon is limited and does not slide.

[0006] The thread tightening device also includes a nut clamp, a tightening shaft, a tightening shaft support, a tightening shaft drive motor, a guide rail, and a nut; The tightening shaft driving motor is fixed on the tightening shaft support, the tightening shaft passes through the tightening shaft support, the nut is clamped and fixed on the top end of the tightening shaft to clamp the nut, and the tightening shaft driving motor can drive the tightening shaft to rotate and move forward and backward, thereby achieving the purpose of tightening or removing the nut.

[0007] The thread tightening device also includes a limit device, a slider, a lead screw, and a lead screw drive motor; the lead screw is installed at the lower end of the tightening shaft support, and the lead screw can move forward and backward along the guide rail axis under the drive of the lead screw drive motor, thereby driving all parts on the tightening shaft support to move together, so as to achieve the purpose of bringing the nut close to the valve. The limit device is installed on the guide rail, and the lead screw drive motor stops working after the tightening shaft support is in place.

[0008] The present invention also provides a thread tightening method based on the above-mentioned threaded device, wherein the lead screw driving motor drives the lead screw to move forward along the guide rail axis, thereby moving all the components on the tightening shaft support together, until the tightening shaft support hits the limit device, then the lead screw driving motor stops working, and the tightening shaft support is in place. Then the tightening shaft driving motor drives the tightening shaft to rotate and move axially forward until the nut contacts the valve, the tightening shaft driving motor first slowly reverses to align the nut and the valve thread, and then slowly rotates forward to lock the nut and the valve thread, and tightens at a uniform speed until the specified torque is reached.

[0009] The beneficial technical effect of the present invention is that it can realize automatic docking, tightening and torque application of valve joint threads, can meet the tightening of valve threads under normal temperature and low temperature conditions, effectively avoid the safety risks of personnel operation in low temperature environment, and the problems of low assembly quality and efficiency caused by manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings described herein are provided to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 A front view of a thread tightening device provided by an embodiment of the present invention; Figure 2 A left side view of a thread tightening device provided by an embodiment of the present invention; Figure 3 A top view of a thread tightening device provided in one embodiment of the present invention.

[0011] Figure Number: 1. Top seat; 2. Valve clamping claw; 3. Valve clamping claw driving cylinder; 4. Valve; 5. Base; 6. Nut clamping; 7. Tightening shaft; 8. Tightening shaft support; 9. Tightening shaft driving motor; 10. Guide rail; 11. Nut; 12. Limiting device; 13. Slider; 14. Screw; 15. Screw driving motor DETAILED DESCRIPTION

[0012] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings and embodiments, so as to fully understand and implement how the present invention applies technical means to solve technical problems and achieve the implementation process of technical effects. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined, and the technical solutions formed are all within the protection scope of the present invention.

[0013] Additionally, the steps shown in the figures may be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown, in some cases, the steps shown or described may be performed in an order different from this.

[0014] Please refer to Figure 1 As shown, a threaded tightening device for a valve provided by the present invention includes a top seat 1, a valve clamping claw 2, a valve clamping claw driving cylinder 3, and a valve 4; the top seat 1 has a groove at the bottom, the valve clamping claw driving cylinder 3 is located on the side of the valve clamping claw 2, and the valve clamping claw driving cylinder 3 can drive the valve clamping claw 2 to slide in the groove at the bottom of the top seat 1 until the valve clamping claw 2 clamps or releases the valve 4.

[0015] In the above embodiment, the threaded tightening device further comprises a base 5; the base 5 has a groove to ensure that the valve 4 placed thereon is limited in position and does not slide.

[0016] In the above embodiment, the threaded tightening device also includes a nut clamp 6, a tightening shaft 7, a tightening shaft support 8, a tightening shaft drive motor 9, a guide rail 10, and a nut 11; the tightening shaft drive motor 9 is fixed on the tightening shaft support 8, the tightening shaft 7 passes through the tightening shaft support 8, the nut clamp 6 is fixed on the top of the tightening shaft 7, clamping the nut 11, and the tightening shaft drive motor 9 can drive the tightening shaft 7 to rotate and move forward and backward, thereby achieving the purpose of tightening or removing the nut 11.

