Device with high-temperature and high-pressure continuous gradient chemical reaction process protection function

Abstract

The utility model relates to a pressure protection technology, in particular to a device with a high-temperature and high-pressure continuous gradient chemical reaction process protection function. The device at least comprises a rectangular shell 1, a longitudinal air channel, a horizontal air channel, a lever 15 and a linkage mechanism, the longitudinal air channel and the horizontal air channel interlock a three-way valve 28 through the lever 15 and the linkage mechanism, and pressure closing protection is achieved. The device has continuous gradient protection and an accurate response mechanism, and ensures that an experiment is carried out safely. Meanwhile, the device is reasonable in design and simple to operate, can stably work in a high-temperature and high-pressure severe environment, and provides important safety guarantee for chemical experiments.

Description

Technical Field

[0001] The utility model relates to a pressure protection technology, in particular to a device with high-temperature and high-pressure continuous gradient chemical reaction process protection. Background Art

[0002] In high-temperature and high-pressure continuous gradient chemical reactions, the design and use of protective devices are crucial. Their main function is to ensure the safe progress of the reaction process, prevent possible accidents, and protect reaction equipment and operators.

[0003] The following protective devices are usually used:

[0004] 1) Pressure sensor and pressure control system: The pressure sensor monitors the pressure changes in the reactor in real time. Once the pressure exceeds the preset safety threshold, the pressure control system will automatically start to stabilize the pressure by releasing the pressure or adjusting the reaction conditions to prevent explosion or leakage caused by excessive pressure.

[0005] 2) Temperature monitoring and control system: A temperature sensor monitors the reaction temperature in real time and compares it with a preset temperature range. If the temperature exceeds the safe range, the control system adjusts the heating or cooling device to ensure the reaction proceeds at the appropriate temperature. This helps prevent runaway reactions or equipment damage caused by excessive temperatures.

[0006] 3) Safety valves and relief devices. These are crucial for preventing overpressure. When pressure inside the reactor reaches a dangerous level, the safety valve automatically opens, releasing some gas or liquid to reduce the pressure. The relief device is used to quickly release pressure in an emergency, ensuring the reactor does not rupture due to excessive pressure.

[0007] 4) Explosion-proof membranes and walls: These membranes are used to prevent the explosion from spreading further in extreme situations. If an explosion occurs, the membranes rupture, releasing some of the energy and mitigating damage to equipment and personnel. Explosion-proof walls block the debris and shockwaves generated by the explosion, protecting surrounding equipment and personnel.

[0008] 5) Emergency shut-off system: In an emergency, the emergency shut-off system can quickly cut off the power supply, heat source, or raw material supply to the reactor, stopping the reaction from proceeding further. This helps prevent the reaction from getting out of control or expanding the impact of the accident.

[0009] Existing explosion-proof membrane protection devices are all disposable and cannot be used in high-temperature, high-pressure, continuous gradient chemical reactions that require repeated repetitions. Summary of the Invention

[0010] The purpose of the utility model is to provide a device with high temperature and high pressure continuous gradient chemical reaction process protection which can realize recycling and protection under high temperature and high pressure conditions and different temperature gradients and pressure gradients.

[0011] The purpose of the present utility model is achieved in this way. A device for protecting a high-temperature and high-pressure continuous gradient chemical reaction process is characterized in that it comprises at least the following steps: at least comprising: a rectangular shell 1, a longitudinal airway, a horizontal airway, a lever 15 and a linkage mechanism, the longitudinal airway and the horizontal airway being connected on the left side of the rectangular shell 1 by a three-way valve 28 to form a T-shaped structure.

[0012] The front ends of the longitudinal airway and the horizontal airway are respectively conical cavities 27, and the rear ends are cylindrical cavities. The lower end of the conical cavity 27 of the longitudinal airway is connected to the upper conical cavity 4 of the detection airway 3, and the upper end of the conical cavity 27 of the longitudinal airway is connected to the longitudinal lower end of the three-way valve 28; the conical end of the horizontal airway in the horizontal direction is connected to the horizontal end cavity of the three-way valve 28.

