Underwater plugging test device for multi-path hydraulic connector

Abstract

The utility model relates to the technical field of connector plugging test, in particular to an underwater plugging test device for a multi-path hydraulic connector, which comprises a support plate, a hyperbaric cabin fixed at the top of the support plate, a liquid nitrogen box and a water pump arranged at the left end of the hyperbaric cabin, a gas tank arranged at the right end of the hyperbaric cabin, a connecting plate arranged inside the hyperbaric cabin, and a water pump arranged at the right end of the connecting plate. The top of the connecting plate is fixedly provided with a positioning block, the top of the positioning block is provided with a connector fixing end, the right end of the connector fixing end is fixedly connected with a connector moving end, the left end of the connector fixing end is provided with a torsion testing machine, and the exterior of the connector moving end is provided with an adaptive ring; according to the utility model, normal operation of plugging and separating functions in a simulated complex environment can be ensured, and the performance of the multi-path hydraulic connector can be reflected more truly, so that the problems of high risk and low efficiency of traditional underwater operation are solved, automatic testing is realized through a remote control system, the testing efficiency is improved, and personal errors are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of connector insertion and removal testing technology, specifically a multi-channel hydraulic connector underwater insertion and removal testing device. Background Technology

[0002] Subsea plugging and unplugging requires reliable sealing and fluid transmission in harsh environments such as high pressure and low temperature. Multi-channel hydraulic connectors (MQCs), as transmission devices for hydraulic fluids, alcohol injections, and chemicals between subsea production trees, subsea manifolds, and subsea distribution units, are essential core equipment in the development and operation of subsea oil and gas fields. MQCs consist of a moving end and a fixed end, with the moving end operated by the ROV to mate with the fixed end on the production tree. Their performance and reliability directly affect the safe operation of the entire system. Therefore, plugging and unplugging tests are required before use.

[0003] However, existing testing devices typically operate at ambient temperature and pressure, resulting in low testing accuracy. Furthermore, most existing testing methods are performed manually, leading to low testing efficiency and accuracy. To address these issues, this invention presents a multi-channel hydraulic connector underwater insertion and removal testing device. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a multi-channel hydraulic connector underwater insertion and removal testing device, which effectively solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-channel hydraulic connector underwater insertion and removal testing device, comprising a support plate, a high-pressure chamber fixed to the top of the support plate, a liquid nitrogen tank at the left end of the high-pressure chamber, a liquid nitrogen pipe fixed to the outside of the high-pressure chamber, a gas tank at the right end of the high-pressure chamber, a door fastened to the top of the high-pressure chamber by bolts, a water pump fixed to the left end of the high-pressure chamber, a connecting plate inside the high-pressure chamber, a positioning block fixed to the top of the connecting plate, a connector fixing end at the top of the positioning block, a connector moving end fastened to the right end of the connector fixing end, a torque rod blind plate at the left end of the connector fixing end, a torsion testing machine rotatably connected to the left end of the torque rod blind plate, an adapter ring outside the connector moving end, several clamping rods fixed on the adapter ring, a positioning plate fixed to the bottom of the adapter ring, a moving plate fixed to the left end of the positioning plate, and a moving rod slidably connected inside the moving plate.

[0006] Preferably, a controller is fixed to the top of the support plate, a power supply is fixed to the rear end of the controller, a temperature sensor is fixed to the left end of the high-pressure chamber, a pressure sensor is fixed to the top of the temperature sensor, a water inlet valve is fixed to the left end of the water pump, an air pump is fixed to the left end of the air tank, an air valve is fixed to the left end of the air pump, and the air valve is fixedly connected to the high-pressure chamber through a pipe.

[0007] Preferably, a liquid nitrogen pump is fixed to the top left end of the support plate, a liquid nitrogen inlet valve is fixed to the right end of the liquid nitrogen pump, the liquid nitrogen inlet valve is fixedly connected to the beginning end of the liquid nitrogen pipe, a liquid nitrogen outlet valve is fixed to the end of the liquid nitrogen pipe, and the left end of the liquid nitrogen outlet valve is fixedly connected to the liquid nitrogen tank through a pipe.

