Device for purifying and preparing high-purity oxygen

Abstract

The utility model discloses a device for purifying and preparing high-purity oxygen. The device for purifying and preparing high-purity oxygen comprises a high-purity oxygen preparing mechanism and a pure oxygen safety valve assembly, the high-purity oxygen preparing mechanism comprises an oxygen purifying tank, one end of the oxygen purifying tank is fixedly connected with an air inlet pipe through a bolt, and a valve cover can move up and down; the control speed of outflow, discharge or closing of the high-purity oxygen is increased, when the sensor detects an emergency situation, the switch valve cover can be started by controlling the servo motor, conveying of the high-purity oxygen is rapidly released or closed, it is ensured that the high-purity oxygen discharge working environment is prevented from safety risks, and the safety of the high-purity oxygen discharge working environment is guaranteed. A sensor and a control device are generally used for monitoring and controlling flowing of oxygen, and in the high-purity oxygen conveying process, when high-purity oxygen is conveyed, the flowing speed of the oxygen can be avoided, so that temperature rise and burning explosion are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of devices for purifying and preparing high-purity oxygen, in particular to a device for purifying and preparing high-purity oxygen. Background Art

[0002] The preparation of high-purity oxygen is widely used in the fields of medical treatment, industry and scientific research. In the medical field, high-purity oxygen is used for medical oxygen therapy, gas sterilization, etc. In the industrial field, high-purity oxygen can be used for metal cutting, welding and other processes. In the field of scientific research, high-purity oxygen is used for laboratory experiments and analysis. With the development of science and technology, high-purity oxygen preparation technology is also constantly innovating and improving. For example, the emergence of new adsorption materials and high-efficiency membranes has improved the performance and efficiency of high-purity oxygen preparation technology.

[0003] The prior art discloses a technical solution for a device for purifying and preparing high-purity oxygen. A particulate filter is connected to one end of a primary industrial oxygen pipeline, and the particulate filter filters small particulate impurities. A pipeline on one side of the particulate filter is connected to a dry heat exchange tank, and the dry heat exchange tank absorbs moisture. During the absorption process, condensed water generated in the process of converting oxygen from liquid to gas is prevented from affecting the purity of oxygen. The dry heat exchange tank is subjected to heat exchange treatment to return the oxygen to normal temperature. A small molecule impurity filter is connected to one side of the dry heat exchange tank, and the small molecule impurity filter further filters impurities from the oxygen. A carbon dioxide filter is connected to one side of the small molecule impurity filter, and the carbon dioxide filter filters and absorbs carbon dioxide in the oxygen. A pipeline on one side of the carbon dioxide filter tank is connected to a nitrogen filter tank, which filters and absorbs nitrogen in the oxygen. A pipeline on one side of the nitrogen filter tank is connected to a pressurized storage tank, which pressurizes and stores the purified oxygen, thereby improving the storage capacity of a single pressurized storage tank, thereby improving the continuous purification capacity of the equipment, and at the same time, the purified oxygen can be directly output without the need for pressurized storage again. An isolation cavity is provided in the pressurized storage tank, and the oxygen is sucked into the isolation cavity. A suction pump is provided on the top of the isolation cavity, and the suction pump draws the oxygen into the isolation cavity. A pressure pump is provided at the bottom of the isolation cavity, and the pressure pump pressurizes and stores the oxygen in the isolation cavity to increase the storage capacity. An exhaust port is provided at the bottom of the pressurized storage tank, and the oxygen is discharged from the exhaust port.

[0004] In this solution, since the purified high-purity oxygen is discharged and stored, there may be safety hazards in the discharge of high-purity oxygen. If the discharged high-purity oxygen leaks, the high concentration of oxygen may increase the risk of fire and explosion under certain conditions.