[0013] The longitudinal air channel includes: a conical cavity 27, a longitudinal sliding rod 5, a longitudinal piston 6, a sealing flat gasket 7, a special-shaped top screw 8, and a ball head 9 on the top of the longitudinal sliding rod; the conical cavity 27 and the longitudinal sliding rod 5 are connected by an interlocking three-way valve 28, which is a straight-through channel of the interlocking three-way valve 28. The lower end of the conical cavity 27 enters the detection air channel 3. The detection air channel 3 adopts an external hexagonal nut, and there is an explosion-proof membrane 2 inside the external hexagonal nut. The explosion-proof membrane 2 is placed and fixed in the middle of the external hexagonal nut, and the detection gas enters from the lower end of the external hexagonal nut.

[0014] The upper part of the longitudinal sliding rod 5 is connected to the longitudinal piston 6, and the upper end of the longitudinal piston 6 is connected to the special-shaped top screw 8. The end of the special-shaped top screw 8 is the top ball head 9 of the longitudinal sliding rod. The longitudinal piston 6 and the special-shaped top screw 8 are sealed by a sealing flat gasket 7.

[0015] The ball head 9 at the top of the longitudinal sliding rod is located in the semicircular concave cavity at the front lower end of the short arm of the lever 15; the lever 15 is a duck-shaped structure, and the fulcrum of the lever 15 is connected to the axis of the rectangular shell 1 by the hinge screw 14 on the duck head. The short arm of the lever 15 is the duckbill, and the long arm of the lever 15 is the duck body; the upper part of the duckbill is axial with the ball head 9 at the top of the sliding rod; the upper part of the duckbill is connected to the linkage mechanism for closing the longitudinal air path.

[0016] The linkage mechanism of the longitudinal air path includes at least: a compression spring 12, a bowl-shaped spring seat 11, a fine-tuning handle nut 13 and a housing of the linkage mechanism of the longitudinal air path; the compression spring 12 is in the bowl-shaped spring seat 11, and the bowl-shaped spring seat 11 is positioned on the bowl-shaped spring seat positioning cavity 32 at the lower end; the upper end of the bowl-shaped spring seat 11 is fixed by the fine-tuning handle nut 13 to the compression spring 12 in the bowl-shaped spring seat 11; the whole is fixed in the housing of the linkage mechanism of the longitudinal air path.

[0017] The lever 15 is connected to one end of a hook 18 through a hook hook shaft 17 in the middle of the horizontal long arm, and the other end of the hook 18 is hung with a hook hanging shaft 22 on the horizontal airway.

[0018] The horizontal airway and the longitudinal airway have similar structures. The horizontal airway includes: a horizontal conical cavity 29, a horizontal sliding rod 26, a horizontal cylinder 30, a horizontal cylinder output shaft 31 and a fine-tuning nut 20; the left end of the horizontal conical cavity 29 forms a T-structure connection with the three-way valve 28, and the right end of the horizontal conical cavity 29 is connected to the horizontal sliding rod 26, and the horizontal sliding rod 26 is connected to the horizontal cylinder 30, the horizontal cylinder output shaft 31 and the fine-tuning nut 20 in sequence. The horizontal conical cavity 29, the horizontal sliding rod 26, the horizontal piston 30, and the horizontal cylinder output shaft 31 are concentric bodies, and the horizontal cylinder output shaft 31 is connected to the fine-tuning spring 21 in the fine-tuning nut 20; the fine-tuning nut 20 is fixed to the rectangular shell 1 by an external thread.

[0019] The right end of the fulcrum of the lever 15 is connected with a reset handle 19, and the reset handle 19 and the lever protrusion 10 form a rod body.

[0020] The reset handle 19 is on the long arm of the lever 15, and the short arm of the lever has a lever boss 10. The upper end of the lever boss 10 has a bowl-shaped spring seat 11, and the bowl-shaped spring seat 11 has a compression spring 12. The compression spring 12 is fixed by the upper end of the fine-tuning handle nut 13. A sliding vertical slot 16 is opened in the upper right corner of the rectangular housing 1, and the hook 18 is restricted in the sliding vertical slot 16 to the left and right positions so that the hook 18 cannot move left and right.