[0008] Preferably, the high-pressure chamber is fastened to the connecting plate inside it by bolts. A positioning strip is fixed to the top of the connecting plate, and a positioning disc is fastened to the inner side of the positioning strip. The positioning disc is fixedly connected to the torsion testing machine inside it. A connecting disc is fastened to the right end of the torque rod blind plate. The connecting disc is fixedly connected to the connector fixing end on its right end. A clamping ring is tightly fitted to the outside of the connector fixing end. A support block is fastened to the bottom of the clamping ring by bolts. The support block is fixedly connected to the positioning block at its bottom.

[0009] Preferably, a connecting strip is fixed to the top of the connecting plate, a positioning head is fixed to the right end of the connecting strip, the positioning head is hinged to the moving rod inside it, a moving head is fixed to the right end of the moving rod, the moving head is slidably connected to the slide groove on the moving plate, two moving blocks are fixed to the bottom of the positioning plate, a moving rail is slidably connected to the bottom of each moving block, each moving rail is fixedly connected to the connecting plate at its bottom, a clamping plate is fixed to the inner side of each clamping rod, and each clamping plate is in close contact with the moving end of the connector inside it.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention uses a high-pressure chamber to position the connecting plate. A water pump and an inlet valve work together to deliver clean water from outside into the high-pressure chamber, thus facilitating the simulation of an underwater environment. At the same time, an air pump and an air valve work together to deliver gas from inside the air tank into the high-pressure chamber, thereby changing the internal pressure of the high-pressure chamber and facilitating the simulation of an underwater environment, thus ensuring the accuracy and effectiveness of the test.

[0012] This invention uses a liquid nitrogen pump and a liquid nitrogen inlet valve to transport liquid nitrogen from the liquid nitrogen tank to the liquid nitrogen tube. The liquid nitrogen outlet valve allows the liquid nitrogen to flow back. At the same time, the liquid nitrogen tube reduces the temperature of the high-pressure chamber, thus simulating underwater temperature, ensuring the accuracy of the test and improving the test efficiency. In addition, the device uses a hatch to keep the high-pressure chamber sealed, further ensuring the accuracy of the test.

[0013] This invention utilizes a torsion testing machine to rotate the torque rod blind plate, thereby rotating the fixed end of the connector and causing the moving end of the connector to move to the right, simulating a torsion situation and ensuring test accuracy. Since the moving head moves on the track of the moving plate, the moving rod remains stationary, ensuring the stability of the entire device. Simultaneously, the extension and retraction of the moving rod can move the positioning plate, allowing for testing of insertion and removal, thus ensuring test accuracy. Furthermore, this device ensures normal operation of insertion and separation functions under simulated complex environments, more realistically reflecting the performance of multi-channel hydraulic connectors. This device solves the pain points of high risk and low efficiency in traditional underwater operations, achieving automated testing through a remote control system, improving testing efficiency and reducing human error. Attached Figure Description

[0014] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall rear end of this utility model;

[0018] Figure 3 This is a schematic diagram of the inside of the liquid nitrogen tank of this utility model;

[0019] Figure 4 This is a schematic diagram of the interior of the housing of this utility model;

[0020] Figure 5 This is a cross-sectional view of the box body of this utility model;

[0021] Figure 6 This is a schematic diagram of the top of the connecting plate of this utility model;

[0022] Figure 7 This is a schematic diagram of the inner side of the connecting strip of this utility model;

[0023] Figure 8 This is a schematic diagram of the internal structure of the adapter ring of this utility model.