[0005] Therefore, it is necessary to provide a device for purifying and preparing high-purity oxygen to solve the above technical problems. Utility Model Content

[0006] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a device for purifying and preparing high-purity oxygen. When the high-purity oxygen is discharged into a storage tank, the leakage of the high-purity oxygen can be avoided through a protective device, thereby reducing the potential safety hazards of the discharge of high-purity oxygen.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The device for purifying and preparing high-purity oxygen comprises: a high-purity oxygen preparation mechanism and a pure oxygen safety valve assembly, wherein the high-purity oxygen preparation mechanism comprises a purified oxygen tank, one end of the purified oxygen tank is connected and fixed with an air intake pipe by bolts, the air intake pipe is connected to the bottom end of the pure oxygen safety valve assembly by bolts, one end of the pure oxygen safety valve assembly is connected and fixed with an exhaust pipe by bolts, the exhaust pipe is connected to one end of a high-purity oxygen storage tank by bolts, a support column is fixedly installed at the lower end of the pure oxygen safety valve assembly, the pure oxygen safety valve assembly comprises a servo motor, and the servo motor A first valve body is fixedly installed at the lower end, a threaded screw is provided inside the first valve body and is installed on a servo motor, the threaded screw passes through the interior of the movable valve block, a fixed column is installed at the lower end of the movable valve block, a bottom plate is provided at the lower end of the fixed column, a connecting bolt is provided at the lower end of the movable valve block, the connecting bolt is connected to the interior of the limiting column by passing through, a valve cover is provided at the lower end of the connecting bolt, a valve sleeve is provided at the lower end of the valve cover, the valve sleeve is installed at the upper end of the high-purity oxygen steel pipe, a second flange is installed at the lower end of the first valve body, and a sensor is provided on one side of the first valve body.

[0009] Preferably, a leak-proof disk is installed between the first valve body and the servo motor, a first flange is provided at the lower end of the second flange, a first piston ring is provided inside the first flange and connected to the inside of the second flange, and a connecting bolt passes through the inside of the first piston ring.

[0010] Preferably, a second valve body is installed at the lower end of the second flange, fixing bolts are provided on both sides of the second valve body, the fixing bolts are connected to both sides of the valve sleeve, a second piston ring is provided at one end of the valve sleeve and passes through the fixing bolt, and the fixing bolt is connected to the third piston ring through the fixing bolt and connected to both sides of the second valve body.

[0011] Preferably, a second flange and a first flange are provided at the lower end of the second valve body, and the first flange is connected to a high-purity oxygen inlet pipe.

[0012] Preferably, a first manual valve is provided on both sides of the second valve body, the first manual valve is connected with a connecting arc ring through a through hole, one end of the connecting arc ring is connected to the second valve body, one end of the first manual valve is provided with a first fixed disk, the first fixed disk is connected to a second fixed disk, and the second fixed disk is provided with an exhaust pipe.

[0013] Preferably, a blocking ball is provided inside the first manual valve, a through hole is opened inside the blocking ball, a connecting column is installed on the blocking ball, a rotating rod is fixedly installed on the connecting column, the rotating rod and the connecting column pass through the interior of the guide sleeve column, and a rotating handle is provided on the upper end of the rotating rod.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The utility model utilizes a pure oxygen safety valve assembly to effectively drive the threaded screw and the movable valve block through a servo motor, thereby realizing the up and down movement of the valve cover, thereby improving the control speed of the discharge or closure of the high-purity oxygen gas outflow. When the sensor detects an emergency, the servo motor can be controlled to start the switch valve cover to quickly release or close the delivery of high-purity oxygen gas, thereby responding to the emergency in a timely manner, ensuring that the high-purity oxygen gas delivery working environment is protected from safety risks, and reducing the need for manual intervention. Sensors and control devices are usually used to monitor and control the flow of oxygen. During the high-purity oxygen gas delivery process, when delivering high-purity oxygen, the oxygen flow rate can be avoided to prevent temperature increase and combustion.

[0016] (2) The utility model uses a leak-proof disk and a first piston ring to prevent possible leakage during the transportation of high-purity oxygen gas, thereby preventing the high-purity oxygen gas from diffusing into the surrounding environment to cause harm and potential safety risks.