[0017] In the above embodiment, the threaded tightening device further includes a limit device 12, a slider 13, a lead screw 14, and a lead screw drive motor 15; the lead screw 14 is mounted at the lower end of the tightening shaft support 8, and the lead screw 14 can move forward and backward along the axial direction of the guide rail 10 under the drive of the lead screw drive motor 15, thereby driving all components on the tightening shaft support 8 to move together, so as to achieve the purpose of bringing the nut 11 close to the valve 4. The limit device 12 is mounted on the guide rail 10, and after the tightening shaft support 8 is in place, the lead screw drive motor 15 stops working.

[0018] In summary, please refer to Figure 1 As shown, a threaded tightening device for a cryogenic valve provided by the present invention as a whole comprises a top seat 1, a valve clamping claw 2, a valve clamping claw driving cylinder 3, a valve 4, a base 5, a nut clamp 6, a tightening shaft 7, a tightening shaft support 8, a tightening shaft driving motor 9, a guide rail 10, a nut 11, a limit device 12, a slider 13, a screw 14, and a screw driving motor 15.

[0019] The thread tightening method based on the above thread device is as follows: The screw drive motor drives the screw to move forward along the guide rail axis, thereby moving all the components on the tightening shaft support together, until the tightening shaft support hits the limit device, then the screw drive motor stops working, and the tightening shaft support is in place. Then the tightening shaft drive motor drives the tightening shaft to rotate and move axially until the nut contacts the valve, the tightening shaft drive motor first slowly reverses to align the nut and the valve thread, and then slowly rotates forward to lock the nut and the valve thread, and tightens at a uniform speed until the specified torque is reached.

[0020] The beneficial technical effect of the present invention is that it can realize automatic docking, tightening and torque application of valve joint threads, can meet the tightening of valve threads under normal temperature and low temperature conditions, effectively avoid the safety risks of personnel operation in low temperature environment, and the problems of low assembly quality and efficiency caused by manual operation.

[0021] The specific embodiments described above further explain the purpose, technical solutions and effective effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thread tightening device for cryogenic valves, characterized in that: The thread tightening device comprises a top seat, a valve clamping claw, a valve clamping claw driving cylinder, and a valve; The bottom of the top seat is provided with a groove, and the valve clamping claw driving cylinder is located on the side of the valve clamping claw. The valve clamping claw driving cylinder can drive the valve clamping claw to slide in the groove at the bottom of the top seat until the valve clamping claw clamps or releases the valve.

2. The thread tightening device for cryogenic valves according to claim 1, characterized in that: The thread tightening device also includes a base; The base has a groove to ensure that the valve placed thereon is limited and does not slide.

3. The thread tightening device for cryogenic valves according to claim 1, characterized in that: The thread tightening device also includes a nut clamp, a tightening shaft, a tightening shaft support, a tightening shaft drive motor, a guide rail, and a nut; The tightening shaft driving motor is fixed on the tightening shaft support, the tightening shaft passes through the tightening shaft support, the nut is clamped and fixed on the top end of the tightening shaft to clamp the nut, and the tightening shaft driving motor can drive the tightening shaft to rotate and move forward and backward, thereby achieving the purpose of tightening or removing the nut.

4. The thread tightening device for cryogenic valves according to claim 3, characterized in that: The thread tightening device also includes a limit device, a slider, a lead screw, and a lead screw drive motor; The screw is installed at the lower end of the tightening shaft support. The screw can move forward and backward along the guide rail axis under the drive of the screw drive motor, thereby driving all parts on the tightening shaft support to move together, so as to achieve the purpose of bringing the nut close to the valve. The limit device is installed on the guide rail, and the screw drive motor stops working after the tightening shaft support is in place.

5. The method for tightening a thread of a cryogenic valve according to the thread tightening device for a cryogenic valve according to claims 1 to 4, characterized in that: The screw drive motor drives the screw to move forward along the guide rail axis, thereby moving all the components on the tightening shaft support together, until the tightening shaft support hits the limit device, then the screw drive motor stops working, and the tightening shaft support is in place. Then the tightening shaft drive motor drives the tightening shaft to rotate and move axially until the nut contacts the valve, the tightening shaft drive motor first slowly reverses to align the nut and the valve thread, and then slowly rotates forward to lock the nut and the valve thread, and tightens at a uniform speed until the specified torque is reached.

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