[0024] In the diagram: 1-Support plate; 2-Liquid nitrogen tank; 3-Water pump; 4-Gas tank; 5-Connecting plate; 6-Positioning block; 7-Moving rod; 8-Torsion testing machine; 101-Controller; 102-Power supply; 103-High-pressure chamber; 104-Door; 105-Temperature sensor; 106-Pressure sensor; 107-Camera; 201-Liquid nitrogen pipe; 202-Liquid nitrogen pump; 203-Liquid nitrogen inlet valve; 204-Liquid nitrogen outlet valve; 301-Water inlet valve; 302-Water outlet valve; 401 - Air pump; 402 - Air valve; 501 - Moving rail; 502 - Positioning bar; 601 - Support block; 602 - Clamping ring; 701 - Connecting bar; 702 - Positioning head; 703 - Moving plate; 704 - Moving head; 801 - Positioning disc; 802 - Torque rod blind plate; 803 - Connecting disc; 804 - Connector fixed end; 805 - Connector moving end; 806 - Adapter ring; 807 - Clamping rod; 808 - Positioning plate; 809 - Moving block; 810 - Clamping plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Example 1, by Figures 1-2 , Figures 4-6The present invention includes a support plate 1 made of alloy material, which supports the entire device. A high-pressure chamber 103, also made of alloy material, is fixed to the top of the support plate 1 and is used to position the connecting plate 5. A liquid nitrogen tank 2, made of alloy material, is located at the left end of the high-pressure chamber 103, providing liquid nitrogen to the liquid nitrogen pipe 201. A liquid nitrogen pipe 201, also made of alloy material, is fixed to the outside of the high-pressure chamber 103 and is used to reduce the temperature of the high-pressure chamber 103. 3. A gas tank 4 is provided at the right end, which is used to hold the required gas. A hatch 104 is bolted to the top of the high-pressure chamber 103. The hatch 104 is made of alloy material and is used to ensure the airtightness of the high-pressure chamber 103. A water pump 3 is also fixed at the left end of the high-pressure chamber 103. A connecting plate 5 is provided inside the high-pressure chamber 103. The connecting plate 5 is used to position the positioning strip 502. A positioning block 6 is fixed to the top of the connecting plate 5. The positioning block 6 is made of alloy material and is used to position the support block 601. A connector is provided on the top of the positioning block 6. The connector has a fixed end 804, and a connector movable end 805 is fastened to the right end of the fixed end 804. A torque rod blind plate 802, made of alloy material, is provided on the left end of the fixed end 804. A torsion testing machine 8 is rotatably connected to the left end of the torque rod blind plate 802, which can drive the torque rod blind plate 802 to rotate. An adapter ring 806, also made of alloy material, is provided on the outside of the connector movable end 805. The adapter ring 806 is used to position the clamping rods 807, and several clamping rods 807 are fixed on the adapter ring 806. The clamping rod 807 is telescopic, thereby driving the clamping plate 810 to move and thus positioning the connector moving end 805. A positioning plate 808 is fixed to the bottom of the adapter ring 806. The positioning plate 808 is made of alloy material and is used to position the adapter ring 806. A moving plate 703 is fixed to the left end of the positioning plate 808. The moving plate 703 is made of alloy material and is used to position the moving rod 7. The moving rod 7 is slidably connected inside the moving plate 703. The moving rod 7 is telescopic, thereby driving the positioning plate 808 to move.