[0017] (3) The utility model uses a fixing bolt to prevent the valve sleeve from loosening or falling off due to the pressure generated when discharging high-purity oxygen gas. The second piston ring and the third piston ring can prevent the high-purity oxygen gas from leaking out from both sides of the valve sleeve and the second valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the device for purifying and preparing high-purity oxygen provided by the utility model;

[0019] Figure 2 100 is a schematic diagram of the structure of a pure oxygen safety valve assembly of a device for purifying and preparing high-purity oxygen provided by the utility model;

[0020] Figure 3 A schematic diagram of the servo motor and valve structure of the device for purifying and preparing high-purity oxygen provided by the utility model;

[0021] Figure 4 A schematic diagram of the threaded screw structure of the device for purifying and preparing high-purity oxygen provided by the utility model;

[0022] Figure 5 A schematic diagram of the valve cover and valve sleeve structure of the device for purifying and preparing high-purity oxygen provided by the utility model;

[0023] Figure 6 A schematic diagram of the structure of a movable valve block of a device for purifying and preparing high-purity oxygen provided by the utility model;

[0024] Figure 7 A schematic diagram of the structure of a rotating handle of the device for purifying and preparing high-purity oxygen provided by the utility model;

[0025] The names corresponding to the reference numerals are: 100, pure oxygen safety valve assembly; 101, sensor; 102, first flange; 103, second flange; 104, first valve body; 105, leakproof disc; 106, servo motor; 107, first manual valve; 109, second valve body; 110, threaded screw; 111, moving valve block; 113, fixed column; 114, bottom plate; 115, first piston ring; 116, connecting arc ring; 117, rotating handle; 118, rotating rod; 119, rotating handle; 200, rotating handle; 210, rotating handle; 211, rotating handle; 212, rotating handle; 213, rotating handle; 214, rotating handle; 215, rotating handle; 216, rotating handle; 217, rotating handle; 218, rotating handle; 219, rotating handle; 220, rotating handle; 221, rotating handle; 222, rotating handle; 223, rotating handle; 224, rotating handle; 225, rotating handle; 226, rotating handle; 227, rotating handle; 228, rotating handle; 229, rotating handle; 230, rotating handle; 231, rotating handle; 232, rotating handle; 233, rotating handle; 234, rotating handle; 235, rotating handle; 236, rotating handle; 237, rotating handle; 238, rotating handle; 239, rotating handle; 240, rotating handle; 241, rotating handle; 242, rotating handle; 243, rotating handle; 244, rotating handle; 245, rotating handle; 246, rotating handle; 247, rotating handle; 248, rotating handle; 249, rotating handle; 250, rotating handle; 251, rotating handle 9. Guide sleeve column; 120. First fixed plate; 121. Second fixed plate; 122. Exhaust pipe; 124. Limit column; 125. Connecting bolt; 126. Valve cover; 127. Valve sleeve; 128. Fixing bolt; 129. Second piston ring; 130. Third piston ring; 131. High-purity oxygen steel pipe; 132. Connecting column; 133. Blocking ball; 134. Through hole; 200. High-purity oxygen preparation mechanism; 201. Oxygen purification tank; 202. High-purity oxygen storage tank; 203. Support column; 204. Inlet pipe. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0027] First embodiment:

[0028] like Figure 1-6As shown, the device for purifying and preparing high-purity oxygen provided by the utility model comprises: a high-purity oxygen preparation mechanism 200 and a pure oxygen safety valve assembly 100, wherein the high-purity oxygen preparation mechanism 200 comprises a purified oxygen tank 201, wherein the purified oxygen tank 201 separates pure oxygen from the air by physical or chemical methods, wherein one end of the purified oxygen tank 201 is connected and fixed with an air inlet pipe 204 by bolts, wherein the air inlet pipe 204 is connected and fixed with the bottom end of the pure oxygen safety valve assembly 100 by bolts, wherein one end of the pure oxygen safety valve assembly 100 is connected and fixed with an exhaust pipe 122 by bolts, wherein the exhaust pipe 122 is connected and fixed with one end of a high-purity oxygen storage tank 202 by bolts, wherein the high-purity oxygen storage tank 202 is used to store the purified high-purity oxygen. , by opening the pure oxygen safety valve assembly 100, and inputting the high-purity oxygen gas in the purified oxygen tank 201 into the interior of the intake pipe 204, and further transporting it from the exhaust pipe 122 to the interior of the high-purity oxygen storage tank 202, the lower end of the pure oxygen safety valve assembly 100 is fixedly installed with a support column 203, the pure oxygen safety valve assembly 100 includes a servo motor 106, the lower end of the servo motor 106 is fixedly installed with a first valve body 104, the interior of the first valve body 104 is provided with a threaded screw 110 and is installed on the servo motor 106, the threaded screw 110 passes through the interior of the movable valve block 111, the lower end of the movable valve block 111 is installed with a fixed column 113, and the lower end of the fixed column 113 is provided with a bottom plate 114 , a connecting bolt 125 is provided at the lower end of the movable valve block 111, and the connecting bolt 125 is connected to the inside of the limiting column 124 by penetrating, and a valve cover 126 is provided at the lower end of the connecting bolt 125, and a valve sleeve 127 is provided at the lower end of the valve cover 126, and the valve sleeve 127 is installed at the upper end of the high-purity oxygen steel pipe 131. A second flange 103 is installed at the lower end of the first valve body 104, and a sensor 101 is provided on one side of the first valve body 104. In actual use, by opening the pure oxygen safety valve assembly 100, and inputting the high-purity oxygen gas inside the purified oxygen tank 201 into the inside of the intake pipe 204, and further transporting it from the exhaust pipe 122 to the inside of the high-purity oxygen storage tank 202, the servo motor 106 is started to drive the screw The screw rod 110 rotates and drives the movable valve block 111 to move up and down, and then the connecting bolt 125 and the valve cover 126 move up and down, and the limit column 124 can block the moving spacing range of the valve cover 126. The lower end of the valve cover 126 is inserted on the valve sleeve 127. The through hole 134 is provided inside the valve cover 126. The movement can release or close the high-purity oxygen gas flowing out of the valve sleeve 127. The high-purity oxygen gas flows to the inside of the high-purity oxygen steel pipe 131 through the gas delivery pipeline, and then flows out of the valve sleeve 127 from the inside of the high-purity oxygen steel pipe 131. The high-purity oxygen is then transported from the exhaust pipe 122 to the inside of the high-purity oxygen storage tank 202. The sensor 101 can be configured to detect emergency situations such as leakage in the high-purity oxygen gas delivery.The servo motor 106 can be controlled to start the switch valve cover 126 to release high-purity oxygen and close the high-purity oxygen gas delivery.

[0029] In this embodiment, by utilizing the pure oxygen safety valve assembly 100, the servo motor 106 is effectively used to drive the threaded screw 110 and the movable valve block 111, so that the valve cover 126 can be moved up and down, thereby improving the control speed of the outflow discharge or closing of the high-purity oxygen gas. When the sensor 101 detects an emergency, the servo motor 106 can be controlled to start the switch valve cover 126 to quickly release or close the delivery of the high-purity oxygen gas, thereby responding to the emergency in time, ensuring that the high-purity oxygen gas delivery working environment prevents safety risks, and reducing the need for manual intervention. Sensors 101 and control devices are usually used to monitor and control the flow of oxygen. During the high-purity oxygen gas delivery process, when delivering high-purity oxygen, the oxygen flow rate can be avoided to prevent temperature increase and combustion.

[0030] Second embodiment:

[0031] like Figure 3 As shown, a leak-proof disk 105 is installed between the first valve body 104 and the servo motor 106. The leak-proof disk 105 and the first piston ring 115 are usually made of corrosion-resistant and wear-resistant materials such as PP (polypropylene) or HDPE (high-density polyethylene), which can prevent the high-purity oxygen gas from leaking out. A first flange 102 is provided at the lower end of the second flange 103. A first piston ring 115 is provided inside the first flange 102 and is connected to the inside of the second flange 103. A connecting bolt 125 runs through the inside of the first piston ring 115.

[0032] In this embodiment, the leak-proof disk 105 and the first piston ring 115 are used to prevent possible leakage of high-purity oxygen gas during the transportation process, and to prevent the high-purity oxygen gas from diffusing into the surrounding environment to cause harm and potential safety risks.