[0021] The operating principles and advantages of this utility model are as follows: it comprises a rectangular housing 1, a longitudinal airway, a horizontal airway, a lever 15, and a linkage mechanism. The longitudinal and horizontal airways are connected on the left side of the rectangular housing 1 by a three-way valve 28 in a T-shaped configuration. The utility model interlocks the three-way valve 28 with the longitudinal and horizontal airways via the lever 15 and linkage mechanism, achieving pressure shutoff protection. This utility model provides continuous gradient protection and a precise response mechanism, ensuring safe experimental conduct. Furthermore, its rational design and simple operation enable stable operation in harsh environments of high temperature and high pressure, providing important safety assurance for chemical experiments.

[0022] The present invention will be further described below with reference to the embodiments and accompanying drawings: BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 Stereoscopic image.

[0025] In the figure, 1. rectangular shell; 2. explosion-proof membrane; 3. detection airway (hexagonal nut); 4. conical cavity; 5. longitudinal sliding rod; 6. longitudinal piston; 7. sealing flat gasket; 8. special-shaped top screw; 9. ball head at the top of the longitudinal sliding rod; 10. lever protrusion; 12. compression spring; 11. bowl-shaped spring seat; 13. fine-tuning handle nut; 14. hinge screw; 15. lever; 16. sliding vertical slot; 17. hook shaft; 18. hook; 19. reset handle; 20. fine-tuning nut; 21. fine-tuning spring; 22. hook hanging shaft; 23. hook slot; 24. hook inclined surface; 25. hook inner slot; 26. horizontal sliding rod; 27. conical cavity (conical head); 28. three-way valve; 29. ​​horizontal conical cavity; 30. horizontal cylinder; 31. horizontal cylinder output shaft; 32. bowl-shaped spring seat positioning cavity.

[0026] See also Figure 1 and Figure 2 , a device with high-temperature and high-pressure continuous gradient chemical reaction process protection, characterized in that it includes at least: a rectangular shell 1, a longitudinal airway, a horizontal airway, a lever 15 and a linkage mechanism. The longitudinal airway and the horizontal airway interlock the three-way valve 28 through the lever 15 and the linkage mechanism to achieve pressure shutdown protection.

[0027] like Figure 1 As shown, the longitudinal airway is Figure 1 In the longitudinal direction, the horizontal airway is Figure 1 longitudinal airway and the horizontal airway on the left side of the rectangular housing 1 is connected by a three-way valve 28 to form a T-shaped structure.

[0028] The front ends of the longitudinal airway and the horizontal airway are respectively conical cavities 27, and the rear ends are cylindrical cavities. The lower end of the conical cavity 27 of the longitudinal airway is connected to the upper conical cavity 4 of the detection airway 3, and the upper end of the conical cavity 27 of the longitudinal airway is connected to the longitudinal lower end of the three-way valve 28; the conical end of the horizontal airway in the horizontal direction is connected to the horizontal end cavity of the three-way valve 28.

[0029] See also Figure 1 In part A, the longitudinal air duct is in the longitudinal direction of the rectangular shell 1. The longitudinal air duct includes: a conical cavity 27, a longitudinal sliding rod 5, a longitudinal piston 6, a sealing flat gasket 7, a special-shaped top screw 8, and a ball head 9 on the top of the longitudinal sliding rod; the conical cavity 27 and the longitudinal sliding rod 5 are connected by an interlocking three-way valve 28, which is a straight-through channel of the interlocking three-way valve 28. The lower end of the conical cavity 27 enters the detection air duct 3. The detection air duct 3 adopts an outer hexagonal nut, and there is an explosion-proof membrane 2 inside the outer hexagonal nut. The explosion-proof membrane 2 is placed and fixed in the middle of the outer hexagonal nut, and the detection gas enters from the lower end of the outer hexagonal nut.

[0030] The upper part of the longitudinal sliding rod 5 is connected to the longitudinal piston 6, and the upper end of the longitudinal piston 6 is connected to the special-shaped top screw 8. The end of the special-shaped top screw 8 is the top ball head 9 of the longitudinal sliding rod. The longitudinal piston 6 and the special-shaped top screw 8 are sealed by a sealing flat gasket 7.