[0027] Example 2, based on Example 1, combined with... Figure 3 , Figures 7-8As shown, a controller 101 is fixed to the top of the support plate 1, which controls the entire device. A power supply 102 is fixed to the rear end of the controller 101, providing the necessary power to the entire device. A temperature sensor 105 is fixed to the left end of the high-pressure chamber 103, which monitors the internal temperature of the high-pressure chamber 103. A pressure sensor 106 is fixed to the top of the temperature sensor 105, which monitors the internal pressure of the high-pressure chamber 103. A water inlet valve 301 is fixed to the left end of the water pump 3. The water pump 3 and the water inlet valve 301 work together to deliver external clean water into the high-pressure chamber 103, thereby facilitating the simulation of an underwater environment. The gas tank 4... An air pump 401 is fixed to the left end, and an air valve 402 is fixed to the left end of the air pump 401. The air pump 401 and the air valve 402 work together to transport the gas inside the gas tank 4 to the high-pressure chamber 103, thereby changing the internal pressure of the high-pressure chamber 103 to facilitate the simulation of an underwater environment. The air valve 402 is fixedly connected to the high-pressure chamber 103 through a pipe. A liquid nitrogen pump 202 is fixed to the top of the left end of the support plate 1, and a liquid nitrogen inlet valve 203 is fixed to the right end of the liquid nitrogen pump 202. The liquid nitrogen pump 202 and the liquid nitrogen inlet valve 203 can transport liquid nitrogen from the liquid nitrogen tank 2 to the liquid nitrogen pipe 201. The liquid nitrogen can be refluxed through the liquid nitrogen outlet valve 204. The liquid nitrogen inlet valve 203 and the liquid nitrogen pipe... The liquid nitrogen pipe 201 is fixedly connected at its head end. A liquid nitrogen outlet valve 204 is fixedly fixed at the end of the liquid nitrogen pipe 201. The left end of the liquid nitrogen outlet valve 204 is fixedly connected to the liquid nitrogen tank 2 via a pipe. The high-pressure chamber 103 is fastened to the connecting plate 5 inside it by bolts. A positioning strip 502 is fixed to the top of the connecting plate 5. The positioning strip 502 is made of alloy material and is used to position the positioning plate 801. The positioning plate 801 is fastened to the inner side of the positioning strip 502. The positioning plate 801 is made of alloy material and is used to position the torsion testing machine 8. The positioning plate 801 is fixedly connected to the torsion testing machine 8 inside it. The right end of the torque rod blind plate 802 is fastened to a connecting... The connecting plate 803, made of alloy material, is used to position the connector fixing end 804. The connecting plate 803 is fixedly connected to the connector fixing end 804 on its right side. A clamping ring 602 is tightly fitted to the outside of the connector fixing end 804. The clamping ring 602 is used to position the connector fixing end 804. A support block 601, made of alloy material, is bolted to the bottom of the clamping ring 602. The support block 601 is fixedly connected to the positioning block 6 at its bottom. A connecting strip 701, also made of alloy material, is fixed to the top of the connecting plate 5.The connecting strip 701 is used to position the positioning head 702. The positioning head 702 is fixed to the right end of the connecting strip 701. The positioning head 702 is used to position the moving rod 7. The positioning head 702 is hinged to the moving rod 7 inside it. The right end of the moving rod 7 is fixed to a moving head 704. The moving head 704 is made of alloy material. The moving head 704 moves on the track of the moving plate 703, so that when the connector moving end 805 rotates to the right, the moving rod 7 does not move, thus ensuring the stability of the entire device. The moving head 704 is slidably connected to the slide groove on the moving plate 703. The positioning plate 701... Two movable blocks 809, made of alloy material, are fixed at the bottom of the 8th component. These blocks are used to position the positioning plate 808. Each movable block 809 has a sliding rail 501 at its bottom for positioning. Each rail 501 is fixedly connected to the connecting plate 5 at its bottom. A clamping plate 810, made of rubber material, is fixed to the inner side of each clamping rod 807. The clamping plate 810 is used to clamp the movable end 805 of the connector, and each clamping plate 810 is in close contact with the movable end 805 of the connector inside it.