[0033] Third embodiment:

[0034] like Figure 3 , Figure 5As shown, the lower end of the second flange 103 is connected and fixed to the second valve body 109 by welding, and the two sides of the second valve body 109 are connected by penetrating fixing bolts 128, and the fixing bolts 128 are connected to the two sides of the valve sleeve 127. The fixing bolts 128 can fix the valve sleeve 127 to prevent the valve sleeve 127 from loosening or falling off due to the pressure generated when discharging high-purity oxygen gas. One end of the valve sleeve 127 is connected to the second piston ring 129 and penetrates the fixing bolt 128. The second piston ring 129 and the third piston ring 130 are usually made of corrosion-resistant and wear-resistant materials such as PP (polypropylene) or HDPE (high-density polyethylene), which can prevent the high-purity oxygen gas from leaking from the side of the valve sleeve 127. The fixing bolt 128 is connected by penetrating the third piston ring 130 and connected to the two sides of the second valve body 109. The third piston ring 130 can prevent the high-purity oxygen gas from leaking from the two sides of the second valve body 109.

[0035] In this embodiment, the fixing bolt 128 is used to prevent the valve sleeve 127 from loosening or falling off due to the pressure generated when discharging high-purity oxygen gas. The second piston ring 129 and the third piston ring 130 can prevent the high-purity oxygen gas from leaking from both sides of the valve sleeve 127 and the second valve body 109.

[0036] Fourth embodiment:

[0037] like Figure 2-3 As shown, the second flange 103 and the first flange 102 are provided at the lower end of the second valve body 109 , and the first flange 102 is connected to the high-purity oxygen inlet pipe 204 .

[0038] Fifth embodiment:

[0039] like Figure 2-3 , Figure 7As shown, first manual valves 107 are installed inside the second valve body 109 on both sides. When high-purity oxygen gas enters the second valve body 109, it can be rotated to open and transport and discharge through the first manual valve 107. The first manual valve 107 can prevent the high-purity oxygen gas from failing when the valve for discharging the gas fails, so that another valve can be opened for discharge. The first manual valve 107 is connected through a connecting arc ring 116. The connecting arc ring 116 is usually made of PP (polypropylene) or HDPE (high-density polyethylene) corrosion-resistant and wear-resistant materials, which can prevent the high-purity oxygen gas from entering the first manual valve 107 and leaking. One end of the connecting arc ring 116 is connected to the second valve body 109. The first manual valve 107 is connected to the second valve body 109. One end of 7 is connected and fixed to the first fixed disk 120 by welding, the first fixed disk 120 is connected and fixed to the second fixed disk 121 by bolts, the second fixed disk 121 is installed with an exhaust pipe 122, a blocking ball 133 is installed inside the first manual valve 107, a through hole 134 is opened inside the blocking ball 133, the blocking ball 133 can block the flow of high-purity oxygen gas, the through hole 134 is opened inside the blocking ball 133 to discharge high-purity oxygen gas, the blocking ball 133 is connected and fixed to the connecting column 132 by bolts, the connecting column 132 is connected and fixed to the rotating rod 118 by welding, the rotating rod 118 and the connecting column 132 pass through the inside of the guide sleeve column 119, and the upper end of the rotating rod 118 is connected and fixed to the rotating handle 117 by bolts.

[0040] When in use, firstly, the pure oxygen safety valve assembly 100 is opened, and the high-purity oxygen gas in the purified oxygen tank 201 is input into the interior of the air inlet pipe 204, and further transported from the exhaust pipe 122 to the interior of the high-purity oxygen storage tank 202. When the servo motor 106 is started, the threaded screw 110 is driven to rotate, and the movable valve block 111 is driven to move up and down, and then the connecting bolt 125 and the valve cover 126 are moved up and down, and the limit column 124 can block the moving spacing range of the valve cover 126. The lower end of the valve cover 126 is inserted into the valve sleeve 1 27, the through hole 134 is provided inside the valve cover 126, and the high purity oxygen gas flowing out of the valve sleeve 127 can be released or closed by moving. The high purity oxygen gas flows to the inside of the high purity oxygen steel pipe 131 through the gas delivery pipeline, and then flows out of the valve sleeve 127 from the inside of the high purity oxygen steel pipe 131. After that, the high purity oxygen is delivered to the inside of the high purity oxygen storage tank 202 from the exhaust pipe 122. The sensor 101 can be configured to detect an emergency such as leakage in the delivery of high purity oxygen gas, and can control the servo motor 106 to start the switch valve cover 126 to release high purity oxygen and close the delivery of high purity oxygen gas. The above embodiment is only one of the preferred embodiments of the utility model, and should not be used to limit the protection scope of the utility model. Any changes or modifications made on the main design concept and spirit of the utility model without any substantial meaning, and the technical problems solved by them are still consistent with the utility model, should be included in the protection scope of the utility model.