[0031] The ball head 9 at the top of the longitudinal sliding rod sits within a semicircular cavity at the front lower end of the short arm of lever 15. Lever 15 is a duck-shaped structure, with its fulcrum at the duck head axially connected to the rectangular housing 1 by a hinge screw 14. The short arm of lever 15 forms the duckbill (lever protrusion 10), while the long arm forms the duck body. The upper portion of the duckbill is axially aligned with the ball head 9 at the top of the sliding rod. The upper portion of the duckbill is connected to the linkage mechanism that closes the longitudinal air path.

[0032] The longitudinal air path linkage mechanism comprises at least a compression spring 12, a bowl-shaped spring seat 11, a fine-tuning handle nut 13, and a longitudinal air path linkage mechanism housing. The compression spring 12 is located within the bowl-shaped spring seat 11, which is positioned within the bowl-shaped spring seat positioning cavity 32 at its lower end. The upper end of the bowl-shaped spring seat 11 is secured within the bowl-shaped spring seat 11 by the fine-tuning handle nut 13. The entire mechanism is secured within the longitudinal air path linkage mechanism housing. The compression spring 12's retractable force is limited by the lever protrusion 10. When the lever protrusion 10 moves downward, the compression spring 12 releases pressure. The degree of pressure release from the compression spring 12 is controlled by the fine-tuning handle nut 13. When the fine-tuning handle nut 13 is turned upward, the pressure released by the compression spring 12 is reduced; when the fine-tuning handle nut 13 is turned downward, the pressure released by the compression spring 12 is increased.

[0033] The lever 15 of the duck-shaped structure is connected to one end of a hook 18 through a hook shaft 17 in the middle of the horizontal long arm, and the other end of the hook 18 is hung with a hook shaft 22 on the horizontal airway.

[0034] The horizontal airway and the longitudinal airway have similar structures. The horizontal airway includes: a horizontal conical cavity 29, a horizontal sliding rod 26, a horizontal cylinder 30, a horizontal cylinder output shaft 31 and a fine-tuning nut 20; the left end of the horizontal conical cavity 29 (see Figure 1 ) forms a T-shaped structure connection with the three-way valve 28, the right end of the horizontal conical cavity 29 is connected to the horizontal sliding rod 26, and the horizontal sliding rod 26 is sequentially connected to the horizontal cylinder 30, the horizontal cylinder output shaft 31 and the fine-tuning nut 20. The horizontal conical cavity 29, the horizontal sliding rod 26, the horizontal piston 30, and the horizontal cylinder output shaft 31 are concentric bodies, and the horizontal cylinder output shaft 31 is connected to the fine-tuning spring 21 in the fine-tuning nut 20; the fine-tuning nut 20 is fixed to the rectangular shell 1 by an external thread.

[0035] After the external detection gas connected by the three-way valve 28 enters the horizontal conical cavity 29, strong gas enters the conical end of the horizontal conical cavity 29, which will push the horizontal sliding rod 26 in the cavity to move. The horizontal sliding rod 26 drives the horizontal piston 30 to move, thereby driving the horizontal cylinder output shaft 31 to move to the right. On the one hand, its output force drives the hook hanging shaft 22 on the horizontal cylinder output shaft 31 to unhook from the hook groove 23 of the hook 18, releasing the linkage mechanism of the longitudinal air path, and the compression spring 12 of the longitudinal air path releases the pressure, so that the conical cavity 27 enters the conical cavity 4 downward, blocking the external gas and realizing pressure closing protection.

[0036] The right end of the fulcrum of the lever 15 is connected to a reset handle 19. The reset handle 19 and the lever boss 10 are a rod body. The reset handle 19 is designed for repeated use. When the experiment is repeated, the explosion-proof membrane 2 in the hexagonal nut 3 is reinstalled, and the reset handle 19 is pressed down to conduct a new test.

[0037] The principle is that the reset handle 19 is on the long arm of the lever 15, and there is a lever boss 10 on the short arm (duckbill) of the lever. There is a bowl-shaped spring seat 11 on the upper end of the lever boss 10, and a compression spring 12 in the bowl-shaped spring seat 11. The compression spring 12 is fixed by the fine-tuning handle nut 13 at the upper end. When the reset handle 19 is downward, the first interlock will be caused: the lever boss 10 is upward, the compression spring 12 is re-compressed to form new potential energy, and the hook hanging shaft 22 is lifted out along the hook inclined surface 24 and re-enters the hook groove 23, closing the linkage mechanism of the longitudinal air path.