[0028] When using this device, the operator fixes the connector fixed end 804 using the clamping ring 602. Further, the clamping plate 810 can be moved by extending several clamping rods 807, thereby positioning the connector moving end 805. The operator then secures the connecting plate 5 to the high-pressure chamber 103 using bolts. The operator then closes the chamber door 104 to ensure the high-pressure chamber 103 is airtight. At this time, the controller 101 controls the moving rods 7 and the torsion testing machine 8 to work together, causing the connector fixed end 804 to rotate and the connector moving end 805 to move. The controller 101 can then communicate via the camera 10. 7. Monitor the movement of the connector fixed end 804 and the connector moving end 805. If the camera 107 detects that the connector fixed end 804 and the connector moving end 805 are moving normally, the operator connects the pipe at the left end of the water inlet valve 301 to an external water source. The controller 101 then controls the water pump 3 and the water inlet valve 301 to work together to inject water into the high-pressure chamber 103. At this time, the pressure sensor 106 can monitor the internal pressure of the high-pressure chamber 103. The controller 101 then controls the air pump 401 and the air valve 402 to work together to deliver the gas inside the air tank 4 to the high-pressure chamber 103, thereby changing the high pressure. When the pressure sensor 106 detects that the internal pressure of the high-pressure chamber 103 is the required simulated pressure, the controller 101 controls the liquid nitrogen pipe 201 and the liquid nitrogen pump 202 to operate, thereby transporting liquid nitrogen from the liquid nitrogen tank 2 to the liquid nitrogen pipe 201, and then returning it to the liquid nitrogen tank 2 through the liquid nitrogen outlet valve 204, thereby cooling the high-pressure chamber 103. When the temperature sensor 105 detects that the internal temperature of the high-pressure chamber 103 has reached the required simulated temperature, the controller 101 controls the moving rod 7 to extend, thereby moving the positioning plate 808 to the right, thereby moving the connector moving end 805 to the right, thus simulating the connector... During the insertion and removal test of the fixed end 804 and the connector moving end 805, the controller 101 can monitor the deformation of the connector moving end 805 and the connector fixed end 804 through the camera 107, thereby ensuring the accuracy of the test. Furthermore, the controller 101 controls the torsion testing machine 8 to work, thereby driving the connecting plate 803 to rotate, thereby driving the connector fixed end 804 to rotate, thereby testing the screwing in and screwing out of the connector moving end 805. When the connector moving end 805 moves to the right, the moving plate 703 and the moving head 704 ensure that the moving rod 7 does not extend or retract while the positioning plate 808 can move, thereby ensuring the stability of the test.

[0029] The working process of this utility model is as follows: When using this device, the operator fixes the connector fixed end 804 using the clamping ring 602. Further, by extending several clamping rods 807, the clamping plate 810 can be moved, thereby positioning the connector moving end 805. The operator then uses bolts to secure the connecting plate 5 to the high-pressure chamber 103. The operator then closes the chamber door 104 to ensure the airtightness of the high-pressure chamber 103. At this time, the controller 101 controls the moving rods 7 and the torsion testing machine 8 to work together, causing the connector fixed end 804 to rotate and simultaneously moving the connector moving end 805. The controller 101 can then... The camera 107 monitors the movement of the connector fixed end 804 and the connector moving end 805. If the camera 107 detects that the movement of the connector fixed end 804 and the connector moving end 805 is normal, the operator connects the pipe at the left end of the water inlet valve 301 to an external water source. The controller 101 then controls the water pump 3 and the water inlet valve 301 to work together, thereby injecting water into the high-pressure chamber 103. At this time, the pressure sensor 106 monitors the internal pressure of the high-pressure chamber 103. The controller 101 then controls the air pump 401 and the air valve 402 to work together, thereby transporting the gas inside the air tank 4 into the high-pressure chamber 103. The internal pressure of the high-pressure chamber 103 is changed. When the pressure sensor 106 detects that the internal pressure of the high-pressure chamber 103 is at the required simulated pressure, the controller 101 controls the liquid nitrogen pipe 201 and the liquid nitrogen pump 202 to work, thereby transporting liquid nitrogen from the liquid nitrogen tank 2 to the liquid nitrogen pipe 201, and then returning it to the liquid nitrogen tank 2 through the liquid nitrogen outlet valve 204, thereby cooling the high-pressure chamber 103. When the temperature sensor 105 detects that the internal temperature of the high-pressure chamber 103 has reached the required simulated temperature, the controller 101 controls the moving rod 7 to extend, thereby driving the positioning plate 808 to move to the right, thereby driving the connector moving end 805 to move to the right, thus simulating the... During the insertion and removal test of the connector fixed end 804 and the connector moving end 805, the controller 101 can monitor the deformation of the connector moving end 805 and the connector fixed end 804 through the camera 107, thereby ensuring the accuracy of the test. Furthermore, the controller 101 controls the torsion testing machine 8 to work, thereby driving the connecting plate 803 to rotate, thereby driving the connector fixed end 804 to rotate, thereby testing the screwing in and screwing out of the connector moving end 805. When the connector moving end 805 moves to the right, the moving plate 703 and the moving head 704 ensure that the moving rod 7 does not extend or retract while the positioning plate 808 can move, thereby ensuring the stability of the test.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-channel hydraulic connector underwater insertion / removal testing device, characterized in that: The system includes a support plate (1), a high-pressure chamber (103) fixed on the top of the support plate (1), a liquid nitrogen tank (2) at the left end of the high-pressure chamber (103), a liquid nitrogen pipe (201) fixed on the outside of the high-pressure chamber (103), a gas tank (4) at the right end of the high-pressure chamber (103), a door (104) fastened to the top of the high-pressure chamber (103) by bolts, a water pump (3) fixed on the left end of the high-pressure chamber (103), a connecting plate (5) inside the high-pressure chamber (103), a positioning block (6) fixed on the top of the connecting plate (5), and a connector fixing end (804) on the top of the positioning block (6). The connector fixed end (804) is fastened to the right end of the connector moving end (805). The left end of the connector fixed end (804) is provided with a torque rod blind plate (802). The left end of the torque rod blind plate (802) is rotatably connected to a torsion testing machine (8). The connector moving end (805) is provided with an adapter ring (806). Several clamping rods (807) are fixed on the adapter ring (806). A positioning plate (808) is fixed at the bottom of the adapter ring (806). A moving plate (703) is fixed at the left end of the positioning plate (808). A moving rod (7) is slidably connected inside the moving plate (703).