Claims

1. A device for purifying and preparing high-purity oxygen, characterized in that: include: A high-purity oxygen preparation mechanism (200) and a pure oxygen safety valve assembly (100), wherein the high-purity oxygen preparation mechanism (200) comprises a purified oxygen tank (201), one end of the purified oxygen tank (201) is connected and fixed to an air intake pipe (204) by bolts, the air intake pipe (204) is connected to the bottom end of the pure oxygen safety valve assembly (100) by bolts, one end of the pure oxygen safety valve assembly (100) is connected and fixed to an exhaust pipe (122) by bolts, the exhaust pipe (122) is connected to one end of a high-purity oxygen storage tank (202) by bolts, a support column (203) is fixedly mounted at the lower end of the pure oxygen safety valve assembly (100), and the pure oxygen safety valve assembly (100) comprises a servo motor (106), the lower end of the servo motor (106) is fixedly mounted to a first valve body (104), the first valve body (104) is fixedly mounted to the lower end of the servo motor (106), and the first valve body (104) is fixedly mounted to the lower end of the servo motor (106). 04) is provided with a threaded screw (110) inside and is installed on a servo motor (106), the threaded screw (110) passes through the inside of a movable valve block (111), a fixing column (113) is installed at the lower end of the movable valve block (111), a bottom plate (114) is provided at the lower end of the movable valve block (111), a connecting bolt (125) is provided at the lower end of the movable valve block (111), the connecting bolt (125) passes through and is connected to the inside of a limiting column (124), a valve cover (126) is provided at the lower end of the connecting bolt (125), a valve sleeve (127) is provided at the lower end of the valve cover (126), and the valve sleeve (127) is installed at the upper end of a high-purity oxygen steel pipe (131), a second flange (103) is installed at the lower end of the first valve body (104), and a sensor (101) is provided at one side of the first valve body (104).

2. The device for purifying and preparing high-purity oxygen according to claim 1, characterized in that: A leakproof disc (105) is installed between the first valve body (104) and the servo motor (106); a first flange (102) is provided at the lower end of the second flange (103); a first piston ring (115) is provided inside the first flange (102) and is connected to the inside of the second flange (103); a connecting bolt (125) penetrates the inside of the first piston ring (115).

3. The device for purifying and preparing high-purity oxygen according to claim 2, characterized in that: A second valve body (109) is installed at the lower end of the second flange (103), and fixing bolts (128) are provided on both sides of the second valve body (109). The fixing bolts (128) are connected to both sides of the valve sleeve (127). A second piston ring (129) is provided at one end of the valve sleeve (127) and penetrates the fixing bolt (128). The fixing bolt (128) is connected to the third piston ring (130) through the fixing bolt (128) and is connected to both sides of the second valve body (109).

4. The device for purifying and preparing high-purity oxygen according to claim 3, characterized in that: A second flange (103) and a first flange (102) are provided at the lower end of the second valve body (109); the first flange (102) is connected to a high-purity oxygen inlet pipe (204).

5. The device for purifying and preparing high-purity oxygen according to claim 4, characterized in that: A first manual valve (107) is provided on both sides of the second valve body (109); the first manual valve (107) is connected to a connecting arc ring (116) through a through hole; one end of the connecting arc ring (116) is connected to the second valve body (109); a first fixed disk (120) is provided at one end of the first manual valve (107); the first fixed disk (120) is connected to a second fixed disk (121); and the second fixed disk (121) is provided with an exhaust pipe (122).

6. The device for purifying and preparing high-purity oxygen according to claim 5, characterized in that: A blocking ball (133) is provided inside the first manual valve (107), a through hole (134) is provided inside the blocking ball (133), a connecting column (132) is installed on the blocking ball (133), a rotating rod (118) is fixedly installed on the connecting column (132), the rotating rod (118) and the connecting column (132) pass through the inside of the guide sleeve column (119), and a rotating handle (117) is provided at the upper end of the rotating rod (118).

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