[0038] A sliding vertical slot 16 is provided in the upper right corner of the rectangular housing 1, and the hook 18 is restricted in the left and right positions in the sliding vertical slot 16 so that the hook 18 cannot move left and right; the sliding vertical slot 16 is actually called a sliding limit slot, which is a limit slot.

[0039] The working process of the utility model is as follows: firstly, the explosion-proof membrane 2 is placed in the hexagonal nut 3 of the detection airway, and then connected to the high-pressure reactor, and the reset handle 19 is pressed down; the utility model enters the working state.

[0040] When the working pressure of the protection device exceeds the working pressure of the explosion-proof membrane, the explosion-proof membrane bursts, and the high-pressure gas quickly passes through the hexagonal nut 3 of the detection airway, and then passes through the conical cavity 4 and the horizontal cavity, pushing the horizontal sliding rod 26 to move to the right. The hook 18 of the interlocking mechanism is disengaged from the hook hanging shaft 22. Under the action of the compression spring 12, the lever 15 rotates along the hinge screw 14. At this time, the arc surface of the head of the lever 15 is in close contact with the sliding surface of the longitudinal sliding rod 5. Under the pressure of the compression spring 12, the conical cavity 27 moves downward rapidly and is inserted into the conical hole of the conical cavity 4. The utility model completes the safety protection of the first gradient experiment.

[0041] As the chemical reaction proceeds, the continuous gradient experiment under high temperature and high pressure conditions continues. At this point, the protective device's first gradient experiment safety protection has been activated, effectively isolating the potential source of danger. However, the experiment is still ongoing, and to ensure the safety of subsequent experiments, the utility model needs to perform further protective actions.

[0042] When the experiment enters the next gradient and the temperature and pressure change again, exceeding the set safety range, the utility model will be activated again. At this time, the longitudinal sliding rod 5 is pushed upward by the high-pressure gas. This action opens the connection between the conical cavity and the cylindrical cavity, which was originally in a sealed state, and allows the high-pressure gas to pass through quickly.

[0043] Simultaneously, the movement of longitudinal sliding rod 5 causes a corresponding change in the structure of the longitudinal cavity with which it forms a sliding engagement. This change further compresses compression spring 12, thereby increasing its force on lever 15. Under the strong force of compression spring 12, lever 15 again rotates along hinge screw 14, causing the arc surface of its head to tightly fit the sliding rod on the other side (not shown).

[0044] As lever 15 rotates, the connected sliding rod also rapidly moves downward, inserting into the corresponding tapered hole. This protector thus completes the safety protection for the second gradient experiment. At this point, the high-pressure gas is effectively isolated both horizontally and vertically, ensuring the safety of the experimental equipment and personnel.

Claims

1. A device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process, characterized by: The method comprises at least the following steps: a rectangular shell (1), a longitudinal airway, a horizontal airway, a lever (15) and a linkage mechanism, wherein the longitudinal airway and the horizontal airway are connected to form a T-shaped structure on the left side of the rectangular shell (1) by a three-way valve (28).

2. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 1 is characterized in that: The front ends of the longitudinal airway and the horizontal airway are respectively formed into a cone-shaped cavity (27), and the rear ends are formed into a cylindrical cavity. The lower end of the cone-shaped cavity (27) of the longitudinal airway is communicated with the upper cone-shaped cavity (4) of the detection airway (3), and the upper end of the cone-shaped cavity (27) of the longitudinal airway is communicated with the longitudinal lower end of the three-way valve (28); the cone end of the horizontal airway in the horizontal direction is connected to the horizontal end cavity of the three-way valve (28).

3. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 1 is characterized in that: The longitudinal air passage comprises: a conical cavity (27), a longitudinal sliding rod (5), a longitudinal piston (6), a sealing flat washer (7), a special-shaped top screw (8), and a ball head (9) at the top of the longitudinal sliding rod; the conical cavity (27) and the longitudinal sliding rod (5) are connected by an interlocking three-way valve (28), which is a straight-through passage of the interlocking three-way valve (28); the lower end of the conical cavity (27) enters the detection air passage (3), and the detection air passage (3) adopts an outer hexagonal nut, and an explosion-proof membrane (2) is arranged inside the outer hexagonal nut. The explosion-proof membrane (2) is placed and fixed in the middle of the outer hexagonal nut, and the detection gas enters from the lower end of the outer hexagonal nut.

4. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 3 is characterized by: The upper part of the longitudinal sliding rod (5) is connected to the longitudinal piston (6), and the upper end of the longitudinal piston (6) is connected to the special-shaped top screw (8). The end of the special-shaped top screw (8) is the top ball head (9) of the longitudinal sliding rod. The longitudinal piston (6) and the special-shaped top screw (8) are sealed by a sealing flat gasket (7).

5. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 3 is characterized by: The ball head (9) at the top of the longitudinal sliding rod is located in a semicircular concave cavity at the front lower end of the short arm of the lever (15); the lever (15) is a duck-shaped structure, the fulcrum of the lever (15) is connected to the axis of the rectangular shell (1) on the duck head by a hinge screw (14), the short arm of the lever (15) is the duck bill, and the long arm of the lever (15) is the duck body; the upper part of the duck bill is axial with the ball head (9) at the top of the sliding rod; the upper part of the duck bill is connected to the linkage mechanism for closing the longitudinal air path.

6. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 5 is characterized by: The longitudinal air path linkage mechanism comprises at least: a compression spring (12), a bowl-shaped spring seat (11), a fine-tuning handle nut (13) and a longitudinal air path linkage mechanism housing; the compression spring (12) is in the bowl-shaped spring seat (11), and the bowl-shaped spring seat (11) is positioned on the bowl-shaped spring seat positioning cavity (32) at the lower end; the upper end of the bowl-shaped spring seat (11) is fixed by the fine-tuning handle nut (13) to fix the compression spring (12) in the bowl-shaped spring seat (11); and the whole is fixed in the longitudinal air path linkage mechanism housing.

7. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 1 is characterized by: The lever (15) is connected to one end of the hook (18) through the hook hook shaft (17) in the middle of the horizontal long arm, and the other end of the hook (18) is connected to the hook hanging shaft (22) on the horizontal airway.

8. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 1 is characterized by: The horizontal airway and the longitudinal airway have similar structures. The horizontal airway includes: a horizontal conical cavity (29), a horizontal sliding rod (26), a horizontal cylinder (30), a horizontal cylinder output shaft (31) and a fine-tuning nut (20); the left end of the horizontal conical cavity (29) is connected to the three-way valve (28) to form a T-shaped structure, and the right end of the horizontal conical cavity (29) is connected to the horizontal sliding rod (26), and the horizontal cylinder (30), the horizontal cylinder output shaft (31) and the fine-tuning nut (20) are connected in sequence by the horizontal sliding rod (26). The horizontal conical cavity (29), the horizontal sliding rod (26), the horizontal cylinder (30) and the horizontal cylinder output shaft (31) are concentric bodies, and the horizontal cylinder output shaft (31) is connected to the fine-tuning spring (21) in the fine-tuning nut (20); the fine-tuning nut (20) is fixed to the rectangular shell (1) through an external thread.

9. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 1 is characterized by: The right end of the lever (15) fulcrum is connected with a reset handle (19), and the reset handle (19) and the lever boss (10) are a rod body.

10. The device for protecting a high-temperature, high-pressure, continuous gradient chemical reaction process according to claim 1, wherein: The reset handle (19) is on the long arm of the lever (15), and the short arm of the lever has a lever boss (10), the upper end of the lever boss (10) has a bowl-shaped spring seat (11), and the bowl-shaped spring seat (11) has a compression spring (12), and the compression spring (12) is fixed by the fine-tuning handle nut (13) at the upper end. A sliding vertical slot (16) is opened in the upper right corner of the rectangular housing (1), and the hook (18) is restricted to the left and right positions in the sliding vertical slot (16), so that the hook (18) cannot move left and right.

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