2. The underwater insertion and removal testing device for multi-channel hydraulic connectors according to claim 1, characterized in that: A controller (101) is fixed to the top of the support plate (1), and a power supply (102) is fixed to the rear end of the controller (101). A temperature sensor (105) is fixed to the left end of the high-pressure chamber (103), and a pressure sensor (106) is fixed to the top of the temperature sensor (105). A water inlet valve (301) is fixed to the left end of the water pump (3), and an air pump (401) is fixed to the left end of the air tank (4). An air valve (402) is fixed to the left end of the air pump (401), and the air valve (402) is fixed to the high-pressure chamber (103) through a pipe.

3. The underwater insertion and removal testing device for multi-channel hydraulic connectors according to claim 2, characterized in that: A liquid nitrogen pump (202) is fixed to the top of the left end of the support plate (1), and a liquid nitrogen inlet valve (203) is fixed to the right end of the liquid nitrogen pump (202). The liquid nitrogen inlet valve (203) is fixedly connected to the head end of the liquid nitrogen pipe (201), and a liquid nitrogen outlet valve (204) is fixed to the end of the liquid nitrogen pipe (201). The left end of the liquid nitrogen outlet valve (204) is fixedly connected to the liquid nitrogen tank (2) through a pipe.

4. The underwater insertion and removal testing device for multi-channel hydraulic connectors according to claim 2, characterized in that: The high-pressure chamber (103) is fastened to the connecting plate (5) inside it by bolts. A positioning strip (502) is fixed on the top of the connecting plate (5). A positioning disc (801) is fastened to the inside of the positioning strip (502). The positioning disc (801) is fixedly connected to the torsion testing machine (8) inside it. A connecting disc (803) is fastened to the right end of the torque rod blind plate (802). The connecting disc (803) is fixedly connected to the connector fixing end (804) on its right end. A clamping ring (602) is tightly fitted to the outside of the connector fixing end (804). A support block (601) is fastened to the bottom of the clamping ring (602) by bolts. The support block (601) is fixedly connected to the positioning block (6) at its bottom.

5. The underwater insertion and removal testing device for multi-channel hydraulic connectors according to claim 4, characterized in that: The top of the connecting plate (5) is also fixed with a connecting strip (701), and the right end of the connecting strip (701) is fixed with a positioning head (702). The positioning head (702) is hinged to the moving rod (7) inside it. The right end of the moving rod (7) is fixed with a moving head (704). The moving head (704) is slidably connected to the groove on the moving plate (703). The bottom of the positioning plate (808) is fixed with two moving blocks (809). The bottom of each moving block (809) is slidably connected with a moving rail (501). Each moving rail (501) is fixedly connected to the connecting plate (5) at its bottom. The inside of each clamping rod (807) is fixed with a clamping plate (810). Each clamping plate (810) is tightly attached to the moving end (805) of the connector inside it.

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